US20110000447A1 - Control valve - Google Patents
Control valve Download PDFInfo
- Publication number
- US20110000447A1 US20110000447A1 US12/593,628 US59362808A US2011000447A1 US 20110000447 A1 US20110000447 A1 US 20110000447A1 US 59362808 A US59362808 A US 59362808A US 2011000447 A1 US2011000447 A1 US 2011000447A1
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- US
- United States
- Prior art keywords
- control piston
- closing element
- control
- orifice
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
Definitions
- the invention relates to a control valve, in particular for a device for varying the control times of an internal combustion engine, with an essentially hollow-cylindrically designed valve housing, an axially displaceable control piston arranged inside the valve housing, and a closing element, the control piston having at least one portion of hollow design which issues into an orifice of the control piston, and the closing element being arranged in the orifice.
- the invention relates, further, to a method for producing a control valve, in particular for a device for varying the control times of an internal combustion engine, with an essentially hollow-cylindrically designed valve housing, an axially displaceable control piston arranged inside the valve housing, and a closing element, the control piston having at least one portion of hollow design which issues into an orifice of the control piston.
- Control valves of this type are used in order to control pressure medium streams in hydraulic devices, for example hydraulic devices for varying the control times of an internal combustion engine (camshaft adjusters).
- a control valve of this type and a camshaft adjuster are known, for example, from DE 10 2004 038 252 A1.
- the camshaft adjuster has two components rotatable in relation to one another and two pressure chambers acting counter to one another, the relative phase of the two components being capable of being selectively varied or changed by the pressure chambers being loaded with or relieved of pressure in a directed manner.
- control of the pressure medium streams to and from the pressure chambers takes place by means of a control valve, in this case a 4/3-way proportional valve.
- a control valve in this case a 4/3-way proportional valve.
- Other types of directional valves may also be envisaged, however, in particular with different numbers of connections and/or control positions.
- the control valve consists essentially of an electromagnetic actuating drive, of a hollow-cylindrically designed valve housing and of a likewise essentially hollow-cylindrically designed axially displaceable control piston arranged inside the valve housing.
- the valve housing is provided in each case with a connection for the pressure chambers (working connection), with a connection to the pressure medium pump and with at least one connection to a tank.
- the control piston can be brought axially into any position between two defined end positions, counter to the spring force of a spring element, by means of an electromagnetic actuating member.
- the control piston is provided, furthermore, with annular grooves and control edges, with the result that the individual pressure chambers can be connected selectively to the pressure medium pump or to the tank.
- a position of the control piston may likewise be provided in which the pressure medium chambers are separated both from the pressure medium pump and from the pressure medium tank.
- the control piston can be displaced into any desired position inside the valve housing by means of the actuating drive which acts counter to a spring element.
- an axial orifice of the control piston which stands opposite the actuating drive, is closed, tight to pressure medium, by means of a closing element.
- a tappet rod movable linearly by the actuating drive acts on this closing element.
- the closing element is connected to the control piston by means of a nonpositive connection, for example by the closing element being pressed with oversize into the orifice of the control piston.
- the object on which the invention is based is to avoid these outlined disadvantages and therefore to provide a hydraulic control valve, in which, in particular, a deterioration in the performance and regulating accuracy of the control valve during operation is to be prevented.
- this object is achieved, according to the invention, in that the closing element has a circumferential wall which is adapted essentially to an inner surface area of the control piston in the region of the orifice, the circumferential wall having at least one material receptacle of smaller outside diameter, the material receptacle being followed in the axial direction of the closing element by a region of larger outside diameter on the side facing away from the orifice, and the inner surface area of the control piston engaging into the material receptacle.
- the material receptacle may be designed as an annular groove proceeding in the circumferential direction of the closing element.
- the material receptacle may be designed as a pocket.
- the material receptacle is designed as a chamfer of a circumferential edge of an axial sidewall of the closing element.
- the outside diameter of the control piston is made smaller in the region of the material receptacle than a maximum outside diameter of the control piston.
- the object is achieved, according to the invention, in that the closing element is connected to the control piston by means of a materially integral connection, an adhesive bond, a soldered joint or a welded joint.
- the object is by means of a method according to the invention having the following steps:
- control piston there may be provision for the material of the control piston to be displaced radially inward by means of radial embossing, radial circumferential calking or radial segmental calking of the control piston.
- control piston there may be provision for the material of the control piston to be displaced radially inward by means of axial embossing, axial annular calking or axial segmental calking of an axial side face of the control piston.
- the material may be displaced into at least one material receptacle formed on a circumferential face of the closing element.
- a control piston is arranged axially displaceably inside an essentially hollow-cylindrically designed valve housing.
- the control piston is of hollow design at least in one portion, this portion ending in an orifice of the control piston.
- the orifice may be formed on an axial side face of the control piston.
- control piston in addition to this orifice, further orifices, in particular radial bores, may be provided, via which the portion of hollow design of the control piston communicates, for example, with a pressure medium pump or with working connections or, via these, with a consumer.
- the control piston may, for example, be designed as an essentially hollow-cylindrical structural element or may have a U-shaped design in longitudinal section.
- a closing element is arranged inside the orifice.
- the closing element may, for example, be of cylindrical or pot-shaped design and serve, for example, for closing the orifice tight to pressure medium. Furthermore, there may be provision for the closing element to serve as a bearing element for a tappet rod, via which an actuating movement of an actuating member can be transmitted to the control piston.
- a nonpositive connection between the closing element and the control element This may be implemented, for example, by pressing the closing element designed with oversize into the orifice.
- displacing material of the control piston radially inward after the positioning of the closing element inside the orifice This may be implemented, for example, by means of the radial embossing, radial circumferential calking or radial segmental calking or by means of the axial embossing, axial annular calking or axial segmental calking of an axial side face of the control piston radially inward.
- the circumferential wall of the closing element may have at least one material receptacle of smaller outside diameter, the inner surface area of the control piston engaging into the material receptacle.
- the material receptacle may be followed in the axial direction by a region of the closing element, the outside diameter of which is designed to be larger than the outside diameter in the region of the material receptacle.
- a materially integral connection, an adhesive bond, a soldered joint or a welded joint may be provided between the closing element and the control piston.
- the material displacements may take place along the entire circumference of the control piston or only segmentally.
- FIG. 1 shows a longitudinal section through a device for varying the control times of an internal combustion engine, together with a pressure medium circuit
- FIG. 2 shows a cross section through the device illustrated in FIG. 1 ;
- FIG. 3 shows a longitudinal section through a control valve according to the invention
- FIG. 4 a shows a longitudinal section through a first embodiment of a control piston of a control valve according to the invention
- FIG. 4 b shows a perspective view of the control piston from FIG. 4 a;
- FIG. 5 a shows a cross section through a second embodiment of a control piston of a control valve according to the invention.
- FIG. 5 b shows a longitudinal section through the control piston from FIG. 5 a along the line A-A.
- FIGS. 1 and 2 show a device 1 for varying the control times of an internal combustion engine.
- the device 1 consists essentially of a stator 2 and of a rotor 3 arranged concentrically thereto.
- a drive wheel 4 is connected fixedly in terms of rotation to the stator 2 and, in the embodiment illustrated, is designed as a chain wheel.
- the stator 2 is mounted rotatably on the rotor 3 , in the embodiment illustrated five recesses 5 spaced apart in the circumferential direction being provided on the inner surface area of the stator 2 .
- the recesses 5 are delimited in the radial direction by the stator 2 and the rotor 3 , in the circumferential direction by two sidewalls 6 of the stator 2 and in the axial direction by a first and a second side cover 7 , 8 . Each of the recesses 5 is closed, pressure-tight, in this way.
- Vane grooves 10 proceeding axially are formed on the outer surface area of the rotor 3 , a radially extending vane 11 being arranged in each vane groove 10 .
- a vane 11 extends into each recess 5 , the vanes 11 bearing in the radial direction against the stator 2 and in the axial direction against the side covers 7 , 8 .
- Each vane 11 subdivides a recess 5 into two pressure chambers 12 , 13 acting counter to one another.
- first and second pressure medium lines 16 , 17 the first and second pressure chambers 12 , 13 can be connected via a control valve 18 to a pressure medium pump 19 or to a tank 20 .
- An actuating drive is thereby formed which allows a relative rotation of the stator 2 with respect to the rotor 3 .
- the first pressure chambers 12 When the first pressure chambers 12 are connected to the pressure medium pump 19 and the second pressure chambers 13 to the tank 20 , the first pressure chambers 12 expand at the expense of the second pressure chambers 13 .
- the rotor 3 is rotated with respect to the stator 2 .
- the pressure medium lines 16 , 17 are designed as essentially radially arranged bores which extend from a central bore 22 of the rotor 3 to the outer surface area of the latter.
- a central valve not illustrated, may be arranged, via which the pressure chambers 12 , 13 can be connected to the pressure medium pump 19 or to the tank 20 in a directed manner.
- a further possibility is to arrange inside the central bore 22 a pressure medium distributor which connects the pressure medium lines 16 , 17 to the connections of an externally mounted control valve 18 via pressure medium ducts and annular grooves.
- FIG. 3 illustrates a control valve 18 according to the invention in longitudinal section.
- An essentially hollow-cylindrically designed valve housing 34 is designed with a radial pressure medium connection P, with a radial tank connection T 1 , with two working connections A, B and with an axial tank connection T 2 .
- the radial connections P, T 1 , A, B are designed as first annular grooves 35 which are spaced axially apart from one another and which are formed on the outer surface area of the valve housing 34 .
- the first annular grooves 35 are provided with a plurality of first bores 36 which issue into the interior of the valve housing 34 .
- a likewise essentially hollow-cylindrically designed control piston 37 is arranged axially displaceably inside the valve housing 34 .
- One axial end of the control piston 37 is delimited, pressure-tight, by means of a wall portion 37 a .
- a closing element 39 is arranged in an orifice 37 b , lying opposite the wall portion 37 a , of the control piston 37 .
- the closing element 39 is designed in such a way that it closes the orifice 37 b pressure-tight.
- the control piston 37 can be brought into and held in any desired position within two extreme values, counter to the spring force of a spring element 33 , by means of a tappet rod 32 a .
- the tappet rod 32 a of the actuating member 32 bears against the closing element 39 . Linear actuating movements of the actuating member 32 are thus transmitted via the tappet rod 32 a to the closing element 39 and therefore to the control piston 37 .
- the outer surface area of the control piston 37 is provided with three axially spaced-apart second annular grooves 38 .
- the two outer annular grooves 38 communicate via second bores 41 with the interior of the control piston 37 .
- pressure medium can be conducted from the pressure medium connection P to the first or second working connections A, B as a function of the position of the control piston 37 inside the valve housing 34 , the interior of the control piston 37 being connected to the pressure medium connection P in any position.
- pressure medium can pass from the second working connection B via the middle annular groove 38 to the radial tank connection T 1 and from the first working connection A to the axial tank connection T 2 .
- pressure medium can be conducted to specific pressure chambers 12 , 13 and be discharged from the other pressure chambers 12 , 13 , thus leading to a relative change in the phase position between the rotor 3 and stator 2 and, consequently, between the crankshaft and camshaft.
- the connection between the control piston 37 and the closing element 39 is to be strengthened. This may be achieved, for example, by means of a positive and/or materially integral connection and/or a strengthening of the nonpositive connection. Adhesive bonds or combinations of these types of connection may likewise be envisaged.
- FIGS. 4 a and 4 b show a first embodiment according to the invention of a control piston 37 .
- the closing element 39 is of pot-shaped design, a cylindrical circumferential wall 39 a of the closing element 39 coming to bear against the inner surface area 37 d of the orifice 37 b .
- material 37 c of the control piston 37 is displaced radially inward in the region of the cylindrical circumferential wall 39 a .
- This may take place, for example, by means of radial embossing or calking.
- the material displacement may take place along the entire circumference of the control piston 37 in the form of an annular groove or segmentally, as illustrated in the embodiment. This leads to a reinforcement of the nonpositive connection between the control piston 37 and closing element 39 .
- the flowing material can be received on the inner surface area 37 d of the control piston 37 .
- the outside diameter of the control piston 37 may become slightly larger at the margins of the pressure-loaded region.
- FIGS. 5 a and 5 b show a second embodiment according to the invention of a control piston 37 .
- material 37 c of the control piston 37 is displaced radially inward.
- this takes place by axial embossing by means of annular or segmental calking.
- the tool is pressed into the axial side face (annular wall 37 e ) of the control piston 37 .
- the nonpositive connection between the closing element 39 and the control piston 37 is increased, and a positive connection occurs in the creeping direction, and therefore the relative position of the closing element 39 with respect to the control piston 37 is secured.
- material receptacles 40 may be provided here, too.
- the material receptacle 40 is implemented by means of a suitably dimensioned phase 40 a or a suitably dimensioned radius of the orifice-side bottom of the closing element 39 .
- both the chamfer 40 a and the material displacement may extend over the entire outer circumference of the bottom or may be formed only segmentally.
- a cylindrical closing element 39 may be provided.
Abstract
Description
- The invention relates to a control valve, in particular for a device for varying the control times of an internal combustion engine, with an essentially hollow-cylindrically designed valve housing, an axially displaceable control piston arranged inside the valve housing, and a closing element, the control piston having at least one portion of hollow design which issues into an orifice of the control piston, and the closing element being arranged in the orifice.
- The invention relates, further, to a method for producing a control valve, in particular for a device for varying the control times of an internal combustion engine, with an essentially hollow-cylindrically designed valve housing, an axially displaceable control piston arranged inside the valve housing, and a closing element, the control piston having at least one portion of hollow design which issues into an orifice of the control piston.
- Control valves of this type are used in order to control pressure medium streams in hydraulic devices, for example hydraulic devices for varying the control times of an internal combustion engine (camshaft adjusters).
- A control valve of this type and a camshaft adjuster are known, for example, from
DE 10 2004 038 252 A1. The camshaft adjuster has two components rotatable in relation to one another and two pressure chambers acting counter to one another, the relative phase of the two components being capable of being selectively varied or changed by the pressure chambers being loaded with or relieved of pressure in a directed manner. - The control of the pressure medium streams to and from the pressure chambers takes place by means of a control valve, in this case a 4/3-way proportional valve. Other types of directional valves may also be envisaged, however, in particular with different numbers of connections and/or control positions.
- The control valve consists essentially of an electromagnetic actuating drive, of a hollow-cylindrically designed valve housing and of a likewise essentially hollow-cylindrically designed axially displaceable control piston arranged inside the valve housing. The valve housing is provided in each case with a connection for the pressure chambers (working connection), with a connection to the pressure medium pump and with at least one connection to a tank.
- The control piston can be brought axially into any position between two defined end positions, counter to the spring force of a spring element, by means of an electromagnetic actuating member. The control piston is provided, furthermore, with annular grooves and control edges, with the result that the individual pressure chambers can be connected selectively to the pressure medium pump or to the tank. A position of the control piston may likewise be provided in which the pressure medium chambers are separated both from the pressure medium pump and from the pressure medium tank.
- The control piston can be displaced into any desired position inside the valve housing by means of the actuating drive which acts counter to a spring element. For this purpose, an axial orifice of the control piston, which stands opposite the actuating drive, is closed, tight to pressure medium, by means of a closing element. A tappet rod movable linearly by the actuating drive, acts on this closing element. The closing element is connected to the control piston by means of a nonpositive connection, for example by the closing element being pressed with oversize into the orifice of the control piston.
- In modern internal combustion engines, high alternating moments act upon the camshafts on account of the opening and closing movement of the gas exchange valves counter to the force of a valve spring. These alternating moments generate in the camshaft adjusters pressure peaks which may exceed 100 bar. These pressure peaks are transmitted to the control valve via the hydraulic system. There may then be the risk that, in the presence of high alternating moments and therefore high pressure peaks, the axial securing of the closing element in relation to the control piston is canceled and, for example, the closing element creeps out of the orifice.
- The result of this, on the one hand, may be that the full valve stroke of the control valve can no longer be utilized, the consequence of this being that the performance, in particular the adjustment speed, that camshaft adjusters is significantly impaired.
- On the other hand, the cancellation of the fixed axial relation of the closing element to the control piston leads to a situation where, in a specific position of the tappet rod, the expected position of the control piston in relation to the valve housing is not identical to the actual position, with the result that the regulation of the camshaft adjuster is seriously disrupted.
- The object on which the invention is based, therefore, is to avoid these outlined disadvantages and therefore to provide a hydraulic control valve, in which, in particular, a deterioration in the performance and regulating accuracy of the control valve during operation is to be prevented.
- In a first embodiment, this object is achieved, according to the invention, in that the closing element has a circumferential wall which is adapted essentially to an inner surface area of the control piston in the region of the orifice, the circumferential wall having at least one material receptacle of smaller outside diameter, the material receptacle being followed in the axial direction of the closing element by a region of larger outside diameter on the side facing away from the orifice, and the inner surface area of the control piston engaging into the material receptacle.
- In this case, there may be provision for the material receptacle to be designed as an annular groove proceeding in the circumferential direction of the closing element. Alternatively, the material receptacle may be designed as a pocket. Embodiments may likewise be envisaged in which the material receptacle is designed as a chamfer of a circumferential edge of an axial sidewall of the closing element.
- In a development of the invention, there is provision for the outside diameter of the control piston to be made smaller in the region of the material receptacle than a maximum outside diameter of the control piston.
- In addition, there may be provision for connecting the closing element (37 b) to the control piston (37) by means of a materially integral connection, an adhesive bond, a soldered joint or a welded joint.
- In a further embodiment, the object is achieved, according to the invention, in that the closing element is connected to the control piston by means of a materially integral connection, an adhesive bond, a soldered joint or a welded joint.
- The object is by means of a method according to the invention having the following steps:
-
- positioning of the closing element inside the orifice of the control piston,
- displacement of material of the control piston radially inward in the region of the closing element,
- solved.
- In this case, there may be provision for the material of the control piston to be displaced radially inward by means of radial embossing, radial circumferential calking or radial segmental calking of the control piston.
- Alternatively, there may be provision for the material of the control piston to be displaced radially inward by means of axial embossing, axial annular calking or axial segmental calking of an axial side face of the control piston.
- In a development of the method according to the invention, there may be provision for the material to be displaced into at least one material receptacle formed on a circumferential face of the closing element.
- In a control valve of this type, a control piston is arranged axially displaceably inside an essentially hollow-cylindrically designed valve housing. The control piston is of hollow design at least in one portion, this portion ending in an orifice of the control piston. In this case, there may be provision for the orifice to be formed on an axial side face of the control piston.
- In addition to this orifice, further orifices, in particular radial bores, may be provided, via which the portion of hollow design of the control piston communicates, for example, with a pressure medium pump or with working connections or, via these, with a consumer.
- The control piston may, for example, be designed as an essentially hollow-cylindrical structural element or may have a U-shaped design in longitudinal section.
- A closing element is arranged inside the orifice. The closing element may, for example, be of cylindrical or pot-shaped design and serve, for example, for closing the orifice tight to pressure medium. Furthermore, there may be provision for the closing element to serve as a bearing element for a tappet rod, via which an actuating movement of an actuating member can be transmitted to the control piston.
- In this case, there is provision for the radially outer circumferential wall of the closing element to be adapted to an inner surface area of the control piston in the region of the orifice.
- In order to increase the press-out forces of the closing element, there may be provision, on the one hand, for making a nonpositive connection between the closing element and the control element. This may be implemented, for example, by pressing the closing element designed with oversize into the orifice. In order to increase the nonpositive connection, there may be provision for displacing material of the control piston radially inward after the positioning of the closing element inside the orifice. This may be implemented, for example, by means of the radial embossing, radial circumferential calking or radial segmental calking or by means of the axial embossing, axial annular calking or axial segmental calking of an axial side face of the control piston radially inward.
- Additionally or alternatively to this, there may be provision for the circumferential wall of the closing element to have at least one material receptacle of smaller outside diameter, the inner surface area of the control piston engaging into the material receptacle. In this case, the material receptacle may be followed in the axial direction by a region of the closing element, the outside diameter of which is designed to be larger than the outside diameter in the region of the material receptacle. Thus, a positive connection is achieved, and the closing element is effectively prevented from creeping. In the event that the material receptacle is followed by the region of enlarged diameter on the side facing away from the orifice, this prevents the closing element from creeping out of the control piston. With an opposite configuration, a creeping of the closing element into the control piston, for example due to the action of force by a tappet rod acting on the closing element, can be prevented. It is likewise conceivable that the material receptacle is followed on both sides by regions of enlarged diameter, with the result that the closing element is secured in position by means of a positive connection.
- Additionally or alternatively to the abovementioned solutions, a materially integral connection, an adhesive bond, a soldered joint or a welded joint may be provided between the closing element and the control piston.
- While the material displacement is being carried out on the control piston, material build-ups may occur on the outer surface area of the control piston due to the engagement of tools. These build-ups, if they project beyond the maximum outside diameter of the control piston, may lead to a jamming of the control piston inside the valve housing. This is effectively counteracted by the control piston being designed in the region of the material receptacle with a smaller outside diameter than the maximum outside diameter of the control piston. Furthermore, the annular wall portion generated thereby at the interface between the regions of different outside diameter may be utilized as a stop for the material displacement tool.
- The material displacements may take place along the entire circumference of the control piston or only segmentally.
- Further features of the invention may be gathered from the following description and from the drawings which illustrate exemplary embodiments of the invention in a simplified form and in which:
-
FIG. 1 shows a longitudinal section through a device for varying the control times of an internal combustion engine, together with a pressure medium circuit; -
FIG. 2 shows a cross section through the device illustrated inFIG. 1 ; -
FIG. 3 shows a longitudinal section through a control valve according to the invention; -
FIG. 4 a shows a longitudinal section through a first embodiment of a control piston of a control valve according to the invention; -
FIG. 4 b shows a perspective view of the control piston fromFIG. 4 a; -
FIG. 5 a shows a cross section through a second embodiment of a control piston of a control valve according to the invention; and -
FIG. 5 b shows a longitudinal section through the control piston fromFIG. 5 a along the line A-A. -
FIGS. 1 and 2 show adevice 1 for varying the control times of an internal combustion engine. Thedevice 1 consists essentially of astator 2 and of arotor 3 arranged concentrically thereto. A drive wheel 4 is connected fixedly in terms of rotation to thestator 2 and, in the embodiment illustrated, is designed as a chain wheel. Thestator 2 is mounted rotatably on therotor 3, in the embodiment illustrated five recesses 5 spaced apart in the circumferential direction being provided on the inner surface area of thestator 2. The recesses 5 are delimited in the radial direction by thestator 2 and therotor 3, in the circumferential direction by two sidewalls 6 of thestator 2 and in the axial direction by a first and asecond side cover 7, 8. Each of the recesses 5 is closed, pressure-tight, in this way. -
Vane grooves 10 proceeding axially are formed on the outer surface area of therotor 3, aradially extending vane 11 being arranged in eachvane groove 10. Avane 11 extends into each recess 5, thevanes 11 bearing in the radial direction against thestator 2 and in the axial direction against the side covers 7, 8. Eachvane 11 subdivides a recess 5 into twopressure chambers - By means of first and second
pressure medium lines 16, 17, the first andsecond pressure chambers control valve 18 to a pressuremedium pump 19 or to atank 20. An actuating drive is thereby formed which allows a relative rotation of thestator 2 with respect to therotor 3. When thefirst pressure chambers 12 are connected to the pressuremedium pump 19 and thesecond pressure chambers 13 to thetank 20, thefirst pressure chambers 12 expand at the expense of thesecond pressure chambers 13. This results in a displacement of thevanes 11 in a circumferential direction, in the direction illustrated by thearrow 21. As a result of the displacement of thevanes 11, therotor 3 is rotated with respect to thestator 2. - The relative rotation of the
rotor 3 with respect to thestator 2 results in a phase displacement between the camshaft and crankshaft as a consequence of the supply or discharge of pressure medium to or from thepressure chambers pressure chambers - In the embodiment illustrated, the pressure
medium lines 16, 17 are designed as essentially radially arranged bores which extend from acentral bore 22 of therotor 3 to the outer surface area of the latter. Inside thecentral bore 22, a central valve, not illustrated, may be arranged, via which thepressure chambers medium pump 19 or to thetank 20 in a directed manner. A further possibility is to arrange inside the central bore 22 a pressure medium distributor which connects the pressuremedium lines 16, 17 to the connections of an externally mountedcontrol valve 18 via pressure medium ducts and annular grooves. -
FIG. 3 illustrates acontrol valve 18 according to the invention in longitudinal section. An essentially hollow-cylindrically designed valve housing 34 is designed with a radial pressure medium connection P, with a radial tank connection T1, with two working connections A, B and with an axial tank connection T2. The radial connections P, T1, A, B are designed as firstannular grooves 35 which are spaced axially apart from one another and which are formed on the outer surface area of the valve housing 34. The firstannular grooves 35 are provided with a plurality offirst bores 36 which issue into the interior of the valve housing 34. - A likewise essentially hollow-cylindrically designed
control piston 37 is arranged axially displaceably inside the valve housing 34. One axial end of thecontrol piston 37 is delimited, pressure-tight, by means of awall portion 37 a. A closingelement 39 is arranged in anorifice 37 b, lying opposite thewall portion 37 a, of thecontrol piston 37. The closingelement 39 is designed in such a way that it closes theorifice 37 b pressure-tight. - By means of an actuating
member 32, thecontrol piston 37 can be brought into and held in any desired position within two extreme values, counter to the spring force of aspring element 33, by means of atappet rod 32 a. For this purpose, thetappet rod 32 a of the actuatingmember 32 bears against the closingelement 39. Linear actuating movements of the actuatingmember 32 are thus transmitted via thetappet rod 32 a to theclosing element 39 and therefore to thecontrol piston 37. - The outer surface area of the
control piston 37 is provided with three axially spaced-apart secondannular grooves 38. The two outerannular grooves 38 communicate viasecond bores 41 with the interior of thecontrol piston 37. Via theannular grooves 38, the second bores 41 and the interior of thecontrol piston 37, pressure medium can be conducted from the pressure medium connection P to the first or second working connections A, B as a function of the position of thecontrol piston 37 inside the valve housing 34, the interior of thecontrol piston 37 being connected to the pressure medium connection P in any position. Likewise, in the case of specific positions of thecontrol piston 37 in relation to the valve housing 34, pressure medium can pass from the second working connection B via the middleannular groove 38 to the radial tank connection T1 and from the first working connection A to the axial tank connection T2. - Thus, by the position of the
control piston 37 inside the valve housing 34 being influenced in a directed manner, pressure medium can be conducted tospecific pressure chambers other pressure chambers rotor 3 andstator 2 and, consequently, between the crankshaft and camshaft. - Due to the pressure prevailing inside the
control piston 37, there may be the risk that theclosing element 39 creeps in the axial direction. This risk is due, above all, to the alternating moments acting on the camshaft and caused by the gas exchange valve springs, with the result that pressures above 100 bar may be induced in the hydraulic system. In order to prevent theclosing element 39 from creeping, in the embodiments according to the invention of acontrol valve 18, the connection between thecontrol piston 37 and theclosing element 39 is to be strengthened. This may be achieved, for example, by means of a positive and/or materially integral connection and/or a strengthening of the nonpositive connection. Adhesive bonds or combinations of these types of connection may likewise be envisaged. -
FIGS. 4 a and 4 b show a first embodiment according to the invention of acontrol piston 37. - In this embodiment, the closing
element 39 is of pot-shaped design, a cylindricalcircumferential wall 39 a of theclosing element 39 coming to bear against theinner surface area 37 d of theorifice 37 b. After the operation of pressing theclosing element 39 into theorifice 37 b of thecontrol piston 37,material 37 c of thecontrol piston 37 is displaced radially inward in the region of the cylindricalcircumferential wall 39 a. This may take place, for example, by means of radial embossing or calking. In this case, the material displacement may take place along the entire circumference of thecontrol piston 37 in the form of an annular groove or segmentally, as illustrated in the embodiment. This leads to a reinforcement of the nonpositive connection between thecontrol piston 37 and closingelement 39. - Additionally, so that the flowing material can be received on the
inner surface area 37 d of thecontrol piston 37, there may be provision for forming on theclosing element 39 one or morematerial receptacles 40, for example circumferential grooves or pockets, into which thematerial 37 c can be displaced. This gives rise to a positive connection between thecontrol piston 37 and theclosing element 39, with the result that the press-out forces are increased significantly. - During the material displacement operation, the outside diameter of the
control piston 37 may become slightly larger at the margins of the pressure-loaded region. In order to prevent this enlargement in diameter from leading to a jamming of thecontrol piston 37 inside the valve housing 34, there is provision for making the outside diameter of thecontrol piston 37 smaller in the region of the material displacement than the maximum outside diameter of thecontrol piston 37, in particular smaller than the inside diameter of the valve housing 34. -
FIGS. 5 a and 5 b show a second embodiment according to the invention of acontrol piston 37. In this exemplary embodiment, too, after theclosing element 39 has been positioned inside thecontrol piston 37, for example by means of an operation to press the closingelement 39 with oversize into theorifice 37 b of thecontrol piston 37,material 37 c of thecontrol piston 37 is displaced radially inward. In contrast to the first embodiment, this takes place by axial embossing by means of annular or segmental calking. In this case, the tool is pressed into the axial side face (annular wall 37 e) of thecontrol piston 37. As a result, the nonpositive connection between the closingelement 39 and thecontrol piston 37 is increased, and a positive connection occurs in the creeping direction, and therefore the relative position of theclosing element 39 with respect to thecontrol piston 37 is secured. - In order to absorb the material build-up which occurs,
material receptacles 40 may be provided here, too. In the exemplary embodiment, thematerial receptacle 40 is implemented by means of a suitably dimensionedphase 40 a or a suitably dimensioned radius of the orifice-side bottom of theclosing element 39. In this case, both thechamfer 40 a and the material displacement may extend over the entire outer circumference of the bottom or may be formed only segmentally. - Alternatively to the pot-shaped embodiment of the
closing element 39, as illustrated, other embodiments, for example acylindrical closing element 39, may be provided. - Alternatively, there may be provision for connecting the
closing element 39 to thecontrol piston 37 by means of an adhesive bond or a soldered or welded joint. Combinations of the first and the second embodiment with an adhesive bond or soldered or welded joint may likewise be envisaged. -
- 1 Device
- 2 Stator
- 3 Rotor
- 4 Drive wheel
- 5 Recesses
- 6 Sidewall
- 7 First side cover
- 8 Second side cover
- 10 Vane groove
- 11 Vane
- 12 First pressure chamber
- 13 Second pressure chamber
- 16 First pressure medium line
- 17 Second pressure medium line
- 18 Control valve
- 19 Pressure medium pump
- 20 Tank
- 21 Arrow
- 22 Central bore
- 31 Pressure medium circuit
- 32 Actuating member
- 32 a Tappet rod
- 33 Spring element
- 34 Valve housing
- 35 First annular groove
- 36 First bores
- 37 Control piston
- 37 a Wall portion
- 37 b Orifice
- 37 c Material
- 37 d Inner surface area
- 37 e Annular wall
- 38 Second annular groove
- 39 Closing element
- 39 a Circumferential wall
- 40 Material receptacle
- 40 a Chamfer
- 41 Second bore
- P Pressure medium connection
- T1 Radial tank connection
- T2 Axial tank connection
- A First working connection
Claims (11)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007015333.5A DE102007015333B4 (en) | 2007-03-30 | 2007-03-30 | Control valve and manufacturing method for the control valve |
DE102007015333.5 | 2007-03-30 | ||
PCT/EP2008/051775 WO2008119591A1 (en) | 2007-03-30 | 2008-02-14 | Control valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110000447A1 true US20110000447A1 (en) | 2011-01-06 |
Family
ID=39414930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/593,628 Abandoned US20110000447A1 (en) | 2007-03-30 | 2008-02-14 | Control valve |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110000447A1 (en) |
EP (1) | EP2142766A1 (en) |
CN (1) | CN101652537B (en) |
DE (1) | DE102007015333B4 (en) |
WO (1) | WO2008119591A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110017319A1 (en) * | 2009-07-24 | 2011-01-27 | Zhejiang Sanhua Climate And Appliance Controls Group Co., Ltd | End cover and four-way reversing valve using the same and assembling method thereof |
US20150053156A1 (en) * | 2013-08-22 | 2015-02-26 | Denso Corporation | Valve timing control apparatus |
US9822899B2 (en) | 2013-05-28 | 2017-11-21 | Schaeffler Technologies AG & Co. KG | Arrangement of an electromagnet for controlling a central valve |
US9915355B2 (en) | 2015-10-06 | 2018-03-13 | Caterpillar Inc. | Valve having open-center spool with separated inserts |
US10072765B2 (en) | 2015-07-02 | 2018-09-11 | Caterpillar Inc. | Valve having spool assembly with insert divider |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014212991A1 (en) * | 2014-07-04 | 2016-01-07 | Schaeffler Technologies AG & Co. KG | Control valve piston made of plastic |
DE102015224656A1 (en) | 2015-12-09 | 2017-06-14 | Schaeffler Technologies AG & Co. KG | Control valve for a camshaft adjuster with hollow control piston |
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-
2008
- 2008-02-14 CN CN2008800099541A patent/CN101652537B/en active Active
- 2008-02-14 EP EP08716844A patent/EP2142766A1/en not_active Ceased
- 2008-02-14 US US12/593,628 patent/US20110000447A1/en not_active Abandoned
- 2008-02-14 WO PCT/EP2008/051775 patent/WO2008119591A1/en active Application Filing
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US20110017319A1 (en) * | 2009-07-24 | 2011-01-27 | Zhejiang Sanhua Climate And Appliance Controls Group Co., Ltd | End cover and four-way reversing valve using the same and assembling method thereof |
US8770225B2 (en) | 2009-07-24 | 2014-07-08 | Zhejiang Sanhua Climate And Appliance Controls Group Co., Ltd | End cover and four-way reversing valve using the same and assembling method thereof |
US9822899B2 (en) | 2013-05-28 | 2017-11-21 | Schaeffler Technologies AG & Co. KG | Arrangement of an electromagnet for controlling a central valve |
US20150053156A1 (en) * | 2013-08-22 | 2015-02-26 | Denso Corporation | Valve timing control apparatus |
US9528400B2 (en) * | 2013-08-22 | 2016-12-27 | Denso Corporation | Valve timing control apparatus |
US10072765B2 (en) | 2015-07-02 | 2018-09-11 | Caterpillar Inc. | Valve having spool assembly with insert divider |
US9915355B2 (en) | 2015-10-06 | 2018-03-13 | Caterpillar Inc. | Valve having open-center spool with separated inserts |
Also Published As
Publication number | Publication date |
---|---|
DE102007015333B4 (en) | 2020-08-27 |
WO2008119591A1 (en) | 2008-10-09 |
CN101652537A (en) | 2010-02-17 |
DE102007015333A1 (en) | 2008-10-02 |
EP2142766A1 (en) | 2010-01-13 |
CN101652537B (en) | 2012-06-13 |
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