US20150110656A1 - Hydraulic piston pump having distribution through a bi-directional port plate - Google Patents
Hydraulic piston pump having distribution through a bi-directional port plate Download PDFInfo
- Publication number
- US20150110656A1 US20150110656A1 US14/520,908 US201414520908A US2015110656A1 US 20150110656 A1 US20150110656 A1 US 20150110656A1 US 201414520908 A US201414520908 A US 201414520908A US 2015110656 A1 US2015110656 A1 US 2015110656A1
- Authority
- US
- United States
- Prior art keywords
- casing
- pump
- suction
- delivery
- inner space
- 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
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2042—Valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F03C1/0639—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
- F03C1/0642—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons inclined on main shaft axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/08—Distributing valve-gear peculiar thereto
- F03C1/14—Distributing valve-gear peculiar thereto by driving liquid of engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/22—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
- F04B1/24—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons inclined to the main shaft axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/04—Draining
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Details Of Reciprocating Pumps (AREA)
- Rotary Pumps (AREA)
Abstract
A hydraulic pump having a plurality of pistons sliding in bores formed in a barrel mounted in rotation in a casing of the pump, the barrel bearing against a distribution port plate borne by a cylinder head. Two drainage channels place an inner space of the casing in respective communication with two suction/delivery orifices of the cylinder head. Each drainage channel is provided with a valve able to close the drainage channel in response to an overpressure in the suction/delivery orifice such that, according to the direction of rotation of the pump, the inner space of the casing is in communication through one of the drainage channels with the suction line; whereas the communication through the other drainage channel between the delivery side and the inner space of the casing is closed.
Description
- This application claims priority to Patent Application No. 1360278 filed Oct. 22, 2013 in France, the disclosure of which is incorporated herein by reference and to which priority is claimed.
- The present invention relates to a hydraulic piston pump and more particularly a hydraulic piston pump in which distribution takes place by means of a port plate.
- To allow a piston pump having distribution through a port plate to be able to rotate either to the right or to the left, it is necessary to construct this pump, on the one hand, by designing a symmetrical distribution port plate such that the delivery zone of the pump can become a suction zone and vice versa and, on the other hand, by incorporating orifices in the pump which can receive either a suction connection or a delivery connection.
- According to the direction of rotation of the pump, each of the two orifices of the pump will become either a suction orifice or a delivery orifice.
- In such an arrangement, the leaks of the distribution port plate on the delivery side of the pump, which is the pressure side, will be collected by the casing of the pump.
- To evacuate these leaks, it is necessary to provide a connection of the casing of the pump toward the supply reservoir of the pump by installing a drainage circuit.
- This need to have a drainage circuit is a disadvantage.
- FR-A-2988143 describes a hydraulic motor with internal drainage. The hydraulic motor has a drainage orifice communicating with an inner space of the casing of the motor, an intermediate pipe into which the drainage orifice of the casing opens, a first nonreturn valve arranged between the intermediate pipe and a first bi-directional hydraulic port and able to open under the effect of a positive pressure differential between the intermediate pipe and the first bi-directional hydraulic port, and a second nonreturn valve arranged between the intermediate pipe and a second bi-directional hydraulic port and able to open under the effect of a positive pressure differential between the intermediate pipe and the second bi-directional hydraulic port. Such an arrangement makes it possible for the liquid arising from the internal leaks of the motor to be evacuated from the casing through the one of the two nonreturn valves which is connected to the return port of the motor. In this device, the valves are closed by default.
- The object of the present invention is to produce a piston pump which can rotate either to the right or to the left without having to put in place a specific pump drainage circuit.
- To achieve this aim, the pump according to the present invention has a plurality of pistons sliding in bores formed in a barrel mounted in rotation in a casing of the pump, said barrel bearing against a distribution port plate borne by a cylinder head, said distribution port plate being provided with two symmetrical crescents serving alternately as a suction crescent and a delivery crescent according to the direction of rotation of the pump, and is characterized in that the cylinder head is provided with two drainage channels placing an inner space of the casing in respective communication with two suction/delivery orifices of said cylinder head; each drainage channel being provided with a valve able to close the drainage channel in response to an overpressure in the suction/delivery orifice such that, according to the direction of rotation of the pump, the inner space of the casing is in communication through one of the drainage channels with the suction line; whereas the communication through the other drainage channel between the delivery side and the inner space of the casing is closed.
- According to one embodiment, the valve has in each case a compression spring housed in the drainage channel so as to maintain the valve in an open position by default.
- The invention will be better understood, and other aims, details, features and advantages thereof will become more clearly apparent during the following description of a number of particular embodiments of the invention given purely by way of nonlimiting illustrative example with reference to the appended drawings.
- In these drawings:
-
FIG. 1 is a view in longitudinal section of a known type of hydraulic piston pump. -
FIG. 2 is a view in section on line D-D ofFIG. 1 . -
FIG. 3 is a perspective view of the pump ofFIG. 1 rotating to the right. -
FIG. 4 is a perspective view of the pump ofFIG. 1 rotating to the left. -
FIG. 5 is a partial view, in longitudinal section, illustrating the operation of the suction zone of the pump according to the invention. -
FIG. 6 is a partial view, in longitudinal section, illustrating the operation of the delivery zone of the pump according to the invention. -
FIG. 1 shows a hydraulic piston pump having adrive shaft 1 provided with aplate 2 against which there bear a plurality ofpistons 3 which slide in bores 4 formed in abarrel 5 housed in acasing 6 provided with adrainage orifice 8 closed by a cap. Thebarrel 5 bears against adistribution port plate 7 borne by acylinder head 9. - In
FIG. 2 , which is a view in section on D-D ofFIG. 1 , it can be seen that, in a known way, thedistribution port plate 7 has twocrescents shaft 1, these crescents will serve alternately for suction or for delivery. -
FIG. 3 shows the position of the suction pipe A when thedrive shaft 1 is rotating to the right (or clockwise direction). -
FIG. 4 shows the position of this suction pipe A when the drive shaft is rotating to the left (or counter clockwise direction). - A delivery line B, not shown in
FIGS. 3 and 4 , is connected to the other orifice of thecylinder head 9. - During the operation of the pump, hydraulic liquid leaks occur on the delivery side of the pump. These leaks are collected in the
casing 6 and will be evacuated through thedrainage orifice 8, which can be connected to a drainage circuit to return the liquid arising from the leaks to the reservoir. - One aim of the present invention is to dispense with this drainage circuit.
- To achieve this aim, the
cylinder head 9 is provided with twononreturn valves 12 communicating with the suction/delivery orifices 20. - The effect of these two
valves 12 is: -
- on the one hand, to allow the
inner space 17 of thecasing 6 to communicate freely through one of thevalves 12 with thesuction orifice 20 and the suction line A, as is illustrated inFIG. 5 , thereby placing theinner space 17 of thecasing 6 in connection with the suction side of the pump and implementing the drainage of the pump; - on the other hand, closing, through the
other valve 12, the communication of thedelivery orifice 20 with theinner space 17 of thecasing 6, as is illustrated inFIG. 6 .
- on the one hand, to allow the
- More precisely, the nonreturn valve has a
helical spring 13, aball 12 serving as a valve, and achannel 14 formed in thecylinder head 9 so as to connect in each case the suction/delivery orifice 20 to theinner space 17 of thecasing 6 of the pump. Thechannel 14 opens into thecasing 6 in line with a peripheral portion of thedistribution port plate 7 which has a fluid passage toward theinner space 17 of thecasing 6. - The
spring 13 is housed in a wide section of thechannel 14, bearing between a shoulder of thechannel 14 on the casing side and theball 12 on the cylinder head side. By default, thespring 13 maintains theball 12 at a distance from avalve seat 18 surrounding the inlet of thechannel 14. Thus, thechannel 14 is open unless there is an overpressure in the suction/delivery orifice 20 with respect to theinner space 17, which is normally at atmospheric pressure. Thevalve 12 is therefore a valve which is open by default and which closes thechannel 14 in response to an overpressure in the suction/delivery orifice 20 of the cylinder head. - Although the invention has been described in conjunction with a number of particular embodiments, it is clearly obvious that it is in no way limited thereto and that it encompasses all the technical equivalents of the means described and combinations thereof where these fall within the scope of the invention.
- The use of the verb “have”, “comprise” or “include” and its conjugated forms does not exclude the presence of elements or steps other than those stated in a claim. Unless stated otherwise, the use of the indefinite article “a” for an element does not exclude the presence of a plurality of such elements.
- In the claims, any reference sign between parentheses should not be interpreted as a limitation of the claim.
Claims (1)
1. A hydraulic piston pump of the type having a plurality of pistons sliding in bores formed in a barrel mounted in rotation in a casing of the pump, said barrel bearing against a distribution port plate borne by a cylinder head, said distribution port plate being provided with two symmetrical crescents serving alternately as a suction crescent and a delivery crescent according to the direction of rotation of the pump, in which the cylinder head is provided with two drainage channels placing an inner space of the casing in respective communication with two suction/delivery orifices of said cylinder head; each drainage channel being provided with a valve, wherein the valve has in each case a compression spring housed in the drainage channel so as to maintain the valve in an open position by default, the valve being able to close the drainage channel in response to an overpressure in the suction/delivery orifice such that, according to the direction of rotation of the pump, the inner space of the casing is in communication through one of the drainage channels with the suction line; whereas the communication through the other drainage channel between the delivery side and the inner space of the casing is closed.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1360278A FR3012181A1 (en) | 2013-10-22 | 2013-10-22 | HYDRAULIC PISTON PUMP WITH BI-DIRECTIONAL ICE DISTRIBUTION |
FR1360278 | 2013-10-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150110656A1 true US20150110656A1 (en) | 2015-04-23 |
Family
ID=49667491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/520,908 Abandoned US20150110656A1 (en) | 2013-10-22 | 2014-10-22 | Hydraulic piston pump having distribution through a bi-directional port plate |
Country Status (3)
Country | Link |
---|---|
US (1) | US20150110656A1 (en) |
EP (1) | EP2865892A1 (en) |
FR (1) | FR3012181A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105423104A (en) * | 2015-12-24 | 2016-03-23 | 衢州学院 | Self-pressurization hydro-hybrid lubricated port plate |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3075277B1 (en) | 2017-12-14 | 2021-10-08 | Hydro Leduc | HYDRAULIC PUMP WITH SERIES SPHERES |
Citations (40)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB955073A (en) * | 1959-08-11 | 1964-04-15 | Austin Motor Co Ltd | Improvements in hydraulic swash-plate pumps and motors |
GB1010608A (en) * | 1961-09-14 | 1965-11-24 | Sperry Rand Corp | Improvements in hydraulic motor or pump devices |
US3302585A (en) * | 1962-09-24 | 1967-02-07 | Abex Corp | Control for variable displacement pump or motor |
US3426686A (en) * | 1966-04-04 | 1969-02-11 | Ulrich Mfg Co | Pump |
US3776104A (en) * | 1971-06-22 | 1973-12-04 | J Oliver | Fluid operated positive displacement rotating energy converter |
US3862588A (en) * | 1969-07-31 | 1975-01-28 | Firm Of Constantin Rauch | Method of operating an axial piston machine having a hydrostatic bearing load relief device |
US3978772A (en) * | 1973-02-16 | 1976-09-07 | Aisin Seiki Kabushiki Kaisha | Piston shoe for fluid pressure pump motor |
US4137826A (en) * | 1977-07-28 | 1979-02-06 | Shimadzu Seisakushi, Ltd. | Piston pump |
US4212596A (en) * | 1978-02-23 | 1980-07-15 | Caterpillar Tractor Co. | Pressurized fluid supply system |
US4469012A (en) * | 1981-05-04 | 1984-09-04 | Poclain Hydraulics | Pressurized fluid mechanism comprising reaction rollers mounted on pistons |
US4486152A (en) * | 1979-11-26 | 1984-12-04 | Hydro Rene Leduc | Pump with spring loaded valve |
US4629400A (en) * | 1979-11-26 | 1986-12-16 | Hydro Rene Leduc | Hydraulic pump with pistons and controlled suction valves |
US4788902A (en) * | 1986-08-25 | 1988-12-06 | Hitachi Ltd. | Thrust hydrostatic bearing device for use in axial piston machine |
FR2657125A1 (en) * | 1990-01-12 | 1991-07-19 | Leduc Rene Hydro Sa | Improvements to hydraulic pumps with axial pistons and swash plate |
US5085127A (en) * | 1990-03-29 | 1992-02-04 | Sundstrand Corporation | Cavitation resistant hydraulic cylinder block porting faces |
US5182978A (en) * | 1988-10-03 | 1993-02-02 | Hitachi Construction Machinery Co., Ltd. | Bent axis type variable displacement hydraulic machine |
EP0558389A1 (en) * | 1992-02-28 | 1993-09-01 | Hydro Rene Leduc | Hydraulic piston pump with inlet valves |
FR2688034A1 (en) * | 1992-02-28 | 1993-09-03 | Leduc Rene Hydro Sa | Improvement to hydraulic pumps with pistons equipped with an intake valve |
US5318410A (en) * | 1991-10-16 | 1994-06-07 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable displacement compressor |
US5419130A (en) * | 1991-08-28 | 1995-05-30 | Hydromatik Gmbh | Hydrostatic machine with drain oil discharge |
US5567124A (en) * | 1992-12-21 | 1996-10-22 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable capacity swash-plate type compressor with an improved capacity control means |
US6068451A (en) * | 1999-01-28 | 2000-05-30 | Eaton Corporation | Hydraulic pump and wide band neutral arrangement therefor |
US6095766A (en) * | 1998-07-29 | 2000-08-01 | Brown; Albert W. | Fuel transfer pump |
US6102670A (en) * | 1997-09-05 | 2000-08-15 | Sanden Corporation | Apparatus and method for operating fluid displacement apparatus with variable displacement mechanism |
US6290468B1 (en) * | 1998-10-30 | 2001-09-18 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable displacement compressor |
US6705102B2 (en) * | 2001-10-15 | 2004-03-16 | Kabushiki Kaisha Toyota Jidoshokki | Vehicular air-conditioner |
US6725681B2 (en) * | 2001-11-27 | 2004-04-27 | Kabushiki Kaisha Toyota Jidoshokki | Air conditioner |
US20040101419A1 (en) * | 2002-11-22 | 2004-05-27 | Caterpillar Inc. | Axial piston pump with fluid bearing arrangement |
US20040194619A1 (en) * | 2003-04-01 | 2004-10-07 | Sampo-Hydraulics Oy | Radial piston hydraulic motor and method in the control of a radial piston hydraulic motor |
WO2005024191A2 (en) * | 2003-08-29 | 2005-03-17 | Hydro Leduc | Hydraulic control device for the opening of internal combustion engine valves |
FR2865779A1 (en) * | 2004-02-04 | 2005-08-05 | Hydro Leduc | Hydraulic control device for opening inlet and exhaust valves, has axial pump with pistons whose heads rest on respective skids that pass into lunule, such that pumped hydraulic fluid is kept in communication with accumulator |
US20050226747A1 (en) * | 2004-04-13 | 2005-10-13 | Ryota Ohashi | Hydraulic pump unit, hydraulic pump set, and working vehicle |
EP1887222A1 (en) * | 2006-07-26 | 2008-02-13 | Hydro Leduc | Improvement for radial piston pumps |
US20080236156A1 (en) * | 2007-03-30 | 2008-10-02 | Atsushi Kakino | Electro hydrostatic actuator with swash plate pump |
US7708531B2 (en) * | 2003-09-09 | 2010-05-04 | Kanzaki Kokyukoki Mfg. Co., Ltd. | Axial piston device |
FR2965311A1 (en) * | 2010-09-29 | 2012-03-30 | Hydro Leduc | HYDRAULIC DISTRIBUTION DEVICE USING A DOUBLE-SENSE PUMP WITH VARIABLE FLOW RATE |
FR2988143A1 (en) * | 2012-03-19 | 2013-09-20 | Hydro Leduc | HYDRAULIC MOTOR WITH INTERNAL DRAINAGE |
US20130336815A1 (en) * | 2012-06-14 | 2013-12-19 | Hydro Leduc | Hydraulic axial piston pump able to operate in both directions |
US20140003970A1 (en) * | 2012-06-28 | 2014-01-02 | Hydro Leduc | Axial pistons hydraulic pump able to function in one or the other rotating direction |
US20160025081A1 (en) * | 2013-04-04 | 2016-01-28 | Hydro Leduc | Hydraulic pump with double direction of rotation |
-
2013
- 2013-10-22 FR FR1360278A patent/FR3012181A1/en not_active Withdrawn
-
2014
- 2014-10-09 EP EP20140188250 patent/EP2865892A1/en not_active Withdrawn
- 2014-10-22 US US14/520,908 patent/US20150110656A1/en not_active Abandoned
Patent Citations (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB955073A (en) * | 1959-08-11 | 1964-04-15 | Austin Motor Co Ltd | Improvements in hydraulic swash-plate pumps and motors |
GB1010608A (en) * | 1961-09-14 | 1965-11-24 | Sperry Rand Corp | Improvements in hydraulic motor or pump devices |
US3302585A (en) * | 1962-09-24 | 1967-02-07 | Abex Corp | Control for variable displacement pump or motor |
US3426686A (en) * | 1966-04-04 | 1969-02-11 | Ulrich Mfg Co | Pump |
US3862588A (en) * | 1969-07-31 | 1975-01-28 | Firm Of Constantin Rauch | Method of operating an axial piston machine having a hydrostatic bearing load relief device |
US3776104A (en) * | 1971-06-22 | 1973-12-04 | J Oliver | Fluid operated positive displacement rotating energy converter |
US3978772A (en) * | 1973-02-16 | 1976-09-07 | Aisin Seiki Kabushiki Kaisha | Piston shoe for fluid pressure pump motor |
US4137826A (en) * | 1977-07-28 | 1979-02-06 | Shimadzu Seisakushi, Ltd. | Piston pump |
US4212596A (en) * | 1978-02-23 | 1980-07-15 | Caterpillar Tractor Co. | Pressurized fluid supply system |
US4486152A (en) * | 1979-11-26 | 1984-12-04 | Hydro Rene Leduc | Pump with spring loaded valve |
US4629400A (en) * | 1979-11-26 | 1986-12-16 | Hydro Rene Leduc | Hydraulic pump with pistons and controlled suction valves |
US4469012A (en) * | 1981-05-04 | 1984-09-04 | Poclain Hydraulics | Pressurized fluid mechanism comprising reaction rollers mounted on pistons |
US4788902A (en) * | 1986-08-25 | 1988-12-06 | Hitachi Ltd. | Thrust hydrostatic bearing device for use in axial piston machine |
US5182978A (en) * | 1988-10-03 | 1993-02-02 | Hitachi Construction Machinery Co., Ltd. | Bent axis type variable displacement hydraulic machine |
FR2657125A1 (en) * | 1990-01-12 | 1991-07-19 | Leduc Rene Hydro Sa | Improvements to hydraulic pumps with axial pistons and swash plate |
US5085127A (en) * | 1990-03-29 | 1992-02-04 | Sundstrand Corporation | Cavitation resistant hydraulic cylinder block porting faces |
US5419130A (en) * | 1991-08-28 | 1995-05-30 | Hydromatik Gmbh | Hydrostatic machine with drain oil discharge |
US5318410A (en) * | 1991-10-16 | 1994-06-07 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable displacement compressor |
EP0558389A1 (en) * | 1992-02-28 | 1993-09-01 | Hydro Rene Leduc | Hydraulic piston pump with inlet valves |
FR2688034A1 (en) * | 1992-02-28 | 1993-09-03 | Leduc Rene Hydro Sa | Improvement to hydraulic pumps with pistons equipped with an intake valve |
US5567124A (en) * | 1992-12-21 | 1996-10-22 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable capacity swash-plate type compressor with an improved capacity control means |
US6102670A (en) * | 1997-09-05 | 2000-08-15 | Sanden Corporation | Apparatus and method for operating fluid displacement apparatus with variable displacement mechanism |
US6095766A (en) * | 1998-07-29 | 2000-08-01 | Brown; Albert W. | Fuel transfer pump |
US6290468B1 (en) * | 1998-10-30 | 2001-09-18 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable displacement compressor |
US6068451A (en) * | 1999-01-28 | 2000-05-30 | Eaton Corporation | Hydraulic pump and wide band neutral arrangement therefor |
US6705102B2 (en) * | 2001-10-15 | 2004-03-16 | Kabushiki Kaisha Toyota Jidoshokki | Vehicular air-conditioner |
US6725681B2 (en) * | 2001-11-27 | 2004-04-27 | Kabushiki Kaisha Toyota Jidoshokki | Air conditioner |
US20040101419A1 (en) * | 2002-11-22 | 2004-05-27 | Caterpillar Inc. | Axial piston pump with fluid bearing arrangement |
US20040194619A1 (en) * | 2003-04-01 | 2004-10-07 | Sampo-Hydraulics Oy | Radial piston hydraulic motor and method in the control of a radial piston hydraulic motor |
WO2005024191A2 (en) * | 2003-08-29 | 2005-03-17 | Hydro Leduc | Hydraulic control device for the opening of internal combustion engine valves |
US7708531B2 (en) * | 2003-09-09 | 2010-05-04 | Kanzaki Kokyukoki Mfg. Co., Ltd. | Axial piston device |
FR2865779A1 (en) * | 2004-02-04 | 2005-08-05 | Hydro Leduc | Hydraulic control device for opening inlet and exhaust valves, has axial pump with pistons whose heads rest on respective skids that pass into lunule, such that pumped hydraulic fluid is kept in communication with accumulator |
US20050226747A1 (en) * | 2004-04-13 | 2005-10-13 | Ryota Ohashi | Hydraulic pump unit, hydraulic pump set, and working vehicle |
EP1887222A1 (en) * | 2006-07-26 | 2008-02-13 | Hydro Leduc | Improvement for radial piston pumps |
US20080236156A1 (en) * | 2007-03-30 | 2008-10-02 | Atsushi Kakino | Electro hydrostatic actuator with swash plate pump |
FR2965311A1 (en) * | 2010-09-29 | 2012-03-30 | Hydro Leduc | HYDRAULIC DISTRIBUTION DEVICE USING A DOUBLE-SENSE PUMP WITH VARIABLE FLOW RATE |
FR2988143A1 (en) * | 2012-03-19 | 2013-09-20 | Hydro Leduc | HYDRAULIC MOTOR WITH INTERNAL DRAINAGE |
US20150059326A1 (en) * | 2012-03-19 | 2015-03-05 | Hydro Leduc | Internally drained hydraulic motor |
US20130336815A1 (en) * | 2012-06-14 | 2013-12-19 | Hydro Leduc | Hydraulic axial piston pump able to operate in both directions |
US20140003970A1 (en) * | 2012-06-28 | 2014-01-02 | Hydro Leduc | Axial pistons hydraulic pump able to function in one or the other rotating direction |
US20160025081A1 (en) * | 2013-04-04 | 2016-01-28 | Hydro Leduc | Hydraulic pump with double direction of rotation |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105423104A (en) * | 2015-12-24 | 2016-03-23 | 衢州学院 | Self-pressurization hydro-hybrid lubricated port plate |
Also Published As
Publication number | Publication date |
---|---|
FR3012181A1 (en) | 2015-04-24 |
EP2865892A1 (en) | 2015-04-29 |
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Owner name: HYDRO LEDUC, FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:POREL, FRANCOIS;REEL/FRAME:034209/0076 Effective date: 20141113 |
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