CN100587437C - Pinking sensor - Google Patents
Pinking sensor Download PDFInfo
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- CN100587437C CN100587437C CN200610004147A CN200610004147A CN100587437C CN 100587437 C CN100587437 C CN 100587437C CN 200610004147 A CN200610004147 A CN 200610004147A CN 200610004147 A CN200610004147 A CN 200610004147A CN 100587437 C CN100587437 C CN 100587437C
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Abstract
A knock sensor 1 for attachment to an internal combustion engine. The knock sensor 1 includes a cap 41a and a support member 11 . At least a part of the top surface of the support member 11 is coveredby cap 41a to prevent a mounting bolt 91 from directly making contact with the top surface of the support member 11 when the mounting bolt 91 extends through a through-hole 71 in the sensor. The cap41a covers the top surface of the support member 11 to protect the support member from being ground or abraded by the mounting bolt 91.
Description
Technical field
The present invention relates to a kind of detonation sensor (knock sensor), it is used for surveying the pinking that produces at internal combustion engine.
Background technology
Detonation sensor is a kind of device that is used for surveying the pinking (knock) that produces at internal combustion engine.Usually, a detonation sensor utilizes a retaining element to be fixed on the mounting portion of an internal combustion engine, such retaining element such as bolt, this retaining element extends through the through hole that is formed on the support component, and this support component supports a piezoelectric element (sensor element just).
Publication number is that the Japanese patent application (kokai) of 2004-85255 discloses a kind of detonation sensor, this detonation sensor has the support component of being made by the material with less Young modulus, such material such as resin are so that improve the output of detonation sensor.
The problem of such detonation sensor is, described sensor is connected on the internal combustion engine, and the top surface of support component contacts with immobilization material (bolt) simultaneously, thus, when support component was connected with internal combustion engine, be fixed element (bolt) wearing and tearing of the top surface of described support component were promptly denuded.As a result, the detection performance of described detonation sensor is tended to change.Especially, when described support component was made by soft material with little Young modulus such as resin, described support component more may be subjected to the wearing and tearing or the abrasion of retaining element.
The invention solves the problems referred to above.An advantage of the invention is; detonation sensor is fixed on the internal combustion engine by described retaining element being extended through a through hole that is formed in the described support component; and described detonation sensor can protect described support component to make it not be subjected to the wearing and tearing of described retaining element.
Summary of the invention
First embodiment of the present invention that finishes above-mentioned purpose is a kind of like this detonation sensor, and it comprises: the support component with through hole; The piezoelectric element that supports by this support component, wherein, retaining element extend through described through hole and above described support component fastening described detonation sensor, and the bottom surface of described support component contacts with internal combustion engine; And covering element, this covering element is fixed on the described support component with irrotational form, thereby at least a portion of the top surface of described support component can be covered, wherein, when described retaining element extended through described through hole, this covering element can prevent that described retaining element from directly contacting with the top surface of described support component.
Therefore, a kind of like this detonation sensor can be protected the top surface of described support component that it is not is not worn and torn by described retaining element or denude, and this is because described covering element has wherein hidden the top surface of described support component.And, therefore because described covering element is fixed on the described support component with irrotational form, prevented that described covering element from sliding at described support component during by described retaining element fastening (tighten up) on described support component.Like this, equally also protected described support component that it is not denuded by described covering element.
In addition, described retaining element can be made of two independent elements: an element that extends through described through hole; And the element from the fastening described detonation sensor of top surface of described support component, perhaps, described retaining element can be made of its composition element.Recognize that equally described detonation sensor can comprise the covering element that is fixed on the described support component.
A kind of so described covering element of detonation sensor is fixed on the described support component, so that can not leave therefrom when described detonation sensor is fixed on the mounting portion of described internal combustion engine.As a result, the operability of the installation of described detonation sensor will be enhanced.
And described detonation sensor preferably has described covering element, and this element has hidden the whole top surface of described support component.A kind of like this detonation sensor will prevent that described retaining element from directly contacting with the top surface of described support component.And described support component can contact with described covering element level and smooth (even), and this has just caused described detonation sensor successfully to be installed on the described internal combustion engine.
Moreover in described detonation sensor, described covering element comprises: the column part that is the hollow column type that is limited by described through hole; And from the upside of the described column part flange portion to outer process, and this part preferably is set, thus the top surface that has hidden described support component made.
A kind of like this flange portion of detonation sensor has hidden the top surface of described support component, and can easily use described columnar portion to assign to locate.In addition,, enter in the through hole of described support component, therefore can easily realize the fixing of described covering element and support component in column part press fit described in this structure owing to adopted a kind of like this structure.
And in described detonation sensor, described covering element preferably has the Young modulus bigger than described support component.
A kind of like this covering element of detonation sensor can not be worn, and has therefore prevented that further the top surface of described support component from being worn and torn by described retaining element.
And in described detonation sensor, described covering element preferably is made of metal.
A kind of like this covering element of detonation sensor can obtain easily, equally also processing easily.
In addition, in described detonation sensor, described support component preferably is made of metal, and more preferably is formed from a resin.
In a kind of like this detonation sensor, usually, the weight ratio metal of described resin in light weight, thus make the weight of institute's detonation sensor reduce.
Equally, usually, the Young modulus of resin is littler than the metal.The degrees of expansion of described support component when described support component being formed from a resin improved vibration.For this reason, can increase loading element (weighting member) and be imposed to the load on the described piezoelectric element, the result can enlarge the output of described detonation sensor.
And when the detonation sensor with support component of being made by the material that is worn had easily adopted structure described in first embodiment of the present invention, described support component can not be worn.
And, in described detonation sensor, described covering element can comprise the hole on a plurality of parts that are formed on the top surface that has hidden described support component, and, described support component can comprise the jut on the top surface that is formed on described support component, thus so that engage with the described hole of described covering element.
In a kind of like this detonation sensor, the jut of described support component engages with the hole of described covering element, has guaranteed thus to prevent that described covering element from sliding at the top surface of described support component.
Description of drawings
Fig. 1 is a kind of front elevation of detonation sensor 1 of off-resonance type;
Fig. 2 is a cut-open view that shows the inner structure of described detonation sensor 1;
Fig. 3 A is the top view of a cap 41a;
Fig. 3 B is the front elevation of a cap 41a;
Fig. 3 C is the side view of a cap 41a;
Fig. 4 is a decomposition diagram that a part of assembly that provides in the described detonation sensor 1 is provided;
Fig. 5 is one and shows that erection bolt 91 inserts the partial sectional view of the state in the described detonation sensor 1;
Fig. 6 is a top view according to a detonation sensor 100 of a modification of the present invention;
Fig. 7 is the cut-open view of a demonstration according to the inner structure of the described detonation sensor 200 of a modification of the present invention;
Fig. 8 A is the top view of a cap 41b;
Fig. 8 B is a front elevation according to a cap 41b of a modification of the present invention.
Embodiment
One embodiment of the present of invention are described below with reference to the accompanying drawings.
At first, described according to a kind of off-resonance type detonation sensor 1 of the present invention (after this abbreviating detonation sensor 1 as) with reference to figure 1.Fig. 1 is a kind of front elevation of detonation sensor 1 of off-resonance type.
Described overcoat 61 comprises a column type housing parts 63 and a connector part 65, wherein, the upside of housing parts 63 (after this top side in Fig. 1 is referred to as upside) is tapered, and described connector part 65 is connected (as igniting timing control module) with an external device (ED).Described connector part 65 from the outer wall of described housing parts 63 to outer process.
With reference now to Fig. 2,, the inner structure of described detonation sensor 1 has been described.Fig. 2 is a cut-open view that shows the inner structure of described detonation sensor.
As shown in Figure 2, described detonation sensor 1 comprises support component 11, downside electrode member 17, described piezoelectric element 23, upside electrode member 19, loading element 31, nut 21, cap 41a (covering element of the present invention) and described overcoat 61.
For example, described support component 11 is by insulating material such as resin (Nylon MXD6: Vickers hardness Hv=42, Young modulus E=20.4[Gpa]) make, and comprising in the axial direction cylindrical body portion 12 and the flange portion 13 that extends, this flange portion 13 is from the axial lower portion of described main part 12 projection radially outward.In one embodiment, described flange portion 13 has the diameter of 23mm.
Through hole 71 extends through main part 12 in the axial direction.The external peripheral surface of the distal portions of the external peripheral surface of described main part 12 and described flange portion 13 has annular locking screw 75 and 76 respectively, thereby is convenient to strengthen the connection between described main part 12 and the described overcoat 61.Equally, on the external peripheral surface of described main part 12, be provided with the external thread 74 that adapts with nut 21 at the downside (after this downside in Fig. 1 is called downside) of described annular locking screw 75.
Described piezoelectric element 23 is made by the material with piezoelectric effect (for example: various types of potteries, as lead zirconate titanate (PZT) and barium titanate, various crystal such as quartz crystal, or various types of organic material such as polyvinylidene fluoride).Piezoelectric element 23 forms the form of annular, so that around around the described main part 12.Piezoelectric element 23 is arranged on the upper surface of described flange portion 13.And described piezoelectric element 23 is respectively arranged with electrode 17,19 on its basal surface and top surface.
Shown in the best among Fig. 4, described downside electrode member 17 has ring form, so that around around the described main part 12.Electrode member 17 contacts with the basal surface of described piezoelectric element 23.Described downside electrode member 17 has a terminal part 17a, and this terminal part 17a extends to described connector part 65 from the basal surface of described piezoelectric element 23.Described terminal part 17a is as the circuit of exporting electric signal from the basal surface of described piezoelectric element 23.
Described upside electrode member 19 has ring form, so that around around the described main part 12.Electrode member 19 contacts with the top surface of described piezoelectric element 23.Upside electrode member 19 has a terminal part 19a, and terminal part 19a extends to described connector part 65 from the top surface of described piezoelectric element 23.Described terminal part 19a is as the circuit of exporting electric signal from the top surface of described piezoelectric element 23.
Loading element 31 is by endless metal material (various types of metal materials, as brass) make, and this element 31 is arranged on the upside of described upside electrode member 19, so that around around the described main part 12, therefore load is applied on the described piezoelectric element 23.
Described nut 21 is made by the endless metal material, and has the internal thread (not shown), and this internal thread forms on the inner circumferential surface of nut 21.The size of nut 21 so is provided with, and makes the internal thread on it and external thread 74 engagements of described main part 12, so that nut 21 and described main part 12 are fixed together.Especially, adopt polygon (as hexagon), so that described nut 21 can be tightened and be fixed on the described main part 12 with instrument etc. with the shape of the excircle of axially vertical described nut 21.
Shown in the best among Fig. 3 A-3C, described cap 41a is made by metal material.Be used for for example rather than restriction, cap 41a is made by SUS304 stainless steel (Vickers hardness Hv=140-190, Young modulus E=197[Gpa]).Cap 41a comprises having columniform column part 45 and flange portion 43, and this flange portion 43 is from an end of described column part 45 projection radially outward.Especially, described column part 45 and described flange portion 43 are made as a whole unit and are formed.
The external diameter of the column part 45 of described cap 41a is than the internal diameter of the through hole 71 of described support component 11 big slightly (approximately 0.05-0.2mm).The external diameter of described flange 43 is usually consistent with the external diameter of the top surface of described support component 11.
As the structure of formation, the column part 45 of cap 41a is installed (press fit) from the upside of described detonation sensor 1 and is entered the described through hole 71.Cap 41a is positioned at support component 11 inside, makes the flange portion 43 of cap 41a contact with the top surface of described support component 11.That is to say that fixing described cap 41a is not so that around described support component 11 rotations.
With reference to figure 3A, Fig. 3 B and Fig. 3 C, will describe cap 41a in detail now.Fig. 3 A is the top view of cap 41a, and Fig. 3 B is the front elevation (part is cut open) of cap 41a, and Fig. 3 C is the side view (part is cut open) of cap 41a.
As shown in Figure 3A, described cap 41a comprises described column part 45 and described flange portion 43.Cap 41a comprises projection 47a equally.
Shown in Fig. 3 A and Fig. 3 B, described projection 47a is formed on two (2) individual positions of an end (downside) that does not form flange portion 43 of described column part 45.Each projection 47a relatively is provided with towards the central shaft of described column part 45 each other.Each projection 47a is (root of described projection 47a) tilt a little to the central axis direction of described column part 45 (about 5 degree) in a junction office.
With reference now to Fig. 4,, will the assembling of described detonation sensor 1 be described.Fig. 4 is a decomposition diagram that shows the several assemblies that form described detonation sensor 1.
As shown in Figure 4, in the assembling process of described detonation sensor 1, described downside electrode member 17, described piezoelectric element 23, described upside electrode member 19 and loading element 31 be according to the sequence stack that is mentioned from the downside to the upside, so that around the excircle of the main part 12 of described support component 11.
Then, nut 21 rotates on the screw thread 74 of described support component 11, so that described downside electrode member 17, described piezoelectric element 23, described upside electrode member 19 and described loading element 31 clamp and be fixed between the flange portion 13 and nut 21 of described support component 11.
Then, an injection molding is set so that injection molding is around these elements, and with the insulating material injection molding for covering these elements, thereby form overcoat 61.
At last, the column part 45 of described cap 41a inserts described through hole 71 from the upside of described detonation sensor 1.
Thereby assembled described off-resonance type detonation sensor 1.
Illustrate as institute's the best among Fig. 2, described detonation sensor 1 so forms, make the bottom of flange 13 of described support component 11 be exposed to the downside of described overcoat 61, and the flange portion 43 of the top of the main part 12 of described support component 11 and described cap 41a is exposed to the upside of described overcoat 61.And the terminal part 17a of described downside electrode member 17 and the terminal 19a of described upside electrode member 19 so form, and a feasible wherein part extends to the inside of described connector 65.
The detonation sensor 1 of Zhuan Pei off-resonance type will be connected on the internal combustion engine like this.Detonation sensor 1 will be mounted on the internal combustion engine in such a way, so that the basal surface of described detonation sensor (basal surface of the flange 13 of just described support component 11) can contact with the appropriate location (the normally mounting portion of a cylinder block) of described internal combustion engine.
With reference now to as Fig. 5,, will a kind of method that detonation sensor 1 is installed be described.An erection bolt 91 (being a retaining element in the present invention) inserts the through hole 71 that passes described support component 11 from the top surface of described support component 11, and wherein said erection bolt 91 has a slightly little external diameter of internal diameter than the column part 45 of described cap 41a.Then, described erection bolt 91 rotates on the internal thread that is formed in the internal combustion engine, thus described bolt and detonation sensor 1 is fixed on the described internal combustion engine.
When the vibration of any abnormality such as pinking (knocking) occurred in internal combustion engine, described vibration arrived piezoelectric elements 23 by the flange 13 of described support component 11.Then, therefore described piezoelectric element 23 exports an electric signal to external device (ED) by the terminal part 17a of described downside electrode member 17 and the terminal part 19a of described upside electrode member 19.
When described detonation sensor 1 is transported to described detonation sensor 1 when being mounted to the factory of internal combustion engine, described detonation sensor 1 can adopt a unit form, at this, described erection bolt 91 extends through through hole 71 from the top surface of described support component 11, as shown in Figure 5.In this structure, the projection 47a of described cap 41a contact and fixing described erection bolt 91 skid off from described through hole so that can prevent described erection bolt 91.Erection bolt 91 can not drop out when therefore, transporting described detonation sensor 1.
Above-described detonation sensor 1 comprises described support component 11 and piezoelectric element 23 with through hole 71, and described erection bolt 91 extends through in this through hole 71, and described piezoelectric element 23 is supported by described support component 11.Described detonation sensor 1 so forms, so that described erection bolt 91 extends through described through hole 71 and tighten detonation sensor from the top surface of described support component 11, and the basal surface of described support component 11 contacts with described internal combustion engine.And, described detonation sensor 1 comprises described cap 41a, this cap 41a is fixed on the described support component 11, so that top surface at least a portion of described support component 11 can be covered, and can prevent that so described erection bolt 91 directly contacts with the top surface of described support component 11 when described erection bolt 91 extends through described through hole 71.
Therefore, described detonation sensor 1 can protect the top surface of described support component 11 not by described erection bolt 91 wearing and tearing, and this is because described cap 41a has covered the top surface of described support component 11.
And, because when described detonation sensor 1 is connected on the mounting portion of described internal combustion engine, described cap 41a is connected on the described support component 11 and makes cap 41a can therefrom not separate, so the operability of the installation of described detonation sensor 1 will be enhanced.
As shown in the figure, described detonation sensor 1 so forms, and makes described cap 41a cover the whole top surface of described support component 11.Thereby, can avoid direct contact the between the top surface of described erection bolt 91 and described support component 11.And, because described cap 41a is designed to contact smoothly with described erection bolt 91, so described detonation sensor 1 can be more easily and successfully is installed on the described internal combustion engine.
And described cap 41a comprises the column part that is the hollow column type 45 that limited by described through hole 71 and from the upside of described column part 45 flange portion 43 to outer process, and this part 43 is set, to hide the top surface of described support component 11.
Therefore, in described detonation sensor 1, the described flange portion 43 that covers on the top surface of described support component 11 can be easily with described column part 45 location.And because column part 45 press fits of described cap 41a enter in the through hole 71 of described support component 11, the fixing of described cap 41a and described support component 11 can easily be realized.
Equally, described cap 41a is made of metal, and the Young modulus of this metal is bigger than support component 11.Thereby described detonation sensor 1 can protect the top surface of described support component 11 not by described erection bolt 91 wearing and tearing further.And the material of described cap 41a obtains easily, and processing easily too.
And described support component 11 is preferably made by resin material.In described detonation sensor 1, usually, the weight ratio metal of described resin in light weight, thus make the weight of institute's detonation sensor 1 reduce.Equally, the Young modulus of resin material littler than metal material.Therefore, if described support component 11 is formed from a resin, when taking place, described vibration can improve the flexibility of described support component 11 so.Therefore, can increase by loading element 31 and be imposed to weight on the described piezoelectric element 23, this causes the output of described detonation sensor 1 to increase.And, because described cap 41a has covered the top surface of described support component 11,, described support component 11 also is not easy to be worn or to denude even being made by soft material.
In addition, the present invention specifically is not confined to above-described embodiment, but can be within the scope of the invention changes and improvements in a different manner.For example, in off-resonance type detonation sensor 1 of the present invention, described piezoelectric element 23 and described loading element 31 etc. are to use with the nut 21 (tightening member) that is formed on the screw-threaded engagement on the described support component 11 to be secured to described support component 11.Yet described piezoelectric element 23 and loading element 31 etc. can directly be fixed on the described support component 11 with adhesives, and will they not be placed on the described flange portion 13.
And described support component 11 not necessarily must comprise flange portion 13.For example, if flange 13 is not formed on the support component 11, described piezoelectric element 23 and loading element 31 etc. can be clamped on the support component 11 from the two ends of detonation sensor 1 (as described in upside and downside) as nut 21 etc. by tightening member.
In the embodiment previously described, support component 11 is made by dielectric resin material.Yet, recognize equally, support component 11 can by as the pottery (pottery of making by silicate mineral, or the pottery of making by glass, cement, dissimilar nonmetal, metal oxide, carbonide or nitride, all these materials all live through hot-working) or conductive material (metal material such as iron) make.Yet, when described support component 11 is made by conductive material, be used for the insulation component that the terminal and the described support component 11 of described piezoelectric element 23 are kept apart should be arranged between described piezoelectric element 23 and the described support component 11.
Foregoing detonation sensor 1 is non-resonance-type detonation sensor.Recognize that equally detonation sensor 1 can be the detonation sensor of resonance-type.
In the described detonation sensor 1 of present embodiment, described cap 41a press fit enters in the described through hole 71, so that described cap 41a is fixed on the inner wall surface of described through hole 71.Recognize equally, cap 41a can inner wall surface by retaining element through hole 71 or as described in being fixed by welding to as bonding agent on.
And, though the detonation sensor 1 of present embodiment so forms, make and use described erection bolt 91 to be connected on the internal combustion engine, but can use a retaining element that is formed by two independent components that described detonation sensor 1 is fixed in the internal combustion engine, wherein these two independent components for example are: an element and the element from the fastening described detonation sensor of top surface of described support component 11 that extends through through hole 71.For example, particularly, one is inserted into the through hole 71 of described detonation sensor 1 from the outstanding mounting rod of internal combustion engine, and tightening member as nut with as described in the mounting rod engagement, thereby fix described detonation sensor 1.
And in the present embodiment described support component 11 is made by resin material.But, should be realized that support component 11 can be made of metal, as an example and unrestricted, this metal for example is SWCH25 (Vickers hardness number Hv=240, Young modulus E=215[GPa]).
Moreover covering element of the present invention not necessarily needs to adopt the form of above-mentioned cap 41, and can adopt the form of a plurality of screw rods (screw) element as shown in Figure 6.Especially, Fig. 6 is the top view of a detonation sensor 100, and it shows a modification of the present invention.
As shown in Figure 6, interior assembling (interfit) hole 12a is pre-formed the top surface place in the main part 12 of described support component 11.Then, described screw element 42 is made of metal, as SWCH25 (Vickers hardness number Hv=240, Young modulus E=215[GPa]), and this screw element 42 has the external diameter than the diameter big slightly (approximately 0.05-0.2mm) of pilot hole 12a in described, and is installed in this among pilot hole 12a.
Be formed on three positions on the top surface that interior pilot hole 12a in the described detonation sensor 100 is arranged on described support component 11 equably, each screw element 42 is assembled into wherein on these three positions.
Connect each screw element 42, make its top surface outstanding, thereby prevent that described erection bolt 91 from contacting with the direct of support component 11 from described support component 11.Preferably, each screw element 42 is from the outstanding about 2mm of the top surface of support component 11.
Because the screw element 42 in described detonation sensor 100 is three positions (several position) that are arranged on equably on the top surface of support component 11, so each screw element 42 can contact smoothly with described erection bolt 91.
The number of pilot hole 12a and described screw element 42 can change in persons of ordinary skill in the art will recognize that, and can use more than three and equal interior pilot hole 12a and the screw element 42 of spacing.Moreover described screw element 42 or other elements can use as adhesives and be secured on the support component 11, and pilot hole 12a in need not forming.
In the embodiment previously described, cap 41a press fit enters support component 11 so that be fixed on this support component 11.Recognize that equally described cap 41a need not be fixed on the support component 11.
Aspect this,, an example that need not be fixed to the cap 41b on the support component 11 will be described wherein with reference to figure 7 and 8.Fig. 7 is the cut-open view that shows the inner structure of detonation sensor 200, and it shows another embodiment of the present invention.Fig. 8 A is the top view of cap 41b.Fig. 8 B is the front elevation of cap 41b.
As shown in Figure 7, a plurality of juts 77 are formed on the top surface of support component 11.
Equally, shown in Fig. 8 B, described cap 41b only has flange portion 43, and do not form cap 41a a part column part 45.That is to say that described cap 41b adopts described erection bolt 91 to extend through the form of the dish with center pit wherein.A plurality of hole 43a are formed on 43 li of flange portions, with the jut 77 that holds support component 11.
These holes 43a is arranged on equably along on four positions on the circumferencial direction of flange portion 43.The described jut 77 that is formed on the support component 11 also is arranged on equably along four positions on the circumferencial direction of the top surface of support component 11, so that coincide with hole 43a.Therefore, each jut 77 that is formed on the support component 11 can engage with each hole 43a that is formed on the cap 41b respectively.
And preferred, each is formed on the projection degree of the jut 77 on the support component 11, and all the thickness than cap 41b is low.Such reason is to prevent that erection bolt 91 from directly contacting with each jut 77.
Correspondingly, when usefulness erection bolt 91 as shown in Figure 5 is installed to a detonation sensor 200 on the internal combustion engine, described cap 41b just is arranged on the top surface of described support component 11, so that each hole 43a wherein can engage with each jut 77 of support component 11, as shown in Figure 7.
When erection bolt 91 slides on cap 41b, will cause the acting force that rotates along the circumferencial direction of cap 41b to be applied on the described cap 41b.Because each hole 43a of cap 41b engages with the jut 77 of support component 11, thus guaranteed that described cap 41b is fixing by support component 11, and prevent that it from moving with respect to support component 11.
In other words, prevented that cap 41b from sliding on the top surface of support component 11, for example rotation, this is because each hole 43a of cap 41b engages with the jut 77 of support component 11.
Therefore, in shown such embodiment, promptly wherein support component 11 has jut 77 and mounted thereto 's above-mentioned cap 41b, can prevent the not frayed or abrasion of top surface of support component 11.And, because cap 41b has adopted the shape of dish, be simplified so form the processing of cap 41b.
In another embodiment, as previously described, can use support component 11, and cap 41a has column part 45 and wherein forms the flange portion 43 of porose 43a with jut 77.
In above-mentioned detonation sensor 200, a plurality of juts 77 are formed on the top surface of support component 11, so that engage with a plurality of hole 43a on being formed on cap 41b, slide on the top surface of support component 11 to prevent cap 41b.Yet, slide on support component 11 for fear of cap 41b, recognize that equally one or two surface that support component and cap are contacted with each other becomes more coarse.When the power that applies from erection bolt 91 caused the described cap of rotation, by making the surface that contacts with each other of support component and cap become coarse, the friction that produces between friction ratio cap that produces between described support component and the cap and the erection bolt 91 was bigger.Therefore, described cap is support component rotation relatively not, thereby prevents that cap from sliding on support component.
Claims (8)
1. lip-deep detonation sensor that is used to be connected to internal combustion engine, described detonation sensor comprises:
Support component, it has the through hole that extends through wherein, and described support component has top surface and basal surface, and being designed and sized to of described basal surface makes it contact with the surface of described internal combustion engine;
Piezoelectric element, it is arranged at the outside of described support component and is supported by described support component;
Covering element, this covering element is installed on the described support component, and hide at least a portion of the top surface of described support component, when described covering element was connected on the described support component, the hole that described covering element has passes wherein coincided with hole in described support component; And
Retaining element, it extends through hole in the described covering element and the hole in the described support component, the part of described retaining element self is relative with the top surface of support component, described retaining element is from the fastening described detonation sensor of the top surface of support component, the basal surface of described support component contacts with internal combustion engine simultaneously, wherein, when described retaining element was fastened to detonation sensor on the described internal combustion engine, described covering element prevented that retaining element from directly contacting with the top surface of support component.
2. detonation sensor according to claim 1, wherein said covering element is fixedly secured on the described support component.
3. detonation sensor according to claim 1, wherein said covering element hide the whole top surface of described support component.
4. detonation sensor according to claim 1, wherein said covering element comprises:
The column part that is the hollow column type, being designed and sized in the hole that is contained in the described support component of described post; And
From an end of the described column part flange portion to outer process, described flange design is for hiding the top surface of described support component.
5. detonation sensor according to claim 1, wherein said covering element have the Young modulus bigger than described support component.
6. detonation sensor according to claim 5, wherein said covering element is made of metal.
7. detonation sensor according to claim 6, wherein said support component is formed from a resin.
8. detonation sensor according to claim 1, wherein said covering element is formed with a plurality of holes on the part that hides described support component top surface; And wherein, described support component comprises the jut on a plurality of top surfaces that are formed on described support component, and being designed and sized to of described jut engages and be contained in the hole of described covering element.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005050754 | 2005-02-25 | ||
| JP2005050754 | 2005-02-25 | ||
| JP2005360571 | 2005-12-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1825080A CN1825080A (en) | 2006-08-30 |
| CN100587437C true CN100587437C (en) | 2010-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610004147A Expired - Fee Related CN100587437C (en) | 2005-02-25 | 2006-02-20 | Pinking sensor |
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| Country | Link |
|---|---|
| CN (1) | CN100587437C (en) |
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- 2006-02-20 CN CN200610004147A patent/CN100587437C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1825080A (en) | 2006-08-30 |
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