CN104088923A - Stress surface variable piston - Google Patents
Stress surface variable piston Download PDFInfo
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- CN104088923A CN104088923A CN201410293666.0A CN201410293666A CN104088923A CN 104088923 A CN104088923 A CN 104088923A CN 201410293666 A CN201410293666 A CN 201410293666A CN 104088923 A CN104088923 A CN 104088923A
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- piston
- piston ring
- oilhole
- oil
- cavity
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- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention discloses a stress surface variable piston and belongs to the technical field of vehicle speed control systems. The stress surface variable piston comprises a piston body, a piston ring group, springs and positioning pins; a pressure-relief oil hole is machined in the end surface of the piston body; an oil discharge hole is machined in the bottom surface of a chamber body of the piston body; the piston ring group is formed by piston rings, wherein the diameters of the piston rings are gradually increased in turn; the working surface of the large diameter of piston ring is a plane which is formed from the edge of the end surface and is concaved inward; the working surface of every other piston ring is a bottom surface of an annular groove formed in the end surface; an L-shaped oil hole of every piston ring penetrates the inner circumferential surface of the piston ring and the bottom surface of the annular groove; the piston ring group is flexibly arranged in the chamber body of the piston body through the springs and the positioning pins; the piston rings are stepwise arranged according to the diameter size order in a sleeving mode in turn; elastic coefficients of the springs are increased in turn along with the increase of the diameters of the piston rings. According to the stress surface variable piston, the area of the piston is stepwise increased according to different oil pressure values when oil charge is performed on a piston cylinder and accordingly the unstable control caused by mixing of the oil and the gas in the chamber body can be reduced.
Description
Technical field
Invention relates to vehicle speed variation system, is specifically related to a kind of piston of wet friction clutch, belongs to vehicle speed variation systems technology field.
Background technique
In vehicle speed variation system, the combination of clutch friction pair need to realize piston build-up pressure by controlling oil, and the Pressure characteristics of therefore controlling oil pressure plays conclusive effect to the control quality of clutch.Clutch is built the control strategy of pressing characteristic to depend primarily on the structure of clutch and controlling fuel tap.In the Oil feeding process of clutch, due to the uncertainty of oil gas state in piston cavity, cause theoretical control characteristic and the actual control characteristic obtaining sometimes to have larger discrepancy.Secondly, in clutch combination and separation process, needing oil pressure set up rapidly and discharge, is also the problem that control strategy cannot solve completely.
As shown in Figure 1, the wet friction clutch of using in gearbox, due to structural limitations, has annular housing on its piston.This clutch provides pressure by controlling oil duct for its fuel feeding, thereby makes clutch friction plate 4 carry out combination with separated with steel disc 3.At oil-filled preliminary stage, due to centrifugal action, when cavity is not full of by oil, can make empty G&O in cavity mix, the Young's modulus of chamber substance in vivo changes, thereby affects the control characteristic of this clutch.
At present for clutch build rapidly press take improve its control characteristic solution as add accumulator on oil circuit, as supplementary energy, accumulator plays as clutch hydraulic cylinder oil-filled effect fast, and can absorb hydraulic shock, reduce the pulsation of oil hydraulic pump, the stable oil pressure of controlling.But it is fast oil-filled limited in one's ability and have certain randomness, so this scheme is improved limited in one's ability to the control characteristic of this clutch.
Summary of the invention
In view of this, the invention provides a kind of change stress surface piston, when oil-filled to piston cylinder, according to different oil pressure, increase step by step piston area, can reduce or avoid oil, gas in cavity to mix the unsettled phenomenon of control producing.
A change stress surface piston, comprises piston only, piston ring group, spring and locating stud; Wherein, on the end face of described piston only, process release oilhole, on the bottom surface of piston only cavity, process row pressure oilhole;
The piston ring that described piston ring group is increased successively by diameter forms, and piston ring two ends end face is respectively working surface and mounting surface, and the piston ring working surface of diameter minimum is for being risen by the edge of end face and the plane of indent; The working surface of all the other piston rings is the bottom surface of annular groove on this end face, piston ring is processed with the oilhole of L-type, oilhole runs through the bottom surface of inner peripheral surface and the annular groove of piston ring, and oilhole enters piston ring step by step working surface for controlling oil produces end thrust;
In piston ring group, on the outer peripheral surface of all piston rings, be all processed with annular seal groove, radial direction seal ring is installed in seal groove;
In described piston ring group, piston ring is movably arranged in piston only cavity by spring and locating stud, the mounting surface of piston ring is relative with the bottom surface of piston only cavity, piston ring is set with successively step by step by diameter order, a corresponding one group of spring of piston ring, the elasticity coefficient of spring increases successively according to the increase of piston ring diameter.
Further, the working surface of piston ring all has annular chamfer, makes the control oil entering from oilhole can arrive rapidly working surface;
Further, the position of described row pressure oilhole is positioned at the maximum diameter place of the bottom surface of piston only cavity.
Further, described release oilhole runs through working surface and the mounting surface of piston only, and inner side or inside and outside both sides that position is positioned at piston only cavity have concurrently; The effect of release oilhole is to release the fluid between piston ring working surface and cylinder sleeve end face in the clutch separation stage, the release oilhole in outside played the effect of draining before piston only end face and cylinder sleeve end face laminating, after laminating, by the release oilhole of inner side, carry out draining.
Beneficial effect:
1, piston of the present invention changes effective active area under different oil pressure, eliminate the impact of the enchancement factor of clutch plunger cavity original state, from mechanical structure, obtain definite control characteristic, be convenient to further by control strategy, obtain desirable oil pressure control characteristic.
2, piston ring of the present invention has replaced the space of gas, makes to control oil and reduces air-fuel mixture state, makes its mixing elastic modulus change less, and the pressure release stage is steady, meets the control requirement of clutch, is beneficial to research and the control of building pressure process.
3, the working surface of piston ring of the present invention all has annular chamfer, makes the control oil entering from oilhole can arrive rapidly working surface, has further improved the control performance of clutch.
4, the present invention utilizes and becomes stress surface piston and use the control characteristic of clutch to improve, and can reduce the impact of clutch, has improved the travelling comfort of vehicle and has extended working life of mechanical part.
Accompanying drawing explanation
Fig. 1 is the structural representation of friction clutch in prior art;
Fig. 2 is the plan view that the present invention becomes stress surface piston;
Fig. 3 is the A-A sectional view of Fig. 2;
Fig. 4 is the partial enlarged drawing at I position in Fig. 3;
Fig. 5 is the partial enlarged drawing at II position in Fig. 3.
Wherein, 1-piston only, 2-cylinder sleeve, 3-steel disc, 4-friction plate, 5-piston ring I, 6-piston ring II, 7-piston ring III, 8-piston ring IV, 9-spring, 10-locating stud, 11-oilhole, 12-release oilhole, 13-row pressure oilhole.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
As shown in accompanying drawing 2,3 and 4, the invention provides a kind of change stress surface piston, comprise piston only 1, piston ring group, spring 9 and locating stud 10; Wherein, described piston ring group comprises piston ring I 5, piston ring II 6, piston ring III 7 and piston ring IV 8, the diameter of piston ring I 5, piston ring II 6, piston ring III 7 and piston ring IV 8 increases successively, the two ends end face of piston ring I 5 is respectively working surface and mounting surface, this working surface is for being risen by the edge of end face and the plane of indent, and this plane extends to the inner peripheral surface of piston ring I 5; The working surface of piston ring II 6, piston ring III 7 and piston ring IV 8 is the bottom surface of annular groove on this end face, in piston ring II 6, piston ring III 7 and piston ring IV 8, be processed with the oilhole 11 of L-type, oilhole 11 runs through inner peripheral surface separately and the bottom surface of annular groove, and oilhole 11 enters step by step working surface separately and produces end thrust for controlling oil;
The combination of clutch friction plate and steel disc is controlled oil duct with separated dependence and is provided pressure to promote piston movement and realize, become stress surface piston plays a role in these two processes: in cohesive process, piston ring promotes to make piston effective area to increase successively, in separation process piston ring successively return piston effective area is reduced.
1) cohesive process
1. control oil duct oil pressure is provided, piston ring I 5, piston ring II 6, piston ring III 7 and piston ring IV 8 are not all worked.If have liquid or high pressure in the cavity between piston and piston ring, can be by 13 unloadings of row pressure oilhole.
2. control oil pressure and increase, the elastic force that piston only 1 overcomes return spring under oil pressure effect starts to move and be adjacent to steel disc.Select the spring of proper stiffness and quantity, make after this piston ring I 5 start to be pushed until be adjacent to the bottom surface of piston only cavity, oilhole 11 exposes, and the end face of piston ring II 6 is subject to thrust left.
3. control oil pressure and continue to increase, piston ring II 6 be pushed until with the bottom surface laminating of piston only 1 cavity, the oilhole of piston ring III 7 exposes, piston ring III 7 is subject to thrust left.
4. control oil pressure and continue to increase, steel disc and friction plate generation wear smooth or combination.Piston ring III 7 is pushed into the bottom surface laminating with piston only 1 cavity, and the oilhole of piston ring IV 8 exposes, and piston ring IV 8 is subject to thrust left.
5. control oil pressure and continue to increase, piston ring piston ring IV 8 is pushed to the bottom surface laminating with piston only 1 cavity, and now the work area of whole piston only 1 has reached maximum.Steel disc and friction plate move and combination under the piston of " complete " promotes.
2) separation process
1. control oil pressure and reduce, piston ring IV 8 is return under the effect of spring 9;
2. control oil pressure and continue to reduce, piston ring III 7 and piston ring II 6 return successively under the effect of spring separately;
3. control oil pressure and continue to reduce, piston only 1 is separated with adjacent steel disc, and now pressure release oilhole 12 starts draining, until each element return.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. become a stress surface piston, it is characterized in that, comprising: comprise piston only, piston ring group, spring and locating stud; Wherein, the end face of described piston only processing release oilhole, processes oil drainage hole on the bottom surface of piston only cavity;
The piston ring that described piston ring group is increased successively by diameter forms, and piston ring two ends end face is respectively working surface and mounting surface, and the piston ring working surface of diameter minimum is for being risen by the edge of end face and the plane of indent; The working surface of all the other piston rings is the bottom surface of annular groove on this end face, and piston ring is processed with the oilhole of L-type, and oilhole runs through the bottom surface of inner peripheral surface and the annular groove of piston ring;
In piston ring group, on the outer peripheral surface of all piston rings, be all processed with annular seal groove, radial direction seal ring is installed in seal groove;
Its integrated connection closes: in described piston ring group, piston ring is movably arranged in piston only cavity by spring and locating stud, the mounting surface of piston ring is relative with the bottom surface of piston only cavity, piston ring is set with successively step by step by diameter order, a corresponding one group of spring of piston ring, the elasticity coefficient of spring increases successively according to the increase of piston ring diameter.
2. change stress surface piston as claimed in claim 1, is characterized in that, the working surface of described piston ring all has annular chamfer.
3. change stress surface piston as claimed in claim 1 or 2, is characterized in that, the position of described row pressure oilhole is positioned at the maximum diameter place of the bottom surface of piston only cavity.
4. change stress surface piston as claimed in claim 1 or 2, is characterized in that, described release oilhole runs through working surface and the mounting surface of piston only, and inner side or inside and outside both sides that position is positioned at piston only cavity have concurrently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410293666.0A CN104088923B (en) | 2014-06-26 | 2014-06-26 | Stress surface variable piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410293666.0A CN104088923B (en) | 2014-06-26 | 2014-06-26 | Stress surface variable piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104088923A true CN104088923A (en) | 2014-10-08 |
| CN104088923B CN104088923B (en) | 2015-07-01 |
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ID=51636666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410293666.0A Active CN104088923B (en) | 2014-06-26 | 2014-06-26 | Stress surface variable piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104088923B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4745846A (en) * | 1978-05-30 | 1988-05-24 | Karl Eickmann | Devices which take in and expel fluid by a chamber which may border a coned ring |
| CN202251537U (en) * | 2011-09-15 | 2012-05-30 | 余姚市安统五金有限公司 | Central release bearing for controlling hydraulic clutch |
| CN102562851A (en) * | 2012-03-13 | 2012-07-11 | 朱彦春 | Separating unit for clutch |
| CN102667264A (en) * | 2009-12-14 | 2012-09-12 | 贺尔碧格压缩机技术控股有限公司 | Piston having piston rings and support rings |
-
2014
- 2014-06-26 CN CN201410293666.0A patent/CN104088923B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4745846A (en) * | 1978-05-30 | 1988-05-24 | Karl Eickmann | Devices which take in and expel fluid by a chamber which may border a coned ring |
| CN102667264A (en) * | 2009-12-14 | 2012-09-12 | 贺尔碧格压缩机技术控股有限公司 | Piston having piston rings and support rings |
| CN202251537U (en) * | 2011-09-15 | 2012-05-30 | 余姚市安统五金有限公司 | Central release bearing for controlling hydraulic clutch |
| CN102562851A (en) * | 2012-03-13 | 2012-07-11 | 朱彦春 | Separating unit for clutch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104088923B (en) | 2015-07-01 |
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