CN100476228C - Piston - Google Patents
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- CN100476228C CN100476228C CNB2005800085969A CN200580008596A CN100476228C CN 100476228 C CN100476228 C CN 100476228C CN B2005800085969 A CNB2005800085969 A CN B2005800085969A CN 200580008596 A CN200580008596 A CN 200580008596A CN 100476228 C CN100476228 C CN 100476228C
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- seal
- stiffening element
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Abstract
A part of a rubber layer of the base section of a piston seal is replaced with a reinforcement ring with high rigidity, and a part of the reinforcement ring reaches the root of a seal lip. This provides the piston seal with required rigidity. Further, providing an outer diameter side radial section on a piston body secures a contact width coming into contact with a section to be pressed. A piston has a piston body (111) having a clutch pressing section (111f) provided so as to be in surface-contact with a multiple disc clutch (105), a reinforcement ring (112) fitted on the outer periphery of an outer cylinder section (111e) of the piston body, and an outer peripheral seal lip (113a) provided on the reinforcement ring and in sealing contact with the inner peripheral surface (102a) of the outer peripheral section of a housing (102).
Description
Technical field
The present invention relates to a kind of automobile that for example is used for the piston of automatic transmission etc.
Background technique
In the automatic transmission of automobile, the piston that utilizes oil pressure in housing, to work, make the driver plate of drive shaft side and the follower plate clutch of driven shaft side, thereby make the clutch switch motion, this piston, patent documentation described as follows 1 is disclosed like that, is formed with the piston seal that is made of the rubber-like elasticity material integratedly.
Patent documentation 1: the spy opens flat 9-210088 communique
Fig. 7 is with patent documentation 1 described piston apparatus (piston) in the past, and the plane of reinstating by axle center O with the part one of automatic transmission cuts off the half-sectional view of representing.Promptly, this piston 401, because the pressure chamber 403 between itself and housing 402 is pressurized, therefore overcome active force below displacement in figure of the spring 405 that is supported on the spring stop 404, be formed at this periphery tube 401a of portion the lower end pushing portion with the driver plate 406a of multiplate clutch 406 to follower plate 406b pushing and with its frictional fit, thereby via housing 402, multiplate clutch 406 and clutch spider hub 407, with the driving torque of live axle to the driven shaft transmission.
On the other hand, as the automatic transmission that is used in automobile etc., have as everyone knows a kind of as shown in Figure 8, the pushing force of mobile hydraulic piston is carried out the control of multiplate clutch by loading oil pressure under turn state, thereby carry out the technology of speed Control.
Fig. 8 is that the general structure that the general structure to the speed change switching part of automatic transmission describes partly cuts open figure.
As shown in Figure 8, the outer circumferential face of the inner peripheral surface of housing 500 and live axle 501 is interfixed and is sealed, and forms the piston patchhole 502 of ring-type.
Be provided with multiplate clutch 503 in the inboard of housing 500, in piston patchhole 502, can on axle direction, be provided with the piston element 504 of ring-type movably simultaneously.
In addition, in the periphery of live axle 501 spring stop 505 that has limited axial mobile ring-type is installed.This spring stop is set at block 506 restrictions of live axle 501 and moves.
And, be provided with the sealing lip 511 of the outer circumferential face that is used for sealing drive shaft 501 at the inner peripheral surface of piston element 504, be provided with at the outer circumferential face of piston element 504 inner peripheral surface that is used for seal casinghousing 500 and sealing be contacted with the sealing lip 512 of this inner peripheral surface.Like this, piston patchhole 502 is sealed, thereby form hydraulic chamber with sealing lip 511,512.These sealing lips 511,512 are made of rubber-like elastic body.
In above-mentioned structure, when effect has oil pressure (arrow P), pressure rising, piston element 504 overcomes the active force of spring 508 to spring stop 505 sides (lower direction among the figure) motion, end (R portion) the 504b pushing multiplate clutch 503 of the section U word shape 504a of portion of the outer circumferential side of usefulness piston element 504.Thus, be arranged at the clutch plate of housing 500 sides and the clutch plate rubbing contact of driven shaft (not shown) side, the rotary driving force of housing 500 is to the driven shaft transmission.
Like this, piston element 504, as axially moving when being subjected to oil pressure, and the rubber-like elastic body 513 that constitutes sealing lip 511,512 is integrally formed in the so-called convolution piston seal (combined type piston seal) on the parent and plays a role.Such piston element for example is disclosed in the patent documentation 2.
Patent documentation 2: the spy opens flat 11-351273 communique
Patent documentation 3: the spy opens flat 9-257058 communique
Summary of the invention
But, in piston apparatus in the past shown in Figure 7, being arranged on integratedly on its peripheral part of piston 401 and the sealed diameter d of the piston seal 408 that closely contacts with the inner peripheral surface of the periphery tube 402a of portion in the housing 402
1The sealed diameter d2 (internal diameter of the periphery tube 401a of portion of piston 401) of the position of the pushing portion relative with multiplate clutch 406 among the periphery tube 401a of portion of (internal diameter of the periphery tube 402a of portion of housing 402), piston 401 and the periphery of the spring stop 404 that is arranged on supported spring 405 integratedly and the spring stop Sealing 409 that closely contacts with the inner peripheral surface of the periphery tube 401a of portion of piston 401 etc. are by the design (layout) of circumferential component, require performance etc. to decide.Therefore, according to position relation of multiplate clutch 406 and piston 401 etc., sometimes it is big that the missionary society of above-mentioned sealed diameter d1, d2 becomes, and in this case, the rubber layer 408a that forms piston seal 408 by the periphery tube 401a of portion that will adhere to piston 401 increases wall thickness on the direction of footpath deals with.
But, on the direction of footpath, increase wall thickness if will form the rubber layer 408a of piston seal 408, then the distortion by the caused piston seal 408 of the oil pressure that is directed to pressure chamber 403 becomes big, can produce because with the too early wearing and tearing of the piston seal that increase causes 408 of the area of contact of the inner peripheral surface of the periphery tube 402a of portion of housing 402 and contact load, revolve and dig wearing and tearing (え ぐ れ abrasion), thereby cause the such problem of resistance to pressure durability reduction of piston seal 408.
On the other hand, in piston element shown in Figure 8 504, on the direction of footpath, must between the inner peripheral surface of the outer circumferential face of live axle 501 and housing 500, form pushing face, be provided with the section U word shape 504a of portion that section shape is a U word shape in order to form with steel plate, but become the structure of the 504b of the R portion pushing multiplate clutch (being pushed splenium) 503 of this section U word shape 504a of portion, so being difficult to guarantee fully to be contacted with the contact width of multiplate clutch 503 (if want the width of section U word shape portion is enlarged in the footpath direction, then may interfere with the inner peripheral surface and the baffle plate 505 of housing 500.In addition, if want at the fore-end of section U word shape portion the plane to be set, then may produce stress in this part and concentrate, intensity will worsen).Therefore, may produce following dynamic problem, promptly the contact pressure of the 504b of R portion uprises, and (owing to using over a long time or for a long time) wearing and tearing and distortion become big when durable, thereby causes the aging of clutch characteristics because face presses to change.
In addition, at manufacture view, system ring (manufacturing) the degree of difficulty height of the section U word shape 504a of portion, the how such problem of operation of system ring are arranged.
In addition, such problem is arranged aspect quality,, therefore add the load that loads on material man-hour and will become greatly, be easy to generate crackle in the R portion of interior all sides of the section U word shape 504a of portion at steel plate bending promptly owing to be section U word shape.And, also have the R portion of interior all sides of the section U word shape 504a of portion can not implement the such problem of visual examination fully.
In addition, must be useful on rubber-like elastic body hot sticky in the bonding processing of piston element 504, but must wash fully in the bond strength operation before this in order to ensure binder.Especially, under the situation of the narrow gaps of the paddy portion (inboard) of the section U word shape 504a of portion,,, might produce and peel off so the bonding of rubber-like elastic body just becomes insufficient because washing becomes insufficient.
In addition, rubber-like elastic body must be flowed into the paddy portion (inboard) of the section U word shape 504a of portion, need the rubber-like elastic body of excess quantity, under the situation that rubber-like elastic body does not flow into well, may become bad shaping.
The present invention in view of above some and make, no matter the sealed diameter that its objective is size that a kind of piston only is provided and the piston seal integrally formed with it how, can both prevent because the too early wearing and tearing that the increase of the surface of contact of piston seal and contact load causes and the reduction of resistance to pressure durability.
In addition, the object of the present invention is to provide a kind of contact width that is pushed splenium of guaranteeing to be contacted with, and then by section U word shape portion is made as the piston that divergence type reaches the raising of quality.
In order to achieve the above object, in piston of the present invention, have:
Piston only, this piston only is axially moved to be arranged in the annular aperture freely, has footpath direction portion, side axle direction portion of extending and the outside diameter that extends to outside diameter from the end of axle direction one side of this an axle direction portion direction portion directly axially from the external diameter end of this footpath direction portion;
Be arranged at the stiffening element on the periphery of above-mentioned axle direction portion of above-mentioned piston only; And
Sealed member, the sealing parts are arranged at above-mentioned stiffening element, have the sealing lip of the outer circumferential face side of the above-mentioned annular aperture of sealing; It is characterized in that,
Above-mentioned stiffening element has the part of the root that extends to above-mentioned sealing lip.
Like this; a part that becomes the rubber layer in the base portion of piston seal (sealed member) is replaced into the such structure of the bigger stiffening ring of rigidity; the one end arrives the root of the sealing lip of piston seal (sealed member); so no matter the sealed diameter of the size of piston only and the piston seal (sealed member) integrally formed with it how; can guarantee the required rigidity of piston seal (sealed member), can prevent because wearing and tearing are dug in contacting the too early wearing and tearing that cause fully and revolving of the sealing lip of piston seal (sealed member).
In addition, under the situation that axle direction moves, can be pushed splenium with enough contact widths with lower surface pressure pushing at piston with the outside diameter footpath direction portion that is arranged at piston only.So, even over a long time or under the long-time situation about using, can be than suppressing wearing and tearing and distortion more in the past, press the aging of the clutch characteristics that changes thereby suppress the face that is accompanied by.And the length (width) of outside diameter footpath direction portion can suitably be set so that push according to the specification of piston sufficient contact width when being pushed splenium.In addition, the section U word shape portion that is applied to piston in the past is made as separation pattern (separating), can suppresses thus because the generation of the problems that section U word shape portion in the past causes.
In addition, in above-mentioned structure, be preferably the above-mentioned outside diameter footpath direction portion that above-mentioned stiffening element is located in above-mentioned piston only, and it is thereon chimeric to spread all over the Zone Full ground of above-mentioned axle direction portion.Especially, above-mentioned stiffening element preferably is positioned on the end face of axle direction opposite side of above-mentioned outside diameter footpath direction portion.
Like this, by the stiffening element contact being positioned the outside diameter footpath direction portion of piston only, the sealability of the sealed member that is arranged at stiffening element can be further stablized, in addition, the pushing force under the situation that the pushing of outside diameter footpath direction portion is pushed splenium can be stablized.In addition, thereon chimeric by the Zone Full ground that stiffening element is spreaded all over axle direction portion, can make the intensity of telescoping part become big, so can stablize the sealability of the sealed member that is arranged at stiffening element.
In addition, in the above-mentioned structure, preferably at above-mentioned piston only axially under the situation of a side shifting, above-mentioned outside diameter footpath direction portion pushes the splenium that is pushed on the outer circumferential face next door that is arranged at above-mentioned annular aperture planarly.
In addition, in above-mentioned structure, be preferably and also have interior all side sealing parts, should be arranged at above-mentioned piston only by interior all side sealing parts, seal the inner peripheral surface side of above-mentioned annular aperture, above-mentioned sealed member and above-mentioned in all side sealing parts, after above-mentioned stiffening element is embedded in above-mentioned piston only, be integrally formed on the chimeric above-mentioned piston only that above-mentioned stiffening element arranged.
In addition, in above-mentioned structure, be preferably above-mentioned sealed member and be formed on the above-mentioned stiffening element, above-mentioned stiffening element after having formed above-mentioned sealed member, is embedded on the above-mentioned piston only.
As above explanation, utilize the present invention, owing to can guarantee the required rigidity of piston seal, prevent because too early wearing and tearing that the mistake close contact of the sealing lip of piston seal causes and revolve and dig wearing and tearing, so can keep the resistance to pressure durability of piston seal.
In addition, according to the present invention, can provide a kind of piston, this piston has guaranteed to be contacted with the contact width that is pushed splenium, and separates the raising that pattern has been realized quality by section U word shape portion is made as.
Description of drawings
(Fig. 1) Fig. 1 is a mode of piston that piston apparatus of the present invention is applied to the automatic transmission of automobile, cuts off the half-sectional view of representing with the part of automatic transmission on the plane by axle center O.(mode of execution 1)
(Fig. 2) Fig. 2 is the another way of piston that piston apparatus of the present invention is applied to the automatic transmission of automobile, cuts off the half-sectional view of representing on the plane by axle center O.(mode of execution 2)
(Fig. 3) Fig. 3 is the another way of piston that piston apparatus of the present invention is applied to the automatic transmission of automobile, cuts off the half-sectional view of representing on the plane by axle center O.(mode of execution 3)
(Fig. 4) Fig. 4 is the general structure half-sectional view of the piston of expression embodiments of the present invention 4.
(Fig. 5) Fig. 5 is the general structure half-sectional view that is used to illustrate the general structure of speed change switching part, and this speed change switching part has been to use the speed change switching part of the convolution piston seal that the piston by embodiments of the present invention 4 constitutes.
(Fig. 6) Fig. 6 is the general structure half-sectional view of the piston of expression embodiments of the present invention 5.
(Fig. 7) Fig. 7 is the piston apparatus with in the past, with the part of automatic transmission, cuts off the half-sectional view of representing on the plane by axle center O.
(Fig. 8) Fig. 8 is the general structural map of speed change switching part of using the piston of conventional art.
Label declaration
101 pistons (piston apparatus), 111 piston onlies
112 stiffening rings, 113 peripheral seal (piston seal)
All sealing lips in the 113a periphery sealing lip 114a
All Sealing 115 membranous parts in 114
102 housings, 103 live axles
104 clutch spider hubs, 105 multiplate clutches
106 springs, 107 spring stops
171 blocks, 172 spring stop Sealings
A, B pressure chamber 201 convolution piston seals
211,221 pistons, 212 piston onlies
The 212a end plate 212b of portion rake
The 212c urceolus 212d of portion clutch pushing portion
212e inner cylinder portion 212f block (engagement protrusion such as location)
213 stiffening ring 213a axle direction portions
213b footpath direction portion 214 piston seals
All sealing lips in the 214a periphery sealing lip 214b
214c block (engagement protrusion such as location) 202 live axles
222 oil pressure supply passages, 203 housings
231 footpath direction portions, 232 rounded portions
204 multiplate clutches, 205 piston patchholes
208 spring stops, 209 blocks (elasticity baffle ring)
210 springs
Embodiment
Following with reference to drawing, describe the specific embodiment of the present invention in detail based on embodiment's illustration ground.But, the size of the described structural member of present embodiment, material, shape, its configuration etc. relatively, short of specific especially record, just and do not mean that scope of the present invention only is defined in this.
(mode of execution 1)
Following with reference to drawing, the preferred forms 1 of piston apparatus of the present invention is described.At first Fig. 1 is a half sectional view, is with making piston apparatus of the present invention be applied to a example on the piston 101 of automatic transmission of automobile, with the part of automatic transmission, to block the figure that represents by the plane of axle center O.
That is to say that piston 101 is equivalent to the described piston of claim 1, have piston only 111, be fixed in this piston only 111 stiffening ring 112, be engaged in this piston only 111 and stiffening ring 112 both sides and the peripheral seal (piston seal) 113 integrally formed with its peripheral part.
Piston only 111 utilizes to be made the sheet metal drawing, comprise: inner cylinder portion 111a, lip part 111b from the expansion of one end radius vector direction, from the intermediate cylinder portion 111c of its periphery to the opposition side extension of inner cylinder portion 111a, the 111d of end plate portion from its end radius vector direction extension, 111e of urceolus portion of circumferentially identical direction extension outside it with the 111c of intermediate cylinder portion, the clutch pushing 111f of portion of the edge shape that is bent to form to periphery from the front end of the 111e of this urceolus portion.In addition, stiffening ring 112 utilizes the punching press of sheet metal or the cut-out of metal tube to make, and is pressed into the outer circumferential face of the 111e of urceolus portion that is embedded in piston only 111 with suitable magnitude of interference.
Peripheral seal (piston seal) the 113rd is made of the rubber-like elasticity material, has periphery sealing lip 113a towards the opposition side of multiplate clutch 105 described later, its base portion 113b, sulfuration integratedly is bonded in from the 111d of end plate portion of piston only 111 to the outside of the curved part of the 111e of urceolus portion be pressed on stiffening ring 112 both sides that are embedded in the above-mentioned urceolus 111e of portion.And axle direction one end of stiffening ring 112 arrives the root portion of the periphery sealing lip 113a of peripheral seal (piston seal) 113.
That is to say, this peripheral seal (piston seal) 113, be to be arranged in the vulcanization of rubber molding die of regulation by will on the 111e of urceolus portion, being pressed into chimeric stiffening ring 112 in advance and being coated with the piston only 111 that vulcanizes binder, in the inner chamber of the ring-type that between the inner face of piston only 111 and stiffening ring 112 and above-mentioned mould, is divided into by matched moulds, fill unvulcanized rubber material and heating pressurization, be bonded on piston only 111 and the stiffening ring 112 thereby in vulcanization forming, vulcanize.
In detail, spring stop 107 is by making the sheet metal drawing, comprise: interior all lip part 107a, the circumferential 107b of intermediate cylinder portion that extends of the circumferential position of the 111c of intermediate cylinder portion the piston only 111 of piston 101 outside it, and and then from the inner peripheral surface of the urceolus portion 111e of its end to outer circumferential side expansion and peripheral end and above-mentioned piston only 111 over against the approaching 107c of peripheral outer lips portion.Peripheral end at the 107c of this peripheral outer lips portion, be formed with the spring stop Sealing 172 that constitutes by the rubber-like elasticity material integratedly, closely be contacted with the inner peripheral surface of the 111e of urceolus portion in the above-mentioned piston only 111 slidably towards the periphery of the sealing lip 172a of the opposition side of multiplate clutch 105.
In above structure, if to what between the inner face of housing 102 and piston 101, divided, the A of pressure chamber by O-ring seals 131 and peripheral seal (piston seal) 113 sealings, import operating oil pressure by not shown oil circuit, simultaneously by another not shown oil circuit, to between piston 101 and spring stop 107, be divided, the B of pressure chamber by 172 sealings of spring stop Sealing is open, then piston 101 pressure springs 106 below displacements in Fig. 1 simultaneously, the clutch pushing 111f of portion in the piston only 111 with the driver plate in the multiplate clutch 105 151 to follower plate 152 pushings and make its frictional fit in this follower plate 152.Therefore, multiplate clutch 105 becomes coupled condition, and the driving torque of live axle 103 is passed through multiplate clutch 105 and clutch spider hub 104 from housing 102, to not shown driven shaft transmission.
In addition, if the oil pressure of the A of pressure chamber is discharged, supply with working oil to the B of pressure chamber simultaneously, then because the rebounding force of compressed spring 106, piston 101 will be so that the mode that the volume of the A of pressure chamber dwindles top displacement in Fig. 1, releasing is to the pushing of driver plate 151, so multiplate clutch 105 becomes off state, thereby cuts off from the transmission of live axle 103 to the driving torque of driven shaft.
At this, piston 101 in design, make 113 of peripheral seal (piston seal) closely the peripheral part inner face 102a of the housings 102 of contact internal diameter, be the sealed diameter d of peripheral seal (piston seal) 113
113, the internal diameter of the 111e of urceolus portion of the piston onlies 111 that closely contact with 172 of spring stop Sealings, be the sealed diameter d of spring stop Sealing 172
172Difference become bigger.Therefore, the sealed diameter d of the external diameter of the above-mentioned urceolus 111e of portion and peripheral seal (piston seal) 113
113Poor Δ d also become big.
But according to this form, owing to stiffening ring 112 is arranged in that the outer circumferential face of the 111e of urceolus portion of piston only 111 is chimeric, so in fact, the external diameter of this stiffening ring 112 becomes the supporting frame for peripheral seal (piston seal) 113.In other words, a part that becomes the rubber layer 113c that will extend from the base portion 113b of peripheral seal (piston seal) 113 is replaced into the such structure of the stiffening ring that is made of the metal enough bigger than its rigidity 112, the root portion of the periphery sealing lip 113a of one end arrival peripheral seal (piston seal) 113.Therefore, peripheral seal (piston seal) 113 needn't be according to the external diameter of the 111e of urceolus portion of piston only 111 and the sealed diameter d of peripheral seal (piston seal) 113
113Difference Δ d make the outstanding length lengthening of periphery sealing lip 113a, the footpath direction wall thickness of rubber layer 113c is increased, just can guarantee the desired stiffness of periphery sealing lip 113a and base portion 113b.
So, in order to make piston 101 displacement downwards make multiplate clutch 105 become coupled condition, by importing operating oil pressure the A of pressure chamber is become under the situation of high pressure, can prevent because the oil pressure in the A of this pressure chamber, the periphery sealing lip 113a tension of peripheral seal (piston seal) 113 is contacted with the situation of inner peripheral surface 102a of the peripheral part of housing 102, and then, can prevent because the too early wearing and tearing of the caused peripheral seal of increase (piston seal) 113 of area of contact and contact load and revolve the generation of digging wearing and tearing, thereby can keep the resistance to pressure durability.
(mode of execution 2 and mode of execution 3)
Next, Fig. 2 and Fig. 3 are half sectional views, are respectively to make piston apparatus of the present invention be applied to other mode of executions of piston 101 of the automatic transmission of automobile, to use the plane by axle center O to cut off the figure that represents.
Fig. 2 and piston 101 shown in Figure 3, all have discoid piston only 111, be fixed in its peripheral part stiffening ring 112, engage this piston only 111 and stiffening ring 112 both sides' and be integrally formed in peripheral seal (piston seal) 113 on its peripheral part, be arranged on interior all Sealings 114 on the interior perimembranous of piston only 111 integratedly.And, the piston 101 of this mode also mode of fundamental sum Fig. 1 is the same, by the operating oil pressure that is directed to the pressure chamber, overcome active force below displacement in figure of the spring that is being supported by spring stop, clutch pushing portion 111 compresses and makes its frictional fit in follower plate to follower plate the driver plate of multiplate clutch.
Piston only 111 is to utilize drawing and sheet metal is made into flat discoid forming, all lip part 111g in comprising, at the clutch pushing portion 111f of its periphery by the 111i of intermediate flange portion of the 111h of intermediate step portion radius vector direction expansion and the edge shape that further forms by periphery stepped part 111j in its periphery.In addition, stiffening ring 112 also is that the drawing by sheet metal is made, and is pressed into the outer circumferential face that is embedded in periphery stepped part 111j piston only 111, the short cylindrical shape with suitable magnitude of interference.
The stiffening ring 112 of Fig. 2 mode is the section L font roughly with footpath direction portion and 112a and the 112b of axle direction portion, this footpath direction 112a of portion, when being pressed on the periphery stepped part 111j that is embedded in piston only 111, inner circumference edge touches the clutch pushing 111f of portion in piston only 111, the 112b of this axle direction portion is from the opposition side bending to the above-mentioned clutch pushing 111f of portion of the periphery of the footpath direction 112a of portion.In addition, the stiffening ring 112 of Fig. 3 mode is roughly コ font of section, has interior all axle direction 112c of portion of being pressed into the periphery stepped part 111j that is embedded in piston only 111, extends and touch in the footpath of the clutch pushing 111f of the portion 112d of direction portion, from the peripheral shaft direction portion 112e of its periphery to the opposition side bending of the above-mentioned clutch pushing 111f of portion from the one end.
Peripheral seal (piston seal) the 113rd is formed by the rubber-like elasticity material, periphery sealing lip 113a with the illustrated Fig. 1 in front, its base portion 113b towards the opposition side of multiplate clutch 105 be adhered to by sulfuration integratedly piston only 111 periphery stepped part 111j the outside and be pressed on stiffening ring 112 both sides that are embedded in this periphery stepped part 111j.The peripheral shaft direction 112e of portion of the 112b of axle direction portion of the stiffening ring 112 of Fig. 2 mode or the stiffening ring 112 of Fig. 3 mode, the root portion of the periphery sealing lip 113a of arrival peripheral seal (piston seal) 113.
On the other hand, interior all Sealings 114, identically with peripheral seal (piston seal) 113 be made of the rubber-like elasticity material, be connected with peripheral seal (piston seal) 113 by membranous part 115, curing is adhered to the interior all ends of the interior all lip part 111g in piston only 111.Should in all Sealings 114 have interior all sealing lip 114a of previous illustrated opposition side towards multiplate clutch 105 shown in Figure 1, be with Fig. 1 mode in O-ring seals 131 parts of interior all sides of sealing load chamber A similarly.
Peripheral seal (piston seal) 113 and interior all Sealings 114, be stiffening ring 112 to be pressed into the piston only 111 that is matched with periphery stepped part 111j and has been coated with the sulfuration binder by in the vulcanization of rubber molding die of regulation, being provided with in advance, and in the inner chamber of the ring-type of the inner face of face from the interior perimembranous of piston only 111 to stiffening ring 112 and above-mentioned mould, being divided by matched moulds, fill unvulcanized rubber material and overheated pressurization, thereby in vulcanization forming, vulcanize bonding formation.
And, in the mode of Fig. 2 or Fig. 3, be fixed in the 112b of axle direction portion of stiffening ring of piston only 111 or the root portion that the peripheral shaft direction 112e of portion arrives the periphery sealing lip 113a of peripheral seal (piston seal) 113, so guaranteed the required rigidity of periphery sealing lip 113a and base portion 113b.So, can prevent because the periphery sealing lip 113a of operating oil pressure peripheral seal (piston seal) 113 crosses the situation of the inner peripheral surface of the peripheral part that is contacted with housing tightly, and then can prevent because the too early wearing and tearing of the caused peripheral seal of increase (piston seal) 113 of area of contact and contact load and revolve the generation of digging wearing and tearing can be kept the resistance to pressure durability.
And in each above-mentioned mode, stiffening ring 2 still, also can utilize the means beyond being pressed into all by being pressed into the chimeric piston only 111 that is fixed in, and for example piston only 111 is fixed in welding or soldering etc.In addition, the section shape of stiffening ring 112 is that the size of considering the base portion 113b of peripheral seal (piston seal) 113 waits suitably and determines, is not defined in shown in the diagram especially.
(mode of execution 4)
Fig. 4 is the general structure half sectional view of the piston 211 of expression embodiment of the present invention 4.Fig. 5 is the general structure half sectional view, is used to illustrate the general structure of the speed change switching part of having used the convolution piston seal 201 that the piston 211 by embodiment of the present invention 4 constitutes.
As shown in the figure, be provided with live axle 202 at the speed change switching part, be arranged at the roughly housing 203 of L font of the outer circumferential side of live axle 202 and interior shape section.
Housing 203 has footpath direction portion 231 and rounded portions 232.Accommodating multiplate clutch (being pushed splenium) 204 in interior all sides of rounded portions 232.The switch gear that also seal arrangement of present embodiment can be used for break in addition as keep plate.
And, between the outer circumferential face of the inner peripheral surface of rounded portions 232 and live axle 202, forming the piston patchhole (annular aperture) 205 of ring-type, piston 211 can be in axle direction inserts this piston patchhole 205 with moving freely.And it is the outer circumferential face of piston patchhole 205 that the inner peripheral surface of rounded portions 232 also can be said to, and also to can be said to be the inner peripheral surface of piston patchhole 205 to the outer circumferential face of live axle 202 in addition.
The piston seal 214 that piston 211 has piston only 212, stiffening ring 213, is made of rubber-like elastic body.
Piston only 212 is sheet metal (for example SAPH440) metal rings, comprise: towards the 212a of end plate portion of the washer-shaped of the end face of the footpath direction portion 231 of housing 203, the rake 212b that tiltedly extends to outside diameter and multiplate clutch 204 inclinations axially from the external diameter end of the 212a of end plate portion, the 212c of urceolus portion that extends of multiplate clutch 204 sides axially from the external diameter end of rake 212b, the clutch pushing 212d of portion that extends to outside diameter from axle direction multiplate clutch 204 side ends of the 212c of urceolus portion, the inner cylinder portion 212e that extends to internal diameter direction and axle direction multiplate clutch 204 sides from the inner diameter end of the 212a of end plate portion.Piston only 212 is formed by die forging (for example drawing) in addition.
At this, the 212c of urceolus portion constitutes axle direction of the present invention portion, and 212a of end plate portion and rake 212b constitute footpath of the present invention direction portion.In addition, the clutch pushing 212d of portion constitutes outside diameter of the present invention footpath direction portion, and is set to be contacted with multiplate clutch 204 planarly.
The 213b of footpath direction portion that stiffening ring 213 has the 213a of axle direction portion, extends to outside diameter from footpath direction portion 231 side ends of the housing 203 of the 213a of axle direction portion.
And by the 213a of axle direction portion being embedded in the periphery of the 212c of urceolus portion of piston only 212, thereby stiffening ring 213 is by the chimeric piston only 212 that is assemblied in.Be assemblied in after the piston only 212 stiffening ring 213 is chimeric, in stiffening ring 213 and piston only 212, in the footpath of axle direction and housing 203 direction portion 231 sides, hot sticky (integrally formed) piston seal 214.At this, stiffening ring 213 constitutes stiffening element of the present invention.And stiffening ring 213 also can be in piston only 212 by welded and installed.
Periphery sealing lip 214a tiltedly extends to outside diameter and to 231 inclinations of the footpath of housing 203 direction portion from the external diameter end of the 213b of footpath direction portion of stiffening ring 213, in addition, interior all sealing lip 214b tiltedly extend to internal side diameter and to 231 inclinations of the footpath of housing 203 direction portion from inner cylinder portion 212e.
Like this, between piston 211 and housing 203, form the X of pressure chamber by periphery sealing lip 214a and interior all sealing lip 214b.
In addition, practise physiognomy over the ground at the outer circumferential side of live axle 202, be provided with and limited axial mobile spring stop 208 as the ring-type limiting part with piston 211.This spring stop 208 is sheet metal (for example SAPH440) metal rings, is set at respect to live axle 202 loading and unloading internal diameter freely, utilizes block 209 restrictive axes directions, the moving away from the direction of piston 211 that be restriction particularly.
And the external diameter of spring stop 208 is littler than the internal diameter of the 212c of urceolus portion of piston 211.
And, between spring stop 208 and piston 211, be provided with a plurality of springs 210, as the deceleration loading device that piston 211 is loaded to the direction away from spring stop 208 at circumferencial direction.And live axle 202 is provided with the oil pressure supply passage 222 that is communicated with the X of pressure chamber.
In above-mentioned structure, when line pressure does not act on the X of pressure chamber, the loading force of spring 210 acts on piston element 211, so the block 214c of piston seal 214 (engagement protrusion such as location) is contacted with the footpath direction portion 231 of housing 203, piston 211 remains static.
In addition, when the oil pressure supply passage 222 by live axle 202 acts on the X of pressure chamber with oil pressure P, when pressure rises, the loading force that piston element 211 overcomes spring 210 is multiplate clutch 204 side shiftings axially, with the clutch pushing 212d of the portion pushing multiplate clutch 204 of piston 211, thus transferring power.
And, when the transmission of removing power, the pressure feed of closing pressure chamber X, the loading force that utilizes spring 210 is with piston 211 footpath direction portion 231 side shiftings of housing 203 axially.Thus, piston 211 is got back to original position.
As above explanation, in the present embodiment, by the clutch pushing 212d of portion is set in the mode that is contacted with multiplate clutch 204 planarly, the R portion as in the past piston midship section U word shape portion of can suppressing be contacted with the situation of multiplate clutch, contact pressure uprises and generation face is pressed and changed.
And, the 213a of axle direction portion by the stiffening ring 213 that will be arranged in 212 minutes with piston only, be embedded in the 212c of urceolus portion of piston only 212, can make the intensity of the clutch pushing 212d of portion become big, so can suppress effectively further that contact pressure uprises and generation face is pressed and changed.
And, owing to can make the intensity of clutch push part 212d become big, thus can further make the size of the planar section of the clutch pushing 212d of portion become big, thus can suppress effectively further that contact pressure uprises and generation face is pressed and changed such shortcoming.
And, uprise owing to can suppress contact pressure, so can suppress because long-term or long-time use wearing and tearing and distortion become big.In addition owing to can suppress generation face and press to change, can suppress to change the aging of the clutch characteristics that produces because face is pressed.So, the dynamic problem that can suppress to produce in the past and worried.
In addition, piston 211 is not owing to be the piston that such in the past having is difficult to make the section U word shape portion of ring, so the process number change of the system ring that not have in the past to be worried is many, be easy to generate crackle, can not implement the such problem of R portion visual examination of section U word shape portion fully in the R portion of section U word shape portion.And,, can realize the raising and the cost degradation of operating efficiency owing to suppress the increase of the process number of system ring.
In addition, piston 211 is owing to be not the piston that such in the past having is present in the narrow gap of section U word shape portion, so can be used to guarantee the cleaning of the bond strength of binder fully.So, can suppress the bonding insufficient of rubber-like elastic body and produce situation about peeling off.
In addition, piston 211 is not owing to have section U word shape portion, so will rubber-like elastic body do not flow into the paddy portion of section U word shape portion, needn't need in the past the rubber-like elastic body of excess quantity like that.In addition, because rubber-like elastic body can not flow into the such recess of paddy portion of section U word shape portion, become the situation of bad shaping so can suppress rubber-like elastic body not flow into well.
In addition, the 213a of axle direction portion of the stiffening ring 213 that forms respectively with piston only 212 utilizes the clutch pushing 212d of portion of piston only 212 and locatees.Thus, can easily determine stiffening ring 213 is embedded in relative position (chimeric with what kind of degree) under the situation of piston only 212, so can realize the raising of operation.In addition, the 213a of axle direction portion by making stiffening ring 213 and the clutch pushing 212d of portion of piston only 212 contact, and can further stablize the sealability of periphery sealing lip 214a.
And the 213a of axle direction portion by making stiffening ring 213 and the clutch pushing 212d of portion of piston only 212 contact, the pushing force in the time of can stable plunger 211 pushing multiplate clutches 204.So the clutch pushing 212d of the portion more stably planar multiplate clutch 204 that is contacted with that becomes can suppress more effectively that contact pressure uprises, generation face is pressed and changed.Thus, can make the more stable work of automatic transmission.
In addition, in the prior art, be provided with in urceolus portion under the situation of sealing lip, when piston 211 when axle direction moves owing to be the action of the urceolus portion of cause to follow the mobile distortion that is produced etc., it is unstable that the sealability of sealing lip becomes possibly.In the present embodiment, the 213a of axle direction portion of the stiffening ring 213 that will be provided with respectively with piston only 212 is embedded in the 212c of urceolus portion of piston only 212, can make the intensity of the telescoping part of 213a of axle direction portion and the 212c of urceolus portion become big thus.So, can make the sealability of the periphery sealing lip 214a that is arranged at stiffening ring 213 stable.
In addition, the length of the 213a of axle direction portion by the stiffening ring 213 that will be provided with respectively with piston only 212 and the 212c of the urceolus portion tabling part of piston only 212 is made as longer, the intensity that is contacted with the clutch pushing 212d of portion of multiplate clutch 204 can be become bigger planarly, perhaps can make the sealability of periphery sealing lip 214a more stable.
(mode of execution 5)
Fig. 6 is that the general structure of the piston 221 of expression embodiment of the present invention 5 partly cuts open figure.And, for the partly additional identical label of above-mentioned mode of execution 4 identical construction, and omit its explanation.At this, in piston 221, as shown in Figure 6, block (engagement protrusion such as location) 212f is arranged at the 212a of end plate portion, and this block (engagement protrusion such as location) 212f makes piston 221 become state of rest by the footpath direction portion 231 that is contacted with housing 203.
In mode of execution 4, be after stiffening ring 213 is embedded in piston only 212, integrally formed piston seal 214, but in the present embodiment, be that the stiffening ring 213 that will be formed with periphery sealing lip 214a again is embedded in piston only 212 after periphery sealing lip 214a is integrally formed in stiffening ring 213.
In the present embodiment, owing to be, so can be with the amount formation sealing lip of still less rubber-like elastic body with the chimeric piston onlies 212 that are assemblied in periphery sealing lip 214a and stiffening ring 213 integrally formed backs.In addition, as shown in the figure, by forming chimeric position with piston only 212 with rubber-like elastic body at the 213a of axle direction portion of stiffening ring 213, thereby can make the inlay resultant force of stiffening ring 213 and piston only 212 stable, in addition needn't the cooperation between metal ring arrowhead tolerance strictly.
At this, interior all sealing lip 214b are preferably integrally formed with piston only 212, but as the device of the annular gap of the outer circumferential face of packed-piston body 212 and live axle 202, are not limited to interior all sealing lip 214b.For example, at the outer circumferential face of live axle 202 (groove) O-ring seals is set, this O-ring seals is sealed the axle direction portion that is arranged at inner cylinder portion 212e of being contacted with (be set to axle direction roughly the part of straight line shape) with being free to slide, such formation is also passable.In this case, will rubber-like elastic body and piston only 212 unitary mouldings, so can reach the attenuatingization and the cost degradation of manufacturing process.
Claims (6)
1. piston is characterized in that having:
Piston only, this piston only moves on axle direction and is arranged at freely in the annular aperture, has footpath direction portion, side axle direction portion of extending and the outside diameter that extends to outside diameter from the end of axle direction one side of this an axle direction portion direction portion directly axially from the external diameter end of this footpath direction portion;
Stiffening element, this stiffening element are arranged at the periphery of the above-mentioned axle direction portion of above-mentioned piston only;
Sealed member, the sealing parts are arranged on the above-mentioned stiffening element, have the sealing lip of the outer circumferential face side of the above-mentioned annular aperture of sealing;
Wherein above-mentioned stiffening element has the outer circumferential face of the axle direction portion that spreads all over piston only and/or spreads all over the roughly Zone Full of end face of axle direction opposite side of outside diameter footpath direction portion and section 1 of extending and the part 2 that extends to the root of above-mentioned sealing lip from the front end of this section 1.
2. piston as claimed in claim 1 is characterized in that, above-mentioned stiffening element is located in the above-mentioned outside diameter footpath direction portion of above-mentioned piston only, and is entrenched on the Zone Full of above-mentioned axle direction portion.
3. piston as claimed in claim 1 is characterized in that, at above-mentioned piston only axially under the situation of a side shifting, above-mentioned outside diameter footpath direction portion pushes near the splenium that is pushed the outer circumferential face that is arranged at above-mentioned annular aperture planarly.
4. piston as claimed in claim 2 is characterized in that, at above-mentioned piston only axially under the situation of a side shifting, above-mentioned outside diameter footpath direction portion pushes near the splenium that is pushed the outer circumferential face that is arranged at above-mentioned annular aperture planarly.
5. as each the described piston in the claim 1～4, it is characterized in that,
All side seals in further having, all side seals are set on the above-mentioned piston only in this, seal the inner peripheral surface side of above-mentioned annular aperture,
Above-mentioned sealed member and above-mentioned in all side sealing parts, after above-mentioned stiffening element is embedded in above-mentioned piston only, be formed on chimeric the above-mentioned piston only of above-mentioned stiffening element.
6. as each the described piston in the claim 1～4, it is characterized in that,
Above-mentioned sealed member is formed on the above-mentioned stiffening element,
Above-mentioned stiffening element after having formed above-mentioned sealed member, is embedded in above-mentioned piston only.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004079573A JP2005265073A (en) | 2004-03-19 | 2004-03-19 | Piston device |
| JP079573/2004 | 2004-03-19 | ||
| JP117975/2004 | 2004-04-13 | ||
| JP379319/2004 | 2004-12-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1934366A CN1934366A (en) | 2007-03-21 |
| CN100476228C true CN100476228C (en) | 2009-04-08 |
Family
ID=35089847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800085969A Expired - Fee Related CN100476228C (en) | 2004-03-19 | 2005-03-18 | Piston |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005265073A (en) |
| CN (1) | CN100476228C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007132424A (en) * | 2005-11-10 | 2007-05-31 | Unipres Corp | Hydraulic engaging device and piston molding method for hydraulic engaging device |
| JP5053052B2 (en) * | 2007-11-21 | 2012-10-17 | 光洋シーリングテクノ株式会社 | Piston device and hydraulic cylinder device provided with the same |
| DE112011102722T5 (en) * | 2010-08-18 | 2013-06-27 | Skf Usa Inc. | Seal with pressure-actuated sealing bead |
| CN102562850A (en) * | 2010-12-20 | 2012-07-11 | 陕西航天动力高科技股份有限公司 | Wet clutch |
| US10100881B2 (en) | 2012-11-06 | 2018-10-16 | Nok Corporation | Clutch seal |
| JP7317512B2 (en) * | 2019-01-21 | 2023-07-31 | Nok株式会社 | sealing device |
| WO2021220962A1 (en) * | 2020-05-01 | 2021-11-04 | Nok株式会社 | Identification structure of component of clutch piston mechanism and identification method of component of clutch piston mechanism |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848518A (en) * | 1972-09-14 | 1974-11-19 | Gen Motors Corp | Sheet metal piston for transmissions and method of making a piston assembly |
-
2004
- 2004-03-19 JP JP2004079573A patent/JP2005265073A/en not_active Abandoned
-
2005
- 2005-03-18 CN CNB2005800085969A patent/CN100476228C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848518A (en) * | 1972-09-14 | 1974-11-19 | Gen Motors Corp | Sheet metal piston for transmissions and method of making a piston assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005265073A (en) | 2005-09-29 |
| CN1934366A (en) | 2007-03-21 |
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Granted publication date: 20090408 Termination date: 20100318 |