JP2008014386A - Clutch device of automatic transmission and method of assembling the clutch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure assemblable without damaging a seal member when a lip seal is used as the seal member in the hydraulic chamber of a clutch device of an automatic transmission. <P>SOLUTION: A piston 140 comprises: a pressure receiving part 141; a friction plate pressing part 142 axially offset from the pressure receiving part 141; and a cylindrical connection part 143 connecting them to each other. The seal member 162 supported on a seal member support part 112c extending from the bottom wall part 110c of a clutch drum 110 is brought into slidable contact with the inner peripheral surface of the cylindrical connection part 143. The lip seal is used as the seal member 162. The bottom wall part 110c of the clutch drum 110 is divided into at least two parts, an inner peripheral portion 112 formed by extending the seal member support part 112c and an outer peripheral portion 113 on the outside of the inner peripheral portion. The joining part between the inner and outer peripheral portions is formed on the inner side of the outer peripheral part of the lip seal 162. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a clutch device for an automatic transmission, and belongs to the technical field of an automatic transmission mounted on an automobile.

  An automatic transmission for an automobile is a combination of a torque converter and a transmission gear mechanism, and the power transmission path of the transmission gear mechanism is switched by selective operation of frictional engagement elements such as a plurality of clutches and brakes to obtain a predetermined gear stage. The clutch is configured to automatically shift, but the clutch has a cylindrical portion on the outer peripheral side and a bottom wall portion at one end thereof, and a clutch drum having the other end opened, and a relative position within the clutch drum. A clutch hub disposed rotatably, a plurality of friction plates disposed between the clutch drum and the clutch hub and alternately engaged with the clutch hub, and pressing and fastening the friction plates The piston comprises a piston that couples the clutch drum and the clutch hub, and a hydraulic chamber that is supplied with hydraulic pressure that applies a pressing force to the piston.

  In this case, the piston is housed in the inner part of the clutch drum, and the hydraulic chamber is formed between the inner surface of the drum bottom wall and the back surface of the piston, and the outer periphery of the hydraulic chamber is sealed. A member is mounted.

  A configuration of a clutch device provided with such a seal member is disclosed in Patent Document 1. In this clutch device, the piston includes an inner pressure receiving portion that defines a hydraulic chamber, an outer friction plate pressing portion that is axially offset from the pressure receiving portion to the bottom wall side of the clutch drum, and the pressure receiving portion. And a cylindrical connecting part that connects the pressing part, and a seal member support part extending from the bottom wall part of the clutch drum so as to protrude inside the cylindrical connecting part of the piston. As a sealing member that seals, an O-ring that is in sliding contact with the inner peripheral surface of the cylindrical coupling portion of the piston is mounted on the outer periphery of the support portion.

  According to this configuration, the seal portion around the outside of the hydraulic chamber is disposed closer to the opening side of the clutch drum than the friction plate pressing portion of the piston. The directional dimension will be shortened.

JP 2001-50301 A

  By the way, when an O-ring is used as a sealing member for sealing the periphery of a hydraulic chamber as in the clutch device described in Patent Document 1, if an attempt is made to ensure a sufficient sealing performance with respect to a predetermined hydraulic pressure, sliding occurs. As the resistance increases and the variation in the sliding resistance increases, the response of the piston to the supply and discharge of hydraulic pressure and the stability of the operation are deteriorated, which hinders finer control of the shift control.

  To cope with this, it is conceivable to employ a lip seal that has a low sliding resistance and that provides a high sealing performance when the tip lip is pressed against the sliding surface by the hydraulic pressure in the hydraulic chamber. However, like the clutch device of Patent Document 1, a seal member support portion is extended on the bottom wall portion of the clutch drum, and a seal member that is in sliding contact with the inner peripheral surface of the cylindrical connecting portion of the piston is mounted on the outer periphery thereof. In this case, the use of the lip seal may cause the following problems.

  That is, as shown in FIG. 10, the seal member support A2 is provided on the bottom wall A1 of the clutch drum A, and the seal member B mounted on the support A2 is pressed between the pressure receiving part C1 of the piston C and the friction plate. When the lip seal is used as the seal member B in the configuration in which the outer periphery of the pressure receiving chamber D is sealed by being brought into sliding contact with the inner peripheral surface of the cylindrical connecting portion C3 between the portion C2 and the outer peripheral lip The tip of the part B1 will be mounted facing the piston C side. In this case, when the piston C is to be assembled into the clutch drum A with the lip seal B mounted in advance on the support part A2, The tip of the lip part B1 is caught in the cylindrical connecting part C3 of the piston C and the corner part C 'of the pressing part C2, or is not smoothly inserted into the connecting part C3. To damage It is from occurring.

  In that case, as shown in the figure, even if the corner portion C ′ is chamfered, the problem cannot be completely avoided. After all, in the clutch device having such a configuration, the outer periphery of the hydraulic chamber is provided. It has become difficult to use lip seals.

  Therefore, an object of the present invention is to enable the use of a lip seal as a seal member for sealing the outer periphery of a hydraulic chamber in the clutch device configured as described above.

  In order to solve the above problems, the present invention is configured as follows.

  First, the invention according to claim 1 of the present application is a clutch drum having a cylindrical portion on the outer peripheral side and a bottom wall portion at one end thereof, a clutch hub disposed in the clutch drum so as to be relatively rotatable, and the clutch drum. A plurality of friction plates that are disposed between the clutch hub and the clutch hub, and a piston that connects the clutch drum and the clutch hub by pressing and fastening the friction plates; A hydraulic chamber that is supplied with hydraulic pressure that applies a pressing force to the piston, and the piston includes an inner pressure receiving portion that defines the hydraulic chamber, and the pressure receiving portion toward the clutch drum bottom wall side. An outer peripheral friction plate pressing portion offset in the axial direction, and a cylindrical connecting portion that connects the pressure receiving portion and the pressing portion, and from the bottom wall portion of the clutch drum to the cylindrical connecting portion of the piston. Rush inside The automatic transmission is configured such that a seal member support portion is extended and the seal member supported by the support portion is in sliding contact with the inner peripheral surface of the cylindrical coupling portion to seal the outer periphery of the pressure receiving chamber. In this clutch device, the seal member is a lip seal in which an outer peripheral portion slidably contacting an inner peripheral surface of the cylindrical coupling portion of the piston is a lip portion directed to a pressure receiving portion side of the piston, and the clutch drum The seal member support part is divided into at least two parts, an inner peripheral part and an outer peripheral part, and the joint part is provided inside the outer peripheral part of the lip seal.

  According to a second aspect of the present invention, in the clutch device for an automatic transmission according to the first aspect, the connecting portion between the inner peripheral portion and the outer peripheral portion of the clutch drum has an axial thickness that is the bottom wall portion of the drum. It is thicker than other portions, and is provided so as to overlap the cylindrical connecting portion of the piston in the axial direction.

  According to a third aspect of the present invention, in the clutch device for an automatic transmission according to the second aspect, the inner peripheral portion of the outer peripheral portion constituting the coupling portion of the clutch drum is a cylindrical connecting portion of the piston. It is made into the cylinder shape extended inside.

  Further, the invention according to claim 4 is the clutch device for an automatic transmission according to any one of claims 1 to 3, wherein the coupling portion of the clutch drum is provided on the outer periphery of the inner peripheral portion. It is comprised by the spline which consists of an external tooth and the internal tooth provided in the inner periphery of the outer peripheral part.

  According to a fifth aspect of the present invention, in the clutch device for an automatic transmission according to any one of the first to fourth aspects, an inner peripheral portion is provided at a central portion in the axial direction of the coupling portion of the clutch drum. And a locking member that prevents relative movement in the axial direction between the outer peripheral portion and the outer peripheral portion.

  On the other hand, the invention described in claim 6 is a clutch drum having a cylindrical portion on the outer peripheral side and a bottom wall portion at one end thereof, a clutch hub disposed in the clutch drum so as to be relatively rotatable, and the clutch drum and the clutch. A plurality of friction plates disposed between and alternately engaged with the hub; a piston for coupling the clutch drum and the clutch hub by pressing and fastening the friction plates; and the piston A hydraulic chamber to which a hydraulic pressure is applied to apply a pressing force to the piston, and the piston has an inner pressure receiving portion that defines the hydraulic chamber, and an axial direction from the pressure receiving portion toward the clutch drum bottom wall side A friction plate pressing portion on the outer peripheral side that is offset to the cylinder, a cylindrical connecting portion that connects the pressure receiving portion and the pressing portion, and from the bottom wall portion of the clutch drum to the inside of the cylindrical connecting portion of the piston. Rushing seal A material support portion is extended, and a lip portion directed to the piston pressure receiving portion side of the lip seal supported by the support portion is in sliding contact with the inner peripheral surface of the cylindrical connecting portion to seal the outer periphery of the pressure receiving chamber. In addition, the clutch drum is divided into at least two parts, an inner peripheral part where the seal member support part is extended and an outer peripheral part thereof, and the coupling part is provided inside the outer peripheral part of the lip seal. In the assembling method of the clutch device of the transmission, before the inner peripheral portion and the outer peripheral portion of the clutch drum are coupled, the lip seal is directed to the seal member support portion of the inner peripheral portion, and the lip portion is directed to the piston pressure receiving portion side. Next, the inner peripheral portion of the clutch drum is inserted from the bottom wall portion side into a jig having an outer peripheral wall having an inner diameter substantially equal to the inner diameter of the cylindrical connecting portion of the piston. In this state, the end face of the jig and the end face of the piston are brought into contact so that the inner peripheral face of the outer peripheral wall of the jig is continuous with the inner peripheral face of the cylindrical connecting portion of the piston. In addition, the lip portion of the lip seal is guided along the inner peripheral surface of the outer peripheral wall of the jig into the inner peripheral surface of the cylindrical connecting portion, and the lip portion contacts a predetermined position on the inner peripheral surface of the cylindrical connecting portion. After the clutch drum inner peripheral portion and the piston are brought close to each other, the outer peripheral portion is coupled to the clutch drum inner peripheral portion.

  With the above configuration, according to each invention of the present application, the following effects can be obtained.

  First, according to the first aspect of the invention, the piston is offset in the axial direction by the friction plate pressing portion on the outer peripheral side with respect to the inner pressure receiving portion defining the hydraulic chamber toward the bottom wall side of the clutch drum. The seal member support portion extending from the bottom wall portion of the clutch drum is inserted into the cylindrical connecting portion that connects the two portions, and is in sliding contact with the inner peripheral surface of the cylindrical connecting portion. Since the seal member is supported, the axial dimension of the clutch device as a whole is shortened compared to the case where a seal portion for sealing the outer periphery of the hydraulic chamber is provided on the outer periphery of the friction plate pressing portion of the piston.

  In such a configuration, the clutch drum is divided into at least two parts, namely, an inner peripheral part where the seal member support portion is extended and an outer peripheral part thereof. Therefore, before the outer peripheral part is joined to the inner peripheral part, A lip seal can be attached to the support portion of the inner peripheral portion.

  In this case, the lip seal is attached in a direction in which the outer lip portion faces the piston side, and is inserted into the cylindrical connecting portion of the piston in this state. Can be performed before the portion is joined to the inner peripheral portion, and the joint portion between the inner peripheral portion and the outer peripheral portion of the clutch drum is provided inside the lip portion on the outer periphery of the lip seal. It is possible to use a jig for reducing the diameter from the back of the part.

  As a result, when the piston is assembled to the clutch drum, when the lip portion of the lip seal is inserted inside the cylindrical connecting portion of the piston, the lip portion is caught at the corner portion between the connecting portion and the friction plate pressing portion. Therefore, the lip can be prevented from being damaged.

  According to the second aspect of the present invention, the connecting portion between the inner peripheral portion and the outer peripheral portion of the clutch drum is thicker in the axial direction than other portions of the drum bottom wall portion, and the piston Since it is provided so as to overlap with the cylindrical connecting portion in the axial direction, the axial dimension of the coupling portion can be increased by effectively using the space inside the cylindrical connecting portion.

  Therefore, while avoiding an increase in the axial dimension of the clutch device as a whole, the inner peripheral portion and the outer peripheral portion of the clutch drum are firmly coupled, and the outer peripheral portion is collapsed with respect to the inner peripheral portion or between the two. Shaking or the like is prevented.

  According to the invention described in claim 3, since the inner peripheral portion of the outer peripheral portion constituting the coupling portion of the clutch drum is formed into a cylindrical shape extending inward of the cylindrical connecting portion of the piston, the shaft of the clutch drum is It is possible to sufficiently secure the axial dimension of the coupling portion without increasing the directional dimension.

  Furthermore, according to the invention described in claim 4, since the coupling portion of the clutch drum is configured by a spline, the inner circumferential portion and the outer circumferential portion can be easily coupled, and rattling in the rotation direction can occur. It is suppressed.

  According to the fifth aspect of the present invention, the locking member for preventing the relative movement in the axial direction between the inner peripheral portion and the outer peripheral portion is provided at the central portion in the axial direction of the coupling portion of the clutch drum. Therefore, it is possible to prevent the outer peripheral portion from moving in the axial direction with respect to the inner peripheral portion and, for example, the bottom wall portion of the clutch drum from interfering with the member behind.

  On the other hand, according to the invention described in claim 6, since the piston is assembled to the inner peripheral portion of the clutch drum on which the lip seal is mounted in a state where the diameter of the lip portion of the lip seal is reduced by the jig, the lip seal The lip portion is smoothly inserted without being caught inside the cylindrical coupling portion of the piston, and damage to the lip portion is prevented.

  Embodiments of the present invention will be described below.

  First, the overall mechanical configuration of the automatic transmission 1 according to the present embodiment will be described with reference to FIG. 1. The automatic transmission 1 is applied to a horizontal engine, and the main component is an engine. It has a driven torque converter 10 and a transmission mechanism 20 to which the output rotation of the torque converter 10 is input. The output rotation of the transmission mechanism 20 is input to the differential device 60 via the intermediate transmission mechanism 50. It is like that.

  The torque converter 10 includes a case 11 connected to the engine output shaft 2, a pump 12 fixed in the case 11, and a pump 12 disposed facing the pump 12 via hydraulic oil. A turbine 13 to be driven, a stator 15 interposed between the pump 12 and the turbine 13 and supported by the transmission case 3 via a one-way clutch 14 to increase torque, and the case 11 The lockup clutch 16 is provided between the turbine 13 and directly connects the engine output shaft 2 and the turbine 13 via the case 11. The rotation of the turbine 13 is output to the transmission mechanism 20 via the turbine shaft 17.

  An oil pump 18 that is driven by the engine output shaft 2 via a case 11 of the torque converter 10 is disposed on the opposite side of the torque converter 10 from the engine.

  The transmission mechanism 20 includes a first planetary gear mechanism 21 disposed on the torque converter 10 side, a second planetary gear mechanism 22 disposed on the anti-torque converter 10 side, and a third planetary gear mechanism 22 disposed therebetween. The fourth planetary gear mechanisms 23 and 24 are arranged in order from the torque converter 10 side as a plurality of friction elements such as clutches and brakes for switching the power transmission path composed of the planetary gear mechanisms 21 to 24. Further, the first to third clutches 31 to 33 and the first and second brakes 41 and 42 are also provided so that forward 1st to 6th speed and reverse speed can be obtained.

  The first to fourth planetary gear mechanisms 21 to 24 all support the sun gears 21a to 24a, the plurality of pinions 21b to 24b respectively engaged with the sun gears 21a to 24a, and the pinions 21b to 24b. The carrier 21c-24c and ring gears 21d-24d meshed with the pinions 21b-24b are configured.

  In the first planetary gear mechanism 21, the sun gear 21a is fixed to the transmission case 3, the carrier 21c is connected to the drum side of the first clutch 31, and the ring gear 21d is connected to the turbine shaft 17 and the drum side of the second clutch. ing.

  In the second planetary gear mechanism 22, the sun gear 22 a is fixed to the transmission case 3, the ring gear 22 d is connected to the turbine shaft 17, and the carrier 22 c is connected to the drum side of the third clutch 33.

  In the third planetary gear mechanism 23, the sun gear 23a is connected to the hub side of the third clutch 33 and the second brake 42, and the carrier 23c is connected to the hub side of the second clutch 32 and the first brake 41. The ring gear 23d is connected to the carrier 24c of the fourth planetary gear mechanism 24.

  Further, in the fourth planetary gear mechanism 24, the sun gear 24a is connected to the hub side of the first clutch 31, the ring gear 24d is connected to the carrier 23c of the third planetary gear mechanism 23, and is connected to the first brake 41, A carrier 24 c is coupled to the ring gear 23 d of the third planetary gear mechanism 23 and coupled to the output gear 25 to the intermediate transmission mechanism 50.

  The rotation of the output gear 25 is input to the differential device 60 via the intermediate transmission mechanism 50 and drives the left and right axles 61 and 62.

  Here, the relationship between the operating states of the clutches 31 to 33 and the brakes 41 and 42 and the shift speed is shown in Table 1.

  Next, the configuration of the first clutch 31 and its surroundings, which are characteristic parts of the present invention, will be described in detail.

  As shown in FIG. 2, the oil pump 18 is fixed between the transmission case 3 and the torque converter housing 4 so as to partition the two, and the anti-torque converter 10 is provided from a cover 18 a of the oil pump 18. A first clutch 31 is disposed on a sleeve (hereinafter referred to as “pump cover sleeve”) 18 b extending to the side.

  A sun gear 21a of the first planetary gear mechanism 21 is splined to the tip of the pump cover sleeve 18b, and the turbine shaft 17 passes through the sleeve 18b and protrudes from the sleeve 18b of the shaft 17. The ring gear 21d of the first planetary gear mechanism 21 is connected to the thus-formed portion via a disk-like connecting member 71.

  As shown in an enlarged view in FIG. 3, the first clutch 31 includes a clutch drum 110 rotatably supported on the pump cover sleeve 18 b, and a relative to the inner side of the drum 110 concentrically with the drum 110. And a cylindrical clutch hub 120 rotatably arranged.

  The clutch drum 110 includes an inner peripheral cylindrical portion 110a, an outer peripheral cylindrical portion 110b, and a bottom wall portion that connects both cylindrical portions 110a and 110b at the end of the torque converter 10 (hereinafter referred to as “front side”). 110c, and an end portion on the opposite side (hereinafter referred to as "rear side") of the bottom wall portion 110c is opened.

  The inner peripheral surface of the outer peripheral side cylindrical portion 110b of the clutch drum 110 and the outer peripheral surface of the clutch hub 120 opposite to the inner peripheral surface are formed with splines of inner teeth and outer teeth, respectively. A plurality of friction plates 131... 131 having teeth and a plurality of friction plates 132... 132 having teeth on the inner peripheral side are alternately engaged, and the friction plates 131 and 132 are arranged in an array. A dish plate 133 for buffering when the clutch is engaged is mounted on the front side, and a snap ring 134 for retaining is mounted on the rear side.

  Here, the clutch drum 110 includes a cylindrical inner peripheral member 111 constituting the inner peripheral side cylindrical portion 110a fitted to the pump cover sleeve 18b, and a bottom wall inner periphery constituting the inner peripheral portion of the bottom wall portion 110c. It is comprised by the member 112 and the outer peripheral member 113 which comprises the outer peripheral part of the bottom wall part 110c, and the outer peripheral side cylindrical part 110b. The cylindrical inner peripheral member 111 and the bottom wall inner peripheral member 112 are coupled and integrated by welding.

  On the other hand, at the connecting portion between the bottom wall inner peripheral member 112 and the outer peripheral member 113, a thick portion 112a having a thickness increased in the axial direction is provided on the former outer peripheral portion, and the latter inner peripheral portion extends rearward. A cylindrical portion 113a is provided, and the bottom wall inner peripheral member 112 and the outer peripheral member 113 are spline-coupled by engaging external teeth provided on the thick wall portion 112a with internal teeth provided on the cylindrical portion 113a. . And the snap ring 114 is attached to the circumferential grooves 112b and 113b provided corresponding to the teeth of the splines on both sides, and the relative movement in the axial direction of both members 112 and 113 is prevented.

  A carrier 21c of the first planetary gear mechanism 21 is engaged with the rear end portion of the cylindrical inner peripheral member 111, and these rotate integrally.

  Further, the first clutch 31 is provided with a piston 140 that presses the friction plates 131 and 132 and fastens the clutch 31. The piston 140 includes an inner pressure receiving portion 141 that forms a hydraulic chamber 150 between the inner peripheral portion (bottom wall inner peripheral member 112) of the bottom wall portion 110c of the clutch drum 110, and the pressure receiving portion 141. It has an outer peripheral friction plate pressing portion 142 that is axially offset to the front side, and a cylindrical connecting portion 143 that connects the pressure receiving portion 141 and the pressing portion 142.

  The inner lip seal 161 attached to the circumferential groove 111a of the cylindrical inner circumferential member 111 is slidably contacted with the inner circumferential surface of the pressure receiving portion 141, and the thickness of the bottom wall inner circumferential member 112 of the clutch drum 110 is increased. A seal member support portion 112c is provided at the rear end of the meat portion 112a, and an outer lip seal 162 is mounted in a circumferential groove 112d provided in the support portion 112c, so that the inner periphery of the cylindrical coupling portion 143 of the piston 140 is provided. It is in sliding contact with the surface. As a result, the inner and outer periphery of the hydraulic chamber 150 is sealed.

  In this case, the lip seals 161 and 162 are formed so that the outer lip portions 161a and 162a receive the hydraulic pressure in the hydraulic chamber 150 and are pressed against the sliding contact surfaces. The front end is directed to the front side, and the lip 162a of the outer lip seal 162 is mounted so that the front end is directed to the rear side.

  Then, with respect to the hydraulic chamber 150 whose inner and outer peripheries are sealed by these lip seals 161 and 162, the clutch drum cylindrical inner peripheral member 111 is provided from an oil passage 18 c (see FIG. 2) provided in the oil pump cover 18. Hydraulic pressure is supplied through the oil path 111b.

  Further, the first clutch 31 has a return spring 170 that urges the piston 140 in a direction opposite to the direction in which the hydraulic pressure supplied to the hydraulic chamber 150 is applied, that is, in the clutch release direction. The front end of the spring 170 is received by the surface of the piston 140 on the side opposite to the hydraulic chamber 150 of the pressure receiving portion 141, and the rear end is fixed to the rear end portion of the clutch drum cylindrical inner peripheral member 111 using a snap ring 181. Is supported by the spring receiving disk 180 formed.

  A space between the spring receiving disc 180 and the pressure receiving portion 141 of the piston 140 is a balance chamber 190, and a seal member 182 attached to the outer peripheral portion of the disc 180 is a cylindrical connecting portion 143 of the piston 140. The balance chamber 190 is sealed in sliding contact with the inner peripheral surface of a cylindrical extension 144 extending rearward. An oil passage 18d provided in the pump cover sleeve 18b and an oil passage provided in the clutch drum cylindrical inner peripheral member 111 from an oil passage 17a (see FIG. 2) provided in the turbine shaft 17 to the balance chamber 190. When hydraulic oil is introduced through 111c and hydraulic pressure is not supplied to the hydraulic chamber 150, the force in the clutch fastening direction that acts on the piston 140 due to centrifugal force that acts on the hydraulic oil remaining in the hydraulic chamber 150 is The hydraulic oil introduced into the balance chamber 190 is canceled by the force in the clutch releasing direction due to the centrifugal force of the hydraulic oil.

  The first clutch 31 configured as described above is assembled as follows.

  First, as shown in FIG. 4, with respect to the unit 200 of the cylindrical inner peripheral member 111 and the bottom wall inner peripheral member 112 of the clutch drum 110, which are welded and integrated in advance, inner and outer portions of the peripheral grooves 111a and 112d Lip seals 161 and 162 are attached, respectively. In that case, the lip portion 161a of the inner lip seal 161 is mounted with the front end facing forward, and the lip portion 162a of the outer lip seal 162 is mounted facing rearward. In addition, a snap ring 114 for coupling with the outer peripheral member 113 is mounted in advance in a spline peripheral groove 112b provided in the thick portion 112a of the outer peripheral portion of the bottom wall inner peripheral member 112.

  Thus, the unit 200 to which various members are attached is assembled to the jig X in which the annular recess X4 is formed by the inner peripheral wall X1, the outer peripheral wall X2, and the bottom wall X3 connecting one end side thereof. The outer diameter d1 of the inner peripheral wall X1 of the jig X is substantially equal to the inner diameter of the unit 200, that is, the inner diameter of the cylindrical inner peripheral member 112 of the clutch drum 110, and the inner diameter d2 of the outer peripheral wall X2 is The outer diameter of the outer lip seal 162 attached to the outer peripheral portion is substantially equal to the outer diameter of the lip portion 162a in pressure contact with the sliding contact surface, and the depth d of the outer peripheral portion of the recess X4 The depth is such that the lip 162a of the lip seal 162 enters the inside of the outer peripheral wall X2 when inserted to the depth of X4.

  A ring-shaped auxiliary jig Y is detachably fitted on the outer periphery of the jig X. One end side of this auxiliary jig Y (opening side of the recess X4 of the jig X) is provided with a conical guide surface Y1 whose diameter decreases in the assembling direction x of the unit 200, and the surface Y1 has the smallest diameter. The edge portion is continuous with the inner peripheral surface X2 ′ of the outer peripheral wall X2 of the jig X.

  Then, with the auxiliary jig Y attached to the jig X, the unit 200 is incorporated into the recess X4 of the jig X as indicated by the arrow x. The lip 162a of the attached lip seal 162 abuts against the conical guide surface Y1 of the auxiliary jig Y from the back surface, and the diameter is gradually reduced along the guide surface Y1. Then, after being sufficiently reduced in diameter, it is guided into the inner peripheral surface X2 ′ of the outer peripheral wall of the jig X.

  Next, as shown in FIG. 5, the auxiliary jig B is removed, and the piston 140 is moved in the y direction toward the opening-side end face of the recess X4 of the jig X, and is applied in a predetermined positional relationship. At this time, since the outer peripheral wall inner diameter d2 of the jig X is substantially equal to the diameter of the inner peripheral surface of the cylindrical connecting portion 143 in the piston 140, the outer peripheral wall inner peripheral surface of the jig X and the cylinder of the piston 140 are arranged. The inner peripheral surface of the cylindrical portion 143 is continuous.

  Therefore, as shown in FIG. 6, if the unit 200 is taken out from the recess X4 of the jig X in this state and moved in the z direction to the inside of the cylindrical coupling portion 143 of the piston 140, the lip portion 162d of the lip seal 162 is obtained. In this state, the lip 162a whose tip is directed to the piston 140 side is transferred to the inner peripheral surface of the cylindrical connecting portion 143 while the tip of the piston 140 is reduced in diameter by a predetermined amount. It smoothly contacts the inner peripheral surface of the cylindrical connecting portion 143 without being caught in the corner between the cylindrical connecting portion 143 and the pressing portion 142 or being rolled up.

  At this time, the inner lip seal 161 is slidably contacted with the inner peripheral surface of the pressure receiving portion 141 of the piston 140 to form the hydraulic chamber 150. In the case of the inner lip seal 161, the lip portion 161a extends from the back to the pressure receiving portion. Since it is inserted into the inner peripheral surface of 141, the lip portion 161a is not caught.

  Then, when the unit 200 and the piston 140 are combined in this way, as shown in FIG. 7, the jig X is removed, and the inner peripheral portion of the clutch drum outer peripheral member 113 is moved from the back portion (front side) of the unit 200 to the unit. The outer peripheral portion of 200, that is, the outer peripheral portion of the clutch drum bottom wall inner peripheral member 112 is spline-fitted. As a result, as shown in FIG. 8, the snap ring 114 attached to the peripheral groove 112b of the outer peripheral portion of the bottom wall inner peripheral member 112 is engaged with the peripheral groove 113b of the inner peripheral portion of the outer peripheral member 113, Are completely spline-coupled to prevent relative movement or disconnection in the axial direction, and the entire clutch drum 110 is integrated.

  In that case, the outer peripheral portion of the bottom wall inner peripheral member 112 constituting the coupling portion is a thick portion 112a that is thicker in the axial direction than the other portions, and the inner peripheral portion of the outer peripheral member 113 is Is provided with a cylindrical portion 113a extending inward of the cylindrical coupling portion 143 of the piston 140, and the spline coupling portion is formed because the thick-walled portion 112a and the cylindrical portion 113a are formed with spline external teeth and internal teeth. It is possible to secure a sufficient dimension in the axial direction while effectively using the space inside the cylindrical coupling portion 143 of the piston 140, and thus avoiding an increase in the axial dimension of the clutch 31 The outer peripheral member 113 is prevented from falling or rattling with respect to the wall inner peripheral member 112, and a firm connection of the connecting portion is realized.

  FIG. 9 shows another embodiment of the present invention. In the first clutch 31 ′ according to this embodiment, the outer peripheral portion of the bottom wall inner peripheral member 112 ′ constituting the clutch drum 110 ′ is shown. A hollow disk-like seal member support member 112b 'is welded to the rear end of the thick portion 112a' on which spline external teeth are formed, and is attached to the outer lip seal 162 'on the outer periphery thereof.

  Also in this embodiment, the clutch drum 110 'is divided into the bottom wall inner peripheral member 112' and the outer peripheral member 113 ', and these two members 112' and 113 'are separated from the lip 162a' of the lip seal 162 '. Since it is the structure which carries out spline coupling | bonding inside, the effect | action similar to the said embodiment is acquired.

  As described above, according to the present invention, as a clutch device for an automatic transmission, a compact and stable device with low piston sliding resistance can be realized, and therefore shift control can be performed with high accuracy. Thus, the present invention is suitably used in the field of manufacturing automobile automatic transmissions.

1 is a skeleton diagram showing an overall mechanical configuration of an automatic transmission according to an embodiment of the present invention. It is sectional drawing of the torque converter side part of a transmission mechanism. It is an expanded sectional view of the 1st clutch. It is explanatory drawing of the 1st process at the time of clutch drum assembly. It is explanatory drawing of a 2nd process as well. It is explanatory drawing of a 3rd process as well. It is explanatory drawing of a 4th process as well. It is explanatory drawing of a clutch drum assembly completion state. It is sectional drawing of the 1st clutch which concerns on other embodiment. It is explanatory drawing of the conventional problem.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic transmission 31 1st clutch 110 Clutch drum 110b Bottom wall part 110c Outer peripheral side cylindrical part 112 Inner peripheral part (bottom wall inner peripheral member)
112c Seal member support part 113 Outer peripheral part (outer peripheral member)
120 Clutch hub 131, 132 Friction plate 140 Piston 141 Pressure receiving part 142 Pressing part 143 Tubular connecting part 162 Lip seal 162a Lip part X, Y Jig

Claims (6)

A clutch drum having an outer cylindrical portion and a bottom wall portion at one end thereof; a clutch hub disposed in the clutch drum so as to be relatively rotatable; and disposed between the clutch drum and the clutch hub. A plurality of alternately engaged friction plates, a piston for connecting the clutch drum and the clutch hub by pressing and fastening the friction plates, and hydraulic pressure for applying a pressing force to the piston are supplied. And having a hydraulic chamber,
The piston includes an inner pressure receiving portion that defines the hydraulic chamber, an outer friction plate pressing portion that is axially offset from the pressure receiving portion toward the clutch drum bottom wall, and the pressure receiving portion and the pressing portion. And a cylindrical connecting part for connecting
Further, a seal member support portion that protrudes from the clutch drum bottom wall portion to the inside of the cylindrical connection portion of the piston is extended, and the seal member supported by the support portion is formed on the inner peripheral surface of the cylindrical connection portion. In the clutch device of the automatic transmission configured to seal and seal the outer periphery of the pressure receiving chamber,
The seal member is a lip seal in which an outer peripheral portion that is in sliding contact with an inner peripheral surface of the cylindrical connecting portion of the piston is a lip portion that faces the pressure receiving portion side of the piston,
In addition, the clutch drum is divided into at least two parts, an inner peripheral part in which a seal member support part is extended and an outer peripheral part thereof,
A clutch device for an automatic transmission, wherein the coupling portion is provided inside the outer peripheral portion of the lip seal. In the clutch device for an automatic transmission according to claim 1,
The coupling portion between the inner peripheral portion and the outer peripheral portion of the clutch drum has an axial thickness that is thicker than other portions of the drum bottom wall,
And the clutch apparatus of the automatic transmission characterized by being provided so that it may overlap with the cylindrical connection part of the said piston in an axial direction. In the clutch device for an automatic transmission according to claim 2,
The clutch device for an automatic transmission, wherein an inner peripheral portion of an outer peripheral portion constituting a coupling portion of the clutch drum is formed in a cylindrical shape extending inward of a cylindrical connecting portion of the piston. In the clutch device of the automatic transmission according to any one of claims 1 to 3,
The clutch part of the automatic transmission is characterized in that the coupling part of the clutch drum is composed of a spline composed of an external tooth provided on the outer periphery of the inner peripheral part and an inner tooth provided on the inner periphery of the outer peripheral part. apparatus. In the clutch apparatus of the automatic transmission according to any one of claims 1 to 4,
A clutch device for an automatic transmission, characterized in that a locking member for preventing relative movement in the axial direction between an inner peripheral portion and an outer peripheral portion is provided at a central portion in the axial direction of the coupling portion of the clutch drum. A clutch drum having an outer cylindrical portion and a bottom wall portion at one end thereof; a clutch hub disposed in the clutch drum so as to be relatively rotatable; and disposed between the clutch drum and the clutch hub. A plurality of alternately engaged friction plates, a piston for connecting the clutch drum and the clutch hub by pressing and fastening the friction plates, and hydraulic pressure for applying a pressing force to the piston are supplied. With a hydraulic chamber,
The piston includes an inner pressure receiving portion that defines the hydraulic chamber, an outer friction plate pressing portion that is axially offset from the pressure receiving portion toward the clutch drum bottom wall, and the pressure receiving portion and the pressing portion. And a cylindrical connecting part for connecting
A seal member support portion that extends from the clutch drum bottom wall portion to the inside of the cylindrical coupling portion of the piston is extended, and a lip portion that faces the piston pressure receiving portion side of the lip seal supported by the support portion is provided. While sealingly contacting the outer periphery of the pressure receiving chamber in sliding contact with the inner peripheral surface of the cylindrical connecting portion,
The clutch drum is divided into at least two parts, ie, an inner peripheral part where the seal member supporting part is extended and an outer peripheral part thereof, and the coupling part is provided inside the outer peripheral part of the lip seal. In the assembly method of the clutch device of
Before connecting the inner peripheral portion and the outer peripheral portion of the clutch drum, the lip seal is attached to the seal member support portion of the inner peripheral portion so that the lip portion faces the piston pressure receiving portion side,
Next, the lip portion of the lip seal is contracted by inserting the inner peripheral portion of the clutch drum into a jig having an outer peripheral wall having an inner diameter substantially equal to the inner diameter of the cylindrical connecting portion of the piston. Diameter,
In this state, while contacting the end surface of the jig and the end surface of the piston so that the inner peripheral surface of the outer peripheral wall of the jig is continuous with the inner peripheral surface of the cylindrical coupling portion of the piston,
Guide the lip portion of the lip seal along the inner peripheral surface of the outer peripheral wall of the jig into the inner peripheral surface of the cylindrical connecting portion,
The clutch drum inner peripheral portion and the piston are brought close to each other until the lip portion contacts a predetermined position on the inner peripheral surface of the cylindrical connecting portion, and then the outer peripheral portion is coupled to the clutch drum inner peripheral portion. A clutch device assembly method for an automatic transmission.

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