JP2740942B2 - Automatic transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission having a support for rotatably supporting an annular hydraulic servo drum in the automatic transmission. 2. Description of the Related Art Japanese Unexamined Patent Publication No. 57-22455 and Japanese Utility Model Publication No. 57-39652 disclose a support having a cylindrical support portion which is fitted into a hydraulic servo drum of a friction engagement device (Japanese Patent Application Laid-Open No. 57-1995). An automatic transmission equipped with a hollow fixed shaft 55 described in Japanese Patent No. 22455 and a case 49 (cylinder 58) described in Japanese Utility Model Publication No. 57-39652) is shown. In these prior arts, a hydraulic oil supply hole formed in an inner peripheral cylindrical portion of a hydraulic servo drum is provided on an outer periphery of a cylindrical support portion of a support. The ports 63 and 65 described in Japanese Patent Application Laid-Open No. 22455, and the oil passages provided in the radial cylinder 58 connecting the oil path 76 and the cylinder chamber 78 described in Japanese Utility Model Publication No. 57-39652) are actuated from radially outer openings. In order to guide the oil, seal ring grooves for mounting a seal ring are formed on both sides in the axial direction of the opening of the oil passage in the cylindrical support portion. In general, the support is a large part, and a light alloy such as aluminum is used to reduce the weight of the automatic transmission. The seal ring is made of cast iron and has excellent compatibility with aluminum and the like. A ring is used. [0005] As described above, the seal ring groove formed on the outer periphery of the cylindrical support portion of the support requires high-precision machining in order to prevent uneven wear. The oil passage in the support portion must be formed with a small diameter and high precision so as not to be displaced in order to open between the two seal ring grooves. However, since the conventional support is formed as one part, the seal ring groove for mounting the seal ring is formed directly on the cylindrical support portion of the support.
Therefore, high-precision processing of the seal ring groove must be performed directly on the support, which is a large part, and the productivity is extremely poor. As a seal ring, a resin seal ring made of fluororesin and the like, which has excellent sealing properties, is attracting attention, but the material of the support, which is a large part, is made of a light alloy such as aluminum to reduce the weight of the automatic transmission. Is used, it is difficult to reduce the amount of oil leaking from the seal ring because it is not possible to use a seal ring made of fluororesin, which has poor compatibility with light alloys, because of its reduced durability. was. An object of the present invention is to solve the above problems and improve the productivity of a support, that is, the productivity of an automatic transmission, and reduce the amount of oil leaking from a seal ring mounted on the support. . The present invention adopts the following constitution in order to solve the above-mentioned problems. That is, in an automatic transmission including a support formed with a hydraulic oil supply oil passage for supplying and discharging hydraulic oil to a hydraulic servo of a friction engagement device constituted by a hydraulic servo drum rotatably fitted to the outside, A support main body having a cylindrical support portion formed on an inner peripheral side and an outer peripheral side fitted to a transmission case; and an outer peripheral sleeve formed separately from the support main body and fixed to an outer periphery of the cylindrical support portion. The outer peripheral sleeve includes an outer peripheral oil groove provided at a position corresponding to a hydraulic oil supply / discharge hole of an inner peripheral cylindrical portion of the hydraulic servo drum forming the hydraulic servo; An automatic transmission having a sleeve hole communicating with the inner peripheral surface of the sleeve, and outer ring grooves provided on both sides of the outer oil groove, wherein a seal ring is attached to the outer ring groove of the outer sleeve; It is. The present invention has the following effects by having the above configuration. In other words, by forming the support body and the outer peripheral sleeve separately, the material of the support body and the outer peripheral sleeve can be adopted according to the respective requirements. In addition to contributing to the weight reduction of the machine, a resin seal ring with excellent sealing properties is adopted as the seal ring attached to the outer sleeve, and the outer sleeve material is made of iron, which is familiar with the resin seal ring. Since the material of the outer peripheral sleeve can be selected according to the material of the seal ring, the amount of oil leakage from the seal ring can be reduced, and the durability of the seal ring can be improved. Further, since the oil groove, the outer ring groove and the sleeve hole, which require high-precision machining, are formed in the outer sleeve which is a small part, compared with the case where these are directly machined to the support which is a large part. This facilitates groove processing. Then, the support can be easily formed only by fixing the outer peripheral sleeve having the grooves formed to the support body, and as a result, the productivity of the automatic transmission is improved. Next, a power transmission shaft and a support for supporting a hydraulic servo drum according to the present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing a power transmission shaft and a support for supporting a hydraulic servo drum according to the present invention, and FIG. 2 is an automatic transmission for a vehicle to which the power transmission shaft and a support for supporting a hydraulic servo drum according to the present invention are applied. FIG. The automatic transmission 100 includes a hydraulic torque converter 200, a transmission 300, and a hydraulic control device 400. The transmission 300 includes an overdrive transmission 3 including a first planetary gear unit U0, one multi-plate clutch C0, one multi-plate brake B0, and one one-way clutch F0 operated by a hydraulic servo.
00A, the second planetary gear set U1, the third planetary gear set U
2. Two multi-plate clutches C operated by hydraulic servo
1, C2, one belt brake B1, two multi-plate brakes B2, B3 and two one-way clutches F1, F2
And an underdrive transmission 300B of three forward speeds and one reverse speed provided with Transmission case 110 of automatic transmission 100
Is a torque converter housing 120 that houses the torque converter 200, an overdrive transmission 300
Transmission case 1 in which A and each of the chambers accommodating underdrive transmission 300B are integrally formed.
30 and an extension housing 140 for covering the rear side of the automatic transmission 100. The torque converter housing 120 and the transmission case 1
30 and the extension housing 140 are fastened with a large number of bolts, respectively, and inside the transmission case 110, the input shaft 1A that transmits power from the torque converter 200 to the overdrive transmission 300A, and the output of the overdrive transmission 300A. A power transmission shaft 1 including an intermediate power transmission shaft 1B that transmits to the underdrive transmission 300B and an output shaft 1C that extracts the output of the underdrive transmission 300B is provided. The torque converter 200 is housed in a torque converter housing 120 whose front side (engine side) is open, and rotates a front cover 201 driven by an engine (not shown), and a circle welded to the inner periphery of the front cover 201. An annular plate-shaped rear cover 202, and a pump impeller 2 provided around the inner wall of the inner peripheral wall surface of the rear cover 202.
03, supported by a fixed shaft 207 connected to the transmission case 110 via a turbine runner 204 disposed opposite the pump impeller 203, a turbine shell 205 holding the turbine runner 204, and a one-way clutch 206. And a diameter clutch (lock-up clutch) 209 for increasing the torque capacity when the input rotation speed is low, and the front cover 201 and the turbine shell 205 having the same rotation between the front cover 201 and the turbine shell 205. It has. An internal gear oil pump 150 having an external gear 150a and an internal gear 150b therein is housed between the cylindrical transmission case 130 and the torque converter housing 120 that are continuous behind the torque converter housing 120, An oil pump body 152 having a tubular portion 151 at the front on the inner periphery is fastened to the front portion of the transmission case 130, and an extension member 210 connected to the inner peripheral end of the rear cover 202 passes through the inner periphery of the tubular portion 151. External gear 1
It is spline-fitted to the inner periphery of 50a. The tubular portion 151 is provided on the rear side of the oil pump body 152.
Cylindrical front support 153 projecting coaxially to the rear and supporting the input shaft 1A around the fixed shaft 201 via the fixed shaft 201.
The oil pump cover 154 is fastened to the oil pump housing 152 and the oil pump cover 15.
4 forms a partition between the torque converter housing 120 and the transmission case 130. In the middle of the transmission case 130, an overdrive mechanism chamber 130A in which the overdrive transmission 300A is formed and an underdrive mechanism chamber 130B in which the underdrive transmission 300B is formed are partitioned.
A center support 5 having a rearwardly projecting cylindrical support portion 3 that supports the intermediate transmission shaft 1B of the power transmission shaft 1 on the inner periphery is provided on the inner periphery. Transmission case 130
A rear support wall 134 that projects forward and has a cylindrical rear support 133 that supports the output shaft 1C on the inner periphery is provided at the rear portion (right side in the figure). The front support 1
Inside the stator 53 of the torque converter 200,
The fixed shaft 207 of the one-way clutch 206 that supports the torque converter 20 is fitted inside the fixed shaft 207.
The input shaft 1 of the transmission 300 which is the output shaft of 0
A is rotatably supported. The input shaft 1A has a flange portion 101 at a rear end, and a rearwardly facing hole 102 is formed at the center of the rear end. Behind the input shaft 1A, an intermediate transmission shaft 1B arranged in series with the input shaft 1A is rotatably mounted, and the intermediate transmission shaft 1B has its tip slidingly contacting a hole 102 of the input shaft 1A. , An oil supply passage 1 for supplying lubricating oil from the outer circumference to the inside of the input shaft 1A and the inside of the output shaft 1C
1. In-shaft supply oil passage 11Ba, in-shaft flow oil passage 11Bb, and inclined oil passage 1 that communicate the outer periphery with a hydraulic servo C-1 described below.
1Bc, a servo oil passage 11B, and a rearward hole 1 having a flange portion 111 at a rear end of the intermediate transmission shaft 1B, at which a front end of an output shaft 1C for transmitting power to a driving wheel side slides.
12 are formed. Oil grooves 11C and 11D are provided on the outer periphery of the lubricating oil supply opening on the outer periphery of the in-shaft supply oil passage 11A and the lubricating oil supply opening on the outer periphery of the servo oil passage 11B, respectively. The oil grooves 11C, 1D are located adjacent to the grooves 11C, 11D.
Seals 11E, 11F, 11G made of resin are provided so as not to leak the working oil and lubricating oil in 1D to the outside. The output shaft 1C has a sensor rotor 121 for detecting the number of revolutions and a speedometer drive gear 122 fixed inside the extension housing 140, and a rear end is splined so that a sleeve yoke for transmitting power to the drive wheel side is fitted to the outer periphery. A groove 123 is formed, is rotatably supported by the extension housing 140 via a sleeve yoke, and has a front end formed with a hole 1 of the intermediate transmission shaft 1B.
12 so as to be rotatable. The overdrive transmission 300A has a first planetary gear set U0 provided behind the input shaft 1A, the ring gear R0 of which is coupled to the intermediate transmission shaft 1B via a flange plate 113, and a planetary carrier P0. The sun gear S0 is connected to the flange 101 of the input shaft 1A.
Is formed by the inner race shaft 13 of the one-way clutch F0. On the front side of the first planetary gear unit U0, a first hydraulic servo drum 14 that opens rearward is fixed to the inner race shaft 13, and an annular piston 15 is provided between an outer peripheral wall 14A and an inner peripheral wall 14B of the first hydraulic servo drum 14. Is fitted to form a hydraulic servo C-0 of a clutch C0 for engaging and disengaging the carrier P0 and the first hydraulic servo drum 14, and the annular piston 1 is provided on the inner race shaft 13 side.
5 is pressed toward the hydraulic servo C-0 side, a clutch C0 is mounted inside the outer peripheral wall 14A,
The first hydraulic servo drum 14, the inner race shaft 13, and the carrier P0 are connected via the clutch C0. A one-way clutch F0 having the inner race shaft 13 as the inner race is provided on the inner periphery of the first hydraulic servo drum 14, and a clutch C0 and a brake B0 are provided between the outer race 17 and the transmission case 130 on the outer periphery thereof. A piston 18 for pressing the brake B0 is fitted in front of the center support 5 behind the center support 5, and a hydraulic servo B-0 for the brake B0 is formed between the piston 18 and the center support 5, and an inner peripheral portion of the front end of the center support 5 is provided. A return spring 19 that presses the piston 18 toward the hydraulic servo B-0 is fitted into 135. In the underdrive device 300B, first, a second hydraulic servo drum 2 to which the present invention is applied is formed on the outer periphery of the cylindrical support portion 3 of the center support 5 with seal rings 7D and 7E and a cylindrical shape. It is rotatably supported via a bush 8, and its outer cylindrical portion 2C and inner cylindrical portion 2 are supported.
A, the annular piston 21 that presses the clutch C2 is fitted between the annular piston 21 and the second hydraulic servo drum 2.
During this time, the hydraulic servo C-2 of the clutch C2 is formed, and the annular piston 21 is mounted on the inner peripheral cylindrical portion 2A side.
A return spring 22 for pressing to the -2 side, a clutch C2 of the outer cylindrical portion 2C are mounted, and a hydraulic oil supply / discharge hole 2B communicating with the inside of the hydraulic servo C-2 is provided in the inner cylindrical portion 2A. I have. Behind the second hydraulic servo drum 2,
A third opening which is open rearward and has an annular projection 23 in front;
The hydraulic servo drum 24 is fixed to the outer periphery of the flange 111 at the rear of the intermediate transmission shaft 1B, and between the rear end of the intermediate transmission shaft 1B, the outer peripheral wall 24A of the third servo drum 24 and the outer periphery of the flange 111. An annular piston 25 for pressing the clutch C1 is fitted and the annular piston 25 is moved between the third hydraulic servo drum 24 and the hydraulic servo C- of the clutch C1.
1 and a return spring 26 for pressing the annular piston 25 toward the hydraulic servo C-1 on the inner peripheral side of the clutch C1, and a clutch C2 mounted on the outer periphery of the annular projection 23. The three hydraulic servo drums 2 and 24 are connected. Behind the third hydraulic servo drum 24, a second planetary gear unit U1 is provided,
The ring gear R1 is connected to the output shaft 1C.
Is connected to a third hydraulic servo drum 24 via an annular projection 28 and a clutch C1 provided on a rotation supporting member 27 rotatably supported on the outer periphery of the output shaft 1C. Spline fitting on the outer circumference,
The sun gear S1 is integrally formed at the tip of a sun gear shaft 29 rotatably provided on the outer periphery of the output shaft 1C. A connecting drum 30 molded so as to cover the second and third hydraulic servo drums 2 and 24 and the second planetary gear unit U1 in the minimum space is fixed to the outer periphery of the second hydraulic servo drum 2 at the front end thereof, The rear end is connected to the sun gear shaft 29 behind the second planetary gear unit U1, and a belt brake B1 for fixing and releasing the connection drum 30 is provided on the outer peripheral side. As shown in FIGS. 3 to 7, the center support 5 has an outer periphery supported by the transmission case 130 and a C2 support internal oil for supplying and discharging hydraulic oil of the hydraulic servo C-2 from the outer periphery to the inner periphery. Path 4A, hydraulic oil supply / discharge hole 2 formed in inner cylindrical portion 2A of second hydraulic servo drum 2
B, an opening on the inner peripheral side of the support inner oil passage 4B that connects the outer periphery and the inner periphery of the cylindrical support portion 3 corresponding to B, and an inner peripheral opening of the support inner oil passage 4B for the C2. C that communicates
2 support portion inner peripheral groove 4C, hydraulic servo C-
C1 support internal oil passage 4E for supplying and discharging the hydraulic oil, a servo communicating with a hydraulic servo C-1 formed in the inner peripheral opening of the C1 support internal oil passage 4E and the intermediate transmission shaft 1B. Servo support inner circumferential groove 4F axially communicating with the outer periphery of the outer peripheral opening position of oil passage 11B, lubricating oil support oil passage 4G for supplying lubricating oil from the outer periphery to the inner periphery, and the lubricating oil support oil passage A lightweight member made of aluminum or the like having a lubrication support portion inner peripheral groove 4H that axially communicates the inner peripheral side opening of the 4G and the outer periphery at the outer peripheral opening position of the intra-axial supply oil passage 11A formed in the intermediate transmission shaft 1B. The support body 5A is fixed from the inner periphery of the cylindrical support portion 3 of the support body 5A, and covers the C2 support portion inner circumferential groove 4C, the servo support portion inner circumferential groove 4F, and the lubricating oil support portion inner circumferential groove 4H. , C2 support part inner circumferential groove 4C for C2 The holding portion inner peripheral oil passage 4D, the servo supporting portion inner peripheral groove 4F are used as the servo supporting portion inner peripheral oil passage 4J, the lubricating oil supporting portion inner peripheral groove 4H is used as the lubricating oil supporting portion inner peripheral oil passage 4K, and the outer periphery of the intermediate transmission shaft 1B. The inner peripheral sleeve 6 made of iron for improving the compatibility with the seal rings 11C and 11E made of fluororesin and the cylindrical support portion 3 of the support body 5A
And a sleeve hole 7A provided at a position corresponding to the hydraulic oil supply / discharge hole 2B of the inner cylindrical portion 2A of the second servo drum 2 from the outer peripheral opening of the support portion inner oil passage 4B. Oil grooves 7F provided at the outer peripheral position corresponding to 7A, and ring grooves 7B and 7 in which resin seal rings 7D and 7E made of a resin such as fluororesin are arranged on the outer periphery of both sides of the oil groove 7F.
C is formed on the outer periphery, and the rear side is a thin cylindrical portion via a step 7G. The outer peripheral sleeve 7 is made of iron and has a journal portion 7H which is an extended portion on which a bush 8 as a support member is disposed on the outer periphery. Behind the step 7G, a gap A is provided in the outer periphery of the outer peripheral sleeve 7, the inner periphery of the inner cylindrical portion 2A, and in front of the bush 8, and the lubricating oil support portion inner peripheral groove 4H and the gap A are lubricated. It is connected by an oil supply path 4L and is provided to receive supply of lubricating oil. Further, the inner peripheral sleeve 6 is not disposed between the intermediate transmission shaft 1B and the cylindrical support portion 3. A roller bearing 6A is disposed at a rear position of the inner peripheral sleeve 6 so that the intermediate transmission shaft 1B can be smoothly rotated. ing. In the above operation, when the clutch C2 is engaged, the hydraulic oil is supplied to the C2 support internal oil passage by the operation of the hydraulic control device 400,
The oil is supplied into the hydraulic servo C-2 via the C2 support portion inner peripheral oil passage 4D, the support portion inner oil passage 4B, the sleeve hole 7A, the oil groove 7F, and the hydraulic oil supply / discharge hole 2A of the inner peripheral cylindrical portion 2A. , C
Hydraulic oil supplied to the first support internal oil passage 4E passes through an oil hole, oil groove 11D, and a servo oil passage 11B of the inner peripheral sleeve 6 through an oil hole, an oil groove 11D, and a servo oil passage 11B. To supply and discharge the hydraulic oil in the hydraulic servo C-1. The lubricating oil supplied to the lubricating oil support internal oil passage 4G is supplied into the in-shaft supply oil passage 11A through an oil hole (not shown) provided in the inner peripheral sleeve 6 and an oil groove 11C. The lubricating oil supplied into the path 11A is supplied to the input shaft 1A and the output shaft 1B. The brake plate b2 of the brake B2 is splined forward and the brake plate b3 of the brake B3 is spline-fitted to the spline 136 formed on the inner periphery of the rear part of the transmission case 130. Is spline-fitted with a fourth hydraulic servo drum 32 having a front opening and an annular projection 31 on the front side. An annular piston 33 for pressing the brake B2 is fitted between the outer peripheral wall 32A of the fourth hydraulic servo drum 32 and the annular projection 31, and the annular piston 33
A hydraulic servo B-2 for the brake B2 is formed between the hydraulic servo drum 32 and the fourth hydraulic servo drum 32, and a return spring 34 for pressing the annular piston 33 toward the hydraulic servo B-2 is provided on the inner peripheral wall 32B side. A one-way clutch F1 having the sun gear shaft 29 as an inner race is provided on the inner peripheral side of the brake B2, and the brake B2 is mounted on the outer peripheral of the outer race 35. An annular hole 36 formed between the outer periphery of the rear support 133 of the rear support wall 134 on the rear side of the brake B2 and the transmission case 130
Pistons 371, 37 pressing the brake B3
3 and the reaction sleeve 372 are fitted to form a hydraulic servo B-3 for the brake B3.
A return spring 38 for pressing the first and third members 373 toward the hydraulic servo B-3 is supported by a return spring attachment 38A mounted on the tip of the rear support 133.
The inner race 39 of the one-way clutch F2 disposed on the inner periphery of the brake B3 is connected to the fourth hydraulic servo drum 32 on the outer periphery of the sun gear shaft 29, and the brake B3 is mounted on the outer periphery of the outer race 40 of the one-way clutch F2. ing. In the third planetary gear set U2, the sun gear S2 is formed integrally with the sun gear shaft 29, the carrier P2 is connected to the outer race 40 of the front one-way clutch F2 and the brake B3, and the parking gear 41 is provided on the outer periphery. The peripheral ring gear R2 is connected to the output shaft 1C via a connecting member 42 whose inner periphery is spline-fitted. The parking gear 41 is provided such that when the shift lever of the automatic transmission is selected to the parking (P) position, the parking claw 43 meshes with the parking gear 41 to fix the output shaft 1C. The transmission 300 receives various frictional engagements from a hydraulic control device 400 in a valve body 403 built in an oil pan 402 fastened by bolts 401 to a lower portion of the transmission case 130 in accordance with running conditions of the vehicle such as a vehicle speed and a throttle opening. The clutches and brakes are engaged or released by the hydraulic pressure selectively output to the hydraulic servo of the device, so that four forward speed shifts or one reverse speed shift are performed. Table 1 shows an example of the operation of each clutch, brake, and one-way clutch and the achieved shift speed (RANGE). [Table 1] In Table 1, E indicates that the corresponding clutch and brake are engaged. X indicates that the corresponding clutch and brake are released. L indicates that the corresponding one-way clutch is engaged in the engine drive state, but the engagement is not necessarily required because the transmission of power is guaranteed by a clutch or a brake incorporated in parallel with this one-way clutch ( Lock)
Is shown. (L) indicates that the corresponding one-way clutch is engaged only in the engine drive state and not engaged in the engine brake state. Further, f indicates that the corresponding one-way clutch is free.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a power transmission shaft and a support for supporting a hydraulic servo drum according to the present invention. FIG. 2 is a side sectional view of an automatic transmission for a vehicle to which a support for supporting a power transmission shaft and a hydraulic servo drum according to the present invention is applied. FIG. 3 is a front view of a support. FIG. 4 is a side sectional view of a support. FIG. 5 is a rear view of the support. FIG. 6 is a sectional view taken along line AA of FIG. FIG. 7 is a sectional view taken along the line BB of FIG. 4; [Description of Signs] 1 Power transmission shaft 1A Input shaft 1B Intermediate transmission shaft 1C Output shaft 2 Second hydraulic servo drum (hydraulic servo drum) 2A Inner peripheral cylindrical part 2B Hydraulic oil supply / discharge hole 3 Cylindrical support part 4 Hydraulic oil Road 4A Support internal oil passage for C2 (support internal oil passage) 4B Support portion internal oil passage (cylindrical support internal oil passage) 4C C2 support internal peripheral groove (cylindrical support internal groove) 4D C2 support internal peripheral oil passage (Inner oil passage in cylindrical support portion) 4E Support inner oil passage for C1 5 Support 5A Support body 6 Inner sleeve 7 Outer sleeve 7A Sleeve hole 7B Ring groove (outer ring groove) 7C Ring groove (outer ring groove) 7D Seal ring 7E Seal ring 7F Oil groove (outer peripheral oil groove) 7H Journal part (extended part) 8 Bush (support member)

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kazuaki Watanabe               1 Toyota Town, Toyota City, Aichi Prefecture               Dosha Co., Ltd.                    Examiner Shogo Tanai                (56) References JP-A-61-41052 (JP, A)                 JP-A-61-45137 (JP, A)                 JP-A-61-38264 (JP, A)                 Showa 55-152857 (JP, U)                 Jiko 62-8434 (JP, Y2)                 Jiko 46-17854 (JP, Y1)                 JP-B-46-24081 (JP, B1)                 US Patent 2,583,556 (US, A)                 Published German Patent Application 2716493 (DE,               A)

Claims (1)

(57) [Claims] An automatic transmission including a support forming a hydraulic oil supply oil passage for supplying and discharging hydraulic oil to a hydraulic servo of a friction engagement device configured by a hydraulic servo drum rotatably fitted to the outside, wherein the support includes: A support main body having a cylindrical support portion formed on the inner peripheral side and an outer peripheral side fitted to the transmission case, and an outer peripheral sleeve formed separately from the support main body and fixed to the outer periphery of the cylindrical support portion. The outer peripheral sleeve includes: an outer peripheral oil groove provided at a position corresponding to a hydraulic oil supply / discharge hole of an inner peripheral cylindrical portion of the hydraulic servo drum; and the outer peripheral oil groove and an inner peripheral surface of the outer peripheral sleeve. An automatic transmission, comprising: a sleeve hole communicating therewith; and an outer peripheral ring groove provided on both sides of the outer peripheral oil groove, wherein a seal ring is mounted in the outer peripheral ring groove of the outer peripheral sleeve. 2. The automatic transmission according to claim 1, wherein the support body is made of a light alloy, the outer peripheral sleeve is made of iron, and the seal ring is made of resin. 3. The outer peripheral sleeve has the outer peripheral oil groove, the sleeve hole, and the seal ring groove formed on one side, and the other has an extending portion extending in the axial direction. 2. The automatic transmission according to claim 1, wherein a support member rotatably supporting the hydraulic servo drum is disposed between the peripheral cylindrical portions.