JP2019082196A - Automatic transmission - Google Patents

Abstract

To compactly form a bearing for supporting a rotary member, in an automatic transmission provided with a support part for supporting the rotary member via the bearing on a vertical wall part of a transmission case, and enable closing of an opening of an oil passage which is formed in a cylindrical part provided on the vertical wall part of the transmission case.SOLUTION: An automatic transmission 10 is provided with a support part for supporting a rotary member 31 via a bearing 50 on a vertical wall part 21 of a transmission case 11. In the automatic transmission, in a cylindrical part 22 provided on the inner peripheral side of the vertical wall part 21, an oil passage 22a is formed to extend radially inward from the outer peripheral surface, and the bearing 50 for supporting the rotary member 31 is mounted to the outer peripheral surface to close an opening of the oil passage 22a. A support part provided on the vertical wall part 21 for supporting the rotary member 31 is formed of the cylindrical part 22.SELECTED DRAWING: Figure 4

Description

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

  An automatic transmission mounted on a vehicle generally comprises a plurality of planetary gear sets (planet gear mechanisms) and a plurality of friction coupling elements such as a clutch and a brake, and selectively coupling these friction coupling elements by hydraulic control. Thus, the power transmission path via each planetary gear set can be switched to realize a plurality of forward shift speeds and a reverse shift speed of generally one stage.

  For example, Patent Document 1 includes four planetary gear sets, five friction fastening elements having three clutches and two brakes, and selectively fastening three of these friction fastening elements An automatic transmission is disclosed that is configured to provide eight forward gears and one reverse gear.

International Publication No. 2016/063857

  In the automatic transmission as described in Patent Document 1, a support portion extending in the axial direction is provided on the vertical wall portion of the transmission case, and a hub member which is an inner rotating member of the clutch via a bearing on the support portion In some cases, a rotating member such as a drum member, which is an outer rotating member, is rotatably supported.

  In such a case, a cylindrical portion extending in the axial direction in the vertical wall of the transmission case is provided radially inward of the support provided on the vertical wall of the transmission case, and the hydraulic chamber of the clutch is An oil passage for supplying oil to the oil supply portion may be formed so as to extend radially inward from the outer peripheral surface, and a closing member may be attached to the outer peripheral surface so as to close the opening of the oil passage.

  FIG. 6 is a cross-sectional view showing a vertical wall portion of the conventional automatic transmission and the periphery thereof. As shown in FIG. 6, in the automatic transmission 100, the radially extending vertical wall portion 102 integrally provided in the transmission case 101 is provided with the axially extending support portion 103, and the support portion 103 is provided with a clutch The rotary member 104 may be rotatably supported via a bearing 106 disposed between the rotary member 104 and the extension portion 105 provided on the rotary member 104.

  Further, a cylindrical portion 107 axially extending inward in the radial direction from the support portion 103 is provided in the vertical wall portion 102 of the transmission case 101, and an oil passage supplying oil to the hydraulic chamber 108 of the clutch in the cylindrical portion 107 The oil passage 110 which constitutes 109 may be formed to extend radially inward from the outer peripheral surface, and a closing member 111 may be attached to the outer peripheral surface to close the opening of the oil passage 110.

  In recent years, further weight reduction of a vehicle is required, and further weight reduction of an automatic transmission is also required. As in the automatic transmission shown in FIG. 6, in an automatic transmission provided with a supporting portion for supporting the rotating member via the bearing on the vertical wall portion of the transmission case, the bearing for supporting the rotating member is in the radial direction In addition, it is possible to achieve further weight reduction by making the device compact.

  However, when the bearing for supporting the rotation member is configured to be compact in the radial direction, the longitudinal wall of the transmission case is provided with a cylindrical portion axially extending radially inward from the support portion and the outer periphery of the cylindrical portion If a closing member is attached to the surface to close the opening of the oil passage formed in the cylindrical portion, the closing member may not be attached.

  Therefore, in the automatic transmission according to the present invention, the vertical wall portion of the transmission case is provided with a supporting portion for supporting the rotating member via the bearing, the bearing for supporting the rotating member is configured to be compact in the radial direction. Another object of the present invention is to make it possible to close an opening of an oil passage formed in a cylindrical portion provided in a vertical wall portion of a transmission case.

  In order to solve the above-mentioned subject, the present invention is characterized by having constituted as follows.

  First, the invention according to claim 1 of the present application is an automatic transmission provided with a support portion extending in an axial direction to a vertical wall portion of a transmission case and rotatably supporting a predetermined rotating member via a bearing. A cylindrical portion extending in the axial direction is provided on the inner peripheral side of the vertical wall of the transmission case, and an oil passage for supplying oil to a predetermined oil supply portion is provided on the cylindrical portion. And a bearing for rotatably supporting the rotating member is attached to the outer peripheral surface of the cylindrical portion so as to close the opening of the oil passage, A supporting portion rotatably supporting the rotating member provided on a vertical wall portion of the machine case is characterized by being constituted by the cylindrical portion.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the rotating member is a rotating member of a clutch disposed in the transmission case.

  In the invention according to claim 3, in the invention according to claim 1 or 2, the vertical wall portion and the cylindrical portion are fixed by using a fastening means, and the cylindrical portion is fixed to the vertical wall portion. A first oil passage extending radially inward from an outer peripheral surface of the cylindrical portion and supplying oil to the oil supply portion is formed in the cylindrical portion, and the vertical wall portion is formed with a radial direction And a second oil passage connected to the first oil passage of the cylindrical portion, and a third oil passage connecting the first oil passage and the second oil passage to the cylindrical portion and the vertical wall portion. An oil passage is provided so as to extend in the axial direction in a circular cross-sectional shape.

  In the invention according to claim 4, in the invention according to any one of claims 1 to 3, an oil passage for supplying oil to the oil supply portion is circumferentially directed to the cylindrical portion. A plurality of bearings are provided at different positions, and the bearings are attached to the outer peripheral surface of the cylindrical portion so as to close the openings of the plurality of oil passages provided in the cylindrical portion.

  The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the bearing is a needle bearing.

  According to the invention set forth in claim 1 of the present application, the automatic transmission provided with the support portion for supporting the rotating member via the bearing on the vertical wall portion of the transmission case is provided on the inner peripheral side of the vertical wall portion. An oil passage is formed so as to extend radially inward from the outer peripheral surface and a bearing for supporting the rotating member is attached to the outer peripheral surface so as to close the opening of the oil passage. The support part which supports the rotation member provided in the vertical wall part is comprised by the cylindrical part.

  Thus, a bearing for supporting the rotating member is attached to the outer peripheral surface of the cylindrical portion provided on the vertical wall of the transmission case so as to close the opening of the oil passage, and the rotating member is supported via the bearing. Since the supporting portion is formed by the cylindrical portion, the closing member for closing the opening of the oil passage is attached to the outer peripheral surface of the cylindrical portion and the supporting portion for supporting the rotating member through the bearing on the vertical wall portion is the closing member The bearing for supporting the rotating member can be made compact in the radial direction and can be formed in the cylindrical portion provided on the vertical wall portion of the transmission case as compared with the case where it is provided on the more radially outward side. It is possible to close the opening of the oil passage.

  The bearing for supporting the rotating member can be made compact in the radial direction to reduce weight, and the bearing for supporting the rotating member can function as a closing member for closing the opening of the oil passage. Therefore, it is not necessary to separately provide a closing member, and the number of parts and the assembly process can be reduced.

  Further, according to the invention described in claim 2, the rotating member is a rotating member of the clutch disposed in the transmission case, whereby the rotating member of the clutch disposed in the transmission case is the transmission case. The above effect can be effectively obtained when supporting on the cylindrical portion provided on the vertical wall portion.

  According to the third aspect of the present invention, the first oil passage is fixed using the fastening means and the cylindrical portion is provided on the vertical wall portion, and the cylindrical portion has the first oil passage extending radially inward from the outer peripheral surface. A second oil passage extending in the radial direction is formed in the vertical wall portion, and a third oil passage connecting the first oil passage and the second oil passage is formed in a circular shape in the cylindrical portion and the vertical wall portion. It is provided to extend in the axial direction.

  Thus, when the vertical wall portion and the cylindrical portion are separately formed and the seal member is used for the peripheral surface of the third oil passage on the mating surface of the vertical wall portion and the cylindrical portion, a circular seal member is used. It can be used, and good sealing performance can be secured on the mating surface of the vertical wall portion and the cylindrical portion.

  According to the invention described in claim 4, a plurality of oil passages are provided in the cylindrical portion at different positions in the circumferential direction, and the bearing is provided on the outer peripheral surface of the cylinder so as to close the openings of the plurality of oil passages. By being mounted on one side, the openings of the plurality of oil passages can be closed using one bearing, compared to the case of using a plurality of closing members respectively closing the openings of the plurality of oil passages, The number of parts and the assembly process can be reduced.

  Further, according to the invention as set forth in claim 5, since the bearing is a needle bearing, the dimension in the radial direction of the bearing can be made smaller than in the case of a ball bearing, thereby further reducing the weight. Can be

FIG. 1 is a skeleton view of an automatic transmission according to an embodiment of the present invention. It is a fastening table of the friction fastening element of an automatic transmission. It is sectional drawing which shows the vertical wall part of an automatic transmission, and its periphery. It is sectional drawing which expands and shows the vertical wall part of an automatic transmission, and its periphery. It is another sectional view which expands and shows the vertical wall part of automatic transmission, and its circumference. It is sectional drawing which shows the vertical wall part of the conventional automatic transmission, and its periphery.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

  FIG. 1 is a skeleton view showing the configuration of an automatic transmission 10 according to an embodiment of the present invention. The automatic transmission 10 is disposed in the transmission case 11 on the side opposite to the drive source (right side in the figure) and the input shaft 12 connected to the drive source and disposed on the drive source side (left side in the figure) And the output shaft 13 of FIG. The automatic transmission 10 is a vertically-mounted type for a front engine, a rear drive car, etc. in which the input shaft 12 and the output shaft 13 are arranged on the same axis.

  From the drive source side, the first, second, third and fourth planetary gear sets (hereinafter simply referred to as “first, second, third and fourth gear sets”) are arranged on the axis of the input shaft 12 and the output shaft 13 ) PG1, PG2, PG3 and PG4 are disposed.

  In the transmission case 11, the first clutch CL1 is disposed on the drive source side of the first gear set PG1, the second clutch CL2 is disposed on the drive source side of the first clutch CL1, and the drive source of the second clutch CL2 A third clutch CL3 is disposed on the side. Further, the first brake BR1 is disposed on the drive source side of the third clutch CL3, and the second brake BR2 is disposed on the outer circumferential side of the third gear set PG3.

  Each of the first, second, third, and fourth gear sets PG1, PG2, PG3, and PG4 is a single pinion type in which a pinion supported by a carrier directly meshes with a sun gear and a ring gear. The first, second, third and fourth gear sets PG1, PG2, PG3 and PG4 respectively have, as rotating elements, sun gears S1, S2, S3 and S4, ring gears R1, R2, R3 and R4, and carriers C1 and C2. , C3 and C4.

  The first gear set PG1 is a double sun gear type in which the sun gear S1 is divided into two in the axial direction. The sun gear S1 has a first sun gear S1a disposed on the drive source side and a second sun gear S1b disposed on the opposite side of the drive source. The first and second sun gears S1a and S1b have the same number of teeth and mesh with the same pinion supported by the carrier C1. As a result, the first and second sun gears S1a and S1b always rotate in the same manner.

  In the automatic transmission 10, the sun gear S1 of the first gear set PG1, specifically, the second sun gear S1 b and the sun gear S4 of the fourth gear set PG4 are always connected, and the ring gear R1 of the first gear set PG1 and the sun gear of the second gear set PG2 S2 is always connected, the carrier C2 of the second gear set PG2 and the carrier C4 of the fourth gear set PG4 are always connected, and the carrier C3 of the third gear set PG3 and the ring gear R4 of the fourth gear set PG4 are always connected .

  The input shaft 12 is always connected to the carrier C1 of the first gear set PG1 through the space between the first sun gear S1a and the second sun gear S1b, and the output shaft 13 is always connected to the carrier C4 of the fourth gear set PG4.

  The first clutch CL1 is disposed between the carrier C1 of the input shaft 12 and the first gear set PG1 and the sun gear S3 of the third gear set PG3 to connect and disconnect them, and the second clutch CL2 is The ring gear R1 of the first gear set PG1 and the sun gear S2 of the second gear set PG2 are disposed between the sun gear S3 of the third gear set PG3 to connect and disconnect them, and the third clutch CL3 is a second gear set It is disposed between the ring gear R2 of PG2 and the sun gear S3 of the third gear set PG3 to connect and connect these.

  The first, second and third clutches CL1, CL2 and CL3 respectively have hydraulic chambers P1, P2 and P3 defined by a cylinder and pistons fitted to the cylinders, and the hydraulic chambers P1, P2 When oil is supplied to P3 and hydraulic pressure is supplied, the friction plate is fastened, and the pair of inner and outer rotating members are coupled.

  The first brake BR1 is disposed between the transmission case 11 and the sun gear 1 of the first gear set PG1, specifically, the first sun gear S1a so as to connect and disconnect these, and the second brake BR2 Is disposed between the transmission case 11 and the ring gear R3 of the third gear set PG3 to connect and connect them.

  The first and second brakes BR1 and BR2 respectively have hydraulic chambers P4 and P5 defined by a cylinder and a piston fitted to the cylinder, oil is supplied to the hydraulic chambers P4 and P5, and hydraulic pressure is obtained. When supplied, the friction plates are fastened, and the inner rotating members of the first and second brakes BR1 and BR2 are coupled to the transmission case 11.

  A vertical wall 21 extending radially inward between the first brake BR1 and the third clutch CL3 is integrally provided in the transmission case 11, and a reverse drive source is provided on the inner peripheral side of the vertical wall 21. A cylindrical portion 22 formed in a cylindrical shape extending in the axial direction is provided on the side. A power transmission connecting the outer rotating member of the first clutch CL1, the inner rotating members of the second and third clutches CL2 and CL3, and the sun gear S3 of the third gear set PG3 to the outer peripheral side opposite to the drive source side of the cylindrical portion 22. A member 31 is arranged.

  Then, oil paths leading from the control valve unit (not shown) to the hydraulic chambers P3, P2 and P1 of the third, second and first clutches CL3, CL2 and CL1, respectively, to the vertical wall portion 21 and the cylindrical portion 22 of the transmission case 11 a, b, c are formed. The transmission case 11 is also formed with oil paths d and e respectively communicating with the oil pressure chambers P4 and P5 of the first and second brakes BR1 and BR2.

  With the above configuration, as shown in FIG. 2, the automatic transmission 10 has a combination of the engagement states of the first clutch CL1, the second clutch CL2, the third clutch CL3, the third brake BR1, and the second brake BR2 as shown in FIG. The 1st to 8th speeds in the range and the reverse speed in the R range are formed.

  The vertical wall portion of the automatic transmission according to this embodiment and the structure around it will be further described with reference to FIGS. 3 to 5.

  FIG. 3 is a cross-sectional view showing the vertical wall of the automatic transmission and the periphery thereof. As shown in FIG. 3, the vertical wall 21 integrally provided in the transmission case 11 extends radially inward and extends inward of the vertical wall 21 axially in the opposite direction to the drive source. A cylindrical portion 22 is provided. The cylindrical portion 22 includes a first cylindrical portion 23 disposed on the vertical wall side, and a second cylindrical portion 24 disposed on the opposite vertical wall side and smaller in outer diameter than the first cylindrical portion 23.

  The first wall portion 21 of the transmission case 11 and the inner peripheral side of the cylindrical portion 22 are provided with a substantially cylindrical sleeve portion 25 integrally formed with the vertical wall portion 21 and the cylindrical portion 22. A power transmission member 14 as a rotation member is provided which connects the inner rotation member of the brake BR1 and the sun gear S1 of the first gear set PG1, specifically the first sun gear S1a. An input shaft 12 is disposed on the inner peripheral side of the power transmission member 14.

  The outer rotation member of the first clutch CL1 and the inner rotation member of the second and third clutches CL2 and CL3 and the third gear set are provided on the outer peripheral side of the cylindrical portion 22 of the transmission case 11, specifically the outer peripheral side of the second cylindrical portion 24. A power transmission member 31 is disposed as a rotating member connecting the sun gear S3 of PG3.

  The power transmission member 31 is splined to the power transmission member 32 and the power transmission member 32 coupled to the power transmission member 32 connected to the outer rotation member of the first clutch CL1 and the inner rotation member of the second clutch CL2, and the inner surface of the third clutch CL3. A power transmission member 33 connected to the rotation member, a power transmission member 34 spline-engaged with the power transmission member 33 and extending to the drive source side and extending radially outward from the end on the drive source side; The power transmission member 35 is spline-engaged with the transmission member 34 and extends to the opposite side of the drive source and is connected to the sun gear S3 of the third gear set PG3.

  In the automatic transmission 10, the hydraulic pressure chamber P3 of the third, second, and first clutches CL3, CL2, and CL1 is formed between the vertical wall 21, the cylindrical portion 22, and the sleeve 25 of the transmission case 11 and the power transmission member 31. Oil passages a, b and c respectively communicating with P2 and P1 are formed.

  FIG. 4 is an enlarged cross-sectional view of the vertical wall of the automatic transmission and the periphery thereof, and FIG. 5 is another cross-sectional view of the vertical wall of the automatic transmission and the periphery thereof. As shown in FIG. 3 and FIG. 4, the transmission case 11 is disposed on the drive source side of the first case member 41 formed in a cylindrical shape and the first case member 41 and of the first case member 41. And a second case member 42 extending radially inward. The second case member 42 is fixed to the first case member 41 using a fastening bolt B1. The vertical wall 21 of the transmission case 11 is constituted by a second case member 42.

  A first cylindrical member 43 formed in a substantially cylindrical shape is disposed on the side opposite to the drive source of the second case member 42, and the first cylindrical member 43 is a large diameter portion disposed on the second case member 42 side. 43a and a small diameter portion 43b disposed on the side opposite to the second case member and smaller in outer diameter than the large diameter portion 43a.

  The inner diameter of the first cylindrical member 43 is equal to the inner diameter of the second case member 42. The cylindrical portion 22 of the transmission case 11 is constituted by a first cylindrical member 43, and the first cylindrical portion 23 and the second cylindrical portion 24 are respectively constituted by a large diameter portion 43a and a small diameter portion 43b.

  As shown in FIG. 5, a bolt insertion hole 42 a extending in the axial direction is formed in the second case member 42, and a second case member 42 is formed in the first cylindrical member 43 on the second case member side. An axially extending screw hole 43c is formed corresponding to the bolt insertion hole 42a.

  The vertical wall portion 21 and the cylindrical portion 22 of the transmission case 11 have the first cylindrical member 43 in the second case member 42 by screwing the fastening bolt B2 as fastening means into the screw hole 43c through the bolt insertion hole 42a. It is fixed and the cylindrical part 22 is integrally provided in the vertical wall part 21. As shown in FIG.

  A second cylindrical member 44 formed in a substantially cylindrical shape is disposed on the inner peripheral side of the second case member 42 and the first cylindrical member 43. The second cylindrical member 44 is fitted to the inner peripheral surfaces of the second case member 42 and the first cylindrical member 43 by press fitting, and the second cylindrical member 44 is fixed to the second case member 42 and the first cylindrical member 43. There is. The vertical wall portion 21 of the transmission case 11 and the sleeve portion 25 provided on the inner peripheral side of the cylindrical portion 22 are constituted by a second cylindrical member 44.

  As described above, the outer rotation member of the first clutch CL1 and the second and third clutches CL2 and CL3 are provided on the outer peripheral side of the cylindrical portion 22 provided on the vertical wall portion 21 of the transmission case 11 on the opposite side of the drive source. The power transmission member 31 as a rotation member which connects the inner rotation member of the third gear set PG3 and the sun gear S3 of the third gear set PG3 is disposed. The power transmission member 31 includes a drive source side extending portion 31 a extending in a substantially cylindrical shape on the drive source side, and the drive source side extending portion 31 a is spaced apart on the outer peripheral side of the cylindrical portion 22.

  A bearing 50 for rotatably supporting the power transmission member 31 is disposed between the outer peripheral surface of the cylindrical portion 22 and the inner peripheral surface of the drive source side extending portion 31a of the power transmission member 31, and the power transmission member 31 is rotatably supported by the cylindrical portion 22 via an annularly formed bearing 50. The power transmission member 31 is also rotatably supported by the transmission case 11 via the bearing 50 on the opposite side of the drive source. A needle bearing is used as the bearing 50.

  The power transmission member 31 is provided at a portion of the first, second, and third clutches CL1, CL2, and CL3 in a portion fitted to the opposite drive source side of the cylindrical portion 22 on the opposite drive source side than the drive source side extension 31a. There are formed oil passages c, b, a that respectively communicate with the hydraulic pressure chambers P1, P2, P3.

  In FIG. 4, an oil passage a for supplying oil to supply the oil pressure to the oil pressure chamber P3 of the third clutch CL3 is shown. As shown in FIG. 4, an oil passage a communicating with the hydraulic pressure chamber P3 of the third clutch CL3 is formed in the vertical wall portion 21 and the cylindrical portion 22 of the transmission case 11.

  The oil passage a communicating with the oil pressure chamber P3 of the third clutch CL3 is provided in the cylindrical portion 22 and extends in the radial direction (first oil passage) 22a, and oil provided in the vertical wall portion 21 and extending in the radial direction Oil passages (third oil passages) 22b and 21b provided in the passage (second oil passage) 21a, the cylindrical portion 22 and the vertical wall portion 21 and extending in the axial direction to connect the oil passage 22a and the oil passage 21a An axially extending oil passage 25a provided in the sleeve portion 25, a radially extending communication passage 22c provided in the cylindrical portion 22, and a radially extending third clutch CL3 provided in the power transmission member 31. And an oil passage 31b that opens to the hydraulic pressure chamber P3.

  Further, oil passages b and c communicating with the hydraulic chambers P2 and P1 of the second and first clutches CL2 and CL1 are formed in the vertical wall portion 21 and the cylindrical portion 22 of the transmission case 11, respectively. In the vertical wall portion 21 and the cylindrical portion 22 of the transmission case 11, oil passages c, b, a leading to the hydraulic chambers P1, P2, P3 of the first, second and third clutches CL1, CL2, CL3 are circumferential direction Are arranged at different positions, for example, at different positions at equal intervals in the circumferential direction.

  The automatic transmission 10 is provided with a control valve unit (not shown), and from the control valve unit, oil pressure chambers P1 of the first, second and third clutches CL1, CL2 and CL3 via oil passages c, b and a. , P2 and P3 are supplied with oil and oil pressure is supplied.

  In the present embodiment, the oil passage a communicating with the hydraulic pressure chamber P3 of the third clutch CL3 formed in the vertical wall 21 and the cylindrical portion 22 of the transmission case 11 is provided in the vertical wall 21 of the transmission case 11. The oil passage 22 a formed in the cylindrical portion 22 is formed by processing a hole radially inward from the outer peripheral surface of the cylindrical portion 22.

  The bearing 50 disposed between the outer peripheral surface of the cylindrical portion 22 and the inner peripheral surface of the drive source side extending portion 31 a of the power transmission member 31 is an oil passage 22 a formed on the outer peripheral surface of the cylindrical portion 22. It is press-fit and attached to the outer peripheral surface of the cylindrical part 22 so that the opening part of may be closed. The power transmission member 31 is supported by the cylindrical portion 22 via the bearing 50 with the inner peripheral surface of the drive source side extending portion 31 a pressed into the bearing 50.

  Further, in the cylindrical portion 22 provided in the vertical wall portion 21 of the transmission case 11, oil passages 21b and 22b provided in the vertical wall portion 21 and the cylindrical portion 22 and connecting the oil passage 21a and the oil passage 22a are used. In order to prevent an oil leak, a seal member 51 is attached to the peripheral edge of the oil passages 21b and 22b. The oil passages 21b and 22b provided respectively in the vertical wall portion 21 and the cylindrical portion 22 are provided so as to extend in the axial direction in a circular cross-sectional shape, and are formed in a circular shape at the peripheral wall side of the oil passage 22b. The seal member 51 thus mounted is mounted in the circumferential groove for the seal member.

  The vertical wall portions of the transmission case 11 are also connected to the oil passages b and c communicating with the hydraulic chambers P2 and P1 of the second and first clutches CL2 and CL1 formed in the vertical wall portion 21 and the cylindrical portion 22 of the transmission case 11 The oil passage 21 is formed in the same manner as the oil passage a communicating with the oil pressure chamber P3 of the third clutch CL3 formed in the cylinder portion 22 and the cylinder portion 22. The oil passages constituting the oil passages a, b, c formed in the cylindrical portion 22 are arranged at substantially the same axial positions and at different positions in the circumferential direction.

  In the automatic transmission 10, the oil passage 22a is formed on the cylindrical portion 22 provided on the inner peripheral side of the vertical wall 21 of the transmission case 11 so as to extend radially inward from the outer peripheral surface, and the outer peripheral surface A bearing 50 for supporting the power transmission member 31 is mounted to close the opening of the oil passage 22a, and supports the power transmission member 31 via the bearing 50 on the vertical wall 21 of the transmission case 11. The portion is constituted by a cylindrical portion 22.

  In the present embodiment, the oil passage formed in the cylindrical portion 22 so as to extend radially inward from the outer peripheral surface and the opening is closed by the bearing 50 is a first, second and third clutch CL1, CL2, The oil passages c, b and a that supply oil to the oil pressure chambers P1, P2 and P3 of CL3 are oil passages, but other oil passages such as oil passages that supply lubricating oil to the cylindrical portion are formed The same applies to the case. In the present embodiment, a needle bearing is also used as the bearing 50, but it is also possible to use a ball bearing.

  As described above, according to the automatic transmission 10 according to the present embodiment, the vertical wall 21 of the transmission case 11 is provided with the support for supporting the rotating member 31 via the bearing 50, and the inside of the vertical wall 21 is In the cylindrical portion 22 provided on the circumferential side, the oil passage 22a is formed to extend radially inward from the outer peripheral surface, and a bearing 50 for supporting the rotating member 31 on the outer peripheral surface is an opening of the oil passage 22a. A support portion attached so as to close the portion and supporting the rotating member 31 provided on the vertical wall portion 21 is constituted by the cylindrical portion 22.

  Thus, the bearing 50 for supporting the rotating member 31 is attached to the outer peripheral surface of the cylindrical portion 22 provided on the vertical wall portion 21 of the transmission case 11 so as to close the opening of the oil passage 22a. Since the support portion for supporting the rotary member 31 via the cylinder portion 22 is formed by the cylindrical portion 22, a closing member for closing the opening of the oil passage is attached to the outer peripheral surface of the cylindrical portion and the vertical wall rotates via the bearing. The bearing 50 for supporting the rotating member 31 can be made compact in the radial direction as compared with the case where the supporting portion for supporting the member is provided radially outward of the closing member, and the transmission case 11 The opening of the oil passage 22a formed in the cylindrical portion 22 provided in the vertical wall portion 21 can be closed.

  The bearing 50 for supporting the rotating member 31 can be made compact in the radial direction to reduce the weight, and at the same time, the bearing 50 for supporting the rotating member 31 closes the opening of the oil passage 22a. By functioning as a member, it is not necessary to separately provide a closing member, and the number of parts and the assembly process can be reduced.

  The rotating member 31 is a rotating member 31 of a clutch disposed in the transmission case 11. Thus, when the rotating member 31 of the clutch disposed in the transmission case 11 is supported by the cylindrical portion 22 provided on the vertical wall portion 21 of the transmission case 11, the bearing 50 for supporting the rotating member 31. Can be made compact in the radial direction, and the opening of the oil passage 22a formed in the cylindrical portion 22 provided on the vertical wall 21 of the transmission case 11 can be closed.

  Further, a cylindrical portion 22 is provided on the vertical wall portion 21 by being fixed using the fastening means B2, and a first oil passage 22a extending inward in the radial direction from the outer peripheral surface is formed in the cylindrical portion 22. A second oil passage 21a extending in the radial direction is formed at 21. The third oil passages 21b and 22b connecting the first oil passage 22a and the second oil passage 21a to the cylindrical portion 22 and the vertical wall portion 21 are cross sections. It is provided to extend axially in a circular shape.

  Thus, in the case where the vertical wall 21 and the cylindrical portion 22 are separately formed and the seal member 51 is used for the peripheral portion of the third oil passages 21 b and 22 b on the mating surface of the vertical wall 21 and the cylindrical portion 22 In addition, a circular seal member 51 can be used, and good sealing performance can be ensured on the mating surface of the vertical wall portion 21 and the cylindrical portion 22.

  A plurality of oil passages 22a are provided in the cylindrical portion 22 at different positions in the circumferential direction, and the bearings 50 are attached to the outer peripheral surface of the cylindrical portion 22 so as to close the openings of the plurality of oil passages 22a. As a result, since the openings of the plurality of oil passages 22a can be closed using one bearing 50, compared with the case of using a plurality of closing members respectively closing the openings of the plurality of oil passages, The number of points and the assembly process can be reduced.

  Further, the bearing 50 is a needle bearing, whereby the radial dimension of the bearing can be reduced as compared with the case of a ball bearing, and weight can be further reduced.

  The present invention is not limited to the illustrated embodiment, and various improvements and design changes are possible without departing from the scope of the present invention.

  As described above, according to the present invention, in the automatic transmission provided with the support portion for supporting the rotating member via the bearing on the vertical wall portion of the transmission case, the bearing for supporting the rotating member in the radial direction And the opening of the oil passage formed in the cylindrical portion provided in the vertical wall of the transmission case can be closed. It may be suitably used in the field of manufacturing technology of

DESCRIPTION OF SYMBOLS 10 Automatic transmission 11 Transmission case 21 Vertical wall part 22 Cylindrical part 14, 31, 32, 33, 34, 35 Power transmission member 50 Bearing a, b, c, 21a, 21b, 22a, 22b, 22b, 22c, 25a, 31b Oil path B1, B2 Fastening bolt CL1, CL2, CL3 Clutch P1, P2, P3, P4, P5 Oil pressure chamber

Claims (5)

An automatic transmission is provided with a support portion axially extending in a longitudinal wall portion of a transmission case and rotatably supporting a predetermined rotating member via a bearing.
An axially extending cylindrical portion is provided on the inner peripheral side of the vertical wall portion of the transmission case.
An oil passage for supplying oil to a predetermined oil supply portion is formed in the cylindrical portion so as to extend radially inward from an outer peripheral surface of the cylindrical portion, and the rotating member is rotated on the outer peripheral surface of the cylindrical portion A bearing for freely supporting is attached to close the opening of the oil passage,
A supporting portion rotatably supporting the rotating member provided on a vertical wall portion of the transmission case is configured by the cylindrical portion.
Automatic transmission characterized by. The rotating member is a rotating member of a clutch disposed in the transmission case.
The automatic transmission according to claim 1, characterized in that: The vertical wall portion and the cylindrical portion are fixed using fastening means, and the cylindrical portion is provided on the vertical wall portion,
A first oil passage extending radially inward from an outer peripheral surface of the cylindrical portion and supplying oil to the oil supply portion is formed in the cylindrical portion,
A second oil passage extending radially and connected to the first oil passage of the cylindrical portion is formed in the vertical wall portion,
A third oil passage connecting the first oil passage and the second oil passage is provided in the cylindrical portion and the vertical wall portion so as to axially extend in a circular shape in cross section.
The automatic transmission according to claim 1 or 2, characterized in that: In the cylindrical portion, a plurality of oil passages for supplying oil to the oil supply portion are provided at different positions in the circumferential direction,
The bearing is attached to an outer peripheral surface of the cylindrical portion so as to close openings of the plurality of oil passages provided in the cylindrical portion.
The automatic transmission according to any one of claims 1 to 3, characterized in that. The bearing is a needle bearing,
The automatic transmission according to any one of claims 1 to 4, characterized in that.

Images