JP2009127679A - Automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic transmission in which an intermediate wall supporting a counter drive gear is formed separately from a transmission case and gear noise is reduced by accurately maintaining the positional relation between the counter drive gear and the other shaft members. <P>SOLUTION: The counter drive gear 5 is supported on the inner peripheral surface 61a of a supporting cylindrical hole part 61 in the intermediate wall 6. The inner peripheral surface 61a is cut in the state of being temporarily assembled and secured to a gear case part 13. Therefore, the support cylindrical hole part can be machined together with the bearings of the gear case part 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an automatic transmission, and more particularly to an automatic transmission in which a counter drive gear is installed on an input shaft and the counter drive gear is supported by an intermediate wall inside a transmission case.

Conventionally, an automatic transmission for a horizontally mounted engine is known. This type of automatic transmission generally includes an input shaft arranged coaxially with the crankshaft of the engine, a countershaft arranged in parallel to the input shaft, and an axle arranged in parallel. Is configured as a three-axis transaxle.
In such a three-axis automatic transmission, drive torque is transmitted from the input shaft to the counter shaft via the counter drive gear. When this counter drive gear is installed at the approximate center position of the input shaft, the counter drive gear is usually supported by an intermediate wall integrally provided in the transmission case in order to ensure the support rigidity of the counter drive gear. To be done.

  However, when this intermediate wall is provided in the center of the transmission case, it is necessary to assemble components such as a transmission gear and a clutch from the engine side and the non-engine side, which makes it difficult to assemble. There was a problem of becoming.

  In addition, when the intermediate wall is provided in the center of the transmission case, it is necessary to set a separate end cover on the non-engine side of the transmission case in order to ensure ease of assembly from the non-engine side. As a result, the installation range of the valve body attached to the transmission is limited.

  Therefore, the automatic transmission disclosed in Patent Document 1 below employs a structure in which the intermediate wall is provided separately from the transmission case and the counter drive gear is supported by the separate intermediate wall. .

  In this way, by configuring the intermediate wall as a separate body, the transmission case can be configured integrally including the end cover portion, so that the assembly work of the transmission gear, clutch, etc. can be performed from one side of the engine side. Can only be done. Moreover, the attachment range of the valve body of the transmission case can be expanded.

JP 2003-161450 A

  By the way, since the counter drive gear always meshes with the counter driven gear on the counter shaft and transmits the driving torque, it is required to reduce gear noise.

  In order to reduce the gear noise, it is necessary to stabilize the “tooth contact” by always keeping the positional relationship between the counter drive gear and the shaft member (input shaft or counter shaft) as another component constant.

  In this respect, in the case of Patent Document 1, the boss portion that is the support portion of the counter drive gear on the intermediate wall extends to the non-engine side (rear side) and supports the counter drive gear on its outer peripheral surface. It is necessary to improve the processing accuracy of the outer peripheral surface of this boss part, but the boss part extends to the anti-engine side and the outer peripheral surface is hidden by the intermediate wall, so it is necessary to process it separately from the transmission case, There is a problem that the positional relationship between the counter drive gear and the other shaft member cannot be made constant with high accuracy.

  Therefore, the present invention provides an automatic transmission in which an intermediate wall supporting the counter drive gear is configured separately from the transmission case, and the positional relationship between the counter drive gear and the other shaft member is accurately and constant to reduce gear noise. An object of the present invention is to provide an automatic transmission capable of reducing the transmission.

  The automatic transmission according to the present invention has a transmission case whose rear end side is integrally closed by a rear end bottom wall and has an opening on the front end side, and is housed in the transmission case and installed on the input shaft. A speed change mechanism, a counter drive gear that outputs an output from the speed change mechanism to a counter shaft arranged in parallel with the input shaft, and a support case that supports the counter drive gear and is detachable from the transmission case through the opening. The counter drive gear is formed with a cylindrical portion concentric with the input shaft, and the intermediate wall is formed with a through hole concentric with the input shaft. The inner peripheral surface of the through hole is configured to support the outer peripheral surface of the cylindrical portion.

According to the said structure, the cylinder part formed in the counter drive gear can be supported by the internal peripheral surface of the through-hole formed in the intermediate wall.
For this reason, the inner peripheral surface (support surface) of the through hole can be simultaneously cut in the step of cutting the bearing surface of the transmission case with the intermediate wall temporarily assembled in the transmission case. That is, the support surface that supports the shaft member of the transmission and the support surface that supports the counter drive gear can be co-processed.

In one embodiment of the present invention, a countershaft support recess for supporting the countershaft is formed in the transmission case, and the inner peripheral surface of the countershaft support recess and the inner peripheral surface of the through hole are formed from the same direction. It is set so that it can be processed.
According to the said structure, the internal peripheral surface of a countershaft support recessed part and the internal peripheral surface of a through-hole can be processed from the same direction (for example, the front end side which has an opening part).
For this reason, it is possible to co-process the counter shaft support recess and the through hole, and the positions of the inner peripheral surface of the counter shaft support recess supporting the counter shaft and the inner peripheral surface of the through hole supporting the counter drive gear are always Can be constant.
Therefore, the positional relationship between the counter shaft and the counter drive gear can always be made constant, the tooth contact of the counter drive gear can be made constant, and the generation of gear noise can be suppressed.

In one embodiment of the present invention, the cylindrical portion is formed on the rear end side of the counter drive gear, and the counter drive gear is disposed on the front end side of the intermediate wall.
According to the said structure, the counter drive gear can be assembled | attached to the front end side rather than an intermediate | middle wall by forming the cylinder part in the rear end side of the counter drive gear.
Therefore, even when the intermediate wall is assembled, the counter drive gear can be visually observed, and the assembly work of the counter drive gear and the like can be easily performed.

In one embodiment of the present invention, a substantially cylindrical outer peripheral cylindrical portion is provided at the outer peripheral end of the intermediate wall.
According to the said structure, an intermediate wall is formed in a substantially drum shape by providing the outer peripheral cylindrical part in the intermediate wall.
For this reason, the rigidity of the intermediate wall is higher than that of the flat plate member, and the support rigidity of the counter drive gear by the intermediate wall can be increased.
Therefore, the counter drive gear can be prevented from falling down and the contact of the counter drive gear can be made constant.

In one embodiment of the present invention, a multi-plate brake is provided that allows a predetermined rotating element of the transmission mechanism to be fixed to the transmission case, and a multi-plate brake pack is provided on the intermediate wall. It is a thing.
According to the above configuration, by providing the multi-plate brake pack on the intermediate wall, the multi-plate brake pack can be assembled to the separate intermediate wall in advance and then assembled to the transmission case.
Therefore, the assembly work of the multi-plate brake pack, the adjustment work, and the inspection work are not necessary on the main line for transmission assembly, and the transmission work is facilitated.
Also, by attaching the multi-plate brake pack to one intermediate wall, the excessive brake operating force of the multi-plate brake can be circulated in the intermediate wall, so that the brake operating force is applied to the bolts etc. that attach the intermediate wall. It does not occur and no load is generated on the bolts.
Therefore, the structure for attaching the intermediate wall to the transmission case can be simplified without requiring a reinforcing structure or the like.
Here, the “multi-plate brake pack” refers to a combination of not only the multi-plate friction plate but also the entire components of the multi-plate brake including a hydraulic piston, a hydraulic piston cylinder, a fixed friction plate support portion, and the like. .

In one embodiment of the present invention, the multi-plate brake pack is disposed on the opposite side of the counter drive gear in the axial direction.
According to the above configuration, the multi-plate brake pack and the counter drive gear are arranged in the axial direction across the intermediate wall.
Therefore, even if it is a case where a some component is assembled | attached to an intermediate wall, each component can be arrange | positioned compactly.

In an embodiment of the present invention, the automatic transmission is provided with a plurality of multi-plate brakes, and is set so that all the multi-plate brakes are arranged on the rear end side of the intermediate wall. .
According to the above configuration, all the multi-plate brakes are arranged on the rear end side of the intermediate wall.
Therefore, the assembly work to the transmission case until the intermediate wall is assembled can be performed more easily than the assembly of the multi-plate clutch requiring a centrifugal balance hydraulic chamber, etc. Attaching work can be easily performed.
In addition, the multi-plate brakes that are locked using the transmission case are arranged on the rear end side of the transmission case from the intermediate wall. Therefore, since it is not necessary to reduce the inner diameter of the transmission case, the intermediate wall can be easily assembled.
Therefore, it is possible to easily perform the assembling work of the intermediate wall while easily performing the assembling work until the intermediate wall is assembled.

According to the present invention, the support surface for supporting the shaft member of the transmission and the support surface for supporting the counter drive gear can be so-called co-processed in a state where the intermediate wall is temporarily assembled in the transmission case in advance.
Therefore, in the automatic transmission in which the intermediate wall supporting the counter drive gear is configured separately from the transmission case, the positional relationship between the counter drive gear and the other shaft member can be made constant with high accuracy, and gear noise can be reduced.

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

  FIG. 1 is a schematic cross-sectional view of an automatic transmission according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of the automatic transmission on the non-engine side, FIG. It is the work process figure which showed the processing assembly flow of the machine. The following description will be made with the engine side as the front end side and the non-engine side as the rear end side.

  As shown in FIG. 1, an automatic transmission T is disposed on the side of the engine E (in the vehicle width direction). The automatic transmission T includes an input shaft 1 disposed on the same axis as a crankshaft (not shown) of the engine E, a counter shaft 2 disposed in parallel with the input shaft 1, and these shafts. This is an automatic transmission T for a horizontally mounted engine having a so-called three-axis configuration, including an axle 3 arranged in parallel.

  On the input shaft 1 of the automatic transmission T, a transmission gear unit 4 that achieves the first to sixth gears and the reverse gear is installed. This transmission gear unit 4 is composed of a planetary gear set, a multi-plate clutch, a multi-plate brake, etc., but since it is not directly related to the present invention, only the outline line (dashed line) is shown in FIGS. It shows with.

  In addition, a counter drive gear 5 is provided at the center position of the input shaft 1 to output the drive torque changed by the transmission gear unit 4 to the counter shaft 2 side. The counter drive gear 5 is supported by an intermediate wall 6 described later.

  A counter driven gear 7 that meshes with the counter drive gear 5 is installed on the counter shaft 2. Further, a final drive gear 8 is provided at a position adjacent to the counter driven gear 7.

  Furthermore, a differential 9 is installed on the axle 3. A final driven gear 10 that meshes with the final drive gear 8 is fixed to the outer periphery of the differential 9. Note that the final drive gear 8, the differential gear 9, the final driven gear 10, and the like are also shown only by the outline line.

  The transmission gear unit 4 and the like configured as described above are accommodated in a substantially cylindrical transmission casing 11. The transmission casing 11 includes a gear case member 13 that is a bottomed cylindrical member having an opening 12 on the front end side, a front cover 14 that covers the opening 12 of the gear case member 13 from the front end side, and a counter drive gear 5. This is constituted by the intermediate wall 6 to be supported.

  The gear case member 13 has a first support recess 15 formed on the inner side surface of the rear end bottom wall 13 a corresponding to the position of the input shaft 1. In the first support recess 15, the input shaft 1 is supported by the inner peripheral surface 15a via the bearing member B1, and the transmission gear unit 4 is supported by the outer peripheral surface 15b via the bearing member B2.

  A second support recess 16 is formed on the inner surface of the rear end bottom wall 13b corresponding to the position of the counter shaft 2. The second support recess 16 is also configured to support the counter shaft 2 on the inner peripheral surface 16a via the bearing member B3. A recess 17 is formed in the second support recess 16 so as to correspond to the protrusion 2 a at the rear end of the counter shaft 2.

  In correspondence with the position of the axle 3, a circular drive shaft through hole 18 is formed in the rear end bottom wall 13c. The differential device 9 is supported by an inner peripheral surface 18a of the drive shaft through hole 18 via a bearing member B4.

  On the other hand, the front cover 14 is formed with a front through hole 19 at a position corresponding to the input shaft 1, and the input shaft 1 is inserted therethrough.

  Further, a third support recess 20 is formed at a position corresponding to the counter shaft 2, and the counter shaft 2 is supported via the bearing member B5. The third support recess 20 is also formed with a recess 21 so as to correspond to the protrusion 2b at the front end of the counter shaft 2.

  A circular drive shaft through hole 22 is formed corresponding to the position of the axle 3. The differential device 9 is also supported by the inner peripheral surface 22a of the drive shaft through hole 22 via the bearing member B6.

  In this way, the input shaft 1, the counter shaft 2, and the axle 3 are all supported by the gear case member 13 and the front cover 14 with substantially two-sided two-point support.

  The gear case member 13 and the front cover 14 are configured to be fastened and fixed via a plurality of fastening bolts 23 (only one is shown in FIG. 1) at a fastening flange 13d formed at the outer peripheral end.

  The intermediate wall 6 includes a support cylinder hole 61 that supports the counter drive gear 5 via a ball bearing B7, a vertical wall part 62 that extends from the support cylinder hole 61 to the outer peripheral side, and an outer peripheral end of the vertical wall part 62. And an outer peripheral cylindrical portion 63 extending from the rear end side to the rear end side.

  By supporting the counter drive gear 5 with the intermediate wall 6, the support rigidity of the counter drive gear 5 is increased.

  The intermediate wall 6 is detachably fixed to the gear case member 13 by fastening bolts 64 provided so as to be able to be inserted therethrough.

In this way, by forming the intermediate wall 6 separately from the gear case member 13, the gear case member 13 itself can be configured as a single member without being divided by the rear cover or the like.
Therefore, a wide attachment range of a valve body (not shown) can be secured on the outer surface of the gear case member 13, and a valve body that is increased in size and increased in size can be easily attached.

  Further, since the intermediate wall 6 can be separated, it is only necessary to assemble the structure such as the transmission gear unit 4 inside the gear case member 13 from the front end side, so that the assembly work of the automatic transmission T can be easily performed.

  The detailed structure of the intermediate wall 6 will be described with reference to FIG.

  As described above, the intermediate wall 6 has a substantially drum shape including the support cylinder hole portion 61, the vertical wall portion 62, and the outer peripheral cylindrical portion 63.

  The intermediate wall 6 is formed with a plurality of bolt insertion holes 65 (only one is shown in FIG. 3) in the outer peripheral cylindrical portion 63, and is a fastening bolt 64 that passes through the bolt insertion hole 65, and the gear case member 13. Mounted on.

  A spline groove 66 for spline fitting a fixed friction plate 36 of a first brake pack, which will be described later, is formed on the inner peripheral surface of the outer cylindrical portion 63. Further, the rear end side surface 62a of the vertical wall portion 62 constitutes the first piston cylinder 34 by assembling a first piston plate described later.

  And in the support cylinder hole part 61, it comprises so that the counter drive gear 5 may be supported by the internal peripheral surface 61a. As will be described later, the inner peripheral surface 61a is temporarily fixed to the gear case portion 13 for cutting. A C-ring fitting groove 61b is formed at the center of the inner peripheral surface 61a.

The peripheral structure with the intermediate wall 6 assembled will be described in detail with reference to FIG.
The intermediate wall 6 is assembled to the gear case member 13 so that the rear end portion of the outer peripheral cylindrical portion 63 abuts on a step portion 13f provided on the inner wall surface 13e of the gear case member 13.

  A first brake pack 30 (for example, an L / R brake device) is installed on the inner peripheral side of the outer peripheral cylindrical portion 63 of the intermediate wall 6.

  The first brake pack 30 includes a first piston 31, a return spring 32, a spring locking plate 33, a first piston cylinder 34, a rotational friction plate 35, a fixed friction plate 36, a retaining plate 37, A snap ring 38 is used.

  Then, by supplying oil into the first piston cylinder 34, the multi-plate friction plates 35 and 36 are pressed to brake the rotating element 4a of the transmission gear unit 4.

  A one-way clutch 40 is provided on the rear end side of the intermediate wall 6. The one-way clutch 40 regulates the rotation direction of the rotating element 4 a that applies the brake by the first brake pack 30.

  Further, a second brake pack 50 (for example, a 2-6 brake device) is installed on the rear end side of the one-way clutch 40. The second brake pack 50 includes a second piston plate 51, a return spring (not shown), a second piston cylinder 52, a rotational friction plate 53, a fixed friction plate 54, and a snap ring 55. Also in the second brake pack 50, the oil is supplied into the second piston cylinder 52 so as to brake the rotating element 4 b of the transmission gear unit 4.

  A third brake pack 56 (for example, a 3-5-R brake device) is installed on the rear end side of the second brake pack 50. The third brake pack 56 includes a third piston plate 57, a return spring (not shown), a third piston cylinder 58, a rotational friction plate 59, and a fixed friction plate 60. Even in the third brake pack 56, the oil is supplied into the third piston cylinder 58 to brake the rotating element 4 c of the transmission gear unit 4.

As described above, only the multi-plate brake packs 30, 50, and 56 are assembled between the intermediate wall 6 and the rear end bottom wall 13 a of the gear case member 13.
By configuring in this way, it is not necessary to assemble parts constituting the centrifugal balance hydraulic chamber as in the case of a multi-plate clutch, and therefore, the assembling work to the gear case member 13 up to the intermediate wall 6 is facilitated.

  Further, the inner wall surface 13e of the gear case member 13 protrudes toward the inner peripheral side so as to lock and fix the fixed friction plates 54 and 60 only between the rear end bottom wall 13a and the stepped portion 13f to which the intermediate wall 6 is attached. You can do it. For this reason, the insertion into the gear case member 13 is facilitated, and the assembly work of the intermediate wall 6 is also facilitated.

  A ball bearing B7 is disposed on the inner peripheral side of the support cylinder hole 61 of the intermediate wall 6, and the counter drive gear 5 is rotatably supported via the ball bearing B7.

  The counter drive gear 5 has a cylindrical portion 5A extending to the rear end side, and is configured to be supported by the support cylinder hole portion 61 via the ball bearing B7 on the outer peripheral surface 5Aa of the cylindrical portion 5A.

  The counter drive gear 5 is installed so as to be positioned on the front end side with respect to the intermediate wall 6. For this reason, the counter drive gear 5 can be visually observed from the opening 12 side in a state where the intermediate wall 6 is assembled to the gear case member 13.

  Next, processing and assembling steps of the automatic transmission T will be described with reference to FIG.

  First, at S1, the intermediate wall 6 is cut. In this cutting process, cutting is performed only on the intermediate wall 6. In this cutting process, the inner peripheral surface 61a of the support cylinder hole 61 is formed by roughing.

  Next, in S <b> 2, the intermediate wall 6 is temporarily assembled and fixed to the gear case member 13. In this temporary assembly fixing, the intermediate wall 6 is fastened and fixed inside the gear case member 13 without assembling anything.

In S3, the gear case member 13 and the intermediate wall 6 are so-called co-processed.
Specifically, a reference point (not shown) is set by fixing the gear case member 13 to a jig (not shown), and the second of the gear case member 13 is set based on this reference point. The inner peripheral surface 16a of the support recess 16 and the inner peripheral surface 61a of the support tube hole 61 of the intermediate wall 6 are cut.

  For this reason, the position of the inner peripheral surface 16a of the second support recessed portion 16 and the position of the inner peripheral surface 61a of the support cylinder hole portion 61 can be processed at a constant position with high accuracy.

  Thereafter, in S4, the intermediate wall 6 is removed from the gear case member 13. By removing in this way and once separating the gear case member 13 and the intermediate wall 6 from each other, the respective parts are assembled to each other.

  About the gear case member 13, it transfers to S5 and a multi-plate brake pack etc. are assembled | attached. Specifically, the third brake pack 56, the second brake pack 50, and the one-way clutch 40 are sequentially assembled from the rear end bottom wall 13a side. Thus, the components on the rear end side from the intermediate wall 6 are assembled in the gear case member 13 in advance.

  On the other hand, about the intermediate wall 6, it transfers to S6 and the 1st brake pack 30 grade | etc., Is assembled | attached. Specifically, the rotary friction plate 35, the fixed friction plate 36, and the like are assembled in a subline of the assembly line, and all the elements of the first brake pack 30 are assembled. At this time, clearance adjustment work between the friction plates 35 and 36, inspection work of the first brake pack 30, and the like are also performed.

  Next, in S <b> 7, the counter drive gear 5 is assembled to the intermediate wall 6. Here, by assembling the counter drive gear 5 to the intermediate wall 6 as well, all the components supported by the intermediate wall 6 can be assembled in the sub-line, and the main line can be shortened.

  In S <b> 8, the assembly of the intermediate wall 6 (the assembly of the first brake pack 30 and the counter drive gear 5 is assembled to the intermediate wall 6) is assembled to the gear case member 13. Here, the intermediate wall 6 and the gear case member 13 are integrated by assembling the assembly of the intermediate wall 6 assembled in the subline to the gear case member 13.

  Thereafter, in S9, other components such as a multi-plate clutch pack are assembled to the gear case member 13. As a result, the transmission gear unit 4 and the like are all assembled in the gear case member 13.

  Finally, in S10, the front cover 14 is assembled so as to cover the opening 12 of the gear case member 13. Thus, the automatic transmission T is completed.

  As described above, the separable intermediate wall 6 is once assembled to the gear case member 13 and co-processed together with the gear case member 13, so that the inner peripheral surface 61 a of the support cylinder hole 61 of the intermediate wall 6 is formed. Processing accuracy can be increased.

  For this reason, the positional accuracy of the counter drive gear 5 can be improved, and the tooth contact with the counter driven gear 7 can always be constant.

Next, the effect of this embodiment comprised in this way is demonstrated.
In the automatic transmission T of this embodiment, the counter drive gear 5 is formed with a cylindrical portion 5A concentric with the input shaft 1, and the intermediate wall 6 is provided with a support cylinder hole portion 61 concentric with the input shaft 1. The inner peripheral surface 61a of the support cylinder hole 61 is configured to support the outer peripheral surface 5Aa of the cylindrical portion 5A.

Accordingly, the cylindrical portion 5 </ b> A of the counter drive gear 5 can be supported by the inner peripheral surface 61 a of the support cylinder hole portion 61 of the intermediate wall 6.
For this reason, in the process of cutting the bearing surface (16a) of the gear case member 13 with the intermediate wall 6 temporarily assembled to the gear case member 13 in advance, the inner peripheral surface 61a of the support tube hole 61 is simultaneously cut. can do. That is, the support surface (16a) for supporting the shaft member of the gear case member 13 and the support surface (61a) for supporting the counter drive gear 5 can be so-called co-processed.
Therefore, in the automatic transmission T in which the intermediate wall 6 that supports the counter drive gear 5 is configured separately from the gear case member 13, the positional relationship between the counter drive gear 5 and the counter shaft 2 is accurately and constant, and the gear noise. Can be reduced.

  In addition, since the relationship with the 1st support recessed part 15 which supports the input shaft 1 can always be made constant, the positional relationship between the counter drive gear 5 and the input shaft can be made constant accurately.

In particular, in this embodiment, the inner peripheral surface 16a of the second support recess 16 and the inner peripheral surface 61a of the support cylinder hole 61 are set so as to be processed from the front end side.
Thereby, the inner peripheral surface 16 a of the second support recessed portion 16 and the inner peripheral surface 61 a of the support cylinder hole portion 61 can be processed together from the opening portion 13.
For this reason, the positions of the inner peripheral surface 16a of the second support recess 16 that supports the counter shaft 2 and the inner peripheral surface 61a of the support cylinder hole portion 61 that supports the counter drive gear 5 can be surely kept constant. it can.
Therefore, the positional relationship between the counter shaft 2 and the counter drive gear 5 can be made constant at all times, the tooth contact of the counter drive gear 5 can be made constant, and the occurrence of gear noise can be suppressed.

In this embodiment, the cylindrical portion 5 </ b> A of the counter drive gear 5 is formed on the rear end side of the counter drive gear 5, and the counter drive gear 5 is disposed on the front end side of the intermediate wall 6.
Thereby, the counter drive gear 5 can be assembled to the front end side of the intermediate wall 6.
Therefore, even when the intermediate wall 6 is assembled, the counter drive gear 5 can be visually observed, and the assembly work of the counter drive gear 5 and the like can be easily performed.

In this embodiment, a substantially cylindrical outer peripheral cylindrical portion 63 is provided on the intermediate wall 6.
Thereby, the intermediate wall 6 is formed in a substantially drum shape.
For this reason, the rigidity of the intermediate wall 6 is higher than that of the flat plate member, and the support rigidity of the counter drive gear 5 by the intermediate wall 6 can be increased.
Therefore, the counter drive gear 5 can be prevented from falling and the tooth contact of the counter drive gear 5 can be made constant.

In this embodiment, the first brake pack 30 is assembled to the intermediate wall 6.
Thus, the first brake pack 30 can be assembled to the separate intermediate wall 6 in advance and then assembled to the gear case member 13.
Therefore, in the assembly main line of the automatic transmission, assembly work, adjustment work, inspection work and the like of the first brake pack 30 are not required, and the assembly work of the automatic transmission T is facilitated.
Further, since the excessive brake operating force of the first brake pack 30 can be circulated inside the intermediate wall 6 by assembling the first brake pack 30 to the single intermediate wall 6, the intermediate wall 6 is geared. A brake operating force is not generated on the fastening bolt 64 attached to the case member 13, and it is not necessary to provide a reinforcing structure on the fastening bolt 64.
Therefore, the attachment structure of the intermediate wall 6 to the gear case member 13 can be simplified without requiring a reinforcing structure or the like.
In this embodiment, the first brake pack 30 is arranged on the rear end side of the intermediate wall 6.
Thus, the first brake pack 30 and the counter drive gear 5 are arranged side by side in the axial direction with the intermediate wall 6 interposed therebetween.
Therefore, even when the first brake pack 30 and the counter drive gear 5 are supported by the intermediate wall 6, the constituent elements (30, 5) can be arranged in a compact manner.

In this embodiment, all the multi-plate brake packs, specifically, the first brake pack 30, the second brake pack 50, and the third brake pack 56 are arranged on the rear end side of the intermediate wall 6. Is set.
As a result, all the multi-plate brake packs (30, 50, 56) are arranged on the rear end side with respect to the intermediate wall 6, so that the assembly to the gear case member 13 until the intermediate wall 6 is assembled is performed. The operation can be performed more easily than the assembly of a multi-plate clutch pack (not shown), and the assembly operation of the automatic transmission T can be performed easily.
Further, since the multi-plate brake pack (50, 56) that is locked using the gear case member 13 is disposed on the rear end side of the gear case member 13 from the intermediate wall 6, the multi-plate brake pack (50, 56). For this reason, it is not necessary to reduce the inner diameter of the gear case member 13 between the opening 12 and the attachment position (13f) of the intermediate wall 6, so that the insertion of the intermediate wall 6 is facilitated and the assembling work is also facilitated. It can be done easily.
Therefore, it is possible to easily perform the assembling work of the intermediate wall 6 while easily performing the assembling work until the intermediate wall 6 is assembled.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The transmission case of the present invention corresponds to the gear case member 13 of the embodiment,
Similarly,
The speed change mechanism corresponds to the speed change gear unit 4,
The cylinder portion of the counter drive gear corresponds to the cylindrical portion 5A of the counter drive gear 5,
The through hole corresponds to the support tube hole 61,
The countershaft support recess corresponds to the second support recess 16,
The present invention is not limited to the above-described embodiments, but includes embodiments applied to all automatic transmissions.

  In the present embodiment, the intermediate wall 6 is formed in a substantially drum shape, but in addition, it may be formed in a flat plate shape and a through hole for supporting the counter drive gear 5 may be formed in the center.

  Further, the automatic transmission T has been described on the assumption of a 6-speed transmission, but the present invention may be applied to other automatic transmissions having other stages.

1 is a schematic cross-sectional view of an automatic transmission according to an embodiment of the present invention. The principal part sectional drawing of the non-engine side of an automatic transmission. Sectional drawing of a single intermediate wall. The operation process figure which showed the processing assembly flow of the automatic transmission.

Explanation of symbols

T ... automatic transmission 1 ... input shaft 2 ... counter shaft 3 ... axle 4 ... transmission gear unit 5 ... counter drive gear 6 ... intermediate wall 11 ... transmission casing 13 ... gear case member 14 ... front cover 15 ... first support recess 16 ... 2nd support recessed part 16a ... Inner peripheral surface 61 ... Supporting cylinder hole part 61a ... Inner peripheral surface

Claims (7)

A transmission case whose rear end side is integrally closed by a rear end bottom wall and having an opening on the front end side;
A transmission mechanism housed in the transmission case and installed on the input shaft;
A counter drive gear for outputting an output from the speed change mechanism to a counter shaft arranged in parallel with the input shaft;
An automatic transmission comprising an intermediate wall that supports the counter drive gear and is detachable from the transmission case through the opening,
In the counter drive gear, a cylindrical portion concentric with the input shaft is formed,
In the intermediate wall, a through hole concentric with the input shaft is formed,
An automatic transmission configured to support an outer peripheral surface of the cylindrical portion with an inner peripheral surface of the through hole. Forming a counter shaft support recess for supporting the counter shaft in the transmission case;
The automatic transmission according to claim 1, wherein the inner peripheral surface of the counter shaft support recess and the inner peripheral surface of the through hole are set so as to be processed from the same direction. The tube portion is formed on the rear end side of the counter drive gear,
The automatic transmission according to claim 1 or 2, wherein the counter drive gear is disposed on the front end side of the intermediate wall. The automatic transmission according to any one of claims 1 to 3, wherein a substantially cylindrical outer peripheral cylindrical portion is provided at an outer peripheral end of the intermediate wall. A multi-plate brake that allows a predetermined rotating element of the transmission mechanism to be fixed to the transmission case;
The automatic transmission according to claim 4, wherein the intermediate wall includes a multi-plate brake pack. The automatic transmission according to claim 5, wherein the multi-plate brake pack is disposed on the opposite side of the counter drive gear in the axial direction. The automatic transmission is provided with a plurality of multi-plate brakes,
The automatic transmission according to any one of claims 1 to 6, wherein all of the multi-plate brakes are arranged on the rear end side of the intermediate wall.

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