阅读说明：本技术 变速器及其制造方法 (Transmission and method for manufacturing the same ) 是由 石川靖浩 于 2019-01-28 设计创作，主要内容包括：自动变速器(1)具有：具有支承部件(12)的液力变矩器(2)、设置在支承部件(12)的内周的输入轴(10)、夹持在支承部件(12)与输入轴(10)之间的密封圈(S1)、夹持在支承部件(12)与输入轴(10)之间并具有设置在比密封圈(S1)更靠输入轴(10)的前端(10a)侧的轴套(125)。输入轴(10)具有与密封圈(S1)接触的大径部(102)和位于比大径部(102)更靠前端(10a)侧且直径比大径部(102)小的小径部(101)。密封圈(S1)的内径(r2)比轴套(125)的外径(r1)大。小径部(101)的轴长度(L3)被设定为比从轴套(125)的卡合开始点(b2)至密封圈(S1)的距离长。通过这种结构,可以防止将液力变矩器组装到输入轴时密封圈的损伤。(An automatic transmission (1) is provided with: a torque converter (2) having a support member (12), an input shaft (10) provided on the inner periphery of the support member (12), a seal ring (S1) sandwiched between the support member (12) and the input shaft (10), and a sleeve (125) sandwiched between the support member (12) and the input shaft (10) and provided on the tip (10a) side of the input shaft (10) with respect to the seal ring (S1). The input shaft (10) has a large diameter section (102) that contacts the seal ring (S1), and a small diameter section (101) that is located on the tip (10a) side of the large diameter section (102) and has a smaller diameter than the large diameter section (102). The inner diameter (r2) of the seal ring (S1) is larger than the outer diameter (r1) of the bushing (125). The axial length (L3) of the small-diameter section (101) is set to be longer than the distance from the engagement starting point (b2) of the boss (125) to the seal ring (S1). With this configuration, the seal ring can be prevented from being damaged when the torque converter is assembled to the input shaft.)

1. A transmission, having:

a torque converter having a hollow shaft;

a transmission input shaft provided on an inner periphery of the hollow shaft;

a seal member sandwiched between the hollow shaft and the transmission input shaft;

a sleeve that is interposed between the hollow shaft and the transmission input shaft and is provided on a tip end side of the transmission input shaft with respect to the seal member,

the transmission input shaft has a large diameter portion that contacts the seal member and a small diameter portion that is located on a front end side of the large diameter portion and has a smaller diameter than the large diameter portion,

the diameter of the seal member is set larger than the diameter of the sleeve,

the shaft length of the small diameter portion is set to be longer than the distance from the insertion inlet of the transmission input shaft of the boss to the seal member.

2. The transmission of claim 1,

the shaft length of the small diameter portion is set to be shorter than a distance from an insertion inlet of the transmission input shaft of the boss to the seal member.

3. The transmission of claim 1 or 2,

the small diameter portion has an oil hole for supplying operating oil to a lock-up clutch of the torque converter between the boss and the seal member.

4. The transmission according to any one of claims 1 to 3,

the axial length from one end of the small diameter portion to the other end of the spline formed in the large diameter portion is set to be shorter than the axial length from one end of the boss to one end of the spline formed on the inner periphery of the turbine hub in the torque converter.

5. A method of manufacturing a transmission, the transmission having:

a torque converter having a hollow shaft;

a transmission input shaft provided on an inner periphery of the hollow shaft and having a small diameter portion and a large diameter portion having a larger diameter than the small diameter portion;

a seal member sandwiched between the hollow shaft and the transmission input shaft;

a sleeve which is interposed between the hollow shaft and the transmission input shaft, is provided on a tip end side of the transmission input shaft with respect to the seal member, and has a diameter smaller than that of the seal member,

when the torque converter is assembled to the transmission input shaft, the torque converter is pushed in, and the small diameter portion is extended without the seal member contacting the large diameter portion, and then the torque converter is further pushed in, and the large diameter portion and the seal member contact each other.

Technical Field

The invention relates to a transmission and a method of manufacturing the same.

Background

Patent document 1 discloses an automatic transmission having a seal member inside a hollow shaft of a torque converter.

Fig. 7 is a diagram illustrating a conventional automatic transmission 300, which is a diagram illustrating a state in which the torque converter 2 and the input shaft 100 are assembled. (a) The cross-sectional view is an enlarged view of the periphery of the fitting portion between the torque converter 2 and the input shaft 100. (b) The torque converter 2 is assembled (mounted) to the input shaft 100.

As shown in fig. 7 (a), the torque converter 2 includes a pump impeller 21, a turbine runner 22, and a stator 23.

The pump impeller 21 and the turbine runner 22 are provided so as to be relatively rotatable on a common rotation axis X. A stator 23 supported by the stator shaft 11 is located between the pump impeller 21 and the turbine runner 22.

The turbine runner 22 is spline-fitted to an input shaft 100 (input shaft) extending from a transmission mechanism portion (not shown) of the automatic transmission 300 via a turbine hub 60.

In the torque converter 2, a rotational driving force of an engine, not shown, is input to the pump impeller 21, and the pump impeller 21 rotates about the rotation axis X.

When the pump impeller 21 rotates, the rotation of the pump impeller 21 is transmitted to the turbine runner 22 via the hydraulic oil in the torque converter 2, and the turbine runner 22 rotates about the rotation axis X.

The turbine hub 60 that supports the turbine runner 22 is fitted to a spline fitting portion 104 provided to the input shaft 100 so as not to be relatively rotatable, and when a rotational driving force is transmitted to the turbine runner 22, the turbine runner 22 and the input shaft 100 are integrally rotated about the rotation axis X with the transmitted rotational driving force.

The small diameter portion 101 inserted into the torque converter 2 on the inner diameter side is rotatably supported by the support member 16 connected to the torque converter cover 24 on the input shaft 100.

The support member 16 is composed of a cylindrical base portion 161 and a flange portion 162 extending in the radial direction from one end of the base portion 161.

The small diameter portion 101 of the input shaft 100 is inserted into a cylindrical base portion 161, and is rotatably provided in the base portion 161 via a boss 125 provided on an inner periphery 161a of the base portion 161.

The boss 125 is provided to improve the output accuracy (center axis alignment accuracy at the time of assembly) of the input shaft 100.

A seal ring S1 is provided on the inner periphery of the base 161 at a position distant from the boss 125 in the rotation axis X direction. The seal ring S1 protrudes radially inward from the inner periphery of the base 161 and is in pressure contact with the outer periphery of the small diameter portion 101.

As shown in fig. 7 (b), when manufacturing the automatic transmission 300, the torque converter 2 assembled in advance is externally inserted to the input shaft 100 from the rotation axis X direction, and the torque converter 2 and the input shaft 100 are assembled.

In the automatic transmission 300 shown in fig. 7, the small diameter portion 101 of the input shaft 100 is inserted into the cylindrical base portion 161 of the support member 16 before the turbine hub 60 is fitted to the spline portion 104 of the input shaft 100.

Further, at a stage before the turbine hub 60 is fitted to the spline portion 104, the shaft alignment of the input shaft 100 and the support member 16 is incomplete.

Therefore, the small diameter portion 101 of the input shaft 100 may be inserted into the cylindrical base portion 161 in a state inclined with respect to the rotation axis X.

In this case, the small diameter portion 101 of the input shaft 100 may be caught by the seal ring S1 protruding from the inner periphery of the base portion 161, and the seal ring S1 may be damaged.

Disclosure of Invention

Therefore, it is required that the seal ring is not damaged when the torque converter is assembled to the input shaft.

The invention provides a transmission and a manufacturing method thereof, which allow a seal ring not to be damaged.

The transmission of the present invention includes:

a torque converter having a hollow shaft;

a transmission input shaft provided on an inner periphery of the hollow shaft;

a seal member sandwiched between the hollow shaft and the transmission input shaft;

a sleeve that is interposed between the hollow shaft and the transmission input shaft and is provided on a tip end side of the transmission input shaft with respect to the seal member,

the transmission input shaft has a large diameter portion that contacts the seal member and a small diameter portion that is located on a front end side of the large diameter portion and has a smaller diameter than the large diameter portion,

the diameter of the seal member is set larger than the diameter of the sleeve,

the shaft length of the small diameter portion is set to be longer than the distance from the insertion inlet of the transmission input shaft of the boss to the seal member.

The present invention provides a method for manufacturing a transmission, the transmission having:

a torque converter having a hollow shaft;

a transmission input shaft provided on an inner periphery of the hollow shaft and having a small diameter portion and a large diameter portion having a larger diameter than the small diameter portion;

a seal member sandwiched between the hollow shaft and the transmission input shaft;

a sleeve which is interposed between the hollow shaft and the transmission input shaft, is provided on a tip end side of the transmission input shaft with respect to the seal member, and has a smaller diameter than the seal member,

when the torque converter is assembled to the transmission input shaft, the torque converter is pushed in, and the small diameter portion is extended without the seal member contacting the large diameter portion, and then the torque converter is further pushed in, and the large diameter portion and the seal member contact each other.

According to the present invention, the seal ring can be prevented from being damaged when the torque converter is assembled to the input shaft.

Drawings

Fig. 1 is a diagram illustrating a main portion of an automatic transmission of an embodiment.

Fig. 2 is an enlarged view showing the periphery of the support member shown in fig. 1.

Fig. 3 is a diagram illustrating an assembly process of the torque converter and the input shaft shown in fig. 1.

Fig. 4 is a diagram illustrating an assembly process of the torque converter and the input shaft shown in fig. 1.

Fig. 5 is a diagram illustrating an assembly process of the torque converter and the input shaft shown in fig. 1.

Fig. 6 is a diagram illustrating an assembly process of the torque converter and the input shaft shown in fig. 1.

Fig. 7 is a diagram illustrating a main portion of an automatic transmission of a conventional example.

Detailed Description

Hereinafter, embodiments of the present invention will be described.

Fig. 1 is a diagram illustrating an automatic transmission 1 (transmission) according to an embodiment, and is a diagram illustrating a state in which a torque converter 2 and an input shaft 10 are assembled.

Fig. 2 is an enlarged view showing the periphery of the support member 12 of fig. 1. Fig. 2 (a) is an enlarged view of the periphery of the support member 12, and (b) is a view of the support member 12 and the input shaft 10 spaced apart in the direction of the rotation axis X.

In an automatic transmission 1 of a vehicle, a rotational driving force of an engine (not shown) is transmitted to an input shaft 10 extending from a transmission mechanism (not shown) via a torque converter 2.

As shown in fig. 1, the input shaft 10 is rotatably supported at a longitudinal distal end 10a side by a support member 12 on the torque converter 2 side.

On the front end 10a side of the input shaft 10, regions of the small diameter portion 101 and the large diameter portion 102 close to the small diameter portion 101 are rotatably supported by the support member 12.

As shown in fig. 2, the large diameter portion 102 is formed of an outer diameter R2 larger than the outer diameter R1 of the small diameter portion 101. The region between the small diameter portion 101 and the large diameter portion 102 is an enlarged diameter portion 103 whose outer diameter becomes larger as going from the small diameter portion 101 to the large diameter portion 102.

An oil hole 101a for supplying working oil to the lock mechanism 4 is opened between the small diameter portion 101 and the enlarged diameter portion 103.

In the large diameter portion 102, a spline portion 104 is provided on the outer periphery of a position distant from a boundary with the enlarged diameter portion 103 (an engagement start point a3 described later), and the spline 61s of the turbine hub 60 on the torque converter 2 side is spline-fitted to the spline 104s of the spline portion 104.

In the large diameter portion 102, an outer periphery 102a of a region on the side of the small diameter portion 101 (left side in the figure) with respect to the spline portion 104 is supported by the support member 12 on the torque converter 2 side.

The support member 12 is integrally formed of a cylindrical base portion 121, a bottom wall portion 120 that seals one end of the base portion 121, and a large-diameter support portion 122 that extends radially outward from the outer periphery of the other end side (the transmission mechanism side) of the base portion 121. The support member 12 may also be referred to as a hollow shaft.

The support member 12 is inserted into a fitting hole 241 provided in the torque converter cover 24 from the engine side (left side in the drawing) not shown.

In this state, the support member 12 is positioned on the rotation axis X, and the torque converter cover 24 is welded and fixed to the outer periphery of the bottom wall portion 120 side (left side in the drawing) at the large-diameter support portion 122 of the support member 12.

The piston 44 of the lock mechanism 4 is positioned on the outer diameter side of the large diameter support portion 122, and the cylindrical portion 441 on the inner diameter side of the piston 44 is spline-fitted to the outer periphery of the large diameter support portion 122. In this state, the piston 44 is provided so as to be able to advance and retreat in the direction of the rotation axis X in a state where the relative rotation with the support member 12 is restricted.

Large diameter support portion 122 is formed with an inner diameter r2 that is larger than inner diameter r1 of base portion 121. A support hole 13 of the input shaft 10 is formed inside the support member 12. The support hole 13 is formed by connecting a small-diameter hole portion 131 on the bottom wall portion 120 side and a large-diameter hole portion 132 adjacent to the small-diameter hole portion 131 in series.

The support member 12 is provided with the large diameter hole portion 132 facing the transmission mechanism portion side (right side in the drawing).

An end surface 122a of the large-diameter support portion 122 on the transmission mechanism portion side (right side in the drawing) is a flat surface perpendicular to the rotation axis X, and a concave groove 123 and an annular groove 124 are provided on the end surface 122 a.

The recessed groove 123 is provided along the outer peripheral edge of the large diameter hole portion 132 of the support hole 13, and the annular groove 124 is provided radially outward of the recessed groove 123 so as to surround the support hole 13 at a predetermined interval.

In the groove 123 and the annular groove 124, seal rings S1 and S2 are respectively attached from the rotation axis X direction.

The disk portion 451 on the inner diameter side of the spring holder 45 is assembled to the end surface 122a of the large diameter support portion 122 from the rotation axis X direction.

Therefore, when the spring holder 45 is fixed to the large-diameter support portion 122 with the bolt B, the seal rings S1 and S2 are pressed against the spring holder 45, and the gap between the end surface 122a of the large-diameter support portion 122 and the spring holder 45 is sealed.

In this state, the seal ring S1 protrudes from the inner periphery of the large diameter hole portion 132 of the support hole 13 and is pressed against the outer periphery of the large diameter portion 102 of the input shaft 10.

In the support hole 13, an annular boss 125 is provided on the inner periphery of the small-diameter hole portion 131 adjacent to the large-diameter hole portion 132. The sleeve 125 is formed with an inner diameter corresponding to the outer diameter R1 of the small-diameter portion 101 on the input shaft 10 side and an outer diameter corresponding to the inner diameter R1 of the small-diameter hole portion 131 of the support hole 13.

The sleeve 125 is formed of an outer diameter r1 smaller than an inner diameter r3 of the seal ring S1 before pressure contact with the outer periphery of the small diameter portion 101 (r3 > r 1).

In the small-diameter hole 131, a cylindrical boss 125 is provided in an orientation along the rotation axis X.

When the torque converter 2 is assembled to the input shaft 10, the small diameter portion 101 of the input shaft 10 penetrates the inside of the boss 125 along the rotation axis X direction.

An end portion of the sleeve 125 on the transmission mechanism side (right side of fig. 2 b) serves as an inlet (insertion inlet 125a) of the input shaft 10 when the torque converter 2 is assembled to the input shaft 10, and an end portion on the other side serves as an outlet (insertion outlet 125b) of the input shaft.

In the support member 12, the small-diameter portion 101 on the input shaft 10 side is rotatably supported in the region of the small-diameter hole portion 131 via the boss 125, and the large-diameter portion 102 on the input shaft 10 side is rotatably supported in the region of the large-diameter hole portion 132.

A spline 104s is provided on the outer periphery of the large-diameter portion 102 of the input shaft 10 at a position where interference with the spring holder 45 is avoided, and the spline 61s of the turbine hub 60 is fitted to the spline 104 s.

As shown in fig. 1, in the turbine hub 60, a circular plate portion 62 extending in the radial direction is provided at an end portion of the cylindrical portion 61 on the spring holder 45 side (left side in the drawing). The drive plate 65 of the damper device 6 is coupled to the outer periphery of the disc portion 62.

The cylindrical portion 61 is connected to the outer periphery of a position adjacent to the disk portion 62 so as to be relatively non-rotatable, by a connecting member 25 connected to the inner diameter side of the turbine runner 22.

The cylindrical portion 61 is provided with an annular wall portion 63 at an end opposite to the support member 12.

The annular wall 63 extends along the rotation axis X in a direction away from the support member 12 (rightward in the drawing).

The front end 63a side of the annular wall 63 is formed to have a length La in the rotation axis X direction reaching the outer diameter side of the front end 111 of the stator shaft 11.

The seal ring S3 is fitted to the outer periphery of the recessed groove 111b in the distal end 111 of the stator shaft 11.

The seal ring S3 is pressed against the inner periphery of the annular wall portion 63, and the gap between the outer periphery of the stator shaft 11 and the inner periphery of the annular wall portion 63 is sealed by the seal ring S3.

The stator shaft 11 is a cylindrical member that is externally inserted into the input shaft 10, and a base end of the stator shaft 11 is fixed to a fixed-side member 15 of a transmission, not shown.

The stator shaft 11 is provided with a coupling portion 112 with the inner race 271 adjacent to the distal end portion 111.

The coupling portion 112 is formed with an outer diameter R4 larger than the outer diameter R3 of the distal end portion 111. A spline 112s is formed in a predetermined range on the distal end portion 111 side on the outer periphery of the coupling portion 112.

The inner race 271 supporting the one-way clutch 27 is fitted to the spline 112s of the coupling portion 112.

A sleeve 5 is provided on the outer diameter side of the stator shaft 11. The sleeve 5 is provided to transmit the rotation of the pump impeller 21 of the torque converter 2 to the oil pump (not shown) side.

The sleeve 5 includes a cylindrical portion 51 surrounding the outer periphery of the stator shaft 11, and a circular plate portion 52 extending radially outward from an end of the cylindrical portion 51 on the one-way clutch 27 side, and the pump impeller 21 is fixed to the outer periphery of the circular plate portion 52.

The cylindrical portion 51 includes a fitting portion 510 having a spline 51s provided on the outer periphery thereof, and a connecting portion 511 connecting the fitting portion 510 and the disk portion 52. Fitting portion 510 and connection portion 511 have the same inner diameter R5, and fitting portion 510 is formed of an outer diameter R6 smaller than outer diameter R7 of connection portion 511. The spline 51s of the fitting portion 510 is located on the inner diameter side of the outer periphery 511a of the connecting portion 511.

The cylindrical rotation transmission member 91 is located on the outer periphery of the connection portion 511.

The rotation transmission member 91 is provided to transmit the rotation transmitted from the socket 5 to a drive sprocket not shown. The rotation transmitting member 91 is rotatably supported in the support hole 150 of the transmission-side stationary member 15.

A spline 91s is provided on the inner periphery of the rotation transmission member 91. The spline 91s is provided on the inner periphery of the position of the tip 910 on the side away from the disc portion 52 (left side in the drawing).

The spline 510s on the sleeve 5 side is spline-fitted to the spline 91s of the rotation transmitting member 91 from the rotation axis X direction, and the rotation transmitting member 91 and the sleeve 5 are coupled to each other so as to be rotatable.

In this state, the gap between the outer periphery of the connection portion 511 of the sleeve 5 and the inner periphery of the support hole 150 of the fixed-side member 15 is sealed by the lip seal S4.

Hereinafter, an assembly process of the torque converter 2 and the input shaft 10 will be described with reference to fig. 3 to 6.

Fig. 3 to 6 are views for explaining the assembly of the input shaft 10 and the torque converter 2.

Fig. 3 (a) is a diagram for explaining a state before the torque converter 2 is assembled to the input shaft 10 on the transmission mechanism side. Fig. 3 (b) is a diagram showing a state where the first engagement starting point b1 on the torque converter 2 side is engaged with the first engagement starting point a1 on the input shaft 10 side. Fig. 3 (c) is an enlarged view of the region a in fig. (b), and is an enlarged view showing the vicinity of the first engagement starting point b1 on the torque converter 2 side and the first engagement starting point a1 on the input shaft 10 side.

Fig. 4 is a diagram showing a state where the engagement starting point b2 of the boss 125 of the support member 12 is engaged with the engagement starting point a2 of the small diameter portion 101 of the input shaft 10.

In this figure, the states of engagement start points b3, b4, b5, and b6 and clearances CL3, CL4, CL5, and CL6 at the time when engagement start point b2 engages with engagement start point a2 are shown enlarged, respectively, and at engagement start points a3, a4, a5, and a6, respectively.

When the torque converter 2 is assembled to the input shaft 10 on the transmission mechanism portion side, the torque converter 2 is provided in a state of being partially fitted in advance.

The torque converter 2 in a partially fitted state is assembled to the input shaft 10 from the direction of the rotation axis X of the input shaft 10.

On the side of the torque converter 2 opposite to the transmission mechanism portion (the right side of fig. 3 (a)), the cylindrical portion 51 of the sleeve 5 protrudes.

On the side of the speed change mechanism portion opposite to the torque converter 2, the input shaft 10 and the stator shaft 11 protrude toward the torque converter 2. The rotation transmission member 91 to which the sleeve 5 is coupled is rotatably supported on the inner periphery of the support hole 150 in the fixed-side member 15 of the transmission.

In the input shaft 10, the small diameter portion 101, the large diameter portion 102, and the end portions of the splines 104s on the torque converter 2 side (left side in the drawing) form engagement starting points a2, a3, and a1 with the torque converter 2 side.

The stator shaft 11 has a distal end 111 and an end of the spline 112s on the torque converter 2 side (left side in the drawing) that serve as engagement starting points a6 and a4 with respect to the torque converter 2 side.

In the rotation transmission member 91, the end of the spline 91s on the torque converter 2 side (left side in the drawing) serves as an engagement starting point a5 with the torque converter 2 side.

In the torque converter 2, the end portion of the boss 125 on the input shaft 10 side (right side in the drawing) and the end portion of the disk portion 451 of the spring holder 45 on the input shaft 10 side (right side in the drawing) become engagement starting points b2 and b3 which engage with the engagement starting points a2 and a3 of the input shaft 10.

An end portion of the spline 61s of the turbine hub 60 on the input shaft 10 side (right side in the drawing) becomes an engagement starting point b1 which is engaged with the engagement starting point a1 of the input shaft 10.

The end of the annular wall portion 63 of the turbine hub 60 on the input shaft 10 side (right side in the drawing) serves as an engagement start point b6 that engages with the engagement start point a6 of the stator shaft 11.

An end portion of the spline 27s of the inner race 271 on the input shaft 10 side (right side in the drawing) becomes an engagement starting point b4 to be engaged with the engagement starting point a4 of the stator shaft 11.

Further, an end portion of the spline 510s of the sleeve 5 on the input shaft 10 side (right side in the drawing) becomes an engagement starting point b5 which is engaged with the engagement starting point a5 of the rotation transmitting member 91.

When the torque converter 2 is assembled to the input shaft 10 on the transmission mechanism side, first, the center line of the torque converter 2 (the support member 12) is disposed on the same axis as the rotation axis X of the input shaft 10 (see fig. 3 (a)).

In this state, the turbine hub 60, the inner ring 271, and the sleeve 5 are also arranged on the same axis as the rotation axis X.

In a state where the torque converter 2 and the input shaft 10 are arranged on the same shaft, the torque converter 2 is moved in an assembling direction (right direction in the drawing) of the input shaft 10 of the transmission mechanism portion. Thus, first, the distal end 51a of the sleeve 5 is inserted between the stator shaft 11 and the rotation transmitting member 91 (see fig. 3 (b)).

Next, the engagement start point b1 of the spline 61s of the turbine hub 60 is engaged with the engagement start point a1 of the spline 104s of the input shaft 10 (see fig. 3 (b) and (c)).

Here, the small diameter portion 101 side of the input shaft 10 is set to satisfy the following conditions (a) to (C).

(A) The distance L1 from the engagement start point a2 of the tip end 10a of the input shaft 10 to the engagement start point a1 of the spline 104s is shorter than the distance L2 from the engagement start point b2 of the boss 125 to the engagement start point b1 of the spline 61s of the turbine hub 60 in the torque converter 2 (L1 < L2: see fig. 3).

(B) At the time when the engagement start point a1 of the spline 104s is engaged with the engagement start point b1 of the spline 61s, a distance L3 from the engagement start point a2 to an engagement start point a3 at the boundary between the enlarged diameter portion 103 and the large diameter portion 102 is set so that the small diameter portion 101 of the input shaft 10 is located on the inner diameter side of the large diameter hole portion 132 of the support member 12.

(C) The distance L3 (the substantial axial length of the small diameter portion 101 in the rotation axis X direction) from the engagement start point a2 to the engagement start point a3 is set to be longer than the distance Lx1 (see fig. 2) from the engagement start point b2 of the boss 125 (the insertion inlet 125a of the transmission input shaft) to the seal S1.

Therefore, at the time when the engagement start point a1 on the input shaft 10 side is engaged with the engagement start point b1 on the torque converter 2 side, the small diameter portion 101 of the input shaft 10 is in a state of being loosely fitted in the support hole 13 (large diameter hole portion 132) of the support member 12.

Further, engagement starting point b2 on the support member 12 side and engagement starting point a2 on the input shaft 10 side have a clearance CL2 and face each other in the rotation axis X direction.

The seal ring S1 does not contact the input shaft 10.

When the torque converter 2 is further moved in the rotation axis X direction from the state shown in fig. 3 (b), the engagement starting point b2 of the boss 125 of the support member 12 engages with the engagement starting point a2 of the small diameter portion 101 of the input shaft 10 (see fig. 4).

At this time, during the period from the engagement between engagement start point a1 and engagement start point b1 to the engagement between engagement start point a2 and engagement start point b2, the movement of torque converter 2 in the direction of rotation axis X is guided by splines 61s and 104s that are fitted to each other.

Therefore, the torque converter 2 cannot be assembled in a state of being greatly inclined with respect to the rotation axis X.

Further, the small diameter portion 101 side of the input shaft 10 is set to satisfy the following conditions (D) to (H).

(D) A distance L3 from the engagement start point a2 of the input shaft 10 to the engagement start point a3 located at the boundary between the large diameter portion 102 and the enlarged diameter portion 103 is longer than a distance L4 from the engagement start point b2 of the boss 125 in the torque converter 2 to the engagement start point b3 of the disk portion 451 of the spring holder 45 (L4< L3).

At the time when the engagement start point a2 engages with the engagement start point b2, the engagement start point b3 on the spring holder 45 side and the engagement start point a3 on the input shaft 10 side face each other in the rotation axis X direction so as to maintain the clearance CL 3.

(E) The distance L5 from the engagement start point a2 of the input shaft 10 to the engagement start point a4 of the stator shaft 11 is longer than the distance L6 from the engagement start point b2 of the sleeve 125 to the engagement start point b4 of the inner race 271 in the torque converter 2 (L6 < L5).

At the point when the engagement start point a2 engages with the engagement start point b2, the engagement start point a4 of the stator shaft 11 and the engagement start point b4 of the inner race 271 face each other in the rotation axis X direction so as to maintain the clearance CL 4.

(F) A distance L7 from the engagement start point a2 of the input shaft 10 to the engagement start point a5 of the rotation transmitting member 91 is longer than a distance L8 from the engagement start point b2 of the boss 125 of the torque converter 2 to the engagement start point b5 of the sleeve 5 (L8 < L7).

At the point when the engagement start point a2 engages with the engagement start point b2, the engagement start point a5 of the rotation transmission member 91 and the engagement start point b5 of the sleeve 5 face each other in the rotation axis X direction so as to maintain the clearance CL 5.

(G) The distance L9 from the engagement start point a2 of the input shaft 10 to the engagement start point a6 of the stator shaft 11 is longer than the distance L10 from the engagement start point b2 of the sleeve 125 of the torque converter 2 to the engagement start point b6 of the annular wall portion 63 (L10 < L9).

At the point when the engagement start point a2 engages with the engagement start point b2, the engagement start point a6 of the stator shaft 11 and the engagement start point b6 of the inner race 271 face each other in the rotation axis X direction so as to maintain the clearance CL 6.

(H) The magnitude relationship of the respective clearances (CL3, CL4, CL5, and CL6) at the time of engagement between the engagement starting point a2 and the engagement starting point b2 is CL3 < CL 4< CL5 < CL 6.

Therefore, when the torque converter 2 is further assembled to the input shaft 10 of the transmission mechanism section from the state of fig. 4, the engagement start points are engaged in the order of the engagement start points a3, b3, engagement start points a4, b4, engagement start points a5, b5, and engagement start points a6, b 6.

Fig. 5 (a) is a diagram showing a state where the engagement start point b3 on the spring holder 45 side is engaged with the engagement start point a3 on the input shaft 10 side.

Fig. 5 (b) is a diagram showing a state at the time when the engagement start point a5 of the rotation transmission member 91 engages with the engagement start point b5 of the sleeve 5.

Fig. 6 (a) is a diagram showing a state in which the engagement start point a6 of the stator shaft 11 is engaged with the engagement start point b6 of the annular wall portion 63 of the turbine hub 60.

Fig. 6 (b) is a diagram showing a state at the time when the torque converter 2 is completely assembled to the input shaft 10 of the transmission mechanism portion.

When torque converter 2 is further assembled to input shaft 10 of the transmission mechanism from the state of fig. 4, since clearance CL3 between engagement start point a3 and engagement start point b3 is narrower than other clearances CL4, CL5, and CL6, engagement start point a3 and engagement start point b3 engage first than other engagement start points a4, a5, a6, engagement start points b4, b5, and b 6.

When engagement starting point a3 is engaged with engagement starting point b3, one side (leading end 10a side) and the other side (spline 104s side) of engagement starting point a3 in the rotation axis X direction of input shaft 10 are supported by sleeve 125 and turbine hub 60, respectively.

Therefore, the torque converter 2 is continuously assembled to the input shaft 10 in a state where the center lines thereof are aligned.

Further, the enlarged diameter portion 103 of the input shaft 10 is inclined in a direction in which the outer diameter increases as it goes toward the spline 104s side (right side in the drawing), and therefore, the engagement start point b3 on the torque converter 2 side and the engagement start point a3 on the input shaft 10 side can be smoothly engaged with each other.

Then, at the time of engagement between engagement start point a3 and engagement start point b3, engagement start points a4 to a6 and engagement start points b4 to b6 have the following relationships.

The engagement starting point a4 of the stator shaft 11 and the engagement starting point b4 of the inner race 271 face each other in the rotation axis X direction so as to maintain the clearance CL 4'.

The engagement starting point a5 of the rotation transmitting member 91 and the engagement starting point b5 of the sleeve 5 are opposed to each other in the rotation axis X direction so as to maintain the clearance CL 5'.

The engagement starting point a6 of the stator shaft 11 and the engagement starting point b6 of the annular wall portion 63 of the turbine hub 60 face each other in the rotation axis X direction so as to maintain the clearance CL 6'.

The magnitude relationship of the gaps (CL4 ', CL 5', and CL6 ') at the time when the engagement start point a2 and the engagement start point b2 are engaged is CL 4' < CL5 '< CL 6'.

When the torque converter 2 is further assembled to the input shaft 10 of the transmission mechanism from the state shown in fig. 5 (a), the engagement start point a4 engages with the engagement start point b4, and then the engagement start point a5 engages with the engagement start point b5 (see fig. 5 (b)).

In this state, the engagement starting point a6 of the stator shaft 11 and the engagement starting point b6 of the inner race 271 are opposed to each other in the rotation axis X direction so as to maintain the clearance CL 6'.

In the process from the state of fig. 5 (a) to the state of fig. 5 (b), the main lip S4a of the lip seal S4 provided in the support hole 150 of the fixed-side member 15 is pressed against the outer periphery 511a of the connection portion 511 of the sleeve 5.

Thereby, the gap between the inner periphery of the support hole 150 and the outer periphery of the connecting portion 511 of the sleeve 5 is sealed by the lip seal S4.

Further, the seal ring S1 provided on the inner periphery of the large diameter support portion 122 of the support member 12 reaches the engagement starting point a3 while sliding on the outer periphery 103a of the enlarged diameter portion 103 of the input shaft 10.

Here, when the seal ring S1 slides on the outer periphery 103a of the enlarged diameter portion 103, the inner periphery of the disc portion 451 having the predetermined width Wa in the rotation axis X direction slides on the outer periphery of the large diameter portion 102 of the input shaft 10.

Therefore, the seal ring S1 slides on the outer periphery 103a of the enlarged diameter portion 103 in a state where the seal ring S1 on the support member 12 side and the large diameter portion 102 on the input shaft 10 side are concentrically arranged on the common rotation axis X.

When the seal ring S1 slides on the outer periphery 103a of the enlarged diameter portion 103 in a state where the seal ring S1 and the input shaft 10 are not concentrically arranged, frictional resistance acting between the seal ring S1 and the outer periphery 103a may be different in the circumferential direction around the rotation axis X.

In this case, the seal ring S1 may fall off from the groove 123 while the seal ring S1 slides on the outer periphery 103 a. Since the seal ring S1 and the input shaft 10 are concentrically arranged, the frictional resistance acting between the seal ring S1 and the outer periphery 103a does not greatly vary in the circumferential direction around the rotation axis X, and therefore the seal ring S1 is less likely to fall off the recessed groove 123. Further, the seal ring S1 can be prevented from being broken even while the seal ring S1 slides on the outer periphery 103 a.

Further, when the seal ring S1 provided on the inner periphery of the large-diameter support portion 122 of the support member 12 reaches the engagement start point a3, the tip end 10a of the input shaft 10 is positioned on the inner diameter side of the sleeve 125.

This is because the distance L3 (the substantial axial length of the small diameter portion 101 in the direction of the rotation axis X) from the engagement start point a2 to the engagement start point a3 is set to be shorter than the distance Lx2 from the insertion outlet 125b of the boss 125 to the seal ring S1.

When the torque converter 2 is further assembled to the input shaft 10 of the transmission mechanism from the state shown in fig. 5 (b), the engagement start point a6 is engaged with the engagement start point b6 (see fig. 6 (a)).

At this time, the tip 910 of the rotation transmission member 91 engages with the outer periphery of the connection portion 511 of the sleeve 5. Thereby, the sleeve 5 side of the torque converter 2 is disposed concentrically with the input shaft 10 on the rotation axis X.

Thereby, the torque converter 2 and the input shaft 10 are concentrically arranged on the distal end 10a side and the proximal end side (the rotation transmission member 91 side) of the input shaft 10.

Therefore, if the torque converter 2 is further assembled to the input shaft 10 of the transmission mechanism portion from the state of fig. 6 (a), the member on the torque converter 2 side and the member on the transmission mechanism portion side are relatively displaced in the direction of the rotation axis X while being concentrically arranged with each other.

Thereby, the annular wall portion 63 of the turbine hub 60 and the tip end portion 111 of the stator shaft 11 are relatively displaced in the direction of the rotation axis X in a state of being arranged parallel to each other. Therefore, the engagement starting point b6 of the moving annular wall portion 63 is caught by the seal ring S3 protruding from the outer peripheral surface of the distal end portion 111, and the seal ring S3 can be appropriately prevented from falling off from the concave groove 111 b.

The automatic transmission 1 (transmission) of the present embodiment has the following configuration.

(1) The automatic transmission 1 includes:

a torque converter 2 having a support member 12 (hollow shaft);

an input shaft 10 (transmission input shaft) provided on the inner periphery of the support member 12;

a seal ring S1 (seal member) sandwiched between the support member 12 and the input shaft 10;

and a sleeve 125 interposed between the support member 12 and the input shaft 10 and disposed closer to the distal end 10a of the input shaft 10 than the seal ring S1.

The input shaft 10 has a large diameter portion 102 that contacts the seal ring S1, and a small diameter portion 101 that is located on the tip 10a side of the large diameter portion 102 and has a smaller diameter than the large diameter portion 102.

The inner diameter r3 of the seal ring S1 is larger than the outer diameter r1 of the bushing 125.

The axial length (distance L3) of the small diameter portion 101 is set to be longer than a distance Lx1 from an engagement start point b2 of the boss 125 (an insertion inlet of the transmission input shaft) to the seal S1.

When the torque converter 2 is assembled to the input shaft 10, an output shaft (shaft extension) is performed in which the center of the torque converter 2 and the center of the input shaft 10 are aligned.

With the above configuration, since the diameter of the boss 125, the diameter of the seal ring S1, and the length of the small diameter portion 101 are set, and the seal ring S1 comes into contact with the large diameter portion 102 after the completion of the removal of the shaft, the possibility of damage to the seal ring S1 can be reduced when the seal ring S1 comes into contact with the large diameter portion 102 after the removal of the shaft.

Here, a case where the large diameter portion 102 and the seal ring S1 are in contact with each other when the clearance CL3 disappears is exemplified (see fig. 4 (b)).

However, the contact between the large diameter portion 102 and the seal ring S1 is not limited to this. The large diameter portion 102 may be in contact with the seal ring S1 after the shaft is removed, and the large diameter portion 102 may be in contact with the seal ring S1 at the time when the clearance CL4 disappears, for example.

The automatic transmission 1 of the present embodiment has the following configuration.

(2) The length (axial length) L3 of the small diameter portion 101 in the direction of the rotation axis X is set to be shorter than the distance Lx2 from the insertion outlet 125b of the boss 125 to the seal ring S1.

In order to achieve downsizing of the automatic transmission 1, it is preferable to suppress as much as possible an increase in length (an increase in shaft length) of the input shaft 10 in the direction of the rotation axis X.

Therefore, the length L3 of the small diameter portion 101 is set to be shorter than the distance Lx2 from the insertion outlet 125b of the boss 125 to the seal ring S1, and the length L3 at which the seal ring S1 contacts the large diameter portion 102 is set on the way the tip 10a of the small diameter portion 101 passes through the boss 125, so that an increase in the axial length can be suppressed.

For example, the axial length (distance L3) of the small diameter portion 101 is preferably set to a length at which the seal ring S1 and the large diameter portion 102 come into contact when the tip 10a of the small diameter portion 101 is positioned on the insertion outlet 125b side (on the back side of the center line C between the insertion inlet 125a and the insertion outlet 125 b).

The automatic transmission 1 of the present embodiment has the following configuration.

(3) The small diameter portion 101 has an oil hole 101a for supplying working oil to the lock mechanism 4 (lock clutch) of the torque converter 2 between the boss 125 and the seal ring S1.

With this configuration, the sealing performance is ensured by the sleeve 125 and the seal ring S1.

The present invention may also be specified as a method of manufacturing the automatic transmission 1.

That is to say that the first and second electrodes,

(4) the automatic transmission 1 manufactured by the manufacturing method of the automatic transmission includes: a torque converter 2 having a support member 12 of the input shaft 10, a seal ring S1, and a sleeve 125.

The input shaft 10 is provided on the inner periphery of the support member 12, and has a small diameter portion 101 and a large diameter portion 102 having an outer diameter R2 larger than the outer diameter R1 of the small diameter portion 101.

The seal ring S1 is sandwiched between the support member 12 and the input shaft 10.

The sleeve 125 is interposed between the support member 12 and the input shaft 10, is disposed closer to the front end 10a of the input shaft 10 than the seal ring S1, and has an outer diameter r1 smaller than the inner diameter r3 of the seal ring S1.

In the manufacturing method of the automatic transmission 1, when the torque converter 2 is assembled to the input shaft 10, the torque converter 2 is pushed in (inserted) in the assembling direction, and the small-diameter portion 101 is pulled out without the seal ring S1 contacting the large-diameter portion 102.

After the shaft is removed, the torque converter 2 is further pushed in the assembling direction, and the large diameter portion 102 is brought into contact with the seal ring S1.

With this configuration, since the diameter of the boss 125, the diameter of the seal ring S1, and the length of the small diameter portion 101 are set, and the seal ring S1 comes into contact with the large diameter portion 102 after the completion of the removal of the shaft, the possibility of damage to the seal ring S1 can be reduced when the seal ring S1 comes into contact with the large diameter portion 102 after the removal of the shaft.

(5) A length L1 from an engagement starting point a2 (one end) of the small diameter portion 101 to an engagement starting point a1 of the spline portion 104 of the large diameter portion 102 in the direction of the rotation axis X is shorter than a length L2 from an engagement starting point b2 of the boss 125 to an engagement starting point b3 of the spline 61s of the turbine hub 60.

With this configuration, the large diameter portion 102 is spline-engaged with the turbine hub 60 before the small diameter portion 101 comes into contact with the boss 125. In this case, the insertion of the input shaft 10 into the torque converter 2 is guided in the direction of the rotation axis X by the spline engagement of the large diameter portion 102 and the turbine hub 60, and therefore, the shaft can be easily removed.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made within the scope of the technical idea.