阅读说明：本技术 自动变速器 (Automatic transmission ) 是由 桥本晃 三浦康雄 田中雄幸 中野智也 山田和弘 榎洋行 于 2020-09-15 设计创作，主要内容包括：本发明通过铆合部使不同材料的构件在轴方向上接合,形成构成自动变速器的离合器或制动器的一部分的旋转构件,抑制轴方向上的大型化。自动变速器(1)包括第1旋转构件(30)和与其在轴方向Z上相邻的第2旋转构件(40)。第1旋转构件(30)包括第1外侧旋转构件(31)和第1内侧旋转构件(36)。第1外侧旋转构件(31)具有第1外侧圆筒部(32)和第1外侧延设部(33)。第1内侧旋转构件(36)由不同于第1外侧旋转构件(31)的材料形成,并具有第1内侧圆筒部(38)和第1内侧延设部(37)。第1旋转构件(30)通过第1外侧延设部(33)和第1内侧延设部(37)在轴方向Z上通过铆合部(51)接合而成的第1延设部(39)而连结。铆合部(51)的突出部(51a)的至少一部分位于形成于第2旋转构件(40)的凹部(45)内。(The present invention provides a rotary member which is formed by joining members of different materials in an axial direction through a riveting portion and forms a part of a clutch or a brake of an automatic transmission, and the large-scale in the axial direction is restrained. The automatic transmission (1) includes a 1 st rotation member (30) and a 2 nd rotation member (40) adjacent thereto in an axial direction Z. The 1 st rotating member (30) includes a 1 st outer rotating member (31) and a 1 st inner rotating member (36). The 1 st outer rotary member (31) has a 1 st outer cylindrical portion (32) and a 1 st outer extension portion (33). The 1 st inner rotary member (36) is formed of a material different from that of the 1 st outer rotary member (31), and has a 1 st inner cylindrical portion (38) and a 1 st inner extension (37). The 1 st rotating member (30) is connected by a 1 st extending portion (39) formed by joining a 1 st outer extending portion (33) and a 1 st inner extending portion (37) in the axial direction Z by a caulking portion (51). At least a part of the protrusion (51 a) of the caulking part (51) is positioned in a recess (45) formed in the 2 nd rotating member (40).)

1. An automatic transmission comprising: a 1 st rotating member that transmits power between paired members including at least 1 rotating element, a 2 nd rotating member that transmits power between other paired members including at least 1 rotating element, characterized in that:

the 1 st rotation member includes: an outer rotating member, an inner rotating member located on an inner diameter side thereof;

the outer rotating member includes: a 1 st outer power transmission part for transmitting power between the cylindrical peripheral part and one of the pair of members, and an outer extension part extending from the 1 st outer power transmission part to the inner diameter side;

the inside rotation member includes: a 1 st inner power transmission portion formed of a material different from the outer rotary member and transmitting power between the other member of the pair of members, an inner extension portion extending from the 1 st inner power transmission portion to an outer diameter side;

the 1 st rotating member is connected by a 1 st extending portion, and the 1 st extending portion is formed by joining the outer extending portion and the inner extending portion in the axial direction of the automatic transmission by a mechanically joined riveting portion;

the 2 nd rotation member includes:

a 2 nd outer power transmission part for transmitting power between the cylindrical peripheral part and one of the other paired members;

a 2 nd inner power transmission unit located on an inner diameter side of the 2 nd outer power transmission unit and transmitting power between the other member of the other pair of members;

a 2 nd extending portion extending from the 2 nd outer power transmission portion toward an inner diameter side and connected to the 2 nd inner power transmission portion;

wherein the 1 st extending part and the 2 nd extending part are adjacent to each other in the axial direction;

the riveting part comprises a protruding part which is concavely arranged from the 1 st extending part to the 2 nd extending part and protrudes out;

the 2 nd extending part comprises a concave part concavely arranged on the opposite side of the 1 st extending part;

at least a portion of the protrusion is located within the recess.

2. The automatic transmission of claim 1, wherein:

the outer rotating member has a lower specific gravity than the inner rotating member.

3. The automatic transmission according to claim 1 or 2, characterized in that:

the outer rotary member is an aluminum material;

the inner rotary member is an iron material.

4. The automatic transmission according to any one of claims 1 to 3, characterized in that:

the caulking portion is recessed from a member having a high shear strength to a member having a low shear strength, out of the outer rotary member and the inner rotary member.

5. The automatic transmission according to any one of claims 1 to 3, characterized in that:

the caulking portion is recessed from the member having a high thermal expansion coefficient toward the other member in the outer extending portion and the inner extending portion.

6. The automatic transmission according to any one of claims 1 to 5, characterized in that:

at least a part of the 1 st extension portion other than the caulking portion overlaps the recess portion in the axial direction.

7. The automatic transmission according to any one of claims 1 to 6, characterized in that:

a power transmission member is disposed radially inward of the 2 nd outer power transmission portion;

at least a part of the recess portion overlaps with the power transmission member in the axial direction.

8. The automatic transmission of claim 7, wherein:

the power transmitting member is a carrier of a planetary gear set.

9. The automatic transmission of claim 8, wherein:

the planetary gear set has a constituent member of the same material as the 2 nd extension portion;

the 2 nd extending portion is joined to the constituent member by welding.

10. The automatic transmission of claim 9, wherein:

the constituent member is a ring gear.

11. The automatic transmission according to any one of claims 8 to 10, characterized in that:

the 1 st extension and the 2 nd extension are located between the planetary gear set and the brake device.

Technical Field

The present invention relates to an automatic transmission.

Background

Generally, an automatic transmission mounted on a vehicle includes a speed change gear (speed changing gear) mechanism and a friction fastening device that realizes a plurality of speed change stages by switching a power transmission path of the speed change gear mechanism. The friction fastening device includes a clutch that interrupts power between the paired rotating elements and a brake that fixes the rotation of 1 rotating element.

The clutch is a multiple disc clutch (multiple disc clutch) having a plurality of friction plates, and has the following members as rotating members: a drum member engaging a part of the friction plate with a tooth surface on an outer circumference thereof movably in an axial direction and coupled with a certain rotational element of the transmission; and a hub member that engages the other friction plate with a tooth surface so that the other friction plate can move in the axial direction on the inner periphery thereof and is coupled to the other fixed rotating element of the transmission. The brake has the same structure as the clutch, but differs in that one of the drum member and the hub member is fixed to the transmission cover.

In recent years, reduction in weight of an automatic transmission has been considered to improve fuel efficiency performance of a vehicle, and it has been considered to reduce weight by aluminizing the rotary member. However, since the power transmission portion for transmitting power to and from the rotary element is often provided on the side of the rotational center axis of the transmission in the rotary member, the tangential load is larger than the outer peripheral portion of the friction plate with which the tooth surface is engaged, and the strength of the aluminum material may be insufficient.

In this regard, it is conceivable to form the power transmission portion with an iron material and form the other portion with an aluminum material and join them. However, it is difficult to join an iron material and an aluminum material, which are different materials, by welding, and for example, it is conceivable to join them by a clinch portion of mechanical bonding (mechanical clamp) as disclosed in patent document 1.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2019-104018.

Disclosure of Invention

Technical problem to be solved by the invention

A projection portion is formed at the mechanically joined caulking portion so as to be recessed from one side member to the other side member and to project therefrom. In this way, the size of the joint portion formed by joining the one member and the other member is increased at the portion where the protruding portion is formed. In particular, when the caulking portion is formed to be recessed in the axial direction of the automatic transmission, the automatic transmission is increased in size in the axial direction.

The present invention has been made in an effort to provide an automatic transmission that can form a rotary member constituting a part of a clutch or a brake by joining members made of different materials in an axial direction by a mechanically joined caulking portion, and can suppress an increase in size in the axial direction.

Means for solving the problems

In order to solve the above problems, the present invention has the following features.

The present invention relates to an automatic transmission and,

the automatic transmission includes: a 1 st rotating member that transmits power between paired members including at least 1 rotating element, a 2 nd rotating member that transmits power between other paired members including at least 1 rotating element, characterized in that:

the 1 st rotation member includes: an outer rotating member, an inner rotating member located on an inner diameter side thereof;

the outer rotating member includes: a 1 st outer power transmission portion that transmits power between the cylindrical peripheral portion and one of the pair of members, and an outer extension portion that extends radially inward from the 1 st outer power transmission portion;

the inside rotation member includes: a 1 st inner power transmission portion formed of a material different from the outer rotary member and transmitting power between the other member of the pair of members, an inner extension portion extending from the 1 st inner power transmission portion to an outer diameter side;

the 1 st rotating member is connected by a 1 st extending portion, and the 1 st extending portion is formed by joining the outer extending portion and the inner extending portion in the axial direction of the automatic transmission by a mechanically joined riveting portion;

the 2 nd rotation member includes:

a 2 nd outer power transmission part for transmitting power between the cylindrical peripheral part and one of the other paired members;

a 2 nd inner power transmission unit located on an inner diameter side of the 2 nd outer power transmission unit and transmitting power between the other member of the other pair of members;

a 2 nd extending portion extending from the 2 nd outer power transmission portion toward an inner diameter side and connected to the 2 nd inner power transmission portion;

wherein the 1 st extending part and the 2 nd extending part are adjacent to each other in the axial direction;

the riveting part comprises a protruding part which is concavely arranged from the 1 st extending part to the 2 nd extending part and protrudes out;

the 2 nd extending part comprises a concave part concavely arranged on the opposite side of the 1 st extending part;

at least a portion of the protrusion is located within the recess.

According to the present invention, the outer rotary member and the inner rotary member made of different materials can be appropriately brought into contact with each other by the caulking portion to constitute the 1 st rotary member. The 1 st rotating member is made of a different material, and can be set to a material suitable for each portion, so that it is easy to secure strength and reduce weight. Further, the outer rotary member and the inner rotary member can be joined without using any additional material, for example, without forming the tooth surface teeth for tooth surface joining or the like, and therefore, the cost can be reduced.

In addition, the 1 st extension portion forms a protruding portion at a caulking portion joining the outer extension portion and the inner extension portion, and at least a part of the protruding portion is located in a recess formed in the 2 nd extension portion. Thus, the 1 st extending portion is disposed close to the 2 nd extending portion while preventing the protruding portion of the caulking portion from interfering with the 2 nd extending portion. This makes it easy to dispose the 1 st rotating member close to the 2 nd rotating member in the axial direction, and to make the automatic transmission compact in the axial direction.

Preferably, the outer rotating member has a lower specific gravity than the inner rotating member.

According to the present technical solution, it is easy to reduce inertia (inertia) of the 1 st rotating member. This makes it possible to improve the fuel efficiency performance of the vehicle, for example, when the automatic transmission is mounted on the vehicle and used for shifting the output from the internal combustion engine.

Preferably, the outer rotating member is an aluminum material;

the inner rotary member is an iron material.

According to the technical scheme, the outer rotating member is positioned on the outer diameter side, so that the anti-torsion moment is easy to improve, and even the aluminum material with relatively low material strength can ensure the anti-torsion moment. The inner rotary member is located on the inner diameter side, and it is difficult to increase the torsional moment, and the torsional moment is secured by being made of iron having a relatively high material strength. Therefore, the anti-twisting moment of the 1 st rotating member can be secured and the inertia can be reduced.

Preferably, the caulking portion is recessed from a member having a high shear strength to a member having a low shear strength, of the outer rotary member and the inner rotary member.

According to the present invention, a member having a relatively high shear strength is sunk into a recess formed in one member to form a clinched portion. Here, the torsional moment to the 1 st rotation member acts on the depressed portion as a force in the shearing direction. Therefore, by forming the portion recessed into the clinch portion with a member having a relatively high shear strength, the strength of the clinch portion in the shear direction can be easily increased, and the twisting torque of the clinch portion can be easily increased.

Preferably, the caulking portion is recessed from the member having a high thermal expansion coefficient toward the other member in the outer extending portion and the inner extending portion.

According to the present invention, a member having a relatively high thermal expansion coefficient is sunk into a recess formed in one member to form a caulking portion. Therefore, at the time of temperature rise, the thermal expansion amount of the portion that falls into the concave portion can be made larger than the thermal expansion amount of the concave portion formed in one member, and therefore, the rattling or deviation of the caulking portion due to the difference in thermal expansion amount is easily suppressed.

Preferably, at least a part of the 1 st extension portion other than the caulking portion overlaps the recess portion in the axial direction.

According to the present invention, the 1 st extension portion can be disposed closer to the 2 nd extension portion. Therefore, it is easy to make the automatic transmission more compact in the axial direction.

Preferably, a power transmission member is disposed radially inward of the 2 nd outer power transmission portion;

at least a part of the recess portion overlaps with the power transmission member in the axial direction.

According to the present invention, the 2 nd extending portion can be provided with the recess, and the 2 nd rotating member can be disposed close to the power transmission member in the axial direction. This makes it easy to further compact the automatic transmission in the axial direction.

Preferably, the power transmission member is a carrier of a planetary gear set.

According to the present invention, when the power transmitting member is the carrier of the planetary gear set, the invention can be preferably implemented. That is, the 2 nd extending portion can be disposed close to the planetary gear set in the axial direction.

Preferably, the planetary gear set has a constituent member of the same material as the 2 nd extension;

the 2 nd extending portion is joined to the constituent member by welding.

According to the present invention, since the 2 nd extending portion and the constituent member of the planetary gear set are made of the same material, the joining can be easily performed without using another joining means such as tooth surface meshing.

Preferably, the constituent member is a ring gear (ring gear).

According to the present aspect, the present invention can be preferably implemented when the constituent member of the planetary gear set is a ring gear.

Preferably, the 1 st extension portion and the 2 nd extension portion are disposed between the planetary gear set and the brake device.

According to the present invention, the 1 st extension and the 2 nd extension are arranged close to the planetary gear set in the axial direction, so that the brake device is also easily arranged close to the planetary gear set in the axial direction. This makes it easy to further compact the automatic transmission in the axial direction.

Effects of the invention

According to the automatic transmission of the present invention, the members made of different materials are engaged in the axial direction by the mechanically engaged caulking portions, so that the rotary member constituting a part of the clutch or the brake can be formed, and the increase in size in the axial direction can be suppressed.

Drawings

Fig. 1 is a schematic structural view of an automatic transmission according to an embodiment of the present invention;

FIG. 2 is a fastening table of friction fastening elements of the automatic transmission;

FIG. 3 is a cross-sectional view of the 3 rd clutch and its surroundings;

FIG. 4 is a fragmentary view of the first rotating member shown at arrow A in FIG. 3;

fig. 5 is a diagram of a caulking portion according to a modification.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a skeleton diagram of an automatic transmission according to an embodiment of the present invention. The automatic transmission 1 includes an input shaft 3 connected to a drive source and disposed on a drive source side (left side in the drawing) and an output shaft 4 disposed on a reverse drive source side (right side in the drawing) in a transmission cover 2. The automatic transmission 1 is a longitudinal automatic transmission for a front engine, a rear-wheel drive vehicle, or the like in which the input shaft 3 and the output shaft 4 are disposed on the same axis O1. In the following description, the direction in which the axis O1 extends is referred to as an axial direction Z, the direction toward the drive source side in the axial direction Z is referred to as an axial direction Z1, and the direction toward the counter drive source side is referred to as an axial direction Z2.

On the axial centers of the input shaft 3 and the output shaft 4, 1 st, 2 nd, 3 rd, and 4 th planetary gear sets (hereinafter, simply referred to as "1 st, 2 nd, 3 rd, and 4 th gear sets") PG1, PG2, PG3, and PG4 are arranged toward the side of the axial direction Z2.

In the transmission cover 2, a 1 st clutch CL1, a 2 nd clutch CL2, and a 3 rd clutch CL3 are arranged in order toward the axial direction Z1 side on the axial direction Z1 side of the 1 st gear group PG 1. A 1 st brake BR1 is disposed on the axial direction Z1 side of the 3 rd clutch CL 3. A 2 nd brake BR2 is provided between the 3 rd gear set PG3 and the 2 nd gear set PG 2.

The 1 st, 2 nd, 3 rd and 4 th gear sets PG1, PG2, PG3 and PG4 are all of a single pinion type in which a pinion (pinion) supported by a carrier is directly engaged with a sun gear and a ring gear. The 1 st, 2 nd, 3 rd, and 4 th gear sets PG1, PG2, PG3, PG4 have sun gears S1, S2, S3, S4, ring gears R1, R2, R3, R4, carriers C1, C2, C3, and C4 as rotation elements, respectively.

The 1 st gear PG1 is a double sun gear type in which the sun gear S1 is divided into 2 in the axial direction. The sun gear S1 includes: a 1 st sun gear S1a disposed on the side of the axis direction Z1, and a 2 nd sun gear S1b disposed on the side of the axis direction Z2. The 1 st and 2 nd sun gears S1a, S1b have the same number of teeth and mesh with the same pinion gear supported by the carrier C1. Thus, the 1 st and 2 nd sun gears S1a, S1b always rotate in the same direction.

Generally, in the automatic transmission 1, the sun gear S1 of the 1 st gear set PG1, specifically, the 2 nd sun gear S1b and the sun gear S4 of the 4 th gear set PG4 are kept connected. Generally, the ring gear R1 of the 1 st gear set PG1 and the sun gear S2 of the 2 nd gear set PG2 remain linked. Generally, the carrier C2 of the 2 nd gear set PG2 and the carrier C4 of the 4 th gear set PG4 remain linked. Generally, the carrier C3 of the 3 rd gear set PG3 and the ring gear R4 of the 4 th gear set PG4 remain coupled.

Normally, the input shaft 3 is coupled to the carrier C1 of the 1 st gear set PG1 through the gap between the 1 st sun gear S1a and the 2 nd sun gear S1 b. Normally, the output shaft 4 is linked to the carrier C4 of the 4 th gear set PG 4.

The 1 st clutch CL1 is disposed between the input shaft 3 and the carrier C1 of the 1 st gear set PG1 and the sun gear S3 of the 3 rd gear set PG3, and is connected to and disconnected from each other. The 2 nd clutch CL2 is disposed between the ring gear R1 of the 1 st gear set PG1 and the sun gear S2 of the 2 nd gear set PG2 and the sun gear S3 of the 3 rd gear set PG3, and is connected to and disconnected from each other. The 3 rd clutch CL3 is disposed between the ring gear R2 of the 2 nd gear set PG2 and the sun gear S3 of the 3 rd gear set PG3, and is connected and disconnected.

The 1 st brake BR1 is disposed between the transmission cover 2 and the sun gear S1 of the 1 st gear set PG1, specifically, the 1 st sun gear S1a, and is engaged and disengaged. The 2 nd brake BR2 is disposed between the transmission cover 2 and the ring gear R3 of the 3 rd gear set PG3, and is connected and disconnected.

With the above configuration, as shown in fig. 2, the automatic transmission 1 forms 1 to 8D-range gears and a reverse gear of R-range gear by a combination of fastening states of the 1 st clutch CL1, the 2 nd clutch CL2, the 3 rd clutch CL3, the 1 st brake BR1, and the 2 nd brake BR 2.

Fig. 3 is a sectional view of the 3 rd clutch CL3 and the periphery of the 2 nd gear set PG2, and shows only one side (upper side in fig. 1) in the radial direction with the input shaft 3 (see fig. 1) as the center.

As shown in fig. 3, the 3 rd clutch CL3 includes: a clutch hub 10, a clutch drum 20 disposed concentrically on the outer peripheral side thereof, a plurality of friction plates 6 disposed between the radial directions as described above, and a piston portion 7 for pressing the plurality of friction plates 6 in the axial direction Z1. Further, the 3 rd clutch CL3 includes: the 1 st rotation member 30 that couples the clutch hub 10 to the sun gear S3 (see fig. 1) of the 3 rd gear set PG3, and the 2 nd rotation member 40 that couples the clutch drum 20 to the ring gear R2 of the 2 nd gear set PG 2.

The 2 nd rotation member 40 is located on the inner diameter side of the 1 st rotation member 30, and is adjacent to a 1 st extending portion 39 and a 2 nd extending portion 49, which will be described later, in the Z-axis direction.

The clutch hub 10 includes: a cylindrical hub 1 st cylindrical portion 11 centered on the axis O1, a cylindrical hub 2 nd cylindrical portion 13 concentrically positioned on the outer peripheral side, and a hub vertical wall portion 15 radially connecting end portions of the hub 1 st cylindrical portion 11 and the hub 2 nd cylindrical portion 13 on the axial direction Z1 side.

A hub 1 st tooth surface portion 12 is formed on an outer peripheral portion of the hub 1 st cylindrical portion 11, and a part of friction plates 6a (hereinafter referred to as hub side friction plates) of the plurality of friction plates 6 is engaged with the hub 1 st tooth surface portion 12 so as to be movable in the axial direction Z. A hub 2 nd tooth surface portion 14 for transmitting power to the 1 st rotation member 30 is formed on the outer peripheral portion of the hub 2 nd cylindrical portion 13.

The clutch drum 20 has a drum cylindrical portion 21 located on the outer diameter side of the hub 1 st cylindrical portion 11, that is, on the inner diameter side of the hub 2 nd cylindrical portion 13. The drum cylindrical portion 21 is formed in a cylindrical shape centering on the axis O1. A tooth surface portion 22 is formed on the inner peripheral portion of the drum cylindrical portion 21, and the remaining friction plates 6b (hereinafter referred to as drum-side friction plates) of the plurality of friction plates 6 are engaged with the tooth surface portion 22 so as to be movable in the axial direction Z.

In the friction plate 6, hub side friction plates 6a and drum side friction plates 6b are alternately arranged in the axial direction Z. The piston portion 7 reciprocates in the axial direction Z by hydraulic pressure supplied to a cylinder not shown. When the piston portion 7 moves in the axial direction Z1, the plurality of friction plates 6 are sandwiched between the distal end pressing portion 7a of the piston portion 7 and the hub longitudinal wall portion 15, and the 3 rd clutch CL3 is in a fastened state. On the other hand, when the piston portion 7 moves in the axial direction Z2, the plurality of friction plates 6 are released from being fastened, and the 3 rd clutch CL3 is released.

The 1 st rotation member 30 includes a 1 st outer rotation member 31 on the outer diameter side and a 1 st inner rotation member 36 on the inner diameter side thereof, and is configured by mechanical engagement as described later. The 1 st outer rotation member 31 and the 1 st inner rotation member 36 are formed of different materials from each other. Specifically, the 1 st outer rotation member 31 is formed of a material having a relatively small specific gravity (such as an aluminum material or a magnesium material), and the 1 st inner rotation member 36 is formed of a material having a relatively large specific gravity (such as an iron material).

The 1 st outer rotating member 31 includes: a 1 st outer cylindrical portion 32 extending concentrically with the axis O1, and a 1 st outer extension 33 extending from an end portion of the 1 st outer cylindrical portion 32 on the axial direction Z2 side in a zigzag manner toward the inner radial side. Further, a 1 st outer tooth surface portion 34 is formed on an inner peripheral portion of an end portion of the 1 st outer cylindrical portion 32 on the side of the axial direction Z1, and the 1 st outer tooth surface portion 34 is engaged with the hub 2 nd tooth surface portion 14 of the clutch hub 10 to transmit power to the clutch hub 10. That is, the 1 st outer cylindrical portion 32 constitutes the 1 st outer power transmission portion according to the present invention.

The 1 st inner rotating member 36 includes: a 1 st inner extension 37 radially extending between the 2 nd brake BR2 and the 2 nd gear set PG2, and a 1 st inner cylindrical portion 38 having a cylindrical shape with the axis O1 as a center. The 1 st inner extension 37 is a plate-like member formed by stretching an iron material into an annular shape.

The 1 st inner cylindrical portion 38 includes a flange portion 38a formed by forging an iron material and extending in the radial direction at an end portion on the axial direction Z1 side, and a 1 st inner tooth surface portion (not shown) that is in tooth surface engagement with an inner peripheral portion (see fig. 1) of the sun gear S3 of the 3 rd gear group PG3 and transmits power to the sun gear S3 is formed on an outer peripheral portion on the axial direction Z2 side. That is, the 1 st inner cylindrical portion 38 constitutes the 1 st inner power transmission portion according to the present invention.

The 1 st inner extension 37 and the 1 st inner cylindrical portion 38 are welded to each other so as to be opposed to each other in the radial direction to form the 1 st inner rotary member 36. In the 1 st inner rotary member 36, the 1 st inner extension 37 having a simple shape is formed of an extension material, and the 1 st inner cylindrical portion 38 having a complicated shape is formed of a forged material, whereby the entire member can be formed of an iron material, and an increase in processing cost when the entire member is forged and formed can be suppressed.

As shown in the enlarged view of the portion B in fig. 3, the 1 st inner extension 37 abuts the 1 st outer extension 33 in the abutment region X1 from the side of the axial direction Z2. The 1 st outer rotation member 31 and the 1 st inner rotation member 36 are mechanically joined in the axial direction Z by the caulking portion 51 that is mechanically joined in the contact region X1. The 1 st outer extension 33 and the 1 st inner extension 37 are joined to each other to form a 1 st extension 39. The 1 st extension 39 is located between the 2 nd brake BR2 and the 2 nd gear set PG2 in the axial direction Z, and extends in the radial direction.

The caulking portion 51 is caulked while being recessed from the 1 st inner extension 37 side toward the 1 st outer extension 33 side, i.e., toward the axial direction Z1 side. The caulking portion 51 has a protrusion 51a protruding in the axial direction Z1 with respect to the portion of the 1 st outer extension 33 other than the caulking portion 51. In the caulking portion 51, the 1 st inner recess 37a of the 1 st inner extension 37 recessed in the axial direction Z1 side is recessed in the 1 st outer recess 33a of the 1 st outer extension 33 recessed in the axial direction Z1 side.

Fig. 4 is a single body front view of the 1 st rotating member 30 as viewed from arrow a of fig. 3. As shown in fig. 4, the contact region X1 is formed in an annular shape having a radial width dimension L1 around the axis O1, as indicated by a hatching indicated by a broken line. The caulking portions 51 are provided at substantially equal intervals at a plurality of positions on a virtual circle C passing through substantially the middle position of the radial width dimension L1 in the contact region X1.

The number of the caulking portions 51 is set in consideration of the joining strength of the caulking portion 51 at average 1 with respect to the torque moment required among 2 rotation elements. Specifically, the strength in the shearing direction (rotation direction) of the 1 st inner recess 37a recessed in the 1 st outer recess 33a is considered. In the present embodiment, since the 1 st inner recess 37a of the iron material is recessed into the caulking portion 51, the shear strength of the recessed portion is easily increased, and the joining strength of the caulking portion 51 is easily increased as compared with the case where the 1 st outer recess 33a of the aluminum material is recessed.

Next, the 2 nd rotation member 40 will be explained with reference to fig. 3. The 2 nd rotation member 40 has the same structure as the 1 st rotation member 30, and includes a 2 nd outer rotation member 41 of an aluminum material and a 2 nd inner rotation member 46 on an inner diameter side thereof and of an iron material.

The 2 nd outer rotating member 41 is integrally formed with the clutch drum 20, and transmits power to the plurality of drum-side friction plates 6b through the head gear surface portion 22. Therefore, the 2 nd outer rotating member 41 constitutes the 2 nd outer power transmission portion according to the present invention. The 2 nd outer rotating member 41 includes: a 2 nd outer cylindrical portion 42 connected to the drum cylindrical portion 21 and extending toward the axial direction Z2 side, and a 2 nd outer extension portion 43 extending from an end portion of the 2 nd outer cylindrical portion 42 on the axial direction Z2 side and meandering toward the inner radial side.

The 2 nd outer extension 43 is located on the axial direction Z1 side with respect to the 1 st extension 39, and specifically, overlaps the ring gear R2 of the 2 nd gear group PG2 in the axial direction Z. Further, the 2 nd outer extending portion 43 extends in the radial direction to the vicinity of the outer diameter portion of the ring gear R2.

The 2 nd inner rotation member 46 includes the 2 nd inner extension 47, which is an extension material, and the 2 nd inner cylindrical portion 48, which is a forging material, which are opposed in the radial direction and joined by welding as described above. The 2 nd inner extension 47 extends radially in the axial direction Z1 with respect to the 1 st extension 39.

The 2 nd inner cylindrical portion 48 is supported in the axial direction Z1 by the flange portion 38a of the 1 st inner cylindrical portion 38 via the bearing 61, and is rotatably supported by the inner peripheral portion of the 1 st inner cylindrical portion 38 via the bearing 62.

A concave portion 45 is formed in an annular shape around the axis O1 and recessed toward the axial direction Z1 side on the outer diameter side portion of the 2 nd inner extension 47. The recess 45 is located on the outer diameter side in the radial direction with respect to the carrier C2 of the 2 nd gear set PG2, and at least a portion thereof overlaps with a length Y1 in the axial direction Z. Further, the recess 45 overlaps at least a part of the protrusion 51a of the caulking portion 51 by a length Y2 in the axial direction Z. The recess 45 overlaps with at least a part of the 1 st outer extending portion 33 other than the caulking portion 51 by a length Y3 in the axial direction Z.

The 2 nd inner extension 47 abuts the 2 nd outer extension 43 at the outer diameter side portion of the recess 45 in the axial direction Z2 side at an abutment region X2. The 2 nd outer rotation member 41 and the 2 nd inner rotation member 46 are mechanically joined in the axial direction Z by the caulking portion 52 that is mechanically joined in the contact region X2.

The caulking portion 52 is caulked in a manner similar to the caulking portion 51, and is recessed from the 2 nd inner extending portion 47 side toward the 2 nd outer extending portion 43 side, i.e., toward the axial direction Z1 side. The caulking portion 52 has a protrusion 52a protruding in the axial direction Z1 with respect to the portion of the 2 nd outer extension 43 other than the caulking portion 52. In the caulking portion 52, the 2 nd inner recessed portion 47a recessed toward the axial direction Z1 side of the 2 nd inner extending portion 47 is recessed into the 2 nd outer recessed portion 43a recessed toward the axial direction Z1 side of the 2 nd outer extending portion 43.

The 2 nd outer extension 43 and the 2 nd inner extension 47 are joined to each other to form a 2 nd extension 49. The 2 nd extending portion 49 overlaps with the ring gear R2 by a length Y4 in the Z-axis direction. The caulking portions 52 are provided at substantially equal intervals at a plurality of positions on a virtual circle passing through substantially the center of the radial width dimension in the contact region X2, and are not shown.

The ring gear R2 is formed of an iron material of the same material as the 2 nd inner rotating member 46. The 2 nd inner extension 47 is joined by welding to the ring gear R2 from the axial direction Z2 side at an inner diameter side portion with respect to the abutment region X2 in the recess 45, and transmits power with respect to the ring gear R2. Therefore, the inner diameter side portion of the recess 45 in the 2 nd inner extension 47 constitutes the 2 nd inner power transmission unit according to the present invention.

The automatic transmission 1 according to the above embodiment exhibits the following technical effects.

(1) The 1 st outer rotation member 31 and the 1 st inner rotation member 36 made of different materials can be appropriately joined by the caulking portion 51 to constitute the 1 st rotation member 30. By constituting the 1 st rotating member 30 with different kinds of materials, it is possible to set materials suitable for respective portions, and therefore it is easy to secure strength and reduce weight. Further, for example, the 1 st outer rotary member 31 and the 1 st inner rotary member 36 can be joined without forming the tooth surface teeth for tooth surface joining or the like and without using an auxiliary material, and therefore, the cost can be reduced. The above-described operational effects are also exhibited by the 2 nd rotation member 40, and the effects of the 1 st rotation member 30 will be mainly described in detail below.

In addition, the 1 st extension 39 has a protrusion 51a formed in a caulking portion 51 joining the 1 st outer extension 33 and the 1 st inner extension 37, and at least a part of the protrusion 51a is located in the recess 45 formed in the 2 nd extension 49. This prevents the projecting portion 51a of the caulking portion 51 from interfering with the 2 nd extending portion 49, and the 1 st extending portion 39 is disposed close to the 2 nd extending portion 49. This makes it easy to dispose the 1 st rotating member 30 close to the 2 nd rotating member 40 in the axial direction, and to compact the automatic transmission 1 in the axial direction Z.

(2) The 1 st outer rotation member 31 is heavier than the 1 st inner rotation member 36, and thus it is easy to reduce the inertia of the 1 st rotation member 30. Thus, for example, when the automatic transmission 1 is mounted on a vehicle and used for shifting the output from the internal combustion engine, the fuel efficiency performance of the vehicle can be improved.

(3) The 1 st outer rotating member 31 is an aluminum material, and the 1 st inner rotating member 36 is an iron material. Thus, the 1 st outer rotary member 31 is positioned on the outer diameter side, and the anti-twisting torque can be easily increased, and can be secured even with an aluminum material having a relatively low material strength. On the other hand, the 1 st inner rotary member 36 is located on the inner diameter side, and it is difficult to increase the twisting torque, and the twisting torque is secured by being made of iron having a relatively high material strength. Therefore, the anti-twisting moment of the 1 st rotating member 30 can be secured and the inertia can be reduced.

(4) The caulking portion 51 is recessed from the 1 st inner rotary member 36, which is an iron material and has a relatively high shear strength, to the 1 st outer rotary member 31, which is an aluminum material and has a relatively low shear strength. The 1 st inner recess 37a having a relatively high shear strength is recessed into the 1 st outer recess 33a formed in the 1 st outer rotary member 31 to form the caulking portion 51. Here, the torsional moment to the 1 st rotation member 30 acts on the depressed portion as a force in the shearing direction. Therefore, by configuring the 1 st inner rotary member 36 having a relatively high shear strength as a portion that sinks into the rivet portion 51, the strength of the rivet portion 51 in the shear direction can be easily increased, and the twisting torque of the rivet portion 51 can be easily increased.

(5) Since the 1 st extension 39 overlaps the recess 45 in the axial direction Z except for at least a part of the caulking portion 51, the 1 st extension 39 can be disposed closer to the 2 nd extension 49. Therefore, it is easy to make the automatic transmission 1 more compact in the axial direction Z.

(6) The 2 nd gear set PG2 is disposed radially inward of the 2 nd rotary member 40, and at least a part of the recess 45 overlaps with the carrier C2 of the 2 nd gear set PG2 in the axial direction Z. The 2 nd extending portion 49 can be provided with the recess 45, and the 2 nd rotation member 40 can be disposed close to the 2 nd planetary gear set PG2 in the axial direction Z. This makes it easy to further compact the automatic transmission 1 in the axial direction Z.

(7) The 2 nd gear set PG2 includes a ring gear R2 formed of the same material as the 2 nd inner rotary member 46, i.e., an iron material, and the 2 nd inner extension 47 of the 2 nd inner rotary member 46 is joined to the ring gear R2 at the inner diameter side portion of the recess 45 by welding. Since the 2 nd inner extension 47 and the ring gear R2 are formed of the same material, i.e., iron material, they can be easily joined without using any other joining means such as tooth surface meshing.

(8) The 1 st extension 39 and the 2 nd extension 49 are located between the gear PG2 and the 2 nd brake BR 2. By arranging the 1 st and 2 nd extensions 39, 49 in the axial direction Z close to the gear set PG2, it is easy to arrange the 2 nd brake BR2 also in the axial direction Z close to the gear set PG 2. Therefore, the automatic transmission 1 is further compact in the axial direction Z.

In the above embodiment, the caulking portion 51 is caulked from the 1 st inner extension 37 side of the iron material having a relatively high shear strength and the 1 st outer extension 33 side of the aluminum material having a relatively low shear strength, but the invention is not limited thereto. As shown in fig. 5, the caulking portion 510 may be caulked from the 1 st outer extension 330 side of the aluminum material having a relatively low shear strength to the 1 st inner extension 370 side of the iron material having a relatively high shear strength.

At this time, the caulking portion 510 is caulked from the 1 st outer extension 330 side, which is an aluminum material and has a relatively high thermal expansion coefficient, to the 1 st inner extension 370 side, which is an iron material and has a relatively low thermal expansion coefficient.

Thus, the 1 st outer concave portion 331 of the 1 st outer extension 330 having a relatively high thermal expansion coefficient is inserted into the 1 st inner concave portion 371 formed by the 1 st inner extension 370 having a relatively low thermal expansion coefficient, and constitutes the caulking portion 510. Therefore, at the time of temperature rise, the thermal expansion amount of the 1 st outer concave portion 331 depressed into the 1 st inner concave portion 371 can be made larger than the thermal expansion amount of the 1 st inner concave portion 371, and therefore, the rattling or deviation of the caulking portion 510 due to the difference in thermal expansion amount is easily suppressed.

In this case, the positional relationship between the 1 st outer extension 330 and the 1 st inner extension 370 in the axial direction Z may be changed such that the 1 st outer extension 330 abuts the 1 st inner extension 370 from the axial direction Z2 side, the protrusion 511 of the caulking portion 510 protrudes in the axial direction Z1 side, and at least a part of the protrusion 511 overlaps the recess 450 of the 2 nd inner extension 470 in the Z direction.

In the above embodiment, the 1 st rotating member 30 and the 2 nd rotating member 40 are targeted as rotating members that transmit power between a certain rotating element and the 3 rd clutch CL3, but the present invention is not limited thereto. The present invention can be preferably implemented when the rotating members included in the 1 st clutch CL1, the 2 nd clutch CL2, the 1 st brake BR1, and the 2 nd brake BR2 are formed of different materials in the outer diameter side portion and the inner diameter side portion, and are joined by mechanically joined caulking portions, and the rotating members are adjacent to each other in the axial direction Z.

Practicality of use

As described above, according to the automatic transmission of the present invention, since the rotating member constituting a part of the clutch or the brake can be formed by joining members made of different materials in the axial direction by the caulking portion that is mechanically joined, and the increase in size in the axial direction can be suppressed, the automatic transmission can be preferably used in such a manufacturing technology field.

Description of the numbering

1 automatic transmission

6 Friction plate

10 clutch hub

20 Clutch drum

30 st rotation member

31 st outer rotary member

33 the 1 st outer extension part

36 st inner rotary member

37 the 1 st inner extension part

38 1 st inner cylindrical part

39 th 1 extending part

40 nd 2 nd rotating member

41 nd 2 nd outer rotating member

43 the 2 nd outer extension part

45 concave part

462 inner rotary member

47 nd 2 nd inner extension part

48 2 nd inner cylindrical part

49 nd 2 nd extension part

51. 52 riveting part

CL3 clutch 3

BR 22 nd brake

PG2 gear set 2