JP2001295860A - Belleville spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a belleville spring having claws. SOLUTION: This belleville spring 15 is provided with a conical elastic part 17 and a plurality of claws 18A for rotation-directional engagement extending radially from its edge. The root part of the claw 18A approaches in the axial direction of a driven plate 11 from the edge of the elastic part 17. As a result, the axial distance S between the root part 18a of the claw 18A and the edge of the elastic part 17 is 0.05 mm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc spring, and more particularly to a disc spring used in a device in which a plurality of disc plates arranged in an axial direction can be connected and disconnected from each other.

[0002]

2. Description of the Related Art Conventionally, a disc spring called a dish plate is used in a multi-plate clutch used for a transmission of a vehicle, for example. The disc spring is an annular and disc-shaped leaf spring and has a conical shape. With this disc spring, a cushioning action to reduce the shock when the clutch is connected can be obtained.

[0003]

In a conventional disc spring, for example, a plurality of claws are formed on an outer peripheral edge, and these claws are engaged with one member of the apparatus so as to be relatively non-rotatable.
Thereby, the disc spring does not slide in the rotational direction with respect to the adjacent member, and the problem that the counterpart member is attacked by the disc spring is eliminated.

However, in a conventional disc spring having claws,
There is known an example in which durability is reduced by the shape of the nail. Specifically, there is a problem that the tip of the claw portion interferes with the mating member. In this case, a bending stress is applied near the base of the nail, so that the nail is easily damaged. Further, since the claw root portion protrudes outward in the axial direction from the edge of the elastic portion, only the claw root portion is in contact with the counterpart member. That is, the corners of the outer peripheral edge of the elastic portion do not abut on the mating member, and the claw roots partially disposed in the circumferential direction abut on the mating member. In this case, when the disc spring is compressed in the axial direction, a bending stress is applied to the vicinity of the base of the claw, and the disc spring is easily broken.

An object of the present invention is to improve the durability of a disc spring having a claw.

[0006]

According to a first aspect of the present invention, there is provided a disc spring which is used in a device in which a plurality of disk-shaped plates arranged in the axial direction can be connected to and disconnected from each other. It is located between them. The disc spring has a conical elastic portion and a plurality of rotationally engaging claws extending radially from an edge thereof. The base of the nail is 2 from the edge of the elastic part
One of the three members is axially close to one of the members that is close to the axial direction. The axial distance between the base of the nail and the edge of the elastic portion is 0.05 mm or less. The root of the nail is
The part of the nail that is close to the boundary between the nail and the elastic part.

In this disc spring, the base of the claw is axially closer to the mating member than the edge of the elastic portion, but the axial distance between the edge of the elastic portion and the mating member is 0.05 mm. Since it is smaller than the following, the bending stress generated near the claw root portion when the disc spring is compressed is reduced. According to another aspect of the present invention, a plurality of disc-shaped plates arranged in the axial direction are used in a device capable of connecting and disconnecting each other, and are disposed between two members in the axial direction. The disc spring includes a conical elastic portion and a plurality of rotationally engaging claws extending radially from an edge of the elastic portion. The nail base is located at the same axial position as the edge of the elastic portion.

In this disc spring, since the base of the claw is located in the same axial direction as the edge of the elastic portion, not only the base of the claw but also the edge of the elastic portion directly contacts the mating member.
Therefore, bending stress is less likely to be generated near the root of the claw when the disc spring is compressed. According to a third aspect of the present invention, a plurality of disk-shaped plates arranged in the axial direction are used in a device capable of connecting and disconnecting each other, and are disposed between two members in the axial direction. The disc spring has a conical elastic portion and a plurality of rotationally engaging claws extending radially from an edge thereof. The base of the claw is axially separated from one of the two members, which is close to the axial direction, from the edge of the elastic portion.

In this disc spring, the base of the claw is separated from the mating member which is closer in the axial direction than the edge of the elastic portion. Contact directly. Therefore, bending stress is less likely to be generated near the root of the claw when the disc spring is compressed. In the disc spring described in claim 4, in any one of claims 1 to 3, the claw is
It extends radially inclining with respect to a plane perpendicular to the axis of rotation of the device, and moves axially away from one member toward the tip.

In this disc spring, the pawl is inclined and is separated in the axial direction from one of the members approaching in the axial direction, so that the tip of the pawl does not easily contact the adjacent one of the members. As a result, bending stress is less likely to occur near the base of the nail. According to a fifth aspect of the present invention, a plurality of disk-shaped plates arranged in the axial direction are used in a device capable of connecting and disconnecting each other, and are disposed between two members in the axial direction. The disc spring has a conical elastic portion having a plurality of rotationally engaging claws extending radially from an edge thereof. The pawl extends radially inclining with respect to a plane perpendicular to the axis of rotation of the device, and moves axially away from one of the two members that is axially closer to the distal end.

[0011] In this disc spring, the claw is inclined and is separated in the axial direction from one member that is close in the axial direction, so that the tip of the claw hardly contacts the one member that is close. As a result, bending stress is less likely to occur near the base of the nail.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Basic Structure FIG. 1 is a schematic longitudinal sectional view of a clutch 1 employing a dish plate 15 (disc spring) as an embodiment of the present invention. The clutch 1 is a wet multi-plate clutch used for a transmission. The rotation axis of the clutch 1 extends in the left-right direction in FIG.

The clutch 1 includes a driven member 2, a drive member 3, a clutch connecting portion 4 disposed therebetween,
It mainly comprises a piston 5, a return spring 6, and the like. The driven member 2 is a cylindrical clutch drum 2
a. The drum 2a has a plurality of engaging teeth 2b extending in the axial direction on the inner peripheral side. The drive member 3 has a cylindrical clutch hub 3a on the inner peripheral side of the drum 2a. A plurality of engaging teeth 3b extending in the axial direction are formed on the outer peripheral surface of the hub 3a.

The clutch connecting portion 4 mainly includes a driven plate 11, a drive plate 12 and a snap ring 14.
And a dish plate 15. The driven plate 11 is a disk-shaped plate, and outer peripheral teeth 11a are formed on the outer peripheral edge thereof so as to be engaged with the engaging teeth 2b of the drum 2a so as to be relatively non-rotatable and movable in the axial direction. The drive plate 12 is disposed between the driven plates 11 in the axial direction, and has an inner peripheral edge formed with inner peripheral teeth 12a which engage with the hub 3a so as to be relatively non-rotatable and movable in the axial direction. The snap ring 14 is fixed to the tip end of the drum 2 a and receives the load of the clutch connecting portion 4. Dish plate 15
Are arranged at the most right side of the clutch connecting portion 4 in FIG. The structure of the dish plate 15 will be described later in detail.

The piston 5 is a member driven in the axial direction by a hydraulic circuit, and has a pressing portion 5a on its outer peripheral portion for acting on the clutch connecting portion 4. The pressing portion 5a is disposed on the dish plate 15 on the right side in FIG.
The return spring 6 is a disc-shaped spring, and is axially compressed when the piston 5 moves to the leftmost position in FIG. 1 and the clutch connecting portion 4 is turned on. Therefore, when the supply of hydraulic pressure to the piston 5 is stopped, the load from the return spring 6 causes the piston 5 to move rightward in FIG.

The dish plate 15 is disposed between the driven plate 11 and the pressing portion 5a of the piston 5 in the axial direction. As shown in FIG.
Is a disk-shaped and annular plate member, and has a conical elastic portion 17 and a plurality of claws 18 extending radially outward from an outer peripheral edge of the elastic portion 17. As shown in FIG. 1, the inner peripheral edge 17a of the elastic portion 17 is
It is supported in the axial direction by 5a. Also, the elastic part 1
7 is supported in the axial direction by the driven plate 11. The claw 18 of the dish plate 15 is inserted into a groove between a plurality of engagement teeth 2b formed on the inner peripheral surface of the drum 2a. Thereby, the dish plate 15 rotates integrally with the driven plate 11 and the driven member 2. In addition, dish plate 15
As an example, the dish plate 15 is made of SK5, the inner diameter is about 164 mm, the outer diameter is about 180 mm,
The plate thickness is about 1.82 mm. However, the above numerical values are described for the purpose of understanding the outline of the dish plate 15, and the present invention is not limited to these numerical values.

Next, the shape near the claw 18 in each embodiment will be described in detail. First Embodiment In the dish plate 15 shown in FIG. 4, the claws 18A extend radially outward from the outer peripheral edge 17b of the elastic portion 17. The pawl 18A extends along a plane perpendicular to the rotation axis direction of the clutch 1 (corresponding to the surface of the adjacent driven plate 11).
Therefore, the claw 18A is substantially parallel to the plane of the driven plate 11, which is the other member, and the base portion 1
8a, including 8a. In this embodiment, the driven plate 11 on the outer peripheral edge 17b of the elastic portion 17 is used.
The side angle 17c is separated from the side surface of the driven plate 11 of the claw 18A by a distance S in the axial direction. That is, the elastic portion 17
A distance S in the axial direction is secured between the corner 17c and the plane of the driven plate 11. This distance S is 0.05m
m or less. Further, the distance S may be 0 mm, and the axial position of the corner 17c and the surface of the claw 18A on the driven plate 11 side may be the same.
In that case, not only the claw 18A but also the outer peripheral edge 17 of the elastic portion 17
The corner 17c of b is also in contact with the driven plate 11.
In this embodiment, when the dish plate 15 is compressed in the axial direction, since the axial distance S between the outer peripheral edge 17b of the elastic portion 17 and the adjacent partner is very small, the outer peripheral edge 17b of the elastic portion 17 ( In particular, the corner 17c) serves as an initial load fulcrum, and a load acts on the corner 17c which is long in the shape of an arc and extends entirely. As a result, bending stress generated at the root portion 18a of the nail 18A is reduced. Therefore, the durability of the dish plate 15 is improved. Second Embodiment The dish plate 15 shown in FIG. 5 is different from the first embodiment only in that the claws 18B are inclined with respect to a plane perpendicular to the rotation axis of the clutch 1. Claws 18
B is inclined by a certain angle θ with respect to the plane of the driven plate 11, and specifically, is inclined away from the driven plate 11, which is a mating member, from the root portion 18a toward the tip. As a result, the nail 18
Only the root portion 18a of B (more precisely, the surface of the root portion 18a on the driven plate 11 side) is the driven plate 1
It is in contact with 1. In this configuration, the tip of the claw 18B hardly interferes with the driven plate 11, and as a result, bending stress is hardly generated near the root 18a of the claw 18B. The angle θ formed by the claw 18B with respect to the driven plate 11 is preferably in the range of 0.5 ° to 20 °. If the angle θ exceeds 20 °, interference with the mating member may occur, and cracking during bending may be a problem. When the angle θ is less than 0.5 °, the durability is not sufficiently improved.

Even if the axial distance S exceeds 0.05 mm, a sufficiently excellent effect can be obtained by the inclination of the nail. However, the axial distance S is 0.05 mm as in the first embodiment.
In the case where it is set as follows, the effect of inclining the claw is added to the effect of the first embodiment, so that the durability of the disc spring is remarkably improved by a synergistic effect of the both. Specifically, when the dish plate 15 is compressed in the axial direction, the axial distance S between the outer peripheral edge 17b of the elastic portion 17 and the adjacent partner member is very small or 0, so that the elastic portion 17 The outer peripheral edge 17b (especially the corner 17c) serves as an initial load fulcrum, and as a result, bending stress generated at the root portion 18a of the claw 18B is reduced. Therefore, the durability of the dish plate 15 is improved. Third Embodiment In the dish plate 15 shown in FIG. 6, the claws 18C extend substantially parallel to a plane perpendicular to the rotation axis of the clutch 1. The corner 17c of the outer peripheral edge 17b of the elastic portion 17 on the driven plate 11 side is the first angle from the claw 18C.
It protrudes in the axial direction, and is in contact with the driven plate 11, which is a mating member. As a result, the nail 18C
Is the driven plate 11 including the root portion 18a.
Are separated by an axial distance S from the plane No. Since the outer peripheral edge 17b (particularly, the corner 17c) of the elastic portion 17 is securely in contact with the driven plate 11, when the dish plate 15 is compressed in the axial direction, the corner 17c, which is long in the shape of an arc and extends entirely, is formed. The load acts on. That is, nail 1
Bending stress is less likely to be generated at the root portion 18a of the 8C. As a result, the nail 18C is hardly damaged, and the life of the dish plate 15 is extended. Note that the axial distance S is 0 to 0.5
mm. Fourth Embodiment The dish plate 15 shown in FIG. 7 differs from the third embodiment only in that the claw 18D is inclined with respect to a plane perpendicular to the rotation axis of the clutch 1. Claws 18
B is inclined at a fixed angle θ with respect to the plane of the driven plate 11, and specifically, the claw 18D is
It is inclined so as to move away from the plane of the driven plate 11, which is the mating member, from the top to the tip. Since the tip of the claw 18D is less likely to interfere with the driven plate 11, the root portion 18a of the claw 18D
Bending stress is hardly generated in the vicinity. As a result, the nail 18D is less likely to be damaged, and the life of the dish plate 15 is extended. In this embodiment, the effect of tilting the nail is added to the effect of the third embodiment. The durability is remarkably improved. [Other Embodiments] The dish plate according to the present invention may be arranged at another position in the above embodiment.

Further, the dish plate according to the present invention can be used not only for clutches but also for other devices such as brakes. Also, the clutch is not limited to the wet multi-plate clutch of the transmission, but may be employed for a lock-up device of a torque converter, a power cut-off clutch, and other clutches and brakes.

[0020]

According to the disc spring of the present invention, bending stress is less likely to be generated in the vicinity of the base of the pawl, and the life of the disc spring is improved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a clutch of a transmission employing one embodiment of the present invention.

FIG. 2 is a plan view of a dish plate.

FIG. 3 is a partial plan view of a dish plate.

FIG. 4 is a cross-sectional view of the dish plate according to the first embodiment.

FIG. 5 is a plan view of a dish plate according to the second embodiment.

FIG. 6 is a sectional view of a dish plate according to a third embodiment.

FIG. 7 is a longitudinal sectional view of a dish plate according to a fourth embodiment.

[Explanation of symbols]

 15 Dish plate 17 Elastic part 18A, 18B, 18C, 18D Claw

Claims (5)

[Claims] A disc spring disposed between two members in an axial direction, wherein a plurality of disc-shaped plates arranged in the axial direction are used in a device which can be connected and disconnected from each other. An elastic portion; and a plurality of rotationally engaging claws extending in a radial direction from an edge of the elastic portion. A root portion of the nail is closer to the axial direction of the two members than the edge of the elastic portion. It is characterized by being closer to one member in the axial direction, and the axial distance between the base of the claw and the edge of the elastic portion is 0.05 mm or less.
Disc spring. 2. A conical disk spring comprising a plurality of disc-shaped plates arranged in an axial direction, which is used in a device which can be connected and disconnected from each other, and which is disposed between two members in an axial direction. An elastic portion, and a plurality of claws for rotational engagement extending in a radial direction from an edge of the elastic portion, wherein a root portion of the claw is located in the same axial direction as the edge of the elastic portion. ,Disc spring. 3. A conical disk spring comprising a plurality of disc-shaped plates arranged in an axial direction used in a device capable of connecting and disconnecting each other, wherein said disc spring is disposed between two members in an axial direction. An elastic portion; and a plurality of rotationally engaging claws extending in a radial direction from an edge of the elastic portion. A root portion of the nail is closer to the axial direction of the two members than the edge of the elastic portion. A disc spring characterized by being axially separated from one member. 4. The claw extends radially so as to be inclined with respect to a plane perpendicular to the rotation axis of the device, and moves away from the one member in the axial direction toward the tip. The disc spring according to any one of claims 1 to 3, characterized in that: 5. A conical disc spring comprising a plurality of disc-shaped plates arranged in an axial direction, which are used in a device which can be connected and disconnected from each other, and which is disposed between two members in an axial direction. An elastic portion; and a plurality of rotation-direction engaging claws extending in a radial direction from an edge of the elastic portion, wherein the claws are radially inclined so as to be inclined with respect to a plane perpendicular to a rotation axis of the device. A conical disc spring, wherein the conical spring extends axially away from one of the two members that is close to the axial direction toward the tip.