JPH10122258A - Trailing prevention device of wet type multi-plate clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any trailing surely by providing a spring member provided with a holding part for holding the outer edge of a friction plate and an elastic piece extending to a periphery direction and deformable to a surface direction. SOLUTION: A spring member 40 is a sheet spring formed by hardening after pressing a steel plate and composed of a holding part 41 for installing by holding the outer edge part of a first friction plate 33a and an elastic piece 42 rangingly arranged adjacent to the holding part 41. The elastic piece 42 is a spring for pulling apart between the first friction plate 33a and a push-press plate and a pressure receive plate. When the holding part 41 of a spring member 40 is held from an outside to the projection part A of the first friction plate 33a, a base part 41a is engaged with a four-sided figure recessed part 34 provided on the projection part A and a reverse stop claw 43 is engaged with a small diameter through hole 35 and fixed. Thereby, the spring member 40 can be fixed stably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drag prevention device for a wet type multi-plate clutch, and more particularly to a drag prevention device for a small multi-plate clutch suitable for vehicles such as automobiles and moving agricultural machines.

[0002]

2. Description of the Related Art Generally, a multi-plate friction clutch is shown in FIG.
As shown in FIG. 7, a number of friction plates H are interposed between the pressure receiving plate F and the pressing plate G, and the clutch is disengaged by moving the pressing plate G forward and backward with respect to the pressure receiving plate F. It has become. Therefore, when the clutch is disengaged, that is, when the pressing plate G is retracted, the friction plate H, the pressing plate G, and the pressure receiving plate F are disengaged.
Alternatively, when an attempt is made to separate the friction plate H from another friction plate H, the lubricating oil sometimes sticks to the friction plate H so that the friction plate H is not separated and a drag phenomenon may occur.

[0003]

Conventionally, as a means for solving such a problem, as shown in FIG.
The spring C is positioned between the shaft and the pressing plate G by the support shaft S.
Is known in which the two plates F and G always act in a direction of separating them. However, in this configuration, drag is prevented between the pressure receiving plate F and the pressing plate G on which the coil spring J is acting. However, the separating action does not work between the friction plates interposed therebetween, and the drag is still present. Remained. On the other hand, as shown in FIG. 7, it is also known that an O-ring K is sandwiched between a pressure receiving plate F and a pressing plate G, and a friction plate rotating integrally with the pressure receiving plate F in a slightly compressed state, and separated by its elasticity. . However, in this configuration, the O-ring is deformed due to the centrifugal force caused by the rotation of the clutch, and the force separating the friction plates becomes unstable. The separating force was reduced, causing dragging. Further, in the assembling work, it is necessary to assemble the friction plates and the O-rings alternately, which is not easy.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and has a holding portion for holding an outer edge of a friction plate, a circumferential portion extending from the holding portion and being deformable in a surface direction. And a spring member provided with an elastic part. More specifically, a first friction plate having an outer cylinder and an inner shaft coaxially arranged and being movably locked to the outer cylinder only in the axial direction, and being movably locked to the inner shaft only in the axial direction. A friction member provided between the pressure receiving plate and the pressing plate, and a spring member attached to an outer edge of the first friction plate. A base having a member disposed along the outer edge and two legs extending to one side from both ends of the base form a substantially U-shaped holding portion, and extend in a circumferential direction from the leg and have a surface. It is preferable to provide an elastic part which can be deformed in the direction. More specifically,
The spring member is formed of a leaf spring, and the substantially U-shaped holding portion and the elastic piece are formed integrally by pressing a single steel plate. Further, the spring member forms an engaging member projecting inward on the leg portion, and the engaging member is engaged with an engaging recess provided slightly inside the outer edge of the friction plate to prevent the friction member from falling off.

[0005]

The spring member is mounted so as to sandwich the outer edge of the friction plate. Then, a spring that is deviated in the surface direction by extending in the circumferential direction from the holding portion is formed. The spring member is attached to a projection A, which forms the peripheral edge of the first friction plate, with the spring A interposed therebetween, and most of the spring member is housed inside a slit formed in the outer cylinder. An elastic portion that extends in the circumferential direction and is deformable in the surface direction is provided on the holding portion of the spring member so as to protrude, and when the pressing plate advances toward the pressure receiving plate, elastic deformation is performed by the adjacent friction plate. Receiving and pushing back the adjacent friction plate when the pressing plate retreats. Since the spring member is interposed between the friction member and the rotating friction plate, no friction is generated between the spring member and the adjacent friction plate. The spring member is made by pressing a steel plate and made thin, so that the amount of protrusion from the outer edge of the first friction plate is kept to a minimum, and stable elasticity is maintained for a long time in lubricating oil to prevent dragging. Function is retained. The spring member has a substantially U-shaped holding portion formed by the base portion and the leg portion. The holding portion faces the inner surface of the base portion to the outer peripheral surface of the first friction plate, and engages the engaging element provided on the leg portion with the first friction. As long as the first friction plate is rotated, the first friction plate is resistant to centrifugal force and is not disassembled unless it is disassembled artificially.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In the figure, reference numeral 10 denotes a wet type multi-plate clutch utilizing the invention of the present application, and its friction plate is lubricated with lubricating oil. The illustrated multi-plate clutch 10 is used to switch the rotation of an input shaft 11 between an inner shaft 12a on the left side and an inner shaft 12b on the right side, which form an output shaft, and output the same. The connection between the inner shaft 12a and the inner shaft 12b of the multi-plate clutch 10 is substantially symmetrical, and the functions thereof are also substantially the same. Therefore, the following description will be made for the left inner shaft 12a and the right inner shaft 12a. Shaft 12b
Items related to are omitted.

The input shaft 11 is screwed to the boss 15, and rotation of the input shaft 11 is transmitted to the boss 15. The boss 15 is connected to an outer cylinder 17 through a disc-shaped flange 16.
And are formed integrally. A hydraulic cylinder 21 is formed between the boss 15 and the outer cylinder 17, and a piston 22 is slidably fitted therein. 23 is a return spring of the piston 22. The inside of the hydraulic cylinder 21 is connected to a hydraulic pump (not shown) via an oil passage 15a formed in the boss 15 and an oil passage (not shown) provided on the input shaft 11. Reference numeral 15b denotes a discharge path for releasing the pressure oil supplied into the hydraulic cylinder 21.

An axially extending slit 18 is formed at the end of the outer cylinder 17, and the slit 18 includes a pressing plate 31, a pressure receiving plate 32, and several first friction plates 33a.
At the protruding portions A protruding in the radial direction on the outer circumference thereof, they are movably locked only in the axial direction. Further, the second friction plate 33b forming the driven side is connected to the first friction plate 33.
a, and has a spline-shaped projection B on the inner peripheral surface thereof, and is spline-coupled to the inner shaft 12a. Reference numeral 19 denotes a thrust washer for supporting the pressure receiving plate 32 to the outer cylinder 17 in an axially immovable manner. In this embodiment, the pressing plate 31 and the first friction plate 33a have different names but are substantially the same.

Since the multi-plate clutch 10 is constructed as described above, when pressure oil is supplied to the back of the piston 22 to engage the clutch, the piston 22 returns to the return spring 2.
3 and pushes the back surface of the pressing plate 31 to advance toward the pressure receiving plate 32. As a result, both friction plates 33
a and 33b are sandwiched between the pressure receiving plate 32 and the pressing plate 31, and the rotation of the outer cylinder 17 is transmitted to the inner shaft 12a via the friction plates 33a and 33b. When the pressure oil supplied to the rear surface of the piston 22 is released to disengage the engaged clutch, the piston 22 retreats due to the elasticity of the return spring 23, and the pressing force of the pressing plate 31 disappears. The above configuration and operation are not much different from those of a conventionally known wet-type multi-plate clutch.

FIG. 2 shows a spring member 4 which is an essential part of the present invention.
0 shows the structure of connection with the first friction plate 33a. That is, the first friction plate 33a is formed in a substantially annular shape, and has a substantially quadrangular protrusion A protruding in the radial direction on its outer edge so as to movably engage with the slit 18 only in the axial direction. The protruding portion A is formed with a rectangular notch 34 and a small-diameter through hole 35 serving as an engagement concave portion formed on the inside of the inner wall. The spring member 40 forms a leaf spring formed by press-forming and quenching a steel plate, and is disposed adjacent to the holding portion 41 for holding the outer edge of the first friction plate 33a with the holding portion 41 interposed therebetween. And the elastic part 42. The elastic piece 42 includes the first friction plate 33a, the pressing plate 31, the pressure receiving plate 32,
Alternatively, it forms a spring that separates it from the other first friction plate 33a. Note that the spring member 40 is connected to the first friction plate 33.
It is attached to the protrusion A which is symmetrical with respect to the rotation axis of a. Therefore, when the sandwiching portion 41 of the spring member 40 is sandwiched from outside to the projecting portion A of the first friction plate 33a, the base 41
a engages with the rectangular recess 34 provided in the protruding portion A, and the check pawl 43 engages with the small-diameter through hole 35 and is fixed. That is, the spring member 40 can be assembled prior to assembling the first friction plate 33a inside the outer cylinder 17. Further, if the small-diameter through hole 35 is a square hole and the check claw 43 is square, the spring member 40 is more stably fixed.

The holding portion 41 includes the first friction plate 33a.
An elongated base 41a opposed to the outer surface of the projection A of the base member and two legs 41b, 41b formed by bending both ends of the base 41a to one side are provided, and the cross-sectional shape is substantially U-shaped. Is done. Further, the leg portions 41b, 41b are provided with a check claw 43 bent inward as shown in FIG. Therefore, in order to assemble the spring member 40 to the first friction plate 33a, the U-shaped open portion is directed from the outside of the protrusion A toward the center, and the base 41a is formed in the protrusion A. Push until it touches 34. Base 4
1a comes into contact with the concave portion 34, and at the same time, the check pawl 43 is fitted into the small-diameter through hole 35 serving as the engaging concave portion.
0 cannot be advanced in the reverse direction and is prevented from falling off.

As shown in FIG. 3, the elastic piece 42 has an elongated trapezoidal shape extending in the circumferential direction from the leg of the holding section 41, and the spring constant and other characteristics are appropriately set by this shape. As shown in FIG. 4, the elastic piece 42 extends in the surface direction, that is, in the direction away from the first friction plate 33a, and the pressing plate 31, the pressure receiving plate 32, or the first friction plate 33a which is adjacent at its tip end. It is assembled in a slightly compressed state so that it does not rattle.

[0013]

According to the present invention, since the spring member 40 is attached to the outer edge of the friction plate, both can be performed separately from the assembly work of the clutch, and the workability of the assembly work is good. In addition, it is made of a thin steel plate and is lightweight, and does not break the rotational balance of the clutch. Since the first friction plates 33a disposed between the pressing plate 31 and the pressure receiving plate 32 are individually separated by the spring member 40, the respective friction surfaces are individually separated during the disengagement operation of the multi-plate clutch 10. The drag is reliably prevented. Further, the spring member 40 has a radially projecting portion A formed on the outer edge of the first friction plate 33a.
, So that most of the device fits within the width of the slit, and the device does not become large. And so on.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a multiple disc clutch showing one embodiment of the present invention. The description of the spring member 40, which is a main part of the present invention, is omitted, and is enlarged and shown in FIGS.

FIG. 2 is an external view of a main part thereof.

FIG. 3 is a view as viewed in the direction of arrows in FIG. 2;

FIG. 4 is an arrow IV view in FIG. 3;

FIG. 5 is a sectional view taken along the line VV.

FIG. 6 is a sectional view of a main part showing a conventional multi-plate clutch.

7 is a cross-sectional view of a main part corresponding to FIG. 6, showing another conventional multi-plate clutch.

[Explanation of symbols]

10 multi-plate clutch 11 input shaft 12a, 12b inner shaft (output shaft) 15
・ Boss 15a ・ ・ ・ ・ Oil passage 15b ・ ・ ・ Discharge passage 16 ・ ・ ・ ・ Flange 17 ・ ・ ・ ・ Outer cylinder 18 ・ ・ ・ ・ Slit 19 ・ ・ ・ ・ Thrust washer 21 ・ ・ ・ ・ Hydraulic cylinder 22 ・... Piston 23 ... Return spring 31 ... Press plate 32 ... Pressure receiving plate 33 (33a, 3
3b) ... friction plate 34 ... notch 35 ... through-hole (engaging recess) 40 ... spring member 41 ... holding portion 41a ... base 41b ... leg Part 42 ... Elastic part piece 43 ... Non-return claw A, B ... Projecting part

Claims (4)

[Claims] An anti-dragging device for a wet-type multi-plate clutch having a spring member having a holding portion for holding an outer edge of a friction plate, and an elastic portion extending in a circumferential direction and deformable in a surface direction from the holding portion. 2. A first friction plate having an outer cylinder and an inner shaft arranged coaxially and movably engaged with the outer cylinder only in the axial direction, and being movably engaged with the inner shaft only in the axial direction. A second friction plate, wherein both friction plates are disposed between the pressure receiving plate and the pressing plate, and further comprising a spring member attached to an outer edge portion of the first friction plate. A base portion arranged along the outer edge portion, and two legs extending to one side from both ends of the base portion to form a substantially U-shaped holding portion, extending in a circumferential direction from the leg portion and in a plane direction. An anti-dragging device for a wet multi-plate clutch, which is provided with a deformable elastic piece. 3. The spring member according to claim 1, wherein the spring member is a leaf spring, and the substantially U-shaped holding portion and the elastic piece are formed by pressing a single steel plate into one piece. Drag prevention device for the formed wet multi-plate clutch. 4. The spring member according to claim 1, wherein the spring member has an engaging member projecting inward from the leg portion, and the engaging member is engaged with an engaging concave portion provided on the inner side of the outer edge of the friction plate. Anti-dragging device for wet multi-plate clutch.