JP2008196628A - Clutch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutch device capable of preventing a retaining plate from being pressed against a drive plate. <P>SOLUTION: This clutch device is provided with: a brake piston 20 axially movable in a drum; the retaining plate 17 arranged on an opening side in the drum, and having an external tooth; a plurality of drive plates 18a gearing with a spline of a drive hub between the brake piston 20 and the retaining plate 17; a plurality of driven plates 18b fitted by being alternately stacked with the plurality of drive plates 18a, and gearing with a spline of the drum; and a snap ring 16 for preventing escape of the drive plates 18a and the driven plates 18b, and has a clip 30 for fixing the retaining plate 17 to the snap ring 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a clutch device.

  Conventionally, in a friction engagement element such as a multi-plate clutch or a multi-plate brake, a drive plate connected to a power input side and a driven plate connected to a power output side are alternately arranged. By sandwiching both the friction plates between the retaining plate and the piston, the friction plates are pressure-bonded, and torque is transmitted and received between the plates to transmit power.

Patent Documents 1 and 2 have been proposed as a method of restraining the retaining plate on the drum. The technique described in Patent Document 1 has a structure in which a snap ring is attached to one side of a retaining plate and a spline step or a stopper ring is attached to the other side to prevent the retaining plate from moving toward the clutch. In the technique described in Patent Document 2, a notch in a direction perpendicular to the spline direction is provided in the drum of the retaining plate mounting portion, and the outer peripheral projection of the retaining plate is fitted into the notch, and the retaining plate is formed by an elastic member. It has a structure that prevents omission.
JP-A-5-87156 JP-A-9-53657

  However, according to the method of Patent Document 1, it is necessary to provide a dish plate having a size that gives a preload to the snap ring and the retaining plate between the snap ring and the retaining plate. Getting worse. Furthermore, it is necessary to form a step portion as a stopper in the middle of the spline, and the configuration becomes complicated. On the other hand, according to the method of Patent Document 2, although the retaining plate is restricted in rotational movement in the torque transmission direction, it is relatively easy to move in a direction parallel to the fitting groove of the spline. . For this reason, when the clutch mechanism including the retaining plate is mounted on the vehicle obliquely with respect to the ground, the retaining plate may move toward the drive plate due to the weight of the retaining plate. If the retaining plate is pressed against the drive plate, the friction loss may increase due to frictional engagement of the friction plates even when the piston is not operating.

  The present invention has been made in view of the above-described problems, and provides a clutch device that has a simple structure and is excellent in assembling workability and can prevent the retaining plate from being pressed against the drive plate. Objective.

  In order to solve the above problems, a clutch device of the present invention includes a piston that is movable in an axial direction in a drum, a retaining plate provided on an opening side in the drum, the piston, and the retaining plate. A plurality of drive plates that engage with the splines of the drive hub, a plurality of driven plates that are alternately overlapped with the plurality of drive plates, and are engaged with the splines of the drum, and are fixed to the drum And a snap ring for preventing the drive plate and the driven plate from escaping, and a clip for preventing the retaining plate from moving away from the snap ring. With this configuration, it is possible to prevent the retaining plate from being pressed against the drive plate by its own weight with a simple configuration. Therefore, friction loss can be reduced and fuel consumption can be improved.

  The retaining plate has external teeth protruding in the outer peripheral direction, and the clip is in contact with the gripping portion for gripping the external teeth of the retaining plate and the snap ring, and the shaft of the retaining plate And a holding unit that restricts movement in the direction. With this configuration, it is possible to improve the mounting workability with a simple structure. The holding part is elastically deformable in the axial direction. With this configuration, it is possible to absorb the difference in thickness of the retaining plates and cope with retaining plates having different thicknesses with the same clip.

  According to the present invention, it is possible to provide a clutch device that can prevent the retaining plate from being pressed against the drive plate with a simple configuration.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.

  FIG. 1 is a view for explaining a clutch device 1 according to an embodiment of the present invention. Although not shown, the power transmission train of the automatic transmission is provided with a torque converter, an oil pump, and a multi-stage transmission 3 from the input side, and the driving force from the engine output shaft passes through the torque converter and passes through the multi-stage transmission 3. Is transmitted to the input shaft.

  The multi-stage transmission 3 includes a front planetary gear unit 3a and a rear planetary gear unit 3b. A high clutch (not shown), a reverse clutch 9 and a brake 10 are arranged in parallel on the side of the front planetary gear unit 3a. A reverse clutch drum 9a of the reverse clutch 9 is formed continuously with a high clutch drum (not shown), and a reverse clutch hub 9b opposite to the reverse clutch drum 9a is connected to the front ring gear of the front planetary gear unit 3a. ing. A reverse clutch hub 9b is connected to the brake hub 10a of the brake 10, and a cylindrical brake drum 10b facing the brake hub 10a is formed integrally with the automatic transmission case.

  A low clutch 13 is disposed on the outer periphery of both planetary gear units 3a and 3b, a low clutch drum 13a of the low clutch 13 is connected to a front planetary carrier, and a low clutch hub provided opposite to the low clutch drum 13a is provided at the rear. It is connected to the rear ring gear of the planetary gear unit 3b.

  In the brake 10, a snap ring 16 is fitted on the inner periphery of the opening end of the brake drum 10 b that faces in the torque converter direction, and a retaining plate 17 is disposed inside the snap ring 16. Drive plates 18a and driven plates 18b are alternately arranged on the inner surface of the inner plate, and a pressure plate 19 is arranged on the inner surface of the innermost drive plate 18a. A piston operation (not shown) is provided on the inner surface of the pressure plate 19. A brake piston 20 extending from the chamber is provided.

  The retaining plate 17 is provided on the opening side in the drum and has external teeth 17a provided so as to protrude in the outer peripheral direction. The brake piston 20 is movable in the axial direction toward the bottom surface in the drum. The drive plate 18a and the driven plate 18b function as friction fastening members. The plurality of drive plates 18a are engaged with the splines 10c of the brake hub 10a between the brake piston 20 and the retaining plate 17, and are supported so as to be movable in the axial direction.

  The plurality of driven plates 18b are alternately overlapped and fitted with the plurality of drive plates 18a, engaged with the splines 10d of the brake drum 10b, and supported so as to be movable in the axial direction. The pressure plate 19 presses the drive plate 18a and the driven plate 18b in the axial direction. The retaining plate 17, the drive plate 18a, and the driven plate 18b form a friction plate. The snap ring 16 is fixed to the brake drum 10b and prevents the drive plate 18a and the driven plate 18b from escaping. The clip 30 is a plate-like elastic member and is used to fix the retaining plate 17 to the snap ring 16, and prevents the retaining plate 17 from moving in a direction away from the snap ring 16. The clip 30 locks the retaining plate 17 to the snap ring 16 using the space of the groove portion of the retaining plate 17.

  In the clutch device 1 as described above, the brake piston 20 is moved in the direction of pressing the friction plate against the return spring by the hydraulic pressure supplied to the back side thereof. Further, the retaining plate 17 and the driven plate 18b rotate together with the brake drum 10b, and the drive plate 18a rotates together with the brake hub 10a so that they rotate at different speeds, and hydraulic pressure is applied to the brake piston 20. When the drive plate 18a and the driven plate 18b are pressed, they are gradually fastened while being frictioned with each other, and the brake drum 10b and the brake hub 10a rotate at the same speed, and the rotational force of the brake hub 10a is transmitted. When the brake drum 10b and the brake hub 10a are rotating at different speeds, oil is supplied from the shaft core via the oil passage, and is supplied to the friction plate through a hole formed in the brake hub 10a by centrifugal force. The plate is lubricated and cooled.

  FIG. 2 is an enlarged perspective view of the clip 30. FIG. 3 is a diagram illustrating a usage state of the clip illustrated in FIG. 2. The clip 30 includes a grip portion 31 that grips the external teeth 17 a of the retaining plate 17 and a holding portion 32 that is elastically deformable in the axial direction when contacting the snap ring 16. The gripping portion 31 is constituted by three gripping plates 31a, 31b, and 31c, and grips the circumferential side surface of the external teeth 17 and the lower portion on the clutch plate side so as to surround the external teeth 17 of the retaining plate 17. The retaining plate is selected from several types having different thicknesses to adjust the clutch clearance. As described above, since the holding portion 32 of the clip 30 can be elastically deformed in the axial direction, the difference in thickness of the retaining plate is absorbed, and the same clip can be used for retaining plates having different thicknesses. Can do.

  When using the clip 30, first, the grip portion 31 of the clip 30 is attached to the external teeth 17 a of the retaining plate 17. The retaining plate 17 is inserted into the automatic transmission case. Next, the snap ring 16 is fixed between the holding portion 32 of the clip 30 and the retaining plate 17. In the clutch device 1 according to the present embodiment, the snap ring 16 used for retaining the retaining plate 17 and the retaining plate 17 are engaged with the clip 30 that is an elastic member, thereby rotating the multi-plate clutch. Even when the shaft is inclined, since the snap ring 16 holds the retaining plate 17, the holding portion 32 restricts the movement of the retaining plate in the axial direction, and the axial direction of the retaining plate 17 due to the gravity of the retaining plate 17. Force no longer acts on the clutch plate.

  FIG. 4 is a diagram showing a modification of the shape of the clip. FIG. 5 is a diagram illustrating a usage state of the clip illustrated in FIG. 4. The clip 40 includes a gripping portion 41 that grips the external teeth 17 a of the retaining plate 17 and a holding portion 42 that can be elastically deformed when contacting the snap ring 16. The shape of the holding portion 42 is different from that of the clip 30 in FIG.

When using the clip 40, first, the grip portion 41 of the clip 40 is attached to the external teeth 17 a of the retaining plate 17. The retaining plate 17 is inserted into the automatic transmission case. Next, the snap ring 16 is fixed between the holding portion 42 of the clip 40 and the retaining plate 17. The left and right and the lower part are held by the holding plates 41a, 41b and 41c.

  As described above, in the clutch device according to the embodiment of the present invention, by providing the clips 30 and 40 for fixing the retaining plate 17 to the snap ring 16, the retaining plate 17 is clutched by the inclination of the rotating shaft of the multi-plate clutch. It is possible to prevent the clutch plate from sliding and rotating by moving toward the plate and pressing the clutch plate in one direction by the retaining plate 17. Therefore, friction loss can be reduced and fuel consumption can be improved.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the gist of the present invention described in the claims. It can be changed.

It is a figure for demonstrating the clutch apparatus which concerns on embodiment of this invention. 3 is an enlarged perspective view of a clip 30. FIG. It is a figure which shows the use condition of the clip shown in FIG. It is a figure which shows the modification of the shape of a clip. It is a figure which shows the use condition of the clip shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Clutch apparatus 3 ... Multi-stage transmission 3a ... Front planetary gear unit 3b ... Rear planetary gear unit 9 ... Clutch 9a ... Reverse clutch drum 9b ... Reverse clutch hub 10 ... Brake 10a ... Brake hub 10b ... Brake drum 13 ... Low clutch 13a ... Low Clutch drum 16 ... Snap ring 17 ... Retaining plate 17a ... External teeth 18a ... Drive plate 18b ... Driven plate 19 ... Pressure plate 20 ... Brake piston 30, 40 ... Clip 31,41 ... Holding part 32,42 ... Contact part

Claims (3)

A piston movable axially within the drum;
A retaining plate provided on the opening side in the drum;
A plurality of drive plates that engage a spline of a drive hub between the piston and the retaining plate;
A plurality of driven plates that are alternately overlapped and fitted with the plurality of drive plates and mesh with the splines of the drum;
A snap ring fixed to the drum, for preventing the drive plate and the driven plate from escaping;
A clutch device comprising a clip for preventing the retaining plate from moving in a direction away from the snap ring. The retaining plate has external teeth protruding in the outer peripheral direction,
The clip includes a holding portion that holds external teeth of the retaining plate, and a holding portion that contacts the snap ring and restricts movement of the retaining plate in the axial direction. The clutch device according to 1. The clutch device according to claim 2, wherein the holding portion is elastically deformable in an axial direction.

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