JP2003278796A - Multiple disc clutch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple disc clutch device wherein a dust seal is singly and easily replaced independently of an oil seal, while retaining the oil seal to withstand hydraulic pressure. <P>SOLUTION: A disc-shaped seal retainer 32 with a cylinder part 31 having a larger diameter than the outer peripheral surface of an input member 3 has its outer periphery fastened to the input shaft 2 side end of a cylinder part 6 of an output member 8 with an axially oriented bolt 33. An inward flange 34 which extends toward the outer peripheral surface of the input member 3 is provided on the intermediate portion of the inner surface of the cylinder part 31. An oil seal 28 whose inner surface is pressed into contact with the outer peripheral surface of the input member 3 is provided inside the cylinder part 31 located inward of the flange part 34. The dust seal 35 whose inner surface is pressed into contact with the outer peripheral surface of the input member 3 is provided inside the cylinder part 31 located outward of the flange part 34. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-plate clutch device, and more particularly to a support structure for a seal member thereof.

[0002]

2. Description of the Related Art Power generated by an engine is transmitted to an auger via a chain transmission so that the auger scrapes snow on the road, and the collected snow is thrown from a blower through a chute to the outside of the road. Rotary snowplows are known.

In such a rotary snow plow, when the auger bites stones or ice blocks, for example, a large torque is generated in the shaft between the chain transmission and the auger, and a large force is applied to the engine and the transmission. The clutch device is installed on the shaft between the chain transmission and the auger.If a large torque is generated on the shaft, turn off the clutch device to prevent excessive torque from being applied to the shaft. I have to.

A conventional example of such a clutch device is shown in FIG. This device is disclosed in
This is the same as the one described as a conventional example in Japanese Patent Laid-Open No. 001-241466.

This clutch device (1) is a chain transmission.
A cylindrical input member (3) is fixed to the right end surface of an input shaft (2) linked to (not shown), and the input member is attached to the left end surface of the output shaft (4) to which an auger (not shown) is fixed. The right ends of the cylindrical shaft portion (5) fitted inside (3) and the cylindrical portion (6) fitted onto the input member (3) are joined together by a disc-shaped end plate (7). The output member (8) is fixed, and a bearing member (9) consisting of a bearing and a spacer is interposed between the output member (8) and the input member (3) to form the input member (3). The output member (8) and the output member (8) can be smoothly rotated relative to each other around the same axis line facing the left and right directions,
Moreover, a retaining plate (10) is fixed to the left end surface of the output member (8).

At the right end of the space (11) formed between the right end of the input member (3) and the output member (8), an annular piston (having a J-shaped cross section) is formed. 12) is stored so that it can be moved left and right. The left end surface of the inner peripheral edge of the piston (12) is provided with a plurality of receiving holes (only two shown in the figure) (13) at equal intervals in the circumferential direction of the piston (12). The right end of the compression coil spring (14) is fitted in (13). The left end portion of the compression coil spring (14) has a plurality of receiving holes (16) provided on the right end surface of the retainer (15) which is annularly viewed from the side and is loosely fitted to the shaft portion (5) of the output member (8). ) (Only two are shown in the figure).

The retainer (15) pushes the compression coil spring (14) in the direction of compression (on the right side of the drawing) and then the stop ring.
By fitting (17) in an annular groove provided on the outer surface of the shaft (5), it is fixed to the shaft (5).

In the space (11) formed between the outer peripheral surface of the input member (3) and the cylindrical portion (6) of the output member (8), a clutch plate assembly (18) having an annular shape in a side view is formed. Is housed so as to be able to slightly move in the left-right direction while being in contact with the piston (12), and on the left side of the clutch plate assembly (18), an abutting member (19) having an annular shape in a side view. And the stop ring (20) is fitted in the annular groove formed on the inner peripheral surface of the cylindrical portion (6) on the left side of the contact member (19), thereby the clutch plate assembly ( 18) is prevented from moving to the left.

The clutch plate assembly (18) is an output member.
A plurality of clutch plates (21) that rotate together with the output member (8) by engaging with the spline-shaped guide ridges (23) formed on the inner surface of the cylindrical portion (6) of (8), and the input member ( 3) A plurality of clutch plates (22) that rotate together with the input member (3) by engaging with the spline-shaped guide ridges (24) formed on the outer peripheral surface of 3) are allowed to move in the axial direction, and alternate. It is arranged in.

This clutch device (1) is a so-called wet type clutch, and the piston (12) and the output member (from the flow passages (29) (30) formed inside the output shaft (4) and the output member (8). The oil that has flowed into the space (11) through the gap with 8) spreads over the clutch plate assembly (18). Channel (25) (26)
Is for returning the oil accumulated in the space (11) to the tank. (27) is a seal retainer that closes an annular opening between the left end surface of the cylindrical portion (06) of the output member (8) and the input member (3), and is located on the right end surface of the seal retainer (27). Oil seal on the periphery to prevent oil from leaking outside
(28) is provided.

Since pressure oil flows from the flow paths (29) (30) between the right end surface of the piston (12) and the left end surface of the end plate (7),
Push the piston (12) to the left to move the clutch plate assembly (18).
The adjacent clutch plates (21) and (22) are brought into close contact with each other to integrally rotate the output member (8) and the input member (3).

When an excessive load is applied to the output shaft (4) side,
A slip occurs between the clutch plates (21) and (22), and the difference in the number of rotations of the input shaft (2) and the output shaft (4) at that time is detected by a rotation sensor (not shown), and the value is set in advance. When the pressure exceeds the specified value, the flow path (29) is released to atmospheric pressure and the compression coil spring is released.
The urging force of (14) pushes the piston (12) to the right,
Allow the relative rotation of the adjacent clutch plates (21) (22) to disconnect the input shaft (2) and the output shaft (4),
(2) Prevents excessive torque from being generated in (4).

[0013]

In the conventional clutch device as described above, it is desirable to provide a dust seal outside the oil seal in order to prevent the oil seal from being damaged by external dust.

In order to provide such a dust seal in the conventional clutch device shown in FIG. 3, for example, the cylindrical step portion (27a) of the above-mentioned seal retainer (27) is lengthened, and the dust seal and the oil seal are provided therein. It may be possible to arrange (28) and (28) side by side in the axial direction, but since a high hydraulic pressure (for example, 0.3 MPa or more) acts on the oil seal (28), the dust seal is crushed and the sealing performance deteriorates, Durability may deteriorate.

When the dust seal is replaced, the oil seal must be removed from the seal retainer each time, and the replacement work is complicated. In particular, such work must often be performed under severe conditions in cold regions, and simplification of the replacement work is desired.

In view of the above problems of the prior art, the present invention allows the dust seal to be easily replaced independently from the oil seal and securely holds the oil seal so as to withstand the hydraulic pressure. It is an object of the present invention to provide a multi-plate clutch device that can be operated.

[0017]

According to the present invention, the above problems can be solved as follows. (1) The cylindrical portion of the output member fixed to the output shaft is concentrically fitted onto the cylindrical input member fixed to the input shaft, and the input member is integrated with the input member between the input member and the output member. A clutch assembly in which a plurality of rotating clutch plates and a plurality of clutch plates that rotate integrally with the output member are arranged alternately so as to be movable in the axial direction, and the clutch assembly is arranged in the axial direction. In a multi-plate clutch device accommodating a piston to be pressed, at the end of the cylindrical portion of the output member on the input shaft side, the outer peripheral portion of the seal retainer having a cylindrical portion having a diameter larger than the outer peripheral surface of the input member, Tightened with a bolt that faces the axial direction, the intermediate portion of the inner surface of the cylindrical portion, an inward flange portion that extends toward the outer peripheral surface of the input member is provided,
An oil seal, the inner surface of which is in pressure contact with the outer peripheral surface of the input member, is provided inside the tubular portion inside the flange portion, and a dust seal whose inner surface is in pressure contact with the outer peripheral surface of the input member is provided inside the tubular portion outside the collar portion. Set up.

(2) The cylindrical portion of the output member fixed to the output shaft is concentrically fitted onto the cylindrical input member fixed to the input shaft, and is integrated with the input member between the input member and the output member. And a plurality of clutch plates that rotate together with the output member, and a plurality of clutch plates that rotate integrally with the output member, and a clutch assembly that is alternately arranged so as to be movable in the axial direction,
In a multi-plate clutch device accommodating a piston that presses this clutch assembly in the axial direction, a cylindrical portion having a diameter larger than the outer peripheral surface of the input member is provided at an input shaft side end of the cylindrical portion of the output member. The outer periphery of the seal retainer
An input member, which is fastened with a bolt that faces the axial direction, is provided at the input shaft side end portion of the tubular portion and a tubular portion having a diameter larger than the outer peripheral surface of the input member, and the output shaft side end portion thereof. Of the dust seal retainer having a flange portion extending toward the outer peripheral surface of the seal retainer is tightened with a bolt that faces the axial direction, and the inner surface is the outer peripheral surface of the input member inside the tubular portion of the seal retainer that is inward of the flange portion. An oil seal for press contact is provided, and a dust seal whose inner surface is in pressure contact with the outer peripheral surface of the input member is provided inside the cylindrical portion of the dust seal retainer outside the flange portion.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIG. It should be noted that the same members as those of the conventional example shown in FIG. 3 are denoted by the same reference numerals and are not shown in the drawing, and detailed description thereof is omitted (the same applies to the second embodiment of the present invention shown in FIG. 2 as well. And).

In this embodiment, the input member is provided at the end of the cylindrical portion (6) of the output member (8) on the side of the input shaft (2).
Bolts (33) facing the axial direction of the outer peripheral portion of a disk-shaped seal retainer (32) having a cylindrical portion (31) having a diameter larger than the outer peripheral surface of (3).
The input member at the middle of the inner surface of the tube (31).
An inward flange portion (34) extending toward the outer peripheral surface of (3) is provided, and the inner surface is the outer peripheral surface of the input member (3) inside the tubular portion (31) inside the flange portion (34). Install an oil seal (28) that presses against
Moreover, the inner surface is the input member inside the tubular portion (31) outside the collar portion (34).
A dust seal (35) is provided which is in pressure contact with the outer peripheral surface of (3).

With this structure, the dust seal (35) can be immediately removed from the tubular portion (31) after the input member (3) is axially extracted from the output member (8), and It can be replaced with a new one and fitted into the tubular portion (31).

When it is desired to replace the oil seal (28), the bolt (33) is removed, the seal retainer (32) and the output member (8) are removed, and then the seal (32) is removed from the seal retainer (32). 28) and remove the new oil seal (2
The seal retainer (32) may be attached to the end surface of the cylindrical portion (6) of the output member (8) with the bolt (33) by attaching the seal retainer (8) in the same manner as the original state of the seal retainer (32).

FIG. 2 shows a second embodiment of the present invention.
In this example, the input shaft in the cylindrical portion (6) of the output member (8)
At the end on the (2) side, the outer peripheral portion of a disk-shaped seal retainer (37) having a short tubular portion (36) having a diameter larger than the outer peripheral surface of the input member (3) is attached to a bolt (that faces the axial direction). 33) Tighten the tube
A cylindrical portion (38) having a diameter larger than the outer peripheral surface of the input member (3) is provided at the end portion of the input shaft (2) of (36), and the end portion on the output shaft (4) side thereof is provided. (3) Collar part (3
9) and the dust seal retainer (40) having the axial direction are fastened with bolts (41), and the tubular portion (37) of the seal retainer (37) inside (right side in FIG. 2) of the collar (39). An oil seal (28) whose inner surface is in pressure contact with the outer peripheral surface of the input member (3) is provided inside the (36), and a dust seal retainer (4) located outside the collar section (39) is provided.
A dust seal (35) whose inner surface is in pressure contact with the outer peripheral surface of the input member (3) is provided in the cylindrical portion (39) of (0).

The fitting portion of the cylindrical portion (36) of the seal retainer (37) of the dust seal retainer (40) is provided with a recessed stepped portion (40a) for positioning, and the cylindrical portion (36) is fitted therein. This facilitates the positioning of the dust seal retainer (40).

With this structure, the bolt (41) is removed and the dust seal retainer (40) is replaced with the seal retainer (37).
After removing from the dust seal (35) in a suitable wide area.
Since it can be removed from the dust seal retainer (40) or replaced by a new one, the dust seal (35) can be replaced more easily than that shown in FIG.

[0026]

According to the first aspect of the present invention, the dust seal can be easily replaced independently from the oil seal, and the collar securely holds the oil seal so as to withstand the internal hydraulic pressure. In addition, it is possible to prevent the hydraulic pressure applied to the oil seal from acting on the dust seal, and to prevent the sealing performance of the dust seal from decreasing and the durability from deteriorating.

According to the second aspect of the present invention, not only the same effect as that of the first aspect of the present invention can be obtained, but the dust seal is removed from the device together with the dust seal retainer, and the dust seal is attached at another place. Since the dust seal can be removed or replaced, the dust seal replacement work can be further facilitated.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main part of a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional front view of a main part of a second embodiment of the present invention.

FIG. 3 is a vertical sectional front view of a conventional multi-plate clutch device.

[Explanation of symbols]

(1) Clutch device (2) Input shaft (3) Input member (4) Output shaft (5) Shaft (6) Cylindrical part (7) End plate (8) Output member (9) Bearing member (10) retaining plate (11) Space (12) Piston (13) Receiving hole (14) Compression coil spring (spring) (15) Retainer (16) Receiving hole (17) Stop ring (18) Clutch plate assembly (19) Contact member (20) Stop ring (21) (22) Clutch plate (23) (24) Guide ridges (25) (26) flow path (27) Seal retainer (28) Oil seal (29) (30) Channel (31) Tube (32) Seal retainer (33) Bolt (34) Tsuba (35) Dust seal (36) Tube (37) Seal retainer (38) Tube (39) Tsuba (40) Dust seal retainer (41) Bolt

Claims (2)

[Claims] 1. A cylindrical input member fixed to an input shaft,
A cylindrical portion of the output member fixed to the output shaft is concentrically fitted to the outside, and a plurality of clutch plates that rotate integrally with the input member and between the input member and the output member are integrated with the output member. A plurality of rotating clutch plates, a clutch assembly formed by alternately arranging so as to be movable in the axial direction, and a multi-plate clutch device containing a piston for pressing the clutch assembly in the axial direction, At the end of the cylindrical portion of the output member on the input shaft side, the outer peripheral portion of the seal retainer having a cylindrical portion having a diameter larger than the outer peripheral surface of the input member is fastened with a bolt oriented in the axial direction, and the inner surface of the cylindrical portion is fixed. An inward flange extending toward the outer peripheral surface of the input member is provided in the middle part of the input member, and an oil seal whose inner surface is in pressure contact with the outer peripheral surface of the input member is provided in the tubular portion inward of the flange, and Cylinder part outside the collar part A multi-plate clutch device, wherein a dust seal, the inner surface of which is in pressure contact with the outer peripheral surface of the input member, is provided therein. 2. A cylindrical input member fixed to an input shaft,
A cylindrical portion of the output member fixed to the output shaft is concentrically fitted to the outside, and a plurality of clutch plates that rotate integrally with the input member and between the input member and the output member are integrated with the output member. A plurality of rotating clutch plates, a clutch assembly formed by alternately arranging so as to be movable in the axial direction, and a multi-plate clutch device containing a piston for pressing the clutch assembly in the axial direction, At the end of the cylindrical portion of the output member on the input shaft side, the outer peripheral portion of the seal retainer having a cylindrical portion having a diameter larger than the outer peripheral surface of the input member is fastened with a bolt oriented in the axial direction, and the input of the cylindrical portion is performed. A dust seal having a cylindrical portion having a diameter larger than the outer peripheral surface of the input member at an end portion on the shaft side, and a flange portion provided at the end portion on the output shaft side and extending toward the outer peripheral surface of the input member. Orient the retainer in the axial direction. An oil seal, the inner surface of which is pressed against the outer peripheral surface of the input member, is provided inside the tubular portion of the seal retainer that is tightened with a bolt and is located inward of the collar portion.
A multi-plate clutch device characterized in that a dust seal, the inner surface of which is pressed against the outer peripheral surface of the input member, is provided in the cylindrical portion of the dust seal retainer outside the flange portion.