JPH0445695B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a clutch for a vehicle, and in particular can suitably suppress rotation of the driven side portion when the clutch is disengaged in an agricultural vehicle. Regarding clutches for vehicles.

<Conventional technology> Conventionally, in agricultural vehicles such as tractors,
As a clutch device for intermittent power transmission from the engine to the power take-off shaft (hereinafter referred to as the PTO shaft) that connects the traveling gear and working equipment,
A wet multi-plate clutch is used.

This wet type multi-disc clutch is suitable as a clutch device for work vehicles that are prone to frequent intermittent and sudden operation under high loads, but it also prevents the lubricating oil adhering to the clutch plates from rotating due to viscous resistance. This is easy to cause, and as a result, there is a problem in that it interferes with gear shifting operations, and when a working machine is connected to the PTO shaft, it is difficult to stop the working machine immediately even if the clutch is disengaged.

In order to avoid such inconvenience, a braking friction plate interposed between the clutch housing and the driven shaft and a piston operated by hydraulic pressure installed in the housing are used to prevent the driven shaft from moving when the clutch is disengaged. A device for braking is disclosed in Japanese Patent Publication No. 49-30047.

<Problems to be Solved by the Invention> However, providing such a braking device separately from the clutch disconnection mechanism has the disadvantage of complicating the structure and increasing the number of parts.

In view of these disadvantages of the prior art, the main object of the present invention is to provide a vehicle clutch equipped with a braking device having a simple structure that can prevent the driven side portion from rotating when the clutch is disengaged. It is about providing.

<Means for Solving the Problems> According to the present invention, it is an object of the present invention to connect a driving member connected to an engine output transmission shaft, a driven member connected to an input shaft of a transmission, and between a driving clutch plate that is engaged to the member so as to be relatively unrotatable but movable in the axial direction, a driven clutch plate that is engaged to the driven member so as to be relatively unrotatable but movable in the axial direction, and the driven member; a pressure contact member for applying an elastic engagement force between the two clutch plates with spring means provided at the spring means; and a pressure contact member for applying an axial displacement to the pressure contact member against the spring force of the spring means. A vehicle clutch comprising a clutch disconnecting means and a braking device for applying rotational resistance to the driven member when the engagement force of the pressure contacting member is released, the braking device a brake plate connected to the pressing member via a strap material having flexibility in the axial direction on the side opposite to the pressing surface of the clutch plate; and a surface of the driven member that the pressing member presses against. provides a clutch for a vehicle, comprising a friction plate disposed coaxially with the input shaft so as to be displaceable only in the axial direction between the opposite axial end face and the brake plate. This is achieved by

<Function> In this way, when the clutch is disconnected, the friction plate, which is only allowed to be displaced in the axial direction, is pressed against the axial end face of the driven member, thereby suppressing the accompanying rotation of the driven member when the clutch is disconnected. becomes possible.

Embodiments The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

FIG. 1 is an overall view of an agricultural vehicle equipped with a wet multi-plate clutch according to the present invention. Engine 4 toward the direction
is installed. One end of a propulsion shaft 5 is connected to the rear end of the crankshaft 3, and the other end of the propulsion shaft 5 is
It is connected to an output transmission shaft 7 serving as an input shaft of a power transmission device 6 installed at the rear of the frame 2 .

The power of the engine 4 input to the output transmission shaft 7 is
It is branched by a gear device inside the power transmission device 6, and the rear wheels 9 are decelerated and driven by a final reduction gear 10 via a rear wheel differential device 8 provided at the rear of the power transmission device 6. A front wheel propulsion shaft 11 inserted into the frame 2 connects the power transmission device 6 and a front wheel differential device 12 provided at the bottom of the engine 4, and connects it to the final reduction gear 13 in the same manner as the rear wheels 9. The vehicle is decelerated to drive the front wheels 14.

Furthermore, by connecting a PTO shaft (not shown) to a submission device (not shown) provided in a hitbox 15 that is vertically swingably connected to the rear of the power transmission device 6, the hitbox 1
The rotary working machine 16 is adapted to drive an attachment device such as a rotary work machine 16, which is attached to the rotary work machine 5. The hitbox 15 can be raised and lowered by a lift device 17 provided above the power transmission device 6.

On the other hand, a handle 18 is provided in the center of the vehicle body, and a seat 19 is provided at the rear of the vehicle body, and when an operator seated on the seat 19 operates the handle 18, a steering wheel provided at the bottom of the handle 18 is installed. The front wheels 14 and rear wheels 9 can be simultaneously steered through a front wheel steering rod 21 and a rear wheel steering rod 22 connected to a gearbox 20.

FIG. 2 shows a wet multi-disc clutch device 30 built into the power transmission device 6, and the power of the engine 4 is transmitted from the output transmission shaft 7 to the wet multi-disc clutch device 30 via a sprocket 31. .

The sprocket 31 is connected to an input shaft 34 of the transmission which is pivotally supported to the transmission case 32 via a ball bearing 33.
The clutch is pivotally supported via a sliding bearing 35 so as to be relatively rotatable, and at the same time, in order to absorb the shock when the clutch is engaged, similar to the known type of single plate clutch,
It is fixed to a drive member 37 via a spring member 36.

The drive member 37 has a generally bottomed cylindrical shape with spline grooves 38 arranged in a row on its inner circumferential surface, and has a plurality of annular drive clutch plates 39 having an outer circumferential edge that meshes with the spline grooves 38. It is received so as to be displaceable along the axial direction, and the aforementioned sprocket 31 is fixed to the outer surface of the bottom portion.

Further, a driven member 40 and a press plate 41 are received inside the driving member 37 described above.

The driven member 40 has a spline groove 42 on its outer peripheral surface.
It has a generally cylindrical shape with a bottom, and is integrally fixed to the input shaft 34 by a boss 43 formed at the center of the bottom wall to be spline-fitted to the shaft end of the input shaft 34. A plurality of holes 44 are bored on the same circumference outside the boss 43 on the wall surface to receive bosses of a pressure contact plate 41, which will be described later. Further, a radially outward flange 45 having an outer diameter smaller than the inner diameter of the driving member 37 is provided around the open end of the driven member 40, and a flange 45 is provided on the peripheral wall surface according to the pitch of the spline groove 47. Slit-shaped lubricating oil passages 4 along the axial direction are provided at positions that divide the peripheral wall surface into approximately equal parts.
0a are cut alternately near the open end and near the bottom wall.

The pressure contact plate 41 is basically in the shape of a disk having approximately the same diameter as the flange 45 of the driven member 40 described above, and the boss 43 of the driven member 40 described above is inserted into a central hole 46 formed in the center. It is received between the inner surface of the bottom wall of the driving member 37 and the outer surface of the bottom wall of the driven member 40 while passing through the outer peripheral surface relatively loosely.
This pressure contact plate 41 is formed with a spline groove 47 that meshes with the spline groove 42 of the driven member 40, and a boss 48 that protrudes from a hole 44 formed in the bottom wall of the driven member 40. Due to these engagements, the driven member 40 and the pressure contact plate 41 rotate together, and are also capable of relative displacement in the axial direction.

Further, between the flange 45 of the driven member 40 and the pressure contact plate 41, there is a driven clutch plate 49 formed in an annular shape and having an inner peripheral edge that meshes with the spline groove 42. are installed alternately.

A lifter plate 50 is attached to the end face of the boss 48 of the pressure contact plate 41 protruding from the hole 44 in the bottom wall of the driven member 40, and a stud bolt 5 screwed onto the boss 48 is attached to the lifter plate 50.
1 by screwing a nut 51a. The lifter plate 50 and the driven member 40
A coil spring 52 is connected to the inner surface of the bottom wall of the boss 4.
8, and is normally placed in the direction of bringing the distance between the flange 45 of the driven member 40 and the pressure contact plate 41 closer, that is, in the direction of pressure contacting the drive clutch plate 39 and the driven clutch plate 49. A biasing force is applied.

A lifter rod 53 is pivotally supported at the center of the lifter plate 50 via a ball bearing 54 so as to be relatively rotatable. The lifter rod 53 has a flange 5 that comes into contact with the side surface of the inner race of the ball bearing 54.
5 is formed, and the thrust force toward the input shaft 34 is transmitted to the lifter plate 50 via the ball bearing 54.
It is designed so that it can be transmitted to Furthermore, the lifter rod 53 has one end connected to an axial hole 56 drilled in the center of the input shaft 34, and the other end connected to the housing 5.
A bolt 59 is inserted to form a lubricating oil passage 58 on the inner surface of the bolt 7.
They are inserted into guide holes 61 bored in an oil guide plate 60 which is screwed using an oil guide plate 60 so as to be slidable in the axial direction. , lubricating oil supplied from an oil pump (not shown),
It is adapted to be able to feed into the clutch section and the inside of the transmission. Further, a release lever 63 is in contact with the other end surface of the lifter rod 53.
In conjunction with a clutch pedal (not shown), the lifter rod 53 can be pushed in the axial direction against the biasing force of the coil spring 52.

The open end of the driven member 40 projects outward in the axial direction from the end surface of the flange 45, and the friction plate 64 is positioned so as to surround the outer periphery of the open end. This friction plate 64 has a plurality of notches 65 formed at appropriate locations on its outer circumferential edge, and engages with an axial guide rib 66 formed on the inner circumferential surface of the housing 57, thereby regulating displacement in the rotational direction. It is arranged so that it can be displaced in the axial direction.

As best shown in FIG.
A plurality of notches 67 are provided at the open end at positions that roughly divide the peripheral wall surface. A radially outward convex portion 68 corresponding to the notch 67 is formed, and the flange 45 of the driven member 40
A brake plate 69 made of a metal plate having approximately the same outer diameter as
is attached to the outer periphery of the driven member 40 after being prevented from coming off using a retaining ring 70.

A strap plate 72 made of a spring material is riveted at one end to the inner peripheral end of the convex portion 68 of the brake plate 69. Then, attach the other end of the strap plate 72 to the tip of the stud bolt 51 erected on the boss 43 of the pressure contact plate 41 with a nut 5.
By fixing them using 1b, the brake plate 69 and the pressure contact plate 41 can rotate together.

Next, the operation of the wet type multi-disc clutch device 30 constructed as described above will be explained.

The power of the engine 4 is transmitted from the sprocket 31 to the input shaft 34 via the wet multi-disc clutch device 30, but when the clutch pedal is not operated, the biasing force of the coil spring 52 causes the flange 45 of the driven member 40 to press against the plate. Since the driving clutch plate 39 and the driven clutch plate 49, which are interposed between the engine 4 and the input shaft 34, are in close contact with each other, the input shaft 34
is rotated.

From this state, when the clutch pedal (not shown) is depressed to shift the gear of the power transmission device 6 to a predetermined gear, the lifter rod 53 is pushed in by the release lever 63, resisting the biasing force of the coil spring 52. The press plate 41 integrally connected to the lifter plate 50 is moved in a direction to widen the distance from the flange 45 of the driven member 40.
As a result, the pressing force between both clutch plates 39 and 49 is released, and power transmission to the input shaft 34 is cut off.

On the other hand, lubricating oil is supplied into the wet multi-disc clutch device 30 through a lubricating oil passage 58 formed inside the housing 57 and an oil passage 62 of the lifter rod 53, and this lubricating oil is supplied to both clutch plates. 39,
It is also attached to the surface of 49. Therefore, even though the pressure contact force of the pressure contact plate 41 is released, the input shaft 34 rotates together with the driven member 40 due to the adhesive force of the lubricating oil, resulting in an inconvenience that smooth gear shifting operation is hindered.

Therefore, according to the present invention, when the clutch is disconnected, the brake plate 69 is displaced along the axial direction together with the pressure contact plate 41, and the friction plate 64 is pressed against the flange 45 of the driven member 40. .

This friction plate 64 has a slot 65 that engages with a guide rib 66 formed on the inner circumferential surface of the housing 57 to restrict displacement in the rotational direction. A braking force is generated between the drive member 45 and the end face in order to suppress rotation of the driven member 40. Furthermore, the viscous resistance of the lubricating oil adhering to both plate surfaces and the flange surface acts simultaneously, resulting in a suitable braking effect.

When the clutch is connected, the pressing force of the brake plate is released by the action of the coil spring 52 interposed between the bottom wall of the driven member 40 and the lifter plate 50. Therefore, during normal operation, friction loss due to the braking device can be kept relatively small.

Furthermore, by connecting the brake plate 69 and the pressure contact plate 41 using a strap plate 72 made of a spring material, flexibility is given to the brake plate 69 in the axial direction, and changes in stroke due to wear of the clutch plate are prevented. It becomes possible to absorb it.

In the above embodiment, only a wet type multi-disc clutch was explained, but the present invention can also obtain similar effects in a dry type clutch.

<Effects of the Invention> As described above, according to the present invention, it is possible to suppress the rotation of the clutch device with an extremely simple structure, which improves operability during gear shifting and at the same time
Since it can also brake the inertial rotation of the work equipment connected to the PTO shaft, it can have a great effect on improving usability.

Moreover, since the pressure contact plate and the brake plate are integrally displaced in the same direction, it is easy to correlate the approach and release strokes of the clutch and the contact and release strokes of the brake plate. Since the friction plate is provided, the braking force acts on the axial end face of the driven member opposite to the contact surface of the pressure contact plate, and the braking device is constructed only around the driving member and the driven member. It becomes possible to complete the In addition, by using a strap member (leaf spring) to resiliently support the brake plate, it is possible to widen the possible displacement range of the brake plate without increasing the axial dimension.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view showing the entirety of an agricultural vehicle to which the present invention is applied. FIG. 2 is a longitudinal sectional view of a wet type multi-disc clutch device according to the present invention.
FIG. 3 is a partially cutaway left side view taken along the line - in FIG. 2. DESCRIPTION OF SYMBOLS 1... Agricultural work vehicle, 2... Frame, 3... Crankshaft, 4... Engine, 5... Propulsion shaft, 6... Power transmission device, 7... Output transmission shaft, 8... Rear wheel differential device,
9... Rear wheel, 10... Final reduction gear, 11... Propulsion shaft for front wheels, 12... Differential gear for front wheels, 13... Final reduction gear, 14... Front wheels, 15... Hitachi box, 16...
Rotary work machine, 17... Lift device, 18... Handle, 19... Seat, 20... Steering gear box, 21... Front wheel steering rod, 22
... Rear wheel steering rod, 30... Wet type multi-plate clutch device, 31... Sprocket, 32... Transmission case, 33... Ball bearing, 34... Input shaft, 35... Sliding bearing, 36... Spring member, 37... Drive member , 38
... Spline groove, 39... Drive clutch plate, 40...
Driven member, 40a...Lubricating oil passage, 41...Pressure plate, 42...Spline groove, 43...Boss, 44...
hole, 45...flange, 46...center hole, 47...spline groove, 48...boss, 49...driven clutch plate,
50... Lifter plate, 51... Stud bolt,
51a, 51b...Nut, 52...Coil spring, 5
3... Lifter rod, 54... Ball bearing, 55... Flange, 56... Axial hole, 57... Housing, 58
... Lubricating oil path, 59... Bolt, 60... Oil guide plate, 61... Guide hole, 62... Oil path, 63...
Release lever, 64...friction plate, 65...notch,
66... Guide rib, 67... Notch, 68... Convex part,
69...Brake plate, 70...Retaining ring, 72...Strap plate.

Claims (1)

[Claims] 1. A driving member connected to an engine output transmission shaft; a driven member connected to an input shaft of a transmission;
a driving clutch plate that is engaged with the driving member so as to be relatively unrotatable but movable in the axial direction; a driven clutch plate that is engaged with the driven member so as to be relatively unrotatable but movable in the axial direction; a pressure contact member for applying a resilient engagement force between the two clutch plates with a spring means provided therebetween; and a pressure contact member for applying an axial displacement to the pressure contact member against the spring force of the spring means. A clutch for a vehicle, comprising a clutch disconnecting means for disengaging the pressure contact member, and a braking device for applying rotational resistance to the driven member when the engagement force by the pressure contact member is released, the braking device comprising: A braking plate connected to the pressing member through a strap material having flexibility in the axial direction on the side opposite to the pressing surface of the member against the clutch plate and the pressing member of the driven member are brought into pressure contact with each other. A clutch for a vehicle comprising a friction plate coaxially disposed with the input shaft so as to be displaceable only in the axial direction, between an axial end face opposite to the axial end face and the brake plate.