JPS62118121A - Clutch for vehicle - Google Patents

Abstract

PURPOSE:To prevent the accompanying rotation of a driven member upon disconnection of a clutch by pressing a frictional board allowable only of an axial displacement against the axial endface of the driven member upon disconnecting operation of clutch. CONSTITUTION:Upon disconnecting operation of a clutch, a brakeboard 69 will displace together with a pressure contacting board 41 along the axial direction and press a frictional board 64 against a frange 45 of a driven member 40. The frictional board 64 is limited of displacement in the rotary direction through engagement of a slot 65 with a guide rib 66 formed in the innercircumferential face of the housing 57. Consequently, brake force for preventing accompanying rotation of the brakeboard 69 and the driven board 40 can be produced.

Description

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

<Prior art> Conventionally, in agricultural vehicles such as tractors, a clutch device is used to connect and disconnect power transmission from an engine to a power take-off shaft (hereinafter referred to as a PTO shaft) that connects a traveling device and working equipment. A wet multi-disc clutch is used.

This wet type multi-disc clutch is suitable as a clutch device for work vehicles that are subject to frequent intermittent and sudden operation under high loads, but on the other hand, it is difficult to carry around due to the viscous resistance of lubricating oil adhering to the clutch discs. This is easy to cause, and as a result, there are problems 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. The device to brake the
It is disclosed in the No. 0047 publication.

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

In view of such 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, a clutch plate interposed between the two members to engage with each other; a clutch disconnection means for releasing the engagement against the pressure contact means; A vehicle clutch comprising a braking device provided to stop rotation of the driven member, the friction device being disposed coaxially with the input shaft and displaceable only in an axial direction. This is achieved by providing a vehicle clutch characterized by having a plate and a pressing means for pressing the friction plate against the axial end face of the driven member.

<Operation> With this arrangement, when the clutch is disengaged, 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 disengaged. 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-disc clutch according to the present invention. An engine 4 is mounted facing in the front-rear direction. 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 connected to an output transmission shaft 7 as an input shaft of a power transmission device 6 installed at the rear of the frame 2. has been done.

The power of the engine 4 input to the output transmission shaft 7 is branched by a gear device inside the power transmission device 6, and is transmitted to the rear wheels 9 via a rear wheel differential device 8 provided at the rear of the power transmission device 6. is decelerated and driven by the final reduction gear 10, and
The front wheel propulsion shaft 11 inserted into the frame 2 connects the power transmission device 6 and the front wheel differential device 1 provided below the engine 4.
2 are connected to each other, and similarly to the rear wheels 9, the final reduction gear 13 decelerates the speed and drives the front wheels 14.

Furthermore, by connecting a PTO shaft (not shown) to a submission device (not shown) provided in a pitch box 15 that is vertically swingably connected to the rear of the power transmission device 6, the pitch box 15 It is configured to be able to drive an attachment device, such as a rotary work machine 16, attached to the rotary work machine 16, for example. Note that the switch box 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. gearbox 2
The front wheel 14 and the rear wheel 9 are connected to each other via the front wheel steering rod 21 and the rear wheel steering rod 22 connected to the
This allows both to be steered at the same time.

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

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 sprocket 31 described above is fixed to the outer surface of the bottom.

Further, inside the driving member 37 described above, a driven member 4 is provided.
0 and a pressure contact plate 41 are received.

The driven member 40 has a generally bottomed cylindrical shape with spline grooves 42 arranged in rows on its outer peripheral surface, and has a boss 43 formed at the center of the bottom wall to be spline-fitted to the shaft end of the input shaft 34.
It is integrally fixed to the input shaft 34, and the boss 4 on the bottom wall
A plurality of holes 44 are bored on the same circumference on the outside of 3 to receive bosses of a pressure contact plate 41, which will be described later. Further, near the open end of the driven member 40, a radially outward flange 4 having an outer diameter smaller than the inner diameter of the driving member 37 is provided.
5 is provided around the circumference, and slit-shaped lubricating oil passages 4Oa along the axial direction are provided on the circumferential wall surface at positions that divide the circumferential wall surface approximately equally according to the pitch of the spline grooves 47, near the open end and near the bottom wall. They are cut out alternately.

The press plate 41 basically has a disc shape with approximately the same diameter as the flange 45 of the driven member 40 described above, and the boss 4 of the driven member 40 described above is inserted into the center hole 46 opened 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 relatively loosely passing through the outer peripheral surface of the drive member 37 . This pressure contact plate 41 has 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.
Through their engagement, the driven member 40 and the press 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 provided a temporary driven clutch 49 which has an inner peripheral edge that meshes with the spline groove 42 and is formed in an annular shape. are installed alternately.

Pressing plate 41 protrudes from hole 44 in the bottom wall of driven member 40
A lifter plate 50 is attached to the end face of the boss 48.
It is fixed by screwing a nut 51a onto a stud bolt 51 screwed into 8. The lifter plate 5
A coil spring 52 is sandwiched between the flange 45 of the driven member 40 and the inner surface of the bottom wall of the driven member 40 so as to surround the boss 48. A biasing force is applied in the direction of bringing the driving clutch plate 39 and the driven clutch plate 49 closer together, that is, in the direction of pressing the driving clutch plate 39 and the driven clutch plate 49 together.

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 is formed with a flange 55 that comes into contact with the side surface of the inner race of the ball bearing 54, so that the thrust force directed toward the input shaft 34 can be transmitted to the lifter plate 50 via the ball bearing 54. ing. Furthermore, the lifter rod 53 has one end screwed into an axial hole 56 drilled in the center of the input shaft 34 and the other end screwed into the inner surface of the housing 57 using a bolt 59 to form a lubricating oil passage 5B. The oil passages 62 are inserted into guide holes 61 bored in the oil guide plate 60 so as to be slidable in the axial direction, and are formed at the center of the lifter rod 53.
Lubricating oil supplied from an oil pump (not shown) can be fed into the clutch section and the inside of the transmission through the clutch. Further, a release lever 63 is in contact with the end surface of the other end of the lifter rod 53, and 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. It is being done.

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 positions on its outer circumferential edge, and engages with an axial guide rear 66 formed on the inner circumferential surface of the housing 57 to restrict rotational displacement. It is arranged so that it can be displaced in the axial direction.

As clearly shown in FIG. 3, the open end of the driven member 40 is provided with a plurality of notches 67 at positions that approximately divide the peripheral wall surface. A convex portion 68 extending outward in the radial direction corresponding to the notch 67 is formed, and six braking plates made of metal plates having approximately the same outer diameter as the seven flange 45 of the driven member 4Q are attached to the retaining ring. 70 to prevent handling, and then attached to the outer periphery of the driven member 40.

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, the other end of the strap plate 72 is connected to a stud bolt 5 erected on the boss 43 of the press plate 4.
By tightening the nut 51b at the tip of 1,
The brake plate 69 and the pressure contact plate 41 are configured to be able to rotate together.

Next, the wet multi-disc clutch device 30 configured as described above
The operation of this 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. Drive clutch plate 39 and driven clutch plate 4 sandwiched between
9 are in close contact with each other, the input shaft 34 is rotated together with the engine 4.

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. Lifter plate 5
The pressure contact plate 41 integrally connected to the driven member 40
is moved in a direction to widen the distance from the flange 45. As a result, the pressing force between the three temporary latches 49 is released, and power transmission to the input shaft 34 is cut off.

On the other hand, a lubricating oil passage 58 formed inside the housing 57
, and the oil passage 62 of the lifter rod 53, lubricating oil is fed into the wet multi-disc clutch device 30, and this lubricating oil also adheres to the surfaces of both clutch plates 39, 49. Therefore, even though the pressure contact force of the pressure contact plate 41 is released, the input shaft 3 along with the driven member 40 due to the adhesive force of the lubricating oil.
4, which causes the inconvenience of interfering with smooth gear shifting operation.

Therefore, according to the present invention, when a clutch disengagement operation is performed,
The brake plate 69 is displaced along the axial direction together with the pressure contact plate 41 to press the friction plate 64 against the seventh 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.
9 and the end of the flange 45 of the driven member 40, a braking force is generated to suppress the 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,
By giving the brake plate 69 flexibility in the axial direction, it becomes possible to absorb changes in stroke due to wear of the clutch plate.

In the above embodiment, only a wet type multi-disc clutch has been described, 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 co-rotation of the clutch device with an extremely simple structure, thereby improving operability during gear shifting and at the same time improving the operability of the work equipment connected to the PTO shaft. Since it can also brake inertial rotation, it can have a great effect on improving usability.

[Brief explanation of drawings]

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 multi-plate crudging device according to the present invention. FIG. 3 is a partially cutaway left side view taken along the line ■--■ in FIG. 2. 1...Agricultural 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...Front wheel propulsion shaft 12...
Front wheel differential device 13...Final reduction gear 14...Front wheel 15...Pitch box 16...Rotary working 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-disc 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 4
0... 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 bolts 51a, 51'o...
・Nut 52...Coil spring 53...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 passage 63... Release lever 64... Cooling plate 65... Notch
66... Guide sword blower... Notch part 68
... Convex portion 69 ... Braking plate 70 ... Retaining ring 72 ... Strap plate Patent Applicant: Honda Motor Co., Ltd. Representative Patent attorney: Yo Oshima - Figure 2

Claims (2)

[Claims] (1) A driving member connected to an engine output transmission shaft, a driven member connected to an input shaft of a transmission, and a clutch plate interposed between the two members so as to be engaged with each other by pressure contact means; A vehicle comprising: a clutch disconnection means for releasing the engagement against the pressure contact means; and a braking device provided to stop rotation of the driven member when power transmission between the two members is interrupted. A clutch for use in a vehicle, wherein the braking device includes a friction plate disposed coaxially with the input shaft and displaceable only in the axial direction, and a pressing force for pressing the friction plate against an axial end surface of the driven member. A vehicle clutch characterized by having means. (2) For a vehicle according to claim 1, wherein the pressing means comprises a brake plate connected to the pressing means via a strap material having flexibility in the axial direction. clutch.