JPS62215131A - Centrifugal clutch - Google Patents

Abstract

PURPOSE:To eliminate the need of a clutch clearance adjustment requiring a complicated operation of the seam adjustment by enabling a clutch releasing mechanism to set up such clutch clearances by the use of the pressing force of its spring member, and then justifying the clutch releasing mechanism along direction of the axis. CONSTITUTION:To adjust a clutch clearance W, when a lock nut 43 is loosened, and a shaft 41 is turned clockwise to move a cam nut 42 in the direction B, a clutch releasing mechanism 50 also is moved in the direction B, and the clutch clearance W becomes narrower. In addition, when the clutch clearance W becomes zero, the rotational torque of the shaft 41 is reduced drastically. Subsequently, when the shaft 41 is turned counterclockwise to a fixed number of rotations, the product of the number of rotations and the screw pitch of an adjusting screw 44 is the travel of the clutch releasing mechanism 50, and therefore, the clutch clearance W can be set up with accuracy. And accordingly, even when a clutch plate is worn out, the clearance adjustment can be performed without dismantling the clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention mainly relates to a centrifugal clutch provided in the engine of a vehicle such as a two-wheeled motor vehicle or an eight-wheeled motor vehicle.

[Conventional technology]

Conventionally, a clutch plate and a friction plate are connected to the drive shaft side and the output shaft side, respectively, and these plates are stacked alternately in the axial direction, and the frictional force between the plates is adjusted to drive the drive shaft. There is a centrifugal clutch that transmits force to the output shaft side (see, for example, Japanese Utility Model Application No. 56-75881). In this clutch, a /11 small axial clearance of about 1 to 1 am (hereinafter referred to as clutch clearance) is set between the two plates, and by maintaining this appropriately, the engine to which the clutch is connected The number of rotations is set to a predetermined number. By doing so, the output of the engine at the time of starting is made sufficient, and driving force transmission at a rotation speed exceeding a predetermined rotation speed is prevented.

Hereinafter, a method for setting the clutch clearance will be described with reference to the drawings.

In Fig. 2, 71, 72, 78 are clutch plates, 74
74a is a friction plate, 74a is a friction member, and W is a clutch gap. A clutch housing 75 rotates together with a crankshaft (not shown), and has a large number of guide pieces 76 protruding in the radial direction. This guide piece 76 has a stepped portion 76 in its axial direction.
A is formed between a low protrusion 76b and a high protrusion 76c, and a clutch plate 71 and a clutch plate 72, 78 are slidable in the axial direction on the low protrusion 76b and high protrusion 76c, respectively. and are provided in engagement with each other in the circumferential direction.

Numeral 77 is a disc spring that axially holds the clutch plate 71 between the stepped portion 76a and the clutch plate 71. Reference numeral 78 denotes a centrifugal weight, and the centrifugal force generated by its rotation presses the clutch plate 73 toward the spring 77 to connect the clutch.

Here, the clutch clearance W is the distance between the stepped portion 76a and the centrifugal shifter 8, and the clutch plate 72.7B.

It is set based on the difference between the thickness of the friction plate 74 and the thickness of the glue member 74a.

[Problem to be Solved by the Invention J] Incidentally, the above ratio M D may vary to some extent due to machining errors of the clutch housing 75 and the like. Therefore, in the above conventional technology, both plates 71, 72, 78
．． After assembling 74, move the friction plate 74 to the left,
The clutch clearance W is measured with a feeler gauge, and on the other hand, a number of friction plates 74 with different thicknesses are stocked in advance, and by changing them, the actual value of the clutch clearance W is set within the standard value as follows: This work is called shim adjustment. ), the above-mentioned variations were addressed. Therefore, this does not require the complicated work of adjusting the shims, and the number of stocked parts for the friction plates 74 increases, resulting in poor clutch manufacturability.

Additionally, the clutch plates 71, 72, 78 wear out and change in thickness with use. For this reason, the clutch clearance W may deviate from the standard value after shipment from the factory), and the shim kdN may be required again. Moreover, the shim adjustment in this case is
It is necessary to disassemble a completely assembled clutch, adjust the shims, and then reassemble the clutch, which is extremely complicated work.

The present invention was made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a centrifugal clutch that has excellent manufacturability and allows easy adjustment of the clutch gap after shipment from the factory.

[Means for solving problems]

In order to achieve the above object, the present invention first includes a clutch plate and a friction plate connected to the drive shaft side and the output shaft side, respectively. A spring member applies a pressing force to one of the plates in the axial direction.

The centrifugal weight, which operates in response to centrifugal force due to the rotation of the drive shaft, applies a pressing force to the other plate in the axial direction at a rotation speed of Wr grass or higher, so that the two plates come into pressure contact with the drive shaft. The rotational driving force is transmitted to the output shaft side.

When the clutch disconnection operation releases the pressure contact between the two plates against the pressing force of the spring member, when the rotation speed is less than the predetermined rotation speed, the clutch disconnection mechanism releases the pressure contact between the plates against the pressing force of the spring member. (The V gap is maintained. The position adjustment means adjusts the gap between the two plates by setting the position of the clutch disconnection mechanism in the axial direction.

[Effect]

According to this invention, the clutch gap is maintained by the clutch disconnection mechanism whose axial position can be freely set by receiving and holding the pressing force of the spring member. The shift latch clearance can be adjusted by changing. Therefore, complicated shim adjustment is not necessary.

Moreover, since the axial position of the clutch disconnection mechanism can be set by the position adjusting means, there is no need to disassemble the clutch when setting this position.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a part of the power transmission system, and shows one side of the crankcase 1 of the engine. This crankcase 1 includes a crank ll1182 which is a drive shaft.
A counter shaft 8 and a power take-off shaft 4 on the output shaft side are rotatably supported in parallel with the output shaft.

On the counter shaft 8, variable speed drive gears 5A, 5B, and 5C from the first stage to the eighth stage are arranged, and a second output output gear 7 having a buffer spring 6 is fixed. On the other hand, the power take-off shaft 4 has the above-mentioned speed change;
, 5B, and 5C, respectively.
, 8B, and 8C are arranged to form a transmission including gears (not shown). The above hunger extraction 1
A kick device (not shown) is connected to the first variable speed driven gear 8A rotatably held at the right end of iii1i4.

A clutch cover 9 is attached to one side of the crankcase 1, and a centrifugal clutch C is disposed within the clutch cover 9 at an end of the crankshaft 2. This centrifugal clutch C mainly includes a clutch housing 10, clutch plates 11A, IIB, and IIC, a friction plate 12 with friction members 12a provided on both sides, a clutch hub 18, and a cylindrical portion 14 that are integrally formed. It consists of a first output extraction gear 15 rotatably fitted to the crankshaft 2, and a centrifugal weight 916 provided with an annular coil spring 16a. above r5s
The L number of seats + W and the plate 12 are in pressure contact with the clutch plates 11A, IIB, and IIC so that the crankshaft 2
The rotational driving force is transmitted to the clutch hub 18 to the output shaft side.

The clutch housing 10 is spline-coupled to the end of the crankshaft 2 at its center housing boss 17.
It has a housing side wall 18 at its outer periphery and a housing outer peripheral wall 19 at its outermost periphery.

A coil spring 16a is attached to the housing side wall 18.
A spring receiver 20, to which the clutch plate 11A is mounted, projects inside thereof, and a conical inclined cam surface 21 is formed that approaches the clutch plate 11A as it goes toward the outer periphery. The centrifugal weight 16 operates in response to the rotation of the crankshaft 2, and moves along the inclined cam surface 21 at a predetermined number of rotations or more, and the centrifugal weight 16 moves along the inclined cam surface 21 to close the two plates 11A.

A pressing force in the direction of arrow A is applied to 11B, IIC, and 12.

A large number of guide pieces 22 are protruded in the radial direction on the inner circumferential side of the housing outer circumferential wall 19, and a clutch plate 11A at the right end,
Two intermediate clutch plates itn, n and a left end clutch plate 11C are provided so as to be slidable in the axial direction of the guide piece 22 and engaged in the circumferential direction. The knob is connected to the crankshaft 2 side. 23 is a disc spring which is a spring member, and a snap ring 24 and a clutch plate 11C at the left end.
Both plates 11A, IIB, IIC are elastically installed between the clutch plate 11C and the outer side 11Ca of the clutch plate 11C.

A pressing force in the direction of arrow B is applied to 12. This arrow B
direction and the suppressing force in the direction of arrow A, both plates 11
A, IIB, IIC, and 12 are pressed together.

A release pin 25 is a component of the clutch disconnection mechanism 50 and is slidably provided within a guide boss 26 that projects between the guide pieces 22 in the clutch housing 10 . For example, eight release pins 25 are provided in the circumferential direction,
When the clutch is not operated, its axial position is freely set by rotating a screw device 40, which is an example of position adjustment means. The clutch gap W is such that the release pin 25 set in this position contacts the inner side 11Cb of the clutch plate 11C at the left end when the centrifugal weight 16 is not operating and the rotation speed is less than a predetermined number of rotations. By cutting operation,
The i-plates 11A and IIB are moved in the direction of the arrow (leftward) and press the left end clutch plate 11C in the direction of the arrow against the disc spring 28.

Release the pressure contact of 11C and 12.

The clutch hub 18 is attached to the outer periphery of the cylindrical portion 14 in the axial direction and the F direction.
A suppression flange 28 is fitted into the movable position in the 9M direction and protrudes from one end of its outer periphery, facing the polishing plate 12.

29 is a locking pawl, which is provided protrudingly on the outer periphery of the clutch hub 18;
A diaphragm 12 is provided on this locking pawl 29 so as to be slidable in the axial direction and engaged in the circumferential direction. The knob is connected to the output l1iIiI side. 80 is a pin, 2
The small diameter part is driven into the fixing hole 81 drilled in the clutch hub 18 to make it constant, and the large diameter part is inserted into the elongated hole 82 bored in the cylindrical part 14 to fix the hole. ing. The elongated hole 82 is provided so as to extend diagonally in the circumferential direction of the cylindrical portion 14, and the pin 80 can freely slide within the elongated hole 82.

The screw device 40 consists of a shaft 41, a cam nut 42, and a lock nut 48. A male adjusting screw 44 is screwed onto the shaft 41, and a cam nut 42 is screwed onto the male adjusting screw 44. This shaft 41 has a flange 45 that is connected to the clutch cover 9.
while the locking nut 4 is in contact with the male tightening threaded portion 46.
8 is screwed and fastened to the clutch cover 9, and a groove 47 is carved in the end thereof. The cam nut 42 is provided with eight inclined cam surfaces (not shown) that are inclined in the circumferential direction of the cam plate portion 48, and an engagement recess is formed by cutting out the disk-shaped cam plate portion 48. A location 49 is formed.

The clutch disconnection mechanism 50 mainly includes a cam ring 42, a steel ball 58, a cam plate 52, a moving plate 58, and a release pin 2.
It consists of 5. The operating lever 51 is rotatably mounted on a foot shaft 54 and has an engagement pin 5 that engages with the engagement recess 49.
5 is fixed.

The cam plate 52 is attached to the shaft 40 via a collar 56 so as to be freely movable in the axial direction, while being fixed in the circumferential direction by a pin 57. The cam plate 52 is formed with a cam surface (not shown) that is substantially symmetrical to the cam surface of the cam plate portion 48,
A steel ball 58 is provided between these cam surfaces and held by a retainer ring 59. As a result, the cam plate 52 moves in the direction of arrow A (leftward) due to the rotation of the cam plate portion 48 . The movable plate 5B is inserted through the shaft 41 so as to be freely rotatable and movable in the axial direction, and is also inserted into a housing tab 83 which is formed outward from the housing side wall 18 so as to rotate integrally with the clutch housing 10. do. This moving plate 5
3 contacts the release pin 25 and moves the release pin 25 in the direction of the arrow as described later.

Next, the operation of the above configuration will be explained.

First, by the rotational operating force of the kick device (not shown), the first shift driven gear 8A, the first shift drive gear 5A, the second output output gear 7, the first al force output gear 15, the cylindrical portion 14, and the sardine plate 12, clutch plate 11A.

11B, IIC, and the clutch housing 10, the crankshaft 2 rotates, and the engine starts, as is well known.

When the engine enters the operating state, the clutch housing 10 integrated with the crankshaft 2 rotates at a high speed, and when a predetermined number of rotations is reached, the centrifugal weight 16 moves along the inclined cam surface 21 to the shift latch plate by centrifugal force. Press 11A in the direction of arrow A. The shift latch is connected by this pressing force, and the rotational driving force of the crankshaft 2 is transmitted in the opposite direction to that at the time of starting, and the power take-off shaft 4 rotates.

On the other hand, when changing gears, the shift latch cutoff mechanism 50 is operated by stepping on the foot shaft 54. knob) operation lever 51
is rotated slightly, and at the same time, the engagement recess 4 of the cam nut 42
The pin 55 that engages with the cam nut 9 rotates the cam nut 42 slightly. As a result, the steel balls 58 and the retainer ring 59 rotate slightly, and the cam nut 42 engages the cam plate 5 through the copper balls 58.
2. Move the moving plate 58, release pin 25, etc. in the direction of the arrow (to the left). In addition to the movement of this release pin 25,
The left end clutch plate 11C is pressed in the direction of the arrow (leftward), and the clutch plates 11A and 11B.

The pressure contact between 11C and the SM plate 12 is released, and the speed can be changed.

Next, a method of adjusting the clutch clearance W will be explained.

When the engine is assembled, first, the Rocknando 48
, engage the driver in the groove 47, rotate the shaft 41 to the right, and move the cam nut 42 screwed onto the adjustment screw 44 in the direction of arrow B. With this movement, the clutch disconnection mechanism 50, that is, the release pin 25, the moving plate 58, the collar 56, and the cam plate 52, are pressed by the disc spring 28.
Steel ball 58, cam nut 42, etc. are in the direction of arrow B (to the right)
, and the clutch clearance W becomes smaller. When the clutch clearance W becomes 0, all the pressing force of the disc spring 28 is applied to the centrifugal weight 16, so the axial force applied to the shaft 41 becomes 0, and the torque of the driver suddenly decreases.

Thereby, the operator knows that the clutch clearance W has become zero.

Then, when the shaft 41 is rotated to the left and torque is started to be felt, the shaft 41 is rotated a predetermined number of revolutions with the point where the toe latch clearance W is 0 as a reference. This rotation speed and adjustment screw 4
The product of 4 and the thread pitch is the moving distance of the clutch disconnection mechanism 50 including the release pin 25. The clutch clearance W can be set accurately by this product.

In the above configuration, clutch plates 11A and 11B.

11C and the like may wear out when the engine is operated for a long period of time, and the thickness may become thin and the clutch clearance W may change. On the other hand, the clutch clearance W is such that the release pin 25, which can move in the axial direction, is connected to the clutch plate 11C.
It is held in place by being in contact with. Also,
The axial position of the release pin 25 is set by a screw device 40. Therefore, the clutch gap W can be adjusted by moving the release pin 25 in the axial direction by rotating the screw device 40, thereby eliminating the need for complicated shim adjustment and also eliminating the need to disassemble the clutch.

During normal operation of the engine, the centrifugal weir 16 operates, and no pressing force from the spring member is applied to the clutch disconnection mechanism 50. Therefore, this configuration does not cause any problems in terms of practical durability.

〔Effect of the invention〕

As explained above, according to the present invention, there is no need for shim adjustment, which is a complicated operation, and the number of friction plate parts in stock is reduced, resulting in good clutch manufacturability. Also, with the clutch not disassembled,
Since the clutch clearance can be adjusted, adjustment after shipment from the factory is easy.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and is a vertical cross-sectional view of a power transmission system, and FIG. 2 is a side view showing a main part of a conventional clutch in a vertical cross-sectional view. 2... Drive shaft (crankshaft), 4... Output shaft (output extraction shaft), 11A, 11B, I IC... Clutch plate, 12... Friction plate, 16... Centrifugal main shaft , 28...
- Spring member (disc spring), 40... Position adjustment means (screw fitting fi), 50... Clutch disconnection mechanism, D... Gap (clutch gap).

Claims (1)

[Claims] (1) A clutch plate connected to the drive shaft side, a friction plate connected to the output shaft side and in pressure contact with the clutch plate to transmit the rotational driving force of the drive shaft to the output shaft side, and a friction plate connected to the output shaft side. A spring member that applies a pressing force in one direction in the axial direction, and a centrifugal member that operates in response to centrifugal force due to the rotation of the drive shaft and applies a pressing force in the other axial direction to both plates at a predetermined rotation speed or more. The weight and its cut-off operation release the pressure contact between the two plates against the pressing force of the spring member, and when the rotation speed is lower than the predetermined rotation speed, the pressing force of the spring member is applied to the axial direction of the two plates. A centrifugal clutch comprising: a clutch disconnection mechanism that maintains a gap; and a position adjustment means that adjusts an axial gap between the two plates by setting the axial position of the clutch disconnection mechanism.