JPS609468Y2 - centrifugal clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal clutch that prevents a half-clutch condition from occurring.

A centrifugal clutch is designed to press the drive plate of the clutch hub and the driven plate of the clutch sleeve hub on the driven side through balls that are displaced in the radial direction by the centrifugal force generated by the rotation of the clutch hub on the drive side. There is something I did.

At the start of operation of such a conventional centrifugal clutch, the drive plate and the driven plate come into sliding contact, which poses a problem in that these plates are likely to wear out.

Furthermore, in such a state, the plates repeatedly slide into and out of contact with each other, which poses a problem in that a knocking phenomenon may occur in automobiles equipped with the above-mentioned centrifugal clutch.

The object of the present invention is to provide a centrifugal clutch that eliminates these problems.

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

In FIG. 1, 1 is a gear case, 2 is a drive shaft linked to an engine (not shown), 3 is an intermediate shaft provided on the same axis as the drive shaft 2, and 4 is an interposed device between the drive shaft 2 and the intermediate shaft 3. 5 is a low gear attached to the intermediate shaft 3, 6 is a high gear attached to the intermediate shaft, 7 is the intermediate shaft 3
This is a driven shaft as a rotating shaft arranged parallel to the .

A low gear 8 meshes with the low gear 6 and is supported by the driven shaft 7 via a one-way clutch 9.

Reference numeral 10 denotes a centrifugal clutch mounted on the driven shaft 7, and a high gear 12 fixed to a clutch hub 11 of the centrifugal clutch 10 meshes with the high gear 6.

In FIG. 2, a clutch sleeve hub 13 is loosely fitted into a clutch hub 11. As shown in FIG.

The clutch sleeve hub 13 is spline-fitted to the driven shaft 7.

A plurality of ring-shaped driven plates 14, 14, . . . are fixed to the outer periphery of the clutch sleeve hub 13 at regular intervals in the axial direction of the driven shaft 7.

A plurality of ring-shaped drive plates 15 are held on the inner peripheral surface of the clutch hub 11 so as to be non-rotatable in the circumferential direction and movable in the axial direction of the driven shaft 7 .

Each drive plate 15 is arranged to face each driven plate 14 and alternately therewith.

A ring-shaped carrier plate 16 is interposed between the clutch hub 11 and the clutch sleeve hub 13.

A guide protrusion 16a is provided on the outer periphery of this carrier plate 16.
are integrated.

This guide protrusion 16a fits into a long hole 11a formed in the clutch hub 11.

This long hole 11a extends in the axial direction of the driven shaft 7.

17 is a sleeve interposed between the driven shaft 7 and the carrier plate 16; 18 is a spring receiver interposed between the carrier plate 16 and the flange portion 19 of the driven shaft 7; Carrier plate 16 and clutch hub 1
1 and the disk portion 11b of No. 1.

A compression coil spring 20 is interposed between the spring receiver 18 and the carrier plate 16, and urges the carrier plate 16 toward the clutch sleeve hub 13.

The surface of the carrier plate 16 facing the clutch sleeve hub 13 has a tapered surface 21 that is inclined toward the clutch sleeve hub 13 in the radial direction of the driven shaft 7 .

A pressure plate 22 is fixed to the drive plate 15 facing this tapered surface 21.

A ball 23 is disposed between the pressure plate 22 and the tapered surface 21.

A stopper holding ring 24 is rotatably supported on the surface of the clutch sleeve hub 13 facing the pressure plate 22.

This stopper holding ring 24 has a groove 24b having a slope 24a that slopes toward the driven shaft 7 side, and a resilient stop member 25 made of rubber, synthetic resin, etc. is held in this groove 24a. has been done.

This stop member 25 projects from a hole 26 formed in the pressure plate 22 toward the ball 23 side.

The ball 23 is configured to move over the stop member 25 and be displaced in the radial direction when the centrifugal force acting on the ball 23 reaches a specified value, and this value is determined by the amount of protrusion of the stop member 25 toward the ball 23. and the spring force of the compression coil spring 20.

Next, the operation of the centrifugal clutch 10 attached to the transmission in this manner will be explained.

In FIG. 2, the portion above the center line A shows the state of the centrifugal clutch 10 when it is not in operation, and the part below the center line A shows the state when the centrifugal clutch 10 is in operation.

When the clutch hub 11 is rotated by rotational force from an engine (not shown), the carrier plate 16 rotates together with the clutch hub 11.

As a result, centrifugal force acts on the ball 23.

In FIG. 3, the centrifugal force at this time is Fl, the accompanying pressing force of the carrier plate 16 to the left is FR1, the spring force of the compression coil spring 20 is Fs, the mass of the ball 23 is m1, the driven shaft 7 The distance from the center of the ball 23 to the center of the ball 23 is γ, the resultant force of F and FR is F', the angle between F' and PR is α, and the angular velocity of the carrier plate 16 is W1
The initial length of the compression coil spring 20 is A1 ball 2
The amount of compression of the compression coil spring 20 due to the centrifugal force acting on X1 is expressed as follows:
F, FR9F, is as follows.

Fs=k (x 10A)”...
...(31 Therefore, ball 23 is Fvt = F
It is stopped by a stop member 25 until the rotational speed reaches s.

At this time, the ball 23 is in pressure contact with the stop member 25 so as not to be in pressure contact with the pressure plate 22 like the upper ball 23 in FIG. Pressure force is not applied.

When FR>F, the carrier plate 16 is displaced to the left in FIGS. 2 and 3 against the compression coil spring 20, and the ball 23 rides over the stop member 25 and moves in the radial direction. Displace.

As a result, the ball 23 is brought into pressure contact with the pressure plate 22 like the ball 23 shown in the lower part of FIG. 2, the driven plate 14 and the drive plate 15 are brought into pressure contact, and the torque of the engine is transmitted to the driven shaft 7.

When the engine speed is reduced to a low speed with the centrifugal clutch 10 in operation, the stop member 25 falls toward the slope 24a and its tip retracts into the hole 26, causing the ball 23 to be compressed. Due to the spring force of the coil spring 20 and the action of the tapered surface 21, it is displaced toward the driven shaft 7, and the pressure contact between the driven plate 14 and the drive plate 15 is released.

As explained above, the present invention is provided with a stop member that restricts the displacement of the balls in the radial direction until the centrifugal force acting on the balls reaches a specified value, so that when the centrifugal clutch starts operating, the driven plate and the drive plate It is possible to effectively prevent the occurrence of a half-clutch state where the two plates come into sliding contact with each other, and the repetition of the continuation of these two plates.

Therefore, the wear between the driven plate and the drive plate can be reduced compared to the conventional case, and the occurrence of the knocking phenomenon can be effectively prevented.

Furthermore, according to the centrifugal clutch of the present invention, by appropriately selecting the centrifugal force acting on the balls and the strength of the compression coil spring, it is possible to always set the rotational speed at which the clutch operates to be constant. Therefore, stable clutch characteristics can be obtained.

In addition, when the centrifugal clutch of the present invention is incorporated into a transmission that uses a torque converter, even if the centrifugal clutch operates suddenly, the impact force at this time is absorbed by the torque converter, resulting in good gear shifting. There are advantages to operating.

[Brief explanation of drawings]

Figure 1 is a power transmission system diagram showing an embodiment of a transmission equipped with the centrifugal clutch of the present invention, Figure 2 is a sectional view of the centrifugal clutch of the present invention, and Figure 3 is the lower part of Figure 2. FIG. 7... Driven shaft (rotating shaft), 10...
Centrifugal clutch, 11...Clutch hub, 13.
...Clutch sleeve hub, 14...Driven plate, 15...Drive plate,
16...Carrier plate, 20...
Compression coil spring, 23...Ball, 25
...stop member.

Claims (1)

[Scope of utility model registration request] A drive plate and a driven plate are disposed facing each other, and a ball is provided that rotates together with the drive plate and is displaced in the radial direction, thereby bringing the drive plate and the driven plate into displacement pressure contact, and the ball is rotated. In a centrifugal clutch with a spring biased toward the center, a hole is provided in a pressure plate that presses the ball when it is displaced by centrifugal force, and a stopper is located between the pressure plate and a drive plate or driven plate located behind the pressure plate. Forming a groove in the retaining ring with a slope inclined toward the driven shaft side, and having an elastic stop member in the groove, a part of which protrudes from the hole in the pressure plate toward the ball side, A centrifugal clutch characterized by being held in a tiltable manner.