JPS5842663Y2 - Clutch device play adjustment mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clutch device installed in a vehicle such as an automobile or a forklift, and more particularly to a play adjustment mechanism that can automatically adjust the amount of play of a clutch to always be constant.

FIG. 1 shows a clutch device equipped with a conventional play adjustment mechanism.

In the figure, when the clutch pedal 1 is stepped on, the clutch pedal 1 rotates about the pin 1a, the clutch cable 2 is stroked to the left in the figure, and as shown in FIG. Move the adjustment nut 4 screwed onto 3b to the left.

This adjustment nut 4 is moved by a predetermined amount (extension amount) l against the preloaded spring 5, and comes into contact with the ball seat 6, and this time, the with-drawing lever 1 is rotated clockwise around the fulcrum 7a. Rotate (swing) in the direction.

The rotation of the with-draw lever 7 is transmitted to the pressure plate 9 via the bushing rod 8, whereby the rightward pressing force of the spring 10 on the pressure plate 9 is weakened.

Therefore, the crankshaft 11 is rotationally driven by an engine not shown.
The coupling between the clutch disc 13 and the flywheel 12, which are crimped to the flywheel 12 integral with the flywheel 12, is released.
The clutch is then turned off.

A drive gear 14 is spline-fitted with the clutch disc 13 and meshed with a gear 16 of the output shaft 15.

17 is a lock nut, 21 is a return spring, 22
is a stopper for the clutch pedal 1.

However, in such a conventional configuration, the clutch disc 13
When the thickness of the pressure plate 9 is reduced due to wear, the pressure plate 9 moves to the right by the thickness reduction when the clutch is on, and the with-drawing lever 7 is moved counterclockwise via the bushing rod 8. (position shown by the chain line in Figure 2).

Therefore, the ball seat 6 is at the position shown by the two-dot chain line, and the gap between the adjustment nut 4 and the ball seat 6, that is, the play, is reduced from 11 to 42, and the clutch engagement timing changes, resulting in a change in clutch operation. make sex worse.

Therefore, in the past, the screwing position of the adjustment nut 4 with respect to the cable shaft 3 was adjusted to keep the play constant, but the adjustment had to be made frequently, and the adjustment process itself was troublesome, such as using a feeler gauge. Problems such as

The present invention was devised in view of the above, and uses a lightly loaded spring to bias the adjustment nut screwed onto the cable shaft in the direction of increasing play, while using a with-drawer lever to control the stopper that restricts the increase in play of the adjustment nut. By installing the adjustment nut on the cable shaft to follow the movement of the nut, when the play decreases, the adjustment nut automatically moves in the direction of increasing the play, and the amount of movement is regulated, so that the adjustment nut always maintains a constant level. It is an object of the present invention to provide a play adjustment mechanism that can automatically ensure play.

The present invention will be explained below with reference to embodiments shown in FIGS. 3 and 4.

FIG. 3 shows the main parts of the device of the present invention, and the configuration of the other parts is the same as that in FIG. 1, and the explanation thereof will be omitted.

In the figure, 3A is a cable shaft that is integrated with a clutch cable 2 formed longer than the conventional one, 1 is a with-drawing lever that is loosely attached to this cable shaft 3A, and the loose portion has a ball seat 6. ing.

The cylindrical portion 6A of the ball seat 6 is brought into contact with a collar 18, which is a stopper loosely attached to the threaded portion 3b of the cable shaft 3A, and is pressed against the preload spring 5A, so that the ball seat 6 and the collar 18 are moved to a with-draw lever. It is designed to move following the operation of -1.

19 is a seat nut that restrains the other end of this spring 5A, and is screwed into the threaded portion 3b of the cable shaft 3A.
It is locked with a lock nut 11.

Note that the collar 18 may be formed integrally with the ball seat 6.

Furthermore, 4 is an adjustment nut screwed onto the threaded portion 3b of the cable shirt 1-3A between the ball seat 6 and the collar 18. It is urged to the right and abuts against the inner surface of the collar 18, which is a stopper.

In this state, the gap size 13 between the opposing surfaces of the ball seat 6 and the adjustment nut 4 is set to a predetermined play size.

According to this configuration, when the cable shaft 3A is moved to the left by depressing the clutch pedal 1, the adjustment nut 4 is moved to the left together with the cable shaft 3A, and after moving by an amount corresponding to the play, comes into contact with the ball seat 6 and withdraws. The lever 7 is actuated, and the clutch disc 13 and flywheel 12 are then disengaged and the clutch is turned off in the same manner as described above.

It goes without saying that the state is restored by releasing the pedal.

When the clutch disc 13 wears out and the with-drawing lever I moves to the right with respect to the cable shaft 3A as shown in FIG. 13 to 1
Reduce to 4.

However, since the collar 18 also moves to the right together with the ball seat 6 at this time, a gap 15 corresponding to the reduced play is created between the adjustment nut 4 and the collar 18.

However, the adjustment nut 4
Due to the rightward urging force of the adjustment nut 4 and the vibration of the vehicle body, the cable shaft 3A rotates along the spiral of the threaded portion 3b, and moves to the right until it is regulated by the collar 18.

As a result, the ball seat 6, collar 18, and adjustment nut 4 are again in the relationship shown in FIG.
Gap (play) between ball seat 6 and adjustment nut 4
is returned to its initial value of 13 to keep the play constant.

FIG. 5 shows another embodiment of the present invention, in which a ring-shaped plate 21 shown in FIG. 6 is sandwiched and attached between the end of the cylindrical portion 6A of the ball seat 6 and the collar 18. This ring-shaped plate 21 is designed to act as a stopper for the adjustment nut 4, and the inner peripheral portion of the ring-shaped plate 21 is cut and raised at three places to form a spring portion 21A.

The spring constant of this spring portion 21A is the spring constant of the light load spring 2.
Position the adjustment nut 4 by raising it higher than 0.
It works as below.

When the clutch pedal 1 is depressed, the adjustment nut 4 is rotated by the thrust force generated by contact with the ball seat 6 and moves in the direction of increasing play, that is, to the right in FIG. When the clutch pedal 1 is released, the adjustment nut 4 will be pressed against the spring portion 2.
1A, and then the spring portion 21A rotates the adjustment nut 4 while being pushed by the increased amount of play, and functions to reduce the amount of play that has increased due to the thrust force, and by repeating this, the adjustment is performed. Adjust the nut 4 to return it to the specified position.

As is clear from the above explanation, the play adjustment mechanism of the clutch device of the present invention biases the adjustment nut screwed onto the cable shaft in the direction of increasing play using a lightly loaded spring, while regulating the increase in play of the adjustment nut. The stopper is loosely fitted onto the cable shaft so that it follows the movement of the with draw lever, so if the clutch disc wears and the amount of clutch play decreases,
Since the adjustment nut can automatically move and keep the amount of play constant, play adjustment work is not necessary and the characteristics of the clutch can always be maintained stably, which is a practical advantage.

[Brief explanation of drawings]

FIG. 1 is a schematic overall view of a conventional clutch device, FIG. 2 is a sectional view of a conventional play adjustment mechanism, FIG. 3 is a sectional view of the play adjustment mechanism of the present invention, and FIG. 4 is an explanatory diagram of its operation. FIG. 5 is a front view including a partial cross section showing another embodiment of the present invention, and FIG. 6 is a side view of a ring-shaped plate used in the embodiment of FIG. 1...Clutch belt, 3...Cable shaft, 4...Adjust nut, 6...
... Ball seat, 7 ... With drawer lever, 9 ... Pressure plate, 12 ...
... Flywheel, 13 ... Clutch disc, 18 ... Collar, 20 ... Light load spring, 21 ... Ring-shaped plate.

Claims (1)

[Scope of utility model registration request] A threaded portion is formed at the end of the cable shaft operated by the clutch pedal, a with-drawing lever is loosely fitted into the threaded portion, and an adjustment nut and a stopper for regulating the movement of the adjustment nut are provided. Place a spring between the and adjustment nut,
In the clutch device, when the clutch pedal is depressed, the with-draw lever is actuated via an adjustment nut to release the coupling between the clutch disc and the flywheel, and the stopper is configured to actuate the with-draw lever via an adjustment nut to release the connection between the clutch disc and the flywheel. A play adjustment mechanism for a clutch device, characterized in that the mechanism follows the movement.