JPH07238955A - Clutch disc wear detector - Google Patents

Abstract

PURPOSE:To eliminate a necessity of setting for detecting wear of transmission case per type and improve reliability. CONSTITUTION:It is a device which detects wear of a clutch disc of a clutch device in which a clutch clearance fixing device which fixes play amount of a clutch is provided in a slave cylinder 1, and it is provided with a proximity switch 50 and a wear alarm lamp 51. The proximity switch 50 is provided in the slave cylinder 1 and detects projection amount of a second push rod 30 of the slave cylinder 1 from a cylinder case 20. The wear alarm lamp 51 is lit when the proximity switch 50 is turned on in the condition in which a clutch is connected and outputs wear of the clutch disc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to wear detectors, and more particularly to
The present invention relates to a clutch disc wear detecting device for detecting wear of a clutch disc of a clutch device in which a clutch clearance stabilizing device is provided in a slave cylinder.

[0002]

2. Description of the Related Art For example, an automobile is provided with a clutch device for transmitting and disconnecting power between an engine and a transmission. This clutch device
Generally, a clutch main body provided on the input side of a transmission and a clutch release mechanism for operating a diaphragm spring of the clutch main body are provided.
The clutch release mechanism consists of a master cylinder connected to the clutch pedal, a slave cylinder connected to the master cylinder, a release yoke operated by the slave cylinder, and a release spring at the tip of the release yoke, spaced apart from the diaphragm spring. It has a bearing. A clutch clearance stabilizing device is provided in the slave cylinder so that the distance between the release bearing and the diaphragm spring, that is, the clutch play amount is always constant.

In a slave cylinder provided with a clutch clearance stabilizing device, when the clutch disc wears, the push rod of the slave cylinder also retracts accordingly. Therefore, it is conventionally used to detect the wear of the clutch disc. Has been done. This clutch disc wear detection device has a hook arranged at the tip of the push rod and a gap sensor attached to the transmission case, and detects the wear of the clutch disc by detecting the gap between the gap sensor and the hook. However, when the wear reaches a predetermined amount, for example, a wear warning lamp arranged in the meter panel is turned on.

[0004]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since the gap sensor is attached to the transmission case and the hook is attached to the push rod of the slave cylinder, the operation of the gap sensor becomes unstable due to the vibration of the transmission case, and there is a problem in that a malfunction is likely to occur. Further, since the transmission case is different for each type of engine, the gap is changed for each type, and it is necessary to redo the setting for wear detection.

An object of the present invention is to eliminate the setting for wear detection for each type of transmission case and to improve reliability.

[0006]

A clutch disc wear detector according to the present invention comprises a slave cylinder for operating a clutch, which has a cylinder and a push rod provided in a cylinder case so as to be able to move forward and backward, and a slave cylinder. Is a clutch disc wear detecting device of a clutch device having a clutch clearance fixing device for keeping the clutch play amount constant, and includes a protrusion amount detecting means and a wear signal outputting means.

The protrusion amount detecting means is provided in the slave cylinder and detects the protrusion amount of the push rod of the slave cylinder from the cylinder case. The wear signal output means outputs a wear signal of the clutch disc based on the detection result of the protrusion amount detection means in the clutch connected state. The protrusion amount detecting means is preferably attached to the tip of the push rod. Further, it is preferable that the protrusion amount detecting means is a proximity switch. Furthermore, it is preferable that the wear output means is a wear warning lamp that lights up when the proximity switch is turned on.

[0008]

In the clutch disc wear detecting device according to the present invention, the protrusion amount detecting means provided in the slave cylinder is
Detect the amount of protrusion of the push rod from the cylinder case. The protrusion amount of the push rod changes depending on the wear of the clutch disc when the clutch is engaged. For example, as the clutch disc wears, the amount of protrusion decreases. Therefore, the wear output means outputs the wear signal of the clutch disc depending on the protrusion amount when the clutch is engaged.

Here, since the protrusion amount detecting means is provided not in the transmission case but in the slave cylinder, the setting for wear detection can be performed without depending on the type of the transmission case. Further, since the detected side and the detecting means are attached to the same slave cylinder, the operation is stable. Therefore, reliability is improved.

When the protrusion amount detecting means is attached to the tip of the push rod, it is easy to detect the protrusion amount. Further, when the protrusion amount detecting means is a proximity switch, reliability is further improved. Further, when the wear output means is a wear warning lamp that lights up when the proximity switch is turned on, the configuration thereof becomes simple.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a clutch operating mechanism adopting an embodiment of the present invention has a slave cylinder 1 having a clutch clearance stabilizing device. The slave cylinder 1 is connected to the master cylinder 3 by a pipe 2. A piston 4 in the master cylinder 3 is connected to a clutch pedal 7 via a rod 5 and a pin 6. The clutch pedal 7 is rotatably supported by the vehicle body via a pin 8.

A lower end of a release yoke 13 rotatably supported by a fixed fulcrum 12 is connected to a tip of the slave cylinder 1 by a pin 11. Release yoke 13
A release bearing 14 is rotatably connected to the upper part of the via a pin. This release bearing 14
A diaphragm spring 15 of a clutch main body (not shown) is arranged at a distance l ₁ (clutch play amount). Further, at the lower end of the release yoke 13, the release yoke 13 is rotated clockwise (retraction side of the slave cylinder 1).
A return spring 16 for urging the valve is attached.

As shown in FIG. 2, the slave cylinder 1 has a bottomed cylindrical cylinder case 20 having an open end.
And a piston 21 slidably fitted in the cylinder case 20. A U packing 22 is attached to the retracted side of the piston 21 to liquid-tightly seal a space surrounded by the cylinder case 20 and the piston 21. Pipe 2 from master cylinder 3 to this space
Pressure oil is supplied via the. A recess 21a is formed on the advancing side of the piston 21. The base end of the first push rod 23 is in contact with the recess 21a. The first push rod 23 includes a contact portion 24 that contacts the piston 21,
A large diameter portion 25 that extends horizontally from the contact portion 24, and a large diameter portion 25
It has a small-diameter portion 26 having a reduced diameter and a taper portion 27. The tapered portion 27 includes a first inclined surface 27a that gradually reduces in diameter from the small diameter portion 26 and a horizontal portion 27 that extends horizontally from the first inclined surface 27a.
b and the second inclined surface 27c that gradually expands in diameter toward the tip side
And have. A second push rod 30 is slidably fitted on the outer peripheral surface of the small diameter portion 26. The second push rod 30 is the small diameter portion 2 of the first push rod 23.
6 has a cylindrical portion 31 fitted in the upper portion and a shaft portion 32 extending from the tip of the cylindrical portion 31 toward the advancing side. A screw 33 is formed at the tip of the shaft portion 32. A clevis 44 is screwed into the screw 33, and the length of the second push rod 30 can be adjusted by adjusting the screwing amount of the clevis 44.

A sleeve 34 is fitted on the outer peripheral surface of the second push rod 30. On the inner peripheral surface of the sleeve 34, axially long guide grooves 35 are formed at three locations at equal intervals in the circumferential direction. A cylindrical holder plate 36 is arranged between the sleeve 34 and the cylinder case 20. A spring 37 is arranged in a compressed state between the holder plate 36 and the sleeve 34.
In addition, the first push rod 23 and the second push rod 3
A spring 38 is arranged between 0 and 0 in a compressed state. A spring receiver 39 is fixed to the tip of the shaft portion 32 of the second push rod 30. A spring 40 is arranged in a compressed state between the spring receiver 39 and the tip of the sleeve 34. The three springs 37, 40, 3
The spring force of 8 is set strong in this order. Further, the spring 38 is set stronger than the return spring 16.

Lock balls 41 are fitted at three circumferential positions facing the guide groove 35 of the cylindrical portion 31 of the second push rod 30. The lock ball 41 is for locking the first push rod 23, the second push rod 30, and the sleeve 34 so that they can be integrally operated. The lock ball 41 is formed by the second inclined surface 27c of the first push rod 23 and the guide groove 3 of the sleeve 34.
It is fitted between the inner peripheral surface of 5 and the inner peripheral surface of 5 to lock these three members. A snap ring 42 for restricting movement is fitted to the large diameter portion 25 of the first push rod 23 so as to prevent the lock ball 41 from falling off. The snap ring 42 allows the first push rod 23 to move with respect to the sleeve 34 by a distance l ₄ . Further, at the base end of the sleeve 34, a snap ring 43 for restricting the stroke of the sleeve 34 is fitted. With this snap ring 43, the sleeve 34
Is movable with respect to the holder plate 36 by a distance l ₂ . This interval l ₂ is defined in relation to the clutch play amount l ₁ . In addition, the first push rod 23 and the second
The push rod 30 may leave spacing l ₃ by the action of the spring 38 and the lock ball 41 and the second inclined plane 27c.

The spring receiver 39 has a second push rod 3
A proximity switch 50 for detecting a protrusion amount of 0 is arranged toward the end surface of the sleeve 34. Proximity switch 5
0 is connected to a wear warning lamp 51, which is arranged, for example, in the meter panel of the automobile. Here, the amount of protrusion of the second push rod 30 decreases according to the amount of wear of the clutch disc. Here, when the clearance between the sleeve 34 and the tip of the sleeve 34 is reduced when the clutch disc is worn, the proximity switch 50 is turned on, and the proximity switch 50 is turned on.
The wear warning lamp 51 connected to is turned on.

Incidentally, the spring receiver 39 and the cylinder case 20.
Boots 9 are provided between and the proximity switch 5
The tip of the slave cylinder 1 including 0 is protected.
Next, the operation of the clutch operating mechanism will be described. When releasing the clutch, the driver depresses the pedal 7. When the pedal 7 is depressed, the hydraulic pressure of the master cylinder 3 acts on the piston 21 in the slave cylinder 1,
The piston 21 moves to the right in FIG. At this time, since the compression spring 38 is stronger than the return spring 16,
The first push rod 23 and the second push rod 30 are opened by the interval l ₃ , and the lock ball 41 keeps the first push rod 23, the second push rod 30, and the sleeve 34 locked, and they are returned to the return spring 16. It slides to the right integrally by a distance l ₂ against the urging force of. Here, the three members 23,30,34 slides by a distance l _2, distance l ₂ such that the clutch play amount l ₁ becomes "0" is set. Three members 23,
The release bearing 14 abuts the return spring 15 when the distances 30 and 34 move by the distance l ₂ . When a load is applied from the clutch body side, the compression spring 3
8 also bends under the load, and the first push rod 23
It moves to the push rod 30 side, and the lock by the lock ball 41 is released. At this time, the first push rod 23 moves by the interval l ₃ . First push rod 2
When 3 moves by the distance l _3, it abuts on the base end of the second push rod 30, and both push rods 23, 30 move to the right in FIG. However, the second push rod 23 moves only by the distance l ₄ due to the snap ring 44. This is to prevent the lock ball 41 from falling off the sleeve 34.

On the other hand, when the clutch is engaged, the push rods 23 and 30 move to the left in FIG. 2 with the lock ball 41 released, and the release bearing 14 is compressed just before it is separated from the return spring 15. The spring 38 repels and slides only the first push rod 23 leftward by a distance l ₃ . As a result, the sleeve 34 and both push rods 23, 30 are locked by the lock ball 41, and they are integrated. Then, the return spring 16 continues to act and the interval l ₂
And a predetermined clutch play amount l ₁ is generated between the release bearing 14 and the diaphragm spring 15.

When the diaphragm spring 15 becomes less inclined due to wear of the clutch disc, the engagement position of the lock ball 41 with the sleeve 34 when the clutch is engaged moves to the left in FIG. As a result, the protrusion amount of the second push rod 30 is reduced. When the proximity switch 50 detects the tip of the sleeve 34 due to the reduced protrusion amount, the proximity switch 50 is turned on and the wear warning lamp 5
1 lights up. This informs the driver of wear of the clutch disc.

Since this proximity switch 50 is attached to the spring receiver 39 of the sleeve cylinder 1, even if the sleeve cylinder 1 vibrates, it vibrates similarly and the sleeve 34
Detection is stable. As a result, reliability is improved. Further, since they are attached to the same member, it is not necessary to change the setting for wear detection depending on the type of vehicle and the type of transmission.

Further, since the proximity switch 50 is arranged in the boot 9, it is less affected by the surrounding environment and the weather resistance is improved. Further, the structure is compact and the cost can be reduced. Further, since the proximity switch 50 is built in the slave cylinder 1, the mounting is easy. [Other Embodiments] (a) Instead of attaching the proximity switch 50 to the spring receiver 39, a proximity switch may be attached to the sleeve 34 to detect the spring receiver 39. (B) Instead of the proximity switch, another sensor such as a limit switch or an ultrasonic sensor may be used. (C) Instead of the wear indicator light, an alarm sound or alarm sound may be output.

[0022]

In the clutch disc wear detecting device according to the present invention, since the protrusion amount detecting means is provided not in the transmission case but in the slave cylinder, the setting for wear detection can be made independently of the type of the transmission case. You can do it. Further, since the detected side and the detecting means are attached to the same slave cylinder, the operation is stable. Therefore, reliability is improved.

When the protrusion amount detecting means is attached to the tip of the push rod, the protrusion amount can be easily detected. Further, when the protrusion amount detecting means is a proximity switch, reliability is further improved. Also, the wear output means
In the case of the wear warning light that lights up when the proximity switch is turned on, the structure is simplified.

[Brief description of drawings]

FIG. 1 is a schematic side view of a clutch operating mechanism that employs an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the slave cylinder.

[Explanation of symbols]

1 Slave cylinder 30 2nd push rod 50 Proximity switch 51 Wear warning light l ₁ Clutch play amount

Claims (4)

[Claims] 1. A slave cylinder having a cylinder case and a push rod provided in the cylinder case so as to be capable of advancing and retracting for performing a clutch operation, and a slave cylinder provided in the slave cylinder for making a clutch play amount constant. A clutch disc wear detecting device for a clutch device having a clutch clearance stabilizing device, comprising: a protrusion amount detecting means provided in the slave cylinder for detecting an amount of protrusion of the push rod from a cylinder case; A clutch disc wear detection device comprising: a wear signal output unit that outputs a wear signal for the clutch disc based on a detection result of the protrusion amount detection unit. 2. The clutch disc wear detection device according to claim 1, wherein the protrusion amount detection means is attached to the tip of the push rod. 3. The clutch disc wear detecting device according to claim 1, wherein the protrusion amount detecting means comprises a proximity switch whose state changes when the protrusion amount becomes equal to or less than a predetermined amount. 4. The clutch disc wear detection device according to claim 3, wherein the wear output means is a wear warning lamp that lights up when the proximity switch is turned on.