JPH03288030A - Clutch wear detector - Google Patents

Abstract

PURPOSE:To reduce the number of parts of a drive circuit for an alarm and simplify the configuration thereof by connecting, to the drive circuit for the alarm in series, a switch which closes by the induced voltage of a detecting coil acting with the connection/disconnection of a magnetic substance and a switch which closes when a clutch petal is released. CONSTITUTION:A release bearing 30 is rotated by the frictional contact of the tip of a release lever 7 with the release bearing 30 when the clutch facing has reached the wearing limit by providing a gap forehand between the release lever 7 and the bearing 30 so that the two may come into contact when the facing reaches the wear limit. Then a switch 55 closes and an alarm 57 actuates by the induced voltage generated in a detecting coil 37 when a magnetic substance 36a supported by the release bearing 30 connects or disconnects with the detecting coil 37.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting wear of a facing from the operating state of a release lever and a release bearing.

[Prior Art] A clutch wear detection device disclosed in Japanese Patent Application Laid-Open No. 58-163828 uses a rotation speed sensor disposed facing the outer periphery of a flywheel in the Wt zone, and a gear on a transmission input shaft. Electronically controls the signal from the rotation speed sensor placed opposite the
The difference in rotational speed between the flywheel and the gear is compared, and when the difference between the two exceeds a predetermined value, an alarm is activated.

The above-mentioned IN requires two rotational speed sensors to detect the rotational speed of the input shaft and the rotational speed of the transmission input shaft, and an electronic IIJA device that calculates the difference between the two, resulting in a large number of parts and a complicated control circuit configuration. There are problems such as complexity and high cost.

[Problems to be Solved by the Invention] In view of the above-mentioned problems, the purpose of the present invention is to reduce the number of parts,
An object of the present invention is to provide a clutch wear detection device having a simple configuration.

E@Means for Solving Problems] In order to achieve the above object, the present invention has a configuration in which a detection coil is disposed on a shift block that is pushed by a clutch lever, and a detection coil is disposed on a shift block that is pushed by a clutch lever, and a release lever is pushed by the shift block. A magnetic body is supported on the outer circumferential wall of the release bearing that rotates the clutch in the clutch disengagement direction, and a switch that closes by the induced voltage of the detection coil when the magnetic body comes into contact with and separates from the clutch pedal and a switch that closes when the clutch pedal is released are used to drive the alarm. It is connected in series to the circuit.

[Operation] A predetermined gap is provided between the release wheel holder and the release lever. When the clutch is connected, the pressing plate moves toward the flywheel and presses the facing against the flywheel, and as a result, the end of the release lever for separating the pressing plate from the flywheel approaches the release bearing.

Therefore, if a gap is set in advance so that the tip of the release lever will come into contact with the bearing when the facing reaches its wear limit, then when the facing reaches its wear limit, the end of the release lever will make contact with the release bearing. The release bearing is rotated.

At this time, the magnetic body supported by the release bearing moves toward and away from the detection coil, and the induced voltage generated in the detection coil closes the switch and activates the alarm.

[Embodiment of the Invention] As shown in FIG. 1, a vehicle clutch has a spline 1 on a transmission input shaft 20 with respect to a flywheel 22 with an inner t* open position.
The facing 21 of the clutch plate 33, which is slidably supported by the clutch plate 30, is pressed by the pressing plate 23 to transmit the rotation of the flywheel 22 to the transmission input shaft 20. Pressing plate 23
The pressing force is provided by a spring (not shown) that is simply inserted between the cover 26 and the flywheel 22, which are integrally connected to the flywheel 22.

A middle 111 portion of the release lever 27 is rotatably supported by a support @ 35 on a support 25 fixed to the cover 26 , and the outer end of the release lever 27 is connected to a bracket of the press plate 23 by a pin 24 . The transmission input wheel 20 is supported at its left end by the flywheel 22 by a bearing 32 and by the immovable casing 28 by a bearing 29 at its right end.

Guide 1 surrounding the transmission input shaft 20 in the casing 28!
117 are connected to each other, and a cylindrical shift block 13 is movably fitted around the outer periphery of the guide cylinder 17.

The outer ring of the release bearing 30 supported by the shift block 13 and having an angular cross section can come into contact with the inner end of the release lever 27 . When the clutch lever 9 is rotated counterclockwise together with the shaft 3 with respect to the casing 28, the clutch lever 9
hits the shift block 13 and pushes the shift block 13 to the left. When the shift block 13 moves to the left,
The release lever 27 is pushed by the release bearing 30 and the support shaft 35
The clutch is rotated clockwise around , the pressing force of the pressing plate 23 is released, and the clutch is disengaged. Conversely, when the clutch lever 9 is returned clockwise, the shift block 13 is returned to a predetermined position by the spring 31, and the clutch is connected.

A retaining plate 33 and a retaining plate 34 are superimposed on both sides of the clutch plate 2 to which the hub 2a is spline-fitted to the transmission input shaft 20, connected by a pin 40, and supported so as to be able to rotate slightly relative to each other. . A spring 14 is accommodated and supported in a plurality of square holes provided at circumferential intervals in the clutch plate 2, retaining plate 33, and retaining plate 34, and the spring 14 supports the flywheel 22.
The torque fluctuation of *m is attenuated between the transmission input shaft 20 and the transmission input shaft 20. A cushioning plate is coupled to the holding plate 33 by rivets 15, and facings 21 are coupled to both sides of the cushioning plate by rivets.

When the clutch is in the engaged state, a gap @S is provided in advance between the inner end of the release lever 27 and the end surface of the release bearing 30. Without this gap S, the release lever 27 would hit the release bearing 30, preventing the pressing plate 23 from moving to the left, preventing the facing 21 from being completely pressed against the flywheel 22, causing the facing 21 to slip and cause abnormal wear. .

In the present invention, when the facing 21 reaches the wear limit, the release lever 27 comes into contact with the release bearing 30, and the release bearing 30 rotates (rotates with the release bearing 30), so the wear limit of the clutch is detected from the rotation of the release bearing 30. be. For this reason, a rotation speed sensor 59 is disposed between the release bearing 30 and the shift block 13. That is, the ring 36 is wound around the outer periphery of the release bearing 30, and the magnetic body 36a is sandwiched between plate pieces that protrude radially outward from both ends of the ring 36, and the magnetic body 36a is sandwiched between the plate pieces. On the other hand, a bent-shaped bracket 38 is fixed to the outer ff wall of the shift block 13 with bolts 39, and the detection coil 37 is supported on the bracket 38 so as to face the magnetic body 36a.

FIG. 2 is a circuit diagram for activating an alarm when the release bearing 30 rotates with the clutch engaged.

511!2 In the figure, 37 is a detection coil, 41 to 50
is a resistor, 51.52 is a diode, 53 is a capacitor,
54 is a comparison amplifier, 55 is a transistor that serves as a switch, 57 is an alarm, specifically a warning light, and 56 is a switch that opens when the clutch pedal is depressed and closes when the clutch pedal is released.

Next, the operation of the clutch wear detection device according to the present invention will be explained. When the clutch pedal is released, ie, when the clutch is engaged, switch 56 closes the circuit. Facing 21 with clutch connected
When the wear limit is reached, the pressing plate 23 moves to the left by the amount of wear on the facing, and the release lever 27 receives the force of the spring 12 and rotates counterclockwise around the support shaft 35 in FIG. , the inner end of the release lever 27 contacts the end surface of the release wheel holder 30. Since the release lever 27 rotates together with the pressing plate 23, the release bearing 30 is also rotated, and the magnetic body 36a comes into contact with and separates from the detection coil 37. This results in
An induced voltage is generated in the detection coil 37.

In FIG. 2, the alternating induced voltage of the detection coil 37 is rectified and input to a comparator amplifier 54, where it is compared with a reference voltage. When the induced voltage in the detection coil 37 is higher than the reference voltage, the output voltage of the comparison amplifier 54 is applied to the base of the transistor 55. When the transistor 55 becomes conductive, power is supplied from the power source battery 58 to the resistor 50, the switch 56, the warning light 57, and the transistor 55, and the warning light 57 lights up, allowing the driver to visually recognize that the clutch has reached its wear limit.

Furthermore, when the clutch is in the disengaged state, the clutch lever 9
, the shift block 13 is pushed to the left in FIG.
5 in the clockwise direction, the force of the pressing plate 230 that presses the facing 21 against the flywheel 22 is released, and transmission of engine rotation to the transmission input shaft 20 is interrupted. At this time, the release bearing 30 is rotated and a 1 & conductive voltage is generated in the detection coil 37, but the warning light 57 does not light up because the switch 56 responsive to the clutch pedal is open.

In addition, in the above-mentioned structure, the induced voltage of the detection coil 37 can be applied directly to the transistor 55 without using the comparison amplifier 54, and the warning light 57 can be made to blink.

[Effects of the Invention] As described above, the present invention includes a detection coil disposed in the shift block that is pushed by the clutch lever, and a release bearing that is pushed by the shift block to rotate the release lever in the clutch disengagement direction. A magnetic material is supported on the outer circumferential wall, and a switch that closes due to the induced voltage in the detection coil when the magnetic material comes into contact with or separates from it and a switch that closes when the clutch pedal is released are connected in series to the alarm drive circuit. A rotation speed sensor consisting of a magnetic material and a detection coil can be easily installed without changing the clutch configuration, and the alarm is activated by the signal from a single rotation speed sensor. The number of parts is small, the alarm drive circuit is simple, and it can be provided at low cost.

By simply setting the ms of the release bearing and the release lever in advance in accordance with the wear limit of the facing, the wear state of the facing can be accurately detected.

According to the present invention, even if the gap between the inner end of the release lever and the release wheel holder disappears for some reason before the facing wears out, the alarm is activated. ) Early wear of the acing can be prevented in advance.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a clutch equipped with a clutch wear detection device according to the present invention, and FIG. 2 is an electric circuit diagram of the clutch wear detection device. 9: Clutch lever 13: Shift block 27: Release lever 30 Nirezu bearing 36a: Magnetic body 37: Detection coil 55: Transistor (switch) 56: Switch

Claims (1)

[Claims] A detection coil is installed on the shift block that is pushed by the clutch lever, and a magnetic material is supported on the outer peripheral wall of the release bearing that is pushed by the shift block to rotate the release lever in the direction of clutch disengagement. This is a clutch wear detection device in which a switch that closes due to the voltage induced in the detection coil associated with this and a switch that closes when the clutch pedal is released are connected in series to the alarm drive circuit.