JPH0429135Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a clutch facing wear warning device.

[Prior Art] In the wear warning device disclosed in Japanese Utility Model Application Publication No. 57-174822, when the facing reaches its wear limit, it comes into contact with a sounding plate fixed to the clutch housing side and emits an alarm. Because the mounting location is inside the clutch housing and is exposed to engine noise, it is difficult to hear the warning sound. Furthermore, in the device disclosed in Japanese Utility Model Application No. 61-45631, when the facing reaches its wear limit, the return position of the piston of the power cylinder gradually retreats, and eventually the piston pushes a switch on the end wall of the power cylinder. The alarm circuit is closed. However, since it takes about three years for the facing to reach its wear limit, whether the switch can be maintained in a normal operating state during that period is quite a problem depending on the surrounding conditions at the mounting location.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a wear warning device for a clutch facing that shows little change over time and is reliable in operation.

[Means for solving the problem] In order to achieve the above object, the configuration of the present invention is such that a housing having an inlet communicating with the atmospheric chamber of the power cylinder and an outlet communicating with the horn is connected to the shaft of the clutch lever. The valve body is rotatably fitted with a valve body having a passage which communicates the inlet and outlet when the facing wears out.

[Operation] The amount of return rotation of the clutch lever 47 gradually increases as the facing 53 wears, and accordingly, the valve body 62 of the shaft 46 is also rotated in the opposite direction, and eventually the passage 65 connects the inlet 63 and outlet 6 of the housing 61.
6 is communicated.

Therefore, when the clutch is disengaged, a portion of the air sent from the atmospheric chamber 32 of the power cylinder C to the breather 41 flows through the pipe 42, the inlet 63 of the valve F, the passage 65,
It flows through the exit 67 to the alarm horn 69, which emits an alarm sound.

[Embodiment of the invention] As shown in FIG. 2, the power clutch is composed of a master cylinder A, a slave cylinder B, a power cylinder C, and a control valve D. In the master cylinder A, when the piston 4 is pushed by the clutch pedal 2 via the rod 3, the hydraulic oil in the reservoir 5 flows from the cylinder 6 through the pipe 7 to the passage 13 in the main body 8.
It is now being supplied to

In the slave cylinder B, a piston 10 is fitted into a cylinder 9 connected to the main body 8, and when the rod 12 engaged with the piston 10 is pushed to the right, the release lever is rotated and the clutch is disconnected. The working chamber 35 of the slave cylinder B is communicated with the passage 13. A rod 16 passing through the body 8 is biased into engagement with the piston 10 by a spring 18. The penetrating portion of the rod 16 is sealed by a sealing member 17.

In the power cylinder C, a piston 15 is fitted into a cylinder 14 coupled to a main body 8, and an operating chamber 31 and an atmospheric chamber 32 are defined. Due to the force of the weak spring 18 housed in the working chamber 31, the rod 16 connected to the piston 15 is engaged with the piston 10 as described above. The working chamber 31 is communicated with the working chamber 22 of the control valve D via the pipe 19.

The control valve D is provided at the upper part of the main body 8,
When the piston 20 actuated by the hydraulic pressure supplied from the passage 13 to the cylinder 29 is pushed to the right against the force of the spring 23, the valve body 24 is pushed away from the valve seat 28 against the force of the spring 25. , pressurized air is introduced into the working chamber 22 through the inlet 26.

The large diameter portion of the piston 20 separates the atmospheric chamber 21 and the working chamber 22. Normally, the force of the spring 23 separates the piston 20 from the valve body 24, and the working chamber 22 is separated from the atmospheric chamber 21 through the internal passage of the piston 20. communicated.

When the clutch pedal 2 is depressed to disconnect the clutch, pressure oil is supplied from the master cylinder A to the working chamber 35 of the slave cylinder B as described above, pushing the rod 12 to the right and releasing the clutch via the clutch lever. The lever is rotated. At the same time, from master cylinder A to cylinder 2 of control valve D
When pressure oil is supplied to the piston 9 and the piston 20 is pushed to the right, pressurized air is supplied from the inlet 26 to the working chamber 22 and further sent to the working chamber 31 of the power cylinder C via the pipe 19. Piston 15 is pushed to the right, and piston 10 of slave cylinder B is pushed to the right via rod 16.

In this way, the piston 10 of slave cylinder B
The hydraulic pressure from the master cylinder A and the air pressure from the power cylinder C are applied to reduce the operational burden on the clutch pedal 2.

According to the present invention, the atmospheric chamber 3 of the power cylinder C
2 is communicated with the atmospheric chamber 21 through the internal passage of the main body 8, and further communicated with the breather 41. A pipe 42 is connected in the middle of the breather 41, and is connected to a valve F integrally formed with the shaft 46 of the clutch E, as shown in FIG. Clutch E presses a facing 53 against a flywheel 52 of the engine by means of a pressure plate 51, and transmits rotation of the flywheel 52 to the shaft 50. To disengage the clutch, push the release bearing 48 to the right and rotate the release lever 49, and the pressure plate 51
The force pressing the facing 53 against the flywheel 52 is released. The release bearing 48 is pressed by the clutch lever 47, and this shaft 46 is driven by the slave cylinder B via the rod 12 connected to the lever 44.

The valve F has a valve body 6 integrated with the housing 61 and the shaft 46.
It consists of 2. As shown in FIG. 3, a cylindrical housing 61 is provided with an inlet 63 and an outlet 67 spaced apart from each other in the circumferential direction. communicated. A resonator 68 is attached to the outlet 67, thereby forming a horn 69. A passage 65 is provided in the valve body 62 to communicate the grooves 64 and 66. As shown in FIG. 4, both ends of the grooves 64 and 66 are sealed by a seal member 70.

Next, the operation of the clutch facing wear warning device according to the present invention will be explained. The passage 65 of the valve F is in the return position shown in FIG. 3 when the facing 53 of the clutch E has not reached its wear limit. If the facing 53 wears out, the pressure plate 51 will become attached to the flywheel 5 when the clutch is connected.
2 becomes larger, the return stroke of the release bearing 48 returned by the release lever 49 also becomes larger, and the shaft 46 of the clutch lever 47 and the valve body 62 are rotated counterclockwise. In Figure 3, the groove 6 is formed by the passage 65.
4 and 66 are communicated.

In this state, when the clutch is disengaged, the power cylinder C
When the piston 15 is pushed to the right in FIG. released to. Therefore, the alarm 69 sounds at the beginning of the clutch disengagement operation, thereby sensing that the facing 53 has reached its wear limit.

In the embodiment described above, the shaft 4 of the clutch lever 47
Valve F and an alarm 69 are integrally constructed in 6, but if the outlet 67 of valve F is connected to the alarm in the driver's cabin via a pipe, the facing can also sense the wear limit during operation. be able to.

[Effects of the invention] As described above, the present invention has a housing that has an inlet that communicates with the atmospheric chamber of the power cylinder and an outlet that communicates with the alarm, and is interlockingly connected to the shaft of the clutch lever. The valve body is rotatably fitted with a valve body having a passage communicating with the clutch housing and the outlet, and since the valve is placed outside the clutch housing, the warning sound is not interfered with by engine noise, etc., and is suitable for electric switches, etc. Unlike the clutch lever, the valve is always operated together with the clutch lever, so it does not rust and operates reliably.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a power clutch equipped with a wear warning device according to the present invention, Fig. 2 is a side sectional view of the power clutch, Fig. 3 is a side sectional view of a clutch facing wear warning device, and Fig. 4. is a front sectional view of the same. C...Power cylinder, 41...Breather, 4
2... Pipe, 46... Shaft, 47... Clutch lever, 53... Facing, 61... Housing, 62... Valve body, 63... Inlet, 65... Passage, 67... Outlet, 69... Alarm bell, 70... Seal member.

Claims (1)

[Scope of utility model registration request] A housing having an inlet communicating with the atmospheric chamber of the power cylinder and an outlet communicating with the horn is provided with a valve body connected to the shaft of the clutch lever and having a passage communicating the inlet and outlet when the facing wears out. A wear warning device for clutch facings that are movably fitted together.