JPH0426739Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power clutch for a vehicle.

[Prior Art] In the power clutch disclosed in Japanese Utility Model Application No. 61-17536, the pressure oil sent from the master cylinder to the slave cylinder is also sent to the actuator that drives the control valve through a passage in the main body. Pressurized air is sent from the pressurized tank to the power cylinder via this control valve. This power clutch is normally mounted forward and downward relative to the vehicle body, but the hydraulic passage that communicates with the master cylinder extends upward across the slave cylinder, and the upper end connects to the cylinder of the actuator that drives the control valve. Because they are connected, it is difficult for air trapped deep inside the slave cylinder to escape.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a power clutch that allows air to completely escape from the slave cylinder.

[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention is to provide an abutment portion on the rod that engages with the piston of the slave cylinder, and to abut the piston against the abutment portion. A locking member is provided on the cylinder side to lock it in the pushed-back state.

[Operation] The piston 10 of the slave cylinder B is completely pushed back, and the locking member 38 is moved to the abutting portion 3 of the rod 12.
7, the pushed back state of the piston 10 is maintained, and the working chamber 35 of the cylinder 9 is engaged.
Since the volume of the cylinder 9 is minimized, the air inside the cylinder 9 is forced into the passage 13 of the body 8 and is discharged to the outside through the breather 36.

[Embodiment of the invention] As shown in FIG. 1, 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 1 in the main body 8.
3.

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 communicates with the working chamber 22 of the diaphragm-type control valve D via the pipe 19.

The control valve D is provided at the upper part of the main body 8,
A rod 34 is engaged with a piston 20 actuated by hydraulic pressure supplied from a passage 13 to a cylinder 29. This rod 34 is supported by the diaphragm 33, and when 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, and pressurized air is introduced into the working chamber 22 from the inlet 26.

The diaphragm 33 creates an atmospheric chamber 21 and an operating chamber 2.
Normally, the rod 34 is separated from the valve body 24 by the force of the spring 23, and the working chamber 22 is communicated with the atmospheric chamber 21 through an internal passage of the rod 34.

When the clutch pedal 2 is depressed to disconnect the clutch, pressurized oil is supplied from the master cylinder A to the working chamber 35 of the slave cylinder B, as described above, and the rod 12 is pushed to the right through the known clutch lever. the release lever is rotated.
At the same time, pressure oil is supplied from the master cylinder A to the cylinder 29 of the control valve D, and when the piston 20 pushes the rod 34 to the right, pressurized air is supplied from the inlet 26 to the working chamber 22. Then, it is sent to the working chamber 31 of the power cylinder C. 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, a locking member 38 made of a pin is supported on the wall of the cylinder 9 so as to be able to protrude into the interior of the cylinder 9, while a flange is integrally formed on the rod 12 to form the abutting portion 37. . The locking member 38 is retained by suitable means to prevent it from falling off. Bolts may be used instead of pins.

The abutting portion 37 may be provided with a pin hole in the rod 12 instead of a flange. Instead of the rod 12, a temporary rod may be incorporated when the power clutch is assembled to the vehicle body. Furthermore, piston 1
The abutting portion may be formed directly at 0.

When the power clutch is installed at an angle so that the chain line X shown in Fig. 1 is horizontal, the working chamber 3
The air in the chamber 35a above the chain line X in No. 5 cannot escape.

According to the present invention, the piston 1 is
0 is pushed back to the left, the air in the working chamber 35 is expelled into the passage 13. At this time, the abutting portion 37 of the rod 12 moves to the left of the lock member 38, so if the lock member 38 is pushed down, the piston 1
0 is locked in the pushed back state. and,
When hydraulic oil is supplied from the master cylinder A to the passage 13 and the breather 36 is released, the air in the pipe 3, the passage 13, and the working chamber 35 is discharged from the master cylinder A to the outside from the breather 36 together with the hydraulic oil. After the air is removed, lock member 38 is turned on again.
By pulling up, normal clutch operation is possible.

In addition, instead of locking the piston 10 in the completely pushed back state, if the working chamber 35 is filled with a non-flowing oil that dissolves in the working oil before assembling the cylinder 9 into the main body 8, the power clutch can be firmly attached to the vehicle body. After installation, when the master cylinder is filled with hydraulic oil, the air in the pipe 7 and passage 13 is completely removed from the breather 36, and the non-flowing oil is dissolved in the hydraulic oil, making it possible to operate the power clutch.

[Effects of the invention] As described above, the present invention is provided with a locking member on the cylinder side that abuts against the abutting portion of the rod that engages with the piston of the slave cylinder and locks the piston in the pushed back state. This makes it extremely easy to bleed air from the hydraulic system after the power clutch is assembled to the vehicle body, and the air can be completely bleed. Since the slave cylinder is provided with a lock member and the rod is provided with an abutting portion,
It can be easily implemented without significant changes to conventional power clutch components.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a power clutch according to the present invention. A...Master cylinder, B...Slave cylinder, C...Power cylinder, D...Control valve, 9...
...Cylinder, 10...Piston, 12...Rod, 35, 35a...Working chamber, 37...Abutment part,
38...Lock member.

Claims (1)

[Scope of utility model registration request] A power clutch characterized in that an abutting portion is provided on a rod that engages with a piston of a slave cylinder, and a locking member that abuts against the abutting portion and locks the piston in a pushed back state is provided on the cylinder side.