JPH0371573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clutch master cylinder of a non-adjustable clutch release mechanism in which a diaphragm spring of a clutch and a release bearing are in contact when the clutch pedal is released, and in particular, the present invention relates to a clutch master cylinder of a non-adjustable clutch release mechanism in which a clutch diaphragm spring and a release bearing are in contact when the clutch pedal is released. Regarding the clutch master cylinder that can be used.

In a clutch master cylinder with a non-adjustable clutch release mechanism, the cylinder chamber communicates with the reservoir through the inlet port on the end face of the cylinder chamber, and when the piston moves a predetermined amount toward the inlet port, the inlet valve moves radially from the inlet port. Close the inflow port by abutting the outer part. The play of the clutch pedal in a non-adjustable clutch release mechanism is determined by the sum of the play of the clutch pedal and the amount of valve lift of the inlet valve, and is an important factor in obtaining a favorable operating feeling of the clutch pedal. ,
With conventional non-adjustable clutch release mechanisms, it has been difficult for the user to arbitrarily adjust the play of the clutch pedal. In addition, increasing the play of the clutch pedal to adjust the play makes it easier for the push rod of the clutch pedal to come into contact with an inappropriate part of the piston of the clutch master cylinder when the clutch pedal is operated, and the push rod will not fit properly. This causes wear on the contact area between the push rod and the piston when moving to the contact point.

SUMMARY OF THE INVENTION An object of the present invention is to provide a clutch master cylinder that allows a user to easily adjust the play of a clutch pedal without causing problems such as abnormal noise in a non-adjustable clutch release mechanism.

In order to achieve this object, the clutch master cylinder of the non-adjustable clutch release mechanism of the present invention is constructed as follows.

In other words, when the piston installed in the cylinder chamber of the cylinder body moves a predetermined stroke by depressing the clutch pedal, the communication between this cylinder chamber and the reservoir tank is cut off by the inlet valve, and thereafter the movement of the piston is stopped. In a clutch master cylinder of a non-adjustable clutch release mechanism in which the hydraulic pressure in the cylinder chamber is increased as the hydraulic pressure in the cylinder chamber increases, the connection between the plug end surface and the inlet valve is made from the side facing the inlet valve with respect to the cylinder body. an adjustment plug screwed in such that the distance between the adjustment plugs can be adjusted; an oil passage formed to maintain communication with the reservoir tank within the adjustment range of the adjustment plug; The plug has an inflow port opened at the end surface of the plug. The inlet port is configured to be closed when the inlet valve comes into contact with the tip end surface of the plug.

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, a cylindrical cylinder chamber 2 is formed in a cylinder body 1, and a piston 3 is provided within the cylinder chamber 2 so as to be slidable in the axial direction. The seal cup 4 is provided in an annular groove on the outer periphery of the piston 3 and keeps the cylinder chamber 2 oil-tight.
The piston 3 is further formed with a hole 5 extending along the central axis, and a stopper 7 is attached to the open end side of the hole 5. The connecting rod 8 has at one end a flange end 9 which can be inserted into the bore 5 of the piston 3 and abutted against the stopper 7, and at the other end is connected to an inlet valve 10 made of an elastic material. The inlet valve case 11 accommodates the inlet valve 10 inside in the radial direction, and is provided so as to be slidable in the cylinder chamber 2 in the axial direction. A cylindrical compression coil spring 12 is attached to a spring retainer 1 fixed to the outer periphery of the inlet valve case 11 and the piston 3.
3, the conical compression coil spring 14
is provided between the inlet valve 10 and the inlet valve case 11. Cylindrical coil spring 1
The spring force 2 is greater than the spring force of the conical coil spring 14, and the flange end 9 of the connecting rod 8 is held in contact with the stopper 7 when the clutch pedal is not depressed. The adjustment plug 19 has a threaded groove 20
cylinder body 1
It is screwed in from one end, and its distal end surface 21 protrudes from an end surface 22 of the cylinder chamber 2 toward the inlet valve 10. The amount of protrusion of the tip surface 21 from the end surface 22, that is, the axial position of the tip surface 21, is adjusted by rotation of the adjustment plug 19, and the locking nut 23 prevents the adjustment plug 19 from rotating. Furthermore, since the outer diameter of the inlet valve 10 is smaller than the outer diameter of the tip of the adjustment plug 19, even if the tip surface 21 is retracted from the end surface 22 of the cylinder chamber 2, the inlet valve 10 will be able to reach the tip beyond the end surface 22. Surface 21
It is possible to move up to An annular groove 25 having a predetermined width in the axial direction is formed on the outer periphery of the adjustment plug 19.
This annular groove 25 communicates with a reservoir tank 28 through an oil passage 29 formed in the cylinder body 1. Further, the annular groove 25 is connected to the adjustment plug 19.
It communicates with an inflow port 27 at the center of the distal end surface 21 via an oil passage 26 inside. The outer periphery of the adjustment plug 19 on both sides of the annular groove 25 in the axial direction is provided with O.
Rings 32, 33 are provided. Adjustment plug 19 is moved to the right to the maximum B1 based on the position shown in Figure 1.
Alternatively, the connection between the oil passage 29 and the annular groove 25 is maintained until it is moved to the left by a maximum of B2.

When the clutch pedal is depressed only a little, the push rod of the clutch pedal comes into contact with the end face of the piston 3, and the piston 3 starts moving toward the inflow port 27. Note that before the piston 3 starts moving, the inlet valve 10 is moved by the adjustment plug 19 due to the spring force of the compression coil spring 12.
The inflow port 27 is opened. At this time, the tip surface 21 of the adjustment plug 19 and the inlet valve 10
The distance between the valve and the end face is defined as the valve lift amount A.

Now, with the movement of the piston 3, the inlet valve 10 is moved in a direction approaching the tip surface 21 of the adjustment plug 19 due to the spring force of the conical coil spring 14;
In other words, it moves in the direction of decreasing the valve lift amount A. After the inlet valve 10 has moved by the valve lift amount A, the tip surface 21 of the adjustment plug 19
and closes the inflow port 27. The amount of depression of the clutch pedal until the inlet port 27 is closed by the inlet valve 10 is defined as the play of the clutch pedal, but in this device, the amount of protrusion of the tip surface 21 from the end surface 22 is determined by the rotation of the adjustment plug 19. Therefore, the valve lift amount A can be adjusted within the range of -B2 to B1 based on the value in Figure 1, so
It is possible to adjust the play of the clutch pedal.

FIG. 2 is a graph showing the relationship between the amount of movement of the piston 3 and the oil pressure in the cylinder chamber 2 in the apparatus shown in FIG. The solid line shows the characteristics when the tip end surface 21 of the adjustment plug 19 is in the position shown in FIG. Tip surface 2
The protrusion amount of 1 is −B2 to B1 with respect to the reference amount in Figure 1.
Since it can be adjusted within the range of , it is possible to select the characteristics within the range of the broken line in FIG.

Note that in order to maintain the connection between the inflow port 27 of the adjustment plug 19 and the oil passage 29 of the cylinder body 1 within the movement range of B1 + B2 of the adjustment plug 19, instead of providing an annular groove 25 on the outer circumferential surface of the adjustment plug 19. It is clear that an annular groove 25b may be provided on the inner peripheral surface of the insertion hole of the adjustment plug 19, as shown in FIG.

According to the present invention, the valve lift amount of the inlet valve is adjusted by changing the axial position of the inflow port member formed with the inflow port and abutted by the inlet valve.
The user can arbitrarily adjust the play of the clutch pedal. Further, such a change in the valve lift amount does not cause problems such as generation of abnormal noise when operating the clutch pedal.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is a graph showing the relationship between piston stroke and cylinder oil pressure in the device shown in Fig. 1, and Fig. 3 is a diagram showing another example of an annular groove. . 2...Cylinder chamber, 10...Inlet valve, 1
9... Adjustment plug, 21... Tip surface, 27... Inflow port, 28... Reservoir.

Claims (1)

[Claims] 1. When a piston provided in a cylinder chamber of a cylinder body moves a predetermined stroke by depressing a clutch pedal, communication between this cylinder chamber and a reservoir tank is cut off by an inlet valve. Then, in a clutch master cylinder of a non-adjustable clutch release mechanism configured to increase the hydraulic pressure in the cylinder chamber as the piston moves, An adjustment plug screwed in such that the distance between the plug tip face and the inlet valve can be adjusted; and an oil passage formed to maintain communication with the reservoir tank within the adjustment range of the adjustment plug. , an inflow port opened on the plug end face on an extension of the oil passage, and the inlet port is configured to be closed when the inlet valve comes into contact with the plug end face. The clutch master cylinder features a non-adjustable clutch release mechanism.