JPS5969534A - Clutch master cylinder for non-adjustable clutch release mechanism - Google Patents

Abstract

PURPOSE:To adjust the play of a clutch pedal as desired by axially movably providing a flow-in port member, with which a flow-in port is formed and an inlet valve is brought in contact, and varying the quantity of the valve lift of said valve. CONSTITUTION:As a clutch pedal is pressed in by an amount of the play of the pedal, a piston 3 is moved leftward. Since the spring force of a cylindrical compression coiled spring 12 is greater than the spring force of a conical coiled spring 14, said spring 14 is maintained in a compressed condition, the left end of an inlet valve 10 is positioned on the right side of the left end of its case 11, and a flow-in port 27 is kept opened. When the clutch pedal is further pressed in, the case 11 is brought in contact with the end surface of a cylinder chamber 2 and, after that, said valve 10 is moved leftward by the valve-lift quantity A and brought in contact with the end surface 21 of an adjusting plug 19, closing the flowin port 27. And, the adjusting plug 19 is rotated, causing the valve-lift quantity A to vary, and the play of the clutch pedal is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to (1) a clutch mask cylinder of a non-adjustable clutch release mechanism in which a diaphragm spring of a clutch and a release bearing are in contact with each other when a clutch pedal is released; Clutch mask cylinder that can be adjusted by the user.

In a clutch master cylinder with a non-adjustable clutch release mechanism, the cylinder chamber communicates with the reservoir via an inflow boat on the end face of the cylinder chamber, and when the piston moves a predetermined amount toward the inflow boat, the inlet valve moves radially from the inflow boat. Close the inflow boat by abutting the outer part of the direction. 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 in order 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 mask cylinder when operating the clutch pedal, and the push rod (2) This causes wear of the contact area between the push rod and the piston when the piston moves to its proper 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, in the clutch master cylinder of the non-adjustable clutch release mechanism of the present invention, the inflow port member, which is formed with an inflow port and is abutted by the inlet pulp, is provided so that its position in the axial direction can be adjusted. ing.

The present invention will be described in detail 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. Seal cup 4 is
It is provided in an annular groove on the outer periphery of the piston 3 to keep the cylinder chamber 2 oil-tight. The piston 3 is further formed with a hole 5 extending along the central axis, and several stoppers 7 (3) are provided on the open end side of the hole 5. The connecting rod 8 is inserted into the hole 5 of the piston 3 and has a flange end 9 which can come into contact with the stopper 7 at one end, and is connected 17 to an inlet pulp 10 of an elastic material at the other end. The inlet valve case 11 has an inlet pulp 1 on the inside in the radial direction.
It accommodates 0 and is provided so as to be slidable in the axial direction within the cylinder chamber 2. A cylindrical compression coil spring 12 is provided between the inlet pulp case 11 and a spring holder 13 fixed to the outer periphery of the piston 3, and a conical compression coil spring 14 is provided between the inlet pulp case 10 and the inlet valve case 11. provided in between.

The spring force of the cylindrical coil spring 12 is equal to the conical coil spring 1/
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 portion formed with a threaded groove 20, is screwed into one end of the cylinder body 1, and its tip end surface 21 projects toward the inlet pulp 10 from an end surface 22 of the cylinder chamber 2. End face 22
(4) The amount of protrusion of the distal end surfaces 21, that is, the axial position of the distal end surfaces 21 is adjusted by rotation of the adjustment plug 19, and the locking nut 23 prevents the adjustment plug 19 from rotating. In addition, since the outer diameter of the inlet pulp 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 pulp 10 will move beyond the end surface 22 to the tip surface 21. It is possible to move up to An annular groove 25 having a predetermined width is formed in the outer periphery of the adjustment plug 19 in the axial direction.
The distal end surface 21 communicates with the inflow port 27 of the inner shaft through the vias 1 to 6. O-rings 32 and 33 are provided on the outer periphery of the adjusting plug 19 on both sides in the axial direction in pairs 1 to 1 in the annular groove 25, respectively. The connection between the oil passage 29 and the annular groove 25 is maintained until the adjustment plug 19 moves to the right by a maximum B1 or to the left by a maximum B2 with respect to the position shown in FIG.

When the clutch pedal is fully depressed, the push rod of the clutch pedal comes into contact with the end surface of the piston 3, and the piston 3 starts moving toward the inflow port 27 (5). Since the spring force of the cylindrical compression coil spring 12 is greater than the spring force of the conical coil spring 14, the conical coil spring 14 is maintained in a compressed state, and the end of the inlet pulp 10 on the inlet port 27 side is connected to the inlet valve case 11. It is located closer to the piston 3 than the end on the inflow port 27 side, and the inflow port 27 is open.

The distance between the adjustment plug tip surface 21 and the end surface of the inlet pulp 10 on the inflow port 27 side when the clutch pedal is further increased and the inlet valve case 11 comes into contact with the end surface of the cylinder chamber 2 is defined as the valve lift amount A. It is defined as After the inlet valve case 11 comes into contact with the end face of the cylinder chamber 2, the inlet pulp 10 is moved toward the inflow port 27 by the conical coil spring 14 as the piston 3 moves, and after moving by the valve lift amount A, It contacts the tip end 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 pulp 10 is defined as the play of the clutch pedal (6). protrusion amount, therefore valve lift amount A
can be adjusted in the range of -B2 to B1 based on the value shown in FIG. 1, so the play of the clutch pedal can be adjusted.

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 indicates the characteristic when the tip end surface 21 of the adjustment plug 19 is in the position shown in FIG. Since the amount of protrusion of the tip surface 21 can be adjusted within the range of -B2 to B1 with respect to the reference amount in FIG. 1, the characteristics within the range indicated by the broken line in FIG. 2 can be selected.

As described above, according to the present invention, the amount of valve lift of the inlet pulp is adjusted by changing the axial position of the inflow boat member that forms the inflow boat and is abutted by the inlet pulp. can be adjusted arbitrarily. However, such a change in the valve lift amount does not cause problems such as generation of abnormal noise when operating the clutch pedal.

(7)

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the piston stroke and cylinder oil pressure in the device shown in FIG. 2... Cylinder chamber, 10... Inlet pulp, 1
9... Adjustment plug, 21... Tip surface, 27... Inflow boat, 28... Reservoir. (8) Written amendment to the procedure for mold infestation (voluntary) May 25, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Indication of the case 1983 Patent Application No. 179863 Part 2. Name of the invention Non-adjustable clutch release Clutch mask cylinder 3 of the mechanism, in connection with the case of the person making the amendment/Previous applicant (320) Name SL-Yota Automobile Co., Ltd. 4, Agent telephone number (271) 4939/5462, (623),
) Name Patent Attorney Nakaheiji Haji In the specification, 1. ``Can be done.'' on the 7th former line 12th has been corrected as follows, and ``Can be done.'' In order to maintain the connection between the inflow boat 27 of No. 19 and the oil passage 29 of the cylinder body 1, instead of providing the annular groove 25 on the outer peripheral surface of the adjustment plug 19, as shown in FIG. An annular groove 2 is provided on the inner peripheral surface of the insertion hole of 19.
5b may also be provided. ” 2 No. 800, line 4, “It is a graph.” is corrected as follows: “Graph, Figure 3 is a diagram showing another example of an annular groove.” B Figure 3 attached to the drawing Add. 3rd N 6 208-\1. 3

Claims (1)

[Claims] The cylinder chamber communicates with the reservoir 17 through an inflow boat on the end face of the cylinder chamber, and when the piston moves a predetermined amount toward the inflow boat, the inlet valve contacts a portion radially outward from the inflow boat and closes the inflow boat. A non-adjustable clutch mask cylinder of an adjustable clutch release mechanism, characterized in that an inflow boat member formed with an inflow boat and abutted by an inlet valve is provided so that its axial position can be adjusted. Clutch mask cylinder of clutch release mechanism.