JP2566144Y2 - Clutch master cylinder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch master cylinder which operates by a clutch pedal and feeds oil supplied from an oil reservoir tank to a clutch booster to operate the same.

[0002]

2. Description of the Related Art FIG. 2 schematically shows a conventional clutch control, and FIG. 3 shows a cross section of a conventional clutch master cylinder.

As shown in FIG. 2, a clutch pedal 11 is rotatably supported by a shaft 12 at a predetermined position on a vehicle body. A mounting bracket 13 is integrally fixed to a base end portion of the clutch pedal 11 by welding, and a push rod 15 of a clutch master cylinder 14 fixed to the vehicle body is connected to the mounting bracket 13. The oil reserve tank 1 is provided in the clutch master cylinder 14.
6 is connected to a clutch booster 18 via a connecting pipe 17. Also, clutch booster 1
An air tank 19 is connected to 8.

[0004] In the clutch master cylinder 14, as shown in FIG.
The piston 22 is urged rightward in FIG. 3 by a return spring 23. A connecting pipe 17 is provided at the tip of the cylinder 21.
Is formed, while a dust cover 25 is attached to the base end to cover the push rod 15 connected to the piston 22.

[0005] A supply valve 26 is attached to the tip of the piston 22 so that the chambers 27 and 28 can communicate with each other. A port 29 is formed in the cylinder 21 to communicate with the chamber 28, and a nipple 30 for connecting a connection pipe from the oil reserve tank 16 is formed.
Is installed. Reference numeral 31 denotes a supply valve stopper.

As shown in FIG. 2, when the clutch pedal 11 is depressed, the push rod 15 of the clutch master cylinder 14 is pushed via the mounting bracket 13 and a hydraulic pressure is generated. The generated hydraulic pressure acts on the clutch booster 18 via the connecting pipe 17 so that the clutch (not shown) is disengaged to interrupt the transmission of power.

[0007]

In the above-described clutch master cylinder, before filling the inside of the clutch master cylinder, air is contained in the connecting pipe 17 communicating with the clutch booster 18. The connecting pipe 17 causes the hydraulic pressure generated by the clutch master cylinder 14 to act on the clutch booster 18. In order to operate the clutch booster 18 accurately, the air in the clutch master cylinder 14 must be evacuated in advance. .

In the conventional clutch master cylinder 14, when bleeding the connecting pipe 17, the end of the connecting pipe 17 on the clutch booster 18 side is removed, and the clutch pedal 11 is depressed many times in this state. To supply the oil from the oil reservoir tank 16 to the connecting pipe 17 through the cylinder 21. Then, the air in the connecting pipe 17 is pushed out by the supplied oil, and the oil flows out from the end of the connecting pipe 17 to release the air.
Is connected to the clutch booster 18 to complete the air bleeding operation.

However, when the oil is supplied from the oil reservoir tank 16 through the cylinder 21 to the connecting pipe 17, the oil flows from the room 28 through the supply valve 26 into the room 27. The supply valve 26 has a narrow valve passage so that the allowance of the clutch pedal does not change. For this reason, there is a problem that the flow rate of the oil at one time is small, and it takes a long time to bleed the air from the connecting pipe 17 and the work is troublesome.

In order to efficiently bleed the air from the connecting pipe 17, a port communicating with the chamber 27 is formed in the cylinder 21 and a fluid reservoir is prepared separately from the oil reservoir tank 16. Oil is supplied to the connecting pipe 17 through the chamber 27 to bleed air from the connecting pipe 17. However, this method requires a separate fluid reservoir and is not practical.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a clutch master cylinder which improves workability of an air bleeding operation.

[0012]

In order to achieve the above-mentioned object, a clutch master cylinder according to the present invention is provided with a clutch pedal.
Piston operated by a push rod linked to the
Caused by the piston sliding in the cylinder
Supply hydraulic pressure to the clutch booster only through the connecting pipe
Supply valve in the oil reserve tank
A clutch master cylinder having a hydraulic chamber communicated with the oil reserve tank and the oil reserve tank.
A pressure chamber is connected and provided in parallel with the supply valve.
And open and close the bypass.
An on-off valve is provided.

[0013]

[Function] To release air , open the on-off valve and
The open / close valve intervenes between the reserve tank and the hydraulic chamber in the cylinder.
It is connected by the installed bypass. Then, the oil is supplied to the hydraulic chamber through the bypass passage and flows into the clutch booster. Therefore, oil is Oiruriza
The bypass provided from the tank to the supply valve
The oil supply time can be shortened by being circulated through the oil passage .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a cross section of a clutch master cylinder according to an embodiment of the present invention. Members having the same functions as those in the related art are denoted by the same reference numerals, and redundant description is omitted.

As shown in FIG. 1, in a clutch master cylinder 41, a piston 22 is movable within a cylinder 42 and is urged and supported by a return spring 23. The connection pipe 17 is connected to the distal end of the cylinder 21, while the push rod 15 is connected to the piston 22 on the proximal end side. Room in cylinder 42 (oil
The pressure chambers 27 and 28 communicate with each other via a supply valve 26 at the distal end of the piston 22. A port 29 is formed in the chamber 28, and a nipple 30 for connecting a connection pipe from the oil reserve tank 16 is mounted. .

A port 43 communicating with the chamber 27 is formed in the cylinder 42, and a bypass passage 44 is formed in the cylinder 42 along the axial direction and communicating with the port 43. An open / close valve (open / close valve) 45 is attached to the intersection of the port 43 and the bypass passage 44. An O-ring 46 is attached to the opening / closing valve 45, and a sealing member 47 is attached to an end of the bypass passage 44. Thus, the oil reserve tank 16
The room 27 is connected to the room 27 through the room 28 and the supply valve 26.
And in parallel with the supply valve 26
In the bypass path 44 provided with an opening / closing valve 45
It is provided to be able to communicate more.

Thus, in the clutch master cylinder 41 of the present embodiment, when bleeding the connecting pipe 17, first remove the end of the connecting pipe 17 on the clutch booster side, and open and close the open / close valve 45. To make the bypass passage 44 and the port 43 communicate with each other. That is, the oil reserve tank 1
6 and the room 27 are communicated. Then, the oil from the oil reservoir tank through the bypass passage 44 and the port 43 is depressed several times clutch pedal in this state Part
To the shop 27 and the connecting pipe 17. Then, the connecting pipe 17
The air inside is pushed out by the supplied oil, and thereafter, the end of the connecting pipe 17 is connected to the clutch booster to complete the air bleeding.

As described above, the bypass passage 44 is connected to the cylinder 42.
When the air is removed from the connecting pipe 17, the oil is supplied from the oil reserve tank 16.
From the bypass path 44 provided in parallel with the valve 26
By allowing the oil to flow, the oil supply time to the connection pipe 17 can be reduced.

[0020]

[Effect of the invention] According to the present invention of the clutch master cylinder as described in detail by way of Examples, clutch
The push rod operated by the push rod
Ston and piston slide in the cylinder,
Generates hydraulic pressure to the clutch booster only through the connecting pipe
Supply to the oil reserve tank
And a hydraulic chamber communicated through the oil reservoir.
Connect the tank and the hydraulic chamber in parallel with the supply valve
And a bypass passage provided in the
Since an on-off valve is provided to open and close the passage , oil is supplied from the oil reserve tank to the supply
By allowing the oil to flow through the bypass provided in parallel with the lube , the oil supply time to the connecting pipe can be shortened, and the workability of the air bleeding operation can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a clutch master cylinder according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of clutch control.

FIG. 3 is a sectional view of a conventional clutch master cylinder.

[Explanation of symbols]

11 Clutch pedal 15 Push rod 16 Oil reservoir tank 17 Connecting pipe 18 Clutch booster 22 Piston 41 Clutch master cylinder 42 Cylinder 43 Port 44 Bypass path 45 Open / close valve

Claims (1)

(57) [Scope of request for utility model registration] A push lock interlocking with a clutch pedal;
Piston operated by the
The hydraulic pressure generated by sliding inside the clutch booth
To the oil reservoir only through the connecting pipe and the oil reservoir
Hydraulic pressure that is communicated to the supply tank via the supply valve
A clutch master cylinder equipped with a chamber, the O
Connecting the oil reserve tank and the hydraulic chamber
By installing a bypass that runs in parallel with the liver valve,
A clutch master cylinder provided with an on-off valve for opening and closing the bypass passage .