JPH0416766Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a valve structure of a quick-filling master cylinder, more specifically, a system for controlling the communication state between a pressure cylinder and a reserve tank in a quick-filling master cylinder. The present invention relates to the structure of a valve device provided for the purpose of

[Prior Art] As is well known, in order to meet the demand for vehicle weight reduction in master cylinders mainly used in braking systems of vehicles such as automobiles, thin-walled cylindrical master cylinders have been developed in contrast to the conventional metal integral type. A pressure cylinder made of metal and a reserve tank made of a lightweight material such as synthetic resin are manufactured separately, and the reserve tank is mounted on the pressure cylinder, and
A so-called assembled master cylinder is well known in which a reserve tank and the inside of a pressure cylinder are communicated through a communication port provided on a side wall of the pressure cylinder.

However, in order to improve responsiveness during vehicle braking operations, a large amount of brake fluid is quickly flowed into the braking system when the brake pedal is depressed, thereby minimizing the amount of brake pedal depression required to brake the vehicle. In the case of a so-called quick-filling master cylinder, the pressure between this replenishment oil chamber and the reserve tank is determined according to the pressure in the replenishment oil chamber provided behind the piston to supply braking fluid to the pressure chamber of the cylinder. A valve arrangement is provided to control the communication state.

This valve device prevents the brake fluid from flowing back from the cylinder side to the reserve tank until the pressure on the cylinder side reaches a predetermined value, and when the pressure on the cylinder side exceeds the predetermined value, the brake fluid in the cylinder side is removed. A valve mechanism (hereinafter referred to as the first valve mechanism) that releases pressure into a reserve tank to relieve pressure and prevent the pressure in the braking system from rising excessively beyond a predetermined value; When negative pressure occurs, the valve mechanism (hereinafter referred to as the second valve mechanism) quickly guides and replenishes the brake fluid from the reserve tank to the cylinder side.
(referred to as a valve mechanism).

Conventionally, a sealing member made of a highly elastic material such as rubber is used for the valve body of the second valve mechanism, and the pressure between the reserve tank side and the cylinder side due to negative pressure on the cylinder side is used. The elastic deformation of the seal member caused by the difference is used to open the second valve mechanism, and brake fluid is supplied from the reserve tank to the cylinder side (for example,
-Refer to Publication No. 148750).

The above valve device is installed at the connection between the reserve tank and the cylinder in an assembled master cylinder, so it must be installed between the two mounting points to prevent brake fluid from leaking outside from this connection. It is necessary to provide a fixed seal member attached to the outer periphery of the main body of the valve device in order to isolate the reserve tank side and the cylinder side of the valve device.

[Problems to be solved by the invention] However, conventionally, the sealing member forming the valve body of the second valve mechanism and the two fixed sealing members are provided separately, so that the reserve tank and the cylinder cannot be connected to each other. There was a problem in that the structure of the connecting part became complicated and the workability during assembly was poor.

[Purpose of the invention] This invention was made to solve the above problems, and by devising the sealing member that forms the valve body of the second valve mechanism, the structure of the connection between the reserve tank and the cylinder can be improved. An object of the present invention is to provide a valve structure for a quick-filling master cylinder that can simplify the process and improve workability during assembly.

[Means for Solving the Problem] Therefore, this invention has an upper flange portion having a valve seat portion, a lower flange portion located below the upper flange portion, and a leg portion extending downward from the lower flange portion. and a valve body that is urged in a valve closing direction by a spring and combined with the valve seat, and a lower flange portion, an upper flange portion, a valve body, and a spring of the valve body. In a valve device for a quick-filling master cylinder, the valve device is stored in a storage portion formed at the bottom of a reserve tank, and the leg portions are inserted into a mounting portion of a cylinder body. , an intermediate portion extending upward from the fixing portion, and a lip portion extending inwardly and slightly upward from the intermediate portion, and integrally formed using a highly elastic member, the fixing portion is installed between the inner periphery of the mounting part of the cylinder body and the outer periphery of the leg of the valve body, and the intermediate part is installed between the inner periphery of the storage part of the reserve tank and the outer periphery of the lower flange part. , the lip portion is disposed in a space formed between an upper flange portion and a lower flange portion.

[Effects of the invention] According to this invention, in a valve device for a quick-filling master cylinder, by providing a fixed portion, an intermediate portion, and a lip portion in the sealing member of the valve device, the attachment portion between the reserve tank and the cylinder can be improved. The fixed seal member installed on the main body of the valve device, the fixed seal member attached to the outer periphery of the main body of the valve device, and the valve body of the second valve mechanism of the valve device are shared by the above-mentioned one seal member. The structure of the connecting portion between the tank and the cylinder can be simplified, and the workability when assembling the reserve tank and the cylinder can be improved.

[Example] Hereinafter, an example of this invention will be described in detail based on the accompanying drawings.

As shown in FIG. 2, a ball-shaped valve body 4 and a valve body 4 assembled with the valve body 4 are provided at the connection portion between the cylinder body 21 of the master cylinder and the reserve tank 22 installed above the cylinder body 21. A valve device 23 is provided that includes a valve body 26 having a valve seat portion 5 to be fitted together, and a plate-shaped spring 7 that biases the valve body 4 in the valve closing direction.

The valve body 26 has a hollow cylindrical leg portion 31 inserted into the chamber 8 provided in the mounting boss portion 21a of the cylinder body 21, and a lower flange portion 22.
It is provided to protrude downward from 6b.

All other structural parts of the valve device 23 except for the legs 31 are housed in a housing 22a formed at the bottom of the reserve tank 22.

A valve body 26 is provided on the side wall of the housing 22a.
The lower flange portion 26b and the upper flange portion 26a of
Slits 13 are provided at a plurality of locations on the circumference in order to communicate between the space 32 formed between the space 32 and the inside of the reserve tank 22.

Further, a plate-shaped spring 7 is attached to the spring chamber 14 formed between the housing 22a and the upper flange portion 26a of the valve body 26, and urges the ball-shaped valve body 4 downward. It is pressed against the valve seat portion 5. The spring chamber 14 communicates with the inside of the reserve tank 22 through a relief passage 15.

The valve body 4 is closed by the urging force of the spring 7 until the pressure on the cylinder side reaches a predetermined value,
This prevents the backflow of brake fluid from the cylinder side to the reserve tank 22 by blocking the gap between the cylinder side and the reserve tank 22, and opens against the biasing force of the spring 7 when the pressure on the cylinder side exceeds a predetermined value. A first valve that connects the cylinder side and the reserve tank 22 to release excess brake fluid on the cylinder side into the reserve tank 22 to prevent the pressure in the brake system from excessively increasing beyond a predetermined value. It plays the role of the valve body of the mechanism.

By the way, the valve device 23 according to the present embodiment includes a fixed seal member installed between the cylinder body 21 and the reserve tank 22 in order to prevent the brake fluid from leaking to the outside from the connecting portion between the two, and a valve device. A fixed seal member for isolating the reserve tank side and the cylinder side of No. 23, and a valve body of the second valve mechanism that quickly guides and replenishes the brake fluid from the reserve tank side to the cylinder side when the cylinder side becomes negative pressure. One seal member 36 is used in common.

This seal member 36 will be explained below.

As shown in detail in FIG.
These include a fixed portion 36a, an intermediate portion 36b extending upward from the fixed portion 36a, and a lip portion 36c extending slightly upward toward the inside from the intermediate portion 36b.
It is integrally formed using a highly elastic material such as rubber.

More preferably, the fixing portion 36a is provided with a circumferential groove 36d at its lower end so that it can be easily elastically deformed in the radial direction, and a groove 21b provided in the mounting boss portion 21a of the cylinder body 21.
is attached to the lower flange portion 26b of the valve body 26.
A liquid-tight seal is provided between the outer circumferential portion of the leg portion 31 that protrudes downward from the mounting boss portion 21a and the inner circumferential portion of the mounting boss portion 21a.

Further, the intermediate portion 36b is connected to the lower flange portion 2.
6b and the inner circumference of the housing 22a to provide a liquid-tight seal between the two.
The reserve tank side of No. 3 and the cylinder side are cut off.

Further, the lip portion 36c is located within the space 32 formed between the upper flange portion 26a and the lower flange portion 26b, and acts as a valve body of the second valve mechanism of the valve device 23.

That is, under normal conditions when positive pressure acts on the cylinder side, it is pressed against the lower surface of the upper flange portion 26a of the valve body 26, and when the cylinder side becomes negative pressure, the pressure difference between the inside of the reserve tank 22 and the cylinder side causes pressure to be applied to the cylinder side. As shown by the broken line in FIG. 2, it bends elastically to form a flow path between the upper flange portion 26a and the lower surface of the upper flange portion 26a, and as shown by the arrow a in the same figure, the flow path is formed in the reserve tank 22. The brake fluid is guided to the cylinder 21 side.

As described above, according to this embodiment, the valve device 2 is installed at the connection between the cylinder body 21 and the reserve tank 22 of the quick-filling master cylinder.
Regarding the seal member 36 of No. 3, by integrally forming the fixing part 36a, the intermediate part 36b, and the lip part 36c, it can be provided at the attachment part of the cylinder body 21 and the reserve tank 22, which were conventionally provided separately. Fixed seal member and valve device 2
Since the fixed seal member 36 that isolates the reserve tank side and the cylinder side of 3 and the valve body of the second valve mechanism of the valve device 23 can be shared by one seal member 36, the cylinder body 21 and The structure of the connecting portion with the reserve tank 22 can be simplified, and the workability when assembling the cylinder body 21 and the reserve tank 22 can be improved.

In the above embodiment (hereinafter referred to as the first embodiment), the seal member 36 was integrally formed of an elastic member such as rubber. Therefore, the lip portion 36
c has low rigidity, so the upper flange portion 26
There is a disadvantage that when pressed against the lower surface of a, it is likely to be damaged at the boundary of the small groove 37 provided in a part of the lower surface.

To solve this problem, the rigidity of the lip can be improved to the extent that it does not impair the function of the second valve mechanism as a valve body by embedding a member with a certain degree of rigidity, such as a thin iron plate, in the lip. ,
This can be resolved.

A sealing member according to a second embodiment of this invention will be described below.

As shown in FIGS. 4 and 5, a rigid member 43 made of, for example, a thin iron plate is embedded inside the lip portion 42 of the seal member 41 according to this embodiment. As shown in FIG. 3, the rigid member 43 has a large number of radial grooves 44 formed therein. An elastic member 45 made of, for example, rubber is coated along the shape of the rigid member 43.

According to the second embodiment, since the rigid member 43 is embedded inside the lip portion 42 of the seal member 41, the rigidity of the lip portion 42 can be improved, and the lower surface of the upper flange portion 26a can be improved. Damage at the boundaries of the small grooves 37 provided in some parts can be significantly reduced. In addition, the rigid member 43
A large number of radial grooves 44 are provided in the elastic member 4.
5 along the shape of the groove 44, the groove 44 is provided on the fluid passage surface of the lip 42, and the liquid replenishment property is improved when the valve body (rip 42) of the second valve mechanism opens. can be improved.

In the second embodiment, the lip portion 42 of the sealing member 41 is provided with a large number of linear grooves 44 in the radial direction.
Although the liquid replenishment property is improved by providing a lip, on the contrary, a groove can be formed by providing a large number of protrusions on the lip.

A sealing member according to a third embodiment of this invention will be described below.

As shown in FIG. 6, the seal member 51 according to this embodiment includes a protrusion 52 on its fluid passage surface. The protrusions 52 are preferably aligned in the radial direction, and recesses are formed relative to each other between the protrusions 52, so that a large number of grooves 53 are formed.

[Brief explanation of the drawing]

The drawings are all for explaining embodiments of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a sealing member according to the first embodiment, and FIG. 2 is a longitudinal cross-sectional view of a valve device according to the first embodiment. 3 is a front view of the sealing member according to the second embodiment as seen from the fluid passage surface side of the lip portion, and FIG. 4 is a front view of the seal member according to the second embodiment, and FIG. The cross-sectional view shown in Fig. 5 is “Y” - “Y” from Fig. 3.
FIG. 6 is a cross-sectional view taken along a line, and a front view of the sealing member according to the third embodiment as viewed from the fluid passage surface of the lip portion. 21... Cylinder body, 22... Reserve tank, 22a... Housing, 23... Valve device, 4
... Valve body, 5 ... Valve seat portion, 26 ... Valve body, 26
a... Upper flange part, 26b... Lower flange part, 7... Spring, 32... Space part, 36,
41, 51... Seal member, 36a... Fixing part,
36b... middle part, 36c, 42... lip part.

Claims (1)

[Claims for Utility Model Registration] A valve body including an upper flange portion having a valve seat portion, a lower flange portion located below the upper flange portion, and leg portions extending downward from the lower flange portion, and a spring. A storage tank comprising a valve element that is urged in a valve closing direction and combined with the valve seat part, and a lower flange part, an upper flange part, a valve element, and a spring of the valve body are formed at the bottom of the reserve tank. In a valve device for a quick-filling master cylinder, the leg portion is inserted into a mounting portion of a cylinder body, and the sealing member of the valve device is connected to a fixed portion and extends upward from the fixed portion. and a lip portion extending inwardly and slightly upwardly from the intermediate portion, and are integrally formed using a highly elastic member, and the fixing portion is connected to the inner periphery of the mounting portion of the cylinder body. The intermediate part is installed between the outer periphery of the leg of the valve body, and the intermediate part is installed between the inner periphery of the storage part of the reserve tank and the outer periphery of the lower flange part, and the lip part is attached between the upper flange part and the lower flange part. A valve structure for a quick-filling master cylinder, characterized in that the valve is disposed in a space formed between the valve structure and the valve structure.