JPS6232130Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device for a master cylinder used in a brake or clutch device of a vehicle or the like.

Conventionally, as a valve device placed between a hydraulic pressure generating chamber formed inside a master cylinder and an actuator connected to this hydraulic pressure generating chamber, a valve member is oriented toward a valve seat by a relatively light spring. Either the actuator is energized and some residual pressure is generated on the actuator side, or a throttle passage is provided in the valve seat or valve member to provide resistance to fluid movement from the actuator side to the master cylinder side. A type is used that allows liquid to freely move from the side to the actuator side.

Such a valve device is installed as a resistance against the hydraulic fluid or air discharged from the hydraulic pressure generating chamber into the piping system flowing back into the hydraulic pressure generating chamber during the air bleeding operation when the master cylinder is mounted on an actual vehicle.

However, when such a valve device is used, it is often installed inside the discharge part of the master cylinder, and although the valve device itself is not very large,
Problems arise when the structure of the discharge section becomes complicated and large.

Therefore, recently, instead of providing such a valve device, it has been proposed to reduce the area of the passage in a part of the passage of the discharge portion to form a throttle passage.

However, in such a throttle passage, the area of the throttle passage is constant and the throttle effect is different when the fluid moves from the master cylinder side to the actuator side and when the fluid moves from the actuator side to the master cylinder side. If you set the throttle based on the resistance to the master cylinder side, the discharge speed during actual use will be slow and quick operation will not be possible. If this setting is made, there is a problem that the workability during air purge work will be reduced.

The present invention was made in view of the above-mentioned problems, and was made for the purpose of providing a valve device for a master cylinder that enables both quickness in air purge work and quickness in actual operation. In order to achieve this, a passage connecting the hydraulic pressure generating chamber formed inside the master cylinder to the actuator via piping has a small hole formed through a step on the side of the hydraulic pressure generating chamber. a stepped hole into which a piping fitting having a through hole is inserted and fixed on the actuator side, and a communication passage connecting the small hole and the through hole;
A movable body having a protrusion that fits freely in and out of the small hole and forms a throttle passage when the movable body enters the small hole is provided, and the movable body is connected to the stepped portion and the piping connector according to fluid movement. The stepped hole is arranged so as to be movable between the stepped holes.

By doing so, when fluid flows from the actuator side to the hydraulic pressure generating chamber side, the movable body moves toward the step portion and the protrusion enters the small hole, forming a throttle passage and increasing the flow resistance against the fluid flow; when fluid flows from the hydraulic pressure generating chamber side to the actuator side, the movable body moves toward the pipe connector side and the protrusion exits the small hole, so that a throttle passage is no longer formed;
The flow resistance to the fluid movement is small.

Therefore, according to the present invention, the amount of fluid returned to the master cylinder side during air removal can be reduced to quickly complete the work, and the amount of fluid discharged per unit time can be increased during operation. , the speed of actuating the actuator can be improved. Furthermore, even if foreign matter enters the throttle passage, the foreign matter will also come out of the throttle passage as the protrusion comes out of the small hole due to the movement of the movable body toward the piping connector. This has the effect of preventing the eyelids from becoming stuck.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The master cylinder valve device of the present invention will be explained in detail below based on illustrated examples.

FIG. 1 is a cross-sectional view of only the discharge portion of a master cylinder according to an embodiment of the present invention.

In Fig. 1, the discharge part of the master cylinder is 1
The discharge portion 1 is formed with a stepped hole 2 whose right end opens into a hydraulic pressure generating chamber (not shown) and whose left end opens toward the outside.

The stepped hole 2 includes a large hole portion 4 having a threaded portion 3 formed at the end of the hole, a medium hole portion 6 formed continuously with the large hole portion 4 via an oblique step portion 5, and an oblique step portion 5. It has a small hole part 8 formed continuously to the middle hole part 6 via the row step part 7.

A tube sheet 9 is fitted and disposed astride the large hole 4 and the medium hole 6, and the tube sheet 9 has a small diameter portion 10 that is press-fitted into the medium hole 6;
It has a large diameter part 12 to which a corner part 11 is crimped to the oblique step part 5, and a tapered surface 13 is formed on the left peripheral edge of the large diameter part 12 to which a tapered surface of a pipe (not shown) is crimped. It has been done. The tapered surfaces are crimped together by screwing a conventionally known flare nut into the threaded portion 3 of the large hole 4. The tube seat 9 is further formed with an axial through hole 14, and an increased diameter portion 15 is formed at the end of the small diameter portion 10 via a stepped portion.

A shuttle 16 made of synthetic resin is movably inserted into the hollow part 6, and the shuttle 16 has a substantially cylindrical shaft part 17 and a plurality of shafts extending in the radial direction and spaced at appropriate intervals in the circumferential direction. It has plate parts 18, and a sufficient gap 19 is formed between the plate parts 18.

Adjustment parts 20 and 21 are formed at one end and the other end of the shaft part 17, which is longer than the axial length of the plate part 18, and these adjustment parts 20 and 21 have the same shape, but the adjustment part on the right side When the part 20 is fitted into the small hole part 8, it forms a throttle passage 22 between the inner circumferential surface of the small hole part 8 and the outer circumferential surface of the adjustment part 20. The section 21 is the shuttle 16
When the plate portion 18 and the end surface of the tube seat 9 come into contact with each other and are fitted into the increased diameter portion 15 of the tube seat 9, there is sufficient space between the inner peripheral surface of the increased diameter portion 15 and the outer peripheral surface of the adjustment portion 21. It is designed to ensure a sufficient passage area.

Such a shuttle 16 constitutes the main part of a variable device for changing the flow resistance, and the shuttle 16,
The tube seat 9 and the stepped hole 2 constitute a master cylinder valve device.

The effects of the embodiments described above will be described below.

During air removal work after the master cylinder is installed on an actual vehicle, a pedal (not shown) is depressed several times. Then, in response to the depression of the pedal, air and hydraulic fluid are discharged from the fluid pressure generation chamber side to the piping side, and in response to the movement of these fluids, the shuttle 1
6 moves to the left so that the plate part 18 is attached to the tube seat 9
At the same time, the adjustment part 20 comes out of the small hole part 8, and the passage area of the throttle passage 22 becomes extremely large. It is discharged through the hole 14 without restriction. Furthermore, in response to the return of the pedal, the fluid now attempts to flow back toward the hydraulic pressure generation chamber, but the plate portion 18 of the shuttle 16 moves to a position where it comes into contact with the diagonal step portion 7, and the throttle passage 22
By minimizing the area of the passage, the flow rate of the fluid attempting to flow back is reduced by the throttling effect of the throttling passage 22, and the entire flow rate returning to the hydraulic pressure generating chamber is reduced. These shuttles16
As this movement is repeated in response to several pedal depressions, the total flow rate of fluid movement towards the actuator side and the total flow rate of fluid movement towards the hydraulic pressure generation chamber side are extremely large. The latter becomes extremely small, and the number of times the pedal is depressed during the air purge operation can be reduced, thus improving the workability of the air purge operation and shortening the time required for the work.

In addition, during actual use after the air purge work is completed, the fluid movement toward the actuator is performed by moving the shuttle 16 to a position where the passage area of the throttle passage 22 is maximized in the same way as in the case described above. So,
Discharge occurs quickly and the actuator operates quickly and has good response.

The above embodiments have the following effects in addition to the effects of improving the speed of air purge work and the speed of discharge during operation, as described above.

That is, the shuttle 1 is placed in the stepped hole 2 of the discharge part 1.
6 and press-fitting the tube seat 9 forms a master cylinder valve device, so the structure is small and simple. shuttle 16
Since it is symmetrical, the right and left sides can be assembled in reverse without interfering with workability in the assembly process. Furthermore, even if foreign matter mixed in the fluid enters the throttle passage 22 when the shuttle 16 is located on the side of the oblique stepped portion 7, when the fluid is delivered to the actuator side, the shuttle 16 moves to the tube seat 9.
Since the adjusting part 20 is moved to the side and comes out of the small hole part 8, the foreign matter also comes out of the throttle passage 22 and does not remain clogged in the throttle passage 22.

It should be noted that the present invention is not limited to the illustrated example and can be implemented in various ways. For example, the shape of the shuttle 16 may be partially modified to have a disk-shaped portion extending in the radial direction in order to increase responsiveness to fluid flow. Alternatively, a ball-shaped member may be used.In short, the flow resistance may be changed according to the above-mentioned relationship, or it may be provided separately from the discharge portion.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of only the discharge portion of a master cylinder according to an embodiment of the present invention. 2...Stepped hole, 7...Diagonal step, 8...Small hole, 9...Tube seat, 16...Shuttle,
20...adjustment section, 22...throttle passage.

Claims (1)

[Scope of utility model registration request] It is placed in a passage that connects the hydraulic pressure generating chamber formed inside the master cylinder to the actuator via piping, and has greater flow resistance to fluid movement toward the master cylinder than fluid movement toward the actuator. In the master cylinder valve device, a piping fitting having a small hole formed on the hydraulic pressure generating chamber side through a step and a through hole formed on the actuator side is inserted and fixed into the passage. A movable movable device having a stepped hole, a communication passage connecting the small hole and the through hole, and a protrusion that fits into the small hole so as to be freely removable and forms a throttle passage when entering the small hole. A master cylinder valve device comprising: a movable body disposed within the stepped hole so as to be movable between the stepped portion and the piping connector according to fluid movement.