JPH0423093Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hydraulic actuation device used in a vehicle brake device or the like.

[Prior art]

Generally, in the brake system of automobiles, the pressure of the hydraulic fluid supplied from the master cylinder to the wheel cylinder side is set slightly higher than that of the atmosphere in order to prevent vapor lock or air from entering the brake system. Holds pressure. This pressure is called residual pressure, and the valve device for maintaining this residual pressure is a residual pressure valve.

Conventionally, hydraulic operating devices having this type of residual pressure valve include a hydraulic pressure generating device that generates hydraulic pressure by external operation, and a hydraulic pressure generating device that is connected to the hydraulic pressure generating device and generates hydraulic pressure. an actuator actuated by; a reservoir tank that forms a cavity for storing hydraulic fluid therein and supplies the hydraulic fluid to the hydraulic pressure generating device; and a reservoir tank that is formed in the reservoir tank and injects the hydraulic fluid into the cavity. a lid member that is removably attached to cover the inlet, a passageway that communicates a space in the reservoir tank with the hydraulic pressure generating device, and an actuation from the reservoir tank to the actuator Some devices are known that are equipped with a residual pressure valve that allows the flow of liquid and prohibits the opposite flow below a predetermined pressure.

Generally, when filling a hydraulically actuated device such as a brake device with hydraulic fluid, air within the hydraulically actuated device system is first sucked through the hydraulic fluid inlet of the reservoir tank of the hydraulic pressure generating device. However, in the hydraulic pressure generator having the residual pressure valve as described above, the residual pressure function of the residual pressure valve is activated, so that air from the hydraulic pressure actuator side cannot be sufficiently sucked from the residual pressure valve.

Therefore, as a hydraulic pressure actuating device for solving these drawbacks, there is one disclosed in, for example, Japanese Utility Model Publication No. 12027/1983. This hydraulic actuation device includes a one-way valve made of an elastic material such as rubber and having a flap-shaped lip, and a valve spring that urges the one-way valve toward the outlet side of the valve chamber that communicates with the actuator. It has a residual pressure valve configured. A support member is inserted through the lip portion in the axial direction of the one-way valve so as to be movable relative to the one-way valve. A locking portion is formed at the tip of the support member, and before the hydraulic fluid is injected, the lip portion of the one-way valve is locked in the locking portion against the biasing force of the valve spring.
The residual pressure function of the residual pressure valve can be canceled by opening a communication path for hydraulic fluid from the actuator to the hydraulic pressure generating device. This locking by the support member is not released by the biasing force of the valve spring, but by applying a predetermined hydraulic pressure from the hydraulic pressure generating device, the lip portion overcomes the locking portion, and the one-way valve and the support member The structure is such that it is released by relative movement.

Therefore, when suctioning air to fill the hydraulic fluid, the one-way valve is held by the support member to open the communication passage, so the air on the actuator side in the hydraulic actuator system is The air quickly flows through the communication path toward the hydraulic pressure generating device, and the air within the hydraulic pressure operating system is removed in a short period of time until a sufficient vacuum is created.

After that, when hydraulic fluid is injected from the hydraulic fluid inlet of the reservoir tank, the hydraulic fluid expands the lip of the one-way valve, flows through the communication passage, and is pumped to the end of the actuator. Ru. At this time, the pressure of the hydraulic fluid acts on the one-way valve, the one-way valve is unlocked by the support member, and the residual pressure function by the valve spring is thereafter activated.

[Problems with conventional technology]

In a conventional hydraulic actuator having a residual pressure valve, the one-way valve is locked to a support member to release the residual pressure function of the residual pressure valve until hydraulic fluid is pumped into the hydraulic actuator system. However, once the one-way valve is unlocked by the support member, it is difficult to release the residual pressure function again. It was hot. For this reason, when inspecting or repairing the hydraulic operating device system or replacing the hydraulic fluid, it was not possible to smoothly refill the hydraulic fluid. Another problem was that the one-way valve may be unlocked by the support member before being filled with hydraulic fluid due to impact during transportation or the like.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a hydraulic actuation device that can switch the function of a residual pressure valve between a released state and a non-released state with a simple operation.

[Means of the invention]

In order to achieve the above-mentioned object, the present invention enables a residual pressure valve to be disposed in a space in a reservoir tank or in a passage connecting a space in this reservoir tank and a hydraulic pressure generating device, and a lid member of a reservoir tank. The function of the residual pressure valve can be switched between released and non-released depending on the attachment and detachment of the residual pressure valve.

[Effect]

In the present invention, the function of the residual pressure valve can be canceled by removing the lid member of the reservoir tank from the reservoir tank, and the function can be restored to the residual pressure valve by attaching it.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 1, 1 is a brake device,
A reservoir tank body 2 of this brake device 1 has a cavity 3 for storing hydraulic fluid therein, and an injection port 4 for the hydraulic fluid at its upper end. Further, a piping connector 5 for connecting the piping 7 is attached to the lower end portion with the flange portion in contact with the bottom surface of the reservoir tank body 2, and is fixed with a nut 6. At the axial center of this piping connector 5,
An outlet passage 7 is formed, and the cavity 3 communicates with a pressure chamber (not shown) in the master cylinder 9 via the outlet passage 7 and piping 8. Further, the master cylinder 8 is connected to the foil cylinder 1 by the piping 10.
Connected to 1.

A lid member 12 is detachably attached to the injection port 4 so as to cover the injection port 4.
2 is provided with a support 13 extending into the cavity 3. In addition, several leg-like parts 32 (for convenience of drawing, only one is shown on the front) are integrally formed on the outer periphery of the lid member 12 facing downward, and these leg-like parts 32 An inward protrusion 33 is formed in each. This inward protrusion 33 is connected to a flange portion 3 formed at the inlet 4 of the reservoir tank body 2.
4 through the notch (not shown), and then rotate the lid member 12 while pressing it toward the reservoir tank body 2 so that the inner protrusion 33 is inserted into the flange 34.
The lid member 12 is reliably attached to the reservoir tank body 2 by elastically engaging with the lid member 12 .
16 is a casing that partitions the valve chamber 15 of the residual pressure valve 14 therein. A Daruma-shaped hole 17 having a large diameter part slightly larger than the diameter of the tip of the support column 13 and a small diameter part is opened in the upper end surface of the casing 16. The casing 16 is attached to the column 13 by inserting the tip of the column 13, sliding it toward the small diameter portion, and fitting the groove 18 formed at the tip of the column 13 into the small diameter portion of the hole 17. Note that by securely attaching the lid member 12 to the reservoir tank body 2, the lower end surface of the casing 16 is placed at a position opposite to the upper end surface of the nut 6. A valve body 21 is disposed inside the valve chamber 15, and this valve body 2
1 consists of a disc-shaped substrate 22 and an elastic body 23 formed in a cup shape so as to cover part of the side and bottom surfaces of this substrate 22. The small hole 24 is inserted into the elastic body 2.
A lip portion 25 formed at the bottom of 3 is closed to form a check valve. Reference numeral 26 denotes a seat portion which is formed in an annular shape and protrudes from the bottom surface of the elastic body 23, surrounding the valve port 27 that opens at the center of the bottom of the elastic body 23. Also,
The valve chamber 15 communicates with the cavity 3 through a communication hole 19 formed below the side of the casing 16 and a passage 20 formed between the inner surface of the casing 16 and the outer surface of the valve body 21. . The valve body 21 has a spring 2 whose one end engages with the upper end surface inside the casing 16.
8 toward the outlet passage 7 side.
As a result, the valve body 21 is seated on the valve seat 29 formed on the upper end surface of the nut 6, and
A passage 30 communicating with the outlet passage 7 is blocked. Note that the valve spring 2 is connected from the outlet passage 7 side.
8, the valve element 21 is separated from the valve seat 29, and the passage 30 is opened between the valve seat 29 and the bottom 26.
As a result, the cavity 3 and the outlet passage 7 are connected to the passage 3.
0 and through the communication hole 19. Furthermore, a flange-like locking portion 31 formed on the circumference of the lower end of the casing 16 locks the lower circumferential portion of the valve body 21 and prevents it from coming out of the casing 16 .

Next, a case in which the brake device is vacuum filled with hydraulic fluid will be described.

When vacuum-filling the brake system with hydraulic fluid, first draw a vacuum from the reservoir tank's injection port. In the present invention, when the lid member 12 attached to the inlet 4 of the reservoir tank 2 is removed by disengaging the flange portion 34 and the inner protrusion 33 when performing vacuuming, the struts provided on the lid member 12 are removed. 1
The casing 16 attached to the tip of the casing 16, the valve body 21 disposed within the casing 16, and the valve spring 28 are removed from the reservoir tank 2 as one body. At this time, the valve body 21 is locked by a locking portion 31 formed in the casing 17, so that it does not come out of the casing 16. Next, when a vacuum is drawn from the inlet 4 of the reservoir tank 2, the air from the master cylinder 9 and foil cylinder 11 side quickly flows through the piping 8, 10 and the outlet passage 7, and the air in the brake system is evacuated for a short time. Within a short time, sufficient suction will be generated and the brake system will be in a sufficient vacuum state. When this evacuation is completed, pressurized working fluid is injected from the inlet 4 of the reservoir tank 2 by the pump. Then, the working fluid passes through the outlet passage 7 and the pipes 8, 10 and is filled up to the ends of the master cylinder 9 and the foil cylinder 11. When the vacuum filling of the working fluid is completed, the lid member 12 is attached to the inlet 4 of the reservoir tank 2. At this time, the lid member 12 is pushed into the injection port 4 and rotated, and the leg-like portions 32
By engaging the inner protrusion 33 with the flange portion 34 of the reservoir tank body 2, the lid member 12 is prevented from coming off and is securely attached to the reservoir tank body 2. As a result, the pillar 13 of the lid member 12
The lower surface of the casing 16 attached to the nut 6 faces the valve seat 29 formed on the upper end surface of the nut 6,
The bottom part 26 of the valve body 21 inside the casing 16 is the valve seat 2
Take a seat at 9. Therefore, from now on, the residual pressure valve 14 has a residual pressure function.

Next, the operation when the brake is applied will be explained.

By depressing the brake pedal (not shown),
Working fluid in a pressure chamber (not shown) of the master cylinder 9 is sent to the foil cylinder 11 through a pipe 10 by movement of a piston (not shown). As a result, the wheel cylinder 11 is actuated, and a braking force is applied to the wheels of the vehicle. At this time, the communication between the pressure chamber (not shown) of the master cylinder 9 and the reservoir tank 2 is cut off, and the working fluid in the space 3 of the reservoir tank 2 remains unchanged.

After that, when the brake pedal (not shown) is released, the piston (not shown) in the master cylinder 9 returns to the non-operating position, but the return of the hydraulic fluid sent to the wheel cylinder 11 is delayed. Negative pressure is generated in a pressure chamber (not shown) inside the master cylinder 9. For this reason, the space 3
The hydraulic fluid within flows into the valve chamber 15 through the communication hole 19 and the passage 20 and acts on the valve body 21. When the bottom part 26 of the valve body 21 is seated on the valve seat 29, the passage 30 communicating the outlet passage 7 and the cavity 3 is blocked, but since hydraulic pressure acts on the lip part 25 through the small hole 24, this lip The portion 25 is expanded, and the hydraulic fluid flows from the valve port 27 through the outlet passage 7 to the piping 8, and is supplied to a pressure chamber (not shown) in the master cylinder 9.

Thereafter, when the working fluid sent to the foil cylinder 11 returns to a pressure chamber (not shown), the fluid pressure within the pressure chamber increases. The hydraulic pressure in the pressure chamber acts on the valve body 21 through the pipe 8 and the outlet passage 7, and urges the valve body 21 upward against the biasing force of the valve spring 28. At this time, the force due to the hydraulic pressure on the pressure chamber side is applied to the valve spring 28.
If the urging force is greater than the urging force, the valve body 21 moves upward,
A passage 30 communicating the outlet passage 7 and the cavity 3 is opened, and the working fluid on the pressure chamber side flows into the cavity 3. After that, when the hydraulic pressure on the pressure chamber side decreases to below a predetermined pressure set by the valve spring 28, the valve body 21 moves toward the outlet passage 7 side by the urging force of the valve spring 28, and the seat 26 of the valve body 21 moves to the side of the outlet passage 7. is seated on the valve seat 29. This closes the passage 30 and blocks communication between the cavity 3 and the outlet passage 7. As a result, a constant residual pressure set by the valve spring 28 is maintained in the brake system on the master cylinder 9 and wheel cylinder 11 side, preventing vapor lock from occurring in the brake system and air from entering. can.

In this embodiment, the residual pressure valve 14 can be adjusted by removing the lid member 12 of the reservoir tank 2.
Since the casing 16, the valve body 21 and the valve spring 28 disposed inside the casing 16 are removed from the reservoir tank 2 together with the lid member 12, the function of the residual pressure valve 14 can be easily released or not released. You can switch to . Then,
When repairing/inspecting the brake system or replacing the hydraulic fluid,
You can easily fill the hydraulic fluid. Furthermore, there is no malfunction caused by impact or the like.

In the above embodiment, by removing the lid member 12 from the reservoir tank 2, the casing 16 of the residual pressure valve 14, the valve body 21 and the valve spring 28 disposed inside the casing 16 are removed from the reservoir tank 2 integrally with the lid member 12. Although the valve spring 28 is designed to be easily removed from the reservoir tank 2, a structure may be adopted in which only the valve spring 28 is removed integrally with the cover member 12 when the cover member 12 is removed from the reservoir tank 2. Furthermore, although the residual pressure valve 14 is disposed within the space 3 of the reservoir tank body 2, it may also be disposed within a passage connecting the reservoir tank 2 and the master cylinder 9.

〔effect〕

As explained above, the present invention makes it possible to install a residual pressure valve in the cavity inside the reservoir tank or in the passage connecting this cavity and the hydraulic pressure generating device, and when the lid member of the reservoir tank is removed from the reservoir tank. The structure is such that the function of the residual pressure valve is canceled, so
The function of the residual pressure valve can be easily switched between released and non-released states. Therefore, for example, when repairing/inspecting the brake device or replacing the hydraulic fluid, it is possible to easily vacuum-fill the hydraulic fluid again. In addition, since the residual pressure function of the residual pressure valve is canceled only when vacuuming, there is no error movement due to impact during transportation.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part showing an embodiment of the present invention. 1...Brake device, 2...Reservoir tank,
3...Vacancy, 4...Inlet, 5...Outlet passage, 9
...Master cylinder, 11 ...Foil cylinder,
12... Lid member, 14... Residual pressure valve, 21... Valve body.

Claims (1)

[Scope of utility model registration request] A hydraulic pressure generating device that generates hydraulic pressure by external operation, an actuator connected to the hydraulic pressure generating device and operated by the hydraulic pressure generated by the hydraulic pressure generating device, and a space for storing hydraulic fluid inside. a reservoir tank forming a space and supplying hydraulic fluid to the hydraulic pressure generating device; an injection port formed in the reservoir tank for injecting hydraulic fluid into the cavity; and a removably attached device that closes the injection port. a lid member that connects a cavity in the reservoir tank with the hydraulic pressure generating device; In the hydraulic operating device, the residual pressure valve can be disposed in a space in the reservoir tank or in the passage, and the function of the residual pressure valve is released in response to attachment and detachment of the lid member. Or a hydraulically actuated device that can be switched to a non-released state.