JPH08142828A - Anti-lock brake device - Google Patents

Abstract

PURPOSE: To reduce kickback and reduce the rising rate at the time of pressurization for anti-lock control by communicating the master cylinder side and the wheel cylinder side with the orifice of a coupling seal presser only at the time of the decompression of the wheel cylinder side brake liquid. CONSTITUTION: The valve seat for the valve element of a hold valve 12 is formed at the end section of the passage 16 of a valve seat main body 14 held on a sleeve by a holder 15, and a flow path and a wheel cylinder WC are invariably communicated by a passage 15a and a filter 15b. The first and second plates, a spring, and a cup seal 18-21 are provided between the outer periphery of the valve seat main body 14 and a housing 23. A spring 24 is arranged between the housing 23 and a slidable cup seal presser 22. When the cup seal presser 22 is completely coupled with the valve seat main body 14, a hole 25 on the outer periphery is closed, and a projection 26 and an orifice 17 secure the flow of a master cylinder MS and the wheel cylinder WC. Slow pressurization at the time of anti-lock control is implemented, kickback is prevented, and the pressurization delay at the time of normal braking can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-lock brake device, in particular, there is no pressurization delay when it is not operated, and it is possible to improve controllability and reduce pedal kickback during operation. It is about.

[0002]

2. Description of the Related Art Conventionally, many modified examples of an antilock brake device have been known. For example, JP-A-5
As shown in FIG. 6, the anti-lock brake device disclosed in Japanese Patent Laid-Open No. 116607 has a hydraulic pump 50, a reservoir 51, wheel brake hydraulic pressure control valves 52 and 53, a traction control valve 54, and an intermediate valve in a brake circuit. A fluid reservoir 55, a buffer fluid reservoir 56, a throttle 60, etc. are provided, and during normal braking, the wheel brake fluid pressure control valves 52, 53,
The traction control valve 54 occupies the position shown in the figure, and the hydraulic pressure from the master cylinder is directly supplied to the brake 57. When the antilock control is started, the wheel brake hydraulic pressure control valves 52 and 53 are switched by a command from an electronic control unit (not shown), and at the same time, the hydraulic pump 50 sucks the brake fluid from the reservoir 51. To reduce the hydraulic pressure in the brake 57,
It can hold and pressurize to avoid wheel lock. Further, in this device, when traction control for preventing wheel slip at the time of starting is started, the traction control valve 54 is closed, and at the same time as this, the hydraulic pump 50 causes the intermediate liquid reservoir 55 and the reservoir 51.
Brake fluid is sucked from the wheel brake fluid pressure control valve 5
Wheel slip can be prevented by supplying the brakes via 2, 53. At the time of the antilock control and the traction control described above, the wheel brake hydraulic pressure control valves 52 and 53 are switched and controlled to obtain an optimum brake hydraulic pressure.

[0003]

By the way, in order to prevent the pulsation of the brake fluid (so-called kickback) that occurs during the antilock control, the above-mentioned device is provided between the master cylinder and the wheel brake fluid control valves 52 and 53. A fixed orifice 60 is provided in the above, and the fixed orifice 60 prevents the pulsation of the brake fluid generated during the antilock control from being transmitted to the brake pedal.

However, since the fixed orifice 60 is normally provided in the brake circuit as described above, the brake fluid from the master cylinder is always supplied to the brake through the fixed orifice 60 even during non-antilock control. As a result, the pedal reaction force is large during normal braking, which may give the driver a feeling of strangeness.

Therefore, according to the present invention, an orifice is formed in the supply passage only in the anti-lock control in the wheel brake hydraulic pressure control valve in which the hold valve and the decay valve which are conventionally used are integrated, and the pulsation of the brake hydraulic pressure is generated. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by providing an antilock brake device that incorporates a mechanism capable of absorbing the above to reduce kickback and reduce the rate of increase during pressurization during antilock control.

[0006]

Therefore, an anti-lock brake device according to the present invention is an anti-lock brake device that performs anti-lock control by opening / closing control of a hold valve and a decay valve. An orifice forming mechanism capable of forming the orifice 17 only at the time of lock control is arranged. The orifice forming mechanism has a passage 16 for communicating the master cylinder and the wheel cylinder in the central portion and a hold valve valve seat 12b at one end. Valve seat body 14
A cup seal 21 slidably arranged on the outer periphery of the valve seat body, on one end of which hydraulic pressure on the master cylinder side acts, and on the other end, hydraulic pressure of the wheel cylinder side, and a valve seat body 14
A hole 25 that is slidably disposed at the other end of the valve seat and normally connects the master cylinder side and the passage in the valve seat body to block the communication with the passage as the cup seal moves; A cup seal retainer 22 having an orifice 17 communicating the passage and the master cylinder and configured so that brake fluid pressure always acts from the master cylinder side, and the cup seal 21 is attached to the cup seal retainer 22. When the brake hydraulic pressure on the wheel cylinder side is reduced, the cup seal retainer and the cup seal are moved by the hydraulic pressure on the master cylinder side to move the master cylinder side and the wheel cylinder side. It is characterized in that it is configured to communicate only with the orifice 17 formed in the cup seal holder,

Further, in an anti-lock brake device for performing anti-lock control by controlling opening / closing of a hold valve and a decay valve, a solenoid valve 3 in which the hold valve and the decay valve are integrally incorporated,
A valve seat main body 14 forming a valve seat of a hold valve provided in the solenoid valve, and a master cylinder side hydraulic pressure acting on one end of the valve seat main body 14 slidably arranged on the outer periphery of the valve seat main body The cup seal 21 on which hydraulic pressure is applied on the wheel cylinder side and the other end of the valve seat body 14 are slidably arranged to normally communicate the master cylinder side with the passage in the valve seat body to move the cup seal. Along with this, there is provided a hole 25 for shutting off communication with the passage, an orifice 17 for communicating the valve seat main body internal passage 16 with the master cylinder at all times, and a brake fluid pressure from the master cylinder side is always applied. The cup seal retainer 22 and the spring 19 that urges the cup seal toward the cup seal retainer reduce the brake fluid pressure on the wheel cylinder side. At this time, the cup seal retainer and the cup seal are moved by the hydraulic pressure on the master cylinder side, and the master cylinder side and the wheel cylinder side are configured to communicate only with the orifice formed in the cup seal retainer. The hydraulic pressure from the master cylinder side is supplied to the wheel cylinder side via the orifice 17 at the time of slow pressurization during the antilock control, and the kickback can be prevented from occurring.

[0008]

[Action]

[In normal braking state] Brake fluid from the master cylinder is applied to the orifice 1 formed in the cup seal holder 22.
7 to the passage 16 of the valve seat body, and the gap between the projection 26 of the cup seal retainer 22 and the housing →
It is supplied into the passage 16 through the hole 25, and the passage 16
→ Open hold valve 12 → Holder 15 passage 1
5a → Supplied to the wheel cylinder through the filter 15b, and the braking force acts. Since the brake fluid from the master cylinder is supplied through the orifice 17 and the hole 25, the brake fluid is supplied to the wheel cylinder without being affected by the resistance of the orifice 17, so that the brake can be operated without delay in pressurization.

[During Antilock Control] During the antilock operation, when the hold valve is opened and the pressure is gradually increased, the wheel cylinder side is depressurized, and the cup seal retainer 22 resists the urging force of the spring 19 by the hydraulic pressure of the master cylinder. Move to the left in the figure together with the cup seal 21 and the second plate 20 to close the hole 25. As a result, at the time of slow pressurization during antilock control, the hydraulic pressure from the master cylinder side flows into the passage 16 only through the orifice 17, and the open hold valve 12 → passage 15a of the holding body 15 → filter 15b. Since it is supplied to the wheel cylinder via the, it is possible to suppress the rising rate at the time of pressurization during the antilock control to be low. Also,
Brake fluid pressure pulsation generated during antilock control is
As shown in FIG. 5, since the spring 19 is bent via the cup seal holder 22 and the cup seal 21, the spring 19 can absorb the spring.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an antilock brake device according to an embodiment of the present invention. The figure shows a master cylinder and 1
A brake piping system for connecting to individual wheel cylinders is shown, and piping systems for other wheel cylinders have the same configuration. Further, the electronic control device for controlling the valve is the same as the conventional one, and therefore the description thereof is omitted here.

In the figure, 1 is a master cylinder (M /
C) connection port, 2 is a wheel cylinder (W / C) connection port, 3 is a solenoid valve in which a normally-open hold valve and a normally-closed decay valve are integrated, and 4 has a known configuration. The hydraulic pumps 5 are reservoirs, the suction port 4a of the hydraulic pump 4 is connected to the solenoid valve 3 and the reservoir 5, and the discharge port 4b of the hydraulic pump 4 is connected to the master cylinder. It is in communication.
These piping systems are similar to the conventional antilock control device.

In this device, the hold valve is open and the decay valve is closed during normal braking. Therefore, the hydraulic pressure from the master cylinder can be supplied to the wheel cylinder via the hold valve to apply the brake. On the other hand, when the anti-lock control is started and the decay valve and the hold valve are controlled to open and close, the hydraulic pump 4 is driven at substantially the same time as the hydraulic pump 4 from the suction port 4a to the reservoir 5 or the open decay valve 3 is opened. The brake fluid is sucked from the wheel cylinder through the wheel cylinder, and is returned to the master cylinder or the hold cylinder for re-pressurization to the wheel cylinder.
The operation of the hydraulic pump 4 and the hold valve,
Since the opening / closing timing of the decay valve is conventionally known and is not a feature of the present invention, detailed description thereof will be omitted here.

The structure of the solenoid valve 2 described above will be described with reference to FIGS. 2 and 3. FIG. 2 is a plan sectional view of the solenoid, and FIG. 3 is an enlarged view of a main portion thereof. In the figure, the solenoid valve 3 includes a cylindrical sleeve 10, and a decay valve 11 and a hold valve 12 are housed in the sleeve 10. A flow path 13 communicating with a wheel cylinder (W / C) is formed on the outer circumferences of the decay valve 11 and the hold valve 12, and the decay valve 11 opens the valve body 11a according to a command from an electronic control unit (not shown). Flow path 1 by separating and contacting 11b
3 and the suction port 4a of the hydraulic pump 4 are connected and disconnected. Similarly, the hold valve 12 is also a valve seat 12 in which the valve body 12a is formed in the valve seat body 14 according to a command from an electronic control unit (not shown).
It has a known structure in which the flow path 13 and the master cylinder (M / C) are connected to and separated from b.

The valve seat main body 14 is supported by the sleeve 10 by a holding body 15, and a passage 16 is formed in the central portion thereof. The hold valve 12 has an end portion on the hold valve side. The valve seat 12b facing the valve body 12a is formed. The holder 15 has a passage 15a and a filter 15b, and the passage 13 and the wheel cylinder side are always maintained in communication with each other through the passage 15a and the filter 15b. FIG.
A front view of the filter is shown in (b).

The outer periphery of the valve seat body 14 is arranged with a predetermined gap between it and the housing 23, and the first plate 18, the spring 19, the second plate 20, and the cup seal 21 are arranged in this order in the gap. It is slidably provided on the outer periphery of the valve seat body 14. The first plate 18 is the valve seat body 14
Movement to the left in the drawing is restricted by the stepped portion 14a formed in the above. Further, at the end of the valve seat body 14, the orifice 1
A cup seal retainer 22 having a number 7 is slidably fitted, and the cup seal retainer 22 is biased toward the housing 23 by a spring 19 (orifice forming mechanism). Also, the cup seal retainer 22 and the housing 2
3, a spring 24 for urging the cup seal retainer 22 to the left in the drawing is arranged, and the cup seal retainer 22 is normally in balance with the springs 19 and 24 (spring 19> spring 24). It is configured to take the position shown in FIG. Further, on the surface of the cup seal retainer that contacts the housing 23, a protrusion 26 for ensuring the flow of the brake fluid is provided.
And a hole 25 is formed in the outer peripheral portion of the valve seat body 1
4 has a function of closing when completely fitted.

The operation of the solenoid valve having the above structure is shown in FIG.
~ It demonstrates with reference to FIG. [In Normal Braking State] In FIG. 3, the first plate 18, the spring 19, the second plate 20, the cup seal 21, and the cup seal retainer 22 having the orifice 17 maintain the illustrated state. Therefore, the brake fluid from the master cylinder is supplied to the passage 16 of the valve seat main body from the orifice 17 formed in the cup seal retainer 22 as shown in the figure, and the cup seal retainer 22
Between the protrusion 26 and the housing → is supplied into the passage 16 through the hole 25, and further, the passage 16 → the open hold valve 12 → the passage 15a of the holding body 15 → the filter 1
It is supplied to the wheel cylinder via 5b and the braking force is applied. At this time, since the brake fluid from the master cylinder is supplied through the orifice 17 and the hole 25, the brake fluid is supplied to the wheel cylinder without being affected by the resistance of the orifice 17, so that the brake can be operated without delay in pressurization. You can

[During Antilock Control] During the antilock operation, the hold valve is closed and the decay valve is opened according to a command from the electronic control unit, and the brake fluid pressure is reduced as shown in FIG. After that, when the decay valve is closed and the hold valve is opened and the pressure is gradually increased, the hydraulic pressure relationship at this time is: hydraulic pressure from the master cylinder side> wheel cylinder hydraulic pressure. 4 reaches a height overcoming the urging force of the spring 19, the cup seal 21 and the cup seal retainer 22 move to the left in the figure against the urging force of the spring as shown in FIG. Close. As a result,
As shown in (b), at the time of gentle pressurization during antilock control, the hydraulic pressure from the master cylinder side flows into the passage 16 only through the orifice 17, and the open passage of the hold valve 12 → holding body 15 15a → filter 15b
Since it is supplied to the wheel cylinder via the, it is possible to suppress the rising rate at the time of pressurization during the antilock control to be low.

The pulsation of the brake fluid pressure generated during the antilock control is absorbed by the spring 19 because it bends the spring 19 via the cup seal retainer 22 and the cup seal 21 as shown by the arrow in FIG. You can Although the solenoid 3 described above is configured as an integrated hold valve and decay valve, these valves may be configured separately, and the orifice forming mechanism is separated from the hold valve. It can also be configured as a separate member.

[0019]

As described in detail above, according to the present invention,
Since a mechanism that forms an orifice only during antilock control is adopted in the solenoid valve of the antilock brake device, it is possible to perform the gentle pressurization of the brake during antilock control. Also, kickback during antilock control can be prevented. Further, it is possible to prevent a delay in pressurization of the brake during normal braking. It is possible to obtain excellent effects such as.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an anti-lock control device according to an embodiment of the present invention.

FIG. 2 is a plan sectional view of a solenoid valve.

FIG. 3 is an enlarged view of a main part of the solenoid when the antilock is not activated.

FIG. 4A is a graph showing brake pressurization during antilock control, and FIG. 4B is an enlarged view of a main part of the solenoid during antilock operation.

FIG. 5 is an enlarged view of a main part of the solenoid valve when preventing kickback.

FIG. 6 is a configuration diagram of a conventional antilock control device.

[Explanation of symbols]

 1 Connection Port to Master Cylinder 2 Connection Port to Wheel Cylinder 3 Solenoid Valve 4 Hydraulic Pump 5 Reservoir 10 Cylindrical Sleeve 11 Decay Valve 12 Hold Valve 13 Flow Path 14 Valve Seat Body 15 Retainer 15a Passage 15b Filter 18 No. 1 plate 19 spring 20 second plate 21 cup seal 22 cup seal holder 23 housing 24 spring 25 hole

Claims (5)

[Claims] 1. An anti-lock brake device for performing anti-lock control by opening / closing control of a hold valve and a decay valve, wherein an orifice forming mechanism capable of forming an orifice 17 upstream of the hold valve only during anti-lock control is arranged. The orifice forming mechanism has a valve seat main body 14 having a passage 16 for communicating the master cylinder and the wheel cylinder at the center and a valve seat 12b of the hold valve at one end.
A cup seal 21 slidably arranged on the outer periphery of the valve seat body, on one end of which hydraulic pressure on the master cylinder side acts, and on the other end, hydraulic pressure of the wheel cylinder side, A hole 25 which is slidably arranged at the end and which normally communicates the master cylinder side with the passage in the valve seat body and blocks communication with the passage as the cup seal moves, and a passage in the valve seat body at all times. A cup seal retainer 22 having an orifice 17 communicating with the master cylinder and configured so that brake fluid pressure always acts from the master cylinder side, and the cup seal 21 is directed toward the cup seal retainer 22. When the brake fluid pressure on the wheel cylinder side is reduced, the cup seal retainer and the cup seal are formed by the fluid pressure on the master cylinder side. The anti-lock brake device is characterized in that the master cylinder side and the wheel cylinder side are communicated with each other only by the orifice 17 formed in the cup seal holder. 2. The pulsation of the brake fluid generated on the master cylinder side can be absorbed by a spring 19 which urges the cup seal toward the cup seal retainer. Anti-lock brake device. 3. An antilock brake device for performing antilock control by opening / closing control of a hold valve and a decay valve, and a solenoid valve 3 in which the hold valve and the decay valve are integrally incorporated, and a hold provided in the solenoid valve. A valve seat main body 14 forming a valve seat of a valve, and a master cylinder side hydraulic pressure acts on one end side and a wheel cylinder side hydraulic pressure acts on the other end side, which is slidably arranged on the outer circumference of the valve seat main body. The cup seal 21 is slidably arranged at the other end of the valve seat body 14, and normally communicates the master cylinder side with the passage in the valve seat body to communicate with the passage as the cup seal moves. It has a hole 25 for shutting off and an orifice 17 communicating the master cylinder with the passage 16 in the valve seat main body at all times and is always on the master cylinder side. When a brake fluid pressure on the wheel cylinder side is reduced, the cup seal retainer 22 is configured to act on the brake fluid pressure from the wheel seal spring 22 and the spring 19 that biases the cup seal toward the cup seal retainer. An anti-lock brake characterized in that the cup seal retainer and the cup seal are moved by hydraulic pressure on the master cylinder side so that the master cylinder side and the wheel cylinder side are communicated only with an orifice formed in the cup seal retainer. apparatus. 4. The spring 19 is provided between the cup seal and the valve seat body, and is configured to be able to bend through the cup seal due to pulsation of hydraulic pressure on the master cylinder side. The anti-lock brake device according to claim 3. 5. The anti-lock brake device according to claim 4, wherein the cup seal retainer 22 is biased toward the cup seal by a spring 24 provided between the cup seal retainer 22 and the housing.