JPH0717617Y2 - Anti-skid controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an anti-skid control device provided in a brake system so that wheels are not locked during sudden braking of a vehicle.

(Prior Art) Conventionally, various anti-skid control devices have been proposed in which a brake system is appropriately controlled when a vehicle is braked so that wheels are not locked on any road surface.

As this anti-skid control device, Japanese Patent Publication No. 61-3373
As disclosed in Japanese Patent Publication No. 8, a hydraulic control valve is provided in a connecting pipe between a brake hydraulic pressure generation source including a master cylinder and the wheel cylinder of a brake device provided on a wheel,
A reservoir for storing brake fluid discharged from the wheel cylinder when the fluid pressure in the wheel cylinder is reduced by control of the fluid pressure control valve is provided, and the brake fluid in the reservoir is a source of brake fluid pressure in the connection pipe. And a pump for returning to the supply pipe between the hydraulic pressure control valve and the first check valve for allowing only the flow of the brake fluid from the brake fluid pressure generation source to the wheel cylinder. A second check valve for allowing the flow of the brake fluid from the wheel cylinder to the brake fluid pressure generation source is arranged in a return pipe line connecting the brake fluid pressure generation source and the wheel cylinder, and the first check valve is provided. Some valves have throttle passages.

In this device, during the control by the hydraulic pressure control valve, even if the brake fluid is returned to the supply pipe by the pump in the state where the communication between the brake fluid pressure generation source and the wheel cylinder is cut off, the brake fluid is released by the first check valve. The kickback phenomenon to the brake pedal can be reduced without flowing to the brake fluid pressure generation source, and when the brake pedal is released, the brake fluid from the wheel cylinder is generated via the second check valve. Returned to.

In this way, by incorporating the check valve, the kickback phenomenon can be reduced or prevented, and good anti-skid control is performed.

By the way, if a check valve is provided in the middle of the piping, the reverse check is performed when the brake system is evacuated by a vacuum pump etc. after the brake system is assembled to the vehicle (hereinafter referred to as vacuuming) and the brake fluid is sent and filled. Since the stop valve is installed so as to block the piping, problems such as insufficient vacuuming, air remaining in the brake system, and complete vacuuming will take time and reduce workability Occurred. Moreover, even if the check valve is provided with a throttle passage, the same problem occurs.

Therefore, when filling the brake fluid, open the valve,
A valve device that acts as a check valve when performing anti-skid control may be used, and such a valve device is disclosed in Japanese Examined Patent Publication No. 61-16656.

As shown in FIG. 4, this valve device 1 is provided in the middle of a connecting pipe 5 between the brake fluid pressure generation source 2 and the wheel cylinder 4 of the brake device provided on the wheel 3, and the brake fluid pressure generation source is provided. A piston 6 that moves by decompressing the brake fluid supplied from 2 and a valve mechanism that includes a ball valve 8 and a spring 9 that are seated on a valve seat 7 with the movement of the piston 6 and then act as a check valve. , Is composed of.

In the figure, 10 is a hydraulic pressure control valve, 11 is a reservoir, 12 is a pump, and 13 is a check valve provided in a return line 14 that connects the brake hydraulic pressure generation source 2 and the wheel cylinder 4. .

(Problems to be solved by the invention) However, in the above valve device, in order to open the valve mechanism when the brake is released (when the hydraulic pressure of the master cylinder is equal to or lower than a predetermined pressure), the piston 6 is moved to the state shown in FIG. The ball valve 8 is moved away from the valve seat 7 by advancing to the position shown.
Therefore, when the braking is started, the piston 6 is retracted due to the increase in the hydraulic pressure of the master cylinder.
Is needed to move the piston 6 until the valve seat 7 is seated on the valve seat 7. In order to supply this amount, the piston stroke of the master cylinder must be lengthened and the cylinder diameter must be increased. There is a possibility that the pressure generation source 2 may become large. If the movement amount of the piston 6 is set to be small in order to prevent this, the gap between the valve seat 7 and the ball valve 8 becomes small, so that vacuuming cannot be performed efficiently.

Therefore, when filling the brake fluid, open the valve,
There is a demand for a valve device that functions as a check valve in a state where the valve element is seated on the valve seat after filling.

The present invention has been made to meet the above-mentioned demand, and an object of the present invention is to provide an anti-skid control device capable of reliably and efficiently performing evacuation.

(Means for Solving the Problems) An anti-skid control device of the present invention is a hydraulic control valve provided in a connecting pipe between a brake hydraulic pressure generation source and a wheel cylinder of a brake device provided on a wheel, and the hydraulic control. A reservoir for storing brake fluid discharged from the wheel cylinder when the fluid pressure in the wheel cylinder is reduced by controlling a valve, a brake fluid pressure source in the connection pipe, and a reservoir for storing the brake fluid in the reservoir. A pump for returning to the supply pipe between the pressure control valve, and the anti-skid control device, wherein the supply pipe has an upstream pressure receiving area for receiving the hydraulic pressure from the brake hydraulic pressure generation source on the downstream side. A stepped piston having a communication hole that is larger than the pressure receiving area and that communicates the brake fluid pressure generation source and the fluid pressure control valve;
The stepped piston is arranged in a communication hole of the stepped piston and a spring member for urging the stepped piston in the downstream direction, and when the stepped piston is located on the upstream side, the valve open state is maintained. A control valve mechanism that allows the flow of the brake fluid from the brake fluid pressure generation source to the fluid pressure control valve when it is located on the downstream side, and limits the flow in the opposite direction,
The stepped piston has a concavo-convex portion that can be fitted into the concavo-convex portion formed on the stepped piston. The stepped piston is held so as to be positioned on the upstream side, and when the hydraulic pressure from the brake hydraulic pressure generation source is applied to the stepped piston, the concave-convex shaped portions are fitted to each other to allow the stepped piston to move in the downstream direction. A valve device including a spacer is provided.

(Operation) With the above configuration, when the brake system is installed in the vehicle, the stepped piston and the spacer do not engage with each other even if the stepped piston and the spacer are biased by the spring member. Since the communication valve is held on the side and the communication hole is opened by the control valve mechanism, the vacuum can be reliably and efficiently evacuated, and the brake fluid can be filled in a short time without air remaining. Then, when the brake fluid is supplied from the brake fluid pressure generation source by depressing the brake pedal after the brake fluid is filled, the uneven portion of the stepped piston is fitted into the uneven portion of the spacer by the hydraulic pressure of the brake fluid. Since the stepped piston is allowed to move to the downstream side, the control valve mechanism allows the flow of the brake fluid from the brake fluid pressure generation source to the fluid pressure control valve, and the flow in the opposite direction. It acts like a limiting check valve to reduce or prevent the kickback phenomenon.

(Example) Next, the Example of this invention is described based on drawing. First
FIG. 2 and FIG. 2 are cross-sectional views of a valve mechanism used in the anti-skid control device of the present embodiment. FIG. 1 is a view showing a state when the brake fluid is filled, and FIG. 2 is filled with the brake fluid. FIG. 3 is a diagram showing a state when hydraulic pressure is applied later, and FIG. 3 is a diagram showing an overall configuration of a brake system having an anti-skid control device.

First, the overall configuration of the anti-skid control device 15 will be described with reference to FIG. 3. Reference numeral 16 is a brake fluid pressure generation source including a master cylinder 17 and a reservoir 18 for supplying brake fluid to the master cylinder 17, and 19 Is a wheel cylinder of a brake device provided on the rear wheel 20, and the brake fluid pressure generation source 16 and the wheel cylinder 19 are fluid pressure control valves.
The pipe 22 is connected via a pipe 21, and a supply pipe 23a, 23b for connecting the brake hydraulic pressure generation source 16 and the hydraulic control valve 21 in this pipe 22 is provided with a valve device 24 which will be described in detail later. ing.

Reference numeral 25 is a reservoir for storing the brake fluid discharged from the wheel cylinder 19 under the control of the fluid pressure control valve 21, and 26 is a pump for returning the brake fluid stored in the reservoir 25 to the supply pipeline 23b. . An accumulator may be provided between the pump 26 and the supply line 23b.

Next, the valve device 24 will be described with reference to FIG.

A large-diameter first cylinder portion 29 and a small-diameter second cylinder portion 30 into which the stepped piston 28 fits are formed in the case 27, and the first cylinder portion 29 is a brake fluid pressure generation source. It is connected to the supply pipe 23a on the 16 side through a passage 31,
The cylinder portion 30 of the wheel cylinder 19 is the supply pipe line 23b on the wheel cylinder 19 side.
Through the passage 32. The passage 31 is formed in a plate 33 crimped to the case 27 to prevent the stepped piston 28 from coming off.

The stepped piston 28 is slidably provided by fitting the large diameter portion 28a into the first cylinder portion 29 and the small diameter portion 28b into the second cylinder portion 30. Defines a first pressure chamber 34 in the first cylinder portion 29,
A second pressure chamber 35 is defined in the cylinder portion 30 of the. Also,
The stepped piston 28 is urged in the downstream direction (direction to reduce the volume of the second pressure chamber 35) by the spring member 36 arranged in the first pressure chamber 34.

A communication hole 28c that connects the brake fluid pressure generation source 16 and the wheel cylinder 19 is formed along the axis of the stepped piston 28, and the control valve mechanism 37 is provided on the brake fluid pressure generation source 16 side of the communication hole 28c. An accommodation chamber 28d for accommodating the is formed. The control valve mechanism 37 includes a valve seat 38 fixed by caulking on the side of the accommodation chamber 28d that opens to the first pressure chamber 34, a valve body 39 that can be seated on the valve seat 38, and a valve body 39 A rod member 41 attached to the valve element 39, the stepped piston 28 is moved to the upstream side (the side that reduces the volume of the first pressure chamber 34). When positioned, the valve body 39 and the valve seat 38 are maintained in the open state with a predetermined gap. Further, when the stepped piston 28 is located on the downstream side, the valve body 39 is seated on the valve seat 38, and when the pressure in the first pressure chamber 34 becomes larger than the biasing force of the spring member 40, the brake fluid is applied. It functions as a check valve that allows the brake fluid to flow from the pressure generation source 16 to the wheel cylinder 19. A cutout 38a is formed in the valve seat 38,
The first pressure chamber 34 and the second pressure chamber 35 are always communicated with each other through the notch 38a.

On the end surface of the stepped piston 28 facing the second pressure chamber 35, an uneven portion 43 composed of an annular convex portion 41 is formed, and the second pressure chamber is made to face the uneven portion 43. Inside the 35, a spacer 46 having an uneven portion 45 formed of an annular concave portion 44 that can be fitted into the annular convex portion 42 is arranged. And, the dimensional relationship between the concave and convex portions 43 and 45 is that the stepped piston 28
Retains the stepped piston 28 on the upstream side without fitting even if it receives a force that is urged by the spring member 36 to move.
The stepped piston 28 is generated by the hydraulic pressure from the brake hydraulic pressure source 16.
The concave-convex portion 43 of the stepped piston 28 is set to fit into the concave-convex portion 45 of the spacer 46 to allow the stepped piston 28 to move in the downstream direction when it receives a moving force.

Next, the operation of the valve device 24 will be described.

When the brake system is assembled to the vehicle, the stepped piston 28 of the valve device 24 is held on the upstream side by the spacer 46 and the valve element 39 of the control valve mechanism 37 is spaced from the valve seat 38 by a constant distance as shown in FIG. Since they are separated from each other, the evacuation is reliably and efficiently performed and the brake fluid is filled without leaving air.

After the brake fluid is filled in the brake system, the brake pedal is depressed to supply the brake fluid from the brake fluid pressure generation source 16 to the first pressure chamber 34.
By applying a force larger than the biasing force of the spring member 36 to the stepped piston 28 due to the difference in pressure receiving area between the small diameter portion 28b and
The convex portion 42 of the concave-convex portion 43 of the stepped piston 28 fits into the concave portion 44 of the concave-convex portion 45 of the spacer 42, and the stepped piston 28 moves to the downstream side. Then, along with that, the control valve mechanism 37
The valve body 39 is seated on the valve seat 38 of the control valve mechanism 37, and the control valve mechanism 37 allows the flow of the brake fluid from the brake fluid pressure generation source to the fluid pressure control valve 21 and restricts the flow in the opposite direction. It works like a check valve (state shown in FIG. 2).

As described above, when the brake fluid is filled, the valve is in the open state, and after filling, the valve body 39 is seated on the valve seat 38 so that the valve acts as a check valve. The vacuum can be evacuated reliably and efficiently without causing deterioration, and the brake fluid can be quickly filled without air remaining.

Here, the operation of the anti-skid control device 15 provided with the valve device 24 will be described. The control device (not shown) appropriately controls the hydraulic pressure control valve 21 to prevent the rear wheel 20 from being locked. The hydraulic pressure inside is adjusted. At this time, the brake fluid discharged from the wheel cylinder 19 by the control of the hydraulic pressure control valve 21 is stored in the reservoir 25 and then returned to the supply pipeline 23b by the pump 26. At this time, the control valve mechanism of the valve device 24 is used. Since the brake fluid is hardly returned to the brake fluid pressure generation source 16 by 37, the kickback phenomenon is reduced. At this time, the supply line 23b
Even if the stepped piston 28 moves to the upstream side due to the hydraulic pressure of the brake fluid that is returned to the master cylinder 17, the stepped piston 28 transmits a small change in hydraulic pressure to the master cylinder 17, so that the kickback phenomenon can be reduced, and conversely. Through the master cylinder 17, the brake pedal can give the driver a feeling that anti-skid control is being performed.

Further, when the brake pedal is released, the hydraulic pressure in the master cylinder 17 decreases and the hydraulic pressure in the first pressure chamber 34 also decreases, so that the hydraulic pressure in the second pressure chamber 35 becomes relatively high. The stepped piston 28 moves upstream with the spacer fitted to separate the valve body 39 and the valve seat 38 of the control valve mechanism 37 from each other so that the first pressure chamber 34 and the second pressure chamber 35 communicate with each other. Therefore, the brake fluid is returned from the wheel cylinder 19 to the brake fluid pressure generation source 16. Therefore, the check valve 13
It is not necessary to provide the return passage 14 (shown in FIG. 4) provided with (shown in FIG. 4), and the vacuum can be reliably performed.

As the hydraulic pressure in the second pressure chamber 35 decreases, the stepped piston 28 moves to the downstream side again due to the difference in the pressure receiving area, and the control valve mechanism 37 blocks the communication hole 28c. Although the hydraulic pressure in the cylinder 19 may not drop below a certain pressure and residual pressure may occur, the hydraulic pressure on the wheel cylinder 19 side is gradually increased by the notch 38a formed in the valve seat 38 of the control valve mechanism 37. When the residual pressure is lowered and the residual pressure is generated, it is possible to prevent the drag phenomenon. When the brake is released, the stepped piston 28 is moved to the downstream side by the bias of the spring member 36 together with the spacer 46 already fitted to the uneven portion 43, and the valve body 39 is closed, as shown in FIG. In this state, when the braking is started, the hydraulic pressure of the master cylinder 17 pushes the valve body 39 open and is directly transmitted to the wheel cylinder 19 side without the stepped piston 28 moving.

If the spacer 46 is made of synthetic resin or rubber, it is possible to prevent the generation of abnormal noise due to the collision with the second cylinder portion 30 when the stepped piston 28 moves to the downstream side. .

Although the spacer 46 is provided in the second pressure chamber 35 so as to be fitted into the uneven portion 43 of the stepped piston 28 in the present embodiment, the present invention is not limited to this.
It suffices that 46 is arranged so as to exhibit the above-mentioned action, and for example, the uneven portion 43 may be formed on the step of the step piston 28, and the spacer may be arranged so as to be fitted thereto (first part). Place it in the position shown in Figure A).

Furthermore, the stepped piston 28 and the uneven portion 4 of the spacer 46
The shape of 3,45 may be any shape as long as it exhibits the above-mentioned action, for example, a combination in which a boss and a boss hole are fitted together, a plurality of uneven portions are fitted together. It may be a combination.

(Effects of the Invention) As described in detail above, in the present invention, the position of the stepped piston is adjusted by the fitting relationship between the uneven portion formed on the stepped piston and the uneven portion formed on the spacer. As a result of the provision of the valve device, the brake fluid pressure can be adjusted by opening the valve when filling the brake fluid, and by providing a valve device that acts like a check valve after the filling when the valve element is seated on the valve seat. The vacuum can be reliably and efficiently evacuated without increasing the size of the source, and the brake fluid can be quickly filled without leaving air.

Further, since it is only necessary to mount the valve device in place of the check valve in the conventional anti-skid control device, the cost is not significantly increased, and the versatility is high.

[Brief description of drawings]

1 and 2 are cross-sectional views showing an example of a valve device provided in an anti-skid control device according to an embodiment of the present invention, and FIG. 1 is a view showing a state before filling with brake fluid. FIG. 2 is a diagram showing a state in which a stepped piston is moved by a hydraulic pressure from a brake hydraulic pressure generation source, FIG. 3 is a diagram showing an example of the entire configuration of an anti-skid control device of the present invention, FIG. FIG. 1 is a diagram showing the overall configuration of an example of a conventional anti-skid control device. 16 ... Brake hydraulic pressure generation source 19 ... Wheel cylinder 21 ... hydraulic pressure control valve, 22 ... connection piping 23a, 23b ... supply piping, 25 ... reservoir 26 ... pump, 24 ... valve device 28 ... stepped piston, 36 ... spring member 37 ... Control valve mechanism, 43, 45 ... Concavo-convex shaped portion 46 ... Spacer

Claims (1)

[Scope of utility model registration request] 1. A hydraulic pressure control valve provided in a connecting pipe between a brake hydraulic pressure generation source and a wheel cylinder of a brake device provided on a wheel, and the hydraulic pressure in the wheel cylinder is reduced by controlling the hydraulic pressure control valve. A reservoir that stores the brake fluid discharged from the wheel cylinder when it is operated, and a pump that returns the brake fluid in the reservoir to the supply pipe between the brake fluid pressure generation source in the connection pipe and the fluid pressure control valve. In the anti-skid control device comprising, the supply pipe, the pressure receiving area on the upstream side that receives the hydraulic pressure from the brake fluid pressure generating source is larger than the pressure receiving area on the downstream side, and the brake fluid pressure generating source, A stepped piston having a communication hole communicating with the hydraulic pressure control valve, a spring member for urging the stepped piston in the downstream direction, and a stepped piston arranged in the communication hole of the stepped piston. When the attached piston is located on the upstream side, the valve open state is maintained,
A control valve mechanism that permits the flow of the brake fluid from the brake fluid pressure generation source to the fluid pressure control valve when the stepped piston is located on the downstream side and limits the flow in the opposite direction; The stepped piston has an uneven portion that can be fitted to the uneven portion formed on the stepped piston, and the stepped piston can be upstream side with respect to the biasing force of the spring member without being fitted into the stepped piston uneven portion. And a spacer that holds the stepped piston so that when the fluid pressure from the brake fluid pressure source is applied to the stepped piston, the concave-convex shaped portions are fitted to each other and allow the stepped piston to move in the downstream direction. An anti-skid control device having an empty valve device.