JPH0649443B2 - Hydro booster with anti-skidding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydrobooster in which an antiskid device is integrally combined.

(Prior Art) Conventionally, as a device used for a brake system for vehicle braking, various proposals have been made such as a hydro booster as a booster mechanism and an anti-skid control device for preventing wheel lock during braking. However, they are generally configured as individual devices.

However, since these are built into one system called the vehicle brake, if these units are combined properly, the workability of assembling into the vehicle will be advantageous, and further structural and functional If the improvement is achieved, its usefulness will be extremely large.

By the way, in such a device, the operation of the anti-skid device, which is rarely operated, is guaranteed, and the normal brake system is not adversely affected even when the anti-skid control system fails. It is important to take

As a countermeasure for this, there is a conventional proposal, for example, in Japanese Patent Laid-Open No. 49-112074.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional proposal device, the spool in the pressure adjusting device repeatedly moves according to the increase / decrease in the hydraulic pressure in the brake device during the anti-skid control, which causes the brake pedal to move. There is a problem that it causes an unfavorable pedal feeling that the kick back is affected.

The present invention has been made from such a viewpoint, and an object thereof is to improve the operation reliability of the anti-skid device, and at the time of failure of the anti-skid control system, the normal braking system is not adversely affected. The purpose of the present invention is to provide a hydro booster in which the occurrence of kickback to the pedal can be limited to only once at the start of control and the adverse effect of pedal feeling is greatly improved.

(Means for Solving the Problem) Therefore, the feature of the hydro booster with the anti-skid device according to the present invention, which is made to realize such an object, is that the pressure from the pressure accumulation source depends on the stepping force of the brake pedal. A hydro booster type pedal response device that determines the introduced hydraulic pressure level, a master cylinder type control hydraulic pressure generation device that generates a control hydraulic pressure depending on the hydraulic pressure action of the introduced hydraulic pressure, and a power that receives and moves the control hydraulic pressure at one end. A sub-cylinder device having an anti-skid oil chamber for generating a brake hydraulic pressure by the piston and exerting a hydraulic pressure in the return direction on the power piston, and a connection for transmitting the introduced hydraulic pressure of the pedal response device to the anti-skid oil chamber of the sub-cylinder device It is installed on the path and receives the anti-skid signal as an input to the anti-skid oil chamber when the anti-skid control starts. Is supplied to return the power piston to the initial position, and an anti-skid control solenoid valve device capable of supplying and discharging the hydraulic pressure to and from the brake device by using the introduced hydraulic pressure of the pedal response device as a pressure source is provided. .

(Operation) According to the device of the present invention having the above-described configuration, since the sub-cylinder device that normally operates during braking is used for anti-skid control, the anti-skid control device operates by always operating except the anti-skid control solenoid valve. Improved reliability,
Also, during anti-skid control, the sub-cylinder device is returned to the initial state at the start of the control, and thereafter, the hydraulic pressure of the brake device is directly increased / decreased, so the occurrence of kickback is limited to the beginning of the control. The pedal feel is greatly improved compared to the type that always causes kickback.

(Example) Hereinafter, the present invention will be described based on an example shown in the drawings.

The apparatus of the present embodiment comprises a main cylinder apparatus 1 in which a hydro booster type pedal response apparatus and a master cylinder type control hydraulic pressure generating apparatus are housed in concentric stepped cylinders I and II, and a control oil chamber of this main cylinder apparatus. Control oil chamber H connected to F
It is composed of a combination of a sub-cylinder device 100 having an anti-skid oil chamber C of the sub-cylinder device and an anti-skid control solenoid valve device 200 for supplying and discharging the hydraulic pressure of the anti-skid oil chamber C of the sub-cylinder device. Illustration of a sub cylinder device hydraulically linked to the control oil chamber G of the other system is omitted. That is, in the device of this example, the brake hydraulic system has two independent systems, and the independent sub-cylinder device and the anti-skid control solenoid valve device are connected to the two control oil chambers F and G of the tandem master cylinder device, respectively. It is provided.

First, the individual configuration of each of these devices will be described.

Main Cylinder Device 1 First, the pedal response device in the cylinder I will be described.
This is the control piston 3 in which an appropriate flow path is formed.
Is slidably engaged with the first cylinder I and is biased by the return spring 5 toward the rear end (right end in the drawing) opening side. And the in-shaft cylinder 3a of this control piston 3
A flow path switching piston 4 is slidably fitted therein, and its rear end portion is engaged with a brake pedal via a ball joint (not shown).

The pedal response device constituted by the relationship between the control piston 3 and the switching piston 4 is substantially the same as the known hydro booster, and is in the state shown in the drawing when the brake is not applied, and the introduction oil chamber B and the hydraulic pressure release oil chamber are shown. When E is communicated through the passage 4a and the switching piston 4 is relatively embedded in the control piston 3 by the brake pedal depression force,
The communication between the oil chambers B to E is closed, and the pressure source side oil chamber A is closed.
And the oil chamber B are communicated with each other. Oil chamber A
Is connected to the pressure accumulator 6.

In the above description, when the oil pressure is introduced into the oil chamber B by the communication between the oil chambers A and B, the oil pressure against the stepping force of the brake pedal acts on the tip of the switching piston 4,
This acts as a reaction force against the pedal depression force. Therefore, oil pressure proportional to the stepping force on the brake pedal is transmitted from the oil chamber A to the oil chamber B, and in this state, the communication between the oil chambers A, B and E is cut off.

When the oil pressure is introduced into the oil chamber B, the action of this introduced oil pressure gives the control piston 3 a forward force (moving to the left) against the spring force of the return spring 5.

Reference numeral 7 is a return spring for the switching piston.

Next, the configuration of the tandem master cylinder type control hydraulic pressure generator in the second cylinder II will be described.

The guide device of the present embodiment accommodates the first and second hydraulic pistons 10 and 11 in the cylinder II and a pair of return springs 12 and 13 that biases these pistons to the initial position, and the rear end of the first hydraulic piston 10 ( The control piston 3 is linkedly engaged with the right end of the drawing, and the moving force of the control piston 3 is received as an external input to generate a control oil pressure in the pair of control oil chambers F and G. The hydraulic pressures of the pair of control oil chambers F and G are balanced by the balancing action of the second hydraulic piston 11.

In addition, 14 is a guide ring of the first hydraulic piston 10, and 1
Reference numerals 5 and 16 denote one-way sealing mechanisms provided so that oil can be supplied from the reservoirs 17 and 18 to the control oil chambers F and G.

The main cylinder device 1 described above introduces a predetermined hydraulic pressure into the introduction oil chamber B according to the stepping force on the brake pedal, and generates the control oil pressure in the control oil chambers F and G according to the value of this introduction hydraulic pressure. Therefore, the boosting ratio is determined according to the pressure receiving area that determines the magnitude of the hydraulic reaction force acting on the switching piston 4.

Sub-cylinder device 100 In the sub-cylinder device of this example, a power piston 103 is housed over two hydraulically partitioned cylinders 101 and 102, and the rear end (right end in the figure) of the power piston 103 is a control oil chamber. H (communicating with the control oil chamber F of the main cylinder device) and the front end (left end in the figure) of the hydraulic piston 10
4 is engaged. The hydraulic piston 104 faces the brake fluid chamber I (communicating with the wheel cylinder W / C of the brake device) at its front end, and the built-in on-off valve 105 opens the circuit to constantly (when stationary) the pressure fluid in the brake fluid chamber I. When the hydraulic piston 104 is drained to the reservoir 106 and moved by the power piston 103, the built-in on-off valve 1
When 05 is closed, a brake oil pressure is generated in the brake oil chamber I. The on-off valve 105 is the hydraulic piston 10
4 has a ball valve element in the internal flow path, and the ball valve element is separated from the valve seat by a locking rod 107. Reference numerals 108 and 109 are a power spring return spring and a 110 locking rod set spring, respectively. An anti-skid oil chamber C for pushing back the power piston 103 in the control oil chamber H direction is provided in the cylinder 102 of the sub-cylinder device 100. The anti-skid oil chamber C is an anti-skid solenoid valve. It is connected to the introduction oil chamber B of the pedal response device through the device 200.

In the sub-cylinder device 100 configured as described above, during normal braking, the power piston 103 moves depending on the hydraulic pressure value transmitted to the control oil chamber H, which causes the movement of the hydraulic piston 104, and thus the closing and closing of the on-off valve 105. The brake oil pressure in the brake oil chamber I is generated. At this time, no hydraulic pressure is transmitted to the anti-skid oil chamber C.

During the anti-skid control, the hydraulic pressure is transmitted to the anti-skid oil chamber C, whereby the power piston 103 is returned in the direction of the control oil chamber H, and thus the hydraulic piston 104
Of the brake oil pressure is reduced to cause the brake oil pressure to be reduced.
Pressurization hold is performed.

Anti-skid control solenoid valve device 200 This device of this example is a normally-closed solenoid valve (hereinafter PSV) provided in the middle of a connection path 201 between the introduction oil chamber B of the pedal response device and the anti-skid oil chamber C. 204) and a hold valve 2 which is a normally open solenoid valve interposed in a path 202 for introducing hydraulic pressure into the brake oil chamber I during antiskid operation.
05 and a pressure reducing valve 206 which is a normally open solenoid valve provided in a path 203 for draining the pressure oil in the brake fluid chamber I to the reservoir 106 through the opening / closing valve of the sub-cylinder device. Further, a check valve 207 is interposed. Although the reservoir 106 is shown as a symbol, this corresponds to the reservoir 19 integrated with the main cylinder device. Further, it is desirable that the control oil pressure of the hydro-booster (the pressure of the control oil chamber B) and the pressure of the brake oil chamber I are set to be substantially inductive pressure.

In this way, each solenoid valve of the solenoid valve device 200 is subjected to open / close switching control as shown in the following table, for example, by inputting each antiskid signal for depressurizing, pressurizing, and holding the brake hydraulic pressure for antiskid control.

The anti-skid signal for operating the solenoid valve device described above uses a known anti-skid control circuit that detects and outputs control information for depressurizing, pressurizing, and holding the brake hydraulic pressure depending on the vehicle speed state. Obtainable. The operation of each solenoid valve device may be performed by opening and closing in a pulsed manner.

In addition, 20 is a pump that pumps the oil in the reservoir 106 to the pressure accumulator 6, and 21 and 22 are check valves.

According to the hydro-booster with an anti-skid device having the above structure, the oil chambers F and H of the normal brake system and the oil chambers A to C of the anti-skid control system are hydraulically independent, and the anti-skid control system is also independent. Since the normal brake system is not affected even if the hydraulic pressure failure occurs, the anti-skid control mechanism, which improves the reliability of the brake system and its operation is rare, is a function of the auxiliary cylinder device that operates during normal braking. Since it is a system in which hydraulic pressure is applied to the power piston, there is an effect that there is almost no risk of problems such as rusting.

(Effect of the Invention) According to the present invention described above, the anti-skid device is operated by returning the sub-cylinder device that operates during normal braking to the initial state, and the brake hydraulic pressure is increased or decreased by using the hydraulic pressure introduced by the hydrobooster as the hydraulic pressure source. Since it operates as a device, the reliability of device operation is improved, and during anti-skid control,
By simply returning the normal brake system to the initial position at the start of control, the effect that anti-skid control can be performed without adversely affecting the feeling of kickback on the brake pedal is obtained. It is great.

[Brief description of drawings]

Drawing is a figure showing an example of composition outline of a hydro booster which is one example of the present invention. 1: Main cylinder device 3: Control piston 4: Switching piston 5, 7: Return spring 6: Accumulator, 10, 11: Hydraulic piston 12, 13: Return spring 14: Guide ring, 17, 18: Reservoir 19: Reservoir , 20: Pump 100: Secondary cylinder device 101, 102: Cylinder, 103: Power piston 104: Hydraulic piston, 105: Open / close valve 106: Reservoir, 107: Lock rod 108, 109: Return spring 110: Set spring 200: Electromagnetic Valve device, 201, 202, 203: Path 204: PSV, 205: Hold valve 206: Pressure reducing valve

Claims (1)

[Claims] 1. A hydro-booster type pedal responding device in which the level of introduced hydraulic pressure from a pressure accumulation source is determined depending on the stepping force of a brake pedal, and a master cylinder which generates a control hydraulic pressure depending on the hydraulic pressure action of the introduced hydraulic pressure. Type control hydraulic pressure generating device, a sub-cylinder device having an anti-skid oil chamber for generating a brake hydraulic pressure by a power piston that moves by receiving the control hydraulic pressure at one end, and exerting a hydraulic pressure in the return direction on the power piston, It is installed in a connection path that transmits the introduced hydraulic pressure of the pedal response device to the anti-skid oil chamber of the sub-cylinder device, and supplies the hydraulic pressure to the anti-skid oil chamber at the start of the anti-skid control using the anti-skid signal as an input to drive the power piston. At the same time as returning to the initial position, the hydraulic pressure introduced into the pedal response device is used as a pressure source to supply and discharge hydraulic pressure to the brake device Nchisukiddo control solenoid valve device,
Hydro booster with anti-skid device.