JPH02286458A - Braking hydraulic pressure controller for vehicle - Google Patents

Abstract

PURPOSE:To make necessary braking pressure demonstrable irrespective of operation of a braking hydraulic pressure generating means by connecting a hydraulic pressure supply source to a control room being partitioned off by a spool valve body of a traction control means at time of traction controlling, and moving the spool valve body to the side of an output chamber. CONSTITUTION:In a traction control means 1 being interposed between a master cylinder M and a braking device B, a spool valve body 8 is fitted in a housing 7 with an input port 6 leading to an output port 2 of the master cylinder M. An output chamber 9 leading to a braking hydraulic chamber 5 of the braking device B and a control room 10 being partitioned to the opposite side both are formed in the housing 7 by the spool valve body 8, and this control room 10 is made connectible to a hydraulic supply source 14 and a reservoir R via a selector valve means V. In addition, a ring groove 12 to be interconnected to the input port 6 is formed in the spool valve body 8 in the state that this spool valve body shifts to the side of the control room 10 at its maximum, while there are provided with interconnecting holes 13 which interconnect this ring groove 12 to the output chamber 9.

Description

Detailed Description of the Invention A1 Objective of the Invention (1) Industrial Application Field The present invention provides a brake hydraulic pressure generating means capable of generating a brake hydraulic pressure according to the amount of braking operation, and a brake device mounted on a driving wheel. The present invention relates to a brake hydraulic control device for a vehicle, in which a traction control means is interposed between the brake hydraulic pressure generating means and the brake device, and is capable of increasing the braking pressure of the brake device when disconnected.

(2) Prior Art Conventionally, such a device has been disclosed in, for example, Japanese Unexamined Patent Publication No. 62-26506.
It is publicly known from Publication No. 1 and the like.

(3) Problems to be Solved by the Invention By the way, in the above-mentioned conventional device, the traction control means is composed of an electromagnetic on-off valve and a slave cylinder, and during traction control, the electromagnetic on-off valve is closed to connect the slave cylinder and the braking oil pressure generating means. At the same time, the slave cylinder is operated by hydraulic pressure from a hydraulic pressure supply source, and the braking pressure of the brake device is increased regardless of the operation of the braking hydraulic pressure generating means. However, in such a device,
The electromagnetic on-off valve is required between the slave cylinder and the braking oil pressure generating means, which increases the number of parts.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a brake hydraulic control system for a vehicle that is capable of performing traction control with a simple configuration having a relatively small number of parts.

B1 Structure of the Invention (1) Means for Solving the Problems According to the present invention, the traction control means includes a housing having an input port communicating with the braking oil pressure generating means, and an output chamber defined between the housing. The housing is movable between a control room side position where the input port and the output chamber communicate with each other while facing both axial end faces toward the control room, and an output chamber side position where the input port and output chamber are blocked. The brake device is connected to the output chamber, and the hydraulic pressure supply source and the reservoir are connected to the control chamber through a switching valve means whose connection state can be selectively switched. Connected.

(2) Effect According to the above configuration, during traction control, by connecting the hydraulic pressure supply source to the control chamber, the spool valve body moves to the output chamber side and blocks the input port and the output chamber, and also closes the input port and the output chamber. , thereby increasing the braking pressure of the brake device regardless of the operation of the braking oil pressure generating means.

(3) Embodiment Below, an embodiment of the present invention will be explained with reference to the drawings. First, in FIG. A mask cylinder M as a generating means, a brake device B attached to a driving wheel, and a mask cylinder M
and a traction control means 1 interposed between the brake device B and the brake device B.

The mask cylinder M has an output port 2, from which a brake hydraulic pressure corresponding to the amount of depression of the brake pedal P, that is, the amount of braking operations is output. The brake device B also includes a cylinder body 3 and a brake piston 4 that is slidably fitted into the cylinder body 3, and inputs hydraulic pressure into a brake hydraulic chamber 5 defined between the cylinder body 3 and the brake piston 4. It exerts braking force according to the hydraulic pressure applied.

The traction control means 1 includes a housing 7 formed in a cylindrical shape with both ends closed and having an input port communicating with the output port 2 of the mask cylinder M, and a spool valve body 8 slidably fitted into the housing 7. Equipped with. The spool valve body 8 is formed in a cylindrical shape with a bottom, and is attached to the housing 7.
An output chamber 9 communicating with the braking hydraulic pressure chamber 5 of the brake device B is defined between one axial end of the spool valve body 8 and the open end of the spool valve body 8, and an output chamber 9 is defined between the closed end of the spool valve body 8 and the other axial end of the housing 7. A control room 10 is defined between them. Moreover, the spool valve body 8 is placed in the output chamber 9 on the control chamber 10 side, that is, in the output chamber 1.
A spring 11 is housed therein, which exerts a spring force that biases the volume of 0 in the direction of increasing it.

Referring also to FIG. 2, an annular groove 12 is provided on the outer surface of the spool valve body 8, and this annular groove 12 is formed when the spool valve body 8 is moved to the maximum extent toward the control chamber 10. It is disposed on the spool valve body 8 at a position communicating with the input port of the housing 7. Moreover, a plurality of, for example, four, communication holes 13 are bored in the spool valve body 8 to communicate the annular groove 12 with the output chamber 9. The spool valve body 8 is located at a position on the I control chamber 10 side that communicates between the input port and the output chamber 9, and at a position on the output chamber 9 that blocks the input port and the output chamber 9.
It is movable between side positions.

A hydraulic pressure supply source 14 and a reservoir R are connected to the control chamber 10 via a switching valve means (2) whose connection state can be selectively switched. The switching valve means (2) includes a normally closed first solenoid valve 15 interposed between the control chamber 10 and the hydraulic pressure supply source 14, and a normally open second solenoid valve 16 interposed between the control chamber 10 and the reservoir R. It consists of The first solenoid valve 15 is closed when it is demagnetized, and opens when it is energized. Further, the second solenoid valve 16 is open when it is demagnetized and closed when it is energized.

The hydraulic pressure supply source 14 includes a hydraulic pump 17 that pumps hydraulic oil from the reservoir R, an accumulator 18 connected to the hydraulic pump 17, and a hydraulic sensor 19 for controlling the operation of the hydraulic pump 17.

Next, the operation of this embodiment will be described. During normal braking operation, the first and second solenoid valves 15,16 are demagnetized, and the control chamber 10 is communicated with the reservoir R. Therefore, the spool valve body 8 of the traction control means 1 is moved as much as possible toward the control chamber 10 by the spring 11, and in this state, the spool valve body 8 is at a position where the annular groove 12 communicates with the input port, that is, the input port is output. Room 9
It is located in a position that communicates with

When the brake pedal P is depressed to perform a braking operation in such a state, braking oil pressure corresponding to the amount of braking operation is outputted from the output port 2 of the mask cylinder M, and the braking oil pressure is transferred to the input port of the traction control means 1 and the annular groove. 12, through the communication hole 13 and the output chamber 9, it acts on the braking hydraulic chamber 5 of the brake device B, so that the brake device B can obtain a braking force.

When performing traction control to avoid excessive slip in the drive wheels during non-braking operation, the first and second solenoid valves 15 and 16 are energized to communicate the control chamber 10 with the hydraulic pressure supply source 14.

As a result, the oil pressure in the control chamber 10 increases, and the spool valve body 8 in the traction control means 1 moves to the side that contracts the volume of the output chamber 9 against the spring force of the spring 11. As a result, the annular groove 12 moves to the device constituted by the input port, and the output chamber 9 and the input port are cut off.

Therefore, the brake hydraulic pressure chamber 5 of the brake device B has an output chamber 9.
Hydraulic pressure corresponding to the volumetric contraction of is applied, and the brake device B exerts a braking force, thereby making it possible to prevent excessive slip from occurring in the drive wheels.

During this traction control, when the first solenoid valve 15 is closed and the second solenoid valve 16 is closed, the control chamber 10 is cut off from the hydraulic pressure supply source 14 and the reservoir R, and the braking force of the brake device B is maintained. Furthermore, when the first solenoid valve 15 is closed and the second solenoid valve 16 is opened, the control chamber IO is communicated with the reservoir R, the spool valve body 8 is moved to the right in FIG. 1, and the brake system is activated. The braking force of B can be reduced.

In this way, the mask cylinder M and the brake device B
Traction control can be carried out by simply interposing a traction control means 1 of a simple construction in which a spool valve body 8 is slidably fitted into a housing 7.

C0 Effects of the Invention As described above, according to the present invention, the traction control means includes a housing having an input port communicating with the braking oil pressure generating means, and an output chamber and a control chamber defined between the housing in the axial direction. It is slidably fitted into the housing so that it can be moved between a control room side position that communicates between the input port and output chamber while facing both ends, and an output chamber side position that blocks the connection between the human-powered boat and the output chamber. The brake device is connected to the output chamber, and the hydraulic pressure supply source and the reservoir are connected to the control chamber via a switching valve means that can selectively switch the connection state, so that the hydraulic pressure is controlled. By connecting the supply source to the control room, the connection between the input port and the output chamber is cut off, and the volume of the output chamber is contracted, making it possible to increase the braking pressure of the brake system regardless of the operation of the braking hydraulic pressure generating means, and reducing the number of parts. It becomes possible to perform traction control with a simple configuration that reduces the amount of noise.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a hydraulic circuit diagram including a longitudinal section of a traction control means, and FIG. 2 is a sectional view taken along the line 1--2 in FIG. 1... Traction control means, 6... Input port,
7...Housing, 8...Spool valve body, 9...
Output room, lO...control room, 14...hydraulic supply source, B
...Brake device, M...Mask cylinder as means for generating braking oil pressure, R...Reservoir, ■...Switching valve means

Claims (1)

[Claims] Between a brake hydraulic pressure generation means capable of generating brake hydraulic pressure according to the amount of braking operation and a brake device attached to the drive wheel,
In the brake hydraulic control device for a vehicle, the traction control means is interposed between the brake hydraulic pressure generating means and the brake device and can increase the braking pressure of the brake device when disconnected. A housing having an input port communicating with the means, and a position and input on the control chamber side that communicates between the input port and the output chamber while facing both axial end surfaces to the output chamber and control chamber defined between the housing. The brake device is provided with a spool valve body that is movable between the port and a position on the output chamber side that blocks the output chamber, and is slidably fitted into the housing, and the brake device is communicated with the output chamber and connected to a hydraulic pressure supply source. A braking hydraulic control device for a vehicle, wherein the reservoir is connected to a control chamber via a switching valve means that can selectively switch a connection state.