JPS6317156A - Hydraulic power source device for brake of automobile - Google Patents

Abstract

PURPOSE:To achieve the reduction of weight and cost cut by storing the working liquid pressure-increased by a pressure booster by utilizing the liquid pressure of a power steering device and supplying said working liquid into an automatic hydraulic controller, thus reducing the number of parts. CONSTITUTION:When the slip rate of a wheel exceeds a set value when the wheel is brake-applied, each hydraulic pressure of the wheel cylinders 24 and 26 is controlled by the operation of the automatic hydraulic controlled by the operation of the automatic hydraulic controllers 22 and 24. A hydraulic power source device 52 can be connected with one automatic hydraulic controller 44 through an electromagnetic direction selecting valve 50. The hydraulic power source device 52 is constituted so that brake liquid is stored into an accumulator 56 by utilizing the hydraulic pressure of a power steering device 54. A regulator 70 for increasing and decreasing the hydraulic pressure in a liquid feeding passage 66 by suppressing/permitting the free flow of the brake liquid is installed onto the power steering device 54, and the liquid feeding passage part on a pump 64 side from the regulator 70 is connected to the large diameter side hydraulic chamber 96 of a booster 92.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hydraulic pressure source device for a hydraulic brake system for automobiles, and particularly to a hydraulic brake in which the hydraulic pressure of a wheel cylinder is controlled by an automatic hydraulic pressure control device. The present invention relates to a hydraulic pressure source device for a device.

BACKGROUND OF THE INVENTION Some hydraulic brake devices for automobiles have an automatic hydraulic pressure control device controlling the hydraulic pressure of a wheel cylinder of a brake that suppresses rotation of a wheel. To perform anti-skid control, which prevents the slip ratio between the wheels and the road surface from becoming excessive when the vehicle is braked, and traction control, which prevents the slip ratio between the drive wheels and the road surface from becoming excessive when the vehicle starts. Therefore, it is necessary to automatically control the hydraulic pressure in the wheel cylinders.

A hydraulic pressure source device is required to automatically control the hydraulic pressure of the wheel cylinders, and a hydraulic pressure source device is generally used that includes an accumulator and an electric pump that accumulates pressure in the accumulator. In this case, a dedicated pump and motor are required, and the amount of M.

This is undesirable as it increases the installation space and cost.
In addition, since the electric upper is noisy when operating, soundproofing measures are required.

Therefore, Japanese Unexamined Patent Publication No. 58-16947 proposes to utilize the hydraulic pressure of a servo device provided for other purposes for automatic hydraulic pressure control of wheel cylinders. A pump for the servo device or an accumulator for storing the pumped working fluid is provided, and the hydraulic pressure of the accumulator is supplied to the large diameter side hydraulic pressure chamber of the pressure intensifier as needed, and the hydraulic pressure of the accumulator is supplied to the small diameter side hydraulic pressure chamber of the pressure intensifier. The pressure-increased hydraulic fluid is supplied to the automatic hydraulic pressure control device. In this way, a dedicated pump and motor can be omitted.

Problems to be Solved by the Invention However, in this hydraulic pressure source device, an electromagnetic directional control valve is used to control the inflow and outflow of the working fluid into the large-diameter side hydraulic chamber of the pressure intensifier.

There was a problem that the reduction in space and cost was still not sufficient.

Means for Solving the Problem In order to solve this problem, the present invention provides a steering actuator that allows free passage of hydraulic fluid in a neutral position, and supplies hydraulic fluid to the steering actuator through a fluid supply passage. A power steering device equipped with a pump is provided with a pressure increasing/decreasing means that increases or decreases the fluid pressure in the fluid supply passage by suppressing or allowing the free flow of hydraulic fluid, and in a portion on the pump side from the pressure increasing/decreasing means. While the fluid supply passage is connected to the large-diameter hydraulic pressure chamber of the pressure intensifier, a reservoir is connected to the small-diameter hydraulic chamber of the pressure intensifier, allowing hydraulic fluid to flow from the reservoir to the small-diameter hydraulic chamber, but not allowing it to flow out. and an accumulator connected to the automatic hydraulic pressure control device through a discharge valve that allows hydraulic fluid to flow out of the small-diameter hydraulic pressure chamber but prevents its inflow. This is what I did.

The pressure increasing/decreasing means is, for example, an actuator that is normally located at a position that allows free flow of hydraulic fluid, but moves to a position that receives brake fluid pressure on the rear surface and suppresses the flow of hydraulic fluid when the hydraulic brake device is activated. It is also possible to use a regulator with a child, and it is also possible to provide the steering actuator with pressure increasing and decreasing means. If the steering actuator is of a type that allows the free passage of hydraulic fluid in the neutral position, this increase or decrease in the fluid supply passage will occur because the fluid pressure in the fluid supply passage is normally low and is high when the steering actuator is actuated. The pressure can be used to operate the pressure intensifier.

Operation In the hydraulic pressure source device according to the present invention, when the hydraulic pressure in the fluid supply passage of the power steering device is increased, the pressure increasing piston of the pressure intensifier moves forward to reduce the volume of the small diameter side hydraulic pressure chamber, Hydraulic fluid is forced from the small-diameter side hydraulic chamber to the accumulator via the discharge valve.

Then, when the steering actuator becomes inactive and the hydraulic pressure in the pump passage decreases, the pressure boosting piston of the pressure booster moves back and increases the volume of the small diameter side hydraulic chamber, causing hydraulic fluid to flow from the reservoir to the suction valve. It is supplied to the small-diameter side hydraulic pressure chamber through.

Effects of the Invention As described above, the hydraulic pressure source device according to the present invention stores the hydraulic fluid whose pressure has been increased by the pressure intensifier in the accumulator, and supplies the hydraulic fluid from the accumulator to the automatic hydraulic pressure control device.
The pressure intensifier does not necessarily have to operate at the same time as the automatic hydraulic control device operates. As in the hydraulic pressure source device described in the above publication, when the hydraulic fluid discharged from the pressure intensifier is directly supplied to the automatic hydraulic pressure control device, the pressure intensifier is always activated when the automatic hydraulic pressure control device is activated. Therefore, an electromagnetic directional switching valve is required, but if the hydraulic fluid discharged from the pressure booster is stored in an accumulator, there is no restriction on the timing of the pressure booster operation. Therefore, if the steering actuator of the power steering device is selected to allow free passage of the hydraulic fluid in the neutral position, and if a pressure increase/decrease means is provided in the fluid supply passage, the pressure increase/decrease in the fluid supply passage will increase the pressure. This makes it possible to omit the electromagnetic directional valve, and the weight, space, and cost can be reduced accordingly.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a circuit diagram showing a hydraulic brake system for an automobile equipped with a hydraulic pressure source device according to an embodiment of the present invention. In the figure, 10 is a mask cylinder, and a brake booster 12
is actuated by the brake pedal 14 via the brake pedal 14 to generate approximately equal hydraulic pressure in two independent pressure chambers. 16
is a reservoir, which is provided to replenish brake fluid to the mask cylinder IO.

The hydraulic pressure generated in one pressurizing chamber of the mask cylinder 10 is supplied to the wheel cylinders 24 of the left and right front wheel brakes via a liquid passage 20 and an automatic hydraulic pressure control device 22. The automatic hydraulic pressure control device 22 has two cylinders corresponding to each wheel cylinder 24.
The electromagnetic directional control valve 26 includes one reservoir 28 and one pump 30. The electromagnetic directional switching valve 26 is switched between a pressure increasing position, a hydraulic pressure holding position, and a pressure reducing position by an electric control device (not shown). When it is necessary to increase the hydraulic pressure of the wheel cylinder 24, it is switched to the pressure increasing position and the wheel cylinder 24 is communicated with the mask cylinder 10, and when it is necessary to keep the hydraulic pressure of the wheel cylinder 24 constant, it is switched to the pressure increasing position. , wheel cylinder 2
4 from both the mask cylinder 10 and the reservoir 28, and when it is necessary to lower the hydraulic pressure of the wheel cylinder 24, the wheel cylinder 24 is switched to the depressurization position where it is communicated with the reservoir 28. It can be switched. By switching the electromagnetic directional control valve 26 to the pressure reducing position, the brake fluid flowing out from the wheel cylinder 24 is stored in the reservoir 28, pumped up by the pump 30, and returned to the mask cylinder 10. 32 is a check valve, and brake pedal 1
4 is released, the brake fluid is provided to quickly return the brake fluid from the wheel cylinder 24 to the mask cylinder 10.

The hydraulic pressure generated in the other pressurizing chamber of the mask cylinder IO is supplied to the wheel cylinders 46 of the left and right rear wheel brakes via the liquid passage 42 and the automatic hydraulic pressure control device 44. The automatic hydraulic pressure control device 44 is the same as the automatic hydraulic pressure control device 22.
Similarly, the electromagnetic directional valve 26. Reservoir 28. Pump 30. It is equipped with a check valve 32.

An electromagnetic directional switching valve 50 is provided in the middle of the liquid passage 42 . This electromagnetic directional switching valve 50 is normally in a state of communicating the mask cylinder 10 with the automatic hydraulic control device 44, but by being switched by an electric control device (not shown), a fluid separate from the mask cylinder 10 is connected. The pressure source device 52 is connected to the automatic hydraulic pressure control device 44.

The hydraulic pressure source device 52 stores brake fluid (operating fluid) in an accumulator 56 using the hydraulic pressure of the power steering device 54. The power steering device 54 includes a steering actuator 60 that assists the driver's steering force, and a pump 64 that supplies hydraulic fluid pumped from a reservoir 62 to the steering actuator 60. The steering actuator 60 is in a neutral position when the steering wheel is not operated by the driver, and is of a type that allows the hydraulic fluid supplied from the pump 64 to freely flow back into the reservoir 62. A regulator 7° is provided in the middle of a fluid supply passage 66 that guides the working fluid supplied from the pump 64 to the steering actuator 6°. The regulator 7o includes an actuator 72 that is movably provided in a housing (not shown). The actuator 72 is fluid-tightly and slidably fitted into a bore formed in the housing, thereby partitioning the space within the housing into a first hydraulic pressure chamber 74 and a second hydraulic pressure chamber 76 . The first hydraulic chamber 74 is the inlet port 7
8 to the pump 64 while the outlet bow) 8
0 is connected to the steering actuator unique 6o. Further, the second hydraulic chamber 76 is connected to the mask cylinder 10 by a liquid passage 82. The actuator 72 is always in a position retracted toward the second hydraulic pressure chamber 76, allowing the hydraulic fluid that has flowed into the first hydraulic pressure chamber 74 from the inlet port 78 to freely flow to the outlet port 80. However, when hydraulic pressure is generated in the mask cylinder 1o, the hydraulic pressure is received on the back side in the second hydraulic pressure chamber 76, and it is moved forward and seats around the inlet boat 78, and the flow of hydraulic fluid is throttled to the passage 84.
It becomes a state where it is suppressed. As a result, the liquid supply passage 66
The hydraulic pressure at the pump 64 side increases from the regulator 70, and this hydraulic pressure is led to a pressure intensifier 92 via a liquid passage 90.

The pressure intensifier 92 has a pressure intensifying piston 94 fluid-tightly and slidably fitted into a stepped bore formed in a housing (not shown), so that the large-diameter side hydraulic pressure chamber 96 and the small-diameter side hydraulic pressure are connected to each other. A chamber 98 is formed. The pressure increase piston 94 is urged in the backward direction by a spring 100.
Usually, the volume of the large-diameter side hydraulic pressure chamber 96 is the minimum, and the volume of the small-diameter side hydraulic pressure chamber 98 is the maximum.

The small diameter hydraulic pressure chamber 98 is connected to the reservoir 16 through a suction passage 106 and to the accumulator 56 through a discharge passage 108 . The suction passage 106 is provided with a suction valve 110 that allows brake fluid to flow into the small-diameter hydraulic pressure chamber 98 but prevents it from flowing out.
8 is provided with a discharge valve 112 that allows brake fluid to flow out from the small diameter side hydraulic pressure chamber 98 but prevents its inflow.

A relief passage including a relief valve 114 is provided between the discharge passage 108 and the suction passage 106.

In the hydraulic brake device configured as described above,
The mask cylinder 1 is activated in response to the depression of the brake pedal 14.
Hydraulic pressure is generated at zero, and the wheel cylinders 24, 46 are actuated by the hydraulic pressure, thereby braking the wheels. When the wheel slip rate exceeds the set value, the automatic hydraulic pressure control device 22.44 starts operating and controls the hydraulic pressure in the wheel cylinder 24.46 to maintain the wheel slip rate within an appropriate range. do. In other words, anti-skid control is performed.

Further, as described above, each time a brake operation is performed, the regulator 70 becomes in a state where the flow of the hydraulic fluid in the fluid supply passage 66 is suppressed, and as a result, the hydraulic pressure generated in the fluid supply passage 66 is transferred to the large diameter of the pressure intensifier 92. Pressure increase piston 94 in side hydraulic pressure chamber 96
and move it forward. As a result, the volume of the small-diameter side hydraulic pressure chamber 98 decreases, and the brake fluid therein is discharged from the discharge valve 1.
12 and is pushed into the accumulator 56. Then, as the brake operation is released, the regulator 70 returns to a state allowing free flow of the hydraulic fluid, and the hydraulic pressure in the large diameter side hydraulic pressure chamber 96 decreases, so the pressure boosting piston 94 is moved back by the spring 100. I am made to do so. As a result, the volume of the small diameter side hydraulic pressure chamber 98 increases, and the brake fluid flows into the reservoir 16.
The air is inhaled from the air through the intake valve 110. In this way, each time a brake operation is performed, the pressure intensifier 92 is operated and a fixed amount of brake fluid is supplied to the accumulator 56.

If the hydraulic pressure in the accumulator 56 exceeds a set value, the relief valve 114 opens to prevent the hydraulic pressure from increasing any further.

The high pressure brake fluid thus stored in the accumulator 56 is used for traction control. In other words, if the driving force applied to the rear wheels, which are the driving wheels, when the car starts is too large in relation to the coefficient of friction between the road surface and the rear wheels, and the slip ratio of the rear wheels becomes excessive. The electromagnetic directional switching valve 50 is switched, the mask cylinder 10 is disconnected from the automatic hydraulic pressure control device 44, and the hydraulic pressure source device 52 is brought into communication. Then, by using the hydraulic pressure stored in the accumulator 56 of this hydraulic pressure source device 52, the automatic hydraulic pressure control device 44 controls the hydraulic pressure of the wheel cylinder 46 to maintain the slip ratio of the rear wheels within an appropriate range. It is.

As described above, in this hydraulic brake device, the regulator 70 constitutes an increase/decrease pressure stage that increases or decreases the hydraulic pressure in the fluid supply passage 6G of the power steering device 54, and increases or decreases the hydraulic pressure in the fluid supply passage 66 according to the increase or decrease in pressure. The pressure device 92 is activated to store brake fluid in the accumulator 56 at high pressure. Therefore, there is no need to use an electromagnetic directional control valve to operate the pressure intensifier as in the hydraulic pressure source device described in Japanese Patent Application Laid-Open No. 58-16947.

FIG. 2 shows another embodiment of the present invention. This embodiment is obtained by removing the regulator 70 from the above embodiment, and other parts are the same as those of the above embodiment, so corresponding parts are given the same reference numerals and detailed explanations will be omitted. In this embodiment, when the steering actuator 60 operates in response to the steering wheel operation by the driver, the liquid supply passage 66
The pressure intensifier 92 is activated by the increase in the hydraulic pressure. Since the steering actuator 60 allows free flow of hydraulic fluid in the neutral state, normally the fluid pressure in the fluid supply passage 66 is low and the pressure boosting piston 94 of the pressure booster 92 is in the backward position. When the actuator 60 is activated, the steering actuator 60
Since the free flow of the hydraulic fluid is suppressed by itself, the hydraulic pressure in the fluid supply passage 66 increases, and the pressure boosting piston 94 is moved forward.

In this embodiment, since the regulator is omitted, it is possible to further reduce the size and weight of the hydraulic pressure source device.

In the above two embodiments, the hydraulic pressure source device according to the present invention was used for traction control, but it is also used as a hydraulic pressure source device for anti-skid control or a hydraulic brake booster. It is also possible to do so.

In addition, it goes without saying that the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art, although not illustrated individually.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a hydraulic brake device equipped with a hydraulic pressure source device according to an embodiment of the present invention. FIG. 2 is a circuit diagram of a hydraulic brake device equipped with a hydraulic pressure source device according to another embodiment of the present invention. 10: Mask cylinder 16: Reservoir 22: Automatic hydraulic pressure control device 24: Wheel cylinder 44: Automatic hydraulic pressure control device 46: Wheel cylinder 52: Hydraulic pressure source device 54: Power steering device 56: Accumulator

Claims (3)

[Claims] (1) A hydraulic pressure source device for an automobile hydraulic brake system in which the hydraulic pressure of the wheel cylinder of the brake that suppresses the rotation of the wheel is controlled by an automatic hydraulic pressure control device, and in the neutral position, the hydraulic fluid is free. A power steering device including a steering actuator that allows passage of hydraulic fluid through the fluid supply passage and a pump that supplies hydraulic fluid to the steering actuator through the fluid supply passage by suppressing and allowing free flow of the hydraulic fluid. A pressure increasing/decreasing means for increasing/decreasing the hydraulic pressure is provided, and the liquid supply passage is connected to the large diameter side hydraulic chamber of the pressure intensifier at a portion closer to the pump than the pressure increasing/decreasing means, while the small diameter side hydraulic pressure of the pressure intensifier is A reservoir is connected to the small-diameter hydraulic chamber via an inlet valve that allows hydraulic fluid to flow from the reservoir into the small-diameter hydraulic chamber, but prevents hydraulic fluid from flowing out, and an accumulator connected to the automatic hydraulic pressure control device is connected to the small-diameter hydraulic chamber. A hydraulic pressure source device for an automobile brake, characterized in that the pressure chambers are connected to each other via discharge valves that allow hydraulic fluid to flow out of the pressure chambers but prevent hydraulic fluid from flowing into the pressure chambers. (2) The pressure increase/decrease means is normally in a position that allows free flow of hydraulic fluid, and when the hydraulic brake device is activated, moves to a position where it receives brake fluid pressure on the rear surface and suppresses the flow of hydraulic fluid. 2. The hydraulic pressure source device according to claim 1, which is a regulator equipped with an actuator. (3) The hydraulic pressure source device according to claim 1, wherein the steering actuator also serves as the pressure increase/decrease means.