JPH09254799A - Hydraulic circuit device for power steering pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide an hydraulic source for an auxiliary hydraulic apparatus in a vehicle by arranging an oil circuit in which the second selector valve switches oil from the first selector valve to a coupler supplying oil to the part other than a power steering wheel and to a return circuit to an oil reservoir. SOLUTION: A solenoid valve 3 serving as the first selector valve, by which oil from a pump 2 is switched to a steering gear box 5 and to the second valve 6, is arranged in an oil circuit A connecting a discharge port 2b of the pump 2 to an input side connection port 5b of the steering gear box 5. The solenoid valve 3 is connected to the second selector valve 6, by which oil from the solenoid valve 3 is switched to an oil reservoir 1 and to a female type coupler 7, via an oil circuit B, and the second selector valve 6 is connected to the female type coupler 7. In this way, a hydraulic source for an auxiliary hydraulic apparatus in a vehicle can be obtained easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit device for a power steering pump.

[0002]

2. Description of the Related Art As shown in FIG. 5, for example, oil from an oil reservoir 1 is supplied to a steering gear box 5 of an integral type power steering via a hydraulic pump 2 to reduce a steering force of a vehicle. Power (assist) steering devices are known. In addition,
Reference numeral 2a is a pulley for driving the hydraulic pump 2, 5a is a yoke connected to the steering shaft, and 8 is a relief valve.

FIG. 5 shows an example of a vehicle speed-sensitive power steering system that reduces the assist amount of the steering force during high-speed traveling. A solenoid valve 3 for controlling the oil amount is provided between the hydraulic pump 2 and the steering gear box 5. A controller 6 is provided so as to reduce the oil flow rate by a signal from a vehicle speed sensor 7 provided in a speedometer 9. Here, reference numeral 4 indicates a changeover switch (see Japanese Utility Model Laid-Open No. 3-121080).

[0004]

However, hydraulic pressure is taken out from a hydraulic pump (hereinafter referred to as a power steering pump) used in a power steering device, and other hydraulic devices auxiliary to a vehicle, such as a hydraulic jack, are used. It has never been used for.

Accordingly, it is an object of the present invention to provide a hydraulic circuit device for a power steering pump, which is provided with a circuit for easily taking out hydraulic pressure from the hydraulic circuit for the power steering pump.

[0006]

According to the present invention, in a hydraulic circuit device for a power steering pump, a first switching valve for switching a discharge port of the power steering pump between a steering gear box and a second switching valve is provided. The steering gear box input side connection port,
The second switching valve is provided with an oil circuit that switches between a coupler that supplies the oil from the first switching valve to a part other than the power steering and a return circuit to the oil reservoir.

Further, according to the present invention, the first switching valve is a solenoid valve, and a switching switch for controlling the solenoid valve is provided.

Further, according to the present invention, the second switching valve is a solenoid valve, and a switching switch for controlling the solenoid valve is provided.

Furthermore, according to the present invention, both the first switching valve and the second switching valve use cocks.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, members having the same functions as those in the prior art are designated by the same reference numerals, and the duplicate description will be omitted.

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. The oil reservoir 1 and the power steering pump 2 are connected by a pipe 9, and the pump 2 is provided with a relief valve 8. The relief oil is returned to the oil reservoir 1 by the return pipe 10.

In the oil circuit A connecting the discharge port 2b of the pump 2 and the input side connection port 5b of the steering gear box 5, the oil from the pump 2 is supplied to the steering gear box 5 and the second switching valve 6. First to switch
The solenoid valve 3 which is a switching valve of the above is installed.

Further, the solenoid valve 3 is connected to an oil circuit B to a three-way cock 6 which is a second switching valve for switching the oil from the solenoid valve 3 to the oil reservoir 1 and the female coupler 7. The direction cock 6 is connected to the female coupler 7. Further, the solenoid valve 3 is connected to the changeover switch 4 by an electric circuit.

The structure within the chain line shows the structure of an embodiment of the present application added to the oil circuit of the power steering.

Hereinafter, the operation will be described.

When the hydraulic pressure of the power steering pump 2 is used for an auxiliary hydraulic device of the vehicle, for example, a hydraulic jack (not shown), the hose of the hydraulic jack is connected to the female coupler 7 and the pump is operated to operate the solenoid 3 When the selector switch 4 for controlling the switch is switched to the three-way cock side and the three-way cock 6 is switched to the coupler side, the hydraulic pressure acts on the jack, so that the jack can be easily operated. In this case, since the hydraulic pressure does not act on the steering wheel, the steering wheel does not operate.

FIG. 2 shows another embodiment of the present invention.
Unlike the first embodiment, a second solenoid valve 6 and a second changeover switch 4a for controlling the solenoid valve 6 are provided in place of the three-way cock which is the second changeover valve. This is the same as the first embodiment, and the second solenoid 6 can be controlled from outside the vehicle by extending the cord, which is more convenient than the first embodiment.

FIG. 3 shows another embodiment of the present invention.
In contrast to the first embodiment, the first switching valve also uses the three-way cock 3, and although there is the inconvenience that all operations cannot be done from outside the vehicle, the structure is simple because there is no electric circuit and changeover switches 4, 4a. It has the advantages of high reliability and low cost.

FIG. 4 shows another application example of the present invention, showing a case where the hydraulic circuit device of the present invention is used for speed-sensitive type power steering, and the hydraulic circuit device of the present invention is constructed within a chain line like the standard type. By doing so, it is possible to obtain exactly the same effect.

[0021]

Since the present invention is configured as described above, the hydraulic power source for the auxiliary hydraulic equipment of the vehicle can be easily provided by simply inserting the hydraulic circuit device having a simple structure in the hydraulic circuit of the power steering. Can be obtained and has the advantage of low cost.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a hydraulic circuit device showing an embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing another embodiment of the present invention.

FIG. 3 is an overall configuration diagram showing another embodiment of the present invention.

FIG. 4 is an overall configuration diagram showing another application example of the present invention.

FIG. 5 is an overall configuration diagram showing an example of a conventional technique.

FIG. 6 is an overall configuration diagram showing another example of a conventional technique.

[Explanation of symbols]

 1 ... Oil reservoir 2 ... Hydraulic pump 3 ... First changeover valve 4, 4a ... Changeover switch 5 ... Steering gear box 6 ... Second changeover valve 7 ... Female Type coupler 8 ... Relief valve 9 ... Pipe 10 ... Return pipe A, B ... Oil circuit

Claims (4)

[Claims] 1. In a hydraulic circuit device of a power steering pump, a steering gear box is connected to an input side connection port via a first switching valve for switching a discharge port of the power steering pump between a steering gear box and a second switching valve. The power steering pump is characterized in that the second switching valve is provided with an oil circuit for switching the coupler for supplying the oil from the first switching valve to a part other than the power steering and the return circuit to the oil reservoir. Hydraulic circuit device. 2. The hydraulic circuit device for a power steering pump according to claim 1, wherein the first switching valve is a solenoid valve, and a switching switch for controlling the solenoid valve is provided. 3. The hydraulic circuit device for a power steering pump according to claim 1, wherein the second switching valve is a solenoid valve, and a switching switch for controlling the solenoid valve is provided. 4. The hydraulic circuit device for a power steering pump according to claim 1, wherein both the first switching valve and the second switching valve are cocks.