JPS6220724Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a hydraulic pressure generating device that is mounted on a vehicle or the like equipped with various hydraulic working devices.

[Conventional technology]

2. Description of the Related Art Vehicles equipped with various types of hydraulic work equipment are equipped with a hydraulic pressure generator as a hydraulic power source for driving the work equipment. By the way, this type of hydraulic pressure generator includes an oil tank, a hydraulic pump that sucks up and discharges the oil in the oil tank, a pressure oil inlet for connecting the actuator of the work equipment, etc., and It is generally equipped with a switching valve that disconnects the pressure oil inlet from the hydraulic pump and connects the pressure oil inlet to the hydraulic pump or oil tank at a predetermined switching position. The pump is normally driven using a portion of the vehicle's engine power. However, with such a system, by stopping the vehicle with the engine running and operating the switching valve, the pressure oil discharged from the hydraulic pump can be transferred from the pressure oil inlet to the work equipment. Although it is possible to supply oil to the actuator and return waste oil discharged from the actuator into the oil tank through the pressure oil outlet, this is not enough to simply return the switching valve to the neutral position and start the vehicle. There is a problem in that the pressure oil discharged from the hydraulic pump cannot be effectively used when the vehicle is running. In other words, with such a configuration, even if the hydraulic pump is operating, as long as the switching valve is held in the neutral position, the pressure oil discharged from the hydraulic pump can be taken out of the device and used. Can not. Therefore, for example, in vehicles that use a power steering device,
Despite being equipped with a hydraulic pressure generator, there is the inconvenience of having to separately provide a hydraulic pump, oil tank, etc. exclusively for the power steering system.

As one measure to deal with such problems, for example, as shown in Japanese Utility Model Application No. 49-12657, an auxiliary hydraulic circuit is branched from the starting end of the main hydraulic circuit connected to the discharge port of the hydraulic pump. This auxiliary hydraulic circuit may include an on-off valve that is switched in conjunction with the switching valve of the main hydraulic circuit. However, if these two valves are connected so that the on-off valve opens when the switching valve of the main hydraulic circuit is held in the neutral position, an extra hydraulic pump and oil tank can be added. It becomes possible to drive auxiliary devices such as power steering as described above without any problems. However, if such switching valves and on-off valves are provided separately and interlocked with each other, the number of parts increases and the structure becomes complicated. Therefore, when it is incorporated into a hydraulic pressure generating device, there is a problem in that the entire device becomes large in size.

The present invention aims to eliminate all such problems.

[Means to resolve the problem]

In order to achieve the above objects, the present invention communicates the pressure oil introduction part and the direction switching part of the rotary valve through a communication oil passage provided in the rotor, and the communication oil passage is This makes it possible to utilize the pressure oil effectively and derive it as an auxiliary source. That is, the hydraulic pressure generator according to the present invention has a rotary valve as a directional control valve built into a support body to which a hydraulic pump and an oil tank containing the hydraulic pump are attached, and the rotary valve of the rotary valve A pressure oil introduction part and a direction switching part are provided at different positions in the axial direction of the rotor, and the two are communicated through a communication oil passage provided inside the rotor, and the rotor is connected to the direction switching part when the rotor is in a neutral position. The present invention is characterized in that a path is provided substantially in the radial direction of the rotor to communicate the pressure oil outlet provided separately from the pressure oil inlet and the communicating oil passage inside the rotor.

[Effect]

With such a configuration, the pressure oil discharged from the hydraulic pump is guided from the pressure oil introduction part of the rotary valve to the direction switching part through the communication oil passage of the rotor. Then, by rotating the rotor from the neutral position, a normal direction switching action is carried out, and the pressure oil in the communicating oil passage is led out of the valve from a required pressure oil outlet.

When the rotor is held in the neutral position, the pressure oil is stopped from being discharged from the pressure oil outlet, but the supply of pressure oil from the hydraulic pump is maintained in the communication oil passage. There is. Therefore, in the neutral position, the pressure oil in the communication oil passage is guided to the pressure oil outlet through a passage provided in a substantially radial direction of the rotor, and is led out from the pressure oil outlet to the outside of the valve.

However, since this communication oil passage communicates the pressure oil introduction part and the direction switching part provided at different positions in the axial direction of the rotor, it is possible to simply connect the pressure oil introduction part and the direction switching part provided at different positions in the axial direction of the rotor. The pressure oil in the communicating oil passage can be reliably taken out to the outside simply by providing a path that is unlikely to interfere with the introduction part or the direction switching part.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

A cylindrical case 2 with a bottom is attached liquid-tightly to one side of an adapter 1 serving as a support body, and an oil tank 3 is formed within the case 2. A hydraulic pump 4 is provided in the center of one side of the adapter 1. The hydraulic pump 4 is, for example, a gear pump with the tip of its drive shaft 4a protruding to the other side of the adapter 1, and the oil sucked up from the oil tank 3 is successively discharged from the discharge port 4b by rotating the drive shaft 4a with an external electric motor or engine. First and second pressure oil inlet and outlet ports 5, 6 are provided on the top surface of the adapter 1.
The pressure oil inlet/outlet ports 5, 6 are opened, and a rotary valve 7 serving as a directional control valve is provided between these pressure oil inlet/outlet ports 5, 6 and the discharge port 4b of the hydraulic pump 4. The rotary valve 7 comprises a sleeve 8 press-fitted and fixed in the mounting hole of the adapter 1, and a rotor 9 rotatably fitted to the inner periphery of the sleeve 8. Inlet/outlet ports 11, 12 communicating with the pressure oil inlet/outlet ports 5, 6, respectively, and tank ports 13, 14 communicating with the oil tank 3 are opened on the inner periphery of the sleeve 8 at the direction switching portion 7a (the portion along the - line in Fig. 1).
A pressure port 15 communicating with the discharge port 4b of the hydraulic pump 4 is provided on the inner peripheral surface of the sleeve 8 at the pressure oil introduction portion 7b (the portion along the line - in FIG. 1).
Thus, this pressure oil introduction portion 7
The direction switching portion 7a and the pressure oil introduction portion 7b are disposed at different positions in the axial direction of the rotor 9. The rotor 9 is provided with a communication oil passage 16 formed in its axial center to connect the direction switching portion 7a and the pressure oil introduction portion 7b, for connecting the inlet/outlet ports 11, 12 to the pressure port 15, and with drain oil circulation grooves 17, 18 for connecting the inlet/outlet ports 11, 12 to the tank ports 13, 14. The rotor 9 is then operated by an operating lever 19.
In other words, in this rotary valve 7, when the rotor 9 is held in the neutral position n shown in Figs. 2 and 3, communication between the pressure oil inlet/outlet ports 5, 6 and the discharge port 4b of the hydraulic pump 4 is cut off, but when the rotor 9 is rotated to the first switching position a shown in Figs. 4 and 5, the first pressure oil inlet/outlet port 5 is connected to the communication oil passage 16 and the pressure port 1.
The second pressure oil inlet/outlet 6 is connected to the discharge port 4b of the hydraulic pump 4 via the second pressure oil inlet/outlet 6.
Conversely, when the rotor 19 is rotated to the second switching position b, the second pressure oil inlet/outlet port 6
is connected to the discharge port 4b of the hydraulic pump 4 via a communication oil passage 16 and a pressure port 15, and
The pressure oil inlet/outlet port 5 communicates with the tank port 13 via a drained oil flow groove 17 .

In such a hydraulic pressure generator, the adapter 1 has a pressure oil outlet 21 independent of the pressure oil inlets 5 and 6, and the rotary valve 7 is held at the neutral position n. Pressure oil outlet 2
1 to the discharge port 4b of the hydraulic pump 4 through the communication oil passage 16. The pressure oil distribution path 22 is formed in the radial direction of the rotor 9 and has one end connected to the pressure oil discharge port 2.
a first pressure oil passage 23 that communicates with the communication oil passage 16 and has its other end open to the inner peripheral surface of the sleeve 8; When the rotor 9 is located at the neutral position n, the two pressure oil passages 23, 2
4 is now matching.

If the configuration is like this, the operation lever 1
By rotating the rotary valve 9 and switching the rotary valve 7, pressure oil is supplied to the actuator etc. from either one of the paired pressure oil inlets 5 and 6, and from the other. Although the drained oil can be returned to the oil tank 3, according to the present invention, even when the valve 7 is held at the neutral position n, the pressure oil discharged from the hydraulic pump 4 can be returned to the oil tank 3. It can be taken out of the apparatus through the provided pressure oil outlet 21 and used as appropriate. Therefore, with such a device, it is possible to increase the utilization of pressure oil without impairing the original function. This can effectively eliminate the inconvenience of having to separately provide a hydraulic pump, oil tank, etc. exclusively for the power steering device in vehicles and the like.

It should be noted that the pressure oil flow path is of course not limited to that of the embodiment described above. For example, as shown in FIGS. 7 and 8, the first pressure oil path 23' may be bifurcated. At the same time, the second pressure oil passage 24' is
Various modifications are possible, such as by providing this structure to reduce flow path resistance.

[Effect of idea]

Since the present invention has the above-described configuration, even when the rotary valve is held in the neutral position and the pressure oil outflow inlet is closed, pressure oil can be taken out from the pressure oil discharge port. Therefore, it is possible to increase the utilization of pressure oil without any loss of original functions, and there is no need to separately install an auxiliary hydraulic pump or oil tank to operate auxiliary equipment, which is an inconvenience. You can easily eliminate the problem.

In addition, since the pressure oil is taken out from the communication oil passage that communicates the pressure oil introduction part and the direction switching part, which are provided at different positions in the axial direction of the rotor, By simply providing a simple path that is unlikely to get in the way, the pressure oil can be extracted. Therefore, compared to a system in which the auxiliary hydraulic circuit is branched from the starting end of the main hydraulic circuit and the auxiliary hydraulic circuit is provided with an on-off valve that opens and closes in conjunction with the directional switching valve of the main hydraulic circuit, the number of parts is far greater. The structure is greatly simplified.
Therefore, the entire device can be made smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, FIG. 3 is a sectional view taken along the line -- in FIG. 1, and FIG. FIG. 5 is a functional diagram corresponding to FIG. 2, FIG. 5 is a functional diagram corresponding to FIG. 3, FIG. 6 is a sectional view corresponding to FIG. 3 showing another embodiment of the present invention, and FIG. FIG. 6 is an action explanatory diagram corresponding to FIG. 5 showing an embodiment. 1...Adapter (support body), 3...Oil tank, 4...Hydraulic pump, 5, 6...Pressure oil inlet,
7... Rotary type valve (switching valve), 7a... Directional switching part, 7b... Pressure oil introduction part, 16... Communication oil passage, 21... Pressure oil discharge port, 22... Pressure oil distribution path (route ).

Claims (1)

[Scope of utility model registration request] In a hydraulic generator in which a rotary type valve is incorporated as a directional control valve in a support body to which a hydraulic pump and an oil tank containing the hydraulic pump are attached, pressure oil inlets are installed at different positions in the axial direction of the rotor of the rotary type valve. and a direction switching section, and the two are communicated through a communication oil passage provided inside the rotor, and the pressure oil inlet is provided separately from a pressure oil inlet connected to the direction switching section when the rotor is in a neutral position. A hydraulic pressure generating device characterized in that a path connecting a pressure oil discharge port and a communication oil passage inside the rotor is provided in a substantially radial direction of the rotor.