JPH05256304A - Rotary controlling valve - Google Patents

Abstract

PURPOSE:To improve accuracy in oil pressure control by slidably fitting a hollow cylindrical inner rotor which is slidably fitted in a hollow cylindrical outer roller having a predetermined annular groove for oil and further having predetermined annular change-over groove and communication groove, in a hollow cylindrical casing having a predetermined port. CONSTITUTION:An inner rotor 12 is rotated by a predetermined angle from an initial state in which the circumferential surface side of an oil port 24 for pressurized oil and oil port 25 for a tank of an outer rotor 11 are closed by means of a partition wall pin 31 of the inner rotor 12. Then, the partition wall pin 31 is removed out of the respective oil ports 24, 25. The oil ports 24, 25 of the outer rotor 11 are opened to control groove parts 28a-28d of the inner rotor 12. Thus, pressurized oil is supplied to an actuator through a pressurized oil port P of a casing 11, an annular groove 20, connection groove 26 and oil port 24 of the outer rotor 11, control grooves 28a-28d of the inner rotor 12 opened to the oil port 24, connection groove 32, controlling annular groove 30 and pressurized oil sending port B. Thus, allowable pressure can be increased to the same pressure as that in a spool valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary valve used for hydraulic control.

[0002]

2. Description of the Related Art A conventional rotary valve is one in which the direction of an oil passage is switched by the rotation of a spool which is rotatably slidably arranged inside a casing. For example, one shown in FIG. 8 is widely known. In the figure, 1 is a casing, 2 is a spool, and the casing 1 has a pressure oil port P, a tank port T,
A hydraulic oil delivery port A to the hydraulic system and a hydraulic oil return port B from the hydraulic system are provided, and the spool 2 has four flow passages 3a to 3d along the axial direction and a penetrating passage for communicating between the opposed flow passages. Paths 4a, 4b are provided.

In the state shown in FIG. 8, the pressure oil port P and the pressure oil delivery port A are in communication with each other, and the tank port T and the pressure oil return port B are in communication with each other in addition to the states shown in the drawing depending on the rotational position of the spool 2. It is possible to take a block state in which the ports are closed, and a state in which the pressure oil port P and the pressure oil return port B are in communication with the tank port T and the pressure oil delivery port A.

[0004]

However, in the above-mentioned conventional rotary valve and other conventionally known rotary valves, the allowable pressure is lower than that of the spool valve in which the spool reciprocates in the axial direction of the casing, In addition, since the controllability by the opening of the port is low, it is difficult to use it for flow rate control.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a rotary control valve that can be used for controlling a high-pressure fluid.

[0006]

In order to achieve the above object, a rotary control valve according to the present invention has a casing having a hollow cylindrical portion therein, and a hollow cylindrical outer rotor slidably fitted in the casing. And a cylindrical inner rotor that is slidably fitted into the outer rotor, and the casing includes a pressure oil port and a tank port that are located adjacent to each other, and a pressure oil delivery port that is located between both ports. And the pressure oil return port, the outer rotor corresponds to the pressure oil port annular groove, the tank port annular groove, the pressure oil delivery port annular groove and the pressure oil return port annular groove with the respective ports of the casing. At least a pair of oil passages for pressure oil and a tank which are provided at the position and are located on the same circumference between the annular groove for pressure oil port and the annular groove for tank port and penetrate to the inner peripheral surface. A hydraulic oil passage opening is provided, and both oil passage openings are alternately connected to the pressure oil port annular groove and the tank port annular groove, and the pressure oil sending port annular groove and the pressure oil return port annular groove are The inner rotor has a plurality of connecting oil passage openings, and the inner rotor has a switching annular groove provided at a position corresponding to the pressure oil passage and the tank oil passage opening, and the pressure oil delivery port annular passage. The control annular groove provided at a position corresponding to the groove and the pressure oil return port annular groove, and the connecting groove connecting the switching annular groove and the control annular groove, and in the switching annular groove The switching annular groove is divided by a land portion having the same shape as the opening shape of both the oil passage openings arranged corresponding to the pressure oil passage and the tank oil passage opening.

[0007]

1 is an assembled sectional view of a rotary control valve according to an embodiment of the rotary control valve of the present invention, FIG. 2 is an exploded perspective view showing an outer rotor and an inner rotor, and FIG. It is an assembly sectional view of an outer rotor and an inner rotor along a line S.

The rotary valve of this embodiment has a casing 10
The outer rotor 11 is rotatably fitted therein, and the inner rotor 12 is rotatably fitted inside the outer rotor 11. Outer rotor 11
The inner rotor 12 and the inner rotor 12 are respectively provided with support shafts 13 and 14, and the cover 1 is bolted to the casing 11.
5, 15 and 15 are projected to the outside, and are supported by bearings 16 and 16 provided inside the cover 15.

The casing 11 has a hollow cylindrical portion 17 therein, and forms a pressure oil port P, a tank port T, a pressure oil return port A and a pressure oil delivery port B. The pressure oil port P and the tank port T are located on the central side in the axial direction,
The pressure oil return port A and the pressure oil delivery port B are located on the axial end side so as to sandwich the pressure oil port P and the tank port T. The outer shape of the casing 11 does not have to be a cylindrical shape.

The outer rotor 11 includes a body portion 18 and a lid portion 1.
9 and 9 to form a bottomed hollow cylindrical shape, and the outer peripheral surface is slidably fitted into the inner peripheral surface of the hollow cylindrical portion 17 of the casing 11. As shown in detail as a development view in FIG. 4, the body portion 18 of the outer rotor 11 is provided with four annular grooves 20 to 23 at positions corresponding to the ports P, T, A, and B of the casing 11. .. The pressure oil port annular groove 20 and the tank port annular groove 21 are positioned on the same circumference to form a pair of pressure oil oil passage openings 24, 2 respectively.
4 and tank oil passage openings 25, 25 are provided. These oil passage openings 24 and 25 penetrate to the inner peripheral surface, and the connection groove 26.
.. by setting the oil passage 24 for pressure oil to the annular groove 20 for pressure oil port
The tank oil passage port 25 communicates with the tank port annular groove 21. Further, the pressure oil return port annular groove 22 and the pressure oil delivery port annular groove 23 are formed with a plurality of connecting oil passage openings 27 penetrating to the inner peripheral surface.

As shown in detail in a developed view in FIG. 5, the inner rotor 12 has a switching annular groove 28 provided at a position corresponding to the oil passage port 24 for the pressure oil and the oil passage port 25 for the tank, and for the pressure oil return port. Annular groove 22 and annular groove 2 for pressure oil delivery port
3, and the switching annular groove 28 is divided into four by four partition pins 31 ... The surface of which forms a land portion. Then, the control groove portion 2 which is a divided portion of the switching annular groove 28.
8a, 28b, 28c, 28d are alternately connected to the control annular grooves 29, 30 by a connecting groove 32. See also FIG.
2, the diameter W1 of the partition pin 31 is larger than the width W2 of the switching annular groove 28, and as shown in FIGS. 1 and 3, the pressure oil passage 24 and the tank oil passage 25 of the outer rotor 11 are shown. The opening diameter is equal to the opening diameter of the outer rotor 11 and the relative rotation angle difference between the outer rotor 11 and the inner rotor 12 causes an opening portion X having an area proportional to the angle difference as shown in FIG. The partition pin 31 is formed, for example, by punching a round bar material into the switching annular groove 28 and cylindrically polishing the top surface along the surface of the inner rotor 12, but it goes without saying that other means may be used.

Next, the operation of the rotary control valve according to this embodiment will be described. In the following, the pressure oil return port A and the pressure oil delivery port B of the casing 11 are connected to a hydraulic actuator such as a hydraulic cylinder or hydraulic motor, and the support shaft 14 of the inner rotor 12 is driven by a drive source such as a pulse motor or hydraulic motor. Will be described as a state in which the support shaft 13 of the outer rotor 11 is rotated according to the operation amount of the hydraulic actuator, that is, feedback is applied.

First, the oil passage port 2 for pressure oil of the outer rotor 11
4 and the inner peripheral surface side of the tank oil passage port 25 is closed by the partition pin 31 of the inner rotor 12,
The drive source is rotationally driven to rotate the inner rotor 12 by a predetermined angle. Then, the positions of the pressure oil passage 24 and the tank oil passage 25 and the partition pin 31 are displaced, and the pressure oil passage 24 and the tank oil passage 25 of the outer rotor 11 are moved to the control groove portions 28a and 28b of the inner rotor 12. , 28c, 2
Open to 8d. Then, the pressure oil supplied through the pressure oil port P of the casing 11 passes through the pressure oil port annular groove 20, the connecting groove 26, and the pressure oil oil passage port 24 of the outer rotor 11 to switch the inner rotor 12. Annular groove 2
8, specifically, the two control groove portions of the control groove portions 28a to 28d in which the oil passage 24 for pressure oil is open, the control groove portion 30 through the connecting groove 32, and further for connecting. The oil enters the annular groove 23 for the pressure oil delivery port of the outer rotor 11 through the oil passage port 27, is supplied from the pressure oil delivery port B to the hydraulic actuator, and drives the hydraulic actuator.

At the same time, the pressure oil returned from the hydraulic actuator is transferred from the pressure oil return port A to the pressure oil return port annular groove 2
2, connection oil passage port 27, control annular groove 29, connection groove 32
Through the switching annular groove 28, specifically the control groove 28
The tank oil passage opening 25 of a to 28d is open 2
It enters into one control groove portion, passes through the tank oil passage port 25, and is discharged to a tank (not shown) through the tank port T.

At this time, the inner rotor 1 by the drive source
The drive amount of 2 and the operation amount of the hydraulic actuator can be made to have a substantially linear relationship. For example, when the pulse motor as a drive source is rotated by one pulse, the inner rotor 12 is rotated by an angle corresponding to the one pulse, and the oil passage 24 for pressure oil and the oil passage 25 for tank are set to the switching annular groove 28. The inner rotor 12 opens in proportion to the rotation angle of the inner rotor 12. As described above, the area of the opening X is the inner rotor 1
2, the outer rotor 11 follows the rotation of the inner rotor 12, and the partition pin 31 closes the opening X with a predetermined delay to supply the pressure oil. , The hydraulic actuator is rotationally driven by one pulse corresponding to one pulse because it moves in the direction of stopping the discharge.

Contrary to the above description, the outer rotor 11 may be the driving side and the inner rotor may be the driven side.

[0017]

As described above, the rotary control valve according to the present invention has a casing having a hollow cylindrical portion therein, a hollow cylindrical outer rotor slidably fitted in the casing, and the outer rotor. Since it is composed of a cylindrical inner rotor that is slidably fitted inside, the allowable pressure can be increased even with a rotary valve in the same way as with a spool valve. Since the change in the opening area of both oil passage openings is controlled by the partition wall portion having the same area and arranged corresponding to the passage opening and the tank oil passage opening, there is an effect that high precision control can be realized.

[Brief description of drawings]

FIG. 1 is an assembled sectional view of a rotary control valve according to an embodiment of the rotary control valve of the present invention.

FIG. 2 is an exploded perspective view showing an outer rotor and an inner rotor.

3 is an assembled sectional view of an outer rotor and an inner rotor taken along the line S-S in FIG.

FIG. 4 is a development view of a side wall surface of the outer rotor.

FIG. 5 is a development view of a side wall surface of the inner rotor.

FIG. 6 is a plan view showing a dimensional relationship between the switching annular groove and the partition pin.

FIG. 7 is a plan view showing an opening control state of an oil passage port by a partition pin.

FIG. 8 is a sectional view showing a structure of a conventional rotary valve.

[Description of Reference Signs] 10 casing 11 outer rotor 12 inner rotor 13, 14 support shaft 17 hollow cylindrical portion of casing 20 pressure oil port annular groove 21 tank port annular groove 24 pressure oil oil passage opening 25 tank oil passage opening 26 connection Groove 22 Annular groove for pressure oil return port 23 Annular groove for pressure oil delivery port 27 Oil passage port for connection 28 Annular groove for switching 29, 30 Annular groove for control 31 Partition pin 32 Connection groove P Pressure oil port T Tank port A Pressure oil Return port B Pressure oil delivery port

Claims (1)

[Claims] 1. A casing comprising a hollow cylindrical portion inside, a hollow cylindrical outer rotor slidably fitted in the casing, and a cylindrical inner rotor slidably fitted in the outer rotor. The casing includes a pressure oil port and a tank port that are adjacent to each other, and a pressure oil delivery port and a pressure oil return port that are located on both sides of the ports, and the outer rotor has an annular groove for the pressure oil port,
An annular groove for the tank port, an annular groove for the pressure oil delivery port and an annular groove for the pressure oil return port are provided at positions corresponding to the respective ports of the casing, and between the annular groove for the pressure oil port and the annular groove for the tank port. At least a pair of oil passages for the pressure oil and the oil passage for the tank which are located on the same circumference and penetrate to the inner peripheral surface, and both oil passages are formed in the annular groove for the pressure oil port and the annular groove for the tank port. The pressure oil delivery port annular groove and the pressure oil return port annular groove that are alternately connected have a plurality of connection oil passage openings that penetrate to the inner peripheral surface, and the inner rotor is the pressure oil oil passage opening. And a switching annular groove provided at a position corresponding to the tank oil passage opening, a control annular groove provided at a position corresponding to the pressure oil delivery port annular groove and the pressure oil return port annular groove, and the switching A connecting groove for connecting the annular groove and the control annular groove, In the switching annular groove, the switching annular groove is divided by a land portion having the same shape as the opening shape of both the oil passage openings arranged corresponding to the pressure oil passage and the tank oil passage opening. A rotary control valve characterized in that