JPH0577672U - Fluid control valve - Google Patents

Abstract

(57) [Summary] [Purpose] The state of the fluid does not change due to disconnection of the current-carrying wire and the structure is compact. [Structure] A screw member 2 is rotatably provided in the center of a housing 1, and a spool valve 4 moves in the axial direction as the screw member 2 rotates to open and close a flow passage 31. A vibrating body 6 that vibrates ultrasonically when energized and a ring-shaped rotating body 5 that is urged to rotate in contact with the vibrating body 6 are provided around the screw member 2, and the rotational force of the rotating body 5 is transmitted to the screw member 2 by the gears 71 and 72. To do. When the energization is stopped, the vibration of the vibrating body 6 stops, and the rotating body 5 stops at that position. The spool valve 4 screwed onto the screw member 2 maintains its position, and the fluid state does not change. By combining the vibrating body 6 and the rotating body 5, it is possible to obtain a sufficient driving force with a compact shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure improvement of a fluid control valve which has a compact structure and does not cause fluctuations in a fluid control amount due to disconnection of energizing wires.

[0002]

[Prior Art]

 FIG. 3 shows an example of a fluid control valve that controls hydraulic pressure. In the figure, a spool valve 4 is provided in a cylindrical housing 1 having a flange formed on the outer periphery of an intermediate portion so as to be movable in the axial direction (up and down), and the spool valve 4 abuts on the upper end. It is urged downward by the spring member 91 to close the space between the input port 11 and the output port 12.

An electromagnetic coil 92 is provided on the outer periphery of the upper half portion of the cylindrical housing 1 so as to be covered with a cover body 8, and the energization amount is controlled by an external valve control device 93. When the electromagnetic coil 92 is energized, the spool valve 4 is attracted upward against the spring force of the spring member 91. As the spool valve 4 rises, the connection between the input port 11 and the output port 12 is opened, and the opening between the ports 11 and 12 is changed according to the amount of electricity supplied to the electromagnetic coil 92 to change the output hydraulic pressure.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional structure, when the energization line from the valve control device is disconnected or the energization to the electromagnetic coil is canceled due to a failure of the valve control device or the like, the spool valve immediately causes the spring force to move to the lower end. Since it returns to the closed position, the output hydraulic pressure fluctuates greatly, and for example, the steering force of the power steering suddenly changes. In addition, there is a problem that it is difficult to make the valve body compact because the electromagnetic coil becomes large in size in order to obtain sufficient driving force. It is also known that the spool valve is rotated by the rotation of the motor, but there was a limit to its compactness because an ordinary rotary motor was used.

The present invention solves such a problem, and an object of the present invention is to provide a fluid control valve in which the state of fluid does not change due to disconnection of a current-carrying wire and the structure is compact.

[0006]

[Means for Solving the Problems]

 The structure of the present invention will be described. A screw member 2 is rotatably provided in the center of a housing 1, and the screw member 2 is screwed into the screw member 2 in a state in which the rotation is restricted and moves in the axial direction as the screw member 2 rotates. A spool valve 4 that opens and closes the flow path 31 is provided, and a vibrating body 6 that vibrates ultrasonically when energized and a ring-shaped rotating body 5 that is urged to rotate in contact with the vibrating body 6 are provided around the screw member 2. Means 71, 72 for transmitting the rotational force of the rotating body 5 to the screw member 2 are provided.

[0007]

[Action]

 In the above configuration, when the vibrating body 6 is energized, the rotating body 5 is rotated by a certain angle by the ultrasonic vibration generated according to the current. The rotation causes the screw member 2 to rotate via the transmission means, thereby moving the valve body 4. When the energization is stopped, the vibration of the vibrating body 6 stops, and the rotating body 5 stops at that position. The spool valve 4 screwed onto the screw member 2 maintains its position, and the fluid state does not change.

Further, since it is rotationally biased by the ultrasonic vibration composed of the vibrating body 6 and the rotating body 5, it is possible to obtain a sufficient driving force in a compact shape with few parts.

[0009]

【Example】

 In FIG. 1, a lower half portion of the cylindrical housing 1 is fixed in a liquid-tight manner in a mounting hole of a base body 3, and a cylindrical spool valve 4 is vertically movable in the lower half portion. It is set up. An input port 11 is formed through the cylindrical wall of the lower half of the housing at an opposing position and communicates with an annular groove 32 formed on the inner peripheral surface of the mounting hole. The annular groove 32 constitutes a part of the oil passage 31 provided in the base body 3.

A cylindrical frame member 13 is screwed and fixed in the lower end opening of the housing 1, and the inside of the frame member 13 serves as an output port 12 forming a part of an oil flow path 31. The lower end of the spool valve 4 is in contact with the insertion end of the frame member 13, and a stepped notch is formed in the opposing cylindrical wall at this lower end to form a throttle portion 41.

A female screw portion 4a is formed on the inner peripheral surface of the spool valve 4, and a tip of a screw member 2 having a male screw portion 2a screwed into the female screw portion 4a is screwed in from above. The base end of the screw member 2 projects from the upper end opening of the housing 1, and the gear 72 is fitted therein. A groove 42 extending in the axial direction is formed on the outer peripheral surface of the spool valve 4, and the tip of the stopper pin 14 fixed to the wall of the housing 1 is located in the groove 42 to restrict the rotation of the spool valve 4. is doing.

A small gear 71 meshes with the gear 72 from the outside, and the small gear 71 is fixed to a rotary shaft 81 supported on an inner wall surface of a cover body 8 provided above the housing 1. Has been done. A large-diameter ring-shaped rotating body 5 is provided outside the small gear 71 concentrically with the gear 72 (FIG. 2), and the tooth profile 5a formed on the inner periphery of the small rotating gear 5 meshes with the small gear 71. There is.

A ring-shaped vibrating body 6 is arranged on the outer periphery of the housing 1 below the rotating body 5, and an upper surface of the vibrating body 6 is in contact with a lower surface of the rotating body 5 to which a friction material 51 is joined. A plurality of sets of piezoelectric ceramic plates 61 are bonded to the lower surface of the vibrating body 6 with their positions displaced in the circumferential direction, and ultrasonic vibration is generated by alternating voltage sequentially supplied to each piezoelectric plate 61 by an unillustrated conducting wire. .. The ultrasonic vibration is transmitted to the vibrating body 6 to generate a vibrating wave traveling in a predetermined direction on the upper surface of the vibrating body 6, and the rotating body 5 in contact therewith is rotated. The rotation angle of the rotating body 5 is changed by controlling the frequency of the supply voltage, and the rotation direction is controlled by changing the direction of shifting the phase of the voltage supplied to the piezoelectric plate 61.

The upper surface of the rotating body 5 is biased downward by a disc spring 53 toward a vibrating body via a thrust bearing 52 that abuts on the rotating body 5.

In the fluid control valve having the above structure, when the vibrating body 6 vibrates and the rotating body 5 is rotated by energization from the valve control device, the screw member 2 is rotated via the gears 71 and 72. The spool valve 4, which meshes with, moves up and down according to the rotation angle and the rotation direction of the rotating body 5 according to the supply voltage. As a result, the opening area between the input port 11 and the output port 12 changes, and the hydraulic pressure is changed and adjusted.

In such a structure, even if the energization to the ceramic plate 61 is stopped due to the disconnection of the energization line or the failure of the valve control device, the rotating body 5 maintains the state immediately before the energization is stopped. The position of 4 does not change, and the output hydraulic pressure does not change.

Further, as compared with the conventional example using the electromagnetic coil, the rotary drive unit becomes compact, and the entire fluid control valve is miniaturized.

The present invention can be widely used not only for hydraulic control but also for other fluid control such as oil amount control.

[0019]

[Effect of the device]

 As described above, according to the fluid control valve of the present invention, since the state of the fluid does not change when the energization is stopped, there is no problem that the function of the system using the fluid is lost, and the physique of the control valve itself is reduced. It can be miniaturized.

[Brief description of drawings]

FIG. 1 is an overall sectional view of a fluid control valve showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a schematic overall cross-sectional view of a fluid control valve showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Screw member 31 Oil flow path (flow path) 4 Spool valve 5 Rotating body 6 Vibrating body 71, 72 Gear (rotational force transmitting means)

Claims (1)

[Scope of utility model registration request] 1. A spool, which is provided with a screw member rotatably in the center of a housing, is screwed to the screw member in a state in which the rotation is restricted, and moves axially in accordance with the rotation of the screw member to open and close a flow path. A valve is provided, and a vibrating body that vibrates ultrasonically when energized and a ring-shaped rotating body that is urged to rotate in contact with the vibrating body are provided around the screw member, and means for transmitting the rotational force of the rotating body to the screw member is provided. A fluid control valve characterized by being provided.