JPH01199006A - Oscillating type actuator with built-in position detecting mechanism - Google Patents

Abstract

PURPOSE:To eliminate the need for a special space for installation and to prevent a title device from being exercised by working environment, by a method wherein the position detecting mechanism of an oscillating body is incorporated in the oscillating body. CONSTITUTION:When an oscillating body 3 approaches a stopper 2, a valve body 15a incorporated in the oscillating body 3 is brought into contact with the stopper 2 to release a valve seat 12a. Therefore, a part of pressure fluid in a pressure chamber 5a flows through a passage 18a to the outside, and the swing position of the swing body 3 can be detected. Since a mechanism 7 to detect the position is incorporated in the oscillating body 3, there is no need for an individual space for mounting of a position detecting mechanism, and no influence by working environment is exercised. Further, since a position detecting signal is provided by utilizing a part of pressure fluid fed to a pressure chamber 5a, there is no need to mount an individual means, generating a detecting signal, to the position detecting mechanism 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an oscillating actuator having a built-in position detection mechanism for a W moving body.

[Prior Art] In a vane-type swinging actuator, pressurized fluid is alternately supplied to a pair of pressure chambers partitioned by a vane that constitutes a swinging body and a stopper that regulates the swinging position of the vane. In order to drain the pressure fluid, a directional switching valve is installed in the pressure fluid supply and discharge pipeline, and a one-position detection mechanism detects the swinging position of the vane and drives the directional switching valve, thereby supplying and discharging the pressure fluid to and from the pressure chamber. It is necessary to switch.

Furthermore, in order to operate other equipment at the end of the vane's swing stroke, it may be necessary to detect the swing position of the vane.

The position detection mechanism of the oscillating body in a conventionally known oscillating actuator is a oscillating actuator. Since the position detection mechanism is installed separately outside the engine, a space is required for installing the position detection mechanism, and there is a problem that the position detection mechanism is easily influenced by the working environment.

[Problem to be Solved by the Invention 1] An object of the present invention is to incorporate the position detection mechanism of the oscillating body into the oscillating body, so that no special space is required for installation and the mechanism is not affected by the working environment. An object of the present invention is to provide a swinging actuator having a swinging position detection mechanism.

[Means for Solving the Problems] In order to achieve the above object, a swing type actuator of the present invention includes a swinging body, a stopper for regulating the swinging position of the swinging body, and a swinging body partitioned by the swinging body and the stopper. In the oscillating actuator, the oscillating body includes a plurality of valve seats each communicating with the plurality of pressure chambers separately. and a built-in position detection mechanism consisting of a valve element that opens these valve seats upon contact with the stopper, and a plurality of passages for communicating each of these valve seats with the outside. It is characterized by:

[Function] When pressure fluid is supplied and discharged from a plurality of ports to a plurality of pressure chambers, the ti moving body swings.

When the rocking body approaches the stopper, the valve body built into the rocking body comes into contact with the stopper and opens the valve seat, so that part of the pressure fluid in the pressure chamber flows out through the passage, thereby causing the rocking body to close to the stopper. The swing position of a moving body can be detected.

The above position detection mechanism is built into the oscillator, so there is no need for a separate space for installing the position detection mechanism.
Moreover, it is not affected by the working environment.

Further, since a part of the pressure fluid supplied to the pressure chamber is used to generate the position detection signal, there is no need to provide a separate means for generating the detection signal in the position detection mechanism.

[Embodiment] Figures 1 to 4 show a first embodiment of the present invention in which the swinging actuator is vane-shaped, and the bodies la and lb of this vane-shaped swinging actuator are omitted from illustration. A pair of pressure chambers 5a, which are connected by appropriate means such as
5b, and a pair of ports Eta and 8b for alternately supplying and discharging pressure fluid to and from the pressure chambers 5a and 5b are opened at a position close to the side surface of the stopper 2, and one blade 4 is provided with a swinging motion as described later. A position detection mechanism 7.7 is built-in.

As shown in FIGS. 1 and 2, the vane 4 has a concave portion 10 formed on the circumferential surface of the vane cylindrical portion 3 constituting the vane 3.
, the brazing is airtightly fixed by etc., and the blade 4
Attachment holes 11a and llb for the position detection mechanism 7.7 are opened on the side surface of the position detection mechanism 7.7 at an interval in the axial direction and on opposite sides of each other,
In the mounting holes 11a and llb.

A member 13a that has a through hole whose tip end is gradually reduced in diameter, and valve seats 12a and 12b formed by steps of the through hole.

13b is attached and one member 13a, 13b is attached to the mounting hole 11.
a.

It is covered with a cover 14.14 having an opening fixed to 11b.

Valve bodies 15a and 15b that open and close valve seats 12a and 12b are
The valve seats 12a, 1 are biased in the direction of closing the valve seats by a spring 18, 18 compressed between the force /<-14, 14,
2b is closed, the rods 17a, 1?
b passes through the through hole in an airtight manner, passes through the hole in the blade 4, and protrudes from the side surface of the blade 4 in opposite directions. Also, the reduced diameter part on the rod side of the above-mentioned through hole.

The members 13a, 13b communicate with radial passages 18a, 18b formed in the vane 14 and the vane cylindrical portion 8.

An axial blind hole 2 is provided in one axial center of the vane cylindrical portion 9 and the shirt integrally formed at both ends thereof.
1 and the blind hole 2! A pair of axial passages 23a and 23b are formed by the pipe 22 inserted into the passage 23.
a and 23b communicate with the passages 18a and 18b separately, a double pipe joint is provided at the opening of the blind hole 21, and a thread for screwing the outer pipe 24 is provided at the opening of the pipe 20, and the joint 24 is provided at the open end of the pipe 20.
A mounting part for the inner tube is formed.

The swing position detection mechanism 7.7 is constituted by the valve seats 12a, 12b and the valve bodies 15a, 15b.

Although not shown, the inner and outer pipes of the double pipe joint 24 are connected to a desired device such as a directional control valve for switching the flow direction of the pressure fluid.

Reference numeral 25 in FIGS. 1 and 2 indicates a backing fixed to the tip of the blade 14 by baking or the like, and reference numeral 28 in FIG.
．． 28 and 27.27 are seal members that seal both ends of the vane cylindrical portion 18, and bearings that support the shaft 20.20.

In the first embodiment, the vane 3 rotates and oscillates by alternately supplying pressure chambers from the vanes 8a and 8b to the pair of pressure chambers 5a and 5b.

When the vane 4 approaches the stopper 2 due to the rotational swing of the vane 3, the rod 17a of the valve body 15a comes into contact with the stopper 2 and is pressed to open the valve seat 12a, so that a part of the pressure fluid in the pressure chamber 5b passes through the passage. 18a and 23a, and when the supply and discharge of the pressure fluid to the pressure chambers 5a and 5b is reversed, a part of the pressure fluid in the pressure chamber 5a flows into the passages 18b and 23.
It is discharged outside the body through b.

Therefore, the swing position of the vane can be detected by using these pressure fluid swing position detection signals.

In the first embodiment, since the position detection mechanism 7 is built into the blade 4, there is no need for a special space for installing the position detection mechanism and it is not affected by the working environment.

Further, since the exhaust gas discharged to the outside after driving the vane 3 is effectively used as a signal for position detection, there is no need to attach a means for generating a detection signal to the position detection mechanism.

Furthermore, by appropriately selecting the protrusion lengths of the rods 17a, 17b into the pressure chambers 5a, 5b, the rods 17a, 17b may be
It is also possible to detect the position of

FIG. 5 shows a second embodiment of the present invention, in which the passages 23a and 23b are connected to the vane cylindrical portion 9 and the shaft 2.
The passages 32a and 32b are formed by a blind hole 21 provided in one side of the body 1 and a pipe 31 inserted into the blind hole 21, and one end opens into the passage 32a;
The opening end of the pipe 31 is closed with a sealing member.

The other structure and operation of the second embodiment are the same as the first embodiment except that the 1-position detection signal can be taken out from the outer periphery of the body. Explanation will be omitted.

Note that the oscillating actuator of the present invention is not limited to a vane type actuator in which the oscillating body rotates and oscillates, but includes oscillating actuators such as a rack and pinion type in which the oscillating body linearly oscillates.

[Effects of the Invention] The oscillating actuator of the present invention has a position detection mechanism built into the oscillating body for detecting the oscillating position of the oscillating body, so there is no space outside the oscillating actuator for installing the position detection mechanism. is not necessary, and the position detection mechanism is not affected by the working environment.

Further, since a part of the pressure fluid supplied to the pressure chamber is used as a position detection signal, there is no need to provide a separate means for generating a detection signal in the position detection mechanism.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIGS. 1 and 2 are enlarged cross-sectional views of the vanes at different positions in the first and second embodiments of the invention, and FIG. FIG. 4 is a cross-sectional plan view of the essential parts of the same, and FIG. 5 is a vertical cross-sectional front view of the second embodiment. 211...Stotsuba, 3...Bane. 5a, 5b...pressure chamber, 8a, 8b...port. 7...Position detection mechanism. 12a, 12b* * ・Valve seat, 15a, 15b*
e a Valve body, 18a, 18b, 23a, 23b, 32
a, 32b, 33a, 33b* a passage. Figure 3

Claims (1)

[Claims] 1. A rocking body, a stopper that regulates the rocking position of the rocking body, a plurality of pressure chambers partitioned by the rocking body and the stopper, and a plurality of ports that supply and discharge pressure fluid to and from these pressure chambers. In the oscillating actuator, the oscillating body has a position detection mechanism comprising a plurality of valve seats each communicating with the plurality of pressure chambers, and a valve body that opens these valve seats by contact with the stopper. A rocking actuator characterized by having a built-in valve seat and a plurality of passages for communicating each valve seat with the outside.