JPS6329922Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic rotary actuator operated by hydraulic pressure or the like.

Due to the structure of conventional rotary actuators, the movable range of the rotor side vanes is restricted by the fixed side vanes, so the rotor can rotate up to 270 degrees and cannot rotate beyond that. There is a problem in that it imposes significant restrictions on torsion tests and the like.

The present invention attempts to solve these problems by directly pushing the vanes in the circumferential direction of the rotor using hydraulic pressure, etc., so that the rotor can rotate more than 360 degrees while outputting the desired torque. The purpose is to provide a rotary actuator.

For this reason, the rotary actuator of the present invention includes a cylindrical rotor rotatably provided in a rotor housing space within the actuator body, a vane protruding from the outer circumferential wall of the rotor, and a vane for guiding the vane. A servo valve is provided on the outer side of the actuator body adjacent to the spiral groove, the inner wall of the rotor accommodating space in the actuator body is provided with a spiral groove formed for more than one revolution, and A working fluid supply/discharge passage is formed that communicates the working fluid supply/discharge port at both ends of the spiral groove with the supply/discharge port of the servo valve, and is spline-engaged with one side of the rotor shaft of the rotor. It is characterized by the provision of an adapter that transmits rotational torque and absorbs movement in the axial direction.

Below, a rotary actuator as an embodiment of the present invention will be explained with reference to the drawings.
The figure is a sectional view thereof, and FIG. 2 is a sectional view showing a modification thereof.

As shown in FIG. 1, an actuator body 2 having a cylindrical rotor housing space 1 therein is provided. A cylindrical rotor 3 is rotatably and liquid-tightly provided in this rotor housing space 1. Note that rotor shafts 3a and 3b are protruded from both ends of the rotor 3, respectively.
a and 3b pass through the bearing portion of the actuator main body 2 to the outside of the main body 2.

A vane 4 is protruded from the outer circumferential wall of the rotor 3, and the vane 4 is fluid-tightly engaged with a spiral groove 5 formed on the inner wall of the rotor housing space 1 at a rotation angle of more than 360°. Guides will be provided accordingly.

Furthermore, hydraulic oil supply/discharge ports (working fluid supply/discharge ports) 6, 6' are opened at both ends of this spiral groove 5.
Each hydraulic oil supply/discharge port 6, 6' is connected to a servo valve attached to the outside of the actuator body 2 adjacent to the spiral groove 5 via a hydraulic oil supply/discharge passage (supply/discharge hydraulic fluid passage) 7, 7'. It is connected to the supply/discharge port (not shown) of No.8.

Note that the servo valve 8 is connected to a pump and a reservoir (not shown).

By the way, one of the rotor shafts 3a and 3b (rotor shaft 3a in this embodiment) is configured as an output shaft, and an adapter 9 is attached to the end of this shaft 3a.
are spline engaged as indicated by the symbol S,
It is designed to transmit rotational torque from the rotor shaft 3a and absorb movement in the axial direction.
In addition, this adapter 9 is connected to the actuator main body 2.
The adapter 9 is provided with an engaging member 11 that engages with an annular dovetail groove 10 formed on the outer wall of the actuator body 2, thereby allowing the adapter 9 to rotate while maintaining a desired position relative to the actuator body 2.

Note that the adapter 9 can be connected to a torsion test member fixed to a fixed stand (not shown).

Further, a sensor 12 for detecting the rotation angle of the rotor 3 is attached to the other rotor shaft 3b, and a detection signal from this sensor 12 is sent to a display (not shown), which indicates the rotation angle of the rotor 3. is now displayed.

With the above configuration, when pressure oil is supplied from the hydraulic oil supply/discharge port 6 to the spiral groove 5 through the oil passage 7, for example, the vane 4 is driven by this pressure oil from one end of the spiral groove 5 to the other end. The rotor 3 moves in the direction of arrow A while rotating. At this time, the vane 4 is driven to the other end of the spiral groove 5, causing the rotor 3 to rotate more than 360 degrees.

When the rotor 3 moves while rotating in this manner, the adapter 9 is spline-engaged with the shaft 3a and rotatably engaged with the annular dovetail groove 10 on the outer wall of the adapter body. The adapter 9 rotates in synchronization with the rotation of the rotor 3 while maintaining a desired position, and applies a desired rotational torque using pressure oil to a torsional test member (not shown).

As mentioned above, the rotor 3 and the adapter 9
It can rotate more than 360 degrees, making it possible to perform torsion tests in a range that was previously impossible.

As shown in FIG. 2, two spiral grooves 13 and 14 are formed on the inner wall of the rotor housing space 1 over two or more rotations each, and a vane is formed to liquid-tightly engage each spiral groove 13 and 14. 15 and 16 may be provided on the outer circumferential wall of the rotor 3. In this case, substantially the same effects and advantages as those of the above-mentioned embodiments can be obtained, and there is also the advantage that stable and smooth operation can be ensured.

Reference numerals 17 to 20 in FIG. 2 are hydraulic oil supply and discharge ports (hydraulic fluid supply and discharge ports), and 21 to 24 are hydraulic fluid supply and discharge ports 17.
20 and the servo valve 8 are shown.

Further, instead of using hydraulic oil (pressure oil) as the working fluid, a working fluid such as compressed air can also be used.

As detailed above, according to the rotary actuator of the present invention, the cylindrical rotor is rotatably provided in the rotor housing space within the actuator main body, the vane is provided protruding from the outer peripheral wall of the rotor, A servo valve is provided on the outside of the actuator body adjacent to the spiral groove, which is provided with a spiral groove formed on the inner wall of the rotor housing space in the actuator body for more than one rotation to guide the vane. In addition, a working fluid supply/discharge passage is formed in the actuator body to communicate the working fluid supply/discharge port at both ends of the spiral groove with the supply/discharge port of the servo valve, and a spline is provided on one side of the rotor shaft of the rotor. With a simple structure in which an adapter is provided that is engaged and transmits the rotational torque of the rotor and absorbs the movement in the axial direction, the rotor can be rotated more than 360 degrees while outputting the desired torque. This has the advantage that torsion tests can be conducted over a wider range.

In addition, in the rotary actuator of this invention,
A servo valve is connected directly to the hydraulic oil path.
Since the servo valve is attached to the actuator body near the spiral groove, it does not cause deterioration of characteristics such as response and pressure loss of the device, and does not cause complication of the device.

Furthermore, the hydraulic oil passage in the rotary actuator of the present invention is provided in order to send the hydraulic oil supplied from the servo valve only to the spiral groove and directly rotate the rotor via the vane,
It is not supplied to the working chamber surrounded by the end face of the rotor and the rotor shaft in the rotor housing space,
Since the amount of oil that contributes to the volume increase associated with rotor movement is not required, the desired rotational torque from large to small torque can be achieved while maintaining sensitive responsiveness without causing deterioration of characteristics such as pressure loss. It is possible to produce a special effect of being able to output .

[Brief explanation of the drawing]

The figures show a rotary actuator as an embodiment of the present invention, with FIG. 1 being a sectional view thereof, and FIG. 2 being a sectional view showing a modification thereof. DESCRIPTION OF SYMBOLS 1... Rotor accommodation space, 2... Actuator main body, 3... Rotor, 3a, 3b... Rotor shaft, 4... Vane, 5... Spiral groove, 6, 6'...
Hydraulic oil supply/discharge port as working fluid supply/discharge port, 7, 7'
... Hydraulic oil passage for supply and discharge as a hydraulic fluid passage for supply and discharge,
8... Servo valve, 9... Adapter, 10...
Annular dovetail groove, 11... Engaging member, 12... Angle detection sensor, 13, 14... Spiral groove, 15, 16...
... Vane, 17-20... Hydraulic oil supply/discharge port as a working fluid supply/discharge port, 21-24... Hydraulic oil passage for supply/discharge, A... Rotor movement direction, S... Spline engagement portion.

Claims (1)

[Scope of utility model registration request] A cylindrical rotor rotatably provided in a rotor housing space in the actuator body, a vane protruding from the outer circumferential wall of the rotor, and a rotor rotor that rotates once on the inner wall of the rotor housing space in the actuator body to guide the vane. A servo valve is provided on the outside of the actuator body adjacent to the helical groove, and the actuator body has working fluid supply and discharge ports at both ends of the helical groove. A supply/discharge working fluid path is formed that communicates the supply/discharge port of the servo valve, and is splined to one side of the rotor shaft of the rotor to transmit rotational torque of the rotor and to prevent movement in the axial direction. A rotary actuator characterized by being provided with an absorbing adapter.