JPH0341203A - Rotary actuator - Google Patents

Abstract

PURPOSE:To change rotary starting position of an output axle by making it possible to rotate or fix a rotary member against a casing by way of providing the rotary member to regulate the movement direction of a piston as well as engaging the piston with a chamber, rotating and driving the piston. CONSTITUTION:When a rotary member 4 is fixed in a casing 1 with tightening members 9a, 9b, a spline 12 formed on the rotary member 4 is practically integrated with the casing 1. Consequently, a piston 5 is rectilinearly moved in the direction of (a), (b) by way of engaging a spline 16 formed on the piston 5 with the spline 12. At the time of the removal of tightening, the rotary member 4 is rotated with a handle 13 as desired, and its rotation is transmitted to the piston 5 through the splines 12, 16 and then an output axle 6 is rotated furthermore through screw parts 17, 18. Accordingly, it is possible that the output axle 6 sets a new rotary starting point against the casing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a rotary actuator for converting reciprocating motion of a piston housed in a casing into reciprocating rotational motion of an output shaft.

<Prior Art> Conventionally, there are lid opening/closing devices, object reversing devices, circular table reciprocating devices, etc. that accomplish a desired task by reciprocating a certain angle range. A rotary actuator is generally used as a driving means for driving these devices.

The configuration of a typical rotary actuator currently used will be explained with reference to the drawings.

FIG. 6 shows a rotary actuator driven by pressure oil. In the figure, a chamber 52 is formed inside a casing 51. Further, a female screw portion 51a having a predetermined lead is formed in a part of the inner circumferential surface of the casing 51, and a sliding surface for a piston 55c is formed in the remaining portion.

Both ends of the casing 51 are closed by covers 53a and 53b, so that the chamber 52 is configured like a closed room. An output shaft 54 having an axis partially aligned with the axis of the chamber 52 is rotatably mounted on the chamber. A spline 54a is formed at a predetermined position on the outer circumference of the output shaft 54.

A cylindrical piston member 55 is disposed on the outer periphery of the output shaft 54. A spline 55a is formed on the inner periphery of the piston member 55 and meshes with a spline 54a formed on the output shaft 54. Further, a male screw portion 55b is formed on the outer periphery and meshes with a female screw portion 51a formed on the inner peripheral surface of the casing 51, and a piston 55C is formed on the end portion. The chamber 52 has a piston 55C.
It is divided into two chambers 52a and 52b by.

In the rotary actuator configured as described above, when pressure oil is supplied to the chamber 52a, the piston member 55 moves in the direction of the arrow j. At this time, the male threaded portion 55b formed on the piston member 55 meshes with the female threaded portion 51a formed on the casing 51, so that the piston member 55
Rotation occurs in the direction of arrow 1, and this rotation is transmitted to the output shaft 54 via the splines 55a and 54a, thereby causing the output shaft 54 to rotate in the direction of the arrow l. Also chamber 52b
When pressure oil is supplied to the piston member 55, the piston member 55 rotates in the direction of the arrow m while moving in the direction of the arrow. This rotation causes the output shaft 54 to rotate in the direction of arrow m. That is, the reciprocating motion of the piston member 55 can be converted into the reciprocating rotational motion of the output shaft 54.

<Problems to be Solved by the Invention> In the conventional rotary actuator described above, since the rotation of the piston member is regulated by the female thread formed in the casing, the rotation start point (rotation end point, hereinafter referred to as the rotation end point) of the output shaft is restricted. (same) is set with the casing as a reference, so unless the meshing position between the piston member and the casing is changed, the rotation start point will be at a constant position, and there is a problem that this position cannot be changed. .

In addition, in the above-mentioned conventional rotary actuator, the amount of rotation (rotation angle, same hereinafter) of the output shaft is determined by the stroke of the piston member and the lead of the threaded part, so it is always constant, and it is not possible to change the amount of rotation. The problem is that it is not possible.

An object of the present invention is to provide a rotary actuator that can change the position of the rotation start point of an output shaft with respect to a reference casing, and a rotary actuator that can change the amount of rotation of the output shaft within a set range. It is something to do.

Means for Solving the Problems> In order to solve the above problems, a rotary actuator according to the present invention houses a piston and an output shaft meshing with the piston in a chamber formed inside a casing, and provides a rotary actuator for reciprocating the piston. In a rotary actuator configured to convert movement into a reciprocating rotational movement of an output shaft, the rotary actuator meshes with the piston in the chamber to rotationally drive the piston and to define the direction of movement of the piston. Provide the parts,
The rotating member is configured to be rotatable and fixed to the casing.

Another rotary actuator is a rotary actuator configured to house a piston and an output shaft meshing with the piston in a chamber formed inside a casing, and convert the reciprocating movement of the piston into reciprocating rotational movement of the output shaft. In this configuration, a regulating member is provided in the chamber to come into contact with the piston to regulate the stroke limit of the piston.

Still another rotary actuator is a rotary actuator configured to house a piston and an output shaft meshing with the piston in a chamber formed inside a casing, and convert the reciprocating movement of the piston into reciprocating rotational movement of the output shaft. A rotating member is provided in the chamber to mesh with the piston to rotationally drive the piston and to define the direction of movement of the piston, and a rotating member that comes into contact with the piston to regulate the stroke limit of the piston. A regulating member is provided, and the rotary member is configured to be rotatable and fixed to the casing.

<Operation> According to the first means, in the rotary actuator (hereinafter simply referred to as "actuator") that converts the reciprocating movement of the piston into the reciprocating rotational movement of the output shaft, A rotary member is provided that rotationally drives the piston and defines the direction of movement of the piston, and the rotary member is configured to be rotatable and fixed to the casing, so that when the rotary member is fixed to the casing, By defining the moving direction of the piston by the rotating member, the movement of the piston can be converted into a rotating movement of the output shaft. Further, when the rotating member is rotated relative to the casing, the output shaft can be rotated by rotating the piston with the rotating member. That is,
The output shaft can be rotated without changing the position of the piston relative to the casing, and therefore the position of the rotation start point of the output shaft relative to the casing can be changed.

According to the second means, the actuator that converts the reciprocating movement of the piston into the reciprocating rotational movement of the output shaft is provided with a regulating member that comes into contact with the piston to regulate the stroke limit of the piston. Therefore, the stroke limit of the piston, that is, the movement range of the piston can be set to a desired range within the initially set movement range by the regulating member. Therefore, the amount of rotation of the output shaft can be set to an amount that corresponds to the movement range of the piston.

According to the third means, in the actuator that converts the reciprocating movement of the piston into the reciprocating rotational movement of the output shaft, the actuator meshes with the piston to rotationally drive the piston and also defines the direction of movement of the piston. The rotating member is provided with a rotating member for controlling the piston, and a regulating member for regulating the stroke limit of the piston by coming into contact with the piston, and the rotating member is configured to be rotatable and fixed relative to the casing. By rotating the movable member, the rotation starting point of the output shaft relative to the casing can be changed to a desired position, and by regulating the stroke limit of the piston with the regulating member,
The amount of rotation of the output shaft can be set according to the stroke range of the piston.

<Example> Hereinafter, one example of the actuator according to the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of the actuator, FIG. 2 is a view taken along the line m-n in FIG. The figure is an explanatory diagram of a bearing member and a closing member.

In the figure, an actuator A includes a rotating member 4, a piston 5, a rotating member 3, and a regulating member 3 mounted in a chamber 2 formed inside a casing 1 in order from the end la side of the casing 1. Output shaft 6.
A bearing member 7 is housed therein, and these members are arranged at predetermined positions by fixing a closing member 8 to the end portion 1b of the casing 1.

First, each member constituting the actuator A will be explained in detail.

The casing l is constituted by a cylindrical member.

A hole IC for rotatably fitting the rotating member 4 is formed in the end portion la of the casing 1, and is continuous with the chamber 2, and a slot 1d is formed corresponding to the hole 1C. ing.

Tightening members 9a and 9b for tightening and fixing the rotary member 4 fitted in the hole IC are fixedly provided at the end portion 1a of the casing 1 at positions sandwiching the slot 1d.

A hole is formed in the tightening member 9a, and a female thread is formed in the tightening member 9b.

Then, by tightening the pickpocket 5IIld with the bolts 9C attached to the tightening members 9a and 9b, the rotating member 4 fitted in the hole IC is fixed to the casing 1, and the pin 1-9C is loosened. to release the fixation of the rotating member 4,
The rotating member 4 is configured to be able to rotate.

An opening 10 is formed inside the end 1b of the casing 1, and is continuous with the chamber 2, and into which the bearing member 7 having a larger diameter than the chamber 2 is fitted, and the end of the opening 10 A threaded portion 10a for fixing the closing member 8 is formed in the hole. Further, a flange le for attaching the casing 1, that is, the actuator A to a machine frame (not shown) is fixed to the end portion 1b. Further, the casing 1 is formed with ports 11a and 11b for supplying or discharging pressure oil to positions corresponding to chambers 2a and 2b, which will be described later.

Next, the rotating member 4 accommodated in the chamber 2 and the rotating member 4
The configuration of the regulating member 3 attached to the vehicle will be explained with reference to FIG.

In the figure, the rotating member 4 is composed of a shaft portion 4a and a meshing portion 4b having a spline 12 formed on its inner peripheral surface. The shaft portion 4a fits into a hole 1c formed in the casing l, and the meshing portion 4b is disposed within the chamber 2.

A handle 13 for rotating the rotating member 4 is attached to the end 4c of the shaft portion 4a.

This handle 13 is used to rotate the rotating member 4 that is released from the fixation by the fastening members 9a and 9b when changing the position of the rotation start point of the output shaft 6. For this reason, it is preferable that the handle 13 be detachably attached to the end portion 4c of the rotating member 4. Alternatively, for example, the end portion 4c may be formed into a square or hexagonal shape so that it can be rotated with a spanner or the like.

The meshing portion 4b is formed in a cylindrical shape. Teething part 4b
The outer diameter of the chamber 2 is slightly smaller than the diameter of the chamber 2.

a spline 12c formed on the inner circumferential surface of the meshing portion 4b;
When the rotating member 4 is fixed to the casing l by meshing with a spline 16 formed on the outer peripheral surface of the piston 5, the movement direction of the piston 5 due to the action of pressure oil is directed by the spline 12.
．． 16, that is, the axial direction of the chamber 2, and when the rotating member 4 is rotated by the handle 13,
It has a function of transmitting the rotation of the rotation member 4 to the piston 5.

A hole 14 is formed that passes through the shaft portion 4a in the axial direction and into which the regulating member 3 is fitted. A threaded portion 14a is formed at one end of the hole 14, and a guide portion 14 is formed at the other end.
b is formed.

A regulating member 3 that comes into contact with the contact surface 5a of the piston 5 to regulate the stroke limit of the piston 5 is mounted in the hole 14 so as to be movable in the axial direction.

The regulating member 3 includes a threaded portion 3a that is screwed into a threaded portion 14B formed in the hole 14 of the rotating member 4, a chamfered portion 3b formed continuously with the threaded portion 3a, and a contact surface 5a of the piston 5. and a contact portion 3c that comes into contact with the contact portion 3c. Further, a lock nut 15 is screwed into the threaded portion 3a.

In the regulating member 3 configured as described above, when the lock nut 15 is loosened and the regulating member 3 is rotated using a spanner or a handle attached to the chamfered portion 3b,
The contact portion 3c protrudes into and out of the chamber 2 along the hole 14. When the abutting portion 3c is projected into the chamber 2, the corresponding abutting portion 3c
comes into contact with the contact surface 5a of the piston 5, thereby regulating the stroke limit of the piston 5.

Next, the structure of the piston 5 will be explained with reference to FIG.

As shown in the figure, the piston 5 is formed into a cup shape.

A contact surface 5a that comes into contact with the contact portion 3c of the regulating member 3 is formed on the end surface of the piston 5. Further, on the outer peripheral surface of the piston 5 on the contact surface 5a side, a spline 16 is formed which meshes with the spline 12 formed on the rotating member 4, and on the open surface side, a piston portion 5b is formed. There is.

On the inner circumferential surface of the piston 5 on the open surface side, a plurality of spiral protrusions having a predetermined lead, that is, female threaded portions 17 are formed over a predetermined length range in the axial direction.

Further, a cavity 5d is formed between the female screw portion 17 and the bottom surface 5C.

The contact surface 5a, both side surfaces of the piston portion 5b, and the bottom surface 5c function as pressure receiving surfaces for pressure oil. The empty chamber 5d also has the function of accommodating the output shaft 6 when the piston 5 moves.

The 11 threaded portion 17 meshes with a male threaded portion 18 formed on the outer periphery of the output shaft 6 to convert the movement of the piston 5 in the axial direction into rotation of the output shaft 6.

Next, as shown in FIG.
8, a flange 6a and an output portion 6b formed continuously. In addition, the output shaft 6 has a communication hole 6c for allowing pressure oil to flow into the cavity 5d formed in the piston 5.
is formed.

A keyway is formed in the output portion 6b, and is configured to transmit the rotational force of the output shaft 6 to a driven object via the key. The configuration of the output section 6b can adopt a conduction method other than key conduction, for example, it can be formed into a tapered shaft, or it can be formed with a chamfer.

The flange 6a has a function of restricting movement of the output shaft 6 in the axial direction by coming into contact with the bearing member 7 and the closing member 8 fitted in the opening 10 of the casing l. Therefore, when the movement of the piston 5 is transmitted to the output shaft 6, the shaft 6 is configured to perform only a rotational movement.

Next, as shown in FIG. 5, the bearing member 7 has a flange 7a formed on its outer periphery, and a shaft hole 7b for rotatably supporting the output shaft 6 formed on its inner periphery.

The bearing member 7 is fitted into an opening 10 formed in the casing 1. The bearing member 7 is connected to the closing member 8.
A chamber 2 formed with dimensions smaller than the opening 10 by
By being pressed to the side, movement and rotation in the axial direction are prevented.

Next, as shown in FIG. 5, the closing member 8 has a pressing surface 8a formed on its end surface for pressing the bearing member 7, and a threaded portion 10 formed in the opening 10 of the casing 1 on its outer peripheral surface.
A threaded portion 8b is formed to be screwed into the portion a. Further, inside the closing member 8, on the pressing surface 8a side, there is a storage chamber 8C for accommodating the flange 6a of the output shaft 6 in cooperation with the bearing member 7.
A shaft hole 8d for supporting the output shaft 6 is formed continuously with the housing chamber 8c.

Incidentally, in FIG. 1, numeral 19 is an O-ring for preventing leakage of pressure oil.

In order to configure the actuator A using the members configured as described above, the rotating member 4 is inserted into the chamber 2 through the opening 10 formed in the casing 1, and the shaft portion 4a is made to protrude from the hole 1c to the outside of the casing 1.

Next, the piston 5 is inserted into the chamber 2, and the piston 5 is inserted into the chamber 2.
A spline 16 formed on the rotating member 4 is brought into mesh with a spline 12 formed on the rotating member 4. At this time, spline 12.
The gaps between the tips of the teeth and the bottoms of the teeth created by the 16 teeth form flow paths for the flow of pressure oil. Further, the chamber 2 is divided into two chambers 2a and 2b by the piston portion 5b of the piston 5.
divided into

Next, the bearing member 7 is fitted into the opening lO, and the output shaft 6 is fitted into the chamber 2 through the shaft hole 7b of the bearing member 7.
The male threaded portion 1B formed on the output shaft 6 is brought into mesh with the female threaded portion 17 formed on the piston 5.

Next, the closing member 8 is screwed into the opening lO, and the chamber 2 and the opening 1 are closed.
The chamber 2 is closed by holding each member inserted into the chamber 2 at a predetermined position.

Further, the regulating member 3 is screwed into the hole 14 formed in the rotating member 4, and fixed at a predetermined position by the rotor screw 5. Then, by applying a load to the output portion 6b of the output shaft 6 and rotating the rotating member 4 in a certain direction using the handle 13, the piston 5
is moved to a predetermined position, that is, the position shown in FIG. 1, and the rotating member 4 is fixed to the casing 1 by tightening the tightening members 9a and 9b with the bolt 9c.

It is possible to configure actuator A through the above steps. Furthermore, it goes without saying that a plurality of the above steps can be carried out simultaneously.

In the actuator A configured as described above, when pressure oil is supplied from the port 11a to the chamber 2a, this pressure oil acts on the side surface (left side surface in the figure) of the piston portion 5b formed in the piston 5. , acts on the contact surface 5a formed on the piston 5 through the gap formed in the meshing part of the spline 12.16.

At this time, since the rotating member 4 is fixed to the casing 1, the moving direction of the piston 5 is defined by the splines 12, 16, and moves linearly within the chamber 2 in the direction of the arrow a.

As the piston 5 moves in the direction of arrow a, the male threaded portion 18 of the output shaft 6 that meshes with the female threaded portion 17 formed on the piston 5 has a circumferential direction corresponding to the lead angle of the threaded portion 17.18. A force component is applied, and the output shaft 6 is rotated in the lead direction of the threaded portion 17, 18 by the force component. That is, the threaded portion 17
．． When the output shaft 18 has a right-hand screw, the output shaft 6 rotates in the right direction (direction of arrow C) when viewed from the front, and when it has a left-hand screw, it rotates in the opposite direction (direction of arrow d).

After the piston 5 reaches its stroke limit in the direction of arrow a,
When pressure oil is supplied from the bow H1b to the chamber 2b, this pressure oil acts on the side surface (right side in the figure) of the piston portion 5b and passes through the circulation hole 6C formed in the output shaft 6 to the bottom surface 5C of the piston 5. It acts on Therefore, the piston 5 moves linearly in the direction of the arrow. As the piston 5 moves in the direction indicated by the arrow A, the output shaft 6 rotates in a direction corresponding to the lead direction of the threaded portion 17, 18 (in the direction of the arrows d and c).

As described above, as the piston 5 reciprocates linearly in the directions of arrows a and b, the output shaft 6 performs reciprocating rotational movement in the directions of arrows c and d.

The amount of rotation of the output shaft due to the movement of the piston 5 is determined by the threaded portion 17.
．． 18 and the stroke of the piston 5. That is, when the stroke of the piston is constant, the amount of rotation becomes large when the lead size of the threaded portion 17, 18 is small, and the amount of rotation becomes small when the lead size is large. Further, when the stroke of the piston 5 is large, the amount of rotation becomes large, and when the stroke is small, the amount of rotation becomes small. Therefore, by adjusting the stroke of the piston 5, it is possible to change the amount of rotation of the output shaft 6.

In this embodiment, the abutting portion 3c of the regulating member 3 is configured to be retractable into the chamber 2a, and the stroke of the piston 5 can be adjusted by adjusting the protruding length of the abutting portion 3c with respect to the chamber 2a. It is configured as follows. That is, the rotating member 4
By rotating the regulating member 3 fitted into the member, it is possible to move the regulating member 3 in the directions of arrows a and b. Therefore, it is possible to set the protrusion length of the contact portion 3c with respect to the chamber 2a to a desired value.

As described above, when the abutment part 3c of the regulating member 3 is made to protrude into the chamber 2a by a desired length and the piston 5 is moved in the direction of the arrow, the contact surface 5a comes into contact with the abutment part 3c, causing the piston to move. 5 stops, and the stroke of the piston 5 is restricted. In this way, in the actuator A of this embodiment, the stroke of the piston 5 set at the design stage can be set to a desired value within the stroke range.

In this embodiment, the regulating member 3 is inserted into the rotating member 4, but
Naturally, in an actuator that does not have the rotating member 4, the stroke of the piston 5 can be regulated by directly inserting the regulating member 3 into the end portion 1a of the casing 1.

The actuator A of this embodiment is configured such that the rotation start point of the output shaft 6 (the position of the output shaft 6 relative to the casing 1 at the stroke limit of the piston 5) can be set at a desired position. . That is, in the actuator in the prior art, since the female threaded portion 51a that converts the movement of the piston member 55 into rotation is formed in the fixed casing 51, the rotation start point of the output shaft 54 is determined based on the casing 51. We have solved the problem that it is impossible to change the rotation starting point of the output shaft 54 because it is defined by the meshing position between the female threaded portion 51a and the male threaded portion 55b formed on the piston member 55. In the embodiment, a piston 5 is attached to a rotating member 4 configured to be rotatable and fixed to the casing 1.
This problem is solved by forming a spline 12 that defines the direction of movement.

That is, when the rotating member 4 is fixed to the casing 1 by the fastening members 9a and 9b, the spline 12 formed on the rotating member 4 is substantially integrated with the casing 1, so that the spline 12 formed on the piston 5 By meshing the spline 16 with the spline 12, it is possible to define the moving direction of the piston 5 and move the piston 5 linearly in the directions of arrows a and b.

Further, when the rotation member 4 is released from being fixed by the tightening members 9a and 9b, the rotation member 4 can be rotated as desired by the handle 13.

The rotation of the rotating member 4 is transmitted to the piston 5 via the spline 12.16, and further transmitted to the male threaded portion 18 formed on the output shaft 6 via the female threaded portion 17 formed on the piston 5, and is further transmitted to the male threaded portion 18 formed on the output shaft 6. 6 is rotated in accordance with the rotation of the rotating member 4. The output shaft 6 rotates independently from the casing 1. Therefore, by rotating the output shaft 6 to a desired position and fixing the rotating member 4 to the casing 1, it is possible to set a new rotation start point of the output shaft 6 with respect to the casing 1.

When the stroke limit of the piston 5 is changed by regulating the stroke limit of the piston 5 by the regulating member 3, the stroke limit of the piston 5 is changed.
Since the stop position of the output shaft 6 changes, the rotation start point of the output shaft 6 changes. Also in this case, by rotating the rotating member 4, it is possible to change the rotation starting point of the output shaft 6.

When rotating the rotating member 4 to rotate the output shaft 6, the piston 5 may move in the axial direction and the rotation of the rotating member 4 may not be transmitted to the output shaft 6. In this case, by rotating the rotating member 4 in the opposite direction, the piston 5 is urged toward the rotating member 4 side or the bearing member 7 side by the component force of the threaded portion 17.18, and the chamber 2 It is possible to transmit the rotation of the rotation member 4 to the output shaft 6 without changing the position of the piston 5 during the rotation.

In the RM embodiment, the regulating member 31 and the rotating member 4 can be applied independently to the actuator A, and the regulating member 3 and the rotating member 4 can be used together as in this embodiment. is possible.

Further, in the above-mentioned embodiment, the spline 1 is attached to the rotating member 4.
2 and a threaded portion 18 on the output shaft 6, a female threaded portion 17 is formed on the rotating member 4, a flag threaded portion 18 is formed on the outer periphery of the piston 5, and a threaded portion 18 is formed on the inner periphery of the piston 5. The spline 12 may be formed on the output shaft 6, and the spline 16 may be formed on the output shaft 6.

Further, in the above embodiment, the piston 5 is moved by the action of pressure oil, but it may be moved by, for example, pressurized air.

<Effects of the Invention> As described above in detail, the actuator according to the present invention meshes with the piston to rotate the piston in the actuator that converts the reciprocating movement of the piston into the reciprocating rotational movement of the output shaft. Since a rotating member is provided that drives the piston and defines the moving direction of the piston, and the rotating member is rotatably fixed to the casing, the piston can be rotationally driven by rotating the rotating member. By rotating the output shaft, it is possible to change the position of the rotation start point of the output shaft.

Other actuators convert reciprocating movement of a piston into reciprocating rotational movement of an output shaft.
Since a regulating member is provided that comes into contact with the piston to regulate the stroke limit of the piston, the amount of rotation of the output shaft can be controlled by regulating the stroke limit of the piston, that is, the movement range of the piston. The amount can be set according to the movement range of the piston.

Other actuators convert reciprocating movement of a piston into reciprocating rotational movement of an output shaft.
a rotating member that meshes with the piston to rotationally drive the piston and to define a moving direction of the piston;
Since a regulating member is provided that contacts the piston and regulates the stroke limit of the piston, and the rotating member is configured to be rotatable and fixed to the casing, the rotation start point of the output shaft can be set at a desired position. By regulating the stroke limit of the piston with the regulating member, the amount of rotation of the output shaft can be set to an amount corresponding to the movement range of the piston. .

[Brief explanation of drawings]

Fig. 1 is an explanatory cross-sectional view of the actuator, Fig. 2 is a view taken along the nn arrow in Fig. 1, Fig. 3 is an explanatory view of the rotating member and the regulating member, Fig. 4 is an explanatory view of the piston, and Fig. 5 is an explanatory view of the piston. The figure is an explanatory diagram of the bearing member and the closing member, and FIG. 6 is an explanatory diagram of the prior art. A is the actuator, ■ is the casing, ld is the slot,
2.2a, 2b are chambers, 3 is a regulating member, 3C is a contact portion, 4
is a rotating member, 4a is a shaft portion, 4b is a meshing portion, 5 is a piston, 5a is a contact surface, 5b is a piston portion, 6 is an output shaft, 6a
is a flange, 6b is an output part, 7 is a bearing member, 8 is a closing member, 9a, 9b are tightening members, 1O is an opening, 12.16 is a spline, 13 is a handle, 17 is a female thread, 18 is a male thread Part 19 is an O-ring.

Claims (3)

[Claims] (1) In a rotary actuator configured to house a piston and an output shaft meshing with the piston in a chamber formed inside a casing, and convert the reciprocating movement of the piston into interlocking reciprocating rotation of the output shaft, A rotary member is provided in the chamber to mesh with the piston to rotationally drive the piston and to define a moving direction of the piston, and the rotary member is configured to be rotatable and fixed to the casing. A rotary actuator featuring (2) In a rotary actuator configured to house a piston and an output shaft meshing with the piston in a chamber formed inside a casing, and convert the reciprocating movement of the piston into reciprocating rotational movement of the output shaft, A rotary actuator characterized in that a regulating member for regulating a stroke limit of the piston by contacting the piston is provided in the chamber. (3) In a rotary actuator configured to house a piston and an output shaft meshing with the piston in a chamber formed inside a casing, and convert the reciprocating movement of the piston into reciprocating rotational movement of the output shaft, a rotating member that meshes with the piston in the chamber to rotationally drive the piston and to define the moving direction of the piston; and a regulating member that comes into contact with the piston to restrict the stroke limit of the piston. A rotary actuator characterized in that the rotating member is configured to be rotatable and fixed relative to a casing.