JPS5847289Y2 - actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuator actuated by fluid pressure within a bellows tube.

Conventionally, a hydraulic cylinder has been used as a typical actuator, but this hydraulic cylinder generally moves a piston inserted within the cylinder back and forth along the cylinder, and the length is approximately twice the stroke length. Because it takes up so much space, it cannot be installed in a narrow space, and it is limited to linear movement.

The present invention provides an actuator that has a large stroke ratio with respect to the total length of the device and can move in an arcuate direction.A bellows tube is provided around the outer periphery of a linear or arcuate guide rod to cover it. One end of the bellows tube is liquid-tightly fixed to one end of the guide rod, and the other end is liquid-tightly fixed to a movable body that allows the bellows tube to slide along the guide rod, allowing fluid to flow into the bellows tube. Expanding and contracting the bellows tube by supplying or discharging it,
This allows the movable body to reciprocate along the guide rod.

Hereinafter, practical examples of the present invention will be explained with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, in which a guide rod 1 has its upper end caulked to a bracket 2 and is fixed to a fixed body via the bracket 2, and its lower end is secured by a bolt part 11. It is also fixed to a fixed body.

A movable body 3 connected to an actuating portion (not shown) is fitted onto the guide rod 1, and the movable body 3 reciprocates along the guide rod 1 between upper and lower stopper portions 12 and 13. It is considered possible.

40 is an O-ring for keeping the sliding portion of the movable body 3 and the guide rod 1 liquid-tight.

A bellows tube 5 made of synthetic resin, rubber, etc., which has bending resistance and excellent mechanical strength, is provided on the outer periphery of the guide rod 1 so as to cover the rod 1, and its upper end is connected to the outer periphery of the cylindrical part of the movable body 30. It is fixed to by an annular presser foot 60.

The lower end of the bellows tube 5 is fixed to the outer periphery of the lower end of the guide rod 1 by an annular presser foot 61.

41 and 42 are O-rings for sealing the upper and lower end fixing portions of the bellows 5.

A passage 14 is provided at the lower end of the guide rod 1 to communicate the sealed space 7 formed between the guide rod 1 in the bellows tube 5 and the outside.

To operate this actuator, if a working fluid such as oil or air is supplied to the space 1 from the passage 14, the movable body 3 will be pushed up by the fluid pressure and the bellows tube 5 will extend.

Further, when the working fluid in the space 7 is removed from the passage 14, the movable body 3 is lowered and the bellows tube 5 is contracted.

In this way, the movable body 3 moves along the guide rod 1 between its stop portions 12, 13.

FIG. 2 shows an embodiment in which the present invention is applied to a double-acting actuator.

The guide rod 1 consists of an upper support part las, a movable body guide part 1b, and a lower support part 1c.

The movable body 1 is slidably fitted into the cylindrical guide portion 1b,
Its upper and lower ends are screwed to opposing ends 11a and 11c of upper support 1a and lower support 1c, respectively.

The reciprocating motion of the movable body 1 is caused by the guide portion 1b and the upper and lower supports? a,
It is regulated by stoppers 15 and 16 formed at the joint with lc.

A bellows tube 5a is provided around the upper support 1a, the upper end of the tube 5a is fixed to the outer periphery of the upper end of the support 1a with a presser foot 62, and one end is attached to the outer periphery of the cylindrical portion of the movable body 10 with a presser foot 63. A sealed space 71 is formed between the upper support 1a and the bellows tube 5a.

Further, a bellows tube 5b is provided around the lower support 1C, the upper end of the tube 5b is fixed to the outer periphery of the cylindrical part of the movable body 3 with a presser foot 64, and the lower end is outside the lower part of the lower support 1C. is fixed to the lower support IC with a presser foot 65, and a sealed space 72 is formed between the lower support IC and the bellows tube 5b.

The fixed portions at both ends of the tubes 5a and 5b are made liquid-tight by OI rings.

A passage 141 is provided at one of the lower ends of the lower support 1c to communicate the space T2 inside the bellows tube 5b with the outside.

In addition, a passage 142 is opened at the other lower end, and the passage 142 extends to the axial center of the lower support 1c, and further passes from the inner hole of the guide part 1b to the center of the end of the upper support 1a. It communicates with the space 71 inside the bellows tube 5a.

The actuator is fixed to the fixed body by a bracket 2 caulked to the upper end of the upper support part 1a and a bolt part 11 formed at the lower end of the lower support part 1c.

Therefore, in this actuator, by controlling the supply of fluid pressure to raise the movable body 3 from the passage 141 and fluid pressure to lower the movable body 3 from the passage 142, the movable body 3 is forced to move between the stoppers 15 and 16. This allows a desired stroke of reciprocating movement along the guide portion 1b.

All of the above are examples in which the movable body is caused to make linear reciprocating motion, but if the entire guide rod or the movable body guide portion of the guide rod is formed in an arc shape, the movable body can be made to make a circular reciprocating motion. It is possible to do so.

As described above, the actuator of the present invention is equipped with a movable body that reciprocates along the guide rod, and a bellows tube that surrounds the guide rod and has both ends fixed to the movable body and the outer periphery of the guide rod in a fluid-tight manner. A sealed space is formed in the bellows chi-tube, and fluid pressure supplied to the space is applied to the movable body to cause the movable body to reciprocate along the guide rod.

Therefore, the actuator of the present invention does not change its overall length even during operation, and the stroke ratio to the overall length can be made larger than that of conventional hydraulic cylinders.

Furthermore, by configuring the movable body to move along the guide rod, if the shape of the guide rod is made arcuate, the direction of movement of the movable body can be made arcuate.
This significantly expands the applications of this type of actuator.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a second actual case. 1... Guide rod, 3... Movable body, 5
, 5a. 5b... Bellows tube, 14, 141, 142
・・・－・・・Fluid passage.

Claims (1)

[Scope of utility model registration request] A bellows tube is provided to cover the guide rod, one end of the bellows tube is liquid-tightly fixed to one end of the guide rod, and the other end is liquid-tightly fixed to a movable body slidably provided along the guide rod, An actuator characterized in that a fluid is supplied or discharged into a bellows tube, thereby causing the bellows tube to expand and contract, thereby causing a movable body to reciprocate along a guide rod.