JP2537176Y2 - Rack and pinion type swing actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rack-and-pinion type rocking actuator, and more specifically, stops a shaft at an arbitrary position in the middle of a rotary rocking stroke. The present invention relates to a rack and pinion type swing actuator.

[Prior Art] When various operations are performed using a shaft of a rocking actuator, a rocking actuator capable of stopping a shaft at an arbitrary intermediate position of a rotary rocking stroke is required to improve workability. ing.

Conventionally, in order to stop the shaft of a rack and pinion type rocking actuator at an intermediate position of a rotary rocking stroke, a rack and pinion type rocking actuator in which a positioning cylinder is attached to a cylinder of the above actuator is disclosed in Japanese Patent Application Laid-Open No. 63-19408. It is proposed in the gazette.

However, the known rack and pinion type swing actuator adjusts the intermediate stop position of the piston,
The buffer cannot be stopped at the adjusted intermediate stop position.

[Problem to be Solved by the Invention] A problem to be solved by the present invention is to provide a rack and pinion type rocking actuator in which a shaft can be buffered and stopped at an arbitrary intermediate position of a rotation rocking stroke.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a cylinder having a piston with a rack cut out, and a shaft having a pinion meshing with the rack, and the piston is linearly moved by fluid pressure. In a rack and pinion type oscillating actuator that converts reciprocating motion into rotational oscillating motion of a shaft, a rod that is driven in a sliding direction of the piston by fluid pressure to stop the piston at a sliding intermediate position is provided on one side of the cylinder. With the positioning cylinder having
The rod is provided with a shock absorber for stopping the piston in a buffered manner.

[Operation] When the piston is driven in a state where the rod of the positioning cylinder is advanced by the pressure fluid, the piston comes into contact with the rod and stops at that position. When the pressure fluid of the positioning cylinder is discharged, the piston and the rod continue in the same direction. Drive.

Therefore, the shaft can be stopped at the intermediate position of the rotation swing stroke.

In this case, if the positioning cylinder is moved forward and backward in the same direction as the sliding direction of the piston, the tip end position of the rod of the positioning cylinder moves forward and backward with respect to the cylinder of the rack and pinion type swing actuator. Position can be adjusted.

Also, since the shock absorber is installed inside the rod of the positioning cylinder, even if the tip position of the rod advances or retreats by adjusting the intermediate stop position, regardless of the tip position of the rod, the piston and the shaft that rotates and swings by this are It can be buffered at any intermediate position.

[Embodiment] The drawings show an embodiment of the present invention. This rack and pinion type oscillating actuator comprises a body 1, a pair of cylinders 2a and 2b formed parallel to the body 1, and both ends of these cylinders are closed. It includes plates 3a and 3b and a positioning cylinder 4 to be described later assembled to the plate 3b.

Pistons 6a, 6b reciprocating in the cylinders 2a, 2b have racks 7a, 7b on opposing peripheral surfaces, and a pinion 9 meshing with the racks 7a, 7b is integrally rotatable with a shaft 8 passing through the body 1. A pressure fluid supply / discharge port (not shown) is opened in the pressure chambers 10a and 10b partitioned by the piston 6a, and a shock absorber 11 projecting into the cylinder 2b is attached to the plate 3a. I have.

The positioning cylinder 4 is provided with a piston on the plate 3b.
6b, a cylinder body 13 screwed forward and backward in the same direction as the sliding direction, an end plate 14 for closing the opening thereof, a positioning piston 15 sliding airtightly in the cylinder body, and an end plate 14 passing therethrough. And a rod 16 of a positioning cylinder projecting into the cylinder 2b, and a shock absorber 17 projecting into the cylinder 6b is incorporated into the rod 16 arranged concentrically with the piston 6b.

The positioning piston 15 is formed to have a larger diameter than the pistons 6a and 6b, and a port 19 of a plug 20 screwed to the cylinder body 13 is opened in a pressure chamber 18 defined by the piston 15. Reference numeral 22 in the drawing denotes a plug whose port for supplying oil to the shock absorber 17 is closed.

In the above embodiment, when compressed air is supplied to the pressure chamber 10b in a state where the pressure chamber 18 is opened to the outside, the driving side piston 6a moves rightward in the drawing, and the pinion 9 and the shaft 8 rotate counterclockwise, As a result, the driven-side piston 6b moves leftward in the drawing, and the positioning piston 15 is bufferedly stopped by the shock absorber 17 at the end of the leftward stroke where the plug 20 contacts the plug 20 (see FIG. 1).
When the compressed air is supplied to a, the pistons 6a and 6b and the pinion 9 and the shaft 8 are driven in opposite directions, and the piston 6b is stopped in a shock absorbing manner by the shock absorber 11 at the stroke end position.

When compressed air is supplied from the port 19 to the pressure chamber 18, the positioning piston 15 moves to the right in the drawing. When compressed air is supplied to the pressure chamber 10b in this state, the driven-side piston 6b, which moves to the left in the drawing, is bufferedly stopped by the shock absorber 17 provided at the position where it abuts on the rod 16 (see FIG. 2). ), The shaft 8 stops at the intermediate position of the rotation swing stroke. In this case, since the positioning piston 15 has a larger diameter than the pistons 6a and 6b, the positioning piston 15 does not slide due to the fluid pressure of the pressure chamber 10b.

When the compressed air in the pressure chamber 18 is discharged to the outside, the piston 6
The strokes a and 6b continue to slide in the same direction, and the positioning piston 15 abuts on the plug 20 to complete the stroke. In this case, since the pistons 6a and 6b are meter-out controlled by the port 19, they are not driven at a rapid speed.

Further, by moving the cylinder body 13 forward and backward with respect to the plate 3b and fixing the position with the nut 21, the piston
6a, 6b, in other words, the intermediate stop position of the shaft 8 can be adjusted.

Although not shown, if a positioning cylinder is also provided on the plate 3a, the shaft 8 can be stopped at an intermediate position in both directions of the rotational swing.

[Effect of the Invention] The rack and pinion type swing actuator of the present invention can stop the piston and the shaft at an arbitrary position in the rotation swing stroke by moving the positioning cylinder forward and backward.

Further, since the shock absorber is provided inside the rod of the positioning cylinder, even if the intermediate stop positions of the piston and the shaft are adjusted by moving the positioning cylinder forward and backward, the shock absorber can be stopped at the adjusted intermediate stop position.

Furthermore, since a separate space for mounting the shock absorber is not required, the provision of the shock absorber can prevent the actuator from becoming large.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a state of the intermediate stop. 2a, 2b …… Cylinder, 4 …… Positioning cylinder, 6a, 6b…
... Piston, 7a, 7b ... Rack, 8 ... Shaft, 9 ...
... Pinion, 16 ... Rod, 17 ... Shock absorber.

Claims (1)

(57) [Scope of request for utility model registration] 1. A rack and pinion type oscillating device comprising: a cylinder having a piston having a rack cut therein; and a shaft having a pinion meshing with the rack, wherein a linear reciprocating motion of the piston by fluid pressure is converted into a rotational oscillating motion of the shaft. In the dynamic actuator, a positioning cylinder having a rod that is driven in a sliding direction of the piston by fluid pressure to stop the piston at a sliding intermediate position is attached to one side of the cylinder so as to be able to advance and retreat, and the rod is attached to the rod. A rack and pinion type swing actuator, wherein a shock absorber for stopping the piston in a buffered manner is provided.