JPS5832006Y2 - fluid pressure cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid pressure cylinder such as an air cylinder or a hydraulic cylinder.

In various devices that use a fluid pressure cylinder as a driving source,
A guide sliding part is provided separately to guide the direction of movement of the object.
Normally, a fluid pressure cylinder only drives an object that slides while being guided by a guide part, and since the piston rod of the fluid pressure cylinder rotates during reciprocating motion, it is not possible to attach the rod end directly to the object. could not.

The object of the invention is to provide a hydraulic cylinder whose rod end can be attached directly to an object without the need for additional guide parts.

An air cylinder according to an embodiment of the present invention will be explained below with reference to the drawings.

A piston 3 is slidably disposed within a cylinder hole 2 provided in a cylinder tube 1.

A rod side block 4 and an end side block 5 are fixed to both ends of the cylinder tube 1 by stay bolts 6 and nuts 7, and both ends of the cylinder "JL2" are closed.

Air connection ports 8 and 9 are provided in the rod side block 4 and the end side block 5, respectively, and the air connection ports 8 and 9 communicate with air inlet/outlet chambers 10.11 provided in the blocks 4 and 5.

Two piston rods 12 and 13 are connected to the piston 3 in parallel by a fixing nut 14.

The two piston rods 12 and 13 pass through the seat plate 15, the rod guide 16 and the backing plate 17, and pass through the cylinder "JL".
A rod end fitting 18 is fixed to the rod end thereof by a nut 19.

The rod guide 16 slidably guides the piston rods 12 and 13, and has an oil passage 20 for lubrication.

Lubricating oil is supplied to the oil passage 20 by an oil reservoir 21 .

The length of the rod guide 16 is determined to be considerably larger than the length of the sliding surface of the piston 3 with the cylinder "JL2."

The air chambers 22.23 formed before and after the piston 3 communicate with the air inlet/outlet chamber 10.11, between which cushion seals 24, 25 are provided.

The cushion seals 24, 25 come into close contact with cushion collar portions 26.27 provided at both ends of the piston 3 and interrupt communication between the air chamber 22.23 and the air inlet/outlet chamber 10.11.

On the other hand, the air chamber 22.23 also has a narrow bypass 28.2.
9 and a cushion adjustment needle valve 30.31 to an air inlet/outlet chamber 10.11.

When the air connection port 8 is opened to the atmosphere and air is supplied from the air connection port 9, the air pressure in the air chamber 23 becomes higher than the air pressure in the air chamber 22, so the difference in air pressure causes the piston 3 to move to the right in the drawing. Advance.

As the piston 3 moves forward, the piston rods 12 and 13 also move forward while being guided by the rod guide 16.

When the cushion collar portion 26 comes into close contact with the cushion seal 24, the air in the air chamber 22 can only flow into the air inlet/outlet chamber 10 through the flow path with high flow resistance via the bypass 28 and the cushion adjustment needle valve 30. The air pressure in the air chamber 22 becomes high, the piston 3 is decelerated, and the piston 3 hits the rod-side block 4 and comes to a quiet stop.

When the air is switched, the air connection port 9 is opened to the atmosphere, and air is supplied from the air connection port 8, the piston 3 retreats.

If an object is directly attached to the rod end fitting 18, the object will reciprocate due to the reciprocating movement of the piston 3.

Since the piston rods 12 and 13 are guided by a rod guide 16 provided in the rod-side block 4, even if the object is directly attached to the rod end fitting 18, the object can be reciprocated in the exact cylinder axis direction. be able to.

Furthermore, since there are two piston rods 12 and 13, the piston 3 and the piston rods 12 and 13 do not rotate, so the object can also reciprocate without rotating.

Therefore, the present invention can be widely used in applications such as driving the arms of industrial robots.

The fluid pressure cylinder of the present invention has two piston rods connected in parallel to a piston that is slidably disposed in a cylinder hole, and the inside of one end of the cylinder on the side where the piston rod protrudes outside the cylinder. The present invention is characterized in that a rod guide is provided to guide the piston rod in the cylinder axial direction, so there is no need to provide any other guide portion, and the rod end can be directly attached to an object.

Another feature is that the length of the rod guide is larger than the length of the sliding surface of the piston, so that the force perpendicular to the axial direction applied to the piston rod is received by the rod guide and transferred to the piston. The application of that force can be prevented, thereby reducing wear on the piston seals.

[Brief explanation of the drawing]

The drawing is a sectional view of an embodiment of the present invention. 2... One hole in the cylinder, 3... Piston, 12, 13... Piston rod, 16...
...Rod guide.

Claims (1)

[Scope of utility model registration request] Two piston rods are connected in parallel to a piston that is slidably disposed in a cylinder hole, and the piston rods are connected in the cylinder axial direction inside one end of the cylinder on the side where the piston rod protrudes outside the cylinder. A fluid pressure cylinder characterized in that a rod guide is provided to guide the piston, and the length of the rod guide is larger than the length of the sliding surface of the piston.