JPH1182424A - Cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic or pneumatic cylinder having an ability to withstand a very heavy load or weight which was difficult before. SOLUTION: A cylinder is provided with a main body 10 in which a piston having a pressure side and a rod side is incorporated and an operating rod 20 which is provided with a follower end 21 at its end part and operated by a hydraulic or pneumatic pressure for the rod to be driven inside the main body. The follower end is provided with a pressure resistant piece 22 and a leakage preventing ring 23 in which an air gap 24 is formed between the follower end and pressure resistant piece. Also the main body comprises an outlet end 11 with the pressure resistant piece 22, an outlet cap 12, and the leakage preventing ring 23 provided between an outlet end pressure resistant piece and the outlet cap. In addition, the operating rod is structured so that, before a pressing force is transmitted to act on the leakage preventing ring, it brings a pressing force to act on at least one pressure resistant piece so that it can be moved in longitudinal direction. Thus the leakage preventing ring 23 acts a repulsion on the inside wall surface of the main body so as to compress it between the follower end and pressure resistant piece.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hydraulic or pneumatic cylinder, and more particularly to a strong hydraulic or pneumatic cylinder capable of withstanding heavy loads or weights.

[0002]

BACKGROUND OF THE INVENTION A conventional hydraulic or pneumatic cylinder, as shown in FIG. 1, has an actuating body 10 having two fluid or air holes 11 and an end 21 having a plurality of leak-proof rings 22. Consisting of a rod 20 whose body has its outlet end 1
At 2 there is provided a plurality of leak-proof rings 22 ', said actuation rod being actuated by liquid or air injected at its end.

However, the conventional cylinder has the disadvantage that the end portion 21 of the operating rod cannot withstand heavy load or weight, and the leakage prevention ring 22 is worn.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a powerful hydraulic or pneumatic cylinder comprising a body with an actuating rod having an internally driven end, which can obviate said disadvantages. Is to do.

It is a further object of the present invention to provide a strong hydraulic or pneumatic cylinder having an elastic piece disposed between the driven end of the operating rod and the pressure piece.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a body having a piston having a pressure side and a rod side therein, and a liquid or pneumatically driven end within the body having a driven end. A driven end having at least one pressure-resistant piece, a leakage prevention ring having a gap formed between the driven end and the pressure-resistant piece, and a pressure-resistant piece fixed to the operating rod. Fixed by a piece,
The main body includes an outlet end provided with at least one pressure-resistant piece, an outlet cap, and a leakage prevention ring interposed between the outlet-end pressure-resistant piece and the outlet cap.
Before the pressing force is transmitted to act on the at least one leak-prevention ring, a pressure force is applied to act on the at least one pressure-resistant piece so that it can be operated back and forth; In order to apply a repulsive force to the inner wall surface of the main body, the driven member is compressed between the driven end and the pressure-resistant piece.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The driven end is actuated hydraulically or pneumatically to activate its operating rod.
The driven end is provided with a pressure-resistant piece on a side portion, and the driven end and the pressure-resistant piece are provided with a leakage prevention ring therebetween, and a gap is formed between the driven end and the pressure-resistant piece by the leakage prevention ring.

The main body has at least one pressure-resistant piece at the outlet portion, and the outlet cap and the pressure-resistant piece have a leakage prevention ring therebetween.

When the operating rod acts to generate pressure, the pressure-resistant piece acts by that pressure, which is then applied to the inner wall of the body in order so that the cylinder can withstand heavy loads or weights. It acts on the leak prevention ring which generates the acting repulsive force.

The elastic piece is intended to promote the efficiency of the pressure piece when the cylinder is under high pressure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The powerful hydraulic or pneumatic cylinder of the present invention comprises a main body 10 in which an operating rod 20 having a driven end 21 at one end is installed.

The driven end 21 is driven hydraulically or pneumatically to move the operating rod 20 back and forth.

The driven end 21 has one or more pressure-resistant pieces 22 on both left and right sides thereof.

A leakage prevention ring 23 is provided at an outer peripheral portion between the driven end 21 and the pressure-resistant piece 22, and a gap 24 is formed between the driven end 21 and the pressure-resistant piece 22 by the leakage prevention ring.

The pressure-resistant piece 22 is fixed by a holding piece 25.

The main body 10 has at its outlet end 11 at least one pressure-resistant piece 22, an outlet cap 12, and a leakage prevention ring 23 interposed between the pressure-resistant piece 22 and the outlet cap 12.

The operating rod 20 is moved back and forth within the main body 10 so that a pressing force is generated by liquid pressure or air pressure.

The pressure piece 22 is actuated by the pressing force transmitted to the leak prevention ring 23 in sequence.

The leak prevention ring 23 is provided at the driven end 2.
1 and the pressure-resistant piece 22 are compressed.
Inner wall 13 is affected by the repulsive force of the leakage prevention ring 23. As a result, the actuation rod 20 can withstand heavier loads or weights.

As shown in FIG. 3, the elastic piece 26 is disposed between the driven end 21 of the operating rod 20 and the pressure-resistant piece 22.

When the pressure piece 22 is acted upon by the pressure, the elastic piece 26 acts before the leakage prevention ring 23 is pressed by the pressure piece 22.

As a result, the actuation rod 20 is more effective while the pressure piece 22 is better installed to cope with larger loads or weights.

As shown in FIGS. 4 to 7, the leak preventing ring 23 has a variety of cross-sectional shapes such as a circle, a square, a wedge, a rectangle, and a triangle. When pressed, it expands. As a result, the leakage prevention ring 23 has an excellent leakage prevention effect.

As shown in FIG. 8, the elastic piece 26 is disposed in contact with the outside of the leak preventing ring 23. When the elastic piece is deformed by hydraulic pressure or pneumatic pressure, the leak preventing ring 23 becomes dominant. It is pressed by the deformed elastic piece 26 so as to bring about the effect of preventing leakage.

The embodiments of the present invention described above are illustrative in all parts, and the present invention can be embodied in other forms without departing from the spirit thereof.

[0026]

Since the present invention has the above-described structure,
In particular, the cylinder can sufficiently withstand heavy loads or weights.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a conventional cylinder.

FIG. 2 is a front sectional view of the cylinder of the present invention.

FIG. 3 is a front sectional view of a cylinder according to another example of the present invention.

FIG. 4 is a front sectional view of the leakage prevention ring portion during operation.

FIG. 5 is a front sectional view of another example of the leakage prevention ring portion during operation.

FIG. 6 is a front sectional view of another example of the leakage prevention ring portion during operation.

FIG. 7 is a front sectional view of still another example of the leakage prevention ring portion during operation.

FIG. 8 is a front sectional view of another example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main body 20 Operating rod 21 Followed end 22 Pressure-resistant piece 23 Leak prevention ring 24 Void 25 Holding piece 26 Elastic piece

Claims (4)

[Claims] 1. A cylinder comprising a main body having a piston having a pressure side and a rod side therein, and a hydraulic or pneumatically actuated rod having a driven end at an end for driving in the main body. The driven end has at least one pressure-resistant piece, has a leakage prevention ring in which a gap is formed between the driven end and the pressure-resistant piece, the pressure-resistant piece is fixed by a holding piece fixed to the operating rod, and the main body is An outlet end provided with at least one pressure-resistant piece, an outlet cap, and a leakage prevention ring interposed between the outlet-end pressure-resistant piece and the outlet cap; A pressure force is applied to act on at least one pressure piece before being transmitted to act on the anti-leak ring so that it can be operated back and forth, wherein at least one of said anti-leak rings repels A cylinder characterized in that the cylinder is compressed between a driven end and a pressure-resistant piece to apply a force to an inner wall surface of the main body. 2. The cylinder according to claim 1, wherein an elastic piece is provided between the driven end of the operating rod and the pressure-resistant piece. 3. The cylinder according to claim 1, wherein the leak-proof ring has an arbitrary cross-section and expands when acted on by the pressure-resistant piece. 4. The cylinder according to claim 1, wherein at least one of the leakage prevention rings comprises an elastic piece deformed by liquid pressure or air pressure pressing the leakage prevention rings.