JPS5824606A - Hydraulic cylinder using expansion bellows - Google Patents

Abstract

PURPOSE:To provide a hydraulic cylinder which can prevent leakage of a fluid and be simplified in structure by coupling a piston to a head cover with an expansion bellows to be kept airtight. CONSTITUTION:A hydraulic cylinder comprises a connecting rod 4 for coupling head covers 1, 1' to each other, and a piston rod 2 provided with a piston 3 fixed to the end thereof through a stopper 8, which slidably runs through the central portion of one head cover 1. An expansion bellows 5 is disposed to keep airtight between the piston 3 and the head cover 1, and one end portion of the head cover 1 is provided with a hole portion 6 for feeding and discharging a fluid. By the pressure of fluid fed and supplied through the hole portion 6, the piston 3, that is, the piston rod 2 is retreated and advanced through the bellows 5. Thus, the hydraulic cylinder can be simplified in structure, and decrease in cost.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in pneumatically or hydraulically driven cylinders.

Among the cylinders commonly used in the past, an air cylinder, for example, has a basic structure of a piston and piston, which is slidably fitted into a cylinder tube, and compressed air is supplied from one end of the sealed cylinder tube. In order to provide inflow and outflow ports and to increase the airtightness between the piston and the cylinder, it has a structure in which a honing member, a 09y gong, etc. are fitted and held. Furthermore, in order to improve the lubrication characteristics of the finger parts, it is possible to inject lubricating oil or use oil-impregnated parts, etc., and various other gaskets and nuts are required to prevent fluid leakage, which inevitably results in a complicated structure. This is one of the reasons for the increase in costs.

The present invention has been devised in response to the above-mentioned reality, and aims to eliminate the above-mentioned conventional drawbacks and realize a more improved cylinder. It is equipped with a piston rod, a retractable bellows installed to seal between the piston, the scissors piston, and the head cover, and a fluid supply/discharge hole provided in the lever at one end of the head cover. The present invention aims to provide a fluid pressure cylinder using a telescopic bellows and an improved device thereof. FIG. 1 is a partially broken sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view of the same. Since the above figures clearly show only the essential parts of the invention, illustrations of accessories and the like are omitted.

1.1' is a herad cover into which the piston rod 2 is inserted from the center, and the piston 3 is fixed to one end of the piston rod 2.

Reference numeral 4.4 is a support rod that connects the helad cover 1.1', and is configured to serve as a guide when the piston 3 moves from side to side. Further, a retractable bellows 5 is provided to seal the space between the piston 3 and the head cover 1 of the cylinder, and a hole 6 for supplying and discharging fluid such as air is provided at one end of the head cover 1.

Reference numerals 7 and 7 are screw holes provided at the circumferential end of the cover 1, which are used when fixing the cover to other equipment. If a rubber tube or the like is arranged in the supply/discharge hole 6 to supply and discharge compressed air controlled by a solenoid valve (not shown), the bellows 5 will expand due to the air pressure, and the piston 3 will move from side to side. The bellows 5 has a bellows shape as shown, and can be freely expanded and contracted depending on the level of air pressure.

8 is a stopper that comes into contact with the head cover 1 when the bellows 5 expands and contracts. FIG. 3 shows another embodiment of the present invention, the basic configuration of which is the same as that of FIG. 1, except that the piston 30
Piston rods 2 and 2 are provided on both sides for multi-purpose use. Furthermore, in the embodiment shown in FIG. 4, a retractable pan 5' similar to the bellows 5 is attached to the piston 30.
The piston 3 can be driven at a higher speed by controlling the supply and outflow of air to and from the fluid supply/discharge hole 6°C'. FIG. 5 shows still another embodiment of the present invention, in which the pair a and c5 described above are interposed on one side of the piston 30, and a spring 9 is interposed on the other side of the piston 3. q is a stopper when the piston 3 comes into contact with it.

According to this example, when extending the bellows 5, if air is supplied from the fluid supply/discharge hole 6, the piston 3 moves to the right while compressing the spring 9, while air is supplied. When the piston 3 is stopped and the supply/discharge hole 6 is opened free 1/(, the piston 3 is moved to the left by the elastic repulsive force of the spring 90.

The bellows 5 and the bellows are constructed in a bellows-like expandable shape, and the material thereof is suitably a thin metal plate such as phosphor bronze.
Rubber members or other materials may be used.As explained in detail above, the present invention realizes a cylinder using a bellows that is driven to expand and contract by air pressure or hydraulic pressure, and has the following practical advantages. In other words, by eliminating the cylinder tube, which is essential to conventional cylinders, and adopting a telescopic bellows, it is possible to greatly simplify the mechanism and reduce costs.In other words, the cylinder tube can be completely abolished. This makes it possible to omit all special sliding members, O-rings, and other attached parts for maintaining airtightness.The overall structure of the device is simple, making it easy to manufacture and facilitating mass production. In addition, since the response speed of the bellows 5 based on the supply and discharge of fluid pressure is high, it has the advantage of being able to speed up the driving process, and it has the advantage of being able to speed up the drive process, compared to the atmospheric pressure and pressure used in conventional various fields. Since it can be used in place of a hydraulic cylinder, it realizes a fluid pressure cylinder with great practical value.

[Brief explanation of the drawing]

FIG. 1 is a partially broken sectional view showing an embodiment of the present invention;
FIG. 2 is a perspective view of the same, and FIGS. 3, 4, and 5 are views of other embodiments of the present invention. 1.1'... Head cover, 2... Piston rod, 3... Piston, 4... Support rod, 5. ff...
Bellows, 6... Supply/discharge hole, 7... Screw hole, 8...
...Stopper, 9...Spring, 6-

Claims (3)

[Claims] (1) A piston rod 2 and a piston 3 inserted from one end of the herad cover, and a retractable bellows 5 attached to seal the space between the piston 3 and the herad cover 1;
A fluid pressure cylinder using a telescopic pair, which is patented as having a fluid supply/discharge hole 6 provided at one end of the head cover 1. (2) A fluid pressure cylinder using a telescopic bellows according to claim 1, in which telescopic bellows 5 are provided on both sides of the piston 3. (3) A fluid pressure cylinder using a telescopic bellows according to claim (1), in which a telescopic bellows 5 is provided on one side of a piston 30.