JPH06123305A - Rodless cylinder - Google Patents

Abstract

PURPOSE:To enlarge the stroke ratio in relative to the inner diameter of a cylinder, and use the high pressure fluid efficiently by building a piston, which can slide freely, inside of a hose, and pressing the outside of the hose with pinch rollers of a carriage. CONSTITUTION:A piston 2, which can slide freely, is built in a hose 1, and the outside of the hose 1 is pressed by pinch rollers 4a, 4b, which are fitted to shafts 5a, 5b of a carriage 3 freely to turn. The carriage 3 travels on a frame 8 with guide rollers 6, which are fitted to a shaft 7 freely to turn at four corners of the carriage 3. Rollers 2a, 2b on the piston 2 are fitted to shafts 2c, 2d freely to turn. In shoes 2f and 2g, a material having a low coefficient of friction is used for the contact surface with the hole 1, and an O ring 2e is installed to the piston 2. The stroke ratio in relative to the cylinder diameter can be thereby enlarged remarkably.

Description

Description: [0001] The present invention relates to a structure of a hydropneumatic rodless cylinder.

[0002] [Prior Art] Conventionally commercially available rodless cylinders have many leaks and are practically difficult to use for high pressure hydraulic pressure. In the case of high pressure, they are composed of a rigid cylinder, piston and rod. A general hydraulic cylinder is used. Also, with the pinch roller type, leakage cannot be avoided and accurate operation is difficult.

[0003] [Problems to be Solved by the Invention] In a conventional pneumatic hydraulic cylinder, the ratio of the stroke of the piston to the inner diameter of the cylinder is limited by the buckling strength of the rod. In addition, there is an example (Japanese Patent Publication No. 42-25016) in which a device in which a pipe body (hereinafter, hose) made of a material such as rubber is pressed by a pinch roller and driven by a low pressure fluid in the hose is disclosed. In the case of high pressure fluid, the strength of the hose becomes large, so it is difficult to completely pinch the hose with a pinch roller, and the pressure fluid leaks.

[0004] It is an object of the present invention to provide a rodless cylinder capable of greatly increasing the ratio of the stroke to the cylinder inner diameter over the conventional value and using a high pressure fluid with high efficiency. There is.

[0005] [Means for Solving the Problems] In order to achieve the above object, in the rodless cylinder of the present invention, a hose made of a material having elasticity (not only non-metal but also metal) may be used. It has a structure in which a slidable piston is built in, the outside is held by a pinch roller of the carriage, and the movement of the piston moved by the pressure fluid is transmitted to the carriage.

[0006] In order to prevent leakage of the outer circumference of the piston, O
Rings are preferred.

[0007] A piston structure having a roller or a shoe for transmitting a piston force due to fluid pressure to a pinch roller.

[0008] [Operation] In the rodless cylinder configured as described above, the movement of the piston due to the pressure fluid can be transmitted to the outer pinch roller via the hose by the roller or shoe on the piston to drive the carriage. it can.

[0009] Even when used with high-pressure fluid, the O-ring provided on the piston can press the inner wall of the hose and respond to expansion of the hose.

[0010] [Example] An example will be described. Figure 1
2 and FIG. 2, the hose 1 has a slidable piston 2
And a shaft 5a and 5b of the carriage 3 on the outside thereof.
The rollable pinch rollers 4a and 4b pivotally attached to each other press. Then, the carriage 3 is attached to the frame 8 by the rolling guide rollers 6 pivotally attached to the shafts 7 at its four corners.
Drive over If there are structures (rails, concrete roadbeds, etc.) on the ground that can replace the frame 8,
The frame 8 can be omitted.

[0011] In FIG. 3, the roller 2 on the piston 2
The shafts a and 2b are rotatably supported by shafts 2c and 2d. The shoe 1 is attached to the shoes 2f and 2g.
A low friction coefficient material (PTFE etc.) is used for the contact surface with
An O-ring 2e is attached to the piston.

[0012] In FIG. 4, rollers 12a and 12b on piston 12 are rotatably pivoted by shafts 12c and 12d. The O-ring 12e is mounted on the piston 12 and appropriately pressed against the inner wall of the hose 1 by the fluid pressure of the pressure chamber 12f.

[0013] [Effect of the Invention] Since the present invention is configured as described above, the following effects can be obtained.

[0014] In a hydraulic / pneumatic cylinder with a relatively high fluid pressure, the ratio of the stroke to the cylinder diameter can be made to be much larger than the conventional value.

[0015] Leakage around the piston can be prevented, and the piston force due to the fluid pressure is transmitted to the pinch roller by the roller on the piston or the shoe of the low friction coefficient material, so that a highly efficient cylinder can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of a rodless cylinder. FIG. 2 is a plan view of a rodless cylinder. FIG. 3 is a sectional view of a piston. FIG. 4 is a sectional view of another type of piston. [Explanation of reference symbols] 1 hose 11 hose 2 piston 12 piston 2a roller 12a roller 2b roller 12b roller 2f shoe 14a pinch roller 2g shoe 14b pinch roller 3 carrier 4a pinch roller 4b pinch roller 6 guide roller 8 frame

Claims (1)

[Claims] [Claim 1] Rollers (2a) and (2b) for transmitting a piston force due to fluid pressure to pinch rollers (4a) and (4b) and [14a and 4b] via hoses (1) and [11]. , [12a and 12b] or hoses (1), [11] with built-in slidable pistons (2), [12] with shoes (2f) and (2g)
And a carriage (3) having pinch rollers (4a) and (4b), [14a and 14b], and a frame (8) for traveling the carriage (3).