JPH0332804Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to high-output cylinders, and more specifically, a rectangular male thread with a large thread height is formed in the body of the piston, and the lower side of the thread of the male thread is This invention relates to a high-output cylinder equipped with an elastic tube that increases the expanded height by introducing fluid pressure between it and a groove of a female thread.

b. Prior Art The output of a fluid pressure cylinder that is widely used in engineering is the product of the pressing force per unit area of fluid multiplied by the area of action, minus frictional resistance, etc.

Therefore, in order to obtain high output with conventional fluid pressure cylinders, it was necessary to obtain high pressure fluid with a powerful pump or booster and to increase the area of action when the frictional resistance was constant.

c. Problems to be solved by the invention In order to obtain high output using a fluid pressure cylinder in the prior art described above, the device must be made larger by either increasing the diameter of the cylinder or applying high pressure fluid. There were some inconveniences, such as leaks.

d Means for solving the problem The present invention provides a square thread with a large crest height on the piston, and provides a groove width on the inner wall of the cylinder part that is larger than the crest thickness of the male thread, so that there is a gap between the lower surface of the male thread and the female thread groove. By arranging an elastic helical tube in the cylinder, they devised a high-output cylinder with no leakage and increased fluid pressure receiving surface.

e Effect As already clear above, a cylinder with a relatively small diameter can provide several times the output of the conventional device,
Moreover, a high-output cylinder with no fluid leaks was obtained.

f Embodiment FIG. 1 is a sectional view of a high-output cylinder as an embodiment of the present invention.

A rectangular male thread 5 with a large thread height is provided on the body of the piston 3 of the high-output cylinder 1, and an example in which the thread turns four times is shown.

The inner wall of the outer cylinder portion 7 is provided with a square female thread 9 which is screwed into the square male thread 5 and whose groove width is larger than the thread thickness T of the male thread.

An elastic tube 11 that expands and increases in height by introducing fluid pressure is spirally provided between the groove width D of the square female screw 9 below the crest of the square male screw 5.

A fluid pressure source, such as hydraulic oil, is guided to the elastic tube 11 through an oil guide hole 13 shown on the lower left side of FIG.

A back cover 15 that also serves as an elbow from the oil guide hole 13 is attached to the vicinity of the lower end of the cylinder portion 7 with a snap spring 17 or the like, and a key 21 is engaged with a rotation prevention groove 19 provided at the lower end of the piston 3. There is.

A dust seal 23 is fitted and sealed at the upper end of the cylinder section 7 from which the piston 3 protrudes, and serves to prevent dust from entering between the piston 3 and the cylinder section 7 from the outside. . Furthermore, an appropriate number of air vent holes 25 are provided in the cylinder portion 7 on the right side in FIG.

Next, the operation of this device will be explained with reference to FIGS. 2 and 3.

FIG. 2 shows a state in which the piston 3 is descending due to its own weight or a load not shown, and the elastic tube 11
is flattened and has a low height dimension.

Therefore, there is an air portion sucked in from the air vent hole 25 above the square male screw 5.

FIG. 3 shows a case where pressure oil such as hydraulic oil is sent from the oil guide hole 13, and the elastic tube 11 increases in height until the upper surface of the square male screw 5 comes into close contact with the lower surface of the square female screw 9. It's tight.

g Effects of the invention As is already clear from the above, the high-output cylinder that embodies the technical idea of the invention does not have a larger diameter and does not require a fluid pressure intensifier compared to conventional cylinders. It achieved high output.

Furthermore, since there are no problems such as leaks when the fluid is pressurized, it is possible to realize a compact, low-cost, high-output cylinder.

It is also clear that the design can be easily changed without departing from the technical idea of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an explanatory view when the piston is lowered, and FIG. 3 is an explanatory view when the piston is raised and the output is used. Explanation of the symbols representing the main parts of the drawings: 1... High output cylinder, 5... Square male thread, 7... Cylinder part, 9... Square female thread, 11... Elastic body tube, T...
Male thread thickness, D...Female thread groove width.

Claims (1)

[Scope of utility model registration request] A square male thread with a large thread height is formed on the body of the piston, and a female square thread is provided on the inner wall of the cylinder portion, which is threadedly engaged with the square male thread, and whose groove width is larger than the thread thickness of the male thread. A high-output cylinder characterized by being provided with an elastic tube that expands and increases in height by introducing fluid pressure between the lower side of a male thread and a female thread groove.