JP3070883U - Fluid pressure cylinder device - Google Patents

Abstract

(57) [Summary] An object of the present invention is to make it possible to determine a rotational angle position of a cylinder tube and a cover at a predetermined position without requiring a long tie rod. A fluid pressure cylinder device (1) having a cover (15) for closing an end surface of a cylinder tube (11), wherein a ring member (16) is provided on an outer peripheral surface of an end portion of the cylinder tube (11). Member 16
The cover 15 is fixed to the cylinder tube 11 by bolts 17 screwed into the screw holes 21.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a fluid pressure cylinder device, and more particularly to a fastening structure between a cylinder tube and a cover thereof.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, hydraulic cylinder devices such as hydraulic cylinders, pneumatic cylinders, and hydraulic cylinders have been used for all types of machinery including automobile production lines.

[0003] The fluid pressure cylinder device usually has a cylinder tube in which a piston slides and a cover for closing both end surfaces of the cylinder tube. However, there are various methods for fastening the cylinder tube and the cover. There is.

For example, in a tie rod type hydraulic cylinder device 80 shown in FIG. 3, a rod cover 85 and a head cover 84 arranged at both ends of a cylinder tube 81 are fastened and assembled by four tie rods 86. ing. A piston (not shown) slides on the inner peripheral surface of the cylinder tube 81, and a piston rod 83 connected to the piston penetrates a rod cover 85 and protrudes to the outside.

[0005] In the screw-type hydraulic cylinder device 80B shown in FIG. 4, the cover 84B and the cylinder tube 81B are directly screwed and fastened with screws.

[0006]

[Problems to be solved by the invention]

 However, according to the former fastening method described above, if the stroke becomes longer and the cylinder tube 81 becomes longer, a correspondingly longer tie rod 86 is required, which increases the cost.

In addition, since the tie rods 86 protrude considerably from the end surfaces of the rod cover 85 and the head cover 84, there is a problem that the external dimensions are increased by that much and space for mounting is required.

Further, according to the latter fastening method described above, it takes a long time to machine the screw, particularly when the outer diameter of the cylinder tube 81 is large, and therefore the machining cost is high. There is. Further, since the cylinder tube 81B and the cover 84B are relatively rotated and fastened to each other, the rotational angle positions of the cylinder tube 81B and the cover 84B when the screws are closed are not constant, and there is a problem that it is difficult to align the circumferential position of the port PT. .

The present invention has been made in view of the above-described problem, and does not require a long tie rod, and a fluid pressure that can determine a rotational angle position between a cylinder tube and a cover at a predetermined position. It is an object to provide a cylinder device.

[0010]

[Means for Solving the Problems]

 The device according to the invention of claim 1 is a fluid pressure cylinder device having a cover for closing an end surface of a cylinder tube, wherein a ring member is provided on an outer peripheral surface of an end portion of the cylinder tube, and A screw hole is formed over the tube and the ring member, and the cover is fixed to the cylinder tube by a bolt screwed into the screw hole.

In the device according to the invention of claim 2, the screw hole is formed around a boundary between the cylinder tube and the ring member. In the device according to the invention of claim 3, the ring member is fitted to the cylinder tube by a close fit.

[0012]

[Embodiment of the invention]

 FIG. 1 is a sectional front view showing a main part of the hydraulic cylinder device 1 according to the present invention, and FIG. 2 is a right side view of the hydraulic cylinder device 1 of FIG.

In these figures, a fluid pressure cylinder device 1 includes a cylinder tube 11, a piston (not shown) sliding on the inner peripheral surface of the cylinder tube 11, a piston rod (not shown) connected to the piston, a rod cover (not shown), It comprises a head cover 15, a ring member 16, a bolt 17, and the like.

The overall configuration of the fluid pressure cylinder device 1 is the same as the conventionally known one as shown in FIG. 3, except for the connection structure between the cylinder tube 11 and the rod cover and the head cover 15. is there.

The cylinder tube 11 has a cylindrical shape, and its inner peripheral surface is loosely fitted to the outer periphery of the protruding portion 15 a of the head cover 15, and is sealed by a packing 18.

The inner diameter of the ring member 16 is equal to the outer diameter of the cylinder tube 11, and the thickness thereof is substantially the same as the thickness of the cylinder tube 11. The length in the axial direction, that is, the width dimension, is equal to or greater than the depth of the screw hole 21 provided therein and is such a length that the screw is not exposed, for example, about several centimeters to ten and several centimeters.

The ring member 16 is axially pressed into the outer peripheral surface of the cylinder tube 11 so that its end surface is flush with the end surface of the cylinder tube 11. Fitted by tight fit.

On the end surfaces of the cylinder tube 11 and the ring member 16, a plurality of screw holes 21 having their boundaries at the center are formed in equal parts along the circumferential direction. In the head cover 15, bolts 17, 17,... Inserted through a plurality of (six in the present embodiment) holes 22 provided along the circumferential direction are screwed into the screw holes 21, 21,. By being tightened, it is fixed to the cylinder tube 11.

In this example, a bolt with a hexagonal hole is used as the bolt 17, but other types of bolts, for example, a hexagonal bolt, a square bolt, or the like may be used. As a material of the cylinder tube 11 and the ring member 16, it is possible to use steel, a stainless alloy, an aluminum alloy, a zinc alloy, a synthetic resin, or the like.

Although not shown, the rod cover is also fixed to the cylinder tube 11 in the same manner as the head cover 15. As described above, in the fluid pressure cylinder device 1, the head cover 15 and the rod cover are each fixed by the plurality of (six in the present embodiment) bolts 17, and a tie rod as in the related art is not used. Further, since a screw is not formed on the outer peripheral surface of the cylinder tube 11 for rotation, a long tie rod is not required, and the rotational angle position of the cylinder tube 11 with respect to the head cover 15 or the rod cover is determined. The position can be determined by design. Therefore, the position of the port PT is fixed.

Further, since the cylinder tube 11 and the ring member 16 are connected to each other by tight fitting, the strength of the screw hole 21 can be ensured, and the dust between the cylinder tube 11 and the ring member 16 can be secured. It is hygienic without accumulation of dust.

In the above embodiment, the cylinder tube 11 and the ring member 16 may be fixed with an adhesive or welding. Alternatively, screws may be screwed in a plurality of locations on the outer peripheral surface of the ring member 16 in the radial direction to integrate them.

In the above embodiment, the screw hole 21 is provided centering on the boundary between the cylinder tube 11 and the ring member 16. However, if the cylinder tube 11 has a sufficient thickness, the screw hole 21 is used. May be offset to the cylinder tube 11 side.

In the above embodiment, the number of bolts 17 is six, but may be five or less or seven or more. However, two or more are desirable. A counterbore may be provided around the hole 22 of the head cover 15 so that the bolt 17 does not protrude outward. In addition, the structure, shape, dimensions, number, material, etc. of the cylinder tube 11, the ring member 16, the head cover 15, the whole or each part of the fluid pressure cylinder device 1, and the like can be various other than those described above. .

[0025]

[Effect of the invention]

 According to the present invention, the rotation angle position of the cylinder tube and the cover can be determined at a predetermined position without requiring a long tie rod.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing a main part of a hydraulic cylinder device according to the present invention.

FIG. 2 is a right side view of the hydraulic cylinder device of FIG.

FIG. 3 is a view showing a conventional tie rod type hydraulic cylinder device.

FIG. 4 is a view showing a conventional thread-type hydraulic cylinder device.

[Explanation of symbols]

 Reference Signs List 1 fluid pressure cylinder device 11 cylinder tube 15 head cover (cover) 16 ring member 17 bolt 21 screw hole

Claims (3)

[Utility model registration claims] 1. A fluid pressure cylinder device having a cover for closing an end surface of a cylinder tube, wherein a ring member is provided on an outer peripheral surface of an end portion of the cylinder tube. A fluid hole, wherein the cover is fixed to the cylinder tube by a bolt screwed into the threaded hole. 2. The fluid pressure cylinder device according to claim 1, wherein the screw hole is formed around a boundary between the cylinder tube and the ring member. 3. The hydraulic cylinder device according to claim 1, wherein the ring member is fitted to the cylinder tube by an interference fit.