JPH11125213A - Fluid pressure cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pressure cylinder which can be fixed to a frame, etc., with a short fixing bolt irrespective of a stroke of the fluid pressure cylinder and moreover is short in the whole length and small-typed and inexpensive. SOLUTION: In a fluid pressure cylinder having a cylinder tube 11, a rod cover 14 and a head cover 15, the peripheral wall of the cylinder tube 11 is provided with ports 16, 17 to supply and to discharge a pressure fluid, and a tie-rod 18 is passed through the first through hole 141h provided in the rod cover 14 and the second through hole 151h provided in the head cover, and they are fastened to unite the rod cover 14, a head over 15 and the cylinder tube 11. In addition, at least either of the rod cover 14 or the head cover 15 is provided with bulged out parts 141, 151 bulged outward in the radial direction more than an external form at the end of the cylinder tube and moreover provided with the third through holes 141H, 151H provided in the bulged out part for attaching this fluid pressure cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder having an improved mechanism for mounting the apparatus on a frame or the like of the apparatus.

[0002]

2. Description of the Related Art FIG.
7 is a diagram showing a right side surface of FIG.

As shown in FIGS. 6 and 7, a fluid pressure cylinder 80 includes a cylinder tube 81, a rod cover 82,
It comprises a piston rod 83, a piston 84 and the like. The cylinder tube 81 is formed into a bottomed cylindrical shape with one end opened by turning a solid material. A female screw is formed on the inner wall of the opening, and a male screw provided on the outer shape of the rod cover 82 is screwed into the female screw and fixed. Further, in the peripheral wall of the cylinder tube 81, through holes 87a to 87d which penetrate in the axial direction between both end surfaces are provided. A fixing bolt (not shown) for fixing the fluid pressure cylinder 80 to a frame or the like is passed through the through holes 87a to 87d.

[0004]

In the above-described conventional hydraulic cylinder 80, the turning operation for providing the fluid chamber 85 and the through holes 87a to 87d in the cylinder tube 81 requires much labor and time. In particular, when the stroke is long, processing for forming the fluid chamber 85 requires a lot of time and material loss is large.

In order to avoid such a problem, an extruded material having a hole corresponding to the fluid chamber 85 is used as a material of the cylinder tube 81. In that case, a large diameter portion is formed on both end surfaces of the extruded material, and a groove for a female screw or a stop ring is formed in the large diameter portion. The rod cover and the head cover are fitted into the large-diameter portion, and are fixed with screws or retaining rings. However, in this case, in order to provide a large diameter portion and form a female screw and a groove for a retaining ring in the large diameter portion,
The overall length of the fluid pressure cylinder becomes long.

A hydraulic cylinder using an extruded material having a hole or a hydraulic cylinder 8 shown in FIGS.
In either case, since the fixing bolt is inserted through a hole penetrating the entire length of the cylinder tube in order to fix the fluid pressure cylinder to the frame or the like, the length of the fixing bolt becomes longer. In particular, when a hexagon socket head cap bolt is used as the fixing bolt, the longer it becomes, the more difficult to obtain.

Further, a rod cover and a cylinder tube,
In addition, the stress due to the fluid pressure is concentrated at the respective connecting portions of the head cover and the cylinder tube, so that the material is easily fatigued, which contributes to shortening the life of the fluid pressure cylinder.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and enables a fluid pressure cylinder to be fixed to a frame or the like with a short fixing bolt regardless of a stroke. It is intended to provide a pressure cylinder.

[0009]

According to a first aspect of the present invention, there is provided a fluid pressure cylinder having a cylinder tube, a rod cover, and a head cover. Ports 16 and 17 for supplying / discharging the air, and a first through hole 141h provided in the rod cover 14 are provided.
And a second through hole 15 provided in the head cover 15
1h, the rod cover 14, the head cover 15, and the cylinder tube 11 are integrated by tightening the tie rod 18 with at least 1h. At least one of the rod cover 14 and the head cover 15 is an end face of the cylinder tube 11. Protruding portion 14 protruding outward in the radial direction from the outer shape of
1, 151, and third through holes 141H, 151H provided in the protruding portions 141, 151 for mounting the fluid pressure cylinder 1.

In the hydraulic cylinder according to the second aspect of the present invention, the rod cover 14 or the head cover
Is configured to cover the opening of the cylinder tube 11 by directly contacting the end surface of the cylinder tube 11.

The first through hole 141h and the second through hole 1
Each of 51h may be a drilled hole or one of them may be a screw hole. The third through hole 141H,
151H can be a drilled hole or a screw hole.

The tie rod 18 has a first through hole 141h.
And through the second through-hole 151h, it may pass through the outside of the cylinder tube 11 as shown in FIG. 1, or may provide an axial through-hole in the cylinder tube 11 and pass through the through-hole. It may be.

Since the rod cover 14 and the head cover 15 are not provided with ports, the protruding portions 14 are not provided.
By forming 1,151 on the same plane as the rod cover 14 or other portions of the head cover 15, the thickness can be reduced.

The outer shape of the end surface of the cylinder tube 11 can be various shapes such as a gourd shape, a lantern shape, an elliptical shape, a diamond shape, or a rectangular shape. The protruding portions 141 and 151 may be provided on only one of the rod cover 14 and the head cover 15.

[0015]

1 is a front view showing a cross section of a part of a hydraulic cylinder 1, FIG. 2 is a left side view of the hydraulic cylinder 1 of FIG. 1, and FIG. 3 is a hydraulic cylinder 1 of FIG. Right side view of the
FIG. 4 is a plan view of the hydraulic cylinder 1 of FIG. 1, and FIG.
It is a front view which shows the state in which the hexagon socket head cap screw BT for fixing was inserted in H.

As shown in FIG. 1, a hydraulic cylinder 1
Are a cylinder tube 11, a piston 12 sliding on the inner peripheral surface of the cylinder tube 11, a piston rod 13 connected to the piston 12, a rod cover 14 for closing the rod side of the cylinder tube 11, a cylinder tube 11
Cover 15 and tie rod 1 for closing the head side of
8, bush 19, dust wiper 21, rod packing 2
2, O-ring 23, piston packing 24, head cover seal 25, magnet 26 as a means for detecting the position of piston 12, magnet retaining ring 27 for fixing magnet 26, and the like.

As shown in FIG. 2 and FIG. 3, the outer shape of each end face of the cylinder tube 11
The shape is such that two places in the 80-degree direction bulge outward. Ports 16 and 17 for supplying and discharging a pressurized fluid are provided on the upper surface of the peripheral wall of the cylinder tube 11.

The outer shape of the rod cover 14 is substantially rectangular. Therefore, in relation to the outer shape of the cylinder tube 11, the cylinder tube 11 has a total of four protruding portions 141 protruding outward in the radial direction from the outer diameter of the end surface of the cylinder tube 11. Each protruding portion 141 is provided with a through hole 141H and a screw hole 141h penetrating in a direction perpendicular to the respective surfaces, that is, in the axial direction.

As with the rod cover 14, the head cover 15 also has a total of four protruding portions 151 protruding outward in the radial direction from the outer diameter of the end surface of the cylinder tube 11, and each protruding portion 151
Are provided with through holes 151H and 151h penetrating in the axial direction.

The tie rod 18 is passed through the screw hole 141h and the through hole 151h facing the screw hole 141h, and the rod cover 14, the head cover 15, and the cylinder tube 11 are integrated by tightening the tie rod 18. Therefore, the axial thrust due to the fluid pressure in the cylinder tube 11 is received by the tie rod 18, and the cylinder tube 11 and the rod cover 1 are received.
4. In the head cover 15, there is no portion where stress due to fluid pressure is extremely concentrated.

For this reason, the fluid pressure cylinder 1 is hardly damaged, and the life can be extended. Further, since the tie rod 18 is exposed outside the cylinder tube 11, switches such as a position detection switch can be attached as needed.

Further, since there is no portion where stress due to fluid pressure is extremely concentrated, there is no need to use a special material having high strength as the material of the cylinder tube 11, so that the sectional shape of the cylinder tube 11 can be freely designed. Therefore, grooves of various shapes for mounting a position detection switch or the like can be provided on the outer peripheral surface of the cylinder tube 11.

That is, since stress is concentrated in the case of an integrated structure as shown in FIG. 6, when the external dimensions are standardized, it is necessary to use a high-strength material as a material for the cylinder tube and the like. Then, when an extruded product made of an aluminum alloy is used as the cylinder tube, it is difficult to form a high-strength aluminum alloy into a fine and complicated shape due to poor fluidity.
Therefore, it is difficult to provide a fine groove on the outer peripheral surface of the cylinder tube. On the other hand, in the fluid pressure cylinder 1 of the present embodiment, since it is not necessary to use a high-strength material as the material of the cylinder tube 11, it is easy to provide a fine groove on the outer peripheral surface of the cylinder tube 11. You can.

The through-holes 141H and 151H are holes through which bolts BT with hexagonal holes for fixing pass.
Rod cover 1 is inserted into through hole 141H or through hole 151H.
4 or a bolt BT with a hexagonal hole from the inside to the outside of the head cover 15, and can be fixed by screwing into a screw hole or the like provided in a frame of the apparatus.

Hexagonal bolt BT used in this case
Is sufficient to penetrate through the thickness of the rod cover 14 or the head cover 15, and therefore may be short regardless of the stroke of the fluid pressure cylinder 1. Therefore, it is easy to obtain such a hexagon socket head cap screw BT, and the user of the hydraulic cylinder 1 can easily attach the hydraulic cylinder 1.

When the fluid pressure cylinder 1 is fixed to a frame or the like, it can be fixed to either the rod cover 14 or the head cover 15. It can also handle rear piping. In addition, since the through holes 141H and the through holes 151H are provided in the protruding portions 141 and 151, the processing thereof is easy.

In order to increase the stroke of the hydraulic cylinder 1, it is only necessary to change the cylinder tube 11, the piston rod 13, and the tie rod 18 to longer ones. The rod cover 14, the head cover 15, and the fixing hexagon The bolt BT with a hole can be used in common for various strokes. Therefore, it is easy to improve the production efficiency by mass-producing them and reduce the cost.

The end surfaces of the rod cover 14 and the head cover 15 cover the opening of the cylinder tube 11 by directly contacting the end surfaces of the cylinder tube 11.
There is no need to provide grooves for the end surfaces of the cylinder tube 11 to be fitted exactly into the end surfaces of the rod cover 14 and the head cover 15. Therefore, it is also possible to correspond to a cylinder tube having a different outer shape of the opening. Further, the rod cover 14 and the head cover 15 are not provided with ports, and the protruding portions 141 and 15 are not provided.
Since 1 is formed on the same plane as the other parts, the thickness thereof can be reduced, and the overall length of the hydraulic cylinder 1 can be shortened instead of the stroke.

In the above-described embodiment, the outer shape of the end surface of the cylinder tube 11 can be various other shapes such as an ellipse and a rectangle. The outer shape of the rod cover 14 and the head cover 15 may be any shape as long as the rod cover 14 and the head cover 15 have protruding portions 141 and 151 that protrude outward in the radial direction from the outer shape of the end surface of the cylinder tube 11.

In the above-described embodiment, both the rod cover 14 and the head cover 15 have the protruding portions 141 and 151, respectively, but either the rod cover 14 or the head cover 15 has the protruding portions. May be done. The tie rod 18 passes outside the cylinder tube 11,
An axial through-hole may be provided in the cylinder tube 11 so as to pass through the through-hole. In addition, the structure, shape, material, number, etc. of the whole or each part of the fluid pressure cylinder 1 can be appropriately changed according to the gist of the present invention.

[0031]

According to the present invention, the hydraulic cylinder can be fixed to a frame or the like with a short fixing bolt irrespective of the stroke, and the total length of the hydraulic cylinder is small and low-cost can be provided. .

[Brief description of the drawings]

FIG. 1 is a front view showing a cross section of a part of a hydraulic cylinder according to the present invention.

FIG. 2 is a left side view of the hydraulic cylinder of FIG.

FIG. 3 is a right side view of the hydraulic cylinder of FIG. 1;

FIG. 4 is a plan view of the hydraulic cylinder of FIG. 1;

FIG. 5 is a front view showing a state in which a hexagon socket head cap screw for fixing is inserted into a through hole of the rod cover.

FIG. 6 is a front sectional view of a conventional hydraulic cylinder.

FIG. 7 is a right side view of the fluid pressure cylinder shown in FIG. 6;

[Explanation of symbols]

 Reference Signs List 1 fluid pressure cylinder 11 cylinder tube 14 rod cover 15 head cover 16 port 17 port 18 tie rod 141 protruding portion 151 protruding portion 141h screw hole (first through hole) 141H through hole (third through hole) 151h through hole (second Through hole) 151H Through hole (third through hole)

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[Procedure amendment]

[Submission date] November 7, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (2)

[Claims] 1. A hydraulic cylinder having a cylinder tube, a rod cover, and a head cover, wherein a port for supplying and discharging pressure fluid is provided on a peripheral wall of the cylinder tube, and the port is provided on the rod cover. The rod cover, the head cover, and the cylinder tube are integrated by tightening a tie rod through a first through hole and a second through hole provided in the head cover. At least one has a protruding portion protruding radially outward from the outer shape of the end face of the cylinder tube, and a third through hole provided in the protruding portion for mounting the hydraulic cylinder. A fluid pressure cylinder characterized by: 2. The fluid pressure cylinder according to claim 1, wherein an end face of said rod cover or said head cover is configured to cover an opening of said cylinder tube by directly contacting an end face of said cylinder tube.