JPH04219571A - Device for cover fitting to pressure vessel - Google Patents

Abstract

PURPOSE:To provide a cover mounting device for pressure vessels such as accumulator, gas spring or hydraulic cylinder by making the outer diameter of the outer end side larger than an engaging peripheral groove of the cover and the inner diameter of a fixed ring so that the ports or the like can be easily formed in the cover. CONSTITUTION:A cylinder tube 11 and a cover 14 closing the end faces thereof are provided to fix the cover 14 to the cylinder tube 11 with a fixed ring 21 attached to engaging peripheral grooves 22, 24 provided respectively on the outer peripheral surface of the cover 14 and the inner peripheral surface of the cylinder tube 11. The cover 14 is provided with a peripheral groove 25 contiguous axially outward to the engaging peripheral groove 24 and capable of fitting the fixed ring 21 for attachment and removal. After the cover 14 is inserted into the cylinder tube 11 while the fixed ring 21 is inserted into the peripheral groove 25 for attaching and removing the cover 14, the fixed ring 21 is shifted from the peripheral groove 25 for attachment and removal into the engaging peripheral groove 22 so that the cover 14 is fixed to the cylinder tube 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover attachment device for pressure vessels such as accumulators, gas springs, or hydraulic cylinders.

0002

[Prior Art] Conventionally, in a pressure vessel having a cylinder tube and a cover that closes the end face of the cylinder tube, the cover is attached to an engagement circumferential groove provided on the outer circumferential surface of the cover and on the inner circumferential surface of the cylinder tube. A cover mounting device has been proposed in which the cover is fixed to the cylinder tube using a fixed ring.

FIG. 5 is a partial cross-sectional view of a cover attachment device 51 in a conventional pressure vessel 50. As shown in FIG.

In FIG. 5, the fixing ring 6 extends between an engaging circumferential groove 71 provided on the outer circumferential surface of the cover 61 and an engaging circumferential groove 72 provided on the inner circumferential surface of the cylinder tube 62.
3 is attached, and the cover 61 is tightened by tightening the nut 64 screwed onto the outer peripheral surface of the cover 61.
1 is pulled outward, the cover 61 and the fixing ring 63
is fixed.

[0005]

[Problems to be Solved by the Invention] However, in the above-mentioned cover mounting device 51, since it is necessary to attach the fixing ring 63 to the engagement circumferential groove 71, it is necessary to attach the fixing ring 63 to the outer end of the cover 61 than the engagement circumferential groove 71. The outer diameter of the side cannot be larger than the inner diameter of the fixing ring 63. Therefore, the thickness of the cover 61 in the radial direction cannot be increased, and a port for supplying and discharging fluid into the pressure vessel 50 cannot be provided in the cover 61.

Therefore, in the pressure vessel 50 shown in FIG.
A boss 65 is welded to the cylinder tube 62, and this boss 6
5 is provided with a port 66. This requires welding to the cylinder tube 62, drilling, and finishing and cleaning of the inner circumferential surface after drilling, which increases the number of steps and increases costs.

[0007] Instead of welding the boss 65, the wall pressure of the cylinder tube 62 is increased to make the cylinder tube 6
If a port is formed directly on the cylinder tube 2, the material cost and weight of the cylinder tube 62 will increase.

Furthermore, if, for example, the fixing ring 63 is not used and screws are formed on the outer peripheral surface of the cover 61 and the inner peripheral surface of the cylinder tube 62 and screwed together, the cost for processing the screws will be reduced. In addition to being expensive, special attention must be paid to the rotation prevention and sealing of the cover 61.

In view of the above-mentioned problems, the present invention allows the outer diameter of the outer end of the engagement groove of the cover to be larger than the inner diameter of the fixing ring, and makes it possible to easily form ports etc. on the cover. The purpose of this invention is to provide a cover attachment device that allows for

0010

Means for Solving the Problems In order to solve the above-mentioned problems, an apparatus according to the invention of claim 1 includes a cylinder tube and a cover that closes an end surface of the cylinder tube, and an outer circumferential surface of the cover. and a pressure vessel in which the cover is fixed to the cylinder tube by a fixing ring attached to a circumferential engagement groove provided on the inner circumferential surface of the cylinder tube, wherein the cover is fixed to the cylinder tube. At a position where it can face the engagement circumferential groove of the cylinder tube when inserted into the cylinder tube, it continues outward in the axial direction with respect to the engagement circumferential groove and the fixing ring is fittable. A circumferential groove for attaching and detaching is provided, and after the cover is inserted into the cylinder tube with the fixing ring fitted into the circumferential groove for attaching and detaching the cover, the fixing ring is inserted into the circumferential groove for attaching and detaching. The cover is fixed to the cylinder tube by moving from the cover into the engagement circumferential groove.

In the device according to the second aspect of the invention, an elastic annular member is mounted in a compressed state between the end face of the cylinder tube and the end face of the cover.

In the device according to the second aspect of the present invention, the cover is provided with an axial through hole extending from the outer end surface of the cover to the attachment/detachment groove, and the cylinder tube is provided with an axial through hole extending from the outer end surface of the cover to the attachment/detachment circumferential groove. A through hole is provided from the outer circumferential surface to the engagement circumferential groove.

[0013]

[Operation] The fixing ring is installed between the engagement circumferential groove of the cover and the engagement circumferential groove of the cylinder tube, and is fixed by engaging each other in the axial direction.

[0014] When the cover mounting device is assembled or disassembled, a fixing ring is fitted into the circumferential groove for attachment and detachment provided in the cover, thereby making it possible to insert or remove the cover from the cylinder tube.

[0015] The annular member urges the cover and the cylinder tube in opposite axial directions by its elastic force, thereby preventing their movement. Moreover, it is also possible to serve as a seal between the cover and the cylinder tube.

[0016] The through hole is for facilitating movement of the fixing ring by inserting a suitable pin-shaped attachment/detachment jig.

[0017]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a pressure vessel 1 according to the present invention.

The pressure vessel 1 includes a cylinder tube 11, a piston 12 that is slidable within the cylinder tube 11, a piston rod 13 that is integrated with the piston 12, and covers 14 and 15 that close both ends of the cylinder tube 11. are doing.

Each of the covers 14 and 15 has a circular cross section, and has flesh pressure portions 14a and 15a formed at their respective outer ends and having an outer diameter that is approximately the same as the outer diameter of the cylinder tube 11, as will be described later. It is fixed to the cylinder tube 11 by cover mounting devices 2 and 3 using a fixing ring 21 that is divided into two parts. Since the cover attachment devices 2 and 3 have similar configurations, only one cover attachment device 2 will be described.

An engaging circumferential groove 22 having a semicircular cross section is formed on the inner circumferential surface of the cylinder tube 11, and a taper continuous to the engaging circumferential groove 22 is formed on the axially inner side of the engaging circumferential groove 22. A shaped guide portion 23 is formed.

The outer peripheral surface of the cover 14 has a cross section of 1/4
An arc-shaped engagement circumferential groove 24 corresponding to the circumference is formed, and the engagement circumferential groove 24
An attachment/detachment circumferential groove 25 is formed on the outside in the axial direction, which is continuous with the engagement circumferential groove 24 and into which the above-mentioned fixing ring 21 can be fitted.

This attachment/detachment circumferential groove 25 is formed in the engagement circumferential groove 2 of the cylinder tube 11 when the cover 14 is inserted into the cylinder tube 11 without attaching an annular member 26 to be described later.
It is formed at a position opposite to 2.

End face of cylinder tube 11 and cover 14
An annular member 26 having elasticity, such as an O-ring, is mounted between the end face and the end face in an axially compressed state.

The cover 14 is provided with through holes 31 and 32 extending in the axial direction from its outer end surface to the circumferential attachment/detachment groove 25. Further, the cylinder tube 11 is provided with a through hole 33 extending from its outer circumferential surface to the engagement circumferential groove 22 . Two of these through holes 31, 32, and 33 are provided on opposite sides.

[0026] Flesh pressure parts 14a, 15a of covers 14, 15
are provided with ports 16 and 17 that communicate with the fluid chambers 41 and 42. In addition, 18 is a dust wiper, 19,
19... is a packing.

FIG. 2 is an enlarged front view of the fixing ring 21, and FIG.
is an enlarged view of the end of the fixed ring piece 21a.

In these figures, the fixing ring 21 is
It consists of fixing ring pieces 21a, 21a which are exactly divided in half. Each fixing ring piece 21a has the outer peripheral surface side of both ends thereof planarly shaved off, and a chamfered portion 21 is formed thereon.
b, 21b are formed.

Next, the assembly of the above-mentioned pressure vessel 1 and cover attachment devices 2 and 3 will be explained.

First, cover 1 is attached to cylinder tube 11.
The cover 15 is shown in FIG.
into the inner peripheral surface of the cylinder tube 11 from the left side.

At this time, the fixing ring 21, cover 14,
Paying attention to the mutual circumferential positions of the cylinder tubes 11 and 11, the through holes 31, 32, 33
Make sure it is in the center of a.

Next, insert a suitable elongated pin-shaped attachment/detachment jig (see FIG. 4) through the through holes 31 and 32, and attach the fixing ring 2.
1 to move it from the attachment/detachment circumferential groove 25 to the engagement circumferential groove 22. At this time, by pulling the cover 15 outward and moving it slightly, the fixing ring 21 can be attached to the engagement circumferential groove 22,
It is installed in 24.

Thereafter, the annular member 26 is attached using its elasticity.

Next, the piston 1 is attached to the cylinder tube 11.
2 and the cover 14 is installed in the same manner as described above. Note that the slight outward movement of the covers 14 and 15 will occur after both covers 14 and 15 are inserted.
, 17 can also be used to supply pressure fluid.

Inside the engagement circumferential grooves 22 and 24, both ends of each fixing ring piece 21a are pushed outward and undergo elastic deformation in the direction of increasing the diameter (see FIG. 3), so that each fixing ring piece 21a Since the piece 21a is attached to the circumferential grooves 22, 24 while having elastic force, it is securely fixed without wobbling.

Furthermore, the elasticity of the annular member 26 prevents the covers 14 and 15 from moving inward in the axial direction of the cylinder tube 11.
and the cylinder tube 11 are sealed.

When disassembling the pressure vessel 1, the annular member 26 is removed, the covers 14 and 15 are moved axially inward, and the attachment/detachment is performed in the same manner as described above through the through hole 33 formed on the outer peripheral surface of the cylinder tube 11. After inserting the jig and dropping the fixing ring 21 into the circumferential attachment/detachment groove 25, the covers 14, 15 are pulled outward and removed.

FIG. 4 is a front view showing an example of the attachment/detachment jig 45.

The attachment/detachment jig 45 includes a pin 46 that can be inserted into the through hole 31 and a support portion 47. Support part 47
Screws are provided on the outer peripheral surface of the through hole 32 and the inner peripheral surface of the through hole 32,
The fixing ring 21 can also be configured to be pushed by screwing these together.

As described above, it is easy to assemble and disassemble the pressure vessel 1, and it becomes even easier by using the above-mentioned attachment/detachment jig 45.

In the embodiment described above, the covers 14, 15
An engaging portion for preventing rotation may be provided between the cylinder tube 11 and the cylinder tube 11 . One of the covers 14 and 15 may be integral with the cylinder tube 11. The fixing ring 21 may be divided by cutting one or three or more places in the circumferential direction. Others, cover 14
, 15, the fixing ring 21, the cover attachment devices 2 and 3, and the structure, shape, size, material, quantity, etc. of each part of the pressure vessel 1 can be changed in various ways other than those described above.

[0042]

[Effects of the Invention] According to the present invention, the outer diameter of the outer side of the engagement circumferential groove of the cover can be made larger than the inner diameter of the fixing ring, and the cover can be mounted with ease in which ports etc. can be formed on the cover. equipment can be provided.

According to the second aspect of the invention, it is possible to prevent the movement of the cover and to seal it, and the number of parts can be reduced accordingly, thereby reducing costs.

According to the third aspect of the invention, the fixing ring can be easily moved, and the pressure vessel can be more easily assembled or disassembled.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a pressure vessel according to the present invention.

FIG. 2 is an enlarged front view of the fixing ring.

FIG. 3 is an enlarged view of the end of the retaining ring piece.

FIG. 4 is a front view showing an example of the attachment/detachment jig.

FIG. 5 is a partial cross-sectional view of a conventional cover attachment device for a pressure vessel.

[Explanation of symbols]

1 Pressure vessel 2, 3 Cover mounting device 11 Cylinder tube 14,15 Cover 21 Fixed ring 22, 24 Engagement circumferential groove 25 Circumferential groove for attachment and detachment 26 Annular member 31, 32 Through hole 33 Through hole

Claims (3)

[Claims] 1. A fixing device comprising a cylinder tube and a cover that closes an end face of the cylinder tube, the fixing device being installed in an engagement circumferential groove provided on an outer circumferential surface of the cover and an inner circumferential surface of the cylinder tube, respectively. In a pressure vessel in which the cover is fixed to the cylinder tube by a ring, the cover has a structure that the cover faces the engagement circumferential groove of the cylinder tube when the cover is inserted into the cylinder tube. At possible positions, an attachment/detachment circumferential groove is provided that is continuous with the engaging circumferential groove axially outward and into which the fixing ring can be fitted, and the fixing ring is connected to the attachment/detachment circumferential groove of the cover. After the cover is inserted into the cylinder tube in a state where the cover is fitted into the cylinder tube, the fixing ring moves from the attachment/detachment circumferential groove to the engagement circumferential groove, thereby fixing the cover to the cylinder tube. A cover attachment device for a pressure vessel, characterized in that: 2. A cover mounting device for a pressure vessel according to claim 1, wherein an elastic annular member is mounted in a compressed state between the end face of the cylinder tube and the end face of the cover. . 3. The cover is provided with an axial through hole extending from the outer end surface of the cover to the attachment/detachment circumferential groove, and the cylinder tube is provided with an axial through hole extending from the outer circumferential surface of the cylinder tube to the engagement circumferential groove. 3. The pressure vessel cover mounting device according to claim 1, further comprising a through hole extending through the pressure vessel.