JPS63280962A - Pressure container made of composite material - Google Patents

Abstract

PURPOSE:To prevent any separation between a cover and the end surface of an inner cylinder or the like by disposing an O-ring between the outer peripheral side of the axial end of an inner surface and the inner peripheral side of an attaching member of a pressure container made of composite material used for hydraulic cylinder or high pressure container and the like. CONSTITUTION:A ring shaped recess portion 11, formed from the end surface 4D to the inner surface 4C of the attaching member 4 of a composite-material- made pressure container comprising an inner cylinder 2 and outer cylinder 3 formed by fiber reinforced resin material and a metal attaching member 4 provided for attaching a cylinder cover 6, extends by a predetermined length from the end surface 4D in an axial direction, and formed coaxially with the inner peripheral surface 4C of the attaching member 4. An O-ring 12 is arranged in this recess portion 11. Accordingly, even if any high pressure effects between the inner surface 2 and the attaching member 4, any separation between the inner cylinder 2 and the attaching member 4 can be prevented by sealing the gap therebetween by O-ring 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure vessel made of a composite material that is suitably used as a tube or a high-pressure vessel for, for example, a hydraulic cylinder or a pneumatic cylinder. The present invention relates to a pressure vessel made of a composite material that can be attached to a pressure vessel made of a composite material in a manner that prevents peeling of the joint portion between the parts and the like.

[Conventional technology]

The applicant had previously filed Japanese Patent Application No. 160198/1983,
No. 1-312477 (hereinafter referred to as prior art), etc., proposes a 1a fiber-reinforced resin cylindrical body as a composite material pressure vessel used as a tube of a hydraulic cylinder, a pneumatic cylinder, or the like.

Therefore, FIGS. 6 to 8 show a hydraulic cylinder tube as an example of a pressure vessel made of a composite material according to this type of prior art.

In the figure, l indicates a tube body, and the tube body 1 includes an inner tube 2 and an outer tube 03 formed in a long cylindrical shape from a fiber-reinforced resin material (composite material), and an inner tube 2 and an outer tube 3. The inner cylinder 2 and the outer cylinder 3 are located at both ends in the axial direction.
The metal attachment provided between the two is roughly composed of two members 4, 4 (however, only one is shown). here,
The inner cylinder 2 is formed by cross-winding thread-like fiber material impregnated with resin using a filament winding method or the like, and a piston (not shown) is slidable inside the inner cylinder 2. It is designed to be inserted.

On the other hand, each mounting member 4 is formed in a ring shape from a metal material such as carbon steel or aluminum alloy, and each mounting member 4 has a plurality of radially protruding parts on the outer circumferential side of the mounting member 4 at predetermined intervals in the circumferential direction. 4A of projections, and a tapered portion 4B formed to gradually reduce in diameter from the position of each projection 4A. The member 4 used for each installation is the tapered portion 4B.
It is fitted onto the outer circumference of the end of the inner tube 2 from the side, and its inner circumferential surface 4C is fixed to the outer circumferential surface 2A of the inner tube 2 by means of adhesive or the like. At this time, each attachment member 4 is arranged so that its end surface 4D is flush with the end surface 2B of the inner cylinder 2. In addition, a plurality of screw holes 5 are formed in the mounting member 4 at predetermined intervals in the circumferential direction and extend in the axial direction from the end face 4D side, so that a cylinder cover 6, etc., which will be described later, can be mounted. .

Furthermore, like the inner cylinder 2, the outer cylinder 3 is made of resin-impregnated filamentous fiber material by means such as filament winding, and each attachment is made from the outer peripheral surface of the inner cylinder 2 to the outer peripheral surface of the member 4. The fibrous material is formed by cross-wrapping it over the entire surface, and at this time, the fiber material is attached to each protrusion 4A of the member 4 for each attachment.
While being hooked onto and unwound, it is wound toward the outer circumferential surface of the inner tube 2 along the tapered portion 4B. The outer cylinder 3 firmly integrates the mounting members 4 on both ends of the inner cylinder 2, and also comes into close contact with the outer peripheral surface of the inner cylinder 2 to protect the inner cylinder 2. There is.

Note that the inner cylinder 2. The fiber material that is the material of the outer cylinder 3 may include carbon fiber, glass tam, aramid fiber, alumina fiber, or silicon carbide m! The resin used to impregnate the fiber material is epoxy resin, polyester resin, polyimide resin, or the like having thermosetting and adhesive properties. Also.

When forming the inner cylinder 2, this fibrous material is wound at a winding angle close to 90 degrees with respect to the central axis 0-0, for example, about 40 to 85 degrees, in order to increase pressure resistance. and,
When forming the outer cylinder 3, it is wound at a winding angle close to zero degrees, for example, about 5 to 30 degrees, with respect to the central axis 0-0, in order to increase the bending strength.

Next, 6 indicates a cylinder cover as a cover that covers one end side of the tube body 1, and the cylinder cover 6 corresponds to the disk portion 6A and the inner diameter of the inner tube 2 from the center of the disk portion 6A. The convex portion 6B is fitted into the inner periphery of the inner cylinder 2 on one end side. Then, the disk portion 6A of the cylinder cover 6 is brought into contact with the end surface 4D of the mounting member 4, and the mounting is carried out on the mounting member 4.
As shown in FIG. 6, it is fixed by each port 7 screwed into each screw hole 5 of. In addition, in FIG. 7, FIG. 8, etc., each port 7, etc. is omitted by a dashed line.

Furthermore, 8 indicates an O ring located on the outer circumferential side of the convex portion 6B of the cylinder cover 6 and inserted between the convex portion 6B and the inner cylinder 2; A seal is formed between the inner cylinder 2 and the inner cylinder 2 to prevent the pressure oil inside the inner cylinder 2 from leaking to the outside. The other end of the tube body 1 is covered with a rod cover (not shown) as a cover in almost the same way as the cylinder cover 6, and there is also an O ring between the rod cover and the inner cylinder 2, similar to the O ring 8. Ring (not shown)
is sealed by.

The tube for a hydraulic cylinder according to the prior art has the above-mentioned configuration, and the tube body 1 includes an inner cylinder 2 and an outer cylinder 3 formed of a fiber-reinforced resin material, the inner cylinder 2,
Each attachment provided between these on both ends of the outer cylinder 3 consists of a retaining member 4, and each attachment is made by hooking a fiber material impregnated with resin onto each protrusion 4A of the retaining member 4. While rewinding,
Since it is formed by winding it around the outer circumferential surface of the inner tube 2, the strength of the fiber material can be fully utilized and the tensile strength etc. of the tube body 1 can be greatly increased. A lightweight cylinder tube can be obtained.

[Problem that the invention seeks to solve]

By the way, in the above-mentioned prior art, the piston is slid by supplying and discharging pressure oil into the tube body l, and the load on the rod side is reduced.
(none of which are shown) is driven, the high pressure inside the inner cylinder 2 acts on the cylinder cover 6, etc., and the cylinder cover 6 is elastically deformed as shown by the two-dot chain line in FIG. A gap 9 may be formed between the disk portion 6A of the cylinder cover 6, the inner tube 2, and the end surface 4D of the mounting member 4.

The pressure inside the inner cylinder 2 fluctuates as the pressure oil is supplied and discharged, and the volume of the gap 9 expands and contracts each time the cylinder cover 6 repeats elastic deformation, so that it performs a kind of pumping action. become.

Therefore, in the prior art, high pressure is generated in the gap 9, and this high pressure enters between the outer peripheral surface 2A of the inner cylinder 2 and the inner peripheral surface 4C of the mounting member 4, which are bonded to each other. If this peeling gradually spreads between the inner tube 2 and the mounting member 4, there is an unresolved problem that the strength of the tube body 1 itself decreases.

In addition, especially when the pressure inside the inner cylinder 2 fluctuates shockingly,
The above problem is even more likely to occur in cases where pressure fluctuations occur repeatedly and impulsively, as in the case of an impulse tester.

Furthermore, since the outer cylinder 3 of the tube body 1 is formed of a fiber-reinforced resin material and is prone to elongation, the outer cylinder 3 will be exposed to the two parts shown in FIG. 8 when a large internal pressure is applied to the cylinder cover 6'3. As shown by the dotted chain line, the attachment extends in the axial direction together with the member 4, etc., and connects the disk portion 6A of the cylinder cover 6 and the inner cylinder 2.
A gap 10 may be formed between the end face, etc. of the gap l.

High pressure is generated in the same way as in the gap 9, and acts to cause separation between the outer circumferential surface 2A of the inner tube 2 and the inner circumferential surface 4c of the mounting member 4, thereby reducing the strength of the tube body l itself. It starts to decrease.

The gaps 9 and 10 do not occur individually, but are generated in a complicated manner overlapping each other, and while causing separation between the inner tube 2 and the mounting member 4, the tensile strength, etc. of the tube body 1 is gradually reduced. It will be lowered to . Incidentally, this phenomenon occurs almost similarly on the other end side of the tube body 1, that is, on the rod cover side.

The present invention was made in view of the problems of the prior art described above, and the present invention can prevent the inner cylinder and the mounting member from peeling off due to high pressure acting between them, and reduce the strength. The present invention provides a pressure vessel made of a composite material that can prevent the above-mentioned damage and improve its durability.

[Means for solving problems]

A feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that an O-ring is inserted between the outer peripheral side of the axial end of the inner cylinder and the inner peripheral side of the mounting member. .

[Effect]

Even if high pressure is applied between the inner cylinder and the mounting member, the O-ring can seal the gap between the inner cylinder and the mounting member, thereby preventing the inner cylinder and the mounting member from peeling off.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 5. In addition, in the embodiment, the above-mentioned figures 6 to 8 are used.
Components that are the same as those of the prior art shown in the figures are given the same reference numerals, and their explanations will be omitted.

1 and 2 show an embodiment of the il of the present invention.

In the figure, 11 is for mounting from the end surface 4D side of the member 4 to the inner circumferential surface 4.
The ring-shaped recess formed in C is shown.

The recess 11 extends in the axial direction from the end surface 4D by a predetermined length, and is attached coaxially with the inner circumferential surface 4C of the member 4. Reference numeral 12 indicates an O ring located between the inner cylinder 2 and the mounting member 4 and installed in the recess 11;
The ring 12 has its inner circumferential side 12A in contact with the outer circumferential surface 2A of the inner cylinder 2, and its outer circumferential side 12B in contact with the outer circumferential surface of the recess 11,
The left end side 12C shown in FIG. 2 is in contact with the bottom surface of the four parts 11. The O-ring 12 is connected to the inner cylinder 2.
The space between the mounting member 4 and the mounting member 4 is sealed.

The hydraulic cylinder tube according to this embodiment has the above-mentioned configuration, and its basic functions are not particularly different from those of the prior art.

However, in this embodiment, a ring-shaped recess 11 is formed on the inner peripheral surface 4C of the member 4 from the end surface 4D side, and the recess 1
Since the O-ring 12 is installed inside the inner cylinder 2 and the mounting member 4, a seal is formed between the inner cylinder 2 and the mounting member 4.
As illustrated in FIG. 8, there is a gap 9 between the disk portion 6A of the cylinder cover 6 and the end surface of the inner cylinder 2. 1O is formed and the empty spider 9. Even if high pressure is generated within the to, this high pressure will be applied to the outer circumferential surface 2A of the inner cylinder 2 and the inner circumferential surface 4 of the mounting member 4.
O-ring 12 enters between C and C to separate them.
This can be reliably prevented, and problems such as a decrease in the strength of the tube body 1 can be solved, and durability can be improved. In addition, the tube main body 1 can be maintained at high strength even against shocking pressure fluctuations, and it can also be used as a tube for a large hydraulic cylinder with high internal pressure.

Next, FIGS. 3 and 4 show a second embodiment of the present invention, and the feature of this embodiment is that the O-ring inserted between the inner cylinder and the mounting member is contacted by a spring. The reason is that pressure is applied.

In the figure, 21 is for mounting from the end surface 4D side of the member 4 to the inner circumferential surface 4.
A ring-shaped recess formed in C is shown, and although the recess 21 is formed almost the same as the recess 11 described in the first embodiment, its length is longer than that of the recess 11. . 22 indicates an O-ring installed in the recess 21, and the O-ring 22 is similar to the O-ring 1 described in the first embodiment.
2, the outer circumferential surface 2A of the inner cylinder 2 and the inner circumferential surface 4C of the mounting member 4 are sealed.

23 is a recessed portion 21 in order to apply contact pressure to the O-ring 22.
The spring 23 is formed of a disc spring or the like, and one end thereof is in contact with the disc portion 6A of the cylinder cover 6, and the other end is in contact with the flat backup ring 2.
4 and is in contact with the O-ring 22 through the 0-ring 22. The spring 23 has a gap between the outer circumferential side 22B of the O-ring 22 and the outer circumferential surface of the recess 21 due to various usage conditions (see FIG. 4).
Even if such a problem occurs, contact pressure is applied by pressing the left end side 22C of the O-ring 22 against the bottom surface of the recess 21, and the outer peripheral surface 2A of the inner cylinder 2 and the inner peripheral surface 4C of the mounting member 4 are connected. This prevents high pressure from entering between the two.

Thus, in this embodiment configured in this way, it is possible to obtain almost the same effects as in the first embodiment, but in particular, in this embodiment, a gap etc. are generated on the outer peripheral side 22B of the O-ring 22. A reliable sealing effect can be obtained even when

Next, FIG. 5 shows a third embodiment of the present invention, in which the recess 21 and the O-ring 22 described in the second embodiment are
The features of this example are as follows.
In order to reliably apply contact pressure to the inner peripheral side 22A and left end side 22C of the O-ring 22, the backup ring 31 is formed to be tapered.

Here, the backup ring 31 and the cylinder cover 6
A spring 32, which is substantially the same as the spring 23 described in the second embodiment, is disposed between the O-ring 22 and the disc portion 6A, and the spring 32 obliquely presses the O-ring 22 via the backup ring 31. The inner peripheral side 22A and left end side 22C of the O-ring 22 are pressed against the outer peripheral surface 2A of the inner cylinder 2 and the bottom surface of the recess 21, respectively.

Thus, in this embodiment configured in this way, it is possible to obtain almost the same effects as in the second embodiment, but in particular, in this embodiment, the inner peripheral side 22A and the left end side 22C of the The sealing effect can be further enhanced by ensuring contact pressure with the material.

In addition, in the second and third embodiments, the spring 23 (32)
Although it has been described that the spring 23 (32) is formed by a disc spring, instead of this, the spring 23 (32) may be formed by a coil spring or the like. A plurality of them may be arranged.

Furthermore, in each of the above embodiments, the O-ring 12 (22) is inserted between the inner tube 2 and the mounting member 4 on the cylinder cover 6 side of the tube body 1. ,
A similar O-ring 1 is attached to the rod cover side of the tube body 1.
2 (22) may be inserted.

Further, in each of the embodiments described above, the tube for a hydraulic cylinder was explained as an example, but the present invention is not limited thereto, and can be applied to various pressure vessels such as a tube for a pneumatic cylinder.

Further, in each of the above embodiments, the inner tube 2 and the outer tube 3 are formed using means such as filament winding, but instead of this, the inner tube 2 and the outer tube 3 can be formed using tape-shaped fibers. Tape winding method using materials,
It may be formed by means such as a hand lay-up method using a woven fiber material.

〔Effect of the invention〕

As detailed above, according to the present invention, the O-ring is inserted between the outer peripheral side of the axial end of the inner cylinder and the inner peripheral side of the mounting member, so that the cover is protected against the internal pressure of the pressure vessel. Even if the cover is elastically deformed and a gap is formed between the cover and the end face of the inner cylinder, etc., and high pressure is generated within this gap, this high pressure will enter between the inner cylinder and the mounting member, causing damage to both. O to separate
This can be prevented by the ring, and problems such as a decrease in the strength of the composite material pressure vessel can be solved, and the durability against shocking pressure fluctuations, high pressure, etc. can be reliably improved.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a half-sectional view of a tube, FIG. 2 is an enlarged view of the main part in FIG. 1, and FIGS. 3 and 4. indicates the second embodiment, and the third embodiment
The figure is a half-sectional view of the tube, Figure 4 is an enlarged view of the main part in Figure 3, Figure 5 is an enlarged view of the main part similar to Figure 4 showing the third embodiment, and Figures 6 to 8 The figures show the prior art, FIG. 6 is a half-sectional view of the tube, FIG. 7 is a half-sectional view similar to FIG. 6 showing the deformed state of the cylinder cover, and FIG. 8 shows the deformed state of the tube body etc. It is a half sectional view similar to FIG. 6. DESCRIPTION OF SYMBOLS 1...Tube body, 2...Inner cylinder, 2A...Outer circumferential surface, 3...Outer cylinder, 4...Mounting member, 4A...
Projection, 4C... Inner peripheral surface, 6... Cylinder cover, 7
... Bolt, 11.21 ... Recess, 12.22 ...
・0 ring, 23.32... spring, 24.31...
backup ring. Patent applicant Hitachi Construction Machinery Co., Ltd. Agent Patent attorney Kazu Hirose Living room
Nao Nakamura Horizontal tube 1 Figure 2 + 2A Figure 3 6B Figure 4 Figure 5 Figure 6

Claims (2)

[Claims] (1) An inner cylinder and an outer cylinder made of fiber-reinforced resin material, and a metal pipe provided between the inner cylinder and the outer cylinder in order to attach covers to the axial ends of the inner cylinder and the outer cylinder. A pressure vessel made of a composite material comprising a mounting member, characterized in that an O-ring is inserted between the outer peripheral side of the axial end of the inner cylinder and the inner peripheral side of the mounting member. manufactured pressure vessel. (2) The composite material pressure vessel according to claim (1), wherein a spring is disposed between the cover and the O-ring to apply contact pressure to the O-ring.