JPS62278374A - Cylinder device - Google Patents

Abstract

PURPOSE:To enhance the heat resistance, fatigue resistance and wear resistance of a cylinder device, by winding a fiber material impregnated therein with resin, around at least one end part of a tube into which is a piston is fitted, in order to form a coupling part, and by jointing the cylinder cover with the tube through the intermediary of the coupling part. CONSTITUTION:A cylindrical tube 11 is formed of metal materials or composite materials, and each end of this tube 11 is covered with a cylinder cover formed of a head cover 13 and a rod cover. Further, a piston integrally incorporated with the a piston rod 12 is stored slidably in the tube 11 to constitute a cylinder device. Further., in such a device, a joint section 14 is formed in at least one end part of the tube 11, by winding a thread like fiber material 16 impregnated with resin such as thermohardenable resin on the tube 11, to form a coupling section 14 through which the cylinder cover 13 is jointed. Further, thread-like material 16 should be wound at a constant winding angle about 190deg. with the use of a filament winding method.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a cylinder device used as a hydraulic cylinder or a pneumatic cylinder, and particularly relates to a cylinder device that is suitable for durability, weather resistance, weight reduction, etc. The present invention relates to a cylinder device suitable for use in required fields.

[Prior art]

Conventionally, cylinder devices used as hydraulic cylinders and pneumatic cylinders include a cylindrical tube made of a metal material and a head cover that is made of a metal material and is closed by fixing both ends of the tube by welding means. a cylinder cover consisting of a rod cover, a mouth, and a rod cover; a piston that is slidably provided within the tube and defines the interior into two chambers; one end is fixed to the piston and the other end protrudes outside the rod cover. The piston is composed of a piston rod, and the piston is stroked by supplying and discharging fluid to each chamber, and at this time, the high-pressure side indoor pressure is received by the cylinder cover.

As such conventional cylinder devices, those shown in FIGS. 6 and 7 are known.

In the figure, l is a tube made of metal such as iron, and both ends of the tube l are covered with metal head covers 2 and rod covers 3, respectively. Supply/discharge port 4.5
is formed.

6 is a piston slidably inserted into the tube 1;
The interior of the tube 1 is defined by the piston 6 into two chambers A and H. 7 is a piston rod, one end of the piston rod 7 is fixed to the piston 6, and the other end projects outside from the rod cover 3. In the figure, 8 is a welding part where the tube l and the head cover 2 are welded, and 9 is a welding part where the tube l and the head cover 2 are welded. The welding part where the tube 1 and the rod cover 3 are welded is shown.

When fluid is supplied to one of the supply and discharge ports 4 and 5, chamber A (IliI) becomes high pressure and the piston 6 is displaced to the left in the figure, and the fluid in chamber B is supplied and discharged. It is discharged from the port 5. Conversely, when fluid is supplied to the supply/discharge port 5, the piston 6 is displaced to the right in the figure.

[Problem that the invention seeks to solve]

In this way, when fluid is supplied to chamber A or B, the pressure in the high-pressure chamber is determined by the load, and this pressure also acts on the head cover 2 and rod cover 3 as a reaction force. For this reason, the tube 1, head cover 2, and rod cover 3 are welded together by welding portions 8 and 9, respectively.

However, in addition to the above-mentioned hydraulic reaction force, the welded parts 8 and 9 are affected by surge pressure when the piston 6 moves rapidly, or impact force when the piston 6 directly collides with the hend cover 2 and rod cover 3. Furthermore, it must be able to withstand these slight rebound loads. However, since the welded parts 8 and 9 are simply joined by molten metal, they are inferior in impact resistance and fatigue resistance. Also, the welded portion 8.
No. 9 is a bonding method that tends to cause stress corrosion cracking and the like because it has poor weather resistance against changes in temperature and humidity.

Therefore, if we consider the case where welding and bolting are used instead of the above-mentioned welding, the thickness of the tube 1 must be increased in order to provide the bolt holes, which increases the weight. To reduce this weight, both ends of the tube are machined and
Flanges must be formed at both ends, which not only increases the number of processing steps but also wastes material.

The present invention was made in view of the above-mentioned drawbacks of the prior art, and it provides impact resistance, weather resistance, and
#An object of the present invention is to provide a cylinder device that has excellent fatigue resistance and is lightweight.

[Means for solving problems]

In order to solve the above problems, one feature of the configuration adopted by the present invention is that the tube serving as the main body of the cylinder is formed of a metal material or a composite material, and at least one end of the tube is impregnated with a resin. A joining part is formed by winding the fiber material, and a cylinder cover facing the joining part is joined via the joining part.

Here, specific examples of materials from which the tube should be formed include:
In addition to iron-based fully flexural materials similar to those made in the prior art, resins such as those used in the present invention can be used on the outer periphery of cylindrical composite materials made of 1A fiber-reinforced resin, and cylindrical metal materials such as iron, aluminum, and copper. A composite material made by winding a fiber material impregnated with the resin, and a composite material made by winding a fiber material impregnated with the resin around the outer periphery of a cylindrical body made of an inorganic material such as a ceramic material or a high-performance resin material. etc.

On the other hand, specific examples of Fam materials impregnated with resin include:
Examples include thread-like fiber materials wound by a filament winding method, and tape-like or woven fiber materials wound by a tape winding method.

〔Example〕

Hereinafter, a case in which a tube and a helical tube are joined will be described in detail with reference to FIGS. 1 to 5 as an example.

1 to 4 show a first embodiment of the invention.

In the figure, numeral 11 is a cylindrical tube used in this embodiment, and since the tube 11 does not require welding as in the prior art, it is of course possible to use an iron-based metal material. However, in addition to this, the outer periphery of a cylindrical composite material made of #am reinforced resin, a cylindrical metal material such as iron, aluminum, copper, etc., was impregnated with a resin as described below, similar to that used in this example. Composite material made by winding m-fiber material,
Furthermore, it is possible to use a composite material made by winding a fiber material impregnated with the above resin around the outer periphery of a cylindrical body made of an inorganic material such as a ceramic material or a high-performance resin material. It is sufficient as long as it has the required strength in the direction.

Reference numeral 12 indicates a piston rod, one end of which is fixed to a piston (not shown) slidably provided within the tube 11, and the other end protrudes outside the rod cover (not shown). .

13 is a head cover used in this embodiment, and a flange portion 13A is integrally formed on the left end side of the head cover 13 in the figure, and a plurality of bolt holes 13 are formed in the flange portion 13A.
B is pierced and sunk in the other direction. Here, the head cover 13 can be made of the above-mentioned composite materials in addition to iron-based metal materials, as in the case of the tube 11 described above, as long as it has the required strength mainly in the axial direction.

Reference numeral 14 indicates a joint formed on the outer circumferential surface of the tube 11 located at the opposite end of the tube 11, and the joint 14 is made of a thread-like u&male material 16 impregnated with a thermosetting resin 15. is wound in a fixed direction to a predetermined thickness using a filament winding method with a constant winding angle θ close to 90 degrees (see Figure 3), and then thermally hardened to form a flange shape. hole 13
A bottomed bolt hole 14A is bored at a position corresponding to B.

Here, as the filamentous fiber material 16 constituting the joint portion 14, for example, carbon fiber, aramid 171 fiber, glass fiber,
Ceramic fibers C5IC, A or 203 fibers (m), etc. are used. Moreover, the filamentous ta! As the thermosetting resin impregnated into the a material 16, those having excellent thermosetting properties and adhesive properties, such as polyimide resin, epoxy resin, polyester resin, etc., are used. Furthermore, the winding angle θ with respect to the axis
The best angle is 90 degrees, and this is to prevent shear separation on the adhesive surface 14B side with the tube 11 and shear 21Im on the bolt joint surface 14C side. If the winding angle θ is close to 0 degrees, each surface 14B.

When a shearing force is applied near 14c, the filamentous fiber material 16
Separation forces between the living rooms are likely to occur. For this reason, a predetermined angle 1 in the range of 60 to 90 degrees, for example 0=70 degrees, is usually selected as the first winding angle θ.

Furthermore, 17.17. . . . indicates a bolt that joins the tube 11 and the head cover 13, and the port 17 joins the two by screwing into each bolt hole 13B, 14A from the head cover 13 side.

The present embodiment is constructed as described above, but in order to manufacture the joint 14, the thread-like fiber material 16 impregnated with the thermosetting resin 15 is wound in a fixed direction at a predetermined winding angle θ by a filament winding method. and finish it to the required thickness.

Next, in order to heat-cure this joint part 14 and fix it to the tube 11, it is placed in a heat-curing oven together with the tube 11,
The impregnated resin 15 is thermoset. After that, the bolt holes 14A may be drilled.

Furthermore, the assembly of the piston and piston rod 12 is inserted into the tube 11 in which the joint part 14 is integrated in this way, the head cover 13 is joined via the port 17, and the Rondo force par is attached. .

In this way, in the cylinder device according to this embodiment,
The joint part 14 is formed using a filamentous fiber material 16 impregnated with a thermosetting resin 15, and is joined to the hend cover 13 via a bolt 17, compared to the conventional technology in which the joint is joined by welding. As a result, it is possible to create a joint portion that has excellent shock absorption properties, fatigue resistance, and excellent weatherability, and is free from stress corrosion cracking. In addition, since the tube 11 only needs to have the minimum necessary thickness, the weight of the cylinder device as a whole can be reduced, and there is no risk of one-shot destruction unlike when using welding means or metal materials, and an excellent joint area can be achieved. It is suitable for use in construction machinery, etc., which must be handled relatively roughly.

In addition, filamentous ta! When winding the a material 16, it is not limited to unidirectional winding as shown in FIG. 3, but may be cross-wound as shown in FIG. 4. In this case, the cross winding may be performed by selecting a winding angle of ±θ with respect to the axis, and a constant winding angle close to 90 degrees is adopted as the winding angle ±θ.

Next, FIG. 5 shows a second embodiment of the present invention, and the feature of this embodiment is that a joint is also provided on the head cover side and is connected to the joint on the tube side with a through bolt. .

That is, a joint 22 having a bolt hole 22A is provided on the outer periphery of the end of the tube 21 on the head force 8-side, and another joint 24 having a bolt hole 24A is provided on the outer periphery of the end of the head cover 23 on the opening side. A through bolt 25 is inserted through the bolt holes 22A, 24A of each of these joint parts 22, 24, and the two are integrally bolted together via a nut 26.

Here, each of the joint parts 22 and 24 is formed into a flange shape by winding a filamentous fiber material impregnated with resin at a certain winding angle and then thermosetting it, similar to the joint part 14 in the first embodiment. The material, manufacturing method, etc. are the same as in the first embodiment.

Although the present embodiment is configured as described above, the bend cover 23
By providing the joint portion 24 on the side as well, mFf is reduced compared to the case where the flange portion 13A is formed as in the first embodiment.
lx can be reduced and machining becomes easier.

Each embodiment of the present invention is as described above, and in the embodiment, the joint portion 14 (2) is provided on the head cover side of the tube 11 (21).
2), however, a joint similar to that of each embodiment may also be provided on the rod cover side.

Furthermore, although the filament winding method was used as an example of the method for forming the joint portion 14 in the embodiment, a tape winding method may also be used. In this case, instead of the thread-like m-fiber material, a tape-like or woven fabric-like Rm material impregnated with resin may be wound.

〔Effect of the invention〕

The cylinder device according to the present invention is as described in detail above, and has a structure in which a joint is provided by winding a resin-impregnated fiber material around at least one end of the tube constituting the cylinder body. , it is possible to obtain a joint portion that is excellent in shock absorption, fatigue resistance, and weather resistance. Furthermore, compared to those using metal materials, there is no risk of one-shot destruction, and the weight can be significantly reduced. Furthermore, by setting the winding angle of the fiber material to a predetermined angle close to 90 degrees, there is no risk of shear peeling at the adhesive or joint surfaces, and it is possible to manufacture joints with even higher strength. be effective.

[Brief explanation of the drawing]

1 to 4 relate to a first embodiment of the present invention, in which FIG. 1 is an external view of main parts of a cylinder device according to this embodiment, and
The figure is an enlarged vertical cross-sectional view of the main part in Figure 1, Figure 3 is an explanatory diagram showing the winding method and winding angle of the fiber material, and Figure 4 is an explanation showing another winding method and winding angle of the textile material. Fig. 5 shows a second embodiment of the present invention, and Figs. A vertical cross-sectional view of the cylinder device, FIG.
FIG. 2 is an enlarged vertical cross-sectional view of the main part in the figure. 11.21...Tube, 12...Piston rod, 13.23...Head cover, 14,22゜24.
...Joint portion, 15...Thermosetting resin, 16...Filamentous fiber material, 17.25...Bolt, 26...S, T. Patent applicant: Hitachi Construction Machinery Co., Ltd. Patent attorney Kazuhiko Hirose Naoki Nakamura Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 7

Claims (3)

[Claims] (1) A cylinder cover consisting of a cylindrical tube, a head cover and a rod cover that cover both ends of the tube, a piston slidably provided in the tube, one end fixed to the piston, and the other end fixed to the piston. In a cylinder device comprising a piston rod whose end protrudes outside the rod cover, the tube is formed of a metal material or a composite material, and at least one end of the tube is wrapped with a fiber material impregnated with resin. A cylinder device characterized in that a joint is formed by rotating the cylinder, and a cylinder cover facing the joint is joined via the joint. (2) The cylinder device according to claim (1), wherein the winding angle of the fiber material is close to 90 degrees. (3) The joint part and the cylinder cover facing the joint part are joined by bolt means (
The cylinder device described in item 1).