JPH0356897B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides fibers suitable for use in hydraulic/pneumatic cylinder rods, robot arms, CFRP truss structures, CFRP shafts, automobile drive shafts, etc. This invention relates to a rod-shaped body made of reinforced resin.

[Prior art]

Generally, a rod-shaped body made of fiber-reinforced resin is known, which is formed into a rod-shape by winding a fiber material impregnated with an adhesive resin. When a rod-like body of this kind is used as a rod for a hydraulic cylinder and is screwed to a mating member, the structure of the rod has conventionally been as shown in FIG. 10 or 11.

That is, in FIG. 10, 1 is a rod, and the rod 1 is formed into a rod shape by winding a filamentous fiber material made of carbon fiber impregnated with epoxy resin, and one side of the rod 1 is a rod. A male threaded portion 1A formed by cutting is integrally provided at the shaft end.

On the other hand, in FIG. 11, 2 is a rod consisting of a rod body 3 and a male threaded member 4, and the rod body 3 is impregnated with an adhesive resin such as epoxy resin, similar to the rod 1 shown in the first prior art. The rod body 3 is formed into a rod shape by winding a filamentous fiber material such as carbon fiber, and an insertion hole 3A is bored in the axial direction at one axial end of the rod body 3. On the other hand, the male threaded member 4 consists of an insertion shaft portion 4A and a male thread portion 4B made of metal material, and by inserting the insertion shaft portion 4A into the insertion hole 3A of the rod body 3 and fixing it with adhesive, The rod body 3 and the male threaded member 4 are connected.

[Problem that the invention seeks to solve]

The first conventional technique, in which the male threaded portion 1A is cut into the rod 1, has the following drawbacks. First, because the filamentous fiber material forming the rod 1 is cut short during the cutting process to form the male threaded portion 1A, the strength of the fiber-reinforced resin, which has great strength in the fiber direction, is partially reduced. This is something that is lost. Second, Rod 1
Since the rod 1 is formed by winding a filamentous fiber material, if the external thread part 1A is formed on the rod 1 by cutting, delamination is likely to occur from the cut part, and the threads will collapse. Furthermore, a third drawback is that the resin and filamentous fiber material forming the male threaded portion 1A are softer than metal, so that, for example, when a metal nut is screwed into the male threaded portion 1A and tightened strongly. , there is a risk that the male threaded portion 1A may be deformed, and strong tightening force cannot be applied.

On the other hand, as shown in FIG. 11, even in other conventional techniques in which the rod body 3 and the male threaded member 4 are inserted and bonded, the rod body 3 is made of fiber-reinforced resin because the shear strength of the bonded portion is low. There is a drawback that the purpose of high strength cannot be achieved by molding with wax.

The present invention was made in view of the drawbacks of the prior art described above, and the present invention is made of a high-strength fiber-reinforced resin that can fully utilize the strength of fiber-reinforced resin and has excellent fatigue resistance, impact resistance, etc. The purpose is to provide a rod-shaped body.

[Means for solving problems]

The present invention for solving the above-mentioned problems has an elongated core material formed of a fiber-reinforced resin material and having a small diameter portion on the shaft end side, and an outer diameter corresponding to the core material, A fitting hole into which the small diameter portion of the core material fits is formed on the proximal end side, a hook portion of a fiber material is provided protrudingly on the outer periphery of the proximal end side, and the distal end side serves as an attachment portion to a mating member. The attached attachment member and the fiber material impregnated with resin are wound from the outer circumferential surface of the core material to the proximal outer circumferential surface of the attaching member while being hooked onto the hook portion of the attaching member and being wound back. A structure consisting of an outer cylinder formed by this is adopted.

Here, carbon fiber, glass fiber, aramid fiber, alumina fiber, silicon carbide fiber, etc. are used as the fiber material, and the resin to be impregnated into the fiber material includes epoxy resin having thermosetting and adhesive properties,
Polyester resin, polyimide resin, etc. are used. The method for winding the fiber material is as follows:
Examples include a filament winding method using a thread-like fiber material, a tape winding method using a tape-like fiber material, and a hand lay-up method using a woven fiber material.

Further, the core material may be formed by winding a resin-impregnated fiber material in the same manner as the outer cylinder, or a unidirectionally drawn material made of fiber-reinforced resin material or the like may be used. Furthermore, the mounting member is formed of, for example, a metal material, a ceramic material, a resin material reinforced with short fibers, or the like.

[Effect]

This is because the fiber material impregnated with resin is hooked onto the hook part of the attachment member and rolled back, thereby forming an outer cylinder by winding it from the outer peripheral surface of the core material to the outer peripheral surface on the proximal side of the attachment member. In this case, the attachment member can be firmly integrated with the outer cylinder and the shaft end side of the core material by fully utilizing the strength of the fiber material without cutting the fiber material in the middle. Furthermore, since the outer diameter of the attachment member corresponds to the outer diameter of the core material, the fiber material can be wound smoothly. Since the small diameter portion of the core member is fitted into the fitting hole of the attachment member, the bending moment acting on the small diameter portion can be reduced, and stress concentration can be prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 9, taking a hydraulic cylinder rod as an example of a fiber-reinforced resin rod.

1 to 4 show a first embodiment of the invention.

In the figure, reference numeral 11 indicates an elongated core material, and the core material 11 is formed into a round rod shape, for example, with a diameter of about 10 mm, by a unidirectionally drawn material made of fiber-reinforced resin material. Both ends of the core material 11 in the axial direction are machined, for example, with a lathe, to a depth of 1 to 1.
Small diameter part 11A as a step part of about 4 mm (however,
The small diameter portion 11A is fitted into a fitting hole 12A of a mounting member 12, which will be described later, and is fixed with an adhesive or the like.

Note that the core material 11 is similar to the outer cylinder 1 described later.
Similarly to 6, it may be formed by impregnating the fiber material with resin and winding it using means such as filament winding.

Reference numeral 12 indicates mounting members (only one of which is shown) that is fitted and fixed to each small diameter portion 11A of the core material 11, and each of the mounting members 12 is made of a metal material, a ceramic material, a resin material reinforced with short fibers, etc. A bottomed fitting hole 12 with a diameter corresponding to the small diameter portion 11A of the core material 11 is formed on the proximal end thereof, and a bottomed fitting hole 12 with a diameter corresponding to the small diameter portion 11A of the core material 11 is formed on the distal end side. A male threaded portion 1 as a mounting portion protrudes in the axial direction from 16.
It has become 2B. And each mounting member 12
The small diameter portion 11A of the core material 11 is fitted into the fitting hole 12A and fixed with adhesive, and the outer circumferential surface of the proximal end of each attachment member 12 and the outer circumferential surface of the core material 11 are substantially They are on the same page. Furthermore, a mating member such as a mounting eye or a piston (none of which is shown) is screwed into the male threaded portion 12B of each mounting member 12.

Reference numerals 13, 13, . With a predetermined interval, for example 10~
There are about 15 protruding pieces in a roughly L-shape. here,
Each of the hook portions 13 includes a radial protrusion 13A that is located approximately corresponding to an axially intermediate portion of the fitting hole 12A, and protrudes radially outward from the proximal outer periphery of the mounting member 12; The protrusion 13A extends from the tip of the protrusion 13A to a predetermined length in the axial direction.
The axially extending portion 13B is formed wider in the circumferential direction than the protruding portion 13A, and slits 14, 14, . . . are interposed between the respective protrusions 13A,
A substantially U-shaped notch 15 is formed between the mounting member 3B and the outer peripheral surface of the mounting member 12. A fiber material 17, which will be described later, is placed inside the notch 15 as shown in FIG.
As shown in FIG. 4, after being introduced through one slit 14, the fiber material 17 is led out in the axial direction through another slit 14.
is hooked onto the protruding portion 13A of each hook portion 13 and wound back.

Reference numeral 16 denotes an outer cylinder formed by winding a filamentous fiber material 17 impregnated with resin over the entire surface from the outer peripheral surface of the core material 11 to the outer peripheral surface on the proximal side of each attachment member 12; 16, the fiber material 17 is wound at a winding angle close to zero degrees with respect to the central axis O-O, for example, at a winding angle θ, using a method such as a filament winding method.
It is formed into a substantially cylindrical shape by one or more winding layers that are cross-wound under tension to a predetermined thickness so that the angle of the winding is 5 to 30 degrees (see Fig. 3). When the fiber material 17 is cross-wound, the fibrous material 17 is wrapped around each mounting member 16 in order to form windings 16A (only one is shown) on both ends of the outer cylinder 16 in the axial direction, as illustrated in FIGS. 3 and 4. is hooked onto one or more hook portions 13 of the
The two are now strongly integrated.

Here, carbon fiber, glass fiber, aramid fiber, alumina fiber, silicon carbide fiber, etc. are used for the fiber material 17, and the resin to be impregnated into the fiber material 17 includes epoxy resin having thermosetting and adhesive properties, Polyester resin, polyimide resin, etc. are used. Thus, the outer cylinder 16 made of the filamentous fiber material 17 impregnated with this resin is formed from the outer circumferential surface of the core material 11 to the proximal outer circumferential surface of each attachment member 12 so as to completely cover them. The inside of the cut portion 15 is completely filled with the fiber material 17. A male threaded portion 12B of each mounting member 12 protrudes coaxially from both ends of the outer cylinder 16 in the axial direction, and the mounting eye, piston, etc. are screwed into each male threaded portion 12B.

The hydraulic cylinder rod according to this embodiment has the above-mentioned structure, and the manufacturing method thereof will be explained next.

First, a core material 11 having an outer diameter of about 10 mm, for example, is prepared. This may be a solid round rod formed from a fiber-reinforced resin material by pultrusion, or may be a small diameter cylinder formed by filament winding or the like. Then, after machining both axial ends of the core material 11 to form small diameter portions 11A, each mounting member 12 is fitted into each small diameter portion 11A through the fitting hole 12A and bonded. It is bonded and fixed by the agent. At this time, the core material 11
By roughening the outer circumferential surface etc. with sandpaper or the like, the adhesion to the outer cylinder 16 can be improved.

Next, once this adhesive has completely cured,
A thread-like fiber material 17 impregnated with resin is wound from the outer circumferential surface of the core material 11 to the proximal outer circumferential surface of each attachment member 12 using a means such as a filament winding method to form an outer cylinder 16. . At this time,
While stretching the fiber material 17 from the outer circumferential surface of the core material 11 to the outer circumferential surface of each attachment member 12 with a predetermined tension, the fiber material 17 is hooked onto the protruding portion 13A side of each hook portion 13, and the core is reattached. The core material 11 is wound back toward the outer circumferential surface side, thereby firmly integrating each attachment member 12 with both ends of the core material 11. Further, by setting the winding angle θ of the fiber material 17 to be close to zero degrees with respect to the central axis O-O, for example, θ = 5 to 30 degrees, the bending strength, tensile strength, etc. can be significantly increased. can. Then, at the stage where the outer cylinder 16 having a predetermined thickness is formed on the outer peripheral surface side of the core material 11 and the attachment member 12, these are placed in a curing furnace, and the resin impregnated into the fiber material 17 is thermally cured. .

Next, the outer circumferential surface of the outer tube 16 is machined using a grinder or the like, and the outer circumference of the end portion of the outer tube 16 is finished to a uniform surface using, for example, sandpaper, so that the outer diameter of the outer tube 16 is adjusted. , for example, 22.4 mm, and the rod is completed.

According to this embodiment, when forming the outer cylinder 16 by winding the thread-like fiber material 17 impregnated with resin around the outer peripheral surface of the core material 11 and each attachment member 12, Since the material 17 is hooked onto the protruding portion 13A of each hook portion 13 and wound back, it is not only possible to cross-wrap the fiber material 17 regularly, but also to By making full use of the strength possessed by the core material 11 and the outer cylinder 16, each mounting member 12 can be firmly integrated on both axial ends of the core material 11 and the outer cylinder 16, and each mounting member 12 can be reliably prevented from slipping out and rotating. be able to.

In addition, since the fiber material 17 is not cut midway and its strength can be fully utilized, fatigue resistance, impact resistance, etc. can be greatly improved, and the fiber material 17 is highly reliable and lightweight. A rod for a hydraulic cylinder can be obtained. In addition to being able to increase the tensile strength, bending strength, etc., it is also possible to calculate the strength of the rod in advance.

Furthermore, fiber-reinforced resin materials can be used for the core material 11 and outer tube 16, which require tensile strength and bending strength, and metal materials can be appropriately selected and used for the mounting member 12, which requires high hardness. The degree of freedom in design is increased and limit design becomes possible.

Since the small diameter portion 11A of the core material 11 is fitted and fixed in the fitting hole 12A of the mounting member 12, not only can the mounting member 12 be reliably positioned, but also the small diameter portion of the core material 11 made of fiber-reinforced resin material can be fixed. The bending moment and the like acting on the portion 11A can be made smaller compared to other portions, and damage to the small diameter portion 11A due to stress concentration can be prevented. Furthermore, since the outer diameter of the base end of the mounting member 12 corresponds to the outer diameter of the core material 11 and the outer circumferential surfaces of both are substantially flush, the fiber material 17 can be smoothly wound around these outer circumferential surfaces to form the outer cylinder 16. This has various effects, such as being able to form the outer cylinder 16 and increasing the strength of the outer cylinder 16.

Next, FIGS. 5 and 6 show a second embodiment of the present invention, and the feature of this embodiment is that each hook protruding from the outer peripheral side of the mounting member is arranged only in the radial protrusion. This is due to the fact that it was formed. In this embodiment, the core material 11 and fiber material 17 described in the first embodiment are used as they are.

In the figure, 21 indicates a mounting member (only one shown) that is fitted and fixed to each small diameter portion 11A of the core material 11,
Each of the mounting members 21 has a fitting hole 2 at the base end, similar to the mounting member 12 described in the first embodiment.
1A has a male threaded part 2 on the tip side as a mounting part.
1B, respectively, and hook portions 22, 22 that protrude only in the radial direction are integrally formed on the outer periphery of the proximal end of each attachment member 21. Each of the hook portions 22 is located approximately corresponding to the axially intermediate portion of the fitting hole 21A, and is arranged at a predetermined interval in the circumferential direction on the outer periphery of the base end side of the attachment member 21, for example.
There are about 10 to 15 protruding pieces. Note that the cross-sectional shape of each hook portion 22 is as illustrated in FIG.
It may be square, triangular, or circular.

23 is a fiber material 17 impregnated with resin as a core material 1
This figure shows an outer cylinder formed by winding from the outer peripheral surface of 1 to the proximal outer peripheral surface of each attachment member 21, and the outer cylinder 23 is similar to the outer cylinder 16 described in the first embodiment. A rolled-up part 23A is provided on both end sides in the axial direction, which is formed in substantially the same way, and is formed by hooking the fiber material 17 onto each hook part 22 and rolling it back, and the wall thickness of each rolled-up part 23A is formed to be approximately equal to the other portions of the outer cylinder 23.

Thus, in this embodiment configured in this way, it is possible to obtain almost the same effects as in the above embodiment, but in particular, in this embodiment, each hook portion 22
Since the mounting member 21 is formed to protrude only in the radial direction, the overall shape of the mounting member 21 can be simplified and material costs can be reduced.

Next, FIGS. 7 to 9 show a third embodiment of the present invention, and the feature of this embodiment is that a male thread 31B is formed on the outer peripheral surface of the small diameter portion 31A of the core material 31, and the mounting member 32 is fitted into the core member 31. Female thread 32 formed in matching hole 32A
_A1 is that an adhesive or the like is applied to the male screw 31B to screw it into place.

Here, the core material 31 is formed in the same manner as the core material 11 described in the first embodiment except for the male thread 31B. The mounting member 32 is formed almost the same as the mounting member 12 described in the first embodiment except for the female thread _32A1 , and has a male thread 32B on the tip side.
However, on the outer circumferential side, there is a hook portion 3 having a substantially L-shape consisting of a radial protruding portion 33A and an axially extending portion 33B.
3, 33, . . . are provided respectively. The outer circumferential surface of the base end side of the mounting member 32 and the outer circumferential surface of the core material 31 are provided with the outer cylinder 16 described in the first embodiment.
An outer tube 34 similar to the above is formed by winding, and on both axial end sides of the outer tube 34 there are rolled up portions 34 formed by hooking the fiber material onto each of the hook portions 33 and then winding it back.
A is provided.

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, the core material 31
A male thread 31B formed in the small diameter portion 31A and a female thread 32 formed in the fitting hole 32A of the mounting member 32.
A ₁ is screw-fitted and fixed with adhesive or the like, so the tensile load applied to the mounting member 32 etc. can be shared not only by the wound part 34A of the outer cylinder 34 but also by this screw-fitting part. , tensile strength, etc. can be further increased.

In addition, also in the second embodiment, a male thread is formed on the outer peripheral surface of the small diameter portion 11A of the core material 11, and the mounting member 2
A female thread may be formed in one of the fitting holes 21A, and the two may be screwed together using an adhesive or the like.

In addition, in each of the above embodiments, the outer cylinders 16, 23, 3
4 etc. are formed using means such as filament winding method, but instead of this, outer cylinders 16, 23, 34 etc. are formed using means such as tape winding method and hand lay-up method. You may.

Further, in each of the above embodiments, the rod for a hydraulic cylinder was explained as an example, but the present invention is not limited to this, but the present invention is applicable to a rod for a pneumatic cylinder, a robot arm, a CFRP truss structure, a CFRP shaft,
It can be applied to various fiber-reinforced resin rod-shaped bodies such as automobile drive shafts.

〔Effect of the invention〕

As detailed above, according to the present invention, the small diameter portion of the core material is fitted into the fitting hole of the attachment member, and the fiber material impregnated with resin is hooked onto the hook portion of the attachment member and then rolled back. Since the outer cylinder is formed in this way, the strength of the fiber material can be utilized to firmly integrate the mounting member into the outer cylinder and the core material, preventing stress from concentrating on the small diameter part of the core material, and improving reliability. can be improved. In addition, since the outer diameter of the mounting member corresponds to the outer diameter of the core material, the fiber material can be smoothly wound from the outer peripheral surface of the core material to the outer peripheral surface of the proximal end of the mounting member, increasing the strength of the outer cylinder. It has various effects, such as being able to.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing one end side of the rod;
Figure 2 is an enlarged sectional view in the direction of the - arrow in Figure 1;
Fig. 3 is an explanatory external view showing the state in which the fiber material is hooked onto the hook part and rolled back, and Fig. 4 is the - in Fig. 3.
5 and 6 show the second embodiment, FIG. 5 is a longitudinal sectional view showing one end of the rod, and FIG.
Figures 7 to 9 are enlarged external views of the main parts of the figure.
Fig. 7 is a longitudinal sectional view showing one end of the rod, Fig. 8 is a longitudinal sectional view of the main part of the core material, Fig. 9 is a longitudinal sectional view of the main part of the mounting member, and Fig. 10 is a longitudinal sectional view of the main part of the mounting member. FIG. 11 is an external view showing one end side of a rod according to the prior art, and FIG. 11 is a longitudinal sectional view showing one end side of a rod according to another prior art technology. 11, 31... Core material, 11A, 31A... Small diameter part, 12, 21, 32... Mounting member, 12A,
21A, 32A...Fitting hole, 12B, 21B, 3
2B...Male thread part, 13, 22, 33...Hook part, 16, 23, 34...Outer cylinder, 16A, 23
A, 34A... Rewinding part, 17... Fiber material, 3
1B...Male thread, 32A ₁ ...Female thread.

Claims (1)

[Scope of Claims] 1. A long core material made of a fiber-reinforced resin material and having a small diameter portion on the axial end side, and an outer diameter corresponding to the core material, and the core material on the proximal end side. A fitting hole is formed into which the small diameter part of the material fits, and a hook part of the fiber material is protruded from the outer periphery of the proximal end, and the distal end is the attachment part to the mating member. An outer surface formed by winding a fiber material impregnated with the core material from the outer circumferential surface of the core material to the proximal outer circumferential surface of the attachment member, hooking it onto the hook part of the attachment member and rewinding it. A rod-shaped body made of fiber-reinforced resin consisting of a cylinder. 2. The fiber-reinforced resin material according to claim 1, wherein the hook portions are provided at predetermined intervals in the circumferential direction of the mounting member and protrude radially outward from the outer periphery of the base end of the mounting member. Rod-shaped body. 3. The hook portion includes a radial protrusion that protrudes radially outward from the outer periphery of the base end of the attachment member, and an axial extension that extends axially from the tip of each protrusion. A rod-shaped body made of fiber-reinforced resin according to claim 1, which comprises a mounting portion. 4. Claim 1, wherein a male thread is formed on the outer peripheral surface of the small diameter portion of the core material, and a female thread is formed in the fitting hole of the mounting member, into which the male thread is fitted.
A rod-shaped body made of fiber-reinforced resin as described in .