JPH0697041B2 - Cylinder device manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a hydraulic / pneumatic cylinder device, and more specifically, a cylinder device suitable for being used as an actuator for driving a working machine such as a construction machine. Manufacturing method.

[Conventional technology]

It is generally desired that hydraulic and pneumatic cylinders, which are used as actuators for driving working machines such as construction machines, have a strengthened structure and be quantified. For this reason, for example, Japanese Utility Model Laid-Open Nos. 56-39603, 56-39604, and 56-39.
Hydraulic cylinders and piston rods such as those disclosed in No. 654 have been developed.

These hydraulic cylinders consist of a cylinder tube made of carbon fiber and a cylinder head and cylinder bottom made of a metallic material that are connected to both ends of the cylinder tube. The piston rod is also made of carbon fiber. The rod head and the rod end, which are made of a metallic material, are connected to both ends of the to measure the weight.

[Problems to be solved by the invention]

In the above hydraulic cylinder, even if the cylinder tube is made of carbon fiber, since the cylinder head and the cylinder bottom made of metal material are joined at both ends, the weight becomes heavier and a complicated structure is required at the joint. Therefore, it is difficult to process, and since the joints are made of different materials, the strength is inferior, which causes oil leakage.

Similarly, the piston rod also has a rod head and a rod end made of a metal material at both ends, which makes it difficult to process the piston rod, resulting in an increase in weight and a decrease in strength of the joint portion.

Therefore, an object of the present invention is to provide a method of processing a cylinder device which is easy to process and has a light weight.

[Means for solving problems]

In order to configure the above object, the configuration of the present invention is such that a bearing is provided at one end of a cylinder tube, and a piston rod penetrating the bearing is movably inserted through the piston in the cylinder tube. In a cylinder device in which the piston and the piston are formed of a fiber-reinforced composite material, the cylinder tube holds a head member formed of the fiber-reinforced composite material at one end of the form, and the fibers are formed on the outer periphery of the form frame and the head member. After wrapping the reinforced composite material to a certain thickness, the part corresponding to the vicinity of the other end of the mold is cut in the radial direction, and then the mold material is removed from this cutting point to form the piston rod. Is characterized in that it is formed by winding a fiber-reinforced composite material around the outer periphery of a mold material until it has a constant wall thickness.

〔Example〕

A method for processing a cylinder device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cylinder device manufactured by the method of the present invention.

This cylinder device includes a cylinder tube 2 formed of a fiber-reinforced composite material, for example, carbon fiber, a piston 3 slidably inserted into the cylinder tube 2 and formed of carbon fiber, and a cylinder tube formed of carbon fiber. And a piston rod 5 connected to the piston 3 and penetrating the bearing 4.

A head member 6 is embedded in one end of the cylinder tube 2,
An eye 6a for mounting is formed by penetrating the head member 6 and the cylinder tube 2.

Although the head member 6 is formed of carbon fiber, it may be formed of synthetic resin.

A hollow bearing 4 is fitted into the other end of the cylinder tube 2 via a seal 7, and the bearing 4 and the cylinder tube 2 are connected from a lateral direction by a pin 8 driven or screwed. The bearing 4 is also made of carbon fiber, but may be made of other synthetic resin.

A piston rod 5 is slidably inserted in the center of the bearing 4, and a seal member 9 is interposed between the inner circumference of the bearing 4 and the outer circumference of the piston rod 5.

A seal 10 and a piston ring 11 are provided on the outer circumference of the piston 3, and two pressure chambers 12 and 13 are defined in the cylinder tube 2 via the seal 10 and the piston ring 11.

A plug member 14 is press-fitted into the pressure chamber 13 via a seal 15 on the outer circumference. The plug member 14 and the seal 15 allow the oil in the pressure chamber 13 to enter a gap and an eye between the cylinder tube 2 and the head member 6. It prevents leakage to the outside through 6a.

The material of the plug member 14 is preferably molded of synthetic resin.

The piston rod 5 has reinforcing members 17 and 18 fitted to both ends of the pipe 16, and is composed of the pipe 16 and a carbon fiber portion 19 wrapped around the outer periphery of the reinforcing members 17 and 18. The reinforcing member is provided at one end of the piston rod 5. Mounting member 18a such as a pin that penetrates 18
Is attached to the piston 3 through the, and an attachment eye 17a formed on the reinforcing member 17 is provided at the other end.

The pipe 16 and the reinforcing members 17 and 18 are preferably formed of carbon fiber, but other lightweight and strong materials may be used.

Further, the pipe 16 and the reinforcing member may be integrally formed without using the pipe 16.

The cylinder tube 2 is formed with bulging portions 20 and 21 facing the pressure chambers 12 and 13 for attaching the port member.
The outer surface of 0,21 is molded horizontally and the ports 22,23 are centrally located.
Is being worn.

Port members 24 and 24 having ports are formed on the outer surfaces of the bulging portions 20 and 21.
The inner ends of the contact members abut, and the port members 24, 24
It is connected to the cylinder tube 2 via 5.

The port members 24, 24 are preferably made of metal or synthetic resin. However, as long as a hose or the like can be connected without threading the port, the port may be formed of carbon fiber.

The mounting member 25 is made of carbon fiber. In this case, the port member 24 is brought into contact with the cylinder tube 2, and in that state, the carbon fiber impregnated with the adhesive is sequentially wound.

As the fiber-reinforced composite material, it is preferable to use thin carbon fibers of about 0.7 micron formed into a thread shape as described above, but other similar materials such as glass fiber may be used.

Next, a method of processing the cylinder tube 2 will be described with reference to FIGS.

A head member 6 is held in advance through a boss 27 on the head side, which is one end of a mold member 26 that has been machined into the same shape as the outer shape of the cylinder tube 2, and the outer end of the head member 6 has a hooking member as shown in FIG. 28 is fixed via pin 29,
The receiving member 30 is integrally provided or abutted on the left end of 26, and the hook member 32 shown in FIG.
When the outer end of the cylinder tube 2 has a rounded hook member 28, 32, the hook member 28 of FIG. 5 is used, and the outer end has a rectangular or right-angled surface. It is preferable to use the hook member 32 shown in FIG.

One of the hook members 28 is a disk or an elliptical plate on which gear-shaped or saw-tooth hook pieces 28a are formed along the circumferential direction. The hook members 32 shown in FIG. A plurality of hooking pieces 32a are radially formed on the outer periphery of a shaped substrate.

Further, an auxiliary mold member 33 having a trapezoidal cross section is brought into contact with the outer periphery of the mold member 26 so as to be separable corresponding to the mounting position of the port member of the cylinder tube 2.

Further, preferably, the columnar bodies 34, 35 for port molding are regulated so as to be separable or integrally facing the auxiliary mold material 33.

The head member 6 is provided with an eye 6a.
Although 6a may be formed by post-processing, a cylindrical body for eye forming may be inserted in the head member 6 in the radial direction in advance so that it can be removed.

In the above-mentioned state, carbon fibers impregnated or attached with an adhesive such as an epoxy resin are attached to the outer surfaces of the mold member 26, the hook members 28 and 32, the auxiliary mold member 33 and the outer circumferences of the columns 34 and 35 in the axial direction. , Wrap a lot in the circumferential and diagonal directions. However, a peeling material is attached to the outer surface of the mold material 26 or the like before winding. The number of times of winding is such that the cylinder tube 2 is wound until the required thickness is obtained. When the above-mentioned mold member 26 is used, it can be wound around the outer periphery of the mold member 26 in the circumferential direction and the diagonal direction as much as possible. It is something to wrap around.

When wound in this manner, the cylinder tube 2 along the contours of the mold member 26, the head member 6, the auxiliary mold member 33, and the receiving member 30.
A wall thickness for forming is formed.

Next, from this state, the mold member 26 is radially cut from the vicinity A of the left end.

Next, the mold member 26 is pulled out to the left in the figure through this cutting point.

At this time, the outer shape of the cylinder tube 2 as shown in FIG. 6 remains and the inside becomes hollow. Then, the bearing 4 is fitted through the opening at the left end as shown in FIG.

On the other hand, when the pillars 34, 35 are driven from the radial direction toward the hollow portion, the pillars 34, 35 and the auxiliary mold member 33 come off.

At this time, what is important is that the ports 22 and 23 are formed in the members of the pillars 34 and 35, and the trapezoidal bulging portions 20 and 21 along the outer periphery of the auxiliary mold members 33 and 33 are also formed. Moreover, since the outer surfaces of the bulging portions 20 and 21 are horizontal, they fit the horizontal inner end surface of the metallic port member 24, for example.

Further, the hooking piece 28a of the hooking portion 28 may be exposed to the outside to some extent. In this case, the exposed portion is cut and finishing is performed. However, most of the main body of the hook member 28 is buried and remains in the cylinder tube 2, but this portion can be used to reinforce the cylinder tube 2 on the contrary.

Further, when the carbon fiber is wound around the head member 6 while the cylindrical body for eye molding is inserted, the eye 6a is naturally molded by passing through the cylindrical body. If this cylinder is not used, the eye 6a will be punched later.

Next, a method of forming the piston rod 5 will be described with reference to FIGS.

Fit the reinforcing members 17 and 18 on both ends of the pipe 16
6 and the reinforcing members 17 and 18 form a mold member that follows the outer shape of the piston rod 5. However, such a pipe 16 or the like may not be used, and a rod-shaped mold material that follows the shape of the integrally formed piston rod may be used.

Next, the hook member 28 as shown in FIG. 5 is fixed to the outer ends of the reinforcing members 17 and 18 via the pins 29. In this state, as in cylinder molding, carbon fiber is axially, circumferentially,
The carbon fiber portion 19 having a required thickness is formed by winding in a diagonal direction.

Wrap carbon fiber around the above mold material to the required thickness,
When the hooking piece 28a exposed to the outside by this thickness or more is cut and finished, the piston rod 5 of FIG. 8 is formed.

The eye 17a may be punched later, or a cylindrical material may be inserted into a portion corresponding to the eye 17a in advance and then the cylindrical body may be removed and molded.

By the way, although the bearing 4 in the cylinder 1 of FIG. 1 is fixed to the cylinder tube 2 by the pin 8 or the like, the bearing may be screwed to the cylinder tube 2 in some cases.

However, it is difficult to thread a carbon fiber cylinder tube or bearing.

Therefore, it is necessary to fit a screw member formed of a hard material such as metal or synthetic resin to a part of the inner circumference of the cylinder tube 2.

In this case, as shown in FIG. 9, before winding the carbon fiber, a screw portion 36 made of a hard material is brought into contact with the left side portion of the mold member 26 in FIG. 3 and the screw portion 36 is included. Wrap the carbon fiber. The screw part 36 may be provided separately from the auxiliary mold member 33 shown in FIG. 3, and may be provided in the vicinity of this auxiliary mold member 33. If the auxiliary mold member 33 has a port previously drilled, the auxiliary mold member 33 should be buried and placed there. Moyara, this auxiliary mold material
You may use what was united with the side of 33.

A screw member 37 is fitted into the bearing 4 and the screw member 37
Use a bearing provided at the tip with a stopper 38 to prevent the bearing from coming off.
Screw through.

〔The invention's effect〕

The method for manufacturing a cylinder device according to the present invention has the following effects.

Since the cylinder tube is formed by winding the fiber reinforced composite material around the outer periphery of the mold member and the head member and then removing the mold member, the molding is easy.

Since the cylinder tube, the piston rod, and the piston are integrally formed of a fiber-reinforced composite material, they are lightweight and have high strength.

Since the piston rod is molded only by winding the fiber reinforced composite material around the outer periphery of the mold material, the molding is easy.

Since the cylinder tube and the piston rod are not connected to members made of other materials, connection work becomes unnecessary and a structure that increases the strength of the connection portion is not necessary. Moreover, the structure is simple, the number of parts is small, and the outer shape is smart.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a cylinder device processed according to the present invention, FIG. 2 is a cross-sectional side view taken along the line II-II of FIG. 1, and FIG. 3 is a state in which carbon fiber is wound around a mold material of a cylinder tube. FIG. 4 is a vertical sectional view of a hook member, FIG. 6 is a vertical sectional front view of a molded cylinder tube, and FIG. 7 is a vertical sectional view in which carbon fibers are wound around a piston rod mold material. A front view, FIG. 8 is a vertical sectional front view of a molded piston rod, and FIG. 9 is a partially cutaway vertical front view of a cylinder tube and a bearing according to another embodiment. 2 ... Cylinder tube, 3 ... Piston, 4 ... Bearing, 5 ... Piston rod, 6 ... Head member, 16
…… Molding material pipe, 17,18 …… Molding material reinforcing member, 26
…… Mold material.

Continuation of the front page (56) References JP-A-61-59009 (JP, A) JP-A-61-59010 (JP, A) Actual development Sho-49-122285 (JP, U)

Claims (2)

[Claims] 1. A bearing is provided at one end of a cylinder tube, a piston rod penetrating the bearing is movably inserted into the cylinder tube through the piston, and the cylinder tube, the bearing, the piston rod and the piston are made of a fiber reinforced composite material. In the cylinder device formed by, the cylinder tube holds a head member formed of a fiber-reinforced composite material at one end of the mold, and wraps the fiber-reinforced composite material around the outer circumference of the mold and the head member, After the wall thickness becomes thicker, the part corresponding to the vicinity of the other end of the mold is cut in the radial direction, and then the mold material is removed from this cutting portion to be molded, and the piston rod has a constant thickness on the outer periphery of the mold material. A method for manufacturing a cylinder device, comprising forming a fiber-reinforced composite material by winding the fiber-reinforced composite material to a thickness. 2. The method for manufacturing a cylinder device according to claim 1, wherein the fiber-reinforced composite material is carbon fiber or glass fiber.