JP3516149B2 - Composite packing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention seals an inner surface of a cylinder or the like or an outer surface of a rod or the like having a circular cross section with an annular body fitted in an annular holding groove, and the outer peripheral sliding surface side is tetrafluoro. The present invention relates to a composite packing in which an ethylene (which is called “Teflon” in a registered trademark; the same applies hereinafter) material is formed of a rubber material on the inner peripheral holding groove side.

[0002]

2. Description of the Related Art As shown in FIG. 7 , an annular holding groove 10 is provided.
The inner surface of a cylinder or the like or the outer surface of a rod or the like having a circular cross section with an annular body fitted to 1 is sealed, and the outer sliding surface side is made of tetrafluoroethylene material 102 and the inner holding groove side is made of rubber material 103. There is a composite packing 104 that is constructed. In this composite packing 104, a tetrafluoroethylene material 102, which is a low friction material, is used for a sliding portion to reduce friction, and an adhesive material necessary for sealing is placed in contact with the tetrafluoroethylene material 102 to provide a highly elastic rubber material 103. Is gained by.

As a result, the sliding resistance at the time of operation can be reduced, and the starting resistance hardly changes even during a long rest period. Further, according to the composite packing 104, the stick resistance during operation is reduced. It has features that it does not cause slippage, can be used without lubrication, has a very long life, and can be used with the dimensions of the conventional O-ring holding groove.

[0004]

Although the composite packing 104 composed of the tetrafluoroethylene material 102 and the rubber material 103 has the above-mentioned characteristics, when the packing is mounted in the holding groove 103, Since the allowable elongation is small, the holding groove 101 of the packing is divided, or the packing is shaped such that the packing is stretched only to the tetrafluoroethylene allowable elongation or less when mounted. You can also use a jig to stretch the packing,
Alternatively, a heater for softening tetrafluoroethylene may be used. Therefore, the composite packing 1 including the tetrafluoroethylene material 102 and the rubber material 103
In No. 04, since the structure of the holding groove and the mounting work are more complicated than the packing made of rubber alone, the composite packing 104 has a good packing performance, but the penetration rate is significantly lower than the packing made of rubber alone.

[0005]

In view of the above-mentioned circumstances, the present invention provides an inexpensive packing disassembly groove having a non-disassembly structure.
It is intended to obtain a packing structure for easily mounting the composite packing. The present invention seals the inner surface of a cylinder or the like or the outer surface of a rod or the like having a circular cross section with an annular body that fits in an annular holding groove, and the sliding surface side of the outer periphery is a tetrafluoroethylene slide with a small allowable elongation. It is a composite packing made of a high-elasticity rubber material on the inner circumference of the holding groove side of the moving material, and the same outer circumference where the tetrafluoroethylene sliding material on the outer sliding surface side is cut in several places in the circumferential direction. A composite packing made of a rubber material on the discontinuity portion and the inner peripheral side of the holding groove side, and the tetrafluoroethylene sliding material and the rubber material are integrally bonded so as to come into close contact with the sliding surface. .

Further, the present invention seals the inner surface of a cylinder or the like or the outer surface of a rod or the like having a circular cross section with an annular body fitted in an annular holding groove, and is made of a tetrafluoroethylene material having a small allowable elongation and a high elongation. A composite packing made of elastic rubber material, in which the outer peripheral edge of a corrugated tetrafluoroethylene annular plate is exposed on the sliding surface, and the other parts are formed of rubber material in the same circular cross section. A composite packing in which an ethylene annular plate and a rubber material are integrally bonded so as to come into close contact with the sliding surface is obtained.

[0007]

According to the present invention, the tetrafluoroethylene sliding material on the sliding surface side of the outer circumference is interrupted at several places in the circumferential direction, and the rubber material is interposed at the interrupted portion. Sufficient extension makes it easier to install in a holding groove such as a piston. Further, according to the present invention, since the outer peripheral edge of the corrugated tetrafluoroethylene annular plate is exposed on the sliding surface and the other part is formed of the rubber material in the same circular cross section, the tetrafluoroethylene annular plate is formed. The corrugated part of can be extended together with the rubber material, and can be easily mounted in a holding groove such as a piston.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on a specific embodiment shown in the accompanying drawings. As shown in FIG. 1 to FIG. 3, an inner surface of a cylinder or the like or an outer surface of a rod or the like having a circular cross section is sealed by an annular body fitted in an annular holding groove, and the outer peripheral sliding surface side is tetrafluoroethylene. A composite packing 3 in which the inner peripheral holding groove side of the sliding material 1 is made of a rubber material 2, and the tetrafluoroethylene sliding material 1 on the outer peripheral sliding surface side is cut at several positions in the circumferential direction, The discontinuity portion 4 and the holding groove side of the inner circumference are made of a rubber material 2, and the tetrafluoroethylene sliding material 1 and the rubber material 2 are integrally bonded.

This composite packing 3 is mounted in a holding groove on the outer surface of a rod or the like to seal the inner surface of a cylinder or the like, or mounted in a holding groove on the inner surface of a cylinder or the like to seal the outer surface of a rod or the like. Further, this composite packing is used for reciprocating motion (for spiral motion) or for rotary motion. An example using the tetrafluoroethylene annular plate 21 will be described with reference to FIGS. 4 to 6.

Width L of the tetrafluoroethylene ring plate 21
Is selected to be narrower than the width of the holding groove, and is formed so as to have a radial waveform with respect to the packing shaft 22 on the cross section of the packing shaft 22. The tetrafluoroethylene circular ring plate 21 may be formed by punching a corrugated plate material, or a narrow corrugated plate material may be formed in a circular ring shape later, but in any case, it is radial with respect to the packing shaft 22. Form the waveform of. The outer peripheral edge 23 of the tetrafluoroethylene circular ring plate 21 is exposed to the sliding surface, and the other portion is formed of a rubber material 24.
And are bonded together to form a composite packing 25.

[0011]

[0012]

As described above, the present invention seals the inner surface of a cylinder or the like or the outer surface of a rod or the like, which has a circular cross section, with an annular body fitted in an annular holding groove, and the sliding surface side of the outer periphery. Is a composite packing composed of a tetrafluoroethylene sliding material with a small allowable elongation and a high elasticity rubber material on the inner retaining groove side, and the tetrafluoroethylene sliding material on the outer sliding surface The same outer peripheral surface is cut off at several points in the direction,
Since the composite packing is formed by forming a rubber material on the discontinuity portion and the holding groove side of the inner circumference, and adhering the tetrafluoroethylene sliding material and the rubber material integrally to make a close contact with the sliding surface, the discontinuity occurs. The rubber material of the part stretches sufficiently, and it becomes easy to attach it to the holding groove such as the piston. Also, since the rubber material and tetrafluoroethylene are in intimate contact with the sliding surface at the same time, the friction is small compared to the packing made of only the rubber material, and the friction is small. Since the abrasion powder acts as a lubricant for the rubber material, there is an effect peculiar to the present invention that dynamic friction and biting friction at rest can be reduced as compared with a packing made of only a rubber material.

Further, as described above, the present invention seals the inner surface of a cylinder or the like or the outer surface of a rod or the like having a circular cross section with an annular body fitted in an annular holding groove, and has a small allowable elongation. A composite packing composed of a fluoroethylene material and a highly elastic rubber material, wherein the outer peripheral edge of a corrugated tetrafluoroethylene annular plate is exposed on the sliding surface,
The other parts are made of rubber and have the same circular cross section, and the tetrafluoroethylene annular plate and the rubber material are integrally bonded to each other so that they are in close contact with the sliding surface. The corrugated portion of the ethylene annular plate can be stretched together with the rubber material, and can be easily mounted in a holding groove such as a piston. Further, the present invention is
In the case of the usage example where the outer circumference of the packing such as the spool valve enters the seal section when the outer circumference is open, the entire circumference of the tetrafluoroethylene material does not enter the seal section at the same time and gradually enters from the ridges of the corrugations, so insertion resistance Dispersion is reduced, which makes the valve operation easier with the low friction effect of the tetrafluoroethylene material.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a composite packing of the present invention.

2 is a cross-sectional view of the annular portion of FIG.

FIG. 3 is a perspective view of FIG. 1.

FIG. 4 is a side view of another embodiment of the composite packing of the present invention.

5 is a cross-sectional view of the annular portion of FIG.

FIG. 6 is a perspective view of FIG. 4.

FIG. 7 is a vertical cross-sectional view of a main part of a conventional composite packing.

[Explanation of symbols]

1. Tetrafluoroethylene sliding material 2 ... rubber material 3 ... Composite packing 4 ... Break 21 ... Tetrafluoroethylene ring plate 22 ... Packing shaft 23 ... Outer periphery 24 ... Rubber material 25 ... Composite packing

   ─────────────────────────────────────────────────── ─── Continued front page       (56) References JP 58-163867 (JP, A)                 Actual Development Sho 60-112752 (JP, U)                 Actual Kaihei 2-65762 (JP, U)                 Actual Development Sho 53-10055 (JP, U)

Claims (2)

(57) [Claims] 1. Tetrafluoroethylene having a circular cross-section with an annular body fitted in an annular holding groove for sealing the inner surface of a cylinder or the like or the outer surface of a rod or the like, and the outer peripheral sliding surface side having a small allowable elongation. It is a composite packing made of a high elasticity rubber material on the inner peripheral holding groove side of the sliding material, and the same tetrafluoroethylene sliding material on the outer peripheral sliding surface side is cut in several places in the circumferential direction. A composite packing which has an outer peripheral surface, and the holding groove side of the discontinuity and the inner periphery is made of a rubber material, and the tetrafluoroethylene sliding material and the rubber material are integrally bonded so as to be in close contact with the sliding surface. 2. A tetrafluoroethylene material having a small allowable elongation and a highly elastic rubber material which seals the inner surface of a cylinder or the like or the outer surface of a rod or the like having a circular cross section with an annular body fitted in an annular holding groove. A composite packing composed of a corrugated tetrafluoroethylene annular plate, the outer peripheral edge of which is exposed on the sliding surface, and the other portion is formed of a rubber material with the same circular cross section. A composite packing in which the rubber material and the rubber material are integrally bonded so that they are in close contact with the sliding surface.