JPS6026006B2 - Oil seal manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil seal and a method for manufacturing the same, and more particularly, it provides an oil seal with high corrosion resistance and a method for manufacturing the same.

Oil seals used in mechanical devices that handle chemical liquids, etc. have a structure in which a reinforcing ring made of a metal material is completely embedded in a rubber-like elastic material part to ensure corrosion resistance. However, due to manufacturing problems, it is extremely difficult to completely cover the entire surface of the reinforcing ring with the rubber material, and it is common practice to leave at least a portion exposed.

As illustrated in FIG.
In order to be stably supported within the mold without moving in either the axial or radial direction,
The support protrusions 23 arranged appropriately in the circumferential direction and provided on the surface of the mold 21 contact the surface of the metal reinforcing ring 1, so that, as shown in FIG. This is because the reinforcing ring is exposed or covered with an extremely thin rubber coating, and when such an oil seal is attached to a mechanical pupil, the support protrusion contact portion 1
In step 2, the chemical solution to be handled comes into contact with the surface of the reinforcing ring, and the reinforcing ring may be eroded and dissolved. In view of the drawbacks of the prior art described above, the present invention provides an annular molding made of a synthetic resin material without providing a support protrusion for supporting the reinforcing ring when press-molding a rubber material part. Supporting the reinforcing ring with a covering member, molding the rubber material spread over the reinforcing ring, so that the sealing member made of the rubber material and the covering member made of the synthetic resin material work together to cover the entire surface of the reinforcing ring, The purpose is to ensure that the surface of the reinforcing ring is sufficiently protected from corrosion by the chemical liquid to be handled when it is attached to a mechanical device.

Embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 3, the outer folding direction surface 2 and the inner circumferential surface 3 of the folding direction part of the reinforcing ring 1 having an L-shaped cross-section are made of a synthetic resin material having an L-shaped cross-section. The reinforcing ring is covered by an axial part 17 extending from the inner end of the radial part 16 and the radial part 16 of the covering member 15, and the other part of the reinforcing ring has a seal lip 13 and an outer peripheral iron joint part 14. It has a structure covered by a sealing member 11 made of a rubber-like elastic material, and is manufactured by the method shown in FIGS. 4 and 5. In other words, as shown in Figure 4,
The covering member 15 made of synthetic resin and the reinforcing ring 1, which are molded into an L-shaped cross section, are assembled together in advance, and the covering member 15 and the reinforcing ring 1 are attached to the lower mold 22 constituting the mold 21 in the same manner as the lower mold 22. Use the podium to maintain the core condition, and then seal member 1
The rubber-like elastic material piece 18 forming the reinforcing ring 1 is soldered, and the upper mold 23 is further stacked on top of the rubber-like elastic material piece 18, and the upper die 23 is further stacked and pressure-molded until the state shown in FIG. 11 and covering member 15. In another embodiment shown in FIG.
A part of the covering member 15 has a radial direction part 16 and a diameter direction part 1.
The outer ends of the outer ends of the bag 6 are covered by the extending outer edges 17, and during molding, the outer circumferential surface of the bag-oriented section 17 of the covering section 15 is supported by the circumferential surface of the mold and is concentrically formed. Gender is preserved.

In another embodiment shown in FIG. 7, the inner radial surface 5 and the inner axial circumferential surface 6 of the reinforcing ring 1 are axially extending from the outer ends of the strain direction section 16 and the fold direction section of the sheathing section 15. Mankobu 1
7, and the molding is carried out using a mold whose vertical direction is reversed compared to the embodiments shown in FIGS. The peripheral surface is supported to maintain concentricity with the mold. Since the oil seal and the method for manufacturing the same of the present invention have the above-described structural requirements, it is expected that the following effects will be brought about. A reinforcing ring 1 made of a metal material includes a sealing member 11 made of a rubber-like elastic material and a covering member 1 made of a synthetic resin material.
5, and the contact areas of the sealing member 11 and the covering member 15 are welded to each other during pressure molding, so even when used in machinery that handles corrosive substances, the reinforcing ring can be used easily. It is not eroded and can maintain normal function for a long period of time. In addition, due to the rigidity of the synthetic resin material used for the covering member, the covering member and reinforcing ring can maintain a concentric state with the lower mold during the molding process, and the seal lip portion of the oil seal and the outer peripheral iron joint portion can be kept in a concentric state. The concentricity of is guaranteed.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the state of forming an oil seal according to the prior art, Fig. 2 is a sectional view of an oil seal manufactured by the method shown in Fig. 1, and Fig. 3 is an oil seal of the present invention. FIG. 4 and FIG. 5 are cross-sectional views showing the molding state of the embodiment shown in FIG. 3, and FIG. 6 and FIG. FIG. 1... Reinforcement ring, 2... Outer folding direction surface,
3... Inner circumferential surface, 4... Outer axial circumferential surface, 5... Inner radial surface, 6... Inner axial circumferential surface, 11... ...Seal member, 12...
Support protrusion contact portion, 13... Seal lip, 14
...Outer corps, 15... Covered village, 16...
..... axial direction part, 17..... axial direction part, 18.
... Rubber-like elastic material piece, 21 ... Molding mold, 22 ... Lower mold, 23 ... Support protrusion,
24... Upper mold. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 5 Figure 7

Claims (1)

[Claims] 1. A step of fitting a covering member 15 made of a synthetic resin material into a reinforcing ring 1 made of a metal material, inserting the reinforcing ring 1 and the covering member 15 into a mold 21, and fitting the covering member 15 into the mold 21. a step of placing a piece of rubber-like elastic material on the reinforcing ring 1; and a step of pressurizing the piece of rubber-like elastic material with a mold 21 to form a seal portion 11.