JPH049126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to parts convenient for forming a sealing device and the shape of a mold, and more specifically to the shape of a reinforcing ring and the shape of a mold constituting a sealing device.

A detailed description will be given below with reference to the drawings.

Generally, the sealing device A is formed by integrally bonding an elastic ring 1 forming a seal lip and a reinforcing ring 2 reinforcing the elastic ring 1, as shown in FIG. The outside is sealed.

Conventionally, to form this sealing device A, a reinforcing ring 2 was obtained by forming a metal plate into an annular shape, and an elastic material was baked onto the reinforcing ring 2 to integrally mold the reinforcing ring 2.

The reinforcing ring 2 used here does not have sufficient strength with the flat plate ring 2a shape as shown in Fig. 2A, so in order to increase the reinforcing rigidity, the reinforcing ring 2 has a cross-sectional shape of L shown in Fig. 2B. It was formed into a ring 2b shape, a ring 2c shape in Figure 2c, etc. However, other than the flat plate ring 2a, which has low rigidity, the shapes of the front and back sides are different, which has the disadvantage of significantly reducing workability, such as limiting the direction of inserting the mold in the molding process. Since the ring 2a does not provide sufficient retention of the inner and outer diameter dimensions, the precision of attachment to the mold cavity is not satisfactory, and misalignment and eccentricity occur, making it impossible to obtain a high-quality sealing device. It was hot.

The present invention eliminates many of these drawbacks and provides a sealing device molding structure that is compact, has strong rigidity, and greatly improves the workability of insertion into a mold and the precision of the product.

As shown in FIG. 5, the present invention provides a reinforcing ring 3 made of metal or synthetic resin having sufficient strength.
The sealing device A is a sealing device A in which an elastic ring 1 made of an elastic body such as synthetic rubber or synthetic resin is integrally assembled and installed between two mutually rotating members to seal the inside and outside of the two members. As shown in FIG. 3, a stepped convex portion 4 is provided on the outer circumferential side, inner circumferential side, or both sides of the reinforcing ring 3, and the front and back are symmetrical, and the sealing device A is formed as shown in FIG. When the reinforcing ring 3 is inserted into the mold B, at least one side of the inclined stepped part 5 of the convex part 4 comes into contact with a shoulder part 6 provided in the cavity of the mold B. There is.

In this structure, as shown in Fig. 4, a thin flat plate is drawn and bent to form a reinforcing ring 3' that is almost symmetrical on both sides.
The aperture shape is not limited to just a round shape, but may be selected depending on the required shape and strength, such as a △ shape or a □ shape.

With this structure, excellent effects were obtained.

That is, as shown in FIG. 5, in order to form the sealing device A, a previously formed reinforcing ring 3 is inserted into the mold B cavity, and then an elastic material is filled and cured to be integrally molded. This is the generally used forming method, and in this case, the reinforcing ring 3
Although the protruding portion 4 that protrudes when the device is attached has a symmetrical cross-sectional shape, it can be mechanically and continuously attached regardless of the attachment direction. Furthermore, the reinforcing ring 3 to be attached is formed in such a manner that a shoulder portion 6 carved into the mold B cavity contacts the inclined stepped portion 5 of the convex ring 4. It is mounted and fixed using the shoulder portion 6 as a fulcrum. At this time, it is desirable that the surface of the stepped portion 5 of the convex ring 4 be an inclined surface having an appropriate angle that does not reach a right angle to the main body of the reinforcing ring 3. This is different from the conventional mounting structure in which insertion accuracy is obtained by surface contact or edge contact, which greatly depends on the precision of the part when installing the inserted part. 5 is improved so that it makes point or linear contact with the reinforcing ring 3, and is installed to be accurately concentric with the mold B cavity without being affected by the dimensional accuracy of the reinforcing ring 3, such as the outer and inner diameter dimensions or thickness dimensions. This made it possible. In other words, since the reinforcing ring 3 supported by a point or line on an inclined surface has extremely high centripetal property, the reinforcing ring 3 moves on the inclined surface and adjusts its position spontaneously, and even then the attachment occurs. In case of misalignment, the position can be easily corrected by applying slight vibration to the reinforcing ring 3.

A simple method for forming this reinforcing ring 3 from a metal plate, for example, is to form it by coining the metal plate using a press die for small and medium-sized parts, and by bending or drawing it for large parts. Can be easily formed.

In addition, in the mold B shown in FIG. 5, an upper mold B1 and a lower mold B have vertically symmetrical cavity shapes.
2 and the inclined stepped portions 5 on both sides of the reinforcing ring 3.
We hoped to have the effect of accurately fixing the molds by firmly sandwiching them between the shoulders 6 of the upper and lower molds B from both sides. There is no problem in performing the function of the present invention even if the mold is made up of parts, and there are various methods for supplying the elastic material such as injection method or compression method. It is not something to choose.

As explained above, the present invention is an ideal sealing device that greatly improves the molding accuracy and molding workability of the sealing device, and reduces molding defects.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a state in which a conventional sealing device is installed. FIG. 2 is a sectional view showing a reinforcing ring inserted into a conventional sealing device. FIG. 3 is a sectional view of a reinforcing ring used in the sealing device of the present invention. Fourth
This figure is a sectional view showing another embodiment of the reinforcing ring of the present invention shown in FIG. 3. FIG. 5 is a sectional view showing the sealing device of the present invention and a mold for forming the sealing device. A... Sealing device, B... Mold, 1... Elastic ring,
2... Reinforcement ring, 3... Reinforcement ring, 4... Convex portion 4,
5... Slanted stepped part, 6... Shoulder part.

Claims (1)

[Claims] 1. An elastic ring made of an elastic body such as synthetic rubber or synthetic resin is integrally combined with a reinforcing ring made of metal or a synthetic resin having sufficient strength, and the two members are attached between two members that rotate with each other. In the sealing device for sealing the inside and outside of the reinforcing ring, a symmetrical stepped protrusion is provided on the outer periphery side, the inner periphery side, or both sides of the reinforcing ring, and the reinforcing ring is provided with a stepped protrusion portion that is symmetrical with respect to the front and back, and is applied to the mold forming the sealing device. A sealing device molding structure characterized in that when a reinforcing ring is inserted, at least one side of the inclined stepped portion of the protrusion comes into contact with a shoulder provided in the mold cavity.