JPS6235982Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing device that performs a seal between a relatively rotating wall and a shaft passing through the wall, and in particular, the sealing device is press-fitted into the wall through an elastic member. The present invention relates to a sealing device that is fixed by

Generally, there are many structures in which a rotating shaft penetrates and protrudes from a box that requires airtightness. For example, in an F-F (front engine, front drive) type vehicle, a control rod that is linked to a control lever such as a shift lever protrudes through the transmission housing. By operating the control rod, the control rod rotates and slides, thereby changing the speed of the transmission. Therefore, a sealing device is provided at the portion where the control rod passes through the housing to maintain a sealing function within the housing. It is also used to seal axle bearings.

By the way, as a conventional sealing device, there is one shown in Japanese Patent Publication No. 56-31447, for example.
This sealing device has an elastic member fixed to the outer periphery of a cylindrical portion formed on a reinforcing ring that is the aggregate of this sealing device, and the tube is inserted into a fitting hole formed in a wall body fixing the sealing device via this elastic member. The shaped part is press-fitted. In this way, press-fit type sealing devices generally apply oil to the inner periphery of the fitting hole to aid the press-fitting of the elastic member, but this applied oil is scraped off at the insertion end of the elastic member. As a result, oil runs out, and the elastic member is deformed in a direction opposite to the insertion direction due to the frictional force between the elastic member and the fitting hole, and the reaction of this deformation force causes the sealing device that has been press-fitted to be moved in the returning direction. Therefore, by forming a plurality of annular grooves on the outer periphery of the elastic member as in the conventional sealing device mentioned in the above publication number, the amount of deformation of the elastic member can be tolerated in this annular portion.

However, when a plurality of annular grooves are formed on the outer periphery of an elastic member in this way, the spring constant of the outer periphery becomes low. (the part that has a larger diameter than the fitting hole) needs to be made larger. Further, this press-fitting increased portion is necessary to increase the contact area with the fitting hole after press-fitting.

However, if the press-fitting allowance is increased in this way, the amount of elastic member used increases, which goes against the resource saving that has been particularly desired in recent years.At the same time, when the press-fitting is completed, the annular groove is filled with the increased press-fitting allowance, and the annular groove is There is a possibility that the effect of forming the grooves will be significantly reduced.

In view of the conventional situation, the present invention forms the press-fitting surface of the elastic member flat, and stores lubricant in advance at the end of the elastic member in the insertion direction, so that the elastic member deforms during press-fitting. As the lubricant oozes out to the press-fitting surface, the lubricant is supplied to the following press-fitting surface, reducing the frictional force during press-fitting, and allowing smooth press-fitting without causing reaction due to deformation of the elastic member. The purpose of the present invention is to provide a sealing device that has the following characteristics.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

That is, FIG. 1 shows a sealing device 1 showing one embodiment of the present invention, which includes a reinforcing ring 3 fitted to the outer periphery of a shaft body 2, and this reinforcing ring 3 serves as the aggregate of the sealing device 1. . This reinforcing ring 3 is formed into an L-shaped cross section by an inner bracket 5, which has a sealing body 4 slidably and closely attached to the outer periphery of the shaft body 2 fixed by vulcanization adhesive, etc., a cylindrical part 6a, and a flange part 6b. The inner and outer brackets 5 and 6 are fluid-tightly fixed and integrated by press-fitting or the like. The outer diameter of the cylindrical portion 6a is smaller than the inner diameter of a press-fitting hole 8 formed in the wall body 7. An annularly formed elastic member 9 made of rubber or the like is fixed to the outer circumferential surface of the cylindrical portion 8 by vulcanization adhesive or the like, and the cylindrical portion 6
a is press-fitted into the fitting hole 8. Therefore, the outer peripheral surface of the elastic member 9 is the press-fit surface 9.
a, and this press-fitting surface 9a is formed flat.

Here, in the present invention, an annular recess 10 is formed in the press-fitting surface 9a at the end (right side in the figure) of the elastic member 9 in the insertion direction into the fitting hole 8, and the inside of this recess 10 is lubricated in advance before press-fitting. It is filled with oil 11 as a reagent. By using wax-like oil 11, the recess 10 can be kept filled.

With the above configuration, when fixing the sealing device 1 to the wall 7, the elastic member 9 is press-fitted into the fitting hole 8. At this time, as shown in FIG. When the right end is press-fitted into the fitting hole 8, the recess 10 collapses and the filled oil 11 oozes out onto the press-fitting surface 9a. Then, as the elastic member 9 is inserted, this oil 11 is supplied from the recess 10 to the subsequent press-fitting surface 9a, and the elastic member 9 is press-fitted while significantly reducing the frictional resistance between the fitting hole 8. At this time, since the supply source of the oil 11, that is, the recess 10, is located at the leading end in the insertion direction, the oil 11 can be supplied to the press-fitting surface 9a without running out of oil. Therefore, when the elastic member 9 is press-fitted, the reaction force at the time of deformation can be removed by reducing the frictional force, and as shown in FIG. Also, the sealing device 1 is securely installed without moving in the direction of coming out of the fitting hole 8. After the sealing device 1 is installed in this way, the elastic member 9 seals the space between the reinforcing ring 3 and the fitting hole 8, and the sealing body 4 seals the space between the reinforcing ring 3 and the shaft body 2. This seals the inside and outside of the wall 7 in a liquid-tight and air-tight manner.

By the way, in this embodiment, the case where the recessed part 10 is formed in an annular shape along the outer periphery of the elastic member 9 has been shown, but the present invention is not limited to this, and a discontinuous recessed part may be used.

Further, although the case where the elastic member 9 is press-fitted into the wall body 7 side is shown, the reinforcement ring 3 may be press-fitted to the outer periphery of the shaft body. It will be formed on the inner periphery of the member. Even in this manner, the same effects as in the embodiment described above can be achieved.

As explained above, the present invention is provided for sealing between a relatively rotating wall body and a shaft body passing through this wall body, and includes a sealing body provided with a reinforcing ring, and a sealing body opposite to the sealing body of this reinforcing ring. In the sealing device, the elastic member is press-fitted and fixed to the outer periphery of the wall or shaft body through the elastic member, and the elastic member is inserted into the outer periphery of the wall body or the shaft body. Since a recess is formed on the end press-fitting surface in the direction in which the elastic member is press-fitted to the inner periphery of the fitting hole or the outer periphery of the shaft body, there is no possibility that the recess will be crushed. The lubricant filled with the lubricant is supplied to the subsequent press-fitting surface without running out of lubricant, and the frictional resistance during press-fitting is significantly reduced. Therefore, even if the elastic member is deformed, no force in the reaction direction is applied, and the sealing device can be reliably mounted, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of essential parts showing an embodiment of the sealing device of the present invention, Fig. 2 is an explanatory diagram showing the sealing device of the present invention in the middle of press-fitting, and Fig. 3 is after completion of press-fitting of the sealing device of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Seal device, 2... Shaft body, 3... Reinforcement ring, 4... Seal body, 7... Wall body, 8... Fitting hole, 9... Elastic member, 9a... Press-fit surface, 10 ……
Recessed portion, 11...Oil (lubricant).

Claims (1)

[Scope of utility model registration request] A seal body provided for sealing between a relatively rotating wall body and a shaft body passing through the wall body, and comprising a reinforcing ring; and an elastic member fixed to a surface of the reinforcing ring facing the seal body. , and is press-fitted and fixed to the wall or the outer periphery of the shaft via the elastic member, an end press-fitting surface in the direction in which the elastic member is inserted into the wall or the outer periphery of the shaft. A sealing device characterized in that a recess is formed in the recess, and the recess is filled with a lubricant.