JP2546692Y2 - Sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device which may be removed from a mounting hole for maintenance of an internal structure or the like.

[0002]

2. Description of the Related Art FIG. 3 shows a pair of oil seals 100 as a conventional sealing device of this kind. The oil seal 100 is fitted into a shaft hole (mounting hole) 102 of the housing 101 and separates the outside A and the inside B between the oil seals 100.

In the interior B, there is provided a bearing 103 as an internal structure attached to the shaft hole 102, and supports a shaft 104 inserted into the shaft hole 102.

[0004] The oil seal 100 has a seal body 105 made of a rubber-like elastic body and a metal ring 106, and the outer peripheral surface of the seal body 105 is fitted into the shaft hole 102.
On the other hand, the seal lip 10
7, the seal lip 107 is in contact with the shaft 104.

[0005] A pull-out projection 108 is provided on the seal body 105 at a position facing the outside A, that is, on the end face.

[0006] In the above configuration, the oil seal 100 is removed from the shaft hole 102 by grasping the projection 108 of the oil seal 100 and pulling the oil seal 100 along the axis (not shown) of the shaft 104 in the direction of arrow D. Performing maintenance.

[0007]

However, when the pair of oil seals 100 are combined and fitted into the shaft hole 102 as described above, the pressure in the inside B is in a negative pressure state with respect to the outside A. Therefore, the oil seal 10
It was difficult to remove the 0.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has as its object to provide a sealing device capable of eliminating a negative pressure state inside the housing prior to removal from a housing.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention forms a seal body which fits into a mounting hole of a housing and separates the inside from the outside. A storage chamber for storing a fluid to be discharged to the inside is provided at a position facing the storage space.

[0010]

According to the present invention based on the above structure, the fluid in the storage chamber is discharged to the inside before the housing is removed from the mounting hole, so that the negative pressure state in the inside is eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to FIGS. FIG. 1 is a front half sectional view. A pair of oil seals 3 is fitted in a shaft hole (mounting hole) 2 of the housing 1. The oil seal 3 is spaced at a predetermined interval, and forms an inside E between the oil seal 3 and separates it from the outside F. A bearing 4 as an internal structure is provided in the inside E, and the shaft 4 is supported by the bearing 4.

The oil seal 3 has a seal body 6 made of a rubber-like elastic body and a metal ring 7 to which the seal body 6 is baked. An air reservoir 8 as a storage chamber is formed on the seal body 6 at a position facing the inside E, that is, at the end face. The air pool 8 is formed by projecting the end face of the seal body 6 on the external F side into a hemispherical shape 9.

As shown in FIG. 2, the air reservoirs 8 are arranged on the same circumference along the circumferential direction, and the number of air reservoirs 8 is determined by the size of the oil seal 3, that is, the volume of the inside E. I do.

It is a matter of course that the metal ring 7 is provided with a through hole in the thickness direction at a position corresponding to the air reservoir 8.

An annular projection 10 is provided on the end face of the seal body 6 facing the outside F. Further, on the inner peripheral side of the seal body 6, there are provided a main seal lip 11 inclined toward the external F side and a sub seal lip 12 inclined toward the internal E side. Is attached.

In the above configuration, the pressure in the inside E is equal to the pressure in the outside F
, The projection 9 may be crushed before the oil seal 3 is removed (elastic deformation).
Then, the air in the air pool 8 is released to the inside E,
Is eliminated.

The oil seal 3 can be easily removed from the shaft hole 2 by grasping the protrusions 10 of the oil seal 3 and pulling the oil seal 3 away from each other, ie, in the direction of arrow G.
Thereafter, maintenance of the bearing 4 may be performed.

In the above embodiment, the air pool 8 is provided on both the oil seals 3, but the air pool 8 may be provided on only one of the oil seals. In addition, although a combination of a pair of oil seals 3 is used, one of them may be a wall instead of the oil seal. In addition, this air reservoir can be applied not only to an oil seal but also to a blind lid or the like.

Further, the air reservoir 8 is always in communication with the interior E, but the diameter of the interior E is reduced and the interior E is closely contacted. It is good also as a structure which performs.

[0020]

[Effect of the Invention] Since the present invention is constructed as described above, the sealing device can be easily removed from the mounting hole if the fluid in the storage chamber is discharged to the inside to eliminate the negative pressure therein.

[Brief description of the drawings]

FIG. 1 is a front half sectional view of an oil seal to which the present invention is applied.

FIG. 2 is a partial side view of the oil seal of FIG. 1 as viewed from the outside.

FIG. 3 is a front half sectional view of a conventional oil seal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Shaft hole 3 Oil seal 4 Bearing 5 Shaft 6 Seal body 7 Metal ring 8 Air pocket 9 Projection part 10 Projection 11 Main seal lip 12 Secondary seal lip 13 Spring E Internal F External G Oil seal removal direction

Claims (1)

(57) [Scope of request for utility model registration] 1. A storage chamber that fits into a mounting hole of a housing to form a seal body that separates the inside from the outside, and that stores fluid to be discharged into the seal body at a position facing the inside. A sealing device comprising: