JP2509592Y2 - Oil seal for 2-liquid sealing - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention is used when there is an object to be sealed on both sides of an oil seal, and especially when there are different objects to be sealed such as different kinds of oil or oil and muddy water on both sides of the oil seal. The present invention relates to an oil seal for sealing two liquids suitable for

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional oil seal of this type. This oil seal includes a metal reinforcing ring 1 having a housing mounting portion 1a on the outer peripheral portion, and seal lips 2a, 2 on both sides of the inner peripheral end portion of the reinforcing ring 1, respectively.
a rubber portion 2 having b, and springs 4 and 5 for pressing the respective seal lips 2a and 2b against the surface of the shaft 3 facing each other,
The housing mounting portion 1a of the reinforcing ring 1 is used by press-fitting it into the fitting portion of the housing 6 via the rubber portion 2.

[0003]

In such an oil seal for sealing two liquids, two seal lips 2a, 2b are used.
It is desirable to use the optimum rubber material according to the object to be sealed. For example, an acrylic rubber material with high heat resistance is used on the oil side, and a standard material, nitrile rubber, is used on the muddy water side.

However, in the oil seal structure shown in FIG. 7, it is difficult to integrally form the seal lips 2a and 2b by using different rubber materials. For this reason, an oil seal for two-liquid sealing in which two kinds of oil seals having different rubber materials of the seal lip are combined and integrated has been proposed, but the assembly is troublesome and the cost is high.
There was a problem that the weight became heavy.

The present invention solves such a conventional problem, and is easy to assemble, low in cost, light in weight, and capable of using different rubber materials as the rubber material of the seal lip. The purpose is to provide an oil seal for use.

[0006]

To achieve the above object, an oil seal for two-liquid sealing of the present invention has seal lips on both sides of an inner peripheral end portion of a reinforcing ring having a housing mounting portion on the outer peripheral portion. Then, the base of the auxiliary seal lip is attached to a portion of at least one seal lip of the oil seal body to which the spring is attached, which presses each seal lip against the opposing shaft surface. The configuration is adopted. A spring similar to the spring is integrally molded with the base portion of the auxiliary seal lip, or a spring configured as a separate component is attached to the base portion.

[0007]

According to the present invention, the auxiliary seal lip can be molded with a rubber material different from the rubber material of the seal lip on the main body side and can be attached to the seal lip on the main body side, which is easy to assemble and low cost. It is possible to easily realize a two-liquid-sealing oil seal that is light in weight and uses different rubber materials.

Further, according to the present invention, the auxiliary seal lip can be a dust lip or a side lip, and a general two-liquid sealing oil seal can be replaced with a dust lip or a side lip by a two-liquid sealing oil seal. Can be changed.

[0009]

1 shows an embodiment of the present invention. The oil seal includes an oil seal body 11 and an auxiliary seal lip 12. The oil seal body 11 includes a metallic reinforcing ring 13 having a housing mounting portion 13a on the outer peripheral portion, a rubber portion 14 having seal lips 14a and 14b on both sides of the inner peripheral end portion of the reinforcing ring 13, and one seal. And a spring 16 for pressing the lip 14a against the surface of the shaft 15 facing it. The auxiliary seal lip 12 has the spring mounting portion 14 of the other seal lip 14b.
The base portion 12a attached to the c is provided with a lip portion 12b extending obliquely inward in the radial direction from the base portion 12a.
A spring 17 similar to the spring 16 is integrally formed with the 2a. The base portion 12a of the auxiliary seal lip 12 is attached to the spring attachment portion 14c of one seal lip 14b of the oil seal body 11, and when the oil seal body 11 is press-fitted into the fitting portion of the housing 18, the lip portion 1
2b is formed in a shape and size that elastically presses the shaft 15. The spring 17 also enhances the force with which the auxiliary seal lip 12 fits into the seal body.

When the auxiliary seal lip 12 is attached to the oil seal main body 11, one seal lip 14a of the oil seal main body 11 is pressed against the surface of the shaft 15 by the spring 16, and the other seal lip 14b of the oil seal main body 11 is an auxiliary seal. The spring 17 of the lip 12 presses against the surface of the shaft 15. Further, the auxiliary seal lip 12 presses the lip portion 12b against the surface of the shaft 15 by its own elastic force. Thus, this oil seal has three seal lips 14a, 1
4b and 12 seal between the shaft 15 and the housing 18 to further enhance the hermeticity.

The seal lip 14 of the oil seal body 11
Different rubber materials may be used for the a and 14b and the auxiliary seal lip 12. This makes it possible to select the most suitable rubber material for both sides of the oil seal,
The sealing performance can be further enhanced.

FIG. 2 shows another embodiment of the present invention.
The difference from the above embodiment is that the auxiliary seal lip 22 has a base portion 22a integrally provided with a spring 17 to be attached to the spring attachment portion 14c of the other seal lip 14b of the oil seal body 11 and a spring 19 provided by another spring 19. 15 is provided with the lip portion 22b pressed against the surface, and the other portions are the same as those in the above-described embodiment. As a result, the auxiliary seal lip 22 is more reliably pressed against the surface of the shaft 15 and the sealing performance can be further enhanced.

FIG. 3 shows another embodiment of the present invention. 1 differs from the embodiment shown in FIG. 1 in that the auxiliary seal lip 32 has a base portion 32a integrally provided with a spring 17, and a lip portion 3 extending obliquely outward in the radial direction from the base portion 32a.
2b, and other parts are the same as the embodiment shown in FIG. In this embodiment, the auxiliary seal lip 32 functions as a side lip, so
The liquid-sealing oil seal can be used as an oil seal with a side lip.

FIG. 4 shows still another embodiment of the present invention. This embodiment is different from the above embodiments in that the auxiliary seal lip 42 has a base portion 42a integrally provided with a spring 17,
The first lip portion 42b obliquely extends from the base portion 42a toward the inner side in the radial direction, and the second lip portion 42c obliquely extends from the base portion 42a toward the outer side in the radial direction. The part is the same as in the above embodiment.
In this embodiment, the first lip portion 42b of the auxiliary seal lip 42 presses against the surface of the shaft 15 to enhance the sealing performance, and the second lip 42c presses against a mating member (not shown) to function as a side lip. Therefore, it can be used as an oil seal with a highly sealed side lip.

In the above embodiment, the auxiliary seal lip 1
2, 22, 32, 42 can be attached to each of the two seal lips 14a, 14b of the oil seal body 11. Thereby, the hermeticity can be further enhanced.

In the above embodiment, the auxiliary seal lips 12 and 42 can be used as dust lip, and a general two-liquid sealing oil seal can be used as an oil seal with dust lip.

In addition, the auxiliary seal lip in the present invention can be modified in various shapes, and the mounting of the oil seal body on the seal lip can be modified in various shapes and modes. For example, in each of the above embodiments,
The spring 17 is formed integrally with the base of the auxiliary seal lips 12, 22, 32, 42, but the spring 17 as a separate component is attached to the base of the auxiliary seal lips as shown in FIGS. 5 and 6, for example. You may do it.

[0018]

As described above, according to the oil seal for two-liquid sealing of the present invention, the base portion of the auxiliary seal lip is attached to the spring mounting portion of the seal lip of the oil seal body, and the base portion of the auxiliary seal lip is attached. Since the seal lip of the oil seal main body is pressed against the shaft surface facing the oil seal body through the base by a spring that is mounted or integrally formed with it, the assembly is simple, the cost is low, the weight is light, and the different types are different. It is possible to easily realize a two-liquid-sealing oil seal having a high hermeticity using the above rubber material. In particular, since a general-purpose double lip type oil seal can be used as the oil seal body, its practicality is extremely high.

Further, according to the present invention, since the auxiliary seal lip can be a dust lip or a side lip,
A general two-liquid sealing oil seal can be easily changed to a two-liquid sealing oil seal with a dust lip or a side lip.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an oil seal for sealing two liquids showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a two-liquid sealing oil seal according to another embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a two-liquid sealing oil seal showing still another embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a two-liquid sealing oil seal showing still another embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a modified example of each of the embodiments.

FIG. 6 is a partial cross-sectional view showing another modification of each of the embodiments.

FIG. 7 is a partial sectional view showing an example of a conventional oil seal for sealing two liquids.

[Explanation of symbols]

 11 Oil seal body 12, 22, 32, 42 Auxiliary seal lip 12a, 22a, 32a, 42a Base portion 12b, 22b, 32b, 42b, 42c Lip portion 13 Reinforcing ring 13a Housing mounting portion 14 Rubber portion 14a, 14b Seal lip 14c Spring Mounting part 15 Shafts 16, 17, 19 Spring 18 Housing

Claims (2)

(57) [Scope of utility model registration request] 1. An oil having seal lips on both sides of an inner peripheral end of a reinforcing ring having a housing mounting portion on an outer peripheral portion, and the seal lips being pressed against opposing shaft surfaces by springs. An oil seal for two-component sealing, wherein the base portion of an auxiliary seal lip integrally formed with a base portion is attached to a portion of at least one seal lip of the seal body to which the spring is attached. 2. Oil having seal lips on both sides of an inner peripheral end portion of a reinforcing ring having a housing mounting portion on an outer peripheral portion, and the seal lips being pressed by a spring against opposing shaft surfaces. A base of an auxiliary seal lip is attached to a portion of at least one seal lip of the seal body where the spring is attached, and a spring configured as a separate component similar to the spring is attached to the base. An oil seal for sealing two liquids.