JPH10115375A - Oil seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil seal device to facilitate mounting of an oil seal on a mating member and be excellent in seal performance and position precision. SOLUTION: An oil seal 11 is formed such that protrusion pieces 12a and folded pieces 12b are alternately formed on the peripheral edge of a reinforcing ring 12 being a disc-form ring, and a side lip 13a and an annular protrusion 13b are formed in a seal part 13. An annular groove 16 having notch parts 16a corresponding to the respective protrusion pieces 12a and folded pieces 12b of the reinforcing rings and a flange part 16b is formed in a housing 15 being the mating member. The protrusion pieces 12a and the notch parts 16a, and the folded pieces 12b and the flange part 16b are matched with each other. By pressing the reinforcing ring 12 in the annular groove 16 and rotating them, the oil seal 11 is mounted on the housing 15 and the annular protrusion 13b is brought into contact with the inside wall surface of the annular groove 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal device mounted on a rotating part of an automobile, an industrial machine, or the like to prevent an internal fluid from flowing out and foreign substances from entering.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional oil seal of this type. The oil seal 1 includes a metal reinforcing ring 2 including a cylindrical mounting portion 2a extending in the axial direction and a flange 2b extending radially inward from an end of the mounting portion 2a. It comprises a seal portion 3 made of a rubber-like elastic body having a side lip 3a extending inward, and a fabric 4 integrally joined to the axially outer side surface of the seal portion 3. The mounting portion 2a of the reinforcing ring 2 is fitted into a mounting hole of a housing 5 of a machine or the like, and the shaft 6 is passed through the center, and the tip of the side lip 3a is brought into contact with the flange 7a of the slinger 7 fitted into the shaft 6. The tip of the fabric 4 is brought into contact with the cylindrical portion 7b of the slinger 7. The slinger 7 has a function of damping the oil by its flange 7a, further preventing the oil from flowing out by the side lip 3a, and the fabric 4 preventing the entry of foreign matter such as dust from the outside.

[0003]

However, in the above-mentioned conventional oil seal device, the metal reinforcing ring 2 is press-fitted into the mounting hole of the housing 5 which is a mating member, and is fixed by using a pressurizing device. It is necessary to attach and detach the device, and there is a problem that maintenance is poor. In addition, since the housing 5 of the mating member is usually made of metal, there is a problem that the mounting surface of the reinforcing ring 2 or the housing 5 is damaged in the axial direction at the time of press-fitting due to strong contact between the metals, and the sealing performance is reduced. . For this reason, the mounting portion of the metal reinforcing ring may be covered with the rubber of the seal portion and press-fitted into the mounting hole of the housing via this rubber. In this case, however, the mounting accuracy is poor due to springback or the like at the time of press-fitting. As a result, there is a problem that the sealing performance and the life are reduced.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an oil seal device in which an oil seal can be easily attached to a mating member, and has high sealing performance and high mounting position accuracy. .

[0005]

In order to achieve the above-mentioned object, the present invention provides a reinforcing ring which is a disc-shaped ring, in which projections and return pieces are alternately provided on the periphery of the reinforcement ring. And an annular groove having a notch and a flange corresponding to the folded piece, and the protrusion and the notch, the folded piece and the flange are aligned with each other, and the reinforcing ring is pushed into the annular groove and rotated. Thus, the oil seal is mounted on the mating member, and the oil seal can be easily mounted on the mating member, and an oil seal device having high sealing performance and high mounting position accuracy can be realized.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an oil seal device according to the present invention, a projecting piece and a folded piece are formed by folding an oil seal in a cylindrical shape with the peripheral edge of a disc-shaped ring partially directed outward in the axial direction. A reinforcing ring and a sealing portion integrally formed with the reinforcing ring and having a side lip and an annular projection in the axial direction are provided, and a mating member to which the oil seal is attached is larger than a protruding piece of a reinforcing ring peripheral edge of the oil seal. It has an annular groove having a slightly larger notch and a flange to which a cylindrical folded piece on the periphery of the reinforcing ring fits, and cuts the protruding piece and the folded piece of the reinforcing ring of the oil seal into the annular groove of the mating member. The oil seal is fitted by rotating it by pushing it into the notch and the flange, and the annular projection of the oil seal is brought into contact with the axially inner side wall of the annular groove of the mating member, making it easy to attach the oil seal to the mating member. To The sealability is good and the oil seal is not damaged in the axial direction when the oil seal is attached to the mating member. Since it can be mounted at a predetermined position regulated by the annular groove of the member, the mounting position accuracy can be improved.

[0007]

FIG. 1 shows an oil seal device according to an embodiment of the present invention. An oil seal 11 includes a reinforcing ring 12 which is a disc-shaped ring made of SPCC, aluminum, resin, or the like, and a reinforcing ring 12 of the reinforcing ring 12. A seal portion 13 made of a rubber-like elastic body having a side lip 13a and an annular projection 13b integrally formed on the inside in the axial direction, and a fabric 14 made of synthetic fiber integrally joined to the axially outer side surface of the seal portion 13 Consists of As shown in FIG. 2, the reinforcing ring 12 is formed by folding the peripheral edge of the disc-shaped ring partially in a cylindrical shape toward the outside in the axial direction, thereby forming a radial protruding piece 12 a in the circumferential direction. Piece 12b. Reference numeral 12c denotes a rotation preventing projection which, when attached to the counterpart member, fits into a concave portion of the counterpart member and serves as a rotation stop. On the other hand, as shown in FIG. 3, a housing 15, which is a mating member to which the oil seal 11 is attached, has a notch portion 16 a having a shape slightly larger than a protruding piece 12 a on a peripheral edge of a reinforcing ring 12 of the oil seal 11, An annular groove 16 having a flange 16b into which a cylindrical folded piece 12b on the periphery of the ring 12 is fitted by a clearance fit is formed.

The protruding piece 12 of the reinforcing ring 12 of the oil seal 11
a and the folded piece 12 b are connected to the annular groove 16 of the housing 15.
When pressed and rotated by a jig or the like in accordance with the notch portion 16a and the flange portion 16b, as shown in FIG. 1, the cylindrical folded piece 12b rotates while fitted inside the flange portion 16b, The protruding piece 12a enters the inside of the flange 16b to prevent it from falling off, and the annular projection 13 of the seal portion 13
b contacts the axially inner wall surface of the annular groove 16. Therefore, the shaft 17 is passed through the center of the oil seal 11 and
The tip of the side lip 13a is brought into contact with the flange 18a of the slinger 18 fitted in the sleeve 7 and the tip of the fabric 14 is brought into contact with the cylindrical portion 18b of the slinger 18. While being stopped by the flange 18a, the side lip 13a and the annular projection 13b prevent the outflow to the outside, and further prevent the intrusion of foreign matter such as dust from the outside into the fabric 14.

As described above, according to the above-described embodiment, the protruding piece 12a and the turn-back piece 12b of the metal reinforcing ring 12 are pushed and rotated in accordance with the notch 16a and the flange 16b of the annular groove 16. The oil seal 11 can be easily attached to the housing 15. In particular, by attaching a jig to the folded piece 12b and attaching the jig, the attaching operation becomes extremely easy. Oil seal 1
When the housing 1 is attached to the housing 15, the annular projection 13b of the seal portion 13 comes into contact with the axially inner wall surface of the annular groove 16, so that good sealing performance can be maintained. Since it is mounted in the annular groove 16 via the annular projection 13b, there is no axial displacement, and the mounting position accuracy can be improved. Therefore, the interference of the side lip is kept within a certain range, and the sealing performance is stabilized.

[0010]

According to the present invention, in order to achieve the above object,
Protrusions and folded pieces are provided alternately on the periphery of the reinforcing ring that is a disc-shaped ring, and the counterpart member is provided with an annular groove having a notch and a flange corresponding to the projected piece and the folded pieces, Since the projection and the notch, the folded piece and the flange are aligned with each other, and the reinforcing ring is pushed into the annular groove and rotated, the oil seal is mounted on the mating member. It is possible to realize an oil seal device that can be easily attached to the device, and has high sealing performance and high attachment position accuracy.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an oil seal device showing one embodiment of the present invention.

2A is a front view of a reinforcing ring of the oil seal device. FIG. 2B is a partially enlarged cross-sectional view taken along line AA of FIG. 2A.

3A is a front view showing a state in which an oil seal is attached to a housing which is a mating member of the oil seal device. FIG. 3B is a cross-sectional view taken along line BB in FIG. 3A.

FIG. 4 is a partial sectional view showing an example of a conventional oil seal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Oil seal 12 Reinforcement ring 12a Protrusion piece 12b Folded piece 13 Seal part 13a Side lip 13b Annular projection 14 Fabric 15 Housing 16 Annular groove 16a Notch part 16b Flange part 17 Shaft 18 Slinger

Claims (1)

[Claims] An oil seal includes a reinforcing ring having a projecting piece and a turning piece formed by cylindrically turning a peripheral edge of a disk-shaped ring partially outward in an axial direction, and integrally formed with the reinforcing ring. A sealing portion having a side lip and an annular protrusion formed in the axial direction, and a mating member to which the oil seal is attached is provided with a notch portion slightly larger than a protruding piece at a peripheral edge of a reinforcing ring of the oil seal; The oil seal has an annular groove having a flange to which a cylindrical folded piece is fitted. The protrusion and the folded piece of the reinforcing ring of the oil seal are aligned with the notch and the flange of the annular groove of the mating member. An oil seal device wherein the annular projection of the oil seal is brought into contact with an axially inner side wall of the annular groove of the mating member.