JPH09144891A - Oil seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both an oil defense function and a dust cover function for an oil seal, and reduce the cost by arranging an extendedly arranged part extendedly arranged in a cylindrical shape outside in the shaft direction in a retainer in a device where the oil seal is installed in a casing by the retainer. SOLUTION: In an oil seal device of a shaft device adopted in a transfer device, between the inner periphery of a casing 1 and the outer periphery of an installing cylinder 3, an oil seal 4 to seal these mutual parts is installed in the casing l by a retainer 6. This oil seal 4 is composed of a sealing member 5 by an O ring 7 and a metallic or synthetic resin retainer 6 having an inner peripheral part of the casing 1 and a locking projection shape 6A to be fitted to, inserted into and locked on the shaft end. The locking projection shape 6A of this retainer 6 is further extendedly arranged in a cylindrical shape outside in the shaft direction, and is formed as an extendedly arranged part 6B, and this extendedly arranged part 6B is arranged in close vicinity to it so as to cover the outer periphery of a companion flange 3B arranged on an installing shaft 3.

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 for sealing a casing and a shaft that is rotatably supported by a bearing in the casing.

[0002]

2. Description of the Related Art An oil seal device of this type for sealing a casing and a shaft rotatably supported by a bearing in the casing is provided, for example, in Japanese Patent Laid-Open No. 155841. Some are listed. This conventional example will be described with reference to FIG. 4. In FIG. 4, a drive pinion shaft 22 is arranged in a transfer casing 21, and a mounting cylinder 23 integrally fitted to the drive pinion shaft 22 is provided with a bearing metal 29 and the like. It is rotatably supported in the transfer casing 21. In such a shaft device, the lubricating oil provided for the bearing metal 29 is axially outside (see FIG. 4).
The oil seal 25 is mounted on the casing 21 or the mounting cylinder 23 on the shaft side, which is located on the axially outer side of the bearing metal 29 which is the bearing portion so as not to inadvertently leak to the left side). When oil leaks to the outside, when these shaft devices constitute a drive system of a vehicle, such as a transmission, a differential device or a four-wheel drive transfer, the leaked lubricating oil is accompanied by rotation of the mounting cylinder 23. There is a risk that the particles may be scattered around by the centrifugal force and come into contact with a high heat portion such as an exhaust pipe located near the shaft device to ignite. Further, dust from the outside adheres to the leaked lubricating oil from the oil seal 25, and the oil seal is deteriorated at an early stage, resulting in deterioration of the sealing function. Therefore, as shown in the conventional example of FIG. 4, a cylindrical oil defense 26 that can effectively prevent the lubricating oil from scattering due to the centrifugal force of the mounting cylinder 23 is attached to the casing 21, and the oil A cylindrical dust cover 27, which is arranged in a labyrinth shape and prevents dust from entering from the outside, is attached to the mounting cylinder 23.

[0003]

However, in such a conventional oil seal device, as described above,
The cylindrical oil defense 26 and the cylindrical dust cover 27 arranged in a labyrinth shape with the cylindrical oil defense 26 to prevent intrusion of dust from the outside are required, respectively, which leads to restrictions on layout and increase in cost.

Therefore, in the present invention, the problems as seen in the above-mentioned conventional apparatus are solved, and the oil seal has both the oil defense function and the dust cover function, so that there is a disadvantage in layout. It is an object of the present invention to provide an oil seal device having a low cost and a simple structure, which has been solved to save space.

[0005]

In view of the above, according to the present invention, an oil seal for sealing a casing and a shaft rotatably supported by a bearing in the casing is attached to the casing by a retainer. In the device, the retainer is extended axially outwardly in a cylindrical shape to form an extended portion, which is a means for solving the problem. Further, according to the present invention, an annular companion flange is provided so as to project in the vicinity of the oil seal of the shaft or a mounting cylinder integrally fitted to the shaft, and the companion flange is made to approach so as to cover the outer periphery of the flange. It is characterized in that an extended portion is arranged. Further, the present invention is characterized in that an oil collecting groove is formed in at least one place of an inner peripheral portion of the extending portion, and these are means for solving the problems.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, showing a cross-sectional view of the upper half of the vicinity of a shaft device, which is a main part, and a shaft adopted in a transfer device of a four-wheel drive vehicle. It is an oil seal device of the device. A shaft 2, which is an output shaft, is rotatably supported in a casing 1 of the transfer device via a bearing 9, and a mounting cylinder 3 is attached to the shaft 2.
Are fitted by spline fitting of spline portions 8 engraved on their inner and outer circumferences, and the shaft 2 and the mounting cylinder 3 are integrally tightened and connected by a tightening nut 10 screwed to the shaft end of the shaft 2. It A mounting flange 3A for mounting a propeller shaft or the like (not shown) is formed on the shaft end of the mounting cylinder 3, and an annular companion flange 3B is provided in proximity to an oil seal 4 described later. Between the inner circumference of the casing 1 near the outer side of the bearing 9 in the axial direction and the outer circumference of the mounting cylinder 3, an oil seal 4 is mounted on the casing 1 by a retainer 6 (in some cases, on the shaft side). The lubricating oil provided for lubrication of the bearing 9 is prevented from leaking to the outside in the axial direction (the left side in FIG. 1) inadvertently. The oil seal 4 is
A seal member 5 made of an elastic material such as rubber pressed against the outer periphery of the mounting cylinder 3 by an O-ring 7, and a member fixedly attached to the seal member 5 and fitted and locked to the inner peripheral portion and the shaft end of the casing 1. And a retainer 6 made of metal or synthetic resin having a stop projection 6A, and the seal member 5 is provided with a lip portion 8 slidably contacting a side surface of a companion flange 3B formed on the mounting shaft 3. Performs sealing action of lubricating oil.

In the present invention, in such an oil seal device, the retainer 6 of the oil seal 4 mounted on the inner peripheral portion of the casing 1 is further provided with a locking projection 6A to the axial end portion of the casing 1. The extended portion 6B is formed by extending in a cylindrical shape to the outside, and the extended portion 6B is arranged in close proximity so as to cover the outer circumference of the companion flange 3B provided on the mounting shaft 3. The cylindrical extension 6B of the retainer 6 in the oil seal 4
Needless to say, the companion flange 3B, which is disposed in close proximity so as to cover the shaft 2, may be directly provided on the shaft 2 (in that case, the mounting flange 3A for mounting a propeller shaft or the like (not shown) is the shaft 2 which is the output shaft directly). Formed).

With the above-mentioned structure, the presence of the oil seal 4 fitted and mounted on the shaft end of the casing 1 by the retainer 6 causes the lubricating oil used for lubricating the bearing 9 to be the outer periphery of the mounting cylinder 3. Although it does not inadvertently leak to the outside in the axial direction, if the lubricating oil leaks to the outside,
Even if these leaking lubricating oils are scattered around by the centrifugal force caused by the rotation of the mounting cylinder 3, the tubular extension portion 6B of the retainer 6 in the oil seal 4 forms an oil defense and the lubrication is performed. Since the oil leakage is effectively prevented, there is no possibility that the leaked lubricating oil may come into contact with a high temperature portion such as an exhaust pipe located near the shaft device and ignite. Moreover,
If the outer circumference of the companion flange 3B provided on the mounting shaft 3 is abutted on the inner side of the cylindrical extending portion 6B of the retainer 6, the companion flange 3B and the cylindrical shape of the retainer 6 can be formed. A labyrinth passage is formed by the extended portion 6B, so that the lubricating oil can be more effectively prevented from leaking to the outside. In addition, since the cylindrical extension portion 6B of the retainer 6 also forms a dust cover that effectively prevents the intrusion of dust and the like from the outside, the leaked lubricating oil from the oil seal 4 is prevented from leaking from the outside. There is no possibility that the dust adheres to the oil seal and deteriorates the oil seal at an early stage to deteriorate the sealing function. As described above, in the oil seal device according to the present invention, the oil seal can have both the oil defense function and the dust cover function by the simple structure of the oil seal, and the layout disadvantage of the oil seal device can be eliminated. It is now possible to provide a low-cost oil seal device that saves space.

FIG. 2 shows a second embodiment of the oil seal of the present invention. The basic shape of the oil seal is almost the same as that of the first embodiment, but the second embodiment
The embodiment is characterized in that an oil collecting groove 6C is formed in at least one location of the inner peripheral portion of the cylindrical extending portion 6B of the retainer 6. The oil collecting groove 6C is formed by projecting a part of the circumference of the cylindrical extending portion 6B outward in the radial direction so as to be inclined in the axial direction, and should the lubricating oil seal the oil seal 4. When it leaks from the member 5 to the outside and scatters and adheres to the inner peripheral surface of the cylindrical extending portion 6B of the retainer 6 due to the centrifugal force accompanying the rotation of the mounting cylinder 3,
These leaked lubricating oils are collected in one place and dropped and discharged. Needless to say, the position of the oil collecting grooves 6C is set at a position avoiding a high heat source such as an exhaust pipe, but the required number of oil collecting grooves 6C may be provided.

FIG. 3 shows a third embodiment of the oil seal of the present invention. The basic shape of the oil seal is the same as that of the first embodiment.
In the embodiment, the extended portion 6B in the above embodiment is further extended outward in the axial direction as the cylindrical extended portion of the retainer 6 so that the disc portion 6V and the disc portion 6V each having a larger diameter are provided. The subsequent cylindrical extending portion 6H is provided, and the cylindrical extending portion 6H covers the mounting flange 3A of the mounting cylinder 3 and is close to the outer periphery thereof. Thereby, due to the proximity of the extended portion 6B to the outer peripheral portion of the companion flange 3B and the proximity of the extended portion 6H to the outer peripheral portion of the mounting flange 3A, the scattering of the lubricating oil and the intrusion of dust from the outside are doubled. It can be prevented.

Although the embodiment of the present invention has been described above, the shape of the casing, the shape of the shaft (the configuration related to the mounting cylinder, the presence or absence of the mounting cylinder, etc.), the casing, are within the scope of the gist of the present invention. And shaft support form and bearing shape,
Regarding the shape of the oil seal (the shape of the seal member and the retainer, the related structure between them), the material and the mounting form of the casing or shaft, the shape of the extension part, the shape of the companion flange, the shape of the oil collecting groove, etc. It goes without saying that it can be appropriately adopted.

[0012]

As described in detail above, according to the present invention, if the lubricating oil provided for the lubrication of the bearing leaks to the outer side in the axial direction, these leaking lubricating oils are used. Even if it is scattered around by the centrifugal force caused by the rotation of the oil, the cylindrical extension of the retainer in the oil seal forms an oil defense and effectively prevents the leakage of the lubricating oil. There is no longer a risk of ignition due to contact with a high temperature part such as an exhaust pipe located in the vicinity of the shaft device.

Further, if the outer periphery of the companion flange provided on the shaft is adjacent to the cylindrical extension portion of the retainer so as to be in contact therewith, the cylindrical extension portion of the companion flange and the retainer is provided. A labyrinth passage is formed by the portion and the lubricating oil can be more effectively prevented from leaking to the outside. In addition, since the cylindrical extension portion of the retainer also forms a dust cover that effectively prevents invasion of dust and the like from the outside, the leakage of the lubricating oil from the oil seal prevents dust from the outside. There is no possibility that the oil seal adheres to the oil seal and deteriorates the oil seal early to deteriorate the sealing function. As described above, in the oil seal device according to the present invention, the oil seal can have both the oil defense function and the dust cover function by a simple structure in which the retainer in the oil seal is simply extended. It has become possible to provide a low-cost oil seal device that eliminates disadvantages in the layout of the seal device and saves space.

Further, if a part of the circumference of the cylindrical extending portion is projected outward in the radial direction in an inclined manner in the axial direction to form the oil collecting groove, the lubricating oil should escape from the seal member of the oil seal. When leaking to the outside and scattering and adhering to the inner peripheral surface of the cylindrical extension part of the retainer due to the centrifugal force caused by the rotation of the shaft, these leaking lubricating oils are located at positions avoiding high heat sources such as exhaust pipes. It is possible to collect it in one place, drop it, and discharge it, and it is possible to prevent a vehicle fire or the like due to ignition of leaked lubricating oil. Further, if the retainer is extended to the outside in the axial direction as a cylindrical extension and installed up to the position where it covers the mounting flange on the shaft, this allows the extension of the retainer to be the outer periphery of the companion flange. Due to the proximity to the outer peripheral portion of the mounting flange, it is possible to prevent double scattering of lubricating oil and intrusion of dust from the outside. In this way, by providing the oil seal with both the oil defense function and the dust cover function, it is possible to provide a low-cost and simple-structure oil seal device that eliminates layout disadvantages and saves space.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an upper half of a main part showing a first embodiment of an oil seal device of the present invention.

FIG. 2 is a diagram showing a second embodiment of the oil seal of the present invention.

FIG. 3 is a cross-sectional view of the upper half of an essential part showing a third embodiment of the oil seal device of the present invention.

FIG. 4 is a sectional view of an essential part showing a conventional oil seal device.

[Explanation of symbols]

 1 Casing 2 Shaft 3 Mounting Tube 3A Mounting Flange 3B Companion Flange 4 Oil Seal 5 Sealing Member 6 Retainer 6B Extension 6C Oil Collection Groove 7 O-ring 9 Bearing

Claims (3)

[Claims] 1. An oil seal device in which an oil seal for sealing a casing and a shaft rotatably supported by a bearing in the casing is attached to the casing by a retainer, wherein the retainer is axially outward. An oil seal device, wherein the oil seal device is formed by extending in a cylindrical shape to form an extending portion. 2. A ring-shaped companion flange is provided so as to project in the vicinity of the oil seal of the shaft or a mounting cylinder that is integrally fitted to the shaft, and the companion flange is made to approach so as to cover the outer periphery of the flange. The oil seal device according to claim 1, wherein an installation portion is arranged. 3. The oil collecting groove is formed in at least one place of an inner peripheral portion of the extending portion.
The oil seal device described in.