JP2002227858A - Seal device of bearing for axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain low torque operation while maintaining seal performance, in a seal device of a bearing for an axle. SOLUTION: In this seal device of a bearing for an axle, the seal device 9 comprises a slinger 11 of L-shaped section, formed by a cylinder part 12 fixed to an external peripheral surface of an inner ring member 1 and a flange 13 extended in a diametric direction toward an outer ring member 5 from a bearing external side end part of this cylinder part 12, and a seal annular body 14, formed with a cylinder part 16 fixed to an internal peripheral surface of the outer ring member 5 and an internal peripheral lip 18 coming into slide contact with an inner surface of the slinger 11, the seal device is characterized by constituting it with a ring 21 consisting of lubricating resin fixed to an internal peripheral surface of the cylinder part 16 of the seal annular body 14 and with an external peripheral surface of the slinger 11 brought into slide contact with an internal peripheral surface of this ring 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle bearing sealing device used for an automobile.

[0002]

2. Description of the Related Art Conventionally, an axle bearing device used in an automobile or the like is known as shown in FIGS. That is, a fixed outer ring member 31 having a flange 31a attached to a vehicle body (not shown), a hub member 30b having a flange 30a to which a wheel not shown is attached, and an inner ring fitted to an end of the hub member 30b. A sealing device 34 having a rotating side inner ring member 30 composed of 30c and a rolling element 32 interposed between the inner and outer ring members 30, 31 and held by a retainer 33, and sealing between the inner and outer ring members 30, 31. , 35 are both ends 31b, 31c of the outer race member 31
Mounted on the side. Outer ring member end 3 on the inner side of the vehicle body
1b includes a cylindrical portion 36a fixed to the outer peripheral surface 30d of the inner race 30c and a cylindrical portion 36a.
a slinger 36 having an L-shaped cross section formed from a flange 36b extending radially from the outer end of the bearing toward the outer ring member 31; and a cylindrical portion 37a fixed to the inner peripheral surface 31d of the outer ring member 31. The inner surface 36c of the slinger 36
Ring body 3 formed with inner peripheral lip 37b that slides on
7 are formed. A labyrinth gap 38 is formed between the flange 36b of the slinger 36 and the cylindrical portion 37a of the seal ring 37.

[0003]

Generally, in axle bearings, the lip sliding resistance of the sealing device 34 occupying a large part of the rolling resistance is great, and there is a very strong demand for a reduction in torque in the sealing device 34. For this reason, it is considered that the contact pressure of the inner peripheral lip 37b of the seal ring body 37 with the inner surface 36c of the slinger 36 constituting the sealing device 34 is reduced to lower the rotational torque. However, since the labyrinth gap 38 is formed between the flange 36b of the slinger 36 and the cylindrical portion 37a of the seal ring 37, muddy water or the like applied to the bearings while the vehicle or the like is running is transmitted through the flange 36b of the slinger 36, and the labyrinth gap is formed. 38 may enter the interior of the sealing device 34. At this time, the inner peripheral lip 37b of the seal ring 37 with respect to the inner surface 36c of the slinger 36
If the contact pressure of the lip 37b is reduced, muddy water or the like easily enters the lip sliding contact portion, which may cause damage to the lip 37b. If the lip 37b is damaged, muddy water or the like will enter the inside of the bearing, and the bearing life will be shortened. For this reason, in the conventional sealing device 34, it was difficult to reduce the torque while maintaining the sealing performance.

[0004] It is an object of the present invention to reduce the torque while maintaining the sealing performance in a sealing device for an axle bearing.

[0005]

As means for solving the above-mentioned problems, in the invention of claim 1, a rolling element interposed between a fixed outer ring member, a rotating inner ring member, and an inner and outer ring member. A sealing device for an axle bearing in which a sealing device for sealing between the inner and outer ring members is mounted on an end portion side of the outer ring member, wherein the sealing device is fixed to an outer peripheral surface of the inner ring member and the cylindrical portion. A cross section L formed from a flange extending radially from the outer end of the bearing toward the outer race member of the portion
And a seal ring having a cylindrical portion fixed to the inner peripheral surface of the outer ring member and an inner peripheral lip that slides on the inner surface of the slinger, and a lubricating resin is formed on the inner peripheral surface of the cylindrical portion of the seal ring. The ring body is fixed, and the outer peripheral surface of the flange of the slinger slides on the inner peripheral surface of the ring body.

Further, in the invention of claim 2, the lubricating resin is polytetrafluoroethylene.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. 1 and 2 show an embodiment of the present invention. A stationary outer ring member 5 having a flange 6 attached to a vehicle body (not shown), and a hub member 2 having a flange 3 attached to a wheel not shown.
A rotating inner ring member 1 comprising an inner ring 4 fitted and fixed to an end of the hub member 2 and a rolling element 7 interposed between the inner and outer ring members 1 and 5 and held by a retainer 8. Sealing devices 9 and 10 for sealing between the inner and outer ring members 1 and 5 are mounted on both ends 5 a and 5 b of the outer ring member 5.

The sealing device 9 mounted on the end portion 5a of the outer ring member 5 on the inner side of the vehicle body includes a cylindrical portion 12 fixed to the outer peripheral surface 4a of the inner ring 4 and an outer ring member from the outer end of the cylindrical portion 12 on the bearing side. L-shaped stainless steel slinger 11 formed from a flange 13 extending radially toward
And a seal ring 1 fixed to the inner peripheral surface 5a of the outer ring member 5.
4. This seal ring 14 is
A cylindrical portion 16 fixed to the outer ring member 5 so as to face the outer peripheral surface 13a of the flange 13 of the slinger 11;
6 to the flange 13 of the slinger 11 from the inner end of the bearing.
The cylindrical portion 1 of the slinger 11 while facing the inner surface 13b
(2) Cross section L composed of a flange 17 heading to the outer peripheral surface 12a
The core metal 15 is formed of a plurality of inner peripheral lips 18, 19, and 20 provided on the inner peripheral portion of the flange 17 of the core metal 15 and slidably in contact with the inner surface of the slinger 11. More specifically, the plurality of inner lips 18, 19, 20 are triple lips, and a main lip 18 in the center and an auxiliary lip 19 inside the bearing are provided on the outer peripheral surface 12a of the cylindrical portion 12 of the slinger 11.
The side auxiliary lip 20 on the outer side of the bearing slides on the inner surface 13 b of the flange 13 of the slinger 11.

A ring 21 made of a lubricating resin is fitted and fixed to the inner peripheral surface 16a of the cylindrical portion 16 of the core metal 15 of the seal ring 14, and the inner peripheral surface 21a of the ring 21 is fixed.
The outer peripheral surface 13a of the flange 13 of the slinger 11 is configured to be lightly contacted and slidably contacted. Thereby, the gap between the slinger 11 and the seal ring 14 is eliminated. Further, as the lubricating resin, polytetrafluoroethylene, polyethylene, polyoxymethylene,
Polyamide and the like can be mentioned, but polytetrafluoroethylene is most suitable in terms of low friction and high lubrication performance.

[0010]

According to the sealing device for axle bearings of the present invention,
Since there is no gap between the slinger and the seal ring, no muddy water enters the inside of the sealing device from outside, so even if the contact pressure of the inner peripheral lip of the seal ring that slides on the inner surface of the slinger is reduced, The damage of the lip caused by the above is prevented. As a result, the torque can be reduced while maintaining the sealing performance of the sealing device.

In particular, since the above-mentioned ring body is formed of polytetrafluoroethylene which is excellent in that it has low friction and high lubrication performance, it is easier to reduce the torque.

[Brief description of the drawings]

FIG. 1 is a sectional view of an axle bearing sealing device according to the present invention.

FIG. 2 is an enlarged sectional view of the sealing device of the present invention.

FIG. 3 is a cross-sectional view of a conventional axle bearing sealing device.

FIG. 4 is an enlarged sectional view of a conventional sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner ring member 2 Hub member 3 Flange 4 Inner ring 5 Outer ring member 6 Flange 7 Rolling element 8 Cage 9 Sealing device 10 Sealing device 11 Slinger 12 Cylindrical part 13 Flange 14 Seal ring 15 Core metal 16 Cylindrical part 17 Flange 18 Main lip 19 Auxiliary lip 20 Side auxiliary lip 21 Wheel body

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomotaka Nakagawa 3-5-8 Minamisenba, Chuo-ku, Osaka-shi F-Term in Koyo Seiko Co., Ltd. 3J016 AA02 BB03 CA02

Claims (2)

[Claims] A fixed outer ring member, a rotating inner ring member,
A sealing device for an axle bearing having a rolling element interposed between the inner and outer ring members, and a sealing device for sealing between the inner and outer ring members mounted on an end portion of the outer ring member; A slinger having an L-shaped cross section formed from a cylindrical portion fixed to the outer peripheral surface and a flange extending radially from the outer end of the cylindrical portion toward the outer ring member, and fixed to the inner peripheral surface of the outer ring member. A cylindrical ring and a seal ring formed with an inner peripheral lip that is in sliding contact with the slinger inner surface, and a ring made of a lubricating resin is fixed to the cylindrical inner circumferential surface of the seal ring. A sealing device for an axle bearing, wherein a flange outer peripheral surface of a slinger slides on an inner peripheral surface. 2. The axle bearing sealing device according to claim 1, wherein the lubricating resin is polytetrafluoroethylene.