JP2000018260A - Rolling bearing with seal ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a muddy water and the like from reaching the slide contact part between a seal lip and its opposite surface, even in such a severe using condition that a rolling bearing is provided under the floor of an automobile, and a muddy water or the like is splashed on it, so as to secure the durability and the reliability. SOLUTION: On the outer peripheral surfaces to both ends of an inner ring 3 rotating in the using condition, slingers 15 and 15 are fixed respectively by fitting from the outer side. On the inner peripheral surfaces at both ends of an outer ring 2 not rotating even in the using condition, the outer peripheral edges of seal rings 6a and 6a are locked respectively. The inner peripheral edges of seal lips 11a and 11a to compose the seal rings 6a and 6a are slide contacted on the outer peripheral surfaces of cylinders 17 and 17 to compose the above slingers 15 and 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A rolling bearing with a seal ring according to the present invention is used for supporting a rotating shaft such as a propeller shaft or a constant velocity joint shaft for transmitting a rotating force from a transmission of an automobile to driving wheels.

[0002]

2. Description of the Related Art As a ball bearing to be incorporated in a rotation supporting portion of a rotating shaft such as a propeller shaft, a sealing type rolling bearing 1 with a seal ring as shown in FIG. 4 has been widely used. The rolling bearing 1 with a seal ring includes an outer ring 2 and an inner ring 3 arranged concentrically with each other, a plurality of balls 4 as rolling elements, a retainer 5, and a pair of seal rings 6, 6. An outer raceway 7 is provided at the center of the inner peripheral surface of the outer race 2.
An inner raceway 8 is formed at the center of the outer peripheral surface of the inner race 3. Further, between the outer raceway 7 and the inner raceway 8, the plurality of balls 4 rotatably held by the retainer 5 are provided. Based on the rolling of the plurality of balls 4, the relative rotation between the outer ring 2 and the inner ring 3 becomes free.

[0003] Locking grooves 9 are formed at both ends of the inner peripheral surface of the outer ring 2 over the entire circumference. Each of the seal rings 6 is composed of a ring-shaped core 12 and an elastic material 13 such as an elastomer such as rubber, and an outer peripheral edge of the elastic material 13 is formed with each of the locking grooves 9. , 9 to support and fix the seal rings 6, 6 to the outer race 2. Then, the leading edges of the seal lips 11, 11 provided on the inner peripheral edges of the elastic members 13, 13 are inserted into the concave grooves 10, 10 formed on both ends of the outer peripheral surface of the inner ring 3, and these Partial surfaces of the grooves 10 are slidably contacted over the entire circumference.

When using the rolling bearing 1 with the seal ring constructed as described above, the pair of seal rings 11, 1
Lubricant such as grease is filled in a space 14 between each of the balls 4 where the balls 4 are installed, and the space between the outer raceway 7 and the inner raceway 8 and the rolling surface of each ball 4 is filled. Lubricate contact parts. Further, in the case of such a rolling bearing 1 with a seal ring, the pair of seal rings 11, 11 block the space 14 from the external space, and the rainwater, dust, etc. existing in the external space. Foreign matter is prevented from entering the space 14. In addition to preventing deterioration of the lubricant, the outer raceway 7 and the inner raceway 8 and the balls 4
The abrasion of the rolling bearing 1 with a seal ring is ensured by preventing an increase in abrasion due to foreign matter in a contact portion with the rolling surface of the rolling bearing 1.

[0005]

When the conventional rolling bearing 1 with a seal ring shown in FIG. 4 is used for a portion for supporting a rotating shaft of a drive system of a vehicle such as a propeller shaft or a constant velocity joint, the running of the vehicle is reduced. The muddy water and the like that the wheels jumped up along with the inner peripheral edges of the seal lips 11
It is directly applied to the sliding contact portion with the surface of 0 or 10. For this reason, the effect of the seal rings 6 and 6 for preventing intrusion of foreign matter such as muddy water into the space 14 is limited, and conditions are severe such that a car travels at high speed for a long time in rainy weather. In such a case, there is a possibility that the foreign matter cannot be sufficiently prevented from entering. In view of the above circumstances, the present invention has been made to realize a rolling bearing with a seal ring which can prevent muddy water from entering the space for a long time.

[0006]

A rolling bearing with a seal ring according to the present invention has an outer ring raceway on the inner peripheral surface, which does not rotate during use, similarly to the above-mentioned conventional rolling bearing with a seal ring. An inner ring that has an inner ring raceway on the outer peripheral surface and rotates during use, a plurality of rolling elements that are freely rolled between the outer ring raceway and the inner ring raceway, and an elastic material that is reinforced by a core metal And a pair of seal rings whose outer peripheral edges are locked to the inner peripheral surfaces of both ends of the outer ring over the entire circumference.

In particular, the rolling bearing with a seal ring of the present invention has a pair of slinger. Each of the slinger is formed by bending a metal plate to have an L-shaped cross section having a circular ring portion and a cylindrical portion formed on an inner peripheral edge of the circular ring portion, and the entire ring shape is annular. Then, with the circular ring portion positioned axially outside the seal rings and the cylindrical portion positioned diametrically inside the seal rings, the cylindrical portion is positioned at the outer peripheral surfaces at both ends of the inner ring. And the outer peripheral edges of the annular portion are brought close to the surfaces of both ends of the outer ring, respectively. Further, the leading edge of at least one seal lip provided on the inner peripheral edge portion of each of the seal rings over the entire circumference is attached to at least one of the outer peripheral surface of the cylindrical portion of each of the slinger and the inner surface of the circular ring portion. Slidably over the entire circumference.

[0008]

In the rolling bearing with a seal ring of the present invention constructed as described above, the sliding contact between the leading edge of each seal lip and the slinger is covered by the slinger. Therefore, foreign matter such as muddy water does not directly hit the sliding contact portion. Moreover, since the slinger rotates with the inner ring during use, foreign matter such as muddy water attached to the slinger is shaken off by centrifugal force and does not enter the inside of the slinger. As a result, the amount of muddy water that reaches the tip edge of the seal lip is slightly suppressed, and the entry of foreign matter into the space existing between the pair of seal rings can be effectively prevented for a long time. . Moreover, in the case of the rolling bearing with a seal ring of the present invention, since the cylindrical portion constituting each of the above-mentioned slinger is arranged inside the above-mentioned seal ring in the diameter direction, the shaft of the installation space between these slinger and the seal ring is arranged. The dimension in the direction does not increase. Therefore, even with a small rolling bearing with a seal ring having only a limited axial dimension, a sufficient sealing effect can be obtained.

[0009]

FIG. 1 shows a first embodiment of the present invention corresponding to claim 1. A rolling bearing 1a with a seal ring according to the present embodiment has an outer ring 2 and an inner ring 3 which are concentrically arranged with each other, a ball 4 as a rolling element, and a holding member, similarly to the conventional rolling bearing 1 with a seal ring shown in FIG. Vessel 5
And a pair of seal rings 6a, 6a. Each of these seal rings 6a, 6a is a ring-shaped core 1
2 and an elastic material 13 such as an elastomer such as rubber,
The whole is formed in a ring shape. Each of such seal rings 6a, 6a has a locking groove 9, 9 in which the outer peripheral edge of each elastic member 13 is formed at both axial ends of the inner peripheral surface of the outer ring 2.
And supported and fixed to the inner peripheral surfaces of both ends of the outer race 2.

Further, in the case of the rolling bearing with a seal ring according to the present invention, a pair of slinger 15 is provided. Each of these slinger 15 and 15 is formed by bending a corrosion-resistant metal plate such as a stainless steel plate or a galvanized steel plate to have an L-shaped cross section and an annular shape.
6 and 16 and cylindrical portions 17, 17 formed on the inner peripheral edge of the ring portions 16, 16. Each such slinger 1
The cylindrical portions 1 and 5 are arranged such that the respective annular portions 16 and 16 are disposed axially outside the respective seal rings 6a and 6a.
7 and 17 are externally fitted and fixed to both ends of the outer peripheral surface of the inner ring 3 in a state where they are respectively positioned on the inner side in the diameter direction of the seal rings 6a and 6a.

For this purpose, at both ends of the outer peripheral surface of the inner ring 3,
Each has a cylindrical surface portion 18. The cylindrical portions 17, 17 of the slinger 15, 15 are externally fitted and fixed to the cylindrical surface portions 18, 18 by tight fitting with their respective leading edges directed toward the axial center of the inner ring 3. . Further, in this state, the outer peripheral edges of the annular portions 16, 16 of the respective slinger 15, 15 are brought closer to the inner peripheral surfaces of both ends of the outer ring 2, respectively. Therefore, annular labyrinth gaps 19 exist between the inner peripheral surfaces of both ends of the outer ring 2 and the outer peripheral edges of the slinger 15, 15.

Further, the inner peripheral edge of each of the seal rings 6a, 6a has a forked seal lip 11a, 11a.
Is provided over the entire circumference. The tip edges (inner peripheral edges) of these seal lips 11a, 11a are brought into sliding contact with the outer peripheral surfaces of the cylindrical portions 17, 17 of the slinger 15, 15 over the entire circumference.

When, for example, the propeller shaft is rotatably supported under the floor of an automobile by the rolling bearing 1a with the seal ring of the present invention configured as described above, the outer ring 2 is supported and fixed to a mount supported under the floor. The inner ring 3 is externally fitted and fixed to the propeller shaft. When the automobile is running, the inner ring 3 rotates together with the propeller shaft.
During running on rainy weather, muddy water or the like which the wheels roll up splashes on the rolling bearing 1a with a seal ring. In the case of the rolling bearing 1a with a seal ring of the present invention, a good seal is provided over a long period of time for the following reasons. Performance can be maintained.

That is, in the case of the rolling bearing 1a with a seal ring according to the present invention, the distal end edges of the seal lips 11a, 11a and the cylindrical portion 1 forming the slinger 15, 15 are formed.
The sliding contact portions of the outer peripheral surfaces of the slingers 7 and 17 are both slinger 1
It is covered by 5 and 15. Further, these sliding contact portions and the external space are communicated only with the labyrinth gaps 19, 19. For this reason, foreign matter such as muddy water, which is rolled up and sprinkled on the rolling bearing with seal ring 1a, does not directly hit each of these sliding contact portions. In addition, since the slinger 15 and 15 rotate together with the inner ring 3 during use, foreign matter adhering to the slinger 15 and
The slinger 15, 15 is shaken off by centrifugal force.
Of the seal ring 6a, 6a. As a result, the seal lips 11a, 11
a, the amount of muddy water reaching the sliding contact portion between the leading edge of a and the outer peripheral surface of each of the cylindrical portions 17, 17 is slightly suppressed, and into the space existing between the pair of seal rings 6a, 6a. Can be effectively prevented from entering for a long time.

In addition, in the case of the rolling bearing 1a with a seal ring of the present invention, the cylindrical portions 17, 17 constituting the respective slinger 15, 15 are arranged inside the respective seal rings 6a, 6a in the diameter direction. So these slinger 1
There is no increase in the axial dimension of the installation space between the seals 5 and 15 and the seal rings 6a and 6a. Therefore, even with a small rolling bearing with a seal ring having only a limited axial dimension, a sufficient sealing effect can be obtained.

FIG. 2 shows a second embodiment of the present invention.
An example is shown. In the case of this example, each seal ring 6
seal lips 11a, 11 provided on the inner peripheral edges of b, 6b
In addition to a, seal lips 11b, 11b are also provided at diametrically intermediate positions on the outer surface. Then, the leading edges of these seal lips 11b, 11b are
5 are slidably contacted on the inner surfaces of the annular portions 16, 16 over the entire circumference.

In the case of this embodiment as described above, even a small foreign matter that has entered the inside of each of the slinger 15, 15 through the labyrinth gap 19, 19 can be used for the sealing lip 11b,
It is blocked by 11b and does not enter any further.
As a result, a sliding contact portion between the leading edge of each seal lip 11a provided on the inner peripheral edge of each seal ring 6b and the outer peripheral surface of each cylindrical portion 17 constituting each slinger 15 is provided. , The amount of muddy water reaching the space between the pair of seal rings 6b, 6b can be effectively prevented over a long period of time. Other configurations and operations are the same as those of the above-described first example.

Next, FIG. 3 shows a third embodiment of the present invention.
An example is shown. In the case of this example, each seal ring 6
a, seal lips 11a, 11 provided on the inner peripheral edge of 6a
In addition to a, a ring portion 16, which constitutes the slinger 15, 15,
At the diametrically intermediate position on the inner surface of the lip 16, lip portions 21, 21 made of synthetic resin are provided over the entire circumference. Each of these lip portions 21 and 21 is inclined in a direction outward in the diametrical direction toward the leading edge. Then, the leading edge of each of these lip portions 21, 21 is connected to each of the above-mentioned seal rings 6a, 6
The outer surface a is closely opposed to an intermediate portion in the diameter direction. Therefore, the second labyrinth gaps 20, 20 for forming a labyrinth seal are provided between the leading edge of each of the lip portions 21, 21 and the diametrically intermediate portion of the outer surface of each of the seal rings 6a, 6a. Exists.

In the case of the present embodiment, even a small foreign matter that has entered the inside of each of the slinger 15 through the labyrinth gap 19, the second labyrinth gap 2
It cannot pass through 0 and 20 and does not penetrate any further. As a result, the tip edges of the seal lips 11a provided on the inner peripheral edge of the seal rings 6a, 6a, and the cylindrical portions 17, 1 constituting the slinger 15, 15 are formed.
The amount of muddy water reaching the sliding contact portion with the outer peripheral surface of the outer ring 7 is extremely small, and foreign matter can be prevented from entering the space existing between the pair of seal rings 6a for a long time. Can be more effectively prevented. In particular, the second labyrinth gap 2
Since the lip portions 21 and 21 that constitute 0 and 20 are not in contact with the seal rings 6a and 6a, the rotational torque of the rolling bearing with the seal ring can be reduced. Other configurations and operations are the same as those of the above-described second example.

[0020]

The rolling bearing with a seal ring of the present invention
Since it is configured and operates as described above, excellent durability and reliability can be ensured even under severe use conditions such as provided under the floor of an automobile.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a half sectional view showing the second example.

FIG. 3 is a half sectional view showing the third example.

FIG. 4 is a half sectional view showing one example of a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Rolling bearing with seal ring 2 Outer ring 3 Inner ring 4 Ball 5 Cage 6, 6a, 6b Seal ring 7 Outer ring raceway 8 Inner ring raceway 9 Locking groove 10 Concave groove 11, 11a, 11b Seal lip 12 Core metal 13 Elastic material 14 space 15 slinger 16 circular ring part 17 cylindrical part 18 cylindrical surface part 19 labyrinth gap 20 second labyrinth gap 21 lip part

Continued on the front page (72) Inventor Kenji Arai 1-5-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa F-term in NSK Ltd. (reference) 3J006 AE16 AE19 AE23 AE45 3J016 AA02 BB03 BB04 BB16 CA02 CA06

Claims (2)

[Claims] 1. An outer race having an outer raceway on an inner peripheral surface and not rotating even when used, an inner race having an inner raceway on an outer peripheral surface and rotating during use, and a roll between the outer raceway and the inner raceway. A plurality of rolling elements provided movably, and an elastic material is reinforced by a core metal to form a whole ring shape, and the outer peripheral edge is formed on the inner peripheral surface at both ends of the outer ring over the entire circumference. In a rolling bearing with a seal ring having a pair of locked seal rings, an L-shaped cross section having a circular ring portion and a cylindrical portion formed on the inner peripheral edge of the circular ring portion by bending a metal plate. In the state where the whole is formed in an annular shape, the annular portion is positioned axially outside the seal rings, and the cylindrical portion is positioned diametrically inward of the seal rings, the cylindrical portion is positioned above the seal ring. The outer ring is fixed to the outer peripheral surfaces at both ends of the inner ring, and It has a pair of slinger whose outer peripheral edge portions of the ring portion are brought close to both end surfaces of the outer ring, respectively, and the leading edge of at least one seal lip provided on the inner peripheral edge portion of each of the seal rings over the entire circumference. A rolling bearing with a seal ring, characterized in that at least one of the outer peripheral surface of the cylindrical portion and the inner surface of the circular ring portion of each slinger is slid over the entire circumference. 2. At least one lip is provided on the inner surface of each slinger over the entire circumference, and the leading edge of the lip is brought close to the outer surface of each seal ring over the entire circumference,
The rolling bearing with a seal ring according to claim 1, wherein a labyrinth seal is provided between each of the inner side surfaces and each of the outer side surfaces.