JP2002195278A - Sealing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed unit capable of easily removing. SOLUTION: The sealing unit 30 is comprised of a seal case 31, which is installed in an outer ring 21 of a bearing 20, having an intermediate diameter portion 31b and a small diameter portion 31c that is smaller than the intermediate diameter portion in diameter, core metal 32 having a cylindrical portion 32a that is installed in an inner peripheral surface of the intermediate diameter portion 31b of the seal case 31, a lip portion 33 installed in the core metal 32, and a partitioning plate 34 having a cylindrical portion 34 that is installed in an inner peripheral surface of the cylindrical portion 32a of the core metal 32. Therefore, when the core metal 34 is pushed out to a direction facing from the intermediate diameter portion 31b to the small diameter portion 31c, engagement between the core metal 32 and seal case 31 can be secured. Thus, the sealing unit 30 including the seal case 31 can be removed from an outer ring 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for suppressing the intrusion of foreign matter into a bearing for rotatably supporting an axle of a railway vehicle, for example.

[0002]

2. Description of the Related Art A bearing device is used to rotatably support, for example, an axle of a railway vehicle. Further, a sealing device is usually provided adjacent to the bearing device so that foreign substances such as dust and water do not enter the inside of the bearing device.

[0003]

By the way, in a railway vehicle, it is necessary to periodically perform maintenance of the bearing device. Therefore, the sealing device that hinders the maintenance of the bearing device needs to be periodically removed. However, the conventional sealing device has a possibility that it takes time to remove it.

[0004] The present invention has been made in view of the problems of the related art, and has as its object to provide a sealing device that can be easily removed.

[0005]

SUMMARY OF THE INVENTION A sealing device according to the present invention is mounted on an outer ring of a bearing, and includes a first cylindrical portion and a second cylindrical portion adjacent to the first cylindrical portion and having a smaller inner diameter than the first cylindrical portion. A metal core having a metal core mounting portion mounted on the inner peripheral surface of the first cylindrical portion of the seal case, a lip mounted on the metal core, and the metal core And a partition plate having a partition plate mounting portion mounted on the inner peripheral surface of the cored bar mounting portion.

[0006]

The sealing device of the present invention is mounted on an outer ring of a bearing, and has a first cylindrical portion and a second cylindrical portion adjacent to the first cylindrical portion and having a smaller inner diameter than the first cylindrical portion. A metal core having a metal core attachment portion attached to the inner peripheral surface of the first cylindrical portion of the seal case, a lip attached to the metal core, and a metal core attachment portion of the metal core. A partition plate having a partition plate mounting portion attached to an inner peripheral surface thereof, so that when the core metal is extruded in a direction from the first cylindrical portion toward the second cylindrical portion, the first Even if the inner diameter difference between the cylindrical portion and the second cylindrical portion is small, the engagement between the core metal and the seal case can be secured,
This makes it possible to remove the sealing device from the outer ring for each of the seal cases.

Further, if the outermost portion in the axial direction of the lip portion (the side opposite to the outer ring) is located inside (the outer ring side) of the outermost portion in the axial direction of the seal case, the lip portion may be disassembled. This is preferable because breakage of the lip can be suppressed.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an axial cross-sectional view of an axle portion 10 of a railway vehicle including the first embodiment. The axle unit 10 includes a shaft 11 on which wheels (not shown) are mounted on the right side in FIG. 1, and a bearing 20 that rotatably supports the shaft 11. Outer ring 21 of bearing 20
Is a configuration fixed to an axle housing or the like of a railway vehicle (not shown).

The bearing 20 includes an outer race 21 and inner races 22A and 22A.
2B, a plurality of rows of tapered rollers 23, 23 rotatable between the outer ring 21 and the inner rings 22A, 22B, and retainers 24, 24 for holding these. On axis 11,
On the wheel side (right side in FIG. 1) of the journal portion 11a, a shaft neck 11b having an enlarged diameter is formed. 11a.

In the shaft 11, the journal portion 11
A front cover 13 is screwed to the free end side (the left side in FIG. 1) of a. The inner rings 22A and 22B of the bearing 20 approach each other through the spacer 15 by tightening the front cover 13. , So that a predetermined clearance is provided in the tapered rollers 23, 23. The front lid 13 is prevented from being loosened by the bolts 14 and the disc 16.

At both ends of the bearing 20 in the axial direction, a rear cover 12 is provided.
And sealing devices 30, 30 arranged radially outward of the spacer 15. In addition, the sealing device 30,
30 have the same configuration except that they are assembled in the opposite direction. Therefore, the sealing device on the right side in FIG. 1 will be described below.

FIG. 2 is an enlarged view of a portion indicated by an arrow II in the configuration of FIG. The sealing device 30 includes a seal case 31 attached to the outer ring 21, a metal core 32,
It comprises a lip 33, a partition plate 34, and a cylindrical member 35 attached to the outer peripheral surface of the rear lid 12.

In FIG. 2, on the inner circumference of the end of the outer race 21,
An enlarged diameter portion 21a is formed, and an inner peripheral groove 21b is formed behind the enlarged diameter portion 21a. The cylindrical seal case 31 has a large diameter portion 31a whose diameter decreases in the following order.
And the intermediate diameter portion 31b and the small diameter portion 31c are directly connected. The middle diameter part 31b constitutes a first cylindrical part, and the small diameter part 31c constitutes a second cylindrical part.

At the free end (left end in FIG. 2) of the large diameter portion 31a of the seal case 31, an outer peripheral projection 31d continuous in the circumferential direction is provided.
Is formed, and the large diameter portion 31a is connected to the enlarged diameter portion 2 of the outer race 21.
1a, the outer peripheral projection 31d is attached to the inner peripheral groove 21b.
, The careless escape of the seal case 31 from the outer ring 21 is suppressed.

A cylindrical portion (core bar mounting portion) 32a of a core bar 32 is press-fitted into the inner periphery of the middle diameter portion 31b of the seal case 31 by press fitting. A flange portion 32b is formed so as to extend inward in the radial direction from the right end in FIG. 2 of the cylindrical portion 32a of the metal core 32. A lip 33 is attached to the inner edge of the flange 32b. FIG.
As shown in FIG. 3, the lip portion 33 includes a main lip portion 33a that is radially inward and extends toward the bearing 20 and a sub lip that is radially inward and extends on the opposite side to the bearing 20. It has a portion 33b and a side lip portion 33c extending radially outward and on the side opposite to the bearing 20.

In the present embodiment, the sub lip 33
2 is in contact with the outer peripheral surface of the cylindrical member 35 having a substantially J-shaped cross section shown in FIG. 2, and the main lip portion 33a and the side lip portion 33c are separated from the cylindrical member 35, so-called labyrinth seals. Is formed. The lip 3
3, the sub-lip 33b protrudes most outward in the axial direction (to the right in FIG. 2). However, the end of the sub-lip 33b is still the end of the small-diameter portion 31c of the seal case 31. Is disposed on the inner side (on the bearing 20 side) by a distance Δ.

A cylindrical portion (partition plate mounting portion) 34a of a partition plate 34 is fitted into the inner periphery of the cylindrical portion 32a of the cored bar 32 by press fitting. The partition 34b is formed so as to extend radially inward and axially toward the bearing 20 from the left end of the cylindrical portion 34a of the partition 34 in FIG. The inner edge of the partition part 34b forms a non-contact type seal so as to be slightly spaced from the outer peripheral surface of the inner ring 22B.

In FIG. 2, the inner ring 22B of the bearing 20 and the rear lid 12 (and the cylindrical member 35) rotate with the rotation of the shaft 11 (FIG. 1) during running of the railway vehicle. The seal case 31 attached to the outer ring 21 is stationary, and the sub lip 3 of the lip 33
3b comes into contact with the outer peripheral surface of the rotating cylindrical member 35, thereby preventing the intrusion of foreign matter from the outside.
The non-contact sealing effect of 3a, the side lip portion 33b, and the partition portion 34b of the partition plate 34 prevents entry of foreign matter from the outside.

Here, it is necessary to remove the sealing device 30 from the bearing 20 for maintenance of the bearing 20 or the like.
Such a case will be described by comparing the present embodiment with a comparative example. FIG. 3 is a diagram similar to FIG. 2 showing a comparative example. In this comparative example, in the configuration of the sealing device 30 ′, the cylindrical portion 34 a of the partition plate 34 is fitted to the inner periphery of the middle diameter portion 31 b ′ of the seal case 31 ′, and the core metal is attached to the inner periphery of the cylindrical portion 34 a. 32 that the cylindrical portion 32a is fitted;
The only difference is that the small-diameter portion 31c 'of the seal case 31' is short in the axial direction, and the sub-lip portion 33c of the lip portion 33 projects rightward in FIG.

From the bearing 20, the sealing device 3 of the present embodiment
In order to remove 0, a removal jig (not shown) is applied to the side surface of the bearing 20 of the flange portion 32b of the metal core 32 and is pushed rightward in FIG. Thereby, the flange portion 32b of the cored bar 32
Is caught on the small-diameter portion 31c of the seal case 31, so that the jig is further pushed out from this state, so that the metal core 3
2, the partition plate 34, and the seal case 31
It can be separated from the outer ring 21.

In the case of the comparative example shown in FIG. 3, the cylindrical portion 32a of the cored bar 32 is
Therefore, when the removal jig (not shown) is applied to the side of the bearing 20 of the flange portion 32b of the metal core 32 and is pushed rightward in FIG. There is a possibility that the flange portion 32b does not catch on the small-diameter portion 31c of the seal case 31 and comes off as it is. Core 3
If 2 comes off, in order to remove the sealing device 30, another operation such as making a hole in the seal case 31 and pulling the seal case 31 is required, which takes more time and effort. On the other hand, in order to prevent the core bar 32 from coming off, it is conceivable to make the inner diameter of the small diameter portion 31c 'smaller, but this limits the design of the lip cross section.

As described above, according to the present embodiment, the cylindrical portion 32 a of the cored bar 32 is attached to the middle diameter portion 31 of the seal case 31.
Since it is directly attached to the inner peripheral surface of b, by pushing out the core bar 32, engagement with the small diameter portion 31c is generated, and the sealing device 30 can be easily separated.

Further, according to the present embodiment, the lip portion 3 is located closer to the axial end of the seal case 31 (the right end in FIG. 2).
Since the axial end (the right end in FIG. 2) of the third sub lip 33b is disposed inward (the bearing 20 side) by the distance Δ,
In a state where the sealing device 30 is removed and the small-diameter portion 31c side of the seal case 31 is placed on a floor or the like, the entire lip portion 33 including the sub lip portion 33b does not contact the floor. Inadvertent breakage of the lip portion 33 can be suppressed.

FIG. 4 is a view similar to FIG. 2 according to the second embodiment. The embodiment shown in FIG. 4 is different from the embodiment shown in FIG. 2 only in the shape of the partition plate. Omitted. In FIG. 4, the partition plate 134 of the sealing device 130 extends radially inward from the cylindrical member 134 and forms a partition portion 134 b whose inner edge is close to the cylindrical member 35.

FIG. 5 is a view similar to FIG. 2 according to the third embodiment. The embodiment shown in FIG. 5 is different from the embodiment shown in FIG. 2 only in the configuration of the lip portion. Omitted. In FIG. 5, the lip 233 of the sealing device 230 does not make the main lip 233a lightly contact the cylindrical member 35, but makes the sub lip 233b non-contact.

FIG. 6 is a view similar to FIG. 2 according to the fourth embodiment. The embodiment shown in FIG. 6 is different from the embodiment shown in FIG. 2 only in the shape of the partition plate and the configuration of the lip portion. And description thereof is omitted. 6, the partition plate 134 of the sealing device 330 extends radially inward from the cylindrical member 134 to form a partition portion 134b whose inner edge is close to the cylindrical member 35.
In addition, the lip portion 233 connects the main lip 233a to the cylindrical member 3.
5 instead of making light contact with
b is non-contact.

FIG. 7 is a view similar to FIG. 2 according to the fifth embodiment. The embodiment shown in FIG. 7 is different from the embodiment shown in FIG. 2 only in the configuration of the lip portion. Omitted. 7, the lip 333 of the sealing device 430 makes the main lip 333a lightly contact the cylindrical member 35, and the sub lip 333
b is also in contact with the cylindrical member 35.

FIG. 8 is a view similar to FIG. 2 according to the sixth embodiment. The embodiment shown in FIG. 8 differs from the embodiment shown in FIG. 2 only in the shape of the partition plate and the configuration of the lip portion. And description thereof is omitted. 8, the partition plate 134 of the sealing device 530 extends radially inward from the cylindrical member 134 to form a partition portion 134b whose inner edge is close to the cylindrical member 35.
The lip 333 is formed by connecting the main lip 333a to the cylindrical member 3.
5, and the sub lip 333b is also in contact with the cylindrical member 35.

Although the present invention has been described with reference to the embodiment, it should be understood that the present invention should not be construed as being limited to the above-described embodiment, and that modifications and improvements can be made as appropriate. is there. For example, rolling elements are not limited to tapered rollers,
It may be a cylindrical roller.

[0030]

The sealing device of the present invention is attached to the outer ring of a bearing, and has a first cylindrical portion and a second cylindrical portion adjacent to the first cylindrical portion and having a smaller inner diameter than the first cylindrical portion. A seal case, a metal core having a metal core mounting portion mounted on an inner peripheral surface of the first cylindrical portion of the seal case, a lip portion mounted on the metal core, and a metal core mounting of the metal core When the core metal is extruded in a direction from the first cylindrical portion to the second cylindrical portion, the partition plate includes a partition plate having a partition plate attaching portion attached to the inner peripheral surface of the portion. Even when the inner diameters of the first cylindrical portion and the second cylindrical portion are small, the engagement between the cored bar and the seal case can be ensured, whereby the sealing device is removed from the outer ring for each seal case. It becomes possible.

[Brief description of the drawings]

FIG. 1 is an axle section 10 of a railway vehicle including a first embodiment.
3 is an axial sectional view of FIG.

FIG. 2 is an enlarged view showing a portion indicated by an arrow II in the configuration of FIG. 1;

FIG. 3 is a view similar to FIG. 2 showing a comparative example.

FIG. 4 is a view similar to FIG. 2 according to a second embodiment.

FIG. 5 is a view similar to FIG. 2 according to a third embodiment.

FIG. 6 is a view similar to FIG. 2 according to a fourth embodiment;

FIG. 7 is a diagram similar to FIG. 2 according to a fifth embodiment.

FIG. 8 is a diagram similar to FIG. 2 according to a sixth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Shaft 20 Bearing 21 Outer ring 22A, 22B Inner ring 23 Tapered roller 24 Cage 30, 130, 230, 330, 430, 530 Sealing device

Claims (1)

[Claims] 1. A seal case attached to an outer ring of a bearing, the seal case including a first cylindrical portion, and a second cylindrical portion adjacent to the first cylindrical portion and having a smaller inner diameter than the first cylindrical portion; A metal core having a metal core mounting portion mounted on an inner peripheral surface of the first cylindrical portion, a lip portion mounted on the metal core, and an inner peripheral surface of the metal core mounting portion of the metal core And a partition plate having a partition plate mounting portion.