JP2002139053A - Bearing for rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing for rolling mill capable of supplying grease easily at the time of maintenance, etc., without boring a thin chock with any L-form or T-form crosswise hole for greasing nor boring an outer ring spacer with any hole for greasing. SOLUTION: A recess 2c is formed at the inside of the inner ring 2a of this bearing for rolling mill, and there a hole 2d for supplying a lubricating grease is provided. Otherwise a recess is formed at the inside surface of an inner ring spacer 6 installed between the inner ring 2a and inner ring 2a, and a hole for supplying lubricating grease is provided therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing for a rolling mill used for supporting a roll neck of a rolling mill, and in particular, it is possible to attach a nipple for supplying oil even if the housing has a thin wall. The present invention relates to a rolling mill bearing.

[0002]

2. Description of the Related Art Rolls used in rolling mills use bearings to support both ends. The bearing is installed in the housing and supports the roll neck of the mill roll. For example, as shown in FIG. 3, an outer ring 21, 21 and an inner ring 2
2, a bearing 20 composed of a tapered roller 23, a cage 24 and the like is arranged, and a roll neck (not shown) is fitted into the inner peripheral surfaces of the inner rings 22, 22 to support the inner ring.

[0003] The above-described bearing 20 for a rolling mill is used in a relatively dusty and relatively high temperature environment and uses a large amount of water for cooling, so that intrusion of moisture and dust is prevented. A seal holding ring 27 is arranged at the end of the bearing, and a seal 28 is arranged between the seal holding ring 27 and an extended portion 22b having the inner ring 22 elongated outside. In order to lubricate the bearing 20, an L-shaped lubrication passage 29 is formed from the side surface of the chock H, from which grease is injected. Further, the bearing 20 has an outer ring 21.
An outer ring spacer 25 having a grease supply hole 25 a is disposed between the outer ring 21 and the outer ring 21 so that the grease supplied from the lubrication passage 29 can sufficiently spread into the bearing 20. During the use of the rolling mill, the lubrication passage 2 of the housing H is used.
9 is sealed with a stopper, and a grease nipple 12 is used when lubricating grease is injected.

As a bearing for supporting a roll neck, as shown in FIG.
A bearing 30 including an outer ring 31, an inner ring 32, and rollers 33, 33 is arranged, and the outer ring 31 and the outer ring 31 are arranged.
Between them, a T-shaped lubrication passage 38, 39 which can be greased from both the side surface and the outer peripheral surface of the housing (chock) H is provided. In this case, a groove 34 is provided in the lateral direction on the inner peripheral surface of the housing (chock) H so that the grease can be distributed to the outer races 31 and 31 (Japanese Patent Publication No. Sho 56-3).
No. 8804).

[0005]

As described above, usually, as described above,
In a roll neck support bearing, L
G-shaped greasing holes (29) and T-shaped greasing holes (38,3)
Since 9) is drilled, the processing is complicated. When lubricating the bearing with grease, the outer ring spacer (25, 35, etc.)
The greasing work is performed by removing the roll from the chock and piping the grease nipple attached to the chock end face or the outer peripheral face during maintenance such as re-grinding the roll for a rolling mill. However, there are cases where the thickness of the chock is thin, the case where the greasing hole cannot be formed due to the configuration of the rolls, and the case where greasing is extremely inconvenient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has an L-shaped or T-shaped horizontal hole for lubrication in a thin chock, and an outer ring spacer. It is an object of the present invention to provide a rolling mill bearing that can easily supply grease during maintenance or the like without drilling a grease hole.

[0007]

That is, the present invention as a means for solving the above-mentioned problems, according to the first aspect of the present invention, has an outer ring fitted into a housing and a roll neck fitted on an inner peripheral surface. An inner ring to be inserted, a rolling element disposed between the outer and inner rings, a retainer for holding the rolling element, an outer ring spacer disposed between the outer rings, and an inner ring spacer disposed between the inner rings. In a rolling bearing, a rolling seal is provided, wherein a sealing seal is arranged between an outer annular portion extending axially outward at both ends of the inner ring and a seal retaining ring disposed adjacent to the outer ring outside. A recess is formed in the inner peripheral surface of the inner ring, and a lubrication hole is formed in the recess.

The invention according to claim 2 is characterized in that a recess is formed in the inner peripheral surface of the inner ring spacer, and a lubrication hole is formed in the recess.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial longitudinal sectional view of a rolling mill bearing of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. This rolling mill bearing 10
The outer ring 1, the inner ring 2, the tapered rollers 3 of the rolling elements, the retainer 4 for holding the tapered rollers 3, the outer ring spacer 5, the inner ring spacer 6, the seal 8, and the seal 8 And a seal holding ring 7 for holding. And the outer ring 1
Is composed of a double-row outer ring 1a in which double-row rollers 3 are arranged, and outer races 1b, 1b in which a single-row roller 3 is arranged. The inner ring 2 has double-row rollers 3,3 arranged therein. Inner ring 2a, 2a
It consists of. The outer race spacers 5, 5 are disposed between the outer race 1a and the left and right outer races 1b, 1b.
Is disposed between the inner ring 2a and the inner ring 2a, and an O-ring for sealing is fitted in the inner ring spacer 6.

The inner races 2a, 2a are respectively formed with outer annular portions 2b, 2b extending outward. Then, seals 8, 8 are arranged between the outer annular portions 2b, 2b and the seal holding rings 7, 7. The outer rings 1a, 1b, 1b and the seal holding ring 7,
7 is disposed in a housing (chopper) not shown,
A roll neck of a rolling roll (not shown) is fitted into the inner peripheral surfaces of the inner rings 2a, 2a. A groove is provided in the outer periphery of the seal holding rings 7, 7, and O-rings 9, 9 are fitted therein to seal the space between the housing and the housing.

Next, as shown in FIG. 2, a recess 2c is formed in the inner rings 2a and 2a, and a hole 2d for lubricating oil is provided. The lubrication hole 2d is
And a bearing space 11 between the inner ring 5 and the outer ring spacer 5, and a female screw is provided inside (inside the inner ring). In this case, the recess 2c is usually processed by an end mill. Further, instead of providing the concave portion 2c, a lubricating hole 2d may be formed at one or a plurality of locations as a circumferential groove from the beginning. The grease nipple 12 is screwed into the lubrication hole 2d from the inside. In this case, the head of the grease nipple 12 does not contact the surface of the roll neck (not shown). It is necessary to provide.

In this manner, the rolling rolls are replaced, the rolls are removed during maintenance, the bearings are inspected,
The grease nipple 12 in the concave portion 2c inside the inner ring 2a
Connect the hose and fill with grease for lubrication. In this case, since it is not necessary to form a lubrication hole or the like in the housing or the like, the processing cost can be reduced.

In the above embodiment, the inner ring 2a
2c (and the lubricating oil lubrication hole 2
d) may be provided at a plurality of locations on one inner ring 2a. Also, in the embodiment of the present invention, the rolling elements of the bearing are described as tapered rollers 3, but they may be ordinary cylindrical rollers. Further, in the above embodiment, the recess 2c is provided on the inner peripheral surface of the inner ring 2a, and the hole 2d for supplying lubricating oil is provided in the recess 2c, but instead of the inner ring 2a, the inner ring spacer 6c is provided.
A concave portion and a lubricating oil lubrication hole may also be provided on the inner peripheral surface of the above.

[0014]

As described above in detail, according to the rolling mill bearing of the present invention, even if the thickness of the housing is thin, it is possible to form an L-shaped or T-shaped side hole in the chock, There is no need to drill a greasing hole in the outer ring spacer, and the processing cost can be reduced. In addition, maintenance becomes easier, and lubrication can be easily performed during maintenance of bearings and rolls. Furthermore, even in a thin housing,
Since there is no need to drill a hole for greasing, there is no need to worry about the strength of the housing.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view of a rolling mill bearing of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partial longitudinal sectional view of a conventional rolling mill bearing.

FIG. 4 is a partial longitudinal sectional view of a conventional rolling mill bearing.

[Explanation of symbols]

 Reference Signs List 1 outer ring 2 inner ring 2c recess 2d lubrication hole 3 tapered roller 4 cage 5 outer ring spacer 6 inner ring spacer 7 seal retaining ring 8 seal 9 O-ring 10 bearing 11 bearing space 12 grease nipple

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuhiko Kato 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Kazuya Fujimoto 3-5-8 Minamisenba, Chuo-ku, Osaka-shi, Osaka F-term in Koyo Seiko Co., Ltd. (reference) 3J101 AA13 AA25 AA32 AA44 AA54 AA62 BA53 BA56 CA01 FA48 GA36

Claims (2)

[Claims] 1. An outer ring fitted into a housing, an inner ring fitted with a roll neck on an inner peripheral surface, a rolling element disposed between the outer and inner rings, and a retainer holding the rolling element,
An outer ring-shaped spacer disposed between the outer rings, and an inner ring spacer disposed between the inner rings; and an outer annular portion extending axially outward at both ends of the inner ring, and adjacent to the outer ring outer side. A rolling mill bearing in which a sealing seal is arranged between the sealing ring and a seal holding ring, wherein a recess is formed in an inner peripheral surface of the inner ring, and a lubrication hole is formed in the recess. And rolling mill bearings. 2. The bearing for a rolling mill according to claim 1, wherein a recess is formed in an inner peripheral surface of the inner ring spacer, and a lubrication hole is formed in the recess.