JP2556661Y2 - Rolling bearing for roll neck of rolling mill - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a rolling bearing mounted on a roll neck of a rolling mill.

[0002]

2. Description of the Related Art FIG. 2 shows a rolling bearing (30) for a roll neck of a conventional rolling mill. The bearing (30) is fitted to the roll neck (32) with a loose hook gap (33) so that the bearing can easily be pulled out of the roll neck (32) during maintenance such as roll replacement. Therefore, the inner diameter surface of the inner ring (34) and the outer diameter surface of the roll neck (32) are liable to wear due to fretting or creep. In order to prevent this, a lubricant such as grease is usually supplied from the outside of the bearing to the gap (33) through the greasing passage (35) provided in the center of the bearing (30).

[0003]

In recent years, roll neck rolling bearings tend to be used under severe conditions such as high temperature and high load. When the operating conditions are severe in this way, lubrication between the inner ring (34) and the roll neck (32) becomes insufficient only with the lubricant supplied to the gap (33), and the inner surface (34) of the inner ring (34) Fretting may occur on the outer diameter surface of the roll neck (32).

In general, the rolling bearing (30) for a roll neck is clamped at both ends by a positioning member, for example, a shoulder (36) of the roll neck (32) and a collar (37), and is placed on the roll neck (32). Is positioned. Therefore, under the above-mentioned severe conditions, lubrication of the end face of the shoulder portion (36), the outer end face of the inner ring (34), and the inner ring side end face of the collar (37) becomes insufficient. Fretting may occur on the end face.

Accordingly, the present invention provides a rolling bearing for a roll neck of a rolling mill which can reliably lubricate between the inner race and the roll neck and between the end face of the inner race and the end face of the positioning member even under severe use conditions. The purpose is to provide.

[0006]

In order to achieve the above object,
The present invention has an inner ring which is fitted to a roll neck of a rolling mill with a loose hook gap and is positioned by being sandwiched and positioned by a pair of positioning members provided on the roll neck. In a rolling bearing for a roll neck, a lubricating film formed by dispersing molybdenum disulfide and graphite in a thermosetting binder was formed on the inner surface of the inner ring and the end surface in contact with the positioning member.

[0007]

The lubricating coating obtained by dispersing molybdenum disulfide and graphite in a thermosetting binder exhibits excellent lubricating performance even under severe conditions such as high temperature and high load. Therefore, by forming this lubricating coating on the inner diameter surface of the inner ring, the shortage of the lubricant supplied to the gaps due to the self-lubricating action is compensated. This ensures reliable lubrication between the inner ring and the roll neck.

Further, by forming a lubricating film on the end surface of the inner ring which comes into contact with the positioning member, good lubrication can be performed at the contact portion. In addition, this lubricating coating
It also has the effect of blocking the lubricant flowing out of the contact portion. As a result, a large amount of lubricant is stored in the gap between the inner ring and the roll neck, so that the lubrication between the inner ring and the roll neck is more reliably performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

The roll neck rolling bearing (1) has two inner races (4) fitted to the roll neck (2) with a loose hook gap (3) and four outer races (5) fitted to a housing (not shown). ), A plurality of tapered rollers (6) incorporated between the inner and outer rings (4) and (5), a cage (7) for holding the tapered rollers (6) at equal circumferential intervals, and ends of the outer ring (5) The oil seal (8) mounted on the main component is a main component.
The inner ring (4) is provided with a shoulder (9) of a roll neck (2).
And the collar (1) attached to the end of the roll neck (2)
0) and positioned.

An outer diameter side passageway (16) provided between a pair of outer ring spacers (15) is provided at a central portion of the rolling bearing (1), and a pair of outer diameter passages (15) mounted on an inner diameter portion of the outer ring spacer (15). Seal member (1
7) A series of greasing passages (21) consisting of an intermediate passage (18) provided between them and an inner diameter side passage (20) provided in the inner ring spacer (19).
The greasing passage (21) communicates with a greasing port (not shown) provided in the housing.
A spiral groove (23) is formed on the inner diameter surface (22) of the inner ring (4) to allow the lubricant supplied from the greasing passage (21) to flow through the entire area of the gap (3).

The present invention is characterized in that a lubricating coating (25) is formed on the inner diameter surface and the outer end surface of both inner rings (4). This lubricating film (25) is to be formed with a lubricant of a type in which molybdenum disulfide and ultrafine graphite are dispersed in a binder made of a thermosetting resin (for example, Nippon Acheson Co., Ltd .: trade name Moridac 250). Apply to the surface with a spray, etc., and then dry it to a film thickness of 10 to 30 m
It is a dry film of a degree, and exhibits excellent lubrication performance even under high temperature and high load. In FIG. 1, the thickness of the lubricating film (25) and the size of the gap (3) are exaggerated.

As described above, by forming the lubricating film (25) having self-lubricating properties on the inner diameter surface (22) of the inner ring (4), the amount of the lubricant supplied to the gap (3) is insufficient. Also in this case, lubrication between the inner race (4) and the roll neck (2) is ensured.

Further, by forming a lubricating film (25) on the outer end surface of the inner ring (4), it is ensured between the end surface of the shoulder (9) and the end surface of the collar (10) that comes into contact with the lubricating film. Lubrication will be provided. In addition, this lubricating coating (25)
Has the effect of blocking the lubricant flowing out from the contact surfaces of the shoulder (9), the inner ring (4), and the collar (10).
A large amount of lubricant is stored by the gap (3). Therefore, the lubrication between the inner ring (4) and the roll neck (2) is further ensured.

[0015]

[Effects of the Invention] As described above, according to the present invention,
Reliable lubrication is provided between the inner race and the roll neck, and between the end surfaces of the inner race and the positioning member that are in contact with each other. Therefore, even under severe use conditions such as high temperature and high load, fretting does not occur and the desired bearing performance can be maintained for a long period of time.

[Brief description of the drawings]

FIG. 1A is a sectional view showing an embodiment of the present invention, and FIG.

FIG. 2 is a sectional view of a conventional roll neck rolling bearing.

[Description of Signs] 1 Roll Neck Rolling Bearing 2 Roll Neck 3 Saddle Eye Gap 4 Inner Ring 9 Positioning Member (Shoulder) 10 Positioning Member (Color) 25 Lubricating Coating

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner ring which is fitted to a roll neck of a rolling mill with a loose hook gap and is positioned by being sandwiched and positioned by a pair of positioning members provided on the roll neck. The rolling bearing for a roll neck, wherein a lubricating film formed by dispersing molybdenum disulfide and graphite in a thermosetting binder is formed on an inner diameter surface of the inner ring and an end surface in contact with the positioning member. Rolling bearing for roll neck of rolling mill.