JPS61262409A - Roll bearing for rolling mill - Google Patents

Abstract

PURPOSE:To smooth the fit between a roll and the inner ring of a roll bearing and to prevent the creep in a contact part by supplying a lubricating oil between the roll and the inner ring of the roll bearing. CONSTITUTION:An oil feed hole is provided from the side face B of a bearing box 2 toward the inside of the box 2 and further the oil feed hole is provided to a keep plate 5 as well so that the lubricating oil fed from the side face B is advanced in an arrow direction and is passed between an oil seal 7 and oil seal 10 bolted 8 to the plate 5. The lubricating oil passes through a groove C provided to the inner ring of the sealed bearing 3 and flows toward the circumferential surface of the roll 1 from which the oil is conducted to the contact surface A between the roll 1 and the inside ring of the bearing 3. An oil groove 3 is provided to the inside ring of the bearing 3 to permit the easy flow of the lubricating oil in the axial length direction of the roll 1. The lubrication between the roll 1 and the inside ring of the bearing 3 from the outside of the box 2 is thus improved by such constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to roll bearings of rolling mills. It provides good lubrication.

[Background of the invention]

Conventionally, the lubricating force between the work roll and the inner ring of the bearing was determined by providing a greasing hole in the longitudinal direction of the roll from the center of the roll shaft end, as described in Japanese Patent Application Laid-open No. 49-4660. This is a method of providing greasing holes that intersect at right angles at desired positions and in the same direction.The lubricating oil supplied from the center of the roll shaft end is forced to enter the interior one by one due to the pressure of the lubricating oil supplied one after another. Grease is supplied between the work roll and the inner ring of the bearing. There is a slight gap between the work roll and the inner ring of the bearing, and this gap is the width of the inner ring of the bearing in the longitudinal direction of the roll shaft. The lubricating oil is sequentially lubricated in the circumferential direction because the circumferential speed of the roll and the bearing inner ring becomes slightly different due to the spacing caused by the gap between the roll and the bearing inner ring.

[Purpose of the invention]

An object of the present invention is to provide a roll bearing for a rolling mill that smooths the fit between the roll and the inner ring of the roll bearing and prevents creep in the contact area by supplying lubricating oil between the roll and the inner ring of the roll bearing. Our goal is to provide the following.

[Summary of the invention]

The gist of the present invention is to provide a greasing hole in the bearing box and the bearing outer ring,
In addition, an oil seal is attached to the outer ring of the bearing to prevent lubricating oil from leaking to the outside.

[Embodiments of the invention]

A preferred example of the present invention will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows a roll bearing of a rolling mill.

Power for driving the roll 1 from the electric motor (not shown) K is transmitted to the roll 1vc via the drive shaft 6. The roll 1 is supported by a sealed bearing 3 and a sealed bearing 4vc, and the sealed bearings 3 and 4 are housed in a bearing box 2. In the case of a roll neck bearing that uses Sealed Bearing 3, the grease inside the bearing itself is sealed with a seal, so grease cannot be supplied to the outside of the bearing, between the bearing inner ring and the rolls, resulting in long machining of the rolls. However, according to the present invention, by providing a greasing hole B in the pressing plate 5 that holds the bearing box 2 and the sealed bearing 3, the roll 1 This eliminates the need to drill long holes for grease supply.

Inner ring contact surface of roll 1 and sealed bearing 3 (section A in Figure 1)
Due to the bearing structure, it is not possible to lubricate the inner ring of conventional sealed double-row tapered bearings from the bearing side. However, the greasing hole machining time was a large proportion of the machining of the entire roll, and the length of the greasing hole was long.

In the present invention, a greasing hole is provided facing the inside of the bearing box from the side surface B of the bearing box 2, and a greasing hole is also provided in the pressed plate 5Vc. The lubricating oil supplied from the side surface B of the bearing box 2 through this greasing hole advances in the direction of the arrow and advances to between the roll 1 and the inner ring of the sealed bearing 3. With this method, there is no need to supply lubricating oil from the roll 1, no machining is required from the axial end of the roll 10, and the machining time for the entire roll can be significantly reduced. FIG. 2 is a detailed view of the greasing hole.

The lubricating oil supplied from the side surface B of the bearing box 2 advances in the direction of the arrow, passes through the greasing hole provided in the pressing plate 5, and further advances in the direction of the arrow. An oil seal 7 is fixed to the pressed plate 5 by a port 8rc. The oil seal 7 performs sealing between the pressed rings 9 so that the grease supplied from B is guided between the bearing inner ring and the roll neck AjC. Therefore, the lubricating oil that has passed between the oil seals 7 and 10 passes through the groove C provided in the inner ring of the sealed bearing 3 and flows into the circumferential surface of the roll 1.

A rubber string 11 is provided between the roll 1 and the stamping board 9. Rubber string 11VC and Jigrease roll 1
It does not flow to the outside through the gap between and the pressed plate 9. The rubber string 11 also serves to prevent water, scale, etc. from entering from the outside.

Therefore, the lubricating oil that has passed through the groove C is guided to the contact surface A between the roll 1 and the inner ring of the sealed bearing 3. There is a slight gap in the contact surface A, and the rotational circumferential speed of the roll 1 at the time of rotation start and rolling is slightly different from the rotational circumferential speed of the inner ring of the bearing 3, so the lubricating oil is gradually guided in the circumferential direction. . Further, an oil groove is provided in the inner ring of the sealed bearing 3 so that lubricating oil can easily flow in the longitudinal direction of the roll shaft.

This bearing box 2 and the press plate 5Vc greasing hole are provided, and further,
The greasing method, in which an oil seal 7 is installed and an oil groove C is formed on the inner ring of the sealed bearing 3, allows easy machining of the bearing box 2 and stamping plate 5, so it is suitable for low/I/1 shafts. There is no need to drill greasing holes from the end, leading to a significant reduction in the machining time for the entire roll 1.

〔Effect of the invention〕

According to the present invention, it is possible to reliably supply grease to the roll neck surface and the bearing annular surface from outside the bearing box, which is effective in preventing creep between the roll and the bearing inner ring.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a roll bearing of a rolling mill according to an embodiment of the present invention, and FIG. 2 is a detailed view of roll bearing greasing.

Claims (1)

[Claims] 1. In a rolling mill incorporating a sealed bearing including a bearing supporting the rolls and a bearing box housing the bearing, a greasing hole is provided in the bearing box and the outer ring of the bearing, A rolling mill characterized in that a groove is provided at an end of the bearing inner ring and lubricating oil is supplied between the roll and the bearing inner ring to enable lubrication between the roll and the bearing inner ring. roll bearing.