JP-2026076007-A - Rolling bearings

Abstract

[Problem] To provide a rolling bearing that can prevent lubricant from flowing out from the space between the opposing inner and outer ring raceway surfaces into other spaces adjacent in the axial direction, and that is easy to manufacture. [Solution] The inner ring member has a flange formed between two adjacent rows of inner ring raceway surfaces in the axial direction, and an annular projection that protrudes radially outward from the outer circumferential surface of the flange and is integrally formed with the inner ring member. When the axial width of the radially inner end of the projection connected to the outer circumferential surface of the flange is A, and the axial width of the radially outer end of the projection is B, then A < B. [Selection Diagram] Figure 2

Inventors

• 古川 翔

Assignees

• 日本精工株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (4)

1. An outer ring member having double rows of outer ring raceway surfaces on its inner circumferential surface, An inner ring member having double rows of inner ring raceway surfaces on its outer circumferential surface, A plurality of rolling elements are arranged between the outer ring raceway surface and the inner ring raceway surface, which are opposite to each other, A retainer that holds the plurality of rolling elements so that they can roll, A rolling bearing equipped with, The inner ring member is A flange formed between the two rows of inner ring raceway surfaces adjacent in the axial direction, An annular projection extends radially outward from the outer circumferential surface of the flange and is integrally formed with the inner ring member, It has, A rolling bearing characterized in that when A is the axial width of the radially inner end of the projection connected to the outer circumferential surface of the flange, and B is the axial width of the radially outer end of the projection, A < B.
2. The rolling bearing according to claim 1, characterized in that the axial width of the protrusion increases towards the radially outward direction.
3. The aforementioned protrusion is A base portion is formed to extend radially outward from the radially inner end, and has an axial width equal to that of the radially inner end, A widened portion is provided radially outward from the base, and has a larger axial width than the base, A rolling bearing according to claim 1, characterized by having the following:
4. The aforementioned rolling bearing is for a rolling mill in a steelmaking facility, A rolling bearing according to any one of claims 1 to 3, characterized in that the axis of rotation of the rolling bearing is arranged to face vertically.

Description

This invention relates to rolling bearings. Generally, a steel rolling mill comprises multiple rolling rolls for rolling the material in the thickness direction and multiple edger rolls for rolling the material in the width direction. Figure 5 is a schematic cross-sectional view of an edger roll for a steel rolling mill. As shown in Figure 5, the edger roll 250 consists of a pair of vertical rolls 200 installed with their rotation axes oriented vertically. The pair of vertical rolls 200 are arranged so that the outer circumferential surface of the roll portion 201 contacts the side surface extending in the thickness direction of the material being rolled 500. Furthermore, the shaft portion 202, which is axially connected to the roll portion 201, is supported so as to be able to roll by a chock 203 and a bearing 230. As shown in Figure 5, vertical multi-row rolling bearings used in the vertical rolls of steel rolling mills are installed with the rotation axis oriented vertically. In such cases, the lubricant (grease) that lubricates the upper row of rolling elements, which are arranged in two vertical rows, can flow down to the lower row of rolling elements due to its own weight when the bearing is stopped or rotating, potentially resulting in insufficient lubrication of the upper row. As a rolling bearing that solves such lubricant flow problems, for example, as described in Patent Document 1, there is a rolling bearing in which a flange portion is integrally formed on the outer diameter surface of the annular portion of the rolling element cage, and this flange portion partitions the lubricant holding space between the upper and lower rolling element rows. Furthermore, the rolling bearing described in Patent Document 2 employs a structure in which an annular flange member is engaged with the inner ring to partition the lubricant-holding spaces between the upper and lower rows of rolling elements. Japanese Patent Publication No. 2005-76724Japanese Patent Publication No. 2013-032837 Figure 1 is a cross-sectional view of a part of the vertical roll of the rolling mill according to this embodiment.Figure 2 shows a cross-section of the tapered roller bearing according to this embodiment, perpendicular to the circumferential direction.Figure 3 shows a cross-section perpendicular to the circumferential direction of a tapered roller bearing according to a modified example of this embodiment.Figure 4 shows a cross-sectional view perpendicular to the circumferential direction of a tapered roller bearing according to a comparative example of this embodiment.Figure 5 is a schematic cross-sectional view showing an edger roll for a steel rolling mill. Figure 1 is a cross-sectional view of a part of the vertical roll of the rolling mill according to this embodiment. As shown in Figure 1, the vertical roll 100 of this embodiment comprises a roll section 1, a shaft section 2 connected to the roll section 1, a chock 3 which is a housing, and a double-row tapered roller bearing 30 which is a rolling bearing disposed between the shaft section 2 and the chock 3. Here, the tapered roller bearing 30 according to this embodiment is for use in the vertical rolls of a rolling mill in a steelmaking facility. The vertical rolls 100 roll the plate-shaped steel member (not shown), which is the material to be rolled, along the side extending in the thickness direction, i.e., the vertically extending surface, to a predetermined width. Therefore, the rotation axes of the vertical rolls 100 and the rolling bearing 30 are arranged to face vertically. Hereinafter, with respect to the axial direction, the downward vertical side, i.e., the direction in which gravity acts (the downward side in Figure 1), will be referred to as the axial downward side. The side opposite the axial downward side (the upward side in Figure 1) will be referred to as the axial upward side. The tapered roller bearing 30 comprises an outer ring member 36 consisting of a pair of outer rings 31a, 31b and an outer ring spacer 35 that fit onto the inner circumferential surface of the chock 3; an inner ring member consisting of a single inner ring 32 that fits onto the outer circumferential surface of the shaft portion 2; tapered rollers 33, 33, which are rolling elements arranged in double rows between the inner circumferential surfaces of the pair of outer rings 31a, 31b and the outer circumferential surface of the single inner ring 32; and a pair of cages 34, 34 that hold the double rows of tapered rollers 33, 33 so that they can roll at equal intervals in the circumferential direction. The outer ring member 36 is composed of an outer ring 31a, an outer ring spacer 35, and an outer ring 31b, arranged coaxially from the axial upper side. The outer ring spacer 35 is sandwiched between the pair of outer rings 31a and 31b. Here, the pair of outer rings 31a and 31b each have outer ring raceway surfaces 41a and 41b on their inner circumferential surfaces, forming a double row