JP2008019892A - Self-aligning roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the posture of the barrel-shaped roller of a self-aligning roller bearing and to reduce the pressure of rolling contact between an inner race and the barrel-shaped roller. <P>SOLUTION: Each raceway surface 2 of the inner race 1 is formed of two conical surfaces 2a, 2b. The barrel-shaped roller 5 is brought into contact with the raceway surface 2 at two points P<SB>1</SB>, P<SB>2</SB>so as to prevent the roller-shaped barrel 5 from skewing or tilting and stabilize its posture, while also dispersing the pressure of rolling contact between the inner ring 1 and the barrel-shaped roller 5 to the two points of contact P<SB>1</SB>, P<SB>2</SB>to reduce the pressure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a self-aligning roller bearing.

  A plurality of barrel rollers are arranged in two rows between the two rows of raceway surfaces provided on the outer diameter surface of the inner ring and the raceway surfaces facing the two rows of raceway surfaces of the inner ring provided on the inner diameter surface of the outer ring. In the aligned spherical roller bearings, two rows of raceways of the inner ring are formed by a secondary curved surface having an arc-shaped cross section, and the raceway surface of the outer ring is formed by a common spherical surface (see, for example, Patent Document 1).

  In such a self-aligning roller bearing, the radius of curvature of the barrel-shaped cross section of the tapered roller is formed slightly smaller than the radius of curvature of the cross section of each raceway surface of the inner ring and the outer ring described above. The track surface is in contact with each other at one point.

JP 2001-140845 A

  In the conventional self-aligning roller bearing described above, the barrel roller contacts the raceway surfaces of the inner ring and the outer ring at one point each, so that the rolling barrel roller skews in the traveling direction or is orthogonal to the traveling direction. There is a problem that the posture becomes unstable by tilting in the cross section.

  Further, the raceway surface of the outer ring with which the barrel roller contacts at one point is formed as a spherical surface that is concave in both the axial direction and the circumferential direction, while the raceway surface of the inner ring is concave in the axial direction. Since it is formed with a convex secondary curved surface in the circumferential direction, the rolling contact pressure with the barrel roller becomes higher than that on the outer ring side, and there is also a problem that the rolling fatigue life of the inner ring and the barrel roller is shortened. .

  Accordingly, an object of the present invention is to stabilize the posture of the barrel roller of the self-aligning roller bearing and to reduce the rolling contact pressure between the inner ring and the barrel roller.

  In order to solve the above-described problems, the present invention provides two rows of raceway surfaces provided on the outer diameter surface of the inner ring and a raceway surface facing the two rows of raceway surfaces of the inner ring provided on the inner diameter surface of the outer ring. In a self-aligning roller bearing in which a plurality of tapered rollers are arranged in two rows, an inner ring in which the raceway surface of the inner ring is formed with a plurality of curved surfaces, and the barrel rollers are formed with the plurality of curved surfaces. The structure which makes contact with the raceway surface at multiple points was adopted.

  That is, the inner ring raceway surface is formed by a plurality of curved surfaces, and the barrel roller is brought into contact with the inner ring raceway surface formed by the plurality of curved surfaces at a plurality of points, thereby preventing the skew and tilt of the barrel roller. In addition to stabilizing the posture, the rolling contact pressure between the inner ring and the tapered roller can be reduced by dispersing it at a plurality of contact points.

  By making the plurality of curved surfaces forming the raceway surface of the inner ring conical, the raceway surface of the inner ring formed by the plurality of curved surfaces can be easily processed.

  In the self-aligning roller bearing of the present invention, the raceway surface of the inner ring is formed with a plurality of curved surfaces, and the barrel roller is brought into contact with the raceway surface of the inner ring formed with the plurality of curved surfaces at a plurality of points. The posture can be stabilized by preventing skew and tilt of the roller, and the rolling contact pressure between the inner ring and the barrel roller is reduced by dispersing it at multiple contact points, and the rolling fatigue life of the inner roller and the barrel roller is reduced. Can be extended.

  By making the plurality of curved surfaces forming the raceway surface of the inner ring conical, the raceway surface of the inner ring formed by the plurality of curved surfaces can be easily processed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment. This self-aligning roller bearing includes a plurality of barrel rollers 5 between two rows of raceway surfaces 2 provided on the outer diameter surface of the inner ring 1 and a raceway surface 4 provided on the inner diameter surface of the outer ring 3. are those which are arranged in two rows, each raceway surfaces 2 are two conical surfaces 2a of the inner ring 1 is formed by 2b, as roller barrel 5 are in contact with each orbit plane 2 at two points P _1, P ₂ It has become. The raceway surface 4 of the outer ring 3 is formed of a common spherical surface, and each of the tapered rollers 5 is in contact with the raceway surface 4 at one point Q.

FIG. 2 shows a second embodiment. The self-aligning roller bearing has the same basic configuration as that of the first embodiment, and each raceway surface 2 of the inner ring 1 is formed by three secondary curved surfaces 2c, 2d, and 2e. The point is different. Also in this embodiment, the round roller 5 contacts each raceway surface 2 of the inner ring 1 at two points P ₁ and P ₂ .

  In each of the above-described embodiments, the barrel roller is in contact with each raceway surface of the inner ring at two points. However, the barrel roller can be brought into contact at three or more points.

Longitudinal sectional view showing the self-aligning roller bearing of the first embodiment Longitudinal sectional view showing the self-aligning roller bearing of the second embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Raceway surface 2a, 2b Conical surface 2c, 2d, 2e Secondary curved surface 3 Outer ring 4 Raceway surface 5 Tapered roller

Claims (2)

  Two rows of barrel rollers are arranged between two rows of raceway surfaces provided on the outer diameter surface of the inner ring and a raceway surface facing the two rows of raceway surfaces of the inner ring provided on the inner diameter surface of the outer ring. In the self-aligning roller bearings arranged in the above, the raceway surface of the inner ring is formed by a plurality of curved surfaces, and the barrel roller is brought into contact with the raceway surface of the inner ring formed by the plurality of curved surfaces at a plurality of points. Self-aligning roller bearing characterized by   The self-aligning roller bearing according to claim 1, wherein a plurality of curved surfaces forming the raceway surface of the inner ring are conical surfaces.

Images