Tapered roller bearing

Abstract

This invention relates to an inner ring guided tapered roller bearing (1), wherein the small-diameter side annular portion (6) and / or the large-diameter side annular portion (7) of the retainer (5) have flange-like portions (6a, 7a) extending from the column portion (8) via arc-shaped curved portions (6b, 7b) towards the inner diameter side, and have slit-like oil passages (10, 11) at multiple locations on the inner periphery of the flange-like portions (6a, 7a); and the dimensionless number Z, determined by the following formula, is 1.55 or more and 2.66 or less, in which the projected area of ​​the oil passages (10, 11) in the bearing axial direction is represented by (A), the radius of curvature at the center of the width direction of the oil passages (10, 11) is represented by (r), and the inner diameter of the flange-like portions (6a, 7a) is represented by (D). I This indicates that the outer diameter of the curved portions (6b, 7b) is determined by (D). O This means: Z = AD I 2 / π(D O 2 -D I 2 )r 2 .

Claims

1. A tapered roller bearing, which is an inner ring guided type tapered roller bearing, the inner ring guided type tapered roller bearing comprising: An inner ring with two serrations; An outer component having an annular rolling surface opposite to the rolling surface of the inner ring; A plurality of tapered rollers disposed between the inner ring and the outer component; and A retainer that holds the aforementioned tapered rollers; The aforementioned retainer has a small-diameter side annular portion, a large-diameter side annular portion, and a column portion connecting multiple circumferential portions of the small-diameter side annular portion and the large-diameter side annular portion; At least one of the aforementioned small-diameter side annular portion and the aforementioned large-diameter side annular portion has a flange-shaped portion extending from the aforementioned column portion to the inner diameter side via an arc-shaped curved portion, and has slit-shaped oil passages at multiple locations on the inner periphery of the flange-shaped portion that allow lubricating oil to pass inward and outward relative to the bearing axial direction of the flange-shaped portion. The dimensionless number Z, determined by the following formula (1), is between 1.55 and 2.

66. In this formula (1), the projected area of ​​the oil passage along the bearing axis is represented by A, the radius of curvature at the center of the width direction of the oil passage is represented by r, and the inner diameter of the flange-like portion is represented by D. I This indicates that the outer diameter of the aforementioned curved portion is determined by D. O express: Z❝AD I 2 / π(D O 2 -D I 2 )r 2 ……(1)。 2. The tapered roller bearing according to claim 1, wherein, The cut shape of the above-mentioned oil passage is a circular arc or an elliptical arc.

3. The tapered roller bearing according to claim 1 or 2, wherein, The aforementioned large-diameter side annular portion has the aforementioned flange-shaped portion, and the bending angle of the flange-shaped portion relative to the aforementioned column portion is within the range of 90°±10°, based on the angle of inclination of the aforementioned column portion relative to the bearing axis, i.e., the retainer angle.

4. The tapered roller bearing according to claim 1 or 2, wherein, The aforementioned large-diameter side annular portion has the aforementioned flange-like portion, and the radius of curvature of the inner diameter side surface of the aforementioned curved portion connected by the flange-like portion is greater than 20% and less than 90% of the length of the aforementioned large-diameter side annular portion in the direction in which the aforementioned column extends.

5. The tapered roller bearing according to claim 1 or 2, wherein, The ratio of the area of ​​the longitudinal section of the large-diameter side annular portion that does not pass through the oil passage to the area of ​​the longitudinal section of the small-diameter side annular portion that does not pass through the oil passage is greater than 1.0 and less than 1.2.

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