Tapered roller bearing
AssigneeNtn Corporation
InventorsShouta Toho, Naoki Nakatochi
Life of this patent
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Abstract
Provided is a tapered roller bearing (1) for which a dimensionless number X is defined by the following formula (1) based on a small-diameter-side gap S1 which is a gap between a small-diameter-side annular part (6) of a retainer (5) and a small collar part (2b) of an inner ring (2), a large-diameter-side gap S2 which is a gap between the large-diameter-side annular part (7) and a large collar part (2c) of the inner ring (2), an average roller diameter d, a roller length l, and an outer member angle α. The dimensionless number X falls within a range of 0.69<X<1.12.
Claims6
A tapered roller bearing of inner ring-guided type comprising:
- an inner ring including collars on opposite sides of the inner ring,
- an outer member including a rolling surface having an annular shape, the rolling surface facing a rolling surface of the inner ring,
- a plurality of tapered rollers interposed between the inner ring and the outer member, and
- a retainer configured to retain the plurality of tapered rollers, the retainer including:
- a small-diameter-side annular part, a large-diameter-side annular part, and pillar parts which are arranged at a plurality of positions in a circumferential direction and connect the small-diameter-side annular part and the large-diameter-side annular part, wherein a dimensionless number X falls within a range of 0.69<X<1.12, the dimensionless number X defined by the formula:
- X
- =
- 1
- tan
-
- α
-
- (
- 1
- -
- S
- 1
- S
- 2
-
- d
- l
- )
- wherein a small-diameter-side gap S1 which is a gap between the small-diameter-side annular part of the retainer and a small collar part of the inner ring, a large-diameter-side gap S2 which is a gap between the large-diameter-side annular part and a large collar part of the inner ring, an average roller diameter d, a roller length l, and an outer member angle α (where α is from 20° to) 40° which is a tapering angle at which the rolling surface of the outer member is inclined.
A tapered roller bearing of inner ring-guided type comprising:
- an inner ring including collars on opposite sides of the inner ring,
- an outer member including a rolling surface having an annular shape, the rolling surface facing a rolling surface of the inner ring,
- a plurality of tapered rollers interposed between the inner ring and the outer member, and
- a retainer configured to retain the plurality of tapered rollers, the retainer including:
- a small-diameter-side annular part, a large-diameter-side annular part, and pillar parts which are arranged at a plurality of positions in a circumferential direction and connect the small-diameter-side annular part and the large-diameter-side annular part, wherein a dimensionless number X falls within a range of 0.69<X<1.12, the dimensionless number X defined by the formula:
- X
- =
- 1
- tan
-
- α
-
- (
- 1
- -
- S
- 1
- S
- 2
-
- d
- l
- )
- wherein a small-diameter-side gap S1 which is a gap between the small-diameter-side annular part of the retainer and a small collar part of the inner ring, a large-diameter-side gap S2 which is a gap between the large-diameter-side annular part and a large collar part of the inner ring, an average roller diameter d, a roller length l, and an outer member angle α (where α is from 20° to) 40° which is a tapering angle at which the rolling surface of the outer member is inclined, and
- wherein the large-diameter-side annular part of the retainer includes a flanged part extending in a bending manner toward a radially inside with respect to the pillar parts via a bent part having an arc shape, and the bent part has a bent part R-dimension which is a radius of curvature on a radially inner surface of the bent part within a range of from 20% to 90% relative to an axial length which is a length of the large-diameter-side annular part in a direction in which the pillar parts extend.
Dependencies are inferred from the claim text.