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US 11,143,235 B2Granted
Tapered roller bearing
AssigneeNtn Corporation
InventorsTakashi Kawai, Tomoki Matsushita
Life of this patent
Estimating the term…
Abstract
Two projecting portions (45a and 45b) configured to guide a tapered roller (3) on distal end surfaces thereof are formed on a side surface (43a) of a pillar portion (43) of a retainer (4) so as to be separated apart from each other in a roller axis direction. The projecting portions (45a and 45b) are separated apart from each other in the roller axis direction with respect to both a small-diameter-side annular portion (41) and a large-diameter-side annular portion (42). The projecting portions (45a and 45b) each have a force-fit margin (F).
Claims18
A tapered roller bearing, comprising:
- an inner ring having an inner raceway surface formed on an outer peripheral surface thereof;
- an outer ring having an outer raceway surface formed on an inner peripheral surface thereof;
- a plurality of tapered rollers arranged between the inner raceway surface of the inner ring and the outer raceway surface of the outer ring;
- and
- a retainer configured to retain the tapered rollers at a plurality of positions in a circumferential direction,
- wherein the retainer comprises:
- a small-diameter-side annular portion;
- a large-diameter-side annular portion;
- and
- a plurality of pillar portions connecting the small-diameter-side annular portion and the large-diameter-side annular portion to each other,
- wherein the small-diameter-side annular portion, the large-diameter-side annular portion, and the plurality of pillar portions define a plurality of pockets in which the tapered rollers are received, each of the pockets being located between an adjacent pair of the plurality of pillar portions,
- wherein each of the plurality of pillar portions has a side surface with a plurality of projecting portions formed thereon that are separated apart from each other and both of the small-diameter-side annular portion and the large-diameter-side annular portion in a roller axis direction and are configured to guide one of the tapered rollers on distal end surfaces thereof,
- wherein the projecting portions each have a force-fit margin F,
- wherein side surfaces of the adjacent pairs of the plurality of pillar portions that face each other in a circumferential direction include non-contact portions, the non-contact portions being free from contact with a tapered outer peripheral surface of one of the tapered rollers located therebetween,
- wherein, for each of the adjacent pairs of the plurality of pillar portions, in cross-section in a direction perpendicular to the roller axis direction, the non-contact portions facing each other in the circumferential direction are separated by a distance that is larger than a diameter of the one of the tapered rollers located therebetween along an entire width of the non-contact portions, and
- wherein a distance between centers of guide surfaces of the projection portions adjacent to each other on the side surface of one of the plurality of pillar portions as a width C and an entire width B of one of the pockets are set so as to satisfy a relationship of C/B=0.45 to 0.55.
13 more elements
A tapered roller bearing, comprising:
- an inner ring having an inner raceway surface formed on an outer peripheral surface thereof;
- an outer ring having an outer raceway surface formed on an inner peripheral surface thereof;
- a plurality of tapered rollers arranged between the inner raceway surface of the inner ring and the outer raceway surface of the outer ring;
- and
- a retainer configured to retain the tapered rollers at a plurality of positions in a circumferential direction,
- wherein the retainer comprises:
- a small-diameter-side annular portion;
- a large-diameter-side annular portion;
- and
- a plurality of pillar portions connecting the small-diameter-side annular portion and the large-diameter-side annular portion to each other,
- wherein the small-diameter-side annular portion, the large-diameter-side annular portion, and the plurality of pillar portions define a plurality of pockets in which the tapered rollers are received, each of the pockets being located between an adjacent pair of the plurality of pillar portions,
- wherein each of the plurality of pillar portions has a side surface with a plurality of projecting portions formed thereon that are separated apart from each other and both of the small-diameter-side annular portion and the large-diameter-side annular portion in a roller axis direction and are configured to guide one of the tapered rollers on distal end surfaces thereof,
- wherein the projecting portions each have a force-fit margin F,
- wherein side surfaces of the adjacent pairs of the plurality of pillar portions that face each other in a circumferential direction include non-contact portions, the non-contact portions being free from contact with a tapered outer peripheral surface of one of the tapered rollers located therebetween,
- wherein, for each of the adjacent pairs of the plurality of pillar portions, in cross-section in a direction perpendicular to the roller axis direction, the non-contact portions facing each other in the circumferential direction are separated by a distance that is larger than a diameter of the one of the tapered rollers located therebetween along an entire width of the non-contact portions, and
- wherein a guide portion formed of a fracture surface is formed on a radially outer side of each of the distal end surfaces of the projecting portions, the fracture surfaces each having a roughness surface on which crystal grains appear.
13 more elements
A tapered roller bearing, comprising:
- an inner ring having an inner raceway surface formed on an outer peripheral surface thereof;
- an outer ring having an outer raceway surface formed on an inner peripheral surface thereof;
- a plurality of tapered rollers arranged between the inner raceway surface of the inner ring and the outer raceway surface of the outer ring;
- and
- a retainer configured to retain the tapered rollers at a plurality of positions in a circumferential direction,
- wherein the retainer comprises:
- a small-diameter-side annular portion;
- a large-diameter-side annular portion;
- and
- a plurality of pillar portions connecting the small-diameter-side annular portion and the large-diameter-side annular portion to each other,
- wherein the small-diameter-side annular portion, the large-diameter-side annular portion, and the plurality of pillar portions define a plurality of pockets in which the tapered rollers are received, each of the pockets being located between an adjacent pair of the plurality of pillar portions,
- wherein each of the plurality of pillar portions has a side surface with a plurality of projecting portions formed thereon that are separated apart from each other and both of the small-diameter-side annular portion and the large-diameter-side annular portion in a roller axis direction and are configured to guide one of the tapered rollers on distal end surfaces thereof,
- wherein the projecting portions each have a force-fit margin F,
- wherein side surfaces of the adjacent pairs of the plurality of pillar portions that face each other in a circumferential direction include non-contact portions, the non-contact portions being free from contact with a tapered outer peripheral surface of one of the tapered rollers located therebetween,
- wherein, for each of the adjacent pairs of the plurality of pillar portions, in cross-section in a direction perpendicular to the roller axis direction, the non-contact portions facing each other in the circumferential direction are separated by a distance that is larger than a diameter of the one of the tapered rollers located therebetween along an entire width of the non-contact portions,
- wherein the retainer is made of resin, and
- wherein a cross-section height “t” and a pillar width H of the pillar portions satisfy a relationship of H/t<1.5.
14 more elements
Dependencies are inferred from the claim text.