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US 6,547,443 B2Granted
Tapered roller bearing
AssigneeNtn Corporation
InventorsKimihiro Hanai, Takashi Tsujimoto, Tsukasa Yamakawa, Yasuhiro Shimizu, Shiro Ishikawa
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AssigneeNtn Corporation
InventorsKimihiro Hanai, Takashi Tsujimoto, Tsukasa Yamakawa, Yasuhiro Shimizu, Shiro Ishikawa
Estimating the term…
A tapered roller bearing comprises inner and outer and outer rings having raceways, a large flange surface and a small flange surface, tapered rollers between the raceways and each having large and small end faces at the ends, and a retainer for the tapered rollers. The average roughness of the large end faces and the large flange surface is 0.14 μm Ra or less. The radius of curvature of the large end faces is 75 to 85% of the roller reference radius, and the central angle of the contact positions between the tapered rollers and the large flange surface is {fraction (1/15)} to {fraction (1/10)} of the roller angle. The center of the contact surface between the tapered rollers and the raceways is offset toward the large end faces from the center of the rolling surfaces of the tapered rollers by 10% or less of the effective length of the tapered rollers.
A tapered roller bearing comprising an inner ring having a raceway on its outer peripheral surface, an outer ring having a raceway on its inner peripheral surface, a large flange surface and a small flange surface, tapered rollers rollably mounted between the raceway of said inner ring and the raceway of said outer ring and having a large end face at one end thereof and a small end face at the other end thereof, and a retainer for retaining said tapered rollers at regular spacings, wherein the average roughness R[=(Rr2+Rb2)½] of the roughness Rr of the large end faces of said tapered rollers and the roughness Rb of the large flange surface of said inner ring is 0.14 μm Ra or less, wherein the radius of curvature R of the large end faces of said tapered rollers is 75 to 85% of the roller reference radius, and the central angle of the contact positions between said tapered rollers and the large flange surface of said inner ring is set at {fraction (1/15)} to {fraction (1/10)} of the roller angle, wherein the center of the contact surface between said tapered rollers and said raceways is offset toward the large end faces of said tapered rollers from the center of the rolling surfaces of said tapered rollers by an amount which is 10% or less of the effective length of said tapered rollers.
A tapered roller bearing comprising an outer ring having a conical raceway, an inner ring having a conical raceway and formed with a large flange surface on the large-diameter side of said conical raceway and a small flange surface on its small-diameter side, a plurality of tapered rollers rollably arranged between said conical raceway of said outer ring and said conical raceway of said inner ring and having a large end face and a small end face, and a retainer for retaining said tapered rollers at circumferential spacings, wherein during use of the bearing, the large end faces of said tapered rollers are guided in contact with the large flange surface of said inner ring, wherein a predetermined pre-load is imparted between said tapered rollers and said respective raceways of said outer ring and said inner ring, wherein the radius of curvature R of the large end faces of said tapered rollers is set at 75 to 85% of the reference distance Rb between the apex of cone angle of said tapered rollers and said large flange surface.
Dependencies are inferred from the claim text.