Title:
BEARING WITH LOW WEAR AND LOW POWER LOSS CHARACTERISTICS
Document Type and Number:
WIPO Patent Application WO2002093029
Kind Code:
A9
Abstract:
A tapered roller bearing (26, 28) that is well-suited for supporting a pinion in an automotive differential (A) has a cone (44) and a cup (46) provided with opposed raceways (52, 64) that are crowned. The cone also has a thrust rib (54) provided with a rib face (58) at the large end of its raceway. In addition, the bearing has tapered rollers (48), each having a tapered side face (70) that is crowned and a large end (72) that is spherical. The rollers (48) contact the raceways (52, 64) along their crowned side faces and the rib face along their spherical end faces. The ratio of the roller length (C) to the large end diameter (D) is less than 1.5. The crowning on the raceway (52, 64), together with the crowning of the roller side face (70) provide total end relief ranging between 700 microin. and 1500 microin. per inch. The centers of contact between the side faces (70) and raceways (52, 64) are offset toward the rib face (58). The height of the rib face (58) amounts to 30% - 45% of the diameter of the large ends (72) of the rollers (48). The radius of the spherical large end face (52) for a roller exceeds 90% of the roller apex length. The runout in the large end faces is less than 50 microin. and the center of contact between the end face (72) of each roller (48) and the rib face (58) is between ranges between 0.02 and 0.04 in. All of this contributes to low torque demands by the bearing itself and wear.
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Inventors:
JOKI MARK A
Application Number:
PCT/US2002/014809
Publication Date:
March 27, 2003
Filing Date:
May 10, 2002
Export Citation:
Assignee:
TIMKEN CO (US)
International Classes:
F16C19/36; F16C33/30; F16C33/58; (IPC1-7): F16C19/36; F16H1/14
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