Driving wheel bearing unit
AssigneeNtn Corporation
InventorsKoji Sahashi, Kazuhiko Hozumi, Keisuke Sone, Hisashi Ohtsuki, Ikuya Tateoka, Masahiro Ozawa
Life of this patent
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Abstract
A driving wheel bearing unit is disclosed which facilitates works including mounting and dismounting to/from a car body. The driving wheel bearing unit is set to satisfy Da≧Db, where Da is the diameter of its external member across a fitting surface thereof to be fitted to a mating member such as a knuckle, and Db is the maximum diameter of its constant velocity joint, so that a mounting bolt fixing the external member can be released to allow unitary extraction of the entire wheel bearing unit and the external member.
Claims12
A driving wheel bearing unit comprising:
- a wheel bearing including
- an external member having an outer periphery provided with a mounting flange for car-body mounting and a fitting surface, and an inner periphery provided with two outer races, and
- an internal member rotatably arranged inside said external member via a rolling element, said internal member having an outer periphery provided with a race and a wheel mounting flange for mounting a wheel;
- and
- a constant velocity joint to be arranged on one end of a driving shaft, said constant velocity joint including
- an outside joint member having an inner periphery provided with eight guide grooves,
- an inside joint member having an outer periphery provided with eight guide grooves,
- eight torque transmission balls individually arranged in eight ball tracks formed by pairs of said guide grooves in said outside joint member and said guide grooves in said inside joint member,
- a cage for retaining said torque transmission balls, and
- a boot to be attached to said outside joint member;
- said wheel bearing and said outside joint member of said constant velocity joint being integrated with each other, wherein
- the diameter of said boot across its maximum diameter portion is equal to or smaller than the diameter of said external member across said fitting surface.
A driving wheel bearing unit comprising:
- a wheel bearing including
- an external member having an outer periphery provided with a mounting flange for car-body mounting and a fitting surface, and an inner periphery provided with two outer races, and
- an internal member rotatably arranged inside said external member via a rolling element, said internal member having an outer periphery provided with a race and a wheel mounting flange for mounting a wheel;
- and
- a constant velocity joint to be arranged on one end of a driving shaft, said constant velocity joint including
- an outside joint member having an inner periphery provided with eight guide grooves,
- an inside joint member having an outer periphery provided with eight guide grooves,
- eight torque transmission balls individually arranged in eight ball tracks formed by pairs of said guide grooves in said outside joint member and said guide grooves in said inside joint member,
- a cage for retaining said torque transmission balls, and
- a boot to be attached to said outside joint member;
- said wheel bearing and said outside joint member of said constant velocity joint being integrated with each other, wherein
- the diameter of said outside joint member across its maximum diameter portion is equal to or smaller than the diameter of said external member across said fitting surface.
Dependencies are inferred from the claim text.