Back to results
US 8,783,965 B2Granted
Tapered roller bearing
AssigneeNtn Corporation
InventorTakashi Tsujimoto
Life of this patent
Estimating the term…
Abstract
A tapered roller bearing is used in transmissions or differentials for automobiles. The tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers rollably disposed between the inner and outer rings, and a cage for holding the tapered rollers at circumferential predetermined intervals. The roller coefficient γ exceeds 0.94, where γ is (the number of rollers×mean roller diameter)/(π×PCD).
Claims7
A tapered roller bearing comprising:
- an inner ring;
- an outer ring;
- a plurality of tapered rollers rollably disposed radially between said inner and outer rings;
- and
- a cage having a small diameter side, a large diameter side and a plurality of pockets for holding said tapered rollers at circumferential predetermined intervals, wherein
- each of said pockets has a small diameter side end wall located at said small diameter side of said cage and a large diameter side end wall located at said large diameter side of said cage,
- each of said tapered rollers has a small diameter end facing said small diameter side end wall of a respective one of said pockets and a large diameter end facing said large diameter side end wall of said respective one of said pockets,
- a distance between said large and small diameter side end walls of said pockets is greater than a distance between said large and small diameter ends of said tapered rollers to form a clearance therebetween,
- when said cage is positioned such that a portion of the clearance exists between said large diameter side end walls of said pockets and said large diameter ends of said tapered rollers and another portion of the clearance exists between said small diameter side end walls of said pockets and said small diameter ends of said tapered rollers, said cage is movable radially from a central axis of said outer ring without contacting said outer ring,
- when said cage is positioned such that all of the clearance exists between said small diameter side end walls of said pockets and said small diameter ends of said tapered rollers and none of the clearance exists between said large diameter side end walls of said pockets and said large diameter ends of said tapered rollers, said cage is movable radially from the central axis of said outer ring to come into contact with said outer ring,
- the tapered roller bearing has a roller coefficient that exceeds 0.94, and
- the roller coefficient=(Z·DA)/(π·PCD), where
- Z is a number of said tapered rollers,
- DA is a mean diameter of said tapered rollers, and
- PCD is a pitch circle diameter of said tapered rollers.
12 more elements
Dependencies are inferred from the claim text.