Jtekt Corporation

Hiroyuki Ohshima

Kazutoshi Toda

Hiroki Matsuyama

Kouji Kawaguchi

Naoki Masuda

Akiyuki Suzuki

Youzou Taniguchi

Daisuke Okamoto

Atsushi Nagai

A tapered roller bearing includes an inner ring including, on its outer circumferential surface, an inner raceway surface and including, on an end portion on a second axial side, a cone back face rib portion protruding radially outward, an outer ring including, on its inner circumferential surface, an outer raceway surface, a plurality of tapered rollers disposed between the inner ring and the outer ring, and an annular cage that retains the plurality of tapered rollers spaced from each other in a circumferential direction. The cage includes a small-diameter annular portion, a large-diameter annular portion located on the second axial side relative to the tapered rollers and the outer ring, and a plurality of cage bar portions. The large-diameter annular portion has an oil pocket having a first aperture that is open radially inward and a second aperture that is open toward the outer raceway surface.

Tapered roller bearing

A ball bearing includes an outer ring; an inner ring; a plurality of balls; and a cage that has an annular shape. Oil flows into an area between the outer ring and the inner ring from one side in an axial direction and flows out from the other side in the axial direction. The cage includes an annular portion provided on an oil inflow side, and bar portions extending from the annular portion toward an oil outflow side. An outer peripheral end portion of the annular portion is constituted by a corner portion at which an axial outer end face intersects with an outer peripheral surface. An axial position of a tip end of the corner portion is substantially same as an axial position of a side surface of the outer ring.

Ball bearing

A tapered roller bearing includes an outer ring, an inner ring, a plurality of tapered rollers interposed between the outer ring and the inner ring, and a cage for the tapered rollers. Ra is smaller than Rb where Ra represents a radius of curvature of a large end face of the tapered roller and Rb represents a radius of curvature of an end face of a large rib portion of the inner ring.

Tapered roller bearing, tapered roller bearing apparatus, and automotive pinion shaft supporting apparatus utilizing same tapered roller bearing apparatus

In a tapered roller bearing, LWR/DW is in the range of 1.1 to 1.7 where LWR represents a roller effective length of tapered rollers and DW represents a roller mean diameter of tapered rollers. RCO/LRO is 30 to 150, and RCI/LRI is 50 to 260 where RCO represents a crowning radius of an outer ring, LRO represents a raceway length of the outer ring, RCI represents a crowning radius of an inner ring and LRI represents a raceway length of the inner ring. The following expressions are satisfied: 20&#xb0;&#x2266;&#x3b1;&#x2266;30&#xb0;, and &#x3b1;&#x2212;0.87&#x3b3;&#x2212;0.334&#x2266;BK&#x2266;&#x3b1;&#x2212;0.87&#x3b3;&#x2212;0.167, where &#x3b1; represents a raceway angle of the outer ring, &#x3b3; represents a roller angle of the tapered rollers, and BK represents a rib angle of a large rib portion of the inner ring.

A tapered roller bearing according to the invention is such that the surface hardnesses of a raceway surface of an inner ring and rolling contact surfaces of tapered rollers are set to 63 to 69HRC. In addition, respective raceway surfaces of an outer ring and the inner ring and the rolling contact surfaces of the tapered rollers are crowned and are set such that a total crowning amount is 50 &#x3bc;m or larger, an outer crowning rate is 40% or larger and a roller crowning rate is 20% or smalled.

Tapered roller bearing an automotive pinion shaft supporting apparatus utilizing same tapered roller bearing

According to the invention, there is provided a tapered roller bearing in which, where D represents a larger end diameter of the tapered roller and L represents a roller length thereof, the roller length L is 18 mm or smaller, and a ratio of the large end diameter and the roller length of the tapered roller which is expressed by D/L is in the range of 0.55 to 0.9. In addition, respective raceway surfaces of the outer ring and the inner ring and rolling contact surfaces of the tapered rollers are crowned, and a total crowning amount is set to be 50 &#x3bc;m or larger, an outer ring crowning rate is set to be 40% or larger, and a roller crowning rate is set to be 20% or smaller.

Growing community of inventors

Kashihara, Japan

Hiroyuki Ohshima