TAPERED ROLLER BEARING

• US 20170204909A1
• Filed: 12/28/2016
• Published: 07/20/2017
• Est. Priority Date: 01/14/2016
• Status: Active Grant

• Current Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Original Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Inventors: MURATA, Junji, KAMAMOTO, Shigeo, SHISHIHARA, Yuki
• Granted Patent: US 9,964,151 B2
• Time in Patent Office: Days
• CPC Class Codes: F16C 19/364 with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
• CPC Class Codes: F16C 2361/61 Toothed gear systems, e.g. support of pinion shafts in general F16H57/02
• CPC Class Codes: F16C 33/4605 Details of interaction of cage and race, e.g. retention or centring
• CPC Class Codes: F16C 33/4635 made from plastic, e.g. injection moulded window cages
• CPC Class Codes: F16C 33/585 of raceways, e.g. ribs to guide the rollers
• CPC Class Codes: F16C 33/6681 Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements

Abstract

A tapered roller bearing includes an inner ring having an inner-ring raceway surface, an outer ring arranged radially outward of the inner ring so as to be concentric with the inner ring having an outer-ring raceway surface that faces the inner-ring raceway surface, a plurality of tapered rollers interposed between the inner-ring raceway surface and the outer-ring raceway surface; and a cage that holds the tapered rollers at predetermined intervals along a circumferential direction. A diameter of an inner peripheral surface of a small-diameter-side end of the cage is substantially the same as a diameter of a small-diameter-side pitch circle of the tapered rollers.

Claims

1. A tapered roller bearing comprising:

an inner ring having an inner-ring raceway surface;

an outer ring arranged radially outward of the inner ring so as to be concentric with the inner ring and having an outer-ring raceway surface that faces the inner-ring raceway surface;

a plurality of tapered rollers interposed between the inner-ring raceway surface and the outer-ring raceway surface; and

a cage that holds the tapered rollers at predetermined intervals along a circumferential direction, wherein

a diameter of an inner peripheral surface of a small-diameter-side end of the cage is substantially the same as a diameter of a small-diameter-side pitch circle of the tapered rollers.

2. The tapered roller bearing according to claim 1, wherein the cage has a small-diameter circular ring portion and a large-diameter circular ring portion arranged away from each other in an axial direction, and a plurality of cage bars coupling the small-diameter circular ring portion and the large-diameter circular ring portion, and pockets housing the tapered rollers are each formed as a space between the cage bars adjacent to each other in the circumferential direction, and

the inner peripheral surface of the small-diameter circular ring portion is connected to an inner peripheral surface of each of the cage bars so as to form no step.

3. The tapered roller bearing according to claim 2, wherein a groove portion through which a lubricant is guided is formed in the inner peripheral surface of each of the cage bars so as to extend in the axial direction, and axially one end of the groove portion. extends to the inner peripheral surface of the small-diameter circular ring portion.