Needle roller bearing with double row of retainers

Patent metadata

Field	Value
Publication number	US-2016273580-A1
Application number	US-201415034620-A
Country	US
Kind code	A1
Filing date	Nov 14, 2014
Priority date	Nov 21, 2013
Publication date	Sep 22, 2016
Grant date	—

Abstract

A retainer-equipped double-row needle-roller bearing includes a pair of annular end flange portions; a center annular center flange portion; and two rows of pillars connecting the portions to each other to provide pockets between mutually adjacent pairs of pillars in a circumferential direction for holding rollers in two rows. The center flange portion has an outer diameter (φD 2 ), and the end flange portions have an outer diameter (φD 1 ), in a relationship expressed as φD 2< φD 1. When the retainer moves radially by an amount of gap associated with the rollers, the retainer is guided on the outer diameter surfaces of the end flange portions at two ends of the retainer, by the inner diameter surface of a housing. This stabilizes behavior of the retainer during rotation, reducing premature wear and abnormal noise.

First claim

1 . A double-row needle-roller bearing with a retainer comprising a pair of annular end flange portions; a center annular center flange portion; and two rows of pillars connecting said portions to each other to provide pockets between mutually adjacent pairs of pillars in a circumferential direction for holding rollers in two rows, wherein the center flange portion which has an outer diameter (φD 2 ) and the end flange portions which have an outer diameter (φD 1 ) are controlled to have a relationship expressed as φD 2 <φD 1 .

2 . The double-row needle-roller bearing with a retainer according to claim 1 , wherein the center flange portion is made to have a smaller thickness T 2 than a thickness T 1 of the end flange portions at two ends, to give the relationship of φD 2 <φD 1 .

3 . The double-row needle-roller bearing with a retainer according to claim 2 , wherein the thickness T 2 of the center flange portion and the thickness T 1 of the end flange portions at the two ends have a relationship expressed as T 2 ≧0.80×T 1 .

4 . The double-row needle-roller bearing with a retainer according to claim 1 , wherein the retainer is guided on its outer diameter or outer and inner diameters.

5 . The double-row needle-roller bearing with a retainer according to claim 1 , wherein the retainer is heat treated.

6 . The double-row needle-roller bearing with a retainer according to claim 1 , wherein the retainer is made by rolling and welding a steel plate.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• KAJIKAWA Syuichi

Classifications

• F16C2240/70

  Diameters; Radii · CPC title

• F16C2226/36

  by welding · CPC title

• F16C33/581

  integral with other parts, e.g. with housings or machine elements such as shafts or gear wheels · CPC title

• F16C33/545

  rolled from a band · CPC title

• F16C33/54

  made from wire, strips, or sheet metal (F16C33/48, F16C33/49 take precedence) · CPC title