Retainer for roller bearing
AssigneeNsk Ltd.
InventorsMasahito Matsui, Takashi Murai
Life of this patent
Estimating the term…
Abstract
A retainer for a roller bearing includes a pair of annular portions and a plurality of columns 23 provided between the annular portions. A plurality of pockets are defined by the annular portion and the column each for receiving a roller. An indented relief is provided on the corners of the plurality of pockets and the circumferential average width d (mm) of the column at the area where the indented relief is provided, the axial thickness t (mm) of the annular portion at the area where the indented relief is provided, the radius r (mm) of curvature of the indented relief, the average diameter Da (mm) of the roller and the pitch circle diameter dm (mm) of the bearing satisfy a relationship: 0.07×dm+20≦(2/d+4/t+1/r)×Da≦0.07×dm+50.
Claims10
A retainer for a roller bearing, comprising:
- a pair of annular portions;
- and
- a plurality of columns provided between said annular portions, said annular portions and said columns cooperatively defining a plurality of pockets each for receiving a roller,
- wherein an indented relief is formed on each of corners of the plurality of pockets, and
- wherein a circumferential average width d (mm) of said column at an area where said indented relief is formed, an axial thickness t (mm) of said annular portion at the area where said indented relief is formed, a radius r (mm) of curvature of said indented relief, an average diameter Da (mm) of the roller and a pitch circle diameter dm (mm) of the roller bearing satisfy the following relationship [1]:
- 0.07×dm+20≦(2/d+4/t+1/r)×Da≦0.07×dm+50 [1]
Dependencies are inferred from the claim text.