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US 2025/0146530 A1Published application
Ball bearing
AssigneeNtn Corporation
InventorsYasuhiro KANBORI, Yuta MOCHIZUKI, Yuuki HASHIZUME, Takufumi SATO
Life of this patent
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Abstract
Each second rivet hole has an inner periphery constituted by a cylindrical shear surface having a constant inner diameter that does not axially change; and a tapered fracture surface gradually radially expanding from the shear surface toward an abutment surface.
Claims10
A ball bearing comprising:
- an inner ring;
- an outer ring arranged radially outwardly of, and coaxially with, the inner ring;
- a plurality of balls disposed between the inner ring and the outer ring so as to be circumferentially spaced apart from each other;
- and
- an iron plate rivet crimping cage retaining the balls,
- wherein the iron plate rivet crimping cage includes:
- a first annular member formed of a steel plate;
- a second annular member formed of a steel plate, and axially opposed to the first annular member;
- and
- a plurality of rivets coupling the first annular member and the second annular member together,
- wherein the first annular member includes:
- arc-shaped first pocket wall portions receiving the respective balls;
- and
- first flat plate portions disposed to circumferentially alternate with the first pocket wall portions, and each having a first rivet hole axially extending through the first annular member, and,
- wherein the second annular member includes:
- arc-shaped second pocket wall portions receiving the respective balls;
- and
- second flat plate portions disposed to alternate with the second pocket wall portions, and each having:
- a second rivet hole axially extending through the second annular member;
- and,
- an abutment surface against a corresponding one of the first flat plate portions, and
- wherein each of the rivet includes:
- a rivet shaft inserted through a corresponding one of the first rivet holes of the first flat plate portions and a corresponding one of the second rivet holes of the second flat plate portions;
- a pre-formed head formed at one end of the rivet shaft, and axially engaged with the corresponding one of the first flat plate portions;
- and
- a crimped head formed at the other end of the rivet shaft, and axially engaged with a corresponding one of the second flat plate portions, and
- wherein each of the second rivet holes has an inner periphery constituted by:
- a cylindrical shear surface having a constant inner diameter that does not axially change;
- and
- a tapered fracture surface gradually radially expanding from the shear surface toward a corresponding one of the abutment surfaces of the second flat plate portions.
27 more elements
Dependencies are inferred from the claim text.