Cage and ball bearing
AssigneeNtn Corporation
InventorGoro Nakao
Life of this patent
Estimating the term…
Abstract
A cage is provided which is less likely to be deformed by a centrifugal force, and in which the strength of a weld is less likely to decrease. Each horn portion includes a base wall axially connected to a ring portion, and located between pockets, and a pair of claws separated from each other. The pair of claws each has a pocket inner surface facing the pocket, and an opposed surface on the side opposite from the pocket inner surface. The base wall includes a pair of connection portions axially connecting the respective claws to the ring portion, and an intermediate portion circumferentially connecting the connection portions to each other. A weld is disposed in a resin area consisting of one of the claws, one of the connection portions, and a circumferential section of the ring portion.
Claims11
A cage comprising:
- a ring portion extending in a circular annular shape;
- and
- a plurality of horn portions disposed at uniform intervals in a circumferential direction, and protruding from the ring portion toward one axial side, the ring portion and the plurality of horn portions being integrally formed by injection molding of a synthetic resin,
- wherein rolling elements are received, respectively, in pockets of the cage that are each surrounded from three sides by the ring portion and a corresponding circumferentially adjacent pair of the horn portions,
- wherein the ring portion has pocket bottoms defining deepest portions of the respective pockets on the other axial side,
- wherein each of the horn portions comprises:
- a base wall axially connected to the ring portion, and located between, and circumferentially connected to, a corresponding circumferentially adjacent pair of the pockets;
- and
- a pair of claws circumferentially separated from each other, and protruding from the base wall toward the one axial side,
- wherein each claw of the pair of claws has:
- a pocket inner surface facing a corresponding one of the pockets;
- and
- an opposed surface located on a side circumferentially opposite from the pocket inner surface,
- wherein the base wall comprises:
- a pair of connection portions axially connecting the respective claws to the ring portion;
- and
- an intermediate portion circumferentially connecting the connection portions to each other, and
- wherein a weld formed during the injection molding is disposed in a resin area consisting of one of the claws, one of the connection portions axially connected to the one of the claws, and a circumferential section of the ring portion axially connected to the one of the connection portions, and
- wherein, on an outer periphery of the resin area having the weld, a second imaginary plane includes a center axis of the ring portion, and a positional relationship between the weld and the pocket inner surface based on the second imaginary plane is such that the weld is disposed so as not to protrude toward the pocket inner surface beyond the second imaginary plane, wherein the second imaginary plane includes, of the pocket inner surface, a boundary point between the base wall and the pocket inner surface.
Dependencies are inferred from the claim text.