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US 9,192,986 B2Granted
Cage, rolling bearing, method for manufacturing cage, and injection mold
AssigneeNtn Corporation
InventorsEiichirou Shimazu, Yasutake Hayakawa
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Abstract
A cage (14) is made of a magnesium alloy and has a light weight and a high strength. The cage (14) is made of a magnesium alloy such as AZ91D, and is formed by means of injection molding. In this cage (14), a confluence region is brought away to outside the cage (14) during the injection molding. The confluence region is a region including voids formed by merging of flows of the magnesium alloy.
Claims8
A cage for holding a rolling element in a rolling bearing,
- the cage being made of a magnesium alloy,
- the cage being molded by injection molding, and
- wherein a confluence region is brought away to outside the cage during said injection molding, said confluence region being a region including a void formed by merging of flows of said magnesium alloy being in a complete molten state, such that no weld line exists at a weld portion of the cage.
A method for manufacturing a cage for holding a rolling element in a rolling bearing, comprising the steps of:
- causing a magnesium alloy to be in a complete molten state by heating said magnesium alloy;
- molding said magnesium alloy, into a shape of said cage by injecting said magnesium alloy into a mold including a cavity portion corresponding to the shape of said cage so as to fill said cavity portion with said magnesium alloy;
- and
- extracting, from said mold, said cage formed of said magnesium alloy thus molded into the shape of said cage,
- wherein in the step of molding said magnesium alloy into the shape of said cage, a confluence region is brought away to outside said cavity portion, said confluence region being a region including a void formed by merging of flows of said magnesium alloy, such that no weld line exists at a weld portion of said cage.
2 more elements
Dependencies are inferred from the claim text.