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US 2015/0354688 A1Published application
Worm wheel and electric power steering apparatus
AssigneeNsk Ltd.
InventorsHaruhiko KIYOTA, Takeshi YAMAMOTO, Fumiaki MITSUHASHI
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Abstract
A core of a worm wheel has an axial end surface formed with a first annular recess, another axial end surface formed with a second annular recess, and a third annular recess formed in a radially outer region of the first annular recess. A rim portion has a first inner circumferential portion fixed to the first annular recess, a second inner circumferential portion fixed to the second annular recess, and a protrusion engaged with the third annular recess.
Claims8
A worm wheel comprising:
- a disk-shaped core made of metal;
- and
- a substantially annular rim portion made of synthetic resin and covering an outer circumferential portion of the core;
- wherein a gear is formed on an outer circumferential portion of the rim portion,
- wherein the rim portion is integrally formed with the core by synthetic resin injection molding,
- wherein the core comprises a center hole into which a shaft is fitted, an axial end surface formed with a first annular recess, another axial end surface formed with a second annular recess, and a third annular recess formed on a surface in a radially outer region of the first annular recess, and
- wherein the rim portion comprises a first inner circumferential portion extending from an axial end surface of the rim portion to the radially outer region of the first annular recess and fixed to the radially outer region of the first annular recess, a second inner circumferential portion extending from another axial end surface of the rim portion to a radially outer region of the second annular recess and fixed to the radially outer region of the second annular recess, and a protrusion engaged with the third annular recess.
4 more elements
Dependencies are inferred from the claim text.