Worm wheel and method of manufacturing the same
AssigneeNsk Ltd.
InventorsTakeshi Yamamoto, Toshiyuki Iwano
Life of this patent
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Abstract
In a worm wheel (41) and a method of manufacturing the same, the worm wheel has a metal worm wheel element (51) in which an axial bore (55) is formed at a rotational center and a synthetic resin gear ring (53) attached on the outer circumference of the worm wheel element, and a centering guide portion (77) that is coaxial with the axial bore (55) is formed on one surface of the metal worm wheel element (51).
Claims6
A worm wheel comprising:
- a metal worm wheel element in which an axial bore is formed at a rotation center;
- and
- a synthetic resin gear ring attached on the outer circumference of said worm wheel element,
- wherein a centering guide portion that is coaxial with said axial bore is formed on one surface of said metal worm wheel element.
A method of manufacturing a worm wheel in which a metal worm wheel element is set on a mold and synthetic resin is injection molded in the mold to form a synthetic resin gear ring integrally on the outer circumference of the metal worm wheel element, comprising the steps of:
- opposing a centering guide portion formed on said metal worm wheel element to a centering guide portion formed on said mold;
- and
- pressing the centering guide portion of said metal worm wheel element against the centering guide portion of said mold by injection pressure of the synthetic resin.
Dependencies are inferred from the claim text.