US 2013/0220073 A1 · MOTOR APPARATUS AND MANUFACTURING METHOD THEREOF

Abstract

A seal member is attached to a cover which occludes a gear case as a housing unit. The seal member is formed of elastomer and integrally formed with: a plate-shaped portion formed into a disc shape which covers the inner surface of the cover; an inner seal portion which is positioned on the inner peripheral edge of a through-hole, and comes into sliding contact with the outer peripheral surface of an output member; an outer seal portion which is positioned on the periphery of the cover, and comes into contact with the opening end of the housing unit; and anchor portions which latch onto the front surface of the cover via mounting holes provided to the cover. The boundary between the seal member and the cover extends only to the outside of the gear case, and does not extend to the inside of the gear case.

Claims17

Dependent claims

A motor apparatus which is formed by coupling a motor case having a rotational shaft housed therein and a gear case having a gear mechanism housed therein with each other, the motor apparatus comprising:

a gear cover which occludes an opening of the gear case, the gear cover having a center portion formed with a through hole, an output shaft being introduced through the through hole;
and
a seal member which is provided on one side surface of the gear cover,
wherein the seal member has:
a flat-plate main body which covers one side surface of the gear cover,
a first lip portion which is provided to an inner peripheral edge of the flat-plate main body so as to tightly seal a gap between the gear cover and the output shaft, and
a second lip portion which is provided to an outer peripheral edge of the flat-plate main body so as to tightly seal a gap between the gear cover and the gear case.

4 more elements

A method for manufacturing a motor apparatus which is formed by coupling a motor case having a rotational shaft housed therein and a gear case having a gear mechanism housed therein with each other, the method comprising:

a first step of allowing a first mold and a second mold to abut on each other, and supplying molten resin to a hollow portion formed between the first mold and the second mold, the first mold molding one side surface of a gear cover which occludes an opening of the gear case, the gear cover having a center portion formed with a through hole through which an output shaft is introduced, the second mold molding the other side surface of the gear cover;
a second step of separating only the first mold from the gear cover formed in the first step with the gear cover being attached to the second mold;
a third step of allowing a third mold for molding one side surface of a seal member to abut on the second mold with the gear cover being attached to the second mold, and supplying molten resin to a hollow portion formed between the second mold and the third mold, the seal member having a ring-shaped flat-plate main body provided to one side surface of the gear cover, a first lip portion provided to an inner peripheral edge of the flat-plate main body so as to tightly seal a gap between the gear cover and the output shaft, and a second lip portion provided to an outer peripheral edge of the flat-plate main body so as to tightly seal a gap between the gear cover and the gear case;
and
a fourth step of separating the second mold and the third mold from each other, and allowing the gear cover integrally formed with the seal member to be detached from the second mold and the third mold.

2 more elements

Dependencies are inferred from the claim text.

Motor apparatus and manufacturing method thereof

Life of this patent

Motor apparatus and manufacturing method thereof

Life of this patent

Abstract

Claims17