Motor apparatus and manufacturing method thereof
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.
1. 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,
wherein
the gear cover is integrally provided with the seal member by a two-color molding,
the flat-plate main body is integrally provided with a gate portion which is formed by supplying molten rubber to one side surface of the gear cover in a vertical direction, and
an overflow portion, which extends from one side surface of the gear cover to the other side surface of the gear cover, is provided at a collision area of the flat-plate main body, at which flows of molten rubber collide to each other.
2. The motor apparatus according to claim 1 , wherein
at least one of the first lip portion and the second lip portion is formed by multistory lip segments aligned in an axial direction of the output shaft.
3. The motor apparatus according to claim 1 , wherein
the seal member has an anchor portion which is stopped on the other side surface of the gear cover via a mounting hole of the gear cover.
4. The motor apparatus according to claim 2 , wherein
the seal member has an anchor portion which is stopped on the other side surface of the gear cover via a mounting hole of the gear cover.
5. The motor apparatus according to claim 1 , wherein
the gear cover has a stopping claw for securing the gear cover to the gear case.
6. The motor apparatus according to claim 2 , wherein
the gear cover has a stopping claw for securing the gear cover to the gear case.
7. The motor apparatus according to claim 3 , wherein
the gear cover has a stopping claw for securing the gear cover to the gear case.