Actuator and method for manufacturing the same

An actuator comprising:

• a motor configured to generate an output power;
• a deceleration mechanism configured to decelerate rotation of the motor;
• and
• a housing accommodating the motor and the deceleration mechanism, wherein
• the housing is configured to be screwed to and affixed to a support portion of an affixing member,
• the deceleration mechanism includes a support axis extending in a direction, which is perpendicular to an axial direction of an output shaft of the motor,
• the housing includes a case and a cover,
• the case is in a bottomed tubular shape and has an opening, an accommodation chamber, and a holder portion,
• the opening opens in a radial direction of the motor and in an axial direction of the support axis, the opening being configured to open on a side of the support portion,
• the accommodation chamber extends from the opening toward a bottom,
• the holder portion surrounds the bottom of the accommodation chamber and is in contact with the motor,
• the cover is mounted to the case to surround the opening,
• the cover has a biasing portion, which forms a hollow portion with the holder portion, the hollow portion accommodates at least the motor,
• the motor and the deceleration mechanism are mountable to the accommodation chamber in one direction from a side of a mounting surface of the case,
• the housing has the mounting surface, which is configured to be mounted to the support portion,
• the actuator further comprising:
• an elastic sealing member formed of an elastic material and mounted to the mounting surface, wherein
• the elastic sealing member is configured to be tightly in contact with the support portion to seal a clearance between the mounting surface of the housing and the support portion,
• the elastic sealing member has a projection height H1, before the housing is mounted to the support portion,
• the cover has a projection height H2, before the housing is mounted to the support portion, and
• the case has a projection height H3, before the housing is mounted to the support portion, wherein
• the projection height H1, the projection height H2, and the projection height H3 satisfy the following relation:
• H1>H2>H3.