Patent ID: 8841802

Claim:
A motor actuator comprising: an electric motor that includes a yoke, which entirely receives a stator core and a rotor core therein, wherein the yoke includes a large diameter portion that extends circumferentially around a motor shaft, which is fixed to the rotor core to rotate integrally therewith, and the yoke rotatably supports the motor shaft through at least one bearing member that is directly held by the yoke; and a tubular housing that has a closed bottom at one end and extends circumferentially around the large diameter portion of the yoke, wherein: the housing is made of one of a resin material and a metal material and includes: a fitting blind hole, into which the large diameter portion of the meter yoke is loosely fitted; a groove that is radially outwardly recessed from an inner peripheral wall surface of the fitting blind hole; and first and second projections, which are formed integrally with the inner peripheral wall surface of the fitting blind hole and are circumferentially displaced from the groove, wherein the first and second projections radially inwardly project from the inner peripheral wall surface of the fitting blind hole to support the large diameter portion of the yoke; a spring having a different resiliency than the first and second projections is positioned in a gap between the large diameter portion of the yoke and the groove of the housing to radially urge the large diameter portion of the yoke against the first and second projections and thereby to resiliently radially support the large diameter portion of the yoke; and the groove of the housing includes an opening, which is formed at a location adjacent to an opening end of the fitting blind hole, and through which the spring is installed into the gap between the large diameter portion of the yoke and the groove of the housing.