Linear-motion rotation drive device and manufacturing method of linear-motion rotation drive device

A linear-motion rotation drive device comprising:

• an output shaft;
• a linear-motion drive unit that moves the output shaft in an axial direction;
• a rotation drive unit that rotates the output shaft around an axis;
• and
• an output shaft bearing coaxially supporting the output shaft to be movable in the axial direction and to transmit rotation of the rotation drive unit to the output shaft;
• wherein
• the rotation drive unit is a rotary motor and includes:
• an annular rotor with an inner diameter dimension that is larger than an outer diameter dimension of the output shaft bearing;
• and
• a pair of rotor bearings holding the rotor to be rotatable around the axis at positions spaced apart in the axial direction;
• the output shaft bearing is fixed to the rotor in a state in which there is a gap in a radial direction between the output shaft bearing and the rotor on an inner circumferential side of the rotor;
• and
• the output shaft bearing and the rotor rotate integrally.