Rotation assistance device, and assistance mechanism position adjustment mechanism for shaft support device

A rotation support device comprising:

• a rotation shaft;
• and
• a pair of support mechanisms that rotatably support both end portions in an axial direction of the rotation shaft, respectively,
• wherein one of the pair of support mechanisms includes
• a bearing unit including a bearing housing and a bearing that rotatably supports the rotation shaft with respect to the bearing housing and is configured to support a load in the axial direction,
• a support base through which the rotation shaft passes or disposed around the rotation shaft, and
• a housing position adjustment mechanism disposed between the bearing unit and the support base,
• wherein the housing position adjustment mechanism includes
• a support base side member provided on a support base side and through which the rotation shaft passes or disposed around the rotation shaft,
• a bearing housing side member provided on a bearing housing side, through which the rotation shaft passes or disposed around the rotation shaft, and movable in the axial direction relative to the support base side member,
• an elastic member disposed in a compressed state between opposing end surfaces in the axial direction of the support base side member and the bearing housing side member, and
• a damping member disposed between opposing surfaces of the support base side member and the bearing housing side member,
• wherein one of the support base side member and the bearing housing side member has an annular recessed portion that opens to one side in the axial direction,
• wherein the other of the support base side member and the bearing housing side member has an annular protruding portion that protrudes toward the other side in the axial direction and is fitted into the annular recessed portion in a slidable manner in the axial direction, and
• wherein the elastic member is a plurality of disc springs arranged in a compressed state between a bottom surface of the annular recessed portion and a tip end surface of the annular protruding portion.