Rotation assistance device, and support mechanism position adjusting 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, and
• a working fluid in a compressed state filling a pressure chamber formed between the support base side member and the bearing housing side member, and
• wherein the pressure chamber is sealed off from outside.