| 摘要 |
This rotational drive device (10A) is provided with: a rotational body (16); a housing (12) having an installation hole (14) formed therein; a fluid supply part (18); a movement restriction part (24); and an output shaft (22). A gap (S) through which a working fluid flows is formed between the outer circumferential surface of the rotational body (16) and the inner circumferential surface of the installation hole (14). As a result of the action of the working fluid, the rotational body (16) is brought into contact with the inner circumferential surface of the installation hole (14) in a state in which the axial line (Ax) of the rotational body (16) is slanted with respect to the centre line (L) of the installation hole (14). The flow path cross-sectional area of the gap (S) expands so as to be greater than one end of the rotational body (16) at the downstream side. |
