Patent attributes
The fluid damper device (10) has the rotor (30) which is inserted to the bottomed cylindrical case (20) and the cover (60) which is fixed to the opening portion (29) of the case (20). The welding protrusions (80) which are to be welded to the cover (60) are formed on the inside circumferential surface of the case (20) and spaced out in the circumferential direction. On the other side (L2) in the axial (L) direction of the welding range (X), within which the welding protrusions (80) and the cover are welded together, the first outflow prevention portion (91L, 91R) is formed. On the other side (L2) of the first outflow prevention portion (91L, 91R) in the axial (L) direction, the arc-shaped step surface (76) which functions as the outflow regulation portion (95) is provided to regulate the resin protruded and prevented it from reaching the position of the R-ring (49).
