Patent ID: 8047342

Claim:
A strut shock absorber, comprising: a cylindrical outer shell; and a knuckle bracket including a curved portion in close contact with the outer shell, the curved portion having, at an axial end thereof, a reinforcing flange formed by bending a portion of the axial end of the curved portion outward, the reinforcing flange having an inner circumferential surface welded onto the outer shell and an outer circumferential surface having an inflection start point and an inflection end point, a no-flange portion located adjacent to the reinforcing flange and welded onto the outer shell, an axial distance along an axis of the knuckle bracket from the inflection starting point to the inflection end point being set to be equal to an axial distance from the inflection starting point to the no-flange portion, and an insulation portion located between the reinforcing flange and the no-flange portion, and including a cutout disposed on the axial end of the curved portion between the reinforcing flange and the no-flange portion, the cutout having a portion that starts from the no-flange portion and extends in an axial direction away from the reinforcing flange.