Wenderoth, Lind & Ponack, L.L.P.
Tube provided with branch tube, shock absorber, and method for making them
A shock absorber includes a cylinder sealingly containing oil, and a piston coupled with a piston rod and inserted in the cylinder. The shock absorber generates a damping force by controlling an oil flow generated according to a movement of the piston with use of a damping force generation mechanism. A separator tube is externally disposed around the cylinder. The oil is transmitted into the damping force generation mechanism via a branch tube integrally formed on a cylindrical sidewall of the separator tube. The branch tube is formed on the cylindrical sidewall of the separator tube by burring processing. Both sides of a proximal portion of the branch tube in a circumferential direction of the cylindrical sidewall of the separator tube are pressed from an interior to concave an inner circumferential surface radially outwardly, thereby forming recesses.
HITACHI AUTOMOTIVE SYSTEMS, LTD.
F Y F
F16F Y10T F16F
inventional additional inventional
Takayuki Makoto
Ohno Nishimura