Patent ID: 7165301
Filing Date: 2007-01-23
Classification: B62K,Y10T

Abstract:
1. A method for producing a swing arm assembly of an offroad motorcycle, the method comprising hydroforming a first arm, hydroforming a second arm, casting a bridge portion, securing the first arm and the second arm to the bridge portion, wherein hydroforming the first and second arms comprises placing a tubular pipe within a die cavity defined within a die, closing the die, introducing a fluid into an internal space of the tubular pipe, pressurizing the fluid to a sufficient level such that the tubular pipe conforms to substantially the size and shape of the cavity and forging at least one wheel support member, welding the at least one first wheel support member to one of the first arm and the second arm, wherein the die comprises a first portion and a second portion, the first and second portions joining along a generally diagonal parting plane, the parting plane being positioned to extend through an upper and inner edge of the first and second arms and through a lower and outer edge of the first and second arms.