Patent ID: 7424834

Claim:
A gear comprising: a transmission gear part, and a hub synchro axially projected from a side surface of the transmission gear part, said hub synchro having first parts projecting axially from the side surface of the transmission gear part, and second parts projecting axially from the side surface of the transmission gear part and located between adjacent ones of said first parts, wherein said first parts have forged spline teeth formed on an outer peripheral surface of said first parts said first and second parts together form a complete circle, a plurality of forged key holes formed at said second parts of the hub synchro and extending entirely through a radial thickness of the wall of said hub synchro, said forged key holes extending to an axial end of said hub synchro opposite said transmission gear part, wherein said forged spline teeth of said hub synchro are not formed at circumferential positions of said second parts of said hub synchro where said forged key holes are provided, wherein said hub synchro is coaxially provided with said transmission gear part, the diameter of said hub synchro being smaller than that of said transmission gear part, and wherein the axial height of said second parts of said hub synchro located between two adjacent first parts of said hub synchro is smaller than the axial height of said first parts of said hub synchro.