To ascertain required durability as well as improving productivity and substantially lightening.
This hollow integrated cam shaft is provided with a hollow shaft body 2 and a cam 10 having a cam ramp 11 and a cam nose 12 extending from the cam ramp 11. The cam 10 is provided with a cam backing section 10A having a cam nose backing section 12A, which is swelledly and integrally formed in the shaft body 2 and has a cam ramp backing section 11A and the cam nose backing section 12A extending from the ramp backing section 11A, a groove 13, which is formed extending to the cam lamp backing section 11A of the cam backing section 10A and the cam nose backing section 12A, a cam ramp 11, which is built up on the groove 13 and has sliding faces 11a and 12a, and a built-up layer 14 comprising an abrasion resistant material forming the cam nose 12.
MINAMIYAMA HIDEO
SUZUKI KENJI
KANO MAKOTO
SAKAMOTO HIRONORI
NISSAN MOTOR