公开(公告)号：US20180347411A1

公开(公告)日：2018-12-06

申请号：US15761698

申请日：2017-03-13

Applicant: MAZDA MOTOR CORPORATION

Inventor： Youji ASAKURA ,  Hideo TONE ,  Akira ASAI ,  Michihiro KANAMURA ,  Shoichi FURUYA

IPC: F01L1/047 ,  B22D25/02 ,  B22C9/22 ,  B22C9/02 ,  B22C7/00 ,  F16H53/02

CPC classification number: B22C7/00 ,  B22C1/00 ,  B22C9/02 ,  B22C9/22 ,  F01L1/04 ,  F16C3/18

Abstract: This exhaust cam shaft (2) is provided with a shaft part (5) and cam parts (6 to 13) provided on the outer circumference of the shaft part (5). The shaft part (5) has holes (16, 17, 19) opened at predetermined positions on the outer circumferential surface of the shaft part (5). The holes (16, 17, 19) are formed so as to be gradually tapered from an outside of the shaft part (5) toward a center of the shaft part (5) in a radial direction.