| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce friction of a rocking part and a rotation part, the size of a locker arm, and the size of a decompression cam, in a structure of rocker arm 57 of a valve system provided between a camshaft 53 of an internal combustion engine 15 and a valve 45, 47 which opens/closes an intake port 42 or an exhaust port 43. <P>SOLUTION: In a structure of the rocker arm 57, characteristically, a rolling bearing 68 for supporting a support hole 67 in a rocker arm 57 is of a type wherein a plurality of needles 70 are mounted on an inner side of an outer peripheral shell 69, and the outer peripheral shell 69 is fixed to the support hole 67, a cam follower 58 includes an outer ring 74 which is supported on a periphery of a cam follower shaft 72 which is held by a pair of left and right arm portions 66 of the rocker arm 57 by way of a plurality of rollers 73, a position of the outer ring 74 and a position of the rollers 73 in the lateral direction are restricted by the arm portion 66, and an outer diameter Dr of the outer ring 74 is set equal to or less than an inner diameter Dh of the support hole 67. <P>COPYRIGHT: (C)2012,JPO&INPIT |
