abstract |
In a conventional valve operating apparatus for an engine, it has been desired to reduce friction at a sliding contact portion in order to realize further performance enhancement of the engine. A valve operating apparatus for an engine that opens and closes an intake valve 5 via a main rocker arm 6 by a rotating low speed cam 2, wherein a sliding contact portion between the main rocker arm 6 and the low speed cam 2, a main rocker arm In the sliding contact portion between the main rocker shaft 4 and the main rocker shaft 6 and the sliding contact portion between the main rocker arm 6 and the intake valve 5, a hard carbon film is formed on at least one sliding contact surface to greatly increase the sliding contact portion. Realized a reduction in friction. [Selection] Figure 1 |