The design of Internal Combustion Engine pursuits high power output, low fuel consumption¡Blow level acoustic and meet the demand of environment protection. In the combustion engine the Cam and Rocker Arm activate the intake and exhale of the engine. Currently majority design will utilize the rocker arm needle roller for less friction. Generally the design of the Rocker Arm Roller will use different materials to further reduce the mass. And the construction of the Rocker arm is also designed to reduce the mass and strengthen the structure. Special surface treatment is used to extend duration and lower friction and starting toque and keep the lubrication. Accordingly the lifespan can be extended.
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