Study on Friction Characteristics of Cam and Follower for Direct-type Valve Train

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  • 直接駆動式動弁系カム・フォロワの摩擦特性に関する研究
  • チョクセツ クドウシキ ドウベンケイ カム フォロワ ノ マサツ トクセイ ニ カンスル ケンキュウ

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Abstract

Regarding the cam and valve-lifter with an offset shim for the direct-type valve train in engines, the friction diagram, characteristics and their changes with the test duration have been examined with the test rig, so that effects of the shim surface finish, coating, running-in and contact mechanism on the reduction of friction have been evaluated. Mainly the followings were made obvious. (1)The effect of the surface finish with smaller roughness like an ELID mirror face grind is very large,but that of DLC coating is not so karge. (2)The shim rotaion by the traction force of cam changes the contact mechanism from the sliding to the rolling to make the friction lower. (3)The design is required to promote the formation of hydrodynamic lubricating oil-film between the shim and the valve-lifter.

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