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发明申请
US20120255508A1 Valve Lifter of Internal Combustion Engine and Method of Fabricating the Valve Lifter 审中-公开
内燃机气门升降机及其制阀方法

Valve Lifter of Internal Combustion Engine and Method of Fabricating the Valve Lifter
摘要：
A valve lifter including a cylindrical portion, a crown portion having a crown surface, a chamfered portion formed on an outer periphery of the crown portion adjacent to an outer peripheral edge of the crown surface and tapered toward the crown surface, and a hard carbon film covering only the crown surface and the chamfered portion. The chamfered portion has a taper angle with respect to an outer peripheral surface of the cylindrical portion on which the hard carbon film is not formed, the taper angle being set to not more than 26.5°. The chamfered portion has a length extending from on a side of the crown surface toward a side of the cylindrical portion in an axial direction of the cylindrical portion, the length being set to not less than 1 mm.
摘要（中）：

一种气门挺杆，包括圆柱形部分，具有冠部表面的冠部分，形成在冠部的外周上邻近冠部表面的外周边缘并朝向冠部表面逐渐变细的倒角部分，以及硬碳膜 仅覆盖冠表面和倒角部分。 倒角部相对于未形成硬碳膜的圆筒部的外周面成锥角，锥角设定为26.5°以下。 所述倒角部具有从所述冠面的一侧沿所述圆筒部的轴向朝向所述圆筒部的一侧延伸的长度，所述长度被设定为不小于1mm。

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