Roller for high pressure pump of fuel injection system has external periphery surface having central and outer external periphery regions with different material and/or surface structure

摘要

The roller has external periphery surface (1) having central and outer external periphery regions (2,3) with different material and/or surface structure. The diameter and static friction of the outer external periphery regions are more than that of the central external periphery region. A peripheral groove is formed in outer external periphery regions. An independent claim is included for high pressure pump.