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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
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
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.
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