Patent ID: 11913414
Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A cam used for a fuel injection pump that increases a pressure of a fuel supplied into a fuel supply chamber by moving a plunger in an axial direction, the cam comprising:
a first cam surface in which an increase rate of a speed of the plunger in the axial direction when the cam rotates at a constant speed is a first increase rate during a pre-stroke period until a pressure increasing start position at which the plunger increases the pressure of the fuel in the fuel supply chamber; and
a second cam surface in which the increase rate of the speed of the plunger in the axial direction when the cam rotates at the constant speed is a second increase rate during a pressure increasing period which is a period after the plunger starts to increase the pressure of the fuel in the fuel supply chamber,
wherein the first increase rate is set to be higher than the second increase rate, and
the first increase rate is constant during the pre-stroke period until the pressure increasing start position.