| 摘要 |
The invention relates to a fuel feed system capable of feeding a fuel to fuel injection valves at a fuel pressure with improved stability. A fuel feed system for an internal combustion engine including a fuel tank (50) and a low-pressure pump (51) for feeding the fuel in the, fuel tank to fuel injection valves, is provided with a diaphragm type damper (80) having a wave-shape cross section at a position in contact with the fuel. Also, in a high-pressure fuel feed pump including a pressurizing chamber (12) for pressurizing the fuel, a plunger (2) for pumping the fuel within the pressurizing chamber (12), an intake valve (5) provided at a fuel inlet (10) of the pressurizing chamber (12), a discharge valve (6) provided at a fuel outlet (11) of the pressurizing chamber (12), and a low-pressure chamber provided in an upstream of the intake valve (5), a mechanism for reducing fuel pressure pulsation is disposed in a space of the low-pressure chamber provided in the upstream of the intake valve (5), and a fuel pressure sensor (56; 90) for measuring the fuel pressure is mounted near the mechanism for reducing fuel pressure pulsation. |
