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1. (EP1342911) Fuel feed system
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Claims

1. A high-pressure fuel feed pump comprising
a pump body (1) having a pressurizing chamber (12) for pressurizing a fuel;
a plunger (2) for feeding the fuel by force in 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 said pressurizing chamber (12); and
a low-pressure chamber (10a) provided in an upstream of said intake valve (5),
wherein a mechanism for reducing fuel pressure pulsation is disposed in a space of a low-pressure chamber provided in the upstream of said intake valve (5),
characterized in that said mechanism is a diaphragm type damper (80) in which a gas is sealed up between two diaphragms (80a, 80b), wherein said diaphragm (80a, 80b) is configured to be a substantially convex shape, and two of the diaphragms (80a, 80b) are connected forming a shape like a convex lens.
  2. The high-pressure fuel feed pump according to claim 1,
wherein a fuel pressure sensor (90) is provided for measuring the fuel pressure being mounted on a case (81) to which said mechanism for reducing fuel pressure pulsation is secured.
  3. The high-pressure fuel feed pump according to claim 1,
wherein said diaphragm type damper (80) is formed by connecting two diaphragms (80a, 80b) with an annular member inserted between the diaphragms.
  4. The high-pressure fuel feed pump according to claim 1,
further comprising a diaphragm type damper (80),
wherein at least one of said two diaphragms (80a, 80b) has a wave-shape cross section.
  5. The high-pressure fuel feed pump according to claim 1,
wherein said diaphragm (80a, 80b) is a metal diaphragm made of metal.
  6. The high-pressure fuel feed pump according to claim 4,
wherein peripheries of said two diaphragms (80a, 80b) are welded together.
  7. The high-pressure fuel feed pump according to claim 1,
wherein a pressure of a gas (80c) to be sealed up between the two diaphragms (80a, 80b) is not smaller than a minimum working fuel pressure and not greater than a maximum working fuel pressure.
  8. The high-pressure fuel feed pump according to claim 1,
wherein a fuel chamber (10b, 10c) is provided on each surface of said two dampers (80a, 80b).
  9. The high-pressure fuel feed pump according to claim 7,
wherein said damper (80) is secured via an elastic body (84a, 84b) of a wavelike shape.
  10. A fuel-feed system for an internal combustion engine having
a high-pressure fuel feed pump according to claim 1, comprising a fuel tank (50); and
a low-pressure pump (51) for feeding a fuel in said fuel tank (50) to a fuel injection valve.