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Fuel injector with inner chamber vacuum

  • US 4,485,789 A
  • Filed: 07/31/1981
  • Issued: 12/04/1984
  • Est. Priority Date: 07/31/1981
  • Status: Expired due to Fees
First Claim
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1. A fuel injector having metering and injection modes of operation and adapted to receive fuel from a first and a second source of pressurized fuel for injecting a pre-metered quantity of fuel into a diesel engine comprising:

  • a housing having a first port adapted to communicate with the first pressure source and a second port adapted to communicate with the second pressure source;

    intensifier piston means reciprocatively received within said housing for defining an upper, a middle and a lower variable volume chamber therebetween; and

    means for permitting a predetermined first quantity of fuel to be received within said middle chamber during the injection mode of operation, and for reducing thereafter the pressure level of said first quantity of fuel within said middle chamber to a first pressure level and for pressurizing said first quantity of fuel during said injection mode of operation.

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