Fuel pressure regulator of fuel injection system
AssigneeNissan Motor Co., Ltd.
InventorsYoshiyuki Ishida, Seikoh Satoh
Life of this patent
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Abstract
A fuel pressure regulator for use in a fuel injection system of a gasoline fueled engine, comprises a fuel distributor pipe having an inlet and a plurality of outlets connected to fuel injections, a casing secured to a portion of the fuel distributor pipe, a diaphragm member secured between the portion of the distributor pipe and the casing, and a fuel discharge nozzle disposed interiorly of the distributor pipe to discharge the fuel out of the distributor pipe, so that the possibility of fuel leakage in the piping of the fuel injection system is effectively decreased, rendering easier assembly of the fuel injection system and lowering the production cost of the same.
Claims7
A fuel pressure regulator for use in a fuel injection system of a gasoline fueled internal combustion engine, said fuel pressure regulator comprising:
- a fuel distributor pipe defining therein a fuel chamber, having a fuel inlet through which the fuel chamber communicates with a fuel source, and a plurality of fuel outlets equal to the number of fuel injectors, said fuel outlets communicating with the fuel chamber, and both ends of said fuel distributor pipe being open;
- a plurality of fuel supply conduits, each fuel supply conduit directly connecting one of said outlets with a fuel injector;
- a casing directly connected to said fuel distributor pipe to constitute an integral unit, said casing defining therein a vacuum chamber which communicates with an intake passageway of the engine;
- a diaphragm member secured at a section where said distributor pipe and said casing are connected to each other, to separate said fuel chamber and said vacuum chamber, said diaphragm member being provided with a valve member;
- a fuel discharge nozzle through which the fuel in said fuel chamber is dischargeable, said nozzle being disposed in said fuel chamber and closable with said valve member to prevent the fuel in said fuel chamber from being discharged out of said fuel chamber;
- and
- damper means communicating with said fuel chamber for absorbing the fuel pressure pulsation applied to the fuel in said fuel chamber of said fuel distributor pipe, said damper means including first and second dampers which are respectively provided at both open end portions of said fuel distributor pipe, each of said dampers including a diaphragm member secured to close the open end portion of said fuel distributor pipe.
A fuel injection system for a gasoline fueled internal combustion engine, comprising:
- a plurality of fuel injectors including one for each cylinder of the engine;
- a fuel source comprising a fuel tank;
- means for supplying fuel from said fuel tank to each of said fuel injectors, said fuel supply means comprising a fuel pump and a fuel pressure regulator, wherein said fuel pressure regulator comprises:
- a fuel distributor pipe defining therein a fuel chamber, having a fuel inlet through which the fuel chamber communicates with a fuel source, and a plurality of fuel outlets equal to the number of fuel injectors, said fuel outlets communicating with the fuel chamber, and both ends of said fuel distributor pipe being open;
- a plurality of fuel supply conduits, each fuel supply conduit directly connecting one of said outlets with a fuel injector;
- a casing directly connected to said fuel distributor pipe to constitute an integral unit, said casing defining therein a vacuum chamber which communicates with an intake passageway of the engine;
- a diaphragm member secured at a section where said distributor pipe and said casing are connected to each other, to separate said fuel chamber and said vacuum chamber, said diaphragm member being provided with a valve member;
- a fuel discharge nozzle through which the fuel in said fuel chamber is dischargeable, said nozzle being disposed in said fuel chamber and closable with said valve member to prevent the fuel in said fuel chamber from being discharged out of said fuel chamber;
- and
- damper means communicating with said fuel chamber for absorbing the fuel pressure pulsation applied to the fuel in said fuel chamber of said fuel distributor pipe, said damper means including first and second dampers which are respectively provided at both open end portions of said fuel distributor pipe, each of said dampers including a diaphragm member secured to close the open end portion of said fuel distributor pipe.
Dependencies are inferred from the claim text.