Spark ignition direct injection system
AssigneeRobert Bosch GmbH
InventorDewey McKinley Sims, Jr.
Life of this patent
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Abstract
A fuel injection system and method includes a cylinder head having an injector port. A fuel injector has a first end and a second end, the second end being received in the injector port. A fuel rail includes a socket for receiving the first end of the fuel injector. A spring assembly is coupled between the fuel rail and the injector to bias the injector toward the cylinder head. The spring assembly includes a housing, a spring in the housing, and a viscous material at least partially surrounding the spring in the housing. The spring assembly utilizes a squeeze film effect to resist movement of the injector in a direction toward the fuel rail. Preferably, the spring is comprised of a plurality of alternatingly-oriented disc springs, and the viscous material is a grease.
Claims25
A fuel injector assembly comprising:
- a fuel injector having a first end configured to communicate with a fuel source, a second end configured to communicate with a combustion chamber, and an outer surface extending between the first and second ends;
- and
- a spring assembly coupled to the outer surface between the first and second ends to bias the injector in the direction of the second end and resist movement of the injector in the direction of the first end when the injector is coupled between the fuel source and the combustion chamber, the spring assembly including
- a housing;
- a spring in the housing;
- and
- a viscous material at least partially surrounding the spring in the housing.
A fuel injection system comprising:
- a cylinder head having an injector port;
- a fuel injector having a first end and a second end, the second end being received in the injector port;
- a fuel rail having a socket, the first end of the fuel injector being received in the socket;
- and
- a spring assembly coupled between the fuel rail and the injector to bias the injector toward the cylinder head, the spring assembly including a housing, a spring in the housing, and a viscous material at least partially surrounding the spring in the housing, the spring assembly utilizing a squeeze film effect to resist movement of the injector in a direction toward the fuel rail.
A method of seating and maintaining a fuel injector in an injector port of a cylinder head, the fuel injector being sandwiched between a fuel rail and the cylinder head, the method comprising:
- coupling a spring assembly to the fuel injector between the cylinder head and the fuel rail, the spring assembly including a housing, a spring, and a viscous material contained in the housing;
- and
- substantially resisting the unseating of the injector from the injector port via a squeeze film effect created by the cooperation of the spring, the housing, and the viscous material.
Dependencies are inferred from the claim text.