Patent Application
20110186152
The invention relates to fuel supply systems and, more particularly, to a compact flow-through fuel pressure regulator for directing flow of fuel within the fuel system.
Most modern automotive fuel systems use fuel injectors to deliver fuel to the engine cylinders for combustion. The fuel injectors are mounted on a fuel rail to which fuel is supplied by a fuel pump. The pressure at which the fuel is supplied to the fuel rail must be metered to ensure the proper operation of the fuel injector. Metering is carried out by using a pressure regulator that controls the pressure of the fuel in the system at all engine RPM levels.
With reference to
While such pressure regulators have been proven satisfactory, they require either a great number of parts or large parts.
Thus, there is a need to provide an improved fuel pressure regulator with fewer and smaller parts than conventional regulators to reduce the material and manufacturing costs thereof.
An object of the present invention is to fulfill the need referred to above. In accordance with the principles of an embodiment, this objective is obtained by providing a flow-through pressure regulator including a body having a fuel inlet and a fuel outlet and defining a fuel chamber there-between. A valve seat is defined in the body generally at the fuel outlet. A valve element is movable between open and closed positions. The valve element has a seating surface that engages the valve seat in the closed position to prevent fuel from passing through the fuel outlet. A housing has a proximal end coupled to the body. A distal end of the housing has at least one housing fuel outlet therein. A coil compression spring has first and second ends. The spring is disposed between the valve element and the housing and is constructed and arranged to bias the valve element to the closed position in opposition to pressure exerted on the valve element by fuel in the fuel chamber. The valve element includes a spring engaging surface that engages one end of the spring and the housing includes spring retaining structure engaging the other end of the spring. The spring is constructed and arranged to permit the valve element to move from engagement with the valve seat to the open position thereof when a certain pressure builds in the fuel chamber, thereby permitting the fuel outlet of the body to communicate with the housing fuel outlet.
Other objects, features and characteristics of the present invention, as well as the methods of operation and the functions of the related elements of the structure, the combination of parts and economics of manufacture will become more apparent upon consideration of the following detailed description and appended claims with reference to the accompanying drawings, all of which form a part of this specification.
The invention will be better understood from the following detailed description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like parts, in which:
Referring to
Valve element 26′ is preferably a half-spherical member having a convex seating surface 36 that selectively engages the valve seat 24′. In particular, sealing surface 38 that defines the valve seat 24′ is preferably a concave annular surface, coined into the body 20′ by a forming member or by the valve element 26′. The sealing surface 38 mates with the convex seating surface 36 of the valve element 26′ in a closed position thereof preventing fuel flow past the valve seat 24′. The valve element 26′ is biased into the closed position by a compression spring 40, preferably a coil spring, that is held in place at one end 42 thereof by spring retaining structure, preferably in the form of a detent 44 in a housing 46 of the regulator 10′. The detent 44 extends towards the valve element 26′.
As shown in
The generally cylindrical housing 46 is fixedly coupled at proximal end 56 thereof to an outer periphery of the tube body 20′. Thus, the body 20′ and the housing 46 are aligned along common axis A. The proximal end 56 of the housing 46 is an open end. A distal end 58 of the housing 46 is a generally closed end that includes at least one housing fuel outlet 60 therein. Thus housing 46 defines a chamber 57 that encloses the spring 40. Chamber 57 communicates with the fuel chamber 22′ when the valve element 26′ is in the open position.
Pressurized fuel flows into and accumulates in the fuel chamber 22′ and contacts the surface 36 of the valve element 26′. When the fuel pressure is sufficient to overcome the biasing force of spring 40, the pressurized fuel will push the valve element 26′ off the valve seat 24′ into the open position. Fuel then flows through the fuel outlet 25 of the body 20′ and through the housing fuel outlets 60 in housing 46.
The pressure regulator 10′ does not require a spring cover as does the regulator 10 of
The foregoing preferred embodiments have been shown and described for the purposes of illustrating the structural and functional principles of the present invention, as well as illustrating the methods of employing the preferred embodiments and are subject to change without departing from such principles. Therefore, this invention includes all modifications encompassed within the spirit of the following claims.
