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An improved pump and motor assembly is utilized to regulate a flow of fuel to an internal combustion engine. All of the fluid connections to the pump are connected with one end of the assembly. The pump and motor are both enclosed within a one-piece casing having a tubular side wall which is integra

An improved pump and motor assembly is utilized to regulate a flow of fuel to an internal combustion engine. All of the fluid connections to the pump are connected with one end of the assembly. The pump and motor are both enclosed within a one-piece casing having a tubular side wall which is integrally formed with an end wall. The end section to which all of the fluid connections for the pump are made, is connected across the open end of the tubular side wall. To provide for the removal of vapor bubbles from the fuel, fuel supplied under pressure from the tank flows through an inlet cavity which circumscribes the pump and has an axial extent which is equal to the length of the pump. In addition, a screen at the inlet of the pump itself blocks the flow of vapor bubbles from the inlet cavity to the pump. The forces applied against opposite sides of the moving components of the pump by the inlet fluid are substantially balanced. Fluid pressure pulses in fuel discharged from the pump are dampened in an outlet cavity by a seal member which sealingly engages an outer cheek plate of the pump to separate the inlet and outlet cavities. A single spring element is utilized to perform the dual functions of pressing the seal member into engagement with the outer cheek plate of the pump and to press the outer cheek plate and cam ring against the inner cheek plate.

대표청구항 ▼

A pump and motor assemby for use in regulating a flow of metal from a source of fuel to an operating chamber of an engine of a vehicle, said pump and motor assembly comprising a casing having an opening at one end, electric motor means disposed within said casing for providing an output force upon t

A pump and motor assemby for use in regulating a flow of metal from a source of fuel to an operating chamber of an engine of a vehicle, said pump and motor assembly comprising a casing having an opening at one end, electric motor means disposed within said casing for providing an output force upon transmittal of electrical power to said electric motor means, said electric motor means including a stator fixedly connected with said casing and a rotatable armature circumscribed by said stator and having an output end portion, pump means disposed within said chamber in a coaxial relationship with said motor means for pumping fuel, said pump means including a cam ring, a rotor disposed within said cam ring and connected with said output end portion of said armature for rotation therewith, a plurality of pumping elements connected with said rotor for rotation therewith, said pumping elements and cam ring cooperating to partially define a working chamber having an inlet area and an outlet area, said pump means further including an inner cheek plate disposed between said rotor and said electric motor means, said inner cheek plate cooperating with said rotor and cam ring to further define said working chamber, and an outer cheek plate disposed on a side of said rotor and cam ring opposite from said inner cheek plate, said outer cheek plate cooperating with said rotor and cam ring to still further define said working chamber, said pump and motor assembly further including an end section fixedly connected across the open end of said casing, inlet passage means formed in said end section for receiving fuel from the source of fuel, said end section at least partially defining an inlet cavity connected in fluid communication with said inlet area of said working chamber and said inlet passage means to receive fuel from said inlet passage means, outlet passage means formed in said end section for receiving fuel discharged from said working chamber, said outlet passage means being connected in fluid communication with the engine operating chamber to enable fuel discharged from said working chamber of said pump means to be conducted to said engine operating chamber, said end section at least partially defining an outlet cavity connected in fluid communication with said outlet area of said working chamber and said outlet passage means to receive fuel discharged from said working chamber, and seal and pressure pulse dampening means disposed between said end section and pump means for preventing fluid flow between said inlet and outlet cavities and for at least partially dampening pressure pulses in fuel discharged from said working chamber, said seal and pressure pulse dampening means including a resilient member disposed in sealing engagement with said end section and said outer cheek plate to block fluid communication between said inlet and outlet cavities, said resilient member being resiliently flexible in a direction toward said inlet cavity under the influence of fluid pressure pulses in said outlet cavity to at least partially dampen the fluid pressure pulses, and spring means disposed between said resilient member and said end section for pressing said resilient member into tight sealing engagement with said outer cheek plate.