| 摘要 |
<p>PUMP AND MOTOR ASSEMBLY An improved pump and motor assembly is utilized to regulate a flow of fuel to an internal combustion engine. The pump and motor are enclosed within a one-piece casing having a tubular side wall. An end section, to which all of the fluid connections for the pump are made, is connected across the open end of the tubular side wll. 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. Vapor bubbles in the fuel gravitate upwardly toward the entrance to a fuel return passage through which the vapor bubbles and excess fuel are returned to the tank. 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 engges 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.</p> |
