Fuel pump having a pressure chamber vented via a ball valve to the fuel tank
First Claim
1. In a fuel pump driven by an internal combustion engine and adapted for attachment thereto, the pump being provided with a work chamber having an inlet suction valve and an outlet pressure valve, the improvement comprising a pressure chamber downstream of the work chamber and in communication therewith via the outlet pressure valve, a first connecting pipe extending in said pressure chamber for supplying fuel to a mixture-former of the engine, said pressure chamber having upper and lower regions, said first connecting pipe having an open lower end disposed in said lower region of the pressure chamber, a second connecting pipe connected to a fuel tank, and a ball valve means in the upper region of said pressure chamber for controlling communication between said pressure chamber and said second connecting pipe, said ball valve means comprising a ball suspended in said upper region of said pressure chamber to rise and fall therein depending on the density of the fluid in the pressure chamber such that when gaseous vapor is formed in said pressure chamber said ball falls and said connecting pipe is opened in said pressure chamber whereas without gaseous vapor, the liquid fuel raises the ball to close communication between the connecting pipe and the pressure chamber.
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Accused Products
Abstract
A fuel pump includes a connecting pipe having an open end disposed at the lowest point in a pressure chamber supplied with fuel by a pressure valve. The connecting pipe is connected to a mixture-former and the pressure chamber has in its upper region a ball valve with a return line which leads to a fuel tank. The pressure chamber can have a cavity establishing the lowest region thereof, the open end of the connecting size being disposed in the cavity. A filter can surround the lower end of the pipe to filter the fuel supplied thereto.
17 Citations
11 Claims
- 1. In a fuel pump driven by an internal combustion engine and adapted for attachment thereto, the pump being provided with a work chamber having an inlet suction valve and an outlet pressure valve, the improvement comprising a pressure chamber downstream of the work chamber and in communication therewith via the outlet pressure valve, a first connecting pipe extending in said pressure chamber for supplying fuel to a mixture-former of the engine, said pressure chamber having upper and lower regions, said first connecting pipe having an open lower end disposed in said lower region of the pressure chamber, a second connecting pipe connected to a fuel tank, and a ball valve means in the upper region of said pressure chamber for controlling communication between said pressure chamber and said second connecting pipe, said ball valve means comprising a ball suspended in said upper region of said pressure chamber to rise and fall therein depending on the density of the fluid in the pressure chamber such that when gaseous vapor is formed in said pressure chamber said ball falls and said connecting pipe is opened in said pressure chamber whereas without gaseous vapor, the liquid fuel raises the ball to close communication between the connecting pipe and the pressure chamber.
Specification
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- Resources
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Current AssigneePierburg GmbH (Rheinmetall AG)
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Original AssigneePierburg GmbH (Rheinmetall AG)
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InventorsKuhlen, Ernst
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Primary Examiner(s)Smith, Leonard E.
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Assistant Examiner(s)NOT, DEFINED
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Application NumberUS07/307,420Time in Patent Office519 DaysField of Search417/435, 417/413, 417/395, 417/306, 123/516, 123/514US Class Current417/435CPC Class CodesF02M 37/06 mechanically drivenF02M 37/20 characterised by means for ...
