Mechanische Brennstoffpumpe

摘要

An engine driven fuel pump in which, on both sides of a piston 21, are working chambers 41, 42 which have a displacement ratio of approximately 2:1, so that the larger working chamber 41 delivers fuel via a delivery valve (49, Fig.2) into a recess 45, which is directly connected to the smaller working chamber 42 and, via a further delivery valve (50, Fig.2) to a delivery connection 48 leading to a consumer. In this way, a compact fuel pump is achieved, which delivers fuel in a manner which is virtually free from pressure fluctuations. Fuel is drawn into the larger working chamber 41 through a suction valve 34 connected by a depending intake tube 33 to a stabilizing chamber 30. A diaphragm 9 reciprocated in unison with the piston 21 pumps fuel from a suction connection 12 into the stabilizing chamber, the latter having a connection 29 for leading off fuel with entrained bubbles to a tank. <IMAGE>