Low-pressure system for common-rail injection system, has balancing volume formed between feed pump and fuel filter and limited by set of spring loaded input pistons, where pistons are switched parallel to change of balancing volume

摘要

#CMT# #/CMT# The system has a feed pump (1) for supplying fuel from a fuel tank (2) over a set of fuel lines (3) of a high pressure pump (4). A set of fuel filters (5) is arranged between the feed pump and the high pressure pump. An overflow valve (6) is arranged in a downstream of the feed pump and an upstream of the fuel filter to control pressure in the system. Balancing volume (7) is formed between the feed pump and the fuel filter and limited by a set of spring loaded input pistons. The pistons are switched parallel to the change of the balancing volume. #CMT# : #/CMT# The feed pump is designed as a gear pump. #CMT#USE : #/CMT# Low-pressure system for a fuel injection system i.e. common-rail injection system (claimed). #CMT#ADVANTAGE : #/CMT# The balancing volume is limited by the set of spring loaded input pistons, so that a piston loading spring is displaced when exceeding certain amount of pressure of the pistons against spring force, thus balancing increase of volume, and hence achieving effective compensation of loading spring pressure pulsations during appropriate design of mass and/or spring rate of the piston. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of a fuel injection system with a low-pressure system. 1 : Feed pump 2 : Fuel tank 3 : Fuel lines 4 : High pressure pump 5 : Fuel filters 6 : Overflow valve 7 : Balancing volume.