Pressure booster and fuel injection system with a pressure booster
AssigneeRobert Bosch GmbH
InventorMartin Kropp
Life of this patent
Estimating the term…
Abstract
A pressure booster for increasing the injection pressure in direct-injection internal combustion engines with a plurality of cylinders, in particular diesel engines, having a booster piston which has a relatively large end face that is subjected to a relatively low pressure and a relatively small end face at which in the pumping stroke an elevated injection pressure prevails, wherein on the side remote from the relatively large end face, because of the difference in size between the two end faces of the booster piston, an idle volume results. The idle volume is in communication with a cantilevered spring reservoir disposed locally for each individual cylinder or centrally for all the cylinders of the engine.
Claims6
A pressure booster for increasing the injection pressure in direct-injection internal combustion engines with a plurality of cylinders, in particular diesel engines, said booster comprising a booster piston (3) which has a relatively large end face that is subjected to a relatively low pressure and a relatively small end face at which in the pumping stroke an elevated injection pressure prevails, an idle volume space on the side of said booster remote from the relatively large end face resulting from the difference in size between the two end faces of the booster piston (3), said idle volume (20) being connected in communication with a cantilevered spring reservoir (22), disposed locally for each individual cylinder or centrally for all the cylinders of the engine.
Dependencies are inferred from the claim text.