Fuel injection apparatus
AssigneeRobert Bosch GmbH
InventorsErnst Linder, Helmut Rembold, Manfred Wier
Life of this patent
Estimating the term…
Abstract
In a fuel injection apparatus having an injection nozzle opening at predetermined pressure, to which fuel is deliverable under pressure, the injection nozzle chamber communicates with a fuel supply line with the interposition of a check valve closing outward; the pressure in the fuel supply line is lower than the opening pressure of the injection nozzle. Furthermore, the injection nozzle chamber communicates with a work chamber of a spring-loaded work piston, the displacement motion of which for increasing the pressure in the nozzle chamber above the opening pressure of the injection nozzle is effected by relieving a second work chamber of the spring-loaded work piston under the influence of spring force.
Claims19
A fuel injection apparatus having an injection nozzle opening at predetermined pressure, to which fuel is deliverable under pressure, comprising an injection nozzle chamber (2) communicating with a fuel supply (8, 40) provided with a check valve (9, 37, 41) closing toward the outside, said check valve adapted to maintain a pressure in the fuel supply line (8, 40) lower than an opening pressure of the injection nozzle, the injection nozzle chamber (2) further communicating with a first work chamber (14) of a spring-loaded work piston (12, 43, 44), said spring-loaded work piston having an associated second work chamber (20) subject to spring loading from said work piston, said spring-loaded work piston being adapted to be displaced to increase pressure in the nozzle chamber (2) above the opening pressure of the injection nozzle (1) by relieving pressure in said second work chamber (20).
Dependencies are inferred from the claim text.