Pressure controlled injector for injection systems with high pressure collecting area
AssigneeRobert Bosch GmbH
InventorHorst Harndorf
Life of this patent
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Abstract
The invention concerns an injection system for the injection of fuel into the combustion chambers of combustion engines. The injection system embraces a high pressure collecting area (5) (Common Rail), which is supplied across a high pressure pump (3) and provides fuel under high pressure to a number (n−1) of injectors (6, 21). The individual injectors 6, 21 each possess an injection nozzle (23) which is opened and closed by means of a vertically moveable nozzle pin (22). In a high pressure conduit (12) disposed after the high pressure collecting area (5) and leading to the injectors (6, 21) there is provided a first flowthrough valve (7). A run-off conduit (25, 31) is operated by means of a further flowthrough valve (26) disposed close to the nozzle.
Claims8
High-pressure fuel supply system for the injection of fuel into the combustion chambers of combustion engines of the type having a high pressure collecting the (5) which is supplied with pressure across a high pressure pump (3) and across which a plurality (n−1) of injectors (6, 21) are supplied with fuel under high pressure, and having a freely moveable nozzle (23) admitted into each individual injector (6, 21) which closes an injector nozzle (23), the improvement comprising a first flowthrough valve (7), a further flowthrough valve (26) and a run-off conduit (25, 31), said high pressure conduit (12) being connected with said run-off conduit (25, 31), said run-off conduit (25, 31) being disposed across said further flowthrough valve (26), said further flowthrough valve (26) being arranged in close proximity to said injection nozzle, and further comprising an input throttle element (19) disposed at the entry side of each (n−1) injectors (6, 21).
Dependencies are inferred from the claim text.