Extended pump-valve-nozzle unit having hydraulic-mechanical translation
AssigneeRobert Bosch GmbH
InventorsAnja Melsheimer, Matthias Beck, Manfred Mack
Life of this patent
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Abstract
The invention relates to a fuel injection apparatus for an internal combustion engine, having an injection valve that protrudes into the combustion chamber of the engine. This valve communicates with a valve chamber in that a control part closes and opens inlet bores for fuel that is at high pressure. The control part is actuatable by means of a hydraulic-mechanical booster. The pump part, valve part and nozzle part of the fuel injection apparatus are disposed in a vertical arrangement, hydraulically in line with on another in terms of the fuel flow.
Claims9
A fuel injection apparatus for an internal combustion engine having:
- a pump part (P):
- a nozzle part (D) with an injection nozzle (14) protruding into the combustion chamber of the engine, which nozzle is in communication with a valve chamber (6.1);
- and a valve part (V) in which a control part (6) closes and opens inlet bores (5, 8) for fuel that is at high pressure, and the control part (6) is actuatable by means of a hydraulic-mechanical booster (18, 19, 20, 21), the improvement wherein the pump part (P), the valve part (V) and the nozzle part (D) of the fuel injection apparatus (1) are disposed in a vertical arrangement, hydraulically in line with one another in terms of the fuel flow, wherein the ratio of the lengths l1:l2 of the inlet bores (5, 8) relative to one another is between 1:4 and 1:6.
A fuel injection apparatus for an internal combustion engine having:
- a pump part (P):
- a nozzle part (D) with an injection nozzle (14) protruding into the combustion chamber of the engine, which nozzle is in communication with a valve chamber (6.1);
- and a valve part (V) in which a control part (6) closes and opens inlet bores (5, 8) for fuel that is at high pressure, and the control part (6) is actuatable by means of a hydraulic-mechanical booster (18, 19, 20, 21), the improvement wherein the pump part (P), the valve part (V) and the nozzle part (D) of the fuel injection apparatus (1) are disposed in a vertical arrangement, hydraulically in line with one another in terms of the fuel flow, wherein a tappet rod (6.4) of the control part (6) is actuatable via a pivotably supported booster lever (18) counter to the action of a restoring spring (19), and the pivot lever (18) is moved by a secondary piston (20).
A fuel injection apparatus for an internal combustion engine having:
- a pump part (P):
- a nozzle part (D) with an injection nozzle (14) protruding into the combustion chamber of the engine, which nozzle is in communication with a valve chamber (6.1);
- and a valve part (V) in which a control part (6) closes and opens inlet bores (5, 8) for fuel that is at high pressure, and the control part (6) is actuatable by means of a hydraulic-mechanical booster (18, 19, 20, 21), the improvement wherein the pump part (P), the valve part (V) and the nozzle part (D) of the fuel injection apparatus (1) are disposed in a vertical arrangement, hydraulically in line with one another in terms of the fuel flow, wherein a piezoelectric actuator (25) acting on a primary piston (23) is received on the hydraulic-mechanical booster (18, 19, 20 and 21), and the primary piston (23) hydraulically acts on a secondary piston (20) via a leakage gap.
A fuel injection apparatus for an internal combustion engine having:
- a pump part (P);
- a nozzle part (D) with an injection nozzle (14) protruding into the combustion chamber of the engine, which nozzle is in communication with a valve chamber (6.1);
- and a valve part (V) in which a control part (6) closes and opens inlet bores (5, 8) for fuel that is at high pressure, and the control part (6) is actuatable by means of a hydraulic-mechanical booster (18, 19, 20, 21), the improvement wherein the pump part (P), the valve part (V) and the nozzle part (D) of the fuel injection apparatus (1) are disposed in a vertical arrangement, hydraulically in line with one another in terms of the fuel flow, wherein wear of the mechanical components (6.4, 18, 20) is compensated for by a replenishing flow of leak fuel (22) between booster pistons (20, 23).
Dependencies are inferred from the claim text.