Injector for controlling fluids
AssigneeRobert Bosch GmbH
InventorFriedrich Boecking
Life of this patent
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Abstract
An injector for controlling fluids has a piezoelectric actuator and a hydraulic pressure intensifier. The hydraulic pressure intensifier is composed of a first piston, a second piston and a pressure chamber filled with fluid and situated between the two pistons. In addition, a control valve and a priming device are provided to replace the fluid loss in the pressure chamber caused by leakage. The priming device has a priming chamber filled with fluid, and leakage losses in the pressure chamber are replaced by fluid from the priming chamber during a return movement of the hydraulic pressure intensifier as a result of a displacement effect in the priming chamber created directly or indirectly by the first piston.
Claims10
An injector for controlling fluids comprising:
- a piezoelectric actuator;
- a hydraulic pressure intensifier including a first piston, a second piston and a pressure chamber, the pressure chamber being filled with fluid and being situated between the first and second pistons;
- a control valve;
- and
- a priming device for replacing a fluid loss in the pressure chamber caused by leakage, the priming device having a priming chamber filled with fluid, with leakage losses in the pressure chamber being replaced by fluid from the priming chamber during a return movement of the hydraulic pressure intensifier as a result of a displacement effect in the priming chamber created, directly or indirectly, by the first piston.
Dependencies are inferred from the claim text.