Piezoelectric injector for fuel-injection systems of internal combustion engines
AssigneeDaimlerChrysler AG
InventorUlrich Augustin
Life of this patent
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Abstract
A piezoelectric injector for fuel-injection systems of internal combustion engines has a piezoactuator guided with spring pretensioning in a valve housing. The actuator presses a sealing piece onto its valve seat through an actuating part, with the actuating part consisting of a pressure pin passing through the piezoactuator and having a head part resting on piezoactuator. The pressure pin and piezoactuator are of the same length and are made of the same ceramic material, in operation the sealing piece is lifted off its valve seat by piezoactuator which is expanded when in the charged state.
Claims20
A piezoelectric injector for fuel-injection systems of internal combustion engines, comprising:
- a piezoactuator guided under spring pretensioning in a valve housing,
- wherein an actuating part comprises a pressure pin that passes through the piezoactuator and a head part resting on the piezoactuator, said actuating part pressing a sealing piece against a valve seat thereby closing a bore leading to a pressure chamber,
- wherein the pressure pin and the piezoactuator are of approximately the same length and are made of similar thermal expansion characteristic ceramic material or ceramic-like material, and
- wherein the sealing piece can be lifted off its valve seat by the piezoactuator which is extended when in the charged state.
Piezoelectric injector for fuel-injection systems of internal combustion engines, comprising:
- a piezoactuator guided under spring pretensioning in a valve housing, wherein the piezoactuator consists of two small actuators located side by side,
- wherein an actuating part comprises a pressure pin that extends between the actuators, with the pressure pin being coupled by a bridge that connects the two actuators, said actuating part pressing a sealing piece against a valve seat thereby closing a bore leading to a pressure chamber,
- wherein the pressure pin and the actuators are of approximately the same length and are made of similar thermal expansion characteristic ceramic material or ceramic-like material, and
- wherein the sealing piece can be lifted off its valve seat by the piezoactuator which is extended when in the charged state.
Dependencies are inferred from the claim text.