Piezoelectric actuator
AssigneeRobert Bosch GmbH
InventorsRudolf Heinz, Bertram Sugg
Life of this patent
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Abstract
The invention relates to a piezoelectric actuator in particular for actuating control valves or injection valves in internal combustion engines in motor vehicles, having a piezoelectric actuator body, in particular in the form of a multilayer laminate of stacked layers of piezoelectric material and intervening metal or electrically conductive layers acting as electrodes, in which one of the face ends of the actuator body is fixed on a highly heat-conducting or metal actuator base, in which the piezoelectric actuator includes at least one highly heat-conductive cooling body joined highly heat-conductingly to the side faces of the actuator body and to the actuator base.
Claims19
A piezoelectric actuator for actuating control valves or injection valves in internal combustion engines in motor vehicles, having a piezoelectric actuator body (1), in the form of a multilayer laminate of layered plies of piezoelectric material and intervening electrically conductive layers acting as electrodes, said actuator body having face ends and side faces, one of which face ends is fixed on a highly heat-conducting actuator base (6),
- and at least one highly heat-conductive cooling body (5;
- 5.1, 5.2) is joined highly heat-conductively to the side faces of the actuator body (1) and to the actuator base (6).
A piezoelectric actuator, provided with an actuator body (1) having side faces and end faces, and having at least one band spring (8) arranged to prestress the two face ends of the actuator body (1), said at least one band spring being spaced apart from the actuator body (1) along the side faces thereof that are not covered by at least one cooling body (5;
- 5.1, 5.2), said at least one band spring and said actuator body define at least one interstice between the side faces of the actuator body (1) and the band spring (8), which at least one interstice is filled with heat-conductive elastomer.
Dependencies are inferred from the claim text.