Piezoelectric bender with increased activating force, and...

Details Piezoelectric bender with increased activating force, and... Piezoelectric bender with increased activating force, and...

2005-08-23

2005-08-23

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S328000, C310S353000, C251S129060

Reexamination Certificate

active

06933660

ABSTRACT:
A piezoelectric actuator includes at least one piezoelectric bender that is deformable between a first arcuate shape and a second arcuate shape that have different curvatures. A resistance device includes a moveable portion in contact with the piezoelectric bender throughout its deformation from the first shape to the second shape. In addition, the resistance device is operable to resist the deformation, preferably by resisting a change in the transverse dimension of the piezoelectric bender through a friction interaction. By resisting transverse dimension changes in the piezoelectric bender, the axial force produced by the actuator can be increased, and the same structure can compensate for wear that could otherwise undermine performance after many deformation cycles. The piezoelectric actuator finds particular application in fast valves, such as those associated with pressure switching in fuel injection systems.

REFERENCES:
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patent: 6376969 (2002-04-01), Forck
patent: 6415466 (2002-07-01), Laiso
patent: 6715466 (2004-04-01), Cotton et al.

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