Actuator unit for a piezo-controlled fuel injection valve
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Abstract
An actuator unit suitable for actuating a fuel injection valve of an injection system for internal combustion engines is comprised of a piezoelectric actuator and a hollow body embodied in the form of a spring. Embodying the hollow body according to the present invention can extend the service life of the actuator unit.
25 Citations
56 Claims
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1-28. -28. (canceled)
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29. An actuator unit having an elongated hollow body (4) which is elastically embodied and which prestresses a piezoelectric actuator (1),
the hollow body (4) having a plurality of recesses and having a joint (31) extending parallel to its longitudinal axis (35), a bridge piece (19) between each pair of adjacent recesses (7, 7a, 7b), the hollow body (4) having a first end (17) and a second end (15), and the recesses (7a, 7b) adjacent to the joint (31) being smaller than the rest of the recesses (7).
- 30. An actuator unit comprising an elongated a hollow body (4) having a longitudinal axis (35) and a piezoelectric actuator (1), the hollow body (4) being elastically embodied and prestressing the actuator (1), the hollow body (4) having a plurality of recesses distributed thereover with bridge pieces between adjacent recesses, and having a joint (31) extending parallel to its longitudinal axis (35) with a bridge piece (19) between each pair of adjacent recesses (7, 7a, 7b), the bridge piece (19.1) between a recess (7a, 7b) adjacent to the joint (31) and another recess (7) adjacent to that recess being wider than the bridge pieces (19.2) between the rest of the recesses (7).
Specification