PRELOADED SPRING FOR USE WITH A PIEZOELECTRIC FUEL INJECTOR
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United States of America Patent
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Feb 6, 2015
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Feb 7, 2014
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Abstract
A: piezoelectric fuel injector spring assembly and an assembly method for assembling such a piezoelectric fuel injector spring assembly. The assembly has a piezoelectric element (204}, a first spring {212), and a second spring (210). The first spring (212) biases the second spring (210) by expanding the second spring {210}, and the second spring {210} is further expanded when the piezoelectric element (204) expands. For the assembly, the first spring is compressed by an external compressing force prior to connecting a second end of the second spring to a second end of the piezoelectric element, and after connecting the external force is released allowing establishment of spring force equilibrium between the first and second spring.
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