Method for producing a tubular spring and an actuator unit...

Details Method for producing a tubular spring and an actuator unit... Method for producing a tubular spring and an actuator unit...

2007-05-29

2007-05-29

Jimenez, Marc (Department: 3726)

Metal working

Method of mechanical manufacture

Multiperforated metal article making

C029S896900, C029S890120

Reexamination Certificate

active

10821775

ABSTRACT:
A method for producing a tubular spring (12) in the form of a cylindrical hollow body, especially for pre-tensioning a piezoelectric actuator element (2) of an actuator unit (1) of a fuel injector comprises the step of providing a thin-walled, solid-drawn steel tube with a plurality of regularly arranged longish recesses (14) by means of laser cutting. Thus, an actuator unit (1) comprises a piezoelectric actuator element (2) which is arranged in a thin-walled cylindrical hollow body, wherein the hollow body being elastically embodied and pre-tensioning the actuator element (2). Furthermore, the hollow body is a solid-drawn steel tube which is provided with a plurality of longish recesses (14).

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EP 514825 Derwent Abstract.
WO 20003/08353 Derwent Abstract.

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