Patent ID: 6452308
Filing Date: 2002-09-17
Classification: F02M,H01L

Abstract:
A piezoelectric actuator for actuating control valves or injection valves in internal combustion engines in motor vehicles,having a piezoelectric actuator body (1), comprised of a multilayer laminate of layered plies of piezoelectric material including means for applying an electric field to said plies of piezoelectric material, and conductive common electrode leads (3), which connect to the means for supplying an electric field, wherein the actuator body (1) is surrounded by a metal module wall (2), an interstice (5) is provided between said module wall and said common electrode leads, the common electrode leads (3) are configured to increase heat transfer thereof and a portion of said common electrode leads contact the actuator body (1) and is provided as means for increasing a surface area thereof protruding into the interstice (5), for dissipating heat from the actuator body (1), and the interstice (5) is filled with elastomer (7, 17, 27), which contains heat-conducting means, and in which said means for increasing a surface area of said leads comprises a lengthened portion (31, 32) of said leads.