公开(公告)号：EP2318687A1

公开(公告)日：2011-05-11

申请号：EP09702549.8

申请日：2009-01-09

申请人： Robert Bosch GmbH

发明人： REISS, Juergen ,  DEROMELAERE, Gaetan ,  POLSTER, Steffen ,  GRAF, Anja ,  ESCHENBACHER, Cosima ,  HEJTMANN, Georg ,  FELTEN, Frank ,  HENNECK, Stefan ,  KONSTANDIN, Alexander

IPC分类号： F02M51/02 ,  H01L41/083

CPC分类号： F02M51/0603 ,  H01L41/0833 ,  H01L41/0838

摘要： A piezoelectric actuator (2) for a fuel injection valve (1) has an actuator body (13) with a multiplicity of ceramic layers (25, 26, 27, 27', 27') and a multiplicity of electrode layers (28, 29, 30, 31, 32) arranged between the ceramic layers. Here, a cavity (50) is formed within the actuator body (13). In this way, it is possible for tensile stresses within the actuator body (13) of the piezoelectric actuator (2) to be displaced into non-critical regions, or dissipated in a controlled fashion by means of targeted crack initiation in said regions.

公开(公告)号：EP2318687B1

公开(公告)日：2012-03-14

申请号：EP09702549.8

申请日：2009-01-09

申请人： Robert Bosch GmbH

发明人： REISS, Juergen ,  DEROMELAERE, Gaetan ,  POLSTER, Steffen ,  GRAF, Anja ,  ESCHENBACHER, Cosima ,  HEJTMANN, Georg ,  FELTEN, Frank ,  HENNECK, Stefan ,  KONSTANDIN, Alexander

IPC分类号： F02M51/02 ,  H01L41/083

CPC分类号： F02M51/0603 ,  H01L41/0833 ,  H01L41/0838

摘要： A piezoelectric actuator (2) for a fuel injection valve (1) has an actuator body (13) with a multiplicity of ceramic layers (25, 26, 27, 27', 27') and a multiplicity of electrode layers (28, 29, 30, 31, 32) arranged between the ceramic layers. Here, a cavity (50) is formed within the actuator body (13). In this way, it is possible for tensile stresses within the actuator body (13) of the piezoelectric actuator (2) to be displaced into non-critical regions, or dissipated in a controlled fashion by means of targeted crack initiation in said regions.