| 摘要 |
A pump-nozzle unit for feeding fuel into a combustion chamber of an internal combustion engine, having a controllable fuel pump, which comprises a control valve with a valve needle which is deflected by a piezo actuator, the comparatively small travel of the piezo actuator being increased by a mechanical step-up converter to the extent required for deflection of the valve needle. In order not to endanger the ability of the control valve housing to withstand pressure yet nevertheless to provide relatively wear-resistant bearing regions ( 80, 82 ) which come into contact with the mechanical step-up converter ( 56, 58 ), it is provided that the control valve housing is formed from a material with a relatively low basic hardness, for example from Ovako 677, and that the bearing regions ( 80, 82 ) of the control valve ( 22 ) are hardened further by laser means.
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