| 摘要 |
The invention relates to actuators for pump-nozzle-injection elements or injection pumps for internal combustion engines. Said actuators comprise a camshaft (NW) which is driven by the crankshaft (KW) via a traction mechanism (1) in a torque angle synchronous manner, whereby the traction mechanism (1) has a positive fit. The camshaft (NW) acts upon the injection elements and is provided with optimised cams for injection with regard to lift speed and therefore the speed at which the fuel is pumped. The aim of the invention is to provide actuators without injection timing mechanism for pump-nozzle-injection elements and injection pumps in such a way that the long-term changes of the traction mechanisms (1) and charge-dependent torsions of the camshaft (NW) hardly affect the nominal output. To this end, the cams are arranged in such a way that the torque angle or torque angle area of the cams of the highest speed at which the fuel is pumped deviate from the theoretically optimal position in front of the TDC at a deviating angle. The deviating angle closer to the TDC matches or is smaller than the error angle (dF) which results from the elongation of the traction mechanism.
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