Actuators for pump-nozzle-injection elements or injection pumps for internal combustion engines

摘要

A drive for pump-nozzle injection elements and injection pumps of an internal combustion engine. The drive includes a crankshaft, a camshaft for actuating the injection elements, and form-locking traction member for drivingly connecting the crankshaft to the to the camshaft so that torque angles change in a synchronous manner. The camshaft has cams which are optimized in each case for an injection process with respect to stroke velocity and thus feed rate of fuel. The cams are configured so that the torque angle or a range of torque angles (alphaVHmax) before TDC of the cams at which the cams produce a maximum fuel feed rate deviates by an angle alphaa from an optimum angle before TDC (K). An amount by which the angle deviates from the optimum angle in a direction toward TDC is no more than an angular error (alphaF) resulting from an increase in length of the traction means during operation.