| 摘要 |
An improved engine output shaft includes a crankpin assembly for operatively connecting the shaft to each reciprocating piston for translating the reciprocating motion of each piston to rotary motion of the shaft through a leverage arm between the axis of rotation of the shaft and the point of operative connection between each piston and the shaft. The crankpin assembly is fixed to rotate with the shaft and defines a plurality of fixed crankpin offsets and transition offsets which sequentially vary the moment arm in a predetermined manner during the rotation of the shaft to produce a substantially constant total engine torque output during each increment of rotational movement. A method for making the improved engine output shaft comprises the steps of providing aforedescribed crankpin assembly, determining a target value for total torque output for each increment of engine output rotation, selecting first estimated values for each of the plurality of fixed crankpin and transition offsets, calculating the engine output torque for each rotational increment for a single cylinder, summing the torque contributions and demands for all cylinders at each increment of shaft rotation to determine the total torque output for each increment, comparing the total torque output with the target value for each increment, selecting second estimated values for each of the plurality of fixed crankpin and transition offsets based upon the observed deviation from the target torque value and repeating the calculations until the selected offsets satisfactorily reproduce the target torque value.
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