Measurement of shaft speed, angular displacement, position or movement

摘要

The disclosure relates to improvements in the measurement of shaft speed. The shaft has an end face and at least one detection mark provided on or in the end face of the shaft to enable the speed, angular displacement, position or movement of the shaft to be detected. The shaft is for use in a shaft assembly comprising a sensor positioned at a distance from the shaft end face. The sensor is configured to measure the speed, angular displacement, position or movement of the shaft by sensing movement of the detection marks.

主权项

1. A shaft assembly comprising:
a casing; a shaft mounted for rotation about an axis in the casing and supported at one end by a bearing; a gear mounted at the one end of the shaft; an end face of the shaft including a plurality of detection marks machined into the end face and evenly spaced in a ring shaped pattern around the axis; a sensor attached to the casing and located in a plane axially displaced by an air gap from the end face away from the shaft, and being oriented to detect rotation of the detection marks around the axis; and the sensor being operable to generate a signal proportional to a rotational speed of the shaft.