Patent ID: 9079261
Filing Date: 2015-07-14
Classification: B23F,G01D,Y10T

Abstract:
1. A system, comprising: a gear assembly including a phonic wheel fixed to a primary gear and a secondary gear rotatably engaged to the primary gear; a sensor configured to output a signal upon detecting a tooth of the phonic wheel; and a digital logic circuit configured to detect the signal, to generate a primary gear tooth pulse at intervals corresponding to intervals of teeth of the primary gear based on the detected signal, and to generate a secondary gear revolution signal at an interval corresponding to a revolution of the secondary gear based on the primary gear tooth pulse; wherein the digital logic circuit includes a phonic wheel tooth time counter to count the N teeth of the phonic wheel detected by the sensor and to calculate a first time period for detecting the N teeth; wherein the N teeth is a number of total teeth located around a circumference of the phonic wheel; and wherein the digital logic circuit includes a divider configured to receive from the phonic wheel tooth time counter the first time period for detecting the N number of teeth and to divide the first time period by Y to generate a second time period, where Y corresponds to a total number of teeth located around an outer circumference of the primary gear.