Patent ID: 8733469

Claim:
A pulse generator for a downhole tool, comprising: a tubular section having a bore therethrough along a longitudinal axis; a first ring disposed in the bore of the tubular, forming an orifice; and a poppet disposed in the bore of the tubular, operatively movable along the longitudinal axis of the tubular section between a first position and a second position; a first shaft, connected to a rotational power source, comprising: a cam track machined on an end of the first shaft, inclined relative to the longitudinal axis; and a bearing disposed in the cam track; a second shaft, adjacent the first shaft, comprising a surface inclined relative to the longitudinal axis disposed with the cam track, the second shaft connected to the poppet, wherein a first half rotation of the first shaft urges the second shaft relative to the longitudinal axis from a first position to a second position, and wherein a second half rotation of the first shaft allows the second shaft to move from the second position to the first position, wherein the poppet in the second position partially occludes the orifice, causing a pressure spike in a drilling fluid flowing through the orifice, wherein the poppet in the first position does not occlude the orifice, and wherein the poppet does not rotate relative to the tubular section.