Torque detection apparatus of power train

In combination, a transmission which includes shafts rotatable for power transmission and power transmission gears fixably mounted on said power transmission shafts for rotation therewith, and a phase difference type torque detection apparatus comprising:

• first and second phase detection gears fixedly connected to one of said power transmission shafts for rotation therewith, said first phase detection gear being fixed to one of said power transmission gears on said one power transmission shaft;
• a pipe fixedly connecting said second phase detection gear to said one power transmission shaft with a power transmission shaft portion, functioning as a torsion bar between said detection gears, left between positions where said first and second phase detection gears are respectively fixedly connected to said one power transmission shaft, said pipe transmitting to said second phase detection gear torsion of said power transmission shaft portion due to a torque acting thereon upon rotation thereby resulting in a difference between rotational phases of said first and second phase detection gears, said pipe having an end to which said second phase detection gear is fixed to be adjacent to and in parallel with said first phase detection gear;
• two pickup means respectively opposite to said first and second phase detection gears for detecting the rotation phases thereof and producing phase signals;
• and
• control means electrically connected to said pickup means for generating a phase difference signal based on the phase signals from said pickup means.