TORSION 83-2 EXTERNAL TORQUE OF A TRANSMISSION SHAFT INTERNAL TORQUE AND ITS DIAGRAM I\ External torque of a transmission shaft The relation between the transmission power, revolution and external torque of the transmission shaft where: P-power, unit: kilowatt(kW m=9.55(kNm) n rotational speed unit r/min or (rpm) where P-power. unit: horsepower(HP m=7.024(kNm) notational speed, unit: r/min or (rpm where: P-power, unit: kilowatt(kW) m=7.121(kNm) n- rotational speed unit: r/min or (rpm) 1PS=735.5Nm/s,1HP=7457Nms,1kw=1.36PS11 §3–2 EXTERNAL TORQUE OF A TRANSMISSION SHAFT INTERNAL TORQUE AND ITS DIAGRAM 1、External torque of a transmission shaft The relation between the transmission power, revolution and external torque of the transmission shaft：  9 55 (kNm) n P m .  7 024 (kNm) n P m .  7 121 (kNm) n P m . where：P - power, unit: kilowatt (kW) n – rotational speed, unit: r/min or（rpm） where：P - power, unit: horsepower (HP) n – rotational speed, unit: r/min or（rpm） where：P - power, unit: kilowatt (kW) n – rotational speed, unit: r/min or（rpm） 1PS=735.5N·m/s , 1HP=745.7N·m/s , 1kW=1.36PS