TP series gear units overview: Modular design realizes variable combination. Housing is made of cast iron, which improve its rigidity and anti-vibration. Sun and planet gears are processed by cementite and hardening, gears are processed by grinding, which improve the efficiency and lifetime of gear units. Input mode: Coaxial input, helical gear input, bevel-helical gear input. Out put mode: Internal involute spline, hollow shaft with shrink disk, external involute spline, solid shaft with flat key. Mounting mode: Horizontal vertical, torque-arm. P series sizes 9-34, transmission stage: 2, 3, ratio: 25-4000. Ratio will be larger in combination with CR, K, R series.