QJM variable ball piston motor 1.Light weight,small size 2.Wide speed regulating range 3.Reliable performance and long life. QJM variable ball piston motor1. Light weight,small size2 ... . A small kinematic pair inertia and a hard steel ball make this motor continuously work during the rotation at higher speed and ... ,0.825,0.4132031.5 2-2504881,2441,122151.2 QJM variable ball piston motor