The NMRV gearbox consists of a housing, worm gear, worm wheel, and output shaft. The housing is made of high-strength cast iron or aluminum alloy and is designed to protect the internal components from external elements. The worm gear is a cylindrical shaft with a helical thread that meshes with the worm wheel. The worm wheel is a circular gear with teeth cut into the outer circumference, and it is mounted on a shaft that is perpendicular to the worm gear. The output shaft is connected to the worm wheel and rotates with it, providing the output speed and torque.