Worm gears helical reduction

Top entering mixers are heavy duty equipment. They are usually fixed to a rigid structure or tank mounting. Either radial flow or axial flow turbines may be used. Speeds vary from 50 to 100 rpm and usually require a double set of helical gearing or a single set of worm gears to achieve these low speeds. Therefore, they are more expensive than single reduction mixers. 

The high-speed drive motor is coupled to the low-speed screw with a reducer or gearbox. Typical reduction rations are 15 1 or 20 1. Although helical gears are most common, worm gears are used on older or very small machines. 

Other types of motors that may be encountered in mixer applications are gear motors, pony motors, and brake motors. Gear motors are composed of an electric motor with an attached gear reducer. Spur, helical, or worm gears can be used in single or multiple reductions to achieve a wide range of output speeds. Motor power, output speed, and output torque are all essential design variables. 

The crown of this reduction could not be used to transfer motion to the rack because of its shape coupled with the worm, so in the same axis it was placed a helical gear teeth to transmit the movement to the rack, so the gear box is divided into two parts, facilitating the scaling ... 

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