rack and pinion

Product Description Construction hoistelevatorlift gear rack Rack and pinion drive test uses a dual- drive host , making carrying capacity increased. Driver installed in the support frame , the rail is equipped with a rack , by rolling on the rack gear , so that the lift up or down . The rack is also divided straight teeth and helical gear rack rack, respectively paired with spur gears and helical gears;tooth profile rack is linear than involute(on tooth surface is flat)