Recirculating Ball steering System consists of a worm at end of steering rod and a nut which is mounted on worm with two set of balls in grooves of worm, in between nut and worm. function of ball is to reduce friction between worm and nut. nut has number of teeth on outside which mesh with teeth of worm wheel sector. drop arm is mounted on sector. which transfer motion to steering arms through linkages. when steering wheel turn, balls in worm groove rolls, causes to nut slides on worm. this linear motion of nut causes worm sector turn at an angle and actuate link rod through drop arm, resulting in desire steering of wheels. the end play of worm can be adjusted with help of adjuster nut. a screw is also provided by means of drop arm and hence wheel sector positioned along its axis. Recirculating Ball steering System used in tata and ashok layland trucks and advantages is here friction reduced due to recirculating ball. and due to less friction used for heavy duty vehicles.
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