Counter/Rack/Back Roller For Building Hoist

The Counter Roller for construction hoist , we have our own equipment, can meet the different needs of product manufacturing.provide all the products for you from Zoomlion,GJJ and Baoda.We can supply many kinds of spare parts for chinese construction hoist, high quality will be strictly guaranteed and fast delivery can be made if order placed.
Since the rack tooth profile is a straight line , so that each point on the tooth profile with the same pressure angle , and equal to the inclination angle of the tooth profile , this angle is called pressure angle , standard value is 20 °. either with an addendum line parallel with the same pitch on a straight line and modulus .parallel to the top line and the tooth thickness of the tooth space width of the straight line is called equal dividing line ( neutral) , it is calculated the size of the rack baseline .