There are two kinds of circulation of ball screw: outer circulation and inner circulation.Sometimes the ball in the process of the loop and the lead screw out of contact is called the outer cycle;Always in contact with the lead screw is called the inner loop.Each loop of the ball is called a column, and the number of leads contained in each loop of the ball is called the winding number.Each nut of the inner circulating ball screw pair has 2, 3, 4, 5, etc. Each nut has only one circle.Each column of the outer loop consists of 1.5, 2.5 and 3.5 cycles.
1) external circulation of ball screw.
The outer loop is when the ball returns to the screw nut through a spiral groove or intubation on the outer surface of the nut to re-enter the loop at the end of the loop
2)(2) ball screw internal circulation.
3) the advantages of the inner circulating ball screw are compact radial size and good rigidity. As the return raceway is short, the friction loss is small.Suitable for high sensitive and high precision transmission, not suitable for heavy load transmission.Its disadvantage is that the reverse machine is difficult to process