Ball Screw

★　What is Ball Screw?

When moving the object, generally speaking, the momentum generated by force need to be transmitted directly or indirectly from other organizations to the final object. Take automobile as the example, due to the petrol combustion inside engine, piston shifts up and down, the momentum is transmitted to wheels through middle organization and make wheels rotated finally. Nowadays, the momentum conduction organization is the representative settings in machinery industry. ZWZ ball screw is the ideal product which can transform the rotary movement into linear movement or the linear movement into rotary movement.

●　THK Ball Screw Characteristics

1、Drive moment is 1/3 of sliding screw
The ball screws hold high rotation speed for there are many balls rotate between thread root and nut.
2、Guarantee of high precision
Ball screws in ZWZ are manufactured with world wide top machine and equipment imported from Japan. Grinding, assembly, factory environments, temperature and humidity are controlled strictly. Consummated quality management system ensures precision.
3、Micro Feeding
Drive moment for ball screws is very small for it performs by balls’ movement without gliding, which enables precise micro feeding.
4、No side clearance and high rigidity
Pre-pressure can be added onto ball screw. Pre-pressure enables axial clearance to be negative to ensure high rigidity (By adding pressure onto balls inside ball screw, force among balls enhances rigidity of nut when applied on machinery).
5、High Speed Feeding
Ball screws can feed with high speed due to its high movement efficiency and less small heat generated.

Principal Products

▲Adding phase difference onto left side and right side of thread on central of single nut to reduce axial clearance below zero (negative pressure). Its bulk is small but it can move steadily.	▲This screw combines two nuts to reduce side clearance by adding pressure onto gasket. It is assembled by thread through flange.
▲A simple type with only a nut. It is assembled by the bolt runs through flange.