A ball screw with adjustable preload structure

Abstract

The invention belongs to the technical field of application of numerical control machine tools and particularly discloses a ball screw with an adjustable pretension force structure. The ball screw with the adjustable pretension force structure comprises a ball screw, a first screw nut and a second screw nut arranged on the ball screw, a connection flange arranged on the ball screw and connected with one side of the second screw nut, and a pretension force regulating component between the first screw nut and the second screw nut. The ball screw with the adjustable pretension force structure has the beneficial effects: the pre-tightening requirement between the first screw nut and the second screw nut is adjusted by a manner of adjusting an adjusting ring, a limit ring, a positioning protrusion, a threaded rotary sleeve, a first adjusting ring and a second adjusting ring, the pretension force between the first screw nut and the second screw nut is uniformly distributed, the adjustment steps are safe and reliable, and the rotary adjustment accuracy is achieved by aligning grooves during the adjustment. The ball screw with the adjustable pretension force structure is reasonable in design and stable in working state.

Description

technical field [0001] The invention belongs to the technical field of digital machine tool applications, and in particular relates to a ball screw with an adjustable pretightening force structure, which can effectively improve the working stability and positioning accuracy of the ball screw. Background technique [0002] Ball screw is an ideal product for converting rotary motion into linear motion, or converting linear motion into rotary motion. It is the most commonly used transmission element in tool machinery and precision machinery. The ball screw is composed of screw, nut, steel ball, preloader, reverser, and dustproof device. Its function is to convert rotary motion into linear motion, or convert torque into axial repeated force. Characterized by high precision, reversibility and high efficiency, with very little frictional resistance, ball screws are widely used in various industrial equipment and precision instruments. [0003] In actual use, due to design, manufa...

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Problems solved by technology

[0003] In actual use, due to design, manufacturing and assembly errors, there will always be a gap between the ball and the raceway in the ball screw, and in order to solve the above problems, the method of applying pretightening force is usually used to eliminate this gap. Only by adjusting a reasonable preload can the working stability and positioning accuracy of the ball screw be effectively improved, because excessive preload will reduce efficiency, increase wear and cause frictional heat

However, in the actual operation of the ball screw, the friction and wear between the ball and the raceway is unavoidable, especially after a long time of operation, the increasing amount of wear will lead to a more serious loss of preload of the ball screw, The existence of preload loss will seriously affect the dynamic performance and reliability of the ball screw, and accelerate the damage of the ball screw

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