Gear drives and ball screws in precision drives

InPrecision transmissionIn, the gear transmission device is one of the components that cannot be ignored. The gear transmission device is a transmission mechanism composed of multiple gears. Using the principle of gear surge, the speed of the prime mover is converted to the required speed and the corresponding torque is obtained. Gear transmission device is an important basic part of mechanical equipment. Compared with belt chain, friction, hydraulic transmission, precision transmission has a series of characteristics such as large power range, high transmission efficiency, stable movement, accurate transmission ratio, long service life, compact structure, etc. Its safety, reliability and superior cost performance characteristics determine its irreplaceability in the field of general machinery and equipment. With the rapid development of China's national economy, in gear related industries, the rapid increase in market size, we have actually become a veritable manufacturing gear country.

Within the scope of global precision transmission research, countries have carried out research on gear research. The field of precision transmission product design is very wide, including but not limited to wind power industry, automobile industry, aviation industry and so on. The Gear Research and Technology Center of NSKE University in the United Kingdom, as early as 1970, 24 engineers and technicians carried out related research technologies for gear design and manufacturing and its surface engineering. The main research features are the contact characteristics, failure mechanism and surface modification of gears. In the development after precision transmission, 45 engineers and their technicians led by the Gear Research Center of the Technical University of Munich in Germany in February focused on the design and analysis of the system, the research and experimental technology of tribology, and the reliability and success of gears.

In our current living environment, precision transmission systems are widely used in many fields, such as IT, OA products, household appliances, automobiles, etc. In the field of precision transmission, ball screw is an indispensable key mechanical component. Precision transmission is a transmission element commonly used in tool machinery and precision machinery. The main function of precision transmission is to convert rotary motion into linear motion.

The ball screw is composed of screw, nut, steel ball, pre-pressing sheet, reverser and dust proof. The function of precision transmission is to convert rotary motion into linear motion, and to change the bearing from sliding action to rolling action.

In 1898, people tried to add steel balls between the nut and the screw, converting the sliding contact of the traditional screw into rolling contact; replacing the sliding friction with rolling friction, converting the rotary motion of the steel ball in the nut into linear motion, and converting the torque into axial repeated force,Precision transmissionIn order to improve the traditional screw positioning is not good and easy to damage the situation. When the ball screw is used as the active body, the nut will be converted into linear motion according to the lead of the corresponding specification with the rotation angle of the screw. The passive workpiece can be connected with the nut through the nut seat to realize the corresponding linear motion.

Cut three samples with a length of 250 mm from one PJ V-ribbed belt, and mark a marking line with a spacing of 100mm at the middle position of the PJ V-ribbed belt. When more than three samples cannot be taken from one PJ V-ribbed belt, samples can be cut from the same batch of PJ V-ribbed belt, but must be indicated in the report. 7.4.2 High temperature resistance test method
Place the sample at 100 ℃ ± 2 ℃ for 96 h ± 1 h and then take it out. After standing at laboratory temperature for more than 2h, bend it along a cylinder with a diameter of 20 mm at a contact angle of at least 90 °.