Bearing retarding mechanism works

1. Gear gear transmission is very widely used a kind of mechanical transmission, various kinds of machine tool drive almost have gear transmission. In CNC machine tool servo feeding system adopts gear with the purpose of the two. One is to high speed torque servo motor ( Such as the stepper motor, dc and ac servo motor, etc. ) Low speed high torque output to perform a input; The other is to make the ball screw and the rotational inertia of the workbench in a relatively small proportion of technical secondary school system. In addition, for the open loop system also can ensure the accuracy of the required movement. In order to minimize backlash effect on the machining accuracy of nc machine tools, often take measures in the structure, to reduce or eliminate the empty range error of gear pair. Such as double piece of gear fault gear, using eccentric sleeve center distance or using axial adjustment gear set gasket adjustment method to eliminate the gear clearance. Compared with using synchronous cog belt, used in nc machine tool feed drive chain gear speed reducer, are more likely to produce low frequency oscillation, thus retarding mechanism often configuration damper is to improve the dynamic performance. 2. Synchronous cog belt tooth synchronous belt transmission is a new type of belt transmission. He took advantage of the tooth profile and cog belt pulley of the gear tooth meshing in turn transfer movement and power, and the advantages of both belt drive, gear drive and chain drive, and no relative sliding, the average transmission more accurate, high driving accuracy, and cog belt of high strength, small thickness, light weight, it can be used for high-speed transmission. Cog belt without special tension, the effect on the shaft and bearing load is small, the transmission efficiency is high, is now widely used on nc machine tools. Main parameters of synchronous cog belt and specification is as follows: 1) Pitch pitch p as the distance between two teeth on the section line. Due to the strong layer length unchanged at work, so is a strong layer of the center line of provisions for cog belt pitch line ( Neutral layer) The perimeter of the section, and the line L as nominal length of toothed belt. 2) Modulus modulus is defined as m = p/PI, make one of the main cog belt size calculation basis. 3) Other parameters and other parameters of the tooth profile with same size with the involute gear rack. Tooth profile with the calculating formula of tooth profile and involute spline, because the cog belt pitch line on the powerful layer, not in school. Cog belt labelling method is: teeth, modulus * width * m * b * z.