Speed changing box capable of automatically adjusting gear meshing clearance

Abstract

The invention provides a speed changing box capable of automatically adjusting a gear meshing clearance. Main parts of a sample mechanism of the speed changing box mainly comprise a first shaft, a third shaft, a middle shaft 2, a bearing 3, an eccentric bushing 1, a torsional spring 4 and a box body 5. when a gear is abraded to form a clearance, the torsional spring drives the eccentric bushing to rotate in an anticlockwise mode, the position of the middle shaft is enabled to move downwards, the shaft distance a between the middle shaft 2 and the first shaft and the shaft distance b between the middle shaft 2 and the third shaft are reduced, and therefore goals of reduction of the meshing clearance and even elimination of the meshing clearance are achieved.

Description

technical field [0001] The invention relates to the mechanical equipment manufacturing industry, especially the numerical control machine tool industry. Background technique [0002] Since the feed and transmission system of CNC machine tools require high precision, it is difficult for the general meshing method to meet the precision requirements. In the past, springs or shims were used to eliminate meshing gaps, but each has its own defects. The thin-toothed-tooth adjustment method using springs needs to rely on spring force to transmit power, so it cannot be used in occasions with heavy loads; and the thin-tooth-tooth adjustment method using shims cannot automatically eliminate the gap, and the gearbox needs to be disassembled for adjustment ,Time-consuming. Therefore, it is not ideal to apply it to the feed and transmission system of CNC lathes, especially in the case of high precision requirements, the defects are more obvious. Contents of the invention [0003] The ...

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