The Research On Backlash Control Based On New Type Of Conical Involute Gear

For precision transmission system,the transmission backlash directly affects the stability,precision and sensitivity during its servo control.In the transmission systems for repeated location and real-time track,the control and adjustment of backlash is necessary for heightening the stability of the transmission system and the accuracy of location and track.Current devices for gear backlash adjustment exist many defects such as complexity,or inefficient,or unsatisfactory effects at adjusting backlash.In this paper,based on new type of conical involute gear,the backlash adjustment methods by electronic control were proposed,and the corresponding backlash adjustment strategies were formulated.The key technologies such as structure design,discussion on anti-backlash strategy and experimental anti-backlash tests based on the proposed backlash adjustment device are carried out.The topics are with important theoretical significance and application value.This paper mainly contains:(1)The characteristic and theory of the new type of conical involute gear with compound modification was introduced.The equations of tooth surface and non-backlash mesh are derived.The calculation and discussion on the limitation of the modification was carried out.The method for calculating the meshing efficiency was presented,and the influences of the gear parameters on meshing efficiency were analyzed by detailed calculating results.(2)The adjustment principle of backlash based on the proposed gear was researched,and the adjustment methods are analyzed.The detail backlash adjustment strategies were formulated.(3)The backlash adjustment device with electronic control was designed and developed based on the proposed backlash adjustment strategies.The controlling and testing systems were also designed and built according to the proposed anti-backlash methods.(4)The influences of big-period gear eccentricity error on transmission error and backlash were discussed,the variations of transmission error and backlash caused by big period eccentricity error were calculated,and the experimental tests were finished for validated the calculation.(5)The electronic control strategies which considerred the big-period gear eccentricity error were proposed by referring to the variation of transmission error and backlash caused by big-period gear eccentricity error,and the strategies were respectively based on acceleration identification and angular displacement judgement.Then,the simulations were done for verifying the strategies.(6)The experimental tests for validating the anti-backlash function under the proposed adjustment strategies were carried out,and the comparing analysis on the testing results were presented.The practicability of the anti-backlash device and the effectiveness of the anti-backlash strategies were verified by the experimental results.