Theory and Experiment Study of Anti-backlash Single-and Double-roller Enveloping Hourglass Worm Gear

doi:10.3901/JME.2020.03.088

Abstract

Abstract: As a new precision transmission system, the anti-backlash roller enveloping hourglass worm gear has been increasingly used in robot joint design, packaging production line, and CNC (computer numerical control) machine tools. In spite of that, a general theory used to analyze the classic single and double roller transmissions principles still remain uncovered. To solve this problem, unified engagement equation, induced normal curvature, lubrication angle, autorotation angle, entrainment velocity, helix angle and contact line equation are established for the first time and numerically investigated by utilizing Matlab code. The difference between the single-roller enveloping hourglass worm and the double-roller enveloping hourglass worm in terms of their transmission principle and transmission performance are theoretically clarified. Transmission efficiency experimental tests are conducted for both two roller enveloping hourglass worms. The results of our studies show that there is no significant difference between the two roller enveloping hourglass worms regarding their transmission efficiency. The anti-backlash single-roller enveloping hourglass worm (ASEHW) gear enjoy more advantages with respect to above key technical indicators than the anti-backlash double-roller enveloping hour glass worm (ADEHW) gear. In addition, the ASEHW gear are easier to fabricate, install, and calibrate compared with its counterpart. However, when eliminating gear backlash is taken into account, the ADEHW gears are more auto-adjustable. This study will laid a theoretical foundation for promoting the application of the anti-backlash roller enveloping hourglass worm gears and improving its related performance.

Key words: roller enveloping hourglass worm gear, zero-backlash, gear engagement theory, transmission efficience

CLC Number:

TG21

DENG Xingqiao, WANG Jie, WANG Shisong, WANG Shike, HE Ge, LIU Yucheng. Theory and Experiment Study of Anti-backlash Single-and Double-roller Enveloping Hourglass Worm Gear[J]. Journal of Mechanical Engineering, 2020, 56(3): 88-95.

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