Worm gear CAN NOT selft locking

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SUMMARY

The discussion centers on the inability of a worm gear to self-lock in a 150-tonne hydraulic crawler crane system. The user explains that while worm gears can be self-locking when the lead angle is less than the friction angle, the heavy boom causes the spur gear to rotate the worm gear when the motor is removed. This indicates that the worm gear's self-locking ability may be compromised due to wear, altering the coefficient of friction between the worm and the gear. The user seeks assistance in understanding this phenomenon.

PREREQUISITES
  • Understanding of worm gear mechanics and self-locking principles
  • Knowledge of hydraulic crane systems and their components
  • Familiarity with friction coefficients and their impact on gear performance
  • Experience with mechanical wear and its effects on machinery
NEXT STEPS
  • Research the mechanics of worm gear self-locking and lead angles
  • Investigate the effects of wear on friction coefficients in gear systems
  • Explore maintenance practices for hydraulic crane systems to prevent gear failure
  • Learn about alternative gear systems that provide self-locking capabilities
USEFUL FOR

Mechanical engineers, crane operators, maintenance technicians, and anyone involved in the design or upkeep of heavy machinery utilizing worm gears.

tendem
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worm gear CAN NOT selft locking !

Good day Sir,
In the 150 tonne hydraulic crawler crane, to lifting the boom and load, they use pump to drive motor. As motor rotated, it make the worm gear rotate together. and the spur gear rotate too. So the winch rotate and the boom is lifted. I know that the worm gear can be Self Locking as the lead angle of the worm is less than the friction angle. But when I remove the motor out of system,heavy boom make the spur gear rotate, and incrediblly the worm gear rotate too. I mean the worm gear CAN NOT Self Locking. So please help me to solve this probem, I think,after long time in service. The worm gear loss ability of self locking due to wear.SO the coefficient friction between the worm and the gear be changed.Is it possible ? Thanks a lot
 
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Welcome to PF, Tandem.
You are way out of my league with this question... as in several orders of magnitude regarding scale. I have never been able to make a worm gear back up, but on the other hand I have never dealt with a load of more than 20 kg. Sorry that I can't help you.
 

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