Worm gear CAN NOT selft locking

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Worm gears are typically considered self-locking when the lead angle is less than the friction angle, but in the case of a 150-tonne hydraulic crawler crane, the worm gear fails to self-lock when the motor is removed. The heavy boom causes the spur gear to rotate, which in turn rotates the worm gear, indicating a loss of self-locking capability. This issue may arise from wear over time, altering the coefficient of friction between the worm and the gear. The discussion highlights the importance of maintaining worm gear systems to ensure they function as intended. Understanding these dynamics is crucial for effective crane operation and safety.
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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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