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Worm and Worm Gear Question

I imarukeeMember
Small worm and worm gear at 30:1 reduction in housing containing 3.4 ounces of oil is wearing out worm gear very quickly. Worm rotates between 500 and 1500 rpm 24/7. Went from a Texaco 80W-90 EP oil to Mobil 634 to reduce wear, possibly phosphate comtamination with bronze. The kicker here is the transmission rotates around the machine axis at 100+ rpm and is forcing the oil against the back of the transmission housing. Concern about worm gears ability to move oil to the worm keeping the fluid film lubrication throughout the engagement. Any thoughts?
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J johnmMember
quote:
Originally posted by imarukee:
Small worm and worm gear at 30:1 reduction in housing containing 3.4 ounces of oil is wearing out worm gear very quickly. Worm rotates between 500 and 1500 rpm 24/7. Went from a Texaco 80W-90 EP oil to Mobil 634 to reduce wear, possibly phosphate comtamination with bronze. The kicker here is the transmission rotates around the machine axis at 100+ rpm and is forcing the oil against the back of the transmission housing. Concern about worm gears ability to move oil to the worm keeping the fluid film lubrication throughout the engagement. Any thoughts?


If you built gearbox yourself than you can modified it also. Have you thought of adding some type of guard (e.g. a bow shaped plate) on the back of the transmission housing that would "channel" the oil that swirls on the back of the transmission housing and splash it over gears? I don’t think you will be much better off with using different type of oil as you would be with this “modification”, providing you have room for this type of baffle.
A alejandroruizMember
Imarukee,

I had a similar case in Pulp&Paper facility. We used a Mobilgear oil ISO 460. At some point when the load was high we had overheating oil thining an several problems. We tried several oils (including Mobilsynth). Results were better with synthetics, but the Mobilith SHC 007 solved the problem. The only issue we had is how to check the lubricant level, so we had to put a rod (like the ones for cheking engine oil) in the gearbox being careful to have it as far as possible from the gear.

Saludos
D dogMember
Shell, Chevron, and other oil suppliers make worm specific lubricants with an "oilyness" additive, usually animal fat.

The additive is hard to wipe off which prevents "dry" spots from developing in the areas of sliding contact present in worm screws.

You just need to find a supplier that can point you to one of them.
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