Please help diagnose screech sound from small geared hub motor and recommend best grease.

[marka-ee]

I built a small folding bike with a geared sensor-less 250 watt hub motor. I have yet to disassemble the hub motor because it's a little tricky but I'm experiencing an intermittent 'screech' type sound for lack of better words. Definitely not a grinding sound. Could it possibly be the one-way bearing engaging somehow in reverse trying to lock up the forward motion? I'm just guessing here. When I take it apart, what should I be looking for? Again, it's not a gear type sound that would be accompanied with a defective planetary gear system. The other thing I was wondering is what's the ultimate grease type to put into one of these. I have at my disposal graphite type grease, regular grease, microfine molybdenum powder and microfine Teflon powder. So I could make a interesting grease cocktail if I wanted to. Any recommendations are appreciated. Thank you. The little 250 watt unit is not a Bafang. It's some other strange brand that appeared on folding bikes sometimes like Bromptons.

 

[Diggs]

A "screech" isn't much to go on. Video with sound may be helpful but regardless, if it's coming from the hub motor the only way to fix it is open it up and find the problem. Not much can be done looking at it externally.

 

[marka-ee]

I was hoping somebody might recognize that unique type of sound which isn't gears grinding. What are failure modes of the one-way clutch bearing? Should I mix molly powder into my grease when I grease the gears,etc?

 

[marka-ee]

It turns out this hub motor has rollers instead of planetary gears, which is extremely strange. I assume the screech was the roller slipping against the outside ring.

 

[Papa]

Bad juju to start new threads on same problem.

Without images or exterior markings on the hub's housing, it's virtually impossible help.

 

[marka-ee]

the 250 watt hub motor is a Outrider EN15194 , often used on folding bikes. Here's a picture of the internals and you can see that it uses rollers instead of gears for the planets. The cover carrier plate for the assembly is removed in this picture. You can see the needle bearings that the planet rollers are supported by in the center of each roller. You can also see that the roller definitely has no teeth. Also interesting is the so-called sun gear, which in this case seems to be a very small diameter shaft. In particular, I'm interested in what the recommended lubrication would be for this unit, since I feel that if I have too advanced of a lubrication, it might slip unnecessarily because it has no teeth, obviously.

 

[lnanek]

Reminds me of the roller brake on my Shimano Nexus IGH, which despite being a brake, does indeed have an injection port for a special Shimano Roller Brake Grease:

Shimano Roller Brake Grease (Nexus) (Tube) (100g)

Specifically formulated for servicing Shimano Nexus roller brakes. Features: Keeps roller brake components working to maximum efficiency for better... Y04120400

www.performancebike.com

 

[lnanek]

Seems to have been solved previously anyway:

Do anyone know what motor this is?

This motor has a inscription on its side, which says: "Tgx 250w 120swx 24v 175rpm 1hvt1107 en15194 mfaz 0414" Do anyone know what motor this is? Or what the more shady abbrevs stands for? Any clues would be grrrrait!

endless-sphere.com

 

[marka-ee]

I wonder what the secret sauce is in the special Shimano Roller brake grease, which I don't have on hand, and I want to reassemble it for a trip in a day or two. I also have on hand some green bike grease 'with teflon surface protector' but I have a strong aversion to any marketing slogans.

 

[stan.distortion]

Be very careful when it comes to lubrication on that type of drive, many oils contain additives that create a coating on parts and tolerances on that kind of drive will be absolutely critical, any buildup whatsoever will likely result in a big drop in efficiency and something like teflon would probably cause both drag and slippage (car engine oil used in motorcycles often causes clutch slippage due to additives for example).

My 2nd choice would be ATF, anything heavy is out imo because the rollers need to push the oil clear to have driving friction and ATF doesn't have any coating type additives, it's intended for automatic gearboxes that often depend on metal to metal friction.
My 1st choice would be to bin it and get something else, there's only one example I can think of where friction drives give long and effective service and that's Solex cycle motors (and that's only because tires are replaceable).