Not bike related but gearbox related

[The Artist]

I am looking for a gearbox that can be supplied on it's own.

https://www.saving-old-seagulls.co.uk/images/sophie%2000005.jpg

If you open that pic in a new tab and zoom in the bottom section, I need that crown and pinion section. Ideally I need a large amount of them, new and able to supply more.

The only ones I can find that are suitable are similar applications to that, as in outboard motors and they cost a fortune for the parts to make one.

Making casts and stuff like that gets very pricey very quickly so not an option at this stage.

I can find reduction gearboxes quite easily but water proof with 3-4:1 reduction at 90 degrees is hard. The ones I have found are just boxes which are not streamlined like I am looking for.

I will give a billion karma to who ever finds what I need and some to anyone that helps.

[Ichy]

What's it for? How much power/torque does it have to take? Simple things like food mixers and right angle drills or screwdrivers use smaller versions.
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[UnknownStuntm...]

I too have searched for a similar product in the past. You're after a Bevel gearbox. They are available, but they are not cheap and are frikkin' ugly.

You will need to be specific with your requirements though.

What reduction do you want?
What RPM are you putting through it?
Torque are you putting through it?

These people will probably have one:
https://www.renold.com/Products/Gears/Gears.asp
https://www.kelstongears.co.uk/bevel-gearboxes-range.asp
https://www.schaeffler.co.uk/content.schaeffler.co.uk/en/branches/industry/power_transmission/applications_5/bevel_gearbox/bevel_gearbox.jsp
But get your wallet out. In the end I used a CX500 driveshaft, which could deal with about 70hp and I adapted the input to make a realistic output.

What'cha makin...?

[Ichy]

If you want HD then you need something like a Mijon gearbox. I think it may be a mmr or mrr (can't remember). Not cheap.
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[The Artist]

1.2k RPM, perhaps a bit more.
I imagine torque to never exceed 25nm
Reduction, 3-4:1

It needs to be submersible or made to be submersible in salt water. Whilst cost is an issue, at this stage, I don't mind shelling out to build a prototype.

It is quite small but not small enough to make out of a blender.

[Drake]

Landrover dif?
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[The Artist]

[Walloper]

[N cee thirty]

diff off a ride on lawn mower
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[The Artist]

[Walloper]

[The Artist]

Problem is all the big outboard manufacturers make their own gearboxes. They make everything themselves apart from little plastic clips and stuff like that because it has to be for a marine environment.

Will have to do more research. There is a company with patents and designs for what I want that kinda went half bust a while ago so may approach them in the future.

[Walloper]

[The Artist]

[stevo as b4]

How critical is the 4:1 gear ratio? If you need a specific set reduction ratio in a gearbox that can be brought in bulk then your going to struggle a bit.

I would look away from Outboard motor's as although they have the requirements of being water proof and streamlined, they will be hard to find and buy in bulk, as also all modern outboard engines unlike the one you posted the pic of, have the reduction box built into a die-cast alloy lower leg/housing that bolts to the engine, so most of the casting is of no use to you.

I would definitely look into the industrial equipment sector for suitable gearbox's that could be adapted to be water proofed and streamlined in a new or modified casing. Have a think of any industrial equipment that has a 90deg drive reduction gearbox.

I'm sure that some powerful breaker drill's grinding machines, and mixers have 90deg drive's built into them, but it's finding your 4:1 reduction ratio that will be the hard bit.

lastly you said a food mixer was not strong enough, but how about heavy duty professional catering equipment. Things that are used in bakeries and cake manufacturer's etc might have the power transmission capabilities that you require?

[The Artist]

[Ichy]

People like Huco and Neugart make right angle gearboxes in various ratios. They are not going to be cheap new but maybe you could search ebay or similar for used?


Just found this, might be useful for some names.

https://www.directindustry.com/industrial-manufacturer/right-angle-gear-reducer-72878.html

I think you are on to a loser for finding anything that is cheap with a 4:1 ratio and waterproof.

And this, maybe phone around?

https://1stdirectory.co.uk/comp-product/gearboxes-or-gear-units-right-angle.htm
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[jimspeed]

How about the kind of drive you get on the end of a strimmer? I think they would be quite low geared as the engine is doing like 6K rpm but the strimmer head isn't going that quick..
or doing the 4>1 bit at the motor end and using a big cable to spin whatever it is you need spinning (like a speedo cable on a bike but bigger).

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[stevo as b4]

I'm thinking angle grinder/disc cutter or other similar industrial tool with a heavy duty 90deg drive. I think 9" angle grinders have a 600-800w Motor at least, and the disc does not run that quickly.

Is there a non waterproof purpose made 4:1 reduction box that you could build into a new leg casting with an external oil/water seal.

So your building a variation on an Outboard motor of some sort?

I was going to suggest looking at those modern electric outboards, but they are all low power output motors probably less than 3bhp and some of them have the motor underwater inside the actual gear casing.

[The Artist]

I have been looking all over the net and can only seem to find industrial type big square gearboxes. Nothing small and what I need.

Yes this is for a variation on an outboard motor but the main difference in this part of the project is the gear ratio. 4:1 is hard to come by. The lower reduction boxes on outboards are designed for high speed low torque which is the opposite of what I want.

I can get used ones easily, it is just if I wanted more than a few random odd ones, then it is looking like they would need to be custom made which is expensive.

[DrDonnyBrago]

[Ichy]

[The Artist]

[bikenut]

lovely cut away of the british seagull...........you experimenting with water power electric??

[Walloper]