PTO right angle gearbox?

crackcrack30

Looking for a pto "right angle gearbox" for a diy attachment project..... something that when attached would drive a sprocket forward or anticlockwise i guess....tractor pto turns clockwise when looking from rear and then exit shaft from (angled gearbox) box turns anticlockwise...

was thinking of possibly a Topper gearbox turned on its side where can these be gotten? do they turn this way? would it make a difference that its on its side.......it will be used to drive a chain and sprocket conveyor......

cheers.

td5man

The gearbox of a doublechop harvester would do what you want

pakalasa

Modern Plant, near The Red Cow hotel in dublin stock gearboxes.
http://www.modernplant.ie/?Offer=29

Comer are a well known gearbox used in farm machinery. Don't know if there are Irish agents for them.
http://www.comerindustries.com/en/products/agricultural.html

Remember the full power of the tractor will be going through this. So a clutch and maybe a slip clutch might be needed.

Milton09

I think standard gearboxes off toppers,harvesters etc. might not suit your application. If you are driving a sprocket for a chain then the speed would be too high, you would need reduction built in as chain drives cant travel fast.

td5man

Milton09 wrote: »

I think standard gearboxes off toppers,harvesters etc. might not suit your application. If you are driving a sprocket for a chain then the speed would be too high, you would need reduction built in as chain drives cant travel fast.

Big sprocket driving a small one might give enough reduction.

crackcrack30

Will the output shaft from a topper gearbox travel in the desired direction i.e anti-clockwise?.....

& would a large v shape belt (drive) be a better option down to a sprocket and chain conveyor due to the speeds being initally delt with?

tanx for all replys....

bbam

Saw a bodge job done years ago with an escort back axle for a 90 degree pto to a milking machine.
Rough but it did work.

pakalasa

Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488

Just bear in mind that when you gear down the speed, the torque will go up, and vice versa. So if something gets caught up on the shaft, it can do serious damage.

crackcrack30

What ratio's and exit rotations is the norm for topper and double chop gearboxes? & how would u rate the performance of v drive belt town to the conveyor shaft to allow for the initial speed reduction??

there should be no more or less pressure on the conveyor than on the wheel drive of a ride-on lawnmower

blue5000

Hi crack crack, I was Hennesys scrap yard, near Templemore on friday, saw a votex topper in there with a gearbox on it. I think the output goes faster than the input, something like 2 and a half turns for the topper for every one turn of the pto.

The oil level is critical, it sounds like you want to run it horizontally, not down like for example the way an agitator gearbox runs?

delaval

Is there any way you would consider an electric solution. I have an old scraper motor complete with gearbox. Travels slowly though

cjpm

Double chop would be your best bet if mounting horizontally. There are different speed boxes depending on the machine, like for one brand of machine there would be 540 and 1000 speed boxes that would have the same flywheel speed (output speed). I think a 615rpm or something similar was also available for the new Hollands.

One thing though, a lot of them are 105 degree boxes and not a right angle due to the angle of the drawbar to the flywheel.

pakalasa

crackcrack30 wrote: »

.....there should be no more or less pressure on the conveyor than on the wheel drive of a ride-on lawnmower

Even if there is very low pressure on the conveyor, if something gets caught in the conveyor , the full horsepower of the tractor will transmit down the drive. It will break then at the weakest link, whatever that is.
A conveyor needs to be able to stall safely. Just be careful !!!

crackcrack30

ya deffo guards ect will all be put on to provide a safe machine, if a pulley belt worked down to the conveyor i would think it safer (if it breaks) and quiter....i'll also try to incorporate shear pins at some point on the conveyor.....

Would a double chop gearbox be easily mounted/bolted to a frame? are they a 6 spline on input and output? Still in tha design stages as you can see........thanks.

blue5000

crackcrack30 wrote: »

ya deffo guards ect will all be put on to provide a safe machine, if a pulley belt worked down to the conveyor i would think it safer (if it breaks) and quiter....i'll also try to incorporate shear pins at some point on the conveyor.....

Would a double chop gearbox be easily mounted/bolted to a frame? are they a 6 spline on input and output? Still in tha design stages as you can see........thanks.

I think you will have to gear it down an awful lot from 540 rpm to run a conveyer belt. Maybe a forage harvester gearbox run the opposite way, if you put the tractor on the double chop side of the gearbox you would slow it down from 540 rpm to about 300. With belts it is easier to change speeds with small pulleys to drive a big one to slow it down.

There is engineering formula's to be got, A book called machinery's hand book would be a big help to you, the link is for amazon new one, but second hand can be got on ebay

http://www.amazon.co.uk/s/?ie=UTF8&keywords=machinery%27s+handbook&tag=googiehydra-21&index=stripbooks&hvadid=4908008223&hvpos=1t1&hvexid=&hvnetw=g&hvrand=19115753161314005231&hvpone=&hvptwo=&hvqmt=e&ref=pd_sl_9dlpx58utj_e

jmrc

just a thought creckcrack, why not do it hydraulically? safer and no probs with the angle problem.... seeing as you have the tractor there already.... just thinking....

Damo810

He won't have the tractor at 1900 RPM though, so the PTO won't rotate at 540RPM. What kind of power would be needed to run this machine? If it's only small, why bother using your tractor at all? Why not get a small motorbike engine or just about any engine with a side output?

blue5000

blue5000 wrote: »

I think you will have to gear it down an awful lot from 540 rpm to run a conveyer belt. Maybe a forage harvester gearbox run the opposite way, if you put the tractor on the double chop side of the gearbox you would slow it down from 540 rpm to about 300. With belts it is easier to change speeds with small pulleys to drive a big one to slow it down.

There is engineering formula's to be got, A book called machinery's hand book would be a big help to you, the link is for amazon new one, but second hand can be got on ebay

http://www.amazon.co.uk/s/?ie=UTF8&keywords=machinery%27s+handbook&tag=googiehydra-21&index=stripbooks&hvadid=4908008223&hvpos=1t1&hvexid=&hvnetw=g&hvrand=19115753161314005231&hvpone=&hvptwo=&hvqmt=e&ref=pd_sl_9dlpx58utj_e[/QUOTE]

Ya ok what I meant was IF the tractor side was doing 540 the harvester side is usually geared up to about 1100 rpm, but by turning it around the out put would be about 300rpm IF the tractor is doing 540, ok?

crackcrack30

jmrc wrote: »

just a thought creckcrack, why not do it hydraulically? safer and no probs with the angle problem.... seeing as you have the tractor there already.... just thinking....

Going to explore the idea of a hydraulic motor to drive my conveyor, belt or chain a bit more........... i know that the tractor had a log splitter on it before so it should do, I take it that the torque ability is in the size of the motor and the speed is operated from the tractor lever controls?
, I never tackled anything with hydraulic motors before......

cheers for any heads up/direction.

pakalasa

A hydraulic motor is a lot better way. You can reverse direction with a valve and use a pressure relieving valve for safety.
You need to work out the following first;
- The linear speed of the conveyor. How fast do you want it go to? (Meters per second)
- Measure the diameter of the drive drum of the conveyor. (e.g 100mm)
- The top 2 will give you the RPM of the hydraulic motor.

- Find out the flow rate of the tractor hydraulic pump.
- Also max pressure from the tractor. The pump needs to be able to handle this.

From hydraulic motor RPM and tractor hydraulic flow, this will give you the cc/rev of the motor. that's all you need.

Astroman1968

Converting a harvester to tow behind a quad for cutting rushes.have everything stripped off that don't need.
Would a motorbike engine run this direct as no gearbox came with it.
Any advice would be deadly.

Mod note;
Posts moved to new thread http://www.boards.ie/vbulletin/showthread.php?t=2057659363