SensibleNick
Gold Member
This is brilliant.
I'm grinning from ear to ear at the moment. One thing after another pops up that I've already been looking at or am currently considering.
That twin HST pump you mention/show ... I'm seriously considering adding a couple of those to my shipment from surpluscenter so I can make a pair of small bulldozers for kids later on in life. Using 7cu wheel motors will give nice, slow, safe walking speeds, and HUGE torque
However.. Driving cylinders with them is possibly a bad idea for the reason you mention, and you'll only be able to drive 2 cylinders with one pump... unless you invest in valves... and even then I'm not sure the "semi-closed circuit" HST pumps would be happy. The Gurus on here will know. I'm a hydraulic newbie too and my opinion should be treated with caution
I'm only unsure about the hydraulic PTO motor and how to drive /control that.
I'm thinking that a simple bank of six 8gpm spool valves will do the job just fine for me, and a 5 or 8gpm belt-driven pump.
I'm resigned to the fact that this project won't come cheap...
The HST pumps might share the same chain (as yet undecided - I prefer separate chains really), whereas the PTO pump will have one to itself. A different gearing between the two may be needed at some point
My neighbour sells motorbikes in one of the biggest dealerships in Sweden... and obviously has access to vast amounts of different sprockets and chains - I'll get a good price
The smallest of all the pumps will probably end up being V-belt-drive from somewhere - I don't see that one as a problem.
When it comes to coupling and alignment, I have a pair of R+W EK2 elastomer couplings (300 series) on my desk. They're overkill but perfect for the job.
R+W | ELASTOMER COUPLINGS | EK2
The secret to a problem-free alignment is to use TWO coupings to mimic a driveshaft or PTO shaft with a coupling at each end. R+W actually produce a unit specifically for that. R+W | ELASTOMER COUPLINGS | EZ2
And it's this what I'll be mimicing with my couplings. you can even mount your engine on rubber bushings if you fancy, and separate the vibration from the rest of the chassis.
The TUD5 engine was used in the Citroen AX, the Peugeot 106 and the Citroen Saxo. They're REALLY common over on continental Europe and the UK. I'll nip over and get one when the time comes. :thumbsup: A lot of people in the UK fill their old Citroens with a quarter tank of diesel, and three quarters vegetable oil from the supermarket (much cheaper than diesel) and drive them problem free for a really low cost
In an interseting twist - one of my colleagues (A Graphic Designer) looked over my shoulder the other day at my computer screen, saw what I was working on and said "can I have a go at that?" ... I've sent him my models and a design breif, and am rather interested to see what he comes up with. :licking:
I'm grinning from ear to ear at the moment. One thing after another pops up that I've already been looking at or am currently considering.
That twin HST pump you mention/show ... I'm seriously considering adding a couple of those to my shipment from surpluscenter so I can make a pair of small bulldozers for kids later on in life. Using 7cu wheel motors will give nice, slow, safe walking speeds, and HUGE torque
However.. Driving cylinders with them is possibly a bad idea for the reason you mention, and you'll only be able to drive 2 cylinders with one pump... unless you invest in valves... and even then I'm not sure the "semi-closed circuit" HST pumps would be happy. The Gurus on here will know. I'm a hydraulic newbie too and my opinion should be treated with caution
I'm only unsure about the hydraulic PTO motor and how to drive /control that.
I'm thinking that a simple bank of six 8gpm spool valves will do the job just fine for me, and a 5 or 8gpm belt-driven pump.
I'm resigned to the fact that this project won't come cheap...
The HST pumps might share the same chain (as yet undecided - I prefer separate chains really), whereas the PTO pump will have one to itself. A different gearing between the two may be needed at some point
My neighbour sells motorbikes in one of the biggest dealerships in Sweden... and obviously has access to vast amounts of different sprockets and chains - I'll get a good price
The smallest of all the pumps will probably end up being V-belt-drive from somewhere - I don't see that one as a problem.
When it comes to coupling and alignment, I have a pair of R+W EK2 elastomer couplings (300 series) on my desk. They're overkill but perfect for the job.
R+W | ELASTOMER COUPLINGS | EK2
The secret to a problem-free alignment is to use TWO coupings to mimic a driveshaft or PTO shaft with a coupling at each end. R+W actually produce a unit specifically for that. R+W | ELASTOMER COUPLINGS | EZ2
And it's this what I'll be mimicing with my couplings. you can even mount your engine on rubber bushings if you fancy, and separate the vibration from the rest of the chassis.
The TUD5 engine was used in the Citroen AX, the Peugeot 106 and the Citroen Saxo. They're REALLY common over on continental Europe and the UK. I'll nip over and get one when the time comes. :thumbsup: A lot of people in the UK fill their old Citroens with a quarter tank of diesel, and three quarters vegetable oil from the supermarket (much cheaper than diesel) and drive them problem free for a really low cost
In an interseting twist - one of my colleagues (A Graphic Designer) looked over my shoulder the other day at my computer screen, saw what I was working on and said "can I have a go at that?" ... I've sent him my models and a design breif, and am rather interested to see what he comes up with. :licking:
