Ford pickup hydraulic hybrid (univ of idaho project)

[user removed]

Originally Posted by oil pan 4

If you want to replace your transmission with a much less efficient hydrostatic drive be my guest.
Only problem is these pumps and motors are also full of moving parts.
A fixed displacement pump could be used at the cost of efficiency.
A varrible displacement multiple piston pump that could put out around 100 horse power worth of fluid power costs at least $32,000 and weighs at least 300 pounds. I know because I have replaced a few over the years.
Then take an equally large and heavy hydraulic motor that costs, I am going to guess around $10,000 and let me know how much money this new less efficient hydraulic drive line is saving.

Nah, I'll take 97% efficiency motor in the powertrain hydraulic drive and one of these 55% efficient direct combustion to hydraulic pressure engines, which you can't touch with anything smaller than the largest diesel engine on the planet.

Chiron Free Piston Engine

More reading material, if anyone here even bothers.

http://www.innas.com/home.html

And if you want to even try harder.

US# 7677208
Here is a link for those who are cpu challenged

http://www.google.com/patents/US7677208


regards
mech

[user removed]

A hydroelectric dam is fluid powered, about 93% efficient, maybe your machines need upgrading, but probably not in the current era of cheap fuel.

Pumped storage allows peak demands to be met at much lower cost and also allows the elimination of obsolete plants as well as avoiding construction of new ones altogether.

Hydraulic motors approach manual transmission efficiency when they operate at below 1000 rpm, which coincidentally are right at wheel speed at 70 mph.

The ups trucks where the pump-motor drives the differential at prop shaft speed drop to 75% efficiency at highway speeds.

The next gen will drive the wheels directly, with 325 pounds feet of torque, per wheel, in a Mercedes Sprinter sized vehicle, with one motor per wheel.

Want to complain about the weight of the suspension? Mount the motors inboard with half shafts connecting them to the wheel-hub and dump the mass of your conventional friction (god help us all) brakes.

Or you can continue driving your direct global warming device.

Jesus, even electric cars still have friction brakes.

regards
mech

[user removed]

The powertrain of a current vehicle would put a lot of rube goldberg's contraptions to shame.
How many parts in that powertrain does the "power" actually move through?

regards
mech

[user removed]

From the cranksahft.

Flywheel, clutch disc pressure plate, throughout bearing. transmission imput shaft, imput shaft gear to countershaft gear, back through the selectable gears, to the output shaft, with half a dozen supporting bearings, propshaft, u joints, differential imput shaft, pinion gear, ring gear, axle shaft, wheel, tire, to say nothing about the numerous supporting bearings and all that lubricating oil that is pushed out between the gears and bearing balls or rollers. Also include every piece of the control linkages for the clutch, gear selection, and throttle controloif the engine that should never be throttled in the first place.

Intentionally removed all but comma punctuation.

regards
mech

[user removed]

Now replace all that crap with.

Accumulator. supply and return hydraulic conduits (could be mostly tubular frame components), control circuit for stroke position, and my patented drive (prior post for those who actually ready anything I post or link).

Remember throw away the complete induction control system on the engine and throw away the complete hydraulic brake system, master cylinder, all lines, all calipers, rotors or drums, friction material, attachment hardware, backing plates, fluid, reservoirs for fluid.

My design works completely submerged.

25% FEWER PARTS PER VEHICLE, NEGATIVE PAYBACK PERIOD. COSTS LESS TO BEGIN WITH.

regards
mech

[cRiPpLe_rOoStEr]

I'd probably never buy a vehicle which didn't have friction brakes at least as an emergency feature.

[user removed]

A true emergency brake is a completely independent system. A hydraulic drive could be valved to block any flow and a cable operated completely separate emergency brake is another option. In the old days they braked the prop shaft.

USA requires an emergency brake, but not completely independent of the regular system, although it should be.

regards
mech

[oil pan 4]

Sounds like you should build a few demo models..

[Hersbird]

Garbage trucks are also very expensive to begin with, over $250,000 for a new cab and new compactor/lift. A new delivery step van for UPS or FedEx is less then $60,000. If the hybrid system costs $10,000 it easier to sell it as a 4% increase compared to a 18% increase.

[Hersbird]

Ohio Town Welcomes First Hydraulic Hybrid Garbage Trucks | Waste Management content from Hydraulics & Pneumatics
They say saving 4,000 gallons of diesel per year per truck. That's pretty good. They also mention it's a heavy system, probably another reason you don't see it on a 2 ton step van (payload) but you might on a 20 ton garbage truck.