Tigercat Hydrostatic Demonstrator Part One

A Tigercat classic, the Tigercat Hydrostatic Demonstrator video clearly details the inner workings and advantages of Tigercat's revolutionary hydrostatic skidder drive system.

Downloaded from http://www.tigercat.com & split in to two part to meet 10min. limit

Category:

Autos & Vehicles

Tags:

• Tigercat
• Hydrostatic
• Demonstrator
• inner
• workings
• macannic
• macannical
• hydrolic
• forestry
• forest
• machines
• equipment

[chilt02]

thats pretty sweet, it seems like the transmission could even lower the cost of repair over a conventional transmission due to its simplicity,

i also noticed that there was a bath of fluid in the chamber with the swash plate, is that just hydralic oil or is it a type of gear oil that has better sheer resistance properties

[steam0001]

Not sure. I will have to ask someone about it.

[Msashman]

which allows dirt to settle out of it, heat to radiate from it, and air and water to separate from it. Normally case drain lines are installed on the upper side, to ensure the case is always full, however in this case (pardon the pun), the drains are plumbed on the bottom to help show the rotary groups as they work.

[Msashman]

That's hydraulic oil. It's actually leaking into the case past the pistons, through the slipper pads and between the barrel face and lens plate. In order for two parts to move relative to each other there has to be clearance. These clearances in pumps and motors allow pressurized oil to leak into the case. They are actually designed to take advantage of this fact for three reasons: flushing, cooling and lubrication. This way the leakage oil is always being routed back to the reservoir,

[Msashman]

@FJoeForty Excellent question! I'm not an engineer, so I can only speculate but I don't think there's a reason they can't exist on-highway, instead I think that a mechanical transmission has a better cost/benefit factor than a full hydraulic system, and therefore is more ideal for mass-produced transportation like cars and trucks. Also, hydraulic components are far more sensitive to contamination and poor oil condition, thereby requiring more maintenance than a gearbox might.

[Msashman]

@hystat It is indeed!

[FJoeForty]

@Msashman After coupling two helical gear transmissions together, just so I can can have enough ratios to crawl in a vehicle that I also drive on the highway...I was left with less than ideal drive line lengths and steep working angles. I would much rather have gone hydraulic and have unlimited variability. Any reason why hydrostatic transmissions seem to be allocated to off the highway only? Are there reasons why this can't exist in a passenger car or light duty truck?

[hystat]

looks like Rexroth stuff

[Msashman]

btw, I work in the rebuild center at Tigercat, and the guy with the beard and the checkered shirt at 1:17 is my boss lol, he built the demonstrator. He's a genius when it comes to fluid power systems.