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1950 Allis-Chalmers bulldozer converted to tree harvester - photos
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High drive before cat ever thought of it
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So where is a video showing it in action?
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In college I asked the heavy eqp teacher what the purpose of high drive was an the teacher did not remember. I have always wondered. Is it to keep the sprocket out of the dirt just a bit more?
Eric
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Quote:
Originally Posted by
suther51
In college I asked the heavy eqp teacher what the purpose of high drive was an the teacher did not remember. I have always wondered. Is it to keep the sprocket out of the dirt just a bit more?
Eric
Eric; cat came out with their high drive so they do do away with the type of final reduction gearing required to allow ground clearance for the dozers which was a single small gear driving a larger gear and the steering clutches By going to the high drive a planetary final reduction drive system could be used which allows for a much higher transmittal or power other considerations were this now raised the drive sprockets out of the muck and rocks associated with moving dirt reducing wear on not only the drive sprockets but the track links as well. the undercarriage could now have slightly more independent vertical travel as well, the wishbone pivot with the high drive is much stronger than having the undercarriage pivot around the old final drive system so there were many advantages to going to the high drive system
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Put that way it makes all the scenes, first time I came across planetary gears was in a cordless screwdriver as a kid. Been fascinated ever since.
Eric
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Planetaries are very popular in large earth moving equipment. They are fascinating and I have to admit to tearing a couple apart ( very small ones) just to look.
Quote:
Originally Posted by
suther51
Put that way it makes all the scenes, first time I came across planetary gears was in a cordless screwdriver as a kid. Been fascinated ever since.
Eric
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The nice thing about epicyclical gearing is by capturing various components such as the ring the planetary carriage or even the sun gear switching out which member is driven or driving you can have several differing ratios with a single pack having packs mounted back to back will double or triple the available ratios even though the complexity might become ridiculous. The gear sets don't need to be strictly linear either as there can be a sun gear then a set of orbital in a carriage with an internal external ring followed by another set of orbital gears topping off with a final internal toothed ring
