Subject:
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Re: Scrapers
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 13 Sep 2005 21:45:16 GMT
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Viewed:
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8444 times
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In lugnet.technic, Steve Lane wrote:
> In lugnet.technic, Nathan Bell wrote:
>
> >
> > Is it possible they have a hydraulic drive controlled by only one engine?
>
> I've never read anything to support this supposition. I've always thought
> scrapers mainly use mechanical transmissions. I know Caterpillar likes to put
> mechanical transmissions in things where other makers only use diesel-electric.
> I'm sure there will have been electric scrapers, but I'm sure the majority are
> straight diesel, with planetary's in the hubs probably.
>
> > When
> > the scraper bends down in the middle, it shortens the distance between the front
> > and rear wheels, and visa- versa. That would mean that the axles would be
> > turning at different speeds for a few seconds. Hydraulic drive would make this
> > possible.
>
> I saw a great show yesterday showing scrapers in action. The wheel spin when a
> scraper got high-centered was amazing. I think it was a clay type soil and the
> ground was really uneven, so traction was amazingly bad. I don't think the
> operators we're particularly worried about the wheel-spin at all. I doubt
> there's much synchronization between the front and rear engines other than a
> basic governor on the older machines, new computerised systems may be making
> inroads.
>
> I also saw a third type of scraper that must be relatively new called an auger
> scraper. It has a rotating auger in the bowl, which is powered, helping load the
> bowl.
>
> Theirs a link here
>
> http://rocktoroad.com/auger.html
>
> Steve
Thanks Steve. Another thought- You know those long oval-shaped arms (one end
bigger then the other) that connect the front half to the rear half? I bet
there is a chain in there that drives the auger (or blades). Maybe it is the
front engine that rotates them. Those pieces look like a cover for a chain.
Maybe I'm wrong. Actually they are more like a tread mill than blades. I think
the belly of the scraper actually does the cutting and the treadmill just pushes
the dirt up into the belly.
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Message is in Reply To:
 | | Re: Scrapers
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| (...) I've never read anything to support this supposition. I've always thought scrapers mainly use mechanical transmissions. I know Caterpillar likes to put mechanical transmissions in things where other makers only use diesel-electric. I'm sure (...) (21 years ago, 13-Sep-05, to lugnet.technic)
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