Subject:
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Re: a question for those with lots of technic
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 8 Mar 2001 02:37:04 GMT
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Viewed:
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1268 times
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> The US has a HUGE fleet which makes it hard to spot trends sometimes. The
> vast majority of over the road trucks continue to be 18 wheelers (tractor
> with 1 steer axle, 2 tires, and two drive axles, 4 tires each, trailer with
> two axles, 4 tires each). However I have noticed a slight increase in the
> number of single tired axles on trailers. Very slight, so far. A single axle
> instead of two is more common. We've always had a lot of variation (trailers
> with smaller wheels for highcube low weight lading, trailers with extra
> axles, steel centipedes with 8 axles all of which can be independently
> raised to "walk around" corners, etc) so it's hard to tell.
Yeah...I'm in the US too and mostly see the usual 18 wheelers. I have seen
quite a few trash trucks though which seem to have 3 drive axles in the
back, each housing 4 wheels (making total number of wheels 14). The
interesting thing is that the rear axle that's closest to the front steering
axle seems to be liftable several inches off the ground (I have seen some of
these trucks raise and lower this axle while stationary). Anyone know what
this system is for?
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> However dual steer axles are very rare overall. Much rarer than in the UK,
> they are used only in very special situations (cranes and the like) where
> there is no way to balance the load without using them. Usually the vehicle
> itself was imported from Europe, although I have seen one Mack that had
> them. Once.
Same here; I also have only seen a 4-wheel steering verhicle in action once
(an unusually large back-hoe unit). Are these more common in European cities?
-Gaurav Thakur, raving madman
Can be reached at cp5670@supermail.com
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Message has 2 Replies:
 | | Re: a question for those with lots of technic
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| (...) Dunno about Europe, but here in australia they're reasonably common - often used for flat-trays carting building materials (brick pallets, etc). They generally have the 4 front wheels & 2 axles with 4 wheels each on the back. Many also have a (...) (24 years ago, 8-Mar-01, to lugnet.technic)
| | | Four wheels good, two wheels bad
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| (...) In a European context they are sometimes referred to as a "lazy axle" and are retracted when the load in the vehicle is empty or light. The idea is to reduce tyre wear and improve fuel economy by reducing friction etc. I would imagine that (...) (24 years ago, 8-Mar-01, to lugnet.technic)
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Message is in Reply To:
| | Re: a question for those with lots of technic
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| (...) The US has a HUGE fleet which makes it hard to spot trends sometimes. The vast majority of over the road trucks continue to be 18 wheelers (tractor with 1 steer axle, 2 tires, and two drive axles, 4 tires each, trailer with two axles, 4 tires (...) (24 years ago, 7-Mar-01, to lugnet.technic)
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