Subject:
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Variable Transmission
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 22 May 2003 08:23:27 GMT
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Viewed:
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614 times
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Hi All,
I am looking at ideas on how to construct a Constantly Variable
Transmission. I have read Gerard Steenbeek’s post on his IVT system as used
on John Deer agricultural equipment and had a look at the design. The
original post is at http://news.lugnet.com/technic/?n=9724
I wonder if I could ask a few questions about it which hopefully someone can
answer.
a) Does this design actually give you high and low ratio’s like a gearing
down/up effect?
b) If so, is there more torque in the lower rations than in the higher ratios?
c) Presumably, if you spin the motors at the same speed, the output shaft
does not spin (what Gerard calls power zero)?
d) Is the maximum speed of the output shaft the maximum speed (less
friction) of one of the motors?
I am planning to build a model which will need low ratios to overcome
initial inertia (as it may be quite heavy) and then high ratios once moving
to maintain higher speeds. It is possible this model may weigh around 1kg
and have 4 drive axles. I am wondering if this mechanism will have any
benefits over directly driving each axle with a motor.
Any thoughts?
Thanks,
Tim
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Message has 1 Reply:
 | | Re: Variable Transmission
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| (...) Yes it does, but you`ll have to perfect the gear ratios, mine didn`t run that well on 10+ year old Lego motors. (...) ratios? On the real tractor, yes. We now actually own one, and at lower speeds there is more torque. But with my lego design (...) (22 years ago, 23-May-03, to lugnet.technic)
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