Subject:
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Re: Variable Transmission
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 23 May 2003 01:24:52 GMT
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Viewed:
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809 times
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> a) Does this design actually give you high and low ratio's like a gearing
> down/up effect?
Yes it does, but you`ll have to perfect the gear ratios, mine didn`t run
that well on 10+ year old Lego motors.
> b) If so, is there more torque in the lower rations than in the higher
ratios?
On the real tractor, yes. We now actually own one, and at lower speeds there
is more torque. But with my lego design it will depend on gearing, and the
power of a motor running at a lower voltage.
> c) Presumably, if you spin the motors at the same speed, the output shaft
> does not spin (what Gerard calls power zero)?
The motors did not run at the same speed, it will depend on the gearing. In
the differential version the 2 input shafts had to turn at the same speed
but opposite direction. Also in "Power Zero"(John Deere term) you cannot
turn the output shaft. The motors actually work on on keeping it still. On
the real tractor you can park it on a hill leave it in the Power Zero state
and you will not need to apply the brake or parking brakes and it will stay.
> d) Is the maximum speed of the output shaft the maximum speed (less
> friction) of one of the motors?
Going to depend on gearing, I have gotten it to go faster and slower than
one motor just by adjusting the control motor. But I could not get that one
to go to Power Zero or Reverse.
> 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.
I think it is possible. get the gearing right and it may happen. I could not
stop the output shaft with nmy fingers from turning when it was at low
speeds.
I`m gonna rebuilt it with new motors and an RCX, and a new style
differential... should be a lot easier than using potentiometers. I`ll try
to put some wheels on it too.
Gerard
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Message is in Reply To:
 | | Variable Transmission
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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 (URL) (...) (21 years ago, 22-May-03, to lugnet.technic)
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