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Robot Wheels
We offer nine different wheel-sprocket combinations.
 High-traction
rubber and light weight make these wheels ideal for robots. The wheels in our kits are
four or five inches in diameter and 1.5 inches wide.
We also offer 5",6",8, and 10" wheels.We broach a 1/4" keyway into
the wheel. Our custom one-piece hub/sprocket also gets a 1/4" keyway
machined into the hub. A steel key locks the wheel and sprocket together
so the torque on the sprocket gets transferred to the rubber tire. |
 The hub/sprocket is made from
chrome-moly steel. All our kits use sprockets with 19 teeth. We also
have 28 and 42-tooth sprockets available.
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|  A bronze bearing is
pressed into the sprocket, then the sprocket/bearing assembly gets
pressed into the wheel. Our sprockets are made to be used
with #35 roller chain (3/8" pitch).
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|  The side opposite the sprocket is
fitted with a ball bearing. All bearings have an inside diameter of
1/2".
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 This
section view shows all five components in the final assembly. The width of the
4" and 5" wheels is 2.24" which fits into our
modular drive units and
robot kits. All other wheels are
2.34" wide.
The 4" wheel with this combination of components weighs
in at just 1.1 pounds - or 4.4 pounds for four wheels. See the chart
below for the weights, pictures, and drawings of the other wheels. |
 This
wheel is very easy to use because the axles do not
need to rotate. That saves the time and cost of mounting the axles in bearings. The picture on the left shows the wheel
mounted in our Modular Drive Unit. |
All our kits have the 4-19 wheels included. Our 5-28 wheels can also be used on the kits,
(with some modifications). The ground clearance on our kits can be increased with both the 4" and 5"
wheels with a little extra machining. Contact us and we will give you a
quote for the custom machining or we can provide detailed drawing if you
choose to make the change.
| Part # |
Pic |
Drawing |
Wheel
Diameter |
Sprocket
Teeth |
Speed
(MPH)* |
Weight
(lbs.) |
Cost |
Order |
4-19
HP** |
 |
 |
4" |
19 |
9 |
1.0 |
$44 |
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| 4-19 |
|
|
4" |
19 |
9 |
1.1 |
$39 |
|
| 5-19 |
|
|
5" |
19 |
12 |
1.4 |
$40 |
|
| 5-28 |
|
|
5" |
28 |
8 |
1.6 |
$41 |
|
| 6-19 |
|
|
6" |
19 |
14 |
1.6 |
$42 |
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| 6-28 |
|
|
6" |
28 |
10 |
1.8 |
$43 |
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| 8-28 |
|
|
8" |
28 |
13 |
2.5 |
$45 |
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| 8-42 |
|
|
8" |
42 |
9 |
3.0 |
$47 |
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| 10-42 |
|
|
10" |
42 |
11 |
3.6 |
$49 |
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* Indicates the speed at which a vehicle would travel if the
wheel was driven with a 9-tooth sprocket which is revolving at 1700 RPM.
(As they are in our kits when using our E-150 motors and our speed reducer).
** The 4-19HP is a special hard plastic wheel that reduces
traction but also makes turning easier and reduces power consumption
while turning. Two 4-19HP wheels can be used in combination with two regular
high-traction 4-19 wheels. This will give a good combination of traction
and ease of turning in robots that do not require uncompromised traction. Educational
and experimental robots along with robots intended to operate on carpet work
best with two, (or even four), hard plastic wheels.
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