We offer five different wheel-sprocket combinations.
High-traction
rubber and light weight make these wheels ideal for robots. The wheels in our kits are
four inches in diameter and 1.5 inches wide.
We also offer 5" and 6" 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 a 28-tooth sprocket available.
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).
The side opposite the sprocket is
fitted with a ball bearing. All bearings have an inside diameter of 1/2".
This
section view shows all five components in the final assembly. The inner
race of the ball bearing extends into, (but does not touch), the inside
diameter of the hub. The width of the assembly is 2.23" to 2.24" which fits into our 2.25" wide
modular drive units and
robot kits.
The 4" wheel with this combination of components weighs
in at just 1.1 pounds - or 4.4 pounds for four wheels.
This
wheel is very easy to use because the axles do not
need to rotate. That saves the 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" wheels included but they are also
available separately. Our 5" 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 provide
detailed drawings.
Here is a chart showing the various wheel/sprocket combinations:
Wheel
Diameter
Sprocket
Teeth
Speed
(MPH)*
Cost
Order
4"
19
9
$49
5"
19
12
$51
5"
28
8
$54
6"
19
14
$54
6"
28
10
$56
* 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).
High-traction
rubber and light weight make these wheels ideal for robots. The wheels in our kits are
four inches in diameter and 1.5 inches wide.
We also offer 5" and 6" wheels.
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 a 28-tooth sprocket available.
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).
The side opposite the sprocket is
fitted with a ball bearing. All bearings have an inside diameter of 1/2".
This
section view shows all five components in the final assembly. The inner
race of the ball bearing extends into, (but does not touch), the inside
diameter of the hub. The width of the assembly is 2.23" to 2.24" which fits into our 2.25" wide
This
wheel is very easy to use because the axles do not
need to rotate. That saves the cost of mounting the axles in bearings. The picture on the left shows the wheel
mounted in our