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MULTIROTORS & UAVS BALLOONS & BLIMPS GLIDERS & PLANES GROUND STATIONS ROBOTS & UGVS RECREATIONAL BOATS & ROVS LIMITED SUPPLY ITEMS

 

Robots, Unmanned Ground Vehicles, and Systems



 

Modular Drive Units

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With the Modular Drive Units you can easily construct a mobile platform that is exactly the length and width you need. Each unit is basically one half of one of our middle weight drive modules. It includes a 10" length of the 3/8" extruded square tubing. The tube houses a two-stage chain-and-sprocket speed reducer and a 4" wheel. It bolts right up to our E-150, A28, or F30 motors.

This unit is very easy to use. Just bolt it in place, plug it in, and go play! You can easily mount these modules into your robot by drilling and tapping four 1/4-20 screw holes right into the 3/8" aluminum wall. You can also mount other components directly to the module using more tapped holes. We left the hole locations up to you so that you would have maximum flexibility in mounting. Modular Drive Units (MDU) are available in Standard (5.6) and Hi Speed (3.4) Ratios.

MDU Standard Ratio : 5.6 E-150: 4700 RPM : 09 MPH
MDU Standard Ratio : 5.6 A28-400: 4900 RPM: 10 MPH - MDU Hi-Speed: 17 MPH
MDU Standard Ratio : 5.6 A28-150: 6000 RPM: 12 MPH - MDU Hi-Speed: 20 MPH

Nine to twelve MPH is plenty fast for almost any type of sport or competition robot with MDU standard 5.6 reduction ratio. Reduction ratios may be fully customized upon request.

The extrusions are symmetrical so your motor can be mounted on either side. We call these "Type-A" and "Type-B". The two pack kit includes one of each for two wheel drive robots. The four pack kit includes two of each type for typical four wheel drive robots. No chain tensioners are used in the modular drive units. The axle locations are machined to such tight tolerances that chain tensioners are not required, minimizing parts count. The standard ratio uses sprockets with 9 and 24 teeth.

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Wheel/Sprocket Combinations


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We offer nine different wheel-sprocket combinations. High-traction rubber and light weight make these wheels ideal for robots. Wheels are four or five inches in diameter and 1.5 inches wide. We also offer 5",6",8, and 10" wheels. A 1/4" keyway is broached into the wheel. The 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. A bronze bearing is pressed into the sprocket, then the sprocket/bearing assembly gets pressed into the wheel. All 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". The section view above 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.

 

NOTE:
By selecting "BUY NOW" you confirm you have read, understand, and agree to all our Terms & Conditions. International shoppers: Please request  shipping quote.

FREE USA Shipping
Delivery Schedule: 4-14 days

Standard ratio MDU (2 Pack)
329




Standard ratio MDU (4 Pack)
595




High Speed MDU (2 Pack)
329




High Speed MDU (4 Pack)
329



 

MODEL
WHEEL DIAMETER
SPROCKET TEETH
MPH
LBS
PRICE

FREE USA SHIPPING
419HP 4" - SPECIAL HARD PLASTIC 19
#35 roller chain (3/8" pitch).
9• 1.0 4 PACK: 239

419 4" - RUBBER 19
#35 roller chain 3/8" pitch
9• 1.1 4 PACK: 239

519 5" - RUBBER 19
#35 roller chain 3/8" pitch
12• 1.4 4 PACK: 239

528 5" - RUBBER 28
#35 roller chain 3/8" pitch
8• 1.6 4 PACK: 239

619 6" - RUBBER 19
#35 roller chain 3/8" pitch
14• 1.6 4 PACK: 239

628 6" - RUBBER 28
#35 roller chain 3/8" pitch
10• 1.8 4 PACK: 239

828 8" - RUBBER 28
#35 roller chain 3/8" pitch
13• 2.5 4 PACK: 249

8-42 8" - RUBBER 42
#35 roller chain 3/8" pitch
9• 3.0 4 PACK: 249

1042 10" - RUBBER 42
#35 roller chain 3/8" pitch
11• 3.6 4 PACK: 259


 

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