These speed reducers are made with a three-piece aluminum case that has been precision CNC machined. A total of six sprockets, three roller chains, and five bearings comprise the mechanism. The long output shaft makes it easy to mount pulleys, sprockets, gears, or wheels in the required position. Care was taken to make this unit as compact as possible. The overall dimensions are 6 inches x 3 inches x 2 inches. But the motor is recessed slightly into the reducer, so the net length added to the motor is only 1.8 inches.
The speed reducer uses a unique arrangement of roller chains. This results in torque and efficiency comparable to gear-type reducers at just 1/2 or even 1/3 of the cost of high-torque, geared speed reducers. There is slightly more noise, but these units are ideal when silent operation is not required
The output shaft is 3/4-inch diameter and 2.2 inches long. It has a 1/4-inch keyway and a 5/16-24 tapped hole. The shaft and the large final sprocket are made from a single piece of steel to maximize strength. If something other than the 1/4-inch key is required, step key stock is available.
A single stage of roller chain reduction is generally considered to be about 98% efficient. Add in some friction from the five bearings and we are at about 90% efficiency.
Four long 1/4-20 bolts go all the way through the width of the reducer. The four mounting bolts are supplied with the unit. They are sufficient in length to mount the gear motor to a 3/8-inch thick panel. If the panel is thicker, longer bolts will be needed. Do not operate the speed reducer with bolts that are missing or too short - they are required for structural integrity.
The fan-motors have ventilation holes in the front and rear aluminum plates to allow for flow-through cooling. The holes in the front plate are positioned so they are not blocked when mounting the motor to a flat surface. These motors also feature low-profile motor leads for better fit into smaller spaces.
Peak Horsepower 4.3 4.6
Motor Diameter (inches) 3.0
Reduction Ratio 8.3:1 8.3:1
Stall Torque (in-lbs 1290
Nominal Voltage 48V
No-Load RPM 880
0-A28-150-F48-GMeasurements Performance Chart