A face-mount (MM7300SA) model in the NEMA-34 configuration (threaded holes in the reducer face and a 0.75-in.diameter, 1.5-in.-long shaft with a standard 0.1875-in. keyway). Other options include an offset shaft, mounting from the reducer side via through holes in the reducer flange, base mounting, and custom shaft and flanges. In the design and prototype stage is an industrial-grade, right-angle planetary reducer for use in tight spaces. It's expected sometime this year. A maker of hand-operated movers for boats and airplanes needed a motor drive able to provide a high power density. A quarterhorsepower parallel-shaft gearmotor proved too large and a servodrive was considered overkill. The solution came through use of a new planetary gear reducer from Groschopp, Sioux Center, Iowa. It operates at input speeds to 4,000 rpm for servolike performance at about the same cost as a parallel-shaft gearmotor. In another application involving an RV slide out, the 377:1 ratio planetary gearmotor routinely operates (intermittently) at output torques to 1,200 lb-in. The new planetary units target uses where less precision is acceptable but cost is important. The design meshes a sun gear with three planet gears. Such configurations tend to last longer than parallel-shaft spur geartrains and better handle larger continuous and peak torque. Tough involute gears are pressed net shape from a sinter-hardened, powder metal which eliminates secondary machining and the associated cost. Another important design consideration is heat management because the amount of heat generated in a gearbox is proportional to transmitted power, gear ratio, and mechanical efficiency. The Motion Master 7300SA planetary unit is lubricated for life with an advanced synthetic-blend lubricant that remains stable at extreme temperatures. The lube lets the gearbox run cooler than those filled with grease but still permits operation at temperatures to 150F (60°C). A low internalfriction and high oil-viscosity index combine
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Gearboxes and Gearheads
Gearboxes and gearheads, also called gear reducers or speed reducers, are power transmission devices that use a gear arrangement in an enclosed housing to transfer energy, increase torque and reduce speed from one device to another. Gearboxes may also be referred to as gear reducers or speed reducers.
Gearmotors consist of an AC or DC motor with an integral gearbox or gear head typically used to adjust the motor's output speed and torque.
Air motors are powered by compressed air. They operate at relatively high speeds in industrial and spark-prohibited applications.
Worms and Worm Gears
Worms and worm gears are gear sets that offer high gear reduction and torque multiplication with a small footprint. A worm drive is a cylindrical gear with a shallow spiral thread that engages the worm gear in a non-intersecting, perpendicular axes configuration.
Variable transmissions are used in industrial applications to alter the speed of an output shaft.
Topics of Interest
are available with integrated spur or planetary gearboxes in single and multistage models. Dc servomotors with built-in gearheads can provide a more cost-effective solution in a smaller package than...
Speed reducer is termed a gearhead if it is entirely and directly mounted onto a motor, not just the shaft. Therefore, other speed reducers (gearboxes) are typically coupled with the shaft and then...
Planetary gears are a gearset in which all of the gears are in one plane and grouped around each other like the planets around the sun. Planetary reducers can be designed with gear sets or a set of...
William A. Bradley III
American Gear Manufacturers Association (AGMA)
GEARS AND GEAR DRIVES
The major uses of gears and gear drives are to transmit power, with...
The continuing escalation of energy costs has increased the emphasis on the efficiency of drives and drive systems. Recently, manufacturers of helical based gearing mislead engineers to believe that...