Worm Gear Design Calculation Pdf Editor
Because they are widely used with industrial equipment, speed reducers and gearmotors can significantly impact your drive costs. Therefore, you should know how efficiently the various types of reducers use incoming motor power to drive a load. This file type includes high resolution graphics and schematics when applicable. Reducer type determines efficiency Though reducer efficiency may vary slightly from one manufacturer to another, the way in which the gears intersect and mesh mainly determines speed reducer efficiency. This efficiency ranges from 49 to 98%, depending on the type of reducer and number of reduction stages it contains,. Here’s a brief description of some common types and their relative efficiencies.
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In these widely used speed reducers, a worm gear drives a worm wheel to provide output motion at a right angle to the motor shaft,. The worm gear and worm wheel have non-intersecting, perpendicular axes, and the meshing action between gears occurs over a relatively large contact area. This meshing action consists primarily of a sliding motion that creates friction between the gears. Efficiency of a worm-gear speed reducer depends (in part) on its speed-reduction ratio.
High-ratio units have a smaller gear-tooth lead (helix) angle, which causes more surface contact between them. This higher contact causes higher friction and lower efficiency. Typical worm-gear efficiencies range from 49% for a 300:1, double-reduction ratio, up to 90% for a 5:1, single-reduction ratio.
For this reason, these units are usually more suitable for low ratios. Helical worm. The arrangement of gear stages in a speed reducer also affects its efficiency. In helical-worm speed reducers, a set of helical gears connected to the motor shaft drives a worm-gear set,. The helical-gear set reduces input speed (from the motor) to the wormgear set. This keeps the worm-gear reduction ratio (and size) low to maximize its efficiency. The combined efficiency of helical and worm gears ranges from 79% for a 300:1 speed-reduction ratio to 90% for a 5:1 ratio.
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Helical bevel. As with worm and helical- worm units, the output shaft of this reducer type is at a right angle to the motor shaft,. And like helical-worm speed reducers, a set of helical gears usually makes the first speed reduction. Here, spiral-bevel gears are mounted with intersecting axes, an arrangement that minimizes friction between the gears to provide 94 to 97% efficiency. The primary drawback to helical-bevel speed reducers is their higher cost than worm-gear units, especially for small ratios such as 5:1 or 10:1. But the added cost is sometimes offset in high-reduction- ratio units because their high efficiency allows the use of either a smaller reducer, motor, or both.
In-line helical. These speed reducers are often the best value for applications in which the motor and reducer are coupled in-line with the driven shaft,. Their efficiency usually ranges between 95 and 98%, regardless of speed ratio. Cost is competitive with worm-gear speed reducers where the center distance is 2-in. Helical-gear sets have parallel axes between gear teeth and small contact areas, which keeps power-robbing friction and heat low. Calculating efficiency To compare differerent types of speed reducers, first calculate the required load for your application and the efficiencies of the reducers being considered.