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Types and Mechanisms of Gear Reducers
Gear reducers are representative of transmission systems. Based on the type of gears, shaft arrangement, and gear configuration, currently used reducers can be classified as follows: (1) parallel-shaft gear reducers, (2) orthogonal-shaft gear reducers, (3) vertical non-intersecting-shaft gear reducers, and (4) coaxial gear reducers.
Types and Mechanisms of Parallel-Axis Gear Reducers
Parallel‑shaft gear reducers employ spur, helical, or herringbone gears, with the input and output shafts arranged in parallel. Typical reduction ratios range from 1:1 to 1:7 for single‑stage units, 1:10 to 1:30 for two‑stage units, and 1:5 to 1:200 for three or more stages. The general characteristics of parallel‑shaft gear reducers are as follows:
For high-precision gears, the transmission efficiency is very high (98% to 95% for a single-stage gear reducer).
As long as it is properly lubricated, it can last a very long time.
Because standardized gears are used, they can be manufactured relatively inexpensively.
A gear reducer with spur gears is used to increase speed.
Spur gear reducers are typically larger in size. Compared with worm gear reducers of the same reduction ratio, they have a bulkier external profile, more components, and a less favorable structural design. Consequently, they are employed in machinery where the load-side rotational speed is relatively high, or in applications requiring a rotational speed higher than that of the prime mover (to increase speed). The types of gears are shown in Table 2.1.
Parallel-shaft gear reducers typically use helical gears and are employed in steel‑making equipment, marine vessels, cranes, elevators, conveyors, and more. In automated machinery, they are also referred to as gear motors—gear reducers that are directly coupled to an electric motor.
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Shenzhen Jier Transmission Equipment Co., Ltd. is a high-tech enterprise that has been focusing on the sales, maintenance, and technical services of reducers for more than ten years. It is the core agent of world-renowned brands such as SEW reducers, NORD reducers, Bauer reducers, and Baumer sensors in Switzerland in Germany
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