Planetary Gear Reducer

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Mining accessories

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Hebi Shuangmin Mining Machinery

Structure

An internal gear ring is tightly integrated with the gearbox housing. At the center of the ring gear is a sun gear driven by an external power source. Sandwiched between these two components is a planetary gear set consisting of three gears evenly arranged on a carrier. This planetary gear set floats freely, supported by the output shaft, the internal gear ring, and the sun gear. When the input-side power drives the sun gear, it causes the planetary gears to rotate on their own axes while simultaneously orbiting around the central axis along the path defined by the internal gear ring. The rotation of the planetary gears, in turn, drives the output shaft connected to the carrier, thereby transmitting power outward.

The internal gears of the planetary reducer are made of 20CrMnTi steel, which undergoes carburizing, quenching, and gear grinding. These gears feature compact size, light weight, high load-carrying capacity, long service life, smooth operation, low noise, large output torque, wide speed ratio range, high efficiency, and safe performance. They also combine the advantages of power splitting and multi-tooth meshing. Key components such as low-speed gears, high-speed gears, and transmission shafts are fabricated from high-quality low- and medium-carbon alloy materials, including 18Cr2ni4WA, 42CrMo, and 40Cr. The tooth surface hardness ranges from HRC58 to 64. Planetary gear reducers are lightweight, compact in size, offer a wide range of transmission ratios, boast high efficiency, provide smooth operation, generate low noise, and exhibit strong adaptability.

Feature

The transmission mechanism of planetary gear reducers differs from the conventional motion of traditional gears. Traditional gears rely solely on the contact surface between the large and small gears to transmit power, concentrating all the load at this single point of contact. As a result, these gears are more prone to friction and even fracture. In high-speed reduction ratios, additional stages of gears must be interconnected, which not only occupies considerable space but also leads to increased frictional losses. Moreover, the backlash between each stage of reduction gears accumulates in multiples, significantly reducing overall efficiency. In contrast, planetary gear reducers distribute the load evenly across six contact surfaces among the sun gear, planet gears, and internal ring gear during operation. These contact surfaces are arranged uniformly around the internal gear’s trajectory, providing a 360-degree distribution of impact loads. This design reduces gear friction and virtually eliminates the risk of gear failure. The planetary gears adopt a floating-motion design with extremely tight clearances, and adjacent stages are connected only through stepped teeth. Consequently, the overall volume of the reducer is considerably smaller, and its maximum efficiency can reach up to 97%.

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Phone

+86 18739238888

hbshuangmin@aliyun.com

Contact Address

Shilin Industrial Park, Shan District, Hebi City, Henan Province

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