Understanding the Efficiency and Application of Planetary Drives

The , also known as a planetary drive, is a gear system renowned for its compact size, large speed reduction, and high torque transmission. It is widely used in space-constrained applications due to these features. This article will provide an in-depth look at the working mechanism, advantages, and disadvantages of the planetary drives, as well as their applications in various industries.

The Working Mechanism of Planetary Drives

In a planetary gearbox, many teeth are involved simultaneously, which enables high-speed reduction with relatively small gears. The low inertia reflected back to the electric motor is due to the joint load-bearing capacity of the multiple teeth. The high levels of torque are transmitted via the planetary gears, making these gearboxes a favorite choice for space-constrained applications.

The motor and the powered equipment should be inline when using a standard planetary gearbox. However, manufacturers offer right-angle designs that include other gear sets to provide an offset between the input and output. These specific features make the planetary gearboxes invaluable in various applications.

Specifications of a Planetary Drive

  • Input power (max): 27 kW (36 hp)
  • Input speed (max): 2800 rpm
  • Output torque (intermittent): 12,880 Nm(9,500 lb-ft)
  • Output torque (continuous): 8,135 Nm (6,000 lb-ft)
  • Approximate dry weight: 100 -181 kg (220 – 400 lb)
  • Radial load (max): 14,287kg (31,500 lb)
  • Drive type: Speed reducer
  • Hydraulic motor input: SAE C or D hydraulic

Disadvantages of Planetary Gearboxes

Despite their numerous advantages, planetary gearboxes have some drawbacks. Their design and manufacturing complexity can make them more expensive than other types of gearboxes. These gearboxes require precision production. If one gear is placed closer to the sun gear than the others, imbalances may occur, leading to premature wear and failure. The small footprint of planetary gears makes temperature dissipation more challenging, necessitating cooling for applications that operate at high speeds or encounter continuous operation.

Applications of Planetary Gearboxes

Planetary gearboxes are used in a variety of applications due to their compact size and high torque transmission. They serve as major components in wind energy plants, specifically, the rotor and the nacelle. The gearboxes in the yaw and pitch range control blade pitch, ensuring optimal energy output. The nacelle houses the gearbox, power generator, yaw system, and control system.

Other typical applications of planetary gearboxes include material handling equipment, mechanical industry, sugar industry, cement industry, chemical industry, food industry, construction industry, agricultural industry, power industry, mobile cranes, and overhead cranes. Their versatility in these applications is credited to their compact design and high torque transmission.

Why Choose WLY Planetary Drives

WLY is a global leader in the production of high-quality, efficient, and durable planetary drives. Our products are designed to meet a wide range of torque requirements, ranging from 0.05 to 1,280 kNm. We offer a broad choice of coupling flanges for hydraulic or and a wide selection of output shafts to simplify the reduction unit mounting process on industrial machinery or plants.

Our planetary drives feature new hydraulic motors with a higher-rated operating pressure and a larger, more durable motor-shaft seal. The gearbox has an updated input shaft with a robust design, and the integral motor and planetary gearbox housing bring the planetary gear set closer to the motor, increasing efficiency and reducing stress.

At WLY, we are proud of our quality assurance program, including the Type Approval Certificate from DNV. We offer top-notch services, competitive prices, and fast delivery times. We encourage you to explore our diverse range of planetary drives and contact us for your purchase needs.


Frequently Asked Questions

1. What is the maximum input power of a WLY planetary drive?

The maximum input power of a WLY planetary drive is 27 kW or 36 hp.

2. What makes WLY planetary drives stand out in the market?

WLY planetary drives are known for their high-quality, efficiency, and durability. They also feature new hydraulic motors with a higher-rated operating pressure and a larger, more durable motor-shaft seal. Our products are competitively priced and backed by a robust quality assurance program.

3. In what applications can WLY planetary gearboxes be used?

WLY planetary gearboxes can be used in a wide range of applications, including material handling equipment, wind energy plants, various industries such as chemical, construction, power, and more. They are also suitable for use in mobile cranes and overhead cranes.


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