The slewing drive is a particular rotary reduction product derived from the slewing ring product with high integration and large gear ratio, simple structure, easy use, and maintenance because the slewing ring is used as the follower and the frame basis, the inner and outer rings of the slewing ring are used to realize the input and output of the driving power respectively so that the slewing drive can not only achieve 360-degree rotation without a dead point but also can install a driving power source based on the slewing ring frame at the same time. Hence, its transmission efficiency is high; it’s a new mechanical transmission device family member. Also, because it is essentially a speed reducer, it can be called a rotary reducer, slewing ring reducer, or drive slewing ring.

The Basic Technology Introduction About Slewing Drive

The slewing drive can be divided into gear and worm gear shaft drives according to different transmission forms. The other closed state of the worm gear can be divided into open and closed 2 types. The most straightforward slewing drive is used in excavators, and tower cranes drive slewing rings on construction machinery products. As the last link of the reduction transmission chain, this slew drive is an open type of gear transmission, its front end also needs to be equipped with a planetary reducer with a large gear ratio as its power input, so it can only be called the prototype of slewing drive.

A slewing drive with integrated worm gear worm shaft transmission has been developed to expand the application range of such products and further improve the convenience of product use and maintenance. To further enhance the drive capacity of the product, the enveloping worm shaft transmission is also applied to such products. The slewing drive equipped with an envelope worm increases the driving torque and improves the driving accuracy. It can also be digitally controlled. Therefore, it is widely used in tracking and fine-tuning devices on solar and wind power generation equipment. In addition, it has sound application effects in robots, radar, low-speed heavy-duty lifting equipment, lifting equipment, and precision CNC turntables.

Performance Parameters

Slewing Drive Selection Guide

Slewing drive products can be divided into open type and closed type according to the closed condition of the transmission. According to different transmission forms, they can be divided into gear type and worm gear type. HZPT has these products, and users must make choices based on their application requirements and use environment.

Generally, the closed structure is used in humid, medium dust, or corrosive gas environment and those with high environmental protection requirements that do not allow the leakage of lubricating grease. The closed environment can effectively prevent impurities from entering the slewing drive body and improve the machine service life. However, sealing parts will accelerate wear and quickly fail when there is too much dust in the environment, and the slewing drive is entirely placed in the dust. The closed environment may not be convenient for maintenance and parts replacement. However, it is more appropriate to use an open structure slewing drive with the selection of tooth surface hardening to improve the durability of the parts. In addition, the open structure is convenient for cleaning impurities. If the use and maintenance can be done well, it may not have a shorter life than the closed structure, so all factors must be considered comprehensively in the product selection process.

To meet the diversified needs of the construction machinery field for full circle slewing drive products, HZPT has developed a slewing drive that can be adapted to construction machinery. It can be used on cranes, lifting machinery, and excavator tooling attachments. The specially designed slewing drive for construction machinery overcomes the shortcomings of low efficiency and extensive wear of the original worm gear worm shaft transmission. Combined with the heavy-duty characteristics of the envelope worm drive, the volume of various construction machinery can be further reduced, and the efficiency further improved. We recommend using a unique worm slewing drive for low-speed and heavy-load excavator tooling, lifting, and hoisting machinery.

Slewing Drive Series

The slewing drives designed and produced by HZPT are available in EWA, EGA, EGE, and other series. The slewing drive can also be equipped with hydraulic motors, AC motors, DC motors, servo motors, stepping motors, etc. The bases of the slewing drives have an open type and closed type. Generally, the open structure slewing drive is mainly used in applications where the environment is too wicked, and the maintenance and maintenance cycle is short. The open structure slew drive is more convenient for inspection, maintenance, and service of the machine parts and also more suitable for replacement. However, the closed structure can provide a longer service life when the environmental conditions have not changed much, and the environmental pollution level is below the medium level.

The Applications About Slewing Drive

What is the slewing drive used for?

Slewing drives are used in a wide range of fields such as solar tracking systems, industrial machinery, and equipment, construction machinery and equipment, construction machinery and equipment, as well as forestry machinery and agricultural machinery.

Forestry machinery
  • Logger
  • Timber grab
Mining Equipment
  • Feeding crusher
  • Lifting elevator
  • Coal mine drilling machine
Lifting equipment
  • Automobile crane
  • Track crane
  • Aerial work platform
Automated industry
  • Welding positioner
  • Industrial robot
  • Machine tool
  • Beverage filling line

Why Choose Our Slewing Drives?

–Customer can choose the motor according to our already designed slewing drive connect dimension.

–We can design the connecting structure according to the customer’s motor connect dimension.

–We can help provide the parts with Hydraulic motor, DC motor, AC motor, Stepper or Servo motor.

FAQ About Slew Drives

1. What is the prime mover for slew drive?

A: An electric or hydraulic motor is the prime mover for slew drive.

2. Does slew drive requires a brake or not?

A: Depends upon the requirement and application.

3: Where is slew drive used?

A: Slew drive is used for any machine having turning movement. Usually, it is used with slew bearings with internal or external teeth, and the gearbox has a pinion on the output shaft that drives the big gear of the slew bearing.

4. What type of gearbox is used in slew drive?

A: Planetary gearbox is used in slew drive.

5: What kind of braking arrangement is provided for slew drive?

A: Normally, slew drives are electric or hydraulic. The electric type has got shoe type brake or Negative electromagnetic brake on the motor. At the same time, the hydraulic type has got a multidisc hydraulic brake.

6. What type of bearings are used in this slew drive?

A: Spherical or roller bearings are usually used in the slew gearbox output shafts to take care of high radial loading.

7. Which type of pinion is used in the slew drive?
A: Normally, the slew drive has a pinion with a corrected profile to ensure a complete contact pattern with bearing gear.

8. How is backlash adjusted in slew drive?

A: To adjust the backlash between the pinion and slew gear, the gearbox’s mounting is slightly eccentric to adjust the backlash precisely.

9. Slew drive is used for which applications?
A:  Slew drive is used for stacker, ash handling reclaimer, windmill, tower cranes, and excavators.

Additional information