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What are the similarities and differences between worm gear slewing drive and spur gear slewing drive?
Publish time：2021/07/10 News Views：64
Worm gear slewing drive and spur gear slewing drive are both highly integrated modular slewing reducers. Users do not need to purchase individual parts one by one and then assemble them into products with worm gear slewing drive and spur gear slewing drive functions. Reduce unnecessary production preparation procedures, greatly improve production efficiency. In a sense, the spur gear slewing drive can replace all geared slewing bearings. Compared with slewing bearings, it has the advantages of simple installation, easy maintenance and greater saving installation space.
What are the similarities and differences in the design and use of the worm gear slewing drive and the spur gear slewing drive? Unique transmission will answer for you.
Worm gear worm shaft slewing drive and geared slewing drive/spur gear slewing drive both use slewing rings as the main moving parts. The slewing bearings play the role of driving the equipment to rotate and bearing the equipment load. The worm or gear is used as the driving part of the power input, housing, flange, general purpose support bearings, seals, etc. as accessories, can finally achieve 360° rotation through reasonable design and assembly, they can withstand large loads and are components with deceleration function. Both types of slewing drives have the characteristics of slewing, deceleration, bearing load, compact structure, fully sealed, dustproof and waterproof, modular design, convenient installation and maintenance.
(1).The worm gear worm shaft slewing drive uses a worm shaft to drive the slewing ring to rotate, the geared slewing drive uses gear rotation to drive the slewing ring to rotate.
(2).The worm gear worm shaft slewing drive has a large gear ratio, the gear type slewing drive has a small gear ratio.
In the case of the same module and the same outer diameter, the gear ratio of the worm gear worm shaft slewing drive is equal to the teeth number of the slewing ring; The gear ratio of the gear type slewing drive is equal to the teeth number of the slewing ring/the teeth number of the gear. The teeth number of the gear is generally designed to 15 teeth, the gear ratio is 15 times different.
(3).The worm gear slewing drive has the characteristics of reverse self-locking, and the gear-type slewing drive cannot be reversed self-locking.
The worm gear worm shaft slewing drive can only be driven by the worm shaft to rotate the worm wheel, the worm wheel cannot be driven by the worm shaft to rotate. The reverse self-locking makes the slewing drive widely used in lifting equipment, aerial work platforms and other equipment. Under such working conditions, using worm gear worm shaft slewing drive does not require a braking device. In the absence of power, the equipment can still remain stationary for a long time. The gear of the gear type slewing drive can drive the gear ring to rotate, the gear ring can also drive the gear to rotate in reverse, but cannot achieve reverse self-locking. This feature is also used in some special fields, such as wood grabbers, snow sweepers, etc. These devices cannot avoid collisions during use and do not self-lock in the event of a collision, which acts as a buffer to protect the equipment.
(4).Worm gear slewing drive limited speed is low, gear type slewing drive limited speed is high.
The worm gear slewing drive is driven by worm gear and worm shaft, worm gear and worm shaft slide on each other, high-speed rotation is easy to generate heat, causing the worm shaft to overheat and lock or directly damage. Generally, the worm gear slewing drive speed does not exceed 2.5 rpm; The gear type slewing drive works by the meshing of teeth and teeth, it’s not easy to generate heat, the speed can usually reach 40-60 rpm.
(5).Worm gear slewing drive transmission efficiency is low, gear type slewing drive transmission efficiency is high.
The friction force between the worm gear and the worm shaft of the worm gear slewing drive is large, transmission energy loss is large, so the transmission efficiency is low, usually only 30%-40%; The friction resistance between the gears of the gear type slewing drive is small and the loss is small, so the transmission efficiency is high, generally reaching 90%-95%, which is very efficient and saving energy.
(6).Worm gear slewing drive has low rotation accuracy, gear type slewing drive has high rotation accuracy.
The rotation accuracy of the ordinary worm gear slewing drive is affected by various factors, it is impossible to achieve a small backlash. The accuracy of the precision type worm gear slewing drive can reach within 0.05°; The gear type slewing drive has high rotation accuracy, gears and gear rings can be processed by grinding teeth, which can achieve higher accuracy. The gear type slewing drive with a diameter of 1 meter can achieve an accuracy of less than 0.01°.
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