What is the difference between a worm gear and a geared rotary drive?

Worm gear rotary drive and gear rotary drive are highly integrated modular rotary reducers, users do not need to purchase individual parts one by one and then assemble them into products with the functions of worm gear rotary drive and gear rotary drive. Reduce unnecessary production preparation procedures and greatly improve production efficiency. In a sense, the gear-type slewing drive can replace all toothed slewing bearings. Compared with slewing bearings, it has the advantages of simple installation, easy maintenance, and a greater degree of saving installation space.

So, what are the similarities and differences in the design and use of the worm gear rotary drive and the gear rotary drive?

1. Similarities:

Both the worm gear rotary drive and the gear rotary drive use the slewing bearing as the main moving part. The slewing bearing plays the role of driving the equipment to rotate and bear the load of the equipment. The worm or gear is used as the active part of the power input. The shell, flange, general Supporting bearings, seals, etc. are accessories that can finally achieve 360° rotation through reasonable design and assembly, can withstand large loads, and have deceleration components. Both types of slewing drives have the characteristics of slewing, deceleration, load bearing, compact structure, fully sealed, dustproof and waterproof, modular design, and convenient installation and maintenance.
Second, the difference:

1. The rotary drive of the worm gear is to use the worm to drive the rotation of the slewing bearing, and the gear type rotary drive is to use the gear rotation to drive the rotation of the slewing bearing

2. The reduction ratio of the worm gear rotary drive is large, and the reduction ratio of the gear type rotary drive is small

In the case of the same modulus and the same outer diameter, the reduction ratio of the worm gear slewing drive is equal to the number of teeth of the slewing ring; the reduction ratio of the gear type slewing drive is equal to the number of teeth of the slewing ring/the number of teeth of the gear, and the number of teeth of the gear is generally designed to be 15 teeth. The difference is 15 times.

3. The worm gear rotary drive has the characteristics of reverse self-locking, and the gear type rotary drive cannot reverse self-locking

The rotary drive of the worm gear can only be driven by the worm, not by the worm gear. The reverse self-locking makes the rotary drive widely used in lifting equipment, aerial work and other equipment. Under such working conditions, the worm gear rotary drive is used. No brakes are required and the device can remain stationary for long periods of time without power. The gear-type slewing drive gear can drive the ring gear to rotate, and the ring gear can also drive the gear to rotate in turn. It cannot realize reverse self-locking. This feature is also used in some special fields, such as log grabs, snowplows, etc. These Collisions cannot be avoided during the use of the equipment, and will not self-lock when a collision occurs, which acts as a buffer and protects the equipment.

4. The limit speed of worm gear rotary drive is low, and the limit speed of gear type rotary drive is high

The worm gear rotary drive is a worm gear drive, and the worm gears and worms slide against each other. High-speed rotation is prone to heat, causing the worm to overheat and lock or be directly damaged. Generally, the speed of the worm gear rotary drive does not exceed 2.5 rpm; the gear type rotary drive It is the tooth-to-tooth meshing that works, and it is not easy to generate heat, and the speed can usually reach 40-60 rpm.

5. The transmission efficiency of the worm gear rotary drive is low, and the transmission efficiency of the gear type rotary drive is high

The friction between the worm gear and the worm is large in the rotary drive of the worm gear, and the transmission energy loss is large, so the transmission efficiency is low, usually only 30%-40%. Generally, it can reach 90%-95%, which is very efficient and energy-saving.

6. Worm gear rotary drive has low rotary precision, while gear type rotary drive has high rotary precision

The rotation accuracy of ordinary worm gear rotary drive is affected by various factors, and it is impossible to achieve a small backlash. Usually, the accuracy of the precision type can reach within 0.05°; the gear type rotary drive has high rotation accuracy, and the gear and ring gear can be ground. The processing method can achieve high precision, and the gear-type rotary drive with a diameter of 1 meter can reach within 0.01°.