Difference between worm gear rotary drive and straight tooth rotary drive

Worm gear rotary drive and straight tooth rotary drive are highly integrated modular rotary reducers. Users do not need to purchase individual accessories one by one, and then assemble them into products with worm gear rotary drive and straight tooth rotary drive functions. The unnecessary production preparation process is reduced and the production efficiency is greatly improved. In a sense, straight tooth slewing drive can replace all slewing bearings with teeth. Compared with slewing bearings, it has the advantages of simple installation, easy maintenance and saving installation space to a greater extent.

Then, what are the similarities and differences between worm gear rotary drive and straight tooth rotary drive in design and use? The rotary table bearing manufacturer will answer for you.

1、 Similarities:

Both worm gear rotary drive and spur gear rotary drive take the slewing ring as the main moving parts. The slewing ring plays the role of driving the equipment to rotate and bearing the equipment load. The worm or gear is used as the driving part of power input, and the shell, flange, general support bearing and seal are used as accessories. Through reasonable design and assembly, 360 ° rotation can be finally realized, Components that can bear large load and have deceleration function. Both types of slewing drives have the characteristics of slewing, deceleration, bearing, compact structure, full sealing, dust and water prevention, modular design, convenient installation and maintenance, etc.

2、 Difference:

1. The worm gear and worm rotary drive uses the worm to drive the slewing bearing to rotate, and the spur gear rotary drive uses the gear to drive the slewing bearing to rotate.

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

Under the condition of the same modulus and the same outer diameter, the reduction ratio of the worm gear rotary drive is equal to the number of teeth of the slewing ring; The reduction ratio of spur gear rotary drive is equal to the number of slewing ring teeth / gear teeth. The number of gear teeth is generally designed as 15 teeth, and the difference of reduction ratio is 15 times.

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

The worm wheel and worm rotary drive can only drive the worm wheel to rotate, but can not drive the worm wheel to rotate. The reverse self-locking makes the rotary drive widely used in hoisting equipment, high-altitude operation and other equipment. Under such working conditions, the worm wheel and worm rotary drive does not need braking device, and the equipment can remain stationary for a long time without power. The straight tooth rotary drive gear can drive the ring gear to rotate, and the ring gear can also drive the gear to rotate in turn, which can not realize reverse self-locking. This feature is also applied in some special fields, such as wood grabber, snow sweeper, etc. these equipment can not avoid collision in the process of use, and do not self lock in case of collision, which plays a buffer role and can protect the equipment.

4. The limited speed of worm gear rotary drive is low, and the limited speed of straight tooth rotary drive is high

The worm gear and worm rotary drive is a worm gear and worm drive. The worm gears and worms slide with each other. High speed rotation is easy to generate heat, resulting in overheating, locking or direct damage to the worm. Generally, the speed of worm gear and worm rotary drive does not exceed 2.5 R / min; The gear type rotary drive works by meshing the teeth. It is not easy to heat, and the speed can usually reach 40-60 rpm.

5. The efficiency of worm gear rotary drive is low, and the efficiency of straight tooth rotary drive is high

Worm gear and worm rotary drive has large friction between worm gear and worm and large transmission energy loss, so the transmission efficiency is low, usually only 30% - 40%; The friction resistance and loss between spur rotary driving gears are small, so the transmission efficiency is high. Generally, it can reach 90% - 95%, which is very efficient and energy-saving.

6. The rotation accuracy of worm gear rotary drive is low, and the rotation accuracy of straight tooth rotary drive is high

The rotation accuracy of ordinary worm gear rotary drive is affected by various factors and can not do a small back clearance. Generally, the accuracy of precision type can reach within 0.05 °; The rotary precision of spur gear rotary drive is high. The gear and ring gear can be processed by grinding, which can achieve high precision. The precision of gear rotary drive with 1m diameter can reach within 0.01 °.