Publish Time: 2020-12-04 Origin: Site
What's special about worm gear slew drive compared with other forms of gear transmission? I believe that many people will have this problem, then what are the advantages of worm gear slewing drive transmission, this paper takes you to understand.
1.Characteristics of worm gear slew drive
2.Advantages of worm gear slewing drive
3..Disadvantages of worm gear slew drive
It has a large transmission ratio and a very compact structure. The meshing of worm and worm gear teeth is continuous, and the number of meshing teeth is relatively more, so the transmission is more stable and the noise is relatively low. If the screw angle of worm is not as large as the equivalent friction angle between gears, the worm drive will start self-locking. In other words, only worm drive worm gear, worm gear can not drive worm. The friction loss of worm gear slew drive is relatively large, and the efficiency is also very low.
Worm gear slew drive single-stage speed ratio: the maximum single-stage speed ratio of circular gear transmission and bevel gear transmission is generally about 1 / 10, and the worm gear slew drive reducer can achieve large speed ratio with smaller external dimensions.
worm gear slewing drive transmission door: when the circular gear and bevel gear are in the centring, the rolling contact is mainly, while the worm gear slew drive is mainly sliding contact, so there are few factors causing noise and vibration. Therefore, the drive escalator, elevator, moving sidewalk and in recent years to prevent public hazards of machinery, like the use of worm gear slew drive reducer.
The arrangement of worm gear and worm shaft: the shafts can be arranged vertically without intersecting each other. Sometimes, the installation area of the prime mover and the driven machine can be saved and convenient and reasonable.
worm gear slew drive can prevent reversal: when the lead angle of worm is less than friction angle, worm gear slewing drive can not drive worm in theory, that is to say, self-locking worm transmission device can be designed. However, in fact, the friction coefficient of tooth surface changes from static friction coefficient to dynamic friction coefficient due to vibration and other reasons, so sometimes it will rotate slowly, and it is difficult to achieve complete self-locking.
Compared with other forms of n-wheel drive, worm gear slew drive has higher friction loss and lower efficiency when transmitting power. At present, due to the improvement of manufacturing method, the efficiency close to the theoretical value can be achieved. If the tooth surface of the involute cylindrical gear is under load, due to the deformation of each part, the contact state of the gear tooth changes to the better, while the contact state of the gear tooth of the worm gear slew drive changes to the bad side, that is to say, it is easy to produce the tooth surface adhesion due to the deformation of the tooth surface oil film.
Therefore, it is necessary to estimate the deformation, adjust the tooth contact state and bearing clearance during assembly, and run in operation as carefully as possible. Before the high cost, the worm gear slewing drive was made of copper alloy. Due to the special gear cutting machine, the cutting efficiency is low, and it is time-consuming to trim the tooth surface manually.
Worm gear slew drive plays a very important role in life. Although it has obvious characteristics, its disadvantages are also obvious. You can choose relevant products according to your own needs. Making good use of the advantages of worm gear slew drive can greatly improve the work efficiency.