Characteristics and differences between worm gear and belt drives. Here is a summary of the characteristics and differences between worm gear and belt drive. The main differences and characteristics are that the worm gear transmission ratio is large, the belt drive ratio is small; worm gear transmission is vertical transmission, while the belt drive is parallel transmission; worm gear transmission moment away from the small, while the belt drive distance is large; worm gear transmission efficiency is low, while the belt drive efficiency is slightly higher; the structure of the worm gear is more complex, the cost is relatively high.
I. Reducer belt drive characteristics
Transmission has a simple structure, smooth transmission, buffer vibration absorption, can be in the large axis spacing and multi-axis transmission of power, and its low cost, no lubrication, easy maintenance, etc., in modern mechanical transmission is widely used. Friction-type belt drive can slip overload, low noise, but the ratio is not accurate (sliding rate of 2% below); synchronous belt drive to ensure synchronization of the transmission, but the load changes in the absorption capacity is slightly worse, high-speed operation noise. Belt drive is used to transmit power, sometimes also used to transport materials, parts of the whole series.
Second, reducer worm gear transmission characteristics
(i) Self-locking. When the helical rise angle of the worm is very small, the worm can only drive the worm wheel drive, and the worm wheel cannot drive the worm to rotate.
(ii) Worm gearing efficiency is low, generally considered to be lower than the efficiency of worm gearing gearing. Especially with self-locking worm gearing, its efficiency is below 0.5, and the general efficiency is only 0.7 to 0.9.
(c) High heat generation, easy wear of tooth surface and high cost.
(iv) Large transmission ratio and compact structure. Worm head with Z1, the number of worm gear teeth with Z2. From the transmission ratio formula I = Z2 / Z1 can be seen, when Z1 = 1, that is, the worm for the single head, the worm must be turned Z2 to turn the worm wheel to turn a turn, and thus can get a large transmission ratio, generally in the power transmission, take the ratio of I = 10-80; in the indexing mechanism, I up to 1,000. such a large transmission, such as the gear drive, you need to take a multi-stage transmission, so the worm drive compact structure, small size, light weight. Small size and light weight.
(v) Smooth transmission, no noise. Because the worm teeth are continuous and uninterrupted spiral teeth, it is continuous when it meshes with the worm gear teeth, the worm teeth do not have the process of entering and exiting the meshing, so the work is smooth, impact, vibration, noise is small.