Mechanical transmission is usually referred to as the rotary motion of the meshing drive and friction drive.
Mechanical transmission is divided into friction transmission and meshing transmission.
Friction drive which includes: direct contact transmission (friction wheel drive) and the use of intermediate flexible parts of the drive (belt drive) two parts.
Engagement drive inside includes: direct contact transmission (gear drive, worm drive) and the use of intermediate flexible parts of the drive (chain drive) two parts.
The purpose of mechanical transmission is to coordinate the working part of the speed relationship with the prime mover to achieve the requirements of deceleration, speed and speed, to achieve the force or torque changes.
1. The belt drive is composed of a driving wheel, a driven wheel and a belt.
Features: with a soft drive, can buffer, vibration, smooth transmission, no noise. Overload when the slip, to prevent damage to parts, play a role in security, but can not guarantee the accuracy of the transmission ratio. The structure is relatively simple and easy to manufacture, low cost, suitable for the two-axis center from the relatively large occasions, because the outer contour size, transmission efficiency is low. Belt drive is divided into (open, cross, semi-cross).
Used for mining machinery, chemical machinery, transportation machinery, agricultural machinery.
2. Chain drive is through a special active sprocket and power transmission to a special gear with a driven sprocket of a transmission.
Advantages: Compared with the belt drive, the chain drive inelastic sliding and slipping phenomenon, the average transmission ratio is accurate, reliable, high efficiency; transmission power, anti-overload ability, the same conditions of transmission size is small; On the small pressure; in high temperature, dusty, polluted harsh conditions to work.
Disadvantages: chain drive can only be used for parallel shaft drive between the high cost, easy to wear, poor transmission stability,
3. Gear drive refers to the main and driven wheel teeth directly to the movement and movement of the device. The gears are the most widely used in all transmissions.
Features: ① to ensure that the instantaneous transmission ratio of the constant, relatively high stability, accurate transmission of the
by.
② transmission of power and speed range is relatively large.
③ compact structure, reliable, can achieve a larger transmission ratio.
④ high transmission efficiency, long service life.
⑤ gear manufacturing, installation requirements are relatively high.
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