Bearings With Inner Sleeve Supports the mechanical rotary body
Bearing is an important part of modern machinery. Its main function is to support the mechanical rotary body, reduce the friction coefficient of its motion, and guarantee its accuracy.
The bearing can be divided into two types: rolling bearing and sliding bearing, according to the friction material of the motion element. The rolling bearing has been standardized and serialized, but it has a large radial dimension, vibration and noise compared to sliding bearings, and the price is higher.
Rolling bearings generally consists of outer ring, inner ring, rolling body and keep the frame of four parts, strict, the outer ring, inner ring, rolling body, cage, sealing, lubricating oil of six parts. Simply put, as long as you have outer circles, inner circles, and scrollers can be defined as rolling bearings. The rolling bearings are divided into ball bearings and roller bearings in the shape of the rolling body.
In the early form of linear motion bearings, a row of wooden poles were placed under a row of pry plates. Modern linear motion bearings use the same principle of work, but sometimes use a ball instead of a roller. The simplest rotating bearing is the shaft bearing, which is a bushing between the wheel and the wheel shaft. The design is then replaced by a rolling bearing, which replaces the original liner with a lot of cylindrical rollers, each like a single wheel.
Nanoscale lake in Italy found a ship built in 40 years BC in ancient Rome, was found early examples of ball bearing: a wooden ball bearing is used to support the rotary table. Leonardo Da Vinci was said to have described a ball bearing around 1500. One of the important things about ball bearings is that there is a collision between the balls, causing additional friction. But you can prevent it by putting the ball in a small cage. In the 17th century, Galileo first described the ball bearing of the cage ball. At the end of the 17th century, British c. warlow designed and manufactured ball bearings, which were tested in a mail cart and patented by Britain's p. worth. One of the earliest and most useful rolling bearings was the clockmaker John harry, who was invented for the H3 chronometer in 1760. At the end of the 18th century, H.R. Hertz of Germany published a paper on the stress of ball bearings. In Hertz achievement, on the basis of Germany's r. a. terry baker, Sweden PAM glen and others A lot of tests have been carried out, to develop the design of the rolling bearing theory and fatigue life calculation. Then the Russian N.P. petrov applied Newton's law of viscosity to calculate the friction of the bearing. The first patent for the ball channel was awarded by Philip vaughn in 1794.