1、附录一 Knowledge On The Bearings and Shaft The bearings are fixed and reduce the load coefficient of friction in the process of mechanical transmission components. Can also say that when the other parts on the shaft relative motion, used to reduce the friction coefficient in the process of power transf
2、er and fixed the mechanical parts to maintain the position of the shaft center. Bearings are important parts of modern machinery and equipment. Its main function is to support the mechanical rotating body to reduce the load coefficient of friction of the mechanical equipment in the transmission proc
3、ess. According to the different nature of friction of moving parts, bearings can be divided into two types of rolling bearings and plain bearings. Nano Lake, Italy, found a Roman vessel discovered early instance of ball bearings. The wooden ball bearings are used to support the rotating desktop. Shi
4、p construction in 40 BC. It is said that Leonardo da Vinci in the 1500 or so, a ball bearing through description. , There is a very important point is the ball collision, causing additional friction between the ball bearings of all kinds of immature factors. But can put the ball into a small cage to
5、 prevent this phenomenon. The 17th century, Galileo fixed ball , or cage ball ball bearings did the earliest description. But then quite a long time, the bearings have been installed on the machine. The first patent on the ball channel the Carmarthen Philip Vaughan in 1794. In 1883, Friedrich Fische
6、r proposed the idea of the use of suitable production machine grinding the same size, roundness accurate ball. This laid the foundation to create an independent bearing industry. In 1962, FAG the trademark has been modified and are still used today and become an integral part of the company in 1979.
7、 In 1895, Henry Timken designed the first tapered roller bearings, three years later obtained a patent and the establishment of the Timken Company. In 1907, SKF bearing factory Sven temperature Qwest designed the first modern self-aligning ball bearings. Study its role should be in terms of support,
8、 that the literal interpretation is used to bearing axis, but this is only part of its role in supporting its essence is to be able to bear the radial load. Can also be understood that it is used to a fixed axis. A fixed axis so that it can only achieve rotation, and control of axial and radial move
9、ment. Motor without bearing the consequences is not work at all. Because the axis may be in any direction movement, the motor work requirements shaft only rotation. Impossible to realize the role of the drive, in theory, not only that, bearing also affect the transmission must be achieved in order t
10、o reduce this effect in the high speed shaft bearing lubrication, and some bearing lubrication, called pre-lubricated bearings, and the most of the bearing lubricant, the load at high speeds, due to the friction will not only increase energy consumption, even worse, is very easy to damage the bearin
11、g. Sliding friction into rolling friction is one-sided to say things because of the kind called plain bearings. Bearing the classification and described as follows: Equipped with a thin and long roller needle bearing (the length of the roller diameter of 3 to 10 times the diameter of generally not m
12、ore than 5mm), therefore the radial structure is compact, its inner diameter and load capacity with other types of bearing the same minimum outside diameter, especially for supporting the results of radial installation dimensions restricted. needle bearing according to the use of different occasions
13、, can be used without inner ring bearings or needle roller and cage assembly and bearing to match the journal surface directly as a bearing surface and shell holes, outer rolling surface in order to ensure the load capacity and running performance with a ring bearing the same shaft or shell holes on
14、 the raceway surface of the hardness, the machining accuracy and surface quality should be the bearing rings. use Combined needle roller bearings to the heart needle roller bearings and thrust bearing parts bearing units of the combination of its compact size, small, high precision rotation, can wit
15、hstand high radial load to bear certain axial load. And the product structure in various forms, wide adaptability, easy to install. Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery, printing machinery and other machinery and equipment, and
16、make the mechanical system design is very compact and nimble. Aligning ball bearings Self-aligning ball bearings: two of the inner ring raceway and the raceway between the spherical outer ring, the assembly of the drum-shaped roller bearing. The outer ring raceway curvature center and bearing center
17、 line, and therefore have the same aligning and self-aligning ball bearings. Axis, the shell deflection occurs, you can automatically adjust to not increase the burden of bearing. Spherical roller bearings can bear radial load and axial load in two directions. Aligning ball bearing radial load capac
18、ity, suitable for a heavy impact load conditions. The inner diameter is tapered bore bearings can be installed directly. Or use the adapter sleeve, remove the tube installed in the cylinder axis. Cage the use of steel stamping cage, forming polyamide-aligning ball bearings withstand heavy loads and
19、impact loads, precision instruments, low noise motors, automobiles, motorcycles, metallurgy, mill, mining, petroleum, paper, cement, pressed sugar industry and the general machinery. Deep groove ball bearings imported bearings are mainly used for pure radial load, both radial and axial load. Only un
20、der pure radial load, the contact angle is zero. Performance of angular contact bearings, deep groove ball bearings with a larger radial clearance, and is subjected to high axial load. Deep groove ball bearings, the friction coefficient is small, the limit speed is also high, especially in a large h
21、igh-speed operation of the axial load conditions, deep groove ball bearings Thrust ball bearings are more advantages. Deep groove ball bearings are the most representative of the rolling bearings, widely used. For high speed or high speed operation, and is very durable, without regular maintenance.
22、The class has a small coefficient of friction, high limiting speed, simple structure, low manufacturing cost, easy to achieve high manufacturing precision. Size range and diversity, changes in the form used in precision instruments, low noise motors, automobiles, motorcycles and general machinery an
23、d other industries, is the machinery industrys most widely used type of bearings. The main radial load, and can withstand a certain amount of axial load deep groove ball bearings can be used for the transmission, instrumentation, motors, appliances, internal combustion engines, transportation vehicl
24、es, agricultural machinery, construction machinery, construction machinery and so on. Aligning roller bearing is a spherical outer ring between the two raceways of the inner ring raceway assembly with drum-shaped roller bearings. Aligning roller bearing with two rollers, mainly exposed to the diamet
25、er of a load, but also able to withstand the axial load in either direction. High radial load capacity, especially suitable for work overload or vibration loads, but can not afford the pure axial load. This kind of bearing outer ring raceway is spherical shape, aligning performance is good, can comp
26、ensate concentricity error. Spherical roller bearings have two symmetrical spherical roller outer ring of a common spherical raceway, two bearing axis of inner ring tilt angle of the raceway, has a good aligning properties, when the axis force bearing when bending or install a different heart to continue its normal use, tune concentric with the bearing dimension series vary, generally allow aligning angle of 2.5 degrees, the type of load
