Bearing rotational friction accuracy

2020-07-31 20:24:06

product presentation

What is Bearing Bearing (Bearing) is a kind of important modern machinery and equipment parts of its main function is to support the mechanical body of revolution, reduce the coefficient of friction in the process of movement (friction coefficient), and ensure its rotary precision (accuracy) Bearing classification by the frictional properties of motion elements is different, the Bearing can be divided into two categories, the rolling Bearing and sliding Bearing of rolling Bearing has been standardized seriation, but compared with sliding Bearing its radial vibration and noise is bigger size, the price also is higher

According to the stress state of motion components, bearing can be divided into the centripetal bearing thrust bearing and angular contact bearings three types of general by the outer ring rolling bearing of rolling bearing inner ring rolling element and cage of four parts, strict, the outer ring inner ring roller cage sealing grease six pieces of simple, as long as you are inside the outer circle rolling element can be defined as the shape of the rolling bearing press roller, roller bearing divided into two major categories of ball bearings and roller bearings, deep groove ball bearing

Deep groove ball bearings mainly take radial load, also can bear radial load and axial load at the same time when the only bear radial load, the contact Angle is zero when the deep groove ball bearing with large radial clearance, with the performance of the angular contact bearings can withstand large axial load, deep groove ball bearing friction coefficient is small, high limit speed also deep groove ball bearing is the most representative of the rolling bearing, the purpose is widely used in high speed and high speed running, and very durable, need not often maintenance these bearing small friction coefficient, high limit speed, simple structure, low manufacture cost, easy to achieve high manufacture precision

Size range and variety in form, the application in the precision instrument low noise motor cars motorcycles and general machinery and other industries, is the most widely used type of bearings in machinery industry, mainly bear radial load, also can withstand a certain amount of axial load deep groove ball bearing manufacturing process of thrust ball bearing thrust ball bearing adopts high speed motion can inherit the design of the thrust load, when the washer with a ball rolling roll gap shape ring form due to the race for the seat cushion, thus, thrust ball bearing is divided into a flat base mat type and self-aligning spherical seat cushion type two kinds

In addition, this kind of bearings can withstand axial load, but can't bear radial load thrust ball bearing shaft by the seat ring ring and ball cage components with three parts on the shaft of said axial circle, cooperate with the shell of the said seat side thrust ball bearing is only applicable to bear axial load speed on the lower part, such as crane hook vertical vertical centrifuge pump jacks, such as low speed reducer bearing axial circle are separate from the race and rolling elements, can be respectively cylindrical roller bearing cylindrical roller bearing roller installation is a centripetal roller bearing cylindrical roller

Cylindrical roller and race for line contact bearing load capacity is big, mainly bear radial load and roller ring guard friction small, suitable for high speed rotation according to the ring with or without rim, can divide a NU NJ NUP N NF single bearing, and NNU NN etc. Double row bearing inner ring or outer rim of cylindrical roller bearing, which can ring and outer ring to relative axial movement, so it can be used as a free end bearing inner ring and outer ring of one side of two guard, on the other side of the ring has a single guard cylindrical roller bearing, can withstand a certain degree of axial load in one direction

Generally use stamping steel cage, or copper alloy car entities cage but there are also part of the use of polyamide forming keep frame of sliding bearing sliding bearing (slidingbearing) work under sliding friction bearing sliding bearing work stable and reliable, no noise in fluid lubrication condition, the sliding surface is lubricating oil without direct contact, also can greatly reduce the friction loss and wear of surface oil film also has a certain vibration absorbing ability but starting frictional resistance larger shaft bearing parts called journal, and shaft neck matching parts called bush

In order to improve the bearing surface of the friction properties and in them on the surface of cast anti-friction material layer is called the bearing bush bearing and the bearing bush of the material are collectively referred to as sliding bearing sliding bearing applications generally in low speed under the condition of light load or intermittent work condition (sliding bearing) but starting frictional resistance the bearing parts of the large shaft are called the journal, and shaft neck matching parts called bearing shell in order to improve the bearing surface of the friction properties and in them on the surface of cast anti-friction material layer is called the bearing bush bearing and the bearing bush of the material are collectively referred to as sliding bearing sliding bearing applications generally in low speed

Principle of Bearing selection under working conditions of light load or intermittent operation 

(1) To master the working conditions of mechanical devices and bearings, etc.

(2) to clarify the requirements for bearings 

(3) to select the type of bearings 

(4) to select the bearing configuration 

(5) to select the bearing size 

(6) to select the bearing specification 

(7) to select the bearing installation method