Material bearing applications

Material bearing applications
Rings and rolling elements with material
Under normal circumstances, wheel precision bearing rolling with the overall hardening carbon chromium bearing steel. Grades or GCr15SiMn GCr15 steel; turntable bearing ring surface hardened steel is used, when the user no special requirements, generally used 50Mn steel, but sometimes in order to meet the needs of some of the special applications of the host, but also according to the user's selection of specific conditions of use of other brands of hardened steel surface.

Cage materials
Wheel bearings with cage integral structural form, segmented, such as isolation block. Which monolithic and segmented cage with 20 steel or ZL102 cast aluminum alloy. 1010 block isolation polyamide resin, ZL102 aluminum casting and other manufacturing. In recent years, with the development of industrial materials are nylon GRPA66.25 segmented cage design to application.

Seal materials
Wheel Slewing bearing oil seal materials used with NBR rubber. Rings and blank material supply status code as defined in Table, the table, "T", said ferrule blank as quenched state supply, "Z", said ferrule blank to normalizing the status of supplies.

Application of bearings

Application of bearings
Wheel bearings can withstand a large axial load, radial load and overturning moment, such as integrated load durability tester sets, large bearings rotate, transmission, fixed and other functions in a special structure. Under normal circumstances, all with their own turntable bearing mounting holes, lubricants and seals, to meet the different needs of a variety of different conditions of work under the conditions of the various types of hosts; on the other hand, wheel bearings itself with a compact, rotating guide convenient, easy to install and easy to maintain, etc., are widely used in material handling equipment, mining machines, construction machinery, port machinery, wind energy, medical equipment, radar and missile launchers and other large rotary device.

Slewing ring Profile

Slewing ring Profile
Slewing ring, is a comprehensive large Cross roller bearing to withstand load, can withstand large axial, radial load and overturning moment. Slewing ring bearings are generally installed with a hole in the gear or external gear, lubrication holes and sealing devices, which enable the host design compact guide is simple, easy to maintain. Slewing ring bearings with or without gear, external gear teeth and inside the four-point contact ball bearings, double row angular contact ball bearings Crossed cylindrical roller bearings, tapered roller bearings and cross three-row cylindrical roller bearings four composite series, four-point contact ball bearings with high static load capacity, crossed cylindrical roller has a high dynamic load capacity, cross-tapered roller bearings preloaded bearings with greater support to make rigid and rotary precision, three-row cylindrical roller journal bearing due to increased carrying capacity lead bearing height, various forces were borne by the different races, so the same force conditions, which can greatly reduce the diameter of the bearing, which has a more compact so that the host is characterized by a high-load capacity of slewing ring bearings. Slewing ring bearings are widely used for lifting machinery, mining machinery, construction machinery, port machinery, ship equipment and high-precision radar and missile launchers and other mechanical equipment of large rotary device. But also according to the user's specific requirements and design, development and production of special structures slewing ring bearings.

Clutch release bearing failure

Clutch release bearing failure
(1) Operating temperature is too high lead to overheating. Many drivers in turning or deceleration, often half-pedal clutch, some Guadang rear foot on the clutch pedal also; Some vehicles free travel adjustment is too large, making the clutch is not complete, in a semi-bonding, semi-isolated state, this causing the state of the friction generated between the sliding friction plate and flywheel, a large amount of heat transmitted to the angular contact ball bearing, the bearing is heated to a certain temperature, the melted grease or diluted flow, the temperature of the bearing to further improve the separation, when the temperature reaches a certain degree will burn bad release bearing.
(2) the lack of grease and abrasion. Clutch release bearings with grease lubrication. Repair personnel in practical work release bearing lubrication problem is easy to ignore, and do not release bearing lubrication during installation, causing the clutch release bearing starvation. No lubrication or less the amount of wear of bearings lubricated separate release bearing lubrication is often several times to several times. Wear increases, the temperature will increase greatly, so more damage to the release bearing. So in the repair process, the installation of the clutch release bearing lubrication to check, timely lubrication maintenance.
(3) free travel is too small or subject to excessive load times. Upon request, the general clutch lever clearance between the Ceramic Ball Bearings and the separation of 2.5mm more appropriate to reflect on the clutch pedal free travel for 30 ~ 40mm, free travel is too small or no free travel, will make the separation lever and separation bearing in a normally engaged state. According to the principle of fatigue damage, bearing work longer, more serious damage; load times by the more, the more easily separated bearing fatigue damage. And the longer working hours, the higher the temperature of the bearing, the easier burning, reduce separation bearing life.

Bearing history

Bearing history：
In the seventeenth century, the British design and manufacturing ball bearings C. Vallo, and installed in the car to try and British postal P. Wirth made ball bearings patent. Eighteenth century German publication on ball bearings HR Hertz contact stress papers. On the basis of the achievements of the Hertz, Germany, Sweden, Glenn A. Pam, who have done a lot of testing, the design theory and the development of fatigue life of rolling bearings is calculated to make a contribution. Subsequently, the Russian Petrov NP Newton's law to calculate the viscous friction bearings. British Thor O. Renault were found mathematical analysis, Reynolds equation is derived, from the foundation hydrodynamic lubrication theory. The early form of linear motion bearings, is placed in a row in a row of wooden sled. This technique might be traced back to the time of the construction of the Great Pyramid of Giza, although there is no clear evidence. Modern linear motion bearings using the same kind of works, but sometimes with the ball instead of rollers. The first sliding and rolling element bearings are made of wood. Ceramic, sapphire or glass are also used, steel, copper, other metals, plastics  have been widely used. From the heavy-duty vehicle axle and spindle to precision watch parts, many occasions require rotating bearings. The easiest is rotating bearing sleeve turbocharger bearings, it's just a clip in the bush between the wheels and axles. This design is then Rolling alternative is to use a lot of cylindrical roller bushings replace the original, each rolling element as a single wheel. Rolling with the earliest practical input cage is clockmaker John Harrison in 1760 for the production of H3 timing meter invention. Aboard a Roman ship found in the Italian lake nm, found examples of early ball bearings. The wooden ball bearings are used to support rotating desktop. The ship was built in 40 BC. It is said that Leonardo da Vinci around 1500 had been to a ball bearing is described. Ball bearings of various immature factors, there is a very important point is that a collision will occur between the ball, causing additional friction. But you can put the ball into a small cage to prevent this phenomenon. 17th century, Galileo "fixed ball" or "caged ball" ball bearing did the earliest descriptions. But then for a long time, install the sealed angular contact ball bearing has not been achieved on the machine. The first patent on ball channel is Carmarthen Philip Vaughan in 1794 obtained. In 1883, Friedrich Fischer proposed the use of appropriate production grinding machine of the same size, roundness accurate idea of the ball. This laid the foundation for the creation of an independent industrial bearings.