What are the characteristics of needle roller bearings
There are many types of bearings, different bearings have different characteristics, what are the characteristics of needle roller bearings? Can accept higher radial load, higher speed, cannot accept axial load, higher rigidity.
Needle roller generalized surface at the near end face slightly shortened. Needle roller and raceway line touch the results of the batch can needle roller bearings, to prevent the occurrence of destructive marginal stress. Support roller needle roller bearing system thick-walled outer ring, high temperature high nitrogen quenching, high precision sorting of the roller by the high rigidity of the outer ring retaining edge guidance, the use of linear touch, the roller can be directly in the raceway easy transformation, and can accept the magnificent load. In order to remove the stress, the outer ring of the supporting roller is chosen to depict the curved surface, and the curved roller has various specification models with single, double seal ring, without seal ring, with seal ring, etc.
Needle roller bearing is equipped with thin and long roller, roller length for the diameter of three to ten times, the diameter is usually not more than 5mm, so the radial layout is compact, its inner diameter scale and load capacity and other types of bearings, the outer diameter of the most. According to the use of different occasions, can choose no inner ring bearings or needle roller and cage assembly, at this moment and bearing general with the journal appearance and shell hole appearance directly as the bearing of the inner and outer rolling surface, in order to ensure the load capacity and work performance with the sleeve bearing, shaft or shell hole raceway appearance of hardness, processing accuracy and appearance quality should be similar to the bearing sleeve raceway. This kind of bearing can only accept radial load.
Needle roller bearing types, in addition to the type catalog listed, can be used in the usual engineering bearings, such as: open type drawn outer ring needle roller bearings. Needle roller bearings with and without cage filled, closed drawn cup needle roller bearings, and needle roller bearings without inner ring/without inner ring without cage, needle roller bearings with inner ring, SKF can also supply various types of needle roller bearings.
Needle Roller Bearings without Retaining Ring, Combined Needle Roller/Ball Bearings, Needle Roller Cage Assemblies, Self-aligning Needle Roller Bearings, Combined Needle Roller/Thrust Ball Bearings. Combined needle roller/cylindrical roller thrust bearings, Drawn cup needle roller bearings. Drawn cup needle roller bearings are needle roller bearings with thin drawn outer ring. The main feature is the low cross-sectional height and high load acceptance capacity. Mainly used for compact layout, cheap and bearing box bore can not be used as needle roller cage assembly raceway bearing equipment.
Combined needle roller bearing is a combination of radial needle roller bearing and thrust bearing components bearing unit, its layout compact volume. And the product layout in various forms, adaptability, easy to install. Combined needle roller bearings are widely used in various mechanical equipment such as machine tools, metallurgical machinery, textile machinery and printing machinery, and can make the mechanical system depicted very compact and flexible.
Bearing retainer, also known as bearing cage, is one of the main parts of the bearing. Its role is to wrap and isolate the rolling body and move with it, and usually also has the role of guiding the rolling body. The cage is subjected to stresses caused by friction, strain and inertia forces, and also to the chemically corrosive effects of lubricants, additives in lubricants or substances due to their aging, organic solvents or coolants. Therefore, the design and material of the cage are extremely important for its performance and the reliability of the bearing.
Rolling bearings in the process of use due to its own quality and external conditions, its bearing capacity, rotational accuracy and friction reduction performance will change, when the performance index of the bearing is lower than the use of the requirements and can not work properly, there will be machinery and equipment to stop running, the function of damage and other abnormal phenomena. If effective maintenance procedures are taken in bearing mounting and dismounting, lubrication, pollution prevention and personnel training, online inspection and timely troubleshooting, the above failures can be avoided. Bearing mounting and dismounting should pay attention to the use of appropriate tools and methods Bearing mounting is a strict maintenance work, the good or bad mounting, directly affect the accuracy, life and performance of the bearing.
Of course there is lubricant inside the wheel bearings of a car, but it is a low-fluidity grease (yellow dry oil). Of course the wheel bearings of a car can break down, but when they do, they can simply be replaced with new bearings. Relatively speaking, the rolling bearings used in small non-load machinery are maintenance-free for life, which is different from the sliding bearings that are often changed.
Rolling bearings show a strong regularity in their use, and repeatability is very good. Normal high-quality bearings (rolling bearings) in the beginning of use, vibration and noise are relatively small, but the spectrum is somewhat scattered, the amplitude are small, may be due to some defects in the manufacturing process, such as surface burrs, etc..
Rolling bearing is an important mechanical components, a mechanical equipment whether the function can give full play to the bearing smooth can be appropriate, smooth is to ensure the normal operation of the bearing necessary conditions, it is on the progress of bearing bearing bearing capacity and use of life plays an important role. No matter what kind of smooth method is used, smooth in the rolling bearing can play the following kinds of effect.
Suzhou Dongwu Needle Roller Bearing Co., Ltd. is located in Suzhou Industrial Park, adjacent to Wusong River and airport road in the south, national highway 312 and Shanghai Nanjing Expressway in the north, with superior geographical location and convenient transportation.