产品参数
商品编号: | 110003619 | 品牌: | NETMALL |
产品类别: | Needle Roller Bearing | 产品重量:(g) | 10.00 |
轴承型号: | K15*21*12 | 产品颜色: | Natural color |
等同其它型号: | 使用特性: | ||
外形尺寸-内径d:(mm) | 15 | 外形尺寸-外径D:(mm) | 21 |
外形尺寸-宽度B:(mm) | 外形尺寸-内圈高度:(mm) | ||
外形尺寸-外圈高度:(mm) | 12 | 轴承材料-轴承外圈材料: | Other |
振动等级: | 轴承材料-轴承内圈材料: | ||
滚道类型: | 轴承材料-滚动体材料: | GCr15 | |
密封方式: | OPEN | 轴承材料-保持架材料: | Other |
轴承精度等级: | 轴承材料-密封件材料: | ||
内部游隙: | 基本额定载荷-动载荷:(KN) | 10KN | |
润滑剂类型: | 基本额定载荷-静载荷:(KN) | 13KN | |
极限转速-脂润滑:(r/min) | 极限转速-油润滑:(r/min) |
产品特性
Load bearing capacity, compact structure, suitable for radial or axial mounting dimensions restricted occasions, low speed, poor precision rotation应用领域
kinds of areas of textile machinery, printing machinery, tobacco machinery, engineering machinery, sewing machinery, packaging machinery, office equipment, household appliances, mining machinery, as well as motorcycles, cars and other vehicles and logistics machinery, power tools, etc.商品详情
Needle roller bearings (needle bearing) is a long belt roller cylindrical roller bearings , relative to its diameter , roller both thin and long. This is called needle roller . Despite having a smaller cross-section , has a higher load bearing capacity, and long thin needle bearing mounted roller ( roller diameter D ≤ 5mm, L / D ≥ 2.5, L is the length of the roller ) , therefore compact, especially suitable for mounting dimensions restricted occasions.
Many types of needle roller bearings , according to the main structure can be divided into :
First, radial needle roller bearings , including: open Needle roller bearings , enclosed Needle roller bearings , needle roller bearings without outer ring , needle roller bearings without inner ring / no cage without inner needle bearing , cage or no cage filled with needle roller bearings , needle roller cage assemblies , needle roller bearings without ribs , with or without sealing sealing needle roller bearings , needle roller bearings double or more columns , solid rings needle roller bearings, etc.
Second, the thrust needle roller bearings: Needle roller thrust bearings by the band or long thrust cylindrical roller cage assemblies and thrust washers components. Needle and cylindrical roller thrust being to maintain and keep the guide frame . When used with a different series of thrust bearing washers may provide many different combinations of the bearing configuration. As the use of precision cylindrical rollers ( needle ) to increase the contact length so that the bearing load capacity and high availability of high stiffness with a very small space. Another advantage is that the parts can be omitted if the adjacent raceway surface suitable for gaskets, make compact, cylindrical and needle roller thrust cylindrical roller bearings and needle roller thrust cylindrical roller bearings for surface modification can reduce the edge stress , improve life.
Third, the needle bearings : including thrust needle roller / ball bearings 5 , radial needle roller / thrust ball bearings 6 , needle roller / cylindrical roller thrust bearings, needle roller bearings and a variety of :
STO outer wall with the inner wheel bearing , RNA22 ... 2RS double sealed , no inner wheel bearing
NA22 ... 2RS double sealed with inner wheel bearing , NATR ... PP flat ring axial guide bearing needle roller bearings , NATV ... PP flat ring roller bearing axial guidance , full needle , NUTR rolling element bearing roller guide , full roller type
CRY inch flat ring roller bearing axial guidance
Needle roller bearings to the heart of a typical type needle bearing is a thin metal forming the outer ring needle roller bearings. Its main feature is the low section height and ability to withstand high loads . Mainly used for compact, inexpensive and needle bearings inside the hole can not be used as cage assembly raceway bearing configuration. Bearings and bearing housings shall be mounted with an interference fit . If you can save me shoulder axial positioning stopper ring and other functions , then the bearings inside the hole can be both simple and economical.
Mounted on the shaft of the Needle roller bearings with bilateral and unilateral open closed . Drawn cup base closure can withstand a small axial end surface guiding force . Needle roller bearings are generally not attached to the inner ring . In the journal of the occasion can not be hardened and ground Needle roller bearings and hardened steel outer ring needle roller cage assemblies can not be separated . Lubricant storage free space can be extended relubrication intervals . Bearings generally use single design . With the exception of wide specifications bearing 1522,1622,2030,2538 and 3038 series, which is equipped with two needle roller cage assemblies . Bearing outer ring with lubrication holes. According to user needs , shaft diameter greater than or equal to all the single 7mm Needle roller bearings can be equipped with an outer ring with lubrication holes ( code suffix AS1). Needle roller bearings with seals : the seal can not be installed due to space constraints of the occasion , providing an open -ended or closed -ended Needle roller bearings with seals . These bearings are equipped with polyurethane or synthetic rubber friction seal, which lithium-based grease filled with good rust resistance , suitable for operating temperatures from -20 to +120 ℃. A seal bearing inner ring is wider than the outer 1mm, this makes the bearing shaft relative displacement of the bearing box with a little work it could ensure good seal and prevent injury to the bearing contamination. There lubricated bearing inner hole of the bearing arrangement according to need , supplemented by the outer or inner ring lubrication .
Needle roller bearings installed
Install needle bearing , which is usually carried out using an auxiliary sleeve . At this time, the auxiliary roller or auxiliary needle sleeve not to hold the needle fell out , with its own journal chamfered off the needle , with needle bearing in the journal slowly move to the inside , the auxiliary roll or auxiliary sleeve will slowly withdraw until loaded into working position.
Auxiliary roller , the auxiliary sleeve is smaller in diameter than the shaft outside diameter of 0.1-0.3mm. When installed, the first bearing outer ring surface coated with grease , put the needle surface mount within close together ( the last one into the gap left when the needle ) , then replace the journal or the auxiliary roller bearing inner ring or auxiliary push the outer sleeve hole and align it to install the shaft end face or surface mounted on the shaft end face of the bearing inner ring , then press or hand with a hammer to exert pressure .
Needle roller bearings also can be installed and will be coated with a thin layer of the outer diameter of the sleeve auxiliary lubricant , set into the bearing outer ring , the auxiliary bearing outer sleeve and form a circular hole , and then installed with needle holes in the ring . After Bahrain needle , will assist with the work of the shaft sleeve can be launched .
For no inner or outer ring needle roller bearings without , at the time of installation, you can simply scroll through the shaft or housing bore surface coated with a thin layer of grease and turn the needle close to the site of the installation of grease . Needle placement should be the last one to leave a gap , a gap the size of the circumference of the needle bearings to 0.5mm appropriate. Finally, one can not put a hard squeeze put the needle , a needle or less loaded because when mounted hard squeeze , bearing will be stuck not rotate ; less loaded when the gap is too large, easily lead to needle bearing operation occurs wiggler and broken. For only drawn cup needle roller bearings , as the outer walls were very thin , do not hand hammer installation, you should use the push press . Because the hand hammer , uneven pressure , tends to produce needle bearing outer ring local deformation . Preliminary determination quality needle roller bearings :
1 , the packaging is clear : Under normal circumstances, the regular manufacturers brand has its own dedicated design staff outside packaging design, production conditions and arrangements for clearance of the factory production of production, therefore , in terms of product packaging lines to color should be very clear and unambiguous .
2 , the font tag is clear : Every product bearing products bearing the body will be in the printed words of its brand , label and so on. Although the font is very small, but regular manufacturers of products using the technology stenciled lettering, but before the heat-treatment is carried out without the word pressure , so the font was small, but a deep concave , very clear. And usually, not only the fuzzy font counterfeit products , the printing technology roughness font floating on the surface , and some can be easily wiped off by hand or manually trace serious.
3 , if there is abnormal sound : left hand holding the bearing sleeve body , right hand toggle coat a small margin to rotate back and forth , listening to the bearings during operation whether hetero ring. Most counterfeit products due to production conditions behind , completely hand- mill operation , bearing the body in the production process will inevitably be distracted by dust , sand, a class of impurities , so it will be rotating bearing ring or hybrid phenomenon is not running smoothly . This is to determine whether the product by strict production standards , and the key with the regular operation of the machine manufacturer's brand products.
4 , if there is muddy surface traces of oil : Are there muddy surface traces of oil should pay special attention when buying bearings. It is easy to leave a thick smears Because there is a certain gap between domestic and foreign advanced technology of rust country of manufacture , so the bearings rust treatment , sticky feeling when touch the sticky thick , and foreign imported bearing on the rust hardly see any traces of oil . According to insiders , particularly careful person can smell the bearings to a special flavor , which is anti-rust oil taste.
5 , chamfering is uniform : the so-called bearing chamfer , which is the junction with the vertical plane of the horizontal plane , bearing counterfeit products due to restrictions on production technology , in which the corners of the site was unsatisfactory treatment , which is we can easily identify .
6 , bearing packaging : Packaging fair share of packaging and packaging. Bearing in manufacturing finished and after passing inspection , the cleaning and anti-rust treatment , then put the package in order to achieve waterproof, moisture , dust, shock , maintaining quality and precision bearings as well as ease of use and sale purposes . Bearing inner packing by rust period is divided into three categories:
① short- term rust packaging : rust of 3 to 6 months , suitable for large -volume shipments to the same subscribers, will be put into use in the short term bearing . By mutual agreement , to facilitate the use of the principle , the use of simple packaging .
② general rust of packaging : rust period of one year for general purpose bearing .
③ long rust-proof packaging : rust of two years for special and precision bearings.
Bearing polyethylene plastic tube packaging materials ( boxes ) , kraft paper, plain and wrinkles polyethylene composite paper, cardboard , plastic film , polyethylene or polyethylene , nylon or plastic fastening belt fastening tape , high strength plastic tape , linen bags. The above materials are required to ensure that the corrosion resistance of the material can test pass.