組合滾針軸承
 
  FYB—組合滾針軸承是由向心滾針軸承和推力軸承部件組合的軸承單元,其結構緊湊 體積小,旋轉精度高,可 在承受很高徑向負荷同時承受一定的軸向負荷。并且產品結構形式多樣、適應性廣、易于安裝。FYB—組合滾針軸承使用在配合軸設計為軸承滾道處,或配本公司專門生產的IR標準 圈進行鑲套處理,其結構將更加緊湊。廣泛用于機床、冶金機械、紡織機械和印刷 機械等各種機械設備,并可使機械系統設計的十分緊湊靈巧。

△結構形式
  該類軸承有向心滾針與推力滿裝球、或與推力球、或與推力圓柱滾子、或與角接觸球組合為一體,可承受單向或雙向軸向載荷。也可根據用戶特殊結構要求設計。

△產品精度
  尺寸公差和幾何精度按JB/T8877。
  滾針直徑相互差在2μm,精度等級為G2級(國標GB/T309)。
  無內圈軸承裝配前內切圓直徑符合公差等級F6。
  軸承徑向游隙符合GB/T4604的0組規定值。
  特殊精度等級按GB/T307.1。
  對于軸承游隙、內切圓、精度等級特殊要求的詳細情況應與本公司聯系。

△材料

  滾針材料為GCr15軸承鋼,淬硬HRC60—65。
  內外圈材料為GCr15軸承鋼,淬硬HRC61—65。
  保持架材料為優質低碳鋼或增強尼龍。

△特殊說明
  NKIA、NKIB系列軸承軸向載荷不得超過徑向載荷的25%。
  用于交變軸向載荷的支承場合必須對置安裝。
  推力軸承部件必須施加達軸向基本額定靜載荷1%的預載荷。
  使用塑料保持架時(后綴TN)連續工作不得超過運轉溫度+120℃。
  推力軸承部件在軸承座中應自由活動。
  軸承一般配置設計見滾動軸承應用技術中相關推薦。

△標準
  GB/T6643—1996滾動軸承 滾針和推力圓柱滾子組合軸承 外形尺寸(GB-11)
  JB/T3122—1991滾動軸承 滾針軸承和推力球組合軸承 外形尺寸(JB-1)
  JB/T3123—1991滾動軸承 滾針軸承和角接觸球組合軸承 外形尺寸(JB-1)
  JB/T6644—1993滾動軸承 滾針和雙向推力圓柱滾子組合軸承尺寸和公差(JB-3)
  JB/T8877—2001滾動軸承 滾針組合軸承 技術條件(JB-12)
Combined Needle Roller Bearing

FYB---combined needle roller bearing is a bearing unit composed of radial needle roller bearing and thrust bearing parts. It features compact structure, small size and high rotating accuracy and bearing certain axial load while holding very high radial load, and multiple structure styles, broad adaptability and easy installation. It is widely used in lathe, metallurgical, textile and printing machinery.

FYB---combined needle roller bearing can be more compact in structure when it is used in auxiliary shafts designed as bearing raceway, or when it is inlayed with IR standard rings specially made by this company. This product can make the design of machine system highly compact and nimble.

Types of Designs:
This kind of bearing is a combination unit between radial needle rollers and full-component thrust balls, thrust cylindrical rollers or otherwise angular contact balls. It can bear one-way or two-way axial load. Special structure can be designed as well according to the requirements of customers.

Product Precision Accuracy:
Dimensional tolerance and geometrical accuracy is based on JB/T8877.
Mutual difference of needle roller diameter is 2μm, and the precision grade is G2 (ISO GB309).
The diameter of inscribed circle conforms to tolerance grade F6 before the fitting of outer ring with cage and roller assembly.

Bearing radial running clearance conforms to the value defined by 0 group of GB/T4604.
Special accuracy grade is based on GB/T307.1
For fuller information on the special requirements of bearing running clearance, inscribed circle and accuracy grade, please contact this company.

Materials:
Material for needle roller is GCr15 bearing steel, quench-hardening HRC60---65.
Material for inner and outer races is GCr15 bearing steel, quench-hardening HRC61---65.
Material for cages is quality low-carbon steel or reinforced nylon.

Special Directions:
Axial load of NKIA, NKIB series of bearings is not allowed to exceed radial load by 25%.
Being used for supporting alternative radial load, it must be installed in opposition.
Thrust bearing parts must exert preload up to 1% of axial basic rated static-load.
When plastic cages are used (suffixed with TN), operating temperature is not allowed to surpass +120℃ during continuous work.

Thrust bearing parts can move freely in bearing bracket.
For general-disposition design of bearings, refer to the relevant recommendation in the applied technology of rolling bearings.