Structure and Features

Transcription

1 Structure and Features eedle Roller aes for General Usae are bearins which display excellent performance. eedle rollers with extremely small dimensional variations in diameter are incorporated and retained in their specially shaped caes with hih riidity and accuracy, which precisely uide the needle rollers. When combined with shafts and housin bores that are heat treated and accurately round as raceway surfaces, eedle Roller aes for General Usae are particularly useful in small spaces. In addition, since they are lihtweiht and have hih riidity as well as a lare lubricant holdin capacity, they can withstand severe operatin conditions such as hih speed rotation and shock loads, and they are used in a wide rane of applications. Structures of eedle Roller aes for General Usae ae eedle roller ae eedle roller 1 2

2 Types Accuracy Specifications of shaft and housin eedle Roller aes for General Usae are available in two types, with sinle row needle rollers and double row needle rollers. For applications such as crank shafts where these bearins are difficult to install, it is also possible to make split type bearins. If such bearins are required, please contact. For eedle Roller aes for Enine onnectin Rods ( EG and V EG), see pae. Identification umber The identification number of eedle Roller aes for General Usae consists of a model code, dimensions and any supplemental codes. The arranement examples are shown below. The diameter tolerances of needle rollers of eedle Roller aes for General Usae are classified by classification symbols shown in Table 1. If a classification symbol is not indicated in an identification number, the classification symbol "3" is applied. When two or more bearins are used in tandem arranement on the same shaft, it is necessary to select bearins of the same classification symbol to obtain an even load distribution. The tolerance of the cae width B c is Table 1 Diameter tolerances of needle rollers lassification symbol 3 B unit: μ m 2 3 H Tolerance of mean value of needle roller diameter For the raceways, a surface hardness of 5 64HR and a surface rouhness 0.2μmR a or less are desirable. However, when the operatin conditions are not severe, a surface rouhness 0.μmR a or less can be used. When the surface hardness is low, it is necessary to correct the by the hardness factor specified on pae A. Operatin temperature rane For synthetic resin caes, "" is added at the end of the identification number. The operatin temperature rane for eedle Roller aes for General Usae is However, the maximum allowable temperature for synthetic resin caes is +1, and when they are continuously operated, it is +0. Dw 2 3 Dw Fi.1 H Fi.2 Dw Dw Examples of identification number Example 1 Type of bearin ae width Model code Roller set bore diameter Roller set outside diameter Tolerance of mean value of roller (Refer to Table 1.) Dimensions Supplemental code 3 B 4 B 6 B B Fit Radial clearances of eedle Roller aes for General Usae are determined by the dimensional accuracy of the raceways and needle rollers. Table 2 shows the recoended fits for the operatin conditions. Table 2 Recoended fits of shaft to the housin bore diameter G6 Tolerance class of shaft Operatin conditions F w 6 F w > 6 Mountin The dimensions related to mountin of eedle Roller aes for General Usae are shown in Fis. 1 and 2. When mountin eedle Roller aes for General Usae, they are axially positioned by usin, for example, ir-clips for shaft and housin bore (WR and AR on pae L) as shown in Fis. 3, 4 and 5. For hih speed applications, a heat treated and round spacer is positioned between the cae and the cir-clip as shown in Fi. 5 so that the cae does not make direct contact with the cir-clip. In this case, the cir-clip is normally mounted on the nonrotatin side. Fi. 3 shows a mountin example in the case of outer rin rotation, and Fis. 4 and 5 show examples in the case of inner rin rotation. Fi.3 Example 2 Model code Dimensions Supplemental code When hih operatin accuracy is required. When shock loads and oscillatin motions are applied. For eneral use j5 h5 h5 5 Fi.4 Type of bearin Roller set bore diameter W 34 B4 When the temperature is hih, or mountin errors are lare. Remark When settin the required radial clearance accordin to the operatin conditions, the clearance can easily be obtained by selectin and matchin the tolerances of needle rollers, shaft and housin bore. When variation of the clearance does not create any problems, h6 and G7 are used for shaft and housin bore, respectively. 6 f6 Roller set outside diameter ae width 34 Fi.5 Tolerance of mean value of roller (Refer to Table 1.) 3 1=0.2kf=0.4lbs. 1=0.039inch 4

3 EEDLE ROLLER AGES FOR GEERAL USAGE ote( 1 ) Remark speed applies to oil lubrication. For rease lubrication, a maximum of % of this value is allowable. For synthetic resin caes, "" is added at the end of the identification number. 5 1=0.2kf=0.4lbs. 1=0.039inch 6

4 EEDLE ROLLER AGES FOR GEERAL USAGE ote( 1 ) speed applies to oil lubrication. For rease lubrication, a maximum of % of this value is allowable. 7 1=0.2kf=0.4lbs. 1=0.039inch

5 EEDLE ROLLER AGES FOR GEERAL USAGE W 0 0 W W 31.6 W W W ote( 1 ) speed applies to oil lubrication. For rease lubrication, a maximum of % of this value is allowable. 9 1=0.2kf=0.4lbs. 1=0.039inch

6 EEDLE ROLLER AGES FOR GEERAL USAGE W W ote( 1 ) speed applies to oil lubrication. For rease lubrication, a maximum of % of this value is allowable. 1=0.2kf=0.4lbs. 1=0.039inch

7 EEDLE ROLLER AGES FOR GEERAL USAGE W W ote( 1 ) speed applies to oil lubrication. For rease lubrication, a maximum of % of this value is allowable. 1=0.2kf=0.4lbs. 1=0.039inch

8 EEDLE ROLLER AGES FOR GEERAL USAGE ote( 1 ) speed applies to oil lubrication. For rease lubrication, a maximum of % of this value is allowable. 1=0.2kf=0.4lbs. 1=0.039inch