Design and Selection for Bearing Applications by NTN Corporation Japan
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NTN Corporation Japan Contact InformationNTN Corporation
3-17, 1-chome, Kyomachibori ,
Nishi-ku, Osaka, 550-0003 Japan
http://www.ntn.co.jp/ |
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Searched and foundbearing application bearing diameter calculation bearing housing dimensions bearing made in japan bearing materials bearing size calculation bearings applications bore fit of bearing calculation clearance design design calculations design of sleeve bearing designated designation designe designed designs expansion bearing fit selections h h house design house designing housing for bearing interference and temperature interference fit low temperature material select material used and application for shaft materials selection minimum shaft diameter calculation motion and types of motion mount for bearing ntn application ntn plastic plain bearing application plain bearing selection plain bearing using plastic bearing plastic bearings plastic sleeve bearings press fit bearing into housing select selected selection selection of bearing selections selective shaft design shaft diameter calculation shaft fits for bearings shaft selection shafts and keys sizes of bearing sl 1 using plain bearings
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6 design and selection for bearing applications 6-2 estimation of wear the life of an ntn engineering plastics bearing is defined by the wear of sliding surface as with an ordinary plain bearing the amount of wear varies with operating conditions such as sliding velocity pressure type of motion surface roughness of mating material and operating temperature generally the estimation of wear is given by the following formula rkpvt where r the amount of wear mm k wear factor mm min mpa m h p pressure mpa v sliding velocity m min t time h surface roughness of the mating material influences the wear of the ntn engineering plastics bearing therefore finish the surface to 0.1 to 0.8a moreover ntn recommends the hardness of shaft to be hrc 22 or higher since it is possible to reduce the wear when the shaft is harder
| design and selection for bearing applications 6-3 fits and clearance plain bearings are usually pressed into a housing the minimum clearance for operation varies by the size of shaft though it can be as small as 0.025mm when the operating temperature varies widely the thermal expansion of bearing material should be taken into consideration increase the clearance by the amount of thermal expansion with decreases the operating clearance it is also possible to finish the bore of mounted bearing by turning or reaming when accurate operation with small clearance is required although recommended shaft and bore diameters and mounted clearance are listed in the tables of standard series of ntn engineering plastics sliding bearings the mounted clearance may increase for soft material housings such as aluminum and plastics or thin wall housing also it is recommended to fix the bearing with a knock-pin key or bonding since the interference fit might be lost when the bearing is used under low temp
| design and selection for bearing applications 1 calculation of clearance for standard temperature 25°c 1 interference maximum fh dh hl minimum fl dl hh 2 reduction of bearing bore dimension due to interference fit fh 1.0 maximum emax fl 1.0 minimum emin 3 bore dimension of bearing at standard temperature when mounted maximum d25h dh emin minimum d25l dl emax 4 mounted clearance at standard temperature maximum cmax d25h sl minimum cmin d25l sh where sh maximum shaft diameter sl minimum shaft diameter hh maximum housing bore diameter hl minimum housing bore diameter dh maximum bore diameter of bearing dl minimum bore diameter of bearing dh maximum outer diameter of bearing dl minimum outer diameter of bearing note 1 the minimum clearance for ntn engineering plastic bearing is required 2 7/1000 of shaft diameter to reduce heat generation when used with no lubrication 2 shrink ratio by fit interference usually is set as 100
| design and selection for bearing applications 3 calculation of clearance for low temperature tl°c 1 housing bore dimension maximum hlh hh 1 11 tl 25 minimum hll hl 1 11 tl 25 2 shaft diameter maximum slh sh 1 minimum sll sl 1 6-4 handling a assembling method avoid hammering when pressing the bearing into the housing use press machine with press arbor shown in figure 19 after centering bearing and be sure that the housing chamfer is adequately large use a knock pin or key to prevent rotation of the bearing or use an adhesive to fasten the bearing for low temperature application because the fitting might be loosened remarks large-sized plastic bearings can be installed easily by cooling the bearing with dry ice 22 22 tl 25 tl 25 3 clearance during operation maximum clmax h h 1 sl 1 2 tl 25 tl 25 22 11 2 h h2 d25h2 1 33 tl 25 2 minimum clmin h l 1 sh 1 2 11 tl 25 2 22tl 25 h l2 d25l2 1 33 tl 25 2 where 11 coefficient of linear expansion of housing for tl°c 22 coefficient of linear exp
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