outline types and features ¡rotational speed can be transmitted at constant velocity ¡greater torque capacity ¡long service life and high reliability ¡high transmission efficiency table 1 types and features of ntn constant velocity joint ¡low secondary moment ¡smooth and quiet rotation ¡easy handling with long lubrication life requiring infrequent re-rubrication variety type cvj number max allowable operating angle1 features fixed type disc type bj75dbj300d 14° to 18° capable of high speed operation no need for intermediate slide spline shaft cup type bj75cbj225c 25° greater operating angle excellent sealing sliding type doj 68fdoj200f flange type doj225fdoj625f short shaft series long shaft series 20° 8° to 10° expansion within joint is possible low sliding friction expansion friction coupling type bc68bc200 2 5° no alignment is needed easy installation 1 the maximum allowable operating angle is limited by a boot as well as the rpm and operating conditions of the cvj assembly 2
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outline sliding type outer race o-ring cage inner race boot band square-section circlip boot band c-ring ball round-section circlip boot shaft features expansion is possible within cvj the ball tracks on the outer race are parallel with the axis therefore relative axial expansion between the inner ring and outer ring is possible while transmitting power and providing an operating angle remarks 1 for the best operation of a sliding type joint the operating angleexpansion correlation operating method and installation/removal method should be considered for details contact ntn engineering 2 if much larger axial expansion is needed contact ntn engineering 3 some large size cvjs are capable of allowable maximum operating angle of 15° 4 if the user wants to use the sliding type joint assembly in a vertical position contact ntn engineering low sliding friction ensures smooth expansion expansion within the cvj is achieved by a rolling motion of the balls which contributes to very small sliding
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outline 1 3 by referring to the equivalent working transmission torque or power graph in fig 8 find a cvj basic number whose capacity at the operating rpm is greater than the equivalent working torque te or equivalent working transmission power qe determined in 1.2 fixed disc type 16600 equivalent working transmission torque capacity te n.m 9810 7850 5880 3920 2940 1960 981 785 588 392 294 196 bj9 5 5 9810 7850 join tb num asic ber fixed cup type 5880 equivalent working transmission torque capacity te n.m 3920 2940 1960 joint ba sic num bj225 bj200 bj175 ber bj3 00 bj2 50 bj2 25 bj2 00 bj1 75 bj1 50 bj1 25 bj150 981 785 588 392 294 196 bj125 bj100 bj95 98.1 78.5 58.8 10 bj7 bj75 98.1 78.5 58.8 10 20 30 40 60 80 100 200 300 400 600 800 1 000 2 000 20 30 40 60 80 100 200 300 600 1 000 2 000 4 000 400 800 3 000 no of revolutions rpm a equivalent working transmission torque capacity no of revolutions rpm a equivalent working transmission torque capacity equivalent working transmission powe
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outline 4 large size series doj225doj625 correlation between cvj angle and allowable expansion when an angle occurs on a cvj the balls will move and the allowable expansion will decrease the value of 2a in fig 16 is the total expansion decrease of a pair of joints to determine the expansion for intended application subtract 2a see fig 16 from the allowable expansion at 0° s mm z s z 500 400 a allowable offset joint basic number 300 200 100 30 a 1000 3000 5000 z mm center-to-center distance of cvj mm fig 17 allowable offset 2a doj550 doj625 doj500 20 doj450 doj400 doj350 doj300 doj250 10 doj225 9° allowable angle 10° decrease in allowable expansion 8° 7° 6° 0 2° 4° 6° cvj angle 8° 10° 5° 1000 3000 5000 z mm center-to-center distance of cvj fig 16 allowable expansion fig 18 allowable angle remarks the correlation between the center-to-center distance of cvj and allowable offset is given in fig 17 and that between the center-to-center distance of cvj and allowable angle is illustrated in
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disc type complete with semi-finished flange dfb dfb h and dfp dfp h series bj75 150 ga dfb dfb h ja dfp dfp h free side l fig 1 fixed side dhb dhb h and dhp dhp h series bj75 150 ga dhb dhb h ja dhp dhp h free side l fig 2 fixed side dimensional unit mm dimensional data joint basic number bj75 2 1 bj95 2 1 bj125 2 1 bj150 2 72.6 48.6 749 60.7 60.8 40.8 362 323 40.7 40.2 1.93 1.54 748 60.1 48.4 32.4 106 152 22.2 26.1 0.79 0.99 362 322 40.3 39.6 1.33 1.28 782 66.5 cvj center figure ga ja upper line lower line when l=500mm gd2 dfb dhb per additional 100mm 10-3 kg m2 left column upper line lower line mass kg right column dfb h dhb h upper line lower line when l=1000mm dfp dfp h dhp dhp h per additional 100mm when l=500mm per additional 100mm 1 36.7 24.7 16.4 45.3 40 7.15 0.12 13.6 12.5 0.25 0.56 0.39 16.3 45.2 39.8 106 151 6.92 0.08 13.3 12.1 0.15 21.8 25.7 0.54 0.81 0.43 0.31 23.6 52.4 46.6 113 166 375 360 10.3 16.7 0.96 15.0 24.7 30.0 2.1 44.6 46.0 5.2 1.04 0.75 0.49 26
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cup type complete with semi-finished flange clfb and clfpseries bj75 225 l clfb clfp free side fixed side clftseries bj75 225 l dimensional data clfb joint basic number bj75 bj95 bj100 bj125 bj150 bj175 bj200 bj225 when l=500mm 38.0 79.0 143 303 552 1011 2004 3026 10.0 14.9 20.9 33.5 46.2 66.0 98.1 128 gd2 10-3 kg m2 left column clfp mass kg right column clfp when l=1000mm 45.5 0.96 0.49 86.9 159 2.1 0.75 318 8.5 1.34 618 1133 17.8 2.26 2121 54.0 3.20 3414 121 171 54.0 3.20 39.4 61.2 88.9 17.8 2.26 8.5 1.34 19.3 27.1 2.1 0.75 14.2 0.96 0.49 per additional 100mm per additional 100mm 0.08 0.15 0.24 0.54 1.93 2.80 5.50 7.40 0.39 0.56 0.63 0.99 1.54 1.86 2.60 3.02 when l=1000mm 45.1 85.8 157 316 603 1110 2093 3254 13.2 17.6 25.6 37.8 56.2 80.0 112 151 per additional 100mm 32
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accesories acoaco 30° aosfhkdmggekdmfehkdmgpb 6-n p w b 6-n p b 6-n fig 1 disc bj75-150 201 202 series fig 2 disc bj75-150 204 205 series fig 3 disc bj75-300 201 202 series applicable joint bc68 width type coupling type fixed side free side fixed side free side outside dia c 9 12 p 35 74 62 104 92 74.5 10 45 f 60 55 85 80 g 107 55 socket m 0 0.046 figure 5 1 2 4 parts number 50-150#bc68 50-201#bj75 50-202#bj75 50-204#bj75 50-205#bj75 50-400#bj75 50-150#bc75 a 40 91 121 77 52 b 5 12 24 12 24 2.5 o 2 disc type bj75 cup type bc75 coupling type bc87 0.046 0 5 70 70 80 65 118 62 120 136 70 0 0.046 2.5 0 0.046 5 50-150#bc87 fixed side free side fixed side free side 1 2 50-201#bj95 50-202#bj95 50-204#bj95 50-205#bj95 50-400#bj95 57 133 147 82 97 67 155 175 115 80 178 194 123 90 192 139 112 215 154 132 227 169 240 262 7 50 16 32 16 32 2.5 2.5 7 20 40 20 40 3 15 10 24 48 24 48 3 10 34 54 4 12 35 55 4 12 35 55 4 38 58 45 70 18 15 12 112 96 126 110 79.5 94.5 60 130 110 150 130 112 70 148 124 164
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usage and handling usage and handling 4 cautions for installation work 1 installation procedure 1 checking the installation dimensions check that the mounting span on the machine coincides with the length of the constant velocity joint see fig 1 fig 1 2 filling the grease fill the grease included with the constant velocity joint to 1/2 to 1/3 as much as the undercut space capacity of the mounting flange hub see fig 2 caution the grease can cause eye inflammation to human eyes when handling it wear protective goggles if it has contaminated the eyes rinse with clean water and immediately seek medical attention the grease can cause skin inflammation when handling it wear protective gloves if it has touched skin wash it off thoroughly with water and soap ¡avoid hitting the cvj with a foreign object or exerting an impact force onto the cvj ¡limit the angle to the operating angle range at static state in order to avoid damage on the boot ¡be careful not to damage or deform the boot and boo
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usage and handling step 5 mount the cvj assembly onto the shaft until the inner race is against the square section circlip see photo 17 and lock it with a c-ring photo 18 caution carefully handle a c-ring the ring can fly owing to its spring force photo 17 c-ring photo 18 step 6 inject ntn provided authorized grease into the mounting portion on the cvj assembly photo 19 photo 19 step 7 fit the boot into the boot retaining grooves on the shaft and outer race fit the boot bands over the boot and fasten them1 photo 20 1 for fastening the boot bands see sec 4.6 and 4.7 on page 60 free side cvj for assembling the free side cvj observe the assembly procedure for the fixed side cvj except for step 2 installation of the square-section circlip and step 5 installation of the c-ring photo 20 56
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service conditions confirmation sheet ntn constant velocity joint service conditions confirmation sheet company name machine area date service conditions motor 1 kind of prime motor engine ac dc gasoline diesel output no of cylinders kgf m 2 number of joints to be driven per unit 3 joint rotation speed 4 rotating direction constant one direction constant 5 transmission torque variable 6 shock 7 service hours 8 joint installation drawing driving end key groove width x depth follower end key groove width operating angle x depth none max approx to normal to min kgf m r/min variable r/min r/min r/min r/min forward/reverse kgf m against the rated torque of driving source hrs/day others 24 hrs/day constantly c d stroke albx [remarks when the above drawing is not applicable make a special study when the installation/operation position l and x y changes confirm the changed position amount and the loading condition at that position 9 installation direction 10 11 outside diameter limit 12 p
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