NMTG Code No Nm 0.0 K Torque Nm Nm 0.8 K 0.5 K 0.4 K 0.3 K 0.2 K 0.1 K Nm Nm Nm Nm NHB20H NHB20 NHB20H1 NHB25 NHB30 NHB35H NHB35 NHB40H NHB40 NHB45 NHB45H NHB50H NHB50 NHB50H1 NHB60 NHB60H NHB70 NHB80 NHB90 NHB95H NHB95 NHB100 NHB120H NHB120 NHB140 NHB155 NHB185 NHB185H NHB185H1 NHB185H2 NHB185H3 NHB185H4 NHB205 NHB230 NHB230H NHB235 NHB240 NHB240H NHB250 NHB280 NHB410 105 180 220 455 480 555 655 515 800 800 940 1190 1585 1500 2475 2080 3665 7625 7200 10000 8700 15000 20300 20000 30700 31000 36140 31500 80190 58400 50000 116330 44060 64350 94050 68000 75240 110880 80190 154440 192555 - - - - - - - - - - - - - - 2425 - 3465 7230 4800 9400 5400 12000 18800 13000 20300 24000 34150 24000 76700 55940 42000 111380 42080 61380 90590 50000 71780 105930 77220 133160 177700 - - - - - - - - - - - - - - 2425 - 3465 7230 5600 9400 5500 13000 18800 14000 22770 26000 34650 26000 77700 56430 44000 112370 42570 61880 91580 56000 72270 106920 77720 142560 186610 100 150 - 430 - 525 625 455 - - 880 1100 1440 - 2425 - 3465 7230 6000 9500 6700 14000 19300 15000 26240 29000 35150 29000 78700 56930 45500 113360 43070 62870 92570 61000 73260 108400 78700 150980 188100 100 160 200 435 420 535 635 475 700 700 900 1130 1485 1200 2425 1980 3565 7425 6800 9700 7900 12900 19800 16000 29700 30000 35150 30000 79200 57900 47000 114840 43560 63360 93560 61500 73760 109400 79200 152460 190080 105 170 212 445 470 545 645 495 780 780 920 1160 1535 1350 2475 2030 3565 7525 7000 9900 8500 14000 20300 19000 30200 30500 35640 30500 79700 57900 49000 115340 43560 63860 94050 67000 74250 109890 79700 153450 191570 - - - - - - - - - - - - - - - - - - - - - - - - - - 33660 19500 76200 55440 33000 110390 41090 59400 83660 44000 69300 98010 64850 106920 143550 890 860 860 820 750 750 730 750 720 700 700 670 630 630 430 610 400 320 320 320 320 250 250 250 240 220 220 220 220 220 190 210 200 200 205 195 195 195 195 180 170 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 6000 5000 4500 4000 3500 3000 3000 2700 2700 2700 2100 3000 3000 3000 3000 2500 2500 1300 2500 2500 2500 1100 2500 2100 2000 1800 1500 Lift off speed Rpm Max. speed Rpm 4 Design and Construction of Hold Back NHB (NMTG's Versatile Product) The Hold Back Device is designed with Centrifugal Lift off Sprag - CLS where the shaft overruns at high speed (drive speed 1440 rpm). This Hold Back has each CLS fitted with preloaded Torsion Spring that are supported between Cage Plates (Guide Plates) and finally firmly mounted on Inner Race. The driving torque is transmitted to Outer Race through CLS. It is basically a friction dependent device i.e. only works in presence of friction between contact surfaces of Sprags with relative races. The friction creates a wedging effect with loaded element to transmit torsion load while maintaining Strut Angle. During transmission of torsion torque deflection of contacts occur which is adequately controlled by preload of Torsion Spring. When the Lift-off Speed is reached the CLS get automatically disengaged completely and rotate contact free, means this situation creates clearance between upper tip of the Sprag and contact surface of Outer Race (see figure.2) eliminating total friction or absolute no friction and wear at contact surfaces which impart long life to Hold Back. When the speed of Inner Race decrease to such an extent that the effect of the centrifugal force on the Sprag is less than that of the preloaded Torsion Spring force, at that time the Sprag again rest on the Outer Race contact surface and the Free Wheel are ready to lock position (see figure-1) s s A Fig.1 Fig. 2 NMTG Mechtrans Techniques Pvt. Ltd. 6 5 Performance criteria 17012018

NMTG Mechtrans Techniques Pvt. Ltd. · 2019. 11. 23. · The Hold Back Device is designed with Centrifugal Lift off Sprag - CLS where the shaft overruns at high speed (drive speed

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Page 1: NMTG Mechtrans Techniques Pvt. Ltd. · 2019. 11. 23. · The Hold Back Device is designed with Centrifugal Lift off Sprag - CLS where the shaft overruns at high speed (drive speed

NMTGCode No

0.0 K

Torque Nm Nm

0.8 K0.5 K0.4 K0.3 K0.2 K0.1 K

NmNm NmNm

NHB20HNHB20NHB20H1NHB25NHB30NHB35HNHB35NHB40HNHB40NHB45NHB45HNHB50HNHB50NHB50H1NHB60NHB60HNHB70NHB80NHB90NHB95HNHB95NHB100NHB120HNHB120NHB140NHB155NHB185NHB185HNHB185H1NHB185H2NHB185H3NHB185H4NHB205NHB230NHB230HNHB235NHB240NHB240HNHB250NHB280NHB410

1051802204554805556555158008009401190158515002475208036657625720010000870015000203002000030700310003614031500801905840050000116330440606435094050680007524011088080190154440192555

--------------2425-3465723048009400540012000188001300020300240003415024000767005594042000111380420806138090590500007178010593077220133160177700

--------------2425-3465723056009400550013000188001400022770260003465026000777005643044000112370425706188091580560007227010692077720142560186610

100150-430-525625455--88011001440-2425-3465723060009500670014000193001500026240290003515029000787005693045500113360430706287092570610007326010840078700150980188100

100160200435420535635475700700900113014851200242519803565742568009700790012900198001600029700300003515030000792005790047000114840435606336093560615007376010940079200152460190080

105170212445470545645495780780920116015351350247520303565752570009900850014000203001900030200305003564030500797005790049000115340435606386094050670007425010989079700153450191570

--------------------------336601950076200554403300011039041090594008366044000693009801064850106920143550

890860860820750750730750720700700670630630430610400320320320320250250250240220220220220220190210200200205195195195195180170

50005000500050005000500050005000500050005000500050005000600050004500400035003000300027002700270021003000300030003000250025001300250025002500110025002100200018001500

Lift offspeedRpm

Max.speedRpm

4 Design and Construction of Hold Back NHB (NMTG's Versatile Product)

The Hold Back Device is designed with Centrifugal Lift off Sprag - CLS where the shaft overruns at high speed (drive speed 1440 rpm). This Hold Back has each CLS fitted with preloaded Torsion Spring that are supported between Cage Plates (Guide Plates) and finally firmly mounted on Inner Race. The driving torque is transmitted to Outer Race through CLS. It is basically a friction dependent device i.e. only works in presence of friction between contact surfaces of Sprags with relative races. The friction creates a wedging effect with loaded element to transmit torsion load while maintaining Strut Angle. During transmission of torsion torque deflection of contacts occur which is adequately controlled by preload of Torsion Spring.

When the Lift-off Speed is reached the CLS get automatically disengaged completely and rotate contact free, means this situation creates clearance between upper tip of the Sprag and contact surface of Outer Race (see figure.2) eliminating total friction or absolute no friction and wear at contact surfaces which impart long life to Hold Back. When the speed of Inner Race decrease to such an extent that the effect of the centrifugal force on the Sprag is less than that of the preloaded Torsion Spring force, at that time the Sprag again rest on the Outer Race contact surface a n d the Free Wheel are ready to lock position (see figure-1)

Fig.1 Fig. 2

NMTG Mechtrans Techniques Pvt. Ltd.

5 Performance criteria

17012018