Curved Jaw Couplings. Curved Jaw Couplings From Lovejoy

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1 Curved Jaw Couplings From Lovejoy Introduction For over 100 years Lovejoy Inc. has set the standard for straight jaw couplings in the United States and around the world. Now, Lovejoy Inc. is proud to present the CJ and GS Series, a full line of curved jaw products for the world market. The CJ Series curved jaw coupling provides highly reliable service for light, medium, and heavy duty electrical motor and internal gas combustion engine applications. The GS Series provides a coupling solution for the motion control industry This product offering will continue Lovejoy's long history of being the world's premier coupling supplier. The Curved Jaw Design The three-piece design incorporates a radial curvature to the jaw face and both radial and axial curvature (crowning) to the elastomer (spider). The curved jaw hubs are offered in sintered iron, steel, aluminum, cast and nodular iron materials. The CJ Series curved jaw coupling and the variety of urethane elements allows for angular, parallel, and axial misalignment. The simplicity of the three-piece design makes it easy to assemble. Unlike some metallic coupling designs, the CJ Series design requires no lubrication. When assembled, the CJ Series offers no metal to metal contact of parts. The elastomer in compression design offers the benefit of continuing to function even after the elastomeric element fails (fail-safe design). The torque range of the CJ Series product is 7.5 to 28,000 Nm. Lovejoy offers the CJ Series in a range of product with finished stock metric bores and keyways for sizes 14 through 75/90. Sizes are also available with metric bores on a made-toorder basis. Elastomers (spider materials) Lovejoy offers four types of spiders for the CJ Series curved jaw coupling product line. Urethane spiders provide high abrasion resistance and elasticity, along with good damping characteristics. The spiders are offered in a variety of shore hardnesses, each providing a different level of torque capacity, damping, and chemical resistance. The 92 shore spider (white or yellow) is standard, offering excellent torque carrying capacity. The 80 shore spider (blue) offers the best damping characteristics. The 95/98 shore spider (red) offers the highest torque carrying capacity. The 64 shore spider (green) is offered for high humidity environments. The standard spiders also feature an open center to accommodate small between shaft end measurements. All standard spiders have a rated temperature capacity of 100 C. (See page 15 for GS spider temperature ratings.) The urethane material also resists oil, dirt, sand, grease, moisture, many solvents, as well as the atmospheric effects of ozone. Elastomer Recommendation Chart Spider Type Application types requiring: 80 shore A (Blue) Good damping properties 92 shore A (Yellow) General & hydraulic applications 95/98 shore A (Red) High torque requirements 64 shore D (green) High torque & humidity environments Standard Spider Design Elastomer Performance Data Temperature Range Stock Misalignment Spider Type Color Material Normal Maximum Sizes Angular Parallel Axial Typical Applications 80 Shore A Blue Polyurethane -40 to 100 C -40 to 120 C deg mm mm Good damping properties 92 Shore A Yellow Polyurethane -40 to 100 C -50 to 120 C deg mm mm General & hydraulic applications 95/98 Shore A Red Polyurethane -40 to 100 C -40 to 120 C deg mm mm High torque requirements 64 Shore D Green Polyurethane -30 to 110 C -30 to deg mm mm High humidity environments 1

2 The CJ Series Selection Process* Step 1: Determine the nominal torque of your application: Tkn [Nm] = P[kW] X 9550 rpm [1/min] Step 2: Calculate your Application Service Factor using the charts below. The total Service Factor (K) will be: K = K1 x K2 x K3 Step 3: Calculate the design torque (D Tkmax ) of your application. Design Torque (DT kmax ) = Nominal Torque X service factor. Step 4: Using the Elastomer performance data charts on pages 3 & 4 select the urethane shore hardness which best corresponds to your relative damping needs in the application. Step 5: Next find the columns listing T kn and T kmax values listed in Nm and compare them against the DT kmax figure for your application. Make sure that the spider/coupling size values are larger than the application values. Step 6: Once the size is selected using the torque values, check the table on page 6 to make sure the bore size needed will fit in the coupling. Step 7: Double check the overall dimensions of the coupling to ensure that it will fit in the space allowed for the coupling in the application. * This selection process is based on application factors only. A selection process is also available using DIN 740 part 2 standard. Consult with Lovejoy Engineering for details. Application Service Factor (K1) Uniform operation with small masses to be accelerated. Hydraulic and centrifugal pumps, light generators, blowers, fans, ventilators, belt/screw conveyors. Uniform operation with medium masses to be accelerated. Sheet metal bending machines, wood working machines, mills, textile machines, mixers. Irregular operation, with medium masses to be accelerated. Rotating ovens, printing presses, generators, shredders, winders, spinning machines, pumps for viscous fluids. Irregular operation and shocks, with medium masses to be accelerated. Concrete mixers, drop hammers, cable cars, paper mills, compression pumps, propeller pumps, rope winders, centrifuges. Irregular operation and heavy shocks, with large masses to be accelerated. Excavators, hammer mills, piston pumps, presses, rotary boring machines, shears, forge presses, stone crushers. Irregular operation and very heavy shocks, with very large masses to be accelerated. Piston type compressors and pumps without speed variations, heavy roll sets, welding machines, brick presses, stone crushers. Service Factor (K1) 1,0 1,2 1,3 1,4 1,6 1,8 Application Service Factor for Starts per Hour (K2) Starts per hour Service Factor (K2) 1,0 1,2 1,4 1,6 Application Service Factor for Ambient Temperature (K3) Ambient Temperature -30 to +30 C +40 C +60 C + 80 C Service Factor (K3) 1,0 1,2 1,4 1,8 Definition of Terms T kn T kmax P[kW] rpm[1/min] Nm DT kmax T kw P kw Rated coupling torque Maximum torque of the coupling Power in kilowatts Revolutions per minute Newton meters Maximum torque of the application Varying load of an application in kilowatts Allowable power loss 2

3 Elastomer Torque Ratings Maximum Speed Wind-Up Torque (Nm) Size [1/min] at Angle Nominal Maximum Varying peripheral speed = Load Dynamic Torsional Stiffness [Nm/rad] 30 m/s* 40 m/s T kn T kmax T kn T kmax T kw P kw 100 % T kn 75 % T kn 50 % T kn 25 % T kn Urethane Spider - 92 Shore A (White or Yellow) ,4 10 7,5 15 2,0-0,38 x ,31 x ,24 x ,14 x ,6 4,8 1,28 x ,05 x ,80 x ,47 x ,1 6,6 4,86 x ,98 x ,01 x ,79 x ,4 10,90 x ,94 x ,76 x ,01 x ,2 21,05 x ,26 x ,05 x ,74 x ,0 23,74 x ,47 x ,72 x ,73 x ,8 36,70 x ,09 x ,75x ,49 x ,6 50,72 x ,59 x ,45 x ,64 x , ,0 97,13 x ,65 x ,22 x ,70 x ,6 113,32 x ,92 x ,26 x ,65 x ,0 190,09 x ,87 x ,86 x ,86 x ,0 253,08 x ,53 x ,91 x ,01 x ,0 311,61 x ,52 x ,20 x ,52 x ,0 474,86 x ,39 x ,41 x ,51 x ,6 660,49 x ,60 x ,50 x ,73 x ,0 890,36 x ,10 x ,03 x ,21 x ,0 2568,56 x ,22 x ,51 x ,95 x 10 3 Urethane Spider - 98 Shore (Red) Sizes 14-55/95 Shore (Red) Sizes , ,5 25 3,3-0,56 x ,46 x ,35 x ,21 x ,4 4,8 2,92 x ,39 x ,81 x ,07 x ,6 9,93 x ,14 x ,16 x ,65 x ,4 26,77 x ,95 x ,60 x ,84 x ,2 48,57 x ,83 x ,11 x ,85 x ,0 54,50 x ,69 x ,79 x ,03 x ,8 65,29 x ,54 x ,48x ,00 x ,6 94,97 x ,88 x ,88 x ,90 x , ,0 129,51 x ,20 x ,30 x ,60 x ,6 197,50 x ,95 x ,45 x ,58 x ,0 312,20 x ,00 x ,56 x ,73 x ,0 383,26 x ,27 x ,62 x ,85 x ,0 690,06 x ,85 x ,84 x ,60 x ,0 1343,64 x ,79 x ,06 x ,79 x ,6 1424,58 x ,16 x ,24 x ,54 x ,0 2482,23 x ,43 x ,98 x ,22 x ,0 3561,45 x ,40 x ,10 x ,84 x 10 3 Urethane Spider - 80 Shore A Sizes (Blue) , ,9 9,7 1,3-0,25 x ,21 x ,17 x ,11 x ,4-0,90 x ,75 x ,52 x ,03 x ,30 x ,93 x ,52 x ,03 x ,10 x ,45 x ,75 x ,85 x ,90 x ,05 x ,00 x ,70 x ,00 x ,81 x ,30x ,60 x ,95 x ,45 x ,71 x ,50 x , ,05 x ,08 x ,79 x ,89 x ,00 x ,44x x ,85 x ,00 x ,20 x ,05 x ,00 x ,69 x ,00 x ,20 x ,00 x ,00 x ,04 x ,00 x ,00 x ,00 x ,00 x ,00 x ,06 x 10 3 * Lovejoy recommends using 30 m/s as maximum speed. For operating speed above maximum use only steel or nodular iron hubs, dynamic balancing required. 3

4 Elastomer Torque Ratings (Continued) Special Elastomer: 64 Shore D Rating Chart* Maximum Speed Torque (Nm) [1/min] at Wind-Up Angle Nominal Maximum Varying Dynamic Torsional Stiffness [Nm/rad] peripheral speed = Load Size 30m/s** 40m/s T kn T kmax T kn T kmax T kw P kw 100% T kn 75% T kn 50% T kn 25% T kn ,5 7, ,2 9,0 0,76 x ,62 x ,47 x ,28 x ,5 7,2 5,35 x ,39 x ,32 x ,97 x ,5 9,9 15,11 x ,39 x ,37 x ,55 x ,6 27,52 x ,57 x ,06 x ,12 x ,3 70,15 x ,52 x ,49 x ,78 x ,0 79,86 x ,49 x ,52 x ,35 x ,7 95,51 x ,32 x ,22x ,10 x ,4 107,92 x ,50 x ,91 x ,66 x ,5 3, ,0 151,09 x ,90 x ,68 x ,53 x ,4 248,22 x ,54x ,90 x ,22 x ,0 674,52 x ,11 x ,20 x ,89 x ,0 861,17 x ,16 x ,93 x ,48 x ,0 1138,59 x ,64 x ,92 x ,43 x ,0 1435,38 x ,01 x ,93 x ,50 x ,9 1780,73 x ,20 x ,05 x ,42 x ,5 3075,80 x ,16 x ,00 x ,36 x ,0 6011,30 x ,27 x ,01 x ,15 x 10 3 Max Metric Bore Chart [mm] Urethane Spider - 64 Shore D (Green) * When using the 64 Shore D spider, steel and nodular iron hubs should be used. ** Lovejoy recommends using 30 m/s as maximum speed. For operating speed above maximum use only steel or nodular iron hubs, dynamic balancing required. Size Material A Hub B Hub A Hub B Hub BX Hub Set Screw Pre bore Pre Bore Max Bore Max Bore Max Bore Size 14 Aluminum - Solid - 16 Solid M4 Powdered Metal - Solid M4 Aluminum Solid Solid M5 19/24 Steel Solid Solid M5 Powdered Metal M5 Aluminum Solid Solid M5 24/32 Steel Solid Solid M5 Powdered Metal M5 Aluminum Solid M8 28/38 Steel Solid Solid M8 Powdered Metal M8 Aluminum Solid M8 38/45 Steel Solid Solid M8 Powdered Metal M8 Aluminum Solid M8 42/55 Steel Solid Solid M8 Powdered Metal Solid M8 Aluminum Solid M8 48/60 Powdered Metal Solid M8 Steel Solid Solid M8 55/70 Cast Iron Solid M10 Steel Solid Solid M10 65/75 Cast Iron Solid M10 Steel Solid Solid M10 75/90 Cast Iron Solid M10 Steel Solid Solid M10 90/100 Cast Iron Solid M12 Steel Solid Solid M Nodular Iron/Cast Iron M Nodular Iron/Cast Iron M Nodular Iron/Cast Iron M Nodular Iron/Steel M Nodular Iron/Steel M Nodular Iron/Steel M20 4

5 l Lovejoy CJ Series Couplings (92 Shore Element) For IEC Standard Motors Three phase Motor - 50 Hz Motor Size S 90L 100L 112M 132S 132M 160M 160L 180M 180L 200L 225S 225M 250M 280S 280M 315S 315M 315L Cyl shaft end diameter x length 2 Pole 4,6,8 Pole P [kw] T[Nm] 0,09 0,32 9 x 20 0,12 0,41 0,18 0,62 0,12 0,88 0,06 0,7 11 x 23 0,25 0, ,18 1,3 0,09 1, ,37 1,3 0,25 1,8 0, ,09 1,4 14 x ,55 1,9 0,37 2,5 0,25 2,8 0,12 1,8 19 x 40 0,75 2,5 0,55 3,7 0,37 3,9 0,18 2,5 1,1 3,7 0,75 5,1 0,55 5,8 0,25 3,5 19/24 19/24 19/24 19/24 1,5 5 1,1 7,5 0,75 8 0,37 5,3 24 x 50 2,2 7,4 1,5 10 1,1 12 0,55 7,9 3 9,8 2,2 15 0, x 60 24/ /28 1, /28 1, / ,2 22 1,5 21 5,5 18 5, ,2 30 7, x 80 28/38 28/38 28/38 28/38 7, , x /45 38/45 7, /45 5, /45 18, , x , / /55 42/ / , x , x x /60 48/60 48/ x x / / / /70 75 x /70 65/70 65/70** 65/70** ** ** ** 80 x x / / / /90 90/ x x x / x x x x **With steel version curved jaw hub. Motor Performance n=3000 [1/min] 2 Pole Coupling Size Motor Performance n=1500 [1/min] 4 Pole P [kw] T[Nm] Coupling Size Motor Performance n=1000 [1/min] 6 Pole P [kw] T[Nm] Coupling Size Motor Performance n=750 [1/min] 8 Pole P [kw] T[Nm] Coupling Size 5

6 Coupling Dimensions And Materials Configuration One - 2 A Hubs Hub Dimensions (mm) Curved Jaw Coupling Configuration Two - 2 B Hubs Cast AL Cast Iron Nodular Iron PM/Steel Min/ Min/ Min/ Min/ LTB1 Hub Pre Max Pre Max Pre Max Pre Max & Size Style Bore Bore HD Bore Bore HD Bore Bore HD Bore Bore HD LTB2 G W OAL T;U OD H 14 B Style S S-16 - S S , BX Style S S-16 - S S-16-18,5 13 1, A Style S S S S /24 B Style S S BX Style S S-24 - S S A Style S S S S /32 B Style S S BX Style S S-32 - S S A Style S S S S , /38 B Style , BX Style S S-38 - S S , A Style S S S S /45 B Style BX Style S S-45 - S S A Style S S S S S S /55 B Style S S BX Style S S-55 - S S /60 A Style S S-48 - S S S S , B Style S S , BX Style S S , A Style S S S S /70 B Style S S BX Style S S A Style S S S S , /75 B Style S S , BX Style S S , A Style S S S S /90 B Style S S BX Style S S A Style S S S S , /100 B Style S S , BX Style S S , B Style B Style , B Style B Style , B Style B Style , = Distance between spider and hub face. H = Inside diameter of spider. W = Spider thickness. Max Bore refers to maximum straight bore with keyway allowed in hub. S = Solid hub with no bore. OD is equal to HD for B style aluminum sizes: 19, 24, and 28. BX Hub = Extended length hub. 6

7 Hub Designs Keyway With Set Screw (KW) Standard Lovejoy method of securing a hub to a shaft. Clamping style recommended for backlash free torque transmission. Spline Hub With Set Screw (W/SS) Hub bored to accept standard S.A.E. and metric spline, secured with set screw to shaft. Without Keyway, With Set Screw (W/SS) Set screw used to secure hub to shaft. Spline Hub With Clamp (C) Hub bored to accept standard S.A.E. and metric spline, secured utilizing a clamping feature. Spline Hub With L-Loc (L-LOC) Hub bored to accept standard SAE and metric spline using the more efficient L-Loc feature to secure hub on shaft. Clamping Hub With Single Slot Without Keyway (SC) Zero backlash clamping style for torque transmission. Torque capacity of hub depends on bore sizes. Clamping Hub With Single Slot With Keyway (CWK) Zero backlash clamping style with keyway for torque transmission. Hub With Frictional Locking Device (LD) This hub utilizes a shaft locking device to allow for shaft engagement. 7

8 Metric Bore And Spline Specifications Metric Bore Sizes Hub FIN Cylindrical Finish Bores (mm) H7 Keyway to DIN 6885 Sheet 1 (JS9) and Set Screw Size Type Bore Pre AL 14 B O O O O O O O O O O PM B O O O O O O O O O O AL A O O O O O O O O O B O O O O 19 PM A O O O O O O O O O O B O X O O O O O O O O OX O O OX O A O O O O O O O O O AL B O O O O 24 A O O O O O O O O O O PM B O X O O O O O O O O OX O OX A O O O O O O O O O O O AL B O O O O O 28 A O O O O O O O O O O O PM B O X O O O O O O O O O O OX O O O OX AL A O O O O O O O O O O 38 B O O O O PM A O O O O O O O O O O O O O O B O X O O O O O O O O O O O O O X O OX AL A O O O O O O O O 42 B O O O O O O GG A O O O O O O O O O O B O X O X O OX O OX AL A O O O O O O O O O B O O O O O 48 A O O O O O O O O O O O GG B O X O O O OX 55 GG A O O O O O O O O O O O O B O X O O O O GG A O O O O O O O O O 65 STL A O O GG A O O O O O O O O O O O 75 STL A O O 90 GG A O O O O O O O O O O O Inch Bores d t AL = Aluminum Hub STL = Steel Hubs GG = Cast Iron Hub O = Style A or B hub (standard length hub) PM = Powered Metal Hub X = Style BX hub (long hub) All Steel Hubs Dimensions of the Codes (+0,2) Code d d inch b +0,05 t +1,2 2 Tb ,03 3/ DNB M7 7/ T H7 1/ Ta ,03 1/ DNC H7 17/ E ,03 5/ S ,03 5/ Es ,03 5/ DND H7 5/ Ed ,03 5/ DNH H7 11/ Ad ,03 3/ As ,03 3/ A ,03 3/ Dimensions of the Codes (+0,2) Code d d inch b +0,05 t +1,2 2 Fa / Ga H7 7/ DNI H7 7/ Gs ,03 7/ G ,03 7/ F ,03 7/ Gd M7 7/ Gf ,03 15/ B , Ba H Bs , H , DNF H Hs , Dimensions of the Codes (+0,2) Dimensions of the Codes (+0,2) Code d d inch b +0,05 t +1,2 2 Code d d inch b +0,05 t +1,2 2 C ,03 1-1/ Sa M7 1-1/ N ,03 1-5/ Sb ,03 1-1/ Nb M7 1-5/ Sd ,03 1-1/ Ls ,03 1-3/ Ja H7 1-1/ L K7 1-3/ Jc ,03 1-1/ Lu M7 1-7/ Js ,03 1-1/ Da , / J ,03 1-1/ Ds , K H7 1-1/ D , DNK H7 1-1/ P ,03 2-1/ Ma M7 1-3/ Pa M7 2-1/ M ,03 1-3/ Ub M7 2-3/ RH M7 1-3/ Wa M7 2-7/ Cb ,03 1-7/ Wd M7 3-7/ Ca ,03 1-1/ Wf M7 3-7/ Size Materials Style 14 Aluminum B Hub Ed 19 PM B Hub A Ed Gs Aluminum A Hub A Es 8 Code Size Materials Style Code 38 Aluminum A Hub F 42 Cast Iron A Hub C G F K Bs Ma B Hub L 24 PM B Hub A G F Ta Gd Aluminum A Hub Nb Aluminum A Hub A G F 48 Cast Iron A Hub C G Nb K 28 PM B Hub A G F K 55 Cast Iron A Hub C K L Aluminum A Hub A G F 65 Cast Iron A Hub C Pa K 38 PM A Hub A G F K Bs DNI Sb 75 Cast Iron A Hub C K

9 Taper Bores Spline Bores Taper Bores Taper Dimensions 1:5 Taper Dimensions 1:8 T 2 d b Code d +0,05 b +0,05 T +0,1 2 l k A 10 9,85 2 1,0 11,5 B 17 16,85 3 1,8 18,5 C 20 19,85 4 2,2 21,5 Cs 22 21,95 3 1,8 21,5 D 25 24,85 5 2,9 26,5 E 30 29,85 6 2,6 31,5 F 35 34,85 6 2,6 36,5 G 40 39,85 6 2,6 41,5 Taper Dimensions 1:10 Code d +0,05 b JS9 T +0,1 2 l k CX20 19, ,1 32 DX25 24, ,1 45 EX30 29, ,0 50 Code d +0,05 b +0,05 T +0,1 2 l k N/ 1 9,7 2,4 10,85 17 N/ 1c 11,6 3 12,90 16,5 N/ 1e 13 2,4 13,80 21 N/ 1d ,50 17,5 N/ 1b 14,3 3,2 15,65 19,5 N/ 2 17,287 3,2 18,24 24 N/ 2a 17, ,94 24 N/ 2b 17, ,34 24 N/ 3 22, ,40 28 N/ 4 25,463 4,78 27,83 36 N/ 4b 25, ,23 36 N/ 4a 27 4,78 28,80 32,5 N/ 4g 28, ,32 38,5 N/ 5 33,176 6,38 35,39 44 N/ 5a 33, ,39 44 N/ 6 43,057 7,95 3, N/ 6a 41,15 8 3,1 42,5 Ordering Procedure for Taper 1:8 Before the N insert the pump type. After the N insert the coupling type. Codes...N.../6 and...n.../6a have keyways parallel to taper. Spline Bores Clamping Hub With L-Loc (L-Loc) (recommended) Clamping Hub With Spline Bore (SC) (recommended) Taper Bore Hub Availability Charts Taper Hub Sizes Available 1: Code STL AL STL AL STL AL STL AL Cast Iron A10 X X B17 X X X X X X C20 X X X D25 X X X STL = Steel Hub DIN 5480 Spline Specifications Pitch Number Type Size Diameter Module of Teeth 20 x 1 x 18 x 7H x 1,25 x 14 x 7H 17,5 1, x 1,25 x 18 x 7H 22,5 1, x 2 x 13 x 7H x 2 x 14 x 7H x 2 x 16 x 8H x 2 x 18 x 7H x 2 x 21 x 7H x 2 x 22 x 9H x 2 x 24 x 7H DIN 5480 Spline Hub Availability Hub With Spline Bore And Set Screw (W/SS) (not recommended) Code X 1.25 x 14 x 7H O 25 x 1.25 x 18 x 7H O 30 x 2 x 14 x 7H X O 35 x 2 x 16 x 8H x 40 x 2 x 18 x 7H O O 50 x 2 x 24 x 7H X O X O X O = Hub available with setscrew style X = Hub availability with clamping style Taper Hub Sizes Available 1: Code STL AL STL AL STL AL STL AL Cast Iron N.../1 X X X X X N/...1d X X X N /2 X X X X X N /2a X X X X X N /3 X X X X SAE Involute Spline Chart* (inches) Major Pitch Pitch Number Pressure Size Diameter Diameter of Teeth Angle A / / B / BB / / C / LJ / CC / / LJ / / D,E / / * Class 5 fit is standard. Flat root side fit. SAE Spline Hub Availability Size A O X X B O BB O X X O X X X X C O X X O X X X LJ2 X O X CC X O X LJ3 O D,E X X X DIN 5482 Spline Specifications Pitch Number Profile Size Diameter Module of Teeth Correction A 17 x 14 14,40 1,6 9 +0,6 A 28 x 25 26,25 1, ,302 A 30 x 27 28,00 1, ,327 A 35 x 31 31,50 1, ,676 A 40 x 36 38,00 1, ,049 A 45 x 41 44, ,181 A 50 x 45 48, ,181 DIN 5482 Spline Hub Availability Size A35 x 31 O A45 x 41 O X O X X 9

10 Coupling Installation And Misalignment Capabilities [mm] Dimensions Coupling Size G , , ,5 4 4,5 5 5,5 6 6,5 7 7,5 9 10,5 H S DIST MAX OAL Ka Kr DIST MIN Kw DIST MAX - DIST MIN Axial Displacement Radial Displacement Angular Displacement Dimensions For Displacement/Misalignment [mm] Coupling Size Max. Axial Displ. Ka 1,0 1,2 1,4 1,5 1,8 2,0 2,1 2,2 2,6 3,0 3,4 3,8 4,2 4,6 5,0 5,7 6,4 Max. Radial Displ. Kr 0,17 0,20 0,22 0,25 0,28 0,32 0,36 0,38 0,42 0,48 0,50 0,52 0,55 0,60 0,62 0,64 0,68 Kw Max angular displ. n=1500 [1/min] in deg. 1,2 1,2 0,9 0,9 1,0 1,0 1,1 1,1 1,2 1,2 1,2 1,2 1,3 1,3 1,2 1,2 1,2 Angular displ. [mm] 0,67 0,82 0,85 1,05 1,35 1,70 2,00 2,30 2,70 3,30 4,30 4,80 5,60 6,50 6,60 7,60 9,00 Set Screw Information Set Screw Size (SS) M4 M5 M5 M6 M8 M8 M8 M10 M10 M10 M12 M12 M16 M16 M20 M20 M20 Set Screw Location (t) The values regarding displacement are provided assuming normal operating conditions (i.e. temperature, torque with nominal rating of the coupling, speed/rpm rating of the coupling, and misalignment). Careful installation (i.e. alignment) and periodic inspection should be provided to provide the optimum life of the coupling. Special consideration should be given as to the position of the shafts and the amount of axial movement the coupling will be exposed to. The more accurate the alignment of the coupling, will result in greater life of the elastomer. A coupling guard and rotating equipment safety procedures should always be followed. Please consult the Lovejoy web site at for assembly instructions of the curved jaw coupling. 10

11 CJDB and CJSB Designs Features and Benefits Both curved jaw double bolt (CJDB) and single bolt (CJSB). Flange is available in steel only. CJDB Design OAL OD FD H BC LTB 1 W G LTB 1 LTB 2 BSE LTB 2 CJSB Design OAL BC FD HD* OD CJDB and CJSB Dimensional Data LTB 1 LTB 1 LTB 2 BSE Size Dimensions Capscrews CJDB/ OD FD BC H LTB BSE BSE G W LTB OAL OAL Capscrew # of Pitch Capscrew CJSB 1 (CJDB) (CJSB) 2 (CJDB) (CJSB) Size Capscrews Torque (Nm) M5 x M6 x x 45º M8 x M8 x x 22.5º M8 x M10 x x 45º M10 x x 22.5º M12 x M16 x M16 x M20 x x 18º M20 x M20 x M24 x M24 x x 15º 1000 * Please refer to page 6 for standard hub dimension HD. 11

12 CJLFH, CJDLF, CJSFH, and CJDSF Designs Features and Benefits Flange to Flange design available for applications requiring space saving, compact connections. Shaft to Flange design is also available for special application situations requiring an alternative connection. OAL OAL OAL OAL HD* PD BH P BC FD FD PD BH P BC HD* H PD P BC OD OD PD P BC W W BH W BH LTB F F G F LTB G F F G F CJLFH Design CJDLF Design CJSFH Design CJDSF Design CJLFH, CJDLF, CJSFH, CJDSF Dimensional Data CJLFH CJDLF General Dimensions Dimensions CJLFH and CJDLF Dimensions CJSFH and CJDSF CJSFH OD H LTB G W PD F FD P BC # of BH to OAL OAL P BC BH # of Pitch OAL OAL CJDSF Bolts DIN 69 (CJLFH) (CJDLF) Bolts Z x a (CJSFH) (CJDSF) Size M M6 8 8x45º M M x22.5º M M10 8 8x45º M x22.5º M M M M X18º M M M M X15º * Please refer to page 6 for standard hub dimension HD. 12

13 CJSPC and CJDSPC Designs Features and Benefits Hubs available in aluminum, sintered iron, cast iron, and steel. Spacer style features an aluminum spacer piece. Drop-out style features two inserts for increased damping and parallel misalignment capability. Center drop-out design provides easy element replacement. Designed to accommodate a larger shaft separation. OAL OAL HD* H OD HD* OD LTB G S BSE G LTB LTB G F SL F G LTB CJSPC Design CJDSPC Design CJSPC and CJDSPC Dimensional Data Max. radial displacement with 1º angular displacement and n=1500 1/min Max. radial displacement or max. angular 8.8 or 10.9 displacement i [º] Spacer for shaft distance Size OD H LTB G S BSE OAL with n=1500 1/min T kn T kmax F SL OAL dimension BSE Bolt # of T A [Nm] (CJSPC) (CJDSPC) Size Bolts BSE M BSE M BSE M BSE M BSE M BSE M BSE M BSE M BSE M * Please refer to page 6 for standard hub dimension HD. 1º 30 each hub Max. axial displacement Hexagon screws DIN

14 Curved Jaw With Taper Loc Bushing N OAL N HD OD LTB W G LTB Reverse Mount Front Mount Taper Loc Coupling Dimensions Dimensions [mm] Fixing screw for taper bushing Size Taper Tightening Clamping Size Length # of Torque Bushing LTB G W OAL N OD HD H [in] [in] screws [Nm] / / / / / /4 92 Taper Bushing Bore Reference Chart (Taper Loc Bushings Not Provided By Lovejoy) Size of taper bushes * * CJDO-DCFS and CJDCFT-GS Designs Features and Benefits Floating shaft and floating tube designs available for spanning large, between shaft end measurements. Increased parallel misalignment capacity. Easy replacement. Improved damping capacity by utilizing two spiders in assembly. 14

15 Technical Description For The GS Series The GS Series curved jaw coupling offers zero backlash capability in a 3-piece design. The coupling is provided assembled under prestress. The GS Series can be used in a variety of different applications requiring precision and accuracy. The GS Series spider features a straight center of the spider tooth, providing higher stiffness due to coupling prestress. The crowning of the ends of the spider legs allows for misalignment, while the curved jaws and solid spider center provide high-speed capability. The jaws of the hubs and the spider legs are chamfered to provide easy assembly. The GS Series coupling design also allows the blind assembly in tight spaces. Raised spider dots on the legs of the spider ensure proper spacing of hubs and spider. Proper installation of the coupling can provide isolation of electrical currents. Check the dimension listed on page 19 to ensure the proper spacing between spiders and hubs. The GS Series coupling has spiders available in four different shore hardnesses. Each spider offers benefits for different vibratory, environmental, and torque transmission requirements. Elastomer Performance Data For GS Series Sizes Spider Type Color Material Normal Maximum Available Typical Application 80 Shore A GS Blue Urethane -50 to 80 C -80 to Electric measuring systems. 92 Shore A GS Yellow Urethane -40 to 90 C -50 to Electric measuring and control systems. 95/98 Shore A Red Urethane -30 to 90 C -40 to Positioning drives, main spindle drives, high load applications. 64 Shore D GS Green Urethane -20 to 110 C -30 to High load applications requiring torsionally stiff spider material. 15

16 Coupling Selection For The GS Series Typical Applications Measurement And Control Systems The torsional stiffness of the GS Series coupling provides the needed accuracy for measurement and control systems. The low torques of these applications gives the GS Series the ability to provide zero backlash due to the elastomer pre-stress. Servo And Positioning Drives The GS Series provides a zero backlash, flexible connection for servo and positioning drives. An added benefit of the GS Series is its damping capabilities. For applications that have vibrations at critical speeds, the GS Series coupling can provide a zero backlash solution for vibration problems. Main Spindle Drives The GS Series coupling is used in main spindle drives for machine tools. Torque spikes and cyclical loading are handled by the GS Series by damping or by shifting the vibratory frequency range to a non-critical speed range. GS Series Service Factors Temperature Factor -30 to +30C +40 C +60 C +80 C K3 1 1,2 1,4 1,8 Calculation Formula Rated nominal torque Tn [Nm] = 9550 X P[kW] rpm [1/min] Torsional Stiffness Factor Main Positioning Shaft Spindle Drive Encoders, Drive Of Angle Machine Encoders K Shock Load Factors K5 Light Shock Loads 1,0 Medium Shock Loads 1,4 Heavy Shock Loads 1,8 Rotational inertia coefficient (driver) = Rotational inertia coefficient (driven) = Moment of inertia (driver) Moment of inertia (driver) + Moment of inertia (driven) Moment of inertia (driven) Moment of inertia (driver) + Moment of inertia (driven) Check the nominal torque for the application against the rating for the coupling: Tkn > Rated torque of machine x K3 x K4 Peak Torque Shock load (driver side) = Peak torque (driver) x rotational inertia coefficient (driver) x K5 Shock load (driven side) = Peak torque (driven) x rotational inertia coefficient (driven) x K5 Check the peak torque for the application against the rating for the coupling (see page 17), checking both driver and driven sides: Tkmax > Peak Torque (driver or driven side) x K3 x K4 16

17 GS Series Technical Description GS Shore - Torque Ratings Spider Maximum Speed For Torque [Nm] Static Dynamic Weight (kg) Polar Moment of GS Durometer Clamping Styles (rpm) Torsional Torsional Radial Inertia J (kgm2) Size Clamping Set Screw Locking Device Stiffness Stiffness Stiffness Hub Spider Hub Spider Hub Hub Hub T kn T kmax [Nm/rad] [Nm/rad] N/mm (x10-3 ) (x10-3 ) (x10-6 ) (x10-6 ) 80 Sh A ,0 8,0 60, ,6 2,8 0, Sh A 7,5 15,0 114, Sh A 12,5 25,0 171, Sh D 16,0 32,0 234, Sh A ,9 9,8 343, ,4 1, Sh A 10,0 20,0 573, Sh A 17,0 34,0 859, Sh D 21,0 42,0 1240, Sh A ,8 7, Sh A Sh D Sh A ,3 16, Sh A Sh D Sh A ,6 44, Sh A Sh D Sh A Sh A Sh D Sh A Sh A Sh D Sh A Sh A Sh D Sh A

18 Lovejoy GS Series Curved Jaw Couplings No backlash connections for use in machine tool applications. Finished metric bores to H7 fit. Clamp style and set screw style available. Clamping design also available for use with shaft locking device. Dimensional Data [mm] Set Screw Style Clamping Bolt Style Min- Set Bolt Max Screw Bolt Location Torque Size Material Bores OD OAL LTB G WT TH Size SL Size t t (NM) 14 Aluminum S M4 5 M3 5 1,34 19/24 Aluminum S ,0 3 3 M5 10 M ,5 24/28 Aluminum S ,0 3 3 M5 10 M ,5 28/38 Aluminum S ,5 4 4 M6 15 M /45 Aluminum S ,0 4 4 M8 15 M Steel S ,0 4 4 M8 20 M Steel S ,5 4 4 M8 20 M Steel S ,0 4,5 4,5 M10 20 M Steel S ,5 4,5 4,5 M10 20 M Lovejoy GS Series Torque Ratings [Nm] Bore sizes and corresponding torque ratings for clamping hubs with frictional locking device. Size , / / / /

19 GS Series GS Series Stock Bore Sizes Size Style KW X X X X X X X X SS X X X X X C X X X X X X X X X X X CWK X X X X X LD X X 19 KW X X X X X X X X X C X X X X X X X X X CWK X X X X X X LD X X X X X X 24 KW X X X X X X X X X DSC X X X X X X X X DSCK X X X X X X X LD X X X X X X X X X 28 KW X X X X X X DSC X X X X X X X DSCK X X X X X X X LD X X X X X X X X X X X 38 KW X X X X X X X X DSC X X X X LD X X X X X X X X X X Style Codes KW = Hub with keyway and set screw DSC = Double split clamp without keyway DSCK = Double split clamp with keyway LD = Hubs using frictional locking device CWK = Clamp hub with keyway C = Clamp hub with set screw SS = Bore and set screw only Larger Size GS Series Availability [mm] Bore Sizes Available Size Style LD X X X X X 48 LD X X X X X 55 LD X X X X X X 65 LD X X X = Stock Standard Bore 19

20 GS Series Hub Design The GS Series coupling features different hub designs for different application situations. Each type offers specific benefits for different types of applications. The clamping styles offer the benefit of minimal to zero backlash. Keyway With Set Screw (KW) Standard Lovejoy method of securing a hub to a shaft. Clamping style recommended for backlash free torque transmission. Clamping Hub With Single Slot Without Keyway (C) Zero backlash, clamping style for torque transmission. Torque capacity of hub depends on bore size. Available standard for sizes Clamping Hub With Double Slot Without Keyway (DSC) Transmits torque utilizing a double split clamp to attach hub to shaft. Zero or minimum backlash. Torque capacity of coupling determined by bore size. Available standard for sizes Without Keyway, With Set Screw (W/SS) Set screw used to secure hub to shaft. This hub design should be used in applications with nonreversing and low torque characteristics. Clamping Hub With Single Slot With Keyway (CWK) Zero backlash, clamping style with keyway for torque transmission. Usable in applications featuring reversing loads. Available standard for sizes Clamping Hub With Double Slot With Keyway (DSCK) Transmits torque utilizing a double split clamp to attach hub to shaft. Zero or minimum backlash. Available standard for sizes Hub With Frictional Locking (LD) This hub utilizes a shaft locking device to allow for shaft engagement. This design features bolts tightened on the jaw side of the hub. 20

21 GS Series Misalignment Information The GS Series coupling handles the following types of misalignment: axial, angular, and radial. The coupling retains its zero backlash properties due to its spider design. Kr Axial Misalignment Axial misalignment can be caused by different shaft tolerances or by thermal expansion of shafts. The GS Series coupling handles axial misalignment while keeping reactionary forces low. Radial Misalignment Radial misalignment can be defined as a measure of the offset distance between the centerlines of the driving and driven shafts. This type of misalignment, due to the forces involved, causes the highest stress. Angular Misalignment Angular misalignment can be defined as a measure of the angle between the centerlines of the driving and driven shafts, where those centerlines would intersect approximately halfway between shaft ends. The GS Series coupling can handle a specific amount of angular misalignment for each given size (refer to chart on right). GS Series Misalignment Table Size Spider Axial Radial Angular Shore Ka Kr KW [mm] [mm] [deg.] 80 0,21 1, ,0 0,15 1,0 98-0,5 0,09 0,9 64 0,06 0,8 80 0,15 1, ,2 0,10 1,0 98-0,5 0,06 0,9 64 0,04 0, ,14 1,0 +1,4 98 0,10 0,9-0,5 64 0,07 0, ,5 0,15 1, ,7 0,11 0,9 64 0,08 0, ,17 1,0 +1,8 98 0,12 0,9-0,7 64 0,09 0, ,19 1,0 +2,0 98 0,14 0,9-1,0 64 0,10 0, ,23 1,0 +2,1 98 0,16 0,9 1,0 64 0,11 0, ,24 1, ,17 0,9-1,0 64 0,12 0, ,6-1,0 0,18 0,9 21

22 Product Warranty Lovejoy, Inc. warrants all products it manufactures to be of good material and workmanship and to be free of defects if properly installed and operated. REMEDY FOR BREACH OF THIS WARRANTY IS EXPRESSLY LIMITED TO REPLACEMENT OF DEFECTIVE PARTS, AS HEREINAFTER SET FORTH, LOVEJOY EXPRESSLY DISAIMS ALL AIMS FOR INCIDENTAL AND CONSEQUENTIAL DAMAGES ARISING FROM ANY BREACH OF THIS WARRANTY. Any product which, under normal use and service, is proven to breach the warranty contained herein within ONE YEAR from date of sale will, upon examination by Lovejoy, be replaced. All freight shall be for buyer s account. In all cases, transportation costs and charges for returned goods shall be paid for by the purchaser, Lovejoy hereby disclaims all responsibility for such transportation cost and charges. This warranty will not be breached, and Lovejoy will give no credit for products it manufacturers which shall have received normal wear and tear, been damaged, improperly installed, repaired or altered outside of Lovejoy s factory. THE ABOVE-DESCRIBED WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, AND ALL OTHER WARRANTIES ARE HEREBY EXPRESSLY DISAIMED, INUDING WITHOUT LIMITATION THE IMPLIED WARRANTY OF MERCHANTABILITY AND THE IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. LOVEJOY EXPRESSLY DISAIMS ALL LIABILITY FOR SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES, WHETHER ARISING IN TORT OR BY CONTRACT. LOVEJOY FURTHER DISAIMS ALL LIABILITY FROM PERSONAL INJURY RELATING TO ITS PRODUCTS TO THE EXTENT PERMITTED BY LAW. BY ACCEPTANCE OF ANY OF LOVEJOY S EQUIPMENT OR PRODUCTS, THE PURCHASER ASSUMES ALL LIABILITY FOR THE CONSEQUENCES ARISING FROM THEIR USE OR MISUSE. NO PERSON, FIRM OR CORPORATION IS AUTHORIZED TO ASSUME FOR LOVEJOY ANY OTHER LIABILITY IN CONNECTION WITH THE SALE OF ITS PRODUCTS. FURTHERMORE, NO PERSON, FIRM OR CORPORATION IS AUTHORIZED TO MODIFY OR WAIVE THE TERMS OF THIS PARAGRAPH, AND THE PRE- CEDING PARAGRAPH, UNLESS DONE IN WRITING AND SIGNED BY A DULY AUTHORIZED AGENT OF LOVEJOY. Note: Specifications are subject to change without notice, and without liability therefore. Lovejoy is a registered trademark of Lovejoy, Inc. All other trademarks, brands, and names are the property of their respective owners. 22