Shaft Couplings Tru-Line Flange-Couplings Rigid Shaft Couplings Flexible Couplings
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1 Shaft Couplings Tru-Line Flange-Couplings Rigid Shaft Couplings Flexible Couplings Edition 2015/2016 RINGSPANN Registered Trademark of RINGSPANN GmbH, Bad Homburg
2 Table of Contents Tru-Line Flange-Couplings Page Tru-Line Flange-Couplings RFK with backlash free cone-clamping-connections 4 Rigid Shaft Couplings Page Rigid Shaft Couplings RWK 500 for backlash free connection of two shaft ends 6 Flexible Couplings Page Flexible Couplings L 8 Flexible Couplings L Hubs with keyways 10 Flexible Couplings LK Hubs with backlash free clamping connections 11 Flexible Couplings LF Flange connection 12 Flexible Couplings LA Flange connection and hubs with keyway 13 Shaft Couplings technology details Page Questionnaire for RINGSPANN Tru-Line Flange-Couplings RFK 14 RFK RWK L LK LF LA Issue 06/ We reserve the right to make technical modifications. 3
3 Tru-Line Flange-Couplings RFK with backlash free cone-clamping-connections Features Compact design Small axial space required for installation Fast disassembly for minimal downtime High shaft tolerance h8 permissible No weakening of shafts by feather keys No fretting corrosion as with keyway connections Proven solution in many applications, particularly in mining 4-1 Applications A rigid and easy to disassemble shaft coupling solution for: Conveyor belts Elevators Bucket elevators Escalators and moving walkways Many other applications Application Tru-Line Flange-Couplings RFK are particularly suitable for coupling freely suspended motor gear units on a rocker with a support. However, they can neither compensate radialangle nor axial shaft misalignments. If this is required, then please use the Flexible Couplings L described from page 8 onwards. Tru-Line Flange-Coupling RFK 350 F M connects the gear of the drive unit to the head drum of an iron ore conveyor belt system in South Africa 4-2 Transmissible s The transmissible s listed on page 5 are subject to the following tolerances, surface characteristics and material requirements. Please contact us in the case of deviations. Tolerances h8 for shaft diameter d h8 for shaft diameters d F or d M Surfaces Average surface roughnesses at the contact surfaces of the shafts R z = µm. Materials We will be happy to recoend suitable shaft materials taking DIN 743 as a basis (12/2012 edition). In doing so we will take the surface pressures prescribed for the Tru-Line Flange- Couplings RFK into account. Simultaneous transmission of, axial force and bending moment Where there are axial forces and/or bending moments in the application in addition to the M A, the transmissible is reduced compared to the values for M as listed in the tables. We will select the proper coupling for each application based upon the allowed transmissible under existing bending moment conditions. Our selection calculations are in accordance with the latest scientific knowledge and know how in the industry and include the proper safety factor to prevent fretting corrosion. Please contact us. 4
4 Tru-Line Flange-Couplings RFK with backlash free cone-clamping-connections N F F F M G + 5 H M G Y ø K R Z H F ø B ø d F h8 L ø C F7 ø T ø D ø C -0,01-0,032 ø d M h8 Inside-centred Coupling Half Outside-centred Coupling Half 5-1 Tru-Line Flange- Coupling RFK Size Coupling Half insidecentred outsidecentred 50 F 50 M 70 F 70 M 90 F 90 M 115 F 115 M 140 F 140 M 170 F 170 M 210 F 210 M 211 F 211 M 250 F 250 M 270 F 270 M 290 F 290 M 320 F 320 M 350 F 350 M Shaft d F or d M min. 25 max. 50 min. 50 max. 70 min. 70 max. 90 min. 95 max. 115 min. 115 max. 140 min. 140 max. 170 min. 170 max. 210 min. 170 max. 210 min. 210 max. 250 min. 250 max. 270 min. 270 max. 290 min. 290 max. 320 min. 320 max. 350 transmissible B C D F F F M G H F H M K L N R T Connection screws Clamping screws Weight M Nm x M 12 x x M x M 14 x x M x M 16 x x M x M 24 x x M x M 24 x x M x M 30 x x M x M 30 x x M x M 30 x x M x M 30 x x M x M 30 x x M x M 30 x x M x M 30 x x M x M 30 x x M Paired coupling halves of the same color can be interchanged due to matching flange patterns. The maximum s of the smaller coupling half apply. * Number of connection screws Y in accordance DIN EN ISO 4014 property class 10.9 or 12.9 for RFK 50 on pitch circle T. Tightening Y* Z Nm Tightening Nm kg 7,5 6, Example for ordering Tru-Line Flange-Coupling RFK with inside-centred coupling half for shaft diameter 210 and outside-centred coupling half for shaft diameter 140 : RFK 210 F M, d F = 210, d M = 140 Mounting Please request our installation and operating instructions for Tru-Line Flange-Couplings RFK. 5
5 Rigid Shaft Couplings RWK 500 for backlash free connection of two shaft ends Features Compact design Easy to release For shaft diameters between 14 and 100 Rigid and backlash free connection of shaft ends No weakening of shafts by feather keys No fretting corrosion as with keyway connections Transmission of s and axial forces 6-1 Application example Simple and cost-effective connection of two shaft ends with a Rigid Shaft Coupling RWK 500. Shaft coupling RWK 500 (for smaller s and larger axial mounting distances) is particularly suitable for coupling freely suspended motor gear units on a rocker with a support. However, they can neither compensate radialangle nor axial shaft misalignments. If this is required, then please use the Flexible Couplings L described from page 8 onwards. 6-2 Transmissible s and axial forces The transmissible s and axial forces listed on page 7 are subject to the following toler - ances, surface characteristics and material requirements. Please contact us in the case of deviations. Tolerances h8 for shaft diameter d Surfaces Average surface roughnesses at the contact surfaces of the shafts R z = µm. Materials The following apply to the shaft and the hub: E-module 170 kn/ 2 Simultaneous transmission of and axial force The transmissible s M which are shown in the tables apply for axial forces F = 0 kn and con versely, the indicated axial forces F apply to s M = 0 Nm. If and axial force are to be transmitted simultaneously, the transmissible and the transmissible axial force are reduced. Formula symbols M = transmissible according to table [Nm] M A = M red = Maximum actual application [Nm] Reduced [Nm] For a given axial force F A, the reduced M red is calculated as: ßßßßßß M red =! M 2 d - (F A ) 2 2 For a given M A, the reduced axial force F red is calculated as: F red = 2 d! ßßßß M 2 - M 2 A F A = Maximum actual application axial force [kn] F red = Reduced axial force [kn] d = Shaft diameter [] 6
6 Rigid Shaft Couplings RWK 500 for backlash free connection of two shaft ends B L 2 L 1 L 1 ø D ø d ø d h Size d transmissible or axial force M Nm F kn Clamping screws D B L 1 L 2 Weight Tightening Number Size Length M S Nm kg M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M , M ,00 Bending moments Where there are bending moments in the application in addition to the M A or the axial force F A, the transmissible or transmissible axial force is reduced compared to the values for M or F as listed in the tables. Please contact us. Example for ordering Rigid Shaft Coupling RWK 500 for shaft diameter d = 50 : RWK 500, d = 50 Mounting Please request our installation and operating instructions for Rigid Shaft Coupling RWK
7 Flexible Couplings L Features Compact design Small dimensions Electrical insulation No stick-slip action Large radial shaft misalignment permissible For angular misalignments of up to 3 Torsionally rigid Minimal restoring forces on adjacent machine parts 8-1 with keyway with clamping hub with flange connection with keyway with clamping hub with flange connection Configuration The RINGSPANN Flexible Couplings are based on the proven Oldham principle. They consist of a flexible disc made of highly wear-resistant plastic resin and two coupling halves made of steel or spherical graphite iron. Different coupling solutions can be achieved by combining different coupling halves (see Fig. 8-2). The robust design of only three basic elements guarantees excellent reliability and easy mounting. The driving dogs of the two hubs engage by sliding into corresponding slots of the flexible disc, the slots being offset by 90, thereby compensating very large parallel misalign - ments of the shafts, if necessary. Furthermore, the support dogs - offset by 90 to the driving dogs - can compensate angular misalignments of up to 3. The rotation movement is always transmitted angle true. The particularly large, low-stress transmission surfaces are not subject to any elastic distortion or play and therefore no fatigue. Driving dogs and flexible disc should be greased with graphite paste or molybdenum disulphide as recoended in the operating instructions. This is not necessary if the couplings run in oil. Care must be taken that the Flexible Couplings are not affected by undue axial forces caused, for example, by heat expansion of the shafts. If necessary, the coupling has to be mounted with axial tolerance between support dogs and flexible disc. Possible combinations of different coupling halves 8-2 8
8 Flexible Couplings L Selecting the size of the Flexible Coupling The size of the Flexible Coupling is selected on the basis of the maximum load according to the familiar formula: M L = 9550 P/n [Nm] In this formula: M L = Load of driven machine [Nm] P = Power required for driving the machine, which is in most cases lower than the nominal power of the motor [kw] n = Coupling speed [min -1 ] The load requirement M L calculated according to this formula is an average value, but in reality the transmitted M through the coupling is irregular, according to the irregular - ity of the driving power and the machine. The maximum peak of the drive, the selection M A, should be lower than the transmissible M of the selected coupling according to the table. M A < M Where the precise irregularities of the, thus the selection M A are not known a service factor f should be applied: M A = 9550 P/n f [Nm] This factor f is dependant on the type of drive and type of driven machine, refer to table below. In this formula: M A = Selection [Nm] f = Service factor Service factor f Type of driven machine Driven by Belt drives, electric motors Combustion engines 4 and 6 cylinders Combustion engines 2 and 3 cylinders, single cylinder, steam engines Single cylinder combustion engines Belt drives, small generators, small ventilators, rotary blowers 1,5 1,7 1,9 2,2 Small hoists, larger ventilators, light machines for metal, wood and textile, small conveyors 1,8 2,0 2,2 2,5 Hoists for heavy loads, heavier conveyors, hanging conveyors, mixers, textile machines with high inertias 2,0 2,2 2,4 2,7 Presses, sheers, stumping machines, reciprocating pumps, calendars, pan grinders, haer mills 2,5 2,7 2,9 3,2 Welding generators, stone crushers, pinch roll drives, reciprocating compressors and reciprocating pumps without flywheels, rolling mills 3,0 3,2 3,4 3,7 9
9 Flexible Couplings L Hubs with keyways with keyway with keyway 10-1 Technical Data and Dimensions Coupling size M Nm speed min -1 Inertia J kgm 2 parallel misalign - ment L ,0001 0,50 4, M ,10 L ,0002 0, M ,20 L ,0003 0, , ,5 M ,38 L ,0004 1, M ,78 L ,0008 1, M ,70 L ,0013 1, M ,90 L ,0039 2, M ,70 L ,0097 2, M ,30 L ,0268 3, M ,10 L ,1110 4, M ,90 L ,2911 5, M ,90 L ,9767 7, M ,00 * Hub lengths F 1 and F 2 can be shortened with corresponding changes to dimensions A, C and L. Rough bore d 1 or d 2 Finished bore d 1 or d 2 min. max. A B C D E F* G L O Weight with rough bore kg Please specify when ordering: Whether supply is required with rough bores as per catalogue or finished bored. If finish bored, give diameters d 1 and d 2. Tolerance of finished bores is H7. Keyways as per DIN 6885, p. 1. Example for ordering Flexible Coupling L 90 with finished bore d 1 55 and finished bore d 2 87 : L 90, d 1 = 55, d 2 = 87 10
10 Flexible Couplings LK Hubs with backlash free clamping connections L F O F ø E ø d1 ø d2 ø D with clamping hub with clamping hub 11-1 Technical Data and Dimensions Coupling size M Nm speed min -1 Inertia J kgm 2 parallel misalign - ment min. Finished bore d 1 or d 2 max. LK ,0001 0, ,10 LK ,0002 0, ,20 LK ,0003 0, , ,38 LK ,0004 1, ,78 LK ,0008 1, ,70 D E F L O Weight with rough bore kg Please specify when ordering: If finish bored, give diameters d 1 and d 2. Tolerance of finished bores is H7. Example for ordering Flexible Coupling LK 16 with finished bore d 1 8 and finished bore d 2 15 : LK 16, d 1 = 8, d 2 = 15 11
11 Flexible Couplings LF Flange connection with flange connection with flange connection 12-1 Technical Data and Dimensions Coupling size M Nm speed min -1 Inertia J kgm 2 parallel misalign - ment B LF ,0009 1, , , ,5 M 6 1 0,7 LF ,0026 2, , , ,5 M 6 2 1,4 LF ,0053 2, , , ,5 M 8 2 1,9 LF ,0051 2, , , ,0 M 8 3 1,7 LF ,0138 3, , , ,5 M ,2 LF ,0453 4, , , ,0 M ,0 LF ,1314 5, , , ,0 M ,3 LF ,5203 7, , , ,0 M ,2 1) Arrangement of fastening holes for screws Z (DIN EN ISO 4762) on pitch circle T. The hole pattern on the other coupling half is rotated by 90. D H L M H7 N O P R T W Z Hole pattern 1) Weight with rough bore kg Hole pattern 1 Hole pattern 2 Hole pattern 3 Hole pattern 4 Example for ordering Flexible Coupling LF 110: LF
12 Flexible Couplings LA Flange connection and hubs with keyway with flange connection with keyway 13-1 Technical Data and Dimensions Coupling size M Nm speed min -1 Inertia J kgm 2 parallel misali gn - ment Rough bore d Finished bore d min. max. LA ,0011 1, M 8 50,0 76, ,5 65 3,5 M 6 1 1,3 LA ,0032 2, M 8 61,0 90, ,5 75 4,5 M 6 2 2,6 LA ,0075 2, M 10 71,5 105, ,5 88 4,5 M 8 2 4,1 LA ,0074 2, M 10 71,5 105, , ,0 M 8 3 4,0 LA ,0203 3, M 12 90,0 131, , ,5 M ,7 LA ,0782 4, M , , ,0 M ,0 LA ,2113 5, M , , ,0 M ,6 LA ,7485 7, M , , ,0 M ,6 Keyways as per DIN 6885, p. 1. * The hub length F can be shortened with corresponding changes to dimensions A, C, K and L. 1) Arrangement of fastening holes for screws Z (DIN EN ISO 4762) on pitch circle T for coupling half with flange connection. A B C D E F* G K L M H7 N O P T W Z Hole pattern 1) Weight with rough bore kg Hole pattern 1 Hole pattern 2 Hole pattern 3 Hole pattern 4 Please specify when ordering: Whether supply is required with rough bore as per catalogue or finished bore. If finished bore, give diameter d. Tolerance of finished bore is H7. Keyway as per DIN 6885, p. 1. Example for ordering Flexible Coupling LA 90 with finished bore 50 : LA 90, d = 50 13
13 Questionnaire for RINGSPANN Tru-Line Flange-Couplings RFK Please photocopy or use the PDF-File from our website! Company: Address: Phone: Fax: Department: Name: Enquiry Ref.: Date: 1. Where will the Tru- 1.1Type of machine, machine group or installation: 1.2 Drawing of the coupling with dimensions Line Flange-Couplings of journals of the shafts be used? ø d 1 ø d 2 2. Operating data Drive power P n [kw] shaft speed n M [min -1 ] Nominal M N [Nm] M max [Nm] Minimum safety factor S min [1] Installation conditions Outside In a closed room Temperature range from [ C] to [ C] bending moment M b [Nm] radial force F rad [N] axial force F ax [N] 3. Dimensions Shaft 1/Flange 1 Shaft diameter d 1 [] Shaft material Shaft tolerance T 1W [] Average surface roughness R z1 [µm] Shaft 2/Flange 2 Shaft diameter d 2 [] Shaft material Shaft tolerance T 2W [] Average surface roughness R z2 [µm] 4. Estimated Pieces (one-off) Pieces/month Pieces/year requirements 5. Enclosures Specifications Data sheet Sketch/drawing 14
14 Questionnaire for RINGSPANN Tru-Line Flange-Couplings RFK To be filled out in addition when using motor gear unit on rocker Please photocopy or use the PDF-File from our website! Company: Address: Phone: Fax: Department: Name: Enquiry Ref.: Date: Tru-Line Flange-Couplings RFK are primarily used in conveyor systems where the drive unit is compactly arranged on a rocker with a support or similar mechanisms. Here, bending moments are applied in the shafts on both sides of the Tru-Line Flange-Coupling. These are caused by the reaction force of the drive in the support and the weight of the rocker. In order to avoid fatigue failures of these shafts, a suitable verification calculation is to be performed, in accordance for example with the state of the art of DIN 743, 2012 edition. We will be happy to assist you with this, but we do need the questionnaire to be filled out completely first. g d Gw b a e c 2.1 Addition to If the installation conditions are different, please send us a description and drawing. operating data We will be happy to look at these and make suggestions. 3.1 Addition to Distance to the support a [] dimensions e [] Distance to the bearing d [] Distance to the centre of gravity b c [] [] Angle g [ ] Total weight G W [kg] 15
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