RINGFEDER Locking Assemblies GB 03 04 Catalogue RfN 7014 For high torques & axial loads
RINGFEDER Locking Assemblies RfN 7014 Please note that our guarantee refers to our products only. Because of the unlimited number of applications and all different types of machines, it is not possible for our engineers to know all factors that may affect or change the technical data or our products. This publication may not be reproduced, either partly or wholly, without the source being quoted. We reserve the right to modify design by way of technical improvement. Certified by DIN EN ISO 9001 and DIN EN ISO 140001 and ISO/TS 16949 2
RINGFEDER Locking Assemblies RfN 7014 For highly stressed shaft-hub connections the shrink fit is unsurpassable. No other shaft-hub connection can offer anywhere near the same performance regarding fatigue stress under alternating torsional loads. However, the traditional shrink fit has drawbacks, as they call for involved calculations and extremely close machining tolerances. The fitting and removal of these connections is difficult, subsequent adjustment can be impossible. The connection using a RINGFEDER RfN 7014 Locking Assembly is a shrink fit but a shrink fit of a special kind. With all the advantages and none of the disadvantages. CHARACTERISTICS Fig. 1 Locking Assembly RINGFEDER RfN 7014 HIGH TRANSMISSION FORCES UNLIMITED RANGE OF APPLICATIONS OPTIMUM DEPENDABILITY SIMPLIFIED MANUFACTURING GOOD CENTERING ABILITY EASY MOUNTING EASY REMOVAL HIGH FATIGUE STRENGTH UNDER ALTERNATING TORSIONAL STRESSES OVERLOAD PROTECTION EASY ADJUSTABILITY PERFECT TRUE RUNNING EASY CALCULATION Due to the narrow cone angles high torques & axial forces can be transmitted. RfN 7014 Locking Assemblies are suitable for securing all types of bosses and hubs onto shafts and axles. Replacing traditional shrink fits, key and polygon connections, splined shafts etc. We guarantee the torque/axial load transmission values as given in this publication, regardless of whether the connection is subjected to static, dynamic or impact loads. However, the values given in this catalogue must not be exceeded. Locking Assembly connections only require plain shaft and bore diameters, no additional components or machining of steps, slots, threaded holes, etc. is necessary. Also due to the RfN 7014 Locking Assembly design, hubs can be manufactured with through bores, depending on the centering accuracy required. Due to the relatively wide design (giving increased guiding lengths) RfN 7014 Locking Assemblies centre better than the standard series RfN 7012. Hubs can be located at any point on the shaft and adjusted to precise angles. The RfN 7014 Locking Assembly uses a few standard cap headed screws tightened to a specific torque value. The RfN 7014 Locking Assembly is released using the locking screws in the threaded jacking hole positions. No additional measures or auxiliary devices are required. A small shoulder on the shaft or in the hub bore is required for releasing (please refer to page 7). As neither the shaft or hub feature grooves the notch effect is minimised giving a higher polar section modulus. When the admissible load is exceeded the Locking Assembly will slip. In this way they protect valuable machine components against damage. However, Locking Assemblies are subject to the same laws as all other friction connections and are not suitable for use as slipping clutches. The Locking Assembly connection can be adjusted at any time by following removal and fitting instructions. There is no play or fretting wear with a RfN 7014 Locking Assembly friction connection. This catalogue lists all relevant data in the form of quick-reference tables. 3
Locking Assemblies RINGFEDER RfN 7014 Locking Assembly designation for shaft diameter d = 70 mm: Locking Assembly RINGFEDER 70 x 120 RfN 7014 Locking Assembly dimensions Surface Pressure Locking screws DIN 912 12.9 Transmissible between Locking torques axial Assembly and Releasing forces shaft hub Thread threads d x D L l L 1 T or F ax p p Qty. d G Qty. T A mm mm Nm kn N/mm 2 Nm kg 70 x 120 62 56 74 6850 197 201 117 8 M 12 x 55 4 145 3,3 80 x 130 62 56 74 11650 291 263 162 12 M 12 x 55 4 145 3,7 90 x 140 62 56 74 13000 290 234 150 12 M 12 x 55 4 145 4 100 x 160 80 74 94 19700 389 213 133 12 M 14 x 70 4 230 7,2 110 x 170 80 74 94 26600 483 242 157 14 M 14 x 70 4 230 7,7 120 x 180 80 74 94 28900 482 222 148 15 M 14 x 70 5 230 8,3 130 x 190 80 74 94 31200 480 205 140 15 M 14 x 70 5 230 8,8 140 x 200 80 74 94 40200 574 227 159 17 M 14 x 70 5 230 9,3 150 x 210 80 74 94 42900 572 212 152 18 M 14 x 70 6 230 10 160 x 230 94 88 110 64000 800 227 158 17 M 16 x 80 5 355 14,9 170 x 240 94 88 110 67800 795 214 152 18 M 16 x 80 6 355 15,7 180 x 250 94 88 110 83000 923 235 170 20 M 16 x 80 5 355 16,4 190 x 260 94 88 110 88000 921 223 163 21 M 16 x 80 6 355 17,2 200 x 270 94 88 110 105000 1050 242 179 23 M 16 x 80 5 355 18,8 220 x 300 116 110 134 123000 1120 189 138 21 M 18 x 100 6 485 27,7 240 x 320 116 110 134 153000 1280 198 148 24 M 18 x 100 6 485 29,8 260 x 340 116 110 134 186000 1430 205 157 26 M 18 x 100 6 485 32 280 x 370 136 130 156 230000 1650 192 145 24 M 20 x 120 6 690 46 300 x 390 136 130 156 245000 1650 179 138 24 M 20 x 120 8 690 49 Weight Explanations d x D, L, l, L 1 = Basic dimensions, Locking Assemblies not tightend d G = Clamping/releasing thread T = Transmissible torque F ax = Transmissible axial force p = Maximum surface pressure between Locking Assembly and shaft p = Maximum surface pressure between Locking Assembly and hub T A = Maximum tightening torque for the screw considered in order to determine the values T, Fax, p and p Mounting of Locking Asembly The values for T, F ax, p and p apply to Locking Assemblies installed in an oiled condition. for further details see page 6. Surface finishes For shaft and hub bores: R a 3,2 µm. Corresponds to RMS 125 micro-inches. Tolerances We do not stipulate any particular tolerances. The following may be taken as guide values: Shaft: All clearances between h9 and k9. Hub: All clearances between N9 and H9. In order to avoid impairments of functioning, the clearances chosen for shaft and hub must permit a correct and symmetric clamping, i.e. if the shaft is smaller than nominal d, the bore should be accordingly greater than nominal D and vice versa. Location of several Locking Assemblies RfN 7014 Two Locking Assemblies at most can be installed in series. In this case the transmission values of the above table will double. Change of screw tightening torques A reduction of the contact pressures and the transmission values by reducing the tightening torque of the screws is possible. The admissible lower limit results from the multiplication of the T A values of the above table by 0,8. Fig. 2 There is an approximate linear relationship between T A, T, F ax, p and p (hub and hollow shaft calculation according to the equations on page 5)! 4
Locking Assemblies RINGFEDER RfN 7014 Hub outside diameter D N as a factor of the yield point (minimum theoretical values) chosen R p0,2n (N/mm 2 ) 200 220 250 270 300 350 400 450 500 d x D p D N mm N/mm 2 mm 70 x 120 117 197 187 176 171 165 158 154 150 148 80 x 130 162 287 247 231 215 199 189 182 177 90 x 140 150 309 274 245 232 219 205 196 190 185 100 x 160 133 311 285 261 250 238 225 216 210 206 110 x 170 157 457 381 326 305 283 261 248 238 232 120 x 180 148 419 366 323 305 287 267 255 246 240 130 x 190 140 395 356 322 307 291 273 262 254 249 140 x 200 159 552 455 388 362 336 309 293 281 273 150 x 210 152 517 444 388 365 341 316 301 290 283 160 x 230 158 541 455 423 391 359 339 326 316 170 x 240 152 617 522 451 423 395 365 347 334 325 180 x 250 170 552 501 455 410 384 367 354 190 x 260 163 658 539 496 455 415 390 374 362 200 x 270 179 662 586 521 462 429 407 392 220 x 300 138 654 648 519 495 468 438 417 405 396 240 x 320 148 803 685 595 560 522 483 461 445 432 260 x 340 157 830 687 636 588 537 507 486 470 280 x 370 145 930 792 688 648 603 559 533 515 500 300 x 390 138 878 772 687 652 612 574 546 531 515 Explanations The values apply to: One Locking Assembly RfN 7014, fitted using oil B b + k; b L 1 ; k L 1 - L Calculation according to the following equations: where R p0,2n is the yield point of the hub material and p red the surface pressure reduced to the zone of stress L 1, i. e.: For hubs with B b + k, but a minimum width B = L, you must choose p for the preceding formulas instead of p red. If two Locking Assemblies are used in series, the values of the above table also apply if the dimensions b and B are increased by L 1. Shaft calculation (minimum requirements) a) Applicable to solid shafts is: R p0,2w p b) The admissible maximum bore diameter of a hollow shaft results from the following formula: The following empirically determined relationship applies to the form factor c: where R p0,2w is the yield point of the shaft material and p red the surface pressure reduced to the zone of stress L 1. The required yield point of the hub material or the admissible surface pressure are to be determined according to the following formulas (units of meassure see table on pages 4 and 5): Fig. 3 5
Locking Assemblies RINGFEDER RfN 7014 Installation and removal instructions Installation Since the force is transmitted by contact pressure and friction between the functional surfaces, the condition of the contact surfaces and correct tightening of the locking screws are of great importance (see point 2). 1. When originally packed, Locking Assemblies are fitted with small metal packing pieces located in the slits of the inner and outer rings. These are for shipping purposes only and MUST be removed prior to installation. 2. All contact surfaces, including screw threads and screw head bearing surface, must be clean and slightly oiled (do not use molybdenum disulphide). In this condition, the shaft, hub, and Locking Assemblies are to be assembled. 3. Tighten locking screws lightly and align hub. 4. Tighten screws evenly in diametrically opposite sequence and do this in two or three stages up to the indicated final tightening torque (TA). Removal The Locking Assemblies RfN 7014 are to be removed as follows: 1. Loosen all screws by a few threads. 2. Remove the screws adjacent to each threaded release hole and screw them into these holes. Since the rear thrust ring rests against either shaft or hub shoulder, the jack screws will automatically push apart both tapers, thus releasing the connection. 3. The connection can be either re-adjusted or dis-assembled. Remove the jack screws only after the Locking Assembly has been taken out of the hub. Used Locking Assemblies have to be replaced and slightly oiled prior to reinstallation. Note that the release threads of the of the front thrust ring have to be positioned opposite to undrilled spaces of the rear thrust ring. These threads are used for removal. 5. Re-check tightening torque by applying it to all the screws. When no screw turns any more, the assembly is completed. Fig. 4 Locking Assembly not tightened Fig. 5 Locking Assembly with a screw in one of the realease threads 6
Locking Assemblies RINGFEDER RfN 7014 Construction hints / Construction examples Fig. 6 Arrangement of a Locking Assembly RfN 7014 supported by the hub. Fig. 7 For hubs with comparatively small outside diameters it is recommended to step the shaft in order to obtain a sufficient hub section above the Locking Assembly (support by he hub). Fig. 8 Arrangement of a Locking Assembly RfN 7014 supported by the shaft. Fig. 9 In the case of straight through hub bores and shafts without steps or shoulders, it must be possible to push the rear thrust ring of the Locking Assembly against another construction part in order to release the assembly. Fig. 10 Venturi nozzle for the gaspurifying, converter. Flap fastening Locking Asemblies 90 x 140 RfN 7014 Messrs. BAUMCO, Essen Fig. 11 Rolling crusher Fastening of a gearwheel with a Locking Assembly 160 x 230 RfN 7014 Messrs. Hazemag, Münster 7
Material standards selection Hints for material specifications and according values of yield strength replaced by aproximate range DIN DIN EN designation of yield point* N/mm 2 seamless tubes 1629 for 215 up to 355 special requirements cast steel 1681 for 200 up to 300 common use Beibl. 1 1691 cast iron 98 up to 228 (0,1 limit of elongation) 1692 malleable cast iron 200 up to 530 1693 spheroidal graphite cast iron 250 up to 500 copper - tin 1705 and 90 up to 180 copper - tin - zinc - alloys 1725 575 aluminium alloys 70 up to 380 17100 10025 structural and constructural steels 175 up to 365 17200 10083 heat-treatable steel 300 up to 560 17245 ferritic creep resistant cast steel 125 up to 540 17440 stainless steels 185 up to 600 * dependent on quality, kind of product and intended use 8
ISO-tolerances for shafts and bores Allowances in µm (1 µm = 39.37 µin) 9
Technical service Based on your technical drawings and data we are ready to execute installation proposals to solve your specific problems. Many years of experience and modern calculation methods open extraordinary possibilities of assistance. Certified
Fax enquiry For technical assistance +49 (0) 2151 835 200 or 207 To: RINGFEDER VBG GMBH, department MV From: Messrs.:......... contact:... department:... address:......... phone:... fax:... To make it easier for our technical staff and to avoid errors or mistakes your enquiry should include the following information: Information for technical service Expected maximum loads: Max. torque T g max. = Nm Max. bending moment M g max. = Nm Max. axiall load F g max. = kn Max. radial load F r max. = kn Dimensionens, materials: shaft diameter d W = mm In case of hollow shaft, internal diameter d B = mm Speed/revolutions n = 1/min Hub outside diameter D N = mm Hub width B = mm Hub material/yield strength R p0,2n = N/mm 2 Shaft material/yield strength R p0,2w = N/mm 2 Temperature at the connection Temp. = C Additional information:............ Please send a drawing or sketch together with your enquiry! RINGFEDER VBG GMBH Oberschlesienstr. 15 D-47807 Krefeld P.O.Box 130619 D-47758 Krefeld Phone +49 (0) 2151-835-0 Fax +49 (0) 2151-835-200/207 http://www.ringfeder.de e-mail: info@ringfeder.de RINGFLEX Drive Systems Limited Unit 34, Vauxhall Industrial Estate Greg Street, Reddish GB Stockport SK5 7BR Phone (0161) 4740464 Fax (0161) 4290272
For shaft-hub connections we supply: RINGFEDER Locking Assemblies RfN 7012........... for highly stressed shaft-hub connections and big machining tolerances RINGFEDER Locking Assemblies RfN 7012-IN......... for shafts with inch-dimensions RINGFEDER Locking Assemblies RfN 7013........... for higher demands to concentricity RINGFEDER Locking Assemblies RfN 7013-IN......... for shafts with inch-dimensions RINGFEDER Locking Assemblies RfN 7014........... for extremely stressed shaft-hub connections RINGFEDER Locking Assemblies RfN 7015.......... self-centering, for highest transmission values as well as for the use in belt drums RINGFEDER Locking Assemblies RfN 7110.......... compact dimensions, excellent centering ability RINGFEDER Locking Elements RfN 8006............ adaptable design for special requirements RINGFEDER Shrink Discs....................... for external Clamping RfN 4071 / 4091 / 4051 / 4073 / 4171 RINGFEDER Shaft Couplings..................... for an absulutly rigid connection of shafts and high accuracy of alignment Special designs.............................. on request Torque wrenches and accessories.................. for correct tightening Also available from RINGFEDER VBG GMBH: Damping Elements, such as RINGFEDER Friction Springs designed to absorb high energies at relatively compact dimensions, DEFORM plus - non-reusable, one-hit shock absorbing elements, made of synthetic material or steel, DEFORM plus R - reuseable damping elements. Trailer Couplings and accessories for road transport and special vehicles. 2004-03 This publication may not be reproduced, either partly or wholly, without the source being quoted. Certified in accordance with DIN EN ISO 9001 and DIN EN ISO 140001 and ISO TS 16949 RINGFEDER products are available from MARYLAND METRICS