Contents 3 The clever connection 4 The OK coupling explained 6 OKC OKC OKC OKC OKC OKF

Transcription

1 OK haft coupling

2 2 Content 3 The clever connection 4 The OK coupling explained 6 OKC OKC OKC OKC OKC OKF OKF OKCS OKTC Tailor-made OK coupling 15 Power tranmiion capacity 15 Safety factor 16 Shaft 16 Converion table 17 Hollow haft for OKC 17 Hollow haft for OKCS and OKF 18 Modular equipment for mounting and dimounting 20 Oil 20 pproved by leading claification ocietie 21 Locating device for outer leeve 21 Mounting arrangement for OKC coupling 22 The Supergrip bolt cut down on downtime

3 The clever connection When uing the OK coupling for haft connection, you take advantage of our powerful oil injection method. Preparation of the haft i imple. No keyway to machine, no taper and no thrut ring. When mounting the OK coupling, a thin inner leeve with a tapered outer diameter lide onto the haft. thick outer leeve with a matching tapered inner urface fit onto the inner leeve. Ordinary mineral oil i then injected between the leeve. built-in hydraulic jack drive the outer leeve up the taper of the inner leeve. When the outer leeve ha reached it final poition an interference fit i created jut a if the outer leeve had been heated and hrunk on. But no heat i required, and the coupling can be removed a eaily a it wa mounted. Thi powerful ue of friction enable the OK coupling to tranmit torque and axial load over the entire area of the haft. There are no tre raier at the keyway. nd no fretting when high hock or revering load exit. Make it the clever way! Let the OK coupling work for you. You ll ave both time and money! 3

4 The OK coupling explained With the OKC and OKF coupling SKF preent benefit impoible to achieve with traditional coupling. The implicity of mounting and dimounting and the high torque tranmiion capacity characteried by the OK coupling are achieved uing a powerful friction joint. The five tage below illutrate the principle. Up to 2005 more than 36,000 coupling have been delivered for ue in many variou application. The OKC coupling (ee figure 1 on page 5) ha been on the market ince the early 40. OKC coupling are the tandard with many well-known controllable pitch propeller manufacturer in the world, but are alo ued for other application uch a rolling mill, pump, dieel engine, etc. The OKCS coupling evolved from a pecial deign for engine builder where the torque requirement were le tringent compared to the haft diameter. The OKF coupling (ee figure 2 at page 5) wa developed to create a imple connection between a cylindrical haft and engine or gearboxe having a flanged at the thrut haft. The OKF coupling i available with or without a hydraulic unit for mounting/ dimounting. Since the coupling i mounted on a cylindrical haft and not fixed by keyway, it can eaily be adjuted axially and rotated to the deired poition. The OK coupling higher torque capacity i obtained due to the entire contact urface tranmitting torque a oppoed to conventional coupling. Since there i no need for keyway, the dimenion of the haft and the coupling can be reduced. The OK coupling aure a implified mounting and dimounting procedure. Very large coupling, which previouly could only be hrunk on after heating, can now be aembled cold with the OK method. Typical intallation with OKC and OKF for a propeller haft line. nd thi i what happen The coupling i put into poition. High preure injector are connected to, and a low preure to the hydraulic chamber B. 2. Oil i injected into under high preure, building up an oil film between the inner and outer leeve, eliminating metallic contact and reducing friction force. 3. When there i a good oil film between the leeve, oil leak out at the thick end of the inner leeve. Oil i pumped into B and the outer leeve tart moving up the taper. Oil i continuouly injected between the leeve (), in order to avoid metallic contact. B B 4. The coupling ha reached it final poition when the outer diameter of the coupling ha grown by a predetermined value. The oil pump i topped, but preure in B mut remain. Preure in i releaed. B 5. When oil ha drained from the contact urface of the two leeve and friction ha been retored, low preure B i releaed. ll oil connection are plugged. The expoed part of the coupling are covered with a rut preventive and the coupling i ready for year of trouble-free operation. 4

5 Fig. 1 The OKC coupling. Fig. 2 The OKF coupling. 5

6 Shaft coupling OKC Coupling in ize OKC 180 OKC 190 are provided with two injection hole 1 3 BSP 1/4 BSP 3/4 D d a h7/e7 2 BSP 1/4 = G 1/4 BSP 3/4 = G 3/4 Deignation 1) d a D ) D 3) Ma M t max. 4) mm mm mm mm mm mm mm kg knm OKC OKC OKC OKC OKC OKC OKC OKC OKC OKC ) Coupling for haft of intermediate diameter are, for intance, deignated OKC ) May be lightly greater or maller when D i reached, depending on how the tolerance of coupling eating and coupling bore have been ued. See alo Mounting Intruction. 3) Increae of outer diameter, D, after mounting. 4) The afety factor referred to on page 15 mut be applied to obtain the permiible torque. Note: Required free length on one haft for intallation + 75 mm. 6

7 Shaft coupling OKC Coupling OKC 300 OKC 490 have threaded hole for lifting at both end. Thread OKC : M20 x : M24 x : M30 x BSP 1/4 1 BSP 3/4 3 G 2 D d a h7/e7 BSP 1/4 = G 1/4 BSP 3/4 = G 3/4 Deignation 1) d a D ) 4 D 3) G Ma M t max. 4) mm mm mm mm mm mm mm mm kg knm OKC M12-(4x) OKC M12-(4x) OKC M12-(4x) OKC M12-(4x) OKC M12-(4x) OKC M12-(4x) OKC M12-(4x) OKC M12-(4x) OKC M12-(4x) OKC M12-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x)

8 Shaft coupling OKC Deignation 1) d a D ) 4 D 3) G Ma M t max. 4) mm mm mm mm mm mm mm mm kg knm OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) OKC M16-(4x) ) Coupling for haft of intermediate diameter are, for intance, deignated OKC ) May be lightly greater or maller when D i reached, depending on how the tolerance of coupling eating and coupling bore have been ued. See alo Mounting Intruction. 3) Increae of outer diameter, D, after mounting. 4) The afety factor referred to on page 15 mut be applied to obtain the permiible torque. Note: Required free length on one haft for intallation + 75 mm. Shaft coupling OKC BSP 1/4 BSP 1/2 1 BSP 3/4 G 3 Coupling OKC 500 OKC 1000 have threaded hole for lifting at both end Thread OKC : M30 x : M36 x : M42 x : M48 x : M64 x 6 2 D d a h7/e7 BSP 1/4 = G 1/4 BSP 3/4 = G 3/4 BSP 1/2 = G 1/2 Deignation 1) d a D ) 4 D 3) G Ma M t max. 4) mm mm mm mm mm mm mm mm kg knm OKC M20-(4x) OKC M20-(4x) OKC M20-(4x)

9 Shaft coupling OKC Deignation 1) d a D ) 4 D 3) G Ma M t max. 4) mm mm mm mm mm mm mm mm kg knm OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) OKC M20-(4x) ) Coupling for haft of intermediate diameter are, for intance, deignated OKC ) May be lightly greater or maller when D i reached, depending on how the tolerance of coupling eating and coupling bore have been ued. See alo Mounting Intruction. 3) Increae of outer diameter, D, after mounting. 4) The afety factor referred to on page 15 mut be applied to obtain the permiible torque. Note: Required free length on one haft for intallation mm. 9

10 Flange coupling OKF Drive-up length C B BSP 3/4 BSP 1/4 BSP 3/4 R D 1 D L d a h7/f7 BSP 1/4 = G 1/4 BSP 3/4 = G 3/4 The pitch circle i evaluated from: E = D 1 (1.6 x bolt diameter) L 1 Lock level from ize OKF 300 Deig- d a D D 1 1 B R L L 1 C Ma M 1) t max. Suitable nation Supergrip mm mm mm mm mm mm mm mm mm mm kg knm Bolt ize OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF ) The afety factor referred to on page 15 mut be applied to obtain permiible torque. r f c OKBS 40 10

11 Flange coupling OKF Deig- d a D D 1 1 B R L L 1 C Ma M 1) t max. Suitable nation Supergrip mm mm mm mm mm mm mm mm mm mm kg knm Bolt ize OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF OKF r f c r f c OKBS 50 OKBS 60 OKF OKF OKF OKF OKBS 70 OKF OKF OKF OKF OKF OKF OKF OKF f OKBS 80 OKF OKF OKF OKF OKF OKF OKF f OKBS 90 OKF OKF OKF OKF OKF r OKF OKF OKBS 100 OKF OKF ) The afety factor referred to on page 15 mut be applied to obtain the permiible torque. r f c r c r c f c 11

12 Shaft coupling OKCS BSP 1/4 BSP 3/4 2 D d a h6/f7 F BSP 1/4 = G 1/4 BSP 3/4 = G 3/4 Deignation 1) d a D 1 2 F Ma M t max. 2) mm mm mm mm mm mm kg knm OKCS OKCS OKCS OKCS OKCS OKCS OKCS OKCS OKCS OKCS ) Coupling for haft of intermediate diameter are, for intance, deignated OKCS ) The afety factor referred to on page 15 mut be applied to obtain the permiible torque Note: Required free length on one haft for intallation + 75 mm. 12

13 Hydraulic ring and propeller nut OKTC BSP 1/4 L Propeller nut Propeller Propeller nut Propeller Propeller nut Propeller d Ø D 1 S d 1 d 2 Ø D 2 Nut with integrated thread i deignated OKTH. Deignation d D 1 d 1 d 2 D 2 L S max. Max. force Ma mm mm mm mm mm mm mm knm (at 70 MPa) kg OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC OKTC Thi lit i deigned a a guide. If the ring you require i not lited, pleae contact your cloet ditributor, and we will deign a ring for you on the receipt of the following information: a. Dimenion of propeller bo. b. Maximum power, kw. c. Speed, r/min. d. Safety factor. e. Modulu of elaticity for bo and haft repectively, N/mm 2. f. Temperature coefficient of linear expanion for bo and haft repectively. g. Yield point for haft and bo, N/mm 2. If drive-up force and drive-up length i being calculated by cutomer that information together with the propeller haft thread and the mall inner diameter of the propeller bo only are required. SKF pump i recommended for the ring a well a for injecting oil in the propeller hub. For ize OKTC 505 or larger, an air driven pump, THP 150 i recommended. 13

14 Tailor-made OK coupling Beide tandard erie of OK coupling, SKF Coupling Sytem deign and manufacture tailor-made OK coupling for haft diameter from 100 mm and up. Some example: Flange coupling and Supergrip bolt combination for limited pace Double leeve arrangement for bearing intallation Hub for gear coupling Hydraulic hrink dic coupling Double flange coupling 14

15 Power tranmiion capacity Torque tranmitted by the OKC coupling i directly proportional to the urface preure between the inner leeve of the coupling and the haft after the outer leeve ha been driven up axially. The neceary driveup, which i reached when the diameter of the outer leeve ha increaed by dimenion D for OKC and OKCS coupling, and the tated drive-up length for OKF coupling given in the table, will enure a preure of 120 N/mm 2 for OKC coupling, and 100 N/mm 2 for OKF coupling. The table lit the maximum torque which can be tranmitted calculated uing the equation: p. d 2. a B. p. µ M tmax. = where: M tmax. maximum tranmiible torque, Nm d a haft diameter, mm B effective preure length (equal to d a ) in mm p minimum urface preure between haft and inner leeve in N/mm N/mm 2 for OKC and OKCS 100 N/mm 2 for OKF µ coefficient of friction (0.14) If the coupling i ubjected to axial force, their effect on the power tranmiion capacity i generally inignificant. The tranmiible torque i obtained from the equation: M t =P M tmax. where: M tmax. F a d a 2 t F a x d 2 y a a v 2 x 10 3 b maximum tranmiible torque, Nm axial force, N haft diameter, mm The permiible torque i obtained from: M = where M M tmax. M t f M tmax. or M t f permiible torque, Nm maximum tranmiible torque, Nm tranmiible torque, Nm afety factor, which can be elected from the table below Safety factor f at different load Type of power ource Type of load on the driven machine Uniform load Moderate hock-load Heavy hock-load Centrifugal pump Piton compreor Excenter pree Fan Small piton pump Draw benche Light conveyor Cutting tool machine Plane machine Turbo compreor Packeting machine Large piton compreor gitator Wood working machine Electric motor, turbine Multiple cylinder piton engine Single cylinder piton engine When the coupling i intended for marine application, the afety factor ha to be elected according to the rule of the referred claification ociety. 15

16 Shaft To facilitate haft alignment for OKC and OKCS coupling one of the haft hould be o deigned that the coupling can be lid along it far enough to expoe the outermot part of the coupling eating. Surface roughne i to be within R a 2.5 µm. ISO tolerance h8 applie to coupling eating from mm. ISO tolerance h7 i ued for larger diameter. IT 5 Ø d a IT 7 2 Shaft Tolerance Circularity Parallelim diameter d a h7 IT7 IT5 deviation 2 over to upper lower mm mm µm µm µm µm Converion table Converion: millimetre to inch Shaft diameter Tolerance h7 d a deviation Millimetre Inch Millimetre Inch over to over to upper lower upper lower Length Ma Force Torque Power Preure 1 mm = in 1 in = 25.4 mm 1 kg = lb 1 lb = kg 1 N = lbf 1 lbf = 4.45 N 1 Nmm = in.lbf 1 Nm = 8.85 in.lbf 1 lbf.in = 113 Nmm = Nm 1 lbf.ft = Nmm = Nm 1 W = HP 1 HP = 736 W 1 MPa = 1 N/mm 2 = 145 pi 1 pi = N/mm 2 = MPa Kinematic 1 mm 2 / = 1 cst vicoity Temperature 0 C = 32 F F = 1.8 x C

17 Hollow haft for OKC coupling The outer leeve mut be driven further up with hollow haft than with olid one if the ame preure and power tranmiion capacity are to be achieved. The haft mut alo be reinforced by mean of leeve hrunk into rece turned beneath the coupling eating. Thi will prevent the tree, which arie in the haft material when the coupling ha been mounted, from exceeding the permiible value. The reinforcement leeve hould be made of toughened teel with a yield point of at leat 850 N/mm 2. The length of the leeve hould be 15 mm longer than the preure length (= mm). The outide diameter, the required interference between the leeve and the haft, and the increae in the drive-up ditance (the reduction in dimenion 3 ) can be obtained from the table below for variou value of diameter ratio d c /d a. Suitable tolerance range for the outide diameter of the leeve and the recee in the haft are IT6 and IT7 repectively. Note that the coupling eating hould be machined to the precribed diameter tolerance only after the reinforcement leeve have been fitted. Example: n OKC coupling i to be mounted on haft with an outide diameter of 400 mm and a bore of 120 mm. d c 120 i.e. = = 0.3 d a 400 The outide diameter of the reinforcement leeve i d obtained from b = 0.49, i.e. db = 196 mm. d a The interference d i obtained from d = , i.e. d = 0.25 mm d b The increae in drive-up ditance, R, i obtained R from the ratio = Thu dimenion 3 in d a the table on page 7 (30 mm) mut be reduced by 3.6 mm. 3 R d c d b d R d a d a d b d a d c d b d a With hollow haft whoe diameter ratio exceed 0.55 the normal preure and tranmitted torque cannot be fully achieved. In uch cae, pleae conult u or your local repreentative. Hollow haft for OKCS and OKF coupling For OKCS and OKF coupling mounted on hollow haft, pleae contact your local repreentative. 17

18 Modular equipment for mounting and dimounting TMHK 36 Suitable for OKC OKC 170 and OKCS OKCS Tool cae /3 1 Oil injector Hand operated pump TMJL 50 1 Set of hex key 1 Spare part for injector Ma: 19 kg TMHK 37 Suitable for OKC OKC 250 and OKF OKF Tool cae /3 2 Oil injector Hand operated pump TMJL 50 1 Pipe dapter block Set of hex key 1 Spare part for injector Ma: 28.1 kg Set TMHK 38 can alo be ued for thee coupling ize. The et contain a hydraulic pump driven by compreed air which enable the coupling to be mounted more quickly. TMHK 38 Suitable for OKC OKC 490 and OKF OKF ir-driven pump et THP 030/SET 1 Return hoe Oil injector Set of hex key 1 Spare part for injector Ma: 32.1 kg 18

19 TMHK 38S Suitable for OKC OKC 490 and OKF OKF ir-driven pump et THP 030/SET 1 Return hoe ir-driven pump THP 300E 1 Oil injector Set of hex key 1 Spare part for injector Ma: 76.2 kg including weight of pallet TMHK 39 Suitable for OKC 500 and larger 1 ir-driven pump et THP 030/SET 1 Return hoe Oil injector Set of hex key 1 Spare part for injector Ma: 35.1 kg Thi et i intended for ue on board hip where dimounting and mounting i only carried out infrequently. For hipyard and workhop et TMHK 40 or TMHK 41 with an air-driven high preure pump are recommended. TMHK 40 Suitable for OKC 500 and larger 1 ir-driven pump et THP 030/SET 1 Return hoe ir-driven pump THP 300E 2 Oil injector Set of hex key 1 Spare part for injector Ma: 78.2 kg including weight of pallet Thi et or alo et TMHK 41 are recommended for hipyard and workhop. The air-driven high preure pump implifie work coniderably. TMHK 41 Suitable for OKC 500 and larger 1 ir-driven pump et THP 030/SET 1 Return hoe ir-driven pump THP 300E 1 Set of hex key Ma: kg including weight of pallet Thi pump et i recommended for hipyard and workhop. 19

20 Oil The mineral motor oil to be ued for the hydraulic pump and the injector hould have a vicoity of 300 mm 2 / (300 cst) at the temperature of the coupling. Thi vicoity will generally be obtained with ufficient accuracy if the oil i choen according to the table below. Temperature range Vicoity 0 8 C mineral motor oil SE 10 W 8 18 C mineral motor oil SE 20 W C mineral motor oil SE 30 W C mineral motor oil SE 40 W C mineral motor oil SE 50 W pproved by leading claification ocietie Connecting rigid haft with OK coupling i a timeaving olution that ha been uen on land and at ea for more than fifty year. The coupling are well known all over the world for their high quality, creative deign and operational afety. In the production line each tep i carefully controlled and the finihed coupling are ubjected to a rigid final inpection regarding ize and teel quality before delivery. The coupling are alo approved by all major claification ocietie, for example Det Norke Verita. 20

21 Locating device for outer leeve ll OKC coupling for haft with diameter over 200 mm and OKF coupling for haft with diameter over 300 mm are equipped with lock lever, which prevent the outer leeve from being driven up unintentionally on the inner leeve during tranport and when the coupling i being mounted or dimounted. The lock lever alo lock the nut when the coupling ha been intalled. Locating device before mounting Locating device after mounting Mounting arrangement for OKC coupling To facilitate the mounting and dimounting of large OKC coupling, it i adviable to ue ome type of lifting arrangement. The type of arrangement hown will alo allow radial haft alignment. In both cae the carriage hould move in line with the haft. OPTION I wheeled carriage i provided with two hydraulic jack, poitioned a hown. Thi allow the coupling to be adjuted a required. OPTION II n overhead carriage with two fixed chain block i poitioned above the coupling. Lifting rope are poitioned a hown giving the required adjutment. 21

22 The Supergrip bolt cut down on downtime t a time when maintenance cot efficiency in heavy indutrie i a make-or-break factor in operational economy, the time-aving Supergrip concept can cut cot dramatically. When you connect your coupling with Supergrip bolt, there i no uncertainty about the length of downtime for removing the bolt. No worry about whether the bolt have jammed or eized in the hole. You know that once the tenion and expanion preure have been releaed, each bolt will lide out a eaily a it went in. Ninety percent reduction of downtime tudy releaed by the Swedih State Power Board on the comparion of individually fitted bolt with Supergrip bolt howed a 90 % reduction in the time required to diaemble and reaemble the coupling of two turbo et (eight coupling). The unit equipped with Supergrip bolt wa reconnected to the power grid 48 hour earlier than the unit with conventional bolt. Total aving were 19,200,000 kwh (48 hour x 400 MW). Oil injection method The Supergrip bolt are a uperior olution for connecting rotating flange coupling. Compared with traditional bolt ytem, Supergrip bolt are eaier to intall and remove, take much le time and hold the coupling halve together much more ecurely. The torque in a coupling connected with Supergrip bolt i tranmitted in two way: by hear trength of the expanded bolt in the hole, and by the friction effect at the flange face created by pre-loading the bolt. Deigned pecifically for uch high-torque application a propeller haft, rudder aemblie, turbo generator, the Supergrip bolt offer ignificant advantage. Simplified machining of the hole and no grinding of the bolt. You eliminate re-reaming and re-honing. The bolt are deigned to be inerted and removed with an initial clearance fit. There i no rik of eizure. For more detailed information and deign recommendation, pleae ak for our Supergrip brochure. 22

23 The oil injection method ued in our OK coupling wa developed by u in the early Since then more than 36,000 coupling have been upplied to hip, power intallation, etc all over the world. The OK coupling are manufactured in modern NC-controlled equipment utilizing CD/CM technology. Our mot important reource i, however, a well-trained taff with a long experience and tradition of manufacturing preciion engineering product.

24 SKF Coupling Sytem B wa etablihed in the early 1940 when SKF Chief Deigner, Erland Bratt, invented the SKF oil injection method. the reult of continuou development, SKF i currently a world leader in elected market niche. Our buine concept i to develop, produce and upply product baed on the SKF oil injection method. Thee product ignificantly reduce downtime and lower maintenance cot of the capital-intenive equipment in which they are ued. SE Hofor, Sweden. Tel: Fax: kf.coupling.ytem@kf.com Webite: