High Torque Low Speed Hydraulic Motors

Transcription

1 High Torque Low Speed Hydraulic Motors

2 INDEX Page 3 Index Page 4 Introduction Page 5 Motor types Page 6 Motor type HMB Dimensions, technical data and ordering code Page 9 Motor type HMJ and HMH Dimensions, technical data and ordering code Page 12 Motor type HMK Dimensions, technical data and ordering code Page 14 Two-speed motors Page 17 Two shaft end motors Load control valves Page 18 Interchangeable front-mounting options Page 19 Effect of pulsation Page 20 Service life Page 21 External load Radial load on front bearing Bending- and torque stresses Axial load Page 22 Internal pressure losses Page 23 Oil leakage Page 24 Hydraulic motors for winches without mechanical brakes Load control valves Back-pressure Page 25 Drain pressure Oil circulation Hydraulic fluids Page 26 Shaft seals Corrosion protection This catalogue is issued spring As time passes, a development and improvement in design will normally take place. Specification of items may therefore be liable to change without notice. 3

3 Producer of high pressure hydraulics With 50 years of experience in hydraulic design and manufacturing, Brødr. Bauer-Nilsen AS produces an extensive range of high-pressure hydraulic equipment for the shipbuilding sector as well as for offshore and land-based industry. Bauer-Nilsen products include high-torque, slow-speed hydraulic motors, high-pressure hydraulic cylinders and hydraulic control valves. HIGH-TORQUE LOW-SPEED HYDRAULIC MOTORS The Bauer Hydraulics production programme concists of different standard motors size ranging from 1.8 l/rev to 32.6 l/rev with turning moments up to Nm. All motors are radial piston type with heavy roller bearings on shaft end eccentric. Internal friction is very low and starting torque high. Bauer Hydraulics also produces motors with two shaft ends. Two-speed motors are also available. The two-speed/torque arrangement is obtained either by moving the slide spindle axially (HR 12) or by a circulation valve (HR 14) for speed control of the motor. The circulation valve (HR 14) offers a very smooth changing of speed/torque even when the motor is loaded/running. By introducing larger pistons diameters in existing motor designs, applicable for motors subjected to moderate fatigue loads, Bauer Hydraulics now has available motors with a better price on volume ratio. In order to have a higher drainage pressure on large motors, these motors are now made with a strengthened motor casing. These motors are now better suited to be installed on large vessels by connecting the drain lines directly to the hydraulic system s common return line. HIGH PRESSURE HYDRAULIC CYLINDERS Double-acting and single-acting cylinders with strokes up to mm; diameter mm and larger telescopic cylinders are delivered to the rules of the different classification societies. A great number of different cylinder designs are available, trunnion or flange mountings and internal mechanical locking. HYDRAULIC CONTROL VALVES Bauer s design of hydraulic manoeuvring valves combines the effect of a balanced spindle and seated valves, eliminating leakages through pres - sure ports and maintaining smooth, easy operation. This solution is of special value in constant pressure systems, and the delivery programme includes: control valves for series and constant pressure systems load control valves for cylinders and hydraulic motors with adjustable damping manoeuvring stations with baseplate valve mounting, sub-plates in accordance with ISO standard HYDRAULIC WINCHES AND JIGGER WINCHES For doors, containerlifts, ramps and RO-RO ramps we deliver jigger winches and hydraulic winches with a large range of different sizes and capacities to meet customer requierements. 4 Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

4 BAUER MOTOR TYPE HMB The different motor sizes are built up on a limited number of standard parts. Large roller bearings on the eccenter. TECHNICAL DESCRIPTION The Bauer motors are high torque low speed radial piston motors with 5 to 18 cylinders. The motor shaft is equipped with two roller bearings, and the eccenter has a large roller bearing. Mechanical losses in the transmission are small, and the motor has a high starting torque. The oil supply to the cylinders is directed by a hydrauli cally balanced slide system. The slide therefore runs with very low friction forces even at the highest hydraulic pressure. Cylindrical roller bearings are standard Dual load control valve directly mounted on slide valve also available. BAUER MOTOR TYPE HMJ, HMH AND HMK Bauer motor type HMK has, except for two cylinder banks, in principle the same design as HMJ and HMH. Cylindrical roller bearings are standard. 5 to 18 cylinders in the motor casing. Piston pins connec - tion rods and slide valves are hydro - statically balanced. Two speed slide valves also available. Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 5

5 MOTOR TYPE HMB DIMENSIONS AND TECHNICAL DATA MOTOR TYPE HMB5 1.8/2.3/2.8 HMB5 1.8/2.3/ T with 300 l/min slide valve. HMB5 1.8/2.3/ T with 500 l/min slide valve. 17 MOTOR TYPE HMB5 2.6/3.3/4.0 HMB5 2.6/3.3/ T with 300 l/min slide valve. HMB5 2.6/3.3/4.0-1-T with 500 l/min slide valve. MOTOR TYPE HMB7 3.7/4.6/5.6 HMB7 3.7/4.6/5.6 -T with 300 l/min slide valve. HMB7 3.7/4.6/5.6 -T with 500 l/min slide valve. 20 OIL CONNECTION Connections a and b on 300 l/min slide valve 1ʼʼ BSP. Connections a and b on 500 l/min slide valve 1 1/2ʼʼ BSP. On 7 cylinder motors connection through adapters with length 95 mm. DRAIN Connection c: 3/4ʼʼ BSP. Drain always to be connected to the highest connection point. ROTATION Clockwise rotation view from shaft end: b-oil inlet and a-oil outlet. TIGHTENING OF MOUNTING SCREWS Tightening torque on screw M16 (quality 8.8): 180 Nm Tightening torque on screw M20 (quality 8.8): 360 Nm 6 Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

6 ALTERNATIVE SHAFT TYPES: Parallel shaft: Splines BS 3550: Splines DIN 5480 Key: 7/8 x7/8 x135 BS46 6/12 pitch, flat root side fit WA90x3x30x28xh6x9e HMB5-1.8/2.3/2.8 Parallel shaft Splines BS 3550:1963 Splines DIN 5480 Key: 1 x1 x135 (BS46) 6/12 pitch, flat root side fit WA100x3x30x32xh6x9e HMB5-2.6/3.3/4.0 HMB7-3.7/4.6/ DIFFERENT MOTOR VERSIONS AND APPLICATIONS The motor type HMB is produced in 3 different versions: 1. A heavy duty industrial motor with large cylindrical bearings and a 500 l/min slide valve. The cylindrical roller bearings give longest service life of the different type of bearings that can be mounted in a standard motor. For carrying external radial loads they have the highest fatigue capacity. 2. Also a heavy duty motor with large cylindrical bearings, but with a 300 l/min slide valve for lower speed. 3. For motors on applications where the shaft has to carry large axial loads, taper roller bearings are recommended. Cylindrical roller bearings are standard. The HMB motors can also be equipped with two shaft connections (shaft on both sides). TECHNICAL DATA - HMB METRIC Displacement Speed with oil delivery 600 l/min 1) Max working pressure, short duration 2) Working pressure, intermittent duty 3) Working pressure, con - tinuous duty 4) Minimum specific starting torque 5) Specific running torque litre Nm Nm rev rpm bar bar bar bar bar Weight (dry) w/300 l/min. slide valve kg Weight (dry) w/500 l/min. slide valve kg US in 3 lbf ft lbf ft rpm psi psi psi rev psi psi lb lb HMB5-1.8 HMB5-2.3 HMB5-2.6 HMB5-2.8 HMB5-3.3 HMB5-4.0 HMB7-3.7 HMB7-4.6 HMB , ,6 27, ,25 1, , ,7 34, ,56 1, , ,3 39, ,80 2, , ,4 41, ,90 2, , ,2 49, ,25 2, , ,0 60, ,75 3, , ,7 55, ,58 2, , ,3 69, ,22 3, , ,5 84, ,94 4, ) For working periods of short duration and intermittent duty e.g. maneouvering of ship s hatches and capstans. Test pressure is 375 bar. Peak (shock) pressure up to 375 bar is allowed. 2) Recommended oil pressure for excavators, winches and normal transport equipment, and various applications for intermittent duty. 3) Service life for the motors can be calculated with the lifetime formula page 20. 4) See diagrams and information page 19. 5) 95% efficient. Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 7

7 TORQUE PRESSURE DIAGRAM lbf. ft Nm HMB lbf. ft lbf. ft Nm Nm 5000 Nm HMB7-4.6 HMB5-4.0 HMB7-3.7 HMB5-3.3 HMB5-2.8 HMB5-2.6 HMB5-2.3 HMB bar psi ORDERING CODE FOR MOTOR TYPE HMB Example: HMB T Y - N - No. of cylinders: Displacement (l/rev): No off shaft ends: 1 shaft end 1 2 shaft ends 2 Shaft type: Taper T Parallel P Spline S Mounting type: Standard (no code) Front mounting flange F Slide valve (one speed): 300 l/min l/min 5 Shaft bearings: Cylindrical roller Y Taper roller A Shaft seals: Single acting, nutring N High speed seal M Special arrangements X Other details: (special hydr. fluids valves, etc.) Reference to old and new designation. Old designation HMB HMB HMB HMB HMB HMB New designation HMB5-1.8 HMB5-2.3 HMB5-2.6 HMB5-3.3 HMB7-3.7 HMB Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

8 MOTOR TYPE HMJ AND HMH DIMENSIONS AND TECNICAL DATA MOTOR TYPE HMJ9-4.7/5.9/7.2 Front mounting MOTOR TYPE HMH5-7.3 HMH7-10.2/12.7 HMH9-13.2/16.3 Front mounting OIL CONNECTION Connections a and b on slide valve: 1 1/2ʼʼ BSP. On 7 and 9 cylinder motors connection through adapters with length 95 mm. ROTATION Clockwise rotation view from shaft end: b-oil inlet and a-oil outlet. DRAIN Connection c: 3/4ʼʼ BSP. PCD 618 on HMJ motor PCD 845 on HMH motor Drain always to be connected to the highest connection point. For special adapters on motors working with shaft upwards, consult us. TIGHTENING OF MOUNTING SCREWS Tightening torque on screw M16 (quality 8.8): 180 Nm Tightening torque on screw M20 (quality 8.8): 360 Nm Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 9

9 ALTERNATIVE SHAFT TYPES: Parallel shaft: Splines BS 3550: Splines DIN 5480 Key: 1 x1 x135 BS46 6/12 pitch, flat root side fit WA100x3x30x32xh6x9c HMJ9-4.7/5.9/7.2 Parallel shaft Splines DIN 5480 Key: 1 1/4 x1 1/4 x160 BS46 WA120x3x30x38xh6hx9e HMH5-7.3 HMH7-10.2/12.7 HMH9-13.2/16.3 DIFFERENT MOTOR VERSIONS AND APPLICATIONS The HMJ and HMH motors are designed for cylindrical bearings. The 500 l/min slide valve is standard on HMJ and HMH. The 9 cylinder motors can also be equipped with two-speed slide valves. HMJ and HMH can also be delivered with two shaft connections (shaft on both sides). See page 17. TECHNICAL DATA HJM AND HMH METRIC Displacement Speed with oil delivery 600 l/min 1) Max working pressure, short duration 2) Working pressure, intermittent duty 3) Working pressure, con - tinuous duty 4) Minimum specific starting torque Nm 5) Specific running torque Nm litre rev rpm bar bar bar bar bar Weight (dry) w/500 l/min. slide valve kg 6) Weight (dry) w/two-speed slide valve. HR12 kg US in 3 lbf ft lbf ft rpm psi psi psi rev psi psi lb lb HMJ9-4.7 HMJ9-5.9 HMJ9-7.2 HMH5-7.3 HMH HMH HMH HMH , ,5 71, ,43 3, , ,3 89, ,29 4, , ,0 109, ,23 5, , ,9 110,4 885 N/A ,02 5, N/A 10, ,2 154,2 945 N/A ,18 7, N/A 12, ,7 191,8 953 N/A ,93 9, N/A 13, ,1 199, ,62 10, , ,5 246, ,87 12, ) For working periods of short duration and intermittent duty e.g. manouvering of ship s hatches and capstans. Test pressure is 375 bar. Peak (shock) pressure up to 375 bar is allowed. 2) Recommended oil pressure for excavators, winches and normal transport equipment, and various applications for intermittet duty. 3) Service life for the motors can be calculated with the lifetime formula page 20. 4) See diagrams and information page 19. 5) 95% efficient. 6) Add 40 kg (88 lb) for two-speed slide valve HR Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

10 TORQUE PRESSURE DIAGRAM lbf. ft Nm Nm lbf. ft Nm lbf. ft Nm Nm lbf. ft Nm lbf. ft Nm HMH HMH HMH HMH HMJ9-7.2 & HMH5-7.3 HMJ9-5.9 HMJ bar psi ORDERING CODE FOR MOTOR TYPE HMJ AND HMH Example: HMJ T N - Motor type: HMJ HMH No. of cylinders: 5-9 Displacement (l/rev): (HMJ) (HMH) No off shaft ends: 1 shaft end 1 2 shaft ends 2 Shaft type: Taper T Parallel P Spline S Mounting type: Standard (no code) Front mounting flange F Slidevalve one speed: 500 l/min 5 Slide valve two-speed: speed ratios: 9/6, 9/3, 9/0, 6/3 Please contact us for other speed ratios. Slide valve, two-speed: HR11, hydraulic (9/0 only) E HR12, manual B HR12, hydraulic H HR14, hydraulic C Shaft seals: Single acting, nutring N High speed seal M Special arrangements X Other details: (special hydr. fluids valves, etc.) Reference to old and new designation. Old designation HMJ HMJ HMJ HMH HMH HMH HMH New designation HMJ9-4.7 HMJ8-5.2 HMJ9-5.9 HMH5-7.3 HMH HMH HMH Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 11

11 MOTOR TYPE HMK DIMENSIONS AND TECHNICAL DATA MOTOR TYPE HMK HMK /32.6 OIL CONNECTION Connections a and b on slide valve: 1 1/2ʼʼ BSP. Connection through adapters with length 95 mm. DRAIN Connection c: 3/4ʼʼ BSP on PCD 845. Drain always to be connected to the highest connection point. For special adapters on motors working with shaft pointing upwards, please consult us. ROTATION Clockwise rotation view from shaft end: Oil inlet: connection b Oil outlet: connection a TIGHTENING OF MOUNTING SCREWS Tightening torque on screw M20 (quality 8.8): 360 Nm ALTERNATIVE SHAFT TYPES: Splines: WA150x3x30x48xh6x9e DIN 5480 Parallel shaft on request. MOTOR TYPE: HMK HMK /32.6 METRIC Displacement Speed with oil delivery 1000 l/min 1) Max working pressure, short duration 2) Working pressure, intermittent duty 3) Working pressure, con - tinuous duty Minimum specific starting torque 4) Specific running torque litre Nm Nm rev rpm bar bar bar bar bar Weight (dry) w/1000 l/min slide valve kg Weight (dry) w/two-speed slide valve HR22 kg US in 3 lbf ft lbf ft rpm psi psi psi rev psi psi lb lb HMK HMK HMK , ,4 308, ,36 15, , ,2 398, ,24 20, , ,0 493, ,74 25, ) For working periods of short duration e.g. manouvering of ship s hatches and capstans. Test pressure is 375 bar. Peak (shock) pressure up to 375 bar is allowed. 2) Recommended oil pressure for excavators, winches and normal transport equipment, and various applications for intermittent duty. 3) Service life for the motors can be calculated with the lifetime formula page 20. 4) 95% efficient. 12 Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

12 TORQUE PRESSURE DIAGRAM lbf. ft Nm lbf. ft lbf. ft Nm Nm Nm HMK HMK lbf. ft Nm HMK lbf. ft Nm Nm bar psi ORDERING CODE HMK Example: HMK T N - No. of cylinders: Displacement (l/rev): Shaft type: Taper T Parallel P Spline S Slide valve HR20 (one speed): 1000 l/min 10 Slide valve HR22 (two-speed): Speed ratios 18/9, 18/0, 14/7, 14/0 Please contact us for other speed ratios. Shaft seals: Single acting, nutring N High speed seal M Special arrangements X Other details: (special hydr. fluids valves, etc.) Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 13

13 TWO SPEED MOTORS On some applications there is a matter of necessity to have two optional running speeds on the hydraulic motor. Bauer Hydraulics motor types HMJ, HMH and HMK can be delivered as two-speed motors. Bauer Hydraulics use two different principles to obtain the two speed/torque function. One by moving the slide valve spindle (HR12) and the other by disconnecting cylinders through a circulation valve (HR14 and HR22). All cylinders are engaged when running at slow speed/ high torque, and some cylinders are disconnected when running with high speed/low torque. Standard speed/torque ratios obtain able are as follows: 6/3, 9/3, 9/6,14/7 and 18/9. When other speed/torque ratios are required, please contact us. The ratio 8/4 is infrequently used. Running a motor on 4 cylinders gives a very uneven torque and angular speed (see diagram page 19.) This might cause uncontrolled vibrations. The circula tion valve can also be used for free-wheeling. In this case, cylinders are disconnected, e.g. 7/0, 9/0, 14/0, 18/0 HYDRAULIC OPERATION The two-speed slide valves HR14 and HR22 are hydraulically operated. High speed is optained by applying a pilot pressure. Two alternative pilot pressure settings are available: 20 bar and 60 bar. A 60 bar pilot pressure is however standard. Slow speed is automatically obtained by zero pilot pressure. MANUAL OPERATION The slide valve HR12 can also be delivered as manually operated. The manually operated lever has two positions. One position gives high speed/low torque, and other position gives low speed/high torque. The force needed to change position is low, approximately 5 kg. HMJ and HMH motor with two-speed slide valve HR12 Hydraulically operated Manually operated Angular position of ports Port dimensions a and b, 1 1 /2 BSP d = 3 /8 BSP Motor type HMJ HMH dim. A B C D E F G mm in 32,5 10,24 9,21 8,94 12,68 29,80 4,41 mm in 37,2 10,24 9,21 8,94 12,68 34,53 4,41 Displacement/speed ratio RATIO 9/6 9/3 4.7/ / / / / / / / / / Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

14 HMJ and HMH motor with two-speed slide valve HR14 By using the slide valve HR14 we obtain a very smooth changing of speed/torque, even when the motor is loaded and running. By this arrangement the cross-connected cylinders are emptied and drained to tank, hence we avoid overheating the oil. Motor type HMJ HMH dim. A B mm in 32,09 22,44 mm in 36,81 25,00 Displacement/ speed ratio RATIO 9/6 9/3 4.7/ / / / / / / / / /5.4 HMK motor with two-speed slide valve HR22 Bauer motor type, HMK, has two banks of cylinders. This design offers several speed/torque ratios e.g. 18/9, 18/0, 14/7, 14/0. The HMK motor can also be furnished with cylinders with different diameter. For further dimensions, see technical data for motors on page 12. Some dimensions might be changed without futher notice. Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 15

15 FLOW/LEAKAGE DATA FOR TWO-SPEED MOTORS The below diagrams show the total pressure drop in the motor measured between the outlet- and inlet ports. The HR12 slide valve has two outlet- and inlet ports. When all ports are used, the pressure losses are reduced approx. 25%. The above curves show the total pressure drop for HMJ9-5.9 with slide valve HR12. The above curves show the total pressure drop for HMJ9-5.9 with slide valve HR14. The above curve shows the total pressure drop for HMK with slide valve HR Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax ,

16 TWO SHAFT ENDS HMH and HMJ motors All dimensions, shaft and flange options as given on previous pages. HMB motors a b 3/4 On the HMH and HMJ motors the slide valve is driven by a pair of conical gearwheels. The valve is of standard design. Two speed valves are also available. The HMB motors with two shaft ends, have a slide valve arrangement con sisting of a cam-driven spool valve for each cylinder. Motor type A B C D E F G H HMB5-1.8/2.3/ HMB5-2.6/3.3/ HMB7-3.7/4.6/ LOAD CONTROL VALVES The 300 l/min slide valve can be equipped with the following dual load control valves: 1. The type HV 270 for flows less or equal to 40 l/min. 2. The type HV 272 for flows less or equal to 80 l/min. 3. The type HV 203 for flows less or equal to 80 l/min. This valve is furnished with an adjustable damping. Please contact us for technical data and dimensional drawing of the control valves, or when larger flow rates are required. Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 17

17 INTERCHANGEABLE FRONT-MOUNTING OPTIONS HMB5-1.8/2.3/2.8 HMB5-2.6/3.3/4.0 HMB5-1.8/2.3/2.8 HMB5-2.6/3.3/4.0 5 holes ø21 equiangular on PCD 419,1 (16,5ʼʼ) HMB7-3.7/6.6/5.6 HMB 7-3.7/4.6/5.6 7 holes ø21 equiangular on PCD 520,7 (20,5ʼʼ) as shown. Tolerance A, h8 Tolerance B, e9 Motor type HMB5-1.8/2.3/2.8 HMB5-2.6/3.3/4.0 HMB7-3.7/4.6/5.6 dim. A B C D E F mm , in 8, ,5 18,23 4,25 1,3 mm , in 9, ,5 18,74 4,75 1,38 mm ,2 520, ,5 33 in 9, ,5 22,2 4,31 1,3 18 Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

18 EFFECT OF PULSATION ON STARTING AND RUNNING TORQUE The most distinct characteristics given by the above curves are that odd-number cylinders in general have a much smoother pulsa tion then even-number cylinder. A pulsation of 29,9% as illustrated in curve for four cylinders is regarded to give too high vibrations. Consequently, four cylinders are not recommended. The curves are based on the Bauer HMH motor with cylinder diameter ø145 mm and stroke 110 mm. 3 cyl. 4 cyl. 5 cyl. pulsation 23,4% pulsation 29,9% pulsation 7,4% cyl. 7 cyl. 8 cyl. pulsation 13,6% pulsation 4,2% pulsation 7,7% cyl. 9 cyl. used as 6 cyl. (ref. two speed motors) pulsation 2,2% pulsation 11,5% Starting torque is dependent on the cylinders starting position. Low starting torque will occur when the cylinders are positioned at an angle corresponding to the low- and sharp bottoms of the pulsation curves. Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 19

19 SERVICE LIFE OF THE MOTOR Experience shows that the limiting factor in the lifetime of a hydraulic motor is the bearing life of the roller bearings on the shaft. The estima ted bearing life is calculated according to the standard formula issued by the bearing producers. Lifetime formula L= bearing life in million revolutions [10 6 rev.] C= dynamic load rating given by the bearing producers [N] P1= load cause by the working pressure in the motor [N] P2= load cause by external load (K) on the shaft end [N]. See calculation next page. F= specific load [N/bar] p= working pressure [bar] P1 = F. p [N] P = P1+ P2 [N] L = ( C ) 10 P 3 [10 6 rev.] K = external radial load [N] a = distance from external load to centre of front bearing [mm] b = distance from end of shaft to centre of bearing [mm] e = distance between shaft bearings in motor [mm] d = shaft diameter [mm] F C Shaft dia. Bending Shear b e [N/bar] [N] d [mm] Wb [mm 3 ] Wp [mm 3 ] [mm] [mm] HMB ,1 340x HMB ,4 340x HMB ,1 415x HMB ,5 340x HMB ,4 415x HMB ,5 415x HMB ,5 415x HMB ,3 415x HMB ,5 415x HMJ ,0 415x HMJ ,9 415x HMJ ,6 415x HMH ,8 600x HMH ,2 600x HMH ,2 600x HMH ,9 600x HMH ,4 600x HMK ,5 865x HMK ,9 865x HMK ,7 865x Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

20 EXTERNAL LOAD ON THE SHAFT END Calculation formulas for additional load on shaft and front bearing. The effect of external radial load on the shaft end has to be considered from two points of view: 1. Additional radial load transferred to the front bearing, P2. 2. Additional material stresses pro duced in the shaft by the bending moment caused by the external load, K. CALCULATION OF ADDITIONAL RADIAL LOAD ON FRONT BEARING P2 P2 = K (a+e) [N] e For bearing life calculations this P2 value has to be added to the P1 value in the life time formula. CALCULATION OF THE STRESS RESULTANT OF BENDING AND TORQUE STRESSES Shaft material: 42CrMo4 (W. No ) Comparable with 708M40 (BS970) and AISI Proof stress (0,2%): 635 N/mm 2 Tensile strenght: N/mm 2 Elongation: 12% Allowable stress As a guide line the resultant stress σr should not exeed 315 N/mm 2 (safety factor = 2). σb = K a [N/mm2 ] Wb τ = T 10 3 [N/mm 2 ] Wp σr = σ b2 + 3 τ 2 [N/mm 2 ] T [Nm] = torque in motor shaft. See torque-pressure diagram for the actual motor. σb [N/mm 2 ]= bending stress in shaft due to external load K. τ [N/mm 2 ] = shear stress in shaft due to torque T. σr [N/mm 2 ] = resultant material stress (tensile or compression). AXIAL LOAD ON THE SHAFT On a cylindrical bearing an axial load will not effect the radial load capacity. It is considered as a rule of thumb that a cylindrical bearing rotating at moderate speed can carry an axial load of 5% of the given radial load value. The motor type HMB can be furnished with taper roller bearings for use in applications where the motor shaft has to carry large axial loads. Please contact us for more informations. Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 21

21 INTERNAL PRESSURE LOSSES IN MOTORS AND SLIDE VALVES The graph below shows the oil pressure required to drive an unloaded motor at various oil deliveries. The oil pressure required to drive an unloaded motor mainly consists of dynamic pressure losses inside the motor. The values given in the graphs below refer to an oil viscosity of approx. 36 cst. For oils with higher viscosity the pressure losses will only have a moderate increase. Boost pressure When the motor is working as a pump (i.e. overrunning loads) it is important that the motor is supplied with sufficient oil to avoid cavitation. The necessary feed pressure at the oil inlet can be estimated from the below pressure loss graphs. The minimum inlet pressure should be 1,6 times the pressure taken from the graphs, + the pressure in the motor casing (drain pressure). Using two inlet and two outlet ports A, Aʼ and B, Bʼ the pressure difference is reduced approximately 30% on the 500 l/min slide valve. Two outlet- and inlet ports are standard features on 9 cylinder motors. 22 Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

22 OIL LEAKAGE The slide valves on the Bauer motors are of a rigid design giving little distortion even under pressure. The leakage values are therefore relatively small. See below curves indicating the oil leakage in the different slide valves and motors. Drain T P NOTE In a closed hydraulic circut the motor casing leakage has to be compensated by the delivery of the booster pump only. The slide valve leakage remains in the circuit. The motor casing leakage must always be drained. MOTOR CASING LEAKAGE QR Leakage to the motor casing from piston, pistons pins, connection rods and slide valve ends 1). SLIDE VALVE LEAKAGE QS Leakage from the pressure side to return side of the slide valve 1). Total leakage QT = QR + QS The speed of the motor has a relatively small influence on the leakage. The values in the graphs show aver - age values of motor leakages in the normal speed range. The curves refer to an oil viscosity of 36 cst. 1 ) In our test procedure the motor casing leakage is measured when the motor is rotating. The slide valve leakage is measured when the motor is not rotating. Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 23

23 HYDRAULIC MOTORS FOR WINCHES WITHOUT MECHANICAL BRAKES The pistons connecting rods on the Bauer motors are equipped with retainer rings causing mechanical return of the pistons in case of cavitation, and when the motor is working as a pump. This feature, together with a low leakage rate, makes the motors suitable for load control equipment (e.g. winches) without mechanical brakes. See piping diagram to the right. fig. I LOAD CONTROL VALVE RECOMMENDATION When needed, a pilot-pressure operated valve should be used for load control on Bauer motors (see connection diagram fig. I). A relief valve used as a load control valve should not be used (indicated on connection diagram fig. II). On idle running this arrangement will have maximum relief valve pres - sure on both sides of the motor (pressure and return side). This will give too high back-pressure in the motor. fig. II BACK-PRESSURE In general the back-pressure should be kept as low as possible. The design of some applications results in continous pressure on both inlet- and outlet ports. In such cases, the lowest pressure of the two ports must not exceed 60 bar on HMB and 45 bar on HMJ, HMH and HMK. If higher back-pressure is desired, e.g. when motors are working in series, please contact us. Too high back-pressure will reduce the play in large eccentric roller bearings. This might disturb the function of the bearing. However, the back-pressure must offer a sufficient margin to avoid cavitation. For more information about cavitation, see «Boost Pressure» on page Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

24 OIL PRESSURE IN THE MOTOR CASING (DRAIN PRESSURE). To reduce excessive wear on the rotating shaft seal, the pressure in the motor casing (drain pressure) should normally be kept as low as possible. For motors working in con - tinuous service, the pressure should not exceed 1 bar. For motors used on anchor winches and capstans on ships, the drain line is usually connected the main return line. This line often has a considerable lenght, which gives a high oil friction when operating at low temperatures. With such an arrangement the drain pressure in the motor casing will also increase. As the operation intervals and rotation speed for these applications are limited, a drain pressure up to 10 bar can be accepted. In this case a suit - able shaft seal must be mounted (see page 26). As a blow-out protection of the motor casing against peak (shock) pressure, the motor is provided with a pressure relief valve located in one of the drain outlets. The relief valve pressure is set to 20 bar for HMB and 15 bar for HMJ, HMH and HMK. It is always advisable to mount a check valve (non-return valve) in the drain outlet in order to protect the motor casing from possible pressure shocks in the main drain line. OIL CIRCULATION THROUGH MOTOR CASING For motors working continuously at high pressure or relatively high speed, the oil temperature in the casing might get too high. In this case circulation of some of the return oil through connection points with 3/4ʼʼ BSP threads is recommended. It is important that the circulation outlet is connected to the highest of these connection points. To obtain a circulation pressure differential (of approx. 0,5 bar) in an open hydraulic circuit, a slight restriction or a spring loaded valve may be installed in the return line of the motor. In closed circuit systems the return oil from the booster pump can be used for casing circulation. Because of the low internal leakage rate of the Bauer motors, we recommend oil circulation on motors working with a continuous effect larger than 11 kw (15 hk). HYDRAULIC FLUIDS MINERAL OILS A good quality mineral-based oil which preferably incorporates antiwear and anti-foaming additives, oxidation and corrosion protection should be used. FIRE-RESISTANCE FLUIDS Synthetic fluids (e.g. phosphate ester) and water based fluids (water emulsions and water glycols) only to be used after consulting the manufacturer. All hydraulic fluid must be within the viscosity limits given below. VISCOSITY In an open hydraulic circuit, the lubrication requirements of the hydraulic pumps are usually the deciding factor for the minimum viscosity of the hydraulic fluid. For the Bauer motors it has become normal practice to accept the same viscosity limitations as required for the pumps. As a guidance note we will recommend the following viscosity values: 1. For motors in intermittent service: - motors for manoeuvring of ship hatches, viscosity not lower than 12 cst. - motors for excavators, winches and normal equipment, viscocity not lower than 16 cst. 2. For motors in continuos service: - viscosity not lower than 23 cst. FILTRATION Due to the design, the Bauer motors are in general less sensitve to impurities and pollution than the hydraulic system in which they operate. Hence the filtration requirements are usually limited by the other components within the hydraulic system. However, filters of 25 micron or less are recommended. Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no 25

25 SHAFT SEALS AND CORROSION PROTECTION ON MOTOR SHAFTS The sketches below indicate three different shaft seal design. Special seal arrangements are available e.g. on motors working under water, and for phosphate- and water based fluids. Please contact us for futher information when special seal arrangement is required. PART DESCRIPTION ❶ Single acting hydraulic seal. This seal has a large sealing area, and the sensitivity to impurities and corrosion is therefore small. The generation of friction heat is larger than on lip seals, and based on experience we have found the following limits on the shaft speed: Up to 50 rev/min for ø90 mm shaft, 45 rev/min for ø100 mm shaft and 35 rev/min for ø125 mm shaft. The seals can be used for maximum drain pressure. ❷ Stripping ring for protection against dust, particles and water. Bauer Hydraulics uses as standard a heavy duty metal caged stripping ring. ❸ Speedi sleeve for protection against corrosion is standard on all motors. The Speedi sleeve is a chromium - plated stainless steel sleeve, and it is pressed on the shaft and fastened with a two component epoxy plastic compound. It is also used for repair work on worn and corroded shafts to make a new sealing surface. ❹ Rotary seal for high shaft speed. This seal has no limitation on shaft speed. The drain pressure should normally not exceed 10 bar. ❷ ❶ ❸ ❹ ❹ Standard design. Key «N» in motor identification. Design for high speed. Key «M» in motor identification. Special design on request Key «X» in motor identification. Arrangement as shown is often used when a motor is mounted on a gear box. 26 Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , bauer@bauer.no

26 NOTES: Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , 27

27 NOTES: 28 Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax ,

28 NOTES: Bauer Hydraulic Motors AS, P.O. Box 100, N-5501 Haugesund, Tel.: , Fax , 29

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30 Bauer Hydraulic Motors AS: With 50 years of experience in hydraulic design and manufacturing, Bauer Hydraulic Motors AS produces an extensive range of high-pressure hydraulic equipment for the shipbuilding sector as well as for offshore and landbased industry. Bauer Hydraulic Motors products include high-torque, slow-speed hydraulic motors, high-pressure hydraulic cylinders and hydraulic control valves. Bauer Hydraulic Motors AS: P.O. Box 100, 5501 Haugesund, Norway tel.: fax: website: