hydraulic motor curve 1

High Torque

Low Speed

Hydraulic Motors

3HYDRAULICS

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

0 – 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 2000.

As time passes, a development and improvement in design willnormally take place. Specification of items may therefore beliable to change without notice.

INDEX

4 Brødr. Bauer-Nilsen AS, P.O. Box 100, N-5501 Haugesund, Tel.: +47 52 70 77 70, Fax +47 52 70 77 99, E-mail: [email protected]

HIGH-TORQUE LOW-SPEED HYDRAULIC MOTORS

HIGH PRESSURE HYDRAULIC CYLINDERS

HYDRAULIC CONTROL VALVES

HYDRAULIC WINCHES AND JIGGER WINCHES

Double-acting and single-acting cylinders with strokes up to 12000 mm;diameter 25-600 mm and larger telescopic cylinders are delivered to therules of the different classification societies.A great number of different cylinder designs are available, trunnion orflange mountings and internal mechanical locking.

Bauer´s design of hydraulic manoeuvring valves combines the effect of abalanced 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 thedelivery 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 4001.

For doors, containerlifts, ramps and RO-RO ramps we deliver jiggerwinches and hydraulic winches with a large range of different sizes andcapacities to meet customer requierements.

Producer of high pressure hydraulicsWith 50 years of experience in hydraulic design and manufacturing, Brødr.Bauer-Nilsen AS produces an extensive range of high-pressure hydraulicequipment 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.

The Bauer Hydraulics production programme concist of different standard motors size rangingfrom 1.8 l/rev to 32.6 l/rev with turning moments up to 138 000 Nm. All motors are radial pistontype with heavy roller bearings on shaft end eccentric. Internal friction is very low and startingtorque 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 for the motor. The circulation valve (HR 14)offers a very smooth changing of speed/torque even if the motor is loaded/running.By introducing larger pistons diameters is existing motor designs, applicable for motors subjectedto 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 nowmade with a strengthened motor casing. These motors are now better suited to be installed onlarge vessels by connecting the drain lines directly to the hydraulic systems common return line.

Brødr. Bauer-Nilsen AS, P.O. Box 100, N-5501 Haugesund, Tel.: +47 52 70 77 70, Fax +47 52 70 77 99, E-mail: [email protected] 5HYDRAULICS

BAUER MOTOR TYPE HMJ, HMH AND HMK

TECHNICAL DESCRIPTION

The Bauer motors are high torquelow speed radial piston motors with 5 to 18 cylinders.The motor shaft is equipped with two roller bearings, and the eccenterhas a large roller bearing. Mechani-cal losses in the transmission aresmall, and the motor has a highstarting torque. – The oil supply tothe cylinders is directed by ahydraulically balanced slide system.The slide therefore runs with verylow friction forces – even at thehighest hydraulic pressure.

Bauer motor type HMK has, except for two cylinder banks, in principle thesame design as HMJ and HMH.

BAUER MOTOR TYPE HMB

Piston pins connec-tion rods and slidevalves are hydro-statically balanced.

The different motorsizes are built up ona limited number ofstandard parts.

Cylindrical rollerbearings are standard

Dual load controlvalve directlymounted on slidevalve also available.

Large roller bearingson the eccenter.

Cylindrical rollerbearings are standard.

Two speed slide valvesalso available.

5 to 18 cylinders inthe motor casing.


MOTOR TYPE HMB – DIMENSIONS AND TECHNICAL DATA

MOTOR TYPE HMB5 – 1.8/2.3/2.8



HMB5 – 1.8/2.3/2.8-1 -T with 300 l/min slide valve. HMB5 – 1.8/2.3/2.8-1 -T with 500 l/min slide valve.

HMB5 – 2.6/3.3/4.0-1 -T with 300 l/min slide valve. HMB5 – 2.6/3.3-1/4.0 -T with 500 l/min slide valve.

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.

OIL CONNECTIONConnections a and b on300 l/min slide valve – 1’’ BSP.Connections a and b on 500 l/min slide valve – 1 1/2’’ BSP.On 7 cylinder motors connectionthrough adapters with length 95 mm.

DRAINConnection c: 3/4’’ BSP.Drain always to be connected to thehighest connection point.ROTATIONClockwise rotation view from shaftend: b-oil inlet and a-oil outlet.

TIGHTENING OF MOUNTINGSCREWSTightening torque on screw M16 (quality 8.8): 180 NmTightening torque on screw M20 (quality 8.8): 360 Nm

17

20

METRIC

US

HMB5-1.8

HMB5-2.3

HMB5-2.6

HMB5-2.8

HMB5-3.3

HMB5-4.0

HMB7-3.7

HMB7-4.6

HMB7-5.6


TECHNICAL DATA - HMB

litrerpm bar bar bar

Nm Nmkg kgrev bar bar

in3

rpm psi psi psilbf • ft lbf • ft

lb lbrev psi psi

1,82 330 315 280 200 24,6 27,5 204 231

111 330 4570 4060 2900 1,25 1,40 450 509

2,27 265 315 250 180 30,7 34,3 210 237

139 265 4570 3630 2610 1,56 1,74 463 522

2,61 230 315 280 200 35,3 39,5 265 292

159 230 4570 4060 2900 1,80 2,00 584 644

2,77 217 315 220 140 37,4 41,8 218 245

169 217 4570 3190 2030 1,90 2,12 481 540

3,26 184 315 250 180 44,2 49,4 270 297

200 184 4570 3630 2610 2,25 2,51 595 655

3,98 150 315 250 180 54,0 60,3 280 307

243 150 4570 3630 2610 2,75 3,07 617 677

3,65 164 315 280 180 50,7 55,3 285 312

223 164 4570 4060 2610 2,58 2,81 628 688

4,56 131 315 250 160 63,3 69,1 290 317

279 131 4570 3630 2320 3,22 3,51 639 699

5,58 108 315 220 140 77,5 84,6 300 327

341 108 4570 3190 2030 3,94 4,30 661 721

DisplacementSpeed with oil delivery 600 l/min

1) Max workingpressure, short

duration

2) Workingpressure, inter-

mittent duty

3) Workingpressure, con-tinuous duty

4) Average specific

starting torque

5) Specificrunningtorque

Weight (dry)w/300 l/min. slide valve

Weight (dry)w/500 l/min.slide valve

1) 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.

ALTERNATIVE SHAFT TYPES:

DIFFERENT MOTOR VERSIONS AND APPLICATIONSThe 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 externalradial 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).

Parallel shaft: Splines BS 3550: 1963. Splines DIN 5480Key: 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 5480Key: 1’’x1’’x135 (BS46) 6/12 pitch, flat root side fit WA100x3x30x32xh6x9e

HMB5-2.6/3.3/4.0HMB7-3.7/4.6/5.6 110


15 000 lbf.ft

10 000 lbf.ft

5 000 lbf.ft

5000 Nm

10 000 Nm

15 000 Nm

20 000 Nm

50 100 150 200 250 300 bar

1 000 2 000 3 000 4 000 psi

HMB7-5.6

HMB7-4.6

HMB5-4.0

HMB7-3.7

HMB5-3.3

HMB5-2.6

HMB5-2.3

HMB5-1.8

HMB5-2.8

TORQUE – PRESSURE DIAGRAM

Reference to old and newdesignation.

Old designation New designation

HMB5-8564 HMB5-1.8HMB5-9564 HMB5-2.3HMB5-8592 HMB5-2.6HMB5-9592 HMB5-3.3HMB7-8592 HMB7-3.7HMB7-9592 HMB7-4.6

ORDERING CODE FOR MOTOR TYPE HMB

Example: HMB 5 - 2.6 - 1 - T - - 3 - Y - N - No. of cylinders: 55-7 7

Displacement (l/rev):1.8-5.6

No off shaft ends:1 shaft end 12 shaft ends 2

Shaft type:Taper TParallel PSpline S

Mounting type:Standard Bauer mounting: no codeFront mounting flange F

Slide valve (one speed):300 l/min 3500 l/min 5

Shaft bearings:Cylindrical roller YTaper roller A

Shaft seals:Single acting, nutring NHigh speed seal MSpecial arrangements X

Other details:(special hydr. fluidsvalves, etc.)


MOTOR TYPE HMJ AND HMH – DIMENSIONS AND TECNICAL DATA

MOTOR TYPE HMJ9-4.7/5.9/7.2

MOTOR TYPE HMH5-7.3 HMH7-10.2/12.7 HMH9-13.2/16.3

OIL CONNECTIONConnections a and b on slide valve: 1 1/2’’ BSP.On 7 and 9 cylinder motors connectionthrough adapters with length 95 mm.

ROTATIONClockwise rotation view from shaftend: b-oil inlet and a-oil outlet.

DRAINConnection c: 3/4’’ BSP.PCD 618 on HMJ motorPCD 845 on HMH motorDrain always to be connected to thehighest connection point. For specialadapters on motors working with shaftupwards, consult us.

TIGHTENING OF MOUNTINGSCREWSTightening torque on screw M16 (quality 8.8): 180 NmTightening torque on screw M20 (quality 8.8): 360 Nm

Front mounting

Front mounting


Parallel shaft: Splines BS 3550: 1963. Splines DIN 5480Key: 1’’x1’’x135 BS46 6/12 pitch, flat root side fit WA100x3x30x32xh6x9c

HMJ9-4.7/5.9/7.2

Parallel shaft Splines DIN 5480Key: 1 1/4’’x1 1/4’’x160 BS46 WA120x3x30x38xh6hx9e

HMH5-7.3HMH7-10.2/12.7HMH9-13.2/16.3

ALTERNATIVE SHAFT TYPES:

DIFFERENT MOTOR VERSIONS AND APPLICATIONSThe 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 withtwo shaft connections (shaft on both sides). See page 17.

TECHNICAL DATA – HJM AND HMH



duration


mittent duty


4) Average specific

starting torque


Weight (dry)w/500 l/min. slide valve

6) Weight (dry)w/two-speed

slide valve. HR12

1) 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 HR14.



in3


lb lbrev psi psi

4,70 128 315 250 150 67,5 71,5 522 550

287 128 4570 3630 2180 3,43 3,63 1151 1213

5,87 102 280 230 140 84,3 89,2 545 573

359 102 4060 3340 2030 4,29 4,54 1202 1263

7,17 84 280 200 120 103,0 109,0 552 580

438 84 4060 2900 1740 5,23 5,52 1217 1279

7,30 82 315 250 200 98,9 110,4 885 N/A

446 82 4570 3630 2900 5,02 5,61 1951 N/A

10,22 59 315 250 180 141,2 154,2 945 N/A

624 59 4570 3630 2610 7,18 7,84 2083 N/A

12,72 47 280 230 140 175,7 191,8 953 N/A

777 47 4060 3340 2030 8,93 9,75 2101 N/A

13,14 46 280 250 160 189,1 199,6 1005 1033

802 46 4060 3630 2330 9,62 10,15 2216 2377

16,35 37 280 210 130 233,5 246,5 1015 1043

998 37 4060 3050 1890 11,87 12,54 2238 2299

METRIC

US

HMJ9-4.7

HMJ9-5.9

HMJ9-7.2

HMH5-7.3

HMH7-10.2

HMH7-12.7

HMH9-13.2

HMH9-16.3


50 000 lbf.ft

40 000 lbf.ft

30 000 lbf.ft 40 000 Nm

50 000 Nm

60 000 Nm

70 000 Nm

50 100 150 200 250 300 bar

1 000 2 000 3 000 4 000 psi

HMH9-16.3

HMH9-13.2

HMH7-10.2

HMJ9-7.2 & HMH5-7.3

HMJ9-5.9

HMJ9-4.7

20 000 lbf.ft

10 000 lbf.ft

30 000 Nm

20 000 Nm

10 000 Nm

HMH7-12.7

Example: HMJ 9 - 5.9 - 1 - T - - 5 - - N - Motor type: HMJ

HMHNo. of cylinders:5-9

Displacement (l/rev):4.7-7.2 (HMJ)7.3-16.3 (HMH)

No off shaft ends:1 shaft end 12 shaft ends 2


Mounting type:Standard Bauer mounting: no codeFront mounting flange F

Slidevalve one speed:500 l/min 5

Slide valve two-speed:speed ratios:9/6, 9/3, 9/0, 6/3Please contact us for other speed ratios.

Slide valve, two-speed:HR12, manual BHR12, hydraulic HHR14, hydraulic C



ORDERING CODE FOR MOTOR TYPE HMJ AND HMH

Reference to old and newdesignation.

Old designation New designationHMJ9-8592 HMJ9-4.7HMJ8-9592 HMJ8-5.2HMJ9-9592 HMJ9-5.9HMH5-130110 HMH5-7.3HMH7-130110 HMH5-10.2HMH9-130110 HMH9-13.2HMH9-145110 HMH9-16.3



MOTOR TYPE: HMK14-20.4 HMK18-26.4/32.6



in3


lb lbrev psi psi

20,4 49 315 250 180 282,4 308,4 1770 1880

1248 49 4570 3630 2610 14,36 15,68 3902 4145

26,4 38 280 250 160 378,2 398,2 1880 1990

1604 38 4060 3630 2320 19,24 20,25 4145 4387

32,6 31 280 210 130 467,0 493,0 1910 2020

1996 31 4060 3050 1890 23,74 25,08 4211 4453



duration


mittent duty


Average specific

starting torque


Weight (dry)w/1000 l/min slide valve

Weight (dry)w/two-speed

slide valve HR22

METRIC

US

HMK14-20.4

HMK18-26.4

HMK18-32.6

1) 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.

MOTOR TYPE HMK – DIMENSIONS AND TECHNICAL DATA

MOTOR TYPE HMK14-20.4 HMK18-26.4/32.6

OIL CONNECTIONConnections a and b on slide valve: 1 1/2’’ BSP.Connection through adapters withlength 95 mm.

DRAINConnection c: 3/4’’ BSP on PCD 845.Drain always to be connected to thehighest connection point. For specialadapters on motors working with shaftpointing upwards, please consult us.

ROTATIONClockwise rotation view from shaft end: Oil inlet: connection bOil outlet: connection a

TIGHTENING OF MOUNTINGSCREWSTightening torque on screw M20 (quality 8.8): 360 Nm

ALTERNATIVE SHAFT TYPES:Splines:WA150x3x30x48xh6x9e DIN 5480

Parallel shaft on request.



100 000 lbf.ft

80 000 lbf.ft

60 000 lbf.ft 80 000 Nm

100 000 Nm

120 000 Nm

140 000 Nm

50 100 150 200 250 300 bar

1 000 2 000 3 000 4 000 psi

H

MK18-32.6

HMK18-26.4

HMK14-20.4

40 000 lbf.ft

20 000 lbf.ft

60 000 Nm

40 000 Nm

20 000 Nm

Example: HMK 18 - 32.6 - T - 10 - N - No. of cylinders: 1414-18 18

Displacement (l/rev):20.4-32.6


Slide valve HR20(one speed):1000 l/min 10

Slide valve HR22(two-speed):Speed ratios 18/9, 18/0, 14/7, 14/0Please contact us forother speed ratios.



ORDERING CODE – HMK


TWO SPEED MOTORS

HMJ and HMH motor with two-speed slide valve HR12

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 twodifferent principles to obtain the two speed/torque function. One by moving the slide valve spindle (HR12) and theother by disconnecting cylinders through a circulation valve (HR14 and HR22). All cylinders are engaged when runningat slow speed/ high torque, and some cylinders are disconnected when running with high speed/low torque.Standard speed/torque ratios obtainable are as follows: 6/3, 9/3, 9/6,14/7 and 18/9. When other speed/torque ratios arerequired, please contact us. The ratio 8/4 is infrequently used. Running a motor on 4 cylinders gives a very uneventorque and angular speed (see diagram page 19.) This might cause uncontrolled vibrations. The circulation valve can alsobe used for free-wheeling. In this case, cylinders are disconnected, e.g. 7/0, 9/0, 14/0, 18/0

Hydraulically operated Manually operated

Angular position of ports

Port dimensionsa and b, 11/2 ’’ BSPd = 3/8’’ BSP

The slide valve HR12 can also be delivered asmanually operated. The manually operated lever hastwo positions. One position gives high speed/lowtorque, and other position gives low speed/hightorque. The force needed to change position is low,approximately 5 kg.

dim. A B C D E F G

mm 824 260 234 227 322 756 112

in 32,5 10,24 9,21 8,94 12,68 29,80 4,41

mm 945 260 234 227 322 877 112

in 37,2 10,24 9,21 8,94 12,68 34,53 4,41

Motor type

HMJ

HMH

Displacement/speed ratio

RATIO

9/6 9/3

4.7/3.1 4.7/1.65.9/3.9 5.9/2.07.2/4.8 7.2/2.4

13.2/8.8 13.2/4.4

16.3/10.9 16.3/5.4

HYDRAULIC OPERATIONS MANUAL OPERATION

The two-speed slide valves HR14 and HR22 arehydraulically operated. High speed is optained byapplying 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 pilotpressure.


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 andrunning. By this arrangement the cross-connected cylinders are emptied and drained to tank, hence we avoidoverheating the oil.

dim. A B

mm 815 570

in 32,09 22,44

mm 935 635

in 36,81 25,00

Motor type

HMJ

HMH

Displacement/speed ratio

RATIO9/6 9/3

4.7/3.1 4.7/1.65.9/3.9 5.9/2.07.2/4.2 7.2/2.4

13.8/8.8 13.2/4.416.3/10.9 16.3/5.4

HMK motor with two-speed slide valve HR22

Bauer motor type, HMK, has twobanks of cylinders. This design offersseveral speed/torque ratios e.g. 18/9,18/0, 14/7, 14/0. The HMK motorcan also be furnished with cylinderswith different diameter.

For further dimensions, see technicaldata for motors on page 12. Somedimensions might be changedwithout futher notice.


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 HR12slide 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 HMK18-32.6 with slide valve HR22.


TWO SHAFT ENDS

HMH and HMJ motors HMB motors

All dimensions, shaft and flange options as given on previous pages.

LOAD CONTROL VALVES

On the HMH and HMJ motors the slide valve is driven by a pair of conical gearwheels. The valve is of standarddesign. Two speed valves are also available.

The HMB motors with two shaft ends, have a slide valvearrangement consisting of a cam-driven spool valve foreach cylinder.

Motor type A B C D E F G HHMB5-1.8/2.3/2.8 765 422 210 127 122 110 47 75

HMB5-2.6/3.3/4.0 820 422 240 149 145 132 52 90

HMB7-3.7/4.6/5.6 820 422 240 149 145 132 52 90

The 300 l/min slide valve can beequipped with the following dual loadcontrol valves:

1. The type HV 270 for flows less orequal to 40 l/min

2. The type HV 272 for flows less orequal to 80 l/min

3. The type HV 203 for flows less orequal to 80 l/min. This valve isfurnished with an adjustabledamping.

Please contact us for technical dataand dimensional drawing of thecontrol valves, or when larger flowrates are required.

3/4

a b


INTERCHANGEABLE FRONT-MOUNTING OPTIONS

HMB5-1.8/2.3/2.8 HMB5-1.8/2.3/2.8HMB5-2.6/3.3/4.0 HMB5-2.6/3.3/4.0

5 holes ø21 equiangular on PCD 419,1 (16,5’’) as shown.

HMB7-3.7/6.6/5.6 HMB 7-3.7/4.6/5.67 holes ø21 equiangular on PCD 520,7 (20,5’’) as shown.

Tolerance A, h8Tolerance B, e9

dim. A B C D E Fmm 210 381 419,1 463 108 33

in 8,27 15 16,5 18,23 4,25 1,3

mm 2,40 381 419,1 476 121 35

in 9,45 15 16,5 18,74 4,75 1,38

mm 240 457,2 520,7 564 109,5 33

in 9,45 18 20,5 22,2 4,31 1,3

Motor type

HMB5-1.8/2.3/2.8

HMB5-2.6/3.3/4.0

HMB7-3.7/4.6/5.6


EFFECT OF PULSATION ON STARTING AND RUNNING TORQUE

0° 45° 90° 135° 180° 0° 45° 90° 135° 180° 0° 45° 90° 135° 180°

pulsation 23,4% pulsation 29,9% pulsation 7,4%3 cyl. 4 cyl. 5 cyl.

0° 45° 90° 135° 180° 0° 45° 90° 135° 180° 0° 45° 90° 135° 180°

pulsation 13,6% pulsation 4,2% pulsation 7,7%6 cyl. 7 cyl. 8 cyl.

0° 45° 90° 135° 180° 0° 45° 90° 135° 180° 225°

pulsation 2,2% pulsation 11,5%

9 cyl. 9 cyl. used as 6 cyl. (ref. two speed motors)

The most distinct characteristics given by the above curves are that odd-number cylinders in general have a muchsmoother pulsation then even-number cylinder. A pulsation of 29,9% as illustrated in curve for four cylinders isregarded 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.

Starting torque is dependent on the cylinders starting position. Low starting torque will occur when the cylinders arepositioned at an angle corresponding to the low- and sharp bottoms of the pulsation curves.


Lifetime formulaL= bearing life in million revolutions

[106 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]

SERVICE LIFE OF THE MOTOR

P1 = F.p [N]

P = P1+ P2 [N]

L = (C)10

[106 rev.]P 3

F C Shaft dia. Bending Shear b e[N/bar] [N] d [mm] Wb [mm] Wp [mm] [mm] [mm]

HMB5-1.8 459,1 340x103 90 71570 143140 206 172

HMB5-2.3 573,4 340x103 90 71570 143140 206 172

HMB5-2.6 459,1 415x103 100 98170 196340 207 178

HMB5-2.8 700,5 340x103 90 71570 143140 206 172

HMB5-3.3 573,4 415x103 100 98170 196340 207 178

HMB7-3.7 637,5 415x103 100 98170 196340 207 178

HMB5-4.0 700,5 415x103 100 98170 196340 207 178

HMB7-4.6 796,3 415x103 100 98170 196340 207 178

HMB7-5.6 972,5 415x103 100 98170 196340 207 178

HMJ9-4.7 817,0 415x103 100 98170 196340 212 168

HMJ9-5.9 1041,9 415x103 100 98170 196340 212 168

HMJ9-7.2 1246,6 415x103 100 98170 196340 212 168

HMH5-7.3 1073,8 600x103 130 215690 431480 283 206

HMH7-10.2 1491,2 600x103 130 215690 431480 283 206

HMH7-12.7 1855,2 600x103 130 215690 431480 283 206

HMH9-13.2 1910,9 600x103 130 215690 431480 283 206

HMH9-16.3 2377,4 600x103 130 215690 431480 283 206

HMK14-20.4 2982,5 865x103 155 365590 731180 308 432

HMK18-26.4 3821,9 865x103 155 365590 731180 308 432

HMK18-32.6 4754,7 865x103 155 365590 731180 308 432

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]

Experience shows that the limiting factor in the lifetime of a hydraulic motor is the bearing life of the roller bearings onthe shaft. The estimated bearing life is calculated according to the standard formula issued by the bearing producers.

Calculation formulas for additionalload on shaft and front bearing.

The effect of external radial load onthe shaft end has to be consideredfrom two points of view:

1. Additional radial load transferred to the front bearing, P2.

2. Additional material stresses produced in the shaft by thebending moment caused by theexternal load, K.

EXTERNAL LOAD ON THE SHAFT END


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

σb = K • a [N/mm2]Wb

T [Nm] = torque in motor shaft. See torque-pressurediagram for the actual motor.

σb [N/mm2]= bending stress in shaftdue to external load K.

τ [N/mm2] = shear stress in shaft due to torque T.

σr [N/mm2] = resultant material stress (tensile or compression).

τ = T • 103 [N/mm2]

Wp

σr = σb2+ 3 • τ2 [N/mm2]

Shaft material:42CrMo4 (W. No. 1.7225)Comparable with 708M40 (BS970)and AISI 4140.Proof stress (0,2%) = 635 N/mm2

Tensile strenght = 880-1080 N/mm2

Elongation 12%

Allowable stressAs a guide line the resultant stressσr should not exeed 315 N/mm2

(safety factor = 2).

AXIAL LOAD ON THE SHAFT

On a cylindrical bearing an axial loadwill not effect the radial load capacity.It is considered as a rule of thumbthat a cylindrical bearing rotating atmoderate speed can carry an axialload of 5% of the given radial loadvalue.

The motor type HMB can befurnished with taper roller bearingsfor use in applications where themotor shaft has to carry large axialloads. Please contact us for moreinformations.


INTERNAL PRESSURE LOSSES IN MOTORS AND SLIDE VALVES

The graph below shows the oil pres-sure required to drive an unloadedmotor at various oil deliveries. The oilpressure required to drive a unloadedmotor mainly consists of dynamicpressure losses inside the motor.The values given in the graphs belowrefer to an oil viscosity of approx. 36 cSt. For oils with higher viscositythe pressure losses will only have amoderate increase.

Boost pressureWhen the motor is working as apump (i.e. overrunning loads) it isimportant that the motor is suppliedwith sufficient oil to avoid cavitiation.The necessary feed pressure at theoil inlet can be estimated from thebelow pressure loss graphs. Theminimum inlet pressure should be 1,6times the pressure taken from thegraphs, + the pressure in the motorcasing (drain pressure).

Using two inlet and two outlet ports A, A’ and B, B’ the pressuredifference is reduced approx. 30% on the 500 l/min slide valve. Two outlet- and inlet ports are standard features on 9 cyl. motors.


OIL LEAKAGE

The slide valves on the Bauermotors are of a rigid design givinglittle distortion even under pressure.The leakage values are thereforerelatively small.

See below curves indicating the oilleakage in the different slide valvesand motors.

NOTE

In a closed hydraulic circut themotor casing leakage has to becompensated by the delivery of thebooster pump only. The slide valveleakage remains in the circuit.The motor casing leakage mustalways be drained.

SLIDE VALVE LEAKAGE QS

Leakage from the pressure side toreturn side of the slide valve1).

MOTOR CASING LEAKAGE QR

Leakage to the motor casing from piston, pistons pins, connection rodsand and slide valve ends1). The speed of the motor has a relati-

vely small influence on the leakage.The values in the graphs show aver-age values of motor leakages in thenormal speed range. The curvesrefer to an oil viscosity of 36 cSt.

Total leakage QT = QR + QS

Drain

T P

1) In our test procedure the motor casing leakage ismeasured when the motor is rotating. Theslide valve leakage is measured when the motor is not rotating.


The pistons connecting rods on theBauer motors are equipped withretainer rings causing mechanicalreturn of the pistons in case of cavitation, and when the motor isworking as a pump. This feature, together with a low leakage rate, makes the motors suitable for loadcontrol equipment (e.g. winches) without mechanical brakes. See piping diagram to the right.

HYDRAULIC MOTORS FOR WINCHES WITHOUT MECHANICAL BRAKES

When needed, a pilot-pressureoperated valve should be used forload control on Bauer motors(see connection diagram fig. I).

A relief valve used as a load controlvalve should not be used (indicatedon connection diagram fig. II). Onidle running this arrangement willhave maximum relief valve pressu-re on both sides of the motor (pres-sure and return side). This will givetoo high back-pressure in themotor.

LOAD CONTROL VALVE RECOMMENDATION

In general the back-pressure shouldbe kept as low as possible. Thedesign of some applications results incontinous pressure on both inlet- andoutlet ports. In such cases, the lowestpressure of the two ports must notexceed 60 bar on HMB and 45 bar onHMJ, HMH and HMK. If higher back-pressure is desired, e.g. whenmotors are working in series, pleasecontact us.

Too high back-pressure will reducethe play in large eccentric rollerbearings. This might disturb thefunction of the bearing.However, the back-pressure mustoffer a sufficient margin to avoidcavitation. For more informationabout cavitation, see «BoostPressure» on page 22.

BACK-PRESSURE

fig. I

fig. II


HYDRAULIC FLUIDS

MINERAL OILS

A good quality mineral-based oilwhich preferably incorporates anti-wear and anti-foaming additives,oxidation and corrosion protectionshould 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 themanufacturer.

All hydraulic fluid must be within theviscosity limits given below.

VISCOSITY

In an open hydraulic circuit, the lubrication requirements of thehydraulic pumps are usually the deciding factor for the minimumviscosity of the hydraulic fluid. Forthe Bauer motors it has become a normal practice to accept the sameviscosity limitations as required forthe pumps.

As a guidance note we will recom-mend the following viscosity values:1. For motors in intermittent service:

- motors for manoeuvring of shiphatches, viscosity not lower than12 cSt.

- motors for excavators, winchesand normal equipment, viscocitynot lower than 16 cSt.

2. For motors in continuos service:- viscosity not lower than 23 cSt.

FILTRATION

Due to the design, the Bauer motorsare in general less sensitve to impu-rities and pollution than the hydrau-lic system in which they operate.Hence the filtration requirements areusually limited by the othercomponents within the hydraulicsystem. However, filters of 25micron or less are recommended.

To reduce excessive wear on therotating shaft seal, the pressure inthe motor casing (drain pressure)should normally be kept as low aspossible. For motors working in con-tinuous service, the pressure shouldnot exceed 1 bar.

For motors used on anchor winchesand capstans on ships, the drain lineis usually connected the main returnline. This line often has a considera-ble lenght, which gives a high oil fric-tion when operating at low tempera-

tures. With such an arrangement thedrain pressure in the motor casingwill also increase.

As the operation intervals and rotati-on speed for these applications arelimited, a drain pressure up to 10 barcan be accepted. In this case a suit-able shaft seal must be mounted(see page 26). As a blow-out protec-tion of the motor casing against peak(shock) pressure, the motor is provi-ded with a pressure relief valve loca-ted 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 acheck valve (non-return valve) inthe drain outlet in order to protectthe motor casing from possiblepressure shocks in the main drainline.

OIL PRESSURE IN THE MOTOR CASING (DRAIN PRESSURE).

For motors working continuously athigh pressure or relatively high speed, the oil temperature in thecasing may get too high. In this casecirculation of some of the return oilthrough connection points with 3/4’’BSP threads is recommended. It isimportant that the circulation outlet isconnected to the highest of theseconnection points.

To obtain a circulation pressure diffe-rential (of approx. 0,5 bar) in anopen hydraulic circuit, a slightrestriction or a spring loaded valvemay be installed in the return line ofthe motor. In closed circuit systemsthe return oil from the booster pumpcan be used for casing circulation.

Because of the low internal leakagerate of the Bauer motors, we recom-mend oil circulation on motors wor-king with a continuous effect largerthan 11 kW (15 hk).

OIL CIRCULATION THROUGH MOTOR CASING


The drawing below indicate threedifferent shaft seal design. Specialseal arrangements are available e.g.on motors working under water, andfor phosphate- and water basedfluids.

Please contact us for futherinformation when special sealarrangement is required.

SHAFT SEALS AND CORROSION PROTECTION ON MOTOR SHAFTS

❶Single acting hydraulic seal.This seal has a large sealing area,and the sensitivity to impurities andcorrosion is therefore small. Thegeneration of friction heat is largerthan on lip seals, and based onexperience we have found thefollowing 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. Theseals can be used for maximum drainpressure.

❷Stripping ring for protectionagainst dust, particles and water.Bauer use as standard a heavy dutymetal caged stripping ring.

❸Speedi sleeve for protectionagainst corrosion is standard onall motors. The Speedi sleeve is a chromium-plated stainless steel sleeve, an it ispressed on the shaft and fastenedwith a two component epoxy plasticcompound. It is also used for repairwork on worn and corroded shafts tomake a new sealing surface.

❹Rotary seal for high shaft speed.This seal has no limitation on shaftspeed. The drain pressure shouldnormally not exceed 10 bar.

PART DESCRIPTION

❷ ❶

❸ ❹ ❹

Standard design.Key «N» in motor identification.

Design for high speed.Key «M» in motor identification.

Special design on requestKey «X» in motoridentification.Arrangement asshown is often usedwhen a motor ismounted on a gearbox.


NOTES:

Brødr. Bauer-Nilsen AS:

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.

Brødr. Bauer-Nilsen AS:P.O. Box 100, 5501 Haugesund, Norwaytel.: +47 52 70 77 70 fax: +47 52 70 77 99e-mail: [email protected] website: www.bauer.no

hydraulic motor curve 1

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