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    BD GD Catalog

    Uploaded by

    josue
    This document provides information on two series of radial piston hydraulic motors from SAI Hydraulics: the BD Series and GD Series. The BD Series uses a five cylinder crankshaft design and has features like adjustable displacement, freewheeling capability, and high starting torque efficiency. Displacement can be changed dynamically or statically on the BD1 and BD2 models. The GD Series is a nine cylinder design with dual displacement achieved by varying the shaft eccentric cam between minimum and maximum settings. This allows for a reduction in displacement and increase in speed. Performance data is provided for GD4 motors with displacements ranging from 11.78 to 62.45 cubic inches.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    BD GD Catalog

    Uploaded by

    josue
    123 views10 pages
    This document provides information on two series of radial piston hydraulic motors from SAI Hydraulics: the BD Series and GD Series. The BD Series uses a five cylinder crankshaft design and has features like adjustable displacement, freewheeling capability, and high starting torque efficiency. Displacement can be changed dynamically or statically on the BD1 and BD2 models. The GD Series is a nine cylinder design with dual displacement achieved by varying the shaft eccentric cam between minimum and maximum settings. This allows for a reduction in displacement and increase in speed. Performance data is provided for GD4 motors with displacements ranging from 11.78 to 62.45 cubic inches.

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    This document provides information on two series of radial piston hydraulic motors from SAI Hydraulics: the BD Series and GD Series. The BD Series uses a five cylinder crankshaft design and has features like adjustable displacement, freewheeling capability, and high starting torque efficiency. Displacement can be changed dynamically or statically on the BD1 and BD2 models. The GD Series is a nine cylinder design with dual displacement achieved by varying the shaft eccentric cam between minimum and maximum settings. This allows for a reduction in displacement and increase in speed. Performance data is provided for GD4 motors with displacements ranging from 11.78 to 62.45 cubic inches.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    123 views10 pages

    BD GD Catalog

    Uploaded by

    josue
    This document provides information on two series of radial piston hydraulic motors from SAI Hydraulics: the BD Series and GD Series. The BD Series uses a five cylinder crankshaft design and has features like adjustable displacement, freewheeling capability, and high starting torque efficiency. Displacement can be changed dynamically or statically on the BD1 and BD2 models. The GD Series is a nine cylinder design with dual displacement achieved by varying the shaft eccentric cam between minimum and maximum settings. This allows for a reduction in displacement and increase in speed. Performance data is provided for GD4 motors with displacements ranging from 11.78 to 62.45 cubic inches.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    The document discusses radial piston hydraulic motors from the BD and GD series, including their design features, specifications and performance characteristics.

    The BD series motors utilize a five cylinder crankshaft design with a sliding central bearing arrangement that allows for changing displacement, fitting of taper roller bearings, and a hollow through shaft option. They are capable of low speed operation with constant output torque.

    The GD series motors have a nine cylinder crankshaft design and utilize many proven components from previous motors for high performance and reliability. They have a smooth output torque due to their variable shaft eccentric cam design.

    HYDRAULIC MOTORS

    BD Series Motors GD Series Motors

    Crankshaft Design Radial Piston Hydraulic Motors

    BD GD
    CONTENTS BD SERIES MOTORS

    SERIES SERIES

    TECHNICAL CATALOG

    PAGE

    BD Series Design Features ............................................ 2 BD1 Series ..................................................................... 3 BD2 Series ..................................................................... 4 BD Series Order Codes ................................................. 6 GD SERIES MOTORS GD Series Design Features ........................................... 7 GD4 Series ..................................................................... 8

    012703REV0

    BD Series Motors
    GENERAL CHARACTERISTICS & FEATURES
    Five cylinder crankshaft design radial pistion hydraulic motor The BD Series motor utilizes many of the proven components from the GM Series motors, well known for their high performance and reliability. The innovative design of the new sliding central bearing arrangement, made possible by the latest materials and manufacturing techniques increases the range of possible options in SAI hydraulic motors. These include the possibility to change displacement, fit taper roller bearings for axial load capability, have a hollow through shaft option, and fit a counterbalance weight to smooth out high speed vibration. Its also possible to accept higher radial loading of the motor shaft due to a larger cross section giving extra strength.

    CHANGE OF DISPLACEMENT
    Change of motor displacement in the BD Series is achieved by changing the stroke of the crankshaft. This is achieved by a low pressure external pilot signal and changes from high to low displacement and vice versa can take place both dynamically, with a smooth speed variation, and statically.

    FREEWHEELING
    The BD Series motors can be freewheeled in full cavitation.

    DESIGN & OPERATION


    The sliding bearing has an extremely low coefficient of friction and as a consequence gives very high starting torque efficiency, and continues to achieve higher then average mechanical efficiencies both in high and low displacement modes. At present, the maximum running speed is restricted to the flow which can pass through distributor which is fitted to this series of motors.

    STARTING & LOW SPEED TORQUE


    The motors are capable of working at low speeds with a high degree of speed stability. The minimum stable speed depends on the displacement of the motor. Output torque remains very constant and does not fall away at very low speeds or under stall or start conditions.
    Prototypes still under testing, subject to development. Values can be changed.

    BD1 Series Motor


    DIMENSIONAL DRAWING

    Dimensions in inches [mm]

    TABLE OF AVAILABLE DISPLACEMENTS & PERFORMANCES DATA

    BD1
    D i splacement Bore Stroke Speci fi c T orque Pressure rati ng Peak pressure C ont. speed Max. speed Peak power i n /rev mm mm lb.ft/100 psi p si p si rpm rpm hp
    3

    100 6.04 28 32 7.83 4500 6000 500 1500 75

    25 1.53 8 1.98

    175 10.50 37 32 13.63 4000 5500

    45 2.75 8 3.41

    250 14.83 44 32 19.28 3500 5500

    60 3.66 8 4.83

    1500 3500 55

    500 1000 75

    1500 3000 75

    500 850 75

    1500 2500 75

    PERFORMANCES RANGE
    Torque (ft/lb) 1180 1030 890 740 590 440 300 150

    BD1
    BD1 - 25 BD 1 - 45 BD 1 - 60 BD 1 - 100 BD 1 - 175 BD 1 - 250

    rpm 0
    0 500 1000 1500 2000 2500 3000 3500 4000

    BD2 Series Motor


    DIMENSIONAL DRAWING

    Dimensions in inches [mm]

    PERFORMANCES RANGE
    Torque (ft/lb) 1800 1330 1600 1180 1400 1030 1200 890 1000 740 800 590 600 440 400 300 200 150 0 0 0 Torque (ft/lb) 1850 2500 500 1000 1500 2000 2500 rpm 3000 BD 2 - 65 BD 2 - 90 BD 2 - 125 BD 2 - 250

    OUTPUT SHAFT OPTIONS AVAILABLE

    BD2 - 250

    BD2 - 350
    BD 2 - 90

    Torque (ft/lb) 3000 2200


    BD 2 - 120 BD 2 - 175 1850 2500

    BD2 - 500
    BD 2 - 125 BD 2 - 175 BD 2 - 250 BD 2 - 500

    2000 1500

    2000 1500
    1100 1500

    1100 1500

    BD 2 - 350

    1000 740 740 1000 500 370 0 0 0 500 1000 1500 2000 rpm 2500 370 500 0 0

    rpm 0 500 1000 1500 2000 2500

    BD2 Series Motor


    TABLES OF AVAILABLE DISPLACEMENTS & PERFORMANCES DATA

    B D 2 250
    D i splacement Bore Stroke Speci fi c T orque Pressure rati ng Peak pressure C ont. speed Max. speed Peak power i n3/rev mm mm lb.ft/100 psi p si p si rpm rpm hp

    250
    15.32

    125
    7.69

    250
    15.33 40

    90
    5.37

    250
    15.33

    65
    3.84

    40 19.93 3500 6000 700 1000 95

    20 10.02

    40 20.32 3500 6000

    14 6.97

    40 20.32 3500 6000

    10 4.98

    1500 1800 80

    700 1000 95

    1500 2000 80

    700 1000 95

    1500 2400 80

    B D 2 350
    D i splacement Bore Stroke Speci fi c T orque Pressure rati ng Peak pressure C ont. speed Max. speed Peak power i n3/rev mm mm lb.ft/100 psi p si p si rpm rpm hp

    350
    21.47

    175
    10.56

    350
    21.47 47

    125
    7.38

    350
    21.47

    90
    5.31

    40 27.57 3500 5500 700 1000 100

    20 13.73

    40 28.09 3500 5500

    14 9.61

    40 28.09 3500 5500

    10 6.92

    1500 1800 90

    700 1000 100

    1500 2000 90

    700 1000 100

    1500 2200 90

    B D 2 500
    D i splacement Bore Stroke Speci fi c T orque Pressure rati ng Peak pressure C ont. speed Max. speed Peak power i n3/rev mm mm lb.ft/100 psi p si p si rpm rpm hp

    500
    30.08

    250
    15.07

    500
    30.67 56

    175
    10.56

    500
    30.67

    125
    7.38

    40 39.12 3500 5000 400 800 100

    20 19.58

    40 39.86 3500 5000

    14 13.73

    40 39.86 3500 5000

    10 9.77

    800 1600 90

    400 800 100

    1100 2000 90

    400 800 100

    1500 2200 90 5

    BD Series Motor

    ORDER CODES
    MOTOR CODE BD1, BD2

    BD

    1. Nominal displacement - See motor displ. table 2. Shaft options: 9 = 6= 2= 8= 3. Bearings: Int. 40-3-12 DIN 5480 Int. 40-3-12 DIN 5482 Tapered Keyed Parallel Keyed

    H = Roller Bearings GP = Spherical Roller Bearings on motor cover

    4. Other options: U = Without shaft seal SV = Shaft seal protection stainless steel sleeve corr. V = Viton seals I = Case press. relief valve A = High pressure shaft seal (73 psi cont., 218 psi peak) 5. Distributor: D40 = 1 port BSPP D47 = 1 SAE 3000 psi

    6. Tachometer: K = Prepared for tachometer J = with tachometer coupling 7. Direction of shaft rotation: R = Clockwise rotation L = Counter-Clockwise rotation 8. Distributor cover position: No code = Position DM1 J = With tachometer coupling

    GD4 Series Motor


    GENERAL CHARACTERISTICS & FEATURES
    Nine cylinder crankshaft design radial piston hydraulic motor The GD Series motors utilizes many of the proven components from the GM Series constant displacement motors for greater performance and reliability. The innovative design guarantees a smooth output torque and the variable shaft eccentric is based on a simple reliable mechanism.

    DESIGN & OPERATION OF THE TWO SPEED SYSTEM


    Dual displacement is achieved by a variation of the shaft eccentric cam. The displacement control system is based on a hydraulic device, which actuates a hydraulic control valve mechanism to select minimum or maximum displacement. The dual displacement mode allows the motor to reduce the displacement down to the 10% of the maximum, hence making the speed ten times higher.

    DIMENSIONAL DRAWING

    Shift pressure: max.

    350-400 psi 600 psi

    PERFORMANCES RANGE
    4422 62 cu. in.; 5075 psi 3685 Torque (ft/lb) 2950 2211 1474 737 0 21.35 cu. in.; 5075 psi
    4422 3685 2950 2211 1474 737 0 Torque (ft/lb)

    TORQUE

    MAX. DISPL. MIN. DISPL.

    Pressure (psi)

    200

    400

    rpm

    600

    800

    1000

    1200

    GD4 Series Motor


    TABLE OF AVAILABLE DISPLACEMENTS
    These are the obtainable displacements by varying the eccentric stroke. The prototypes are under development and other combinations can be possible.

    44mm
    D i spl. mi n. i n3/rev 11.78 D i spl. max. i n3/rev 33.56

    56mm
    D i spl. mi n. i n3/rev 19.02 D i spl. max. i n3/rev 54.42

    60mm
    D i spl. mi n. i n3/rev 21.84 D i spl. max. i n3/rev 62.45

    ratio
    mi n./max. 35%

    These di splacements are i n normal producti on and can be avai lable i n standard deli very ti me.

    44mm
    D i spl. mi n. i n3/rev 2.52 6.69 6.69 10.92 10.92 10.92 15.09 15.09 15.09 15.09 19.33 19.33 19.33 19.33 19.33 D i spl. max. i n3/rev 23.50 23.50 28.53 23.50 28.53 32.76 23.50 28.53 32.76 36.93 23.50 28.53 32.76 36.93 41.17

    56mm
    D i spl. mi n. i n3/rev 4.11 10.86 10.86 17.67 17.67 17.67 24.48 24.48 24.48 24.48 31.29 31.29 31.29 31.29 31.29 D i spl. max. i n3/rev 38.10 38.10 46.26 38.10 46.26 53.07 38.10 46.26 53.07 59.82 38.10 46.26 53.07 59.82 66.63

    60mm
    D i spl. mi n. i n3/rev 4.66 12.52 12.52 20.31 20.31 20.31 28.10 28.10 28.10 28.10 35.89 35.89 35.89 35.89 35.89 D i spl. max. i n3/rev 43.74 43.74 53.07 43.74 53.07 60.86 43.74 53.07 60.86 68.71 43.74 53.07 60.86 68.71 76.50

    ratio
    mi n./max. 11% 29% 24% 46% 38% 33% 64% 53% 46% 41% 82% 68% 59% 52% 47%

    Principle: hydraulic adjustment of eccentric cam. Adjustment range 1:2 - 1:10

    e: eccentricity A, B: internal pistons By adjusting the heights of the two internal pistons (A,B), it is possible to adjust the max. and min. eccentricity, hence the max. and min. displacement. 8

    WORLDWIDE

    SAI Hydraulics, Inc. 3905 W. 9th Street Trainer, PA 19061 (610) 497-0190 Fax (610) 497-0194

    SAI Hydraulics Canada Ltd. 6105 Boulevard Couture St. Leonard, PQ H 1P3G7 (514) 323-4552 Fax (514) 323-8780

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