Primary reducer, rake
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Bridge-Mounted Dual Concentric Output Shaft Drive Units

Description
  • Drive unit has two concentric output drive shafts
  • Used on solids contact and flocculating clarifiers or softeners
  • Rake drive section is a low-speed, high-torque, totally enclosed gear drive with
    positive overload protection
  • Turbine drive section is a heavy-duty, higher speed, totally enclosed gear drive
  • The drive unit is supported by a bridge completely spanning the tank
  • The drive unit has a central output shaft to drive the rakes
  • Used in industrial, municipal and mining clarifiers and thickeners
  • Typically used on tank sizes from 10 to 100 ft (3 to 30 m) in diameter
    Features
    • Forged alloy steel main gears and pinions designed for 20 years of life calculated per
      AGMA 2001-D04
    • Precision, four-point-contact main bearing, with a 10-year warranty
    • Rake drive has accurate torque gauge calibrated in ft-lbf, N-m or any units desired
    • Variable speed turbine drive is standard
    • Alarm and cutoff switches and maximum torque limiting via shear pin or pressure relief valve
    • Dry well lubrication on turbine output
    • Designed for minimum maintenance with permanently lubricated rake intermediate gearbox

    RAKE TORQUE CAPACITY - BRIDGE-MOUNTED DUAL DRIVE UNITS
    TURBINE DRIVE POWER1
        Model
    Continuous
    Maximum Overload
    Yield
    Allowable Horsepower Max. Speed rpm
        
    ft-lbf
    N-m
    ft-lbf
    N-m
    ft-lbf
    N-m
    SX-A*-D25
    3,000
    4,100
    6,000
    8,200
    8,100
    11,000
    10
    56
    SX-B*-D25
    6,000
    8,200
    12,000
    16,400
    16,200
    22,000
    10
    56
    SX-C*-D25
    10,000
    14,000
    20,000
    28,000
    27,000
    36,500
    10
    56
    S25-A*-D25
    14,000
    19,000
    28,000
    38,000
    54,000
    73,000
    20
    56
    S34-A*-D34
    18,500
    25,000
    37,000
    50,000
    120,000
    163,000
    25
    39
    S34-B*-D34
    27,000
    36,500
    54,000
    73,000
    120,000
    163,000
    25
    39
    S44-B*-D44
    35,000
    47,500
    70,000
    95,000
    195,000
    264,000
    50
    29
    S44-C*-D44
    51,000
    69,000
    102,000
    138,000
    195,000
    264,000
    50
    29
    S60-C*-D60
    65,000
    88,000
    130,000
    176,000
    440,000
    597,000
    75
    21
    S60-D*-D60
    125,000
    169,500
    250,000
    339,000
    440,000
    597,000
    75
    21
    S44-B*2-D44
    70,000
    95,000
    140,000
    190,000
    390,000
    528,000
    50
    29
    S44-C*2-D44
    102,000
    138,000
    204,000
    276,000
    390,000
    528,000
    50
    29
    S60-C*2-D60
    130,000
    176,000
    260,000
    352,000
    880,000
    1,194,000
    75
    21
    S60-D*2-D60
    250,000
    339,000
    500,000
    678,000
    880,000
    1,194,000
    75
    21
    1 For higher horsepower requirements or higher speed, consult factory.
    Replace the * with the primary reducer option selected.
    Continuous: Torque at which main gear will have a life in excess of 20 years at normal operating speeds.
    Maximum Overload: The maximum safe, short term operating torque.
    Yield: The structural maximum torque based on the minimum yield strength of the main gear.



    SX-D25 Series Dimensions

    Item
    Description
    1
    Machine Frame
    2
    Main Gearbearing
    3
    Pinion - Turbine
    4
    Speed Reducer - Turbine
    5
    Output Flange - Turbine
    6
    Planetary Gearbox - Rake
    7
    Primary Speed Reducer - Rake
    8
    Torque Gauge Box - Rake
    9
    Output Flange - Rake


        Model
    A
    Rake Output Flange1
    Turbine Output Flange1
    Weight
        
    in    
    mm    


    lb    
    kg    
        SX-A*-D25
    7.9    
    201    
    4"
    10"
    2,000    
    910    
        SX-B*-D25
    7.9    
    201    
    4"
    10"
    2,200    
    1,000    
        SX-C*-D25
    10.3    
    262    
    4" with oversized 15/16" dia holes
    10"
    2,500    
    1,140    
        1 Metric flanges are available.
        Replace the * with the primary reducer option selected.

    SD Series Dimensions

    Item
    Description
    1
    Main Gear Housing - Rake
    2
    Main Gear Housing - Turbine
    3
    Main Gearbearing - Rake
    4
    Main Gearbearing - Turbine
    5
    Pinion - Rake
    6
    Planetary Gearbox - Rake
    7
    Primary Speed Reducer - Rake
    8
    Torque Gauge Box - Rake
    9
    Output Flange - Rake
    10
    Oil Drain - Rake
    11
    Pinion - Turbine
    12
    Turbine Drive Bearing Adapter
    13
    Helical Gearbox - Turbine
    14
    Output Flange - Turbine
    15
    Oil Drain - Turbine


        Model
    A
    B
    C
    D
    E
    Rake Flange1
    Turbine Flange1
    Weight
        
    in 
    mm 
    in 
    mm 
    in 
    mm 
    in  mm  in mm 


    lb 
    kg 
    S25-A*-D
    36 
    914 
    40 
    1,016 
    16.8 
    425 
    102 
    203 
    5"
    10"
    2,500 
    1,140 
    S34-A*-D
    42.5 
    1,080 
    46.5 
    1,181 
    18.1 
    461 
    152 
    10 
    254 
    8"
    16"
    3,900 
    1,770 
    S34-B*-D
    42.5 
    1,080 
    46.5 
    1,181 
    19.4 
    492 
    152 
    10 
    254 
    8"
    16"
    5,000 
    2,270 
    S44-B*-D
    54 
    1,372 
    58 
    1,473 
    19.2 
    488 
    152 
    10 
    254 
    10"
    20"
    5,800 
    2,630 
    S44-C*-D
    54 
    1,372 
    58 
    1,473 
    21.2 
    538 
    152 
    10 
    254 
    10"
    20"
    6,900 
    3,130 
    S60-C*-D
    68 
    1,727 
    73 
    1,854 
    22.5 
    572 
    203 
    14 
    356 
    16"
    30"
    11,200 
    5,080 
    S60-D*-D
    68 
    1,727 
    73 
    1,854 
    20.1 
    511 
    203 
    14 
    356 
    16"
    30"
    14,000 
    6,360 
        1 Metric flanges are available.
        Replace the * with the primary reducer option selected.


    Rake Primary Speed Reducer Options



    E-type primary speed reducer

    The E-type design uses helical gears for speed reduction. It has alarm and cutoff switches and a shear pin to provide triple protection of the drive unit. This design is used where the output speed is outside the limits of the F-type primary speed reducers or when an electro-mechanical type drive unit is desired.

    More Information

    F-type primary speed reducer

    The F-type design uses a hydraulic pump-motor combination for speed reduction. It has alarm and cutoff switches and hydraulic relief (equivalent to a shear pin in the E-type primary speed reducer) to provide triple protection of the drive unit. This design is positive torque-limiting and will operate under stalled and semi-stalled conditions. Optional reversing rotation and variable speed are available. The torque indication and protection system is equally accurate for operation in either direction.

    More Information

    H-type primary speed reducer

    The H-type design has all the features of the F-type primary speed reducer. It uses a stand-alone industrial hydraulic power unit. This design is used on higher horsepower and multiple pinion drive applications.

    More Information

    W-type primary speed reducer

    The W-type design uses helical gears for speed reduction. It has shear pin and shear pin activated cutoff switch to protect the drive unit. This is simplified E-type design used where a torque gauge and adjustable alarm switch are not required.

    More Information

    Turbine Variable Speed Primary Reducer Options

    Mechanical type variable speed reducer

    The mechanical variable speed reducer is a ring-cone or a disc design. The output speed varies as the pitch-line distance between two rotating components decreases or increases. The speed variation is adjusted by turning a hand-wheel on the reducer. These reducers include a standard NEMA C-frame on both the input and output connections for easy installation and removal. The reducers provide a 5:1 variable speed range.

    Electrical type variable speed reducer

    The electrical type variable speed is a variable frequency drive (VFD) that controls the output speed of the electric motor. The VFD can be mounted near the drive unit or at a remote location. VFDs provide a clean, maintenance-free, and economical way of attaining variable speed. Standard features include forward and reverse, speed indication, motor overload protection, soft-start, 4-20 mA signal, and monitoring of operating conditions. These reducers provide a 5:1 variable speed range or 10:1 when used with an inverter duty motor.

    Hydraulic type variable speed reducer

    The hydraulic type variable speed reducer is a stand-alone industrial hydraulic power unit with a variable volume piston pump and hydraulic motor combination for speed reduction. This design is used when the rake primary speed reducer is an H-type design. A screw located on the pump is turned to change the stroke of the pump pistons and vary the amount of oil delivered to the hydraulic motor, thus varying the final output speed of the drive unit. These speed reducers provide a 3:1 variable speed range.

    Ordering Information

    Bridge-Mounted Solid Contact Drive Model Number Turbine Specification Extension
    Series
      Rake Gear
      Pitch Dia.
      (Inches)

     - 
      Secondary
      Speed
      Reducer
      Primary
      Speed
      Reducer
      Number
      of Pinions

     - 
      Turbine1   Turbine Gear Pitch Dia. (Inches)   Maximum
      Turbine HP

    S

    X for no final
    gear-bearing


    A

    E
    F

    (N/A)


    D

    20
    25

    5
    B
    10
    C
    10
    25
    A

    E
    F
    H

    1 (omit)
    2
    25
    10
    34
    A
    34
    25
    B
    44
    50
    44
    B
    1 (omit)
    2
    3
    4
    44
    50
    C
    60
    75
    60
    C
    60
    75
    D
    60
    75
    1 For solid contact drive units with lifts, consult factory.

    Example: Model S34-AF-D345

    S is for a bridge-mounted drive unit; 34 is the size of the final gear pitch diameter in inches; A is the size of the secondary speed reducer; F is the type of the primary reducer; D is for a turbine drive; 34 is the size of the turbine gear pitch diameter in inches; 5 is the turbine horsepower.

    Standard Features

    Alarm and cutoff switches
    O&M manual in PDF format
    6" torque gauge indicating real torque
    (not available on H-type primary reducer)

    Optional Features

    4-20 mA torque transducer
    Bi-directional operation (available for F and H-type primary reducers)
    Loss motion switch
    4-20 mA lift position transducer
    Variable speed, turbine
    Variable speed, rake
    Special electric motor
    Oil heater (available for F and H-type primary reducers and main gear housing)
    Oil temperature switch
    Oil level switch
    Explosion proof switches