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Bridge-Mounted Drive Units

Description
  • A low-speed, high-torque, totally enclosed gear drive with positive overload protection
  • 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 gear and pinion designed for 20 years of life calculated per AGMA 2001-D04
  • Precision, four-point-contact main bearing, with a 10-year warranty
  • Accurate torque gauge calibrated in ft-lbf, N-m or any units desired
  • Alarm and cutoff switches and maximum torque limiting via shear pin or pressure relief valve
  • No lower pinion bearing, eliminating a common source of drive failure
  • Designed for minimum maintenance with permanently lubricated intermediate reducer

TORQUE CAPACITY - BRIDGE-MOUNTED DRIVE UNITS
    Model
Continuous
Maximum Overload
Yield
    
ft-lbf     
N-m    
ft-lbf    
N-m    
ft-lbf    
N-m    
    SX-A*
3,000    
4,100    
6,000    
8,200    
8,100    
11,000    
    SX-B*
6,000    
8,200    
12,000    
16,400    
16,200    
22,000    
    SX-C*
10,000    
14,000    
20,000    
28,000    
27,000    
36,500    
    S25-A*
14,000    
19,000    
28,000    
38,000    
54,000    
73,000    
    S34-A*
18,500    
25,000    
37,000    
50,000    
120,000    
163,000    
    S34-B*
27,000    
36,500    
54,000    
73,000    
120,000    
163,000    
    S44-B*
35,000    
47,500    
70,000    
95,000    
195,000    
264,000    
    S44-C*
51,000    
69,000    
102,000    
138,000    
195,000    
264,000    
    S60-C*
65,000    
88,000    
130,000    
176,000    
440,000    
597,000    
    S60-D*
125,000    
169,500    
250,000    
339,000    
440,000    
597,000    
    S80-D*
140,000    
190,000    
280,000    
380,000    
750,000    
1,017,000    
    S80-E*
250,000    
339,000    
500,000    
678,000    
750,000    
1,017,000    
    S44-B*2
70,000    
95,000    
140,000    
190,000    
390,000    
528,000    
    S44-C*2
102,000    
138,000    
204,000    
276,000    
390,000    
528,000    
    S60-C*2
130,000    
176,000    
260,000    
352,000    
880,000    
1,194,000    
    S60-D*2
250,000    
339,000    
500,000    
678,000    
880,000    
1,194,000    
    S80-D*2
280,000    
380,000    
560,000    
760,000    
1,500,000    
2,034,000    
    S80-E*2
500,000    
678,000    
1,000,000    
1,356,000    
1,500,000    
2,034,000    
    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-Series Dimensions
Item
Description
1
Machine Frame
2
Planetary Gearbox
3
Torque Gauge Assembly
4
Primary Speed Reducer
5
Output Flange


    Model
A
B
C
Output Flange1
Weight
    
in    
mm    
in    
mm    
in    
mm    
    
lb    
kg    
    SX-A*
36    
914    
24    
610    
5.2    
132    
4"    
700    
318    
    SX-B*
36    
914    
24    
610    
7    
178    
6"    
900    
410    
    SX-C*
36    
914    
24    
610    
8.6    
218    
6"    
1,200    
545    
    1 Metric flanges are available.
    Replace the * with the primary reducer option selected.

S-Series Dimensions

Item
Description
1
Machine frame
2
Main Gearbearing
3
Pinion
4
Planetary Gearbox
5
Primary Speed Reducer
6
Torque Gauge Assembly
7
Output Flange
8
Drain Plug


    Model
A
B
C
D
Output Flange1
Weight
    
in    
mm    
in    
mm    
in    
mm    
in     mm    
    
lb    
kg    
S25-A*
32    
813    
36    
914    
7.4    
188    
8    
203    
6"
1,340    
610    
S34-A*
39.5    
1003    
43.5    
1,105    
8.1    
207    
8    
203    
8"
1,940    
880    
S34-B*
42.5    
1,080    
46.5    
1,180    
9.4    
239    
8    
203    
8"
2,340    
1,060    
S44-B*
50    
1,270    
55    
1,397    
9.3    
236    
10    
254    
10"
2,920    
1,330    
S44-C*
54    
1,372    
59    
1,499    
11.3    
287    
10    
254    
10"
3,500    
1,590    
S60-C*
66    
1,676    
70    
1,778    
11.5    
292    
12    
305    
18"
5,000    
2,270    
S60-D*
68    
1,727    
73    
1,854    
10.1    
258    
12    
305    
18"
5,600    
2,540    
S80-D*
96    
2,438    
104    
2,642    
13.5    
343    
14    
356    
24"
10,800    
4,910    
    1 Metric flanges are available.
    Replace the * with the primary reducer option selected.

Primary Reducer Option

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

Lift Mechanism Option

The lift mechanism provides the ability to raise and lower the rakes. The rake lift operates by raising the output shaft into the drive unit. Rake vertical displacement of up to 36 inches (900 mm) can be provided.

The lift mechanism is fully contained within the drive unit. In most cases, the installation of a DBS lift-equipped drive unit is no more complicated than that of a normal non-lifting clarifier drive.

The lift option is offered with manual or powered operation. The powered lift mechanism provides positive lift force control to prevent damage to the rakes or the screw jack.

The DBS powered lift design does not require the lift mechanism to rotate. There are no rotary electrical slip rings to maintain.

More Information


F-Type Lift Actuator:
A totally enclosed hydraulic speed reducer power the lift jack.
E-Type Lift Actuator:
The actuator utilizes a series of mechanical speed reducers to power the lift jack.
H-Hype Lift Actuator:
A hydraulic motor, powered by the rake primary reducer, operates the lift jack.

Ordering Information

Bridge-Mounted Drive Unit Model Number Lift Option Specification Extension
Series
  Rake Gear
  Pitch Dia.
  (Inches)

 - 
  Secondary
  Speed
  Reducer
  Primary
  Speed
  Reducer
  Number
  of
  Pinions

 - 
  Lift
  Option
  Lift
  Capacity
  (tons)
  Lift
  Travel
  (inches)
  Lift
  Actuator
  Option

S

X for no final
gear-bearing


A

E
F

(N/A)


L

5

12
24

M,E,F
B
C
(N/A)
(N/A)
(N/A)
(N/A)
25
A

E
F
H

1 (omit)
2
L
5
12
24
36
M
E
F
H
34
A
10
B
15
44
B
1 (omit)
2
3
4
15
C
20
60
C
25
D
35
80
D
Consult Factory
Consult Factory
Consult Factory
E

Example: Model S34-AF-L1012F

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; L is for a lift mechanism; 10 is the lift capacity in tons; 12 is the lift travel in inches; F is the type of the lift actuator.

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
Explosion proof switches
Special coating
Oil heater (available for F and H-type primary reducers and main gear housing)
Special electric motor
Oil temperature switch
Oil level switch