Speed Increasers Overview

Speed Increasers.

Cotta engine mounted speed increasers increase the engine speed to the driven equipment speed allowing both the engine and the load to operate at ideal speed and efficiency.

Cotta Speed Increasers are are designed for use with the commercial offerings of major engine manufacturers and are used extensively in applications where diesel engines replace electric motors.

Direct mount speed increasers are available with SAE flywheel housings from #5 to #00, ratios to 1:4, and horsepower capacity to 2000+.

Flywheel connection options include over center clutches, air clutches, drive plates, and torsional couplings. The gearboxes can also be used as independent mount by eliminating the bell housing and using a support bracket.

Many special purpose speed increasers are available. If our catalog offerings do not meet your needs, ask a Cotta Sales Engineer about modified standards or special designs.

See the tabulation of standard increasers below, or click here to open a complete speed increaser catalog in PDF format. For a quote click here Request a quote.

Note: the following table contains generalized information. many features such as clutch size and bell housing selection affect weight and installation dimensions. Ratios differ from engine to anti engine rotation. Click on an individual model to get more precise dimensions, ratios, and available options.

Speed Increaser Tabulation

MODEL TORQUE CAPACITY(LB-FT) MAX RATIO STD SAE HSG SIZE WT. (lbs) a b c d e f OUTPUT SHAFT DIA.
AO2053A
AO2053E
650
450
4 2 400 14.62 5.65 16.12 21.75 5.5 9.13 2.25
SI2A
SI2E
1450
1300
4 1 800 18.5 6.2 22.0 29.0 7.0 11.0 2.5
SI3A
SI3E
2000
1900
3.89 1 975 22.75 6.3 25.0 33.0 8.00 12.5 2.75
GO1700A
GO1700E
5500 2.46 0 1230 26.75 7.4 28.75 35.19 10.25 15.37 2.75
G01900A
GO1900E
7900 3 00 1530 24.5 7.15 38 42 13.5 19.0 3.25
Model AO2053AAO2053E
TORQUE CAPACITY(LB-FT) 650450
MAX RATIO 4
STD SAE HSG SIZE 2
WT. (lbs) 400
a 14.62
b 5.65
c 16.12
d 21.75
e 5.5
f 9.13
OUTPUT SHAFT DIA. 2.25
Model SI2ASI2E
TORQUE CAPACITY(LB-FT) 14501300
MAX RATIO 4
STD SAE HSG SIZE 1
WT. (lbs) 800
a 18.5
b 6.2
c 22.0
d 29.0
e 7.0
f 11.0
OUTPUT SHAFT DIA. 2.5
Model SI3ASI3E
TORQUE CAPACITY(LB-FT) 20001900
MAX RATIO 3.89
STD SAE HSG SIZE 1
WT. (lbs) 975
a 22.75
b 6.3
c 25.0
d 33.0
e 8.00
f 12.5
OUTPUT SHAFT DIA. 2.75
Model GO1700AGO1700E
TORQUE CAPACITY(LB-FT) 5500
MAX RATIO 2.46
STD SAE HSG SIZE 0
WT. (lbs) 1230
a 26.75
b 7.4
c 28.75
d 35.19
e 10.25
f 15.37
OUTPUT SHAFT DIA. 2.75
Model G01900AGO1900E
TORQUE CAPACITY(LB-FT) 7900
MAX RATIO 3
STD SAE HSG SIZE 00
WT. (lbs) 1530
a 24.5
b 7.15
c 38
d 42
e 13.5
f 19.0
OUTPUT SHAFT DIA. 3.25
  • All dimensions are in inches.
  • Bell housing are standard for the model shown. Chart dimension “A” is base upon that standard. Consult individual spec sheets for optional bell housing dimensions.
  • Standard output shaft location for speed reducers is 12 o’clock to the input (as shown).
  • Cotta speed reducers are designed to be driven clockwise facing the input shaft.
  • Refer to individual spec sheets for speed limitations.
  • Speed reducers require rear supports.

Note: in order to specify a speed reducer we will need the following information:

  • Input speed
  • ideal output speed
  • flywheel housing size
  • flywheel connection requirement (clutch, drive plate, torsional coupling, etc.)
  • direction of rotation (engine or anti engine)
  • type of driven equipment