CbN Series 2000/3000 Speed Reducer - Browning - (Version JPG) - Page n° 9 - PDF Catalogue | Technical Documentation

See other catalogues for Browning

Bevel gear reducer, V belt, Rack and pinion, Transmission belt, Gear-motor

Text version of the page

CbN

SERI ES

2000 3000

Speed Reducers

Selection

Size Selection (cont.) Step^ 4

• Verify overhung load ratings where required (see page 237).

Selection Information

1. Input HP

• Based on application data.

2. Speed/Ratio

• Obtain either desired output speed (RPM) or gearbox ratio based on application.

3. Service Factor

• Determine the required service factor using either the AGMA application classification chart (pages 238-240), or the duration of operation, load type, and drive type with the table below:

Example

Application Data

Rotary lobe pump, 10+ hours per day, speed reducer direct coupled to load, foot mounted, 1.25 service factor.

TEFC, 230/460 volt, 7 1/2 HP, 1750 RPM, 213TC frame footless.


PRIME MOVER	HOURS OF OPERATION	UNIFORM LOAD U	MODERATE SHOCK LOAD M	HEAVY SHOCK LOAD V
Electric Motor	0 - 3	0.80	1.00	1.50
	3 - 10	1.00	1.25	1.75
	10 - 24	1.25	1.50	2.00
Internal Combustion Engine	0-3	1.00	1.25	1.75
	3-10	1.25	1.50	2.00
	10 - 24	1.50	1.75	2.25

Motor rating:

Output speed: 280 RPM

Size Selection

280 RPM required output


	Equals 6.3:1 ratio	6.1 3242
	PM •SF = P	Example 10.45 2208
	7.5 HP x 1.25 = 9.4 HP	Example 10.45 2208

SIZE SELECTION

Step 1

• Locate speed reducer selection tables (pages 246263) based on input speed to gearbox.

Step 2

• Choose the nominal ratio appropriate for the speeds required.

Step 3

• Select the gear unit size for the chosen ratio and the known input speed so that the mechanical power rating P (hp) satisfies the following:

3242 (10.45 HP) > 9.4

pg.246

Select CbN 3242

(There are no thermal or OHL considerations.)

3. Catalog Designation

(see "ordering" page 236)

CbN • 3242 • S • B3 • 6.3 • U • 213TC

P > P • SF

4. Motor Model Number

Refer to motor catalog for complete motor selection, dimensions and characteristics.

P = mechanical power rating (hp) of gearbox

P_m = motor power (hp)

SF = required service factor

Note: Size selection based on absorbed power (Pa) or absorbed torque (Ta) at the low speed shaft instead of motor power (Pm) is allowed when the former is known with sufficient accuracy and if the number of start operations is limited. When Ta is applied in size selection, verify if:

T>T • SF

T T

torque rating (in. lbs.) at low speed shaft absorbed torque (in. lbs.) at low speed shaft (based on input hp) required service factor

235

CbN Series 2000/3000 Speed Reducer - Browning - #9

Bevel gear reducer, V belt, Rack and pinion, Transmission belt, Gear-motor