7/29/2019 Coeficient of Multi Strand

1/3

4.1.2 Coefficients Used in Selection

Multiple strand factorIn multiple strand power transmission chains, the loading is unequal across thewidth of the chain, therefore, the transmission capability is not a direct multiple ofthe number of chains. You must use a "multiple strand factor," which is shown inTable 4.1, to determine the correct value.

1.

Service factor, KsThe chain transmission capability is reduced if there are frequent or severe loadfluctuations. You must apply the appropriate factor based on the type of machineor motors (Table 4.2).

2.

T a b l e 4 . 1 Multiple Strand Factor

Number of Roller Chain Strands Multiple Strand Factor

2 1.7

3 2.5

4 3.3

5 3.9

6 4.6

T a b l e 4 . 2 Service Factor

Type of

ImpactMachines

Source of Power

Electric

Motor or

Turbine

Internal Combustio n

Engine

With

Hydraulic

Drive

Without

Hydraulic

Drive

Smooth

Belt conveyors with small load fluctuation,

chain conveyors, centrifugal blowers, ordinary

textile machines, ordinary machines with small

load fluctuation.

1.0 1.0 1.2

Some

impact

Centrifugal compressors, marine engines,conveyors with some load fluctuation,

automatic furnaces, dryers, pulverizers,

general machine tools, compressors, general

work machines, general paper mills.

1.3 1.2 1.4

High

impact

Press, construction or mining machines,

vibration machines, oil-well rigs, rubber

mixers, rolls, general machines with reverse

or high-impact loads.

1.5 1.4 1.7

Chain speed coefficient, Kv; sprocket tooth coefficient, Kc3.

Previous Up Contents Next

Coefficients Used in Selection http://chain-guide.com/basics/4-1-2-coefficients-used-in-sele

2013/07/03

7/29/2019 Coeficient of Multi Strand

2/3

Adjust the transmission capability according to the chain speed and number ofteeth in the small sprocket (Figure 4.6). The sprocket coefficient is labeled Kc.

Impact coefficient, KThis coefficient (Figure 4.7) is based on the inertia ratio of the driving machine and

driven machine (ratio of I, ratio of GD2) and the amount of play in transmissionequipment. When the inertia ratio is less than 0.2 or greater than 10, use the value

of 0.2 or 10, respectively.

4.

Fi g u r e 4 . 6 Speed Factor (Kv) and Sprocket Factor (Kc)

Fi g u r e 4 . 7 Shock Factor (K)

T a b l e 4 . 3 UnbalancedLoad Factor (Ku)

Lift ing Strands Factor

2 0.6

4 0.36

Coefficients Used in Selection http://chain-guide.com/basics/4-1-2-coefficients-used-in-sele

2013/07/03

7/29/2019 Coeficient of Multi Strand

3/3

Unbalanced load coefficient; KuWhen you use two or four chains in a hanging application or shuttle traction setup,

the tension of each chain is not equal. This must be accounted for by using thecoefficient found in Table 4.3. The example assumes an unbalanced load ratiobetween two chains of 60/40 (percent) [i.e., 60 + 40 = 100 percent].

5.

Back to Top

The Complete Guide to ChainCopyright 1995-2006 by the Tsubakimoto Chain Co. All rights reserved.

Previous Up Contents Next

Coefficients Used in Selection http://chain-guide.com/basics/4-1-2-coefficients-used-in-sele

2013/07/03