Clutches & Gearboxes RM Speed Increasing Gearboxes 13 The formula shown in the illustration will enable the radial loading to be calculated. The figure should be compared with the maximum allowable radial loads shown against distance (x) in the chart. Oil capacity will vary slightly according to ratio and wil increase if RM unit is fitted with cooling system. Some special ratios are available upon request. For heavy duty applications types RM 120 and RM 150 gearboxes are prepared to accept an oil circulation pump which permits the use of a heat exchanger to keep the oil temperature at an acceptable level. Use SAE 90 lubricant in these speed reduction and multiplier gearboxes. F = 1910 x kW x f x f 1 n x D F = side load (daN) kW = Input power (kW) n = output shaft speed (rpm) D = pitch diameter of pulley (m) f = load factor 1.0 for chain or gear drive 2.5 for V belts 3.5forlatbelts f 1 = 2 only for reciprocating compressor or severe shock drives. The resulting F value is to be lower or equal to that quoted on the table, according to the distance X.
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