Heavy Duty Worm Gear Series ER
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Serving an entire spectrum of mechanical drive applications from food, energy, mining and metal; to automotive, aerospace and marine propulsion, we are here to make a positive difference to the supply of drive solutions. Worm Gear units reduction types Parallel angle helical bevel helical geared motors & reducers Right angle helical bevel helical geared motors & reducers Screwjack worm gear unit Helical parallel shaft & bevel helical right angle drive gear In-line helical geared motors & reducers Worm gear unit Large helical parallel shaft & bevel helical right angle drive units Roloid Gear...

ER Series worm gear units are identical replacements for David Brown (Radicon) heavy duty worm gear units in all 1. Foundation hole dimensions and size of hole 2. Distance from bottom base to input centreline 3. Input/Output shaft dimensions Ratings are also comparable to David Brown (Radicon) worm gear units. Gear Case Gear case is of streamlined design, rugged in construction, made of close-grain cast iron. It is completely oil- tight, dust-proof and capable of being installed in the open without a separate cover. The faces and bores are accurately bored and machined on latest precision...

LOAD CLASSIFICATION BY APPLICATIONS M = Moderate shock load H = Heavy shock load Driven Machine brew kettles-continuous mash tubs-continuous scale hopper-frequent Clay working clay working machinery M Driven Machine cutter head drives H rotating, swing or slew f tracking, drive wheels f cooling towers light, small diameter U Food industry Laundry washers Line shafts driving processing other line shafts U Lumber industry Driven Machine planer feed chains M planer floor chains M planer tilting hoist M re-saw merry-go-round small waste small waste tipple hoist conveyor M tipple hoist drive M...

RATINGS & SERVICE FACTORS Explanation And Use Of Ratings And Service Factors. Gear unit selection is made by comparing actual loads with catalogue ratings. Catalogue ratings are based on a standard set of loading conditions whereas actual load conditions vary according to type of application. Service factors are therefore used to calculate an equivalent load to compare with catalogue ratings. Mechanical Ratings and Service Factor (FM) Mechanical ratings measure capacity in terms of life and/or strength assuming 12 hr/day continuous running under uniform load conditions. Catalogue ratings...

EXAMPLE SELECTIONS Worm reduction gear having input (worm) above the wheel required for belt conveyor where non-uniform material is fed on conveyor belt, operating for 8 hours per day. Speed required at conveyor shaft is 50 rpm. The gear unit is driven directly using coupling by 30 KW, 1500 rpm electric motor. Step : 1 Ratio required = Input Speed 1500 = Step : 2 From Table No 1. Drive m/c - Belt Conveyor Type of Load - Moderate Shock (M) Mechanical service factor (Fm) = 1.25 for 8 hr/day operation Step : 3 Input power = Motor Power x Fm From Catalogue - Rating at Input 1500 rpm, Ratio 30:1...

SERIES ER EXAMPLE SELECTIONS Step : 5 From catalogue, rating at input 1500 rpm ratio - 50:1, for 14” size Output torque (thermal) = 10486.9 Nm, which is less than calcuulated equivalent Output torque (thermal) = 11460 Nm 29064 Nm. Higher gear unit size 17 ER-U, ratio - 50:1 is to be slected where at input 1500rpm where, output torque (mechanical) = Input power (mechanical) = 110 Kw Required Input power = Calculated equivalent output torque (Mech.) x Rated power (Mech.) rated output torque (Mech.) x Fm 14818.96 x 110 = 37.39 Kw = 29064 x 1.5 Nearest standard motor having 37Kw at 1500 rpm an...

Ratings At Input Speed 1450 RPM

Ratings At Input Speed 960 RPM

Output Shaft Keyway Detail Output Shaft Keyway Detail Mounting Positions And Shaft Handing B - Breather Plug L - Oil Level Indicator D - Drain Plug G - Grease Nipple Replace G by plug for ER-V(X), V(Y) in bottom side.

_GEAR RATIO Actual Gear Ratio OVERHUNG LOADS : Whenever a sprocket, gear, sheave or pulley is mounted on the output shaft, a calculation should be made to determine the overhung load in Newtons on the shaft, using the formula: Where, P = equivalent overhung load in Newtons KW = power carried by shaft in Kilo Watts R = pitch radius of sprocket, pinion, sheave or pulley in meter Maximum Permissible Overhung Loads (Newtons) At Centre Of Wheel Shaft Extention At 1500 R.P.M. Input Speed. * Special Heat Treated Shaft is supplied TRB = Taper Roller Bearing CRB = Cylindrical Roller Bearing Overhung...

* First filling of oil is not supplied with the gear unit. * First change of oil should be made after 500 hrs. of operation. * Subsequent oil change must be made after every 3000 hrs. of operation.This interval should not exceed 12 months. Recomended Lubricants POLYGLYCOL BASED SYNTHETIC LUBRICANT Use of polyglycol based synthetic lubricant is also advisable to improve the transmitting capacity (rating) of gear units min. 20% as compared with use of mineral oil at same working temperature. This gear oil shows excellent non-ageing stability with favourable influence on efficiency. Aproved...

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