Heavy Duty Wormgear Superior Gear Technology

TW Series - Product Features Wide range of gear unit type single and double reduction options for complete design flexibility. Unique Holroyd tooth form for maximum torque capacity and optimum efficiency. Phosphor bronze wormwheel rim electron beam welded onto cast iron centre on unit sizes up to 14 to ensure maximum strength under shock load conditions. Sprag clutch backstop option to prevent drive reversals. Heavy duty taper roller bearings fitted for maximum load capacity and long life. Two piece close grained cast iron gear case for strngth and absorption of vibration for quiet running. Enhanced...

Contents Page No ‘TW’ Series Unit Features 2 ATEX Approval Details 4 General Specification 5 Selection of TW Series Units 6-7 Load Classification by Application 8 Overhung and Thrust Load Capacities 9 - 10 Exact Ratios 11 Selection Data - Single Reduction Units 12 - 25 Selection Data - Double Reduction Units 26 - 27 Dimensions - Single Reduction Units 28 - 32 Dimensions - Double Reduction Units 33 - 37 Dimensions - Motorised Units 38 Dimensions - Torque Arm 39 Installation, Maintenance and Storage 40 Lubrication 41 Oil Capacities 28 - 37 Weights 28 - 37 www.renold.com 3

ATEX Approval Details ATEX Approval RENOLD Gears products for operating in potentially explosive 9 RENOLDGears units are classified as ATEX Group II Category 2 equipment, which embodies sufficient safeguards to be suitable for use in potentially explosive atmospheres for normal operation and for operation during an expected malfunction. 9 It is essential that there is sufficient lubricant to prevent the gears and bearings running 'dry'. Gear units should be inspected daily for signs of oil leakage, overheating or noisy 9 Gear units should be cleaned at regular intervals depending on the operating...

TW Series - General Specification Bearings The range of TW Series heavy duty units is the result of continuing research and development, and enables significant increases in the power transmission and overhung load capabilities of each unit to be achieved. Standard metric taper roller bearings are fitted throughout in the 10”, 12” and 14” units, with a face to face arrangement on both the worm and the wheeline to impart the maximum possible stiffness. A similar arrangement is used on the wheeline of the larger sized gear boxes, but on the wormline, a matched set of taper roller bearings is installed...

TW Series - Selection Information To select a worm gear unit the following basic information must be known and, if we are to make the selection, should be submitted in full to our Technical Sales Department. Power a) Prime mover, type and output power (kW). b) Gear unit input and output power required (kW). c) For input speeds below 250 rev/min consult our Technical Sales Department giving details of required output torque (Nm) and diameter of driven shaft (mm). Speed Gear unit input and output rev/min. Duty a) The characteristics of the drive eg. degree of impulsiveness of the driven load. b)...

TW - Series - Selection Examples Mechanical Selection Torque Thermal Selection Torque Mechanical Selection Power Thermal Selection Power Nm = Nm = (kW) = (kW) = Actual Torque (Nm) Requirement Actual Torque (Nm) Requirement Actual Power (kW) Requirement Actual Power (kW) Requirement It can be seen from the ratings tables on pages 12 - 27 that both mineral and synthetic oil ratings are included. Depending upon which type of oil is to be used inside the gear unit will determine which ratings are used to make a selection. Example 1 X X X X Mechanical Service (fD) Factor Thermal Service (fT) Factor...

^ TW Series - Load Classification by Application ^ Brew kettles-continuous duty S Mash tubs-continuous duty S Scale hopper-frequent starts M Clay working machinery Clay working machinery M Reciprocating - single cylinder H Conveyors - uniformly loaded or fed Conveyors - heavy duty Live roll * Crane Drives - not dry dock Bridge travel * Trolley travel * Cable reels Cutter head drives Manoeuvring winches Screen drive Utility winches Main hoist Auxiliary hoist Boom, luffing Rotating, swing or slew Tracking, drive wheels Bucket - uniform load Bucket - heavy load Bucket - continuous Centrifugal discharge...

TW Series - Overhung and Thrust Loads The overhung load may be calculated by the following formula: Output shafts of worm gear units are frequently fitted with a spur pinion, chain pinion or belt pulley causing an overhung load to be imposed on the output shaft and bearings. These loads can generally be sustained by the gear unit; however, if the load is greater than the maximum allowable load for the unit, it maybe necessary either to select a larger unit or to lessen the effect of the load on the shaft bearings. This can be done in two ways. The pinion can be mounted on a shaft in its own bearings...

TW Series - Installation, Maintenance and Storage Initial Running Changing Oil All worm gear units are supplied without oil and should be filled to correct level with suitable lubricant before running. The oil should be changed completely at intervals depending upon the working conditions. First Filling Storage Single Reduction Units When installed and before running, the unit should be filled with new lubricant to the correct level as follows. With the gear stationary, remove the filler and breather plug and oil level plug. Fill until the lubricant level is visable at the indicator (if fitted)...

TW Series - Lubrication Information Technical Department. The correct fill of oil for the unit size and mounting position can be found in either the appropriate catalogue or the Installation and Maintenance Guide. Only good quality oils should be used, such as those listed below, as the use of inferior or unsuitable products may cause rapid wear and possible damage to the gearbox. Some EP additives such as Sulphur can attack Bronze especially at operating temperatures above 80˚C and therefore should be avoided. Which Oil to Select There are three main oils Mineral, Synthetic (Polyalphaolefin)...