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Couplings are an essential part of power transmission. They are used to connect the two shafts. They are of three types – the full gear coupling, half gear couplings, and the brake drum couplings.

Full gear couplings
Construction consists of a pair of identically toothed hubs along with a pair of identical flanged sleeves. These have internal teeth and a set of bolts, nuts, lock washers, lube plugs, oil /grease retaining seals over the hubs and a gasket.

Some of the notable features include:

  • Less backlash and compact assembly
  • Large bore capacity
  • Up to 1200 C usage is possible
  • High power to weight ratio.
  • Angular, parallel and axial misalignments can be handled
  • With proper grade of grease, usage can be extended to high-temperature conditions.

Also, nomenclature of the gear is as follows :

  • Forged hubs with external teeth and forged sleeves with internal teeth
  • Flanged gasket
  • Lubricating plug
  • Close tolerance connecting bolts

Depending upon the load size, different varieties of drives are available. Depending on your need, we can get the best set of full gear couplings for you.

Half gear couplings
Construction is similar to that of full gears except for a single piece of the toothed hub and flanged sleeves. They also contain internal teeth and a set of bolts, nuts, lock washers, lube plugs, oil /grease retaining seals over the hubs and a gasket.
Features of half gear are similar to that of full gear with slight changes:

  • Used primarily with floating shaft assembly
  • Parallel misalignment cannot be accommodated
  • Widely used for cross traverse and along travel line shaft drives.

Selection procedure is based completely on the service factor table stated below. Multiply by the running power by the given service factor. We get the design power (rpm). Convert to power at 100 rpm. Use this for selecting the appropriate coupling.
Also refer to the rating table and read until power greater than or equal to design power at 100 rpm is found. The first column gives the appropriate coupling size. Go for higher size if required bore size is greater than the corresponding size of your previous selection.

Brake drum couplings
Some of the important features are:

  • Interchangeability along with high torque
  • Fastener design – better than before
  • Lubrication system with improvements
  • Higher misalignment capacity
  • A high bore capacity

Standard brake drums can take misalignments In both angular and parallel manner. They can also bear end float pressurizing the adjacent bolts with axial loads. The exposed design of bolt allows usage of either open end or socket wrenches making it a preferred design for industrial application of all sorts. These are the ideal choice for fans, overhead cranes, steel, cement, power plants, conveyors, and paper mill equipment.
 
  • FULL GEAR COUPLING
  • HALF GEAR COUPLING
  • BRAKE DRUM COUPLINGS

Features

  • Less Backlash.
  • Compact Assembly.
  • Larger Bore Capacities.
  • High Power to Weight Ratio.
  • Accommodates angular. parallel and Axial Misalignments.
  • Generally used upto 1200 C.
  • Can be used for higher temperatures by using proper grade of grease or oil.

Construction:-
   Full gear type Coupling consist of 2 identical toothed hubs, 2 identical flanged sleeves with internal teeth, a gasket, a set of bolts, nuts and lock washers, lube plugs and    oil/grease retaining seals over the hubs.

Nomenclature:-
•   Forged hubs with external teeth
   •   Forged sleeves with internal teeth
   •   Flanged gasket
   •   Close tolerance connecting bolts
   •   Lubrication plug


table

Diagram:-

table

Table:-

table

Features:-

  • It cannot accommodate parallel misalignment.
  • Uses primarily with floating shaft assemblies.
  • Extensively used for cross traverse and along travel line shaft drives.

Construction:-
Half gear type Coupling consist of toothed hubs, flanged sleeves with internal teeth, a gasket, a set of bolts, nuts and lock washers, lube plugs and oil/grease retaining seals over the hubs and rigid.

Selection Procedure:-

  1. Select an appropriate Service Factor from table given below.
  2. Multiply the rated running power by the service factor. This gives Design Power at rated speed(rpm). Convert this to design power at 100 rpm. This is used as a basis for coupling selection.
  3. Refer to the rating column and read until the power greater than or equal to the design power at 100 rpm is found. The size of the gear coupling is given in the corresponding first column. Check the max.bore capacities. If req. bore size is greater than the max.bore of selected coupling size, then go for higher size to meet the req.bore.

 

Diagram:-

Diagram

Table:-

Table

*All dimensions are in mm unless otherwise specified.

*Weights & M.I specified are with solid hubs.


FEATURES

  • High Torque Ratings
  • Large Bore Capacity
  • Interchangeability
  • Better Fastener Design
  • High Misalignment Capacity
  • Improved Lubrication System

Brake drum with Full gear coupling:-
Standard brake drum with full gear couplings accommodate both angular and parallel misalignment of combination of both, as well as end float with out imposing appreciable axial loads on adjacent bearings. The exposed bolt design allows use of the either open end or socket wrenches, which makes it the preferred design of most industrial applications. Ideal for all standard applications including fans, overhead cranes, conveyors, steel, cement, power plant, and paper mill equipments.

diagram table

*All dimensions are in mm unless otherwise specified.
*Weights & M.I specified are with solid hubs.


The housing can be made of nodular cast iron or of fabricated steel. Additional heating cartridges can be built into the housings. Special seals may be provided when the plant has to be set up in dusty or humid surrounding.

Before the gear unit is set up the operating instructions should be studied and followed. Inclined positions for installation are  Possible on request. The plant user should provide protection covers on rotating parts.

Allowable noise level is generally as mentioned below
(a) Gearbox with C.I. housing: 85 d B
(b) Gearbox with fabricated housing: 90 d B
(c) Gearbox with fan or built in pump will have 5 d B higher than (a) & (b)
   
 
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