Fenner Resilient Coupling

Fenner Resilient Couplings give you a combination of advantages of high power rating of a gear coupling and flexibility of elastomer coupling. They are easy to install and simple to maintain. The flexible grids are quickly replaceable without disturbing the connected equipment.

Fenner Resilient Couplings are available in broad range of sizes covering from 0.45 kW to 1307 kW per 100 rpm and bores upto 267mm.

FEATURES:

All metal construction having no fast wearing out components.
Accurately machined. Dynamic balancing is normally not required.
Torsionally flexible. Progressive torsional flexibility (due to curved profile) provides protection against shock load, impact load and vibration.
Heat treated spring steel grid absorbs high impact shocks without loss of energy.
Transmits full torque with dampened vibration and reduce peak loads.
When over load occurs. grid fails and prevents failure of the Shaft or machinery part connected to the coupling.
When parallel misalignment is too severe, the related machine is protected by the virtue of shearing of Grid or Tooth.
Extended life of parts of machines (Mechanical seal and Bearing etc.)
Easy to install.
AVAILABLE IN TWO VARIANTS :

?? Horizontally split covers : Easy access to grid. Ideal where space is tight.

?? Vertically split covers : Ideal for higher running speeds
SIMPLE AND EASY MAINTENANCE :

Fewer and less complicated components facilitate easy maintenance.

CONSTRUCTION :?A High torque Resilient Coupling basically comprises a grid spring which connects two hubs one on the driving and the other on the driven shafts through axially cut grooves around the peripheries of the two hubs. The spring, which is of special design compatible to the required characteristics of the system. form a series of resilient bridges along the grooves. The grooves are flared to allow the grid members long flexible spans under normal loads as well as better support by the sides of the grooves under over load conditions.

The stiffness of the spring and thus the coupling depends on the length of each flexible span not in contact with the grooves. Subsequently, the contact length changes with every variation in torque. resulting in change in the stiffness of the coupling at every instant during a vibration cycle. Consequently this produces a powerful detuning action resulting in continuous alteration of the torsional vibration frequency and prevention of a build up of resonance in the system.

The principle of design adopted in Resilient Coupling, makes it capable to accommodate considerable axial, parallel and angular misalignment between a driving machine and a driven machine. Simultaneously, it can absorb considerable overloads due to high torque with consequent reduction in wear and tear on plants and machinery. With the use of resilient couplings, break-down and down time in any manufacturing unit, will be minimum.

BENEFITS 😕

1 Protection against shaft misalignment :

Parallel

The movement of the grid in the grooves accommodates parallel misalignment and still permits full functioning of the grid-groove action in damping out shock and vibration.

Angular?

Under angular misalignment, the grid-groove design permits a rocking and sliding action of the grid and hubs without any loss of power through the resilient grid.

Axial :

End float for both driving and driven members is permitted because the grid slides freely in the grooves

2. Protection against Shock loads. Vibration & Thrust loads :

Light Load :

The grid bears near the outer edges of the hub teeth. The long span between the points of contact remains free to flex under load variations.

Normal Load :

As the load increases, the distance between the contact point & on the hub teeth s shortened, but a free span still remains to cushion shock loads.

Shock Load :

The coupling is flexible within its rated capacity. Under extreme over-loads, the grid bears fully on the hub teeth and transmits full load directly.

APPLICATION :

Agitators
Conveyors
Alternators
Cranes
Ball Mills
Crushers
Cement Mills
Fans
Haulages
Paper Mills
Punching Machines
Steam turbines
Machine Tools
Pulp Mills
Refrigerators
Textile Machinery
Mixers
Pulverisers
Rolling Mills
Traction tube Mills
Motor Generators
Pumps
Rubber Machinery
Winders

GENERAL GUIDELINES FOR SELECTION OF COUPLING :

1. Determine service factor corresponding to the type of application under consideration from the Table of Service Factors.

2. Determine the maximum Horse Power : Normal rated H.P x Service, Factor of Drive x Service Factor of Prime Mover.

3. Determine Rating of coupling

After having determined the rating of coupling, select a coupling corresponding to the rating from the Tables of Types & Sizes. and simultaneously check whether maximum bore and recommended speed of the coupling correspond to the requirements of the drive. If the allowable maximum bore is too small. select a larger Coupling: in case allowable safe speed is too low, a different type of Coupling will have to be considered.

EXAMPLE :

Required a coupling to connect a 20 H.P. / 980 R.P.M. Motor to a speed reducer driving an inclined assembly conveyor. Motor shaft diameter is 40mm and reducer shaft diameter is 38mm.

Service factor from Table 1

Prime Mover Factor 1

Note : Transmitted Power at the Coupling should be multiplied by the Prime Mover Factors as above?depending on the type of Prime Mover involved in the drive.

Factors for Paper and Steel Mill drives are for general guidance. As these drives are varied in nature?exact factor is to be arrived at after considering individual drives. Please consult Fenner with drive details.