Technical Details of Highly Flexible Coupling

Shankar Couplings (Flexible Elastomeric Coupling & Spares)

SELECTING SHANKAR COUPLING OF THE CORRECT TYPE AND SIZE

When selecting the coupling, essential factors are the nominal torque of the drive unit, and the service factor k. The factor k can be read from the table below for any combination of driving and driven units. A coupling is correctly selected if the maximum permissible coupling torque (Tk) is larger than or at least as large as the calculated maximum torque (T), by multiplying nominal torque with k.

N	(kW)	=	nominal power to be transmitted
n	(rev/min)	=	speed
k	(Service Factor)	=	k1 . k2 . k3 . k4
T	(daNm)	=	max torque = 955.N/n.k
T4	(daNm)	=	max. coupling torque

Tk > T		=	requirement

Lowest Possible Service Factor k, for Duties a) to f)	Motors : Piston engines 1 - 3 cyl.
	Water turbines : Piston eng 4 - 6 cyl.
	Electric motors and steam turbines

Examples of Drive Units :
a)	*with constant operation and light mass to be accelerated :* Centrifugal pumps for fluids, electric generators, small fans, reduction gear shafting, etc.

Factor k1

1,2

1,4

b)	*with constant operation somewhat greater mass to be accelerated :* Platebenders, elevators, belt conveyors for bulk materials, agitators for liquids, light textile machines, turboblowers and compressors, medium fans, rotary machine tools, etc.

1,4

1,7

with irregular operation, medium mass to be accelerated :
panel planing, rotary compressors, rotary kilns, belt conveyors for piece goods, hoisting drums, generators, winches, wood planers, centrifugal pumps for semi-liquid materials, cooling drums, goods lifts, mixers, winnowing machines, ring spinning frames, agitators, for semi-liquid materials, grinders, vibrating screens, industrial fans, hoist, etc.

1,4

1,7

with irregular conveyors, medium mass to be accelerated, and shock effect :
Concrete mixers, drop hammers, tanning drums, mine fans, overhead conveyors, metal planers, pulping machines, chain conveyors, kneading machines, piston pumps and compressors, cranes, ball mills, millstones, passenger lifts, slat conveyors, pressure pumps, vane pumps, tube mills, rotary drums, light roller tables, marine drives, centrifuges, winches, drying drums and drying kilns, roller frames, washers, looms, separators, etc.

1,7

2,4

with irregular operation, large mass to be accelerated, and heavy shock
effect :
Dredges, rolling mills, crushes, pulpers, calenders, piston pumps with light flywheels, pan grinders, briqueting presses, drilling equipment, rotary shaking screens, ram moulding machines, cutter, forging presses, stamping machines, sugar cane crushers, etc.

2,4

2,8

f)	*with irregular operation, very large mass to be accelerated, and extreme shock effect :* Horizontal saws, piston compressors and pumps without flywheels, heavy roller tables, welding generators, rock crushes, multiple blade saw frames, roller mills for metal, brick presses, etc.

2,4

2,8

3,3

Lowest possible service factors k2 for start-up frequency.

Number of starts per hour

from
upto

1
20

20
40

40
80

80
160

160

Type of operation as per above table for factor k1

Factor k2

a)
b)

1
1

1,2
1,09

1,3
1,18

1,5
1,37

1,6
1,46

2
1,8

c)
d)

1
1

1,08
1,07

1,17
1,15

1,25
1,23

1,33
1,23

1,65
1,55

e)
f)

1
1

1,07
1,06

1,12
1,08

1,18
1,1

1,32
1,1

Lowest possible service factors k3 for operating period.

Daily operation period
from	2	8	16
upto	8	16	hrs.
Factor k3
0,9	1	1,12	1,25

Lowest possible service factors k4 for ambient temperature °C.

Factor k4

1,1

1,2

1,3

Shankar Coupling

DIMENSIONS AND OTHER TECHNICAL DATA

Coup Size (D1) mm.	Max Torque (Tk) daN-m	Mate-rial	Max Speed rpm	KW RPM	Bore Min d1 mm	Bore Max d1 mm	D2 mm	S1 mm	ls mm	Ls mm	Moment of Inertia Kgm2	Weight Kg
50	2.3	Al.	12500	0.0023	6	19	33`	2.0±0.5	25	52.0	0.00004	0.16
67	4.0	Al.	10000	0.0039	8	28	46	2.5±0.5	30	62.5	0.00008	0.36
82	9.0	C.I.	8000	0.0092	10	32	53	3.0±0.5	40	83.0	0.0006	1.76
97	19	C.I.	7000	0.0193	12	42	69	3.0±1.0	50	103.0	0.0014	3.46
112	30	C.I.	6000	0.0308	12	48	79	3.5-1.0	60	123.5	0.0026	5.0
128	48	C.I.	5000	0.0493	20	55	90	3.5±1.0	70	143.5	0.0056	7.9
148	75	C.I.	4500	0.0770	25	65	107	3.5±1.0	80	163.5	0.0095	12.3
168	125	C.I.	4000	0.1283	25	75	124	3.5±1.5	90	183.5	0.0230	18.4
194	201	C.I.	3500	0.2070	30	85	140	3.5±1.5	100	203.5	0.0447	26.3
214	300	C.I.	3000	0.3080	30	95	157	4.0±2.0	110	224.0	0.0753	35.7
240	480	C.I.	2750	0.4932	48	110	179	4±2	120	244	0.1253	46.7
265	750	C.I.	2500	0.7704	58	120	198	5.5±2.5	140	288.5	0.2153	66.3
295	1000	C.I.	2250	1.0260	58	130	214	8±2.5	150	308	0.3428	84.8
330	1300	C.I.	2000	1.3340	68	150	248	8±2.5	160	328	0.6303	121.3


after measuring vertically and horizontally over 1/2 turn.

MAXIMUM POSSIBLE ALIGNMENT TOLERANCES

Coupling size	50	67	82	97	112	128	148	168	194	214
Axial off-set x (mm)	±0.5	±0.5	±1.0	±1.0	±1.0	±1.0	±1.0	±1.5	±1.5	±2.0
Radial Off-set Y (mm)	0.5	0.5	0.5	0.5	0.5	0.6	0.6	0.6	0.7	0.7
Angular Off-set Z (mm)	0.5	0.5	0.5	0.5	0.6	0.6	0.6	0.6	0.8	0.8

SHANKAR COUPLING (DESIGN NOTES)

Shankar is a flexible elastomeric coupling which is specially designed for blind assembly applications. These are extensively used for Disel Engine Drives, Conveyors, Compressors, Pumps, Agitators, Mixers, low or high speed gear boxes and many other Drive Units. In standard range of designs for shaft to shaft or flange to shaft drives, this is truly a No-Bolt coupling. Therefore, this allows for a simple and easy installation procedure. However a separately screwed retaining ring may be fitted, to ease replacement of rubber elements in situ, without moving the adjacent equipments. A spacer design or tailor-made design can also be supplied on request.

Flexible elements, made from Synthetic rubber with 70-80 shore hardness, ensures a positive engagement in compression for claw-type design of Shankar Coupling. Standard hubs are manufactured from cast iron. Ex-stock coupling range caters for rating from 0.5 HP/1000 rpm to 200 HP/1000 rpm. For larger ratings please contact with specific details.

Shankar Couplings normally have an inherent property of being balanced during manufacturing with pilot bore condition. However, additional dynamic balancing can be done, if required.

Specific Advantages of Shankar Coupling :

Provides damping of Torsional Vibration.
Handles radial, axial and angular misalignments with care.
Reduces noise and accommodates shock load.
Renders longer life
Requires no lubrication
Ensures easy Installation.

Printable PDF format

Close This Window

ESBI HI-FLEX PRIVATE LIMITED

Regd. Office : 8 Camac Street (6th floor), Kolkata - 700 017
Phone : 2282 3520/4844 Fax : 91 033 22829100 cable : ESBICOUP For further informations, please email us at : corporate@esbi.info

Site developed and maintained by : M. B. Technosoft Consultants (P) Ltd.