Coupling	kW at	Rated Torque	Max.	Bore OD		Dimensions (mm)						No. Of
Size	100 rpm	Nm	rpm	MIN.	Max.	0A	OB	G	L	M	TL	Pins
LBC 1	0.81	77	6100	12,7	30	95	44	3	38	58	79	3
LBC 2	3.25	310	5100	12.7	35	114	51	3	48	70	99	4
LBC – 2A	5.40	516	4400	16	45	130	67	3	51	70	105	6
LBC 3	6.50	621	3600	16	50	160	75	5	51	114	107	4
LBC 4	8,70	831	3000	20	70	191	105	5	60	114	125	4
LBC – 4A	13	1241	3000	20	70	191	105	5	60	114	125	6
LBC 5	17.40	1662	2600	25	80	225	115	5	76	114	157	6
LBC – 6	24.70	2359	2300	45	100	254	140	5	89	114	183	8
LBC – 6A	30.70	2932	2300	45	100	254	140	5	89	114	183	10
LBC – 6B	37	3533	2300	45	100	254	140	5	89	114	183	12
LBC 7	43.50	4154	1950	60	115	290	170	5	115	114	235	12
LBC – 7A	54.40	5195	1900	60	120	300	180	5	115	130	235	14
LBC – 8	60.90	5816	1850	65	130	310	195	5	125	130	255	16
LBC – 8A	76.10	7268	1650	65	135	340	200	5	130	130	265	18
LBC – 8B	91.40	8729	1590	70	140	360	210	6	135	200	276	12
LBC 9	104	9932	1470	80	150	390	225	6	155	200	316	13
LBC – 9A	139	13274	1400	90	160	410	240	6	165	200	336	15
LBC – 10	151	14420	1300	100	170	440	255	6	180	200	366	16
LBC – 10A	189	18050	1200	110	180	480	270	6	190	212	386	17
LBC = 11	249	23780	1080	120	190	530	285	6	200	212	406	20

BUSH TYPE FLEXIBLE COUPLING SELECTION

The function of a flexible coupling is to transmit torque from one shaft to another in cases where limited misalignment may occur and also to absorb shock loads.
The MSB Bush Type Flexible Coupling of the cushioned drive type, transmits the torque through high tensile steel bolts to the machine input shaft. Highly developed rubber compounds are used in bushes to absorb shock loads, torsional vibrations and slight misalignments.

Simple and compact in construction, the MSB Coupling is capable of transmitting high torques at maximum speeds. The flanges are manufactured with cast iron, grade 20 of IS. 210. This type of coupling permits drive in either direction and requires neither lubrication nor adjustment after fitting. The flexible bushes remain unaffected by water, dust and atmospheric conditions.

Machines which are to be coupled by flexible couplings should first be aligned with all possible accuracy. The capacity of the coupling will then deal with misalignments which occur by reason of temperature variations or heavy shaft loading. Setting of machine foundations or bearing wear will also cause extra loading to be imposed on the coupling. Any, or all of these conditions can occur once the machines have been coupled.

Flanges are bored to suit requirements and are keywayed to British Standard Specification, unless otherwise stated. They can also be supplied with the listed minimum bore to permit machining on site.

Power requirements for the standard couplings range from 0.81 Kw to 249 Kw at 100 r.p.m. and sizes from BC1 to NBC11
Details required for coupling selection are:

1. Type of driven machine and operating hours per day.

2. Speed and power absorbed by driven machine (If absorbed power is not known, it is calculated based on power rating of the prime mover).

3. Diameter of shafts to be connected.

PROCEDURE:

a) Service Factor: Determine the required service factor from Table 1.

b) Design Power: Multiply the normal running power by the service factor. This gives the Design Power which is used as a basis for selecting the coupling.

c) Coupling Size: Refer to Table 3 and from the appropriate speed, read across until a power greater than that required in step (b) is found. The size of coupling required is given at the head of that column.

d) Bore Size: Check from dimension in Table 2, whether the chosen flanges can accommodate the required bores.

 

TABLE 1 : SERVICE FACTORS	PRIME MOVER
DRIVEN MACHINE	Electric Motor Steam Turbine Shafting	Steam Engine Water Turbine	IC Engine Multi-Cylinder	IC Engine Single Cylinder Diesel Multi-Cylinder	Diesel Engine Single Cylinder
Even Torque Machines; Smooth Loads, Generators; Centrifugal Pumps; Blowers; Small Fans; Line Shafting.	1.00	1.25	1.50	2.00	2.50
Machine Tools (light); Beaters; Exhausters; Wood-working Machines (light); Alternators; Welding Generators; Textile Machines.	1.25	1.50	1.75	2.25	2.75
Multi-Crank Compressors and Pumps; Generators (fluctuating loads); Rotary Dryers & Screens; Rotary Compressors; Planers; Wood-Working Machines (heavy); Pulp Grinders; Shakers; Mine Fans	1.50	1.75	2.00	2.75	3.00
Wire Mills; Cement Mills; Small Printing Presses.	1.75	2.00	2.25	3.00	3.25
Single Crank Compressors & Pumps; Hammers; Ball & Tube Mills; Rolling Mills (light); Shearing Machines; Punches; Rock& Stone Crushers; Brick Making and similar Machines; Printing Presses (large); Grinders; Pulverisors; Cranes & Winches; Mechanical Shovels & Dredges; Winding Gears and Drums.	2.00	2.25	2.50	3.25	3.50
Heavy Rolling Mill Drives; Continuous, Prolonged & Reversing Drives; Severe Traction and Haulage Loads.	2.25	2.50	2.75	3.50	3.75

BUSH TYPE FLEXIBLE COUPLING SELECTION

The function of a flexible coupling is to transmit torque from one shaft to another in cases where limited misalignment may occur and also to absorb shock loads.
The MSB Bush Type Flexible Coupling of the cushioned drive type, transmits the torque through high tensile steel bolts to the machine input shaft. Highly developed rubber compounds are used in bushes to absorb shock loads, torsional vibrations and slight misalignments.

Simple and compact in construction, the MSB Coupling is capable of transmitting high torques at maximum speeds. The flanges are manufactured with cast iron, grade 20 of IS. 210. This type of coupling permits drive in either direction and requires neither lubrication nor adjustment after fitting. The flexible bushes remain unaffected by water, dust and atmospheric conditions.

Machines which are to be coupled by flexible couplings should first be aligned with all possible accuracy. The capacity of the coupling will then deal with misalignments which occur by reason of temperature variations or heavy shaft loading. Setting of machine foundations or bearing wear will also cause extra loading to be imposed on the coupling. Any, or all of these conditions can occur once the machines have been coupled.

Flanges are bored to suit requirements and are keywayed to British Standard Specification, unless otherwise stated. They can also be supplied with the listed minimum bore to permit machining on site.

Power requirements for the standard couplings range from 0.81 Kw to 249 Kw at 100 r.p.m. and sizes from BC1 to NBC11
Details required for coupling selection are:

1. Type of driven machine and operating hours per day.

2. Speed and power absorbed by driven machine (If absorbed power is not known, it is calculated based on power rating of the prime mover).

3. Diameter of shafts to be connected.

PROCEDURE:

a) Service Factor: Determine the required service factor from Table 1.

b) Design Power: Multiply the normal running power by the service factor. This gives the Design Power which is used as a basis for selecting the coupling.

c) Coupling Size: Refer to Table 3 and from the appropriate speed, read across until a power greater than that required in step (b) is found. The size of coupling required is given at the head of that column.

d) Bore Size: Check from dimension in Table 2, whether the chosen flanges can accommodate the required bores.

 

TABLE 1 : SERVICE FACTORS	PRIME MOVER
DRIVEN MACHINE	Electric Motor Steam Turbine Shafting	Steam Engine Water Turbine	IC Engine Multi-Cylinder	IC Engine Single Cylinder Diesel Multi-Cylinder	Diesel Engine Single Cylinder
Even Torque Machines; Smooth Loads, Generators; Centrifugal Pumps; Blowers; Small Fans; Line Shafting.	1.00	1.25	1.50	2.00	2.50
Machine Tools (light); Beaters; Exhausters; Wood-working Machines (light); Alternators; Welding Generators; Textile Machines.	1.25	1.50	1.75	2.25	2.75
Multi-Crank Compressors and Pumps; Generators (fluctuating loads); Rotary Dryers & Screens; Rotary Compressors; Planers; Wood-Working Machines (heavy); Pulp Grinders; Shakers; Mine Fans	1.50	1.75	2.00	2.75	3.00
Wire Mills; Cement Mills; Small Printing Presses.	1.75	2.00	2.25	3.00	3.25
Single Crank Compressors & Pumps; Hammers; Ball & Tube Mills; Rolling Mills (light); Shearing Machines; Punches; Rock& Stone Crushers; Brick Making and similar Machines; Printing Presses (large); Grinders; Pulverisors; Cranes & Winches; Mechanical Shovels & Dredges; Winding Gears and Drums.	2.00	2.25	2.50	3.25	3.50
Heavy Rolling Mill Drives; Continuous, Prolonged & Reversing Drives; Severe Traction and Haulage Loads.	2.25	2.50	2.75	3.50	3.75

B-FLEX COUPLINGS

 

MSB B-FLEX couplings consist of a set of resilient BARREL shaped bushes with pins & nuts and two flanged hubs of graded cast iron.
These special BARREL shaped bushes permit the MISALIGNMENT IN ALL DIRECTIONS and give extra torsional flexibility as compared to plain bushes. These couplings are suitable for general engineering application requiring reliable power transmission even under conditions of shaft misalignments which are often unavoidable.

FEATURES

SIMPLICITY OF CONSTRUCTION

Easy to assemble & disassemble. Suitable for independent running of the drive.

VARYING STIFFNESS CHARACTERISTICS

Special barrel shaped bushes provide progressively increasing stiffness characteristics, hence ensure effective shocks & vibration absorption.

NO LUBRICATION

B-FLEX couplings never require lubrication of any kind.

SIMPLE/EASY MAINTENANCE

No complicated mechanism to demand adjustment or maintenance. Inspection and replacement of bushes is easy and bushes can be quickly fitted without dismantling or moving either of coupled shafts.

LOW OPERATIONAL COST

Only wearing part is low cost bushes which make coupling economical in long run.

SMOOTH & QUIET OPERATION

Reduces vibration & noise arising from severe torque fluctuations.