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GEAR COUPLING

TECHNICAL SPECIFICATIONS CHART

SELECTION PROCEDURE FOR NAV BHARAT GEARED COUPLING

In order to make best possible selection It is essential to take the following factors in consideration before final selection
1) HP to be transmitted
2) Shaft rpm
3) Desirable safety factor
4) Diameter of the larger shaft to be coupled.

Compute effective torque to be transmitted OR horse power per 100 rpm as below:

A). HP/100 rpm = (HP transmitted X 100 X SF)/RPM

B) Effective torque in Kg-MT = (HP transmitted X 726.2 X SF)/RPM

Select the suitable gear coupling from the max torque (Kg-m) column or HP capacity at 100 rpm column.

CROSS CHECK- The selected gear couplmg should be CROSS CHECKED for the maximum allowable shaft diameter from the max bore (d)mm column. The max allowable shaft diameter to be equal to or more than the dimeter of larger shaft to be coupled

The gear coupling size should be fmallsed as the greater of the size selected on power (methed A or B)on maximum allowed shaft diameter.

EXAMPLE (1)

A gear coupling is to be selected to transmit 1000 hp from a fly wheel coupled with electric motor at 740rpm to roughing mill (hot rolling) gear box the fly wheel shaft diameter is 180mm and reduction gear box input shaft diameter is 165mm.

a) Service factor: 3 (from service factor table)

A) HP /100 rpm = (1000 X 100 X 3 )/740=405.4 hp

B) Effective torque m Kg-MT =(1000 X 726.2 X 3)/740 =2944 Kg-MT

While both A&.B lead to gear coupling size 107,but size 109 is selected because of allowable max shaft diameter of 180mm.

EXAMPLE(2)

The above drive hp at output of reduction gear box (110 rpm,shaft dia 235) and input of pinion stand (shaft dia 238mm)

A) HP/100 rpm = (1000 X 100 X 3)/110 =2727 HP

B) Effective torque in Kg-MT =(1000 X 726.2 X 3)/110 =19805 Kg-m

The selected size is gear coupling no.113 as allowable torque is 20,000 Kg-m, HP /100 is 2793. and max bore is 330 mm

Material: 101 to 107 C55 Mn75 Casing and Hub Heat Treated from 235-265 BHN,
108 to 114 Casing - IS:1030 Gr.23-45 Hub C55 Mn75, Casing and Hub Heat Treated from 235-265 BHN.

COUPLING NO.	MIN BORE(d) m.m	MAX.TORQUE IN Kg.m	MAX.SPEED(R.P.M.)	MAX.BORE(d) m.m	MAX.(GD²) IN Kg.m²	H.P(Matric) CAPACITY AT -100 R.P .M.	WT.IN Kg
101	20	100	6300	50	0.14	14	10
102	30	250	5000	60	0.20	35	15
103	40	440	4000	75	0.48	61.5	25
104	45	840	3300	90	0.95	117	40
105	50	1310	2800	110	1.9	183	60
106	65	2000	2500	125	3.0	280	85
107	80	3450	2100	140	5.25	482	120
108	95	4500	1900	160	8.53	630	180
109	105	5600	1700	180	15.05	783	210
110	120	8200	11. 00	220	30.5	1146	290
111	130	11000	1250	260	56.80	1536	550
112	140	14700	1120	300	88.5	2053	710
113	180	20000	1000	330	139	2793	980
114	230	28600	900	370	291.5	3997	1300
115	250	31. 150	800	410	353.0	4856	1700
116	300	60000	110	455	691.0	8385	2550
117	350	85350	630	520	1235.0	11917	3600
118	380	113000	560	610	1965.5	15790	4850
119	420	149000	500	710	3012.0	20821	6400

DIMENSION'S (M.M.)
A	B	C	D	E	F	G	H	M
170	110	65	49	115	17	55	2.5	55
185	125	85	62	135	17	65	2.5	80
220	150	105	78	175	20	85	2.5	105
250	175	130	96	215	20	105	2.5	126
290	200	155	106	230	25	110	5.0	138
315	230	175	117	260	25	125	5.0	155
350	260	205	134	290	25	140	5.0	177
380	290	230	147	320	25	155	5.0	190
430	330	250	156	340	25	165	5.0	208
490	390	310	171	370	25	180	5.0	218
545	445	350	188	410	30	200	10	245
590	490	400	226	490	30	240	10	283
680	555	440	237	530	35	260	10	318
730	610	500	261	570	35	280	10	340
780	660	540	301	655	35	320	15	385
900	755	625	331	720	45	350	20	423
1000	855	720	382	820	45	400	20	490
1100	850	810	426	920	55	450	20	533
1250	1050	910	442	1000	55	485	30	558

FOR (H.R.H.F.)
J	K
57.5	85
67.5	100
87.5	125
107.5	150
115.0	175
130.0	200
145.5	220
160.0	250
170.0	300
185.0	350
1	1
1	1
1	1
1	1
1	1
1	1
1	1
1	1
1	1

MIS ALIGNMENT CAPACITY - AXIAL FLOAT - ⁺-05 UPTO GEAR COUPLING NO 106. ⁺-1 FROM 107 TO 110 ANGULAR - ⁺-15°

FLEXIBLE IN ALIGNMENT RIGID IN QUALITY

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