Type SM / SMD / SM-DX Fluid Coupling

Description

Constant-fill, fixed-speed coupling in three circuit types.

The Fluidomat Type SM family is a hollow-shaft, compact constant-fill fluid coupling with a rubber flexible coupling on the end. To satisfy the starting and running characteristics of industrial machines, it is offered in three circuit types that bring the starting torque down to as low as 120% of nominal torque.

Type SM (and HF) is the basic coupling without a delayfil chamber, with starting torque adjustable in the range of 180% to 275%. Type SMD (and HFD) adds a delayfil chamber for a wider 150% to 275% range. Type SM-DX (and HF-DX) uses an extended delayfil chamber for the gentlest start of all, 120% to 270%.

Normal operating slip is just 2% to 5% depending on coupling size and starting-torque value. A fusible plug protects against sustained overload, and the coupling is suitable for two consecutive starts from hot and three from cold.

Fluidomat Type SM / SMD / SM-DX fluid coupling cross-section

Key data

120–275%

Starting torque range

2–5%

Normal operating slip

130°C

Fusible plug blow-off (std)

2000

KW max rating (model 16 DC)

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Specification & features

Built for the duty, finished to order

Coupling types SM/SMD/SM-DX are supplied with finished bores on the fluid-coupling shaft. Where finished bores cannot be specified at the time of ordering, a separate shaft bush is provided.

Three circuit types — SM, SMD and SM-DX — to match any starting and running characteristic
Starting torque adjustable down to 120% of nominal for soft starting of high-inertia loads
Hollow-shaft compact design with a rubber flexible coupling on the output end
Low normal operating slip of 2% to 5% for efficient running

Fusible plug blows off at 130°C as standard; 160°C available as an option
Rated for two consecutive starts from hot and three from cold
Supplied in finished bores; separate shaft bush available when bores cannot be specified at ordering
Maximum permissible bore in the shaft bush is denoted Ød5 in the dimension table

Selection data

Rating table — SM / SMD / SM-DX

Maximum ratings in KW at different input speeds (RPM). Couplings for 3000 and 3600 RPM should be selected only after Fluidomat approval is obtained.

Maximum rating (KW) by input speed — Type SM / SMD / SM-DX
Model	600	730	900	970	1200	1470	1800	3000*	3600*
1	—	0.5	0.9	1.2	2.2	4	7.5	20	26
2	—	0.9	1.7	2.2	4.1	7.5	13.7	30	36
3	—	1.3	2.4	3	6	11	18	38	45
4	1	2	4	5	9	16.5	22	45	—
5	2	4	7	9	16.3	30	42	70	—
6	3	5	9	11	22	40	60	110	—
7	4	8	15	18	34	62	85	140	—
8	6	10	18	23	44	80	120	—	—
8 B	9	16	29	36	68	125	180	—	—
9	12	22	41	52	98	172	246	—	—
10	22	39	73	91	172	275	370	—	—
10 B	32	57	107	134	253	373	500	—	—
11	47	85	158	198	374	525	775	—	—
12	82	148	278	348	600	750	—	—	—
13	163	293	550	620	850	1100	—	—	—
16	583	1050	1400	1500	—	—	—	—	—
16 DC	900	1500	1862	2000	—	—	—	—	—

* Couplings for 3000 and 3600 RPM should be selected only after our approval is obtained. Full technical specification, dimension tables, dry weights and oil quantities are given in the sections below.

Product views

Type SM / SMD / SM-DX

Hollow-shaft compact constant-fill coupling — SMD adds a delayfil chamber and SM-DX an extra-long delayfil chamber, with a rubber (flexible) coupling on the input end.

Selection data

Technical specification & dimension table

Overall and mounting dimensions (mm), dry weights and oil filling for the SM, SMD and SM-DX executions. The minimum bore d4 should exceed the withdrawal-bolt diameter M by at least 2 mm.

SM,SMD,SM-DX	ø A	B			ød4 max	ød4 max	Ø 4 max	* Dry Weight			Max. Oil Filling In Litres			Threads 'M'* for Coupling	Connected Flexible Coupling Model
SM,SMD,SM-DX	ø A	SM	SMD	SM-DX	ød4 max	ød4 max	Ø 4 max	SM	SMD	SMD-DX	SM	SMD	SMD-DX	Threads 'M'* for Coupling	Connected Flexible Coupling Model
1	295	147	-	-	38	-	86	24	-	-	1.9	-	-	3/4" BSW	FXC-I
2	328	153	-	-	48	-	90	27	-	-	2.8	-	-	3/4" BSW	FFX1
3	342	158	213	247	42	28	80	27	30	32	2.9	3.9	4.3	3/4" BSW	FFX-1
4	367	160	215	249	50	36	90	30	34	35	3.8	4.3	4.6	3/4" BSW	FFX-1
5	406	190	220	280	65	50	110	40	44	45	4.9	5.8	6.7	1" BSW	FFX-2
6	435	213	239	310	70	53	120	55	59	61	6.5	7.7	9.6	1" BSW	FFX-3
7	471	218	263	333	80	63	135	66	71	73	8	9.4	11.3	1" BSW	FFX-3
8	505	238	279	359	80	63	140	77	83	85	9.7	11.5	14.8	1" BSW	FFX-4
8 B	553	250	290	380	95	70	155	96	102	105	14.5	16.1	19.1	1 1/4" BSW	FFX-4
9	584	255	305	385	95	80	155	104	110	113	16.1	19.3	20.8	1 1/4" BSW	FFX-4
9 B	620	270	335	430	95	80	160	150	165	168	19.4	21.5	24.7	1 1/2" BSW	FP-1/FFX-5
10	644	280	329	424	110	85	170	170	180	185	25.1	28.1	33.9	1 1/2" BSW	FP-1/FFX-5
10 B	714	310	355	451	110	85	190	210	225	230	31.8	36.5	45.4	1 1/2" BSW	FP-2A
11	751	320	375	471	120	100	200	254	268	273	37.1	42.9	49	# Ø50-8P	FP-2A
12	845	359	435	555	130	110	240	310	345	355	51.3	65.6	71.5	# Ø50-8P	FP-2B
13	960	441	489	619	150	-	270	440	480	495	72.4	91.3	106.6	# Ø50-8P	FP-3
14	1104	451	494	624	160	-	275	682	730	745	114.7	131.9	153.9	# Ø65-16P	FP-4B
15	1230	485	594	724	160	-	275	850	920	940	147.6	181.4	193.1	# Ø75-16P	FP-4B
16	1298	586	668	798	190	-	320	-	1250	-	189.2	241.7	268.4	# Ø75-16P	**
**16 DC	1298	831	-	-	190	-	320	-	1800	-	-	-	-	# Ø75-16P	**

* Dry weight with connected flexible coupling. # Square threads. ** Model 16 — refer to us for detail. All dimensions in mm.

Connected flexible coupling

Flexible coupling & brake-drum data

Connected flexible-coupling models — internal-hub / external-hub and pad-type — and brake-drum mounting dimensions for the inner-wheel-drive arrangement.

Model SM-SMD-SM-DX	Internal Hub			External Hub
Model SM-SMD-SM-DX	Ød1 max.	l1 max.	l1	Ød2 max.	l2 max.	l2
3,4	48	67	67	60	75	130
5	60	72	72	75	90	150
6,7	80	92	72	90	110	170
8,8B,9	90	102	87	100	120	195
9B,10	-	-	-	125	150	230

Model SM-SMD-SM-DX	Pad Type Coupling
Model SM-SMD-SM-DX	Ød3 max.	l3	l3
9B, 10	100	110	120
10B,11	120	140	151
12	140	155	167
13	160	180	179
14	160	180	194
15,16	180	200	214

Brake-drum mounting — Type SM/SMD/SM-DX (inner-wheel drive)

Flexible Coupling Model	Spider Type Coupling
Flexible Coupling Model	øE	C	Z	Ø 2	L2
FFX-1	200	75	20	75	130
FFX-1	250	95	0	75	130
FFX-2	250	95	20	90	150
	300	118	5	90	158
	315	118	5	90	158
FFX-3	300	118	17	110	170
	315	118	17	110	170
	400	150	5	110	190
FFX-4	300	118	42	120	195
	315	118	42	120	195
	400	150	10	120	195
	500	190	5	120	230
*FFX-5	400	150	29	150	230
*FFX-5	500	190	5	150	246

* For fluid-coupling models SM/SMD/SM-DX 9B & 10. Dimensions in mm.

Selection data

Mass moment of inertia “J” with oil (kg·m²)

Outer-wheel and inner-wheel inertia for the SM, SMD and SM-DX ranges.

Model	Outer Wheel	Inner Wheel
SM-3	0.22	0.04
SM-4	0.33	0.06
SM-5	0.68	0.21
SM-6	0.89	0.24
SM-7	1.32	0.34
SM-8	1.72	0.37
SM-8B	2.4	0.64
SM-9	2.82	0.75
SM-9B	4.65	1.53
SM-10	5.01	1.72
SM-10B	10.15	2.9
SM-11	11.66	3.41
SM-12	18.3	5.56
SM-13	35.74	12.22
SM-14	61.55	21.7
SM-15	93.13	33.7
Model	Outer Wheel	Inner Wheel
SMD-3	0.23	0.04
SMD-4	0.35	0.06
SMD-5	0.71	0.21
SMD-6	0.97	0.24
SMD-7	1.47	0.34
SMD-8	1.85	0.39
SMD-8B	2.61	0.67
SMD-9	3.06	0.78
SMD-9B	5.09	1.58
SMD-10	6.07	1.79
SMD-10B	11.3	3
SMD-11	12.97	3.55
SMD-12	20.33	5.86
SMD-13	39.82	12.75
SMD-14	68.04	22.56
SMD-15	102.7	35.07
SMD-16	162	54.1
Model	Outer Wheel	Inner Wheel
SMDX-3	0.24	0.04
SMDX-4	0.36	0.06
SMDX-5	0.74	0.21
SMDX-6	1.04	0.24
SMDX-7	1.59	0.34
SMDX-8	1.96	0.39
SMDX-8B	2.76	0.67
SMDX-9	3.24	0.78
SMDX-9B	5.55	0.58
SMDX-10	7.04	1.79
SMDX-10B	12.3	3
SMDX-11	14.07	3.55
SMDX-12	21.93	5.86
SMDX-13	43.02	12.75
SMDX-14	73.14	22.56
SMDX-15	110.7	35.07

Construction & operation

Oil circuit & starting-torque characteristics

Three circuit executions give starting torque from 120–275% of nominal; the delayfil chamber shapes the acceleration curve.

Oil circuit & oil levels with delayfil chamber

Starting-torque characteristics with & without delayfil chamber

Typical applications

Soft starting across rotating equipment

Belt conveyors Bucket elevators Crushers Ball & rod mills Centrifugal pumps Fans & blowers Screw conveyors Mixers & agitators

Constant-Fill CouplingsFixed-speed soft-start range Variable Speed ScoopType SC energy-saving range Catalogues & drawingsDimension tables & data sheets

Need help selecting the right SM size?

Send us your motor rating, speed and driven-machine details and our application engineers will recommend the correct SM, SMD or SM-DX model.

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