SUNTES NCL-136 to NCL-308, NCL1B and NCL2B Lock-Type Centrifugal Clutches

SUNTES NCL-136 to NCL-308, NCL1B and NCL2B Lock-Type Centrifugal Clutches

SUNTES NCL lock-type centrifugal clutches combine a centrifugal clutch and a gear clutch in a compact compound assembly. The range includes NCL, NCL1B and NCL2B configurations, each listed in sizes 136, 156, 186, 218, 248 and 308. The gear-clutch section provides a selectable mechanical connection, while the centrifugal section controls progressive load transmission as the engine accelerates.

Gear clutch ON: progressive starting

With the gear clutch in the ON position, the centrifugal clutch gradually transmits the load while slipping as engine speed rises. At the intended rated operating speed, the assembly is designed to transmit power without continuing slip. The illustrated construction identifies the drive shaft, gear clutch, shifter lever, centrifugal clutch and drum. These components perform different functions and should be considered together when reviewing the drive arrangement.

Gear clutch OFF and switching restriction

With the gear clutch OFF, the centrifugal clutch section does not transmit power even if the engine rotates. The ON/OFF position is changed by sliding the shifter lever. The NCL operating instructions expressly require that ON/OFF switching must not be performed while the engine is running. The selector is therefore not an operating control for shifting a running engine between connected and disconnected states. Incorporate this restriction into the machine operating procedure and confirm the installation-specific control arrangement.

Applications and configuration choice

The compound clutch concept supports applications involving engine-only operation, prevention of reverse rotation of the driving machine, automatic engine/motor changeover, cushioned starting and flexible coupling functions. Which functions are provided depends on the complete system arrangement. Application illustrations include engine-driven vertical-shaft and horizontal-shaft pumps. Review the drive layout, operating sequence and required coupling function before choosing a configuration; the three dimensional variants should not be assumed to be interchangeable.

NCL, NCL1B and NCL2B dimensional differences

The tables retain all eighteen model codes and distinguish the dimensional data for each configuration. NCL1B has two complementary tables: the first gives the main lettered dimensions and the second gives the remaining diameters and mass. Both rows for a particular NCL1B model must be used together. For size 136, the listed masses are 145 kg for NCL-136, 205 kg for NCL1B-136 and 265 kg for NCL2B-136. At size 308, they are 890 kg, 970 kg and 1,050 kg respectively. These differences affect layout, support and handling planning.

Selection and order preparation

Provide the exact configuration prefix and size, driving-machine speed and power, driven load, shaft and mounting dimensions, starting frequency and required operating sequence. Include whether the system uses an engine alone or an engine/motor arrangement. Dimensional data and mass do not establish the allowable torque or a universal engagement-speed setting. Confirm the required performance, alignment, support and installation details for the complete assembly before ordering.

NCL component arrangement: drive shaft, gear clutch, shifter lever, centrifugal clutch and drum

NCL dimensional drawing

NCL1B dimensional drawing

NCL2B dimensional drawing

Models, dimensions and technical data

Dimensions are in millimetres unless otherwise specified. Lettered dimensions refer to the corresponding drawings; diameter symbols and drawing references are retained.

NCL dimensions and mass

Model	A	B	C	D	J	K	M	φP	φR	φS	φT	φU	φW	Mass (kg)
NCL-136	853	335.5	90	200	600	280	673	30	85	143	367	70	85	145
NCL-156	1,008	421.5	127	243	600	280	673	45	115	178	414	85	95	195
NCL-186	1,105	427.5	152	286	630	320	913	65	150	230	494	95	110	290
NCL-218	1,148	470.5	152	284	630	320	913	65	150	230	576	95	110	350
NCL-248	1,330	522.0	153	331	680	320	965	70	165	254	656	125	150	520
NCL-308	1,432	614.0	203	381	740	370	1,126	75	200	305	817	140	190	890

NCL1B main dimensions

Model	A	B	C	D	E	F	G	H	J	K	M
NCL1B-136	853	90	260	269.5	335.5	90	200	125	600	280	673
NCL1B-156	1,008	110	300	286.5	421.5	127	243	140	600	280	673
NCL1B-186	1,105	145	355	322.5	427.5	152	286	155	630	320	913
NCL1B-218	1,148	145	355	322.5	470.5	152	284	155	630	320	913
NCL1B-248	1,330	160	418	390.0	522.0	153	331	190	680	320	965
NCL1B-308	1,432	170	430	388.0	614.0	203	381	215	740	370	1,126

NCL1B additional diameters and mass

Model	φP	φR	φS	φT	φU	Mass (kg)
NCL1B-136	30	85	143	367	70	205
NCL1B-156	45	115	178	414	85	255
NCL1B-186	65	150	230	494	95	350
NCL1B-218	65	150	230	576	95	425
NCL1B-248	70	165	254	656	125	600
NCL1B-308	75	200	305	817	140	970

NCL2B dimensions and mass

Model	A	B	C	D	E	H	J	K	M	φT	φU	Mass (kg)
NCL2B-136	1,303	90	260	269.5	513.5	125	600	280	673	367	70	265
NCL2B-156	1,498	110	300	286.5	611.5	140	600	280	673	414	85	315
NCL2B-186	1,690	145	355	322.5	657.5	155	630	320	913	494	95	410
NCL2B-218	1,752	145	355	322.5	719.5	155	630	320	913	576	95	495
NCL2B-248	2,075	160	418	390.0	849.0	190	680	320	965	656	125	680
NCL2B-308	2,122	170	430	388.0	874.0	215	740	370	1,126	817	140	1,050

Do not operate the ON/OFF shifter while the engine is running. All dimensions refer to the drawing for the specified configuration. Use both NCL1B tables together. Confirm current dimensions and the application rating before manufacture or installation.