SUNTES C-53 to C-4510 C-Series Centrifugal Clutches

SUNTES C-53 to C-4510 C-Series Centrifugal Clutches

SUNTES C-Series centrifugal clutches connect an engine or other driving machine to a driven load through centrifugal force and friction. The basic clutch arrangement supports smoother starting and helps protect the shaft system when an overload occurs. The series covers twelve listed models, from C-53 to C-4510, with several shoe configurations and engagement-speed settings.

Progressive engagement and power transmission

At rest, the driving unit and drum are separated, so the clutch does not transmit power through frictional contact. As the driving speed increases, centrifugal force moves the shoes outward against the drum. Torque is progressively transferred while the clutch slips during acceleration. At the intended rated operating speed, the clutch is designed to transmit power without continuing slip. This operating sequence allows the driving machine to accelerate before taking the full driven load; the actual starting behaviour depends on the selected shoe arrangement and the connected machinery.

Construction and service identification

The assembly includes a hub boss, shoe supports, shoes, friction linings, link plates, sleeves, rubber bushes, and the drum rim and flange. Springs, mounting bolts, rivets and locking hardware complete the mechanism. The exploded view is useful when identifying the assembly and discussing service parts. Match the complete clutch model, shoe specification and installation arrangement before ordering replacement components; dimensional similarity alone does not establish interchangeability.

Typical equipment applications

The C-Series is intended for engine-driven drainage pumps, fire pumps, refrigerated-truck compressors and hydraulic pumps used in construction machinery. In these applications, the clutch can help reduce the immediate load imposed on the engine during starting. Application selection should account for engine idle speed, normal running speed, driven-machine starting torque, rotating inertia, acceleration time and the frequency of starts. A clutch selected only by shaft diameter may not provide the required engagement behaviour.

Understanding engagement speed and selection

The specification table distinguishes L, H and G shoes. Their engagement figures are speeds in rpm, not maximum permissible running speeds or torque capacities. For example, C-53 lists 1,240 rpm with L shoes, 990 rpm with H shoes and 740 rpm with G shoes. Dashes identify entries for which no value is listed. The standard shaft bores shown for the smaller units include the H7 tolerance designation; larger models show a dash and require confirmation of the actual shaft arrangement.

C-Series exploded view and component reference numbers

C-Series dimensional drawings

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.

C-Series dimensions (mm)

Model	A	B	C	D	E	F	G	H	J	K	L	M	N
C-53 ①	38	45	10	161	15	35	60	15	35	80	107	27	70
C-73 ①	54	50	7	213	20	50	85	20	50	88	120	32	85
C-93 ①	67	65	7	270	20	70	115	25	70	102	149	47	130
C-123 ②	89	90	7	340	40	80	135	30	80	130	200	70	143
C-136 ②	100	90	6	367	40	85	160	30	85	130	200	70	143
C-156 ③	115	127	6	414	45	115	146	45	115	148	248	94	178
C-186 ③	150	152	8	494	65	127	196	64	150	176	310	110	230
C-218 ③	152	152	7	576	70	150	210	64	150	172	311	112	230
C-248 ③	172	153	6	656	70	165	235	70	165	238	331	93	254
C-308 ③	203	203	13	817	70	175	288	75	200	248	419	133	305
C-368 ③	254	254	12	984	100	200	292	100	200	283	520	184	350
C-4510 ③	254	280	12	1,245	100	225	405	100	225	318	546	228	349

Standard bore, engagement speed and mass

Model	Unit standard shaft bore	Engagement speed (rpm)			Product mass (kg)
		L shoe	H shoe	G shoe	Unit	Drum
C-53	35φH7	1,240	990	740	1.97	4.5
C-73	45φH7	1,120	900	610	5.27	9.1
C-93	55φH7	900	720	520	9.46	18.0
C-123	65φH7	780	590	-	18.54	28.5
C-136	80φH7	660	380	-	28.58	32.5
C-156	-	620	450	370	46.56	54.7
C-186	-	460	330	280	82.4	87.0
C-218	-	420	300	240	92.3	116.0
C-248	-	350	270	220	156.9	158.4
C-308	-	240	170	160	291.0	287.6
C-368	-	240	190	-	322.0	667.0
C-4510	-	160	120	100	640.0	1,090.0

Engagement-speed data use the MAX Set for C-53 through C-123 and the MID Set for C-136 through C-4510. Versions with a higher engagement speed are available for applications requiring idling operation; confirm the required setting before selection. Circled numbers in the dimension table identify drawing groups. Confirm the latest dimensional drawing, allowable operating conditions and complete application rating before manufacture or installation.