SERVOFLEX SFR

Newly developed rubber element achieves high damping performance. A coupling with high damping performance thatcan be used for high-speed, high-precision operation of servo motors, etc. No backlash due to frictional power transmission. By adopting HNBR for the element, vibration is quickly damped compared with flexible couplings that use metal elements. This suppresses the resonance phenomenon a concern in the drive system and provides stable high-speed control that can avoid resonance in a wide range of operating speeds.

Features

Specifications

Structure and Materials

Downloads

Features of SFR Models

Excellent damping performance

The SERVOFLEX SFR rubber element couplings provide better damping performance than standard metal disc couplings.

Shaft counterforce is also reduced

Assembly structure with certain gap greatly reduce the reaction force in the eccentric and axial directions.

A wide range of variations and options available

Low inertia by suitable hub shape depends on bore size. You can also select various options.

Integrated element structure of hard rubber and insert

Clamp hub and element is assembled by friction force of tightening bolts. Optimal design with the help of the latest CAE system,FEM (finite element method).

SFR Models

[Specifications]

Model	Shape type	Rated	Misalignment			Max. rotation speed ［min^-1］	Torsional stiffness ［N･m/rad］	Axial stiffness [N/mm]	Moment of inertia ［kg･m²］	Mass［kg］
Model	Shape type	torque ［N･m］	Parallel ［mm］	Angular ［゜］	Axial ［mm］	Max. rotation speed ［min^-1］	Torsional stiffness ［N･m/rad］	Axial stiffness [N/mm]	Moment of inertia ［kg･m²］	Mass［kg］
SFR-030SA1	A	5	0.2	1.5	±0.3	10000	396	413	6.62×10^-6	0.048
	B								8.65×10^-6	0.054
	C								10.76×10^-6	0.063
SFR-035SA1	C	10	0.2	1.5	±0.3	10000	607	416	26.98×10^-6	0.105
SFR-040SA1	A	12	0.2	1.5	±0.3	10000	1128	605	25.37×10^-6	0.103
	B								31.96×10^-6	0.114
	C								38.64×10^-6	0.128
SFR-050SA1	A	25	0.2	1.5	±0.3	10000	2775	658	85.36×10^-6	0.216
	B								105.75×10^-6	0.234
	C								128.36×10^-6	0.263

* Types A/B/C are automatically specified by Miki Pulley according to the combination of bore diameters you select, and cannot be specified by the customer. * Check the standard bore diameter list as rated torque may be restricted by the holding power of the shaft connection component. * Max. rotation speed does not take into account dynamic balance. * Torsional stiffness values are analysis values for the element taken at a temperature of 20℃. * The moment of inertia and mass are measured for the maximum bore diameter.

[Dimensions]

Model	Shape type	d1[mm]		d2[mm]		D[mm]	N[mm]	L[mm]	LF[mm]	LP[mm]	S[mm]	A1[mm]	A2[mm]	C[mm]	d3 [mm]	M Quantity - Nominal dia.	Tightening torque [N・m]
Model	Shape type	Min.	Max.	Min.	Max.	D[mm]	N[mm]	L[mm]	LF[mm]	LP[mm]	S[mm]	A1[mm]	A2[mm]	C[mm]	d3 [mm]	M Quantity - Nominal dia.	Tightening torque [N・m]
SFR-030SA1	A	5	10	5	10	34	21.6	37.8	12.4	11	1	8	-	3.75	15.5	1-M3	1.5～1.9
	B	5	10	Over10	16		21.6					8	12.5			1-M3	1.5～1.9
	C	Over10	15	Over10	16		-					-	12.5			1-M3	1.5～1.9
SFR-035SA1	C	6	18	6	19	39	-	48	15.5	15	1	-	14	4.5	18.5	1-M4	3.4~4.1
SFR-040SA1	A	8	15	8	15	44	29.6	48	15.5	15	1	11	-	4.5	23.5	1-M4	3.4~4.1
	B	8	15	Over15	24		29.6					11	17			1-M4	3.4~4.1
	C	Over15	22	Over15	24		-					-	17			1-M4	3.4~4.1
SFR-050SA1	A	8	19	8	19	56	38	59.8	20.5	17.4	0.7	14.5	-	6	29.5	1-M5	7.0~8.5
	B	8	19	Over19	30		38					14.5	22			1-M5	7.0~8.5
	C	Over19	28	Over19	30		-					-	22			1-M5	7.0~8.5

* Types A / B / C are automatically specified by Miki Pulley according to the combination of bore diameters you select, and cannot be specified by the customer. * The d3 dimension is the inner diameter of the element. For d2 dimension exceeding this value, shaft can be inserted only up to LF dimension to the d2 side hub. * The nominal diameter for the clamping bolt M is equal to the quantity minus the nominal diameter of the screw threads, where the quantity is for a hub on one side.

[Standard bore diameter]

Standard (option) bore diameter, d1/d2 [mm] and restricted rated torque [N･m]
Nominal bore diameter			5	6	6.35	7	8	9	9.525	10	11	12	13	14	15	16	17	18	19	20	22	24	25	28	30
Shaft tolerance	h7(h6･g6)	B	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	j6(Option)	J																	〇		〇	〇		〇
	k6(Option)	K					〇	〇						〇		〇			〇		〇	〇
Supported bore diameter for each mode	SFR-030SA1	d1	2.8	3.4	●	●	●	●	●	●	●	●	●	●	●
	SFR-030SA1	d2	2.8	3.4	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-035SA1	d1		5	5	6.6	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-035SA1	d2		5	5	6.6	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-040SA1	d1					9	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-040SA1	d2					9	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1	d1					18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1	d2					18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●

* The shaft tolerance for standard bore diameter is h7 (h6 or g6): designation B. * Shaft tolerances j6/k6: designations J/K are optional, and are only supported for bore diameters marked with ○ . * Bore diameters marked with ● or numbers are supported as the standard bore diameters. Consult Miki Pulley regarding special arrangements which may be possible for other bore diameters. * Bore diameters whose fields contain numbers are restricted in their rated torque by the holding power of the shaft connection component because the bore diameter is small. The numbers indicate the rated torque [N?m].