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Products : > Coupling > Zero Backlash Jaw Coupling

▶ Zero Backlash Jaw Coupling

Feature

- Backlash-zero coupling
- Exellently endurable and rigid against high torsion
- Maintenance and repair are unnecessary-lubrication is
also unrequired
- An elastic spiter reduces the impact of a pit load

Application examples

- Electric motor
- Position control-positioning
- Robot system
- Direct drive of boring and grinding machines
- Machining centers
- Medical equipments
- Servomotors
- X-Y and X-Y-Z axial driving

A SJC-type coupling has such characterisics as cannot be seen in other couplings owing to its perculiar construction.
It means that the coupling has a complex feature that combines characteristics of a backlash-zero metal spring coupling and those of a coupling taking advantage of a common rubber elastic body.
Accordingly, a SJC-type coupling is divided into 2 usages-one usage is the backlash-zero method adopted in order to deliver the angle of rotation and another usage is a method adopted in order to mainly deliver torque. Because each usage has distinguished sleeves of different hardness, please choose a proper coupling.

Sleeve	Attachment
Hardness	Color	SET SCREW TYPE	CLAMP TYPE
92	Blue	SJC-☆☆-GR	SJC-☆☆-GR
98	Red	SJC-☆☆-RD	SJC-☆☆-RD

Selecting SJC Couplings

A SJC-type coupling has such characterisics as cannot be seen in other couplings owing to its perculiar construction.
It means that the coupling has a complex feature that combines characteristics of a backlash-zero metal spring coupling and
those of a coupling taking advantage of a common rubber elastic body. Accordingly, a SJC-type coupling is divided
into 2 usages-one usage is the backlash-zero method adopted in order to deliver the angle of rotation and another usage is
a method adopted in order to mainly deliver torque. Because each usage has distinguished sleeves of different hardness,
please choose a proper coupling.

1. Zero Backlash Transmission

In case of using a coupling within a low torque sphere with an aim to mainly deliver the angle of rotation and effect control,
the same backlash-zero characteristic as a metal spring coupling offers can be utilized. In addition, it also has a function to
absorb a torsonal vibration that a common coupling cannot offer.
It becomes less than the torque listed in the table. Please refer to the table in the below.
Although the allowable torque usable as a backlash-zero torque is same with the 2 kinds of sleeve, a sleeve,
a sleeve of higher hardness can get the excellent performance in a use of delivering the angle of rotation correctly.

2. Torque Transmission

A SJC-type coupling can be used for higher torque than a metal coupling in that it delivers torque by way of contracting the sleeve. Accordingly, it can be applied to a geneal industrial machine such as a pump in no need of backlash-zero.
Although the SJC-coupling are standardized in different sleeves, green sleeves of lower hardness offer less usual torque
and maximum torque. While red sleeves of higher hardness offer higher usual torque and maximum torque.
Thinking conversely, however, allowable value of mis-alignment is bigger in the green sleeves and less in the red sleeves.
Please choose a proper sleeve to fit your usage.

Product No.		Sleeve Hardness	Zero Backlash Permissible Torque (N.m)	Rated Torque (N.m)	Max Torque (N.m))	Static Torsional Stiffness (N.m/rad)	Errors of Eccentricity (mm)	Errors of Angularity (°)	Errors of Shaft End-Play (mm)
SJC-14	GR	92	0.2	1.2	2.4	14	0.1	1.0	+0.6 0
SJC-14	RD	98	0.2	2	4	22	0.1	1.0	+0.6 0
SJC-20	GR	92	0.2	3	6	29	0.15	1.0	+0.8 0
SJC-20	RD	98	0.2	3	6	29	0.15	1.0	+0.8 0
SJC-25	GR	92	0.35	5	10	45	0.15	1.0	+1.0 0
SJC-25	RD	98	0.35	10	18	80	0.1	1.0	+1.0 0
SJC-30	GR	92	0.5	7.5	15	73	0.15	1.0	+1.0 0
SJC-30	RD	98	0.5	12.5	25	130	0.1	1.0	+1.0 0
SJC-40	GR	92	1.2	10	20	570	0.1	1.0	+1.2 0
SJC-40	RD	98	1.2	17	34	1200	0.1	1.0	+1.2 0
SJC-55	GR	92	-	35	70	1600	0.15	1.0	+1.4 0
SJC-55	RD	98	-	60	120	2600	0.1	1.0	+1.4 0
SJC-65	GR	92	-	95	190	3000	0.15	1.0	+1.5 0
SJC-65	RD	98	-	160	320	4900	0.1	1.0	+1.5 0
SJC-80	GR	92	-	190	380	6500	0.1	1.0	+1.5 0
SJC-80	RD	98	-	320	640	11000	0.1	1.0	+1.5 0

Product No.	A	L	W	B	C	F	M	Wrench Torque (N.m)
SJC-14 GR	14	7	22	6	1	3.5	M3	0.7
SJC-20 GR	20	10	30	8	1	5	M3	0.7
SJC-25 GR	25	10	32.5	9	1.25	5	M4	1.7
SJCA-30 GR	30	11	35	10	1.5	5.5	M4	1.7
SJCB-30 GR	30	15.8	44	10	1.5	7.7	M4	1.7
SJCA-40 GR	40	19.5	55	12	2	9	M5	4
SJCB-40 GR	40	25	66	12	2	11.5	M5	4
SJC-55 GR	55	30	78	14	2	14	M6	7
SJC-65 GR	65	35	90	15	2.5	17	M8	15
SJC-80 GR	80	45	114	18	3	22	M8	17
SJC-14 RD	14	7	22	6	1	3.5	M3	0.7
SJC-20 RD	20	10	30	8	1	5	M3	0.7
SJC-25 RD	25	10	32.5	9	1.25	5	M4	1.7
SJCA-30 RD	30	11	35	10	1.5	5.5	M4	1.7
SJCB-30 RD	30	15.8	44	10	1.5	7.7	M4	1.7
SJCA-40 RD	40	19.5	55	12	2	9	M5	4
SJCB-40 RD	40	25	66	12	2	11.5	M5	4
SJC-55 RD	55	30	78	14	2	14	M6	7
SJC-65 RD	65	35	90	15	2.5	17	M8	15
SJC-80 RD	80	45	114	18	3	22	M8	17

※ Download CAD Files

Product No.	Max Bore (mm)	Rated Torque (N.m)	Max Torque (N.m)	Max. Rotationa Frequencyl (min–1)	Moment of Inertia (kg.m²	Static Torsional Stiffness (N.m/rad)	Errors of Eccentricity (mm)	Errors of Angularity (°)	Errors of Shaft End-Play (mm)	Mass (g)
SJC-14 GR	6.35	1.2	2.4	27000	2.1X10	14	0.1	1.0	+0.6 0	7.3
SJC-20 GR	9.252	3	6	19000	1.0X10	29	0.15	1.0	+0.8 0	18
SJC-25 GR	12	5	10	15000	2.4X10	45	0.15	1.0	+1.0 0	25
SJCA-30 GR	14	7.5	15	13000	5.9X10	73	0.15	1.0	+1.0 0	46
SJCB-30 GR	14	7.5	15	13000	7.2X10	73	0.15	1.0	+1.0 0	53
SJCA-40 GR	18	10	20	9600	3.1X10	570	0.1	1.0	+1.2 0	125
SJCB-40 GR	18	10	20	9600	4.0X10	570	0.1	1.0	+1.2 0	150
SJC-55 GR	25	35	70	7000	1.7X10	1600	0.15	1.0	+1.4 0	350
SJC-65 GR	30	95	190	5900	3.9X10	3000	0.15	1.0	+1.5 0	570
SJC-80 GR	40	190	380	4500	1.1X10	6500	0.1	1.0	+1.5 0	1150
SJC-14 RD	6.35	2	4	27000	2.1X10	22	0.1	1.0	+0.6 0	7.3
SJC-20 RD	9.252	5	10	19000	1.0X10	55	0.1	1.0	+0.8 0	18
SJC-25 RD	12	9	18	15000	2.4X10	80	0.1	1.0	+1.0 0	25
SJCA-30 RD	14	7.5	15	13000	5.9X10	73	0.15	1.0	+1.0 0	46
SJCB-30 RD	14	7.5	15	13000	7.2X10	73	0.15	1.0	+1.0 0	53
SJCA-40 RD	18	10	20	9600	3.1X10	570	0.1	1.0	+1.0 0	125
SJCB-40 RD	18	10	20	9600	4.0X10	570	0.1	1.0	+1.0 0	150
SJC-55 RD	25	60	120	7000	1.7X10	2600	0.1	1.0	+1.4 0	350
SJC-65 RD	30	160	320	5900	3.9X10	4900	0.1	1.0	+1.5 0	570
SJC-80 RD	40	320	640	4500	1.1X10	11000	0.1	1.0	+1.5 0	1150

Product No.

D1 - D2

4.5

6.35

9.525

SJC-14

●

SJC-20

●

SJC-25

●

SJC-30

●

SJC-40

●

SJC-55

●

SJC-65

●

SJC-80

●

Product No.	A	L	W	B	C	F	M	Wrench Torque (N.m)
SJC-14C GR	14	7	22	6	1	3.5	M2	0.5
SJC-20C GR	20	10	30	8	1	5	M2.6	1
SJC-25C GR	25	10	32.5	9	1.25	5	M3	1.8
SJCA-30C GR	30	11	35	10	1.5	5.5	M4	2.5
SJCB-30C GR	30	15.8	44	10	1.5	5.5	M4	2.5
SJCA-40C GR	40	19.5	55	12	2	6.7	M5	4
SJCB-40C GR	40	25	66	12	2	8.5	M5	4
SJC-55C GR	55	30	78	14	2	10.5	M6	8
SJC-65C GR	65	35	90	15	2.5	13	M8	16
SJC-80C GR	80	45	114	18	3	15	M8	20
SJC-14C RD	14	7	22	6	1	3.5	M2	0.5
SJC-20C RD	20	10	30	8	1	5	M2.6	1
SJC-25C RD	25	10	32.5	9	1.25	5	M3	1.8
SJCA-30C RD	30	11	35	10	1.5	5.5	M4	2.5
SJCB-30C RD	30	15.8	44	10	1.5	5.5	M4	2.5
SJCA-40C RD	40	19.5	55	12	2	6.7	M5	4
SJCB-40C RD	40	25	66	12	2	8.5	M5	4
SJC-55C RD	55	30	78	14	2	10.5	M6	8
SJC-65C RD	65	35	90	15	2.5	13	M8	16
SJC-80C RD	80	45	114	18	3	15	M8	20