Jaw Couplings Clamping Type

Jaw couplings, also known as spider couplings, consist of two metal jaw hubs and one elastomer resin spider.
The res in spider helps absorb the impact of inertial loads during start and stop operations. Easy to assemble and disassemble.
Applicable motor types: Recommended for use with stepper motors and general-purpose motors.

Keyway specifications require selecting additional machining parameters LK/RK
E-LMPJC
Outer diameter ⌀35–⌀40

Outer diameter ⌀55-⌀120

Be sure to use a torque wrench to tighten the bolts according to the specified tightening torque in the specification table to avoid thread stripping caused by excessive force. Keyway specifications require selecting additional machining parameters LK/RK

· Material Table

Part	Material	Surface treatment	Accessories
Hub	Aluminum alloy	Anodized finish	Hex socket bolt
Adjustment ring	Polyurethane	—

 

Please follow the selection steps to , choose the type and parameters, and then place your order.

Type (Type·DL)	—	d1	—	d2
E-LMPJC20L30 E-LMPJC30L35	— —	7 7	— —	8 9

 

Type			d1 and d2 selection (but d1 ≤ d2)																LF	B	C	F	Inner bore ⌀d	Locking bolt (M)	G
Type	D	L
E-LMPJC (adjustment ring red) E-LMPJY (adjustment ring yellow) E-LMPJB (Adjustment ring blue)	14	L22	3	4	5	6	6.35												7.5	6.2	0.4	3.75	⌀3–⌀4	2.5	4
																							⌀5–⌀6.35	2	4.5
	20	L30	3	4	5	6	6.35	7	8	9	9.525	10							10.3	8	0.7	5.10	⌀3-⌀8	3	6.3
																							⌀9-⌀10	2.5	7
	25	L30	5	6	6.35	7	8	9	9.525	10	11	12	12.7	13	14				8.85	10.3	1	4.40	⌀5-⌀10	4	8
																							⌀11-⌀14	3	9.5
	25	L34	5	6	6.35	7	8	9	9.525	10	11	12	12.7	13	14				10.85	10.3	1	5.40	⌀5-⌀10	4	8
																							⌀11-⌀14	3	9.5
	30	L35	5	6	6.35	7	8	9	9.525	10	11	12	12.7	13	14	15	16		11.7	10	0.8	5.80	⌀5-⌀14	4	9.7
																							⌀15-⌀16	3	10.5
	35	L50	8	9	9.525	10	11	12	12.7	13	14	15	16	17	18	19	20		19.35	9.3	1	9.70	⌀8-⌀18	4	12
																							⌀19-⌀20	3	13
	40	L55	8	9	9.525	10	11	12	12.7	13	14	15	16	17	18	19	20	22	20.6	10.8	1.5	10.30	⌀8-19	5	13
																							⌀20-⌀22	4	14.8
	40	L66	8	9	9.525	10	11	12	12.7	13	14	15	16	17	18	19	20	22	26.1	10.8	1.5	7.50	⌀8-19	5	13
																							⌀20-⌀22	4	14.8
	55	L78	12	12.7	13	14	15	16	17	18	19	20	22	24	25	28	30		30.8	13.9	1.3	9.50	⌀12-⌀30	6	20
	65	L90	14	15	16	17	18	19	20	22	24	25	28	30	32	35	38		36	15	1.5	12	⌀14-⌀35	8	23.5
																							⌀38	6	25
	80	L114	19	20	22	24	25	28	30	32	35	38	40	42	45				45.75	18.5	2	15	⌀19-⌀45	8	29
	95	L126	20	22	24	25	28	30	32	35	38	40	42	45	50	55			51.3	20.4	1.5	15.50	⌀20-⌀50	10	34
																							⌀55	10	35
	105	L140	20	22	24	25	28	30	32	35	38	40	42	45	50	55	60		57.3	20.4	2.5	17.50	⌀20-⌀60	10	38

Please adjust the shaft insertion amount according to the "LF" dimensions in the catalog.
The red adjustment ring in the center of the standard product is solid.

■ Characteristics

Type			Rated torque (N⋅m)			Allowable angular misalignment (°)	Allowable eccentricity (mm)			Static torsional stiffness (N⋅m/rad)			Maximum speed (r/min)	Moment of inertia (kg·m2)	Allowable axial amplitude (mm)	Locking torque (N⋅m)	Weight g
Type	D	L	E-LMPJC	E-LMPJY	E-LMPJB		E-LMPJC	E-LMPJY	E-LMPJB	E-LMPJC	E-LMPJY	E-LMPJB
E-LMPJC (adjustment ring red) E-LMPJY (adjustment ring yellow) E-LMPJB (Adjustment ring blue)
	14	L22	1.1	0.7	0.4	1	0.02	0.03	0.04	46	28	17	19000	2.0 × 10-7	±0.6	11	10
	20	L30	2.8	1.7	1	1	0.02	0.03	0.04	55	33	20	17000	1.1 × 10-6	±0.6	3.5	19
	25	L30	6	3.6	2.1	1	0.02	0.03	0.04	65	39	24	16000	5.2 × 10-6	±0.6	3.5	33
	25	L34				1	0.02	0.03	0.04	65	39	24	16000	5.2 × 10-6	±0.6	3.5	42
	30	L35	6.5	3.9	2.3	1	0.02	0.03	0.04	72	43	26	12000	6.2 × 10-6	±0.6	3.5	50
	35	L50	15	9	5.3	1	0.02	0.03	0.04	200	120	72	10000	8.1 × 10-6	±0.6	8	45
	40	L55	32	19	11	1	0.02	0.03	0.04	500	300	180	10000	3.8 × 10-5	±0.8	8	127
	40	L66				1	0.02	0.03	0.04	550	330	198	10000	3.9 × 10-5	±0.8		154
	55	L78	46	28	16	1	0.02	0.03	0.04	1500	900	540	8000	1.6 × 10-3	±0.8	13	341
	65	L90	109	66	38	1	0.02	0.03	0.04	2800	1680	1008	6000	2.5 × 10-3	±0.8	28	583
	80	L114	135	81	47	1	0.02	0.03	0.04	3500	2100	1260	4600	2.8 × 10-3	±1.0	28	1000
	95	L126	250	150	88	1	0.02	0.03	0.04	5000	3000	1800	3800	3.0 × 10-3	±1.0	40	1500
	105	L140	420	252	147	1	0.02	0.03	0.04	5400	3240	1944	3400	3.2 × 10-3	±1.0	75	2000

Allowable torque varies with temperature.

Additional machining - keyway

The features of jaw couplings are as follows:
Simple structure, no lubrication required, easy maintenance, convenient inspection, maintenance-free, and capable of continuous long-term operation.
Polyurethane elastomer components are wear-resistant and oil-resistant, have high load capacity, long service life, and are safe and reliable.
Provides excellent vibration damping, cushioning, and electrical insulation performance. Offers large axial, radial, and angular compensation capabilities.
Simple structure, small radial dimensions, lightweight, low moment of inertia, suitable for medium and high-speed applications.

■ Installation method
STEP1 Insert the coupling
Make sure the clamping bolts are loosened, then remove any dust, foreign matter, or oil from the shaft and the coupling bore.
Next, when inserting the coupling onto the shaft, be careful not to subject the diaphragm to excessive stress such as compression or tension.
STEP2 Adjustment using a jig
Please use a jig to precisely adjust and secure the concentricity of the left and right hubs of the coupling.
STEP3 Simple eccentricity and angular misalignment check
With the bolts loosened, slide the coupling axially to confirm smooth operation.
Next, rotate the coupling and make sure it operates smoothly.
Eccentricity is not allowed for single-disc couplings, so please position them accurately.

STEP4 Installation
Adjust the shaft insertion amount according to the ℓ dimension in the product catalog, and use a torque wrench to tighten to the specified torque.
*If the specified torque cannot be reached in one tightening, please tighten the left and right clamps in a crisscross pattern over 2 or 3 rounds.

■ Alignment Adjustment
1. Couplings allow for shaft misalignment, transmission of rotational angle, and torque, but if the shaft misalignment exceeds the allowable value, vibration may occur or the service life may be drastically reduced. Be sure to perform alignment adjustment.
2. Shaft misalignment includes eccentricity (parallel error between two shaft centers), angular misalignment (angular error between two shaft centers), and axial displacement (axial movement of the shaft).
Please calibrate and adjust the shafts to ensure that the shaft misalignment is within the allowable values specified in the dimensions and performance tables of each product.
3. The allowable values for shaft misalignment listed in the dimensions and performance tables refer to the case where only one of eccentricity, angular misalignment, or axial displacement occurs individually. When two or more types of shaft misalignment occur simultaneously, the corresponding allowable values should each be halved.
4. Shaft misalignment does not only occur during assembly to the equipment; vibration during operation, thermal expansion, and bearing wear are also major causes. Therefore, it is recommended to set the shaft misalignment to less than one-third of the allowable value.