• Couplings
  • Jaw Type

MJC-55-GR-3/8-12

Flexible Coupling - Jaw-Type - Set Screw Type

Dimension Drawing

MJC-GRFlexible Coupling - Jaw-Type - Set Screw Type寸法図

MJC-GRFlexible Coupling - Jaw-Type - Set Screw Type寸法図

MJC-GRFlexible Coupling - Jaw-Type - Set Screw Type寸法図

Specs/CAD

Unit : mm

Part Number A L W B C*1 F M Wrench
Torque
(N・m)
CAD RFQ
MJC-55-GR-3/8-12 55 30 78 14 2 15 M6 7 CAD RFQ

*1: Use with C Dimension

Part Number Max. Bore Diameter
(mm)
Rated
Torque*1
(N・m)
Max.
Torque*1
(N・m)
Max.
Rotational
(min-1)
Moment
of
Inertia*2
(Kg・m2)
Static
Torsional
Stiffness
(N・m/rad)
Max. Lateral Misalignment
(mm)
Max. Angular Misalignment
(°)
Max. Axial Misalignment
(mm)
Sleeve Hardness Mass*2
(g)
MJC-55-GR-3/8-12 32 75 150 11000 1.6×10-4 9000 0.08 1 0~+ 1.4 D64 320

*1: Correction of rated torque and max. torque due to load fluctuation is not required.However, if ambient temperature exceeds 30°C, be sure to correct the rated torque and max. torque with temperature correction factor shown in the table.MJC's allowable operating temperature is -20°C to 60°C.
*2: These are values with max. bore diameter.

Structure

Set Screw Type MJC-BLMJC-WHMJC-RDMJC-GRMJC-EBLMJC-EWHMJC-ERDMJC-EGR

MJC-**-**Tight Fit
MJC-**-E**Easy Fit

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Clamping Type MJC-CS-BLMJC-CS-WHMJC-CS-RDMJC-CS-GRMJC-CS-EBLMJC-CS-EWHMJC-CS-ERDMJC-CS-EGR

MJC-**CS-**Tight Fit
MJC-**CS-E**Easy Fit

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Set Screw + Key Type MJC-K-BLMJC-K-WHMJC-K-RDMJC-K-GRMJC-K-EBLMJC-K-EWHMJC-K-ERDMJC-K-EGR

MJC-**K-**Tight Fit
MJC-**K-E**Easy Fit

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Clamping + Key Type MJC-CSK-BLMJC-CSK-WHMJC-CSK-RDMJC-CSK-GRMJC-CSK-EWHMJC-CSK-ERDMJC-CSK-EGR

MJC-**CSK-**Tight Fit
MJC-**CSK-E**Easy Fit

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Sleeve

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type


Material/Finish

MJC/MJC-CS/MJC-K/MJC-CSK
Hub A2017
Alumite Treatment
Sleeve Polyurethane
Hex Socket Set Screw SCM435
Ferrosoferric Oxide Film (Black)
Hex Socket Head Cap Screw SCM435
Ferrosoferric Oxide Film (Black)

Characteristics

  • Applicable motors
Tight Fit Easy Fit
Servomotor
Stepping Motor
General-Purpose Motor

◎: Excellent ○: Very good

  • Property
Tight Fit Easy Fit
Zero Backlash -
High Torque
Allowable Misalignment
Vibration Absorption
Electrical Insulation
Assembling
Allowable Operating
Temperature
-20℃ to 60℃ -20℃ to 60℃

◎: Excellent ○: Very good

  • This is a jaw type flexible coupling.
  • Tight Fit enables transmission with zero backlash at low torque.
  • Easy fit allows you to assemble and partition the hub and sleeve smoothly.
  • Excellent flexibility allows eccentricity, angular misalignment and twisting vibration to be accepted.
  • It has electrical insulation. Resistance value: Not less than 2 MΩ
  • There are four types of sleeve hardness. Please select desirable units according to usage conditions including torque and misalignment.
  • Sleeve Type

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type


Selection

Selection based on shaft diameter and rated torque

The area bounded by the shaft diameter and rated torque indicates is the selection size.

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Selection Example

In case of selected parameters of shaft diameter of φ15 and load torque of 6 N•m, the selected size for [MJC-**-RD, MJC-**-ERD is MJC-30-RD, MJC-30-ERD.

Selection based on the rated output of the servomotor

Rated Output
(W)
Servomotor Specifications Selection Outside Diameter Size
Diameter of Motor Shaft
(mm)
Rated Torque
(N・m)
Instantaneous Max. Torque
(N・m)
MJC-**-BL
MJC-**-EBL
MJC-**-WH
MJC-**-EWH
MJC-**-RD
MJC-**-ERD
MJC-**-GR
MJC-**-EGR
10 5-6 0.032 0.096 14 14 14 14
20 5-6 0.064 0.19 14 14 14 14
30 5-7 0.096 0.29 14 14 14 14
50 6-8 0.16 0.48 20 20 20 20
100 8 0.32 0.95 20 20 20 20
200 9-14 0.64 1.9 30 30 30 30
400 14 1.3 3.8 30 30 30 30
750 16-19 2.4 7.2 - 40 40 40

Motor specifications are based on general values.For details, see the motor manufacturer's catalogs.This is the size for cases where devices such as reduction gears are not used.

Selection Example

In case of motor specification of shaft diameter of φ9 and rated torque of 0.64 N•m, the selected size of MJC-**-BL is as follows.
Set Screw Type ----MJC-30-BL
Clamping Type ----MJC-30CS-BL
Set Screw + Key Type ----MJC-30K-BL
Clamping + Key Type ----MJC-30CSK-BL

Ambient Temperature / Temperature Correction Factor

Ambient Temperature Temperature Correction Factor
-20℃ to 30℃ 1.00
30℃ to 40℃ 0.80
40℃ to 60℃ 0.70

Sleeve Details

MJC-GRFlexible Coupling - Jaw-Type - Set Screw Type


Tight Fit

The hub and sleeve are press-fit and can be used under zero backlash*1.Since the sleeve's vibration absorption can raise the gain of a servomotor, this unit can achieve high responsive operation exceeding the Disk coupling.

*1: For the torque used under zero backlash, please refer to dimensional table.


Easy Fit

This unit allows you to easily assemble and partition the hub and sleeve. This allows you to reduce the time of assembling the unit and maintenance.It is possible to mount a hub on the shaft in advance and easily assemble the unit even in a location where the coupling is less-visible.

Slip Torque

Concerning the sizes shown in the table, please note that the shaft's slip torque is smaller than the max. torque of MJC-CS.

Unit : N・m

Part Number Bore Diameter (mm)
3 4 4.5 5 6 6.35 7 8 9.525 10 11 12 14 15 16 17 18 19 20 22 24 25 28 30 32 35 38 40 42 45 48 50 55
MJC-14CS 0.8 1.4 1.7 2.1 1.3 1.4 1.5
MJC-20CS 3.4 4.1 4.9 6.4 6.9 7.9 9.4 5.1 6 8
MJC-30CS 4 4.9 6.6 9.3 13.4 14.6 17.3 20 15.3 21.2 27.2
MJC-40CS 18 23.2 24.8 28.2 31.7 38.5
MJC-55CS 29.9 33 39.5 46 59 65.5 72 78.5 85 91.5 98 111 124 130 117 124
MJC-65CS 104 118 133 148 162 177 192 221 251 265 310 339 368 185 200
MJC-80CS 151 170 189 198 227 246 265 293 322 341 360 500
MJC-95CS 347 415 460 500 500 500 500 500 500 500 500 500

These are test values based on the condition of shaft's dimensional allowance: h7, hardness: from 34-40 HRC, and screw tightening torque of the values described in MJC-CS dimensional table.

Concerning the sizes shown in the table, please note that the shaft's slip torque is smaller than the max. torque of MJC-CS.

Unit : N・m

Part Number Bore Diameter (inch)
1/8 3/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4
MJC-14CS 0.9 1.9 1.4
MJC-20CS 4.5 6.9 9.3 5.1
MJC-30CS 4.9 9.1 13.4 17.6 7.5 17 26.4
MJC-40CS 17.7 23.2 28.6 34.1 39.5
MJC-55CS 29.9 40.2 50.5 60.8 71.1 81.5 91.8 102 112 122 133 112 123
MJC-65CS 85 108 131 155 178 201 225 248 271 318 365 184 200
MJC-80CS 96 111 126 141 157 172 187 202 232 262 292 322 353 500
MJC-95CS 249 285 320 356 428 500 500 500 500 500

These are test values based on the condition of shaft's dimensional allowance: h7, hardness: from 34-40 HRC, and screw tightening torque of the values described in MJC-CS dimensional table.


Change in static torsional stiffness due to temperature

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

This is a value under the condition where the static torsional stiffness at 20°C is 100%.
The change of torsional stiffness within the range of allowable operating temperature is as shown in the graph.
Before using the unit, be aware of the deterioration of responsiveness.

Eccentric Reaction Force

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information


Related Service

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