Dimension Drawing
Specs/CAD
| Part Number | Bore Diameter | A | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MJS-20CS-EBL | 3≦D≦8 | 20 | 7 | 24 | 8 | 1 | 6 | 3.5 | 6.5 | M2.5 | 1 | - | 47.96 | CAD | Cart |
| Part Number | Max. Bore Diameter (mm) |
Rated Torque＊1 (N・m) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| MJS-20CS-EBL | 8 | 1.8 | 3.6 | 31000 | 8.4×10-7 | 16 | 0.2 | 1 | 0～+ 0.8 | A80 | 15 |
＊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.
| Part Number | Standard bore diameter D1-D2 | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 4.5 | 5 | 6 | 6.35 | 7 | 8 | 9.525 | 10 | 11 | 12 | 14 | 15 | 16 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 38 | |
| MJS-20CS-EBL | ● | ● | ● | ● | ● | ● | ● | ● | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
●All products are provided with hex socket head cap screw.
●Recommended dimensional allowances of applicable shaft diameter are h6 and h7.
●A set of hubs with clamping type for one side and clamping + key type for the other side is available upon request.
●In case of mounting on D-cut shaft, be careful about the position of the D-cut surface of the shaft.
●For the shaft insertion amount to the coupling, see Mounting/maintenance. ⇒Mounting and Maintenance
Additional Modification Service
Modified Part Number
Enter the desired bore diameter and then click [Check Modified Part Number].
| Standard bore diameter(D1) | Standard bore diameter(D2) | Modified Part Number | Price | Add to cart |
|---|---|---|---|---|
|
mm
in.
|
mm
in.
|
Cart |
| Applicable Bore Diameter D1D2 |
keyway | Key | |||||||
|---|---|---|---|---|---|---|---|---|---|
| b | t | Nominal Dimension b×h |
|||||||
| Standard Dimension | Allowance (JS9) |
Standard Dimension | Allowance | ||||||
| 6 | 7 | 2 | ±0.0125 | 1.0 | +0.1 0 |
2×2 | |||
| 8 | 9 | 10 | 3 | ±0.0125 | 1.4 | 3×3 | |||
| 11 | 12 | 4 | ±0.0150 | 1.8 | 4×4 | ||||
| 13 | 14 | 15 | 16 | 17 | 5 | ±0.0150 | 2.3 | 5×5 | |
| 18 | 19 | 20 | 22 | 6 | ±0.0150 | 2.8 | 6×6 | ||
| 24 | 25 | 28 | 30 | 8 | ±0.0180 | 3.3 | +0.2 0 |
8×7 | |
| 32 | 35 | 36 | 38 | 10 | ±0.0180 | 3.3 | 10×8 | ||
| 40 | 42 | 44 | 12 | ±0.0215 | 3.3 | 12×8 | |||
| 45 | 48 | 50 | 14 | ±0.0215 | 3.8 | 14×9 | |||
| 55 | 16 | ±0.0215 | 4.3 | 16×10 | |||||
| Standard Inch Bore Diameter D1D2 |
Keyway | |||
|---|---|---|---|---|
| Wk | T | |||
| Standard Dimension | Allowance | Standard Dimension | Allowance | |
| 1/2 | 1/8 | +0.002 0 |
0.560 | +0.01 0 |
| 9/16 | 1/8 | +0.002 0 |
0.623 | +0.01 0 |
| 5/8 | 3/16 | +0.002 0 |
0.709 | +0.01 0 |
| 11/16 | 3/16 | +0.002 0 |
0.773 | +0.01 0 |
| 3/4 | 3/16 | +0.002 0 |
0.837 | +0.01 0 |
| 13/16 | 3/16 | +0.002 0 |
0.900 | +0.01 0 |
| 7/8 | 3/16 | +0.002 0 |
0.964 | +0.01 0 |
| 15/16 | 1/4 | +0.002 0 |
1.051 | +0.01 0 |
| 1 | 1/4 | +0.002 0 |
1.114 | +0.01 0 |
| 1-1/8 | 1/4 | +0.002 0 |
1.241 | +0.01 0 |
| 1-1/4 | 1/4 | +0.002 0 |
1.367 | +0.01 0 |
| 1-3/8 | 5/16 | +0.002 0 |
1.518 | +0.01 0 |
| 1-1/2 | 3/8 | +0.002 0 |
1.669 | +0.01 0 |
| 1-5/8 | 3/8 | +0.002 0 |
1.796 | +0.01 0 |
| 1-3/4 | 3/8 | +0.002 0 |
1.922 | +0.01 0 |
- Refer to the "Couplicon Bore Diameter Additional Modification Service" for more information.
- BT： Additional modification of bore
- KT： Metric Keyway Modification (JIS Standard)
- KA： Inch Keyway Modification (AGMA Standard)
Material/Finish
| MJS-CS-EBL | |
|---|---|
| Hub | A2017 Anodized＊1 |
| Sleeve | Polyurethane |
| Hex Socket Head Cap Screw | SCM435 Ferrosoferric Oxide Film (Black) |
＊1： With regard to bore surface treatment, process needs may result in a mixture of parts with and without surface treatment. This will not lead to any issues in terms of coupling performance.
Structure
Clamping Type MJS-CS-BLMJS-CS-EBLMJS-CS-EGRMJS-CS-ERDMJS-CS-EWHMJS-CS-GRMJS-CS-RDMJS-CS-WH
MJS-＊＊CS-＊＊Tight FitMJS-＊＊CS-E＊＊Easy Fit
Clamping + Key Type MJS-CSK-BLMJS-CSK-EBLMJS-CSK-EGRMJS-CSK-ERDMJS-CSK-EWHMJS-CSK-GRMJS-CSK-RDMJS-CSK-WH
MJS-＊＊CSK-＊＊Tight FitMJS-＊＊CSK-E＊＊Easy Fit
Sleeve
Characteristics
- Applicable motors
| Tight Fit | Easy Fit | |
|---|---|---|
| Servomotor | ○ | ● |
| Stepping Motor | ○ | ○ |
| General-Purpose Motor | ◎ | ◎ |
- 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℃ |
- This is a jaw type flexible coupling.
- It is a short type and more compact than MJC.
- Tight Fit enables transmission with zero backlash at low torque.
- Easy fit allows assembling and separation of hubs.
- Excellent flexibility allows eccentricity, angular misalignment and twisting vibration to be accepted.
- It has electrical insulation. Resistance value: Not less than 2 MΩ
- Sleeve 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.
Selection Example
In case of selected parameters of shaft diameter of φ15 and load torque of 6 N•m, the selected size for MJS-＊＊CS-RD, MJS-＊＊CS-ERD is MJS-30CS-RD, MJS-30CS-ERD.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
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 Performance 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
As in the table below, the clamping type MJS-CS has different slip torque according to the bore diameter. Take care during selection.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 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 38 | |
| MJS-20CS | 0.8 | 1.7 | 2.2 | 2.6 | 3.5 | 3.8 | 4.4 | 5.3 | ||||||||||||||||||
| MJS-25CS | 1.9 | 2.6 | 3.4 | 4.9 | 5.4 | 6.4 | 7.9 | 10 | 11 | 8.6 | 8.9 | |||||||||||||||
| MJS-30CS | 7 | 7.6 | 8.7 | 10 | 13 | 14 | 16 | 17 | 14 | 16 | 17 | |||||||||||||||
| MJS-40CS | 28 | 35 | 37 | |||||||||||||||||||||||
| MJS-55CS | 40 | 46 | 53 | 66 | 72 | 79 | 92 | 98 | 100 | 110 | 130 | 130 | 140 | |||||||||||||
| MJS-65CS | 110 | 120 | 130 | 150 | 160 | 170 | 190 | 210 | 220 | 260 | 280 | 300 | 300 | 300 | ||||||||||||
These are test values based on the conditions of shaft dimensional allowance: h7, hardness: 34-40 HRC, and screw tightening torque of the values described in MJS-CS dimension tables. They are not guaranteed values.
Slip torque changes with usage conditions. Carry out tests under conditions similar to actual conditions in advance.
Change in static torsional stiffness due to temperature
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
