Dimension Drawing
Specs/CAD
Unit : mm
| Part Number | Slip Torque | Max. Bore Diameter (mm) |
Rated Torque＊1 (N・m) |
Max. Torque (N·m) *1 |
Max. Rotational Frequency (min-1) |
Moment of Inertia (kg・m2)＊2 |
Static Torsional Stiffness (N･m/rad) |
Max. Lateral Misalignment (mm) |
Max. Angular Misalignment (°) |
Max. Axial Misalignment (mm) |
Sleeve Hardness | Mass (g) ＊2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MJB-40-EWH-10-20 | - | 20 | 10 | 20 | 23000 | 8.6×10-5 | 570 | 0.1 | 1 | 0～+1.2 | A92 | 400 |
＊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 following table.
The allowable operating temperature of MJB is -20°C to 60℃.
※ The shaft's slip torque may be smaller than the coupling's rated torque depending on the shaft bore. MJB-BLMJB-GRMJB-RDMJB-WHMJB-EBLMJB-EGRMJB-ERD
＊2： These are values with max. bore diameter.
Material/Finish
| MJB | |
|---|---|
| Hub | S45C Ferrosoferric Oxide Film (Black) |
| Outer Ring | S45C Ferrosoferric Oxide Film (Black) |
| Sleeve | Polyurethane |
| Hex Socket Head Cap Screw | SCM435 Ferrosoferric Oxide Film (Black) |
Characteristics
- Recommended Applicable Motor
| Tight Fit | Easy Fit | |
|---|---|---|
| Servomotor | ○ | ● |
| Stepping Motor | ○ | ○ |
| General-purpose Motor | ◎ | ◎ |
- Property
| Tight Fit | Easy Fit | |
|---|---|---|
| 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.
- Excellent for high torque transmission and ideal for machine tool spindles.
- Excellent flexibility. 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.
- Since the sleeve's vibration absorption of Tight Fit can raise the gain of a servomotor, this unit can achieve high responsive operation exceeding the Disk coupling.
-
Easy fit allows you to assemble and partition the hub and sleeve smoothly.
This allows you to reduce the time of assembling the unit and maintenance.
- Sleeve Type
Application
Machine tool / SpindleSelection
Selection Based on Shaft Diameter and Rated Torque
The area bounded by the shaft diameter and rated torque indicates the selection size.
Selection Example
In case of selected parameters of shaft diameter of φ 18 and load torque of 16 N•m, the selection size forMJB-＊＊-BLMJB-＊＊-EBLis MJB-55-BLMJB-55-EBLAmbient 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
Slip torque
As in the table below, the bushing type MJB has different slip torque according to the bore diameter. Take care during selection.Unit : N・m
| Part Number | Bore Diameter (mm) | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 11 | 12 | 14 | 15 | 16 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 38 | 40 | 42 | 45 | 48 | 50 | |
| MJB-55 | 32 | 54 | 75 | 110 | 130 | |||||||||||||||||
| MJB-65 | 160 | 170 | 180 | 200 | 210 | 220 | 240 | 260 | 270 | 300 | 320 | 340 | 370 | |||||||||
| MJB-80 | 280 | 330 | 380 | 410 | 480 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | ||||||||||
| MJB-95 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | |||||||||||
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 MJB 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
Changes in the static torsion spring constant within the operating temperature are shown in the graph.
Before using the unit, be aware of the deterioration of responsiveness.
Eccentric Reaction Force
