XBSS-C
Flexible Coupling – Single – Disk Type
Dimension Drawing
Dimensions/Specifications/CAD
| Part Number | A | L | W | F | G | M | Wrench Torque (N･m) |
|---|---|---|---|---|---|---|---|
| XBSS-15C2 | 15 | 7.5 | 16 | 2.3 | 5.25 | M2 | 0.5 |
| XBSS-19C2 | 19 | 9 | 19 | 2.5 | 7.1 | M2 | 0.5 |
| XBSS-25C2 | 25 | 11 | 23.6 | 3.5 | 9.25 | M2.5 | 1 |
| XBSS-27C2 | 27 | 11 | 23.6 | 3.5 | 10.25 | M2.5 | 1 |
| XBSS-34C3 | 34 | 12 | 26.2 | 4 | 13 | M3 | 1.5 |
| XBSS-39C2 | 39 | 15 | 32.8 | 5 | 14.5 | M4 | 3.5 |
| XBSS-44C2 | 44 | 15 | 32.8 | 5 | 17 | M4 | 3.5 |
| XBSS-56C3 | 56 | 20 | 43.2 | 6 | 21.25 | M5 | 8 |
| Part Number | Max. Bore Diameter (mm) | Rated Torque* (N・m) | Max. Torque* (N・m) | Max. Rotational (min-1) | Static Torsional Stiffness (N・m/rad) | Max. Lateral Misalignment (mm) | Max. Axial Misalignment (mm) | Mass** (g) |
|---|---|---|---|---|---|---|---|---|
| XBSS-15C2 | 6 | 0.5 | 1 | 42000 | 500 | 0.5 | ±0.1 | 15 |
| XBSS-19C2 | 8 | 1 | 2 | 33000 | 1000 | 1 | ±0.1 | 29 |
| XBSS-25C2 | 12 | 1.2 | 2.4 | 25000 | 1500 | 1 | ±0.2 | 53 |
| XBSS-27C2 | 14 | 1.5 | 3 | 23000 | 2100 | 1 | ±0.2 | 67 |
| XBSS-34C3 | 16 | 3.5 | 7 | 18000 | 3800 | 1 | ±0.3 | 115 |
| XBSS-39C2 | 20 | 5 | 10 | 16000 | 5500 | 1 | ±0.3 | 185 |
| XBSS-44C2 | 22 | 7 | 14 | 14000 | 7000 | 1 | ±0.3 | 305 |
| XBSS-56C3 | 28 | 15 | 30 | 11000 | 15000 | 1 | ±0.4 | 610 |
*Adjustment of rated and max. torque specifications for load fluctuations is not required.
For more detailed information, please refer to Selection Guidelines [PDF 171KB].
**Based on the max. shaft bores.
| Part Number | Stock Bores D1-D2 | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 5 | 6 | 8 | 10 | 11 | 12 | 14 | 15 | 16 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | ||||||||||
| XBS-15C2 | ● | ● | ● | ● | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||||||
| XBSS-15C2 | ● | ● | ● | ● | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||||||
| XBSS-19C2 | – | ● | ● | ● | ● | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||||||
| XBSS-25C2 | – | – | ● | ● | ● | ● | ● | ● | – | – | – | – | – | – | – | – | – | – | |||||||||
| XBSS-27C2 | – | – | – | ● | ● | ● | ● | ● | ● | – | – | – | – | – | – | – | – | – | |||||||||
| XBSS-34C3 | – | – | – | ● | ● | ● | ● | ● | ● | ● | ● | – | – | – | – | – | – | – | |||||||||
| XBSS-39C2 | – | – | – | – | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | – | – | – | – | |||||||||
| XBSS-44C2 | – | – | – | – | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | – | – | – | |||||||||
| XBSS-56C3 | – | – | – | – | – | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | |||||||||
●All products come with set screws.
●Recommended tolerance for shaft diameters is h6 and h7.
●Bore and keyway modifications are available on request. Please take advantage of our bore modification services.
For more information please refer to Custom Bore Modifications [PDF 495KB]
Material/Finish
| XBS-C | XBSS-C | |
|---|---|---|
| Hub | A7075＊ | SUS303 |
| Bolt | SCM435 Ferrosoferric oxide film | YUS-550 |
| Disk | SUS304 | SUS304 |
| Collar | SUS304 | SUS304 |
| Hex Socket Head Cap Screw | SCM435 Ferrosoferric oxide film | SUSXM7 |
＊Manufacturing alumite treatment products is also possible. Please feel free to contact our customer service.
Structure
Clamping ｔypeXBS-C,XBSS-C
XBS-CAluminum alloy hub
XBSS-CMade of all stainless steel
Characteristics
- Applicable motors
XBS XBSS Servomotor ◎ ◎ Stepping motor ◎ ◎ General-purpose motor ◎ ◎ ◎：Excellent ○：Very good
- Property
XBS XBSS Zero Backlash ◎ ◎ High Torque ○ ○ High Torsional Stiffness ◎ ◎ Allowable Misalignment ○ ○ Corrosion Resistance（All S.S.） – ◎ ◎：Excellent ○：Very good
- This is a disk type flexible coupling.
- It has compact design with short entire length.
- The stainless steel disk allows the eccentricity, angular misalignment and end-play.
- Wide variation of outside diameter φ 15 – φ 104 and bore diameter φ 3 – φ 50.
- Extra super duralumin (A7075) featuring the highest strength among aluminum alloy is adopted for XBS hubs.
- XBSS is the all stainless steel type with stainless steel hubs.
Application
Actuator / Surface-mount machine / High precision XY stage /
Index table
Selection
Selection example
In case of selected parameters of shaft diameter of φ30 and load torque of 40 N•m, the selected size is XBS-68C5
| Rated output （W） | Servomotor specifications＊ | Selection size | |||
|---|---|---|---|---|---|
| Diameter of motor shaft （mm） | Rated torque （N・m） | Instantaneous max. torque（N・m） | XBW-C | XBWS-C | |
| Aluminum alloy hub | Made of all stainless steel | ||||
| 10 | 5-6 | 0.032 | 0.096 | XBS-15C | XBSS-15C |
| 20 | 5-6 | 0.064 | 0.19 | XBS-15C | XBSS-15C |
| 30 | 5-7 | 0.096 | 0.29 | XBS-19C | XBSS-19C |
| 50 | 6-8 | 0.16 | 0.48 | XBS-19C | XBSS-19C |
| 100 | 8 | 0.32 | 0.95 | XBS-19C | XBSS-19C |
| 200 | 9-14 | 0.64 | 1.9 | XBS-27C | XBSS-34C |
| 400 | 14 | 1.3 | 3.8 | XBS-34C | XBSS-39C |
| 750 | 16-19 | 2.4 | 7.2 | XBS-39C | XBSS-56C |
＊Motor specifications are based on general values. For details, please refer to catalogs of each motor manufacturers. Recommended sizes are for the cases where reduction gears are not used.
Thrust Reaction Force
Slip Torque
Concerning the sizes shown in the following table, please note that the shaft’s slip torque is smaller than the max. torque of XBS-C,XBSS-C
| Part Number | Bore Diameter（mm） | |||||||
|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 6 | 8 | 10 | 11 | 14 | 15 | |
| XBS-15C2 | 1 | |||||||
| XBS-19C2 | 1.6 | |||||||
| XBS-34C3 | 5.2 | 6 | ||||||
| XBS-44C2 | 15 | |||||||
| XBS-56C3 | 25 | 32 | ||||||
| XBS-68C5 | 80 | 100 | ||||||
These are test values based on the condition of shaft’s dimensional allowance: h7, hardness: 34 – 40 HRC, and screw tightening torque of the values described in XBS-C,XBSS-C Dimension table.
| Part Number | Bore Diameter（mm） | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 6 | 8 | 10 | 11 | 12 | 14 | 15 | |
| XBSS-15C2 | 1 | ||||||||
| XBSS-19C2 | 1 | ||||||||
| XBSS-34C3 | 5 | 6 | |||||||
| XBSS-39C2 | 5.5 | 8 | |||||||
| XBSS-44C2 | 4.5 | 6 | 10 | ||||||
| XBSS-56C3 | 9 | 13 | 18 | 25 | 28 | ||||
Change in static torsional stiffness due to temperature
This is a value under the condition where the static torsional stiffness at 20°C is 100%.
The change of XBSXBSS in torsional stiffness due to temperature is small and the change in responsiveness is extremely small. However, if the unit is used at higher temperature, be careful about misalignment due to elongation or deflection of the shaft associated with thermal expansion.
Static torsional stiffness comparison (double disc-type)
Eccentric Reaction Force
