Torque Keeper
- Tsubaki's original slipping clutch & brake
- ・Using special fine chemical fibers for the friction facings, longer life can be expected.
- ・Smoothly transmits slipping torque due to the small torque fluctuations.
- ・Even with high-frequency, repeated slipping torque, stable torque is transmitted consistently.
- ・Coupling type is also available.
Features
Stable slip torque
Torque fluctuation is very small, so stable torque can be transmitted.
Accurate torque repeatability
Even with high frequent repeated slippage, stable torque is transmitted consistently.
Longevity
Using special fine chemical fibers for the friction facings, longer life can be expected than other types of brake lining.
Applicable use
Accumulation
For stopping at correct position due to stable slipping feature of the Torque Keeper.
Applications
Braking
・Intermittent slip
Due to repetition of slipping and connecting, driven side is held with stable torque.
Applications
・Continual Slip
Braking unit for various types of machines driven continuously.
Applications
Dragging
The Torque Keeper can apply stable load to the machine.
Applications
For loading/unloading
Chain Conveyor
When the stop bar contacts the stopper, the Torque Keeper slips and the conveyor stops.
When the stopper is unset, the Torque Keeper connects and the conveyor resumes operation.
For intermittent slip
Roller conveyor
When the roller chain is moving, if the material contacts the stopper, the nearby Torque Keeper slips and the material will be stopped.
After releasing the stopper, the Torque Keeper will be connected and the material will continue moving.
Intermittent slip
Turn table for parking system
At the parking station the car is rotated in the exit direction on the turn table.
When the turn table comes to the correct position, it will be stopped by the stopper.
The slipping of the Torque Keeper protects the drive unit from damage.
Continual Slip
Winding of film, paper or sandpaper
The gear motor winds the film, paper or sand paper through the Torque Keeper. In this case, the Torque Keeper is slipping under low rpm, so it can apply stable tension.
For load
Wrist Exerciser
The wrist can be exercised by the rotating roller.
The Torque Keeper applies the load to the roller through the stable slipping torque.
For tightening
Tightening Machine
The bolt, nut and valve are tightened by the stable torque of the Torque Keeper.
Construction
Package (Standard models )
Set torque range N・m | Backlash | Reset method |
---|---|---|
0.6~650 | No (Only for unidirectional operation.) | Automatic |
(Note ) When the direction of rotation is reversed, it will cause backlash.
Catalogs ・Instruction Manuals
Model No. Designation
※No-coupling type
TFK35 | - | 1 | - | TH20JD1 | - | N25 |
| Size |
| Number of belleville springs 1:1 2:2 1L:Weak spring |
| Shaft bore code |
| Set torque value N・m |
※Coupling type
TFK25 | - | 1 | C | - | TH20JD1 | X | CH20JD5 | - | N16 |
| Size |
| | | |
| Coupling type |
| Torque keeper side Shaft bore code |
| Coupling side Shaft bore code |
| Set torque value N・m |
||||
| Number of belleville springs |
Note) The set screw position of the Torque Keeper side is as seen from the adjustment nut side, and the set screw position of the coupling side is as seen from the hub side.
■Tsubaki model No. navigation
List of Model Numbers
※Click the model No. for detailed information.
Set torque range N・m |
No-coupling type | Coupling type | ||
---|---|---|---|---|
Range of Shaft Bore Diameters mm |
Model No. | Bore Diameter Range on Coupling Side mm |
Model No. | |
0.6~1.1 | 9~14 | TFK20-1L | 10~26 | TFK20-1LC |
1.8~5.8 | TFK20-1 | TFK20-1C | ||
4.0~11 | TFK20-2 | TFK20-2C | ||
1.8~4.1 | 12~22 | TFK25-1L | 13~29 | TFK25-1LC |
4.0~16 | TFK25-1 | TFK25-1C | ||
7.9~32 | TFK25-2 | TFK25-2C | ||
5.9~11 | 19~25 | TFK35-1L | 15~35 | TFK35-1LC |
12~44 | TFK35-1 | TFK35-1C | ||
21~89 | TFK35-2 | TFK35-2C | ||
12~29 | 22~42 | TFK50-1L | 20~47 | TFK50-1LC |
29~125 | TFK50-1 | TFK50-1C | ||
53~252 | TFK50-2 | TFK50-2C | ||
30~70 | 32~64 | TFK70-1L | 21~63 | TFK70-1LC |
70~341 | TFK70-1 | TFK70-1C | ||
134~650 | TFK70-2 | TFK70-2C |
Selection
If using the Torque Limiter with human transportation or lifting devices, take the necessary precautions with equipment to avoid serious injury or death from falling objects.
1.Decide the operating conditions from the table below in accordance with the application above. Determine the size from the T-N curve graphs. >>Click here for TN curve graphs.
Applicable use | Usage conditions | Determine a size |
---|---|---|
Accumulation |
Determine the following for the Torque Keeper of each conveyor. 1.Slip torque 2.Slip rpm 3.Slip time (conveyor stop time) 4.Connection time (conveyor drive time) 5.Operating time per day |
Determine a size for which the slip torque and rpm is within the allowable range (below the curve) on the T-N curve graph. When the slip time is longer than the connection time, and the operating time per day exceeds eight hours, we recommend that it be operated within the IIIIIII area of the T-N curve graph. |
Braking |
Determine the following for the Torque Keeper of each machine. 1.Brake torque 2.Speed 3.Slip time (brake operating time) 4.Connection time (time when brake not operated) 5.Operating time per day Items ③ and ④ are not necessary in case of continual slipping. |
Determine a size for which the brake torque and rpm is within the allowable range (below the curve) on the T-N curve graph. When the slip time is longer than the connection time, and the operating time per day exceeds eight hours, we recommend that it be operated within the IIIIIII area of the T-N curve graph. |
Dragging |
Determine the following for the Torque Keeper of each machine. 1.Slip torque 2.Slip rpm 3.Slip time 4.Connection time 5.Operating time per day |
Determine a size for which the slip torque and rpm is within the allowable range (below the curve) on the T-N curve graph. When the slip time is longer than the connection time, and the operating time per day exceeds eight hours, we recommend that it be operated within the IIIIIII area of the T-N curve graph. |
2.Verify that the shaft bore range of the chosen Torque Keeper conforms with the shaft diameter to beinstalled.
3.Setting the slip torque (See the instruction manual for more information. )
Verify that the shaft bore range of the chosen Torque Keeper conforms with the shaft diameter to beinstalled.
1.Do not allow water or oil to get onto the friction surface. This will cause the torque to drop and unstable slip torque will result.
2.The T-N curve graph is intended for use when the ambient temperature is below 40℃ . Please contact Tsubaki representatives when the ambient temperature is higher than this.
3.Please contact Tsubaki representatives when the slip torque for the shaft diameter to be used is smaller than the setting torque range of theTorque Keeper.
4.Reversing the direction of rotation will cause backlash. Torque Keeper cannot be used with machines that do not allow backlash.
Drive menber manufacture/ chamfer, finish, set screw
Drive menber manufacture
Refer to the product model number page for the recommended machining dimensions of drive members such as sprockets.
Refer to the table below for the minimum number of sprocket teeth when installing the sprocket as a drive member.
Model No. | Sprocket used. | ||||||
---|---|---|---|---|---|---|---|
RS35 | RS40 | RS50 | RS60 | RS80 | RS100 | RS120 | |
TFK20 | 32 | 25 | |||||
TFK25 | 35 | 28 | 23 | 20 | 16 | ||
TFK35 | △33 (34) |
28 | 24 | 19 | 16 | 14 | |
TFK50 | 45 | △37 (38) |
△31 (32) |
24 | 20 | 18 | |
TFK70 | △47 (48) |
△39 (40) |
△31 (32) |
25 | 22 |
- Note 1 ) The roller chain which does not require lubricating oil is recommended.
- Note 2 ) △ denotes non-standard A-type sprocket. In case of using standard sprockets, please use the sprocket teeth in ( ).
Chamfer and finish / Position and size of set screw
Chamfer and finish
Shaft Bore Diameter | Chamfer dimensions |
---|---|
Under Φ25 | C0.5 |
Under Φ50 | C1 |
Under Φ125 | C1.5 |
More than Φ125 | C2 |
Shaft bore diameter and keyway specifications
- ・Shaft bore diameter tolerance is H7.
- ・The keyway is new JIS (JIS B 1301-1996) "normal type."
- ・Set screws come delivered with the product.
Units :㎜
トルクキーパー形番 | トルクキーパー側 |
Coupling side (Coupling type only. ) |
|||
---|---|---|---|---|---|
Set screw | Set screw positioning (L1) *Note 1 | Set screw | Set screw positioning (L2) *Note 2 | ||
TFK20 | TFK20-C | M5 X 8 | 32 | M5 X 5 | 10.5 |
TFK25 | TFK25-C | M5 X 8 | 42 | M6 X 8 | 10.5 |
TFK35 | TFK35-C | M6 X 12 | 55 | M6 X 8 | 13.5 |
TFK50 | TFK50-C | M8 X 20 | 69 | M8 X 12 | 20.5 |
TFK70 | TFK70-C | M10 X 20 | 88 | M8 X 12 | 20.5 |
*Note 1 ) L1 is the distance from the end face of the Torque Keeper body to the center of the set screw.
*Note 2 ) L2 is the distance from the end face of the coupling to the center of the set screw.
Special Type Torque Keeper
Contact us for more information on the special type.
Multiple disc type Torque Keeper
Model No. | TFK35W-2 |
---|---|
Package | Shaft diameter :Φ25 Set torque range :45~196N・m{4.6~20kgf・m} |
Built-in Cam Clutch type Torque Keeper
Model No. | TFK35LD-1 |
---|---|
Package | Maximum Shaft Bore Diameter :Φ25 Set torque range :11~43N・m{1.1kgf・m~4.4kgf・m} |
Main purpose(s) | Machines in which it is necessary to loosen bolts, nuts, or valves, etc., after tightening them with a fixed torque. |