Torque Keeper

Product photo
  • 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.

Torque Keeper

Torque Keeper

[Click to enlarge ]

Standard brake

Standard brake

In-house ratio :Compared to our ordinary products

[Click to enlarge ]

Accurate torque repeatability

Even with high frequent repeated slippage, stable torque is transmitted consistently.

Intermittent slip

Accurate torque repeatability

[Click to enlarge ]

Longevity

Using special fine chemical fibers for the friction facings, longer life can be expected than other types of brake lining.

Longevity

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

×
-- Accumulation -- (Drag to move. )

For loading/unloading

Accumulation _(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

Accumulation _(For loading/unloading )

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.

×
-- Braking -- (Drag to move. )

Intermittent slip

Braking _(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.

×
-- Braking -- (Drag to move. )

Continual Slip

Braking _(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.

×
-- Dragging -- (Drag to move. )

For load

Dragging _(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

Dragging _(For tightening )

Tightening Machine

The bolt, nut and valve are tightened by the stable torque of the Torque Keeper.

Construction

TFK20・TFK25・TFK35

TFK20・TFK25・TFK35

[Click to enlarge ]

TFK50・TFK70

TFK50・TFK70

[Click to enlarge ]

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
Details regarding shaft bore codes
Shaft bore tolerance Shaft Bore Diameter Keyway tolerance Set screw positioning
T H 20 J D1
C H 20 J D5
T:Torque keeper side
C:Coupling side
F:F7
G:G7
H:H7
J:JS7
P:P7
M:M7
N:N7
K:K7
R:R7
Shaft bore diameters are in 1mm units. J:New JIS Js9(Standard )
P:New JIS P9
F:Old JIS F7
E:Old JIS E9

[Click to enlarge ]

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

Selected model No. :

*Select each item in order from the left to make sure a valid model number is generated.

Series Size Spring strength Type Shaft Bore Diameter Shaft bore
tolerance
Keyway
tolerance
Set screw positioning Set torque
value
 TFK

Torque keeper side
0.6

1.1
  N・m
Coupling side

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 / Position and size of set screw
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

Special Type Torque Keeper _TFK35W-2
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

Special Type Torque Keeper _TFK35LD-1
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.