Torque Limiter

Product photo
  • The most versatile friction type overload protectors
  • ・Mounted on the shaft, capable of transmission through roller chains, belts, and gears.
  • ・If overload occurs the Torque Limiter will slip. If overload is removed it will automatically reset and begin to rotate.
  • ・Slip torque setting can be done by simply tightening the adjustment nut or adjustment bolt.
  • ・A wide range of torque settings is available with a wide range of sizes.
  • With sprocket and coupling type are also available.

Construction

Construction

During normal operations, the center member is put between the friction facings while being pressured by the disk spring. Below the set torque, the friction force transmits rotation.

During overload, if the operational torque exceeds the set torque, the center member slips between the friction facings. If overload is removed it will automatically reset and begin to rotate.

*The figure above shows the structure of TL200 to TL350. For TL500 to TL700 and TL10 to TL20, the slip torque is set by tightening the adjustment bolt. For details, refer to the operating instructions.

Package (Standard models )

Set torque range N・m Backlash Reset method
1.0~9310 No (Only for unidirectional operation.) Automatic

(Note )When the direction of rotation is reversed, it will cause backlash.

Torque Limiter with sprocket

Torque Limiter with sprocket

>>Click here for Finished bore Torque Limiter with sprockets

>>Click here for set screw, chamfer and finish.

Torque Limiter coupling

Torque Limiter coupling

>>Click here for set screw, chamfer and finish.

×
-- Package (Standard models ) -- (Drag to move. )

Package (Standard models )

・Set screw position and size

Torque Limiter Torque Limiter side Torque Limiter (Coupling type )
Set screw Set screw positioning (L1) Set screw Set screw positioning (L2)
TL200 TL200-C - - M 5× 5 8
TL250 TL250-C M 5× 8 44 M 5× 5 12
TL350 TL350-C M 6×12 56 M 6× 6 18
TL500 TL500-C M 8×20 69 M 8× 8 20
TL700 TL700-C M10×20 90 M10×10 33
TL10 TL10-C M 8× 8 10 M 8× 8 15
TL14 TL14-C M10×10 12 M10×10 20
TL20 TL20-C M14×14 15 M14×14 35

・Chamfer and finish

Shaft Bore Diameter Chamfer dimensions
Under Φ25 C0.5
Under Φ50 C1
Under Φ125 C1.5
More than Φ125 C2
Chamfer and finish
Chamfer and finish

Catalogs ・Instruction Manuals

Model No. Designation

※No-coupling type

TL250 - 2 - B6.5 - TH20JD1

Size

Number of belleville springs
1:1
2:2
1L:Weak spring

Bushing length
(Blank if there is
no bushing )

Shaft bore code

※With sprocket

TL250 - 2 - 04022 - TH20JD1 - N49

Size

Number of belleville springs

Sprocket model No.

Shaft bore code

Set torque value
N・m

※Coupling type

TL250 - 2 C - TH18JD1 X CH30JD1 - N49

Size



Coupling type

Torque Limiter 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 18 J D1
C H 30 J D1
T:Torque Limiter 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 Limiter 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 Number of springs
Spring strength
Type Bush
Sprocket
Shaft Bore Diameter Shaft bore
tolerance
Keyway
tolerance
Set screw positioning Set torque
value
 TL

Bush

Sprocket
Size
Number of teeth
Torque Limiter side
1.0

2.0
  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.
1.0~2.0 9~14 TL200-1L 10~31 TL200-1LC
2.9~9.8 TL200-1 TL200-1C
6.9~20 TL200-2 TL200-2C
2.9~6.9 12~22 TL250-1L 15~38 TL250-1LC
6.9~27 TL250-1 TL250-1C
14~54 TL250-2 TL250-2C
9.8~20 18~25 TL350-1L 15~45 TL350-1LC
20~74 TL350-1 TL350-1C
34~149 TL350-2 TL350-2C
20~49 22~42 TL500-1L 20~65 TL500-1LC
47~210 TL500-1 TL500-1C
88~420 TL500-2 TL500-2C
49~118 32~64 TL700-1L 25~90 TL700-1LC
116~569 TL700-1 TL700-1C
223~1080 TL700-2 TL700-2C
392~1270 32~72 TL10-16 35~95 TL10-16C
588~1860 TL10-24 TL10-24C
882~2660 42~100 TL14-10 40~118 TL14-10C
1960~3920 TL14-15 TL14-15C
2450~4900 52~130 TL20-6 45~150 TL20-6C
4610~9310 TL20-12 TL20-12C

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.From the machine's strength and load, as well as other information, set the trip torque at the point where it should not go any higher. This torque is the Torque Limiter slip torque.
When the limit value is not clear, calculate the rated torque by using the rpm of the shaft where the Torque Limiter is installed and rated output power of the motor. Then, multiply by 1.5 to 2.0. This is the Torque Limiter slip torque.

2.When determining the size of the torque limiter, make sure that the slip torque is within the range of the rated torque of the torque limiter.

3.Using the dimension table, verify that the maximum allowable bore diameter of the Torque Limiter is larger than the installation shaft diameter.
If the installation shaft diameter is bigger, use a Torque Limiter one size larger.

4.Depending on the thickness of the center member which is clamped, use an appropriate length of bushing (Refer to the product model number page).
Select a bush by referring to the bush length in the dimension table. Use a single bush or a combination of bushes, whichever is longest without exceeding the thickness of the center member.

Center member selection and manufacture, Torque Limiter's operation detection

Click to here for details on the selection and manufacture of sprockets to be pinched between torque limiters as center members and the overload detection method using center members.

>>Center member selection, manufacture and overload detection

When using the Torque Limiter

・Before installing a Torque Limiter rough bore product to the shaft, it is necessary to finish the bore, keyway and center member as well as torque setting.

・If the friction coefficient decreases, the slip torque also decreases. Therefore, be careful to keep the friction facings free of water and oil.
However, tightening the adjustable nut too firmly may apply excessive load to the friction facings via the disk spring and break the facings.

・Slipping at a high speed may cause the friction facings to become extremely hot, which will lead to surface carbonization and deterioration of strength. Therefore, do not use the product at speeds higher than the maximum rotation speed.

・Slip torque may decrease when used at extremely low speeds of 5 r/min or less. Contact us when using at extremely low speeds.