Mechanical protectors

It is a device that protects the equipment from overloads under abnormal conditions. It operates at the same time as an overload occurs, shutting off the drive and equipment and protecting the machine.

The line-up includes ball-type Shock Guards, in which the ball pops out of the pocket and overruns (trips) when the load rises above a set value, and friction-type Torque Limiters that slips when the load exceeds the friction force.

Unlike shear pins, which break the pin and cut off torque when the load increases and exceeds the strength of the pin, it is a mechanical element that can be automatically reset.

In addition to the above, the line-up includes Torque Keeper and Mini Keeper for slipping clutches and brakes suitable for continuous slipping.

Types of Mechanical Overload Protectors

Ball type (Shock Guard )

Power is transmitted through the ball.

When the load exceeds the set value, the ball pops out of the pocket and overruns (trips), and shutting off the power transmission.

When the overload is removed, it is automatically reset, and the repeat trip accuracy is also high.

Ball type

[Click to enlarge ]

Friction type (Torque Limiter ・Torque Keeper ・Mini Keeper )

The frictional force is used to transmit power.

When a load exceeding the frictional force is applied, it slips and shuts off the power.

If the overload is removed, it will automatically reset, but it will not be able to return to original position. It has a simpler structure and is cheaper than the ball type.

Friction type

[Click to enlarge ]

Difference from Shear-pin

In the protection method using shear pins, the load increases and exceeds the strength of the pin, the pin breaks, thus shutting off the torque.

Although it is inexpensive, automatic reset is not possible and pin replacement work is required. The set torque cannot be adjusted.

Tsubaki's mechanical overload protectors can be automatically reset in any method, reducing maintenance manpower.

The torque to shut off the power can be set steplessly, so adjusts can be made according to the equipment.

Variations of Tsubaki mechanical overload protectors


Shock Guard
TGB Series TGE Series TGF Series TGX Series TGM Series TGK Series
Compact size
(TGB08~16)
Medium size
(TGB20~70)
Large size
(TGB90~130)
With sprocket
(TGB20~70)
Torque range
[N・m]
0.3~11 9.8~1080 441~7150 9.8~1080 1.0~700 6.0~4900 1.5~784 0.6~1060 15~392
Range of Machinable Shaft Bores
[mm]
6~16 10~70 44~130 10~70 12~50 10~90 9~70 10~60 10~45
Repetitive motion
Torque accuracy
±10% ±10% ±10% ±10% ±5% ±5% ±5% ±5% ±5%
Backlash Without Low Low Low Low Minimal Without Without Minimal
Reset method Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic
Overload detection TG Sensor TG Sensor TG Sensor TG Sensor TG Sensor TG Sensor TG Sensor Limit
switch
Limit
switch
Torque indicator Yes Yes Yes Yes NO Yes Yes Yes NO ※1
Appearance Product photo Product photo Product photo Product photo Product photo Product photo Product photo Product photo Product photo

※1 Adjust the regulator pressure to adjust the torque.


Torque Limiter Torque Keeper Mini Keeper
TL TFK MK
Torque range 1.0~9310
[N・m]
0.6~650
[N・m]
1.96~39.2
[N・cm]
Range of Machinable Shaft Bores
[mm]
9~130 9~64 8・10・12
Backlash Without ※2 Without ※2 Without ※2
Reset method Automatic Automatic Automatic
Overload detection Proximity switch
Tachometer
Torque indicator NO Yes Yes
Appearance Product photo Product photo Product photo

※2 Only for unidirectional operation.

Mechanical protectors Product list

Shock Guard

High-precision separate type mechanical overload protectors using balls or cams.
General-use type, non-backlash type, sealed construction types, wide torque setting range type and air clutch structure type can be selected according to your application.

Shock Guard  TGB Series

Model No.  TGB~

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Wide range of products and versatile types with extensive applications.

  • ・A type that can be used for many applications with a wide variety of sizes, from compact, medium to large.
  • ・The set torque can be selected by color-coded springs even in the same size.
  • ・With sprocket and coupling type are also available
Set torque range

0.3~7150 N・m

Repeat working torque precision

±10%

Backlash

Low

Shock Guard  TGE Series

Model No.  TGE~

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A type that can set a wide range of torque with the same size

  • ・Both type-1 that can be installed to small diameter sprockets and wide belt sprockets, and type-3 that A type sprockets and belt sprockets can be directly mounted are applicable.
  • ・Even with the same size, the set torque can be selected depending on the number of springs.
Set torque range

1.0~700 N・m

Repeat working torque precision

±5%

Backlash

Low

Shock Guard  TGX Series

Model No.  TGX~

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High precision type thanks to its original ball and wedge construction.

  • ・Superior rigidity in normal operation without backlash.
  • ・The lost motion during trip is very small.
  • ・The set torque can be selected by color-coded springs even in the same size.
  • ・Coupling type and power lock type are also available.
Set torque range

1.5~784 N・m

Repeat working torque precision

±5%

Backlash

NO

Shock Guard  TGF Series

Model No.  TGF~

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Excellent reset position precision.

  • ・Ideal for direct mounting of an index table thanks to the excellent mounting surface accuracy of the output flange.
  • ・Even with the same size, the set torque can be selected depending on the number of springs.
  • ・Combination with Echt-Flex Coupling is available.
Set torque range

6.0~4900 N・m

Repeat working torque precision

±5%

Backlash

Minimal

Shock Guard  TGM Series

Model No.  TGM~

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Sealed type with excellent environmental resistance

  • ・It is a sealed type with pre-lubricated grease, so it will not be affected by torque accuracy due to dust, oil or water intrusion.
  • ・The cam follower and pocket's engagement is a 2 points contact pressed against each other, meaning there is no backlash.
  • ・With sprocket and coupling type are also available
Set torque range

0.6~1060 N・m

Repeat working torque precision

±5%

Backlash

NO

Shock Guard  TGK Series

Model No.  TGK~

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Multi-functional type with air clutch function

  • ・Adjusting the regulator air pressure allows you to operate the torque remotely while running.
  • ・Can also be used as an on-off clutch with remote operation.
  • ・Combination with Echt-Flex Coupling is available.
Set torque range

15~392 N・m

Repeat working torque precision

±5%

Backlash

Minimal