Product Info　Mechanical protector

Our lineup includes ball-type Shock Guard, which trip when the ball pops out of the pocket and spins freely when the load exceeds a set value; friction-type Torque Limiter, which slip when a load greater than the friction force is applied; and Torque Keeper and Mini Keeper, slipping clutches and brakes that are suitable for continuous slippage.

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Mechanical protector Related Information

Types of Mechanical protector

Ball type (Shock Guard)​​

Power is transmitted through the ball.

When the load exceeds the set value, the ball jumps out of the pocket and spins freely (trips), cutting off the power.

Once the overload is removed, it will Auto reset or manually reset, and it also has high repeat tripping accuracy.

Ball type

[Click to enlarge]

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

It transmits power using friction.

When a load greater than the frictional force is applied, the unit slips and cuts off power.

It will automatically reset once the overload is removed, but it cannot return to the exact trip position. It has a simpler structure and is less expensive than the ball type.

Friction type

[Click to enlarge]

Difference from shear pin

In shear pin protection method, if the load increases and exceeds the strength of the pin, the pin breaks and torque is cut off.

It is inexpensive, but it does not Auto reset, so you will need to replace the pin, and the set torque cannot be adjusted.

Tsubaki's Mechanical protector are capable of Auto reset in both types, reducing maintenance work.

The torque at which power is cut off can be set continuously, allowing adjustment to suit the device.

Variations of Tsubaki Mechanical protector


Shock Guard
TGB Series TGE Series TGF Series TGX Series TGM Series TGK series TGH Series
Small 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 32～5050
Shaft hole processing range
[mm]		 6～16 10～70 44～130 10～70 12～50 10～90 9～70 10～60 10～45 12～125
Repeated operation
torque accuracy		 ±10% ±10% ±10% ±10% ±5% ±5% ±5% ±5% ±5% ±5%
Backlash None Small Small Small Small Extremely small None None Extremely small Small
Reset method Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic manual
Overload Detection TG sensor TG sensor TG sensor TG sensor TG sensor TG sensor TG sensor limit
switch		 limit
switch		 TG sensor
Torque scale Yes Yes Yes Yes None Yes Yes Yes None*1 None
Exterior Product Photos Product Photos Product Photos Product Photos Product Photos Product Photos Product Photos Product Photos Product Photos Product Photos

*1 Torque can be adjusted by adjusting the regulator pressure.


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]
Shaft hole processing range
[mm]		 9～130 9～64 8・10・12
Backlash None *2 None *2 None *2
Reset method Automatic Automatic Automatic
Overload Detection proximity switch
Tachometer		 ― ―
Torque scale None Yes Yes
Exterior Product Photos Product Photos Product Photos

*2 Only when operating in one direction.

Mechanical protector Product List

Torque Limiter

The center member (sprocket/gear) is sandwiched between friction plates and pressure is applied to transmit torque by friction.
This is a traditional type in which the center member slips when a load exceeding the set torque is applied.

Torque Limiter

Model number TL～

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Product Info here

The most versatile friction type overload protective device

  • - Simple structure makes it easy to install at low cost
  • - A wide range of sizes are available, allowing for a wide range of torque settings.
  • ・Even with the same size, different torque settings can be used depending on the type and number of disc springs
  • ・Sprocket and coupling types also available
Set torque range

1.0～9310 N・m

Backlash

none
(Only when driving in one direction)