Product Info Mechanical protectors
Our lineup includes ball-type Shock Guards, which trip when the ball pops out of the pocket and spins freely when the load exceeds a set value; friction-type Torque Limiters, which slip when a load greater than the friction force is applied; and the Torque Keeper and Mini Keeper, slipping clutches and brakes that are suitable for continuous slippage.
Contents
Mechanical protectors Related information
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.
Once the overload is removed, it will automatically or manually reset, and it also has high repeat tripping accuracy.
[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.
[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 | TGH 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 | 32～5050 |
| Range of Machinable Shaft Bores [mm] |
6～16 | 10～70 | 44～130 | 10～70 | 12～50 | 10～90 | 9～70 | 10～60 | 10～45 | 12～125 |
| Repetitive motion Torque accuracy |
±10% | ±10% | ±10% | ±10% | ±5% | ±5% | ±5% | ±5% | ±5% | ±5% |
| Backlash | Without | Low | Low | Low | Low | Minimal | Without | Without | Minimal | Low |
| 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 indicator | Yes | Yes | Yes | Yes | NO | Yes | Yes | Yes | NO ※1 | NO |
| Appearance |  |
 |
 |
 |
 |
 |
 |
 |
 |
 |
※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 |  |
 |
 |
※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～
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～
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～
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～
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～
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～
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
Shock Guard TGH Series
Model No. TGH～
This type can be attached to a high-speed rotating shaft such as a direct motor connection, and is also compatible with high torque.
- ・The repeated trip accuracy is within ±5%.
- ・After tripping due to overload, the rotation of the drive side is not transmitted to the driven side.
- ・Coupling and pulley types can also be manufactured.
Set torque range
32～5050 N・m
Repeat working torque precision
±5%
Backlash
Low
