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.
table of contents
Mechanical protector Related Information
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Selection
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Materials
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Operation
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.
[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.
[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) |
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| 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 |  |
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*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 |  |
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*2 Only when operating in one direction.
Mechanical protector Product List
Shock Guard
A high-precision, separate type Mechanical protector that uses a ball or cam.
You can choose from a variety of types to suit your application, including general-purpose types, non-backlash types, sealed types, wide-range torque setting types, and air clutch structure types.
Shock Guard TGB Series
Model number TGB～
A versatile type with a wide range of products and applications
- - A wide range of sizes available, including small, medium and large, making it suitable for many applications.
- ・Color-coded springs allow different torque settings even for the same size
- ・Sprocket and coupling types also available
Set torque range
0.3～7150 N・m
Repeated operating torque accuracy
±10%
Backlash
Small
Shock Guard TGE Series
Model number TGE~
A type that allows for a wide range of torque settings with the same size
- - You can choose between Type 1, which can be fitted with small diameter sprockets and wide pulleys, and Type 3, which can be fitted directly with A-type sprockets and pulleys.
- ・Even with the same size, different torque settings can be used depending on the number of springs
Set torque range
1.0～700 N・m
Repeated operating torque accuracy
±5%
Backlash
Small
Shock Guard TGX Series
Model number TGX～
High-precision type with original ball-and-wedge mechanism
- ・No backlash and excellent rigidity under normal conditions
- ・Lost motion during tripping is extremely small
- ・Color-coded springs allow different torque settings even for the same size
- ・Coupling type and Power-Lock type are also available
Set torque range
1.5～784 N・m
Repeated operating torque accuracy
±5%
Backlash
None
Shock Guard TGF Series
Model number TGF~
Highly accurate return position type
- ・The output flange has high mounting surface precision, making it ideal for directly mounting an index table.
- ・Even with the same size, different torque settings can be used depending on the number of springs
- ・Available in combination with ECHT-FLEX couplings
Set torque range
6.0～4900 N・m
Repeated operating torque accuracy
±5%
Backlash
Extremely small
Shock Guard TGM Series
Model number TGM~
Sealed type with excellent environmental resistance
- - It is a sealed type with grease sealed inside, so torque accuracy is not affected by the intrusion of dust, oil, water, etc.
- - The cam follower and pocket are pressed together at two points of contact, so there is no backlash.
- ・Sprocket and coupling types also available
Set torque range
0.6～1060 N・m
Repeated operating torque accuracy
±5%
Backlash
None
Shock Guard TGK Series
Model number TGK~
Multifunctional type with air clutch function
- ・By adjusting the air pressure of the regulator, torque can be remotely controlled during operation.
- ・Can also be used as an ON-OFF clutch via remote control
- ・Available in combination with ECHT-FLEX couplings
Set torque range
15～392 N・m
Repeated operating torque accuracy
±5%
Backlash
Extremely small
Shock Guard TGH Series
Model number 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.
- - Repeated operating torque accuracy is within ±5%
- ・After tripping due to overload, the rotation of the drive side is not transmitted to the driven side.
- ・Coupling type and pulley type can also be manufactured
Set torque range
32～5050 N・m
Repeated operating torque accuracy
±5%
Backlash
Small
