Product Info 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.
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.
When the overload is removed, it is automatically reset, and the repeat trip accuracy is also high.
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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 | ||||
| Compact 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 |
| 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 |  |
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※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 |  |
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※2 Only for unidirectional operation.
Mechanical protectors Product list
Torque Limiter
The center member (sprocket/gear) is pinched by friction facings and pressurized to transmit torque by frictional force.
This is a traditional type in which the center member slips when a load exceeding the set torque is applied.
Torque Limiter
Model No. TL～
The most versatile friction type overload protectors
- ・Low cost and easy installation thanks to simple structure.
- ・Wide range of torque settings available with a wide range of sizes
- ・Even with the same size, the set torque can be selected according to the type and quantity of disc springs.
- ・With sprocket and coupling type are also available
Set torque range
1.0～9310 N・m
Backlash
NO
(Only for unidirectional operation. )
