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.
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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 Keeper ・Mini Keeper
Slipping clutch and brake capable of continuous slipping, with the friction facings made of fine chemicals.
In addition to the anti-wear design, features the torque indicator and light-weight body for ease of use.
Torque Keeper
Model No. TFK～
Tsubaki's original slipping clutch & brake
- ・Using special fine chemical fibers for the friction facings, longer life can be expected.
- ・Smoothly transmits slipping torque due to the small torque fluctuations.
- ・Even with high-frequency, repeated slipping torque, stable torque is transmitted consistently.
- ・Coupling type is also available.
Set torque range
0.6～650 N・m
Backlash
NO
(Only for unidirectional operation. )
Mini Keeper
Model No. MK～
Ultra-compact slipping clutch & brake
- ・Use of engineering plastic materials makes the Mini Keeper ultra-light and compact.
- ・By employing fine chemicals for the friction surface, delivers long service life, stable slipping torque, and accurate torque repeatability.
Set torque range
1.96～39.2 N・cm
Backlash
NO
(Only for unidirectional operation. )
