Shock Guard TGK Series
- Multi-functional type with air clutch function
- ・You can remotely adjust the torque during operation by adjusting the air pressure in the regulator.
- ・Type 2 to which A-type sprockets can be directly attached, and Type 5 and Type 7 combined with Echt-flex coupling can be selected.
- ・The balls and pockets, which transfer the torque, are engaged only in one position because of the unique structure.
- ・Also usable as an ON-OFF clutch in remote control.
Usable sprocket minimum number of teeth
・TGK Series
| Model No. | Minimum number of teeth for sprockets | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RS35 | RS40 | RS50 | RS60 | RS80 | ||||||||
| TGK20 | 30 | 24 | 20 | 17 | - | |||||||
| TGK30 | 37 | 29 | 24 | 20 | 16 | |||||||
| TGK45 | 50 | 38 | 32 | 27 | 21 | |||||||
Note) Sprocket transmissible power is not considered,
Construction
(1) Hub (2) End nut (3) Hex set screw (4) Set piece (5) Drive plate (6) Slide plate
(7) Cylinder (8) Pipe joint (9) Cylinder cover (10) Hexagonal countersunk screw (11) Piston (12) Sealing A (13) Sealing B
(14) Drive ball (Ball A) (15) Bush (16) Snap ring A (17) RADIAL BEARING
(18) Thrust bearing A (19) Thrust bearing A (20) Housing (21) Hexagonal countersunk screw
(22) Thrust bearing B (23) Thrust race (24) Dry bearing (25) Ball bearing
(26) Snap ring B (27) Sensor target (28) Hexagonal nut (29) Grease nipple
Operating principle
Animation showing the operating principle of the TGK Series.
During normal operation (engagement)
The TGK series transfers driving force from the hub to the drive plate on the output side via drive balls (and vice versa).
Bolt a sprocket or belt sprocket directly to the drive plate.
The hub flange has several holes to hold the drive balls.
There are pockets on the drive plate on the output side, and the drive balls are fitted into the pockets.
If you feed air into the cylinder through the air supply port, the piston moves toward the drive plate.
Then, the drive balls are pushed via the slide plate and transfer the driving force.
You can change the torque according to the load during operation. You can also change the torque automatically by making a system to change the pressure using a timer or controller.
For instance, by using such a system to switch between a high torque corresponding to the starting torque and a low operating torque, you can set the torque to the optimal value for the machine.
During overload (trip)
When an overload occurs, the drive balls push back the slide plate toward the cylinder against the air pressure.The drive balls then come out of the pockets and start to idle.
By detecting the amount of movement of the sensor target toward the cylinder by a limit switch and removing the force applied to the drive balls by removing the air from the cylinder, you can completely release the driving force and protect the machine.
＊Refer to the product model number page for the limit switch installation example.
Clutch mechanism
To disconnect the drive source for adjustment or maintenance of the machine, stop feeding air and remove the air from the cylinder. The housing and slide plate are then pushed back toward the cylinder by the built-in spring.
Consequently, the drive balls come out of the pockets on the drive plate for declutching.
The drive plate has a bearing inside, and therefore there are no problems even if the drive plate is left to idle for a long period of time.
Resetting (clutching) procedure
If you supply air from the air supply port and restart the operation, the drive balls automatically return to their positions within one revolution.
If you continue to rotate the TGK series while feeding air after the occurrence of an overload, the TGK series repeatedly reset. Therefore, detect overloads using a limit switch or a similar device and stop feeding air.
Package (Standard models )
| Set torque range N・m | Repeat working torque precision | Backlash | Reset method |
|---|---|---|---|
| 15～392 | ±5% | Minimal | Automatic |
■Type 2 ：Enables direct mounting of A type sprockets and belt sprockets.
■Type 5 ：The Echt-Flex Coupling provides an angular tolerance. Cannot allow parallelism errors.
■Type 7 ：The Echt-Flex Coupling provides angular and parallelism tolerances.
Catalogs ・Instruction Manuals
Model No. Designation
※No-coupling type
| TGK | 20 | - | A | 2 | - | TH20JD2 |
| ｜ Series |
｜ Size |
｜ ｜ ｜ |
｜ Type 2：Type 2 |
｜ Shaft bore code |
||
| Air pressure | ||||||
※Coupling type
| TGK | 20 | - | A | 5 | - | TH20JD2 | X | CH30JD2 |
| ｜ Series |
｜ Size |
｜ ｜ ｜ ｜ |
｜ Type 5：Type 5 7：Type 7 |
｜ Shock guard side Shaft bore code |
｜ Coupling side Shaft bore code |
|||
| Air pressure | ||||||||
| Shaft bore tolerance | Shaft Bore Diameter | Keyway tolerance | Set screw positioning | |
|---|---|---|---|---|
| T | H | 20 | J | D2 |
| C | H | 30 | J | D2 |
| T:Shock guard side C:Coupling side | F:F7 G:G7 H:H7 |
Shaft bore diameters are in 1mm units. | J:New JIS Js9(Standard ) P:New JIS P9 F:Old JIS F7 |
 [Click to enlarge ] |
■Tsubaki model No. navigation
List of Model Numbers
※Click the model No. for detailed information.
| Set torque range N･m |
No-coupling type | Coupling type | |||
|---|---|---|---|---|---|
| Range of Shaft Bore Diameters mm |
Model No. | Bore Diameter Range on Coupling Side mm |
Model No. | ||
| Type 2 | Type 5 | Type 7 | |||
| 15～65 | 10～20 | TGK20-A2 | 17～42 | TGK20-A5 | TGK20-A7 |
| 30～147 | 12～30 | TGK30-A2 | 17～60 | TGK30-A5 | TGK30-A7 |
| 90～392 | 22～45 | TGK45-A2 | 27～74 | TGK45-A5 | TGK45-A7 |
Sizing
Our selection calculator will select the right Shock Guard from Tsubaki's entire Shock Guard series to match your usage conditions.
Click the "Sizing" tab at the top of this page.
Back to topTorque adjustment
Torque adjustment can be performed accurately by referring to the torque correlation chart, adjusting the air pressure that matches the required torque with the regulator (pressure regulator) and feeding air into the cylinder of TGK.
You can even change the operating torque during operation by changing the air pressure.
Operating air pressure ・・・0.14～0.55MPa
(Note ) Be careful to keep the air supply source pressure higher than the preset pressure.
| Size | Minimum torque N・m |
Maximum torque N・m |
|||
|---|---|---|---|---|---|
| TGK20 | 15.0 | 65.0 | |||
| TGK30 | 30.0 | 147 | |||
| TGK45 | 90.0 | 392 |
Torque Correlation Chart
Air control system
However, it is possible to change the operating torque of the TGK series during operation by changing the air pressure. Therefore, you can protect the machine by setting the torque higher than the starting torque only at startup, and then change the torque to the optimal value at a later time (refer to the figure on the right).
