Series 600 Torque Limiter - American Autogard - Power and Transmission Couplings and Torque Limiters

The Autogard Airjustor is a pneumatically controlled, combined torque limiter and disengaging clutch that offers the power transmission engineer a host of new drive control options.As a disengaging clutch the air is dumped at the press of a button, the drive balls role out of the seats without skidding to completely disengage the drive, and the plates are held apart by spring pressure so that no drive is transmitted by the coupling. Shield bearings are provided between the hub and main adaptor/ drive plate to give completely free running clutch. As a torque limiter, overload protection for the drive is provided by the same mechanism. The supply air pressure may be set in the range of 1.4 to 5.4 bar (20-80 psi) to give the precise overload torque requirement using a pressure regulator. This can be done manually during normal running to take account of changing loads, or automatically using a duel regulator system with a timer or other control. This allows high start torque to be accommodated before switching to lower running torque. When the torque setting is exceeded, the balls begin to roll out of their seats, forcing the plates apart against the air pressure. This motion operates a pneumatic limit switch which "dumps" the air pressure, disengaging the clutch and releasing the drive from the overloaded machine. Re-engagement is affected in both cases by simply operating a push button initiating valve. Rotation of the drive will then engage the clutch..

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Features and Benefits
•	Sensitive and accurate torque limitation.
•	"On the fly" torque overload adjustment.
•	Increase air pressure for high starting torques. Reduce air pressure for lower running torque.
•	Total drive disconnection for on/off drive applications.
•	Rolling disengagement with no ball skidding for increased sensitivity and life.
•	Synchronous re-set.
•	The standard design accommodates larger torque ranges.
•	Series 600 is offered in a large number of styles ensuring the right solution is available for all applications.

Series 600 Airjustor Torque Limiter Selection

Method

Data required for Torque Limiter Selection:-
•	Horsepower / Kilowatts and rpm of the drive
•	Shaft details of the driving and driven equipment

(1)	Calculate the maximum Torque as follows:-
	•	Torque (Nm) = kW x 9550 / rpm
	or
	•	Torque (in-lbs) = H.P. x 63025 / rpm

Consideration should be given to starting torque particularly if the Airjustor is positioned close to the motor. This may be up to three times the normal running torque, and can be accommodated by the "in-motion" control facility (refer to Autogard).

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(2)

From the table bellow chose the size of unit for the torque calculated. Ensure that the torque range is sufficient to meet expected adjustments, and that the bore capacity is adequate. Finally, check the overall model dimensions

Size	Max Bore (mm)	Type of piston	Torque Range (Nm)
0	16	8 pistons	7 - 28
		4 pistons	3.5 - 14
1	22	8 pistons	28 - 130
		4 pistons	14 - 56
2	32	8 pistons	85 - 340
		4 pistons	42 - 170
3	40	Annular pistons	170 - 680
		6 pistons	85 - 340
4	52	Annular pistons	288 - 1150
		8 pistons	144 - 575
5	80	Annular pistons	710 - 2840
		8 pistons	300 - 1200

(Larger sizes up to 100,000 Nm are available. Refer to model 403 for details.)

All Series 400 units may be supplied from the factory at a pre-set torque, or with springs for the full or partial torque range specified. The accuracy of the Autogard Series 400 will ensure that disengagement will only take place when the pre-set torque is exceeded.

(2)	a)	Check the Torque Limiter dimensions such as Overall Length and Outside Diameter.
	b)	Check minimum sprocket / pulley dimensions given for applicable models.

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Ordering the 600 Airjustor Torque Limiter

Model: 602, 605 or 606
Type: T = Synchronous Reset; R = Random Reset
Size: 0 to 5, check torque and bore capacities
Pistons: Refer graphs below

Example
Model - 605	Membrane coupling
Type - T	Synchronous reset
Size - 5	Size (86mm at 2550 Nm)
Piston - MP4	4 Multi-pistons
Designation	605-T-5-MP4

Specify

Bore(s)
Key size & tolerance
Drive medium (if applicable)