1 TFD 2 TFD 1 TF 1 TFD 2 TFD 2 TF 3 TF Single layer Two layers Three layers DA 00 DA 0 - 5 DA 6 - 10 DA 0 - 5 DA 6 - 10 DA 01 - 5 Torque Limiting Couplings DELTA Torque Limiter Series DA Disc Spring Layers For torque limiters three different layers of disc springs are possible. a) Disc springs in single layer for torque limiters DA 00 to DA 8 b) Disc springs in two layers for torque limiters DA 00 to DA 8 c) Disc springs in three layers for torque limiters DA 1 to DA 5 If case c) is used, the width of the driving part is reduced and it should only be used when the dimensions of the construction are limited. Special adjustment unit is necessary. Special adjustment nuts The DELTA DA torque limiter 0 to 5 requires in the lowest torque ranges and/or at higher revolutions a special adjustment nut with tangential clamping. Friction discs The friction discs of the torque limiters are free of asbestos. Special friction discs for long slippage and rust-free surfaces are available on request. Bushing for centring drive part The centring bush is manufactured from bronze for it's slide and wear properties.. All torque limiters are equipped with the longest bushing. Shorter bushing for smaller driven parts must be specially ordered. The calculation of the length of the bushing is as followed: length of bushing = 1,5 x s1 + b1 (see dimensions) Possible application of disc spring Experience shows that wear is less when a single disc spring is used, when double springs are used there is more wear and when triple springs are used , wear is much greater. Generally the time of wear of a friction disc depends on the adjusted torque, the rotational speed, the time of slippage and the frequency of slippage. Example Torque limiter DA 3 Thickness of drive part b = 12mm Torque limiter DA 3 Thickness of friction disc s = 4mm 1,5 x 4 + 12 = 18 mm length of bushing When ordering if no thickness of the driven part has been given, maximum length will be supplied. www.jbj.co.uk/torque-limiting-couplings.html 3 #DriveLineHarmony
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