Curtiss-Wright Defense Solutions

Rotary Gear Drives

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The Electrical Rotary Gear (ERG) line of drives provide a critical component in the traverse and elevation of a turret by accurately transferring the motor's motion, both while aiming at constant low speeds as well as in stabilize mode, controlling highly dynamic movements.

All linear drives are modular where the servo drive and hand crank can be repositioned if there are location and space restraints. Dual redundant brakes and a manual backup drive (for use when power is off) are also included for system security.


ERG 100L	ERG 400L	ERG 800

ERG 1500	MRG 40

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Turret Aiming and Stabilization Drive System

	ERG 100L	ERG 400L	ERG 800	ERG 1500N
Typical Traverse drive turret size	1,500 kg 3307 lb	5,500 kg 12125 lb	8,000 kg 17637 lb	20,000 kg 44092 lb
Typical elevation drive weapon caliber	20 mm 0.78"	90 mm 3.54"	105 mm 4.13"	120 mm 4.72"
Nominal output torque	100 Nm	400 Nm	800 Nm	1,500 Nm
Gear ratio motor: pinion	16:1 to 100:1	16:1 to 40:1	16:1 to 40:1	16:1 to 64:1
Rigidity with motor shaft blocked	>60 kNm/rad	>200 kNm/rad	>360 kNm/rad	>600 kNm/rad
Backlash with motor shaft blocked	<5 arc minutes	<5 arc minutes	<5 arc minutes	<5 arc minutes
Approx. weight with motor	16 kg 35.27 lb	40 kg 88.18 lb	80 kg* 176.36 lb*	145 kg* 319.67 lb*
Typical dimensions (l x w x h) mm	336 x 137 x 198 13.23 x 5.39 x 7.79"	460 x 195 x 310 18.11 x 5.71 x 9.84"	580 x 210 x 450* 22.83 x 8.27 x 17.72"	720 x 290 x 450* 28.35 x 11.42 x 17.72"

* Including gearhead

	MRG 40
Typical traverse drive turret size	1,000 kg 2205 lb
Typical elevation drive weapon caliber	20 mm 0.78"
Nominal output torque	40 Nm
Gear ratio motor: pinion	max. 3 mm max. 0.11"
Backlash	<50 arc minutes
Approx. weight	11.5 kg 25.35 lb
Typical dimensions (l x w x h) mm	200 x 245 x 200 7.87 x 9.65 x 7.87"