Model DD4640 Rotary-Kiln Gear Drive Unit

Original manufacturer	GDW, SKET
Used for	4.5 m dia. x 170 m Rotary kiln Cement wet process
Rating / Motor rating	340 kW
Design factor / Factor KA	1.59 (no standardised design method)
Driving speed	730 rpm
Transmission ratio	140.0246
Bearings fitted	Plain journal bearings
Weight of gear drive unit	Complete with external bearing, auxiliary drive (without motor) 115,000 kg
Rehabilitation capability of the original gear drive	High expenditure; no patterns; hardened and tempered teeth; re-design necessary. Previous gears not designed to meet fatigue strength requirements for higher rating.

Variant 1 Replacement:
Vakoma 4640V - 1 Gear Drive Unit

Rating	630 kW
Factor KA	2.0 (designed to DIN 3990 Part 11)
Driving speed	750 rpm
Transmission ratio	140.116
Bearings fitted	Antifriction bearings
Weight	Complete with separate external bearing and auxiliary drive approx. 69,000 kg

Variant 2 Replacement:
Vakoma 4640V - 2 Gear Drive Unit

Rating	500 kW
Factor KA	2.0 (designed to DIN 3990 Part 11)
Driving speed	1,000 rpm
Transmission ratio	138.876
Bearings fitted	Antifriction bearings
Weight	Complete with separate external bearing and auxiliary drive approx. 59,000 kg

Variant 3 Replacement:
Vakoma 4640V-2/1 Gear Drive Unit as twin drive

Drive configurations for higher kiln speeds can be designed and manufactured upon request.

Note
Potential replacement with Vakoma 4640V-1 or Vakoma 4640V-2 gear drive unit that comes with gears designed to meet fatigue strength requirements. Antifriction bearings designed for > 100.000 h (approx. 14 years). Mounting on foundation and ring-gear guarding need to be co-ordinated.

	DDD4640 Original drawingDownload PDF-file
	Vakoma 4640V – 1 OutlineDownload PDF-file
	Vakoma 4640V – 2 OutlineDownload PDF-file
	Vakoma 4640V - 2 – Kiln drive unitDownload PDF-file

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