Our marine gearbox is produced according to the technology introduced from LOHMANN, Germany. It covers six series, among which, GWC, GWD, GWS and GWH series are ahead-astern clutch reduction gearboxes; GWL and GWK clutch reduction gearboxes. Their structural features are as follows:
GWC series: Have double-step reduction (primary and final) and reversal step input shaft and output shaft are homocentric arranged, with the rotation direction same SGW model of double ratios is a derivative of GWC series.
GWD series: Have single-step reduction (no primary) and reversal step one of the two clutch shafts functions as a driving shaft; Input and output shafts are angular heterocentric arranged, with the rotation direction contrary.
GWS series: No primary device, only have final and reversal step; Input and output shafts are vertical heterocentric arranged, with the rotation direction contrary.

GWH series: No primary reduction device, only have final and reversal steps; Input and output shafts are horizontal heterocentric arranged, with the rotation direction cintrary.
GWL series: Have no functions of ahead and astern; Similar to GWC series in construction, but only have primary and find reduction devices; Input and output shafts are homocentric arranged with the rotation direction same.
GWK series: Have no functions of ahead and astern; Only have single-step reduction device; Input and output shafts are vertical heterocentric arranged with the rotation direction contrary.