Patent ID: 6440032
Filing Date: 2002-08-27
Classification: F16H

Abstract:
A transmission having a basic configuration providing a basic number of gear ratio steps and corresponding gear ratios and implementable in a plurality of variants having selected numbers of transmission gear ratio steps and associated gear ratios, the variants sharing a common transmission housing and being implemented solely by the addition of pairs of gears and associated shift devices within the transmission housing or by the alteration of existing gear ratios, the basic transmission configuration comprising:a split gear part having an input shaft; a main gear part having a main shaft concentric with the input shaft; a shared countershaft parallel to both the input shaft and the main shaft; and a group transmission part having an output shaft from a planetary transmission connected from the main shaft and a planetary shift device to select a ratio thereof; constant selection gears including a first constant gear pair mounted on the input shaft and the countershaft and a second constant gear pair mounted on the main shaft and the countershaft and an associated shifting device for engaging a desired one of the first and the second constant gear ratios; a reversing gear and an associated reversal shifting device connected between the main shaft and the countershaft for reversing rotation of the transmission output; and a pair of transmission ratio gears mounted on the main shaft and the countershaft and an associated ratio shifting device for engaging the ratio gears to select a corresponding gear ratio.