Mehrstufengetriebe.

摘要

A collar shift type gearbox is arranged to provide an increased number of speed changes from a reduced number of gears and shafts. The gearbox has a main shaft (44), an output shaft (128) and two intermediate shafts (92, 110) with a plurality of intermeshing gear sets located on each shaft. Collar shift selectors (88, 90, 125, 126) for engaging different gears to provide a multiplicity of speed and range changes are provided only on the main shaft (44) and one intermediate shaft (110). Arrangement of the gears of each set in pairs maximizes the number of gear changes while minimizing the required number of gears, collar shift selectors and control mechanisms. The gears on the first intermediate shaft (92) and on the output shaft (128) are fixed to these shafts. The first selectors (88, 90) on the main shaft (44) couple the gears (80, 82, 84, 86) on this shaft to the shaft. A second selector (125) couples to the second intermediate shaft (110) one or the other of two gears (118, 120) in mesh with gears (98, 100) fixed on the first intermediate shaft. A third selector (126) couples to the second intermediate shaft (110) one or the other of two gears (122, 124) in mesh with gears (134, 136) fixed on the output shaft (128). The main shaft (44) is preferably provided with synchronizer selectors and close coupled to the driven portion of a main clutch (26) to minimize the momentum transfer through the synchronizers. A sectional housing (18) for the gearbox supports an eccentrically mounted hydraulic pump (20) which can be rotated to a plurality of positions. An additional housing section can be added to hold a planetary gear system preceding the clutch (26) to double the number of speeds while still minimizing the momentum transfer across the synchronizer selectors. The main shaft (44) is preferably hollow to allow insertion of a PTO shaft (202) connected directly to the input shaft (24).