| 摘要 |
A friction stepless speed change device includes an input shaft (8), a driven shaft (13) and an output shaft (6) arranged on a common axis, and a countershaft (24) rotatably provided in parallel with the common axis. The device further includes two rockable arms (25,26) rockable about the countershaft (24), a cylindrical driving rotary assembly (33) rotatably provided on free ends of the rockable arms (25,26) to enclose the driven shaft (13), a set of driving friction discs (52) rotating together with the driving rotary assembly (33), and a set of driven friction discs (51) rotating together with the driven shaft (13). The countershaft (24) includes a first gear (61) in mesh with a gear (60) fixed to the input shaft (8), a second gear (62) in mesh with a gear (63) fixed to the driving rotary assembly (33), and a third gear (65) in mesh with a sun gear (66) of a planetary gear provided on the driven shaft (13). The output shaft (16) is integrally formed with an internal gear (21) in mesh with planet gears (72) of the planetary gear.
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