| 摘要 |
A multiple speed power transmission for coupling to an engine includes a gear box or housing having an input and an output shaft, each rotatably mounted in the housing and extending therefrom. A clutch is coupled to releasably engage the input shaft to thereby couple the input shaft to an engine or the like. A plurality of first gears freely rotate on the input shaft while a plurality of second gears are mounted to the output shaft to rotate with the output shaft. Each of the second gears are intermeshed to constantly couple to one of the first gears. The input shaft has a bore extending thereinto from one end thereof and has a plurality of side openings into the center bore. A plurality of first gear engaging members are located between the input shaft in each of the first gear members for selectively engaging each first gear to the input shaft such that only one first gear is engaged to the input shaft at a time. An elongated gear changing bar is movably mounted in the input shaft bore and has engaging portions thereon which can be aligned through the input shaft openings for engaging one of the plurality of first gear engaging members to the input shaft when the elongated gear changing bar is positioned in a predetermined position to thereby couple the input shaft through one first gear to one second gear to thereby couple the input and output shafts. Coupling can be accomplished through spherical wedging members, such as ball bearings, placed in the input shaft side openings, and in which each opening is an angled or arced opening to allow wedging of the wedging members between the input shaft and the first gear. The elongated gear changing bar can be either slid axially within the input shaft bore or rotated within the input shaft bore to align raised or camming surfaces with the input shaft openings to selectively lift the spherical wedging members.
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