| 摘要 |
A speed change gear transmission providing at least six speed ratios from eight gears, and nine speeds from nine gears. The transmission has an input shaft, an intermediate shaft, and an output shaft. At least three gears are associated with the input and intermediate shafts, and two gears with the output shaft. In the preferred embodiments, the number of gears associated with each shaft is equal, is at least three, and optionally may be four or more. The number of available speed ratios in embodiments having equal numbers of gears on each shaft is equal to the square of the number of gears on any one shaft. Gears of the intermediate shaft are solidly fixed to rotate in tandem. Gears of the input and output shafts are freely rotatable on bearings on their respective shafts, and are splined to engage dog clutches. The dog clutches are disposed in slidable, splined relation to their respective shafts to selectively couple one of the input shaft gears to the input shaft and one of the output shaft gears to the output shaft. Dog clutch operation may be by manual, solenoid, pneumatic, or hydraulic action. A lock out feature disabling one or more ratios is optional. |
