| 摘要 |
A positive clutch power shift transmission, more particularly for a land vehicle which is readily synchronized and power shifted during upshifting and downshifting, has an input shaft (16) driven by a torque converter (not shown), a countershaft in continuous driving relation with the input shaft, an output shaft (20) having first (86), second (170), and third (172) speed ratio gears journalled thereon and driven via the countershaft, a reverse speed ratio gear (168) splined to the output shaft and driven via a gear on an idler shaft driven by the countershaft, a first friction clutch (84) mechanism for connecting the first speed ratio gear to the output shaft, a second friction clutch mechanism (82) for connecting the output shaft directly to the input shaft, a blocker-clutch assembly (30) for coupling the second and third speed ratio gears to the output shaft, and an actuator assembly (32) for shifting the blocker-clutch assembly into and out of coupling engagement. The friction clutches (84, 82) are momentarily engageable to relieve driving and coast mode torque on the blocker-clutch and to synchronize the blocker-clutch. In an alternative embodiment a torque converter driven shaft drives the countershaft and a torque converter bypass shaft which is connected directly to the output shaft (20) via the second friction clutch mechanism (82). |
