| 摘要 |
<p>APPLICATION OF: TIMOTHY J. MORSCHECK FOR: AUTOMATIC TRANSMISSION Disclosed is a power shift transmission having two input shafts, an output shaft, two countershafts which are first synchronized and clutched with either of the input shafts, and then alternately clutched to the output shaft. Each countershaft rotatably supports a ratio gear driven by one of the input shafts, a ratio gear driven by the other input shaft, and a drive gear for driving the output shaft. A reverse gear is rotatably supported by one of the countershafts. A double acting synchronizer is disposed between the two ratio gears on each countershaft for synchronizing and clutching either of the ratio gears to the countershaft. A hydraulically actuated friction clutch is disposed adjacent the drive gear on each countershaft for clutching the countershaft to the driven gear. One of the input shafts is a torque converter driven shaft; this shaft drives the ratio gears which are first and second speeds and the reverse gear. The other input shaft is a torque converter bypass shaft; this shaft drives the ratio gears which are third and fourth speeds. The transmission utilizes helical gears and the helical angle direction of the ratio and drive gears on the countershafts are such that axial forces on the contact teeth of the gears impart bending stresses on the countershaft which subtract from bending stresses on the shaft caused by radial forces on the contacting teeth of the gears.</p> |
