Reverse Gear

Power Flow - Reverse Gear





Moving the reverse shift fork forward, slides the reverse idler gear (175) forward on the reverse idler gear shaft. The reverse idler gear (175) engages with the countershaft reverse gear and with the outer or reverse gear teeth on the 1st/2nd synchronizer sleeve (170). The synchronizer sleeve is the reverse gear in this application. The synchronizer sleeve (170) is slip splined on the synchronizer hub. The synchronizer hub is pressed on the output shaft (1195). The power flow in reverse is from the input shaft (100), to the countershaft (400), to the reverse idler gear (175), to the reverse gear teeth on the 1st/2nd synchronizer sleeve (1170), through the synchronizer and to the output shaft (195). Using the 5th /reverse synchronizer avoids gear clash when shifting in reverse. When moving the reverse shift fork forward, simultaneously the 5th shift fork (250) moves the 5th /reverse synchronizer sleeve (254) forward. The internal splines of the synchronizer sleeve slide on the splines of the 5th countershaft gear (450). At the same time, the synchronizer sleeve splines are pushing against the teeth on the reverse gear synchronizer ring (276). The action moves the reverse gear synchronizer ring (276) forward. The reverse/5th inner ring (278), or pull ring, locking to the reverse gear synchronizer ring (276) moves forward. The reverse/5th inner ring (278) pulls forward, and tabbed lock to the reverse/5th internal ring (277) forces the reverse internal ring (277) against the 5th gear blocking ring (256). The 5th gear blocking ring (256) is moving at the same revolutions as the output shaft (195). The reverse internal ring (277), tabbed to the 5th synchronizer gear (255), is revolving at the countershaft (400) speed. The synchronizer action matches the revolutions of the countershaft (400) to output shaft (195) revolutions, allowing the reverse idler (1175) to engage without gear clashing.