Transmission with overrunning clutches

Abstract

A vehicle transmission having power shift means and an overrunning clutch to selectively provide a multiple speed transmission with shifting of the vehicle transmission while the vehicle is operating. The transmission includes a main drive shaft, a jackshaft and a countershaft with a selective manual gear shift on the countershaft. The main drive is through the countershaft and a plurality of gearsets having clutching means to manually select one of a plurality of speed ratios. The first input speed drives through the first overrunning clutch to the main drive shaft. The jackshaft is selectively engaged through a power shift clutch to provide a second input speed to the main drive shaft. When the jackshaft is in operation, the first overrunning clutch is disengaged and the drive is through the power shift clutch to rotate the main drive shaft at the higher speed. This provides two input speeds to the main drive shaft which are controlled by the operator by selectively engaging or disengaging of the power shift clutch. The second overrunning clutch is connected between the input shaft and the jackshaft and normally is disengaged when the jackshaft is in operation. The second overrunning clutch, however, provides the advantage of having a means for braking the vehicle through the engine when the vehicle is coasting and power shift clutch is disengaged, since the second overrunning clutch is then engaged and counterrotates to provide the braking means.

Dependencies are inferred from the claim text.