Patent ID: 7473203
Filing Date: 2009-01-06
Classification: F16H

Abstract:
1. A transmission apparatus comprising: a crankshaft that takes out the power of an engine as a rotational force; a first clutch that is connected with the crankshaft for transmitting and interrupting the rotation of the engine; a first input shaft that is connected with the first clutch at a side opposite to the crankshaft; a second input shaft that is arranged on an extension of the first input shaft; an output shaft that is arranged in parallel to the first input shaft and the second input shaft; a planetary gear mechanism that includes a first planetary gear train, a second planetary gear train, a sun gear being common for the first and second planetary gear trains, a band brake for fixing the sun gear, and a second clutch that connects the sun gear with a first ring gear of the first planetary gear train, the planetary gear mechanism being operable to transmit the rotation of the first input shaft to the second input shaft; a selection type gear train unit that includes a plurality of gear trains having a nonsynchronized gear train that does not use any synchronization mechanism, the selection type gear train unit being operable to transmit the rotation of the second input shaft to the output shaft; a second rotation speed detection part that detects the rotation speed of the second input shaft as a second rotation speed; a first clutch actuator that drives the first clutch; a band brake actuator that drives the band brake; a second clutch actuator that drives the second clutch; a shift actuator that shifts the gear trains of the selection type gear train unit; and a gear shift control part to which the second rotation speed is input, and which controls the operations of the first clutch actuator, the band brake actuator, the second clutch actuator and the shift actuator; wherein when a request for shift to the nonsynchronized gear train is generated, the gear shift control part releases the first clutch, tightens the band brake, and at the same time connects the second clutch thereby to decrease the second rotation speed, and when the second rotation speed becomes equal to or less than a predetermined rotation speed, the gear shift control part shifts the gear trains of the selection type gear train unit to the nonsynchronized gear train.