Power transmission device for vehicle

Abstract

An output shaft is arranged to be lateral and parallel to engine input shafts and a motor input shaft. An engine side gear mechanism for transmitting a power of the engine input shafts to the output shaft is provided. A motor side gear mechanism for transmitting a power of the motor input shaft to the output shaft is provided. An input side clutch engages and disengages the engine input shafts and the motor input shaft. When the input side clutch is engaged, the power transmission between a position where the engine side gear mechanism is arranged on the engine input shafts and a position where the motor side gear mechanism is arranged on the motor input shaft is invariably possible.

1 . A vehicular power transmission device that transmits powers generated by an engine and a motor to an axle of a vehicle, the power transmission device comprising:
 an engine input shaft, to which the power generated by the engine is inputted and which transmits the inputted power of the engine;   a motor input shaft, to which the power generated by the motor is inputted and which transmits the inputted power of the motor;   an output shaft for outputting the power to be transmitted to the axle;   an engine side gear mechanism provided to the engine input shaft for transmitting the power of the engine input shaft to the output shaft not through the motor input shaft;   a first motor side gear mechanism provided to the motor input shaft for transmitting the power of the motor input shaft to the output shaft not through the engine input shaft; and   an input side clutch for engaging and disengaging the engine input shaft and the motor input shaft, wherein   when the input side clutch is engaged, the power transmission is enabled between the engine side gear mechanism on the engine input shaft and the first motor side gear mechanism on the motor input shaft.   
     
     
         2 . The vehicular power transmission device as in  claim 1 , wherein
 when the input side clutch is disengaged, the power of the engine input shaft and the power of the motor input shaft are enabled to be transmitted to the output shaft at different reduction gear ratios at the same time.   
     
     
         3 . The vehicular power transmission device as in  claim 1 , wherein
 a reduction gear ratio of the engine side gear mechanism is smaller than a reduction gear ratio of the first motor side gear mechanism.   
     
     
         4 . The vehicular power transmission device as in  claim 1 , wherein
 a reduction gear ratio of the engine side gear mechanism is the smallest among reduction gear ratios of gear mechanisms provided to the vehicular power transmission device, and   a reduction gear ratio of the first motor side gear mechanism is the largest among the reduction gear ratios of the gear mechanisms provided to the vehicular power transmission device.   
     
     
         5 . The vehicular power transmission device as in  claim 1 , further comprising:
 a second motor side gear mechanism provided to the motor input shaft for transmitting the power of the motor input shaft to the output shaft not through the engine input shaft, wherein   a reduction gear ratio of the first motor side gear mechanism and a reduction gear ratio of the second motor side gear mechanism are larger than a reduction gear ratio of the engine side gear mechanism.   
     
     
         6 . The vehicular power transmission device as in  claim 1 , wherein
 the engine side gear mechanism is arranged between the first motor side gear mechanism and the engine.   
     
     
         7 . The vehicular power transmission device as in  claim 6 , wherein
 the input side clutch is arranged between the engine side gear mechanism and the first motor side gear mechanism.   
     
     
         8 . The vehicular power transmission device as in  claim 6 , wherein
 the input side clutch is arranged between the motor and the first motor side gear mechanism,   the motor input shaft includes a cylindrical motor input shaft fixed to a portion of the input side clutch that rotates with the motor input shaft,   the cylindrical motor input shaft surrounds another portion of the input side clutch that rotates with the engine input shaft and extends toward the engine to surround the engine input shaft,   the cylindrical motor input shaft is structured to rotate with the other part of the motor input shaft, and   the first motor side gear mechanism is fixed to an end portion of the cylindrical motor input shaft closer to the engine between two end portions of the cylindrical motor input shaft.   
     
     
         9 . The vehicular power transmission device as in  claim 6 , wherein
 the input side clutch is arranged between the engine and the engine side gear mechanism,   the engine input shaft includes a cylindrical engine input shaft fixed to a portion of the input side clutch that rotates with the engine input shaft,   the cylindrical engine input shaft surrounds another portion of the input side clutch that rotates with the motor input shaft and extends toward the motor to surround the motor input shaft,   the cylindrical engine input shaft is structured to rotate with the other part of the engine input shaft, and   the engine side gear mechanism is fixed to an end portion of the cylindrical engine input shaft closer to the motor between two end portions of the cylindrical engine input shaft.   
     
     
         10 . The vehicular power transmission device as in  claim 1 , wherein
 the motor is arranged between the engine and the first motor side gear mechanism, and   the engine side gear mechanism is arranged on a farther side of the first motor side gear mechanism from the engine.   
     
     
         11 . The vehicular power transmission device as in  claim 10 , wherein
 the input side clutch is arranged between the motor and the engine.   
     
     
         12 . The vehicular power transmission device as in  claim 10 , wherein
 the input side clutch is arranged between the engine side gear mechanism and the first motor side gear mechanism.   
     
     
         13 . The vehicular power transmission device as in  claim 1 , wherein
 the input side clutch is a clutch that transmits driving torque only from the engine input shaft side to the motor input shaft side, and   a reduction gear ratio of the motor side gear mechanism is larger than a reduction gear ratio of the engine side gear mechanism.   
     
     
         14 . The vehicular power transmission device as in  claim 1 , further comprising:
 a controller for controlling transmission routes and reduction gear ratios of the powers generated by the engine and the motor by controlling the engagement/disengagement of the input side clutch, the motor side gear mechanism and the engine side gear mechanism based on a physical quantity obtained within the vehicle, wherein   the controller selects operation modes of the engine and the motor allotted to the obtained physical quantity based on a predetermined switching map that allots the operation modes to a value of the physical quantity and realizes the selected operation modes by controlling the engagement/disengagement of the input side clutch, the motor side gear mechanism and the engine side gear mechanism.   
     
     
         15 . The vehicular power transmission device as in  claim 14 , wherein
 the motor rotates using an electric power of a battery mounted to the vehicle for driving the vehicle,   the controller stores a plurality of kinds of switching maps beforehand,   the controller obtains SOC, or a state of charge, of the vehicle driving battery, and   the controller selects one of the plurality of kinds of switching maps based on the obtained SOC.