Power transmitting system for a four-wheel drive motor vehicle
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorToshio Kobayashi
Life of this patent
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Abstract
A central differential has first and second output members for distributing power of an engine through a transmission to front and rear wheels respectively, and has a third output member for controlling distribution of the power. A first friction clutch is operatively connected to the first and second output members for restricting differential operation of the central differential and for controlling distribution of the power to the front and rear wheels. A second friction clutch is operatively connected to the second output member and either the front or rear wheels. A brake is provided for braking the second output member for providing a higher speed gear ratio than that of the smallest gear ratio of said transmission and to improve driveability of said vehicle.
Claims15
A power transmitting system for a motor vehicle provided with a complex planetary gear device having an input member operatively connected to a transmission for receiving a rotation of an engine through the transmission, first and second output members for transmitting the rotation to wheels, and having a third output member connected to the first output member for controlling a differential operation between the first output member and the second output member of the complex planetary gear device, the system comprising:
- first friction engagement means operatively connected to the second and third output members for restricting the differential operation of the complex planetary gear device to uniformly rotate the first output member and second output member;
- second friction engagement means provided on the second output member for braking a rotation of the second output member so as to provide a higher speed gear ratio than that of a smallest gear ratio of said transmission and to improve driveability of said vehicle.
A power transmitting system adapted for a vehicle having a transmission with an output shaft, the power transmitting system comprising main parts which comprise:
- a complex planetary gear device having a first sun gear operatively connected to said output shaft of said transmission, a carrier operatively connected to either front or rear wheels of the vehicle, first and second planetary pinions integral with each other and rotatably supported on said carrier, and a second sun gear engaged with said second planetary pinion while said first sun gear is engaged with said first planetary pinion;
- an intermediate shaft operatively connected to said carrier;
- first restricting means, being rotatable, and for operatively connecting said second sun gear and said intermediate shaft to restrict differential operation of said complex planetary gear device;
- and
- brake means for braking rotation of said restricting means;
- and wherein
- said power transmitting system is useable in a two wheel drive system, wherein when said power transmitting system is used in said two wheel drive system, said restricting means is engaged and said brake means is disengaged for forward driving of the vehicle, and respectively said restricting means is disengaged and said brake means is engaged to provide a higher speed gear ratio smaller than a smallest gear ratio of the transmission.
Dependencies are inferred from the claim text.