초록 ▼

A power transfer system is disclosed for a four-wheel drive vehicle operable for permitting a vehicle operator to select between various full-time and part-time four-wheel drive modes. The power transfer system includes a transfer case equipped with a dual-planetary gear reduction unit and a synchro

A power transfer system is disclosed for a four-wheel drive vehicle operable for permitting a vehicle operator to select between various full-time and part-time four-wheel drive modes. The power transfer system includes a transfer case equipped with a dual-planetary gear reduction unit and a synchronized range shift mechanism operable for permitting the vehicle operator to shift on-the-fly for establishing full-time and part-time high-range and low-range four-wheel drive modes. The transfer case is also equipped with an electronically-controlled slip limiting/torque-biasing arrangement including an interaxle differential and a transfer clutch operable for controlling the magnitude of speed differentiation and torque biasing across the interaxle differential.

대표청구항 ▼

[ What is claimed is:] [1.] A power transfer system for a four-wheel drive motor vehicle having a power source and front and rear drivelines, comprising:a transfer case including a housing; an input shaft rotatably supported in said housing and driven by the power source; a front output shaft rotata

[ What is claimed is:] [1.] A power transfer system for a four-wheel drive motor vehicle having a power source and front and rear drivelines, comprising:a transfer case including a housing; an input shaft rotatably supported in said housing and driven by the power source; a front output shaft rotatably supported in said housing and coupled to the front driveline; a rear output shaft rotatably supported in said housing and coupled to the rear driveline; a mainshaft; a dual-planetary gear reduction unit operable for selectively coupling said input shaft to said mainshaft to define a high-range drive mode in which said mainshaft is driven at a direct speed ratio relative to said input shaft and a low-range drive mode in which said mainshaft is driven at a reduced speed ratio relative to said input shaft, said dual-planetary gear reduction unit having a first sun gear driven by said input shaft, a second sun gear, and a carrier assembly driving said mainshaft and having planet gears journally supported thereon intermeshed with said first and second sun gears; a range actuator, a first clutch that can be selectively actuated by said range actuator for coupling said input shaft to said carrier assembly to establish said high-range drive mode; a second clutch that can be selectively actuated by said range actuator for coupling said second sun gear to said housing to establish said low-range drive mode; and an interaxle differential interconnecting said mainshaft to said front and rear output shafts for permitting speed differentiation therebetween to define a full-time four-wheel high-range drive mode and low range drive mode, said interaxle differential including an input driven by said mainshaft, a first output interconnecting said input to said front output shaft, and a second output interconnecting said input to said rear output shaft; anda mode select mechanism operably connected to said range actuator for enabling a vehicle operator to select one of said full-time four-wheel high-range drive mode and said full-time four-wheel low-range drive mode.