Patent ID: 8900081

Claim:
A vehicle power switching device comprising: a power transmission unit including an input shaft adapted to be driven by a vehicle power to rotate, an output shaft aligned with and spaced apart from said input shaft, a first coupler sleeved movably on one of said input shaft and said output shaft, a differential driven by said output shaft, an axle aligned with said differential, and a second coupler sleeved movably on one of said differential and said axle and movable to interconnect said differential and said axle; and a driving unit including a controller, a first transmission mechanism driven by said controller, and a second transmission mechanism driven by said first transmission mechanism, said controller being operable to activate said first transmission mechanism to thereby move said first coupler among a two-wheel drive position, a four-wheel drive position, and a differential locking position such that, when said first coupler is at the two-wheel drive position, said first coupler is sleeved on only the one of said input shaft and said output shaft, so that said input shaft is disconnected from said output shaft; when said first coupler is at the four-wheel drive position, said first coupler is sleeved on said input shaft and said output shaft to allow for co-rotation of said input shaft and said output shaft, and said differential is disconnected from said axle; and when said first coupler is moved from the four-wheel drive position to the differential locking position, said second transmission mechanism is driven by said first transmission mechanism to move said second coupler to interconnect said differential and said axle, so as to allow for co-rotation of said axle with said differential, said first transmission mechanism including a movable rod driven by said controller, a driving rod connected fixedly to said movable rod, a push rod spaced apart from said driving rod and movable to activate said second transmission mechanism, a sleeve permitting said push rod to extend therethrough, a sleeve-pushing member disposed fixedly on said driving rod and sleeved rotatably on said sleeve, a first-coupler pushing member sleeved movably on said sleeve and connected to and co-movable with said first coupler, a first returning member for biasing said push rod to return to an original position, and a force-storing resilient member for biasing said first-coupler pushing member to move on said sleeve so as to move said first coupler to the four-wheel drive position.