POWER CUT-OFF DEVICE OF A FOUR-WHEEL DRIVE VEHICLE FOR PULLING VEHICLES WITH LIFTING FRONT WHEELS THEREOF AND PREVENTING DAMAGES OF A VISCOUS COUPLING AND A TRANSMISSION BY CUTTING OFF POWER TRANSMITTED TO REAR WHEELS

摘要

PURPOSE: A power cut-off device of a four-wheel drive vehicle is provided to prevent breakdown of a transmission and a viscous coupling caused by traction by installing a power cut-off unit for transmitting and releasing power from the front part to the rear part. CONSTITUTION: A power cut-off device of a four-wheel drive vehicle is composed of a front propeller shaft(12) connected to an engine through a viscous coupling to receive power of the engine; a rear propeller shaft(13) linked to rear wheels to transmit the power to the rear wheels; an intermitting mechanism(25) installed between the front and rear propeller shafts to cut off transmission of the power between the front and rear propeller shafts; and an actuating mechanism(35) for operating the intermitting mechanism in pulling the vehicle. The intermitting mechanism comprises a driving gear(20) disposed in the end portion of the front propeller shaft; a driven gear(22) arranged oppositely to the driving gear at a predetermined gap and mounted in the end portion of the rear propeller shaft; and a sleeve(24) disposed between the driving and driven gears to slide and to connect or release the driving and driven gears.