Patent ID: 7134277

Claim:
A driving force distribution apparatus for transmitting a driving force from an engine to right and left axles, comprising: a differential unit for distributing and transmitting the driving force from the engine to the right and left axles; a hydraulic motor having a case and a cylinder block, said case connecting with one of the right and left axles, and said cylinder block connecting with the other of the right and left axles for applying relative forces to the right and left axles; a hydraulic axial pump having a case, a cylinder block, a swash plate and a swash plate tilting means, said case having two ports, said cylinder block being rotated by a power from the engine and said swash plate being controlled by said swash plate tilting means; and a control valve being equipped between said pump and said motor for hydraulically connecting said pump and said motor; wherein said swash plate tilting means tilts and holds said swash plate to the one side when said cylinder block of said hydraulic pump rotates in a forward direction, and tilts and holds the swash plate to the other side when said cylinder block of said hydraulic pump rotates in a reverse direction so that the one port is always a suction port and the other port is always an exhaust port irrespective of rotating direction.