Patent ID: 7625308

Claim:
A differential gear comprising: a case, a pinion gear, and a side gear, said side gear including side gear teeth engaging pinion gear teeth of said pinion gear, said side gear engaging an inner pawl of a first clutch plate integrally rotating with the side gear, and engaging with an outer pawl of a second clutch plate integrally rotating with the case, and having a differential limiting function, wherein said side gear is provided with communication paths of a lubricating oil, said communication paths comprising main communication paths and radial communication paths, said main communication paths extending in an axial direction are formed in a middle portion of the side gear in a radial direction and first openings thereof are open to a bottom of the side gear teeth, said radial communication paths extending in an outward direction of said side gear in a radial direction from said main communication paths are formed and second openings thereof are open to portions at which said side gear engages with an inner pawl of said first clutch plate, the lubricating oil in the case is supplied into said main communication paths by pumping action in an engagement portion between said side gear and said pinion gear, and the lubricating oil in said main communication paths is supplied to the clutch plate from said radial communication paths by centrifugal force generated by a rotation of said side gear.