Differentialvorrichtung mit Schmierölnuten

摘要

A differential apparatus comprises a: differential casing rotated by an engine power; a plurality of pinion gears slidably housed in accommodation holes formed in the differential casing; a pair of side gears geared with each other via the pinion gears, two opposing end surfaces thereof being slid each other directly or via a thrust washer; and a block member interposed between two inner circumferential surfaces of the two side gears so as to center the side gears, respectively. In particular, at least one oil sump is formed between the block member and the side gears, to supply lubricant to sliding portions between the block member and the side gears and between two opposing end surfaces of the two side gears, by a centrifugal force generated by the rotating differential casing. Further, it is preferable to further form at least one central oil passage at the centering portion so as to extend from an inner circumferential side to an outer circumferential side of the boss portions of the two side gears. Further, it is also preferable to form at least two radial oil passages, between inner wall surfaces of the differential casing and the side gears, respectively in such a way that a radially inward end thereof communicates with the helical oil passage and a radially outward end thereof communicates with sliding portion between the side gear and the differential casing, respectively.