Patent ID: 6053835
Filing Date: 2000-04-25
Classification: F16H

Abstract:
A differential gear lubrication structure for a differential gear comprising a differential gear case having a pair of boss parts for axial support of a pair of output shafts disposed coaxially with each other, a pair of drive pinions combined respectively with the output shafts by means of splines, a plurality of differential pinions engaging with the drive pinions, and pinion shafts supported by the differential gear case to axially support the differential pinions, said lubrication structure comprising:an oil sump disposed at an outer end of the boss part to supply lubricating oil;a first lubricating oil path being formed between an inner circumferential surface of the boss part and the output shaft;a second lubricating oil path being formed between an inner circumferential surface of the drive pinion and the output shaft, wherein the lubricating oil from the oil sump is supplied to a space between pair of the drive pinions via said first lubricating oil path and said second lubricating oil path;a tubular member having shaft insertion holes for insertion of the pinion shafts being provided between pair of the driving pinions; anda first lubrication groove being formed on an inner circumferential surface of said tubular member for leading the lubricating oil from said second lubricating oil path to the shaft insertion hole.