Patent ID: 8002660

Claim:
A vehicular automatic transmission comprising: a first rotary shaft and a second rotary shaft which are coaxial with each other and which are splined to each other at their adjacent axial end portions to be rotated together; a lubrication system including: a first lubrication passage and a second lubrication passage which are respectively formed through said first and second rotary shaft so as to extend in an axial direction of the rotary shafts and which are held in communication with each other through said adjacent axial end portions; a plurality of oil outlet holes which are held in communication with said first and second lubrication passages and which are spaced apart from each other in said axial direction, so that a lubricating oil introduced into said first and second lubrication passages is delivered through said oil outlet holes radially outwardly of said first and second shafts, to corresponding lubricated parts of the automatic transmission; and a first oil inlet hole and a second oil inlet hole formed through said first and second rotary shafts, respectively, such that said plurality of oil outlet holes are located between said first and second oil inlet holes and said adjacent axial end portions of said first and second rotary shafts, so that the lubricating oil introduced into said first and second lubrication passages through said first and second oil inlet holes, respectively, flows through said first and second lubrication passages toward said adjacent axial end portions.