Output gear of automatic transmission

Claim 1

An automatic transmission for a front engine, front wheel drive vehicle, comprising: a torque converter; a main power train comprising a rotatory terminal member, said main power train being connected with said torque converter for transmitting a driving torque from said torque converter to said terminal member; housing means enclosing said main power train, said housing means having a cylindrical bore and at least one oil feed passage opening in a clyindrical surface of said bore, and an output gear rotatably supported by said housing means and connected detachably with said terminal member of said main power train for transmitting the driving torque from said main power train to front wheels of the vehicle, said main power train being placed between said torque converter and said output gear, said output gear having a hub which is splined detachably to said terminal member, and which is fitting in said bore of said housing means in such a manner that said hub can rotate in said bore, said hub having an annular groove formed on an outer cylindrical surface of said hub, said output gear being formed with lubricating means extending from said annular groove for conveying oil from said annular groove, said oil feed passage of said housing means opening into said annular groove for supplying oil into said lubricating means through said annular groove, said annular groove having sufficient depth and width within a range permitted by a strength of said hub to prevent a shortage of the oil supply through said annular groove to said lubricating means due to a centrifugal force of the oil rotating in said annular groove together with walls of said annular groove.