Outboard drive transmission

A transmission for a watercraft outboard drive, said transmission comprising first and second counter-rotating gears, at least one of said gears including a hollow bearing hub, and a clutch which is at least partially positioned within said hub, said clutch adapted to move within said hub from an engagement position in which said clutch engages said gear to a non-engagement position in which said clutch does not engage said gear.

A compacted transmission for a watercraft outboard drive, said transmission comprising first and second counter-rotating gears, a first clutch connected to a first propulsion shaft and adapted to selectively engage at least said first gear, and a second clutch coupled to said first clutch and connected to a second propulsion shaft, said second clutch adapted to selectively engage at least said second gear, said first and second propulsion shafts extending in an axial direction, at least one of said gears and at least one of said clutches overlapping with each other in said axial direction so as to reduce an overall length of said transmission in said axial direction.

An outboard drive for a watercraft comprising coaxial propulsion shafts which extend in a rearward direction from a transmission, said transmission comprising a front rotating gear and a rear counter-rotating gear, said rear gear having at least one clutch element, and a clutching mechanism comprising a movable first clutching element positioned on the rear side of said clutch element of said rear gear, said clutching mechanism being configured to selectively couple said propulsion shafts with said gears to simultaneously drive said propulsion shafts in opposite directions relative to each other under a first drive condition, and to couple one of said propulsion shafts with one of said gears under a second drive condition, said clutching mechanism being arranged forward of a rear end of said rear gear of said transmission.

An outboard drive for a watercraft comprising an inner propulsion shaft and a hollow outer propulsion shaft which are positioned coaxially with each other, and a transmission including front and rear counter-rotating gears, and a clutching mechanism which selectively couples said gears with said propulsion shafts, said clutching mechanism comprising a first clutching element interposed between said front and rear gears and connected to said inner propulsion shaft, and a second clutching element positioned on a side of said rear gear opposite of said first clutching element, said second clutching element connected to said outer propulsion shaft, said outer propulsion shaft being arranged to extend forward of a rear end of said rear transmission gear.