US 11,052,983 B2
Marine propulsion system
John Carter, St. Martin (GB)
Assigned to DUODRIVE LIMITED, Tunbridge Wells (GB)
Appl. No. 16/305,560
Filed by DUODRIVE LIMITED, Tunbridge Wells (GB)
PCT Filed Jun. 8, 2017, PCT No. PCT/GB2017/051665
§ 371(c)(1), (2) Date Nov. 29, 2018,
PCT Pub. No. WO2017/212274, PCT Pub. Date Dec. 4, 2017.
Claims priority of application No. 1610020 (GB), filed on Jun. 8, 2016.
Prior Publication US 2020/0324869 A1, Oct. 15, 2020
Int. Cl. B63H 21/30 (2006.01); B63H 23/32 (2006.01); B63H 23/10 (2006.01)
CPC B63H 23/10 (2013.01) [B63H 21/30 (2013.01); B63H 23/321 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A marine propulsion system comprising:
a boat having a recess formed along an external surface of a hull of the boat, wherein the boat has an engine; and
a drive cassette comprising:
a housing;
a static tube fixably attached to the housing and extending rearwardly from the housing;
and
a drive shaft extending through the static tube and into the housing;
wherein the drive shaft is rotatably supported by a shaft bearing within the static tube, wherein the drive shaft is rotatably supported by a pair of thrust bearings disposed within the housing outside the hull and configured to transfer axial thrust from the drive shaft to the housing;
wherein the static tube, the drive shaft, the shaft bearing, and the pair of thrust bearings are coaxially aligned with each other;
wherein the housing is seated in the recess and an end of the driveshaft is coupled to the engine of the boat.