US 12,459,617 B2
Water jet propulsion unit for water borne craft
Richard Davies, Dunedin (NZ)
Assigned to Richard Davies, Dunedin (NZ)
Appl. No. 18/569,932
Filed by Richard Davies, Dunedin (NZ)
PCT Filed Jul. 26, 2023, PCT No. PCT/NZ2023/050071
§ 371(c)(1), (2) Date Dec. 13, 2023,
PCT Pub. No. WO2024/109064, PCT Pub. Date May 23, 2024.
Claims priority of application No. 794455 (NZ), filed on Nov. 15, 2022.
Prior Publication US 2025/0033751 A1, Jan. 30, 2025
Int. Cl. B63H 11/08 (2006.01); B63H 11/01 (2006.01); B63H 23/06 (2006.01)
CPC B63H 11/08 (2013.01) [B63H 11/01 (2013.01); B63H 23/06 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A mixed flow water jet pump comprising an intake section, mixed flow impeller housing, mixed flow impeller, stator-gearbox section, right-angle gearbox, a nozzle fixed to said stator-gearbox section, said right-angle gearbox and stator-gearbox section having a gear train where the said gear train comprises a primary input shaft coupled via two meshing bevel gears to a vertical input shaft, said vertical shaft being coupled via a mating spline to a lower shaft, said lower shaft having a gear fixed to its upper end that in turn meshes with a gear fixed to the upper end of an adjacent vertical lower shaft, and where both of the said lower shafts pass into the lower gear case through two holes in a single hydrodynamically modified stator blade, said lower shafts having bevel gears fixed to their lower ends, said bevel gears in turn meshing with two further bevel gears fixed to the impeller drive shaft and where both lower shafts transmit equal power or torque to the said impeller drive shaft, said intake section, mixed flow impeller housing, stator-gearbox section, nozzle and right-angle drive being fixed to one another.