Back to results
US 2003/0194925 A1Published application
Stator vane and impeller-drive shaft arrangements and personal watercraft employing the same
AssigneeBombardier Recreational Products Inc.
InventorsGaetan Lecours, Patrice Dusablon, Gilles Pesant
Life of this patent
Estimating the term…
Abstract
The invention is directed to a thick stator vane that effects continuous acceleration of the water stream within the jet pump, a non-uniform spacing of stator vanes or impeller blades to reduce noise output of the jet pump during operation, and a coupling structure positioned between the impeller and engine that prevents transfer of axial thrust to the engine caused by jet pump failure.
Claims21
A jet pump for a watercraft comprising:
- a generally cylindrical housing;
- an impeller having a hub, a plurality of impeller blades mounted on said hub, and a shaft extending from said hub for connection to a rotatable drive shaft, said impeller being disposed within said housing so as to rotate within said housing when driven by the rotatable drive shaft;
- a stator having a plurality of vane structures extending generally radially outwardly therefrom and extending axially therealong, said impeller being rotationally connected to said stator to allow relative movement therebetween;
- and
- a coupling structure coupled to said shaft, wherein said coupling structure has an elongated configuration including a socket having a mouth configured to receive the drive shaft and a bore disposed on an opposite side of the socket than said mouth so as to allow relative axial movement between said impeller and the drive shaft.
2 more elements
A jet pump for a watercraft comprising:
- a generally cylindrical housing having a forward portion and a rearward portion thereof;
- an impeller having a plurality of impeller blades mounted thereon, said impeller being disposed within said forward portion of said housing and being configured to be connected to a rotatable shaft so as to be rotatable within said housing;
- a stator fixedly mounted within said housing adjacent to and rearward of said impeller, said stator having a plurality of circumferentially spaced first vane structures extending generally radially outwardly therefrom, extending axially along said stator, and tapered in width axially toward said impeller;
- a pump cover being fixedly mounted to a rearward side of said stator and having a plurality of circumferentially spaced second vane structures extending generally radially outwardly therefrom, extending axially along said pump cover, and tapered in width opposite said first vane structures,
- wherein each of said plurality of first vane structures abuts a respective one of said plurality of second vane structures, said pluralities of abutting first and second vane structures defining a plurality of stator vanes extending axially along said stator and said pump cover and being positioned rearward of said impeller.
2 more elements
A jet pump for a watercraft comprising:
- a generally cylindrical housing having a forward portion and a rearward portion thereof;
- an impeller having a plurality of impeller blades mounted thereon, said impeller being disposed within said forward portion of said housing and being configured to be connected to a rotatable shaft so as to be rotatable within said housing;
- a stator fixedly mounted within said housing adjacent to and rearward of said impeller, said impeller being configured to be rotationally coupled to said stator to allow relative rotational movement therebetween, said stator having a plurality of circumferentially spaced vanes extending generally radially outwardly therefrom and extending axially along said stator, each of said vanes having a thickened intermediate section disposed between a pair of opposed ends that taper from the thickened intermediate section.
A stator for use in a jet pump having an impeller rotatably coupled with respect to the stator, comprising:
- a central hub portion;
- and
- a plurality of stator vanes extending outward from the central hub portion arranged with irregular spacing between adjacent vanes, such that at least one stator vane is spaced from an adjacent stator vane a different distance than that stator vane is spaced from its other adjacent stator vane.
An impeller for use in a jet pump having a stator fixed with respect to the impeller, comprising:
- a central hub portion connected to a drive assembly to rotate the central hub portion;
- and
- a plurality of impeller blades extending outward from the central hub portion arranged with irregular spacing between adjacent blades, such that at least one impeller blade is spaced from an adjacent impeller blade a different distance than that impeller blade is spaced its other adjacent impeller blade.
Dependencies are inferred from the claim text.