Gyrostabiliser assembly

A gyrostabiliser assembly for a marine vessel comprising:

• a housing defining a chamber for supporting at least a partial vacuum;
• a flywheel mounted within the chamber for rotation about a spin axis at the partial vacuum;
• a flywheel shaft upon which the flywheel is supported and mounted in the housing for rotation of the flywheel about the spin axis, the flywheel shaft being rotatably supported by a first rotary bearing located at one end region of the shaft and a second rotary bearing located at an opposite end region of the shaft;
• and a lubrication system configured to supply lubricant to the spin bearings from a lubricant reservoir, wherein the reservoir is arranged in or on the housing to collect lubricant from the rotary bearings under gravity, and the first and second rotary bearings are arranged in the housing for operation under the partial vacuum.

A marine vessel, especially a boat or motor yacht, comprising a gyrostabiliser assembly including:

• a housing defining a chamber for supporting an operating pressure;
• a flywheel mounted within the chamber for rotation about a spin axis at the operating pressure;
• a flywheel shaft upon which the flywheel is supported and mounted in the housing by first and second spin bearings located at opposite end regions of the shaft for rotation of the flywheel about the spin axis;
• and
• a lubrication system for the first and second spin bearings configured to supply lubricant to the spin bearings from a reservoir, wherein the reservoir is arranged in or on the housing to collect the lubricant from the first and second spin bearings under gravity, and wherein the first and second spin bearings are arranged in the housing to be at the operating pressure.