A shaft seal includes a shaft engaging portion configured to couple to a shaft extending through a wall. The shaft seal includes a flange configured to sealingly engage the wall. The shaft seal includes a body extending between the shaft engaging portion and the flange. The seal is configured to allow radial and axial movement of the shaft relative to the wall while maintaining a seal between the flange and the wall.

A protective device for a stern tube seal of a propeller-driven vessel, wherein an intermediate space is left open between a stern tube and a propeller hub, which intermediate space is covered by a tubular protective cover concentric with the propeller hub, which protective cover is fixedly anchored to the stern tube and axially overlies the propeller hub leaving an annular gap, wherein a ring concentric with the propeller hub and U-shaped in radial section is disposed inside the protective cover in the intermediate space between the stern tube and the propeller hub, the U-opening of which ring is directed radially outward, and wherein the ring is at least partially formed of a material that has a pourable consistency at 20° C.

This propulsion unit for an aquatic vehicle consists of a mobile casing mounted in a pivot connection in relation to a hull element of the aquatic vehicle, a drive shaft of a propeller, said shaft being mounted rotatably within the mobile casing by means of at least one bearing consisting of a closed space adapted to be filled with a hydraulic fluid, an electrical machine being adapted to drive the rotary drive shaft in relation to the mobile casing, where the propulsion unit further consists of a module for conditioning the hydraulic fluid contained in the closed space of the bearing. The propulsion unit also consists of a control device to control the conditioning, the control device consisting of a temperature sensor and capable of activating the conditioning of the hydraulic fluid contained in the closed space according to the temperature measured by the temperature sensor.

A thrust bearing configured to support axial loads that act on a rotating body includes a thrust shaft rotatably supportable in a bearing housing, a thrust collar, and a retainer connected to the thrust shaft and configured to support a plurality of thrust pieces. The thrust pieces each have a front sliding surface in sliding contact with the thrust collar, and the retainer includes a disk having a central opening and an outer circumference and a plurality of radial incisions extending radially inwardly from the outer circumference which incisions have inner ends radially spaced from the central opening. The radial incisions define circumferentially adjacent spring sections each of the which is individually axially flexible against and away from the bearing housing to open and close a spring gap between each of the spring sections and the bearing housing.

Turning gear apparatus (10) for rotating a shaft (11) comprises a rotary drive arrangement (12) and a transmission system including a pivot arm (20). The rotary drive arrangement (12) is fixed, for example to a vessel hull (14), and the pivot arm (20) is pivotable between a first, shaft-disengaged, position and a second, shaft-engaged position where the rotary drive arrangement (12) is operably coupled to the shaft (11), thereby permitting control over rotation of the shaft (11) by the rotary drive arrangement (12).

Turning gear apparatus (10) for rotating a shaft (11) comprises a rotary drive arrangement (12) and a transmission system including a pivot arm (20). The rotary drive arrangement (12) is fixed, for example to a vessel hull (14), and the pivot arm (20) is pivotable between a first, shaft-disengaged, position and a second, shaft-engaged position where the rotary drive arrangement (12) is operably coupled to the shaft (11), thereby permitting control over rotation of the shaft (11) by the rotary drive arrangement (12).

A sealing system for sealing a shaft located under water includes a bush mountable on the shaft and fixed to the shaft, a housing fixed with respect to the bush and surrounding a first portion of the bush, a lubricant chamber and an air chamber in the housing and open to the bush, the lubricant chamber being sealed with respect to the air chamber by a seal ring, a mechanical seal outside the housing and surrounding a second portion of the bush, an air supply line and an air discharge line connected to the air chamber, and a quantity of lubricating oil in the lubricant chamber, the lubricating oil being in fluid communication with a lubricant tank via at least one oil line, wherein an air pressure in the air chamber is greater than an oil pressure in the lubricant chamber.

A wheel-legged amphibious mobile robot with a variable attack angle, which belongs to the technical field of robot structure technology. The robot includes three parts: motion unit, body trunk and power unit. As a key structure, the motion unit mainly includes a moving mechanism, a wheel assembly, a telescopic mechanism and a transmission device. The robot drives the telescopic mechanism to reciprocate linearly through a gear and rack set, and pushes “legs” to expand and retract, so as to realize a mutual switching between a wheeled mode and a gait mode. Under transmission of bevel gear set, the blades can rotate at any same angle at the same time, to change the attack angle and realize the steering. The robot provided by the present disclosure can effectively adapt to a complex and harsh amphibious environment, and meet a series of operation requirements such as rapid movement, obstacle climbing, underwater steering.

A wheel-legged amphibious mobile robot with a variable attack angle, which belongs to the technical field of robot structure technology. The robot includes three parts: motion unit, body trunk and power unit. As a key structure, the motion unit mainly includes a moving mechanism, a wheel assembly, a telescopic mechanism and a transmission device. The robot drives the telescopic mechanism to reciprocate linearly through a gear and rack set, and pushes “legs” to expand and retract, so as to realize a mutual switching between a wheeled mode and a gait mode. Under transmission of bevel gear set, the blades can rotate at any same angle at the same time, to change the attack angle and realize the steering. The robot provided by the present disclosure can effectively adapt to a complex and harsh amphibious environment, and meet a series of operation requirements such as rapid movement, obstacle climbing, underwater steering.

An outboard propulsion system comprising an engine configured to receive oil; an oil pan configured to receive oil from the engine; and an oil reservoir configured to receive oil from the oil pan and provide oil to the engine, in use.