The present invention discloses a method and device for controlling energy-saving sailing of a ship. The method comprises the steps of changing the operating parameters of the ship correspondingly when the resistance of the ship changes during routine sailing, controlling the current opening degree of a throttle to increase the instantaneous oil supply amount of a main engine of the ship if the resistance of the ship becomes smaller, and controlling the current opening degree of the throttle to reduce the instantaneous oil supply amount of the main engine of the ship if the resistance of the ship becomes larger. Compared with the prior art, the method and device have the advantages that energy waste is reduced greatly and the sailing cost is reduced.

Provided is a method for adjusting lubrication optimization of a marine main engine cylinder based on computer vision, and belongs to the technical field of marine power systems. The method includes: establishing a marine main engine lubrication database for cylinder lubrication analysis and quality evaluation; collecting cylinder lubrication data of each current cylinder, and preprocessing cylinder lubrication image set data; performing image segmentation and cluster analysis on the preprocessed cylinder lubrication image set, and comparing the preprocessed cylinder lubrication image set with the marine main engine lubrication database to obtain feature recognition results of carbon deposition, dirts, scratches and a wear degree; and according to the feature recognition results, evaluating a cylinder lubrication quality to obtain evaluation grades, and adjusting cylinder lubrication optimization according to the evaluation grades.

A marine engine has a crankcase having a crankshaft that rotates about a vertical crankshaft axis; a cover on the crankcase; and a cooling member disposed in the crankcase. The cooling member has an inner surface that faces the crankshaft and an outer surface that faces the cover. The cooling member is configured such that rotation of the crankshaft causes lubricant in the crankcase to impinge on and drain down both the inner and outer surfaces of the cooling member.

A cycloidal marine propulsion unit, including a hollow rotary casing having a central axis and defining a central inner space with an opening at an axial end thereof. A mounting body rotatably supports the rotary casing on a hull of a marine vessel. A rotating arrangement is provided for rotating said hollow rotary casing, while a plurality of blades extend axially from the rotary casing away from the hull. Each blade is mounted for pivotal movement with respect to the rotary casing, about respective blade axes. The rotating arrangement is configured to rotate the rotary casing by a circumference thereof. A blade shaft portion of each blade is at least partly received within the central inner space so as to attach said blade to the rotary casing.

Disclosed is a method of discharging lubricant oil from a BOG reliquefaction system configured to reliquefy BOG by compressing the BOG by a compressor, cooling the compressed BOG through heat exchange with non-compressed BOG by a heat exchanger, and reducing a pressure of fluid cooled through heat exchange by a pressure reducer. In the lubricant oil discharge method, the compressor comprises at least one oil-lubrication type cylinder and it is determined that it is time to discharge condensed or solidified lubricant oil, if at least one of preset conditions is satisfied.

A propeller drive assembly includes a driveshaft for transferring a torque between an engine and a propeller of a water surface vessel, and a housing enclosing the driveshaft. The assembly includes, separately from the driveshaft, a first element and a second element, the first element extending through a first bore of the second element, wherein one of the first and second elements is fixed to the driveshaft and the other of the first and second elements is arranged to be stationary in relation to the housing, and the one of the first and second elements which is fixed to the driveshaft presents in the first bore a first elongated cavity forming a first helix along the first bore, so as to form with the other of the first and second elements a screw pump.

A fluid transportation apparatus includes a first suction pipe having a first intake opening and a second suction pipe having a second intake opening. The first and second suction pipes are attached to a vessel on opposite sides to move in rolling motion. The first intake opening is disposed in a fluid reservoir at a position lower than the second intake opening and a valve device moves toward a maximally opened position for a first proximal end of the first suction pipe and to move toward a maximally closed position for a second proximal end of the second suction pipe, as the first and second suction pipes move with the vessel in a first rolling direction of the rolling motion. The intake openings reverse roles and the proximal ends reverse roles, as the vessel moves in a second rolling direction of the rolling motion opposite from the first rolling direction.

The present invention relates to a marine drive unit (1) comprising an upper bevel gear set (2) and a lower bevel gear set (3). The upper bevel gear set (2) is connected to the lower bevel gear set (3) by a drive shaft (4) which extends in vertical direction. A first oil pump (5) is arranged to supply oil to the upper bevel gear set (2) and a second oil pump (6) is arranged to feed a cooling oil circuit.

A lubricating oil composition comprises 50 mass % or more of an oil of lubricating viscosity and 0.1 to 25 mass % of at least one of compounds of structures (I), (II), or (III). ##STR00001## wherein X.sup.1 and X.sup.2 are the same or different and are OH, NH.sub.2 or SH; wherein groups R.sup.1 and R.sup.2 are the same or different and are linear or branched, saturated or unsaturated hydrocarbon groups having from 1 to 50 carbon atoms, with the proviso that at least one of groups R.sup.1 and R.sup.2 has at least 4 carbon atoms; and wherein m and n are the same or different and are zero or an integer from 1 to 3 with the proviso that m and n are not both zero. The compositions are useful to ameliorate or prevent deposits in engines and provide good asphaltene dispersancy.

An oil guide member is used for an outboard motor capable of switching a disposition between a first disposition that is a disposition of the outboard motor at the time of navigation of a marine vessel and a second disposition in which a rear side is lifted further upward than the first disposition. The oil guide member guides oil for lubrication to a lubricated portion. The oil guide member includes a discharge hole and an oil accumulation part. The discharge hole is arranged at a position that enables dropping of the oil to the lubricated portion in a state of the first disposition. The oil accumulation part enables accumulation of the oil in a state of the second disposition and is capable of draining the accumulated oil to the discharge hole in the state of the first disposition.