A transmission device includes a casing accommodating a transmission gear and having an oil sump for retaining oil. The oil in the oil sump flows from a lubrication pump through a lubrication passage and is injected to the transmission gear. A connection portion is provided in a part of the lubrication passage, which part is disposed outside the casing. A direction control valve is provided downstream of the lubrication pump and upstream of the connection portion in the lubrication passage with respect to a flow direction of the oil. The direction control valve is configured to open the lubrication passage when a hydraulic pressure in the lubrication passage exceeds a predetermined value and to close the lubrication passage when the hydraulic pressure is equal to or lower than the predetermined value.

A transmission device includes a casing accommodating a transmission gear and having an oil sump for retaining oil. The oil in the oil sump flows from a lubrication pump through a lubrication passage and is injected to the transmission gear. A connection portion is provided in a part of the lubrication passage, which part is disposed outside the casing. A direction control valve is provided downstream of the lubrication pump and upstream of the connection portion in the lubrication passage with respect to a flow direction of the oil. The direction control valve is configured to open the lubrication passage when a hydraulic pressure in the lubrication passage exceeds a predetermined value and to close the lubrication passage when the hydraulic pressure is equal to or lower than the predetermined value.

The invention relates to a gyrostabiliser assembly (1) for a marine vessel comprising: a housing (2) defining a chamber (3) for supporting at least a partial vacuum; a flywheel (4) mounted within the chamber (3) for rotation about a spin axis (Z) at the partial vacuum; a flywheel shaft (5) upon which the flywheel (4) is supported and mounted in the housing for rotation of the flywheel about the spin axis (Z), the flywheel shaft being rotatably supported by a first spin bearing (6) located at one end region of the shaft (5) and a second spin bearing (7) located at an opposite end region of the shaft (5); and a lubrication system (8) configured to circulate lubricant (O) to the spin bearings (6, 7) from a lubricant reservoir (9). The reservoir (9) is arranged in or on the housing (2) to collect lubricant from the spin bearings (6, 7) under gravity and the first and second spinbearings (6, 7) are arranged in the housing (2) for operation under the partial vacuum. The invention also relates to a vehicle, and especially a marine vessel, that includes the gyrostabiliser assembly (1).

The invention relates to a gyrostabiliser assembly (1) for a marine vessel comprising: a housing (2) defining a chamber (3) for supporting at least a partial vacuum; a flywheel (4) mounted within the chamber (3) for rotation about a spin axis (Z) at the partial vacuum; a flywheel shaft (5) upon which the flywheel (4) is supported and mounted in the housing for rotation of the flywheel about the spin axis (Z), the flywheel shaft being rotatably supported by a first spin bearing (6) located at one end region of the shaft (5) and a second spin bearing (7) located at an opposite end region of the shaft (5); and a lubrication system (8) configured to circulate lubricant (O) to the spin bearings (6, 7) from a lubricant reservoir (9). The reservoir (9) is arranged in or on the housing (2) to collect lubricant from the spin bearings (6, 7) under gravity and the first and second spinbearings (6, 7) are arranged in the housing (2) for operation under the partial vacuum. The invention also relates to a vehicle, and especially a marine vessel, that includes the gyrostabiliser assembly (1).

An electrostatic oil ring (130, 150) has an annular ring body (142, 152) with a surface (132, 134, 136, 138, 154), wherein a portion of the surface (132, 134, 136, 138, 154) carries an electrostatic coating (140, 156) which electrostatically attracts lubricant (35a) in a lubricant reservoir (35) when the electrostatic oil ring (130, 150) passes through the lubricant reservoir (35). Further, an electrostatic oil ring assembly with a plurality of electrostatic oil rings (130, 150), and a dynamoelectric machine with an electrostatic oil ring assembly are provided.

A method is disclosed that includes determining a current level of a plurality of lubricant parameters present in a portion of lubricant, comparing the current level of each of the plurality of lubricant parameters to a threshold value corresponding to each of the plurality of lubricant parameters, analyzing a priority of each of the lubricant parameters, and determining a health status of the lubricant in response to the comparing and the analyzing.

A hydraulic fracturing plan executable by a hydraulic fracturing system to hydraulically fracture a plurality of oil and gas wells.

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.

Disclosed is a method for delivering a lubrication liquid to a machine in a terminating liquid lubrication system. A machine and a cartridge containing a lubrication liquid are connected to each other so that the lubrication liquid is supplied to the machine. Some embodiments may include a monitoring system, a backup source of lubrication liquid, and/or a second cartridge that automatically provides lubrication liquid to the machine when the cartridge is empty.

Disclosed is a method for delivering a lubrication liquid to a machine in a terminating liquid lubrication system. A machine and a cartridge containing a lubrication liquid are connected to each other so that the lubrication liquid is supplied to the machine. Some embodiments may include a monitoring system, a backup source of lubrication liquid, and/or a second cartridge that automatically provides lubrication liquid to the machine when the cartridge is empty.