Provided is a grease collection arrangement for collecting waste grease from a grease lubricated rotor blade pitch bearing of a wind turbine, whereby the grease collection arrangement includes at least one waste grease collector and multiple extraction tubes, wherein each one of the multiple extraction tubes is connected to the at least one waste grease collector and the multiple extraction tubes are configured to being connected to multiple grease outlets of the rotor blade pitch bearing, whereby the grease collection arrangement is configured such that the waste grease from the rotor blade pitch bearing can flow into the at least one waste grease collector by gravity and centrifugal forces.

A lubricating system that includes a manifold with one or more manifold ports that permit a flow of lubricant through the manifold. The manifold is configured for removable attachment to another manifold such that any number of manifold can be joined together. An ejector is removably attached to the manifold. The ejector has one or more projections configured for insertion into each of the one or more manifold ports in the manifold, such that the ejector is configured to receive the flow of lubricant from the manifold, via the one or more projections, and to discharge lubricant periodically, or at preset intervals, from one or more outlet ports of the ejector. A locking key is disposed between the manifold and ejector. The locking key is configured such that movement of the locking key attaches or detaches the ejector from the manifold.

A lubricating system that includes a manifold with one or more manifold ports that permit a flow of lubricant through the manifold. The manifold is configured for removable attachment to another manifold such that any number of manifold can be joined together. An ejector is removably attached to the manifold. The ejector has one or more projections configured for insertion into each of the one or more manifold ports in the manifold, such that the ejector is configured to receive the flow of lubricant from the manifold, via the one or more projections, and to discharge lubricant periodically, or at preset intervals, from one or more outlet ports of the ejector. A locking key is disposed between the manifold and ejector. The locking key is configured such that movement of the locking key attaches or detaches the ejector from the manifold.

An oil supply structure which supplies lubricating oil to a portion to be lubricated in a casing, the oil supply structure comprises an opening portion provided on a wall portion of the casing which corresponds to a shaft end portion of a rotary shaft supported by a bearing in the casing, and an oil passage configured to provide communication from the opening portion to at least the bearing.

An oil supply structure which supplies lubricating oil to a portion to be lubricated in a casing, the oil supply structure comprises an opening portion provided on a wall portion of the casing which corresponds to a shaft end portion of a rotary shaft supported by a bearing in the casing, and an oil passage configured to provide communication from the opening portion to at least the bearing.

A self-cooling fluid storage container includes a reservoir to store a fluid at a level that allows for an air space above the fluid. The fluid enters the reservoir. A fluid conduit receives the fluid at a fluid input opening to an internal fluid conduit that extends upward towards the air space. A heat exchanger portion extends sufficiently near the air space to provide a thermal exchange with the air space. The heat exchanger receives fluid to provide a cooling of the air space. The internal fluid conduit continues extending downward from the air space to a fluid output opening for distribution to a system that uses the fluid.

A self-cooling fluid storage container includes a reservoir to store a fluid at a level that allows for an air space above the fluid. The fluid enters the reservoir. A fluid conduit receives the fluid at a fluid input opening to an internal fluid conduit that extends upward towards the air space. A heat exchanger portion extends sufficiently near the air space to provide a thermal exchange with the air space. The heat exchanger receives fluid to provide a cooling of the air space. The internal fluid conduit continues extending downward from the air space to a fluid output opening for distribution to a system that uses the fluid.

A wind turbine drive train component (22) comprising a rotating shaft (61) with a radial seal (50) is provided. The radial seal (50) comprises a stationary part and a rotating part. The stationary part comprises a ring (51) with an inner edge and an outer edge, the inner edge being configured for contactlessly surrounding the shaft (61). The rotary part comprising a disc (52), coaxially connected to the shaft (61) for rotation therewith and comprising a flange (53) that wraps around the outer edge of the ring (51). The radial seal (50) further comprises an annular air lock gap (55) for containing an amount of lubrication fluid (64) and thereby closing off the air lock gap (55) when the rotary part rotates at a rotational speed above a predetermined threshold speed, the annular air lock gap (55) being formed by an inner surface of the flange (53), an outer part of the opposing parallel surface of the disc (52) and the outer edge of the ring (51).

A wind turbine drive train component (22) comprising a rotating shaft (61) with a radial seal (50) is provided. The radial seal (50) comprises a stationary part and a rotating part. The stationary part comprises a ring (51) with an inner edge and an outer edge, the inner edge being configured for contactlessly surrounding the shaft (61). The rotary part comprising a disc (52), coaxially connected to the shaft (61) for rotation therewith and comprising a flange (53) that wraps around the outer edge of the ring (51). The radial seal (50) further comprises an annular air lock gap (55) for containing an amount of lubrication fluid (64) and thereby closing off the air lock gap (55) when the rotary part rotates at a rotational speed above a predetermined threshold speed, the annular air lock gap (55) being formed by an inner surface of the flange (53), an outer part of the opposing parallel surface of the disc (52) and the outer edge of the ring (51).

The present disclosure relates to an arrangement for transferring fluid to a guide bar in a chain saw. A channel can extend from a chain saw body to the fastening arrangement of the guide bar. The channel can include a cavity through the entire channel, a first end of the cavity being connected to a feed channel provided in the chain saw body and a second end thereof to a counter channel provided in the fastening arrangement. The counter channel, in turn, is arranged to extend to the guide bar. The channel is thus arranged to guide fluid flowing in the feed channel provided in the chain saw body through the channel and further through the counter channel provided in the fastening arrangement to the guide bar.