A turbine, wherein a propeller is mounted to said turbine, rotatable around a propeller axis, wherein a multi piston pump is provided, said multi piston pump being drivable by said propeller for pressurizing a pumping fluid, wherein the multi piston pump comprises a central part and a drive ring extending around the central part, wherein the central part comprises a series of piston-cylinder assemblies which are each compressible and extendible in a respective radial direction with respect to a common central axis, wherein each of the piston-cylinder assemblies is directly or indirectly engageable by the drive ring for radial compression thereof, in particular for pressurizing said pumping fluid, wherein at least one of the piston-cylinder assemblies is provided with a hydraulic and/or pneumatic biasing means for biasing, at least selectively biasing, at least part of that piston-cylinder assembly towards engagement with the drive ring, in particular substantially independent of and/or complementary to a biasing by a pressure of pumping fluid at that piston-cylinder assembly.

A turbine, wherein a propeller is mounted to said turbine, rotatable around a propeller axis, wherein a multi piston pump is provided, said multi piston pump being drivable by said propeller for pressurizing a pumping fluid, wherein the multi piston pump comprises a central part and a drive ring extending around the central part, wherein the central part comprises a series of piston-cylinder assemblies which are each compressible and extendible in a respective radial direction with respect to a common central axis, wherein each of the piston-cylinder assemblies is directly or indirectly engageable by the drive ring for radial compression thereof, in particular for pressurizing said pumping fluid, wherein at least one of the piston-cylinder assemblies is provided with a hydraulic and/or pneumatic biasing means for biasing, at least selectively biasing, at least part of that piston-cylinder assembly towards engagement with the drive ring, in particular substantially independent of and/or complementary to a biasing by a pressure of pumping fluid at that piston-cylinder assembly.

The present invention relates to a gas supply pump comprising: a camshaft which can be rotated; a plurality of cam noses provided at regular intervals in a lengthwise direction of the camshaft and having an eccentric shape from the center of the camshaft; a cam roller provided to be in close contact with each cam nose; and a drive shaft and a piston provided to neighbor with one side of the cam roller; and a liquefied gas compression device which pressurizes and exhausts a liquefied gas according to a straight reciprocation of the piston.

Embodiments of the invention provide a pump assembly for a hydraulic tool. The pump assembly can include a reciprocating element that is configured to move between a retracted position and an extended position, a cam surface in the reciprocating element that can engage cam followers, a rotating element that can receive rotational input, and a base that can at least partially surrounds the rotating element. Movement of the cam followers along the cam surface can move the reciprocating element from the retracted position to the extended position.

Embodiments of the invention provide a pump assembly for a hydraulic tool. The pump assembly can include a reciprocating element that is configured to move between a retracted position and an extended position, a cam surface in the reciprocating element that can engage cam followers, a rotating element that can receive rotational input, and a base that can at least partially surrounds the rotating element. Movement of the cam followers along the cam surface can move the reciprocating element from the retracted position to the extended position.

An axial pump assembly for a hydraulic tool includes a cycloidal disk rotatable about an axis and having an eccentric opening configured to receive a rotational input. A ring defines a cam track and is engaged with the cycloidal disk so that rotation of the cycloidal disk causes corresponding rotation of the ring about the axis. A plate includes a follower that engages with the cam track so that rotation of the cam track causes corresponding reciprocating motion of the plate along the axis.

An axial pump assembly for a hydraulic tool includes a cycloidal disk rotatable about an axis and having an eccentric opening configured to receive a rotational input. A ring defines a cam track and is engaged with the cycloidal disk so that rotation of the cycloidal disk causes corresponding rotation of the ring about the axis. A plate includes a follower that engages with the cam track so that rotation of the cam track causes corresponding reciprocating motion of the plate along the axis.

A gas supply pump for a ship dual fuel engine is described. The gas supply pump includes a rotatable camshaft, a plurality of cam noses arranged at regular intervals along a lengthwise direction of the camshaft, a cam roller in close contact with each cam nose, a drive shaft and a piston adjacent to each other on one side of the cam roller, a liquefied gas compression device to compress and discharge liquefied gas by a linear reciprocating motion of the piston, a coupling case at a coupled part of the drive shaft and the piston, a rack member connected to the drive shaft, or connected and fixed to both the drive shaft and the piston in an internal space of the coupling case, and a pinion engaged with a teeth-shaped rack on an outer surface of the rack member.