A gearwheel arrangement, comprising: - a gearwheel configured to be rotatable about an axis of rotation, the gearwheel comprising a gearwheel body and an annular gear tooth section extending around the gearwheel body, the gear tooth section comprising a plurality of external gear teeth, wherein at least a part of the gear tooth section extends past a radially outer portion of the gearwheel body in an axial direction of the gearwheel, so that at least one radially inwardly facing surface (5a, 5b) is provided opposite of the external gear teeth, - means for guiding cooling fluid toward the at least one radially inwardly facing surface (5a, 5b) so as to cool the gear tooth section during rotation of the gearwheel about the axis of rotation, wherein the at least one radially inwardly facing surface (5a, 5b) comprises a first annular surface extending between a first side surface of the gear tooth section and a first side surface of the gearwheel body, and a second annular surface extending between a second side surface of the gear tooth section and a second side surface of the gearwheel body, the first and the second annular surfaces (5a, 5b) being formed on axially opposite sides of the radially outer portion of the gearwheel body, and wherein the means for guiding cooling fluid toward the at least one radially inwardly facing surface (5a, 5b) comprises a conduit formed in the gearwheel body, the conduit being configured for receiving cooling fluid provided via a shaft on which the gearwheel is mounted, the conduit being formed by a first bore extending backward and radially outward with respect to the axis of rotation, and a second bore extending in the axial direction between the first side surface and the second side surface, wherein the first bore extends into the second bore so that the cooling fluid provided via the first bore can be pumped to a first outlet provided just radially inside of the first annular surface, and a second outlet provided just radially inside of the second annular surface, via which cooling fluid may be provided to the at least one radially inwardly facing surface (5a, 5b), and characterized in that the gear tooth section comprises two annular flanges (8a, 8b), protruding radially inward from the gear tooth section, and delimiting the first and second annular surfaces (5a, 5b), respectively, in the axial direction. - a gearwheel configured to be rotatable about an axis of rotation, the gearwheel comprising a gearwheel body and an annular gear tooth section extending around the gearwheel body, the gear tooth section comprising a plurality of external gear teeth, wherein at least a part of the gear tooth section extends past a radially outer portion of the gearwheel body in an axial direction of the gearwheel, so that at least one radially inwardly facing surface (5a, 5b) is provided opposite of the external gear teeth, - means for guiding cooling fluid toward the at least one radially inwardly facing surface (5a, 5b) so as to cool the gear tooth section during rotation of the gearwheel about the axis of rotation, wherein the at least one radially inwardly facing surface (5a, 5b) comprises a first annular surface extending between a first side surface of the gear tooth section and a first side surface of the gearwheel body, and a second annular surface extending between a second side surface of the gear tooth section and a second side surface of the gearwheel body, the first and the second annular surfaces (5a, 5b) being formed on axially opposite sides of the radially outer portion of the gearwheel body, and wherein the means for guiding cooling fluid toward the at least one radially inwardly facing surface (5a, 5b) comprises a conduit formed in the gearwheel body, the conduit being configured for receiving cooling fluid provided via a shaft on which the gearwheel is mounted, the conduit being formed by a first bore extending backward and radially outward with respect to the axis of rotation, and a second bore extending in the axial direction between the first side surface and the second side surface, wherein the first bore extends into the second bore so that the cooling fluid provided via the first bore can be pumped to a first outlet provided just radially inside of the first annular surface, and a second outlet provided just radially inside of the second annular surface, via which cooling fluid may be provided to the at least one radially inwardly facing surface (5a, 5b), and characterized in that the gear tooth section comprises two annular flanges (8a, 8b), protruding radially inward from the gear tooth section, and delimiting the first and second annular surfaces (5a, 5b), respectively, in the axial direction.