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A hydraulic pump unit includes a cylindrical member that is fit into an outer circumference of the main shaft and a hydraulic pump body arranged on an outer circumferential side of the cylindrical member. The hydraulic pump body includes a ring cam mounted on the outer circumference of the cylindric

A hydraulic pump unit includes a cylindrical member that is fit into an outer circumference of the main shaft and a hydraulic pump body arranged on an outer circumferential side of the cylindrical member. The hydraulic pump body includes a ring cam mounted on the outer circumference of the cylindrical member, a pump bearing, a pump housing, a plurality of pistons housed in the pump housing and actuated by the ring cam, and a plurality of cylinders which guide the plurality of pistons in a radial direction and are arranged in a circumferential direction. The hydraulic pump unit is configured such that the pump unit is insertably fixed to the main shaft by the cylindrical member.

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1. A hydraulic pump structure for a wind turbine generator or a tidal current generator which comprises a hub equipped with a plurality of blades, a main shaft connected to the hub and a hydraulic pump mounted on the main shaft, the hydraulic pump structure comprising: a hydraulic pump unit includin

1. A hydraulic pump structure for a wind turbine generator or a tidal current generator which comprises a hub equipped with a plurality of blades, a main shaft connected to the hub and a hydraulic pump mounted on the main shaft, the hydraulic pump structure comprising: a hydraulic pump unit including a cylindrical member, which is fit onto an outer circumference of the main shaft, anda hydraulic pump body, which is arranged on an outer circumferential side of the cylindrical member to be attached to the main shaft via the cylindrical member, the hydraulic pump body being unitized with the cylindrical member to form the hydraulic pump unit,wherein the hydraulic pump body comprises: a ring cam is mounted on the outer circumference of the cylindrical member;a pump bearing mounted on the outer circumference of the cylindrical member;a pump housing supported by the cylindrical member rotatably with respect to the cylindrical member via the pump bearing;a plurality of pistons, which is housed in the pump housing and is configured to be actuated by the ring cam that is rotatable with the main shaft; anda plurality of cylinders, which guides the plurality of pistons in a radial direction and is arranged in a circumferential direction,wherein the hydraulic pump unit is configured such that the cylindrical member unitized with the hydraulic pump body is insertably fixed to the main shaft,whereinthe cylindrical member has a large diameter section and small diameter sections disposed on both ends of the large diameter section,the ring cam is arranged on an outer circumferential side of the large diameter section, andthe pump bearing is mounted on stepped portions between the large diameter section and the small diameter sections. 2. The hydraulic pump structure according to claim 1, wherein the main shaft has a stepped portion with a reduced diameter, and a tip section of the cylindrical member of the hydraulic pump unit comes in contact with the stepped portion of the main shaft so as to position the hydraulic pump unit. 3. The hydraulic pump structure according to claim 1, wherein the cylindrical member is fixed to the main shaft by any one of a shrink disk connection, a flange coupling, a key connection and an involute spline connection. 4. The hydraulic pump structure according to claim 1, wherein the pump housing is formed into an almost cylindrical shape having end walls, and the end walls of the pump housing have an inner circumferential opening which is supported by the pump bearing. 5. The hydraulic pump structure according to claim 1, wherein the main shaft has a hollow structure. 6. A method of mounting the hydraulic pump of the wind turbine generator or the tidal current generator having the hydraulic pump structure according to claim 1, the method comprising: assembling the hydraulic pump unit in advance; theninserting and fixing to the main shaft a first main shaft bearing which secures the main shaft rotatably on a body side of the wind turbine generator or the tidal current generator; thenfitting the hydraulic pump unit having been assembled beforehand onto the main shaft via the cylindrical member of the hydraulic pump unit; and thenfixing the hydraulic pump unit to the main shaft by a fixing member. 7. The method according to claim 6, further comprising: inserting and fixing a second main shaft bearing to the main shaft, wherein the first main shaft bearing is inserted and fixed to the main shaft, the hydraulic pump unit is then inserted and fixed to the main shaft, and the second main shaft bearing is then inserted and fixed to the main shaft. 8. The method according to claim 6, wherein the hydraulic pump unit and the first main shaft bearing are inserted and fixed to the main shaft from a side opposite to the hub. 9. The method according to claim 6, further comprising: fixing the main shaft to a nacelle on the body side of the wind turbine generator or the tidal current generator in a state where the first main shaft bearing and the hydraulic pump unit are fixed to the main shaft, after said inserting and fixing the first main shaft bearing and the hydraulic pump unit to the main shaft. 10. The method according to claim 9, wherein in said fixing the main shaft to the nacelle on the body side of the wind turbine generator or the tidal current generator, the pump housing of the hydraulic pump unit is fixed to the nacelle on the body side of the wind turbine generator or the tidal current generator via a damper mechanism which has a damping effect against vibration. 11. The method according to claim 10, wherein the damper mechanism prevents deformation of the pump housing and an assembling difference while maintaining an axial center of the pump housing of the hydraulic pump unit with respect to the nacelle, and the damper mechanism is mounted on a flange portion protruding in a radial direction from both sides of a torque arm arranged on an outer circumference of the pump housing. 12. A method of mounting the hydraulic pump of the wind turbine generator or the tidal current generator having the hydraulic pump structure to claim 1, the method comprising: assembling the hydraulic pump unit in advance; then inserting and fixing to the main shaft a third main shaft bearing which secures the main shaft rotatably on a body side of the wind turbine generator or the tidal current generator; theninserting and fixing a fourth main shaft bearing to the main shaft adjacent to the third main shaft bearing or with a distance from the third main shaft bearing; thenfitting the hydraulic pump unit having been assembled beforehand on the main shaft via the cylindrical member of the hydraulic pump unit; and thenfixing the hydraulic pump unit to the main shaft by a fixing member. 13. The method according to claim 12, wherein the hydraulic pump unit and the third and fourth main shaft bearings are inserted and fixed to the main shaft from a side opposite to the hub. 14. The method according to claim 13, further comprising fixing the main shaft to a nacelle on the body side of the wind turbine generator or the tidal current generator in a state where the third and fourth main shaft bearings and the hydraulic pump unit are fixed to the main shaft, after said inserting and fixing the third and fourth main shaft bearings and the hydraulic pump unit to the main shaft. 15. The method according to claim 14, wherein in said fixing the main shaft to the nacelle on the body side of the wind turbine generator or the tidal current generator, the pump housing of the hydraulic pump unit is fixed to the nacelle on the body side of the wind turbine generator or the tidal current generator via a damper mechanism. 16. The method according to claim 15, wherein the damper mechanism, which has a damping effect against vibration and prevents deformation of the pump housing and an assembling difference while maintaining an axial center of the pump housing of the hydraulic pump unit with respect to the nacelle, and is mounted on a flange portion protruding in a radial direction from both sides of a torque arm arranged on an outer circumference of the pump housing. 17. A hydraulic pump structure for a wind turbine generator or a tidal current generator which comprises a hub equipped with a plurality of blades, a main shaft connected to the hub and a hydraulic pump mounted on the main shaft, the hydraulic pump structure comprising: a hydraulic pump unit including a cylindrical member attached to the main shaft, anda hydraulic pump body attached to the main shaft via the cylindrical member,wherein the hydraulic pump body comprises: a ring cam mounted on the cylindrical member;a pair of pump bearings mounted on the cylindrical member;a pump housing supported by the cylindrical member rotatably with respect to the cylindrical member via the pair of pump bearings;a plurality of pistons, which is housed in the pump housing and is configured to be actuated by the ring cam that is rotatable with the main shaft; anda plurality of cylinders, which guides the plurality of pistons in a radial direction and is arranged in a circumferential direction, andwhereinthe cylindrical member has a first section and a pair of second sections disposed on both ends of the first section,each of the second sections has a different diameter from the first section,the ring cam is arranged on the first section, andeach of the pump bearings is mounted on a stepped portion between the first section and one of the second sections. 18. The hydraulic pump structure according to claim 17, wherein the hydraulic pump body is arranged on an outer circumference of the main shaft via the cylindrical member, andwherein the cylindrical member includes a large diameter section defining the first section, the ring cam arranged on an outer circumference of the first section, anda pair of small diameter sections defining the pair of the second sections, each of the small diameter sections having a diameter smaller than the large diameter section.