JP5863944B2 - Regenerative energy type power generator and its hydraulic pump mounting method - Google Patents

Description

  The present invention relates to a renewable energy type power generation device that generates electric power from renewable energy and a method for attaching a hydraulic pump thereof. Here, the renewable energy type power generation device is a power generation device using renewable energy such as wind, tidal current, ocean current, river flow, etc., for example, wind power generation device, tidal current power generation device, ocean current power generation device, river current power generation device, etc. Can be mentioned.

  In recent years, from the viewpoint of conservation of the global environment, wind power generators using wind power and renewable energy power generators including power generators using tidal currents, ocean currents, or river currents have been widely used. In the regenerative energy type power generation device, the kinetic energy of wind, tidal current, ocean current or river current is converted into the rotational energy of the rotor, and the rotational energy of the rotor is converted into electric power by the generator.

2. Description of the Related Art A regenerative energy type power generation apparatus that employs a hydraulic transmission that combines a hydraulic pump and a hydraulic motor is known.
For example, Patent Document 1 describes a wind power generator using a hydraulic transmission in which a hydraulic pump driven by rotation of a rotor and a hydraulic motor connected to a generator are combined. Patent Document 1 discloses an example of a structure for attaching a hydraulic pump to a rotor, in which a pump shaft of a hydraulic pump is fastened to an end of the rotor (see FIG. 4C).

US Patent Application Publication No. 2010/0032959

  However, in the regenerative energy type power generation device described in Patent Document 1, the pump shaft is fastened to the rotor using a fastening member (bolt) that penetrates the pump shaft that extends straight along the axial direction of the rotor over the entire length thereof. ing. Therefore, it becomes difficult to manage the tensile force of the fastening parts when the hydraulic pump is installed. In particular, the recent renewable energy type power generators have a large diameter from the viewpoint of improving the power generation efficiency and the pump shaft tends to be long. Therefore, in the hydraulic pump mounting structure described in Patent Document 1, the tensile force of the fastening parts is reduced. Management is expected to become increasingly difficult.

  In view of the above circumstances, at least some embodiments of the present invention provide a regenerative energy type power generator and a method of attaching a hydraulic pump thereof that can easily manage the tensile force of a fastening part when the pump shaft is attached to the rotating shaft. The purpose is to provide.

  A renewable energy power generation device according to an embodiment of the present invention is a renewable energy power generation device that generates electric power from renewable energy, and includes at least one blade and the renewable energy received via the blade. A hub that rotates together with the blade, a rotary shaft connected to the hub, a pump shaft connected to an end of the rotary shaft remote from the hub, and rotation of the pump shaft attached to the pump shaft A hydraulic pump including a pressure oil generating mechanism that generates pressure oil by a hydraulic motor driven by the hydraulic oil from the hydraulic pump, and a generator driven by the hydraulic motor, and the pump shaft includes: A cylinder that holds the pressure oil generating mechanism on the outer peripheral side and has an internal space on the inner peripheral side And at least one fastening member that extends in the fastening direction from the internal space toward the rotary shaft, with the inward flange provided closer to the rotary shaft than the cylindrical portion. And the fastening member penetrates the inward flange and is partially inserted into the end of the rotating shaft.

  In this regenerative energy type power generating device, the pump shaft is provided with an inward flange positioned on the rotating shaft side with respect to the cylindrical portion that holds the pressure oil generating mechanism on the outer peripheral side. The pump shaft is coupled to the rotating shaft by at least one fastening member extending in the fastening direction from the inner space on the inner peripheral side of the cylindrical portion toward the rotating shaft. Therefore, the fastening member for fastening the pump shaft to the rotary shaft is possible if it is long enough to penetrate the inward flange of the pump shaft and reach the fastening depth in the end of the rotary shaft. It can be as short as possible. Therefore, it becomes easy to manage the tensile force of the fastening part when the pump shaft is attached to the rotating shaft.

In at least one embodiment, the regenerative energy type power generator further includes at least one bearing that pivotally supports the rotating shaft, and between the bearing closest to the pump shaft and the pump shaft among the at least one bearing. The outer diameter of the rotating shaft may be substantially constant (the rotating shaft is flangeless).
This makes it possible to employ a simple bearing assembly method in which the rear bearing is inserted from the end of the rotating shaft while suppressing an increase in the size of the rear bearing.
The at least one bearing includes a front bearing close to the hub and a rear bearing close to the pump shaft, and the bearing box of the front bearing and the bearing box of the rear bearing are connected to each other by a cylindrical connection frame, It may be held. The cylindrical connection frame maintains concentricity between the bearings in each bearing box. Therefore, even if a complicated load (including bending load) due to fluctuations in the input from the renewable energy source to the rotating shaft is applied to the rotating shaft, the load in a direction that is not expected due to the misalignment of the center of each bearing A situation in which components are added to the bearing can be prevented, and the life of the bearing can be extended.

In one embodiment, the regenerative energy type power generation device further includes a friction shim having at least one hole through which the fastening member passes and provided between the end surface of the rotating shaft and the inward flange. Also good.
Thereby, a large frictional force due to the friction shim is obtained by the fastening force of the plurality of fastening members, and a large torque from the rotating shaft can be reliably transmitted to the pump shaft. Further, slippage between the rotating shaft and the pump shaft is prevented.

The at least one fastening member includes a plurality of fastening members arranged in a staggered manner in a fastening area between the inward flange and the end surface of the rotary shaft, and the at least one hole is formed in the fastening member. Correspondingly, the annular member includes the holes arranged in a staggered manner, and the friction shim is constituted by a plurality of segments divided by a dividing line inclined with respect to a radial direction so as to avoid the plurality of holes. It may be.
By using the friction shim that is an annular member that can be divided into a plurality of segments along the dividing line in this way, the friction shim can be easily manufactured. In a typical embodiment, a friction shim for a large wind power generator (eg, 7 MW class) has a coefficient of friction of 0.5 or greater.
Further, more fastening members can be provided by arranging the fastening members for fastening the inward flanges of the pump shaft on the end surface of the rotating shaft in the fastening area. By increasing the number of fastening members, the clamping force increases, and the frictional force due to the friction shim can be increased. Further, by dividing the dividing line of the friction shim (annular member) into a plurality of segments with respect to the radial direction so as to avoid the holes arranged in a staggered manner, more fastening members can be provided in each segment. it can. Therefore, the frictional force due to the friction shim can be further increased.

The friction shim may have an outer diameter of 1 m or more and an inner diameter of 0.5 m or more.
If the outer diameter of the friction shim is 1 m or more, the number of fastening members (bolts) can be increased and the number can be increased. Therefore, for example, in a relatively large renewable energy type power generation device of 3 MW or more, a sufficient tightening force can be expressed with respect to a large torque received from a renewable energy source, and a shearing force due to friction can be increased. Similarly, if the inner diameter of the friction shim is set to 0.5 m or more, the size of the fastening member (bolt) can be increased and the number can be increased, and a sufficient tightening force can be generated for the large torque received from the regenerative energy source. In addition, the shear force due to friction can be increased. Further, by making the inner diameter relatively large such as 0.5 m or more, the thickness of the end portion of the inward flange and the rotating shaft can be reduced, so that the weight of the shaft system can be reduced.

  The friction shim may carry diamond particles on both sides. Thereby, the frictional force by the friction shim can be further increased.

In one embodiment, the pressure oil generating mechanism generates a ring cam attached to an outer periphery of the cylindrical portion, a plurality of pistons arranged radially around the ring cam and reciprocated by the ring cam, and the pressure oil. A cylinder block provided with a cylinder that forms a working chamber together with each piston, and the pressure oil generating mechanism includes a cylindrical shell covering an outer peripheral surface of the cylinder block and a pair of ends provided at both ends of the cylindrical shell. A cylindrical peripheral surface for holding a bearing, which is housed in a pump housing including an end plate, and the first end plate close to the hub of the pair of end plates is formed on the inward flange via a first pump bearing. And the second end plate far from the hub of the pair of end plates is It may be supported on an outer peripheral surface of the cylindrical portion via two pump bearings.
In one embodiment, the pump shaft includes a cylindrical portion that holds the pressure oil generating mechanism on the outer peripheral side, and an inward flange that is provided closer to the rotating shaft than the cylindrical portion, the inward flange and the end surface of the rotating shaft. As described above, the hydraulic pump is attached to the rotating shaft by at least one fastening member for fastening. In this case, if the pressure oil generating mechanism configured as described above is adopted and a working chamber composed of a piston and a cylinder is arranged around the cylinder portion of the pump shaft having a relatively large diameter, a large number of working chambers are provided. The displacement of the hydraulic pump can be finely adjusted. On the other hand, by providing an inward flange fastened to the end face of the rotating shaft as a part of the pump shaft, the rotating shaft can be made smaller in diameter than the cylindrical portion of the pump shaft. To reduce the total weight.

In one embodiment, the first end plate is located on an inner peripheral side, an inner peripheral portion to which an outer ring of the first pump bearing is fixed, and radially outward from the inner peripheral portion toward the cylindrical shell. The inner peripheral portion has an internal flow path through which the pressure oil generated in the working chamber flows, and is formed thicker in the axial direction than the outer peripheral portion. Also good.
As a result, the internal flow path is arranged on the inner peripheral portion of the first end plate having a shorter peripheral length than the outer peripheral portion of the first end plate, thereby suppressing an increase in the weight of the first end plate while suppressing the increase in weight of the first end plate. The surrounding first end plate can be thickened. Therefore, it is possible to improve the resistance of the first end plate to the pressure oil while reducing the weight of the first end plate. That is, even if the inner peripheral portion of the first end plate around the internal flow path is formed thick in the axial direction so as to withstand the high pressure oil pressure, the inner peripheral portion has a relatively short peripheral length. The weight of the entire end plate is not increased so much, and both the suppression of the weight of the first end plate and the improvement in resistance to pressure oil can be achieved.

The regenerative energy type power generator further includes a nacelle that houses at least the rotating shaft and the hydraulic pump, and the pump housing via the arm portion connected to at least the inner peripheral portion of the first end plate. May be supported on the nacelle side. The arm portion may be connected to a wide range of the first end plate including the outer peripheral portion as well as the inner peripheral portion of the first end plate.
In this way, by supporting the pump housing on the nacelle side via the arm portion, the pump housing that is going to rotate with the pump shaft can be fixed in the rotational direction. In addition, by connecting the arm part to the inner peripheral part of the first end plate that is formed thicker than the outer peripheral part, the pump housing is reliably supported on the nacelle side via the arm part. Can do.

In addition, the regenerative energy type power generator is configured to prevent the pump housing from rotating together with the pump shaft while allowing the displacement of the pump housing in a direction orthogonal to the axis of the pump shaft. You may further provide the pump support which supports the said pump housing to the said nacelle side.
In general, a rotating shaft of a renewable energy type power generation device receives a bending force due to a large load (wind load in the case of a wind power generation device) from the energy flow of the renewable energy. At this time, when the pump housing is rigidly fixed to the nacelle, the rotating shaft is immovable with respect to the nacelle, so that concentrated load caused by the bending of the rotating shaft supports the rotating shaft rotatably on the nacelle. It will be added to the bearing (main shaft bearing) and the pump bearing of the hydraulic pump.
Therefore, by configuring the pump support so as to prevent the pump housing from rotating together with the pump shaft while allowing the displacement of the pump housing in the direction orthogonal to the axis of the pump shaft, the bearing (main shaft due to the deflection of the rotating shaft) The concentrated load on the bearing and pump bearing) can be reduced.

The regenerative energy type power generator further includes a pressure oil pipe that connects an outlet portion of the hydraulic pump and an inlet portion of the hydraulic motor, and through which the pressure oil supplied from the hydraulic pump to the hydraulic motor flows. At least a part of the pressure oil pipe may be formed of a flexible pipe.
When the pump support allows displacement of the pump housing in a direction perpendicular to the axis of the pump shaft, a relative displacement occurs between the hydraulic pump attached to the rotating shaft and a hydraulic motor not directly connected to the rotating shaft. . For this reason, if all of the pressure oil pipes connecting the hydraulic pump and the hydraulic motor have a rigid pipe structure, a large load is applied to the pipes.
Therefore, as described above, at least a part of the pressure oil pipe is a flexible pipe, the relative displacement between the hydraulic pump and the hydraulic motor is absorbed by the flexible pipe, and the load applied to the pressure oil pipe can be reduced. Furthermore, since the pressure oil flowing in the pressure oil pipe is high temperature, thermal stress is generated due to the thermal expansion of the pressure oil pipe. By configuring at least a part of the pressure oil pipe with a flexible pipe, a flexible pipe is formed. The pipe can absorb the thermal elongation of the pressure oil pipe and suppress the generation of thermal stress.

  Each of the first pump bearing and the second pump bearing may be a thrust bearing.

In one embodiment, the regenerative energy type power generation device is supported by the nacelle via at least one of the rotary shaft, the hydraulic pump, and the hydraulic motor, and at least one of an elastic member and a damper mechanism, and the hydraulic motor May be further included.
In this way, by mounting the hydraulic motor on the installation base supported by the nacelle via at least one of the elastic member and the damper mechanism, the vibration at the time of driving the hydraulic motor is attenuated, and the hydraulic motor can be stabilized. Can be supported by nacelle.

In one embodiment, the inner surface of the cylindrical portion may be tapered so that the thickness of the cylindrical portion decreases as the distance from the hub increases.
The pump shaft is desired to be as light as possible while having a strength capable of withstanding a large torque input from the rotating shaft. Therefore, by forming the inner surface of the cylindrical portion into a tapered shape as described above, a region near the rotating shaft of the cylindrical portion that requires a relatively large strength is formed thick, and the strength may be relatively small. By reducing the area of the cylindrical portion far from the rotary shaft, the strength and weight reduction of the pump shaft can be achieved.

In one embodiment, the renewable energy power generator further includes a slip ring that is provided in the internal space of the cylindrical portion and electrically connects a stationary cable and a rotating cable that rotates together with the rotating shaft. You may have.
Thereby, a slip ring can be arrange | positioned using the internal space of the inner peripheral side of the cylindrical part of a pump shaft effectively. The slip ring is a mechanism that enables electrical connection between the stationary cable and the rotating cable. For example, devices provided around the hub (pitch drive device, blade abnormality monitoring device, etc.) And a device (such as a control device or a power supply device) located in the nacelle may be provided for electrical connection.

  The renewable energy type power generation device may be a wind power generation device that generates electric power from wind as the renewable energy. Alternatively, the renewable energy type power generation device may be another type of power generation device including a tidal current power generation device, an ocean current power generation device, a river current power generation device, and the like.

  According to an embodiment of the present invention, there is provided a method for attaching a hydraulic pump of a regenerative energy generator, wherein a hub and a rotating shaft connected to the hub are rotated together with the blade by renewable energy received through at least one blade. A method for mounting a hydraulic pump of a regenerative energy type power generator that generates power by inputting rotation of the rotary shaft into a generator by a hydraulic transmission including a hydraulic pump and a hydraulic motor, wherein the hydraulic pump generates pressure oil A pressure oil generating mechanism; and a pump shaft that holds the pressure oil generating mechanism and includes a cylindrical portion having an internal space on the inner peripheral side and an inward flange provided on one end side of the cylindrical portion, The pump shaft is arranged so that the inward flange faces the end surface of the end portion far from the hub. The fastening member partially on the end of the rotating shaft such that at least one fastening member extends in a fastening direction from the internal space toward the rotating shaft through the inward flange. And a step of connecting the pump shaft to the rotating shaft by insertion.

  Thus, the pump shaft is rotated by connecting the pump shaft to the rotating shaft using at least one fastening member extending in the fastening direction from the inner space on the inner peripheral side of the cylindrical portion of the pump shaft toward the rotating shaft. The fastening member for fastening to the shaft can be as short as possible if it is long enough to penetrate the inward flange of the pump shaft and reach the fastening depth in the end of the rotating shaft. Therefore, it becomes easy to manage the tensile force of the fastening part when the pump shaft is attached to the rotating shaft.

  According to at least some embodiments of the present invention, the fastening member for fastening the pump shaft to the rotating shaft penetrates the inward flange of the pump shaft and reaches the fastening depth in the end of the rotating shaft. If the length is sufficient, the length can be shortened as much as possible, and management of the tensile force of the fastening part when the pump shaft is attached to the rotating shaft becomes easy.

It is a figure which shows the outline of the whole structure of the wind power generator which concerns on one Embodiment. It is a perspective view which shows the structural example inside the nacelle of the wind power generator which concerns on one Embodiment. It is a perspective view which shows the structural example of the nacelle baseplate in one Embodiment. It is sectional drawing along the AA line in FIG. It is a figure which shows the fastening part periphery of a rotating shaft and a pump shaft in one Embodiment. It is a figure which shows the structural example of a friction shim. It is sectional drawing of the pressure oil production | generation mechanism along the radial direction of the hydraulic pump in one Embodiment. It is sectional drawing of the pressure oil production | generation mechanism along the axial direction of a hydraulic pump in one Embodiment. It is a figure which shows a mode that the 1st end plate was fixed to the nacelle side. It is a figure which shows a mode that the bearing box was connected with the cylindrical connection frame.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

  In the following embodiments, a wind power generator will be described as an example of a renewable energy power generator. However, the present invention can also be applied to other renewable energy power generation devices such as tidal current power generation devices, ocean current power generation devices, and river current power generation devices.

  FIG. 1 is a diagram showing an outline of the overall configuration of the wind turbine generator. FIG. 2 is a perspective view showing a configuration example inside the nacelle of the wind turbine generator. FIG. 3 is a perspective view showing a configuration example of the nacelle base plate.

As shown in FIG. 1, the wind turbine generator 1 includes a rotor 3 composed of blades 2 and a hub 4, a rotating shaft 6 connected to the hub 4 of the rotor 3, a generator 16 that generates electric power, and rotation. And a drive train 10 that transmits the rotational energy of the shaft 6 to the generator 16.
The hub 4 is covered with a hub cover 5. Further, at least the rotating shaft 6 may be accommodated in a nacelle 30 installed on a tower 8 standing on the ocean or on the ground.

The rotating shaft 6 is rotatably supported by the nacelle 30 via a pair of bearings (front bearing 20 and rear bearing 22) housed in bearing boxes 21 and 23, respectively. The bearing boxes 21 and 23 of the bearings 20 and 22 may be supported by the nacelle base plate 30 </ b> A of the nacelle 30 and may be coupled to each other by the coupling frame 40.
The nacelle base plate 30A and the connecting frame 40 will be described in detail later.

As shown in FIG. 1, the drive train 10 includes a hydraulic pump 12 attached to the rotary shaft 6 and a hydraulic motor 14 connected to the hydraulic pump 12 via a high pressure oil line 13 and a low pressure oil line 15. May be. The hydraulic pump 12 is driven by the rotary shaft 6 to increase the pressure of the hydraulic oil and generate high-pressure hydraulic oil (pressure oil). The outlet of the hydraulic pump 12 is connected to the inlet of the hydraulic motor 14 via the high pressure oil line 13. Therefore, the pressure oil generated by the hydraulic pump 12 is supplied to the hydraulic motor 14 via the high-pressure oil line 13, and the hydraulic motor 14 is driven by this pressure oil. The low-pressure hydraulic oil that has been worked by the hydraulic motor 14 is returned again to the hydraulic pump 12 via the low-pressure oil line 15 provided between the outlet of the hydraulic motor 14 and the inlet of the hydraulic pump 12. The output shaft of the hydraulic motor 14 is connected to the rotating shaft of the generator 16, and the rotation of the hydraulic motor 14 is input to the generator 16.
In addition, the number of the hydraulic pump 12, the hydraulic motor 14, and the generator 16 is not specifically limited, Each should just be at least one.

The drive train 10 and the generator 16 may be installed in the nacelle 30.
In the exemplary embodiment shown in FIG. 2, the nacelle 30 includes a nacelle base plate 30A that supports bearing boxes 21 and 23 in which the bearings 20 and 22 are accommodated, and various devices placed on the nacelle base plate 30A. And a nacelle frame 30C to which the nacelle cover 30B is fixed. The nacelle base plate 30A is made of a casting such as spheroidal graphite cast iron or tough cast iron.
A hydraulic pump 12 is attached to the end of the rotating shaft 6. In addition, a pair of equipment installation bases 46 are provided on both sides of the rotating shaft 6 (however, only the front equipment installation base 46 is shown in FIG. 2), and each equipment installation base 46 has a pair of hydraulic pressures. A motor 14 and one generator 16 are installed. The device installation base 46 is supported by a nacelle base plate 30A and a nacelle frame 30C assembled thereto.
In addition, the apparatus installation stand 46 may be supported by the nacelle 30 side through at least one of an elastic member and a damper mechanism. Thereby, the vibration at the time of the drive of the hydraulic motor 14 is attenuated, and the hydraulic motor 14 can be stably supported on the nacelle 30 side.

  Here, the configuration of the nacelle base plate 30A will be described in detail. For example, as shown in FIG. 3, the nacelle base plate 30 </ b> A is orthogonal to the horizontal plate portion 32 extending in the horizontal direction, the wall portion 34 provided on the horizontal plate portion 32, and the axial direction of the rotary shaft 6. You may use the nacelle baseplate 30A containing the rib 36 extended along a direction. In addition, you may provide the manhole 58 for a worker to pass in in the wall part 34 and the rib 36. FIG.

  In the example shown in FIG. 3, the horizontal plate portion 32 protrudes outward along the side wall portions of the wall portion 34 located on both sides of the rotating shaft 6, and a holding hole for holding the yaw motor 52 (see FIG. 2). 33 is provided on the horizontal plate portion 32. In addition, a pinion gear (not shown) is attached to the yaw motor 52, and a ring gear that meshes with the pinion gear is provided in the tower 8. Therefore, when the yaw motor 52 is driven to rotate the pinion gear, the nacelle base plate 30A supported by the tower 8 via the yaw turning seat bearing 50 (see FIG. 1) turns.

  A base plate opening 31 is provided in the horizontal plate portion 32 along the inner periphery of the wall portion 34, and the base plate opening 31 is closed by a nacelle deck plate 38. The nacelle deck board 38 is used as a scaffold for workers when performing maintenance on the equipment in the nacelle. A deck opening 39 is formed in the nacelle deck plate 38, and the nacelle 30 and the tower 8 are connected via the deck opening 39. Accordingly, the parts to be transported can be moved through the deck opening 39 by using a part lifting mechanism in the nacelle 30 such as a crane or a hoist. The deck opening 39 may be freely opened and closed as necessary. For example, the deck opening 39 can be opened only when a part to be transported is transported via the deck opening 39.

As shown in FIG. 3, a recess 35 is provided in a portion of the wall portion 34 of the nacelle base plate 30 </ b> A on the hub 4 side so that the lower portion of the bearing box 21 of the front bearing 20 is engaged with the recess 35. It has become. Similarly, the rib 36 is provided with a concave portion 37, and the lower portion of the bearing box 23 of the rear bearing 22 is engaged with the concave portion 37. The bearing boxes 21 and 23 engaged with the recesses 35 and 37 are fastened to the nacelle base plate 30A (the upper surface of the wall 34) on both sides of the bearing boxes 21 and 23, as shown in FIG. Therefore, the bearing box 21 is supported from below by the wall 34 and fastened to the nacelle base plate 30A, and the bearing box 23 is supported from below by the rib 36 and fastened to the nacelle base plate 30A. Therefore, the lower portions of the bearing boxes 21 and 23 are restrained by the nacelle base plate 30A.
On the other hand, the upper portions of the bearing boxes 21 and 23 are connected to each other by the connecting frame 40 and are restrained by the connecting frame 40.
Thus, since the bearing boxes 21 and 23 are restrained by the nacelle base plate 30A and the connecting frame 40, the concentricity between the bearings 20 and 22 can be maintained.

As shown in FIG. 2, the connecting frame 40 is provided above the rotating shaft 6 to connect the upper parts of the bearing boxes 21 and 23 and has a connecting plate part 42 having a mounting part 43 of a component lifting mechanism such as a crane. A pair of support portions 44 that support the connecting plate portion 42 on the nacelle base plate 30A on both sides of the rotary shaft 6 may be included. As a result, not only can the upper parts of the bearing boxes 21 and 23 be connected by the connecting plate portion 42 to contribute to maintaining the concentricity between the bearings 20 and 22, but the component lifting mechanism can be mounted on the mounting portion 43 provided on the connecting plate portion 42. Even in the case of mounting, the load of the component lifting mechanism can be supported by the support portion 44.
In addition, the attaching part 43 may be comprised so that the jib of the crane as a component raising / lowering mechanism can be fixed using arbitrary fastening members. Further, as shown in FIG. 2, the support unit 44 may function as a stair when the worker moves up and down.

  4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a view showing the periphery of the fastening portion between the rotary shaft 6 and the pump shaft 70.

As shown in FIG. 4, the front bearing 20 has a configuration in which a rolling element 20 </ b> C is held between an inner ring 20 </ b> A and an outer ring 20 </ b> B, and is housed in a bearing box 21. Similarly, the rear bearing 22 has a configuration in which a rolling element 22C is held between an inner ring 22A and an outer ring 22B, and is housed in a bearing box 23. In the figure, the front bearing 20 as a radial bearing without self-alignment is a double-row cylindrical roller bearing, and the rear bearing 22 as a thrust bearing without self-alignment is a double-row tapered roller bearing. An example is shown.
Further, as shown in the figure, the bearing housing 21 of the front bearing 20 has a brake that brakes the rotary shaft 6 by gripping a brake disk 60 fastened to the hub 4 together with the flange of the rotary shaft 6. A plurality of calipers 62 may be attached.

  Here, a structural example of the hydraulic pump 12 will be described in detail with reference to FIGS. As shown in FIGS. 4 and 5, the hydraulic pump 12 includes a pump shaft 70 connected to an end portion of the rotating shaft 6 far from the hub 4, and a pressure oil generating mechanism 80 that generates pressure oil by the rotation of the pump shaft 70. It is comprised including. The pressure oil generating mechanism 80 is housed in the pump housing 100.

  The pump shaft 70 has a cylindrical portion 72 formed larger in diameter than the rotary shaft 6 around the joint portion with the pump shaft 70, and an inward flange 74 provided on the rotary shaft 6 side of the cylindrical portion 72. .

  A pressure oil generating mechanism 80 is held on the outer peripheral side of the cylindrical portion 72. For example, the ring cam 82 of the pressure oil generating mechanism 80 may be attached on the outer peripheral surface 72A of the cylindrical portion 72 substantially parallel to the central axis of the pump shaft 70. On the other hand, on the inner peripheral side of the cylindrical portion 72, there is an internal space 73 surrounded by the inner peripheral surface 72B of the cylindrical portion 72. The internal space 73 may be provided with a slip ring 54 that electrically connects the cable 56 on the stationary side and the cable 57 on the rotation side.

  As shown in FIG. 4, the inner peripheral surface 72 </ b> B of the cylindrical portion 72 may be tapered so that the thickness of the cylindrical portion 72 decreases as the distance from the hub 4 increases. Thereby, the region (front region) near the rotating shaft 6 of the cylindrical portion 72 where relatively high strength is required is formed thick, and the side of the cylindrical portion 72 far from the rotating shaft 6 that may be relatively small in strength. This area (rear area) can be made thin so that both the strength and weight reduction of the pump shaft 70 can be achieved.

  An inward flange 74 positioned closer to the rotary shaft 6 than the cylindrical portion 72 extends radially inward from the cylindrical portion 72. In other words, the inward flange 74 is an area where the diameter of the pump shaft 70 changes from the diameter of the cylindrical portion 72 toward the diameter of the rotary shaft 6.

The inward flange 74 is fastened to the rotary shaft 6 by the fastening member 90 in a state where the surface of the inward flange 74 is directly or indirectly butted against the end surface of the rotary shaft 6. For example, a combination of a stud and a nut can be used as the fastening member 90, and the inward flange 74 is fastened to the end surface of the rotary shaft 6 in a fastening direction (see FIG. 5) from the internal space 73 toward the rotary shaft 6. ing. The fastening member 90 extends in the fastening direction from the internal space 73 toward the rotary shaft 6, penetrates the inward flange 74, and is partially inserted into the rotary shaft 6.
A plurality of fastening members 90 may be provided in an annular fastening area between the end surface of the rotating shaft 6 and the inward flange 74. For example, a plurality of fastening members 90 are arranged in a staggered manner in the fastening area. Also good. If a plurality of fastening members 90 are arranged in a staggered manner in the fastening area, more fastening members 90 can be provided.

  A positioning fitting portion 91 (see FIG. 5) is provided between the end surface of the rotating shaft 6 and the outer surface of the inward flange 74. In the fitting portion 91, a concave portion and a convex portion respectively formed on the end surface of the rotating shaft 6 and the outer surface of the inward flange 74 are fitted to each other. The fitting portion 91 determines the radial position of the pump shaft 70 with respect to the rotating shaft 6. Therefore, the work of attaching the hydraulic pump 12 to the rotating shaft 6 is facilitated.

Further, the outer diameter of the rotary shaft 6 may be substantially constant between the rear bearing 22 housed in the bearing box 23 and the pump shaft 70. That is, the rotary shaft 6 between the rear bearing 22 and the pump shaft 70 is not provided with a flange for fastening with the pump shaft 70. This makes it possible to employ a simple bearing assembly method in which the rear bearing 22 is inserted from the end of the rotating shaft 6 while suppressing an increase in the size of the rear bearing 22.
The pump shaft 70 can be fastened to the rotary shaft 6 that is not provided with a flange at the end portion by using the internal space 73 located on the inner peripheral side of the cylindrical portion 72 from the internal space 73. This is because the inward flange 74 is fastened to the end surface of the rotary shaft 6 in the fastening direction toward the rotary shaft 6.

Further, from the viewpoint of reliably transmitting a large torque from the rotating shaft 6 to the pump shaft 70, a friction shim 92 (see FIG. 5) is provided between the outer surface of the inward flange 74 and the end surface of the rotating shaft 6. Also good.
FIG. 6 is a diagram illustrating a configuration example of the friction shim 92. As shown in the figure, each of the fastening members 91 passes through the friction shim 92 corresponding to a plurality of fastening members 91 arranged in a staggered manner in the fastening area between the inward flange 74 and the end surface of the rotary shaft 6. A plurality of holes 93 may be provided in a staggered manner. In addition, the friction shim 92 can be divided into a plurality of segments 96, and the boundary line (division line to the segment 96) 94 of each segment 96 is inclined with respect to the radial direction so as to avoid each hole 93. Also good.
By using the friction shim 92 that is an annular member that can be divided into a plurality of segments 96 along the dividing line 94 as described above, the friction shim 92 can be easily manufactured. In addition, a plurality of fastening members 90 are provided in each segment 96 by inclining the dividing line 94 into the plurality of segments 96 of the friction shim 92 with respect to the radial direction so as to avoid the holes 93 arranged in a staggered manner. be able to. Therefore, the frictional force by the friction shim 92 can be further increased.

  For example, the friction shim 92 may have an outer diameter of 1 m or more and an inner diameter of 0.5 m or more. Further, diamond particles may be supported on both surfaces of the friction shim 92 from the viewpoint of further increasing the frictional force by the friction shim 92.

7 and 8 are diagrams showing a configuration example of the pressure oil generating mechanism 80. FIG. As shown in the figure, the pressure oil generating mechanism 80 is provided with a ring cam 81, a plurality of pistons 82 arranged radially around the ring cam 81, and a cylinder 84 that forms a working chamber 83 together with each piston 82. The cylinder block 85 may be included.
The ring cam 81 is an annular member having a large number of lobes on the outer peripheral surface, and is fixed on the outer peripheral surface 72 </ b> A of the cylindrical portion 72 of the pump shaft 70. In order to form a large number of working chambers 83, a plurality of rows (four rows in the example shown in FIG. 8) of ring cams 81 may be provided in the axial direction of the pump shaft 70.
The piston 82 includes a piston main body 82A located on the working chamber 83 side and a roller 82B provided on the ring cam 81 side. The roller 82B is rotatably held by the piston body 82A and transmits the pressing force from the ring cam 81 to the piston body 82A. The piston body 82A that receives the pressing force from the ring cam 81 via the roller 82B reciprocates while being guided by the cylinder 84, and periodically changes the volume of the working chamber 83. As described above, the piston main body 82A reciprocates, thereby sucking the working oil into the working chamber 83 from the low pressure oil line 15 (see FIG. 1), and compressing the working oil in the working chamber 83 to compress the high pressure oil. The compression process of sending the pressure oil to the line 13 (see FIG. 1) is repeated.
Each working chamber 83 is connected to the high-pressure oil line 13 via a high-pressure communication path 86 (see FIG. 7) provided inside the cylinder block 85 and has an annular shape provided on the outer periphery of the cylinder block 85. It is connected to the low pressure oil line 15 via the low pressure communication path 87. Further, a high pressure valve 88 is provided between each working chamber 83 and the corresponding high pressure communication passage 86, and a low pressure valve 89 is provided between each working chamber 83 and the corresponding low pressure communication passage 87. Is provided. By opening and closing the high-pressure valve 88 and the low-pressure valve 89, the communication state between each working chamber 83 and the high-pressure oil line 13 or the low-pressure oil line 15 can be switched.

The displacement volume of the hydraulic pump 12 can be adjusted by opening / closing control of the high pressure valve 88 and the low pressure valve 89. For example, the number of working chambers 83 (active chambers in which pressurization is performed) that repeats the suction process and the compression process by opening and closing the high-pressure valve 88 and the low-pressure valve 89 according to the phase of the ring cam 81 and the phase of the ring cam 81. Even if the displacement ratio of the hydraulic pump 12 is adjusted by changing the ratio with the number of working chambers 83 (non-active chambers where no pressurization is performed) that keeps the high pressure valve 88 closed and the low pressure valve open. Good.
The displacement volume of the hydraulic pump 12 refers to the volume of pressure oil that is sent to the high-pressure oil line 13 while the pump shaft 70 rotates once.

In the pressure oil generating mechanism 80 having the above-described configuration, the displacement volume is adjusted by changing the state of each working chamber 83 by the opening / closing control of the high pressure valve 88 and the low pressure valve 89, so that the displacement volume of the hydraulic pump is finely controlled. To achieve this, it is advantageous that the number of working chambers 83 is large.
Here, as one design for providing a large number of working chambers 83, it is conceivable that the diameter of the cylinder 84 that forms each working chamber 83 is reduced and a larger number of working chambers 83 are arranged in the circumferential direction. However, in this design, the ratio of the axial length to the diameter of the cylinder 84 may deviate from an appropriate range and may not be adopted.
Therefore, in some embodiments, a working chamber 83 including a piston 82 and a cylinder 84 is disposed around a cylindrical portion 72 having a relatively large diameter in the pump shaft 70. Thereby, many working chambers 83 can be provided while maintaining the ratio of the axial length to the diameter of the cylinder 84 within an appropriate range. The multiple working chambers 83 allow the pressure oil generating mechanism 80 to finely adjust the displacement volume of the hydraulic pump 12. On the other hand, since the end surface of the rotating shaft 6 is fastened to an inward flange 74 extending radially inward from the cylindrical portion 72, the rotating shaft 6 can be formed to have a smaller diameter than the pump shaft 72. 6 and the bearings 20 and 22 supporting the shaft 6 can be made compact to reduce the weight.
In this way, it is possible to achieve both fine control of the displacement volume of the hydraulic pump 12 and weight reduction of the rotary shaft 6 and the bearings 20 and 22.

The pressure oil generating mechanism 80 may be housed in the pump housing 100. As shown in FIG. 8, the pump housing 100 includes a cylindrical shell 102 that covers the outer peripheral surface of the cylinder block 85, and a pair of annular end plates 104 and 105 that are provided at both ends of the cylindrical shell 102.
The first end plate 104 close to the hub 4 is supported on a cylindrical peripheral surface 74 </ b> A formed on the inward flange 74 via the first pump bearing 106. On the other hand, the second end plate 105 far from the hub 4 is supported on the outer peripheral surface 72 </ b> A of the cylindrical portion 72 via the second pump bearing 108. Each of the first pump bearing 106 and the second pump bearing 108 may be a thrust bearing.
The first end plate 104 and the second end plate 105 are fastened to each other by a tie bolt 101 that passes through the cylinder block 85.

The first end plate 104 is positioned on the inner peripheral side, and extends radially outward from the inner peripheral portion 110 toward the cylindrical shell 102, to which the outer ring of the first pump bearing 106 is fixed. And an outer peripheral portion 112. In the first end plate 104, the inner peripheral portion 110 is formed thicker than the outer peripheral portion 112. In addition, an internal flow path 114 in which the pressure oil generated in the working chamber 83 flows toward the high-pressure oil line 13 is provided in the inner peripheral portion 110 of the first end plate 104. The internal flow path 114 communicates with the working chamber 83 via the high pressure communication path 86.
As described above, by arranging the internal flow path 114 in the inner peripheral portion 110 having a shorter peripheral length than the outer peripheral portion 112, an increase in the weight of the first end plate 104 is suppressed, and the first end plate 104 against the pressure oil is suppressed. Resistance can be improved. That is, even if the inner peripheral portion 110 of the first end plate 104 around the internal flow path 114 is formed thick so as to withstand the high pressure oil pressure, the inner peripheral portion 110 has a relatively short peripheral length. The weight of the entire end plate 104 is not increased so much, and the weight of the first end plate 104 can be suppressed and the resistance against pressure oil can be improved.

The first end plate 104 may be fixed to the nacelle 30 side from the viewpoint of preventing co-rotation with the rotary shaft 6 of the pump housing 100.
FIG. 9 is a diagram illustrating a state in which the first end plate 104 is fixed to the nacelle 30 side. As shown in the figure, the arm portion 120 is connected to the first end plate 104 in a wide range from the inner peripheral portion 110 to the outer peripheral portion 112. A pair of arm portions 120 are provided on both sides of the rotating shaft 6, and the first end plate 104 is fixed to the nacelle 30 side via each arm portion 120. FIG. 9 shows an example in which the arm portion 120 is connected to a wide radial range from the inner peripheral portion 110 to the outer peripheral portion 112 of the first end plate 104, but the arm portion 120 is connected to the first end plate 104. It may be connected only to the inner peripheral part 110 of.
Thus, the nacelle 30 of the pump housing 100 via the arm part 120 is connected by connecting the arm part 120 to the inner peripheral part 110 of the first end plate 104 formed to be thicker than the outer peripheral part 112 in this way. Support to the side can be performed reliably.

A pump support 122 may be provided between the arm part 120 and the nacelle 30, and the pump housing 122 may support the pump housing 100 on the nacelle 30 side via the arm part 120.
In the example shown in FIG. 9, the pump support 122 is disposed between the nacelle base plate 30 </ b> A and the arm unit 120. The pump support 122 is configured to immobilize the pump housing 100 in the rotational direction while allowing displacement of the pump housing 100 in a direction orthogonal to the axis of the pump shaft 70. In some embodiments, the pump support 122 allows any degree of freedom of displacement other than rotation of the pump housing 100 relative to the nacelle base plate 30A. Thereby, the concentrated load to the bearings 20 and 22 and the pump bearings 106 and 108 resulting from the bending of the rotating shaft 6 can be reduced.

Further, as shown in FIG. 9, at least a part of the high-pressure oil line (pressure oil piping) 13 from the outlet portion 130 of the hydraulic pump 12 to the inlet portion 132 of the hydraulic motor 14 may be configured by a flexible pipe 134. .
Thus, by constituting at least a part of the high-pressure oil line 13 with the flexible pipe 134, the relative displacement between the hydraulic pump 12 and the hydraulic motor 14 is absorbed by the flexible pipe 134 and applied to the high-pressure oil line 13. Can be reduced. Furthermore, since the pressure oil flowing in the high-pressure oil line 13 is at a high temperature, thermal stress is generated due to the thermal elongation of the high-pressure oil line 13, but at least a part of the high-pressure oil line 13 is configured by the flexible pipe 134. Thus, the flexible pipe 134 can absorb the thermal elongation of the high-pressure oil line 13 and suppress the generation of thermal stress.

Next, a procedure for attaching the hydraulic pump 12 to the rotating shaft 6 in the wind power generator 1 having the above configuration will be described.
First, the pair of bearings 20 and 22 are assembled to the rotating shaft 6 in the order of the front bearing 20 and the rear bearing 22. Specifically, the front bearing 20 and the bearing box 21 are attached to the rotary shaft 6 by fitting the front bearing 20 from the end of the rotary shaft 6 far from the hub 4. Thereafter, the rear bearing 22 is fitted from the end of the rotating shaft 6 far from the hub 4, and the rear bearing 22 and its bearing box 23 are attached to the rotating shaft 6.
Then, the pump shaft 70 is disposed on the rotary shaft 6 so that the inward flange 74 of the pump shaft 70 faces the end surface of the rotary shaft 6 far from the hub 4. At this time, in the fitting portion 91, the concave portion and the convex portion respectively formed on the end surface of the rotating shaft 6 and the outer surface of the inward flange 74 are fitted to each other, so that the radial direction of the pump shaft 70 with respect to the rotating shaft 6 Positioning may be performed. Thereafter, the inward flange 74 of the pump shaft 70 is fastened to the end surface of the rotary shaft 6 using the fastening member 90. Finally, the pressure oil generating mechanism 80 and the pump housing 100 are assembled to the pump shaft 70. Alternatively, the pressure oil generating mechanism 80 and the pump housing 100 may be assembled in advance to the pump shaft 70 before connecting the pump shaft 70 to the rotary shaft 6.

  As described above, in some embodiments, the pump shaft 70 is provided with the inward flange 74 positioned on the rotating shaft 6 side relative to the cylindrical portion 72 that holds the pressure oil generating mechanism 80 on the outer peripheral side. Yes. The pump shaft 70 is connected to the rotating shaft 6 by a fastening member 90 extending in a fastening direction from the inner space 73 on the inner peripheral side of the cylindrical portion 72 toward the rotating shaft 6. Therefore, the fastening member 90 for fastening the pump shaft 70 to the rotating shaft 6 passes through the inward flange 74 of the pump shaft 70 and is long enough to reach the fastening depth in the end portion of the rotating shaft 6. If so, it can be as short as possible. Therefore, it becomes easy to manage the tensile force of the fastening component 90 when the pump shaft 70 is attached to the rotary shaft 6.

  As mentioned above, although embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to this, In the range which does not deviate from the summary of this invention, various improvement and deformation | transformation may be performed.

For example, in the above-described embodiment, the example in which the upper part of the bearing box 21 of the front bearing 20 and the upper part of the bearing box 23 of the rear bearing 22 are connected by the connecting frame 40 having the connecting plate part 42 has been described. 21 and 23 may be connected by a cylindrical connecting frame.
FIG. 10 is a diagram illustrating a state in which the bearing boxes 21 and 23 are connected by a cylindrical connection frame. As shown in the figure, a cylindrical connecting frame 140 is provided between the bearing boxes 21 and 23 so as to surround the rotary shaft 6, and each bearing box 21 and 23 is fixed to an end of the connecting frame 140. Yes. As a result, the bearing boxes 21 and 23 of the bearings 20 and 22 can be constrained by the cylindrical connection frame 140 and the concentricity between the bearings 20 and 22 can be maintained. Therefore, even when a complicated load (including a bending load) due to input fluctuation from the blade 2 to the rotating shaft 6 is applied to the rotating shaft 6, the centers of the bearings 20 and 22 are not expected to be displaced. A situation in which a load component in the direction is applied to the bearings 20 and 22 can be prevented, and an expected life of the bearings 20 and 22 can be realized.
Further, when the bearing boxes 21 and 23 have sufficient rigidity to maintain the concentricity of the bearings 20 and 22, the connection frames 40 and 140 are omitted, and the bearing boxes 21 and 23 are formed only by the nacelle base plate 30A. You may be restrained.

DESCRIPTION OF SYMBOLS 1 Wind power generator 2 Blade 3 Rotor 4 Hub 5 Hub cover 6 Rotating shaft 8 Tower 10 Drive train 12 Hydraulic pump 13 High pressure oil line 14 Hydraulic motor 15 Low pressure oil line 16 Generator 20 Front bearing 20A Inner ring 20B Outer ring 20C Rolling element 21 Bearing box 22 rear bearing 22A inner ring 22B outer ring 22C rolling element 23 bearing box 30 nacelle 30A nacelle base plate 30B nacelle cover 30C nacelle frame 31 base plate opening 32 horizontal flat plate portion 33 holding hole 34 wall portion 35 concave portion 36 rib 37 concave portion 38 nacelle deck plate 39 deck Opening 40 Connection frame 42 Connection plate portion 44 Support portion 46 Equipment installation table 50 Yaw slewing bearing 52 Yaw motor 54 Slip ring 56 Stationary cable 57 Rotation cable 58 Manhole 60 Brake 62 Brake caliper 70 Pump shaft 72 Cylindrical portion 73 Internal space 74 Inward flange 80 Pressure oil generating mechanism 81 Ring cam 82 Piston 82A Piston body 82B Roller 83 Working chamber 84 Cylinder 85 Cylinder block 86 High pressure communication passage 87 Low pressure communication passage 88 High pressure valve 89 Low-pressure valve 90 Fastening member 91 Fitting portion 92 Friction shim 93 Hole 94 Dividing line 96 Segment 100 Pump housing 102 Cylindrical shell 104 First end plate 105 Second end plate 106 First pump bearing 108 Second pump bearing 110 Inner peripheral portion 112 Outer peripheral part 114 Internal flow path 120 Arm part 122 Pump support 130 Outlet part 132 Inlet part 134 Flexible piping

Claims (18)

A renewable energy power generation device that generates electric power from renewable energy,
A blade,
A hub that rotates with the blades by the renewable energy received via the blades;
A rotating shaft coupled to the hub;
A hydraulic pump including a pump shaft connected to an end of the rotary shaft remote from the hub, and a pressure oil generating mechanism attached to the pump shaft to generate pressure oil by rotation of the pump shaft;
A hydraulic motor driven by the pressure oil from the hydraulic pump;
A generator driven by the hydraulic motor,
The pump shaft includes a cylindrical portion that holds the pressure oil generating mechanism on the outer peripheral side and has an internal space on the inner peripheral side, and an inward flange provided on the rotating shaft side than the cylindrical portion,
The rotary shaft and the pump shaft are connected by at least one fastening member extending in a fastening direction from the internal space toward the rotary shaft, and the fastening member passes through the inward flange and passes through the inward flange. Partially inserted into the end,
The hydraulic pump further includes a pump housing having a cylindrical shell and a pair of end plates provided at both ends of the cylindrical shell,
The pressure oil generating mechanism is housed in the pump housing,
A first end plate close to the hub of the pair of end plates is supported by a cylindrical peripheral surface for bearing holding formed on the inward flange via a first pump bearing, and the first end plate of the pair of end plates A regenerative energy type power generating device, wherein the second end plate far from the hub is supported on the outer peripheral surface of the cylindrical portion via a second pump bearing. And further comprising at least one bearing for pivotally supporting the rotating shaft,
2. The regenerative energy generator according to claim 1, wherein an outer diameter of the rotary shaft is substantially constant between the pump shaft and a bearing closest to the pump shaft among the at least one bearing. . 2. The regenerative energy according to claim 1, further comprising: a friction shim that has at least one hole through which the fastening member passes and is provided between an end surface of the rotating shaft and the inward flange. Type generator. A renewable energy power generation device that generates electric power from renewable energy,
A blade,
A hub that rotates with the blades by the renewable energy received via the blades;
A rotating shaft coupled to the hub;
A hydraulic pump including a pump shaft connected to an end of the rotary shaft remote from the hub, and a pressure oil generating mechanism attached to the pump shaft to generate pressure oil by rotation of the pump shaft;
A hydraulic motor driven by the pressure oil from the hydraulic pump;
A generator driven by the hydraulic motor,
The pump shaft includes a cylindrical portion that holds the pressure oil generating mechanism on the outer peripheral side and has an internal space on the inner peripheral side, and an inward flange provided on the rotating shaft side than the cylindrical portion,
The rotary shaft and the pump shaft are connected by at least one fastening member extending in a fastening direction from the internal space toward the rotary shaft, and the fastening member passes through the inward flange and passes through the inward flange. Partially inserted into the end,
A friction shim provided between the end face of the rotating shaft and the inward flange; and at least one hole through which the fastening member passes.
The at least one fastening member includes a plurality of fastening members arranged in a staggered manner in a fastening area between the inward flange and the end surface of the rotary shaft,
At least one of the holes includes the holes arranged in a staggered manner corresponding to the fastening members, and the friction shim is divided by a dividing line inclined with respect to a radial direction so as to avoid the plurality of holes. A regenerative energy type power generator characterized by being an annular member constituted by a plurality of segments.   The regenerative energy generator according to claim 3, wherein the friction shim has an outer diameter of 1 m or more and an inner diameter of 0.5 m or more.   The regenerative energy generator according to claim 3, wherein the friction shim carries diamond particles on both sides. The pressure oil generating mechanism includes a ring cam attached to the outer periphery of the cylindrical portion, a plurality of pistons radially disposed around the ring cam and reciprocated by the ring cam, and an operating chamber for generating the pressure oil. And a cylinder block provided with a cylinder that forms the piston together with each piston,
The regenerative energy generator according to claim 1, wherein an outer peripheral surface of the cylinder block is covered with the cylindrical shell of the pump housing. The first end plate is located on an inner peripheral side and an outer peripheral portion to which an outer ring of the first pump bearing is fixed, and an outer periphery extending radially outward from the inner peripheral portion toward the cylindrical shell. Including
The regeneration energy according to claim 7 , wherein the inner peripheral portion has an internal flow path through which the pressure oil generated in the working chamber flows, and is formed thicker than the outer peripheral portion. Type generator. A nacelle that houses at least the rotating shaft and the hydraulic pump;
The regenerative energy type power generator according to claim 8, wherein the pump housing is supported on the nacelle side through at least an arm portion connected to the inner peripheral portion of the first end plate.   The pump housing is supported on the nacelle side via the arm so as to prevent the pump housing from rotating together with the pump shaft while allowing displacement of the pump housing in a direction perpendicular to the axis of the pump shaft. The regenerative energy type power generator according to claim 9, further comprising a pump support. A pressure oil pipe that connects an outlet portion of the hydraulic pump and an inlet portion of the hydraulic motor, and through which the pressure oil supplied from the hydraulic pump to the hydraulic motor flows;
The regenerative energy power generator according to claim 10, wherein the pressure oil pipe is at least partially formed of a flexible pipe.   The regenerative energy type power generator according to claim 7, wherein each of the first pump bearing and the second pump bearing is a thrust bearing. A nacelle that houses at least the rotating shaft, the hydraulic pump, and the hydraulic motor;
The regenerative energy type power generator according to claim 1, further comprising an installation base supported by the nacelle via at least one of an elastic member and a damper mechanism and on which the hydraulic motor is placed. A renewable energy power generation device that generates electric power from renewable energy,
A blade,
A hub that rotates with the blades by the renewable energy received via the blades;
A rotating shaft coupled to the hub;
A hydraulic pump including a pump shaft connected to an end of the rotary shaft remote from the hub, and a pressure oil generating mechanism attached to the pump shaft to generate pressure oil by rotation of the pump shaft;
A hydraulic motor driven by the pressure oil from the hydraulic pump;
A generator driven by the hydraulic motor,
The pump shaft includes a cylindrical portion that holds the pressure oil generating mechanism on the outer peripheral side and has an internal space on the inner peripheral side, and an inward flange provided on the rotating shaft side than the cylindrical portion,
The rotary shaft and the pump shaft are connected by at least one fastening member extending in a fastening direction from the internal space toward the rotary shaft, and the fastening member passes through the inward flange and passes through the inward flange. Partially inserted into the end,
The pressure oil generating mechanism includes a ring cam attached to the outer periphery of the cylindrical portion, a plurality of pistons radially disposed around the ring cam and reciprocated by the ring cam, and an operating chamber for generating the pressure oil. And a cylinder block provided with a cylinder that forms the piston together with each piston,
The outer peripheral surface of the cylindrical portion is parallel to the axial direction of the pump shaft at least in the axial position range where the ring cam is provided,
The inner peripheral surface of the cylindrical portion is inclined with respect to the axial direction at least in the axial position range, and is tapered so that the thickness of the cylindrical portion becomes thinner as the distance from the hub increases. Renewable energy type generator.   2. The slip ring according to claim 1, further comprising a slip ring that is provided in the internal space of the cylindrical portion and electrically connects a stationary cable and a rotating cable that rotates together with the rotating shaft. Renewable energy generator. The at least one bearing comprises a front bearing close to the hub and a rear bearing close to the pump shaft;
The regenerative energy generator according to claim 2, wherein a bearing box of the front bearing and a bearing box of the rear bearing are connected to each other by a cylindrical connection frame.   The renewable energy type power generator according to claim 1, wherein the renewable energy type power generator is a wind power generator that generates electric power from wind as the renewable energy. A method for attaching a hydraulic pump of a regenerative energy power generator according to any one of claims 1 to 17,
Disposing the pump shaft such that the inward flange faces the end surface of the end of the rotating shaft far from the hub;
By partially inserting the fastening member into the end of the rotating shaft such that at least one fastening member extends through the inward flange in a fastening direction from the internal space toward the rotating shaft. And a step of connecting the pump shaft to the rotating shaft.

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