Combined Power System

Abstract

To facilitate maintenance work for a rotating parameter detector provided on a rotating shaft of a rotating electric machine system that constitutes a compound power system.SOLUTION: A rotating electric machine system 10 forming a compound power system 300 includes a rotating shaft 40. The rotating shaft 40 includes a hollow cylindrical outer shaft 36 and an inner shaft 34 that is removably inserted into the hollow interior of the outer shaft 36. Further, the first end and the second end of the rotating shaft 40 are rotatably supported by a rotating electric machine housing 14 via a first bearing 92 and a second bearing 94.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a composite power system in which a rotating electrical machine system and an internal combustion engine are integrally configured. [Background technology]

[0002] Patent Document 1 discloses a composite power system that integrates a rotating electric machine with a gas turbine engine, which is a type of internal combustion engine. In this case, the rotating shaft of a rotor that constitutes the rotating electric machine and the output shaft of the gas turbine engine are connected on the same axis line, and the two shafts rotate integrally. Here, as shown in Fig. 1 of Patent Document 1, the rotating shaft is rotatably supported via a journal (bearing) with respect to a housing for the rotating electric machine that houses a stator.

[0003] Incidentally, a rotating electric machine is provided with a rotation parameter detector for detecting rotation parameters such as the rotation speed, rotation angle, and number of rotations of the rotating shaft. If the rotation parameter detector becomes excessively hot, the detection accuracy decreases. Therefore, Patent Document 2 proposes a configuration for cooling the rotation parameter detector (rotation sensor). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-106029 A [Patent Document 2] JP 2016-59133 A Summary of the Invention [Problem to be solved by the invention]

[0005] For example, when the rotation parameter detector is a resolver, a resolver rotor is fitted onto the rotating shaft. In this configuration, if the portion of the rotating shaft where the resolver rotor is fitted is located deep inside the housing for the rotating electric machine, when performing maintenance on the resolver, it is necessary to remove the bearing from the housing for the rotating electric machine and then take out the rotating shaft from the housing for the rotating electric machine. That is, in this case, a complicated dismantling operation is required. Furthermore, the dismantling operation takes a long time.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to provide a composite power system including a rotating electric machine system capable of accurately detecting the rotation parameters of a rotating shaft. [Means for solving the problem]

[0007] In order to achieve the above object, according to one embodiment of the present invention, there is provided a rotating electric machine system including a rotating electric machine and a rotating electric machine housing that rotatably supports a rotating shaft of the rotating electric machine; an internal combustion engine having an output shaft that rotates integrally with the rotary shaft; A hybrid power system comprising: the rotating shaft has a first end and a second end, and a first bearing and a second bearing are provided between the housing for the rotating electric machine and the first end and between the housing for the rotating electric machine and the second end, respectively, so that the rotating shaft is rotatably supported by the housing for the rotating electric machine via the first bearing and the second bearing; The rotating shaft includes a hollow cylindrical outer shaft and an inner shaft removably inserted into the hollow interior of the outer shaft. Effect of the Invention

[0008] According to the present invention, the rotating shaft constituting the rotating electric machine is composed of an outer shaft and an inner shaft. In this configuration, for example, a rotation parameter detector can be attached to the inner shaft protruding from the outer shaft. In this case, since the rotation parameter detector is provided at a position exposed from the outer shaft, work such as removing a bearing is not required when performing maintenance on the rotation parameter detector. Furthermore, if necessary, it is sufficient to simply detach the inner shaft from the outer shaft. This makes maintenance easier to perform. Also, the work time is shortened. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic overall perspective view of a combined power system according to an embodiment of the present invention; [Diagram 2] 1 is a schematic overall perspective view of a rotating electric machine system that constitutes a compound power system; [Diagram 3] 1 is a schematic cross-sectional side view of a rotating electric machine system; [Figure 4] FIG. 4 is an enlarged view of a main part of FIG. [Diagram 5] 5 is an enlarged view of a main part of FIG. 3 at a different location from FIG. 4. [Figure 6] 4 is a schematic perspective view of a second sub-housing that constitutes the housing for the rotating electric machine and an inner housing that constitutes the housing for the engine. FIG. [Figure 7] FIG. 2 is a schematic diagram illustrating a configuration of a current converter provided in a housing for a rotating electric machine. [Figure 8] 1 is a schematic cross-sectional side view of a gas turbine engine that constitutes a combined power system; [Figure 9] FIG. 9 is an enlarged view of a main part of FIG. 8. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A preferred embodiment of the compound power system according to the present invention will be described in detail below with reference to the accompanying drawings. Note that "left", "right", "down" and "up" in the following particularly refer to the left, right, down and up in Figures 3 to 5, 8 and 9, but this is for convenience in simplifying the description and making it easier to understand, and does not specify the posture when the compound power system is actually used.

[0011] 1 is a schematic overall perspective view of a combined power system 300 according to this embodiment. The combined power system 300 includes a rotating electric machine system 10 and a gas turbine engine 200, which is an internal combustion engine. The gas turbine engine 200 is disposed axially right of the rotating electric machine system 10. An axis passing through the diameter center of the rotating electric machine system 10 and extending along the longitudinal direction (axial direction) coincides with an axis passing through the diameter center of the gas turbine engine 200 and extending along the longitudinal direction (axial direction).

[0012] In other words, the rotating electric machine system 10 and the gas turbine engine 200 are arranged in parallel on the same axis. The combined power system 300 having such a configuration can be used as a power source for propulsion in an air vehicle such as a drone, a ship, an automobile, or the like, or as a power source for auxiliary power sources in an aircraft, a ship, a building, or the like. When the combined power system 300 is mounted on an air vehicle such as a multicopter, it functions as a power drive source for rotating a motor constituting a lift generating device such as a prop or a ducted fan. When mounted on a ship, it functions as a rotational force generating device for a screw, and when mounted on an automobile, it functions as a power drive source for rotating a motor constituting an engine. In addition, the combined power system 300 can also be applied to a gas turbine power generation facility. In this embodiment, the gas turbine engine 200 also serves as a gas supply source for supplying compressed air (gas) to be described later.

[0013] First, the rotating electric machine system 10 will be described. Figures 2 and 3 are a schematic overall perspective view and a schematic side cross-sectional view, respectively, of the rotating electric machine system 10. The rotating electric machine system 10 includes a rotating electric machine 12 (e.g., a generator) and a rotating electric machine housing 14 that houses the rotating electric machine 12. The rotating electric machine housing 14 has a substantially cylindrical shape and includes a main housing 16 that has open ends on both the left and right sides, a first sub-housing 18 connected to the left end of the main housing 16, and a second sub-housing 20 connected to the right end.

[0014] The main housing 16 has a generally cylindrical shape with thick side walls extending in the left-right direction. A cooling jacket 21 through which a cooling medium flows is formed inside the side walls. A specific example of the cooling medium is cooling water, in which case the cooling jacket 21 is a water jacket. A terminal casing 22 and a measuring device casing 24 are provided integrally with the main housing 16 on the outer surface (outer wall) of the side walls of the main housing 16 near the left end.

[0015] Furthermore, hollow tubes 158a-158c are provided on the outer sidewall of the main housing 16, extending along the longitudinal direction of the main housing 16 (left and right direction in FIG. 3). The hollow interiors of the hollow tubes 158a-158c are compressed air passages through which curtain air flows. A detector holding member that holds a rotation parameter detector is connected to the first sub-housing 18. In this embodiment, a resolver 140 is exemplified as the rotation parameter detector. Therefore, hereinafter, the detector holding member connected to the first sub-housing 18 is referred to as the "resolver holder 26". A cap cover 28 is screwed to the resolver holder 26. The above will be described in detail later.

[0016] The rotating electric machine 12 includes a rotor 30 and a stator 32 that surrounds the outer periphery of the rotor 30 .

[0017] The rotor 30 includes a rotating shaft 40 configured by inserting an inner shaft 34 removably into a hollow cylindrical outer shaft 36. Specifically, the outer shaft 36 is a hollow body having a substantially cylindrical shape, and both ends thereof are open ends. That is, the outer shaft 36 has a left open end 42a (see FIG. 4) and a right open end 42b (see FIG. 5).

[0018] On the other hand, the inner shaft 34 is longer than the outer shaft 36 and has a cylindrical portion 44 with a smallest diameter, a left end 46a (see FIG. 4) continuing to the left of the cylindrical portion 44 and having a larger diameter than the cylindrical portion 44, and a right end 46b (see FIG. 5) continuing to the right of the cylindrical portion 44 and having a larger diameter than the cylindrical portion 44 and a smaller diameter than the left end 46a. A part of the left end 46a protrudes and is exposed from the left opening end 42a of the outer shaft 36, and becomes a protruding tip 104 described later. In the illustrated example, the right end 46b and the right opening end 42b of the outer shaft 36 are flush with each other, but the right end 46b may be positioned slightly recessed from the right opening end 42b.

[0019] As shown in detail in FIG. 4, the left end 46a of the inner shaft 34 is provided with a first external thread portion 48, a flange portion 50, a stopper portion 52, and a second external thread portion 54 in this order from left to right. The outer diameters of the first external thread portion 48, the flange portion 50, the stopper portion 52, and the second external thread portion 54 increase in this order. The outer diameter of the second external thread portion 54 is set to be larger than the inner diameter of the outer shaft 36, so that the right end of the second external thread portion 54 is blocked by the edge of the left open end 42a of the outer shaft 36. This prevents the inner shaft 34 from being inserted into the outer shaft 36 on the left side of the second external thread portion 54.

[0020] A resolver rotor 56 is attached to the flange 50, and a small cap nut 58 is screwed onto the first external thread 48. The resolver rotor 56 is positioned and fixed to the flange 50 by having its right end blocked by the stopper 52 and its left end pressed by the small cap nut 58. A large cap nut 60 is screwed onto the second external thread 54. A skirt 61 of the large cap nut 60 covers the outer peripheral wall of the left opening end 42a of the outer shaft 36. This causes the left end 46a of the inner shaft 34 to be constrained to the left opening end 42a of the outer shaft 36. Both the first external thread 48 and the second external thread 54 are so-called reverse threads. Therefore, the small cap nut 58 and the large cap nut 60 are rotated counterclockwise when screwed together. Furthermore, by deforming a portion of the threads of the small cap nut 58 and the large cap nut 60, the small cap nut 58 and the large cap nut 60 are prevented from becoming looser than when they were screwed together.

[0021] 5, a shaft connecting hole 62 is formed in the right end 46b of the inner shaft 34 so as to extend toward the left end 46a. A female thread 64 is formed in the inner circumferential wall of the shaft connecting hole 62. Also, a first inner circumferential spline 66 (inner circumferential engagement portion) extending in the left-right direction is formed in the outer circumferential wall of the right open end 42b of the outer shaft 36.

[0022] The second sub-housing 20, which is generally disk-shaped, is connected to the main housing 16 via bolts (not shown). The center of the second sub-housing 20 is a thick cylindrical portion, and a large-diameter insertion hole 68 is formed in the cylindrical portion. A second bearing 94 (described later) is inserted into this insertion hole 68. The second bearing 94 is sandwiched between an inner stopper 70 and an outer stopper 71 and is positioned and fixed.

[0023] 2, an annular recess 72 is formed in the end surface of the second sub-housing 20 facing the gas turbine engine 200, and an annular collecting passage 74 is formed in the annular recess 72. As will be described later, a portion of the compressed air generated by the gas turbine engine 200 is branched off and circulates in the collecting passage 74. Upstream communication holes 76 are formed in three locations in the bottom wall of the annular recess 72.

[0024] Further, inside the second sub-housing 20, a relay communication passage 78 shown in FIG. 6 is provided. The relay communication passage 78 extends radially along the diameter direction of the second sub-housing 20, and communicates with the collecting passage 74 via the upstream communication hole 76 on the outer side in the diameter direction. Furthermore, three downstream communication holes 80a to 80c are formed in the end face of the second sub-housing 20 facing the rotating electric machine 12. The downstream communication holes 80a to 80c are downstream openings of the relay communication passage 78. The three downstream communication holes 80a to 80c open individually to each of the hollow pipe portions 158a to 158c. As can be seen from this, the relay communication passage 78 communicates the collecting passage 74 with the hollow interiors (compressed air flow passages) of the hollow pipe portions 158a to 158c. The collecting passage 74 and the relay communication passage 78 form a distribution passage.

[0025] 5, a flow straightening member 82 is connected to an end face (one end in the axial direction) of the second sub-housing 20 facing the gas turbine engine 200 so as to protrude toward the gas turbine engine 200. The flow straightening member 82 is formed in a mountain shape or a bottomless cup shape with a large-diameter, thin-walled annular bottom facing the second sub-housing 20 and a small-diameter, thick-walled annular top facing the gas turbine engine 200. A side peripheral wall 83 between the bottom and the top is formed as a smooth surface with low surface roughness.

[0026] In addition, the diameter (opening diameter) of the through hole 84 on the top side is set to be larger than the outer diameter of the outer stopper 71. Therefore, the right end of the outer stopper 71 that has entered the through hole 84 does not interfere with the inner wall of the through hole 84. In other words, a gap is formed between the outer peripheral wall of the outer stopper 71 and the inner wall of the through hole 84.

[0027] The left end of the output shaft 250 is inserted into the shaft connecting hole 62 formed in the inner shaft 34. The output shaft 250 is coupled to the inner shaft 34 by screwing, as described below. The output shaft 250 supports a compressor wheel 230 and a turbine wheel 232 which constitute the gas turbine engine 200 (see FIG. 8).

[0028] 3, the outer diameter is set to the maximum at approximately the longitudinal middle portion of the outer shaft 36, and a plurality of permanent magnets 88 are held in this large diameter portion by magnet holders 90. Adjacent permanent magnets 88 are disposed adjacent to each other, and the polarities of adjacent permanent magnets 88 face the outer periphery in a direction opposite to each other. Each permanent magnet 88 revolves around the center of rotation of the rotating shaft 40 as the rotating shaft 40 rotates.

[0029] The left end (first end) of the rotating shaft 40 is rotatably supported by the first sub-housing 18 via a first bearing 92. Moreover, the right end (second end) of the rotating shaft 40 is rotatably supported by the second sub-housing 20 via a second bearing 94. Here, as shown in FIG. 3 , in this embodiment, the first bearing 92 is interposed between the outer shaft 36 and the first sub-housing 18. Moreover, the second bearing 94 is interposed between the outer shaft 36 and the second sub-housing 20 via the inner stopper 70.

[0030] That is, the first sub-housing 18 has a cylindrical protrusion 96 that protrudes toward the main housing 16 and has a generally cylindrical shape, and a first shaft insertion hole 98 is formed in the cylindrical protrusion 96. The first bearing 92 is provided in this first shaft insertion hole 98.

[0031] The left opening of the first shaft insertion hole 98 is closed by a disk member 102 in which a second shaft insertion hole 100 communicating with the first shaft insertion hole 98 is formed. Although not shown in detail, the outer peripheral wall of the left opening end 42a of the outer shaft 36 is slightly spaced apart from the inner peripheral walls of the first shaft insertion hole 98 and the second shaft insertion hole 100. In addition, the skirt portion 61 of the large cap nut 60 is slightly spaced apart from the left end face of the disk member 102.

[0032] The left end tip of the rotating shaft 40 is inserted through the inner hole of the first bearing 92, passes through the first shaft insertion hole 98 and the second shaft insertion hole 100, and is exposed so as to protrude to the outside of the first sub-housing 18. Hereinafter, the part of the rotating shaft 40 protruding from the left end of the first bearing 92 is referred to as the protruding tip, and its reference number is 104. The protruding tip 104 includes the first external thread portion 48, the flange portion 50, the stopper portion 52, and the second external thread portion 54 in the left end portion 46a of the inner shaft 34 (see FIG. 4). On the other hand, the right end of the rotating shaft 40 is inserted through the inner hole of the second bearing 94, and protrudes together with the outer stopper 71 from the insertion hole 68 formed in the second sub-housing 20 (see FIG. 5).

[0033] 3, the first shaft insertion hole 98 and a communication hole 106 formed in the inner stopper 70 communicate with a storage chamber 114 (described later), which is the internal space of the main housing 16. Therefore, the first bearing 92 and the second bearing 94 are exposed to the storage chamber 114. It goes without saying that the second shaft insertion hole 100 communicates with the storage chamber 114 via the first shaft insertion hole 98.

[0034] In this embodiment, the first bearing 92 and the second bearing 94 are of a so-called jet oil supply type, which is lubricated and cooled by lubricating oil supplied in the form of a jet flow. However, this is not particularly limited, and the bearings may be of a spray lubrication type in which an oil mist is sprayed, or of a circulating oil supply type. Bearings using such a lubrication method are well known, and therefore detailed illustrations and descriptions will be omitted.

[0035] The stator 32, which constitutes the rotating electric machine 12 together with the rotor 30, has an electromagnetic coil 116 and a plurality of insulating base materials 118 around which the electromagnetic coil 116 is wound. The electromagnetic coils 116 include three types of coils: a U-phase coil, a V-phase coil, and a W-phase coil. In other words, when the rotating electric machine 12 is a generator, the rotating electric machine 12 is a so-called three-phase power source. The insulating base materials 118 are arranged in a circular ring shape, thereby forming an inner hole in the stator 32.

[0036] The stator 32 is accommodated in a storage chamber 114 formed in the main housing 16. Here, the second sub-housing 20 serves as a stator holder. That is, an insulating base material 118 constituting the stator 32 is engaged with an annular recess 122 formed in the second sub-housing 20. This engagement positions and fixes the stator 32. Furthermore, the columnar protrusion 96 enters the inner hole of the stator 32 from its left opening.

[0037] Although detailed illustration is omitted, there is a slight gap between the inner wall of the storage chamber 114 and the electromagnetic coil 116. Due to this gap, the main housing 16 and the electromagnetic coil 116 are electrically insulated from each other.

[0038] In addition, clearances are formed between the outer peripheral wall of the cylindrical protrusion 96 and the insulating base material 118, and between the outer wall of the permanent magnet 88 and the inner wall of the electromagnetic coil 116 by slightly separating them. As described later, these clearances become part of the flow path through which the curtain air, which is a gas, flows.

[0039] 4, the first sub-housing 18 has an annular protrusion 124 that protrudes in an annular shape. The inside of the annular protrusion 124 forms a hollow recess 126. The protruding tip 104 that constitutes the left end 46a of the inner shaft 34 enters into the hollow recess 126.

[0040] The resolver holder 26, which holds a resolver stator 130, is provided on the annular protrusion 124. The resolver holder 26 has a flange-shaped stopper 132 that protrudes radially outward. The flange-shaped stopper 132 is set to a diameter larger than the inner diameter of the annular protrusion 124, and therefore the resolver holder 26 is positioned by the flange-shaped stopper 132 abutting against the annular protrusion 124. In this state, the resolver holder 26 is connected to the first sub-housing 18 via, for example, a mounting bolt (not shown) or the like.

[0041] The resolver holder 26 is provided with a small cylindrical portion 134 facing leftward and a large cylindrical portion 136 facing rightward, the small cylindrical portion 134 being larger in diameter than the small cylindrical portion 134, with a flange-shaped stopper 132 as a boundary. A retaining hole 138 is formed in the resolver holder 26, and the resolver stator 130 is held by fitting its right end into the retaining hole 138. When the large cylindrical portion 136 enters the hollow recess 126 and the flange-shaped stopper 132 abuts against the annular protrusion 124, the resolver rotor 56 held by the flange portion 50 of the left end portion 46a of the inner shaft 34 is positioned in the inner hole of the resolver stator 130. The resolver stator 130 and the resolver rotor 56 constitute a resolver 140 as a rotation parameter detector. In this embodiment, a case where a rotation angle is detected by the resolver 140 is illustrated.

[0042] A receiver connector 144 is fitted into a fitting hole 142 formed in the flange-shaped stopper 132. The resolver stator 130 and the receiver connector 144 are electrically connected via a signal line 146. A receiver-side connector of a receiver (not shown) that receives a signal emitted by the resolver 140 is inserted into the receiver connector 144. The resolver 140 and the receiver are electrically connected via the receiver connector 144 and the receiver-side connector.

[0043] The small cylindrical portion 134 is provided with a plurality of tab portions 148 (omitted from FIG. 1). One of these tab portions is shown in FIG. 3. Furthermore, the small cylindrical portion 134 is covered with a cap cover 28 that closes the left opening of the small cylindrical portion 134 and shields the left end portion 46a of the inner shaft 34. The cap cover 28 is connected to the tab portions 148 via connecting bolts 150.

[0044] As described above, the terminal casing 22 and the measuring device casing 24 are integrally provided on the side wall near the left end of the main housing 16. Among these, the measuring device casing 24 houses the thermistor 152, which is a temperature measuring device. Although not specifically shown, the measurement terminal of the thermistor 152 is drawn out from the measuring device casing 24 and connected to the electromagnetic coil 116. From the measuring device casing 24, the harness 154 connected to the thermistor 152 is drawn out to the outside.

[0045] The terminal casing 22 adjacent to the measuring device casing 24 houses a U-phase terminal 156a, a V-phase terminal 156b, and a W-phase terminal 156c electrically connected to the respective ends of the U-phase coil, the V-phase coil, and the W-phase coil. In other words, the terminal casing 22 is an external device connector to which a battery 170 (see FIG. 7) serving as an external power source electrically connected to the rotating electric machine 12 is electrically connected, and the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are electric terminals that supply power to the battery 170. The internal space of the measuring device casing 24 and the internal space of the terminal casing 22 communicate with each other via an inter-casing communication hole (not shown).

[0046] As shown in FIG. 2, hollow tubes 158a-158c provided on the outer surface of the side wall of main housing 16 are located outside cooling jacket 21 formed inside the side wall of main housing 16. That is, hollow tubes 158a-158c are adjacent to cooling jacket 21, for example. Here, in this embodiment, an example in which three hollow tubes 158a-158c are provided is illustrated, but the number of hollow tubes is appropriately set depending on the required flow rate and flow speed of curtain air. That is, the number of hollow tubes is not particularly limited to three. Similarly, the cross-sectional area of ​​the hollow tubes may be appropriately set depending on the required flow rate and flow speed of curtain air.

[0047] Here, the right ends of the hollow tubes 158a-158c overlap with three downstream communication holes 80a-80c (see FIG. 6) formed in the second sub-housing 20. That is, the collecting passage 74 communicates with the hollow interiors of the hollow tubes 158a-158c via the upstream communication hole 76, the relay communication passage 78, and the downstream communication holes 80a-80c. Meanwhile, the left end of the hollow tube 158a communicates with the hollow interior of the meter casing 24, and the left ends of the hollow tubes 158b, 158c communicate with the hollow interior of the terminal casing 22.

[0048] The curtain air flows through the collecting passage 74 on the upstream side and through the measuring device casing 24 and the terminal casing 22 on the downstream side. In this manner, the hollow tubes 158a to 158c are part of the compressed air flow passage through which the curtain air flows. The curtain air is part of the compressed air supplied from the gas turbine engine 200.

[0049] 3, the internal space of the terminal casing 22 communicates with the storage chamber 114. Therefore, the curtain air that has flowed into the internal space of the terminal casing 22 can flow into the storage chamber 114 and come into contact with the first bearing 92 and the second bearing 94.

[0050] 1 and 2, a current converter 172 is provided on the outer circumferential wall of the main housing 16, closer to the gas turbine engine 200 than the terminal casing 22. As shown in Fig. 7, the current converter 172 has a conversion circuit 174, a capacitor 176, and a control circuit 178. The conversion circuit 174, the capacitor 176, and the control circuit 178 are housed in an equipment case 180. The equipment case 180 is disposed, for example, at a location on the outer circumferential wall of the main housing 16 that does not interfere with the hollow tube portions 158a to 158c (see Fig. 1).

[0051] The conversion circuit 174 includes a power module 182 and has a function of converting the AC current generated in the electromagnetic coil 116 into a DC current. The capacitor 176 temporarily stores the DC current converted by the conversion circuit 174 as an electric charge. The conversion circuit 174 also has a function of converting the DC current sent from the battery 170 into an AC current. In this case, the capacitor 176 temporarily stores the DC current sent from the battery 170 to the electromagnetic coil 116 as an electric charge. The control circuit 178 controls the current density of the DC current flowing from the capacitor 176 to the battery 170 or the DC current flowing from the battery 170 to the capacitor 176. The DC current from the battery 170 is supplied to a motor (neither of which are shown) via an AC-DC converter, for example.

[0052] 7, in this case, the device case 180 is positioned and fixed so as to abut against the outer peripheral wall of the main housing 16. Inside the device case 180, the conversion circuit 174 and the capacitor 176 are disposed in close proximity to the main housing 16. As described above, the main housing 16 is provided with the cooling jacket 21, and therefore the conversion circuit 174 and the capacitor 176 are sufficiently close to the cooling jacket 21.

[0053] Next, a description will be given of the gas turbine engine 200. As shown in Fig. 8, the gas turbine engine 200 includes an engine housing 206 including an inner housing 202 connected to the second sub-housing 20 of the rotating electrical machine system 10, and an outer housing 204 connected to the inner housing 202.

[0054] 1 and 6, the inner housing 202 has a first annular portion 208 connected to the second sub-housing 20, a second annular portion 210 having a maximum diameter, and a plurality of (e.g., six) leg portions 212 connecting the first annular portion 208 and the second annular portion 210. A cylindrical cover portion 214 protrudes from a central opening of the second annular portion 210 toward the rotating electric machine system 10. The number of the leg portions 212 is appropriately set according to the connection strength required between the gas turbine engine 200 and the rotating electric machine system 10. That is, the number of the leg portions 212 is not particularly limited to six as shown in the illustrated example.

[0055] The right end of the leg 212 is connected to both the second annular portion 210 and the cylindrical cover portion 214. This provides the leg 212 with support rigidity. An inlet opening of the bleed passage 216 is formed at the connection point of the leg 212 with the cylindrical cover portion 214. As shown in FIG. 8, bleed passages 216 communicating with a bleed port 220 formed in the shroud case 218 are formed individually inside the leg 212 and inside the first annular portion 208. An outlet opening of the bleed passage 216 is formed individually on the end face of the first annular portion 208 facing the second sub-housing 20. The outlet opening overlaps with the collecting passage 74. That is, all of the multiple bleed passages 216 communicate with the collecting passage 74. In this way, the compressed air from the multiple bleed passages 216 flows in and is collected in the collecting passage 74.

[0056] 8, the gas turbine engine 200 further includes an inner housing 202, a shroud case 218 housed inside the outer housing 204, a compressor wheel 230, a turbine wheel 232, a diffuser 234, a combustor 236, and a nozzle 238. In this embodiment, the compressor wheel 230 and the turbine wheel 232 are separate members.

[0057] The shroud case 218 is a hollow body having a shape similar to that of the flow straightening member 82, and is larger than the flow straightening member 82. The small-diameter left end faces the flow straightening member 82, and the large-diameter right end is inserted into the inner housing 202. The left end of the shroud case 218 is exposed to the air intake space 240 formed between the legs 212 of the inner housing 202. The top portion, which is the right end of the flow straightening member 82, enters the inside of this left end. The diameter of the shroud case 218 gradually decreases from the right end to the left end, but the tip of the left end is curved so as to expand outward in the radial direction.

[0058] The compressor wheel 230 is housed within the shroud case 218. In other words, the shroud case 218 surrounds the compressor wheel 230. However, the compressor wheel 230 and the shroud case 218 are spaced apart from each other.

[0059] The compressor wheel 230 and the turbine wheel 232 can rotate integrally with the rotating shaft 40. That is, as shown in detail in FIG. 5, the compressor wheel 230 has a small diameter cylindrical portion 242 (hollow cylindrical portion) at the left end. The small diameter cylindrical portion 242 enters a through hole 84 formed at the top of the flow straightening member 82. A first outer circumferential side spline 85 (outer circumferential side engagement portion) is formed on the inner wall of the small diameter cylindrical portion 242, which extends radially inward and is made up of a plurality of teeth arranged in an annular shape. The first outer circumferential side spline 85 meshes with a first inner circumferential side spline 66 formed on the outer circumferential wall of the right opening end 42b of the outer shaft 36. The outer shaft 36 is press-fitted into the hollow interior of the small diameter cylindrical portion 242. Therefore, the inner circumferential wall of the small diameter cylindrical portion 242, particularly the left opening, presses the outer circumferential wall of the right opening end 42b of the outer shaft 36 inward. The compressor wheel 230 is connected to the outer shaft 36, and ultimately to the rotating shaft 40, by the above-mentioned meshing and press fitting.

[0060] A shaft hole 244 extending in the left-right direction is formed in the diametric center of the compressor wheel 230. A second outer periphery side spline 246 (outer periphery side teeth portion) consisting of a plurality of teeth extending diametrically inward and arranged in an annular shape is engraved on the inner wall of the shaft hole 244 near the left end. The hole diameter of the shaft hole 244 at a portion that communicates with the hollow interior of the small diameter cylindrical portion 242 is set to be slightly smaller than other portions. For this reason, an inner flange portion 248 is provided in the compressor wheel 230 near the opening of the shaft hole 244 on the small diameter cylindrical portion 242 side. The hole diameter (diameter) of the shaft hole 244 is minimum at the portion where the inner flange portion 248 is provided.

[0061] An output shaft 250 provided on the turbine wheel 232 is inserted into this shaft hole 244. The left end tip of the output shaft 250 extends to approximately the same position as the left end tip of the small diameter cylindrical portion 242 of the compressor wheel 230. As described above, the outer peripheral wall of the right open end 42b of the outer shaft 36 is inserted into the hollow interior of the small diameter cylindrical portion 242. Therefore, the left end of the output shaft 250 protruding from the shaft hole 244 enters the shaft connecting hole 62 of the rotating shaft 40. A male screw portion 252 is engraved on the left end of the output shaft 250, and the male screw portion 252 is screwed into a female screw portion 64 formed on the inner wall of the shaft connecting hole 62. This screwing connects the rotating shaft 40 and the output shaft 250.

[0062] A second inner peripheral spline 254, which is an inner peripheral tooth portion, is formed near the left end of the output shaft 250. This second inner peripheral spline 254 meshes with a second outer peripheral spline 246 formed on the inner peripheral wall of the shaft hole 244 of the compressor wheel 230. In addition, the left end portion of the output shaft 250 is passed through the inner flange portion 248 by press fitting.

[0063] As shown in FIG. 8, a ring member 256 made of a heat-resistant metal material such as a nickel-based alloy is interposed between the compressor wheel 230 and the turbine wheel 232. As shown in FIG. 9, a fitting hole 258 is formed in the ring member 256 from the compressor wheel 230 toward the turbine wheel 232. In addition, a plurality of (for example, three) labyrinth projections 264 are formed on the outer circumferential wall of the ring member 256. The labyrinth projections 264 protrude outward in the diameter direction of the ring member 256 and go around in the circumferential direction of the outer circumferential wall. As will be described later, the labyrinth projections 264 can prevent the burnt fuel (exhaust gas) generated in the combustor 236 from flowing back to the compressor wheel 230.

[0064] An annular protrusion 268 protrudes from the right end surface of the compressor wheel 230 facing the turbine wheel 232. When the left end surface of the ring member 256 is seated on the right end surface of the compressor wheel 230, the annular protrusion 268 is fitted into the fitting hole 258. On the other hand, the output shaft 250 extends from the left end surface of the turbine wheel 232 facing the compressor wheel 230. A fitting protrusion 270 is formed to protrude from the left end surface and surround the output shaft 250. When the right end surface of the ring member 256 is seated on the left end surface of the turbine wheel 232, the top surface of the fitting protrusion 270 is fitted into the fitting hole 258. As described above, parts of the compressor wheel 230 and the turbine wheel 232 are fitted into the fitting hole 258. In this state, the ring member 256 is clamped between the wheels 230, 232.

[0065] On the other hand, the labyrinth protrusion 264 is surrounded by an intermediate plate 266 in the hollow interior of the outer housing 204 (see FIG. 8), and is inserted into a hole 272 formed in the intermediate plate 266. A labyrinth flow path is formed by the inner wall of the hole 272 and the labyrinth protrusion 264 abutting thereon. The compressed air generated by the compressor wheel 230 reaches the labyrinth protrusion 264 via the back surface of the compressor wheel 230. On the other hand, the combustion gas reaches the labyrinth protrusion 264 from the turbine wheel 232 side. Since the pressure of the compressed air is set higher than the pressure of the combustion gas, it is possible to prevent the combustion gas from passing through the labyrinth protrusion 264 and flowing into the compressor wheel 230 side.

[0066] 8, in the hollow interior of the outer housing 204, the shroud case 218, the portions of the compressor wheel 230 where the diameter is greatest, and the intermediate plate 266 are surrounded by a diffuser 234. Furthermore, the turbine wheel 232 is surrounded by a nozzle 238, which is surrounded by a combustor 236. An annular combustion air flow passage 273 through which combustion air flows is formed between the combustor 236 and the outer housing 204. Meanwhile, a fuel supply nozzle 274 for supplying fuel to the combustor 236 is positioned and fixed to the right end face of the outer housing 204.

[0067] Here, the combustor 236 is formed with a relay hole 276 for communicating the combustion air flow passage 273 with the inside of the combustor 236. The combustor 236 is also formed with fine holes (not shown) for forming an air curtain for cooling the inside of the combustor 236. As described later, the combustion air compressed by the compressor wheel 230 reaches the inside of the combustor 236 via the diffuser 234, the combustion air flow passage 273, and the relay hole 276. Furthermore, the nozzle 238 is formed with a delivery hole (not shown) at a portion surrounding the largest diameter portion of the turbine wheel 232 for supplying the fuel burned together with the combustion air (hereinafter also referred to as "burned fuel". "Burned fuel" is synonymous with "combustion gas" or "exhaust gas after combustion") to the turbine wheel 232.

[0068] Further, an exhaust port 280, to which an exhaust pipe (not shown) for discharging the burned fuel is provided, opens at the right end of the outer housing 204 and the nozzle 238. The burned fuel passes through the delivery hole and advances into the nozzle 238, and is then blown out of the outer housing 204 through the exhaust port 280 under the action of the rotating turbine wheel 232.

[0069] The compound power system 300 according to this embodiment is basically constructed as described above. Next, its functions and effects will be described.

[0070] In this embodiment, the rotating electric machine system 10 and a gas turbine engine 200 constitute a compound power system 300. For this purpose, as shown in Fig. 5, an output shaft 250 is connected to the rotating shaft 40. Here, a shaft connecting hole 62 is formed in the right end portion 46b of the inner shaft 34 constituting the rotating shaft 40, and a female thread portion 64 is engraved on the inner peripheral wall of the shaft connecting hole 62. Also, a male thread portion 252 is engraved on the left end of the output shaft 250, and the left end is inserted into the shaft connecting hole 62, and the male thread portion 252 is screwed into the female thread portion 64.

[0071] In this way, since one end of the output shaft 250 is inserted into the shaft connecting hole 62 formed in one end of the rotating shaft 40, the length of the rotating shaft 40 and the output shaft 250 after they are connected to each other becomes smaller than the sum of the lengths of both shafts 40, 250. Also, since the output shaft 250 is inserted into the shaft connecting hole 62 of the rotating shaft 40, the diameter of the output shaft 250 is set smaller than the diameter of the shaft connecting hole 62. Therefore, the output shaft 250 becomes small and lightweight. For the above reasons, the combined power system 300 can be made smaller and lighter.

[0072] Then, the connection terminals of the battery 170 (see FIG. 7), which is an external power source, are connected to the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c in the terminal casing 22. In this state, a direct current is supplied from the battery 170. The conversion circuit 174 of the current converter 172 shown in FIG. 2 and FIG. 7 converts this direct current into an alternating current, and supplies it to the electromagnetic coils 116 (U-phase coil, V-phase coil, and W-phase coil) via the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c. When this alternating current flows through the electromagnetic coils 116, an alternating magnetic field is generated in the stator 32. Therefore, an attractive force and a repulsive force act alternately between the electromagnetic coils 116 and the permanent magnets 88 of the rotor 30. As a result, the rotating shaft 40 starts to rotate. It is needless to say that the rotating shaft 40 may be rotated by a known starter (not shown).

[0073] As shown in FIG. 5, a first inner circumferential spline 66 is formed on the outer circumferential wall of the right open end 42b of the outer shaft 36 constituting the rotating shaft 40, and a first outer circumferential spline 85 is formed on the inner wall of the small diameter cylindrical portion 242 of the compressor wheel 230. The first inner circumferential spline 66 and the first outer circumferential spline 85 mesh with each other. Furthermore, a second inner circumferential spline 254 is formed on the output shaft 250, and a second outer circumferential spline 246 is formed on the inner wall of the shaft hole 244 of the compressor wheel 230. The second inner circumferential spline 254 and the second outer circumferential spline 246 also mesh with each other. Therefore, the rotational torque of the rotating shaft 40 is quickly transmitted to the output shaft 250 via the compressor wheel 230.

[0074] That is, when the rotating shaft 40 starts to rotate, the output shaft 250 also starts to rotate integrally therewith. Accordingly, the compressor wheel 230 and the turbine wheel 232 supported by the output shaft 250 rotate integrally with the output shaft 250. As described above, the first inner circumference side spline 66 which is an inner circumference side engaging portion, the first outer circumference side spline 85 which is an outer circumference side engaging portion, the second inner circumference side spline 254 which is an inner circumference side tooth portion, and the second outer circumference side spline 246 which is an outer circumference side tooth portion are provided, and the first inner circumference side spline 66 and the first outer circumference side spline 85, and the second inner circumference side spline 254 and the second outer circumference side spline 246 are respectively meshed (engaged), whereby the rotation torque of the rotating shaft 40 can be sufficiently transmitted to the output shaft 250.

[0075] Moreover, the right end of the rotating shaft 40 is press-fitted into the hollow interior of the small diameter cylindrical portion 242 of the compressor wheel 230, and the left end of the output shaft 250 is press-fitted through the inner flange portion 248 of the compressor wheel 230. Therefore, the axis of the rotating shaft 40 and the axis of the output shaft 250 precisely coincide with each other. This sufficiently prevents the output shaft 250 from rotating eccentrically or vibrating.

[0076] 9, a ring member 256 is interposed between the compressor wheel 230 and the turbine wheel 232. An annular protrusion 268 on the right end surface of the compressor wheel 230 and a fitting protrusion 270 on the left end surface of the turbine wheel 232 are fitted into fitting holes 258 of the ring member 256. This fitting also contributes to suppressing eccentric rotation (vibration) of the output shaft 250. Therefore, it is not necessary to provide a mechanism for suppressing vibration or to make the output shaft 250 larger in diameter. This makes it possible to reduce the size of the compound power system 300.

[0077] Furthermore, frictional forces are generated between the right end face of the compressor wheel 230 and the left end face of the ring member 256, and between the right end face of the ring member 256 and the left end face of the turbine wheel 232. These frictional forces bring the compressor wheel 230, the ring member 256, and the turbine wheel 232 into close contact with one another. This prevents the wheels 230, 232 from rotating out of alignment.

[0078] Furthermore, when assembling the compound power system 300, the above-mentioned fitting allows the compressor wheel 230 and the turbine wheel 232 to be aligned (centered) with respect to the output shaft 250. As can be seen from this, by providing the ring member 256 between both wheels 230, 232 and fitting parts of both wheels 230, 232 individually into fitting holes 258 of the ring member 256, it becomes easy to center the compressor wheel 230 and the turbine wheel 232 with respect to the output shaft 250.

[0079] Then, by the above rotation, as shown in FIG. 8, the air is sucked into the shroud case 218 from the intake space 240 between the legs 212 of the inner housing 202. Here, the rectifying member 82 is located at the diametric center of the inner housing 202. As described above, the rectifying member 82 has a mountain shape that reduces in diameter toward the shroud case 218, and the side peripheral wall 83 is smooth. Therefore, the suctioned air is rectified by the rectifying member 82 so as to be directed toward the shroud case 218. Since the right end of the rectifying member 82 enters from the left end opening of the shroud case 218, the air efficiently enters the shroud case 218. In this way, by forming the rectifying member 82 into the above shape and by having the tip enter the shroud case 218, the air can be efficiently collected by the shroud case 218.

[0080] The air sucked into the shroud case 218 flows between the compressor wheel 230 and the shroud case 218. Since the space between the compressor wheel 230 and the shroud case 218 is sufficiently narrow compared to the left opening of the shroud case 218, the air is compressed during this flow. In other words, compressed air is generated.

[0081] An air bleed port 220 is formed near the right end (bottom) of the shroud case 218. On the other hand, the base end of the leg portion 212 of the inner housing 202 is located on the outer circumferential side of the approximately middle portion in the left-right direction of the shroud case 218. An inlet opening of an air bleed passage 216 is formed at this base end. Therefore, a part of the compressed air is diverted from the air bleed port 220 as curtain air and proceeds to the second sub-housing 20 through the air bleed passage 216 formed in the leg portion 212. As shown in FIG. 6, the curtain air flows from the outlet opening of the air bleed passage 216 into the collecting passage 74, where it is collected and diffused in an annular shape. The curtain air further flows from the collecting passage 74 through the upstream side communication hole 76, is distributed and flows into the relay communication passage 78, and then flows through the hollow interiors of the hollow pipes 158a to 158c shown in FIG. 1 and the like through each of the three downstream side communication holes 80a to 80c.

[0082] The hollow pipes 158a to 158c are located on the outer periphery side of the cooling jacket 21. Therefore, while the curtain air flows along the hollow pipes 158a to 158c, the heat of the curtain air is sufficiently conducted to the cooling medium previously supplied to the cooling jacket 21. As a result, the curtain air becomes relatively low in temperature. That is, in this embodiment, the curtain air can be lowered in temperature by the cooling jacket 21 for cooling the rotating electric machine 12 and the current converter 172. Therefore, it is not necessary to provide separate cooling equipment for cooling the curtain air in the gas turbine engine 200 and the rotating electric machine system 10. As a result, the size of the compound power system 300 can be reduced.

[0083] The curtain air that has flowed through hollow tube portion 158a flows into the internal space of casing 24 for the measuring device, as shown in Fig. 2. This forms an air curtain inside casing 24 for the measuring device. Excess curtain air flows into the hollow interior (internal space) of casing 22 for the terminal device via the inter-casing communication hole. An air curtain is formed inside casing 22 for the terminal device by this excess curtain air and the curtain air that has flowed through hollow tube portions 158b and 158c and flowed into the internal space of casing 22 for the terminal device.

[0084] 3, the excess curtain air in the terminal casing 22 flows into a storage chamber 114 formed in the main housing 16. Here, since the terminal casing 22 and the meter casing 24 are disposed to the left of the main housing 16, the curtain air flows in from the left end of the storage chamber 114. The curtain air then first enters the inner hole of the stator 32, i.e., the clearance between the outer peripheral wall of the cylindrical protrusion 96 and the insulating substrate 118.

[0085] A portion of the curtain air then flows toward the first shaft insertion hole 98. The remaining portion flows through the clearance between the outer wall of the permanent magnet 88 and the inner wall of the electromagnetic coil 116, in other words, along the storage chamber 114, toward the insertion hole 68. In this manner, the curtain air branches into a portion that flows toward the first shaft insertion hole 98 at the left end (first end) and a portion that flows toward the insertion hole 68 at the right end (second end). As can be seen from the above, the flow path of the curtain air has the internal spaces of the terminal casing 22 and the meter casing 24 on the upstream side and the storage chamber 114 of the main housing 16 on the downstream side.

[0086] The curtain air that flows to the first shaft insertion hole 98 side passes through the first bearing 92 disposed in the first shaft insertion hole 98. Meanwhile, the curtain air that flows to the insertion hole 68 side passes through the second bearing 94 disposed in the insertion hole 68. Both curtain air streams containing lubricating oil are then discharged, for example, through a lubricant drain path to an oil tank (neither shown), and separated into lubricating oil and air. The lubricating oil is supplied again to the first bearing 92 and the second bearing 94. Meanwhile, the air is discharged, for example, to the atmosphere.

[0087] The compressed air that passes between the shroud case 218 and the compressor wheel 230 without entering the bleed port 220 becomes combustion air, and proceeds into the diffuser 234 as shown in Fig. 8. The combustion air flows out from an outlet hole formed in the wall of the diffuser 234 into a combustion air flow passage 273 between the combustor 236 and the outer housing 204. The combustion air further passes through a relay hole 276 and the fine holes formed in the combustor 236, the clearance between the combustor 236 and the fuel supply nozzle 274, and the like, before entering the hollow interior of the combustor 236, i.e., the combustion chamber.

[0088] The combustor 236 is heated in advance, and fuel is supplied from a fuel supply nozzle 274 to its hollow interior (combustion chamber). The fuel is burned together with the combustion air to become high-temperature burnt fuel. When the burnt fuel is supplied from the delivery hole into the nozzle 238, it expands in the nozzle 238, causing the turbine wheel 232 to start rotating at high speed. An output shaft 250 is provided on the turbine wheel 232, and the compressor wheel 230 is fitted onto the output shaft 250. As the turbine wheel 232 rotates at high speed, the output shaft 250 and the compressor wheel 230 rotate together at high speed. The burnt fuel is discharged to the outside of the outer housing 204 through an exhaust pipe (not shown) provided at an exhaust port 280.

[0089] The ring member 256 interposed between the compressor wheel 230 and the turbine wheel 232 also serves as a seal member for sealing between the two wheels 230, 232. Moreover, as shown in FIG. 9, a plurality of labyrinth convex parts 264 are formed on the outer peripheral wall of the ring member 256, and the labyrinth convex parts 264 are in contact with the inner wall of a hole part 272 formed in the intermediate plate 266 (see FIG. 9). Compressed air generated by the compressor wheel 230 reaches the labyrinth convex parts 264 via the back surface of the compressor wheel 230. In addition, the combustion gas reaches the labyrinth convex parts 264 from the turbine wheel 232 side. As described above, the pressure of the compressed air is set higher than the pressure of the combustion gas. Therefore, the combustion gas is prevented from passing through the labyrinth convex parts 264 and flowing into the compressor wheel 230 side. For the reasons described above, the burnt fuel is prevented from entering the shaft hole 244 from between the wheels 230, 232, for example.

[0090] In Fig. 8, when the output shaft 250 starts rotating at high speed, the supply of current from the battery 170 (see Fig. 7) to the electromagnetic coil 116 is stopped. However, since the turbine wheel 232 is rotating at high speed due to the burnt fuel as described above, the output shaft 250 rotates integrally with the turbine wheel 232, and the rotating shaft 40 rotates integrally with the turbine wheel 232. At this time, sufficient rotational torque is transmitted from the output shaft 250 to the rotating shaft 40 for the same reason as described above.

[0091] As the rotating shaft 40 rotates while carrying the permanent magnet 88, an AC current is generated in the surrounding electromagnetic coil 116. The AC current is sent to a current converter 172 shown in Figs. 2 and 7 via a U-phase terminal 156a, a V-phase terminal 156b, and a W-phase terminal 156c. A conversion circuit 174 of the current converter 172 converts this AC current into a DC current. When a control circuit 178 of the current converter 172 determines that the output of an external load (e.g., a motor) electrically connected to the battery 170 has decreased, the control circuit 178 supplies a DC current to the battery 170 (see Fig. 7) via a capacitor 176. This charges the battery 170.

[0092] In this process, the conversion circuit 174 and the capacitor 176 in particular become heated among the current converter 172. However, in this embodiment, the device case 180 is positioned and fixed to the outer circumferential wall of the main housing 16, and the conversion circuit 174 and the capacitor 176 in the device case 180 are placed close to the cooling jacket 21. Therefore, the heat of the conversion circuit 174 and the capacitor 176 is quickly conducted to the cooling medium in the cooling jacket 21. This prevents the conversion circuit 174 and the capacitor 176 from becoming excessively hot.

[0093] 3, the rotation direction of the output shaft 250 and the rotating shaft 40 is preferably opposite to the rotation direction when the small cap nut 58, the large cap nut 60, and the male threaded portion 252 are screwed together. In this case, the small cap nut 58, the large cap nut 60, and the male threaded portion 252 are prevented from loosening during rotation of the rotating shaft 40. Note that the small cap nut 58, the large cap nut 60, and the male threaded portion 252 may be provided with a mechanism for preventing loosening in advance.

[0094] Here, the lubricating oil is supplied as a jet flow to the first bearing 92 and the second bearing 94 that rotatably support the rotating shaft 40 in the rotating electric machine housing 14. As a result, the first bearing 92 and the second bearing 94 are cooled by the lubricating oil, so that the occurrence of seizure in the first bearing 92 and the second bearing 94 can be suppressed. As described above, the rotating electric machine system 10 has a flow passage formed with the internal spaces of the terminal casing 22 and the measuring device casing 24 on the upstream side and the first bearing 92 and the second bearing 94 on the downstream side. In addition, the flow passage has a labyrinth seal structure, and the curtain air flows so as to pass through the labyrinth seal structure. For this reason, it is difficult for the lubricating oil to enter the internal spaces of the terminal casing 22 and the measuring device casing 24.

[0095] Moreover, an air curtain made of curtain air is formed in the internal space of the terminal casing 22 and the meter casing 24. Therefore, even if the lubricating oil enters the internal space of the terminal casing 22 and the meter casing 24, the lubricating oil is prevented from adhering to the U-phase terminal 156a, the V-phase terminal 156b, the W-phase terminal 156c, the thermistor 152, etc. For the above reasons, it is possible to effectively prevent the electrical terminal portion to which the battery 170 is electrically connected, the meter (thermistor 152), etc. from being soiled with the lubricating oil.

[0096] In addition, in the rotating electric machine system 10, the curtain air that has passed through the first bearing 92 and the second bearing 94 flows so as to be discharged to the outside of the rotating electric machine housing 14. Therefore, even if lubricating oil leaks from the first bearing 92 or the second bearing 94, the lubricating oil is carried along with the curtain air and discharged to the outside of the rotating electric machine housing 14. This makes it possible to prevent the leaked lubricating oil from heading toward the rotor 30 or remaining inside the rotor 30.

[0097] As the rotating shaft 40 rotates, the multiple permanent magnets 88 held in the large diameter portion of the outer shaft 36 rotate. This induces a current in the electromagnetic coils 116 (U-phase coil, V-phase coil, W-phase coil) facing the permanent magnets 88. This current is extracted as power for energizing an external device via the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c.

[0098] The electromagnetic coil 116 generates heat as current flows through it. Here, the curtain air before being branched comes into contact with the left end of the stator 32. Also, the curtain air passing through the storage chamber 114 and heading toward the insertion hole 68 along the longitudinal direction comes into contact with the outer and inner walls of the stator 32. That is, a sufficient amount of curtain air comes into contact with the left end of the stator 32, and the branched curtain air comes into contact with the entire outer and inner walls.

[0099] In addition, a cooling medium flows through a cooling jacket 21 provided on the main housing 16. The stator 32 including the electromagnetic coil 116, and therefore the rotating electrical machine 12, are quickly cooled by the curtain air and the cooling medium.

[0100] In the present embodiment, the rotating electric machine housing 14 (main housing 16) that houses the rotating electric machine 12 and the terminal casing 22 that houses the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are provided separately. Therefore, the influence of heat generated in the stator 32 in the main housing 16 is unlikely to reach the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c in the terminal casing 22. Since the terminals of the battery 170 (see FIG. 7) are electrically connected, the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c also generate heat. However, the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are quickly cooled by the curtain air supplied to the terminal casing 22.

[0101] In this way, the curtain air also serves to cool heat-generating locations in the rotating electric machine system 10. Since the electric terminals (U-phase terminal 156a, V-phase terminal 156b, W-phase terminal 156c), the electromagnetic coil 116, the permanent magnet 88, etc. are cooled, it is possible to prevent the heat from affecting the output control, etc. of the rotating electric machine system 10, and to prevent the excitation of the electromagnetic coil 116 and the permanent magnet 88 from being reduced due to heat, etc. As a result, the reliability of the rotating electric machine system 10 is improved.

[0102] Furthermore, since the main housing 16 that houses the rotating electric machine 12 and the terminal casing 22 that houses the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are provided separately, the rotating electric machine 12 and the electric terminal portion are separated from each other. Therefore, the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are not easily affected by vibrations that occur as the rotor 30 rotates. In other words, the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are protected from vibrations. Also, as described above, the curtain air prevents the first bearing 92 and the second bearing 94 from seizing up. Therefore, the rotating electric machine system 10 has excellent durability.

[0103] While the rotating shaft 40 rotates, the rotation angle (rotation parameter) of the rotating shaft 40 is detected by the resolver 140. Specifically, the resolver rotor 56 fitted onto the left end portion 46a of the inner shaft 34 rotates integrally with the rotating shaft 40. As a result, an electric signal generated in the resolver stator 130 is transmitted to a receiver electrically connected to a receiver connector 144. The receiver, which reads the electric signal, calculates the rotation angle of the rotating shaft 40 based on the electric signal and sends the result to a control device or the like (not shown). The control device or the like calculates the number of rotations based on this rotation angle.

[0104] The resolver 140 is disposed on a protruding tip 104 of the rotating shaft 40 that is exposed from the housing 14 for the rotating electric machine. Therefore, the resolver 140 is less susceptible to the effects of heat generated in the electromagnetic coil 116 of the stator 32 in the housing 14 for the rotating electric machine and vibrations generated with the rotation of the rotor 30. In addition, the first bearing 92 and the second bearing 94 that support the rotating shaft 40 are provided in the housing 14 for the rotating electric machine. Therefore, the housing 14 for the rotating electric machine suppresses the vibrations of the first bearing 92 and the second bearing 94. This also makes it difficult for the effects of vibrations to reach the resolver 140.

[0105] As described above, the transmission of heat and vibration is suppressed, thereby providing accurate detection results of the rotation angle by the resolver 140. In addition, the life of the resolver 140 is also extended.

[0106] For example, when replacing the resolver 140 with one having a larger inner diameter and outer diameter, the inner shaft 34 may be replaced with one having a larger diameter at the left end 46a. When a single solid rotating shaft is used as the rotating shaft 40, if the solid rotating shaft is replaced with one having a larger diameter in order to replace the resolver 140 with one having a larger inner diameter and outer diameter, it may be difficult to pass the solid rotating shaft through the first bearing 92 or the second bearing 94. As can be seen from this, by forming the rotating shaft 40 with the outer shaft 36 and the inner shaft 34, passing the outer shaft 36 through the first bearing 92 and the second bearing 94, and disposing the resolver rotor 56 on the part of the inner shaft 34 exposed from the outer shaft 36, it is possible to correspond to resolvers 140 having various inner diameters and outer diameters by replacing the inner shaft 34.

[0107] The present invention is not particularly limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention.

[0108] For example, in this embodiment, the resolver 140 is used as the rotation parameter detector, but it is also possible to use a detector including a Hall element.

[0109] Moreover, the curtain air may be circulated through the internal space of the casing for measuring device 24, and then through the internal space of the casing for terminal 22. Alternatively, the curtain air may be supplied separately to the casing for measuring device 24 and the casing for terminal 22, and the curtain air that has circulated through the internal spaces of the casings 22, 24 may be circulated separately into the storage chamber 114.

[0110] Furthermore, in the gas turbine engine 200, the compressor wheel 230 and the turbine wheel 232 may be arranged in the opposite direction to that shown in FIG. 8. That is, their positions may be swapped. In this case, the axial hole 244 may be formed in the turbine wheel 232, and the output shaft 250 may be provided in the compressor wheel 230. In addition, the compressor wheel 230 and the turbine wheel 232 may be of a centrifugal type or an axial type. As long as the compressor wheel 230 and the turbine wheel 232 are arranged coaxially, a combination of a multi-stage compressor wheel and a multi-stage turbine wheel that combines a centrifugal type and an axial type may be used.

[0111] 3, the rotating electric machine 12 constituting the rotating electric machine system 10 may be a motor in which the rotating shaft 40 rotates when electricity is applied to the electromagnetic coil 116. In this case, the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are electrical terminals that receive electric power from the battery 170.

[0112] The current converter may include a circuit for stepping down or stepping up the voltage of an AC or DC current.

[0113] Moreover, instead of the gas turbine engine 200 shown in FIG. 1 and the like, for example, another internal combustion engine such as a reciprocating engine may be adopted.

[0114] Furthermore, in the above embodiment, a part of the compressed air generated by the gas turbine engine 200 is diverted to use the gas turbine engine 200 as a gas supply source, but as shown in Fig. 2, an externally provided pump 290 can also be used as the gas supply source. In this case, air or the like can be compressed under the action of the pump 290 and supplied to the hollow tube portions 158a to 158c or the collecting passage 74. In this configuration, it is not particularly necessary to divert the compressed air from the gas turbine engine 200.

[0115] In addition, the configuration for transmitting torque between the rotating shaft 40 and the output shaft 250 is not particularly limited to the meshing of splines. For example, one or more convex portions may be provided on the outer peripheral wall of the rotating shaft 40 so as to protrude outward in the diametrical direction, while one or more concave portions may be formed on the output shaft 250, and the convex portions and the concave portions may be engaged with each other. Alternatively, the rotating shaft 40 may be formed in a polygonal shape, while a polygonal hole may be formed in the output shaft 250, and the rotating shaft 40 may be engaged with the polygonal hole. In the latter case, the outer peripheral wall of the rotating shaft 40 serves as an inner peripheral side engaging portion, and the inner peripheral wall of the polygonal hole serves as an annular outer peripheral side engaging portion. [Explanation of symbols]

[0116] 10... Rotating electric machine system 12... Rotating electric machine 14... Housing for rotating electrical machine 16... Main housing 18...First sub-housing 20...Second sub-housing 21...Cooling jacket 22...Terminal casing 24...Measuring instrument casing 26...Resolver holder 28...Cap cover 30...Rotor 32... Stator 34... Inner shaft 36...Outer shaft 40...Rotation shaft 48...First external thread portion 50...Flange portion 52: Stopper portion 54: Second external thread portion 56...Resolver rotor 58...Small cap nut 60...Large cap nut 62...Shaft connection hole 64... Female thread portion 66... ​​First inner spline 68...Insertion hole 70...Inner stopper 71...Outer stopper 74...Collecting flow path 76...Upstream communication hole 78...Relay communication passage 80a to 80c... downstream communication hole 82... flow straightening member 84...Through hole 85...First outer periphery spline 88...Permanent magnet 90...Magnet holder 92...1st bearing 94...2nd bearing 98...1st shaft insertion hole 100...2nd shaft insertion hole 104...protruding tip 114...storage chamber 116...electromagnetic coil 118...insulating substrate 122... Annular recess 124... Annular protrusion 126... hollow recess 130... resolver stator 140...Resolver 152...Thermistor 154...Harness 156a...U-phase terminal 156b…V phase terminal 156c…W phase terminal 158a to 158c: hollow tube portion 170: battery 172...current converter 174...conversion circuit 176: Capacitor 178: Control circuit 180...Device case 182...Power module 200... gas turbine engine 202... inner housing 204...Outer housing 206...Engine housing 208...first annular portion 210...second annular portion 212... leg portion 216... bleed passage 218...shroud case 220...air extraction port 230...Compressor wheel 232...Turbine wheel 234... diffuser 236... combustor 238...Nozzle 240...Intake space 242: Small diameter cylindrical portion 244: Shaft hole 246...Second outer circumferential spline 248...Inner flange portion 250...Output shaft 252...Male thread 254... second inner circumferential spline 256... ring member 258...Fitting hole 264...Labyrinth protrusion 268... Annular protrusion 270... Fitting protrusion 272: Hole 273: Combustion air passage 274...Fuel supply nozzle 276...Relay hole 290...Pump 300...Combined power system

Claims

1. a rotating electric machine system including a rotating electric machine and a rotating electric machine housing that rotatably supports a rotating shaft of the rotating electric machine; an internal combustion engine having an output shaft that rotates integrally with the rotary shaft; A hybrid power system comprising: the rotating shaft has a first end and a second end, and a first bearing and a second bearing are provided between the housing for the rotating electric machine and the first end and between the housing for the rotating electric machine and the second end, respectively, so that the rotating shaft is rotatably supported by the housing for the rotating electric machine via the first bearing and the second bearing; The rotating shaft has a hollow cylindrical outer shaft and an inner shaft removably inserted into the hollow interior of the outer shaft, the first end includes a protruding tip that passes through the first bearing and protrudes to an outside of the housing for the rotating electric machine, One end of the inner shaft is exposed from one end of the outer shaft to become the protruding tip, The one end of the inner shaft has an externally threaded portion having a thread formed on an outer circumferential surface thereof, The rotating electric machine system is a composite power system having a cap nut that is threadedly engaged with the external threaded portion and that constrains one end of the inner shaft and one end of the outer shaft to each other.

2. 2. The composite power system according to claim 1, wherein the outer thread portion has a larger diameter than the one end of the outer shaft, and an end face of the one end of the outer shaft faces an end face of the outer thread portion, The cap nut covers an outer peripheral surface of the one end of the outer shaft with the end face of the one end of the outer shaft facing the one end face of the external threaded portion.

3. 3. The compound power system according to claim 1, further comprising a rotation parameter detector provided at the protruding tip for detecting a rotation parameter of the rotating shaft.

4. 4. The composite power system according to claim 3, further comprising a detector holder for supporting said rotation parameter detector and detachably attached to said housing for said rotating electric machine, A composite power system, wherein the detector holding member is provided with a receiver connector for electrically connecting the rotation parameter detector to a receiver that receives a signal emitted by the rotation parameter detector.

5. 5. The composite power system according to claim 3, wherein the rotation parameter detector is a resolver having a resolver rotor and a resolver stator, the resolver rotor being fitted onto the protruding tip.

6. A composite power system as described in claim 5, wherein a second cap nut is provided at the protruding tip on a side away from the internal combustion engine than the cap nut, and the resolver rotor is arranged between the cap nut and the second cap nut.

7. A composite power system according to any one of claims 1 to 6, further comprising a terminal casing housing an electrical terminal portion for transmitting and receiving electric power between the rotating electric machine and an external device, the terminal casing being provided on a side wall of a housing for the rotating electric machine.

8. 8. The composite power system according to claim 7, further comprising a casing for a measuring device, adjacent to said casing for terminals, and housing a temperature measuring device for measuring the temperature of said rotating electric machine.

9. 9. A complex power system according to claim 1, wherein the internal combustion engine is a gas turbine engine having a compressor wheel and a turbine wheel, the compressor wheel and the turbine wheel being supported on the output shaft.

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