JP3587350B2 - Turbocharger with generator / motor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a turbocharger provided with a generator / motor for supercharging intake air and converting exhaust gas energy into electric energy to recover energy.
[0002]
[Prior art]
In general, a turbocharger uses a turbine driven by exhaust gas energy of an engine to drive a compressor to supercharge intake air for the purpose of improving output during high-speed rotation and high-load operation of the engine. . Some engines equipped with a turbocharger are provided with a turbocharger having a turbine driven by exhaust gas energy, a shaft equipped with the turbine, and a compressor attached to the shaft. In addition, an energy recovery device including a turbine driven by exhaust gas energy, a shaft mounted with the turbine, a compressor mounted on the shaft, and a generator / motor mounted on the shaft has been proposed for a turbocharger provided in the engine. ing. In addition, a heat-insulated engine equipped with a turbocharger has been proposed in which a turbocharger having a generator / motor is disposed in an exhaust system and an energy recovery device having a power generation turbine is disposed downstream of the turbocharger. .
[0003]
There is a turbocharger provided with a power generator and a motor as a means for recovering exhaust gas energy as electric energy by driving a turbine by exhaust gas energy of a vehicle engine and generating electric power by a generator connected to the turbine. FIG. 4 is a cross-sectional view showing a conventional turbocharger provided with a generator / motor. The turbocharger 60 shown in FIG. 4 includes a turbine 2 driven by exhaust gas energy of an engine, a shaft 4 having the turbine 2 mounted thereon, and a compressor 3 mounted on the shaft 4. The housing of the turbocharger 60 includes a turbine housing 12 that houses the turbine 2, a compressor housing 13 that houses the compressor 3, and a center housing 8 that is located between the turbine housing 12 and the compressor housing 13 and connects the two housings 12 and 13. Have been. The shaft 4 penetrating the housing is rotatably supported by bearings 10 and 11 provided at both ends of the center housing 8. A turbine blade 7 is attached to the shaft 4 at an end on the turbine 2 side, and a compressor blade 9 is attached to an end on the compressor 3 side. The center housing 8 includes a turbine side center housing 14 fixed to the turbine housing 12 and a compressor side center housing 15 to which the compressor housing 13 is fixed. A heat shield plate 28 is interposed between the turbine housing 12 and the turbine side center housing 14.
[0004]
The exhaust gas sent to the turbine scroll 6 through the exhaust pipe of the engine is supplied to the turbine 2 of the turbocharger 60 to rotate the turbine blade 7. The rotation of the turbine blade 7 is transmitted to the compressor 3 via the shaft 4, and the compressor 3 rotates the compressor blade 9 to supercharge, that is, compresses air and supplies the air to the engine.
[0005]
Since the shaft 4 rotates at a high speed of 100,000 to 200,000 rpm and generates an axial force in the thrust direction, the shaft 4 is stably supported not only in the radial direction but also in the thrust direction. As the bearings 10 and 11 that support the shaft 4, angular ball bearings are employed. Further, lubricating oil is supplied to the bearings 10 and 11 in order to enable the shaft 4 to rotate at high speed. The lubricating oil is supplied through an oil supply passage 45 formed in the center housing 14 on the turbine side and the center housing 15 on the compressor side. You.
[0006]
The generator 5 of the turbocharger 60 including the generator / motor is housed in the turbine side center housing 14 between the turbine 2 and the compressor 3. The generator 5 includes a rotor 16 composed of a permanent magnet attached to the shaft 4 driven by exhaust energy and rotating together with the shaft 4, a stator 17 mounted around the rotor 16 by press-fitting into the center housing 8. Consists of The stator 17 is configured by attaching a winding to a stator core. The rotor 16 is disposed between bearings 10 and 11 that support the shaft 4. The generator 5 converts a part of the output of the turbine 2 driven by the exhaust gas into electric energy, and drives the motor attached to the engine with the electric power, thereby realizing the recovery of the exhaust gas energy and the fuel efficiency. Is being improved. In order to prevent the rotor 16 from bursting during high-speed rotation, a reinforcing sleeve 18 made of carbon fiber reinforced plastic as a reinforcing member is fitted around the rotor 16. The turbine-side center housing 14 includes a turbine near portion 25 close to the turbine 2 side, a cylindrical stator mounting portion 27, and a connecting portion 26 for connecting the turbine near portion 25 and the stator mounting portion 27. Is press-fitted to the cylindrical inner surface 19 of the cylindrical stator mounting portion 27.
[0007]
Since the turbine-side center housing 14 is connected to the turbine housing 12 into which high-temperature exhaust gas from the engine is introduced, the temperature easily rises due to heat conduction from the turbine housing 12 that becomes high during operation of the turbocharger. Further, in the turbocharger 60 provided with the electric generator / motor, the shaft 2 becomes hot because the turbine 2 is driven by the flow of the exhaust gas. The permanent magnet, which is the rotor 16 mounted on the shaft 4, may also be heated to a high temperature by the heat transmitted from the shaft 4 and demagnetized. The lubricating oil also has a cooling function to prevent the bearing 10 from becoming hot due to heat or the like transmitted from the turbine side.
[0008]
When assembling a turbocharger equipped with a generator / motor, first, balance is made on each of the components constituting the rotating part of the turbocharger, such as the turbine 2, the compressor 3, and the rotor 16 to be a permanent magnet. Of the parts thus balanced, the rotating parts of the turbocharger, namely, the turbine 2, rotor 16, bearings 10, 11, spacers 76, sleeve 77, compressor 3, and shaft end nut 78 are connected to the shaft. Assemble to 4. In this state, the bending check and the balance correction of the shaft 4 and the assembly assembled to the shaft 4 are performed. The sleeve 77 and the shaft end nut 78 constitute fixing means for fixing the compressor blade 9 to the shaft 4.
[0009]
The assembly whose balance has been corrected and assembled on the shaft 4 is once disassembled, and only the rotor 16 is magnetized by the magnetizing device. The shaft 4 is inserted again into the center housing 8, and then the rotor 16, which has been magnetized to become a permanent magnet, as well as the spacers 76, the bearings 10, 11, and the sleeve 77 are assembled. At this time, the rotor 16 that has become a permanent magnet is attracted to the stator 17 and the center housing 8 made of magnetic metal, which makes it difficult to assemble the rotor 16 or that the rotor 16 is When attracted to the center housing 8, fragments of the permanent magnet may be generated and may enter a part such as a bearing that requires high sealing performance. In the case of an assembly constituted by assembling the shaft 4 and a rotating part around the shaft, the balance as the rotating body is once taken and then disassembled and reassembled. Balance may easily occur, and it may be difficult to rotate the turbocharger at high speed.
[0010]
Conventionally, a turbocharger is provided with a generator / motor of a type in which a generator section is disposed at a portion of a shaft supported by a center housing on a side protruding from a side opposite to a turbine housing. By shifting the magnetic center position of the constructed rotor from the magnetic center position of the stator core and applying a magnetic force to the rotating rotor from the stator core in the thrust direction, the cylindrical tube and the cylindrical magnetic poles are rotated. There is a rotor in which the balance of the rotor is improved by absorbing backlash caused by the difference in the centrifugal force and the coefficient of thermal expansion acting between the rotors (see Japanese Patent Application Laid-Open No. 2-298627).
[0011]
As an example of a turbocharger that drives a generator with the driving force obtained by a turbine, the amount of exhaust gas can be reduced by supplying exhaust gas to a large or small turbine arranged coaxially according to the rotation speed of the rotating shaft. In order to maintain the turbine efficiency at a high level (see Japanese Patent Application Laid-Open No. 2-181515).
[0012]
Further, as another example of a turbocharger provided with a generator / motor, a hollow shaft having a hollow shaft rotatable on the same central axis and independently of the shaft is provided on the outer periphery of the shaft, and a turbine for a generator is mounted on the outer shaft. And a rotor of a generator (JP-A-6-288242). In this turbocharger, a turbine for driving a compressor and a turbine for a generator are arranged in series along the flow of exhaust gas. The outer shaft for the casing and the shaft for the outer shaft are rotatably supported by bearings. The shaft is rotatably supported also in the thrust direction with respect to the center housing via a thrust bearing attached to the shaft by a nut. Further, the outer shaft is rotatably supported in the thrust direction by a center housing via a thrust bearing.
[0013]
[Problems to be solved by the invention]
A problem that arises with the above assembling work is that a rotor composed of a magnetic material that has not yet been magnetized is assembled together with other rotating parts, and then the rotor assembly is disassembled, and the rotor is magnetized. This is due to the reassembly of the solid. Therefore, by enabling the main rotating part including the magnetized rotor and the shaft to be integrated into the center housing in an integrated state, the work of disassembling and reassembling the assembly becomes unnecessary. There is a problem to be solved in obtaining a turbocharger equipped with a generator / motor capable of increasing the efficiency of assembly work.
[0014]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION An object of the present invention is to provide a turbocharger having a generator / motor for converting energy of exhaust gas discharged from an engine into electric energy and recovering the energy of the exhaust gas in the form of electric energy. The main rotating part including the rotor and the shaft is assembled and inserted from one side of the housing so that the rotor can be assembled to the housing. It is an object of the present invention to provide a turbocharger including a power generator and a motor that can prevent the collision with the rotor and the like, and make it possible to assemble the turbocharger with a good balance of the rotating body assembly.
[0015]
The present invention relates to a turbine disposed in a housing and driven by exhaust gas energy, a compressor disposed in the housing, a shaft connecting the turbine and the compressor, and a pair of bearing supports formed in the housing. Bearings respectively disposed on the shaft, rotatably supporting the shaft, a generator / motor rotor mounted on the shaft between a pair of the bearings, and the rotor surrounding the rotor. A stator mounted in the housing, which is fitted into a recess formed in at least one end wall of the housing at a position closer to the shaft end than the bearings to seal between the shaft and the housing. The bearing support portion on the side where the concave portion is formed has a larger inner diameter than the outer diameter of the rotor. Is set to have value, and relates to the concave portion of the inner diameter turbochargers with motor-generator made of it is set to a value larger than the inside diameter of the bearing support portion of said housing.
[0016]
According to the turbocharger provided with this generator / motor, the outer diameter of the rotor, the inner diameter of the bearing support on the side where the recess is formed, and the inner diameter of the recess formed in the housing are large and small as described above. Because the relationship has been established, the main rotating part, including the magnetized rotor and shaft, is supported in one end wall of the housing by bearing the shaft and rotor from one end wall of the housing in a rotationally balanced assembled state. It can be inserted into the housing through the inside of the part. Since the rotating part is assembled by operating the shaft, the rotor is prevented from colliding with the housing or the like when the magnetized rotor is assembled into the housing. Further, the rotating body assembly is assembled to the turbocharger in a state where the rotation balance is improved. When the bearing located between the rotor and the seal member is mounted on a bearing support formed on one end wall of the housing, the seal member is fitted into a recess formed on the end wall of the housing. .
[0017]
The seal member includes a seal plate disposed to be slidable relative to the shaft, and a seal ring disposed in a circumferential groove formed in the shaft and disposed to be slidable relative to the seal plate. is there.
[0018]
The housing comprises a turbine housing having the turbine disposed therein, a compressor housing having the compressor disposed therein, and a center housing having the turbine housing and the compressor housing fixed to both ends, respectively. The center housing includes a turbine-side center housing and a compressor-side center housing. One of the bearings is disposed on one of the bearing support portions formed on the turbine-side center housing, and is formed on the compressor-side center housing. The other bearing is disposed on the other bearing support portion.
[0019]
A turbine blade forming the turbine or a compressor blade forming the compressor is provided between a sleeve mounted on the shaft so as to be able to abut the bearing and a shaft end screw screwed to a shaft end of the shaft. It is mounted on the shaft in a sandwiched state.
[0020]
Only one of the turbine blade and the compressor blade is attached to the shaft, and one of the seal members corresponding to the turbine blade or the compressor blade attached to the shaft and the rotor are attached to the shaft. In this state, the rotating body assembly is assembled, and the rotating body assembly is assembled by inserting the rotating body assembly into the housing from one of the end walls of the housing to which one of the seal members is fitted.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a turbocharger including a generator / motor according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a turbocharger provided with a generator / motor according to the present invention. In the turbocharger provided with the generator / motor shown in FIG. 1, the same components as those of the turbocharger 60 provided with the generator / motor shown in FIG. The detailed description to be performed is omitted.
[0022]
In the turbocharger 1 equipped with a generator / motor shown in FIG. 1 (hereinafter, abbreviated as “turbocharger 1” in the description of the embodiment), a shaft 4 that is a solid shaft is a turbine-side center housing 14 and a compressor-side center housing. 15 are rotatably supported by bearings 10 and 11 which are angular type ball bearings provided respectively. The bearings 10 and 11 are arranged at a sufficient distance from each other in the axial direction of the shaft 4 so that the rotor 16 can be arranged between the bearings 10 and 11. Are regulated by a spacer 76 disposed between the two. The stator 17 generates an electromotive force in accordance with a change in magnetic flux of the permanent magnet, which is the rotor 16, as the shaft 4 rotates. In the turbocharger 1, an exhaust gas flow is introduced into the turbine housing 12 through the exhaust turbine scroll 6, and rotates the turbine blade 7 fixed to one end of the shaft 4.
[0023]
An annular recess formed by an inner peripheral surface 46 and an end surface 47 is formed in the end wall 14b of the turbine side center housing 14 on the turbine 2 side, and a seal plate 49 is press-fitted into the recess from the turbine 2 side. Have been. A seal ring 53 is provided in a circumferential groove formed in the shaft 4, and has a sealing function of slidingly contacting a seal plate 49 to prevent the lubricating oil that has lubricated and cooled the bearing 10 from leaking to the turbine 2 side. Have. Lubricating oil from an oil supply passage 45 formed in the turbine side center housing 14 is jetted toward the bearing 10 to lubricate and cool the bearing 10. A damper ring 30 is mounted on the inner peripheral surface of the turbine side center housing 14 between the bearing 10 and the seal plate 49. The damper ring 30 supplies a part of the lubricating oil supplied to the bearing 10 for lubrication and cooling to a gap between the turbine side center housing 14 and the seal plate 49. The vibration of the shaft 4 is alleviated and absorbed by the buffering and damping action of the oil film formed by the lubricating oil in these gaps, thereby enabling the shaft 4 to rotate at high speed. Also on the bearing 11 side, a damper ring 30 having the same structure is arranged between the bearing 11 and the compressor side center housing 15.
[0024]
Since the turbine 2 is driven by the flow of the exhaust gas, the temperature of the shaft 4 becomes high, and the temperature of the permanent magnet, which is the rotor 16 mounted on the shaft 4, may become high and demagnetize. The lubricating oil injected toward the bearing 10 also serves to cool the shaft 4. The lubricating oil that is jetted toward the bearing 10 also transmits heat to the seal ring 53 of the seal plate 49, and releases the heat of the shaft 4 to the turbine side center housing 14. In order to improve the cooling performance, a turbine-side water jacket 55 into which cooling water is introduced is formed in a turbine-side portion 25 located on the turbine-side center housing 14 on the side closer to the turbine 2.
[0025]
The stator 17, which is a stator coil, generates heat due to a change in magnetic flux crossing the stator 17 and a current flowing through the coil of the stator 17, and as a result, the power generation performance of the stator 17 is reduced and sufficient power is generated. May not be possible. To cope with such a situation, a water jacket 57 is formed inside the stator mounting portion 27 of the turbine side center housing 14 to which the stator 17 is mounted so as to surround the stator 17. In this embodiment, the water jacket 57 passes through a communication passage 56 formed inside the connecting portion 26 that integrally connects the turbine vicinity portion 25 of the turbine side center housing 14 and the stator mounting portion 27. It communicates with the turbine-side water jacket 55 formed in the turbine vicinity 25.
[0026]
The turbine vicinity 25 is forcibly cooled by the cooling water flowing through the turbine-side water jacket 55. Therefore, the temperature of the bearing 10 and the shaft 4 does not become high, and the durability of the bearing 10 and the lubricating oil is not reduced, and the permanent magnet of the rotor 16 is not demagnetized. Since the cooling water flowing through the turbine-side water jacket 55 also flows through the water jacket 57 formed inside the stator mounting portion 27 through the communication passage 56, the cooling water in the water jacket 57 is The mounting portion 27 is forcibly cooled to prevent the efficiency of the power generated from the stator 17 from being reduced.
[0027]
The turbocharger 1 itself operates as follows. In the turbocharger 1, when exhaust gas from an engine (not shown) is introduced from the turbine scroll 6 into the turbine housing 12, the exhaust gas acts on the turbine blades 7 to drive the turbine 2. When the turbine 2 is driven, the compressor 3 is driven through the shaft 4, and the compressor air is supercharged to the engine by rotating the compressor blade 9 of the compressor 3. The permanent magnet as the rotor 16 attached to the shaft 4 rotates, and the generator 5 is set to generate power. The generator 5 generates an amount corresponding to consumption or power storage according to the operation state of the engine, but when the power is not used, the rotor 16 only idles.
[0028]
Next, a procedure for assembling a turbocharger including the generator / motor according to the present invention will be described with reference to FIGS. FIG. 2 is an explanatory view showing the magnetizing process of the rotor of the turbocharger shaft assembly provided with the generator / motor shown in FIG. 1, and FIG. 3 is an assembly procedure of the turbocharger provided with the generator / motor according to the present invention. FIG.
[0029]
First, a temporary assembly component that constitutes at least a rotating portion of the turbocharger 1 including the unmagnetized rotor 16 and the shaft 4 is assembled to assemble a shaft temporary assembly (step 1 in FIG. 3). Before assembling the rotating part of the turbocharger, the seal plate 49, the seal ring 53 and the damper ring 30 are assembled to the shaft 4. Thereafter, the tentatively assembled parts constituting at least the rotating part of the turbocharger 1 are assembled by sequentially attaching them around the shaft 4 so as to have the same positional relationship as the completed turbocharger. That is, the bearing 10, the one spacer 76, the non-magnetized rotor 16, the other spacer 76, and the bearing 11 are sequentially mounted on the shaft 4, and the sleeve 77 and the compressor blade 9 are sequentially mounted outside the bearing 11 in order. By tightening the shaft end nut 78, the compressor blade 9 is sandwiched between the sleeve 77 and the temporary shaft assembly. The shaft temporary assembly corresponds to a rotating body assembly 90 shown in FIG. 2 to which a sleeve 77, a compressor blade 9 and a shaft end nut 78 are attached.
[0030]
Next, the balance of the rotating portion of the shaft temporary assembly is corrected, and the rotating portion of the turbocharger is balanced to enable high-speed rotation (step 2). By keeping the rotation balance, the rotating parts such as the shaft 4 and the rotor 16 can rotate at high speed without generating vibration on the shaft.
[0031]
Next, the sleeve 77, the compressor blade 9, and the shaft end nut 78 are removed from the temporary shaft assembly to form a rotor assembly 90 (step 3), and the rotor 16 still attached to the shaft 4 is shown in FIG. (Step 4). The magnetizing device 91 includes a magnetizing yoke 93 to which power is supplied from a magnetizing power supply 92. The rotor 16 is magnetized by strong lines of magnetic force generated from the magnetized yoke 93. Here, since the inner races (inner rings) of the bearings 10 and 11 are attached to the shaft 4 by press fitting, the rotor 16 and the spacer 76 do not move in the axial direction with respect to the shaft 4.
[0032]
When the magnetization of the rotor 16 is completed, the rotor assembly 90 with the rotor 16 attached to the shaft 4 is assembled to the turbine side center housing 14. Since the rotating body assembly 90 has been assembled, the seal plate 49 assembled on the shaft 4 is pressed into the inner peripheral surface 46 of the turbine side center housing 14 of the center housing 8 until the end surface 47 is brought into contact with the seal plate 49 ( Step 5). Thereafter, the compressor-side center housing 15 is fitted and attached to the turbine-side center housing 14 (step 6), and the detached sleeve 77, compressor blade 9 and shaft end nut 78 are mounted on the shaft 4. This completes the assembly of the turbocharger 1 (step 7).
[0033]
As shown in FIG. 1, when the reinforcing sleeve 18 for preventing burst is fitted to the outer diameter of the rotor 16 or the outer periphery of the rotor 16, the outer diameter d of the reinforcing sleeve 18 is used. ₁ Is the inner diameter d of a bearing support portion 14a formed in the turbine side center housing 14 to accommodate the bearings 10, 11 and the damper ring 30. ₂ It is set smaller than. Therefore, the rotating body assembly 90 can be loaded into the turbine-side center housing 14 through the bearing support 14a from the turbine 2 side as viewed in FIG. Further, the outer diameter d of the seal plate 49 ₃ Is the inner diameter d of the bearing support 14a. ₂ When the seal plate 49 is pressed into the inner peripheral surface 46 of the turbine side center housing 14, the loading of the rotating body assembly 90 into the turbine side center housing 14 is completed.
[0034]
In the above embodiment, the AC machine including the rotor 16 and the stator 17 has been described as a generator. However, when the AC machine is used as an electric motor by supplying a current to the stator 17 and the exhaust gas of the engine cannot be sufficiently used. For example, supercharging by driving a compressor may be performed by an electric motor. In the above embodiment, the rotating body assembly 90 is loaded from the turbine 2 side. However, the rotating body assembly 90 may be loaded from the compressor 3 side. In this case, a rotating body assembly with the compressor blade 9 attached to the shaft 4 is assembled, and the seal plate 49 is provided on the compressor 3 side. Further, the structure is changed to a structure in which the seal plate 49 is pressed into the bearing support portion 15a of the compressor-side center housing 15.
[0035]
【The invention's effect】
The turbocharger including the generator / motor according to the present invention is configured as described above and has the following effects. That is, in the turbocharger equipped with this generator / motor, the main rotating part including the magnetized rotor and the shaft can be inserted into one of the housings and assembled to the housing while the main rotating parts are assembled. When the magnetized rotor is assembled to the housing, the rotor can be prevented from colliding with the housing or the like, and the turbocharger can be assembled in a state in which the balance of the rotor assembly is improved. Since the rotating body assembly is mounted on the center housing in a state in which the rotational balance is improved, the rotating part of the turbocharger after the mounting does not have an imbalance, and can be operated at a high speed.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a turbocharger provided with a generator / motor according to the present invention.
FIG. 2 is an explanatory diagram showing a magnetizing step of a rotor of a turbocharger provided with a generator / motor according to the present invention.
FIG. 3 is a flowchart showing an assembling procedure of a turbocharger including a generator / motor according to the present invention.
FIG. 4 is a cross-sectional view showing a conventional turbocharger provided with a generator / motor.
[Explanation of symbols]
1 Turbocharger with generator / motor
2 turbine
3 Compressor
4 shaft
5 Generator
7 Turbine blade
8 Center housing
9 Compressor blade
10,11 Bearing
12 Turbine housing
13 Compressor housing
14 Center housing on turbine side
14a Bearing support
15 Center housing on compressor side
15a Bearing support
16 rotor
17 Stator
18 Reinforcement sleeve
30 Dampering
46 Inner surface
47 End face
49 Seal plate
53 Seal ring
76 Spacer
77 sleeve
78 Shaft end nut
90 Rotating body assembly

Claims (4)

A turbine disposed in the housing and driven by exhaust gas energy, a compressor disposed in the housing, a shaft connecting the turbine and the compressor, and a pair of bearing support portions formed in the housing. A bearing for rotatably supporting the shaft, a rotor for power generation and electric power mounted on the shaft between the pair of bearings, and mounted in the housing so as to surround the outside of the rotor. And a sealing member fitted to a recess formed in at least one end wall of the housing at a position closer to the shaft end than the bearings to seal between the stator and the shaft. The inner diameter of the bearing support portion on the side where the recess is formed is set to a value larger than the outer diameter of the rotor. It is, and turbocharger inner diameter of the recess of the housing with a motor-generator which consists of being set to a value larger than the inside diameter of the bearing support. The seal member includes a seal plate disposed slidably relative to the shaft, and a seal ring disposed in a circumferential groove formed in the shaft and disposed slidable relative to the seal plate. A turbocharger comprising the power generator / motor according to claim 1, comprising: The housing includes a turbine housing in which the turbine is disposed, a compressor housing in which the compressor is disposed, and a center housing in which the turbine housing and the compressor housing are fixed to both ends, respectively. The center housing includes a turbine-side center housing and a compressor-side center housing. One of the bearings is disposed on one of the bearing support portions formed on the turbine-side center housing, and is formed on the compressor-side center housing. The turbocharger provided with the generator / motor according to any one of claims 1 to 3, wherein the other of the bearings is disposed on the other of the bearing support portions. A turbine blade constituting the turbine or a compressor blade constituting the compressor is disposed between a sleeve mounted on the shaft so as to be able to abut the bearing and a shaft end screw screwed to a shaft end of the shaft. The turbocharger provided with the power generator and the electric motor according to any one of claims 1 to 3, wherein the turbocharger is mounted on the shaft in a sandwiched state.

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