JP2016196873A - Electrically-driven assist turbocharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically-driven assist turbocharger having such a structure as one in which a rotor part is approached near a bearing part for supporting a turbo shaft and an electric motor can be efficiently cooled.SOLUTION: There are provided a plurality of vanes that are formed continuously between a disk part surface side and a hub part of a compressor impeller. The disk part surface side provided with the plurality of vanes is enclosed by a compressor housing. A cylindrical-shaped permanent magnet table integrally constituted at a disk part rear surface side of the compressor impeller is provided with a rotor part where N pole permanent magnets and S pole permanent magnets are alternatively arranged, installed in a cylindrical shape and fixed at an annular outer peripheral surface of yoke through the annular yoke, a stator is arranged and fixed at a first division plate at a specified position that is enclosed by the outer peripheral surface of the rotor part and a stator tooth extremity end surface with a specified clearance. An electric motor constituted by the rotor part and the stator is stored at a motor housing partitioned against the compressor housing by the first partition plate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrically assisted turbocharger capable of obtaining a high torque in a low rotation range.

  In recent years, the application rate of turbochargers is increasing as a means for reducing the size and weight of engines by downsizing the engine, improving efficiency, and strengthening exhaust gas and fuel regulations.

  The turbocharger is configured by connecting a turbine impeller and a compressor impeller with a turbine shaft, the turbine impeller is driven by exhaust gas energy discharged from the internal combustion engine, and the compressor impeller connected to the turbine impeller drives the driving force of the turbine impeller. This device is designed to increase the output of the internal combustion engine, improve fuel efficiency, and reduce harmful gas emissions by supplying air flow with increased air density into the combustion chamber by rotating and sucking air. .

  In order to increase the output of the internal combustion engine, improve fuel consumption, and reduce harmful gas emissions, it is essential to supply sufficient air in each rotation region of the internal combustion engine.

  Conventionally, in order to supply sufficient air to each rotation region of an internal combustion engine, the shape of the turbine impeller and compressor impeller is optimized, and the amount of exhaust gas energy supplied to the turbine impeller is adjusted in each rotation region. Various improvements have been made. In particular, an electric assist turbocharger having an electric motor that assists the rotational force of the compressor impeller has been developed.

Problems to be solved by the invention

  However, in the recently developed electric assist turbocharger, the rotor portion is provided on the turbo shaft between the bearing housing and the compressor housing, and the stator is surrounded and fixed around the outer peripheral surface of the rotor portion. Since the motor is housed in a motor case located between the bearing housing and the compressor housing, the rotor portion and the compressor impeller are located away from the bearing portion that supports the turboshaft. There is a problem that high-speed rotation cannot be maintained due to an increase in eccentricity and vibration of the compressor section and the compressor impeller.

  Accordingly, the present invention has been made to solve the above problems, and an electric assist turbocharger having a structure in which the rotor portion is brought close to the bearing portion supporting the turbo shaft and the electric motor can be efficiently cooled. The purpose is to provide.

Means for solving the problem

  In order to achieve the above object, a first aspect of the present invention includes a plurality of vanes continuously formed between a disk portion surface side of a compressor impeller and a hub portion, and the disk portion surface side including the plurality of vanes is disposed on a compressor side. A cylindrical permanent magnet base that surrounds the housing and is integrally formed on the back side of the disk portion of the compressor impeller, and N-pole and S-pole permanent magnets are alternately arranged on the outer circumferential surface of the annular yoke via an annular yoke. The rotor portion is arranged and fixed in a cylindrical shape, and the stator is disposed and fixed on the first partition plate in a fixed position surrounding the outer peripheral surface of the rotor portion and the tip end surface of the stator tooth with a certain gap. An electric motor composed of a stator is housed in a motor housing that is partitioned from the compressor housing by the first partition plate, and a shaft that supports the turbine shaft is accommodated. The motor housing that is integrally formed with one of the ring housings is integrated with the compressor housing that is disposed and fixed in the intake passage surrounding the compressor impeller via the first partition plate, and the turbine impeller is provided on the other bearing housing. A turbine housing that is disposed in the enclosed exhaust passage and into which exhaust gas is introduced is disposed and fixed so as to be integrated.

  According to a second aspect of the present invention, a hollow chamber formed in a hollow and cylindrical shape with an opening on the bearing housing side is provided in the permanent magnet base integrally formed on the same radius on the back side of the disk portion of the compressor impeller, and a turbine shaft is provided. A central protrusion on the compressor portion side of the bearing housing to be supported is positioned so as to enter into the hollow chamber.

  According to the third aspect of the present invention, the transmission is partitioned from the motor housing by a second partition plate that is provided on the bearing housing side in the motor housing so as to open a communication port that surrounds and surrounds the central protrusion of one of the bearing housings. It has a heat shield room.

  According to a fourth aspect of the present invention, a first air outlet that opens into the intake pipe is provided in a downstream intake pipe of an intercooler disposed in the intake passage, and an air inlet that opens into the motor housing is provided in the motor housing, The first air outlet and the air inlet are communicated with an inlet pipe, the second air outlet opening in the heat transfer shielding chamber is provided in the heat transfer shielding chamber, and the intake air is provided in the upstream intake pipe of the compressor housing disposed in the intake passage. An air discharge port that opens in the tube is provided, and the second air outlet and the air discharge port communicate with each other through a discharge tube.

  According to a fifth aspect of the present invention, there is provided a stator having an armature winding laminated with a plurality of silicon steel plates, wherein the stator teeth first fold is formed with the end portion on the rotor portion side of the stator teeth armature winding as a first fold position. The front end of the stator teeth on the rotor portion side of the first fold position ahead is the second fold position, and the second fold position ahead is the stator core. It is formed by bending so as to form a parallel surface with the back surface and the stator teeth surface.

Effect of the invention

  In the electric assist turbocharger of the present invention (Claim 1), by adopting the configuration according to Claim 1, the electric impeller function by the electric motor to the compressor impeller is provided, and the rotor portion constituting the electric motor is provided. Since the compressor impeller is integrated on the back side of the disk, the compressor impeller body including the rotor can be made compact and lightweight, resulting in the generation of vibration amplitude of the rotating body and the rotating body (turbine shaft). It is possible to suppress a radial load or the like applied to the bearing portion that supports and maintain high-speed rotation. Further, the compressor impeller itself is cooled by the air flow sucked by the compressor impeller, and further, the permanent magnet base that is integrated with the compressor impeller is also cooled. Therefore, since each of the N pole and S pole permanent magnets arranged and fixed on the permanent magnet base is also cooled, irreversible demagnetization of each permanent magnet can be prevented.

  In addition, in the electrically assisted turbocharger (Claim 2), when the size of the electrically assisted turbocharger is increased by adopting the configuration according to Claim 2, around the central protrusion on the compressor portion side in the bearing housing, Since the rotor part composed of the N pole and S pole permanent magnets fixed to the permanent magnet base via an annular yoke closes and overhangs, the radial load applied to the turbine shaft is applied to the turbine shaft. Can be brought close to the bearing portion side of the bearing housing that supports the bearing, and a high-speed rotation can be maintained by suppressing a radial load or the like.

  Further, in the electrically assisted turbocharger [Claim 3], by adopting the configuration according to Claim 3, it becomes difficult to transfer the heat transfer from the turbine section to the N-pole and S-pole permanent magnets. While preventing the irreversible demagnetization of a magnet, the fall of the driving force by the heat of an electric motor can be prevented.

  Further, in the electrically assisted turbocharger (Claim 4), by adopting the configuration according to Claim 4, the air flowing in the downstream intake pipe of the intercooler disposed in the intake passage is caused to flow into the motor housing, and the motor housing and Compared to the method of cooling the motor housing with engine cooling water to cool the electric motor by air, the motor housing and the electric motor directly at a lower temperature (specifically, mainly the u-phase of the stator and stator teeth, v-phase and w-phase armature windings and rotor portions] can be cooled, and in particular, a reduction in the driving force of the electric motor can be prevented. After that, the heat of the heat transfer shielding chamber wall is taken away by the air flow flowing into the heat transfer shield chamber to cool the heat transfer shield chamber, and it is difficult to transfer the heat transfer from the turbine section to the N pole and S pole permanent magnets. Thus, irreversible demagnetization of the permanent magnet due to heat transfer can be prevented.

  Further, in the motor housing, an inflow due to a pressurized air flow flowing in a downstream intake pipe of an intercooler disposed in the intake passage and an outflow due to a negative pressure air flow flowing in an upstream intake pipe of a compressor housing disposed in the intake passage. Thus, since the air flow in the motor housing is quickly replaced in one direction, the motor housing and the electric motor can be efficiently cooled, and in particular, a reduction in the driving force of the electric motor can be prevented.

  Further, in the electrically assisted turbocharger [Claim 5], by adopting the configuration according to Claim 8, the winding height on the compressor portion side of the armature winding wound around each stator tooth can be cleared. The stator teeth tip surface can be disposed at a position that surrounds the outer peripheral surface of the rotor portion with a certain gap so as to be opposed to each other. As a result, the length of the electrically assisted turbocharger in the turbine axial direction can be reduced. .

  It is sectional drawing of the axial direction of an electrically assisted turbocharger.   It is a partial cross section figure of the axial direction which shows other embodiment of an electrically assisted turbocharger.   It is a block diagram of an electrically assisted turbocharger, an intake passage, and an exhaust passage.   It is sectional drawing of the vertical direction of an air cleaner box.   It is sectional drawing of the vertical direction of another air cleaner box.   It is a block diagram of the embedded magnet type which has arrange | positioned the permanent magnet of N pole and S pole in the circular groove | channel provided in the rotor part.

DESCRIPTION OF SYMBOLS 1 Electric assist turbocharger 31 Spiral partition wall 2 Compressor part 32 Air inlet 3 Compressor impeller 33 Intercooler 4 Compressor impeller disk part 34 33 Downstream side intake pipe 5 Hub part 35 First air outlet 6 Vane 36, 44 Inlet pipe 7 Intake passage 37 Second air outlet 8 Compressor housing 38 Upstream intake pipe of 8 9 Permanent magnet base 39 Air outlet 10 Annular yoke 40 Release pipe 11 N pole permanent magnet 41 Air cleaner element 12 S pole permanent Magnets 42, 45 Air cleaner box 13 Rotor portion 43 Air outlet 14 Stator teeth 46 Partition wall 15 Stator 52 Groove 16 Motor housing 60 Armature winding 17 First partition plate 18 Electric motor 19 Turbine shaft 20 Bearing housing 21 Turbine Impeller 22 Exhaust passage 23 Turbine housing 24 Turbine portion 25 Hollow chamber 26 Central protrusion 29 Second partition plate 30 Heat transfer shielding chamber

  A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings. The whole electrically assisted turbocharger to which the present invention is applied will be described with reference to the configuration diagram.

  As shown in FIG. 1, the electrically assisted turbocharger 1 includes a plurality of vanes 6 continuously formed between the surface side of the disk portion 4 [the intake port side of the compressor portion] and the hub portion 5 in the compressor impeller 3 of the compressor portion 2. The compressor housing 8 disposed in the intake passage 7 surrounds the surface side of the disk portion 4 provided with the plurality of vanes 6.

  The compressor impeller 3 is provided with a cylindrical permanent magnet base 9 integrally formed on the back side (bearing housing part side) of the disk part 4, and a semicircular shape is formed on the surface of the permanent magnet base 9 via an annular yoke 10. The N-pole permanent magnets 11 and the S-pole permanent magnets 12 having the cross section are alternately arranged and fixed, and the outer peripheral surfaces of the N-pole permanent magnets 11 and the S-pole permanent magnets 12 constitute a cylindrical shape. A rotor portion 13 is formed. In one embodiment of the present invention, the permanent magnet base 9 is formed in a cylindrical shape having a rotation center on the same line as the rotation center of the compressor impeller 3.

  In the manufacturing process of integrally molding the compressor impeller 3 main body, the annular yoke 10 in the rotor portion 13 is inserted in advance into the mold, and the annular yoke 10 A method of integrally molding the permanent magnet base 9 and the compressor impeller 3 main body, a method of integrally molding the annular yoke 10 on the permanent magnet base 9 of the compressor impeller 3 main body, and the like are conceivable. Further, when the material of the compressor impeller 3 main body has a function of passing a magnetic line like the yoke 13, the annular yoke 10 can be omitted.

  A first partition that partitions the stator 15 between the compressor housing 8 and the motor housing 16 at a fixed position in which the outer peripheral surface of the rotor portion 13 and the tip surface 14a of the stator tooth 14 of the stator 15 surround with a certain gap. Further, the stator 15 is disposed on the plate 17, and the stator 15 is fixed to the first partition plate 17 with screws or the like (it may be disposed and fixed on the motor housing 16 or the bearing housing 20 described later).

  In the embodiment shown in FIG. 1, the stator 15 is arranged and fixed on the pedestal of the first partition plate 17, but the pedestal is not provided over the entire circumference. Rather, it is arranged and fixed in a state where it floats on a pedestal that is divided into several places so that an air flow flows between the pedestal and the stator 15 is cooled.

  The rotor portion 13 and the stator 15 constitute an electric motor 18 (hereinafter referred to as a motor 18). The motor 18 is housed in a hollow motor housing 16 partitioned from the compressor housing 8 by the first partition plate 17. Has been. [In addition, the stator 15 in the electric motor 18 is not limited to being fixed to the first partition plate 17, but may be fixed to the motor housing 16, the second partition plate 29 described later, or the like].

  A compressor housing 8 that surrounds the compressor impeller 3 via the first partition plate 17 and is disposed in the intake passage 7 is disposed and fixed to the motor housing 16 that is integrally formed with the bearing housing 20 that supports the turbine shaft 19. In addition, a turbine housing 23 that surrounds the turbine impeller 21 and is disposed in the exhaust passage 22 and into which exhaust gas is introduced is disposed and fixed to the other bearing housing 20, and the electric assist turbocharger 1 is configured. .

  The compressor impeller 3 and the turbine impeller 21 are respectively connected to both ends of the turbine shaft 19. The compressor impeller 3 is rotated by the rotational force of the turbine impeller 21 driven by exhaust gas energy, and the air sucked by the rotation is sucked. Pressurize and supercharge the combustion chamber.

  In order to reduce the weight of the main body of the compressor impeller 3, the broken line portion on the turbine shaft 19 side of the permanent magnet base 9 shown in FIG. If the hollowing is achieved, it is difficult to transmit the heat transfer from the turbine section 24 by the turbine shaft 19 to each of the N pole and S pole permanent magnets at the same time as reducing the weight, thereby preventing irreversible demagnetization of the permanent magnets due to the heat transfer. it can. Note that if a communication path is provided between the hollowed portion and the motor housing 16, the temperature of the heat transferred to the hollowed portion is not reduced, and it is difficult to transfer the heat transfer to each permanent magnet.

  Further, when the electrically assisted turbocharger 1 is increased in size in order to cope with an engine having a large displacement, the diameter of the rotor portion 13 is increased, and at the same time, the diameter of the permanent magnet base 9 is increased. Accordingly, it is possible to make the one-dot chain line portion of the permanent magnet base 9 shown in FIG. 1 on the turbine shaft 19 side hollow, and in the embodiment shown in FIG. 2, the same radius on the back side of the disk portion 4a in the compressor impeller 3a. A hollow chamber 25 formed in a hollow and cylindrical shape with an opening on the bearing housing 20a side is provided inside the permanent magnet base 9a integrally formed above, and a central protrusion 26a on the compressor portion side in the bearing housing 20a that supports the turbine shaft 19a. Is positioned in close proximity to the hollow chamber 25. With the above configuration, the axial direction of the electrically assisted turbocharger can be shortened.

  As shown in FIG. 2, when the rotor portion 13a is overhanged on the back side of the disk portion 4a (bearing housing side), and the central projection 26a of the bearing housing 20a is positioned so as to enter the hollow chamber 25, the radial direction Can be brought closer to the bearing portion side of the bearing housing 20a that supports the turbine shaft, and the radial load can be suppressed to maintain high-speed rotation.

  Then, the bearing housing 20 in the electric assist turbocharger 1, the central protrusion 26 on the compressor portion side of the bearing housing 20, the bearing housing 20a in the electric assist turbocharger that is enlarged, and the compressor portion side in the bearing housing 20a. The central projection 26a has a component that supports the turbine shafts 19 and 19a inside, and receives a load of oil in a floating metal against each load in the radial direction and the thrust direction of the turbine shaft, or a ball bearing. Depending on whether it is received or not, the structure and the composition to be combined also differ.

  For example, there are oil film dampers and ball bearings that support the turbine shaft with ball bearings, and there are thrust bearings, thrust collars / thrust bushings, and floating metals that support the turbine shaft with floating metal. There is. The electric assist turbocharger according to the present invention can be either a floating metal type or a ball bearing type. Therefore, in the drawing (illustrated) of the electric assist turbocharger according to the present invention, including the bearing portion, Items other than those directly related to the configuration of the assist turbocharger are omitted or simplified.

  Since the permanent magnet bases 9 and 9a are integrally formed with the compressor impellers 3 and 3a, the permanent magnet stands 9 and 9a are cooled by the air flow sucked by the rotation of the compressor impellers 3 and 3a. Therefore, the N-pole permanent magnets 11 and 11a and the S-pole permanent magnets 12 and 12a that are arranged and fixed in a cylindrical shape on the permanent magnet bases 9 and 9a via the annular yokes 10 and 10a also indirectly from the inside. Since it is cooled, irreversible demagnetization of the permanent magnet due to heat generated by driving the motor can be prevented.

  The first partition plate 17 that partitions the compressor housing 8 and the motor housing 16 shown in FIG. 1 is provided with an opening 27 that opens at the center of the first partition plate 17, and the opening 27 and the disk portion of the rotor portion 13. 4 Between the outer peripheral surfaces on the back side, a gap is set to a minimum in order to prevent air flow as much as possible. Further, for the purpose of further reducing the gap, the outer peripheral surface of the opening 27 at the center of the first partition plate 17 or the rotor part 13 on the back side of the disk part 4 is coated with resin, or the main body of the compressor impeller 3 or the first partition. A method is also conceivable in which the plate 17 and the opening 27 at the center of the first partition plate are replaced with resin parts so that an abradable function is provided between them.

  A motor 18 is accommodated in the hollow motor housing 16 partitioned from the compressor housing 8 by the first partition plate 17. Further, the motor housing 16 is connected to the motor housing 16 by a second partition plate 29 provided on the side of the bearing housing 20 in the motor housing 16 so as to open a communication port 28 that surrounds the periphery of the central protrusion 26 of one of the bearing housings 20. A partitioned heat transfer shielding chamber 30 is provided. The second partition plate 29 is fixed to the bearing housing 20 side by screws or the like (may be fitted to the bearing housing 20 side of the motor housing 16).

  In addition, a spiral partition wall 31 is provided in the heat transfer shielding chamber 30 so that the air flow that flows in through the communication port 28 can cool the heat transfer shielding chamber 30 uniformly. It is provided on the side wall surface of the bearing housing 20 of the second partition plate 29 (may be provided on the wall surface on the bearing housing 20 side). In addition, it is not limited to a spiral shape, You may provide the partition wall of another shape. Furthermore, the second partition plate 29 may be made of a material having excellent heat insulation properties or a material having high heat dissipation properties.

  Next, in this invention, the structure which prevents the heat damage to the motor 18 comprised with the rotor part 13 and the stator 15 as much as possible is employ | adopted. This will be described below.

  As shown in FIG. 3, a first air outlet 35 that opens into the intake pipe is provided in the intake pipe 34 on the downstream side of the intercooler 33 disposed in the intake passage 7, and air introduction that opens into the motor housing is provided in the motor housing 16. An inlet 32 is provided, and the first air outlet 35 and the air inlet 32 are communicated with each other through an inlet pipe 36. The heat transfer shield chamber 30 partitioned from the motor housing 16 by the second partition plate 29 is provided with a second air outlet 37 that opens into the heat transfer shield chamber, and is upstream of the compressor housing 8 disposed in the intake passage 7. An air discharge port 39 that opens into the intake pipe is provided in the side intake pipe 38, and the second air outlet 37 and the air discharge port 39 are connected by a discharge pipe 40.

  Further, in the inner peripheral surface 16 a of the motor housing 16 and the outer peripheral surface 15 a of the stator 15 shown in FIG. 1, the air flow flowing in from the air introduction port 32 is the inner peripheral surface 16 a of the motor housing 16 and the outer peripheral surface of the stator 15. The inner circumferential surface 16a of the motor housing 16 is formed in a circular shape so that the space between the 15a can be smoothly circulated, and the outer circumferential surface 15a of the stator 15 is like a gear to enhance the cooling effect. The outer periphery formed by the convex portion is formed in a circular shape (however, the inner peripheral surface 16a of the motor housing 16 is not particularly limited to a circular shape, and The shape of the outer peripheral surface of the stator is not particularly limited to an uneven shape or a circular shape.

  The air inlet 32 also opens to the inner peripheral surface 16a so as to flow from the tangential direction so that the air flow flowing into the motor housing 16 flows along the inner peripheral surface 16a of the motor housing 16. [Inflow from the back side of the air inlet 32 of FIG. 1]. The airflow then flows toward the communication port 28 in the center of the second partition plate 29 while cooling the motor housing 16 and the motor 18.

  Further, the air flow that has passed through the communication port 28 flows into the heat transfer shielding chamber 30 and flows along the spiral partition wall 31, but is the same as the air flow that flows into the motor housing 16 from the air introduction port 32. The air flow direction of the spiral partition wall 31 in the heat transfer shielding chamber 30 is set so as to flow out of the heat transfer shielding chamber 30 in the direction [outflow from the second air outlet 37 in FIG. Do].

  As shown in FIG. 3, the air flow discharged into the intake pipe 38 from the air discharge port 39 opened into the upstream intake pipe 38 of the compressor housing 8 passes through the intercooler 33 from the compressor housing 8. A part of the air flow from the first air outlet 35 opened in the intake pipe 34 on the downstream side of the intercooler 33 flows again into the motor housing 16 through the introduction pipe 36.

  In the embodiment shown in FIG. 3, the motor housing 16 and the motor 18 are cooled by the air flow introduced from the first air outlet 35 opened in the downstream intake pipe 34 of the intercooler 33. However, the present invention is not limited to this. As shown in FIGS. 4 and 5, the motor housing 16 and the motor 18 are cooled by the air flow guided from the air outlets 43 and 50 opened in the air cleaner boxes 42 and 45 on the downstream side of the air cleaner element 41. Another embodiment is also conceivable.

  In the embodiment shown in FIG. 5, the air cleaner box 45 on the downstream side of the air cleaner element 41 is provided with a main chamber 47 and a sub chamber 48 in which the air cleaner box 45 is divided into two by a partition wall 46, and the main chamber 47 is provided with a main chamber air outlet 49 that opens into the main chamber 47, the main chamber air outlet 49 communicates with the upstream side intake pipe 38 of the compressor housing, and the sub chamber 48 opens into the sub chamber 48. Another embodiment in which a sub chamber air outlet 50 is provided and the sub chamber air outlet 50 and the air inlet 32 provided in the motor housing 16 are communicated with each other through an introduction pipe 51 is also conceivable.

  Further, a cool air outlet opening in the evaporator storage box is provided downstream of the evaporator in the evaporator storage box of the air conditioner for cooling the passenger compartment, and the cool air outlet and the motor housing open in the motor housing. Another embodiment in which the motor housing and the motor are cooled by connecting the first air inlet with the introduction pipe and introducing cool air of an air conditioner for cooling the vehicle interior into the motor housing is also conceivable.

  In the compressor impeller 3 described above, the N-pole permanent magnet 11 and the S-pole permanent magnet 12 of the rotor portion 13 are surface magnet types [IPMSM] in which the N-pole and S-pole permanent magnets are arranged outside the rotor portion 13. As shown in FIG. 6, there is an embedded magnet type [SPMSM] in which N-pole and S-pole permanent magnets are arranged in a circular groove 52 provided in the rotor portion, and the adoption of the surface magnet type [IPMSM] A method in which N-pole permanent magnets 11 and S-pole permanent magnets 12 having a semicircular cross-section are alternately arranged on a permanent magnet base 9 via an annular yoke 10 and fixed with an adhesive or the like; If the method of covering the surface of the rotor portion 13 in which the N-pole permanent magnets 11 and the S-pole permanent magnets 12 are alternately arranged and fixed in a cylindrical shape is covered with a reinforced plastic fiber cover, a stainless steel cover, or the like, And the permanent of the S pole It is possible to deal with the damage or peeling of the stone.

  A ring-shaped magnet is also conceivable. The ring-shaped magnet has high mechanical strength, and can cope with breakage or peeling when the rotation speed and peripheral speed are high.

  Furthermore, as shown in FIG. 6, in the case of adopting the embedded magnet type [SPMSM], the permanent magnet base 9b is provided with a circular groove 52 in a direction parallel to the turbine shaft rotation center with a certain distance from the turbine shaft rotation center, In the groove 52, the annular yoke 10b is arranged on the inner side, and the N-pole permanent magnet 11b and the S-pole permanent magnet 12b are alternately arranged on the outer side, so that the annular yoke 10b and the N-pole permanent magnet 11b are arranged. And the permanent magnet 12b of S pole is integrated by various fixing methods, such as fitting and an adhesive agent.

  The number of poles and the number of slots are selected as appropriate in consideration of the use of the electric assist turbocharger. There is also an example in which a motor with a combination method in which the winding of the armature winding in the stator teeth is concentrated winding is selected for the electric assist turbocharger by selecting the 2-pole 6-slot, the number of poles and the number of slots, distributed winding, The concentrated winding is selected as appropriate in consideration of the use of the electric assist turbocharger.

  Although not shown, for detecting the magnetic pole position such as a lead wire connected to the end of each phase armature winding of the stator teeth, the hall element for detecting the magnetic pole position of the permanent magnet, and the like. A sensor lead wire or the like when using a sensor penetrates the motor housing 16 and is drawn out of the motor housing 16. A portion that penetrates the motor housing 16 is shielded by an elastic body such as rubber so as to prevent the inside and outside of the motor housing 16 from being ventilated.

  Various methods for controlling the motor have been devised, and a motor control method for detecting the magnetic pole positions of the N-pole and S-pole permanent magnets by using a magnetic pole position detection sensor such as a Hall element, and the position sensor are omitted. Thus, a motor control method based on an algorithm for estimating the position and speed of a motor from voltage and current information has been devised. Therefore, regarding the motor control method, an optimal control method is appropriately selected and determined from among various devised control methods.

  Control devices such as inverters that control motors are used for turbine impellers when the engine is running at low speed, such as inertia of a rotating body including a turbine impeller and a compressor impeller, a low exhaust gas amount from the engine, or a low exhaust gas temperature. Increase the torque in the low-speed rotation range, such as when the exhaust gas energy enough to rotate the engine cannot be obtained and sufficient supercharging is not possible, the engine is sufficiently supercharged to eliminate the turbo lag and make it easier to start on the slope. Therefore, the motor is controlled so as to actively rotate the compressor impeller. The motor basically rotates as soon as the engine is started, and stops rotating as soon as the engine is stopped.

  In order to increase the torque in the low-speed rotation range, such as the elimination of the turbo lag and the start of the slope, the control device starts the accelerator opening that can judge the situation, and in the intake pipe of the engine It may be incorporated as a program in an ECU (Electronic Control Unit) that recognizes all engine parameters such as the amount of negative pressure, engine speed, vehicle speed, atmospheric pressure, and the like, and the motor may be controlled based on the status signals.

  Furthermore, when the engine speed increases and the amount of exhaust gas energy increases, the torque and output set by the amount of exhaust gas energy can obtain a boost pressure exceeding the target value. The power transmission to the motor is stopped, and the function as the motor is suspended. Further, even when the rotational speed set for the motor is reached, power transmission to the motor is stopped and the motor is stopped. For the above reasons, when the rotational speed exceeds the set value for the motor, regenerative power can be obtained using the motor as a generator.

  In the embodiment of the present invention described above, the motor 18 is accommodated in the motor housing 16. Therefore, when the motor is driven, self-heating of the stator 15 and heat transfer from the turbine section 24 occur. However, in the embodiment of the present invention, as described above, the heat damage to the motor 18 is minimized. Adopted a preventive configuration. Next, the operation will be described.

  In the embodiment of the present invention, as shown in FIG. 3, the pressure difference between the air flow flowing in the downstream intake pipe 34 of the intercooler 33 and the air flow flowing in the upstream intake pipe 38 of the compressor housing 8 is used. Then, an air flow flowing in the intake pipe 34 on the downstream side of the intercooler 33 is introduced into the motor housing 16, and the motor 18 housed in the motor housing 16 and the motor housing 16 is cooled by the introduced air flow. Yes.

  First, a part of the pressurized air flow flowing in the downstream side intake pipe 34 of the intercooler 33 flows out into the introduction pipe 36 from the first air outlet 35 opened in the downstream side intake pipe 34, and The air flows into the motor housing 16 through the air inlet 32 that opens into the motor housing 16 through the introduction pipe 36. Then, the air flow that flows into the motor housing 16 and the motor 18 [specifically, mainly the u-phase, the v-phase, and the w-phase of the stator and stator teeth whose outer peripheral surface shape is formed in an uneven shape like a gear. Each phase armature winding and the rotor portion 13] are cooled, and then flow into the heat transfer shielding chamber 30 through the communication port 28 communicating between the motor housing 16 and the heat transfer shielding chamber 30. Then, it flows along the spiral partition wall 31 (shown in FIG. 1) provided in the heat transfer shielding chamber 30, and cools the wall surface in the heat transfer shielding chamber 30 from the turbine section 24. Acts to cut heat transfer.

  An air discharge port 39 that opens from the second air outlet 37 that opens into the heat transfer shielding chamber 30 to the upstream intake pipe 38 of the compressor housing 8 through the discharge pipe 40 that communicates with the second air outlet 37. The air is discharged into the upstream intake pipe 38 and mixed with the negative pressure air flow sucked by the compressor unit 2.

  In another embodiment shown in FIG. 4, the air introduction port 32 opened in the motor housing 16 and the air outlet 43 opened in the air cleaner box 42 on the downstream side of the air cleaner element 41 are communicated by the introduction pipe 44. Therefore, part of the air in the air cleaner box 42 on the downstream side of the air cleaner element 41 flows into the motor housing 16 through the introduction pipe 44 from the air outlet 43 due to the suction force of the compressor unit 2, It acts to cool the motor 18. Thereafter, the air flow passes through the communication port 28 opened in the second partition plate 29 and flows along the spiral partition wall 31 provided in the heat transfer shielding chamber 30, and passes through the wall surface in the heat transfer shielding chamber 30. By cooling uniformly, it acts to cut the heat transfer from the turbine section 24.

  In another embodiment shown in FIG. 5, the air cleaner box 45 on the downstream side of the air cleaner element 41 is divided into a main chamber 47 and a sub chamber 48 by a partition wall 46, and the main chamber 47 is divided into the main chamber 47. The main chamber air outlet 49 that opens into 47 and the upstream intake pipe 38 of the compressor housing 8 communicate with each other, and the sub chamber 48 opens into the sub chamber 48 and the sub chamber air outlet 50 opens into the motor housing 16. Since the introduction port 32 communicates with the introduction pipe 51, the air in the sub chamber 48 is sucked into the motor housing 16 by the suction force of the compressor unit 2, and the motor housing 16 and the motor 18 are cooled by the sucked air. Acts as follows. Since the interior of the air cleaner box 45 is divided into the main chamber 47 and the sub chamber 48 by the partition wall 46, air can be reliably sucked without being influenced by each other.

  In the air cleaner box 45 downstream of the air cleaner element 41, if the air cleaner element 41 is bellows type as shown in FIG. 5, the position of one or more folds of the air cleaner element 41 and the upper surface of the partition wall 46 overlap. A partition wall 46 may be provided, or a partition wall may be provided between the folds to divide the air cleaner element 41 and be divided into a main chamber 47 and a sub chamber 48.

  Furthermore, a cold air outlet opening in the evaporator storage box on the downstream side of the evaporator is provided downstream of the evaporator in the evaporator storage box of the air conditioner for cooling the passenger compartment, and the cold air outlet and the motor housing are opened in the motor housing. The first air inlet provided is communicated with the introduction pipe so that a part of the cold air of the air conditioner that cools the vehicle interior is introduced into the motor housing by the suction force of the compressor unit 2, thereby Acts to cool the motor.

  In the method described above, the refrigerant compressed by the compressor takes the heat from the condenser through the evaporator, cools the evaporator, and a part of the cold air generated by the blower fan wind from the rear of the evaporator is introduced into the motor housing. It is led inside to cool the motor housing and motor.

  This method is effective only when an air conditioner is used because the outside air temperature is high and the inside of the vehicle is cooled. However, a method of introducing an air flow into the motor housing from the intake pipe downstream of the intercooler described above, or an air cleaner element When the air flow from the downstream air cleaner box is introduced into the motor housing, when the motor cannot be cooled sufficiently, it is installed as a program in an ECU (Electronic Control Unit) that recognizes all engine parameters, and based on their status signals When the outside air temperature is high, especially when it is necessary to further cool the motor, the ECU performs automatic selection, and when there is no need to further cool the motor housing and the motor, the intercooler downstream In the intake pipe and air cleaner The method of guiding the air flow from the air cleaner box downstream of the ment to the motor housing may be switched automatically by the ECU.

  The subsequent air flow in each embodiment described above is mixed with the negative pressure air flow sucked by the compressor unit 2. Air circulates through the above-described path, and the motor and the motor housing continue to be cooled while the engine is rotating.

  Also, in the bearing housing 20 that supports the turbine shaft, the turbine housing 23 of the turbine section 24 is fixed to and integrated with the turbine housing 23 side for the purpose of cutting heat transfer from the turbine section 24. An air cooling chamber in a hollow state is provided, and an air inlet provided in the air cooling chamber and a second air outlet 37 opened in the heat transfer shielding chamber 30 are communicated, and the air outlet provided in the air cooling chamber and the upstream intake air of the compressor housing 8 Another embodiment in which an air discharge port 39 opened in the pipe 38 is communicated is also conceivable.

  In addition, the motor housing 16 is not provided with the heat transfer shielding chamber 30, and the motor housing is provided with an air inlet opening in the motor housing, and the motor housing on the opposite side of the air inlet with the turbine shaft interposed therebetween. An air outlet that is opened in the interior of the motor housing and the air flow that flows into the motor housing is stored in the motor housing and the motor housing (specifically, the outer peripheral surface is mainly formed into an uneven shape like a gear. The stator and stator teeth u-phase, v-phase, and w-phase armature windings and rotor portions] are cooled and then discharged from the air outlet into the intake pipe upstream of the compressor housing. Conceivable.

  The sizes of the inlet and outlet pipes communicating with the air outlets and inlets that open to the intercooler 33, the motor housing 16, and the heat transfer shielding chamber 30, and the interiors of the motor housing 16 and the heat transfer shielding chamber 30. The volume and the like are appropriately selected and determined according to the use and size of the electric assist turbocharger 1 so that the motor housing 16 and the motor 18 accommodated in the motor housing 16 can be cooled most efficiently.

  In the embodiment of the present invention, the rotor portion 13 is positioned close to the back side of the disk portion 4 of the compressor impeller 3 in order to reduce the length of the electric assist turbocharger 1 in the direction of the turbine shaft 19 as much as possible. It is arranged. Therefore, in order to correspond the stator teeth front end surface 14a to the rotor portion 13 brought close to the back side of the disk portion 4, as shown in FIG. 2, the rotor portion 13a side in the armature winding 60 of the stator teeth 14 of the stator is provided. The first fold position AA, and the stator teeth first fold position A-A is bent toward the back of the disk portion 4a of the compressor impeller 3a integrally formed with the rotor portion 13a, and the first fold position The front end of the stator teeth 14 on the front rotor portion 13a side is formed as a second fold position B-B, and the second fold position B-B is bent so as to form a plane parallel to the stator core back surface and the stator teeth 14 surface. ing.

  Therefore, the winding height H on the compressor impeller 3 side of the armature winding 60 wound around each stator tooth 14 can be cleared, and the stator teeth tip surface 14a has a certain gap with the outer peripheral surface of the rotor portion 13a. Can be placed at positions that surround each other. Further, although the turbine shaft direction in the rotor portion becomes long, it is sufficiently conceivable to employ a stator in which the stator teeth and the stator core back are formed on the same plane.

  Further, in another electrically assisted turbocharger, when the rotor portion constituting the motor is arranged and fixed to the turbine shaft, in order to bring the rotor portion as close as possible to the bearing housing side, the winding method of the stator teeth is a compressor. There is also an example in which the winding width on the bearing housing side is concentrated in a narrow range at a position away from the turbine shaft as compared with the winding width on the impeller side.

  Therefore, the end of the stator teeth in the armature winding on the rotor portion side is set as the first fold position, the stator teeth first fold position ahead is bent toward the bearing housing side, and the first fold position ahead of the rotor portion side Another embodiment is also conceivable in which the front end of the stator teeth is set as the second fold position and the second fold position ahead is bent so as to be parallel to the stator core back surface and the stator teeth surface.

  When the above-described embodiment is adopted, the stator teeth front end face is disposed at a position facing the rotor portion even if the winding width of the armature winding is evenly wound around the stator teeth as in the past. Can do.

  The stator is configured by laminating a plurality of silicon steel plates, but each silicon steel plate is overlapped and laminated after processing, and the stator teeth front end surface has a constant gap with the rotor surface. When punching into a set shape of each silicon steel sheet so as to face each other, and at the time of processing to fold the first fold position and the second fold position at the same time or separately, particularly, The thickness between the first crease position and the second crease position of the stator core is made thinner than the stator core back and the thickness of the stator teeth from the stator core back to the first crease position, and the first crease position and When the top of each mountain fold side and the bottom of each valley fold side of the second crease position are processed in a proximity state in which a plurality of silicon steel plates overlap each other so that they are not in slight contact with each other. There.

  In one embodiment of the present invention, the top shape of each mountain fold side on the front and back of a single silicon steel sheet is formed into a curved shape, and the bottom shape of each valley fold side is defined as the stator teeth plane and the first shape of the stator teeth. The first fold position and the plane between the second fold positions are formed in a shape that intersects with a straight line, and further, the stator between the first fold position and the second fold position of the stator teeth and the second fold position ahead of the stator teeth. The teeth plane is formed in a shape that intersects with a straight line, and the thickness between the first crease position and the second crease position of the stator teeth in one silicon steel sheet is such that the front and back of the plurality of silicon steel sheets are in close contact with each other It is laminated and pressed to a thickness that constitutes the stator.

  Therefore, the top of each mountain fold side and the bottom of each valley fold side of the stator teeth are not in direct contact when stacked, and are positioned on the front and back planes between the first fold position and the second fold position of the stator teeth. The stator is configured.

  The turbine shaft 19 that connects the turbine impeller 21 and the compressor impeller 3 is housed in the bearing housing 20 and is supported by a bearing portion provided in the bearing housing 20 and is lubricated by lubricating oil. Lubricating oil for lubricating the turbine shaft 19 is supplied to the turbine shaft 19 from a lubricating oil inlet provided at the upper part of the bearing housing 20, and after lubricating the turbine shaft 19, is discharged from a lubricating oil discharge port provided at the lower part of the bearing housing 20. Then, it is recovered and used again as lubricating oil for lubricating the engine, the turbine shaft 19 and the like (the lubricating oil inlet and the lubricating oil outlet are not shown).

  As described above, the embodiments of the present invention have been described with reference to the accompanying drawings. By increasing the rotational force of the compressor impeller with the driving force of the permanent magnet synchronous motor, high torque can be obtained in a low engine speed range. Therefore, it is possible to review the shape of vanes in compressor and turbine impellers that have been developed in the past, and by revisiting them together with the driving force of the motor, the engine impeller can be further improved from low to medium high speed ranges. It is possible to provide an electrically assisted turbocharger that achieves high torque and high output.

  The embodiment shown here is not limited and can be variously modified. For example, in the electrically assisted turbocharger according to the embodiment of the present invention, the motor housing is configured integrally with the bearing housing. However, various division positions between the compressor housing, the first partition plate, the motor housing, the bearing housing, and the turbine housing are conceivable.

  The present invention is not limited to such embodiments, and it is obvious that those skilled in the art can conceive various changes or modifications within the scope of the claims. As a matter of course, it is understood that it belongs to the technical scope of the present invention.

  This electrically assisted turbocharger is a gasoline engine, diesel engine that is used as a power source for vehicles that carry people and things such as passenger cars, buses, trucks, dump trucks, and construction machines such as wheel loaders and excavators. It can be used as a supercharger for increasing the output of engines, rotary engines, etc., improving fuel efficiency, and reducing harmful gas emissions.

Claims (5)

  It is equipped with a plurality of vanes continuously formed between the disk part surface side of the compressor impeller and the hub part, and the compressor housing surrounds the disk part surface side provided with the plurality of vanes, and is integrated with the disk part back side of the compressor impeller. And a rotor portion in which N-pole and S-pole permanent magnets are alternately arranged on the outer peripheral surface of the annular yoke and arranged in a cylindrical shape via an annular yoke. The stator is arranged and fixed on the first partition plate at a fixed position surrounding the outer peripheral surface of the portion and the tip end surface of the stator tooth with a certain gap, and the electric motor constituted by the rotor portion and the stator is compressed by the first partition plate. The motor is housed in a motor housing that is partitioned from the housing, and is integrated with the bearing housing that supports the turbine shaft. The compressor housing, which surrounds the compressor impeller via the first partition plate and is arranged in the intake passage, is arranged and fixed in an integral manner, and the other side of the bearing housing surrounds the turbine impeller and is arranged in the exhaust passage. An electrically assisted turbocharger characterized in that a turbine housing into which is introduced is fixed and integrated.   A compressor part in a bearing housing that supports a turbine shaft by providing a hollow cylindrical chamber that is open on the bearing housing side inside the permanent magnet base that is integrally configured on the same radius on the back side of the disk part of the compressor impeller. The electrically assisted turbocharger according to claim 1, wherein the central projection on the side is located in close proximity to the hollow chamber.   On the side of the bearing housing in the motor housing, a heat transfer shielding chamber is provided that is partitioned from the motor housing by a second partition plate that is provided by opening a communication port that surrounds and surrounds the periphery of the central protrusion of one of the bearing housings. The electrically assisted turbocharger according to claim 1.   A first air outlet that opens into the intake pipe is provided in the intake pipe on the downstream side of the intercooler disposed in the intake passage, and an air inlet that opens into the motor housing is provided in the motor housing. An air discharge port that opens into the intake pipe at the upstream intake pipe of the compressor housing that is disposed in the intake passage, and is provided with a second air outlet that opens into the heat transfer shield chamber. The electrically assisted turbocharger according to claim 3, wherein the second air outlet and the air discharge port are communicated with each other by a discharge pipe.   A stator having an armature winding laminated with a plurality of silicon steel plates has a rotor portion integrated with the stator teeth first fold position ahead of the stator teeth armature winding with the end on the rotor portion side as the first fold position. The compressor impeller is configured to bend toward the rear surface of the disk portion, and further, the front end of the stator teeth on the rotor portion side ahead of the first fold position is the second fold position, and the second fold position ahead is the stator core back surface and the stator teeth surface. 2. The electrically assisted turbocharger according to claim 1, wherein the electrically assisted turbocharger is formed by being bent so as to form a parallel surface.

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