MAIN ELECTRIC MOTOR

Abstract

Main electric motor of the vehicle (1) comprising the following: an electric motor to power a vehicle; a blower (6) which is attached to a rotating shaft (5) of the electric motor, for rotation with rotation of the rotating shaft (5); a housing (10) containing the electric motor and the blower (6) inside, between two end sections in a direction parallel to the rotating shaft (5) of a surface of the housing (10) that faces the vehicle body of the vehicle, which has (i) an air outlet channel (14) formed at one end section facing the blower (6) for releasing air from the interior, and (ii) an air inlet channel (15) formed at the other end section of the two end sections for drawing air into the interior; and an air inlet duct cover (15) having an opening part (21) for letting in air in a direction perpendicular to a direction of movement of the vehicle and forming an airflow passage (22) from the opening part (21) to the air inlet duct (15), wherein the air inlet duct cover (15) has the following features: (i) a guide plate (24) for guiding air flowing in from the opening part (21) into the section in the outer circumferential surface (23) of the air inlet duct cover (20) facing the vehicle body parallel to the direction of movement in the interior of the airflow passage (22) by blocking the space between the opening part (21) and the air inlet duct (15) in order to leave an airflow path between the guide plate (24) and a section of the air inlet duct cover (20) facing the vehicle body in the outer circumferential surface (23), (ii) an outlet channel (25) formed in the outer circumferential surface (23) to discharge foreign bodies contained in the air flowing in through the opening part (21) and guided by the guide plate (24), (iii) an outlet duct cover (26) that covers the outlet duct (25), separates the outlet duct (25) and the air inlet duct (15) from each other and leaves an airflow path from the opening part (21) to the outlet duct (25), and (iv) a pair of cylindrical elements (27) the ends of which are connected to two holes formed in the air outlet duct cover (26) and the other ends of which point towards each other in the direction of travel, the cross-sectional area of ​​the cylindrical elements (27) tapering from one end to the other end.

Description

Technical field

[0001] The present disclosure relates to a vehicle main electric motor that separates foreign particles from air taken in from the outside for cooling purposes. State of the art

[0002] A main electric motor for powering an electric rail vehicle is installed in a confined space within a bogie. An open main electric motor is used to provide the necessary energy density for propelling the vehicle. This motor draws in cooling air from the outside, which cools the stator and rotor conductors that generate heat. The open main electric motor employs a self-venting system, whereby cooling air is drawn into the motor's interior by a cooling fan attached to the rotor, which rotates with the rotor's rotation.

[0003] The housing of the open main electric motor, which employs a self-venting system, incorporates an air inlet duct for drawing cooling air into the housing and an air outlet duct for expelling the cooling air from the interior. An air inlet cover, equipped with a filter, is attached to the air inlet duct to prevent the ingress of foreign matter, such as dust, rain, snow, or similar contaminants, into the main electric motor. Efficient intake of cooling air into the housing is necessary to cool the rotor and stator. This air is drawn into the main electric motor housing by the rotation of a cooling fan and then expelled through the air outlet duct after heat exchange with the rotor and stator.Due to the attachment of the air intake cover equipped with the filter to the air intake duct, regular cleaning of the filter is necessary for efficient intake of cooling air into the interior of the housing over a longer period of time.

[0004] A rotating electric motor of a vehicle, disclosed in JP S63-28244A, is equipped with a ventilation filter that separates dust from the air using centrifugal force and inertia. In this rotating electric motor of a vehicle, dust-containing contaminated air, separated by the ventilation filter, flows through a contaminated air bypass and is directed to a dust collection chamber equipped with a lid that is normally closed, and the dust accumulates in the dust collection chamber.

[0005] Publication JP 2000 - 152 561 A shows a ventilation filter with an outside air inlet that opens almost vertically downwards and a pivoting wind tunnel of nearly circular arc design, extending from the inlet over at least half a circumference. The inner peripheral end section of the wind tunnel is connected to a cooling air inlet of a dynamo-electric machine frame. The outer peripheral end section of the wind tunnel is connected to a bypass air inlet of the dynamo-electric machine frame.

[0006] Publication JP 2002-272061A depicts a vehicle's main engine that draws in outside air through a cyclone air filtration system. The system incorporates a fan mounted inside the main engine, which is mounted on a vehicle wheel. The fan directs the air through a rotor and stator for cooling and exhausts it through an outlet. The cyclone air filtration system comprises an intake cylinder, a dust collection path for removing the dust and moisture collected in the cylinder, and a discharge path for drawing the cleaned outside air, now free of dust and moisture, into the main engine.

[0007] The publication JP S50-145974A shows a cyclone filter designed such that the cooling air, fed into the L-shaped structure from a cooling air inlet, is swirled between an outer and an inner cylinder to separate dust, rain, and snow by centrifugal force. The separated dust particles or similar are deposited in a section, and the cleaned air is directed into the machine through the interior of the clean air inner cylinder. The dust or similar particles separated by centrifugal force are collected in the upper part of the outer cylinder, swirled, and deposited in the section.Over time, the upper part of the outer cylinder opens due to the rotation of the dust or the like, and another cylinder is provided on the outside, so that the triple cylinder with the dust collection chamber achieves a constant effect. Brief description of the invention: Technical problem

[0008] For the rotating electric machine of a vehicle disclosed in JP S63-28244A, the provision of a filter is not required, thus improving ease of maintenance. However, due to the rotation of the cooling fan, there is a negative pressure inside the electric motor of the rotating electric machine of the vehicle disclosed in JP S63-28244A, and therefore there is a possibility that the dust accumulated in the dust collection chamber may flow back through the bypass and into the interior of the electric motor.

[0009] Taking into account the aforementioned circumstances, one objective of the present disclosure is to prevent the backflow of foreign bodies separated from the air into the interior of the vehicle's main electric motor. Solution to the problem

[0010] To solve the aforementioned problem, the main vehicle electric motor of the present disclosure comprises the following: an electric motor for driving a vehicle, a blower, a housing in which the electric motor and the blower are accommodated, and an air inlet duct cover. The blower is attached to a rotating shaft of the electric motor and rotates with the rotation of the rotating shaft. The housing contains the electric motor and the blower and, between two end sections, has an air outlet duct formed at one end section facing the blower for expelling air from the interior and an air inlet duct formed at the other end section of the two end sections for drawing air into the interior.The air intake duct cover has an opening for admitting air in a direction perpendicular to the vehicle's direction of travel and forms an airflow passage from the opening to the air intake duct; and the air intake duct cover has a guide plate, the air outlet duct, and the air outlet duct cover. The guide plate directs air flowing from the opening into the section of the air intake duct cover facing the vehicle body, parallel to the direction of travel within the airflow passage, by blocking the space between the opening and the air intake duct, thus maintaining an airflow path between the guide plate and a section of the air intake duct cover facing the vehicle body in the outer circumferential surface.The outlet channel is formed in the outer circumferential surface to expel foreign particles contained in the air flowing in through the opening and guided by the guide plate. The air outlet channel cover conceals the outlet channel, separating it from the air inlet channel and maintaining an airflow path from the opening to the outlet channel. For the pair of cylindrical elements, one end of which is connected to two holes formed in the air outlet channel cover and the other end of which points towards each other in the direction of travel, the cross-sectional area of ​​the cylindrical elements tapers from one end to the other. Advantageous effects of the invention

[0011] According to the present disclosure, the backflow of foreign bodies separated from the air and the ingress of foreign bodies into the vehicle's main electric motor can be prevented by providing the following: an air outlet duct cover that covers the outlet duct, separates the air inlet duct and the outlet duct from each other, and maintains the airflow path from the opening part to the outlet duct, and a pair of cylindrical elements, one end of which is connected to two holes formed in the air outlet duct cover and the other ends of which point towards each other in the direction of travel of the vehicle, wherein the cross-sectional area of ​​the cylindrical elements tapers from one end to the other end. Brief description of the drawings Fig. Figure 1 is a cross-sectional drawing of a vehicle main electric motor according to embodiment 1 of the present disclosure; Fig. Figure 2 is a drawing showing an example of a vehicle to which the vehicle's main electric motor is attached according to embodiment 1; Fig. Figure 3 is a top view of the vehicle's main electric motor according to embodiment 1; Fig. Figure 4 is a perspective view of the vehicle's main electric motor according to embodiment 1; Fig. Figure 5 is a perspective view of an air inlet duct cover according to embodiment 1; Fig. Figure 6 is a cross-sectional drawing of the air inlet duct cover according to embodiment 1; Fig. Figure 7 is a drawing showing air and foreign body flows occurring in the vehicle's main electric motor according to embodiment 1; Fig. Figure 8 is a drawing showing air and foreign body flows occurring in the air inlet duct cover according to embodiment 1; Fig. Figure 9 is a cross-sectional drawing of a vehicle main electric motor according to embodiment 2 of the present disclosure; Fig. Figure 10 is a perspective view of an air inlet duct cover and an outlet element according to embodiment 2; Fig. 11 is a side view of the air inlet duct cover and the outlet element according to embodiment 2; Fig. Figure 12 is a drawing showing air and foreign body flows occurring in the air inlet duct cover and the outlet element according to embodiment 2; Fig. Figure 13 is a drawing showing air and foreign body flows occurring in the outlet element according to embodiment 2; Fig. Figure 14 is a cross-sectional drawing of the vehicle's main electric motor according to embodiment 3 of the present disclosure; Fig. Figure 15 is a perspective view of an air inlet duct cover and an outlet element according to embodiment 3; Fig. 16 is a perspective view of an air inlet duct cover and an outlet element according to embodiment 4 of the present disclosure; Fig. 17 is a side view of the air inlet duct cover and the outlet element according to embodiment 4; Fig. Figure 18 is a drawing showing air and foreign body flows occurring in the air inlet duct cover and the outlet element according to embodiment 4; Fig. Figure 19 is a cross-sectional drawing of a vehicle main electric motor according to embodiment 5 of the present disclosure; Fig. Figure 20 is a cross-sectional drawing of a vehicle main electric motor according to embodiment 6 of the present disclosure; and Fig. Figure 21 is a perspective view of an air inlet duct cover according to embodiment 6. Description of embodiments

[0012] The following sections describe embodiments of the present description in more detail with reference to the drawings. In the drawings, identical or equivalent components are assigned the same reference numeral. Design 1

[0013] Fig. Figure 1 is a cross-sectional drawing of a vehicle main electric motor according to embodiment 1 of the present disclosure. Fig. Figure 2 is a drawing showing an example of a vehicle to which the vehicle's main electric motor is attached according to embodiment 1. Fig. Figure 3 is a top view of the vehicle's main electric motor according to embodiment 1. Fig. Figure 3 is a cross-sectional drawing along line AA in Fig. 1. Fig. Figure 4 is a perspective view of the vehicle's main electric motor according to embodiment 1. A vehicle's main electric motor 1 (hereinafter referred to as the main electric motor) is attached to a vehicle, such as a rail vehicle. In the example shown in Fig. 1 to Fig. As shown in Figure 4, the vertical direction is the Z-axis, the direction of movement of the vehicle is the Y-axis, and the lateral direction of the vehicle is the X-axis, which, in the case of a rail vehicle, is the track sleeper axis. The vehicle moves in either the positive Y-axis direction or the negative Y-axis direction.

[0014] The following components are housed in a casing 10 of the main electric motor 1: a stator 3 having a winding 2; a rotor 4 facing the stator 3; a rotating shaft 5, arranged to pass through the center of the rotor 4 in the X-axis direction to transmit rotation of the rotor 4 to the exterior of the main electric motor 1; a fan 6, mounted on the rotating shaft 5 to rotate with the rotor 4; and a ball bearing 7 and a roller bearing 8 supporting the rotating shaft 5. An annular grease pocket 9, integrated on the axis of the rotating shaft 5, is located near both the ball bearing 7 and the roller bearing 8. The grease pocket 9 has an arbitrary shape. The housing 10 comprises the following: a frame 11 surrounding the periphery of the rotating shaft 5, a bearing support 12 rotatably supporting the rotating shaft 5, and a bearing cover 13 formed in the grease pocket 9.

[0015] The main electric motor 1 is mounted on a bogie 41. Fig. Figure 2 shows a view of the main electric motor 1, attached to the bogie 41, as seen from a vehicle body. The driving force from the rotating shaft 5 of the main electric motor 1 is transmitted via a coupling 45 and a gear 44 to a wheel axle 42 and rotates a wheel 43.

[0016] Between two end sections, an air outlet channel 14 is formed in a direction parallel to the rotating shaft 5 on a surface of the housing 10 facing the vehicle body. This channel allows air to escape from the interior of the housing 10 into the end section facing the blower 6. Between the two end sections, an air inlet channel 15 is formed in the other end section for drawing air into the interior of the housing 10. An air inlet channel cover 20 is arranged on the air inlet channel 15. This cover has an opening 21 for air to flow in a direction perpendicular to the Y-axis and forms an airflow passage 22 from the opening 21 to the air inlet channel 15. In embodiment 1, the opening part 21 is positioned closer to the air outlet channel 14 than the air inlet channel 15, and air flows from the side of the air outlet channel 14 parallel to the X-axis and into the opening part 21.The shape of the opening part 21 is not limited to the above example and an opening surface can, for example, be inclined towards the side of the air inlet duct 15 from a position where the X-axis intersects the opening surface and the opening can be directed towards the side opposite the air outlet duct 14.

[0017] Fig. Figure 5 is a perspective view of the air intake duct cover according to embodiment 1. A section of the air intake duct cover 20 is shown at Fig. Number 5 has been omitted. Fig. Figure 6 is a cross-sectional drawing of the air inlet duct cover according to embodiment 1. Fig. Figure 6 is a cross-sectional drawing along line BB in Fig. 1. The air intake duct cover 20 is equipped with a guide plate 24 that directs air flowing from the opening part 21 through the airflow passage 22 to a section in the outer circumferential surface 23 facing the vehicle body. This is achieved by maintaining an airflow path between the guide plate 24 and the section in the outer circumferential surface 23 of the air intake duct cover 20 parallel to the X-axis direction, thus separating the opening part 21 and the air intake duct 15. An outlet channel 25 is formed in the outer circumferential surface 23, which discharges foreign matter, such as dust, rain, snow, or the like, contained in the air guided from the guide plate 24 to the outer circumferential surface 23. The air intake duct cover 20 further comprises the following: an air outlet duct cover 26, which covers the outlet duct 25, separates the outlet duct 25 and the air inlet duct 15 from each other and provides an airflow path from the opening part 21 to the outlet duct 25; and a pair of cylindrical elements 27, one end of which is connected to two holes formed in the air outlet duct cover 26 and the other ends of which point towards each other in the Y-axis direction, the cross-sectional area of ​​which tapers from one end to the other end.

[0018] Fig. Figure 7 is a drawing showing air and foreign matter flows occurring in the vehicle's main electric motor according to embodiment 1. When the pressure inside the housing 10 decreases due to the release of air from the housing 10's air outlet duct 14 as a result of the fan 6's rotation, as indicated by the hatched arrow, the air containing foreign matter flows into the airflow passage 22 from the opening part 21. Due to the guide plate 24, air flowing in from the opening part 21 is directed along the outer circumferential surface 23 to the section facing the vehicle body. As the pressure inside the housing 10 decreases, the air directed to the side of the outer circumferential surface 23 flows into the housing 10 from the air inlet duct 15.However, the foreign particles, which have a greater mass than air, move along the outer circumferential surface 23, as indicated by the black arrows, due to centrifugal force and inertia, and are thus discharged from the outlet channel 25. The air flowing in from the air inlet channel 15 passes between the stator 3 and the rotor 4 and performs a heat exchange with them. After this heat exchange, the air is discharged to the outside of the housing 10 through the air outlet channel 14.

[0019] Fig. Figure 8 is a drawing showing air and foreign body flows occurring in the air inlet duct cover according to embodiment 1. The structure that prevents the backflow of deposited foreign bodies is shown with reference to Fig. 8 described. In Fig. Figure 8 does not show the outer circumferential surface 23, and the outlet duct cover 26 is indicated by dashed lines. The separated foreign matter is guided to the outlet duct 25. Even if the pressure inside the housing 10 decreases due to the rotation of the blower 6, the outlet duct cover 26 is provided, which separates the outlet duct 25 and the air inlet duct 15 from each other, thus preventing the separated foreign matter from entering the air inlet duct 15. Furthermore, a pair of cylindrical elements 27 is provided, one end of which is connected to holes formed in the outlet duct cover 26, and the other end of which points towards each other in the Y-axis direction. Thus, the foreign matter is rotated around the cylindrical elements 27 and discharged from the outlet duct 25 due to gravity.However, the air flowing in through the opening part 21 and directed towards the outlet channel 25 passes through the cylindrical elements 27 and flows into the housing 10 of the air inlet channel 15. Because the cylindrical elements 27 are shaped such that the cross-sectional area decreases from the ends connected to the outlet channel cover 26 to the other ends, the inflow of foreign matter into the cylindrical elements 27 can be prevented, thus preventing a backflow of foreign matter towards the air inlet channel 15.

[0020] In embodiment 1, the outer circumferential surface 23 has a surface perpendicular to the Z-axis, a surface perpendicular to the X-axis, and a section of a cylinder with the Y-axis as its central axis. Furthermore, a section of the guide plate 24 is a plate-like element inclined towards the side of the air inlet channel 15 from a position in which a main surface of the plate-like element is perpendicular to the X-axis. The shapes of the outer circumferential surface 23 and the guides 24 are not limited to the examples described above, and these elements can have freely chosen shapes that allow foreign matter and air to be separated from each other by centrifugal force and inertia. In embodiment 1, the outlet channel 25 is formed in the outer circumferential surface 23 in the surface perpendicular to the vertical direction, and the outlet channel 25 releases foreign matter by gravity.The design position of the outlet channel 25 is not limited to the example described above, and the outlet channel 25 can be formed in the outer circumferential surface 23 in a surface intersecting the vertical direction. In embodiment 1, the cylindrical element 27 is shaped as a cylinder in which the cross-sectional area decreases from the end connected to the outlet channel cover 26 to the other end. The shape of the cylindrical element 27 is not limited to the example above, and the cylindrical element 27 has a freely chosen cylindrical shape in which the cross-sectional area decreases from the end connected to the outlet channel cover 26 to the other end.

[0021] As described above, the main electric motor 1 according to embodiment 1 of the present disclosure has the outlet channel cover 26 and the pair of cylindrical elements 27, one end of which is connected to the outlet channel cover 26, the other end of which points towards each other in the direction of travel of the vehicle, wherein the cross-sectional area of ​​the cylindrical elements 27 tapers from one end to the other end; and thus the backflow of the separated foreign bodies into the interior of the housing 10 can be prevented. Design 2

[0022] Fig. Figure 9 is a cross-sectional drawing of a vehicle main electric motor according to embodiment 2 of the present disclosure. In addition to the structure of the main electric motor 1 according to embodiment 1, the main electric motor 1 according to embodiment 2 is further equipped with an outlet element 28, one end of which is connected to the outlet channel 25. The outlet element 28 is cylindrical, and at another end of the outlet element 28 an outer outlet channel 29 is formed, which discharges the foreign bodies flowing in from the outlet channel 25. The cross-sectional area of ​​the outlet element 28 decreases from the outlet channel 25 to the outer outlet channel 29.

[0023] Fig. Figure 10 is a perspective view of an air inlet duct cover and an outlet element according to embodiment 2. Fig. 10, a section of the air inlet duct cover 20 is not shown. Fig. Figure 11 is a side view of the air inlet duct cover and the outlet element according to embodiment 2. The width of the outlet element 28 in the X-axis direction is fixed, and the cross-sectional shape of the outlet element 28 perpendicular to the X-axis can be considered triangular. Since the cross-sectional shape of the outlet element 28 perpendicular to the X-axis can be considered triangular, the cross-sectional area of ​​the outlet element 28 decreases from the outlet duct 25 to the outer outlet duct 29. The shape of the outlet element 28 is not limited to the shape of the example described above, and the cross-sectional shape of the outlet element 28 perpendicular to the X-axis can be trapezoidal.

[0024] Fig. Figure 12 is a drawing showing air and foreign body flows occurring in the air inlet duct cover and the outlet element according to embodiment 2. Fig. Figure 13 is a drawing showing air and foreign body flows occurring in the outlet element according to embodiment 2. Fig. In section 13, air containing foreign particles and flowing into the outlet element 28 from the outside is represented by the dashed arrows. In the example of Fig. 13. The air containing the foreign matter flows into the outlet element 28 from the outside in the positive Z-axis direction. The cross-sectional area of ​​the outlet element 28 increases from the outer outlet channel 29 towards the outlet channel 25, and thus the flow velocity of the air containing the foreign matter, which flows into the outlet element 28 from the outside, decreases as it approaches the outlet channel 25. Therefore, even if the blower 6 rotates, the pressure inside the housing 10 decreases, and air flows into the outlet element 28 from the outside, it is possible to prevent the air from flowing into the outlet element 28, through the outlet channel 25, and subsequently reaching the air inlet channel 15. Furthermore, by reducing the flow velocity of the air flowing into the outlet element 28 from the outside, the foreign bodies can be expelled from the outer outlet channel 29 with high efficiency.

[0025] In the manner mentioned above, according to the main electric motor 1 of embodiment 2 of the present disclosure, the outlet element 28 is arranged, one end of which is connected to the outlet channel 25, and the cross-sectional area of ​​the outlet element 28 decreases from the outlet channel 25 to the outer outlet channel 29 at the other end; and thus the arrival of the air containing the foreign bodies and flowing in from the outside at the air inlet channel 15 is prevented by flowing through the outlet channel 25 and the foreign bodies can be discharged with high efficiency. embodiment 3

[0026] Fig. Figure 14 is a cross-sectional drawing of the vehicle's main electric motor according to embodiment 3 of the present disclosure. Fig. Figure 15 is a perspective view of an air inlet duct cover and an outlet element according to embodiment 3.

[0027] The side view of the main electric motor 1 according to embodiment 3 is similar to that of Fig. 11. The main electric motor 1 according to embodiment 3 is equipped with the outlet element 28, which has a different shape than that of embodiment 2. In embodiment 3, the cross-sectional shape of the outlet element 28 perpendicular to the X-axis and the cross-sectional shape perpendicular to the Y-axis can be considered triangular, and, similar to embodiment 2, the cross-sectional area of ​​the outlet element 28 decreases from the outlet channel 25 to the outer outlet channel 29. Thus, similar to embodiment 2, even when the blower 6 rotates, the pressure inside the housing 10 decreases, and air flows into the outlet element 28 from the outside, it is possible to prevent the air from flowing into the outlet element 28, through the outlet channel 25, and subsequently reaching the air inlet channel 15.Furthermore, by reducing the flow velocity of the air flowing into the outlet element 28 from the outside, foreign particles can be expelled from the outer outlet channel 29 with high efficiency. The shape of the outlet element 28 is not limited to the shape of the example described above, and the cross-sectional shape perpendicular to the X-axis and the cross-sectional shape perpendicular to the Y-axis can be trapezoidal.

[0028] In the manner mentioned above, according to the main electric motor 1 of embodiment 3 of the present disclosure, the outlet element 28 is arranged, one end of which is connected to the outlet channel 25, and the cross-sectional area of ​​the outlet element 28 decreases from the outlet channel 25 to the outer outlet channel 29 at the other end; and thus the arrival of the air containing the foreign bodies, which flows in from the outside and through the outlet channel 25, at the air inlet channel 15 is prevented and the foreign bodies can be discharged with high efficiency. Design 4

[0029] Fig. Figure 16 is a perspective view of an air inlet duct cover and an outlet element according to embodiment 4 of the present disclosure. Fig. Figure 17 is a side view of the air inlet duct cover and the outlet element according to embodiment 4. The cross-sectional drawing of the main electric motor 1 according to embodiment 4 is similar to that of Fig. 9. The main electric motor 1 according to embodiment 4 is equipped with the outlet element 28, which has a different shape than that of embodiments 2 and 3. In embodiment 4, two outer outlet channels 29 are formed in the outlet element 28. The width of the outlet element 28 in the X-axis direction is fixed, the cross-sectional shape of the outlet element 28 perpendicular to the X-axis can be considered to be shaped such that two triangles are arranged in a row along the Y-axis direction, and, similar to embodiments 2 and 3, the cross-sectional area of ​​the outlet element 28 decreases from the outlet channel 25 to the outer outlet channel 29.

[0030] Fig. Figure 18 is a drawing showing air and foreign body flows occurring in the air inlet duct cover and the outlet element according to embodiment 4. Similar to embodiment 2, the separated foreign bodies are discharged from each of the two outer outlet ducts 29.

[0031] The cross-sectional area of ​​the outlet element 28 decreases from the outlet channel 25 to the outer outlet channel 29, and, similar to embodiments 2 and 3, even when the blower 6 rotates, the pressure inside the housing 10 decreases, and air flows into the outlet element 28 from the outside, it is possible to prevent the air from flowing into the outlet element 28, through the outlet channel 25, and subsequently reaching the air inlet channel 15. Furthermore, by reducing the flow velocity of the air flowing into the outlet element 28 from the outside, foreign particles can be expelled from the outer outlet channel 29 with high efficiency.

[0032] In the manner mentioned above, according to the main electric motor 1 of embodiment 4 of the present disclosure, the outlet element 28 is arranged, one end of which is connected to the outlet channel 25, and the cross-sectional area of ​​the outlet element 28 decreases from the outlet channel 25 to the outer outlet channel 29 at the other end; and thus the arrival of the air containing the foreign bodies and flowing in from the outside at the air inlet channel 15 is prevented by flowing through the outlet channel 25 and the foreign bodies can be discharged with high efficiency. Design 5

[0033] Fig. Figure 19 is a cross-sectional drawing of a vehicle main electric motor according to embodiment 5 of the present disclosure. In addition to the structure of the main electric motor 1 according to embodiment 1, the main electric motor 1 according to embodiment 5 is further equipped with a feedback plate 30, which is a plate-like element extending in the direction opposite to the airflow direction at the opening part 21 emerging from the guide plate 24. By providing the feedback plate 30, it is possible to prevent foreign bodies with a mass greater than or equal to a specified value from flowing from the opening part 21 into the airflow passage 22 among foreign bodies with a mass greater than air.

[0034] As described above, according to the main electric motor of embodiment 5 of the present disclosure, the provision of the return plate 30 makes it possible to prevent the inflow of foreign bodies from the opening part 21 to the airflow passage 22. Design 6

[0035] Fig. Figure 20 is a cross-sectional drawing of a vehicle main electric motor according to embodiment 6 of the present disclosure. Fig.Figure 21 is a perspective view of an air intake duct cover according to embodiment 6. In addition to the structure of the main electric motor 1 according to embodiment 1, the main electric motor 1 according to embodiment 6 is further equipped with a perforated plate 31, which is a plate-like element on the opening part 21 having a corrugated cross-section perpendicular to the Y-axis and through-holes 32 whose direction of passage is the X-axis direction. The provision of the perforated plate 31 makes it possible to prevent the inflow of foreign bodies with a larger cross-sectional area than that of the through-holes 32 into the opening part 21.

[0036] As described above, according to the main electric motor 1 of embodiment 6 of the present disclosure, the provision of the perforated plate 31 makes it possible to prevent the inflow of foreign bodies with a larger cross-sectional area than that of the through holes 32 into the opening part 21.

[0037] The present disclosure is not limited to the embodiments mentioned above. Other configurations are possible by combining embodiments among those mentioned above. For example, the feedback plate 30 for the main electric motor 1 can be provided according to one of embodiments 2 to 4, and the perforated plate 31 can be provided for the main electric motor according to one of embodiments 2 to 5.

[0038] The foregoing describes some exemplary embodiments for illustrative purposes. Although specific embodiments have been presented in the preceding discussion, it is obvious to a person skilled in the art that changes to the form and details can be made without departing from the overall concept and scope of protection of the invention. Accordingly, the description and the drawings are to be regarded as illustrations and not as limitations. This detailed description is therefore not to be understood as a limitation, and the scope of protection of the invention is defined solely by the pending claims, together with the complete range of equivalents to which such claims are entitled. Reference symbol list 1 Main vehicle electric motor 2 windings 3 Stator 4 Rotor 5 Rotary shaft 6 blowers 7 ball bearings 8 roller bearings 9 Fat pocket 10 cases 11 frames 12 bearing bracket 13 bearing caps 14 Air outlet duct 15 Air intake duct 20 Air intake duct cover 21 Opening part 22 Airflow passage 23 External perimeter area 24 Guide plate 25 Outlet channel 26 Outlet duct cover 27 Cylindrical element 28 Outlet element 29 Outer outlet channel 30 Return plate 31 perforated plate 32 Through hole 41 bogie 42 wheel axle 43 wheel 44 gear 45 coupling

Claims

Vehicle main electric motor (1) comprising: an electric motor for propelling a vehicle; a blower (6) attached to a rotating shaft (5) of the electric motor for rotation with the rotation of the rotating shaft (5); a housing (10) containing the electric motor and the blower (6) within, between two end sections in a direction parallel to the rotating shaft (5) of a surface of the housing (10) facing the vehicle body, comprising (i) an air outlet duct (14) formed at one end section facing the blower (6) for releasing air from the interior, and (ii) an air inlet duct (15) formed at the other end section of the two end sections for drawing air into the interior; and an air inlet duct cover (15).the opening part (21) for admitting air in a direction perpendicular to a direction of movement of the vehicle and forming an airflow passage (22) from the opening part (21) to the air inlet duct (15), wherein the air inlet duct cover (15) comprises: (i) a guide plate (24) for guiding air flowing in from the opening part (21) into the section facing the vehicle body in the outer circumferential surface (23) of the air inlet duct cover (20) parallel to the direction of movement inside the airflow passage (22), by blocking the space between the opening part (21) and the air inlet duct (15) to maintain an airflow path between the guide plate (24) and a section of the air inlet duct cover (20) facing the vehicle body in the outer circumferential surface (23), (ii) an outlet duct (25) which is located in the outer circumferential surface (23) is designed to prevent foreign bodies from entering,(iii) an outlet duct cover (26) that covers the outlet duct (25), separates the outlet duct (25) and the air inlet duct (15) from each other and leaves an airflow path from the opening duct (21) to the outlet duct (25), and (iv) a pair of cylindrical elements (27) whose one ends are connected to two holes formed in the air outlet duct cover (26) and whose other ends point towards each other in the direction of movement, the cross-sectional area of ​​the cylindrical elements (27) tapering from one end to the other. Main electric motor for a vehicle according to claim 1, wherein air flows into the opening part (21) arranged between the air outlet duct (14) and the air inlet duct (15) from the side of the air outlet duct (14) in the direction parallel to the rotating shaft (5) at a position closer to the air outlet duct (14) than to the air inlet duct (15), a section of the guide plate (24) is a plate-like element which is inclined towards the air inlet duct (15) from a position in which a main surface of the plate-like element is perpendicular to the rotating shaft (5), and due to the plate-like element, air flowing from the opening part (21) is guided to a section in the outer circumferential surface (23) which points towards the vehicle body. Vehicle main electric motor (1) according to claim 1 or 2, which further comprises: a cylindrical outlet element (28) of which one end is connected to the outlet channel (25), wherein in another end of the cylindrical outlet element (28) an outer outlet channel (29) is formed for venting the foreign bodies flowing in from the outlet channel (25), wherein the cross-sectional area of ​​the outlet element (28) decreases from the outlet channel (25) to the outer outlet channel (29). Vehicle main electric motor (1) according to claim 3, wherein the width of the outlet element (28) is defined in the direction parallel to the rotating shaft (5), and the cross-sectional shape of the outlet element (28) perpendicular to the rotating shaft (5) can be considered triangular. Main electric motor of the vehicle (1) according to claim 3, wherein the cross-sectional shape of the outlet element (28) perpendicular to the rotating shaft (5) and the cross-sectional shape of the outlet element (28) perpendicular to the direction of travel can be considered as triangular. Vehicle main electric motor (1) according to claim 3, wherein the outer outlet channel (29) is two of the outer outlet channels (29) formed at the other end of the outlet element (28), the width of the outlet element (28) is fixed parallel to the rotating shaft (5), and the cross-sectional shape of the outlet element (28) perpendicular to the rotating shaft (5) can be regarded as two triangles arranged in a row along the direction of travel. Vehicle main electric motor (1) according to one of claims 1 to 6, which further comprises: a feedback plate (30) which is a plate-like element extending from the guide plate (24) in the direction opposite to the direction of the inflow of air which takes place at the opening part (21). Vehicle main electric motor (1) according to one of claims 1 to 7, which further comprises: a perforated plate (31) in the opening part (21), wherein the perforated plate (31) is a plate-like element having a wave-shaped cross-section perpendicular to the direction of movement, wherein several through holes (32) are formed in the perforated plate (31), wherein the through holes (32) penetrate the perforated plate (31) in the direction parallel to the rotating shaft (5).

Images