JP2017093184A - Rotary electric machine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear cover for a rotary electric machine for vehicle in which muddy water that is splashed by tires during traveling of a vehicle can be prevented by a waterproof prevention from being infiltrated from a suction port to the inside, without performing processing for closing the suction port even if the muddy water is infiltrated near an opening of the suction port.SOLUTION: The rotary electric machine for vehicle comprises: a stator 3; a rotor 2; a front bracket 4 and a rear bracket 5; a rotary shaft 11; fans 20 and 21; a frame-shaped case 14 including an inverter assembly 30 comprising a heat sink 28 for cooling and a control module 17; and a resin rear cover 15 fitted to the case 14 for covering and protecting the inverter assembly 30. In a bottom center part and an outer peripheral surface part of the rear cover 15, a plurality of vent holes 15a and 15b communicated to the fans 20 and 21 are provided and in the vent holes 15a provided in the outer peripheral surface part, a waterproof wall 15c covering the openings is provided. The waterproof wall 15c is configured integrally with the rear cover 15.SELECTED DRAWING: Figure 1

Description

  Some rotating electrical machines, such as alternators and motor generators, have rectifier circuits and brushes, which are heat-generating parts, placed outside the rear bracket that holds and incorporates the rotor in order to perform efficient cooling. There is. A rear cover is provided to protect the rectifier circuit, the brush, and the like arranged outside thereof, prevent intrusion of foreign matter, or insulate them. The present invention relates to the structure of the rear cover.

  As a conventional example of the rear cover, for example, as in the embodiment of Patent Document 1, a large number of air inlets for cooling the heat-generating parts are provided in the rear cover attached as one of the parts of the rotating electrical machine equipment. Further, in Patent Document 2, a waterproof cover is separately attached to the rotating electrical machine or the vehicle as a countermeasure for the rotating electrical machine being flooded by the splashing of muddy water or the like by the tire and the muddy water entering the equipment from the rear cover intake port. .

International Publication No. 2011/148825 JP-A-2005-143152

  In a rear cover attached to a conventional rotating electrical machine for a vehicle, a large number of air inlets must be formed to cool the heat generating components. For this reason, many intakes are exposed to water from the muddy water of the tires, etc., causing accidents such as corrosion of component parts due to the invading muddy water and abnormal wear due to intrusion into the brush sliding part. Is concerned. As a countermeasure, a separate waterproof cover is required, which increases the number of parts and the number of assembling steps, resulting in an increase in cost.

  A rotating electrical machine for a vehicle according to the present invention includes a stator having a stator winding, a rotor having a field winding that is rotatably supported facing the stator, a front bracket and a rear that hold the stator. Bracket, a rotor shaft rotatably supported via bearings provided on the front bracket and the rear bracket, and a fan that is attached to both ends of the rotor shaft and generates cooling air as the rotor rotates An inverter assembly having a rectifier module, a field module, a cooling heat sink for cooling these modules, and a control module, a frame-like case containing the inverter assembly, and a cover attached to the case to cover and protect the inverter assembly A rotating electrical machine for a vehicle having a resin-made rear cover, the rear cover A plurality of ventilation holes leading to the fan are provided in the bottom center part and the outer peripheral surface part, and each of the ventilation holes provided in the outer peripheral surface part is provided with a waterproof wall covering the respective opening parts. It is comprised integrally with the said rear cover.

According to the rotating electrical machine for a vehicle of the present invention, because the protection of the rotating electrical machine built-in parts, the prevention of foreign matter intrusion, and the rear cover for insulation and the waterproofing wall which is a waterproofing cover are made into one and the same integrated part, Even if the muddy water splashed by the tires enters the vicinity of the opening of the intake port while the vehicle is running, it is possible to prevent the muddy water from entering from the intake port by the waterproof wall without blocking the intake port.
As a result, even if it is assumed that the intake port is placed at the optimal position for cooling the heat-generating parts and the vehicle gets wet, the waterproof wall is provided, so the position of the intake port is changed. Coolability can be maintained without any problems. In addition, since there is no need to change the position of the air intake, there is no need to increase the number of types of rear covers, the increase in the number of parts and assembly man-hours can be reduced, and costs can be reduced. Thus, the waterproof wall can be easily manufactured.
Furthermore, the intake port on the outer peripheral surface portion may be enlarged when trying to take a large amount of intake air, but there is a problem in terms of intrusion and strength of foreign matters such as stepping stones. However, according to the present invention, the integration of the rear cover and the waterproof wall can realize the function of improving the cooling performance and preventing the intrusion of foreign matter without reducing the strength of the rear cover. In addition, when handling a rotating electrical machine, the presence of a waterproof wall protects against the risk of injury due to a finger entering the air inlet and the risk of electric shock.
In addition, when the rear cover is separate from the waterproof cover, the waterproof cover is often required due to the difference in the type of vehicle to be mounted, but the cost is increased. Even if the shape of the vehicle mounting part differs depending on the model of the electric machine, it is an original specification and it is highly possible that it can be used as a rear cover, so it is not necessary to change the rear cover for each vehicle wetness countermeasure. Cost can be reduced.
In addition, when it is not possible to close the air intake due to cooling problems of parts, a waterproof cover may be configured with a separate part. However, this is no longer necessary. Costs are reduced by reducing the number of mounting steps.

It is sectional drawing which shows the rotary electric machine for vehicles in Embodiment 1 of this invention. It is the side view which looked at the rotary electric machine for vehicles in Embodiment 1 of this invention from the rear side. FIG. 7 shows a waterproof wall of a rear cover of a rotating electrical machine for a vehicle according to Embodiment 2 of the present invention, and FIG. b) is a cross-sectional view of the AA line in FIG. It is a fragmentary sectional view which shows the waterproof wall of the rear cover of the rotary electric machine for vehicles in Embodiment 3 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.

Embodiment 1 FIG.
1 is a cross-sectional view showing a vehicular rotating electrical machine according to Embodiment 1 of the present invention, and FIG. 2 is a side view of the vehicular rotating electrical machine according to Embodiment 1 of the present invention as viewed from the rear side.

In FIG. 1, a rotating electrical machine 1 includes a rotor 2 in which a field winding 2a is wound around a field core 2b, a stator 3 in which a three-phase stator winding 3a is wound, intake ports 4a and 5a, and an exhaust port. Front bracket 4 and rear bracket 5 having 4b and 5b and accommodating rotor 2 and stator 3, magnetic pole position detection sensor 6 for detecting the rotation state of rotor 2, rectifier module 9 for supplying power, field The magnetic module 10 includes a control module 17 that controls them.
The rotating electrical machine 1 includes a drive unit 29 and an inverter assembly 30 as large components.

First, the drive unit 29 will be described.
The rotor 2 includes a rotating shaft 11 whose both ends are rotatably supported by the front bracket 4 and the rear bracket 5 via bearings 7 and 8, respectively. One end portion of the rotating shaft 11 protrudes from the front bracket 4, and a pulley 12 for transmitting and receiving torque to and from an internal combustion engine (not shown) is attached to the front end portion thereof, and the internal combustion engine is connected via a belt (not shown). Connected with.

  The rotor 2 has a slip ring 13 for supplying a field current to the field winding 2 a, and the slip ring protrudes rearward from the rear bracket 5. A brush 16 a that is in sliding contact with a slip ring 13 for energizing the field winding 2 a is held by the brush holder 16. Fans 20 and 21 for generating cooling air are attached to the end face of the field core 2b of the rotor 2.

The magnetic pole position detection sensor 6 is disposed coaxially with the rotary shaft 11 between the slip ring 13 and the bearing 8 outside the rear bracket 5 and detects the magnetic pole position of the rotary shaft 11, that is, the rotor 2.
The magnetic pole position detection sensor 6 includes a sensor stator 6a and a sensor rotor 6b. The sensor rotor 6b having only an iron core is provided on the rotating shaft 11 inside the sensor stator 6a, and the sensor stator 6a is attached to the cooling heat sink 28. The signal wiring is connected to the control module 17.

Next, the inverter assembly 30 will be described.
The inverter assembly 30 includes a rectifier module 9 in which switching elements for supplying armature current at the time of driving and rectification of armature current at the time of power generation together with peripheral circuits, and a switching element for controlling the field current. A frame-shaped case 14 including a field module 10 together with peripheral circuits, a cooling heat sink 28 on which the rectifier module 9 and the field module 10 are mounted, and a terminal connected to a power system terminal of each module. And a control module 17 configured with a control circuit for controlling the rectifier module 9 and the field module 10.

The case 14 and the cooling heat sink 28 have a rectangular parallelepiped shape in order to simplify the mountability of each module and the configuration of the peripheral circuit, and have a structure in which they are mounted and sealed with resin or the like.
The brush holder 16 is disposed in a space W that is located in the center of the inverter assembly 30 and through which the rotary shaft 11 passes, and is fixed to the inverter assembly 30.
A connecting board 18 and a boss 5c are provided on the rear side of the rear bracket 5 where the drive unit 29 is disposed, and the inverter assembly 30 is fixed to the rear bracket 5 by screws 22 after the inverter assembly 30 is assembled.

Thereafter, in order to protect and insulate the inverter assembly, the brush and the like attached to the outside of the rear bracket 5, the rear cover 15 is attached by the engaging portion 19 and the screw 22. As shown by the square frame in FIG. 2, the engaging portion 19 is composed of an engaging claw 19a on the rear cover side and an engaging claw receiving portion 19b on the case side. 14 is attached to the rear cover 15.
Further, after the rear cover 15 is mounted at the engaging portion 19, the vehicle side harness detent 26 of the output terminal portion 25 provided through the rear cover 15 is fixed by the nut 27 together with the harness detent 26. The

  The rear cover 15 is a resin molded product having elasticity and is formed in a bottomed shape, and has a shape that follows the outer peripheral shape of the inverter assembly 30 and the outer peripheral shape of the frame-like case 14. As shown in FIG. 2, stepped bulging step portions 15 e that protrude outward are formed on the three surfaces of the surface portion.

Further, the rear cover outer peripheral surface 15e1 that is the upper part of the bulging step portion 15e and the center of the bottom surface of the rear cover 15 are provided with air inlets (ventilating ports) 15a and 15b that lead to the fan 21 and cool the interior of the inverter assembly 30, respectively. It has been.
Further, a waterproof wall 15c that covers the opening of the intake port 15a and prevents water from entering the intake port 15a is formed on the outer edge of the intake port (ventilation port) 15a of the outer peripheral surface 15e1 of the rear cover. The resin is integrally molded to prevent water from entering the rotary machine from the intake port 15a due to water.

  Note that a reinforcing rib 15d that separates adjacent intake ports 15a is formed integrally with the rear cover 15 on the waterproof wall 15c of the rear cover.

Further, the intake port 15a and the waterproof wall 15c are separated into at least two locations. In other words, the intake port 15a and the waterproof wall 15c are not formed on the entire outer peripheral side surface of the rear cover 15, but the configuration is partially arranged around the heat generating component. In the first embodiment, the configuration is arranged in three places, X, Y, and Z.
By restricting (concentrating) the cooling air passages to several places facing the heat generating component part in this way, it is possible to increase the flow rate of the cooling air by eliminating unnecessary air flow and to improve the waterproofness due to moisture. it can.

  With the above configuration, during operation of the rotating electrical machine, the exhaust of the fans 20 and 21 rotating with the rotor 2 causes negative pressure in the drive unit 29, and the intake port 15a provided on the outer peripheral surface portion of the rear cover and the central portion of the bottom surface are provided. The outside air is sucked from the intake port 15b, and the modules and the like which are heat generating parts are cooled by the ventilation.

According to the first embodiment, even if muddy water splashed by the tires during traveling of the vehicle enters the vicinity of the opening of the intake port 15a, the muddy water can be prevented from entering from the intake port 15a to the inside by the waterproof wall 15c. .
As a result, even if it is assumed that the intake port 15a is disposed at an optimal position for cooling the heat-generating parts and the vehicle gets wet, the waterproof wall 15c is provided. Coolability can be maintained without changing the position. Further, since there is no need to change the position of the intake port 15a, there is no need to increase the type of the rear cover, and the waterproof wall 15c can be easily manufactured by using the rear cover 15 as a resin molded product.

Embodiment 2. FIG.
Based on FIG. 3, the rear cover of the rotating electrical machine for the vehicle in the second embodiment will be described.
FIG. 3 is an explanatory view showing the waterproof wall of the rear cover. This rear cover is applied from the X position of FIG. 2 and is a view as seen from the windward side of the cooling air that is opposite to the traveling direction of the vehicle.

For example, assuming that the left side of FIG. 2 is attached to the vehicle so that the left side is the front side of the vehicle (traveling direction), the right side is the rear side of the vehicle, and the vertical direction is the vertical direction, the waterproof wall for the rear cover in the vehicle front-rear direction position 15c may be provided with a second intake port 15a2 that makes it difficult for water to enter the intake port 15a. It is difficult for water to enter, for example, as shown in FIG. 3, the second intake port 15a2 is different from the intake port 15a. However, the water does not enter the intake port 15a as it is, and the water hangs down in the ground direction due to gravity. By adopting such a configuration, it is possible to increase the air flow rate to the rotating electrical machine from the vehicle traveling direction while avoiding water intrusion into the rotating electrical machine due to flooding from the top and bottom due to the jumping up of the tire. Will improve. Note that the position and shape of the second air inlet 15a2 are optimal in experiments and the like depending on the mounting angle on the vehicle and the situation of water.
The main cause of the second intake port 15a2 is that it is from the lower direction that is splashed up by the tire, or the water that has been splashed up hits the bonnet and falls from there, but it is mainly subject to water in the longitudinal direction of the vehicle. If the number is less than that, the second air inlet 15a2 as described above may be provided.
Since the basic configuration is the same as that of the first embodiment, description thereof is omitted.

Embodiment 3 FIG.
A rear cover of the rotating electrical machine for the vehicle in the third embodiment will be described based on FIG.
In FIG. 4, the rear cover 15 according to the third embodiment has a structure in which a waterproof wall 15c extends in a tapered shape in the outer circumferential direction, and foreign matter such as dust is difficult to accumulate. This eliminates the concern that the cooling air passage becomes narrow.
In the waterproof wall 15c of the first embodiment, there is no hole for discharging intruders for that purpose, so it is conceivable that dust or condensed water accumulates and narrows the ventilation path, but this cover portion is tapered. By adopting the shape, it becomes difficult for foreign matter to collect and a ventilation path can be secured, so that stable cooling can be maintained.
Since the basic configuration is the same as that of the first embodiment, description thereof is omitted.

  In the present invention, each embodiment can be appropriately modified or omitted within the scope of the invention.

1: rotating electric machine, 2: rotor, 2a: field winding, 2b: field core, 3: stator
5: Rear bracket, 5c: Boss, 9: Rectifier module,
10: field module, 11: rotating shaft, 14: case, 15: rear cover,
15a: an intake port (ventilation port) on the outer peripheral surface of the rear cover (the upper part of the bulging step portion 15e),
15a2: the second intake port (ventilation port),
15b: Inlet port (ventilation port) at the center of the bottom surface of the rear cover,
15c: waterproof wall, 15d: reinforcing rib, 15e: bulging step,
15e1: rear cover outer peripheral surface (the upper part of the bulging step portion 15e),
17: Control module, 18: Connecting board, 19: Engagement part,
21: Fan, 22: Screw, 28: Cooling heat sink,
29: Drive unit, 30: Inverter assembly

A rotating electrical machine for a vehicle according to the present invention includes a stator having a stator winding, a rotor having a field winding that is rotatably supported facing the stator, a front bracket and a rear that hold the stator. Bracket, a rotor shaft rotatably supported via bearings provided on the front bracket and the rear bracket, and a fan that is attached to both ends of the rotor shaft and generates cooling air as the rotor rotates An inverter assembly having a rectifier module, a field module, a cooling heat sink for cooling these modules, and a control module, a frame-like case containing the inverter assembly, and a cover attached to the case to cover and protect the inverter assembly an electric motor vehicle provided with a resin-made rear cover which, said rear cover A bottom portion covering the inverter assembly, and an outer peripheral shape of the inverter assembly and an outer peripheral surface portion of the frame shape along the outer peripheral shape of the frame-shaped case, and the heat generating component of the inverter assembly at the outer peripheral surface portion of the rear cover Are formed in a stepped bulging step portion projecting outward with a step, an outer peripheral surface portion of the rear cover which is a top portion of the bulging step portion, and a central portion of the bottom portion of the rear cover. Are provided with ventilation openings that lead to the fan and cool the inside of the inverter assembly, and the outer edge of the ventilation opening provided on the outer peripheral surface portion of the rear cover covers the opening of the ventilation opening. A waterproof wall that prevents water from penetrating into the bulging step portion is formed integrally with the bulging step portion, and the waterproof wall is provided with a reinforcing rib that isolates the adjacent ventilation openings. There are those that are provided integrally with the bulging step portion.

Claims (5)

A stator having a stator winding, a rotor having a field winding that is rotatably supported facing the stator, a front bracket and a rear bracket for holding the stator, and a front bracket and a rear bracket, respectively. A rotor shaft rotatably supported through a provided bearing, a fan attached to both ends of the rotor shaft to generate cooling air as the rotor rotates, a rectifier module, a field module, and the like An inverter assembly having a cooling heat sink for cooling a module and a control module, a frame-like case including the inverter assembly, and a resin rear cover attached to the case and covering and protecting the inverter assembly A rotating electric machine,
A plurality of ventilation holes communicating with the fan are provided at the bottom center portion and the outer peripheral surface portion of the rear cover, and a waterproof wall for covering each opening portion is provided at each ventilation opening provided in the outer peripheral surface portion. A rotating electrical machine for a vehicle, wherein a wall is formed integrally with the rear cover.   The vent hole provided in the outer peripheral surface portion of the rear cover and the waterproof wall that covers the vent hole are disposed in at least two locations of the outer peripheral surface portion facing the periphery of the heat generating component. The rotating electrical machine for a vehicle according to 1,   The waterproof wall of the rear cover at a position in the vehicle front-rear direction is provided with a second vent hole for preventing direct intrusion of water into the vent hole in a state of standing with the vent hole. Item 2. The rotating electrical machine for a vehicle according to Item 1.   The rotating electrical machine for a vehicle according to claim 1, wherein the waterproof wall has a tapered shape that expands outward.   The rotating electrical machine for a vehicle according to claim 1, wherein adjacent ventilation openings provided in a peripheral surface portion of the rear cover are separated by a reinforcing rib integrally formed with the rear cover.

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