JP4931739B2 - AC generator for vehicles - Google Patents

Description

The present invention relates to a vehicle AC generator mounted on a passenger car or a truck or the like.

  In recent years, the demand for electric power in vehicles has been increasing with the increase in electronic devices. Further, the interior of the engine room has become narrower, and further reduction in size and increase in output are required for the AC generator for vehicles. On the other hand, in the vehicle alternator mounted on the vehicle, when the engine speed increases, the rotational speed of the vehicle alternator increases and the amount of cooling air also increases. For this reason, the cooling performance of the electronic component which is a component part which comprises the vehicle alternator increases with the increase in the rotation speed of the vehicle alternator.

  However, when the vehicle engine is operating, the gear is in the drive position, and when the vehicle is running, the brake is applied and the vehicle waits for a signal to stop, while the vehicle is running, the vehicle is stopped with the engine running. When the engine is in the idling state, a sufficient amount of cooling air cannot be obtained for the engine output. For this reason, a sufficient amount of cooling air is not obtained by the vehicle alternator, and the amount of heat generated by the components constituting the vehicle alternator increases. In the increase in the heat generation amount, the rectifying element for rectifying the AC power generated by the vehicle AC generator is particularly affected by the heat generation. When this rectifying element is affected by heat and exceeds the heat-resistant temperature, rapid deterioration occurs.

Therefore, conventionally, a heat dissipating fin structure has been proposed in which a plurality of axial heat dissipating fins are provided inside the heat dissipating plate having a high axial flow velocity to improve the heat dissipating property of the rectifying element (see, for example, Patent Document 1). .
JP 2005-509390 A

An object of the present invention, without increasing the cooling air flow rate by the vehicle alternator, efficiently rectifying the automotive alternator can perform cooling of the rectifier elements in the device in a limited space in the engine room Is to provide.

In order to solve the above-described problem, an automotive alternator according to the present invention includes a stator in which a multiphase stator winding is wound, a rotor provided in the stator via a rotation gap, A frame that supports the rotating shaft of the rotor and supports the stator, and a rectifying element for rectifying the AC power output from the stator winding are electrically connected to connect the rectifying element. In an automotive alternator comprising a rectifier comprising a heat sink for cooling, and a fan for allowing cooling air to flow into the rotor side via the rectifier,
A plurality of radiating fins extending substantially in the axial direction of the rotor is provided on the inner periphery of the radiating plate,
A gap is provided in a substantially axial direction between adjacent ones of the plurality of radiation fins,
The plurality of radiating fins are configured by at least two types of radiating fins having different lengths in a substantially axial center direction ,
An opening is formed in the substantially axial direction in order to allow cooling air to flow in the axial direction of the heat radiating plate, and one of the plurality of radiating fins extends in the outer peripheral direction of the heat radiating plate to be formed on the heat radiating plate. It is characterized by extending to the inside of the part .

The vehicle alternator according to the present invention includes a stator in which a multiphase stator winding is wound, a rotor provided in the stator via a rotation gap, and a rotating shaft of the rotor. A heat radiating plate for electrically connecting a frame for supporting the stator and a rectifying element for rectifying AC power output from the stator winding to cool the rectifying element A vehicular AC generator comprising: a rectifier comprising: a rectifier; and a fan that causes cooling air to flow into the rotor via the rectifier.
A plurality of heat dissipating fins extending substantially in the axial center direction of the rotor are provided on the inner periphery of the heat dissipating plate so that a space is formed between the adjacent heat dissipating fins in the substantially axial direction, and the first cooling air passage is formed by the air gap. Form
The plurality of radiating fins are composed of a radiating fin having a long length and a radiating fin having a short length, and the short radiating fin is disposed between the long radiating fins. A second cooling air flow path is formed by the tip of the long radiating fin and the tip of the short radiating fin.

The rectifier of the present invention includes a heat sink for electrically connecting and cooling a plurality of diodes of the same polarity, and a stator winding wound in multiple phases around a positive diode, a negative diode and a stator. In a rectifier having a connection terminal for electrical connection and a cooling air generator for generating cooling air passing through the heat sink,
A plurality of radiating fins extending substantially in the axial direction of the rotor is provided on the inner periphery of the radiating plate,
A first cooling air passage is provided between the heat dissipating fins adjacent to each other in the plurality of heat dissipating fins in a substantially axial direction.
The plurality of radiating fins are configured by at least two types of radiating fins having different lengths in a substantially axial center direction,
A second cooling air flow path formed by a plurality of heat dissipating fins is formed on the substantially axial center side of the heat dissipating fins.

  By reducing the flow resistance of the fin tip portion on the heat sink inner peripheral side, the fin with the longer fin length in the axial center direction of the fin without reducing the flow rate of the inflow air at the substantially axial center, The heat dissipation effect at the fin tip can be obtained.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out an automotive alternator and a rectifier according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing the overall structure of an embodiment of an automotive alternator according to the present invention.

  In FIG. 1, the direction corresponding to the left and right directions in the drawing is described as “axial direction”, the positional relationship corresponding to the left in the drawing is “front”, and the positional relationship corresponding to the right in the drawing is “back”.

[First embodiment]
1 to 5 show a first embodiment of an automotive alternator according to the present invention.

  The vehicle alternator of the present embodiment shown in FIG. 1 includes a front frame 1, a rear frame 2, a rectifier 3, a stator 4, a rotor 5, a brush 12, an IC regulator 15, The protective cover 9 is used.

  The front frame 1 is provided on the front side of the vehicle alternator, has an annular shape, sandwiches the stator 4 from the front side, and is fixed to the protective cover 9 with bolts (not shown).

  The rear frame 2 is provided on the rear side of the vehicle alternator and has an annular shape. The stator 4 is clamped in cooperation with the front frame 1 from the rear side, and is bolted (not shown). It is fixed to the front frame 1.

  A front bearing 7 is fitted to the front frame 1 at a substantially central portion on the inner peripheral side, and a rear bearing 8 is fitted to the rear frame 2 at a substantially central portion on the inner peripheral side. The shaft 19 is rotatably supported. One end side (front end side) of the shaft 19 protrudes outside the front frame 1 through the front bearing 7. Further, the pulley 6 is attached to the front end of the shaft 19 with a nut 25. The pulley 6 is for rotating a shaft 19, and a belt (not shown) is suspended between the pulley 6 and a pulley (not shown) attached to the output shaft of the engine. The engine output from the output shaft that rotates when the engine is started is transmitted to the shaft 19 via a pulley attached to the output shaft.

  That is, the pulley 6 is connected to a pulley provided on an output shaft of an engine mounted on the vehicle by a belt as drive transmission means. Thus, the pulley attached to the output shaft of the engine is rotated to run the belt, the rotation of the engine is transmitted to the pulley 6 through the belt, and the shaft 19 is rotated through the pulley 6. ing.

  On the other hand, the other end side (rear end side) of the shaft 19 protrudes from the rear bearing 8 toward the cover 9, and a slip ring 14 made of a conductive annular member is provided at the rear end of the shaft 19. ing.

  The stator 4 is configured by winding a stator winding 4 a and is supported by the front frame 1. A rectifier 3 that rectifies an alternating current into a direct current is connected to the stator winding 4a.

  The rotor 5 is configured by winding a field winding 5a around a rotor core 5c. The rotor 5 includes a shaft 19, rotor cores 5 b and 5 c having a plurality of claw magnetic poles, and a field winding 5 a wound around the rotor cores 5 b and 5 c. The field winding 5a is used for fielding the claw magnetic poles. Then, two slip rings 14 are press-fitted into one of the shafts 19 that are the rotation axis of the rotor 5.

  Further, cooling fans 10 and 11 for generating cooling air to allow cooling air to flow in from outside are provided on both end surfaces of the rotor cores 5b and 5c in the direction perpendicular to the axis.

  Two brushes 12 are supported by a brush holder 27 and are provided corresponding to the slip rings 14. The two brushes 12 are in sliding contact with the slip rings 14, and the rotor 5. The field winding 5a is electrically connected. The brush 12 is for supplying a field current to the field winding 5 a of the rotor 5 and for supplying power from the regulator to the field winding 5 a of the rotor 5.

  A spring 26 is housed in the brush holder 27 and presses the brush 12 in sliding contact with the rotating slip ring 14. Due to the sliding contact of the slip ring 14 with the brush 12, the battery current from a battery (not shown) is supplied to the field winding 5a as excitation power via the brush 12, the slip ring 14 and the field winding terminal 5d. To be supplied.

  Thus, both ends 5d of the field winding 5a described above are connected to the slip ring 14, and the brushes 12 are in contact with each other.

  The IC regulator 15 provided in the vicinity of the brush holder 27 controls the excitation power that flows to the field winding 5a of the rotor 5 via the brush 12 according to the required power from the vehicle. Thus, the three-phase alternating current output from the stator winding 4a of the stator 4 is adjusted.

  The protective cover 9 is for protecting the rectifier and the regulator.

  The front end face of the front frame 1 is provided with an inlet 20 through which cooling air generated by the cooling fan 11 flows in the direction of the rotation axis. An outer peripheral portion of the front frame 1 is located on the outer periphery from the inlet 20 and is provided with an outlet 21 for exhausting the cooling air flowing in from the inlet 20.

  On the other hand, the rear end surface of the rear frame 2 is provided with an inflow port 23 through which cooling air generated by the cooling fan 10 flows in the direction of the rotation axis. An outer periphery of the rear frame 2 is provided with an outlet 24 that is located on the outer periphery of the inlet 23 and for discharging the cooling air flowing in from the inlet 23.

  Further, in the protective cover 9, an inflow port 22 through which the cooling air generated by the cooling fan 10 flows is provided on the rear side end surface and the outer peripheral portion.

  In addition to the slip ring 14 and the brush 12, a rectifier 3 and an IC regulator (voltage regulator) 15 are provided on the rear side of the rear frame 2 and are protected by a cover 9.

  The rectifier 3 obtains a direct current output by full-wave rectifying the three-phase alternating current that is the output power of the stator winding 4 a of the stator 4. That is, the rectifier 3 rectifies an alternating current into a direct current.

  Next, the rectifier 3 will be described with reference to FIGS. FIG. 2 is a plan view of the rectifier 3, and FIG. 3 is a cross-sectional view of the rectifier 3.

  In FIG. 2, the rectifier 3 includes a plurality of positive diodes 3c, a positive-side heat radiation plate 3a that is a heat dissipation member in which the plurality of positive diodes 3c are press-fitted and fixed, a plurality of negative diodes 3d, and a plurality of negative diodes 3d. The negative-side heat radiating plate 3b, which is a heat-dissipating member, and the positive diode 3c and the negative diode 3d are electrically connected, and a constant insulation distance is maintained between the positive-side radiating plate 3a and the negative-side radiating plate 3b. The connection terminal 3e provided for this purpose.

  In the present embodiment, the negative-side heat radiating plate 3b is fastened and fixedly supported by bolts (not shown) to the plurality of cylindrical negative-electrode-side heat radiating plate supporting portions 2a behind the rear frame 2. A connection terminal 3e is laminated and attached to the negative heat sink 3b on the rear cover side of the protective cover 9 with respect to the negative heat sink 3b, and further laminated with the negative heat sink 3b through a gap. The positive-side heat radiating plate 3a is attached.

  Further, a bolt 13 as an output terminal is press-fitted and fixed to the positive-side heat radiating plate 3a, and a DC output rectified by a full-wave rectifier circuit is taken out and supplied to a battery (not shown) or an external load. To do.

  As shown in FIG. 3, the negative-side heat radiating plate 3b and the rear frame 2 are not in contact with each other except for the negative-side heat radiating plate supporting portion 2a protruding rearward from the rear frame 2. In other words, there is a gap for the cooling air 10d flowing in from the outer peripheral direction of the shaft to flow in.

  As shown in FIG. 4, the positive-side heat radiating plate 3a has a plurality of radiating fins 3f extending in the axial center direction from the diode fixing surface. Between each of the plurality of radiating fins 3f, openings 16 and 17 are provided for passage of cooling air flowing in the axial direction from the cooling air inlets 22 and 29.

  The plurality of heat radiating fins 3f attached to the positive electrode side heat radiating plate 3a are constituted by heat radiating fins 3f-1 having a long length and heat radiating fins 3f-2 having a short length. The plurality of heat radiating fins 3f attached to the positive electrode side heat radiating plate 3a include a long heat radiating fin 3f-1 and a short heat radiating fin 3f-2 in the axial center direction of the plurality of heat radiating fins 3f. As shown in FIG. 4, the long tip of the heat radiation fin 3 f-2 is sandwiched between the long heat radiation fins 3 f-2 and the long heat radiation fins 3 f-1 are arranged.

  By arranging the long heat radiation fins 3f-1 in such a manner as to sandwich the short heat radiation fins 3f-2, a space is formed between the plurality of heat radiation fins 3f and the slip ring case 30. This space forms the cooling air passage 16.

  By providing the short heat radiation fins 3f-2 between the long heat radiation fins 3f-1 in this way, in the heat radiation fins 3f, it is possible to avoid crowding of the heat radiation fins at the front end of the heat radiation fin axis. . It is possible to increase the number of fins of the radiating fins by avoiding the crowding of the radiating fins at the tip of the radiating fin shaft in the center direction. As a result, the heat radiation area of the diode fin can be increased, and the heat radiation performance of the heat radiation fin can be increased.

  As shown in FIG. 5, the positive-side heat radiating plate 3 a is provided with a cooling air ventilation path 18 in the axial direction, and radiating fins 3 j are provided at the edge of the cooling air ventilation path 18 so as to extend in the axial direction. It has been.

  In addition, as shown in FIGS. 1 and 5, the radiating fins 3f-9 of some fins of the radiating fins 3f provided on the inner periphery of the positive electrode side heat radiating plate 3a extend in the axial outer peripheral direction, and are positive electrode side heat radiating plates 3a. It is formed across the cooling air ventilation path 18 provided on the top.

  The positive-side radiator plate 3a and the negative-side radiator plate 3b are formed by aluminum die casting together with the radiator fins 3f. The positive-side heat radiating plate 3a and the negative-side heat radiating plate 3b may be formed of other aluminum die-cast materials whose physical properties are improved so as to improve the thermal conductivity or other metals having a good thermal conductivity.

  Next, the operation of the vehicular AC generator configured in this way will be described.

  In the vehicular AC generator according to the present embodiment, the rotor cores 5b and 5c are excited when receiving an exciting current in the field winding 5a via the brush 12 and the slip ring 14. When each of the rotor cores 5b and 5c is excited and a rotational driving force from a vehicle engine (not shown) is transmitted to the shaft 19 via the pulley 6, the rotor 5 rotates, and the stator of the stator 4 rotates. AC power is generated in the winding 4a. The AC power generated in the stator winding 4a is used for driving and storing electric equipment mounted on the vehicle via an output terminal 13 that is rectified by the positive diode 3c and the negative diode 3d in the rectifier 3 and configured by bolts. Output as DC power.

  At this time, the cooling fans 10 and 11 attached to the end faces of the rotor cores 5b and 5c together with the rotor 5 are rotated to draw air outside the machine, which is provided in the front frame 1 as indicated by the broken lines shown in FIG. Cooling air flows into the vehicle AC generator from the cooling air inlet 20 and the cooling air inlets 22, 28, and 29 provided in the protective cover 9. Of the cooling air that has flowed into the vehicle alternator, the cooling air that has flowed in from the front via the cooling air inlet 20 cools the field winding 5a and the stator winding 4a and from the cooling air outlets 21 and 24. Discharged.

  On the other hand, the cooling air 10a, 10b, 10c, 10d that has flowed in from the cooling air inlets 22, 28, 29 provided in the protective cover 9 as shown by the broken lines in FIG. Then, it flows into the rear frame 2 through the cooling air inlet 23. The cooling air 10a, 10b, 10c, and 10d flowing into the rear frame 2 is further guided to the cooling air outlet 24 while cooling the stator winding 4a of the stator 4, and the cooling air outlet 24 is connected to the outside. Discharged.

  The cooling air flowing in from the cooling air inlets 22, 28, 29 provided in the protective cover 9 behind the vehicle alternator as described above is classified into three as shown in FIG. One flows in from the cooling air inlets 22 and 29 provided in the protective cover 9 in the axial direction, passes through the radiation fins 3f attached to the inner periphery of the positive-side heat radiation plate 3a, and flows into the rear frame 2. Cooling air 10a and 10c. Two of them flow in at right angles to the axial direction from the cooling air inlet 28 provided in the protective cover 9, pass between the positive-side heat radiating plate 3 a and the diode connection terminal 3 e, and the cooling air inlet 23 at the rear of the rear frame 2. The cooling air 10b flows into the rear frame 2 more. Three of them flow in from the cooling air inlet 28 provided in the protective cover 9, pass through the gap between the negative-side radiator plate 3 b and the rear frame 2 from the outer peripheral direction of the negative-side radiator plate 3 b, and cool the rear of the rear frame 2. This is the cooling air 10 d that flows into the air inlet 23.

  A part of the cooling air 10c flowing from the cooling air inlet 29 provided in the protective cover 9 passes through the cooling air vent 18 illustrated in FIG. 9 joins the cooling air flow 10 a flowing in the axial direction from the cooling air inlet 22 provided in the air flow 9 and flows into the rear frame 2.

  Further, as shown in FIG. 4, a part of the cooling air 10c flowing from the cooling air inlet 29 provided in the protective cover 9 protrudes toward the protective cover 9 side of the radiating fin 3f installed on the positive-side radiating plate 3a. The long radiating fin 3f-1 and the adjacent short radiating fin 3f-2 pass through the opening 17 in the axial center direction and merge with the cooling air 10a. ing.

  Next, the effect of the vehicle alternator of this embodiment will be described.

(1) Effects of Cooling Air Passages 16, 17, and 18 In the present embodiment, openings (cooling air passages) 16 and 17 shown in FIG. 4 provided in the positive-side heat radiating plate 3a are provided in the protective cover 9. The cooling air inlets 22 and 29 are formed so as to follow the flow of the cooling air 10a and 10c flowing in the axial direction. Therefore, the flow resistance of the cooling air 10a and 10c flowing from the cooling air inlets 22 and 29 can be reduced, the flow of the cooling air 10a and 10c can be made smooth, and the positive-side heat radiating plate 3a is efficiently cooled. Wind can be contacted. For this reason, it is possible to improve the cooling performance of the positive diode 3c, which is one of the representative heating elements press-fitted and fixed to the positive-side heat radiating plate 3a.

  Further, in the opening (cooling air passage) 16, it is possible to reduce the channel resistance around the slip ring case 30 that covers the tip of the radiating fin 3 f and the slip ring 14 that is one of the representative heating elements. It becomes possible. For this reason, a sufficient flow rate for cooling can be ensured, the cooling performance of the tips of the radiation fins 3f can be improved, and the cooling performance of the slip ring 14 can also be improved.

  5 provided in the positive-side heat radiating plate 3a is opened so as to follow the flow of the cooling air 10c flowing in the axial direction from the cooling air inlet 29 provided in the protective cover 9. ing. For this reason, the flow resistance of the cooling air 10c in the cooling air passage 18 is reduced, and the radiation fins 3j extending in the axial direction disposed at the edge of the cooling air passage 18 and the cooling air passage (opening) 18 are provided. Since the flow of the cooling air 10c in the radiating fin 3f-9 that penetrates through can be made smooth, the heat dissipation of the positive-side radiating fin 3a can be improved. As a result, the cooling performance of the positive diode 3c, which is one of the representative heating elements press-fitted and fixed to the positive-side heat radiating plate 3a, can be improved.

  Further, the flow rate of the cooling air flowing into the rear frame 2 is increased by reducing the flow resistance of the cooling air by the cooling air passages (openings) 16, 17, and 18. Therefore, the stator winding 4a The cooling performance can be improved.

(2) Effects of Radiating Fins 3f, 3j, 3h A plurality of radiating fins 3f extend from the diode fixing surface to both ends in the axial direction on the inner peripheral portion in the axial center direction of the positive-side radiating plate 3a. Since a smooth flow of cooling air is formed by the cooling air passages (openings) 16 and 17 between 3f, an efficient cooling action can be obtained by a sufficient surface area obtained by the plurality of radiating fins 3f.

  In addition, a radiating fin 3f-9 is disposed at the edge of the cooling air passage (opening) 18 provided in the positive-side heat radiating plate 3a so as to penetrate the axially extending radiating fin 3j and the cooling air passage (opening) 18. The cooling air passage (opening) 18 has a smooth cooling air flow. For this reason, an efficient cooling effect can be obtained by a sufficient surface area obtained by the radiation fins 3j and the radiation fins 3f-9.

  Further, as shown in FIG. 3, in the gap formed between the positive-side heat radiating plate 3a and the connecting terminal 3e, the outer peripheral direction of the positive-side radiating plate 3a is on the connecting terminal 3e side of the positive-side radiating plate 3a. A plurality of heat radiating fins 3h are formed in the inner circumferential direction. For this reason, the cooling air 10b flowing through the gap between the positive-side heat radiating plate 3a and the connection terminal 3e is rectified to form a smooth air flow, and at the same time, the heat dissipation can be increased by the cooling air 10b.

  Furthermore, in the inner peripheral portion in the axial center direction of the positive-side heat radiating plate 3a to which the plurality of radiating fins 3f are fixed, an open state is established in the axial center direction between adjacent fins of the radiating fins 3f. Therefore, the channel resistance can be reduced. Therefore, on the surface of the positive electrode side heat radiating plate 3a and the portions of the plurality of heat radiating fins 3f, it is possible to smoothly flow the cooling air flowing on the surface of the positive electrode side heat radiating plate 3a and the portions of the plurality of radiating fins 3f. . For this reason, the heat dissipation effect of the positive electrode side heat sink 3a can be improved.

(3) Effects of Cooling Air 10d The cooling air flows from the cooling air inlet 28 provided in the protective cover 9 at the rear of the vehicle alternator, and the negative side heat radiating plate 3b and the rear frame 2 are connected from the outer peripheral direction of the negative side heat radiating plate 3b. The cooling air 10d passing through the gap and flowing into the cooling air inlet (cooling air inflow passage) 23 behind the rear frame 2 passes along the negative-side heat radiation plate 3b while directly cooling the bottom surface of the negative diode 3d. As a result, the cooling performance of the negative diode 3d can be improved.

  Moreover, in the rectifier 3 of this Embodiment, the length inserted | pinched between the long radiation fin 3f-1 which protrudes in the protective cover 9 side of the radiation fin 3f installed in the positive electrode side heat sink 3a. The number of short radiating fins 3f-2 is two, but the number of short radiating fins 3f-2 sandwiched between the long radiating fins 3f-1 is not limited to two. Alternatively, even if there is one or a plurality of three or more, the same effect as in the first embodiment shown in FIG. 4 can be obtained.

  Furthermore, in the rectifying device 3 of the present embodiment, the length of the radiating fin 3f installed on the positive-side radiating plate 3a is long and protrudes toward the protective cover 9 that sandwiches the radiating fin 3f-2 having a short length. The number of the radiating fins 3f-1 is arranged one by one on the short side of the radiating fins 3f-2, but the length arranged on one side of the radiating fins 3f-2 having a short length. The number of short radiating fins 3f-2 is not limited to one, and even if there are two or more, the same effect as in the first embodiment shown in FIG. 4 can be obtained.

  That is, the same effect as that of the first embodiment shown in FIG. 4 can be obtained even when the heat radiation fin 3f-2 having a short length is sandwiched between two or more long heat radiation fins 3f-1. Obtainable.

[Second Example]
FIG. 6 shows a second embodiment of the vehicle alternator according to the present invention.

  FIG. 6 (A) shows the shape of the plurality of heat radiation fins 3f arranged on the positive-side heat radiation plate 3a in the rectifying device 3 of the present embodiment, as compared with the root portions 3f-4 of the heat radiation fins 3f. 3f-3 is thinly formed.

  By forming in this way, a cooling air passage 16-a and a cooling air passage 17-a are formed between the two radiating fins 3f, and the same effect as in the first embodiment shown in FIG. Can be obtained.

  FIG. 6B shows that, in the rectifier 3 of the present embodiment, the plurality of heat radiation fins 3f arranged on the positive electrode heat radiation plate 3a are narrowed from the roots to the tips of the heat radiation fins 3f-5, respectively. It is formed with a large gradient.

  By forming in this way, the distance D1 between the tips of each radiation fin 3f is equal to the distance D2 between the roots of each radiation fin 3f, or the distance D1 between the tips of each radiation fin 3f is the distance D2 between the roots of each radiation fin 3f. It can be taken larger than

  Therefore, in the cooling air passage 16-b and the cooling air passage 17-b formed between the two radiating fins 3f, the air volume of the cooling air passage 16-b is not lowered than that of the cooling air passage 17-b. The same effect as the first embodiment shown in FIG. 4 can be obtained.

  FIG. 6C shows a long radiating fin 3f− projecting toward the protective cover 9 in the form of a plurality of radiating fins 3f arranged on the positive side radiating plate 3a in the rectifying device 3 of the present embodiment. 6 and the tip of the short radiating fin 3f-7 are connected by the radiating fin 3f-8, and the shape of the radiating fin 3f-8 is the same as the tip position and length of the long radiating fin 3f-6. It is formed so as to be curved in accordance with the tip position of the short heat radiation fin 3f-7.

  In this manner, the long heat radiating fin 3f-6 is arranged so as to sandwich the short heat radiating fin 3f-7, and the tip position of the long heat radiating fin 3f-6 and the short heat radiating fin 3f are arranged. The heat dissipating fins 3f-8 are formed by being curved in accordance with the tip position of -7.

  For this reason, a space is formed between the radiating fin 3f-8 and the slip ring case 30, and this space forms a cooling air passage 16-c. Further, between each of the short radiating fins 3f-7, a cooling air passage (opening) through which cooling air flowing in the axial direction from the cooling air inlets 22, 28, 29 provided in the protective cover 9 passes. ) 17-c is formed. The cooling air passage 16-c and the cooling air passage (opening) 17-c can cool the positive-side heat radiating plate 3a and the heat radiating fins 3f, and the same effect as that of the first embodiment shown in FIG. Can be obtained.

  Although the shape of the radiating fin and the diode cooling method described above are applied to the positive-side radiating plate 3a, the present invention can be similarly applied to the negative-side radiating plate 3b.

It is sectional drawing of the alternating current generator for vehicles of one Embodiment. It is a top view of a rectifier. It is sectional drawing of the alternating current generator for vehicles which shows the cross-section of a rectifier. It is the elements on larger scale of the inner peripheral direction side of the positive electrode side radiation fin in a rectifier. It is an enlarged view of the cooling air vent on the positive electrode side heat sink in a rectifier. It is another embodiment figure of the positive electrode side radiation fin shape in a rectifier. It is an inclination figure of a positive electrode side heat sink.

Explanation of symbols

1 ………………………………………… Front Frame 2 ………………………………………… Rear Frame 3 …………………………… …………… Rectifier 3a ……………………………………… Positive side heat sink 3b ……………………………………… Negative side heat sink 3c ……… ……………………………… Positive diode 3d ……………………………………… Negative diode 3e ……………………………………… Diode connection Terminal 3f ……………………………………… Positive side inner peripheral radiating fins 3g to 3j ……………………………… Positive side outer peripheral surface radiating fin 4 …………… …………………………… Stator 4a ……………………………………… Stator winding 5 ……………………………………… Rotor 5a ……………………………………… Field windings 5b, 5c ……… …………………… Rotor core 6 ………………………………………… Pulley 7 ………………………………………… Front bearing 8 ……… ………………………………… Rear Bearing 9 ………………………………………… Rear Cover 10 ……………………………………… Rear Fans 10a to 10d ………………………… Rear side cooling air 11 ……………………………………… Front fan 12 ………………………………… …… Brush 13 ………………………………………… Output terminal bolt 14 ……………………………………… Slip ring 15 ……………………… ……………… IC regulators 16 to 18 ………………………… Cooling air passage 19 ………………………………………… Shafts 20, 22, 23, 28 , 29 ... Cooling air flow Mouth 21, 24 ……………………………… Cooling air outlet 25 …………………………………… Pulley fixing nut 26 ………………………… …………… Brush fixing spring 27 …………………………………… Brush holder 30 ……………………………………… Slip ring case

Claims (5)

A stator in which a multiphase stator winding is wound, a rotor provided in the stator via a rotation gap, and a rotating shaft of the rotor are rotatably supported and the stator is supported. A rectifying device comprising a frame to be electrically connected to a rectifying element for rectifying the AC power output from the stator winding and cooling the rectifying element, and via the rectifying device In a vehicle AC generator comprising a fan for flowing cooling air into the rotor side,
A plurality of radiating fins extending substantially in the axial direction of the rotor is provided on the inner periphery of the radiating plate,
A gap is provided in a substantially axial direction between adjacent ones of the plurality of radiation fins,
The plurality of heat radiating fins are constituted by at least two types of heat radiating fins having different lengths in a substantially axial center direction ,
An opening is formed in the substantially axial direction in order to allow cooling air to flow in the axial direction of the heat radiating plate, and one of the plurality of radiating fins extends in the outer peripheral direction of the heat radiating plate to be formed on the heat radiating plate. An automotive alternator characterized in that it extends to the interior . At the edge of the opening of the cooling air passage formed in the heat sink,
The AC generator for vehicles according to claim 1, wherein a plurality of heat radiation fins are formed from an outer peripheral direction to an inner peripheral direction of the heat radiating plate. The plurality of radiating fins are:
The AC generator for a vehicle according to claim 1 or 2, wherein the vehicular AC generator is formed to extend from a fixed surface to which the diode as the rectifying element of the heat radiating plate is fixed to both sides in the axial direction . The plurality of radiating fins are:
From the side surface in the axial direction of the heat radiating plate, it is composed of a long radiating fin and a short radiating fin.
4. The vehicular AC generator according to claim 1 , wherein the plurality of radiating fins are provided with gaps between adjacent radiating fins . 5. The plurality of radiating fins are:
The vehicle alternator according to claim 1, 2, 3, or 4, wherein the vehicle alternator is formed by aluminum die casting .

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