JPH03178539A - Ac generator for vehicle - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of a generator by installing a coolant circulation device onto the side face of a bracket, circulation a coolant from the outside into the flow path of the circulation device and mounting a rectifier and a voltage regulator onto the outer surface of the coolant circulation device. CONSTITUTION:A coolant circulation device 17, to which an upper frame body and a lower frame body not shown as other bodies to brackets 1, 2 are fixed in a liquid-tight manner and joined through welding by sealing members and in which a flow path 17d is formed, is fastened onto the end face of the second bracket 2. Followable inflow pipe 23 and outflow pipe 24 are set up into the flow path 17d of the coolant circulation device 17. The heat sink of a rectifier 14 and the heat sink of a voltage regulator 16 are contact-bonded with the coolant circulation device 17 in an excellent thermal conductive manner. Accordingly, a coolant at a low temperature partially branched from the coolant circulating path of an engine and introduced into the inflow pipe is circulated as an arrow (e) in the figure, and efficiently cools the voltage regulator and the rectifier through the heat sinks, thus increasing an output from a generator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle alternator driven by an engine in a vehicle such as an automobile, and particularly relates to an improvement in cooling thereof.

[Prior Art] Conventionally, a vehicle alternator having a structure as shown in FIG. 3 is known. This generator includes a first bracket (1) and a second bracket (2) that are approximately bowl-shaped.
The stator core (3
A stator (3) formed by winding a stator coil (3b) around a).
) are disposed so as to be fitted and held between the opening ends of the first and second brackets (1) and (2). Also,
Bearings (4) are fitted and fixed to the center portions of both side surfaces of the first and second brackets (1) and (2).

The shaft (6) rotatably supported by the stator (5) has magnetic pole cores (7) and (8) located inside the stator (3).
) are fixed, and an excitation coil (9) is sandwiched between the inner peripheries of these magnetic pole iron cores (7) and (8). A fan (10
a) and (10b) are fixed. These pair of fans (10a) (fob) rotate with the rotation of the shaft (6). Further, a slip ring (11) is fixed to the rear end side of the shaft (6). The rotor (12) is made up of these shafts (6), pole iron cores (7), (8), magnetic pole coils (9), fans (10a) (10b), and slip rings (11). It is configured.

The end face of the first bracket (1) is provided with a cooling air suction hole (la) and a discharge hole (ib), and the end face of the second bracket (2) is also provided with a similar suction hole (2a). )
and a discharge hole (not shown). Further, at the inner end of the second bracket (2), there is provided a current collector (13) for power supply, which holds a brush (13a) in sliding contact with the slip ring (11), and a rectifier (14). A heat sink (14a) that radiates heat generated by the rectifier (14), and a voltage regulator (14a) that adjusts the terminal voltage to a predetermined value by detecting the generator voltage and controlling the excitation current.
16) and a heat sink (+6a) for dissipating heat generated by the voltage regulator (16). In the rectifier (14), excitation current is supplied from the brush (13a) to the excitation coil (9) via the slip ring (II), and the excitation coil (9) and the magnetic pole cores (7), (8 ) is connected to the pulley (15) by a mechanism not shown.
The stator coil (3
The alternating current induced in b) is rectified and converted into direct current. In the figure, reference numeral 20 denotes a bolt for tightening and fixing both brackets (1) and (2) with their open ends fitted to both ends of the outer periphery of the stator core (3a), as described above.

The conventional vehicular alternator is constructed as described above, in which an exciting current is supplied to the exciting coil (9) through the brush (13a) and the slip ring (+1), and the pulley (2'o1) is supplied by an engine (not shown). 15) through rotor (12)
When the stator coil (3b) is rotated, an alternating current is induced in the stator coil (3b), the alternating current is rectified by the rectifier (14), and the voltage is adjusted and output by the voltage regulator (+6). At that time, as the fans (LOA) and (10B) rotate, cooling air flows in from the suction hole (LA) of the first bracket (1) as shown by the arrow (A) in the figure, and the bearing (4) , the magnetic pole core (7), the exciting coil (9), the stator core (3a), and the stator coil (3b) are cooled and discharged to the outside from the discharge hole (lb). At the same time, cooling air flows in from the suction hole (2a) of the second bracket (2) as shown by the arrow (b), and the bearing (5), ! The pressure regulator (16), rectifier (14), pole iron core (8), excitation coil (9), stator coil (3b) are cooled, and the discharge hole (2b
) is discharged from.

[Problem to be solved by the invention] As mentioned above, in the conventional vehicle alternator, the bracket (
The stator coil (3b), etc. is cooled by letting cooling air flow in through the suction holes (la) and (2a) of 1) and (2) and exhausting it through the discharge holes (lb) and (2b). . However, in recent years, the trend of increasing output current in vehicle AC generators has become particularly noticeable, resulting in an increase in the amount of heat generated by the voltage regulator due to the addition of excitation current, and an increase in the output current due to the increase in output current. Child coil (3b) and rectifier (1
4) The problem of increased heat generation has occurred.

Conventionally, heat sinks (14
a), (16a) with many large heat dissipation fins,
Countermeasures have been taken, such as increasing the coil diameter of the stator coil (3a). Furthermore, as described in Japanese Patent Application Laid-Open No. 51-83557, a coolant passage is formed along the outer periphery of the stator, and a fan that rotates in conjunction with the stator and a coolant flowing through the coolant passage are formed. There have also been proposals in which the generator is cooled with a cooling fluid. However, as the output of the generator increases further, it becomes extremely difficult to suppress the temperature rise of the semiconductor components of the rectifier (14) and the voltage regulator (16) using the measures described above, and as a result, the power generation There is a risk that problems such as problems affecting the characteristics may occur.

In view of the above-mentioned problems, this invention provides an AC power generator for vehicles that can efficiently cool a rectifier and voltage regulator, as well as sufficiently cool stator coils, excitation coils, bearings, etc., and that can be supplied at low cost. [Means for Solving the Problems] A vehicle alternator according to the present invention is provided with a fan for circulating cooling air in a bracket, and is made of a member with good thermal conductivity. A coolant distribution device is provided on the side surface of the bracket so that a coolant from the outside flows through the flow path, and a rectifier and a voltage regulator are attached to the outer surface of the coolant distribution device.

[Function] In this invention, the bearings, magnetic pole cores, stator cores, stator coils, etc. are cooled by the action of the cooling air sucked by the fan, and the rectifier and The voltage regulator is cooled.

[Example] Fig. 1 shows an example of an alternator for a vehicle according to the present invention.
FIG. 2 is a side view showing the generator of the same embodiment with the protective cover removed. The basic configuration of the generator of this embodiment is the same as that of the conventional device shown in FIG.
The following will mainly explain parts specific to this embodiment.

In this embodiment, the end face of the second bracket (2) is made of a material with good heat conductivity, such as an iron-based or aluminum-based alloy, which is separate from the brackets (1) and (2), and Cationic electrodeposition.

The upper frame (17a) and the lower frame (17b), which are press-molded and coated with plating or epoxy powder coating, are connected to a sealing member (17c) consisting of a liquid gasket, a sheet gasket, an O-ring, etc. ), and by joining them by welding, caulking, or other joining means, a flow passage (17
The coolant distribution device (17) formed in d) is fixed with screws or the like. An inflow pipe (23) and an outflow pipe (24) that can flow in both directions are provided to the flow path (17d) of the coolant flow device (17), and a heat sink (14a) of the rectifier (14) is provided. ) and voltage regulator (
A heat sink (not shown) (16) is pressed to this coolant distribution device (17) for good conduction. Also for cooling! L distribution device (17) and current collector (13)
The protective cover (1
8) is provided. In addition, (19) in the figure is an insulated connection terminal block for connecting and insulatingly fixing the lead wire from the stator coil (3b) and the connection terminal (14b) of the rectifier (14) with the connection screw (21), ( 22) is a slip ring (11) provided integrally with the current collector (13).
) is provided to form a labyrinth structure with the protective tube (13b), and (25) is an output terminal.

In this embodiment, when the rotor (12) is driven and rotated by an engine (not shown), fans (10a) and (IOb) fixed to both end surfaces of the rotor (12) are installed.
Cooling air is sucked in from the outside by the action of That is, when the fan (10a) on the first bracket (1) side rotates,
As shown by the arrow (c) in the figure, external cooling air is sucked in from the suction hole (1a), and the bearing (5), the magnetic pole core (8),
Excitation coil (9), fixed core (3a), stator coil (
3b) is cooled and discharged to the outside from the discharge hole (lb). Similarly, the fan (10b) on the second bracket (2) side
) rotates, external cooling air is sucked in from the suction hole (2a) as shown by arrow (d), and the bearing (5), magnetic pole core (8), excitation coil (9), and stator core (3a) ,
The stator coil (3b) is cooled and discharged to the outside from the discharge hole (2b).

On the other hand, a portion of the low-temperature coolant is flowed from the coolant circulation path of the engine, guided to the inflow pipe (23) via a rubber hose, etc., flows as shown by arrow (e), and is applied to a voltage via a heat sink (not shown). The regulator (16) and also the rectifier (14) are efficiently cooled via the heat sink (14a). Furthermore, since a part of the coolant distribution device (17) is pressed into contact with the vicinity of the bearing (5) of the second bracket (2), this bearing (5) is also connected through the second bracket (2). It is endothermically cooled.

Also, as shown in the arrow (d) above, the second bracket (2)
The cooling air sucked in from the suction hole (2a) of
6) to directly cool them, the cooling fluid distribution device (18) passes outside the protective cover (18).
7) Since the IO flows on the surface of the lower frame body (17b), the ventilation resistance is small, the temperature is low, and the total air volume is significantly increased. Therefore, the cooling effect is large, and the stator coil (3b), excitation coil (9), bearing (4) (5)
) etc. are sufficiently cooled.

Furthermore, according to the structure of this embodiment, the cooling air is supplied to the rectifier (1
4) and the voltage regulator (16), for example, dust, salt water mist, etc. mixed in with the cooling air will accumulate on the electrode terminals of the rectifier (14) and voltage regulator (16). As a result, it is possible to prevent electrical corrosion from occurring and defects in power generation characteristics. moreover,
The protective cover (18) is connected to the rectifier (+4) and voltage regulator (1).
6) and the slip ring (11) are protected in a semi-sealed state, a generator with excellent environmental resistance against muddy water, dust, salt water, etc. can be obtained. Further, as described above, the coolant distribution device (17) includes at least the upper frame (17a).
Because an insulating film is formed on the surface of the rectifier (14) and voltage regulator (16) by applying cationic electrodeposition, epoxy powder coating, etc., deposits containing salt water may form on the electrode terminals of the rectifier (14) and voltage regulator (16). However, no electrolytic corrosion will occur.

Note that in the above embodiment, heat radiation fins, etc. are not provided in the coolant distribution portion of the upper frame (17a) of the coolant distribution device (17), but of course, heat radiation fins, etc. may be provided. This further improves cooling efficiency.

Further, in the above embodiment, the upper frame (17a) and the lower frame (17b) of the coolant distribution device (17) are connected to the seal member (
17c), but of course, all contact surfaces may be joined and integrated by welding or the like.

[Effects of the Invention] As described above, according to the present invention, bearings, magnetic pole cores, excitation coils, stator cores, stator coils, etc. are cooled by the cooling air sucked by the fan, and the cooling fluid distribution device cools the bearings, magnetic pole cores, excitation coils, stator cores, stator coils, etc. Since the rectifier and the voltage regulator are cooled by the cooling branch flowing through the channel, the cooling is efficiently performed, and therefore the exciting current can be increased to increase the output current.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of a vehicle AC generator according to the present invention, FIG. 2 is a side view of the generator shown in FIG. 1 with the protective cover removed, and FIG. 3 is a conventional vehicle AC generator. FIG. 3 is a longitudinal cross-sectional view of the generator. In the figure, (1) is the first bracket, (2) is the second bracket.
bracket, (3) is the stator, (3a) is the stator core, (3b) is the stator coil, (,1) (5) is the bearing, (6) is the shaft, (7) and (8) are the magnetic poles. Iron core, (9
) is an excitation coil, (10a), (10b) are fans, (
12) is a rotor, (14) is a rectifier, (16) is a voltage regulator, (17) is a coolant distribution device, (17d) is a flow path, and (8) is a protective cover. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A rotor magnetic pole core that is fixed to the rotating shaft and excited by an excitation coil, a stator core that surrounds this magnetic pole core and has a stator coil attached to it, and a stator core that supports this stator core and has a bearing for each. A first supporting the rotating shaft through the
and a second bracket, a pair of fans attached to both ends of the magnetic pole core and circulating cooling air inside the first bracket and the second bracket, a rectifier and a voltage regulator. In the vehicular alternator, a coolant distribution device made of a material with good thermal conductivity is provided on the side surface of the first bracket or the second bracket, and a flow path is formed inside the coolant distribution device for circulating the coolant from the outside. A vehicular alternator in which the rectifier and voltage regulator are attached to the outer surface of the coolant distribution device.