JPH0681445B2 - Vehicle alternator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle alternator, and more particularly to an alternator having cooling fans at both ends of a field core.

[Conventional technology]

A conventionally known two-wheeled vehicle AC generator will be described with reference to FIG. As shown in FIG. 1, the conventional generator is composed of a field core 4 directly connected to an engine drive shaft and a stator 11 fitted in a cover 15, and is sealed by the cover 15.

[Problems to be Solved by the Invention]

According to the above configuration, the output of the stator is reduced due to the heat generated by the stator during power generation, and the physical size is increased to compensate for this, which has been an obstacle to reducing the size and weight of the vehicle. In addition, a voltage regulator for controlling this type of alternator and a rectifier for rectifying AC power to generate DC have been installed separately from the main body in order to prevent heat damage from the main body of the alternator. However, if the voltage regulator and the rectifier are mounted separately from the alternator body, wiring and mounting work are troublesome. Therefore, a structure having a small alternator body and incorporating a voltage regulator and a rectifier is required.

In order to meet this demand, for example, as shown in Japanese Utility Model Laid-Open No. 58-34565, it is conceivable to provide the generator with first and second cooling fans. However, in the case of a two-wheeled vehicle generator in which cooling air cannot be introduced from the engine side due to the mounting relationship, the cooling air intake port cannot be substantially provided for one cooling fan. Since this cooling fan can generate sufficient cooling air only with the intake port, there is a problem that the cooling fan cannot obtain a good cooling effect.

Therefore, the present invention provides a vehicular generator in which the first and second cooling fans are provided in the generator and the cooling air intake port is provided substantially only to one of the cooling fans. It is an object of the present invention to provide a vehicle generator in which a sufficient cooling effect can be obtained by the cooling fan.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is directed to a rotating shaft (1) driven by an engine of a vehicle and side surfaces opposed to convex portions of both side surfaces (4a, 4b) having radial irregularities formed on an outer peripheral portion. And a field core (4) fixed to the rotating shaft (1) and having a plurality of claw-shaped pole cores (9) protruding in the direction and meshing alternately in the circumferential direction, and the field core (4). A first cooling fan (5) and a second cooling fan (30) respectively provided on both side surfaces (4a, 4b) of the rotary shaft, and one end side of the rotary shaft (1) so as to be rotatable, First
The front housing (7) having a cooling air discharge port (7c) provided opposite to the cooling fan (5), and the other end of the rotary shaft (1) are rotatably held and
A rear housing (14) having a cooling air intake (31, 32) provided so as to face the cooling fan (30) of
The second cooling fan (30) is connected to the cooling inlet (31,3).
The air sucked in from 2) is guided toward the first cooling fan (5), and the fixed portion (30b) of the blade (30a) is provided with the convex portion of the side surface (4b) of the rotary shaft. The fan blade (30a) is arranged on the front side in the rotation direction of (1), and the axial distance between the blade (30a) and the side surface (4b) is the blade (30a).
Of the rotary shaft (1) is inclined so as to become smaller on the rear side with respect to the front side in the rotation direction, and the first cooling fan (5) is cooled by the cooling air from the second cooling fan (30). Is directed toward the cooling air discharge port (7c), and the fixed portion (5b) of the blade (5a) is forward of the convex portion of the side surface (4a) in the rotation direction of the rotation shaft (1). The fan blade (5a) is disposed on the side, and the axial distance between the blade (5a) and the side surface (4a) is the rotation axis (1) of the blade (5a). The present invention provides a vehicle AC generator that is inclined so as to become larger on the rear side with respect to the front side in the rotation direction.

[Operation and effect of the invention]

According to the above configuration, the second cooling fan rotates, the air compressed by the blade is guided to the first cooling fan side, and the first cooling fan rotates and is compressed by the blade. The air is guided to the discharge port, whereby the wind from the second fan can be smoothly guided to the discharge port via the first fan. Therefore, a good cooling effect can be obtained in a motorcycle such as a two-wheeled vehicle AC generator in which the cooling air inlet can be provided only on one end side of the generator.

〔Example〕

 An embodiment of the generator of the present invention will be described below with reference to the drawings.

In FIGS. 2 to 8, reference numeral 1 denotes a rotary shaft, which is driven by the vehicle engine. 2 is an oil seal, 3 is a front bearing, 4 is a field core fixed to the rotating shaft, 5 is a first cooling fan welded to the side surfaces 4a, 4b of the field core 4, and 6
Is an O-ring, and 7 is a front housing made of real aluminum.

As shown in FIGS. 6 and 7, the blade 5a of the first cooling fan 5 has an axial distance between the blade 5a and the side surface 4a of the field core 4 with respect to the front side in the rotation axis rotation direction of the blade 5a. The fixed portion 5b of the blade 5a is arranged on the front side in the rotation direction of the convex portion of the field core side surface 4a, which is inclined so as to be large on the rear side and has irregularities formed in the radial direction.

According to the blade 5a configured as described above, first, the air compressed by the blade 5a with the rotation of the rotating shaft 1 is fixed by the inclination of the blade 5a.
5b side to the tip side, then the fixed part 5b
Is arranged on the front side in the rotation direction, so that the second
The cooling air that is generated by the cooling fan and flows along the side surface of the claw pole core 9 can be smoothly guided to the blade 5a. The surface of the front housing 7 facing the blade 5a of the first fan 5 is tapered so as to move away from the field core 4 from the inner diameter side toward the outer diameter direction. The outer diameter of the fan blade is also high. This fan blade is formed by known press processing, punching processing and the like.

Reference numeral 8 is a stator winding, 9 is a claw pole core extending axially from the side surface convex portion of the field core 4, 10 is a field winding, 11 is a stator core, and 12 is a tightening bolt.

Further, 13 is a spigot joint surface of the front housing 7 and the rear housing 14, and 14 is a rear housing made of aluminum. Reference numeral 15 is a cover having a plurality of cooling air inlets 23 attached to the rear housing 14 by nuts 16 shown in FIG.

Reference numeral 17 is a rear bearing, 18 is a brush holder, and 19 is a brush, which is in sliding contact with the slip ring 20. 21 is a slip ring 20
This is a slip ring cover that covers the portion, and in this case, has a brush introduction opening at the upper end of the U-shaped cross-section portion integrally formed with the rear housing 14. An elastic body 22 is attached to the rear end of the slip ring cover 21.

Reference numeral 25 is a rectifier, and a diode 26 for three-phase full-wave rectification, which is connected by the Gretz connection, is mounted inside. As is well known, one end of one diode 26 is insulated from the metal case 28 by the insulating thin layer 27 and connected to the battery through a terminal not shown, and the other end of the diode 26 serves as a heat sink. It is connected to the. The other ends of both diodes 26 are connected by leads. Thus, two diodes connected in series are set as one set, and the other two diode pairs (not shown) are combined to form a three-phase full-wave rectifier circuit.

The terminal lead-out portion of the metal case 28 is sealed with a sealing material 29 made of synthetic resin. The metal case 28 has an arc shape and is attached by screws 51 (FIG. 5) so as to be in close contact with the surface of the rear housing 14 made of aluminum. The blade 30a of the second cooling fan 30 is shown in FIG.
As shown in FIG. 8, the axial distance between the blade 30a and the side surface 4b of the field core 4 is inclined such that the axial distance between the blade 30a and the side surface 4b of the field core 4 is smaller on the rear side than on the front side in the rotational axis direction of the blade 30a.
Similar to the blade 5a, the fixed portion 30b of the blade 30a is disposed and fixed in front of the convex portion of the field core side surface 4b in the rotational direction.

According to the blade 30a configured as described above, first, the air compressed by the blade 30a with the rotation of the rotary shaft 1 is moved from the tip side of the blade 30a to the fixed portion 30b side by the inclination of the blade 30a. You can lead, then
By arranging the fixed portion 30b on the front side in the rotation direction, it is possible to prevent the air guided as described above from interfering with the side surface 4b of the field core 4 and smoothly move the air to the side surface of the claw pole core 9. I can guide you.

A cooling air inlet 31 is formed in a portion of the rear housing 14 facing the second cooling fan 30, as shown in FIG. This cooling air inlet 31 is not shown in FIG. 4, but as shown in FIG.
Between the second cooling fan 30 and the second cooling fan 30, the wind sucked from the suction port 23 of the cover 15 flows to the cooling wind suction port 31 after flowing through the outer peripheral portion of the metal case 28, and the stator winding. The air is passed through the wire 8 and the field winding 10 and is discharged from the outer peripheral ventilation window (cooling air outlet) 7c of the front housing 7.

Reference numeral 15a is a shielding plate provided inside the cooling air inlet 23.

Further, a groove 32 (FIGS. 2 and 4) formed by cutting out one end of the housing is provided at a portion of the rear housing 14 where the metal case bottom 28a is in close contact. 32 surrounds the back side of the rectifier 25. Further, this groove 32 forms an inlet opening to the side surface of the housing, and communicates with the cooling air inlet 31. In other words, the cooling air also circulates around the back side of the metal case bottom portion 28a that serves as a heat sink.

33 is a wire connecting the stator winding 8 and the rectifier 25, and 34 is an insulating bush for insulating the wire 33 from the rear housing 14. A mounting stay 7a is formed integrally with the front housing 7.

Next, referring to FIG. 4, (for simplicity,
A rotating shaft and a brush are omitted in the drawing.) 40 is a voltage regulator, and a transistor is built in the case to control the current flowing through the field winding 10 to generate an electromotive force of the stator winding 8. Is controlled to be substantially constant. The voltage regulator 40 is attached to the rear housing 14 with screws 52. A brush holder 18 is attached to the rear housing 14 with screws 41.

Reference numeral 28 denotes a metal case of the rectifier 25, which is attached to the rear housing 14 with screws 51. 42 is an output terminal of the rectifier 25, and 34a is a synthetic resin holding plate integrated with the insulating bush 34 that supports the wiring 33.

A groove-shaped brush powder discharge port 50 is formed between the rear bearing 17 and the rear housing 14. Second cooling fan 30
Due to the rotation, a wind flowing from the inside of the slip ring cover 21 to the discharge port 50 is generated, and the brush powder is discharged from the brush powder discharge port 50 by this wind. Further, this wind passes through a maze-like passage formed inside the brush holder 18 and opening to the suction port 23 side and the slip ring cover 21,
It enters into the slip ring cover 21 from 23. Therefore, the brush 19 in the brush holder 18 is also cooled.

The above structure has the following effects.

That is, the blade of the second fan inclined as described above.
The air compressed by 30a is guided to the first fan side,
Further, as described above, the blade 5a of the inclined first fan is compressed and guided to the outside from the discharge port 7c, so that the flow of cooling air becomes smooth and the amount of cooling air is increased to enhance the cooling effect. Further, since the facing surface of the front housing facing the second fan blade 5a is tapered so as to move away from the fan blade in the outer diameter direction from the inner diameter of the fan blade, there is little ventilation resistance and the cooling air is discharged smoothly. .

Further, since the bearings are present on both sides of the field core 4 and the slip ring 20 is exposed to the outside of the rear bearing 17, the span (spacing) between the front bearing 3 and the rear bearing 17 can be reduced, and the field core 4 can be reduced. Since the amount of vibration is small and can be driven at high speed even when the is rotated at high speed, the generated output can be increased with a small physique. That is, even if the number of turns of the stator winding 8 is small, the rotation speed is high, so that a sufficient electromotive force can be obtained, the size is reduced, and the copper loss in the stator winding 8 can be reduced. In addition to the above structure, rear housing 14
Since the rectifier 25, the brush holder 18, and the voltage regulator 40 are fixed to the end face on the side opposite to the fan 30, the connection between the stator winding and the rectifier, and the brush holder and the voltage regulator can be done in the same plane. Not only that, but if the cover 15 is removed, replacement of parts in case of failure is easy and serviceability is good. Again cover
Since the shielding plate 15a is provided inside the cooling air intake port 23 of 15, it is possible to prevent the infiltration of water into the inside while traveling.

Further, FIG. 9 shows another embodiment of the present invention, in which a cooling air suction port 23 'is provided on the outer periphery of the engaging portion between the rear housing 14 and the cover 15, which is particularly suitable for steam car washing of vehicles. It is possible to prevent car wash water from entering the inside of the generator when water is injected from the rear end of the generator.

Next, FIG. 10 shows still another embodiment of the present invention, in which 7c is a discharge port and 23 is a cooling air suction port. The cooling air inlet 23 is provided on the outer peripheral portion of the cover 15. 5 and 30
Are the first and second cooling fans, and the arrow W shows the flow of wind. Further, 15a is a shielding plate, which is provided so as to face the cooling air intake port 23. In this embodiment, the cooling air inlet
The action of 23 with the shielding plate 15a makes it difficult for car wash water and the like to enter the generator.

Although only one cooling air intake port 23 is shown in FIG. 10, many cooling air intake ports 23 are usually provided in a ring shape in the radial direction of the rotary shaft 1. In order to further improve the waterproof structure, the cooling air intake port 23 should be located in the radial direction of the rotary shaft 1 so that when the generator is attached, the cooling air intake port 23 is oriented so that it faces the ground. It may be arranged in a ring shape, that is, an arc shape. In FIG. 10 as well, the front surface 7T of the front housing 7 facing the fan blade 5a is tapered so as to move away from the field core 4 from the inner diameter side toward the outer diameter direction. By providing the taper part 7T, the wind flow becomes very smooth.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a conventionally known AC alternator for a motorcycle, FIG. 2 is a longitudinal sectional view showing an embodiment of the generator of the present invention, and FIG. 3 is a rear view of the generator shown in FIG. FIG. 4 is an external view, FIG. 4 is a wiring diagram of a rectifier and the like seen from the rear by cutting a part of the cover of the generator shown in FIG. 2, and FIG. 5 is the one embodiment shown by cutting at a different angle from FIG. FIG. 6 is a front view of the rotor shown in FIG. 2, FIG. 7 is a left side view of the rotor, FIG. 8 is a right side view of the rotor, and FIG. 9 is a book. FIG. 10 is a vertical sectional view showing another embodiment of the invention, and FIG. 10 is a vertical sectional view showing still another embodiment. 1 …… Rotary shaft, 3 …… Front bearing, 4 …… Field core, 4a, 4b ……
Side of field core, 5 …… first cooling fan, 5a …… blade, 7 …… front housing, 7a …… installation stay, 7c …… outer peripheral ventilation window (cooling air outlet), 8 …… stator Winding, 10 ...
… Field winding, 11 …… Stator core, 14 …… Rear housing, 15 …… Cover, 17 …… Rear bearing, 18 …… Brush holder,
19 …… Brush, 20 …… Slip ring, 25 …… Rectifier, 30
…… Second cooling fan, 31,32 …… Opening (cooling air intake), 40 …… Voltage regulator.

Claims (1)

[Claims] 1. A rotary shaft (1) driven by an engine of a vehicle and projecting in opposite side directions from convex portions of both side surfaces (4a, 4b) having radial irregularities formed on an outer peripheral portion, A field core (4) having a plurality of claw-shaped pole cores (9) that are alternately meshed in the circumferential direction and fixed to the rotating shaft (1), and both side surfaces (4a, 4a, 4a) of the field core (4). The first cooling fan (5) and the second cooling fan (30) respectively provided in 4b) and one end side of the rotating shaft (1) are rotatably held and the first cooling fan (5) 5), the front housing (7) having a cooling air discharge port (7c) provided opposite to the second cooling fan (7), while rotatably holding the other end of the rotating shaft (1). Rear housing (14) having cooling air inlets (31, 32) provided opposite to (30)
The second cooling fan (30) guides the air sucked from the cooling suction port (31, 32) toward the first cooling fan (5), and the blade ( 30a)
Fixed part (30b) is disposed on the front side of the convex portion of the side surface (4b) in the rotation direction of the rotation shaft (1), and the fan blade (30a) is connected to the blade (30a). The axial distance between the side surface (4b) and the blade (30
a) is inclined so as to become smaller on the rear side with respect to the front side in the rotation direction of the rotating shaft (1), and the first cooling fan (5) is connected to the second cooling fan (30). The cooling air is guided toward the cooling air discharge port (7c), and the fixing portion (5b) of the blade (5a) is provided.
Is disposed on the front side of the convex portion of the side surface (4a) in the rotation direction of the rotating shaft (1), and the fan blade (5a) includes the blade (5a) and the side surface (4a). A vehicle AC generator in which the axial distance between the blades (5a) is inclined so as to be larger on the rear side with respect to the front side in the rotation direction of the rotating shaft (1).