JPH07194060A - Alternator for vehicle - Google Patents

Abstract

PURPOSE:To provide an alternator for a vehicle which can circulate a necessary amount of coolants to various heating sections different in calorific value. CONSTITUTION:A front coil end 51 and a rear coil end 52 are so wound and fixed as to oppose the magnetic pole iron core 3 fixed to a rotating shaft 2. Furthermore, a rectifier 13 generating heat and a voltage adjuster 14 are provided at the upper and lower sections back the rear racket 10. And, a cooling structure is provided in front within an alternator for a vehicle, and a liquid cooling mechanism is provided in the rear. The cooling structure is composed of a cooling fan 25 and a gap 26, and the liquid cooling mechanism is composed of a passage 18 for cooling the rectifier provided in parallel, a passage 19 for cooling the voltage adjuster, a tube 30 for cooling the periphery of the coil, and a tube 31 for cooling the rear of the coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alternator applied to vehicles such as automobiles.

[0002]

2. Description of the Related Art In recent years, the engine room tends to be narrowed in order to improve the habitability of vehicles such as automobiles. For this reason, the inside of the engine room has a high density, and there is a demand for downsizing of the vehicle AC generator. Further, from the viewpoint of improving safety and increasing the added value, electronic control of the device in the engine room is attempted, and its power consumption tends to increase. For this reason, the temperature inside the engine room is accelerated, and in order to cope with this, further improvement in the cooling performance of the vehicle alternator is required.

As a cooling system for a vehicle AC generator, an air-cooling system in which a cooling fan is rotated together with a rotating shaft to perform forced cooling is generally used. However, recently, from the viewpoint of cooling efficiency, a vehicle AC generator having a liquid cooling type cooling structure has come into use. That is, a method has been used in which the heat of the heat generating portion is absorbed by the cooling liquid and the heat is transmitted to the heat radiating portion.

Conventionally, as this type of vehicle AC generator,
For example, the one disclosed in Japanese Patent Publication No. 5-16261 as shown in FIG. In FIG. 12, reference numeral 10
Reference numeral 1 denotes a rotor, and a magnetic pole iron core 103 is fixed to a rotary shaft 102 of the rotor 101. A plurality of magnetic pole claws are arranged in a row at a predetermined interval on the circumference of the magnetic pole iron core 103. Further, reference numeral 104 is an enclosure made of a good heat conductive metal material, and covers the first and second coil ends 105a and 105b at both ends of the stator coil 105 from both sides. The inside of the enclosure 104 is filled with an insulating material 106 made of synthetic resin, whereby the enclosure 104 is filled.
Is liquid-tightly fixed to the stator iron core 107. Code 10
Reference numeral 8 denotes a front bracket that holds the stator iron core 107 (in the drawing, the left direction is front), and the peripheral portion of the enclosure 104 is sandwiched by the annular groove 108a. A flow passage 109a for the cooling liquid is formed along the circumferential direction between the front bracket 108 and the enclosure 104.

On the other hand, reference numeral 110 is a rear bracket,
An inflow port 111 for the cooling liquid is provided on the upper side of the rear bracket 110, and an outflow port (not shown) is adjacently provided on the back side of the inflow port 111 in the drawing. A flow passage 109b for the cooling liquid is formed along the circumferential direction between the rear bracket 110 and the rear enclosure 104. A cooling cover 112 made of a metal having good thermal conductivity is liquid-tightly attached to the outer side of the rear bracket 110, and a cooling liquid branch is provided between the cooling cover 112 and the rear bracket 110. The flow passage 109c is formed. As a result, the cooling liquid from the branch hole 110c is circulated and returned to the middle of the flow passage 109b from a return hole (not shown).

As described above, the rectifier 113 and the voltage regulator 114 are fixed to the outside of the cooling cover 112 having the branch flow passage 109c inside through the heat sink 113a and the heat sink 114a. That is, the branch flow passage 109c is provided in series from the upstream side to the downstream side, the voltage regulator 114 or the like having a small heat generation amount is arranged on the upstream side of the branch flow passage 109c, and the rectifier 113 or the like having a large heat generation amount is provided on the downstream side. It is arranged and cooled efficiently. In the figure, reference numerals 115 and 116 are bearings,
117 is a pulley.

With such a configuration, the cooling liquid 100 flowing from the inflow port 111 allows the flow passage 109a and the flow passage 109 to flow.
b and flow as indicated by arrows X and Y to cool the stator iron core 107 and the stator coil 105, and then flow out from the outlet (not shown). In addition, from the inflow port 111 to the flow passage 10
A part of the cooling liquid flowing into 9b flows into the branch flow passage 109c from the branch hole 110c, flows in the branch flow passage 109c as indicated by an arrow Z, and flows to the rectifier 113 fixed to the cooling cover 112. After cooling the voltage regulator 114, it returns to the middle of the flow passage 109b.

[0008]

In the conventional vehicle alternator, the flow passages such as the branch flow passage 109c are provided in series, and the voltage regulator 114 having a small heat generation amount is connected to the branch flow passage 109c.
Are arranged on the upstream side, and the rectifier 113, etc., which generates a large amount of heat are arranged on the downstream side, so that the flow rate of the cooling liquid for cooling each heat generating portion is constant. For this reason, the cooling liquid 100 becomes more downstream in the branch flow passage 109c and the like.
Temperature rises, and the cooling temperature required for the downstream heat generating portion cannot be satisfied. On the other hand, if the flow rate of the cooling liquid 100 is set so as to satisfy the cooling temperature required for the heat generating portion on the downstream side, there is a problem that excessive cooling water is required.

Further, if the flow passages are formed in series, the overall flow passage resistance increases. Therefore, in order to cool a heat generating portion having a large heat generation amount, a very large pressure difference between the upstream side and the downstream side is required. Will be required. Therefore, there is a problem that a seal portion that holds the flow passage and the like in a liquid-tight manner may be damaged due to a large pressure difference.

The present invention has been made to solve the above problems, and provides a vehicle alternator capable of circulating a required amount of cooling liquid to heat generating portions having different heat generation amounts. The purpose is to

[0011]

In order to achieve the above object, the vehicular alternator of the present invention according to claim 1,
A rectifier cooling flow passage for guiding the cooling liquid to the rectifier is provided on the second bracket, and a voltage regulator cooling flow passage for guiding the cooling liquid to the voltage regulator is provided on the second bracket separately from the rectifier cooling flow passage. A first cooling tube that circulates a cooling liquid around the first coil end of the stator coil is wound around the first coil end, and the rectifier cooling flow passage, the voltage regulator cooling flow passage, and the first cooling tube are provided. Were provided in parallel with each other.

Further, in the vehicle alternator according to the second aspect of the invention, a separate second cooling tube for circulating the cooling liquid around the second coil end of the stator coil is wound on the outside of the second coil end. I attached it.

In the vehicle alternator of the third aspect, a cooling fan for air cooling is attached to the magnetic pole iron core.

Further, in the vehicle alternator according to the fourth aspect, the flow passes through the rectifier cooling flow passage, the voltage regulator cooling flow passage, and the first and second cooling tubes provided in parallel with each other. A distribution amount adjusting means for adjusting the flow rate of the cooling liquid was provided.

[0015]

According to the vehicle alternator, the cooling liquid is guided to the rectifier by the flow passage for cooling the rectifier, and the rectifier is cooled by the cooling liquid. Further, the cooling liquid in the voltage regulator cooling flow passage provided separately from the rectifier cooling flow passage is guided to the voltage regulator, and the voltage regulator is cooled by this cooling liquid. On the other hand, the cooling liquid in the first cooling tube wound outside the first coil end of the stator coil is
Circulation around the first coil end cools the first coil end. Further, since the passages of the respective cooling liquids are provided in parallel, it is possible to appropriately adjust the amount of the cooling liquid in the respective passages, and it is possible to efficiently cool the heat generating portions.

According to another aspect of the vehicle AC generator of the present invention, the second coil is formed by the cooling liquid circulating inside the second cooling tube which is a separate body and is wound around the second coil end of the stator coil. The ends are cooled from the environment. Therefore,
The entire generator can be cooled more effectively.

According to the vehicle alternator of the third aspect, the rotation of the magnetic pole iron core causes the cooling fan to rotate, and the rotation of the cooling fan causes air to flow inside the generator. The iron core and exciting coil are cooled.

According to the vehicle alternator of the fourth aspect, the distribution amount adjusting means allows the cooling liquid to flow through the rectifier cooling flow passage, the voltage regulator cooling flow passage, and the first and second cooling tubes. The flow rate can be adjusted easily and optimally.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. Example 1. FIG. 1 is a sectional view showing a vehicle alternator according to a first embodiment of the present invention. The vehicle alternator of the present embodiment is a generator having an air-cooled and liquid-cooled cooling structure, and is mounted on a vehicle engine (not shown) with the right side of FIG. 1 as the front side and the left side as the rear side. .

Reference numeral 1 is a rotor, which includes a rotating shaft 2 and a magnetic pole iron core 3. The rotating shaft 2 is rotatably supported by bearings 15 and 16 mounted in the center of a front bracket 8 as a first bracket and a rear bracket 10 as a second bracket that are fitted and fixed to the stator iron core 7. It is supported. A pulley 17 is attached to the front end of the rotary shaft 2, and a belt (not shown) wound around the pulley 17 transmits engine rotation to the rotary shaft 2.

The magnetic pole iron core 3 is fixed to the rotary shaft 2, and a plurality of magnetic pole claw portions are provided in a row at the peripheral edge portion thereof. A stator coil 50 is wound around the stator iron core 7 fixed so as to face the magnetic pole iron core 3, and the stator coil 50 projects from the front and rear surfaces of the stator iron core 7. It has a front coil end 51 and a rear coil end 52 as heat generating parts. Front coil end 51
And the rear coil end 52 constitutes the first coil end and the second coil end of the present invention, respectively. Further, a rectifier 13 and a voltage regulator 14 as heat generating parts are provided below and above the rear surface of the rear bracket 10. The rectifier 13 and the voltage regulator 14 are fixed to the rear surface of the rear bracket 10 via heat sinks 13a and 14a. The cover 12 is attached from the outside of the rectifier 13 and the voltage regulator 14. An air cooling structure is provided in the front part of such a vehicle alternator,
A liquid cooling structure is provided at the rear part.

The air cooling structure has a cooling fan 25 and a rotor 1.
Of the front and rear brackets 8 and 10 and the inner peripheral surfaces of the front and rear brackets 8 and 10. Cooling fan 25
Is formed of a ring-shaped fan body 25a fixed to the front surface of the magnetic pole iron core 3, and a plurality of fan blades 25b arranged in a row at the peripheral edge of the fan body 25a. As a result, when the magnetic pole iron core 3 rotates together with the rotating shaft 2, the cooling fan 25 rotates integrally with the magnetic pole iron core 3 to suck outside air into the intake port 8.
Inhale from a. Then, the air in the gap 26 is circulated by the fan blade 25b and then discharged from the exhaust port 8b.

On the other hand, in the liquid cooling structure, the rectifier cooling flow passages 18 and the voltage regulator cooling flow passages 19 which are separately provided so as not to mutually interfere with each other, that is, are provided in parallel.
And a coil peripheral surface cooling tube 30 and a coil rear surface cooling tube 31. As shown in FIG. 2, the flow passage 18 for cooling the rectifier is formed with a hole for cooling liquid flow that curves inside the rear bracket 10 along the outer shape of the rear bracket 10. Specifically, the rectifier cooling flow passage 18 communicates with the inflow port 11 provided at the upper end of the rear bracket 10 at one end thereof, passes through the back surface of the rectifier 13, and is adjacent to the inflow port 11 at the other end. It communicates with the outlet 21 provided. Then, in order to cool the rectifier 13 efficiently, an opening 10a is formed in the rear bracket 10, and the heat sink 1 is covered so as to cover the opening 10a.
3a is attached, and the rectifier 13 is attached from above the heat sink 13a. As a result, the inflow port 1
The cooling liquid 100 flowing in from 1 flows through the flow passage 18 for cooling the rectifier as indicated by the arrow A, and the heat sink 13a
After cooling the rectifier 13 via the, the rectifier 13 is allowed to flow out from the outflow port 21.

The voltage regulator cooling passage 19 is formed by a cooling liquid flow hole that is immediately curved at the upper portion of the rear bracket 10. Specifically, the voltage regulator cooling passage 1
9 communicates with the inflow port 11 at one end thereof, passes through the back surface of the voltage regulator 14, and has the outflow port 2 at the other end.
It communicates with 1. Then, in order to efficiently cool the voltage regulator 14, an opening 10b is formed in the rear bracket 10, and the heat sink 14a is formed so as to cover the opening 10b.
Is attached, and the voltage regulator 14 is attached from above the heat sink 14a. As a result, the inflow port 11
The cooling liquid 100 that has flowed in from the inside flows through the voltage regulator cooling flow passage 19 as indicated by arrow B, and the heat sink 1
After cooling the voltage regulator 14 via 4a, the outlet 21
It joins in and comes out.

In FIG. 1, the coil peripheral surface cooling tube 30 is a cooling tube for cooling the rear coil end 52 of the stator coil 50 from the outer peripheral surface, and is wound around the outer peripheral surface of the rear coil end 52. It is stuck in the state. The coil rear surface cooling tube 31 is a cooling tube for cooling the rear coil end 52 from the rear surface, and is fixed along the rear surface of the rear coil end 52. Both ends of these cooling tubes 30 and 31 are fixed to the upper portion of the rear bracket 10 by nipples 22 as shown in FIGS. 3 and 4. That is, as shown in FIG. 4, both ends of the coil peripheral surface cooling tube 30 (coil rear surface cooling tube 31) fixed to the rear coil end 52 are attached to the mounting opening 10 c formed in the upper portion of the rear bracket 10. It is bent in a circular arc shape toward, is inserted into the mounting port 10c, and is sandwiched by the nipple 22. The coil peripheral surface cooling tube 30
Of course, both ends of the (coil rear surface cooling tube 31) may be bent straight toward the mounting port 10c.

More specifically, as shown in FIG. 5, a wide portion 30a (31a) formed at the tip of the coil peripheral surface cooling tube 30 as the first cooling tube (the coil rear surface cooling tube 31 as the second cooling tube). ) Is the mounting port 10c
It is placed on the lower convex portion 10d. Then, the washer 23 is capped on the wide portion 30a. As shown in FIGS. 6 and 7, the washer 23 is provided with a protrusion 23a for preventing rotation, and the washer 23a is fitted into the groove 10e of the mounting opening 10c. By crowning 23, rotation of the cooling tube 30 (31) is prevented. Then, from above the washer 23, the nipple 2
The second screw portion 22a is screwed into the screw portion 10d of the mounting port 10c, and the tip of the coil peripheral surface cooling tube 30 (the coil rear surface cooling tube 31) is press-fixed to the mounting port 10c. As described above, the wide portion 30a of the coil peripheral surface cooling tube 30 (the coil rear surface cooling tube 31) is used.
After covering the (31a) with the washer 23, the nipple 22
The liquid-tightness and adhesiveness of the tip portion of the cooling tube 30 (31) are maintained by fixing with.

Here, the coil peripheral surface cooling tube 30 is used.
A modified example of the fixing structure of the tip portion of the (coil rear surface cooling tube 31) will be described with reference to FIG. In this fixing structure, a tapered surface 10f is formed in the lower portion of the mounting port 10c, and a thick portion 30b having a shape corresponding to the tapered surface 10f.
(31b) is formed at the tip of the cooling tube 30 (31), and the thick portion 30b (31) fitted to the tapered surface 10f is formed.
b) From the top, attach the screw portion 22a of the nipple 22 to the mounting port 10
It is structured such that the thick portion 30b (31b) is pressed by the taper portion 22b formed at the base of the nipple 22 by being screwed into the screw portion 10d in c. Due to this pressing force, the liquid tightness and adhesion of the tip portion of the cooling tube 30 (31) are maintained. By applying a lubricating agent such as grease to the outer periphery of the nipple 22, it is possible to prevent the cooling tube 30 (31) from twisting when the nipple 22 is screwed. Further, a known O-ring or the like may be used instead of the seal structure as described above.

As described above, since the coil peripheral surface cooling tube 30 and the coil rear surface cooling tube 31 are provided, as shown by the arrow in FIG. 4, the nipple 2 at one end is provided.
The cooling liquid 100 flowing in from 2 flows through the coil peripheral surface cooling tube 30 (coil rear surface cooling tube 31),
After cooling the rear coil end 52 from the outer peripheral surface (rear surface), it flows out from the nipple 22 at the other end. As a result, as shown in FIG. 1, the rear coil end 52 is
The coil peripheral surface cooling tube 30 and the coil rear surface cooling tube 31 liquid-cool the outer peripheral surface and the rear surface, and further, the cooling fan 25 air-cools the inner peripheral surface.

Next, the operation of this embodiment will be described.
When the engine is driven, the engine driving force is transmitted to the rotary shaft 2 via a belt (not shown) and the pulley 17,
The magnetic pole iron core 3 is rotated along with the rotation of the rotary shaft 2.
The cooling fan 25 is rotated by the rotation of the magnetic pole iron core 3, and the fan blade 25b blows the cooling fan 25.
The air in the gap 26 is agitated and circulated. This allows
The front coil end 51 is air-cooled from the surroundings, the rear coil end 52 is air-cooled from the inner peripheral surface, and the coolant 100 in the rectifier cooling flow passage 18 and the voltage regulator cooling flow passage 19 is also cooled by the generator. Air-cooled from the inside.

On the other hand, the rectifier cooling flow passage 18, the voltage regulator cooling flow passage 19, the coil peripheral surface cooling tube 30, and the coil rear surface cooling tube 31 which are arranged in parallel are connected to the cooling liquid 1.
00 are flowed in separately. The cooling liquid 100 that has flowed into the flow passage 18 for cooling the rectifier from the inlet 11 flows through the flow passage 18 for cooling the rectifier as shown by the arrow in FIG. As a result, the coolant 100 causes the rectifier 13 to move to the heat sink 13
Cool through a. Then, the cooling liquid 100 that has absorbed the heat from the rectifier 13 flows out from the outlet 21.

The cooling liquid 100 branched from the inflow port 11 and flowing into the voltage regulator cooling flow passage 19 flows in the voltage regulator cooling flow passage 19 as indicated by an arrow. Accordingly, the cooling liquid 100 flowing in the voltage regulator cooling flow passage 19 is not affected by the thermal influence of the cooling liquid 100 in the rectifier cooling flow passage 18 heated by the rectifier 13, and the voltage regulator 14 Is cooled via the heat sink 14a.
Then, the cooling liquid 100 that has absorbed heat from the voltage regulator 14 merges at the outlet 21 and then flows out.

Further, in FIG. 4, the nipple 2 at one end is
The cooling liquid 100 flowing into the coil peripheral surface cooling tube 30 from 2 flows through the coil peripheral surface cooling tube 30. As a result, the rear coil end 52 is cooled by the cooling liquid 100 from the outer peripheral surface. Then, the cooling liquid 100 which has absorbed heat from the rear coil end 52 has the nipple 2 at the other end.
It flows out from 2.

On the other hand, the cooling liquid 100 flowing from the nipple 22 at one end into the coil rear surface cooling tube 31 flows through the coil rear surface cooling tube 31. This allows
The cooling liquid 100 in the coil rear surface cooling tube 31 cools the rear coil end 52 from the rear surface without being thermally influenced by the cooling liquid 100 in the coil peripheral surface cooling tube 30. Then, the cooling liquid 100 that has absorbed heat from the rear coil end 52 flows out from the nipple 22 at the other end.

As described above, according to this embodiment, the flow passage 18 for cooling the rectifier, the flow passage 19 for cooling the voltage regulator, the coil 30 for cooling the coil peripheral surface, and the coil rear surface for cooling the coil have almost no thermal interference with each other. Since the tubes 31 are separately formed in parallel, the width W1 of the flow passage 18 for cooling the rectifier and the width W2 (see FIG. 3) of the flow passage 19 for cooling the voltage regulator are set to the rectifier 1.
3. The diameter of the coil peripheral surface cooling tube 30 and the coil rear surface cooling tube 31 can be arbitrarily set according to the heat generation amount of the voltage regulator 14 and the coil peripheral surface cooling tube 30 and the coil rear surface cooling tube 31. it can. As a result, the rectifier 1
3, a necessary and sufficient cooling liquid flow rate can be distributed to the voltage regulator 14, the rear coil end 52, and these heat generating portions can be efficiently liquid cooled.

Example 2. Next, a second embodiment of the present invention will be described. FIG. 9 is a sectional view showing the vehicle alternator according to the present embodiment. The vehicle alternator of this embodiment is different from the first embodiment in that not only the rear side of the generator but also the front side of the generator has a liquid-cooling cooling structure so that the entire structure is substantially sealed. The liquid cooling structure on the front side includes a cooling flow passage 41 provided in the front bracket 8 and a coil peripheral surface cooling tube 32 and a coil front surface cooling tube 33 attached to the front coil end 51.

The cooling flow passage 41 communicates with an inflow port 42 provided at the upper end of the front bracket 8, passes through the inside of the front bracket 8, and communicates with an outflow port (not shown) adjacent to the inflow port 42. There is.

The coil peripheral surface cooling tube 32 is a cooling tube for cooling the front coil end 51 from the outer peripheral surface, and is fixed around the outer peripheral surface of the front coil end 51 in a wound state. The coil front surface cooling tube 33 is a cooling tube for cooling the front coil end 51 from the front surface, and is fixed along the front surface of the front coil end 51. These cooling tubes 3
Both ends of 2, 33 are fixed to the upper part of the front bracket 8 by the nipples 22 shown in FIGS. 3 and 4, as in the first embodiment.

With this structure, the front coil end 51 is cooled from the outer peripheral surface by the cooling liquid 100 flowing into the coil peripheral surface cooling tube 32, and the front coil end 51 is cooled by the cooling liquid 100 in the coil front surface cooling tube 33. 51 is cooled from the front.

As described above, according to the present embodiment, since the front side of the generator is also liquid-cooled, the entire generator can be made into a substantially sealed structure, and the corrosion resistance and dustproofness against corrosive gas and the like are excellent. The front coil end 51 can be cooled to a lower temperature. Moreover, the coil peripheral surface cooling tube 32 and the coil front surface cooling tube 3 having almost no thermal interference with each other.
Since 3 and 3 are separately formed in parallel, the diameters of the coil peripheral surface cooling tube 32 and the coil front surface cooling tube 33 can be arbitrarily set according to the heat generation amount of the front coil end 51. Thereby, a sufficient cooling liquid flow rate can be distributed to the front coil end 51, and the front coil end 51 can be liquid-cooled more efficiently than in the first embodiment. Other configurations, functions and effects are similar to those of the first embodiment described above, and thus the description thereof is omitted.

Example 3. Subsequently, a third embodiment of the present invention will be described. FIG. 10 is a sectional view showing the vehicle alternator according to the present embodiment. The vehicle alternator of this embodiment differs from the second embodiment in that an air cooling type cooling structure is further provided on the rear side of the generator. This air-cooled structure has a cooling fan 55 mounted on the rear surface of the magnetic pole iron core 3 and a space 2
6 and 6.

The cooling fan 55 is a fan for cooling the exciting coil 56, and like the cooling fan 25, a ring-shaped fan body 55a fixed to the rear surface of the magnetic pole iron core 3 and a fan body 55a. And a plurality of fan blades 55b that are arranged in a line at the peripheral edge of the.

With this structure, when the magnetic pole iron core 3 rotates together with the rotating shaft 2, the cooling fan 55 rotates integrally with the magnetic pole iron core 3, and the fan blade 55b agitates and circulates the air in the gap 26. . As a result, the exciting coil 56 is cooled and an excessive temperature rise of the exciting coil 56 is prevented. Other configurations, functions and effects are similar to those of the second embodiment described above, and thus the description thereof is omitted.

Example 4. Finally, a fourth embodiment of the present invention will be described. FIG. 11 is a sectional view showing a main part of this embodiment. In the vehicle alternator of this embodiment, the bush 60 as the distribution amount adjusting means is attached to the rectifier cooling flow passage 18 and the voltage regulator cooling flow passage 19 in the first to third embodiments. Is different from.

The bush 60 is made of an elastic material such as rubber, and is press-fitted in the vicinity of the inlet 11 of the rectifier cooling flow passage 18 and the voltage regulator cooling flow passage 19.
That is, the bush 60 having the hole 61 of the predetermined diameter is
It has a structure in which the flow passage 18 for cooling the rectifier and the flow passage 19 for cooling the voltage regulator shown in FIG. The diameter of the hole 61 is the width W of the openings 18a and 19a.
When 1 and W2 are too large, it is set to a size such that the cooling liquid 100 having a flow rate suitable for cooling the rectifier 13 and the voltage regulator 14 is introduced.

Such a bush 60 is provided with openings 18a, 1
By being fitted into 9a, the flow passage 18 for cooling the rectifier,
The optimum amount of the cooling liquid 100 for the voltage regulator cooling passage 19
Can be distributed, and the rectifier 13 and the voltage regulator 14 can be cooled at a more suitable temperature.

Although not shown, such a bush 60 can be fitted into the nipple 22 to adjust the amount of the cooling liquid 100 flowing into the coil peripheral surface cooling tube 30 and the coil rear surface cooling tube 31. That is, when the winding specifications of the front coil end 51 and the rear coil end 52 are changed, by fitting into the bush 60 and the nipple 22, the amount corresponding to the amount of heat generated by the front coil end 51 and the rear coil end 52 after that. The cooling liquid can be made to flow into the cooling tubes 30 and 31.

In this embodiment, the bush 60 is used as the distribution amount adjusting means, but it is not limited to this.
For example, a lid or the like having a through hole having a predetermined opening area is configured to cover the openings 18a, 19a and the like shown in FIG. 3, and a lid having a different opening area of the through hole may be exchanged if necessary. May be. In this case, instead of replacing the lid, a lid whose opening area of the through hole can be changed may be used. Other configurations, functions and effects are similar to those of the first to third embodiments described above, and the description thereof will be omitted.

[0048]

As described above, according to the vehicle AC generator of the present invention, the magnetic pole iron core fixed to the rotary shaft rotated by the vehicle engine and rotated by the exciting coil, and the magnetic pole iron core A stator coil having a first coil end and a second coil end that are wound around a stator iron core surrounding the peripheral surface and project on both sides of the stator iron core in the rotation axis direction; and the stator iron core. The first bracket and the second bracket that support the rotation shaft in a rotatable manner while supporting the rotation shaft from both sides, the rectifier and the voltage regulator attached to the second bracket, and the second bracket,
A rectifier cooling flow passage for guiding the cooling liquid to the rectifier, and a voltage regulator cooling flow passage for guiding the cooling liquid to the voltage regulator, which is provided on the second bracket separately from the rectifier cooling flow passage. A first cooling tube that is wound outside the first coil end of the stator coil and that circulates a cooling liquid inside the stator coil; and the rectifier cooling flow passage, the voltage regulator cooling flow passage, and the first cooling tube. Since they are arranged in parallel with each other, the width of the flow passage for cooling the rectifier and the width of the flow passage for cooling the voltage regulator are set corresponding to the heat generation amounts of the rectifier and the voltage regulator, and the diameter of the first cooling tube is set. It can be arbitrarily set according to the heat generation amount of the first coil end,
As a result, a necessary and sufficient cooling liquid flow rate can be distributed to the rectifier, the voltage regulator, and the second stator coil, and there is an effect that these heat generating portions can be efficiently liquid cooled.

Further, in the vehicle alternator according to the second aspect, a separate second cooling tube for circulating a cooling liquid around the second stator coil is wound around the outer side of the second stator coil. Since the structure is attached, there is an effect that the whole can be cooled more efficiently.

In the vehicle alternator according to the third aspect of the invention, since the magnetic pole iron core is provided with a cooling fan for air cooling, the air in the generator is agitated and circulated by rotation of the cooling fan. The effect of cooling the exciting coil and preventing an excessive temperature rise of the exciting coil is obtained.

Further, in the vehicle alternator of the fourth aspect, the flow rate of the cooling liquid flowing through the rectifier cooling flow passage, the voltage regulator cooling flow passage, and the first and second cooling tubes is adjusted. Since the distribution amount adjusting means is provided, the optimum amount of the cooling liquid can be distributed to the rectifier cooling flow passage, the voltage regulator cooling flow passage, and the first and second cooling tubes. There is an effect that the voltage regulator, the first stator coil, and the second stator coil can be cooled at a more suitable temperature.

[Brief description of drawings]

FIG. 1 is a sectional view showing a vehicle AC generator according to a first embodiment of the present invention.

FIG. 2 is a rear view of a rear bracket.

FIG. 3 is a top view of the rear bracket with an inlet removed.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a cross-sectional view showing a fixing structure of the tip portions of the coil peripheral surface cooling tube and the coil rear surface cooling tube.

FIG. 6 is a plan view of a washer.

7 is a cross-sectional view of the washer of FIG.

FIG. 8 is a cross-sectional view showing a modified example of the fixing structure of the tip portions of the coil peripheral surface cooling tube and the coil rear surface cooling tube.

FIG. 9 is a sectional view showing a vehicle AC generator according to a second embodiment of the present invention.

FIG. 10 is a sectional view showing a vehicle AC generator according to a third embodiment of the present invention.

FIG. 11 is a sectional view showing an essential part of a fourth embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a vehicle AC generator according to a conventional example.

[Explanation of symbols]

 2 rotating shaft 3 magnetic pole iron core 8 front bracket (first bracket) 10 rear bracket (second bracket) 13 rectifier 14 voltage regulator 18 rectifier cooling flow passage 19 voltage regulator cooling flow passage 25 cooling fan 30 coil peripheral surface Cooling tube (first cooling tube) 31 Coil rear surface cooling tube (first cooling tube) 32 Coil peripheral surface cooling tube (second cooling tube) 33 Coil front surface cooling tube (second cooling tube) 50 Stator coil 51 front coil end (first coil end) 52 rear coil end (second coil end) 60 bush (distribution amount adjusting means)

Claims (4)

[Claims] 1. A magnetic pole iron core fixed to a rotary shaft rotated by an engine of a vehicle and rotated by an exciting coil, and a stator iron core surrounding a peripheral surface of the magnetic pole iron core, and the stator. A stator coil having a first coil end and a second coil end protruding on both sides of the iron core in the rotation axis direction, and supporting the stator iron core from both sides of the rotation axis direction,
A first bracket and a second bracket that rotatably hold the rotating shaft, a rectifier and a voltage regulator that are attached to the second bracket, and a rectifier cooling that is provided on the second bracket and that guides a cooling liquid to the rectifier. A flow passage and a flow passage for cooling the voltage regulator, which is provided in the second bracket separately from the flow passage for cooling the rectifier and which guides the cooling liquid to the voltage regulator, and the first coil end of the stator coil. A first cooling tube wound on the outside and circulating a cooling liquid inside; and the flow passage for cooling the rectifier, the flow passage for cooling the voltage regulator, and the first cooling tube provided in parallel with each other. AC alternator for vehicles. 2. A separate second cooling tube for circulating a cooling liquid around the second coil end of the stator coil is wound around the outside of the second coil end. Vehicle alternator. 3. The vehicle alternator according to claim 1, wherein a cooling fan for air cooling is attached to the magnetic pole iron core. 4. A distribution amount adjusting means for adjusting the flow rates of the cooling liquids respectively flowing through the rectifier cooling flow passage, the voltage regulator cooling flow passage, and the first and second cooling tubes is provided. The vehicle alternator according to any one of claims 1 to 3.