JPH07170695A - Alternator for vehicle - Google Patents

Abstract

PURPOSE:To provide an alternator, for a vehicle, which does not require any space at all in the radial direction by a method wherein a heat-dissipating part by a heat pipe is installed adjacent to the axial direction of a generator body. CONSTITUTION:The alternator is composed of a generator body 16, of a heat- dissipating part 18 which is installed adjacent in its axial direction and of heat pipes 17a, 17b, 17c which are extracted in the axial direction from a front bracket 1a and which connect both.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle AC generator which uses a heat pipe for heat transfer between a generator body and a heat radiating portion.

[0002]

2. Description of the Related Art FIG. 9 shows, for example, US Pat. No. 4,295,067.
FIG. 7 is an axial sectional view showing a conventional AC generator disclosed in Japanese Patent Publication No. In the figure, 1 is a housing, 2 is a rotary shaft supported by bearings 3 and 4 in the housing 1, 5 is a rotor fixed to the rotary shaft 2, 6 is an exciting coil built in the rotor 5, and 7 is a rotor. A stator mounted in the housing 1, 8 is a rectifier connected to a stator coil 9 of the stator 7, 10
Is a regulator connected to the exciting coil 6 via the slip ring 11 and the brush 12, and 13 is a heat pipe A for moving the heat generated in the vicinity of the stator 7 to the outside to radiate the heat. The heat collecting part 13a embedded in the pipe and the heat radiating part 1 protruding to the outer peripheral surface of the housing 1.
It consists of 3b. Reference numeral 14 denotes a heat pipe B that transfers the heat generated near the rectifier 8 to the outside to dissipate the heat.
The housing 1 includes a heat collecting portion 14a embedded in the end wall of the housing 1 and a heat radiating portion 14b protruding from the end surface of the housing 1 to the outer peripheral surface. Reference numeral 15 is a cooling fin that is arranged so as to straddle the heat radiating portions 13b and 14b of both heat pipes 13 and 14, respectively.

In such a structure, the heat generated near the stator 7 is collected by the heat collecting portion 13a of the heat pipe A13 embedded in the outer peripheral side wall of the housing 1, and thereafter,
Heat generated in the vicinity of the rectifier 8 is also transferred to the heat radiating portion 13b outside the housing 1 and radiated.
After being collected by the heat collecting portion 14a, the heat is moved to the heat radiating portion 14b outside the housing 1 to radiate the heat, and the inside of the housing 1 is cooled.

[0004]

As described above, the conventional AC generator has the heat radiating portion 13 of the heat pipes A, B 13, and 14.
Since b and 14b are provided on the outer side of the outer peripheral side wall of the housing 1 and the cooling fins 15 are disposed in this portion, there is a problem that the outer diameter becomes large and it is difficult to reduce the size.

The present invention has been made in order to solve the above problems, and by providing a heat radiating portion by a heat pipe adjacent to the generator body in the axial direction, no space is required in the radial direction. Aim to get a generator.

[0006]

According to a first aspect of the present invention, there is provided a vehicle AC generator in which a heat radiating portion formed by a heat pipe is provided adjacent to an axial direction of the generator main body so that a heat generating portion inside the generator main body is provided. The heat is transferred to an external heat radiation part.

In the vehicle alternator according to the second aspect of the present invention, the heat pipe is inserted into the cooling water in the generator body, and this cooling water is used as primary cooling water. The vehicle alternator according to the invention of claim 3 uses engine cooling water for cooling the engine as a cooling medium of the heat radiating portion. In the vehicle alternator according to the invention of claim 4, a flexible part is provided in a part of the heat pipe.

[0008]

According to the present invention, the heat generating portion in the generator body is not directly cooled, but the heat is transferred from the heat generating portion to the outside by the heat pipe and collected in the heat radiating portion to radiate the heat. Further, since the heat dissipation portion is provided adjacent to the generator body in the axial direction, the outer diameter of the generator body does not increase.

[0009]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to FIG.
Will be described. FIG. 1 is a diagram conceptually showing a cooling system. In the figure, the heat generated by operating the generator main body 16 is collected from the respective heat generating portions through the heat pipes 17 to the heat dissipation portion 18 provided adjacent to the generator main body 16. The heat radiating portion 18 may be of a type attached to the generator body 16 or a separate type.

The heat drawn out through the heat pipe 17 is released by water cooling or air cooling in the heat radiating portion 18. When the heat radiating portions 18 are provided adjacent to each other in the axial direction of the generator body 16 in this manner, no space is taken in the radial direction of the generator body 16.

Embodiment 2. Next, an example in which the heat dissipation part 18 is integrally attached to the generator body 16 will be described with reference to FIGS. 2 is a partially cutaway side view, FIG. 3 is an axial sectional view around the armature shown in FIG. 2, and FIG. 4 is a sectional view taken along the axis orthogonal to FIG. Alternatively, the corresponding parts are designated by the same reference numerals and the description thereof is omitted. The housing 1 includes a front bracket 1a and a rear bracket 1b.
It consists of and.

In the figure, 17a, 17b, 17c--
--- is a plurality of heat pipes arranged at appropriate intervals along the outer periphery of the armature core 19, and one end thereof is press-fitted in the front bracket 1a near the armature core 19 in the axial direction. At the other end of the heat pipes 17a and 17b, there is a group of annular thin plate heat radiation fins 2 in the cover 20 of the heat radiation portion 18.
Many 1 are installed. In addition, a large number of thin disk-shaped heat radiation fin groups 22 that radiate heat from the rotor are attached to the other end of the heat pipe 17c. This heat pipe 17
c has a hollow and hermetically sealed shape so that it can be shared with the rotor rotary shaft, and is formed as a rotary shaft having a function of a heat pipe. The thin disk-shaped radiation fin group 22 rotates together with the rotor during operation, while the annular thin plate radiation fin group 21 remains fixed.

From inside the generator body 16 to the heat pipe 17
The heat taken out by a, 17b, 17c --- is released from each of the radiation fins 21 and 22. In this case, the outside air is forcedly fed into the inside of the heat radiation portion 18 by an electric fan or the like (not shown). If so, it can be cooled effectively.

Further, if the operation of the electric fan is controlled while the temperature of each is monitored by the temperature sensor installed in the armature coil in the generator body 16, the rectifier, the voltage regulator, etc., it is further effective. A highly efficient cooling system can be realized.

Example 3. In the second embodiment, the heat pipe 17a is press-fitted into the front bracket 1a and the heat generated from the armature body 16 is transferred to the heat pipe 17a through the front bracket 1a.
When the heat pipe 17a is directly press-fitted into the armature core 19 as shown in, heat can be more efficiently extracted to the heat pipe 17a.

Example 4. Next, another embodiment of the present invention will be described with reference to FIG. FIG. 6 is a sectional view in the axial direction, in which the same or corresponding parts as those of the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, 23 is a voltage regulator heat sink plate, 24 is a rectifier heat sink plate, 25 is a stator fixed with a resin 26 having good thermal conductivity, 27 is a stator 25, a front bracket 1a, and a rear bracket 1b.
The heat pipes 17a, 17b, 17c, which are inserted from the rear side in the cooling water filled in the space surrounded by the heat sink plates 23, 24, are installed therein.

According to this method, the cooling water 27 in the main body of the generator is used as primary cooling water, and the heat due to the heat generation raises the water temperature of the cooling water 27, so that the heat pipes 17a, 17b, 17c-- --- is transmitted. In this embodiment, it is possible to avoid a local temperature rise in the heat generating portion in the generator body and make the temperature distribution in the generator body uniform. Also, the heat pipes 17a, 17b, 1
By changing the working fluid and the pipe internal pressure inside 7c ---, the temperature inside the generator main body can be arbitrarily set.

Example 5. Next, another embodiment of the present invention will be described with reference to FIG. FIG. 7 is a block diagram showing the whole, and the same or corresponding parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, 28 is an engine, 2
Reference numeral 9 is a cooling radiator for the engine 28, and 30 is a flexible hose for connecting the engine 28 and the radiator 29.

By cooling and radiating the heat radiating portion 18 with the engine cooling water for cooling the engine 28 in this manner, a local temperature distribution of the heat radiating portion 18 can be avoided, and the heat radiating portion 18 can be prevented from being generated. Even if they are provided adjacent to each other in the axial direction, the temperature distribution in the generator body 16 can be made uniform.

Example 6. If the heat pipe 17 in each of the above embodiments is a heat pipe 31 made of a vacuum tube having a flexible structure as shown in FIG. 8, the heat pipe 31 can be easily arranged. As shown in the figure, when the engine cooling water is taken in, it can be performed very efficiently. The heat pipe 31
8 is a flexible heat insulating portion 31a and a heat absorbing portion 31 to be inserted into the armature core 19 (FIG. 5), for example.
b and the heat dissipation portion 31 that is inserted into the heat dissipation portion 18 and cooled.
and the steam flow in the direction indicated by arrow 32.

[0021]

As described above, according to the first aspect of the present invention, the wind noise from the conventional cooling fan is provided by dividing the generator main body having no cooling fan and the heat radiating portion into the heat pipe. In addition, it is possible to realize a generator that makes the best use of the performance of the heat pipe, and by providing the heat radiating portion adjacent to the axial direction of the generator main body, it is possible to obtain an effect that no space is taken in the radial direction.

Further, according to the invention of claim 2, by utilizing the cooling water in the generator body as the primary cooling water, it is possible to avoid a local temperature rise in the heat generating portion in the generator body, and The effect is that the temperature distribution of can be made uniform.

According to the third aspect of the present invention, the engine cooling water for cooling the engine is used to cool and dissipate the heat radiating portion, so that a local temperature rise of the heat radiating portion can be avoided and the heat radiating portion can generate electricity. Even if it is provided adjacent to the machine body in the axial direction, the effect that the temperature distribution in the generator body can be made uniform can be obtained.

Further, according to the invention of claim 4, the flexible construction of the heat pipe has an effect that the heat pipe can be easily arranged and, particularly, when the engine cooling water is taken in, it can be extremely efficiently performed. .

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a cooling system showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing a second embodiment of the present invention.

3 is an axial cross-sectional view showing an example of press-fitting of a heat pipe evaporator of FIG.

FIG. 4 is a sectional view taken along the direction orthogonal to the axis of FIG.

FIG. 5 is a cross-sectional view of essential parts showing Embodiment 3 of the present invention.

FIG. 6 is an axial sectional view showing Embodiment 4 of the present invention.

FIG. 7 is an overall configuration diagram showing a fifth embodiment of the present invention.

FIG. 8 is a structural view of a heat pipe showing a sixth embodiment of the present invention.

FIG. 9 is an axial sectional view showing a conventional AC generator.

[Explanation of symbols]

 1a Front bracket 1b Rear bracket 16 Generator body 17,31 Heat pipe 17a, 17b, 17c Heat pipe 31a Flexible part 18 Radiating part 19 Armature iron core 25 Stator 26 Resin 27 Cooling water 28 Engine 29 Radiator

Claims (4)

[Claims] 1. A generator main body having a bracket for rotatably supporting a rotor, an armature core fixed to the bracket, and an armature coil wound around the armature core, and the generator main body. And a heat pipe whose one end is attached to the armature core or a bracket near the armature core and the other end which is pulled out in the axial direction is attached to the heat dissipation unit. An alternator for vehicles, which is characterized by 2. A bracket for rotatably supporting a rotor, a stator fixed to the bracket and hardened with a resin having good thermal conductivity, and a space surrounded by the stator and the bracket. A main body of the generator having cooling water, a heat radiating portion provided adjacent to the main body in the axial direction, and one end inserted into the cooling water and the other end being pulled out in the axial direction radiating the heat. An alternator for vehicles, characterized by comprising a heat pipe attached to the section. 3. The vehicle alternator according to claim 1 or 2, wherein the heat radiating portion is configured to radiate heat by engine cooling water for cooling the engine. 4. The vehicle alternator according to claim 1, wherein a part of the heat pipe is flexible so that the heat pipe can be bent.