JPH11146606A - Water-cooled alternator - Google Patents

Abstract

(57) [Object] To provide a water-cooled alternator having a small diameter for cooling a stator coil and having good productivity, assemblability, and liquid tightness. A cooling pipe (13) through which cooling water flows to cool a stator coil (7) and remove heat of a rectifier (11) and a voltage regulator (12) via a bracket is provided on a rear bracket (4) and a stator coil (7).
And between the coils in the coil end portion and between the coils and the cooling pipe are integrally molded with a highly conductive resin material 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an alternator mounted on a vehicle.

[0002]

2. Description of the Related Art An alternator includes a rotor fixed to a rotating shaft that is rotated by an engine of a vehicle, a substantially cylindrical stator around which a stator coil is wound. A front bracket and a rear bracket that support the stator directly or via a member, and that support the rotating shaft via a bearing, and a voltage regulator that adjusts an excitation voltage to adjust a power generation amount; It is composed of a rectifier that converts an induced AC voltage to a DC voltage into a stator coil.

[0003] When the excited rotor rotates in the stator coil by the driving force of the engine, an induced electromotive force is generated in the stator coil. The induced AC voltage is rectified to DC by a rectifier and supplied to a vehicle and a battery. The excitation voltage of the rotor is adjusted by a voltage regulator by monitoring the voltage of the battery.

Since current flows through the stator coil, voltage regulator, and rectifier during power generation, heat is generated by the resistance of elements of the stator coil, voltage regulator, and rectifier. When heat is generated, the resistance of each element further increases, and further heat is generated. To remove this heat generation, it is necessary to improve the cooling performance.

[0005] As a method of improving the cooling of the alternator for a vehicle, an air cooling technique using a fan is generally used. However, in recent years, a water cooling system using cooling water has been seen in order to further improve the cooling performance. As a prior art of a water-cooled alternator, as shown in Japanese Patent Publication No. 4-67429, the end of the stator coil is surrounded by a metal enclosure via an insulating filler such as synthetic resin, and the back of the enclosure is A flow path is formed in the circumferential direction between the inner wall of the front and rear brackets, and cooling water flows through the flow path to cool the stator coil. At the outer end of the rear bracket is provided a cooling cover to which a rectifier and a voltage regulator are attached in contact. Then, the cooling water is branched to cool the rectifier and the voltage regulator.

[0006]

In the above prior art,
The main flow path formed by the bracket and the metal enclosure,
Since it is formed on the outer periphery of the stator of the alternator, there is a problem that the diameter of the alternator itself increases.

Further, since the flow path is composed of two or more different members, there is a problem that the structure of the constituent members is complicated, productivity and assemblability are poor, and it is difficult to maintain liquid tightness. .

In view of the above, an object of the present invention is to provide a water-cooled alternator which is small in diameter and has good productivity, assemblability, and liquid tightness.

[0009]

In a water-cooled alternator according to the present invention, as a first embodiment, a cooling water passage is constituted by a cooling pipe, and the cooling pipe and the stator coil are integrally formed by a good heat conductive material. Molded.

In the second embodiment, a conductive member for transmitting heat generated by the stator coil to the cooling surface of the cooling water flow passage and the stator coil are integrally molded of a good heat conductive material.

[0011]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of a water-cooled alternator according to the present invention.
The following shows an example.

The pulley 1 is driven by a vehicle engine (not shown).
The rotation is transmitted to the rotation shaft 2 via the. The rotating shaft 2 is fixed to the rotor 3, and the rotor 3 rotates together with the rotating shaft 2. The rotor 3 is excited by an exciting coil 5 fixed to the rear bracket 4. A substantially cylindrical stator 6 is arranged so as to surround the rotor 2, and a stator coil 7 is wound thereon.

The stator 6 is directly or indirectly supported by members via a front bracket 8 and a rear bracket 4. The front bracket 8 and the rear bracket 4 support the rotating shaft 2 via bearings 9 and 10. I do. Therefore, the outer periphery of the rotor 3 fixed to the rotating shaft 2 and the inner peripheral surface of the stator 6 can rotate while maintaining a constant gap.
A rectifier 11 and a voltage regulator 12, which are one of the heat generating sources, are mounted on the rear surface of the rear bracket 4.

The stator coil 7 that generates the most heat
Rectifier 11 and voltage regulator 1 via cooling and bracket
A cooling pipe 13 through which cooling water flows to take away the heat of 2 is disposed between the rear bracket 4 and the stator coil 7. In this embodiment, the cooling pipe 13 is formed by spirally shaping a single copper pipe. However, if this cooling pipe 13 is a flow path composed of a combination of a plurality of members, it is a seal for maintaining liquid tightness. This is because the number of parts such as members increases. In addition, a copper tube may be used, as long as it is a tube made of aluminum, stainless steel, or the like and is easy to shape.

In order to better radiate the heat generated in the stator coil 7 to the cooling water flowing through the cooling pipe 13, the contact area between the stator coil 7 and the cooling pipe 13 needs to be as large as possible. However, as shown in FIG.
Is wound around the stator 6, a portion of the stator coil 7 protruding from the stator 6 (hereinafter referred to as a coil end portion) has a shape in which the coil is wound a plurality of times and is not a smooth surface.

Therefore, even if the spirally shaped cooling tube 13 is brought into contact with the coil end as it is, the contact area is
Limited to a very narrow range. Therefore, in the present embodiment, the space between the coils in the coil end portion and the space between the coils and the cooling pipe are integrally molded with a resin material 16 having good conductivity.

By doing so, the resin is also filled between the coils at the coil end portions, and the contact area between the stator coil 7 and the resin increases. The contact area between the cooling pipe 13 and the resin is the area of the outer periphery of the cooling pipe 13. The contact area between the stator coil 7 and the cooling pipe 13 is determined by the surface area of the portion where the stator coil 7 is molded with the resin and the cooling pipe. 13 has a larger outer peripheral area.

The manufacturing procedure of this embodiment is shown in the flowchart of FIG. 3 and will be described below.

The stator coil 7 is wound around the stator 6.

The cooling pipe 13 is formed into a spiral shape.

The coil end portion is bent and shaped in the radial direction.

The coil end portion of the stator coil 7 and the spirally shaped cooling pipe 13 are temporarily fixed, and integrated by molding.

After the rear bracket 4 is assembled, the cooling pipe 13
, And attach the joint for the cooling water inlet / outlet.

In this embodiment, the stator coil 7, the rectifier 11, and the voltage regulator 12 are cooled by a single cooling pipe with a single cooling water passage. However, as shown in FIG. Cooling water through a plurality of flow paths (front coil end cooling pipes 13a,
Rear coil end cooling pipe 13b, electronic component cooling pipe 13c
Etc.), and each of them may be cooled. However, in this case, it is necessary to adjust the pressure loss and attach the flow rate control valve 17 and the like so that the flow rate of the cooling water in each flow path at the time of design flows.

Next, a second embodiment of the present invention is shown in FIG.

In this embodiment, instead of the cooling pipe 13 shown in the first embodiment, a conductive member 18 for transmitting heat to a cooling surface is used.
Is molded integrally with the stator coil 7.
Since the cooling water flow path 19 is not constituted by a cooling pipe as in the first embodiment, liquid tightness must be taken into consideration.
Stator coil 7 and electric heating member 18 which are sources of maximum heat
Is made of resin having good heat conductivity, a large contact area between the stator coil 7 and the heat transfer member can be ensured, and a smooth contact with the cooling surface can be achieved. Can tell to the water. By adopting such a configuration, assemblability and productivity can be improved.

Although the above embodiment describes a brushless alternator, the structure of the stator and the stator coil is the same in a general brushed alternator, so that the present invention is also applied to a brushed alternator. it can.

[0029]

By adopting the structure as in the embodiment of the present invention described above, it is possible to provide a water-cooled alternator having a small diameter and good productivity, assemblability and liquid tightness.

[Brief description of the drawings]

FIG. 1 is a structural view of a water-cooled alternator according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a winding state of a stator and a stator coil of FIG. 1;

FIG. 3 is a manufacturing flowchart according to the first embodiment of the present invention.

FIG. 4 is a structural view of a water-cooled alternator having a plurality of flow paths in the first embodiment of the present invention.

FIG. 5 is a structural view of a water-cooled alternator according to a second embodiment of the present invention.

[Explanation of symbols]

2 ... pulley, 3 ... rotor, 4 ... rear bracket, 6 ... stator, 7 ... stator coil, 11 ... rectifier, 12 ... voltage regulator, 13 ... cooling pipe, 19 ... cooling water flow path.

Claims (2)

[Claims] A rotor fixed to a rotating shaft that is rotated by an engine of a vehicle and excited by an excitation coil, and a substantially cylindrical fixed member arranged to surround the rotor and wound with a stator coil. And a front bracket and a rear bracket that support the rotating shaft via a bearing, while supporting the stator directly or via a member, and a water cooling system including a cooling water flow path for cooling the stator coil. A water-cooled alternator, wherein the cooling water flow path is constituted by a cooling pipe, and the cooling pipe and the stator coil are integrally molded with a good heat conductive material. 2. A substantially cylindrical fixed member fixed to a rotating shaft rotated by an engine of a vehicle and excited by an exciting coil, and a stator coil disposed around the rotor and wound with a stator coil. A front bracket and a rear bracket that support the rotating shaft via a bearing while supporting the stator directly or via a member, a cooling water flow path for cooling the stator coil, and a stator. In a water-cooled alternator provided with a conductive member that conducts heat generated by a coil to a cooling surface of a cooling water channel, the conductive member and the stator coil are integrally molded with a good heat conductive material. Water-cooled alternator.