JPS6318943A - Cooling construction for vehicular generator - Google Patents

Abstract

PURPOSE:To efficiently cool a generator, by forming an air passage between a stator coil fitting base and an engine case, and by setting a conductive duct separate from the fitting base. CONSTITUTION:When a rotor 18 is rotated together with a crank shaft 16, a current is generated and flows through a stator coil 20. Heat generated by the current is conducted to a stator coil fitting base 24. An air stream received by a running vehicle is admitted through both a conductive duct 29 formed separated from the stator coil fitting base 24 and an opening 32 to the rear side along an air passage 34, and flows out of the opening 32. Then, by the air stream circulated through the air passage 34, the stator coil fitting base 24 is cooled.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applied to a vehicle in which a rotor attached to an engine output shaft and a stator coil arranged opposite to the rotor are housed in a generator cover. Regarding the cooling structure of the generator.

<Prior Art> When a vehicle generator, particularly its stator coil, overheats, the generator output decreases, which may lead to dielectric breakdown of the coil winding. In order to prevent this, cooling structures have been considered. One method is to fix the stator coil iron core to the engine case and release the heat generated in the stake coil to the engine case using the thermal gradient between the iron core side and the engine case. There are some that are designed to cool down.

<Problems to be Solved by the Invention> With such a conventional structure, a considerable cooling effect can be obtained when the engine case is relatively low temperature and the thermal gradient is large, but as the engine operates, the engine case cools considerably. When the temperature becomes high and the thermal gradient becomes small,
There is a major problem in that the heat generated by the hestita coil on the engine case side cannot escape, making it impossible to obtain a sufficient cooling effect.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooling structure for a vehicle generator that can efficiently cool the vehicle generator.

<Means for Solving the Problems> In order to achieve the above object, the present invention has a mounting base of a stake coil fixed to an engine case, and a gap between the mounting surfaces between the engine case and the mounting base. teeth,
A special feature of the cooling structure is that an air passage is formed to introduce wind from the vehicle running between its mounting surfaces, and an air guide duct separate from the mounting base is provided to guide the wind from the vehicle to the air passage. .

Effects> When the vehicle is running, the wind from the vehicle is guided by the wind guide duct and introduced into the air passage, and the stator coil mounting base is air-cooled. As a result, the thermal gradient between the stator coil and the stator coil mounting space increases, and the generator is efficiently cooled.

<Example> An example of the present invention will be described below with reference to FIGS. 1 to 3.

In these figures, 2 is a front wheel, 4 is a rear wheel, 6 is a frame, 8 is an engine, and IO is an engine case, for example, a crankcase.

A generator 12 is attached to the crankcase 10.

In the generator 12, for example, as the engine output shaft,
A rotor 18 attached to the crankshaft 16, and a stator coil 2 disposed opposite to the rotor]8.
0 is housed within the generator cover 14.

The crankcase 10 includes an iron core 2 of a stator coil 20.
A stator coil mounting base 24 to which the stator coil 2 is mounted is fixed. The stator coil mounting base 24 has a cylindrical shape with a bottom, and has an opening 26 at the center of its bottom surface for leading out one end of the crankshaft 16. This opening 2
An iron core 22 is fixed to the thick portion around 6 with bolts 28. On the other hand, the periphery of the bottom of the stator coil mounting base 24 bulges toward the crankcase 10 side, and a notch is formed along the periphery. By attaching the stator coil mounting base 24 to the crankcase 10 with the bolts 30, a plurality of openings 32 are formed between the mounting surfaces between the stator coil mounting base 24 and the crankcase 10, and these are connected to each other. An air passage 34 communicating therewith is formed.

On the other hand, the rotor 18 has a plurality of permanent magnets 38 fixed to the inner circumferential surface of the flywheel 36, and is fixed to the tip of the crankshaft 16 with a bolt 40 with its open end facing the stake coil mounting base 24. ing.

In this state, the permanent magnet 38 is connected to the stator coil 2
It is arranged opposite to the iron core 22 of No. 0. Then rotor 1
From above 8, the generator cover 14 is fixed to the stator coil mounting base 2□t by bolts 42.

Incidentally, on the side of the stator coil mounting base 24 in the vehicle running direction, there is provided a 4-hole guide which guides running wind and introduces it into the air passage 34.
There is a wind duct 29. The wind guide duct 29 is made of metal or synthetic resin, and has a generally U-shaped cross section, and this cross section widens in the direction of vehicle travel. The wind guide duct 29 connects its both ends to the frame 6.
It is fixed by screwing it into place. At this time, it is desirable to provide a slight gap between the air guide duct 29 and the stator coil mounting base 24 in order to prevent noise generation due to transmission of engine vibrations to the air guide duct 29.

Next, the operation of the embodiment having the above-described configuration will be explained.

When the rotor 18 rotates together with the crankshaft 16, a generated current flows through the stake coil 20. The heat generated by this is mainly transferred to the stator coil mounting base 2.
Conducted to 4. On the other hand, as the motorcycle travels, the opening 3 is guided by the wind guide duct 29 and reaches the front in the traveling direction.
The running wind introduced from 2 flows rearward along the air passage 34 and flows out from the opening 32 at the rear in the running direction.

At this time, the stator coil mounting base 24 is air-cooled by the traveling wind flowing through the air passage 34.

In addition, in the above-mentioned embodiment, the stator coil mounting base 2
A plurality of openings 32 are provided between the mounting surfaces of 4 and the crankcase 10.
However, the opening 32 is not necessarily required as long as the air passage 34 can introduce the traveling wind, and for example, the opening 32 may be formed so as to open the entire area between the mounting surfaces.

Furthermore, if heat dissipation fins are formed along the flow of running wind on the bottom surface of the stator coil mounting base 24 facing the air passage 34 or on the surface of the generator cover 14, the heat dissipation area will be expanded, and the cooling effect of the generator will be further improved. Preferable for improving.

Furthermore, in the above embodiment, the case where the generator 12 is attached to the crankcase 10 has been explained as an example, but since the rotational force of the loco is also given by the shaft of the minonyon, etc., the generator is attached to the transmission case, for example. It may also be something that can be attached to.

Furthermore, in the description of the embodiment, the wind guide duct 29 is formed independently, but it may be formed as long as it can guide the running wind to the air passage 34, so it may be formed integrally with, for example, a radiator cover or a fairing. It may be something that

<Effects of the Invention> As is clear from the above description, the cooling structure for a vehicle generator according to the present invention forms an air passage through which running wind flows between the stator coil mounting base and the engine case. At the same time, a wind guide duct separate from the mounting base is provided to guide the traveling wind to the air passage. Therefore, according to the present invention, a larger amount of traveling wind can be introduced into the air passage than in the case where no air guide duct is provided, and the air flow speed in the air passage becomes faster. As a result, the stator coil mounting base is sufficiently air-cooled. Therefore, the thermal gradient between the stator coil and the stator coil mounting base increases,
The generator can be efficiently cooled. As a result, according to the present invention, when obtaining the same power generation output as a conventional generator, the generator can be made smaller than the conventional generator.

Furthermore, since the air guide duct is formed separately from the stator coil mounting base, the following effects are also achieved. That is, there are fewer restrictions on the installation space for the electric motor, and the air guide duct can be easily enlarged. In addition, if necessary, by forming the four-wind duct with a material that absorbs vibrations, it is possible to suppress the vibrations transmitted from the engine case etc. to the air guide duct, thereby reducing the noise generated by the vibration of the air guide duct. It is also possible to do so.

[Brief explanation of the drawing]

FIG. 1 is a side view of a motorcycle equipped with a cooling structure for a vehicle generator according to an embodiment of the present invention, FIG. 2 is an enlarged external perspective view of the periphery of the vehicle generator, and FIG. FIG. 3 is a longitudinal sectional view of the vehicle generator according to the embodiment. 12... Generator, 14... Generator cover, 16...
・Crankshaft, 18...Rotor, 20...
Stator coil, 22... Iron core, 24... Stator coil mounting base, 29... Wind guide duct, 34...
air passage. Patent applicant Yamaha Motor Co., Ltd. Agent Patent attorney Oka 1) Hide Kazu Figure 1 Figure 3 Figure 2

Claims (1)

[Claims] (1) A mounting base fixed to the engine case,
A stator coil fixed to the mounting base, a rotor attached to an engine output shaft extending from the center of the mounting base, and a generator mounted to the mounting base so as to cover the stator coil and the rotor. A cooling structure for a vehicle generator including a cover, wherein an air passage is formed between the mounting surfaces of the engine case and the mounting base to introduce vehicle running wind between the mounting surfaces. A cooling structure for a vehicle generator, characterized in that a wind guide duct separate from the mounting base is provided to guide vehicle running wind into the air passage.