JPS62178139A - Cooler for generator for car - Google Patents

Abstract

PURPOSE:To miniaturize a device and lighten the weight, by enclosing the both coil ends of a stator coil with a metallic enclosing unit via an insulating filler, to pass cooling liquid through a passage, and by fitting fans on the both sides of a rotor. CONSTITUTION:A generator for a car is organized with a rotary shaft 1, magnetic pole cores 4-5, a stator core 10, brackets 33-34, and the like. The cooler of the generator is organized so that a pair of enclosing units 31 for enclosing the both coil ends of a stator coil 11 may be fixed liquid-tight on the stator core 10 by filling up spaces between the units 31 and the coil ends with insulating fillers, and so that the units 31 may be provided with the passages 35-36 of cooling liquid in the circumferential direction of a space between the units 31 and the rear surface. On the magnetic pole cores 4-5 of a rotor 3, fans 7-8 are fitted. By this organization, the rotor 3 and the stator coil 11 are cooled with cooling air in the brackets 33-34 due to the fans 7-8 on the both sides, and the cooling liquid is passed through the passages 35-36 to cool the back surface of the stator coil 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling device for a vehicle generator driven by an engine of a vehicle such as an automobile.

[Conventional technology]

FIGS. 4 and 5 are a longitudinal sectional view and a front sectional view showing a conventional cooling device for a vehicle generator disclosed in, for example, Japanese Unexamined Patent Publication No. 59-83557. In the figure, l is a rotating shaft to which a pulley 2 is fixed.

3 is a rotor fixed to the rotating shaft 1, and is configured as follows. 4 is one magnetic pole iron core, and a plurality of magnetic pole claw parts 4a
-15 is the other magnetic pole iron core which is extended at intervals in the circumferential direction, and a plurality of magnetic pole claw portions 5a are extended in the circumferential direction alternately with the magnetic pole claw portions 4a. 6 is an excitation coil held between both magnetic pole iron cores 4.5.

7 and 8 ViEIl! +Fan attached to the pole iron cores 4 and 5; 10 is a stator core; 012 holds the stator coil 11 in a slot; 012 supports the rotating shaft 1 via a bearing 14; The supporting front bracket is provided with an inlet hole 12a and an outlet hole 12b for cooling air. 13 Front bracket 12 via ViOIJ ring 20
The rear bracket is liquid-tightly coupled to the rear bracket, supports the rotating shaft 1 via a bearing 15, and also supports the stator core 10, and is provided with an inlet hole 13a and an outlet hole 131) for cooling air. . A cooling fluid flow passage 16 in the circumferential direction is formed concentrically with the stator iron core lO in the walls of both the front bracket 12 and the rear bracket 13.
Reference numeral 19, which communicates with the inflow pipe 17 and the outflow pipe 18 provided in the front bracket 2, is a heat radiation fin provided on the front bracket 12 so as to protrude into the flow passage 16. Reference numeral 21 is a slip ring for supplying DC current to the excitation coil 6, and the current is collected by a brush device (not shown). Reference numeral 22 is a rectifier that rectifies the AC power from the stator coil 1o into DC.
Reference numeral 4 denotes a tube that is branched from the outgoing path of the coolant circulation system of the vehicle engine and connects the inflow pipe 17, and a tube that connects the incoming path and the outflow pipe. The rotating shaft 1 is rotated,
AC voltage is generated in the stator coil 10, rectified into DC by a rectifier 21, the AC voltage is adjusted to a predetermined value by a voltage regulator (not shown) K, and DC power is supplied to the excitation coil 6 and loads such as storage batteries. Ru.

The heat generated by each of these electrical components is cooled by the circulation of cooling air by the fan 7.8, and furthermore, by the cooling liquid flowing through the flow path 16, the stator core 9 is [Problem to be Solved by the Invention] In the conventional vehicle generator cooling device as described above, the cooling air generated by the fan 7.8 is The stator coil 11, which generates the largest amount of heat, is cooled by heat transfer from the stator core 10, but there is an insulator and a gap between the inner wall of the slot and the heat transfer is not sufficient. However, there was a problem in that the liquid cooling was not fully utilized. Besides, before.

Since the flow passage 16 is formed within the walls of the rear platen 12 and 13, there is a problem in that the outer diameter becomes large, which hinders miniaturization.This invention was made to solve this problem. The present invention aims to provide a cooling device for a vehicle generator that effectively cools the stator coil end from the back side, does not increase the outer diameter of the bracket, and can be made smaller and lighter.

[Means for solving problems]

The cooling device for a vehicle generator according to the present invention surrounds the coil end of the stator coil with a metal enclosure via an insulating filler, and creates a circumferential flow path between the inner walls of the front bracket and the rear bracket. The rotor core has a fan installed at both ends of the rotor core to allow cooling air to flow through both brackets.

[Effect]

The stator coil is effectively cooled from the back side by the cooling liquid flowing through the flow path through the enclosure with good heat transfer, and furthermore,
The rotor section and stator section will be cooled by the circulation of cooling air by the internal fan. [Embodiment] Fig. 1 is a longitudinal cross-sectional view showing an example of a cooling system for a vehicle generator according to the present invention. FIG. 2 is a front sectional view showing the apparatus of FIG.

11. 14, 15, 17, 18, 21. 22 are the same as the conventional device described above. 31 is a pair of integral enclosures surrounding both coil ends of the stator coil 11, and is made of aluminum or the like with good thermal conductivity. 031b is made of a metal material and is filled with an insulating filler 32 made of synthetic resin or the like between the ends of the coil, and is fixed to the stator core lO in a liquid-tight manner to protect the stator coil 11 in a liquid-tight manner. are a plurality of heat dissipating wines provided on the back surface of the enclosure 31 in the circumferential direction.

Next, in the front bracket supporting the 33-piece stator core 10, the annular groove 33a and the cylindrical protrusion 31 at the end of the K enclosure 31 are
Insert a into the viscous silicone gasket 37
It is liquid-tightly sealed. A circumferential flow passage 35 is formed between the inner wall of the front bracket 33 and the back surface of the enclosure 31 and communicates with the inflow pipe 17 and the outflow pipe 18, and the inflow pipe 17 and the outflow pipe 18 are in the open position. A partition part 331) is provided between the back of both enclosures 31.3 Also, the front bracket) 31 has a cooling air intake hole 33c and an outlet hole 33.
d is provided.

34 is a rear bracket liquid-tightly connected to the front bracket 33 via an O-ring 38, and a body 240 surrounded by an annular groove 34a.
The cylindrical projection 31a is fitted into the viscous gasket 37.
The rear bracket 34, which is liquid-tightly sealed, is provided with an inlet hole 34c and an outlet hole 34 (l) for cooling air. A flow path 36 in the direction is formed and communicates with the inflow pipe 17 and the outflow pipe 18.
A partition (not shown) is provided between the opening position and the back surface of the enclosure 24.

39, it is attached to the bracket 34 and the bearing 15 is attached. f
A cooling air inlet hole 42a is provided on the rear bracket 34 with a protective cover having a &f dimension. Both inflow pipes 17 are connected to tubes 41 from the outgoing route of the engine's coolant circulation system, and both outflow pipes 18 are connected to tubes 42 to the return route of the engine's coolant circulation system. ) The cooling effect of the device of the above embodiment is as follows: Front and rear brackets 33.3 by fans 7.8 on both sides.
The rotor 3 and stator coil 11 are cooled by the cooling air flowing through the rotor 4 . The cooling liquid flowing in from the inflow pipe 17 flows through the flow passages 35 and 36 as shown by the arrows, cools the end portion of the stator coil 11 from the back side, and flows out from the outflow pipe 18. In the embodiment shown in FIG. Front and rear brackets 33 and 34
Flow passages 35 and 36 are formed in the inflow pipe 17, respectively.
Although the flow passages 35 and 36 of the front bracket 33 and the rear bracket 34 are bulged outward, as in the other embodiment shown in FIG. It is also possible to provide one common inflow pipe (not shown) that communicates with the two, and bulge the outflow part outward, and provide one common outflow pipe 18 that communicates with the two in the axial direction. Furthermore, either the inflow pipe or the outflow pipe 18 may be provided separately on the front bracket 33 and the rear bracket 34.

In the above embodiment, the excitation coil 6 is held in the rotor magnetic pole core and is energized via the slip ring 21. However, the excitation coil 6 is held in the fixed excitation side iron core fixed to the bracket, and and brush device 4
In addition, in the above embodiment, a portion of the coolant was flowed from the coolant circulation path of the engine to the generator, but the present invention is not limited to this.
A separate system of cooling liquid circulation means may be provided.

〔Effect of the invention〕

According to the present invention, both coil ends of the stator coil are surrounded by metal enclosures with an insulating filler interposed therebetween, and metal enclosures are formed between the inner walls of the front and rear brackets and the back surfaces of both enclosures. Cooling fluid was distributed through the circumferential flow passages, fans were installed on both sides of the rotor's magnetic pole core, and cooling air was circulated within both brackets. 18 Large stator coils are effectively cooled, and even with liquid cooling, the outer diameter of the bracket does not increase, making it smaller and lighter.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a cooling device for a vehicle generator according to the present invention, FIG. 2 is a front sectional view of the device shown in FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a side view showing a conventional cooling device for a vehicle generator, with the upper half taken in section, and FIG. 5 is a front sectional view of the device shown in FIG. 4. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 3... Rotor, 4, 5... Magnetic pole iron core, 6... Excitation coil, 7.8... Fan, 10...
...Stator core, 11...Stator coil, 31...
Enclosure body, 32... Insulating filler, 33... Front bracket, 33a... Annular groove, 34... Rear bracket,
3411L...Annular groove, 35.36...Flow passage Note that the same reference numerals in the figures indicate the same or equivalent parts] No.
゛4 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) A rotor magnetic pole core that is fixed to the rotating shaft rotated by the vehicle engine and excited by an excitation coil, a stator core that surrounds this pole core and has a stator coil attached to it, and supports this stator core. and a front bracket and a rear bracket that support the rotating shaft through bearings, respectively;
In a cooling system for a vehicle generator, which is provided with a pair of fans that are attached to both sides of the magnetic pole core and that ventilate the inside of the front bracket and the inside of the rear bracket, both coil ends of the stator coil are cooled with liquid. A pair of closely insulated and enclosing enclosures on each side, the inner portion of which is fluid-tightly connected to the outer end of one of the enclosures, with a cooling liquid flowing circumferentially between the inner wall and the rear surface of the enclosure. a front bracket having a flow path formed therein; and a front bracket liquid-tightly coupled to the outer end of the other enclosure at the inner side, and a circumferential coolant flow path being formed between the inner wall and the enclosure. A cooling system for a vehicle generator equipped with a rear bracket. (2) A cooling device for a vehicle generator according to claim 1, wherein a part of the coolant is diverted from the coolant circulation path of the engine and distributed to the flow path. (3) A cooling device for a vehicle generator as set forth in claim 1 or 2, wherein heat dissipation fins are provided on the back surface of the enclosure.