JPS62217838A - Ac generator for rolling stock - Google Patents

Abstract

PURPOSE:To miniaturize a unit and to make the weight light, by covering both coil ends of a stator coil and a lead-out terminal led out of one of the coil ends with an insulating material, by forming a flow passage between the inner wall of front and rear brackets and the back of this member, by forming a branch flow passage between the rear bracket and a cooling cover fitted to it and by delivering the coolant through the passages. CONSTITUTION:Pole clicks 22a and 7a alternately jut out to a pole core 22 fixed to a rotating shaft 1 in a rotor 21. An insulating resin member 25 protects both coil ends of a fixed coil 1 and the coil 11 to cover coil lead-out terminals fluid-tightly and a radiating fin 25b is provided. An iron core 10 is supported by a front bracket 26. A flow passage 32a is formed between the front bracket inner wall and a member 25, for which an incurrent pipe 28 and an excurrent pipe 29 are provided. A rear bracket 30 is coupled with the bracket 26. Between the inner wall of the rear bracket 30 and the back of an enclosure in the rear a flow passage 32b is formed and a screen 30b is provided. A branch flow passage 32c is formed between the rear bracket 30 and a cooling cover 33, through which the coolant is delivered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicular alternator driven by an engine of a vehicle such as an automobile, and particularly relates to improvement of cooling.

[Conventional technology]

A conventional vehicular alternator has a cross-sectional view shown in FIG. 1 is a rotating shaft to which a pulley 2 is fixed. Reference numeral 3 denotes a rotor fixed to the rotating shaft l, and is constructed as follows. 4 is the rotor core, 5 is one of the magnetic pole cores,
A plurality of magnetic pole claw portions 5a are provided at intervals in the circumferential direction. 6 is a non-magnetic support ring fixed to the inner periphery of the magnetic pole claw part 5a, 7 is the other magnetic pole iron core fixed to this support ring 6, and the plurality of magnetic pole claw parts 7a are spaced apart from each other in the 1:[18 direction. The magnetic pole claw portions 5a and the magnetic pole claw portions 5a are exposed alternately.

Reference numeral 8 denotes a fixed excitation side iron core disposed with a near gap between the rotor core 4 and the other magnetic pole iron 7, 9 an excitation coil held in this iron core 8, lO a stator core, and a stator in a slot. It holds the coil 11. ll& is a lead-out terminal led out from the stator coil 11 and will be described later! j: Connected to the flow device 16. 12 is a rotating shaft l via a bearing 14
A cooling air outlet hole 12a is provided in the front placket that supports the stator core lO and also connects and supports the stator core lO. 13
1. Connect the stator core toe with the rear bracket that supports it. l
One rotating shaft is supported via an IT receiver 15, one iron core 8 is fixedly supported, and an inlet hole 113a for cooling air is provided. 16 is a rectifier that converts the AC power generated by the stator coil 11 into 1 current electric power;
It is connected to the lead-out terminal 11a of No. 1. 17 is a voltage regulator that detects the generator voltage, controls the excitation current, and adjusts the terminal voltage to a predetermined value; and 18 is a fan fixed to the rotor.

In the above-mentioned conventional device, the rotating shaft l is rotated via the belt tracker due to the rotation inside the vehicle. As a result, the AC voltage generated in the stator coil 114 is adjusted to a predetermined value by the voltage regulator 17vc, and the rectified one-page current is energized to the excitation coil 9 and supplied to a load such as a storage battery.

On the other hand, as the fan 18 rotates, cooling air is sucked in from the inlet hole 18a of the rear placket 18, cools the inside of the machine, is drawn out from the outlet hole 1jlta of the front placket 12, and is discharged by the fan 18.

[Problem that the invention seeks to solve]

In the conventional vehicle DC generator as mentioned above, 7 amps and 18
The cooling effect is insufficient, the fan 18 is large and noisy, and there are problems in that the insulation deteriorates due to the ventilation of outside air.

Furthermore, in the case of increased number of fans, fan 1
8 becomes even larger, leading to an increase in windage loss and an increase in noise.

This invention was made to solve these problems, and it is an AC power generator for vehicles that uses a highly effective cooling means without relying on ventilation cooling by a fan, is smaller and lighter, and eliminates the loss and noise caused by the fan. The purpose is to obtain an opportunity.

[Failure to solve the problem]

The vehicular alternator according to the present invention has a stator coil end and a lead-out terminal of this coil.
-, kn, LL H$ L, L+:
hh-r, b If Wi + -> M
A flow path is formed in the circumferential direction between the back of the coil end covered with RW tr, R + and the inner wall of the front and rear brackets, allowing the cooling fluid to flow and The stator coil lead-out terminal covered with an insulating resin material is fitted into the bracket in a liquid-tight manner, and a cooling cover is attached to the outer end of the rear bracket to form a branch and flow path between the two to cool the coil. Rectifier and voltage regulator on the outer edge of the cover? It is installed so that the cooling liquid is distributed through branched flow passages.

[Effect]

In this invention, the stator coil and the fixed iron core are effectively cooled by the circulation of the cooling liquid, the rectifier and the voltage regulator are cooled through the cooling cover, and the bearing is cooled by the cooled front and rear brackets. Excitation coil via flowing cabin air or excitation side iron core? The lead-out terminals of the stator coils are covered with insulating resin material, making them water resistant and
It has sufficient insulation resistance and can be reliably held in place on the rear bracket.

〔Example〕

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a vehicle alternator according to the present invention, and FIG. 2 is a partially cutaway front view of FIG. 7a, 9~11.14~
Reference numeral 17 is the same as the conventional device described above. 2) is a rotor, in which a plurality of magnetic pole claws 22h are spaced apart from each other in the circumferential direction on one magnetic pole iron core 22 fixed to the rotating shaft l, and are protruded alternately with the magnetic pole claws 7a. .

Reference numeral 28 denotes a fixed excitation side iron core disposed between the magnetic pole iron cores 22 and 7 on one side and the other through an air gap, and the excitation coil 9
is held. 85C is an insulating resin member made of synthetic resin that covers both coil ends of the stator coil 11 and the lead-out terminal of the coil, and is fixed to the stator core 10 in a liquid-tight manner to protect the stator coil 11 in a liquid-tight manner. ing. A plurality of heat dissipating fins 25 in the circumferential direction are provided on the back surface of the insulating resin member 25.
b is provided. 25c is a lead-out portion of the stator coil 11 including lead-out terminals 11ai11.

Next, 26 is a front bracket that supports the stator core 1G, and the cylindrical protrusion 25akffl at the end of the insulating resin member 25 is inserted into the annular groove 26a, and the bracket is liquid-tightly sealed with a gas grip 27 made of viscous silicone or the like. A coolant flow path 32a is formed in the circumferential direction between the inner wall and the back surface of the insulating resin member.

The front bracket 26 is provided with an inflow pipe 28 and an outflow pipe 29 for cooling liquid, and an insulating resin member 22 is provided in both open positions.
A partition portion 26b is provided between the rear surface of the device and the rear surface of the device. 35
is the inflow pipe 2B from the outbound side of the vehicle's primary coolant circulation system.
A tube 811 connected to is a tube connected to the outflow pipe 29 and returned to the return side of the coolant circulation system. 3
0 is a rear bracket that is liquid-tightly connected to the front bracket 26 through an 0 ring 81', and the cylindrical projection SQa of the insulating resin member 25 is completely inserted into the annular groove 80a, and the viscous gasket 27 seals the rear bracket liquid-tightly. It has stopped. The rear platen) 30 fixes the excitation-side iron core 23 and supports the bearing 15, and is provided with a cooling liquid branch hole 13ac and a return hole 80d. A cooling liquid flow passage 32t is provided in the radial direction between the inner wall of the rear bracket 30 and the back surface of the rear enclosure 24.
) is formed, which is a partition part that separates the inflow side and the outflow side.
80b is provided. 30e has rear bracket 8G
Through the through hole provided in the lead-out portion 2S of the insulating resin member 25
a 'i (inserted, and the through hole 80e and the lead-out part 2
5Q is filled with a viscous gasket 27 for liquid-tight sealing.

Reference numeral 88 denotes a cooling cover made of a metal material with good thermal conductivity and attached to the outer end of the rear bracket 80 in a liquid-tight manner, forming a branch flow path 82c for the coolant between the two, and a branch hole 30c.
The cooling liquid from the return hole 80 (L to the flow path a2
Return to the middle of b. A plurality of radiation fins 3) a are provided on the inner surface of the cooling cover 33 in the direction of flow of the cooling liquid. The rectifier 16 is fixed to the outer end surface of the cooling cover 38 via a heat sink 16ai, and the voltage regulator 17 is fixed to the outer end surface of the cooling cover 38 via a heat sink 17a. 34 is a protective cover attached to the rear bracket 30.

The cooling effect of the device of the above embodiment is as follows. A portion of the low-temperature coolant of the vehicle's engine flows through the inflow pipe 28, flows through the flow passages 32a and 82b as shown by the arrow, cools the stator core 10 and stator coil lli, rises in temperature, and flows out. It flows out from pipe 29 and is returned to the return side of the engine's coolant circulation path.

In addition, a part of the coolant flowing into the flow passage 32t) from the inflow pipe 28 is transferred from the branch hole 30c to the branch flow passage 32c (i7
It flows as shown by the arrow, cools the rectifier 18 and voltage regulator 17 through the cooling cover aalt, and returns to the middle of the flow path 32b.

Furthermore, the front bracket 26 is effectively directly cooled by the cooling fluid, and the rear bracket 30 is endothermically cooled.
is the bearing 15 (i-endothermically cooled, and the excitation side iron core 2
The exciting coil 9 is endothermically cooled through the coil 8.

Each insulating resin member 25vc is provided with a radiation fin 251), and the cooling cover 38 is provided with a radiation fin 38a, thereby increasing heat exchange and further improving the cooling effect.

In this way, the stator coil 11. which generates a large amount of heat. Rectifier 16
%II! The pressure regulator 17 and the excitation coil 9 are effectively cooled, temperature rise is significantly suppressed, and a fan is not required, making it possible to eliminate wind noise and costs. Also,
In this embodiment, the lead-out terminal 1 of the stator coil 11
1a is the insulating resin member 25c and the rear platen is connected through f) 8
Since the lead-out terminal 11a is fluid-tightly fitted into the through-hole 30e of G, the lead-out terminal 11a has sufficient water resistance and insulation resistance.
6 and is securely connected.

Figure WJ8 is a longitudinal sectional view showing another embodiment of the vehicle alternator according to the present invention. The rotor 41 rotates 11111 times
One and the other magnetic pole iron core fixed to the magnetic pole iron core 42 and the other magnetic pole core 42 and 43, and the excitation coil 9 held by these, and a plurality of magnetic poles taken out from the magnetic pole iron core 42. The claw portions 42a and a plurality of magnetic pole claw portions 48a extending from the magnetic pole iron core 48 are arranged alternately. 44 is a slip ring that energizes the excitation coil 9, and a brush device 45
Current is collected by A cooling cover 46 is liquid-tightly attached to the rear bracket 5ovc, forming a branch flow passage 32c, and a rectifier 16 and a voltage regulator 17 are attached to the cooling cover 46. 47 is a protective cover.

26.30 is directly cooled by the cooling liquid and effectively exchanges heat with the internal air. Therefore, the excitation coil 9 can be efficiently radiated heat by the flow of internal air due to the rotation of the rotor 41. can.

In addition, in the above embodiment, a portion of the coolant was flowed from the coolant circulation system 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〕

As described above, according to the present invention, both coil ends of the stator coil and the lead-out terminals led out from one coil end are connected to the inner walls of the front and rear brackets and the back surface of the insulating resin member. The cooling liquid is distributed through a circumferential flow passage formed between the rear bracket and a cooling cover attached to the rear bracket, and a portion of the cooling liquid is branched and distributed through a branch flow passage formed between the rear bracket and a cooling cover attached to the rear bracket. Since a rectifier and a voltage regulator are attached to the outer end surface of this cooling cover, the heat generating part is effectively cooled.
It is smaller and lighter, eliminates the noise and wind damage caused by ventilation, and the stator coil lead-out terminal is fluid-tightly inserted into the rear bracket via an insulating resin member, making the lead-out terminal water resistant. It has sufficient insulation resistance, is securely held in position by the rear bracket, and is fully closed, which prevents deterioration of insulation due to outside air and damage from harmful gases and salt damage.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a vehicle alternator according to the present invention;
Fig. 2 is a partially cutaway front view of the device shown in Fig. 1, excluding the protective cover; Fig. 3 is a vertical sectional view of a vehicle AC generator showing another embodiment of the invention; Fig. 4; 1 is a longitudinal cross-sectional view of a conventional vehicular alternator. l... Rotating shaft, 7... Magnetic pole core, 9... Excitation coil, 10... Stator core, 11... Stator coil,
lla... Output terminal, 14, 15... Bearing, 16.
... Rectifier, 17 ... Voltage regulator, 2) ... Rotor, 22 ... Magnetic pole iron core, 25 ... Insulating resin member, 25
b...Radiating fin, 25C...Leading out part, 26...Front bracket, 26a...Annular groove, 30-...Rear bracket, soa...Annular groove, 32a, 82b--Flow path,
32a... Branch flow path, 33... Cooling cover, 88
a"・Radiation fin, 41...Rotor, 42.48...
・Magnetic pole iron core, 46...Cooling cup - Note that the same reference numerals in the drawings indicate the same or equivalent parts.

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. In addition, in a vehicle alternator equipped with a front bracket and a rear bracket that support the rotating shaft through bearings, a rectifier, and a voltage regulator, from both coil ends and one coil end of the stator coil. An insulating resin member liquid-tightly covers each lead-out lead-out terminal, the inner part is liquid-tightly connected to the outer end of the insulating resin member at one end of the coil, and the inner wall is connected to the outer end of the insulating resin member at one end of the coil, between the inner wall and the back surface of this insulating resin member. The front bracket has a cooling liquid flow passage formed in the circumferential direction, and is liquid-tightly connected to the outer end of the insulating resin member at the other end of the coil at the inner side, and has a circular wall between the inner wall and the insulating resin member. A rear bracket having a cooling liquid flow path formed in the circumferential direction and into which the lead-out terminal covered with the insulating resin member can be fitted in a liquid-tight manner; An alternator for a vehicle, comprising a cooling cover which branches cooling liquid from a flow path of a rear bracket into a branch flow path formed in the rear bracket and has the rectifier and voltage regulator fixed to the outer end surface thereof. (2) The vehicular alternator according to claim 1, wherein a part of the coolant is diverted from the coolant circulation system of the engine and distributed to the flow path. (3) The vehicular alternator according to claim 1 or 2, wherein a heat radiation fin is provided on the side of the branch flow passage of the cooling cover.