JPH0227904B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an alternator for a vehicle such as an automobile or a railway vehicle, and in particular, an alternator for a vehicle having an improved dust-proof and waterproof structure of a slip ring part. Regarding.

[Background of the invention]

Generally, the mainstream of automotive alternators is a rotating field type having a slip ring. This slip ring is an important part that affects the life of the generator and needs to be sufficiently protected from dust, moisture, mud, etc., and various proposals have been made in the past. For example, JP-A-53-53712, JP-A-53-
As disclosed in publications such as No. 53713 and Japanese Unexamined Patent Publication No. 53-53714, it has been proposed to protect the slip ring by integrating a brush holder with a cylindrical cover that covers the slip ring. Although it has been
In this configuration, since the brush storage section is open to the outside, a separate sealing member must be added to the mounting section when the brush is attached, which complicates the structure of the brush mounting section.

Furthermore, as disclosed in Japanese Utility Model Application Publication No. 56-15257, a part of the generator housing is made into a cylindrical slip ring cover, and a notch is provided in this part to allow the brush holder to pass through. A configuration has also been proposed in which the gap between the brush holder and the slip ring cover is closed with a sealing member, but in this configuration, when the brush holder is attached, the brush holder is slid in the direction of the rotation axis, so the effect of the sealing member becomes ineffective. Enough is enough.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an alternator for a vehicle that eliminates the drawbacks of the prior art as described above, can seal the slip ring portion well, and improves the workability of assembling the slip ring and the brush portion. .

[Summary of the invention]

To achieve this object, the present invention integrates a cylindrical member covering a slip ring with an insulator between cooling fins for mounting a diode that rectifies the output of a stator winding, or with a wiring board for the diode. A substantially L-shaped labyrinth is provided in the cylindrical part, and the spaces between the brush holder and the cylindrical member, between the cylindrical member and the bracket, etc. are sealed with an integrated sealing member to improve assembly and sealing performance. It is characterized by the fact that

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, a pair of brackets 1 and 2 forming the outer shell of a generator sandwich a stator 3 consisting of a stator core 3a and a stator winding 3b wound around the stator core 3a. Cylindrical bearing boxes 4 and 5 that protrude toward the inside of the generator are provided at the center of the sides of the brackets 1 and 2, and a rotating shaft 8 is connected by shafts 6 and 7 provided in these shaft boxes 4 and 5. is rotatably supported. A pair of claw-shaped pole cores 9 and 10 and a yoke 11 that forms a magnetic path between these cores are fixed to the rotating shaft 8 so as to be located inside the stator 3. A field coil 12 is held between the pole cores 9 and 10, the yoke 11, the field coil 12, and the like to constitute a rotor.
A booley 27 is fixed to one end of the rotating shaft 8 and driven by a belt by an engine. Centrifugal cooling fans 13 and 14 having a diameter smaller than the inner diameter of the stator 3 are fixed to both sides of the pole cores 9 and 10 concentrically with the rotating shaft 8. Fan 1 is inside bracket 2.
4 and the opposing fan guide plate 1 with an appropriate gap.
5 is installed. Cooling air inlets 1a, 2a are provided on each side of the brackets 1, 2, and the air introduced through these inlets 1a, 2a cools the inside of the generator, and then becomes hot air and flows into the brackets 1, 2.
It is designed to be discharged from discharge ports 1b and 2b provided at 2. A slip ring 16 fixed to the rotating shaft 8 is provided between the bearing 7 and the pole core 10, and a brush 19 housed in a brush holder 26 is provided.
A field current is supplied to the field coil 12 via an IC regulator 20 that adjusts the output voltage. Further, as shown in FIG. 2, cooling fins 17 and 18 having a substantially horse-shape shape that sandwich an insulator 22 are arranged inside the bracket 2, and a plurality of diodes 1 attached to these cooling fins 17 and 18 are arranged.
7' and 18' are fixed to the bracket 2 by bolts 21a together with a wiring board 23 and the above-mentioned guide plate 15 for interconnecting them to form a three-phase full-wave rectifier circuit. The distribution board 23 includes terminals 23a for interconnecting the diodes 17' and 18',
A stator winding connection terminal 23b, a connection terminal 23c for a field current supply diode 28, and the like are provided. The distribution board 23 is made of an insulating material such as synthetic resin, and is integrated with the distribution board 23. A substantially cylindrical member 24 surrounding the slip ring 16 with a certain gap between the slip ring 16 and the slip ring It has a dustproof and waterproof structure. Pole core 10 of this substantially cylindrical member 24
The side facing the slip ring 16 is arranged with a constant gap from a substantially concave rib 16' made of a part of the insulating material of the slip ring 16, thereby forming a labyrinth structure. Furthermore, an opening 24a is provided in the inner peripheral portion facing the slip ring 16 (see FIGS. 1 and 3).
(See Figure C), a passage 24b communicating with the opening 24a and parallel to the rotating shaft 8 is formed on the outer circumferential side to form a generally L-shaped labyrinth structure as a whole. The opening of the passage 24b is located on the inner diameter side of the centrifugal fan 14, so that the heat generated by the friction between the brush 19 and the slip ring 16 is transferred to the opening by the negative pressure generated by the centrifugal fan 14. 24
a, the outlet 2 of the bracket 2 via the passage 24b
It can be discharged to the outside of the generator from b.

As shown in FIG.
As shown in FIG. substantially plate-shaped seal member 2
5b. Further, on the side where the substantially cylindrical member 24 faces the bearing box 5, a substantially ring-shaped seal member 25a having a shape as shown in FIG. Seal. This approximately ring-shaped sealing member 25a has a hole 25e through which the bearing 7 is passed when the generator is assembled, and a convex projection 25c is provided at a portion facing the opening 24a and the passage 24b. It is designed to fit into and seal the end face hole 24d of 24b. The substantially plate-shaped seal member 25b and the substantially ring-shaped seal member 25a are integrally formed of rubber, synthetic resin, or the like. Next, a method for assembling the brush holder 26 will be described. First, the substantially plate-shaped seal member 25b and the substantially ring-shaped seal member 25a are set on the substantially cylindrical member 24, and the brush holder 26 is passed through the square hole 25d and the substantially square hole 24c from a direction perpendicular to the rotating shaft 8.
It is fixed to the cooling fins 17 and 18 with bolts 21b, and in this way the diodes 17' and
Sub-assemblies such as 18' and brush holder 26 can be fixed to bracket 2 with nuts 21c. In this case, the assembly direction of the subassembly is the direction of the rotation axis, which is the same direction as the direction in which the substantially ring-shaped seal member 25a is compressed, so that the seal member does not get caught in other parts, making the work easier. , sealing performance is also improved.

5 and 6 show other different embodiments of the present invention, and the same or corresponding parts as in FIGS. 1 to 4 are given the same reference numerals. Fifth
The embodiment shown in the figure differs from the embodiment shown in FIG. . Further, in the embodiment shown in FIG. 6, one bracket is divided into 2A and 2B, the bearing 7 is provided on the bracket 2A side, and the slip ring 16, brush holder 26, cooling fins 17, 18, wiring board 23, etc. The point that the substantially cylindrical member 24 and the wiring board 23 are integrated when housed in the bracket 2B is that
This is the same as the embodiment shown in FIG. In this embodiment, a suction port 2a' is formed on the side of the bracket 2A, and is connected to the side of the bracket 2B for ventilation.

〔Effect of the invention〕

As described above with reference to the embodiments, according to the present invention, the generator can be easily assembled, the dustproof and waterproof properties of the slip ring portion can be improved, and the temperature around the slip ring can be reduced.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of the alternator of the present invention, Fig. 2 is a plan view of the inside of the bracket on the side opposite to the pulley in Fig. 1, and Figs. 3 A to C are the configuration of the substantially cylindrical member. FIG. 4A is a plan view, FIG. 4B is a front view, FIG. 4C is a sectional view taken along line P-P of FIG. Same figure A
is a plan view, B is a front view, and C is a Q of B in the same figure.
-Q line sectional view, FIG. 5, and FIG. 6 are side sectional views showing other embodiments of the alternating current generator of the present invention, respectively. 1, 2...Bracket, 3...Stator, 3b...
... Field coil, 8 ... Rotating shaft, 16 ... Slip ring, 19 ... Brush, 17, 18 ... Cooling fin, 17', 18' ... Diode, 22 ... Insulator, 23 ... Distribution board , 24... substantially cylindrical member.

Claims (1)

[Scope of Claims] 1. A stator held by a bracket, a rotor provided opposite to the stator, a rotating shaft that is rotatably supported by the bracket and supports the rotor, and this rotating shaft. a slip ring attached to one side of the rotor for supplying excitation current to the field coil of the rotor, a brush provided opposite to the slip ring, and a substantially cylindrical member provided surrounding the outer periphery of the slip ring. , a pair of cooling fins equipped with diodes for rectifying the output of the windings of the stator; an insulator sandwiched between the pair of cooling fins; What is claimed is: 1. A vehicle alternator comprising a wiring board for connection, characterized in that one of the insulator or the wiring board and the substantially cylindrical member are integrally formed. 2. In claim 1, the cylindrical member has an opening on its inner diameter side and a substantially L-shaped passage extending in the direction of the rotation axis on its outer diameter side. A vehicle alternator featuring: 3. In claim 1, a square hole passing through a brush holder is provided in a portion of the substantially cylindrical member corresponding to a sliding portion between the slip ring and the brush, and the brush holder and the brush holder are provided with a square hole that penetrates the brush holder. A gap formed between the substantially cylindrical member and the bracket is sealed with a plate-shaped seal member, and a ring-shaped seal member integrally formed with the plate-shaped seal member is used to seal the gap between the substantially cylindrical member and the bracket. A vehicle alternator characterized by the following.