JPH03265446A - Protecting mechanism for current collector - Google Patents

Abstract

PURPOSE:To prevent contamination of a conductive ring by providing a ring having a first flange protruding radially at one end of a partition ring, providing a second flange having an end face opposed to the end face of the first flange at a sleeve, and providing an annular wall having a wall surface opposed to the outer periphery of the partition ring at the end face of the second flange. CONSTITUTION:A partition ring 31 is formed of a ring secured at one end to a second bracket and provided at the other end with a first flange 32 protruding radially. A slip ring unit 33 has a sleeve 35 for holding a conductive ring 34. A second flange 36 having an end face opposed to the end face of the flange 32 is provided at the sleeve 35, and an annular wall 37 having a wall surface opposed to the outer periphery of the sleeve 35 is provided at the end face of the flange 36.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a protection mechanism for a current collector suitable for use in an alternating current generator driven by the engine of a vehicle such as an automobile.

[Conventional technology]

Conventionally, this type of protection mechanism for a current collector has been used in a vehicle alternator shown in FIG. 3, and is configured, for example, as shown in FIG. 4. To explain this based on the same figure, in the same figure, the reference numeral 1 is a bowl-shaped first bracket having a suction hole 1a and a discharge hole 1b, and a bearing tube IC opening in both directions of the axis is located at the center of the end surface. is provided. Reference numeral 2 denotes a bowl-shaped second bracket having a suction hole 2a and a discharge hole 2b, which is fitted into the opening of the first bracket 1, and a bearing tube 2C that opens in one direction of the axis is provided at the center of the end surface. It is being

A stator 5 consisting of a stator core 3 and a stator coil 4 is held between the second bracket 2 and the first bracket 1 by bolts 6. Reference numeral 7 denotes a shaft having a rotor 11 consisting of a magnetic pole core 8.9 and an excitation coil 1o, which are located at a distance inside the stator 5, and which is inserted through the first bracket 1 and the second bracket 2, and which is inserted into the first bracket 1 and the second bracket 2. It is rotatably supported in the bearing tubes 1e and 2e via bearings 12.13, respectively,
A pulley 14, which is rotated by an engine (not shown), is fixed to the externally inserted end. Reference numeral 15 denotes a slip ring device having a conductive ring 16 connected to the excitation coil 10 of the rotor 11 and a plastic sleeve 17 holding the conductive ring 16, and is fixed to one end of the shaft 7. The sleeve 17 of this slip ring device 15 is integrally provided with a flange 19 having an annular wall 18 on its end face. Reference numeral 2o designates a partition ring for the cover, one end of which is fixed to the second bracket 2, and the other end facing the annular wall 18 of the sleeve 17 to form a labyrinth structure in the radial and axial directions. It is configured as follows. Thereby, the sliding contact portion between the conductive ring 16 and the brush described later is protected from being contaminated by, for example, salt water, oil, or dust, and it is possible to prevent poor conductivity and poor brush sliding. 21 is a current collector having a brush 22 that is in sliding contact with the conductive ring 16, and is provided around the slip ring device W15 via the partition ring 20, and is connected to the conductive ring 16. The magnetic pole core 8.9 is configured to be magnetized via the excitation coil 10. Further, 23 is the stator coil 4 due to the rotation of the magnetic pole core 8.9.
24 is a sheet sink that dissipates the heat generated by this rectifier 23, and 25 is an output voltage that detects the output voltage of the generator and controls the excitation current. A voltage regulator 26 adjusts the terminal voltage to a predetermined value, a heat sink 26 dissipates heat generated by the voltage regulator 25, and 27 and 28 fans fixed to each end face of the magnetic pole cores 8 and 9.

In the protection mechanism of the current collector configured in this way,
When the fans 26 and 27 rotate due to the rotation of the shaft 7, cooling air flows from the suction hole 1a of the first bracket 1 in the direction indicated by the arrow a.
as shown in both brackets 1.2 and bearings 12. Magnetic pole core 89, excitation coil 10, stator core 3
．． The stator coil 4 is cooled and discharged to the outside from the discharge hole ib.

On the other hand, cooling air flows from the suction hole 2a of the second bracket 2 into both brackets 1.2 as indicated by the arrows, and the bearing 13. Voltage regulator 24. Magnetic pole iron core9. Excitation coil 1
0. Stator core 3. The stator coil 4 is cooled and the discharge hole 2
It is discharged to the outside from b.

[Problem to be solved by the invention]

By the way, in the conventional protection mechanism of the current collector, since the gap formed between the sleeve 17 and the annular wall 18 is opened in the axial direction of the shaft 7, salt water mist floating in the atmosphere is , mist oil, dust, etc. may accumulate and accumulate inside the generator, staining various parts, and seriously impairing the generator's performance. In particular, both fans 27.28
When the conductive ring l rotates, cooling air flows into the partition ring 2° from the above-mentioned gap as shown by arrow C in Fig. 4, and the conductive ring l
There is a problem in that the G and the brush 22 become dirty, causing abnormal wear on the sliding contact portion, or failure in power generation due to poor conduction of the excitation current.

The present invention has been developed in view of the above circumstances, and can prevent the occurrence of contamination of the conductive ring and brush, thereby preventing abnormal wear of the sliding contact portion between the conductive ring and the brush and failure of conduction of the excitation current. Maintenance of the current collector can prevent generation failures! It provides a mechanism.

[Means to solve the problem]

A protection mechanism for a current collector according to the present invention includes a partition ring provided between a slip ring device and a current collector, one end of which is fixed to a bracket, and the other end of which has a first flange that protrudes in the outer diameter direction. A sleeve is provided with a second flange formed by a ring having an end face opposite to the flange end face of this ring, and an annular wall having a wall face opposite to the outer peripheral surface of the partition ring is provided on the flange end face of the sleeve. .

[For production]

In the present invention, when the fan rotates, the annular wall and both flanges can prevent cooling air from flowing into the partition ring from the radial direction and the axial direction.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be explained in detail by the Example shown in the figure.

FIG. 1 is a sectional view showing a protection mechanism of a current collector according to the present invention. In the figure and the following figures, the same members as in FIGS. 3 and 4 are given the same reference numerals, and detailed explanations are omitted. .

In the figure, the reference numeral 31 indicates a partition ring for the cover, one end of which is fixed to the second bracket 2;
It is formed by a partition ring having a first flange 32 protruding in the outer diameter direction at the other end. Reference numeral 33 denotes a slip ring device having a conductive ring 34 connected to the excitation coil 10 of the rotor 11 and in sliding contact with the brush 22 of the current collector 2, and a sleeve 35 made of, for example, molded resin, for holding the conductive ring 34. , housed within the brackets 1.2 and fixed to one end of the shaft 7.

A second flange 36 having an end face opposite to the end face of the first flange 32 is integrally provided on the sleeve 35 of this slip ring device 33. An annular wall 37 having a wall surface facing the outer peripheral surface is integrally provided.

In the protection mechanism of the current collector configured in this way,
Even if the cooling air containing salt water, oil or dust moves along the outer periphery of the partitioning ring 31 as shown by arrow C in FIG.
2.36 and the annular wall 37 can prevent cooling air from flowing into the partition ring 31 from the radial and axial directions. At this time, since the annular wall 37 rotates together with the shaft 7, the air in the vicinity of the annular wall 37 is affected by the rotational movement and convects and diverges in the radial direction, so that most of the air flows into the partition ring 31 from the direction indicated by arrow d. Never. However, the effect of preventing dust and the like from flowing into the partition ring 31 can be obtained by setting the axial labyrinth gap formed between the annular wall 37 and the first flange 32 to a dimension of less than 4fi.

Therefore, in this embodiment, since salt water, oil, dust, etc. contained in the cooling air do not reach the conductive ring 34 and the brush 22 due to the rotation of the fans 27 and 28, the conductive ring 34 and the brush 22 are not contaminated by salt water, etc. Occurrence can be prevented.

In this embodiment, a labyrinth structure in which the first flange 32 is provided on the partition ring 31 is shown, but the present invention is not limited to this, and as shown in FIG. By providing the flange 32 and providing an annular wall 38 facing the outer peripheral surface of the annular wall 37 on the end face of the first flange 32, a labyrinth structure with a layer effect can be obtained.

Further, in this embodiment, an example was shown in which the partition ring 31 and the current collector 21 were integrated, but the present invention may be used as separate units.

Furthermore, the number of labyrinths in the present invention is not limited to the embodiments described above, and the number can be changed as appropriate.

〔Effect of the invention〕

As explained above, according to the present invention, the partition ring provided between the slip ring device and the current collector has one end fixed to the bracket and the other end provided with the first flange projecting in the outer diameter direction. The sleeve is provided with a second flange formed by a ring having an end face opposite to the flange end face of this ring, and an annular wall having a wall face opposite to the outer circumferential face of the partition ring is provided on the flange end face of the sleeve. When the partition ring rotates, the annular wall and both flanges can prevent cooling air from flowing into the partition ring from the radial and axial directions.

Therefore, since salt water, oil, dust, etc. contained in the atmosphere do not reach the conductive ring and brush, it is possible to prevent the conductive ring and brush from being contaminated by salt water, etc., and to prevent abnormalities in the sliding contact area between the conductive ring and the brush. It is possible to prevent generation failures due to wear and poor continuity of excitation current.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a protection mechanism for a current collector according to the present invention, FIG. 2 is a sectional view showing another embodiment, and FIG. 3 is a sectional view showing a protection mechanism for a conventional current collector. FIG. 4 is a sectional view showing an example in which a conventional protection mechanism of a current collector is used in an alternating current generator for a vehicle. DESCRIPTION OF SYMBOLS 1...First bracket, 2...Second bracket, 7...Shaft, 10...Exciting coil, 11
...Rotor, 21...Current collector, 22...
Brush, 31...Partition ring, 32...First flange, 33...Slip ring device, 34...
- Conductive ring, 35... sleeve, 36... second flange, 37... annular wall. Agent Masuo Oiwa 1st 32nd

Claims (1)

[Claims] a slip ring device having a shaft rotatably supported by a bracket and having a rotor; a conductive ring fixed to one end of the shaft and connected to an excitation coil of the rotor; and a sleeve holding the conductive ring; A current collector having a brush provided around the sleeve of the slip ring device via a partition ring and in sliding contact with the conductive ring, the partition ring having one end fixed to the bracket and the other end having an outer diameter The sleeve is provided with a second flange formed by a ring having a first flange projecting in the direction, the second flange having an end face opposite to the flange end face of this ring, and a wall face opposite to the outer peripheral surface of the partition ring on the flange end face of the sleeve. 1. A protection mechanism for a current collector, comprising an annular wall having an annular wall.