JP3654312B2 - Method of assembling brush assembly of rotating electric machine and brush support jig used at the time - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brush support jig used when assembling a brush assembly of a rotating electrical machine (hereinafter referred to as a brush assembly), and a method for assembling a brush assembly using the brush support jig.
[0002]
[Prior art]
Conventionally, in a brush sliding generator in which a brush slides on the outer periphery of a slip ring, as shown in FIG. 8A, a brush holder 120 that holds a brush 110 and a brush holder 120 that is assembled to the brush holder 120 are assembled. There is a brush assembly 120 that uses a brush assembly 120 and a slip ring cover 130 that covers the outer periphery of the slip ring in a cylindrical shape (see Japanese Patent Laid-Open No. 1-274643).
In recent years, the brush ASSY 200 adopting a long brush 210 (total length of about 20 mm) longer than the conventional standard brush 110 (total length of about 15 mm) in order to meet the demand for a longer life for the brush in the ASSY100 {FIG. 8 (B) Reference} is required.
[0003]
[Problems to be solved by the invention]
However, when the long brush 210 is employed, the gap l ₂ between the slip ring cover 220 and the brush 210 is almost eliminated as shown in FIG. 8B, and a sufficient space for assembly cannot be secured. Assembling is extremely difficult and the assembling time becomes long (see FIG. 9). Incidentally, in the case of the brush ASSY 100 employing the standard brush 110 shown in FIG. 8A, the gap l ₁ between the slip ring cover 130 and the brush 110 is about 7 mm, whereas the brush ASSY 200 shown in FIG. In this case, the gap l ₂ between the slip ring cover 220 and the brush 210 is only about ₂ mm, and the assembly time is significantly longer than that of the brush ASSY 100.
The present invention has been made based on the above circumstances, and a first object is to provide a brush support jig that can be easily assembled in a short time even with a brush ASSY employing a long brush. A second object is to provide a method for assembling the brush assembly using the brush support jig.
[0004]
[Means for Solving the Problems]
According to invention of Claim 1, it can prevent that a brush jumps out from a brush holder by inserting a brush support jig | tool into the inner periphery of the cylinder part formed with a brush holder and a slip ring cover. As a result, a sufficient space (interval between the front end surface of the brush and the inner peripheral surface of the slip ring cover) necessary for assembling the brush ASSY to the outer periphery of the slip ring can be secured.
Further, the positioning of the brush support jig in the circumferential direction can be performed by the positioning rib provided on the outer peripheral surface of the cylindrical brush support jig and the rib provided on the inner peripheral surface of the slip ring cover. Thereby, incorrect assembly of the brush support jig can be prevented.
[0005]
According to the second aspect of the present invention, the assembly space for allowing the rotation shaft provided with the slip ring to pass through the inner periphery of the brush support jig having a cylindrical shape is secured. The brush can be stored inside the brush holder until it is assembled to the outer periphery of the slip ring.
According to the invention of claim 3, by providing the handle on the brush support jig, the handle can be easily pulled out by pulling out the brush support jig from the cylindrical portion.
[0006]
According to the invention of claim 4, the brush support jig is provided with two slip rings arranged side by side in the axial direction, and has two brushes that are in sliding contact with the outer peripheral surfaces of the two slip rings. Used for.
According to the invention of claim 5, the brush support jig is made of resin.
According to the sixth aspect of the present invention, the brush ASSY is disposed on the outer periphery of the slip ring in a state where the brush support jig is inserted into the inner periphery of the cylindrical portion to prevent the brush from protruding, and then the brush support jig is pulled out. Thus, the assembly of the brush ASSY can be performed easily and in a short time.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of the brush ASSY showing a state in which the brush support jig is inserted.
The rotating electrical machine of the present embodiment is a brush sliding type AC generator 1, as shown in FIG. 5, a front frame 2 and a rear frame 3 that form an outer shell, and an end cover that is disposed outside the rear frame 3. 4. A rotor and a stator (both will be described later) included in the front frame 2 and the rear frame 3 are included.
[0008]
The front frame 2 and the rear frame 3 are each made of aluminum die casting, are combined with their outer peripheral end faces facing each other, and are fixed by fastening a plurality of stat bolts 5 and nuts 6.
The end cover 4 is fixed to the rear frame 3 so as to cover components such as a brush ASSY 7 (see FIG. 3), a voltage regulator (IC regulator) 8 and a rectifier 9 assembled outside the rear frame 3.
[0009]
The rotor includes a rotating shaft 11 through which the rotational power of the engine is transmitted via a pulley 10, a pair of Landel-type pole cores 12 that are press-fitted and fixed to the outer periphery of the rotating shaft 11, and a field magnet wound around the Landel-type pole core 12 It consists of a coil 13 and the like. The rotating shaft 11 is rotatably supported by the front frame 2 and the rear frame 3 via two ball bearings 14 and 15. The pulley 10 is fitted on the outer periphery of one end portion of the rotating shaft 11 that protrudes to the outside of the front frame 2, and is fastened and fixed to the rotating shaft 11 by a lock nut 16.
[0010]
Each of the pair of pole cores 12 has a cylindrical boss portion 12a and a plurality of claw-shaped magnetic pole pieces 12b formed on the outer periphery of the boss portion 12a, and the boss portions 12a are fielded from both sides in the cylindrical direction. Pressed into the inner periphery of the coil 13, the claw-shaped magnetic pole pieces 12 b are alternately meshed with the outer periphery of the field coil 13.
The field coil 13 is electrically connected to a slip ring 17 provided at the other end of the rotating shaft 11 and is excited from a battery (not shown) through a brush 18 that is in sliding contact with the outer peripheral surface of the slip ring 17. Is supplied.
Centrifugal fans 19 that generate cooling air by rotating integrally with the pole core 12 are fixed to end faces of the respective pole cores 12 by welding or the like.
[0011]
The stator includes a stator core 20 that is press-fitted into the inner periphery of the front frame 2, and a stator coil 21 that is wound around the stator core 20.
The stator core 20 is formed, for example, by laminating a plurality of thin steel plates into an annular shape, and a large number of slots (not shown) are provided on the inner peripheral side.
The stator coil 21 is inserted into each slot of the stator core 20 with, for example, three independent coils Y-connected or Δ-connected, and an AC voltage is generated in each coil by relative rotational motion with the rotor.
[0012]
As shown in FIG. 3, the brush ASSY 7 includes a brush 18, a spring 22, a brush holder 23, and a slip ring cover 24.
The brush 18 is a long brush having a total length of about 20 mm, which is longer than a conventional standard brush.
The spring 22 presses the brush 18 against the outer peripheral surface of the slip ring 17 and applies a contact pressure against the slip ring 17 to the brush 18.
The brush holder 23 holds the brush 18 and the spring 22 on the outer periphery of the slip ring 17, and stores the spring 22 and the brush 18 in two storage portions 23a, respectively.
The slip ring cover 24 is combined with the brush holder 23 and covers the outer periphery of the slip ring 17 together with the brush holder 23 in a cylindrical shape.
[0013]
A rubber seal mat 25 is fitted between the brush assembly 7 and the rear frame 3 and is sandwiched between the brush assembly 7 and the rear frame 3. It is sealed. A rubber seal cap 26 is hermetically covered on the end surface of the brush assembly 7 on the end cover 4 side.
[0014]
Next, a method for assembling the brush ASSY 7 will be described.
The assembly of the brush ASSY 7 is performed by inserting the brush ASSY 7 into the inner periphery of the cylindrical portion formed by the brush holder 23 and the slip ring cover 24 in advance before assembling the brush ASSY 7 on the outer periphery of the slip ring 17. A brush support jig 27 is used to prevent this.
As shown in FIG. 4, the brush support jig 27 is formed in a cylindrical shape that fits on the inner periphery of the cylindrical portion (however, it can fit on the outer periphery of the slip ring 17), and its outer peripheral surface. Are provided with a plurality of positioning ribs 27a that engage with ribs 24a provided on the inner peripheral surface of the slip ring cover 24 and perform positioning (rotation prevention) in the circumferential direction. In addition, a grip 27b is integrally provided at one peripheral edge in the cylindrical direction for gripping the brush support jig 27 when the brush support jig 27 is pulled out from the cylindrical portion of the brush ASSY7. The brush support jig 27 is preferably made of a material that does not damage the brush 18 (for example, resin).
[0015]
(Assembly method)
First, the brush support jig 27 is inserted into the inner periphery of the cylindrical portion while pressing the brush 18 against the urging force of the spring 22 (see FIG. 1). As a result, the brush 18 is prevented from popping out by the brush support jig 27, so that an assembly space corresponding to the inner diameter of the brush support jig 27 (about 16 mm in this embodiment) is secured on the inner periphery of the cylindrical portion. (See FIG. 2). Here, since it is necessary to pull out the brush support jig 27 from the cylindrical portion after assembling the brush ASSY 7, the brush support jig 27 is attached from the side (right side in FIG. 1) of the brush ASSY 7 where the seal cap 26 is put. It is inserted and attached so that the handle 27b comes to the seal cap 26 side.
[0016]
Subsequently, as shown in FIG. 6, the brush ASSY 7 to which the brush support jig 27 is attached is fitted to the outer periphery of the slip ring 17 from the other end side of the rotating shaft 11, and the two brushes 18 slip each. The brush assembly 7 is fixed to the rear frame 3 at a predetermined position arranged on the outer periphery of the ring 17.
Subsequently, the brush support jig 27 is pulled out from the tube portion of the brush ASSY 7 in the axial direction, and the brush 18 that has been held by the brush support jig 27 is brought into contact with the outer peripheral surface of the slip ring 17 (see FIG. 7). ).
The assembly of the brush ASSY 7 is completed through the above steps.
[0017]
(Effect of this embodiment)
In this embodiment, before the brush assembly 7 is assembled to the outer periphery of the slip ring 17, the brush support jig 27 is inserted in advance into the tube portion of the brush assembly 7 to prevent the brush 18 from popping out. An assembly space corresponding to the inner diameter of the brush support jig 27 can be secured around the circumference. As a result, the brush ASSY 7 that employs the long brush 18 can be assembled easily and in a short time, similar to the brush ASSY that employs the standard brush.
Further, since the brush support jig 27 is provided with positioning ribs 27a on the outer peripheral surface thereof, the brush support jig 27 can easily perform circumferential positioning (rotation prevention) with respect to the brush ASSY7. Can be prevented.
Further, by using the brush support jig 27, the brush 18 can be stored in the storage portion 23 a of the brush holder 23 until the brush ASSY 7 is assembled to the outer periphery of the slip ring 17. There is no such thing.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a brush ASSY showing a state in which a brush support jig is inserted.
FIG. 2 is a front view of a brush assembly showing a state in which a brush support jig is inserted.
FIG. 3 is a cross-sectional view of a brush ASSY.
FIG. 4 is a perspective view of a brush support jig.
FIG. 5 is a cross-sectional view of an AC generator.
FIG. 6 is an explanatory diagram showing an assembly process of the brush ASSY.
FIG. 7 is an explanatory diagram showing an assembly process of the brush ASSY.
8A is a front view of a brush ASSY employing a standard brush, and FIG. 8B is a front view of a brush ASSY employing a long brush.
FIG. 9 is a graph showing the relationship between the assembly space of the brush assembly and the assembly time.
[Explanation of symbols]
1 AC generator (rotary electric machine)
7 Brush ASSY
11 Rotating shaft 17 Slip ring 18 Brush 23 Brush holder 24 Slip ring cover 24a Rib 27 Brush support jig 27a Positioning rib 27b Handle

Claims (6)

A brush that is in sliding contact with the outer peripheral surface of a slip ring provided on the rotating shaft of a rotating electrical machine, a brush holder that holds the brush, and a slip that is assembled to the brush holder and covers the outer periphery of the slip ring together with the brush holder A brush assembly composed of a ring cover or the like is used when assembled to the outer periphery of the slip ring,
Provided in a cylindrical shape to be fitted to the inner periphery of the cylindrical portion formed by the said slip ring cover and the brush holder, before assembling the brush Kumitai the outer periphery of the slip ring, in advance before Symbol cylindrical portion For positioning in the circumferential direction by being inserted into the inner periphery of the sleeve to prevent the brush from popping out and engaging with the rib provided on the inner peripheral surface of the slip ring cover on the cylindrical outer peripheral surface A brush support jig provided with ribs . A brush that is in sliding contact with the outer peripheral surface of a slip ring provided on the rotating shaft of a rotating electrical machine, a brush holder that holds the brush, and a slip that is assembled to the brush holder and covers the outer periphery of the slip ring together with the brush holder A brush assembly composed of a ring cover or the like is used when assembled to the outer periphery of the slip ring,
Provided in a cylindrical shape that fits to the inner periphery of the cylindrical portion formed by the brush holder and the slip ring cover, before assembling the brush assembly to the outer periphery of the slip ring, The assembly space is secured so that the brush is prevented from popping out by being inserted into the inner periphery, and the rotating shaft provided with the slip ring is provided on the inner periphery of the cylindrical shape. Brush support jig. The brush support jig according to claim 1 or 2,
A brush support jig characterized in that a handle is provided for gripping when pulling out from the cylindrical portion. The brush support jig according to any one of claims 1 to 3,
Two slip rings are provided side by side in the axial direction, and are used in the rotating electric machine having two brushes that are in sliding contact with the outer peripheral surfaces of the two slip rings, respectively. Before assembling to the outer periphery, the brush support jig is inserted into the inner periphery of the cylindrical portion in advance to prevent the two brushes from protruding. The brush support jig according to any one of claims 1 to 4, wherein the brush support jig is made of resin. A method of using any of the brush support jig according to claim 1-5 assembling the brush Kumitai the outer periphery of the slip ring,
After inserting the brush support jig on the inner periphery of the cylindrical portion, the brush assembly is fitted on the outer periphery of the slip ring, and the brush assembly is disposed on the outer periphery of the slip ring. A method of assembling a brush assembly of a rotating electrical machine, wherein the brush support jig is pulled out from a cylindrical portion and the brush is brought into contact with the outer peripheral surface of the slip ring.

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