JPH01234031A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To facilitate assembling of a brush holder, by attaching the brush holder to a linking member having a first coupling part which is couplied with the inner surface of the tubular part of a bracket and a second coupling part which is coupled with the brush holder. CONSTITUTION:A rotary shaft 12 to which a commutator 11 is fixed is inserted in a bearing 64 so that the shaft is freely rotated. The bearing 64 is hounsed in a tubular part 50 of a bracket 5. A first coupling part for coupling a linking member 6 is formed at an inner plate part 61 of the tubular part 50. A second coupling part for coupling the linking member 6 is formed at an outer plate part 62 at the rear end part of a yoke 2. A planar surface of the linking member 6 which is coupled with the bracket 5 through the first and second coupling parts 61 and 62 is brought into close contact with the planar part of the bracket 5. A brush holder 7 is attached to the other surface. Thus, molding of a complicated insert and cutting are not required, and the assembling work of the brush holder can be performed readily.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to rotating electric machines such as electric vehicles and generators, and is particularly applicable to starters for internal combustion (internal combustion engine) in which a brush holder is attached to a bracket using a connecting member. The invention relates to a suitable rotating electric machine.

[Prior Art 1] As shown in FIG. 5, conventionally, small motors have a positive side connection piece 1 between the inner wall 111 of the bracket 110 made of cast aluminum and the end face 121 of the cylindrical yoke 120.
30, a brush holder 150 having a minus side connection piece 140 inserted therein is inserted, and the outer circumferential surface 151 of each brush holder 150 is fitted and fixed to the inner circumferential wall 112 of the bracket 110 or the inner circumferential wall 122 of the yoke 120.

For this reason, this type of small motor has a problem in that it requires a large number of assemblies. In addition, gH is added to the abrasive quality of the bracket 110.
Since 34q aluminum is used, manufacturing costs are high, the dimensional accuracy of the bracket 110 is poor, and cutting is required after casting.

Utility Model No. 61-58843 that solved this problem
In the publication, a blanket made of thin plate is used,
A rotating electric machine is shown in which a brush holder is insert-molded into this bracket, and the brush holder and yoke are fitted at a mark portion.

[Problems to be Solved by the Invention] In the conventional rotating electrical machine having the above configuration, in consideration of heat resistance from the brush sliding portion, it is necessary to select a thermosetting resin as the material of the brush holder.

However, it is extremely difficult to use thermosetting resins for insert molding, and thermosetting resins do not have good dimensional accuracy, so there are issues such as the need for cutting at the fitting part of the seal. was there.

An object of the present invention is to provide a rotating electric machine in which a brush holder can be easily assembled to a thin plate bracket without performing complicated inlet molding or cutting.

[Means for Solving the Problems] A rotating electric machine of the present invention comprises a rotating shaft to which a contactor such as a commutator or a slip ring is fixed, a cylindrical portion through which the rotating shaft is rotatably inserted, and a cylindrical portion of the cylindrical portion. a bracket formed by press-molding a thin plate and having a plate-shaped portion extending in the outer circumferential direction; a brush holder that holds a brush that contacts the contact f and is electrically connected to the contact; It has a first fitting part that fits into the inner peripheral surface of the cylindrical part of the bracket, and a second fitting part that fits with the brush holder, and the brush holder is connected to the plate of the bracket. A configuration including a connecting member attached to the shaped part was adopted.

[Function] The rotating electric machine of the present invention has the following function due to the above configuration.

The first fitting part of the connecting member is fitted with the inner peripheral surface of the cylindrical part of the bracket, and the second fitting part of the connecting member is fitted with the brush holder, thereby connecting the brush holder to the connecting member. Since it is attached to the plate-shaped part of the bracket by using a screw, there is no need for complicated insert molding or cutting.

[Effects of the Invention] The rotating electrical machine of the present invention has the following effects due to the above configuration and operation.

The brush holder can be easily assembled to the bracket using the connecting member without complex insert molding or cutting.

[Example] An example of the rotating electric machine of the present invention will be described based on FIGS. 1 to 4.

1 and 2 show the main parts of a motor section 1 of a starter for an automobile internal combustion engine.

The motor part 1 of the starter (rotary type 11) A for automatic heavy-duty internal combustion R includes a commutator 11, a rotating shaft 12, and an armadure core 1.
3 and an armature B which is a rotor consisting of an armature coil (not shown) which is a rotating conductor, etc.
and a field C which is a stator composed of a cylindrical rod 2 and a pole core 14 such as a ferrite magnet. , 15 are Armadure B thrust adjustment washers.

The yoke 2 is made of a ferromagnetic material, has a pole core 14 attached to its inner peripheral wall, and has a cylindrical part 21 that coaxially accommodates the rotating shaft 12.
A flange plate 25 is formed which extends outward from the outer periphery of the rear end portion 22 of the cylindrical portion 21 and has a fastening hole 24 for fastening to the bracket 5 with a screw 23.

The rectified pH electrically connects the armadure coil and the fixed bracket 5 via the + side brush 3 and the one side brush 4.

The + side brush 3 is attached to the + side plate spring 31.

This leaf spring 31 is connected to a spring portion 32 that serves as both a brush spring and a brush lead wire that brings the positive brush 3 into contact with the surface of the commutator 11, and a positive terminal pull 34 that is insert-molded in a resin bushing 33. Connection part 3
Consists of 5. This spring part 32 has a + side brush 3.
In order to stabilize the position of the brush holder 7, two fulcrums 32a are provided in line contact with the brush holder 7. The connecting part 35 is
It has a cylindrical portion 3B into which the tip of the + side terminal 34 is press-fitted, and a flange-like portion 31 formed at the end of the cylindrical portion 36. The brim portion 31 presses the brush holder 7 in the direction of the brackets 1 to 5 due to a springback action.

The one side brush 4 is attached to the negative side leaf spring 41.

This leaf spring 41 consists of a spring portion 42 that serves as both a brush spring and a brush lead wire for bringing the minus side brush 4 into contact with the surface of the commutator 11, and a connecting portion 45 that is connected to the minus side terminal pull 44. . This spring portion 42 is provided with two fulcrums 42a that make line contact with the brush holder 7 in order to stabilize the position of the minus side brush 4.

The connecting portion 45 has a rectangular cylindrical portion 46 into which the tip of the − side terminal pull 44 is press-fitted, and a flange-like portion 47 formed at the end of the cylindrical portion 46 . The brim portion 47 is for springback fishing and presses the brush holder 7 in the direction of the bracket 5.

The bracket 5 is formed by pressing a thin plate such as an iron plate or an aluminum plate with a pressing force LL, and includes a cylindrical part 50 through which the rotating shaft 12 is rotatably inserted, and a plate-shaped part extending in the outer circumferential direction of the cylindrical part 50. It has 51.

The cylindrical portion 50 has a first cylindrical portion 52 into which the holder plate 6 is press-fitted, and a second cylindrical portion 54 provided from the first cylindrical portion 52 via a step 53.

An oil seal 55 is press-fitted into the inner periphery of the second cylindrical portion 54 to prevent lubricating oil for the internal combustion engine from flowing into the starter A.

The plate portion 51 includes a flange plate 56 whose inner wall surface is fixed to the outer wall surface of the flange plate 25 of the yoke 2, and an annular plate 57 formed on the inner periphery of the flange plate 56.

The flange plate 56 has a fastening hole 58 for fastening the flange plate 25 of the yoke 2 with the screw 23, and a mounting hole (not shown) for mounting to an internal combustion engine.

A holder plate 6, which is a connecting member, is assembled on the inner wall surface of the annular plate 57, and a tartar pull hole 5 is provided in which a pusher 133 formed by forming the + side terminal pull 34 in one note is fixed.
9 is formed.

The holder plate 6 is formed by pressing a thin plate such as a steel plate or an aluminum plate, is electrically connected to the bracket 5, acts as a reinforcing member for the bracket 5, acts as a positioning member for the brush boulder γ, and is grounded to the bracket 5. It is used for taking out some of the terminals 44.

This holder plate 6 is an annular plate 57 of the bracket 5.
an annular flat plate part 60 attached to the inner wall surface of the bracket 5;
an inner plate part 61 which is a first fitting part that is press-fitted into the first cylindrical part 52; and an outer plate portion 62 which is a fitting portion.

The flat plate part 60 is formed by cutting out a part of the inner circumference and then bending it toward the tip of the yoke 2.
4 are integrally formed. The flat plate part 60 has +
Terminal holes 63 are formed into which the bushing 33 formed by molding the side termiple 34 is inserted.

A bearing 64, which is a bearing that rotatably supports the rotation @12, is attached to the inner surface of the inner plate portion 61.

This bearing 64 is sandwiched between an inner peripheral protrusion 65 formed on the inner plate portion 61 and a step 53 formed on the cylindrical portion 50 of the bracket 5.

The inner surface of the outer plate portion 62 performs centering of the brush holder 1. The outer circumference of the outer root portion 62 is connected to the O-ring 66 along with the inner wall surface of the rear end portion 22 of the yoke 2 and the annular plate 57 of the bracket.
By configuring the interference margin, the O-ring 66 can be closely attached to each wall surface without any gaps, so that waterproofness can be improved.

The brush boulder 7 holds the + side brush 3 and a portion of the brush 4, and is integrally molded from a thermosetting resin such as a phenolic resin.

The brush holder 7 includes an annular wall 70 attached to the inner wall surface of the flat plate portion 60 of the holder plate 6, and a ring-shaped side wall 71 extending perpendicularly from the outer periphery of the annular wall 70.

The annular wall 70 is provided with a + side brush attachment part 70a that determines the axial attachment position of the + side brush 3 on the tip side surface, and a position opposite to the brush attachment part 70a, which determines the attachment position of the + side brush 4 in the axial direction. A partial brush mounting portion 70b is provided that determines the mounting position in the axial direction.

11111 On the outer periphery of the wall 71, there is a fitting part 72 fitted into the inner surface of the outer plate part 62 of the holder plate 6, and a stepped part extending from the fitting part 72 in the horizontal direction of the tip of the yoke 2. 73 are provided.

A holder plate 6 is provided between the fitting part 72 and the stepped part 73.
A step 74 is formed that is slightly smaller than the thickness of the outer plate portion 62. On the inner circumferential surface of the stepped portion 73, → side leaf spring 31 is provided.
Two contact portions 73a are provided in line contact with the fulcrum 32a of the spring portion 32, and two contact portions 73b are provided in line contact with the fulcrum 42a of the spring portion 42 of the negative side leaf spring 41. The inner circumferential surface of the outer plate portion 62 of the holder plate 6 and the fitting "N572" of the brush holder 7 may be fitted using a fitting method such as a seal fitting, an interference fitting, or an uneven fitting. good.

Further, a substantially semicircular terminal protrusion 75 is formed on the inner periphery of the side wall 71 located between the + side brush attachment portion 70a and the one side brush attachment portion 70b of the annular wall 70.

The terminal protruding portion 15 has an axial hole 7 into which the + side terminal 34 and the − measurement terminal 44 are projected, and the ends of the + side plate spring 31 and the − side plate spring 41 are fitted therein.
6, and an insertion groove 77 formed on the side of the hole 76 facing the axis 1, through which the ends of the + side leaf spring 31 and the − side leaf spring 41 are inserted.
to do.

A method of attaching the brush boulder 7 to the bracket 5 of the starter A of the automobile internal combustion engine of this embodiment will be explained based on the drawings.

First, the yoke 2 was manufactured by molding a ferromagnetic material.
A bracket 5 and a holder plate 6 are manufactured by forming a thin plate such as an iron plate or an aluminum plate into a predetermined shape by press working, and a brush holder 7 is manufactured into a predetermined shape using thermosetting fl resin.

Then, the pusher 133 with the + side terminal 34 insert-molded is press-fitted into the terminal hole 59 formed in the annular plate 57 of the bracket 5, and the oil seal 55 is assembled into the second cylindrical part 54 of the bracket 5 by press-fitting. .

On the other hand, a bearing 64 is assembled on the inner surface of the inner plate part 61 of the holder plate 6, and a part of the inner circumference of the flat plate part 60 is cut and raised to form one side terminal 44'.

Then, the inner plate part 61 of the holder plate 6 is inserted into the first cylindrical part 52 of the bracket 5 without applying any cutting force.
and insert the bushing 33 protruding from the terminal hole 59 of the bracket 5 into the terminal hole 63 of the holder plate 6 to fix the flat plate part 60 of the holder plate 6 to the inner wall surface of the annular plate 57 of the bracket 5. do.

At this time, since the bearing 64 is sandwiched between the step 53 formed on the cylindrical part 50 of the bracket 5 and the inner peripheral protrusion 65 formed on the inner plate part 61 of the holder plate 6,
The bearing 64 can be prevented from falling off the holder plate 6.

Next, the + side terminal 34 and the one side terminal 44 assembled in a protruding state on the flat plate part 60 of the holder plate 6 are attached to the respective terminal protruding parts 1 of the brush holder 7.
5 into the axial hole 76 of the brush holder 7.
The fitting part 72 is fitted into the outer plate part 62 of the holder plate 6 without cutting. At this time, the brush holder 7 is centered by the inner surface of the outer plate portion 62, and the center line of the brush holder 7 and the center line of the rotating shaft 12 are aligned.

And the cylindrical part 3 of the connecting part 35.45 of the leaf spring 31.41
6.46 into the protruding parts of the + side terminal 34 and - side terminal 44, and fit into the axial hole 76 of the terminal protrusion 75. After that, the + side terminal 34
By connecting the - side terminal 44 and the cylindrical part 36.46 by welding, the flange part 37.47 moves the brush holder 7 to the annular plate of the bracket 5 due to the springback action, as shown in FIG. Press in 57 directions. Therefore, the movement of the brush holder 7 in the axial direction with respect to the bracket 5 is restricted, and the brush holder 7 is assembled to the inner wall surface of the annular plate 57 of the bracket 5 via the holder plate 6.

Then, Armadure B is assembled to the bracket 5.

(Furthermore, between the commutator 11 and the spring portion 32.42 of the leaf spring 31.41, the + side brush 3 and m brushes 4
Assemble. ) At this time, the two fulcrums 32a and 42a of the leaf springs 31 and 41 are in line contact with the contact parts 73a and 73b of the stepped part 73 of the brush holder 7, so that the mounting positions of the first side brush 3 and the m brushes 4 are fixed. is stabilized, and the − side brush 3 and the m brushes 4 come into contact with the surface of the commutator 11 at optimal positions.

The outer plate part 62 of the holder plate 6 and the stepped part 73 of the side wall 71 of the brush holder 7 are fitted to the rear end part 22 of the yoke 2 to which the pole core 14 is attached, forming the flange plate 25 of the yoke 2. 7 of fastening hole 24 and bracket 5
The bracket 5 is fastened to the yoke 2 with the screw 23 by aligning the fastening hole 58 formed in the flange Ifi56.

therefore,? ! 2. By fixing the brush holder 7 to the inner wall surface of the bracket 5 made of a thin plate using the holder plate 6, the bracket 5 and the brush holder 7 can be easily connected without performing complicated insert molding or cutting. Can be assembled.

[Other Embodiments] In this embodiment, the rotary thunder of the present invention is employed in a starter for an internal combustion engine for an automobile, but the rotary thunder of the present invention can also be applied to other electric engines in which a brush is in sliding contact with a rectifier f or a slip ring.
It may also be used in generators, etc.

In this embodiment, an inner protrusion was formed on the inner plate of the holder plate as a stop after the bearing, but the inner protrusion may be formed on the brush holder as a stop when handling the bearing, and depending on the usage environment, Bearing people do not need to apply a stopper.

In this example, the inner plate part of the holder plate with the bearing attached was press-fitted into the cylindrical part of the bracket, but the inner plate part of the holder plate with the oil seal attached could also be press-fitted into the cylindrical part of the bracket. Alternatively, the inner plate part of the holder plate may be press-fitted into the cylindrical part of the bracket in class A. Although the end of the spring is fitted, the end of the leaf spring may be tightly fitted into the axial hole and insertion hole formed in the terminal protrusion of the brush holder.

In this embodiment, a holder plate was used as the connecting member for attaching the brush holder to the plate-shaped part of the bracket, but a cylindrical body or a plurality of circular arc-shaped bodies fitted into the cylindrical part of the bracket may also be used as the connecting member. , in this case, becomes a second fitting part that fits into the inner circumferential surface of the brush holder. Further, the first fitting part does not need to be cylindrical, and may be a plurality of arcuate plates or flat plates.
The fitting portion may be a convex portion or a concave portion that fits into a concave portion or a convex portion formed in the annular wall of the brush holder.

In this embodiment, thermosetting resin is used as the material for the brush holder, but metal may be used for the brush holder as long as the brush, bracket, and connecting member are electrically insulated.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main parts of the motor section of a starter for an automobile internal combustion engine employing an embodiment of the present invention, and FIG. 2 is a sectional view of a starter for an automobile internal combustion engine employing an embodiment of the present invention. A plan view showing the main parts of the motor section, FIG. 3 shows a yoke, a bracket, a holder plate,
and an exploded view of the brush holder, etc., Fig. 4 is a cross-sectional view of the connection part between the brush holder and the leaf spring adopting one embodiment of the present invention, and Fig. 5 is a cross-sectional view showing the main parts of the motor section of a conventional small motor. It is a diagram. In the diagram

Claims (1)

[Scope of Claims] 1) (a) A rotating shaft to which a contactor such as a commutator or a slip ring is fixed; (b) a cylindrical portion through which the rotating shaft is rotatably inserted; and an outer circumferential direction of the cylindrical portion. (C) a brush holder that holds a brush that contacts the contact and is electrically connected to the contact; (d) having a first fitting part that fits with the inner circumferential surface of the cylindrical part of the bracket, and a second fitting part that fits with the brush holder; A rotating electrical machine comprising: a connecting member attached to the plate-shaped portion of the bracket.