JPH06178496A - Small sized motor - Google Patents

Abstract

PURPOSE:To obtain a motor easily built with little unevenness of motor performance to improve waterproof by forming an external diameter of a bearing, provided in an end cap, to an external diameter or more of a commutator, and inserting a brush opening jig into a peripheral part of this bearing in a predetermined condition. CONSTITUTION:A bearing 31, mounted to a bearing mounting part 16 formed in an end cap 61 in a side of a holder base 1 of a small-sized motor, is formed of sintered metal, and external, diameter dimension of this bearing is formed to the external diameter or more of a commutator. Inserting parts 33 for inserting brush opening jigs 7, formed of a groove and a hole capable of opening a carbon brush 2 left as stopped, are provided in the number of parts equal to the number of the brushes, in a peripheral part of the bearing 31. Further in the end cap 61, holes, aligned to a position of the carbon brush 2 and the inserting part 33 of the bearing 31, are provided, to press fit the bearing 31 fixed by aligning the inserting part 33 in the peripheral part of the bearing to a hole position of the end cap 61. Accordingly, the carbon brush 2 can be easily held in an opened condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor, and more particularly to a small motor which is easy to assemble and has a good waterproof property.

[0002]

2. Description of the Related Art As shown in FIG. 13, a conventional small motor has a holder base after the magnet 9 and the rotor 4 are assembled in a housing 5 and the carbon brush 2 is opened with a jig or the like. 1 is assembled, the carbon brush 2 is set, and then the end cap 6 is assembled.

[0003]

In the conventional structure described above, the holder base 1 and the end cap 6 must be separately assembled to the housing 5 in which the rotor 4 is assembled.
There was a drawback that assembly efficiency was poor.

As a method for improving the assembling efficiency, the holder base 1 is assembled to the end cap 6 by holding it in front, and the carbon brush 2 attached to the holder base 1 is opened by a jig or the like to finish the end. A method of assembling the cap 6 to the housing 5 can be considered. In this case, a hole through which the brush opening jig is to be inserted must be opened in the end cap 6, and when the outer diameter of the bearing 3 is close to the outer diameter of the commutator 41, the hole cannot be opened. Therefore, the conventional structure has a drawback that it is not possible to adopt the process of previously attaching the holder base 1 to the end cap 6 and assembling the end cap 6 to the housing 5.

Further, since the holder base 1 and the end cap 6 are separately assembled, the power supply portion is designed so that the harness 25 is passed between the cylindrical surface of the housing 5 and the joint surface of the end cap 6 to ensure waterproofness. If required, this part had the drawback that high sealing performance and its reliability could not be obtained.

Further, since the magnet 9 is assembled to the housing 5 before the holder base 1 is fixed to the housing 5, it is necessary to devise an assembly position for the housing 5. Conventionally, as shown in FIG. A part 91 for determining the position is used. Further, the holder base 1 must also be assembled in a determined position with respect to the housing 5, but the angular position of the carbon brush 2 in the phase direction with respect to the magnet 9 is important. Since the positioning is performed by levers, assembly errors are accumulated, and there is a drawback that causes variations in motor performance.

An object of the present invention is to solve the above-mentioned drawbacks, and an object thereof is to provide a small-sized motor which is easy to assemble, has a small variation in motor performance, and has a good waterproof property.

[0008]

In order to achieve the above object, in the present invention, the bearing 31 attached to the bearing mounting portion 16 formed on the end cap 61 on the holder base 1 side of a small motor is made of sintered metal, The outer diameter of the commutator 41
The same number as the number of brushes is provided for inserting the brush opening jig 7 formed by the groove or hole that can open and hold the carbon brush 2 on the outer periphery of the brush having the outer diameter or more. The end cap 61 is provided with a hole matching the position of the carbon brush 2 and the insertion portion 33 of the bearing 31, and the bearing 31 is press-fit by matching the insertion portion 33 of the outer peripheral portion with the hole position of the end cap 61. Fix it.

The holder base 1 is made of an insulating resin molding material and fixed to an end cap 61. The end cap 61 constitutes a bag-shaped housing 5 integrally press-molded with the yoke 51. That is, the holder base 1 is attached to the bottom of the bag-shaped housing 5.

The power supply unit 14 is provided on the holder base 1 and is projected to the outside from a hole 54 provided in the bottom of the housing 5, that is, in the flat portion of the end cap 61. Further, the holder base 1 is provided with a guide 11 for positioning the magnet 9 in the height direction and the angle direction, and further, the housing 5 and the housing 5 can be elastically deformable so as to be able to engage with the protruding portion 52 formed inside the housing 5. The snap-fit portion 12 is provided on the holder base 1 and can be fixed by this.

When waterproofness is required, the seal cap 8 having an elastically deformable snap-fit portion 81 for closing the hole of the end cap 61 is attached to the bearing 31.
It is configured to be attached using the insertion portion 33 on the outer peripheral portion of the.

[0012]

Since the present invention is constructed as described above, the brush opening jig 7 can be inserted from the outside of the end cap 61 through the insertion portion 33 penetrating the end cap 61. Therefore, the carbon brush 2 is opened. It is possible to easily hold the state. The power supply unit 1 is provided on the flat surface of the end cap 61.
Since 4 can be provided, the waterproof structure can be easily configured.

Further, since the holder base 1 is assembled to the housing 5 before the magnet 9 is assembled and the magnet positioning guide 11 is provided on the holder base 1, the assembly work of the magnet 9 is facilitated and the carbon The positional relationship between the brush 2 and the magnet 9 is improved, and variations in motor performance are reduced.

The angular position between the holder base 1 and the end cap 61 is automatically determined by the power supply unit 14, and the holder base 1 is fixed to the housing 5 by pressing it with the snap fit unit 12. Therefore, the holder base 1 can be easily assembled into the housing 5.

Since the seal cap 8 for waterproofing or dustproofing is fixed by using the insertion portion 33 into which the brush opening jig 7 is inserted, the seal structure can be easily formed on the outer circumference of the bearing mounting portion of the end cap 61. Can be configured.

[0016]

1 is a sectional view of an embodiment of a small motor according to the present invention, FIG. 2 is a right side view of the small motor according to the present invention, and FIG.
1 to 3 which are left side views of the inside of the housing when the rotor is removed and the carbon brush is opened from the opening of the housing, the cylindrical yoke 51 and the end cap 61 are integrally press-molded into a bag shape. And constitutes the housing 5. The magnet 9 is fixed to the inner circumference of the yoke 51 by adhesion or the like. The bearing mounting portion 1 is provided at the center of the end cap 61 that constitutes the right end of the housing 5.
6 is formed, and the right end of the bearing mounting portion 16 is opened. A bearing 31 made of a sintered alloy is press-fitted and fixed to the bearing mounting portion 16.

The opening side of the housing 5 is closed by an end cap 62 to which a bearing 32 such as a deep groove ball bearing is fixed, and the bearing 32 and the bearing 31 on the end cap 61 side rotate. The child 4 is pivotally supported. The rotor 4 is equipped with a commutator 41 and an output shaft 42.
, Detailed shapes of the magnet wire, the commutator 41, etc. are omitted.

End cap 61 inside the housing 5
The holder base 1 is attached to the side, and the holder base 1 is attached.
Is equipped with a brush base 1, a brush holder 23, a carbon brush 2, and a brush spring 24. The holder base 1 is provided with a magnet positioning guide 11 as shown in FIGS. In FIG. 3, the magnet 9 is drawn by a chain line.

As shown in FIG. 2, a hole 54 for power supply is formed in the end cap 61, and the power supply section 14 formed in the holder base 1 through the hole 54 is shown in FIG. It is protruding like this.

FIG. 5 is a sectional view taken along line AA of FIG.
A terminal 22 integrally formed with the brush base 21 is disposed in the power supply unit 14. The brush base 21 is electrically connected to the carbon brush 2 housed in the brush holder 23, and the terminal 2
The power is supplied from the harness 25 connected to 2. When waterproofing is required, the joint portion 15 between the terminal 22 and the harness 25 is shielded with resin or the like.

A bearing 31 press-fitted and fixed in the bearing mounting portion 16.
The outer diameter of the commutator 41 is equal to or larger than that of the commutator 41, and the outer peripheral portion of the commutator 41 has an insertion portion 33 for inserting the brush opening jig 7 in the axial direction. A plurality is formed. The number of the insertion portions 33 and the formation position thereof are associated with the number of brushes of the commutator 41 and the arrangement position thereof.

FIG. 10 shows a front view of an embodiment of the bearing, and FIG. 11 shows a side view thereof, showing the case where the insertion portion 33 is a groove, and when the outer diameter of the bearing 31 is large, even if it is a hole. Good.

The alternate long and short dash line in FIG. 11 shows the assembled state of the end cap 61 and the seal cap 8 described later. FIG. 8 shows a shape explanatory view of an embodiment of the bearing mounting portion before mounting the seal cap.

The end cap 61 forming the bearing mounting portion 16 is provided with a hole in the center thereof, and in this embodiment, since there are four brushes, a long hole is formed in a cross shape. The hole and the insertion portion 33 of the bearing 31 shown in FIG. 8 are aligned with each other. On the contrary, as will be described later, the bearing 31 is mounted on the bearing mounting portion 16 so that the insertion portion 33 of the bearing 31 is aligned with the elongated hole formed in the end cap 61.
It is press-fitted and fixed in.

As can be seen from this description, the insertion portion 33 of the bearing 31 is attached to the end cap 61 forming the bearing mounting portion 16.
It suffices if holes are provided at the positions corresponding to.
FIG. 9 shows another embodiment of the bearing mounting portion before the seal cap is attached. In the case of the same drawing, the end surface of the bearing 31 is entirely open.

FIG. 6 shows a shape explanatory view of one embodiment in the CC cross section of FIG. An elastic snap-fit portion 12 of the same shape is provided on the outer peripheral portion of the holder base 1 so as to engage with a protruding portion 52 provided on the yoke 51.

FIG. 7 shows a shape explanatory view of another embodiment in the CC cross section of FIG. Also in the case of the same drawing, an elastic snap-fit portion 13 of the same drawing is provided on the outer peripheral portion of the holder base 1 so as to engage with the protruding portion 52 provided on the yoke 51.

6 and 7, the snap-fit parts 12 and 13 provided on the holder base 1 are pushed in the direction of the arrow in the figure to engage with the protruding parts 52 of the yoke 51, respectively. Each holder base 1 is securely fixed to the housing 5.

The small motor shown in FIG. 1 is assembled as follows. The insertion portion 33 of the bearing 31 is positioned and pressed into the bearing mounting portion 16 of the housing 5 so as to match the position of the carbon brush 2.

After mounting the bearing 31, the carbon brush 2,
Brush base 21, terminal 22, brush holder 2
3, The holder base 1 provided with the brush spring 24 is assembled to the end cap 61 of the housing 5. At the time of this assembling, the power supply portion 14 of the holder base 1 is fitted into the hole 54 provided in the end cap 61, so that the snap fit portion 12 and the yoke 51 provided on the outer periphery of the holder base 1 are formed. The position where the protruding portion 52 coincides with the protruding portion 52. Snap fit part 12 to end cap 61
Then, the holder base 1 is fixed inside the end cap 61 of the housing 5. At this time, if the carbon brush 2 is opened by a cylindrical jig having the same outer diameter as the commutator 41, the brush opening jig 7 can be easily inserted later.

Next, the magnet 9 is positioned by the magnet positioning guide 11 of the holder base 1 and fixed to the yoke 51 with an adhesive or the like. Since the positional relationship between the magnet 9 and the carbon brush 2 is determined only through the holder base 1, the magnet 9 is fixed with high precision, and no unique component for positioning the magnet 9 is required.

As shown in FIG. 4, the brush opening jig 7
Is externally mounted to the bearing mounting portion 16 via the insertion portion 33, and the carbon brush 2 is held in an open state. Under such a state, the rotor 4 in which the end cap 62 and the rotor 4 are assembled is assembled in the yoke 51. At this time, the brush opening jig 7 is pushed out by the commutator 41, and the carbon brush 2 is set on the commutator 41. After that, the end cap 62 and the yoke 51 are fixed.

After completely removing the brush opening jig 7,
The snap fit portion 81 formed on the seal cap 8 shown in FIG. 12 is inserted into the insertion portion 33 of the bearing 31 and locked, and the seal cap 8 is assembled into the bearing mounting portion 16.

In this embodiment, the drain cap 53 is provided as shown in FIG. 1 to provide a simple waterproof structure. However, when a complete waterproof function is required, the sealing surface is entirely flat or flat by constructing as described above. Since it is composed of a circumferential surface, it can be easily handled.

Further, in the above description, the side of the end cap 62 is described as the opening of the housing 5, but the side of the end cap 61 may be the opening of the housing 5.

[0036]

As described above, according to the present invention, the carbon brush is opened by using the penetrating insertion portion, that is, the groove or the hole, for the brush opening jig provided on the outer peripheral portion of the bearing, and the holder base is further opened. Since it is made of an insulating resin material and has a role in assembling, (1) Positioning and assembling of the holder base and magnet is easy, parts and processing for positioning only are not required, and cost can be reduced. Becomes (2) The power supply unit can have a simple structure and the cost can be reduced. (3) Since the waterproof sealing surface can be entirely formed of a flat surface or a circumferential surface, a motor having a high waterproof property can be formed. (4) The opening of the housing can be easily assembled from either the commutator side or the opposite side.

There are effects such as the following.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a small motor according to the present invention.

FIG. 2 is a right side view of the small motor according to the present invention.

FIG. 3 is a left side view of the inside of the housing when the rotor is removed and the carbon brush is opened as viewed from the housing opening.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an explanatory view of the shape of one embodiment in the CC cross section of FIG. 3;

FIG. 7 is a shape explanatory view of another embodiment in a CC cross section of FIG. 3;

FIG. 8 is an explanatory view of an embodiment of the bearing mounting portion before mounting the seal cap.

FIG. 9 is a shape explanatory view of another embodiment of the bearing mounting portion before mounting the seal cap.

FIG. 10 is a front view of an embodiment of the bearing.

11 is a side view of FIG.

FIG. 12 is a partial sectional view of an embodiment of the seal cap.

FIG. 13 is a partial cross-sectional view of a conventional small motor.

[Explanation of symbols]

 1 Holder base 2 Carbon brush 4 Rotor 5 Housing 7 Brush opening jig 8 Seal cap 9 Magnet 11 Magnet positioning guide 12, 13 Snap fit part 14 Power supply part 16 Bearing mounting part 21 Brush base 22 Terminal 31, 32 Bearing 33 Insert Part 41 commutator 51 yoke 52 projecting part 54 hole 61, 62 end cap 81 snap fit part

Claims (6)

[Claims] 1. A yoke (5) having a magnet (9).
1), a rotor (4) having a commutator (41), and bearings (31, 3) for closing both ends of the yoke (51), respectively.
2) provided with an end cap (61, 62), a holder base (1) fixed to one end cap (61), and a carbon brush (2) attached to the holder base (1) In the small motor, the outer diameter of the bearing (31) provided on the end cap (61) on the side where the holder base (1) is fixed is at least larger than the outer diameter of the commutator (41). In addition, the outer peripheral portion of the bearing (31) has a penetrating insertion portion (3) for inserting the brush opening jig (7) in the axial direction of the rotor (4).
A small motor characterized in that 3) is provided corresponding to the carbon brush (2). 2. The small motor according to claim 1, wherein the end cap (6) provided with the holder base (1).
A hole (54) for power supply is provided in the flat portion of 1), the holder base (1) is made of an insulating resin material, and the end cap (6) is attached to the holder base (1).
A power supply part (14) protruding from a power supply hole (54) provided in the flat part of 1) is formed, and the power supply part (14) is integrally formed with the brush base (21). A small motor having a terminal (22). 3. The small motor according to claim 1, wherein the yoke (51) and one of the end caps (61, 62) constitute a housing (5) integrally formed in a bag shape. Small motor characterized by. 4. The small motor according to claim 3, wherein the end cap (6) provided with the holder base (1).
1) is formed in a bag shape integrally with the yoke (51) to form a housing (5), the holder base (1) is made of an insulating resin material, and the holder base (1) has a magnet (9). A small motor characterized by being provided with a magnet positioning guide (11) for positioning. 5. The small motor according to claim 3, wherein the end cap (6) provided with the holder base (1).
1) is integrally formed with the yoke (51) in a bag shape to form a housing (5), the holder base (1) is made of an insulating resin material, and the holder base (1) has an outer peripheral portion. A plurality of elastically deformable snap fit portions (12) are provided, and a protruding portion (5) of the housing inner surface that engages with the snap fit portion (12) is provided on the inner surface of the housing (5).
2) is provided, and the holder base (1) is provided through the engagement between the snap fit portion (12) and the protruding portion (52) on the inner surface of the housing.
A small motor, characterized in that it is fixed to the housing (5). 6. The miniature motor according to claim 1, wherein a plurality of elastically deformable snap fit portions (81) are provided.
Is provided with a seal cap (8) formed at a position corresponding to the insertion portion (33) for inserting the brush opening jig (7) provided in the bearing (31), and the seal cap (8) A small motor having a structure in which the opening of the end cap (61) is closed.