JP2001112209A - Structure for floating attachment of brush holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for floating attachment of brush holder which can make work easier at the time of incorporating a brush holder in a motor by floating the holder and, at the same time, can reduce the size of the motor. SOLUTION: A plurality of projecting sections 21 having circular cross sections are protruded in the radial direction from a substrate 14 provided with a brush guide member 16 which guides and supports a brush 17 and, at the same time, rubber tubes 22 are slid on the projecting sections 21. The substrate 14 is supported in such a way that the projecting sections 21 carrying the rubber tubes 22 are inserted into recessed sections 25 which are formed on the ribs 26 and 23 of at least either one of a yoke 11 and a housing 12 and having arcuate shapes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holder floating mounting structure.

[0002]

2. Description of the Related Art Conventionally, when a brush holder 51 is mounted in a floating state on a motor, FIGS.
As shown in the figure, the brush holder substrate 52 is connected to the yoke 54 via an elastic member 53 attached to the substrate end 52a.
And the housing 55.

[0003]

However, the elastic member 5
3 is a brush holder board 52 located further outside the brush guide member 56 provided on the brush holder board 52.
At the substrate end 52a. For this reason, the brush holder 51 to which the elastic member 53 is attached has been increased in size, which has led to an increase in the size of the motor.

[0004] A substrate end 5 of the brush holder substrate 52 is also provided.
The cross section 2a has a rectangular shape, and the concave section 53a of the elastic member 53 attached to the substrate end 52a also has a rectangular cross section. Therefore, when attaching the elastic member 53 to the brush holder substrate 52, it is not easy to insert the substrate end 52a into the concave portion 53a.

The outer edge 53b of the elastic member 53 and the housing 55a of the housing 55 also have a rectangular cross section. Therefore, when the brush holder 51 to which the elastic member 53 is attached is attached to the housing 55, the outer edge 53 is attached.
The work of inserting b into the accommodation portion 55a was not easy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to facilitate the work of assembling a brush holder in a floating state by floating the brush holder and to reduce the size of the motor. It is an object of the present invention to provide a brush holder floating mounting structure that can be used.

[0007]

In order to solve the above-mentioned problems, the invention according to the first aspect is directed to a brush holder substrate provided with a brush guide member for guiding and supporting a brush. A plurality of projecting portions having a shape, a resilient member is externally fitted on the protruding portion, and a protruding portion on which the resilient member is externally fitted is formed on at least one of both the connecting and fixing portions of the yoke and the housing. The gist of the invention is to fit and support the fitting concave portion having the arc-shaped surface.

According to a second aspect of the present invention, in the brush holder floating mounting structure according to the first aspect, the convex portion on which the elastic member is externally fitted is a fitting concave portion formed on a yoke connection fixing portion of the housing. When the housing and the yoke are connected and fixed to each other, one side of the protrusion that externally fits the elastic member fitted into the fitting recess is supported by the housing connection fixing portion of the yoke. Make a summary.

According to a third aspect of the present invention, in the floating mounting structure for a brush holder according to the first or second aspect, the protrusion is arranged between the brush guide members.

(Operation) According to the first aspect of the present invention,
A convex portion having a circular cross section protruding in the radial direction with respect to the brush holder substrate is formed on at least one of the connection fixing portions of the yoke and the housing via an elastic member fitted to the convex portion. Is fitted and supported in the fitting concave portion having the surface. That is, since a convex portion having a circular cross section in which the elastic member is externally fitted is inserted and fitted into the fitting concave portion, the work of inserting the convex portion is easily performed. In addition, since the convex portion on which the elastic member is fitted is formed so as to protrude radially from the brush holder substrate, the diameter of the entire brush holder does not increase.

According to the invention described in claim 2, according to claim 1,
In addition to the operation of the invention described in the above, the convex portion externally fitted with the elastic member is fitted into a fitting concave portion formed in the yoke connection fixing portion of the housing, and when the housing and the yoke are connected and fixed, the fitting is performed. One side of the projecting portion, into which the elastic member fitted into the mating recess is fitted, is supported by the housing connection fixing portion of the yoke. In other words, the convex portion on which the elastic member is fitted is prevented from dropping out of the fitting concave portion.

According to the third aspect of the present invention, the convex portion is
It is arranged between the brush guide members having a high degree of freedom in using space. Between the brush guide members, a concave portion which is depressed toward the center of the substrate can be formed on the outer peripheral portion of the brush holder substrate. The convex portion can be formed so that the distal end of the convex portion does not protrude from the outer peripheral portion of the substrate outward from the deep end portion of the concave portion in the radial direction of the substrate. That is, the protrusion does not exist on the outer peripheral portion of the brush holder substrate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 2, the motor 1 includes a yoke 11, a housing 12, and a brush holder 13 provided inside the motor 1 by both.

As shown in FIG. 1, the brush holder 13 is a brush holder substrate (hereinafter simply referred to as a substrate) made of synthetic resin.
14 is provided. The substrate 14 has an annular shape having a hole 15 for disposing a commutator (not shown) at the center thereof. On the surface of the substrate 14 (the front side in FIG. 1), a plurality of brush guide members 16 are integrally formed at positions facing each other with the hole 15 as a center.

Each of the brush guide members 16 is formed in a gate shape, and a brush 17 is supported inside thereof so as to be guided in the direction of the hole 15. The brush 17 has a substantially rectangular parallelepiped shape, and a pigtail 17a is connected to one side thereof.

A spring support pin 18 is provided upright on the surface of the substrate 14 near the brush guide member 16. As shown in FIG. 3, a coil torsion spring 19 is supported by the spring support pin 18, and the brush 17 is urged by the coil torsion spring 19 in the direction of the hole 15 in which the commutator is arranged. It has become.

As shown in FIG. 1, each brush guide member 1
A power supply plate 20 is provided on the back side of the brush guide member 6 so as to cover the back side of the brush guide member 16.
The power supply plate 20 is formed by bending a connecting piece 20a provided on the power supply plate 20 on the surface of the substrate 14 through a mounting hole 14a penetrating the substrate 14, and is fixed to the substrate 14. . The holding portion 20b formed on the power supply plate 20 protrudes from the surface through a hole 14b formed through the substrate 14, and is connected to the tip of the pigtail 17a. A power supply piece 20c to which a current is input is formed on one of the plurality of power supply plates 20.

Accordingly, the brush 17 is prevented from dropping to the back side of the substrate 14 by the power supply plate 20. Four protrusions 21 are provided at equal intervals on the outer peripheral portion of the substrate 14 so as to extend in the radial direction. The convex portion 21 has a columnar shape, that is, a circular cross section, and the diameter thereof is set smaller than the thickness W1 of the substrate 14 in the axial direction (vertical direction in FIG. 2). A cylindrical rubber tube 22 as an elastic member is fitted on the convex portion 21 so as to cover the convex portion 21.

The housing 12 is made of a synthetic resin and has a substantially cylindrical shape with a bottom and an opening as shown in FIG. A rib 23 as a yoke connection fixing portion protruding in the radial direction is formed on the periphery of the opening of the housing 12. At the entrance of the opening of the housing 12, a substrate accommodating recess 24 is provided. The inner diameter of the substrate housing recess 24 is set slightly larger than the outer diameter of the substrate 14 so that the substrate 14 can be housed in a floating state.

As shown in FIG. 3, four fitting recesses 25 are provided at equal intervals around the periphery of the substrate housing recess 24 so as to extend in the radial direction. As shown in FIG. 4, the fitting recess 25 has a width (a circumferential width of the substrate 14,
The width (the width in the left-right direction in FIG. 4) and the depth (the depth in the up-down direction in FIG. 4) are formed to be substantially equal to the outer diameter of the rubber tube 22 fitted on the projection 21 of the substrate 14. The bottom of the fitting recess 25 has a semicircular cross section. That is, it is formed so as to have an arc-shaped surface.

Therefore, when the substrate 14 is accommodated in the substrate accommodating concave portion 24, the convex portion 21 with the rubber tube 22 fitted externally is fitted into the fitting concave portion 25. At this time, a part of the outer periphery of the rubber tube 22 is in close contact with an arc-shaped surface formed at the bottom of the fitting recess 25.

Note that, as shown in FIG.
The depth of 4 (the depth in the vertical direction in FIGS. 2 and 5) is set so that the substrate 14 does not come into contact with the substrate. As a result, the substrate 14, that is, the brush holder 13, is housed in the substrate housing recess 24 in a floating state.

As shown in FIG. 2, a metal yoke 11
Has a substantially bottomed cylindrical shape having an opening below. A rib 26 as a housing connection fixing portion is formed around the opening edge of the yoke 11 so as to protrude in the radial direction. The yoke 11 is arranged so that its opening covers the opening of the housing 12, and the rib 26 is fastened to the rib 23 of the housing 12 by a bolt (not shown) so as to be tightly fixed.

The inner diameter of the opening of the yoke 11 is
It is formed slightly larger than the outer diameter of. As a result, when the yoke 11 and the housing 12 are connected and fixed, as shown in FIGS.
Are fitting recesses 2 formed in the ribs 23 of the housing 12.
5 and one side of the projection 21 is attached to the yoke 1.
The substrate 14, that is, the brush holder 13, is accommodated in the motor 1 in a floating state.

Next, the features of the above embodiment will be described below. (1) In the above embodiment, the diameter of the convex portion 21 protruding from the outer peripheral portion of the substrate 14 is set to be smaller than the thickness W1 of the substrate 14, and the convex portion 21 has a rubber tube as an elastic member. 22 was externally fitted. That is, the outer shape of the elastic member for floatingly supporting the brush holder 13 is reduced. Accordingly, since the ribs 26 and 23 of the yoke 11 and the housing 12 that support the convex portion 21 with the rubber tube 22 fitted outside can be reduced, the motor 1 can be downsized.

(2) In the above embodiment, the convex portion 21 of the substrate 14 is formed in a circular cross section, and the rubber tube 22 fitted to the convex portion 21 is cylindrical, that is, the outer shape is circular in cross section. That is, the convex portion 21 having a circular cross section is inserted into the rubber tube 22, and the rubber tube 22 having a circular outer cross section is similarly inserted into the fitting concave portion 25 of the housing 12. Therefore, each of the insertion operations is facilitated, so that the operation of assembling the brush holder 13 to the housing 12, that is, the motor 1 can be facilitated.

(3) In the above embodiment, the cylindrical rubber tube 22 is used as the elastic member fitted to the projection 21 of the substrate 14. The cylindrical rubber tube 22 has high versatility and is easily available, so that the cost can be reduced.

The above embodiment may be modified as follows. In the above embodiment, the concave portion into which the convex portion 21 into which the rubber tube 22 is externally fitted is fitted to the fitting concave portion 25 provided in the housing 12.
The yoke 11 is not provided with a concave portion into which the convex portion 21 is fitted.
A concave portion into which the convex portion 21 is fitted may be provided in both of them, and each may support the convex portion 21. In this case, the fitting recess 25 of the housing 12 can be reduced, so that the rib 23 of the housing 12 can be reduced.

In the above embodiment, the projection 21 of the substrate 14
Is assumed to be cylindrical, but may be formed in a conical shape or a truncated conical shape so as to become thinner toward the tip. In this case, if the shapes of the rubber tube 22 and the fitting concave portion 25 are made to correspond to each other, an operation of inserting the convex portion 21 into the rubber tube 22 and an operation of inserting the convex portion 21 with the rubber tube 22 fitted outside into the fitting concave portion 25. Becomes even easier.

In the above embodiment, the projection 21 of the substrate 14
Although four fitting recesses 25 of the housing 12 are provided, three or five or more fitting recesses 25 may be provided, for example.

In the above embodiment, one rubber tube 22 is fitted to each of the four protrusions 21 provided on the substrate 14, but as shown in FIG. A rubber damper 27 in which four cylindrical rubber pipe portions 27b extending in the radial direction are integrally formed on the outer periphery of a rubber ring 27a having an inner diameter may be used. An inner hole 27c of the rubber tube 27b provided in the rubber damper 27 is formed to penetrate the rubber ring 27a and the rubber tube 27b. The rubber damper 27 is a rubber
The rubber ring 27a is mounted so that the outer periphery of the substrate 14 is surrounded by the rubber ring 27a such that b is fitted to the projection 21 of the substrate 14. On the other hand, in order for the brush holder 13 on which the rubber damper 27 is mounted to be supported in a floating state, the inner diameter of the substrate receiving recess 24 of the housing 12 and the inner diameter of the opening of the housing 12 are mounted on the outer peripheral portion of the substrate 14. It must be formed larger than the outer diameter of the rubber ring 27a. In this case, the number of parts can be reduced.

In the above embodiment, the protrusion 21 is
Although the brush holder 13 formed so as to protrude outward in the radial direction on the outer peripheral portion is used, a brush holder 30 as shown in FIG. 7 may be used. Substrate 31 of brush holder 30
Is formed with a concave portion 32 depressed radially inward in the outer peripheral portion thereof. The recess 32 avoids a position of a plurality of brush guide members 31 a provided in the brush holder 30 on the radial outside of the substrate 31, and has a high degree of freedom in space utilization between the brush guide members 31 a. Are located. Substrate 31
A protruding portion 33 having a circular cross section is provided so as to extend in the radial direction. A cylindrical rubber tube 34 is fitted on the projection 33. In the above-described embodiment, the fitting recess 25 is provided on the periphery of the substrate housing recess 24 so as to extend radially outward. However, when the brush holder 30 is installed in the motor 1, the rubber tube 34 is externally fitted. The fitting concave portion (not shown) in which the convex portion 33 is fitted needs to be formed to be shifted radially inward of the substrate accommodating concave portion 24. In this case, the brush holder 30 can be set to have the outer dimensions of the brush holder 13 from which the protrusions 21 are omitted. Therefore, the size of the motor 1 can be reduced.

Next, technical ideas other than those described in the claims which can be understood from the above embodiment and other examples will be described below together with their effects. (1) In the floating mounting structure for a brush holder according to any one of claims 1 to 3, the elastic member is formed in a cylindrical shape, and is individually fitted to the plurality of protrusions. A floating mounting structure for the brush holder. In this case, versatility is high and acquisition is easy, so that cost can be reduced.

(2) In the floating mounting structure of the brush holder according to claim 1 or 2, the elastic member includes a pipe portion individually fitted to the plurality of convex portions. The floating mounting structure of the brush holder, wherein the portions are connected and integrally formed by a connecting portion. In this case, the number of parts can be reduced.

[0035]

As described above in detail, according to the first aspect of the present invention, the operation of assembling the brush holder in the motor while floating the brush holder can be facilitated, and the motor can be downsized.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the brush holder can be reliably floated and supported by both the connection fixing portions of the yoke and the housing.

According to the invention described in claim 3, according to claim 1
Alternatively, in addition to the effect of the invention described in claim 2, the motor can be further reduced in size.

[Brief description of the drawings]

FIG. 1 is a plan view showing a brush holder according to the embodiment.

FIG. 2 is an exploded sectional view showing a floating mounting structure of the brush holder.

FIG. 3 is a plan view showing a state where the brush holder is assembled to a housing.

FIG. 4 is a sectional view taken along line AA in FIG. 3;

FIG. 5 is a sectional view taken along line BB in FIG. 3;

FIG. 6 is a plan view showing another example of an elastic member according to the embodiment.

FIG. 7 is a schematic plan view showing another example of a brush holder according to the embodiment.

FIG. 8 is a partially enlarged cross-sectional view showing a floating attachment structure of a brush holder according to the related art.

FIG. 9 is a partially enlarged plan view showing a floating mounting structure in a state where a yoke of a brush holder is removed in a conventional technique.

[Explanation of symbols]

11: yoke, 12: housing, 13, 30: brush holder, 14, 31: brush holder substrate, 16: brush guide member, 17: brush, 21, 33 ... convex portion, 22,
34: a rubber tube as an elastic member; 23, 26: a rib as a connecting and fixing portion; 25: a fitting concave portion; 27: a rubber damper as an elastic member.

Claims (3)

[Claims] A brush holder substrate provided with a brush guide member for guiding and supporting a brush is formed with a plurality of protrusions having a circular cross section in a radial direction, and an elastic member is externally fitted to the protrusions. The convex portion externally fitted with the elastic member is fitted to and supported by a fitting concave portion having an arc-shaped surface formed on at least one of the two connection fixing portions of the yoke and the housing. Brush holder floating mounting structure. 2. The floating mounting structure for a brush holder according to claim 1, wherein the convex portion externally fitted with the elastic member is fitted into a fitting concave portion formed in a yoke connection fixing portion of the housing. Wherein when the and the yoke are connected and fixed, one side of the protrusion which externally fits the elastic member fitted into the fitting recess is supported by a housing connection fixing portion of the yoke. Mounting structure. 3. The floating mounting structure for a brush holder according to claim 1, wherein the projection is disposed between brush guide members.