JPH0644362U - Motor brush holder holding structure - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a brush holder holding structure for a motor, which has a small number of parts, is easy to assemble, and is excellent in vibration resistance. [Structure] A plurality of projecting portions 15 having locking portions 16 extending toward the outer side of the diameter on the free end side are formed on the end frame 14 toward the end bracket side. A connecting portion 21 formed as a recessed notch is formed at a position aligned with the plurality of protruding portions 15, and the rubber member 13 that engages with the connecting portion 21 and is externally fitted to the protruding portion 15 is used as the locking portion 16. The base end portion 1 of the protruding portion 15
The end frame 14 and the end bracket 12 are connected by being press-fitted on the 5a side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brush holder holding structure for a motor, and more particularly to a brush holder holding structure for a motor having a vibration isolation structure.

[0002]

[Prior art]

 Conventionally, in a motor brush device, there is a technology in which an end bracket to which a brush holder is attached is attached to an end frame.However, in order to position and prevent rotation of the brush, an uneven notch is provided in the end frame and the end bracket. Positioning is performed by fitting these concaves and convexes. However, direct contact between the end bracket and the end frame may cause inconvenience due to vibration, etc. Therefore, an insulating member such as rubber is placed between the end frame and the end bracket (or the fixing member of the brush holder). A technique using a structure having so-called vibration resistance and insulation is known (see, for example, Japanese Patent Laid-Open No. 4-165936).

[0003]

[Problems to be solved by the device]

 In the above-mentioned prior art, since a fastener such as a rivet is used via a bush, there is a problem that the assembly work of the end bracket (or the fastener of the brush holder) and the end frame becomes complicated. However, there was a problem that the number of parts would increase.

An object of the present invention is to provide a brush holder holding structure for a motor, which has a small number of parts, is easy to assemble, and has excellent vibration resistance.

[0005]

[Means for Solving the Problems]

 A brush holder holding structure for a motor according to the present invention comprises a brush holder holding structure having an end bracket having a brush holder and an end frame holding the end bracket via an elastic member. Has a plurality of protrusions having locking portions extending toward the outer side of the diameter on the free end side toward the end bracket side, and the end brackets are aligned with the plurality of protrusions. A connecting portion having an engaging portion that engages with the elastic member is formed at a position where the elastic member that engages with the connecting portion and is externally fitted to the protruding portion is protruded from the locking portion. The end frame and the end bracket are connected by being press-fitted to the base end side of the section.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The parts, arrangements, etc. described below do not limit the present invention and can be variously modified within the scope of the present invention.

1 to 3 show an embodiment of the present invention. FIG. 1 is a sectional view of a motor, FIG. 2 is a plan view of a brush holder holding structure, and FIG. 3 is a line AA of FIG. FIG. As shown in FIG. 1, the motor M of this example includes an armature 1, a stator 2, and a commutator 3, and an output shaft 5 extends at one end side through a bearing portion 4. A brush holder holding structure 10 is arranged on the other end side.

The brush holder holding structure 10 of the present example includes an end bracket 12 having a brush holder 11 and an end frame 14 holding the end bracket 12 via an elastic member 13. A required number (three in this example) of protrusions 15 are formed on the end frame 14 of this example toward the end bracket 12 side. A locking portion 16 is formed on the free end side of the projection 15 and extends outward in the radial direction.

Further, the end bracket 12 is formed with a disposition hole 12a for disposing the commutator 3 in the center thereof, and the brush holder 11 is disposed so as to face each other through the disposition hole 12a. A brush 17 is arranged in the brush holder 11, and the brush 17 is biased toward the commutator 3 side by a spring 18. Note that reference numeral 19 in FIG. 2 is a pigtail connected to the brush 17. The end bracket 12 of this example is provided with a connecting portion 21 formed as a concave notch at a position aligned with the plurality of protrusions 15. The connecting portion 21 engages with the elastic member 13 described below.

The elastic member 13 of this example is composed of a hollow cylindrical rubber member 13 in which a connecting hole 13a is formed. The inner diameter of the rubber member 13 is substantially the same as the outer diameter of the protruding portion 15, and the height of the rubber member 13 is substantially the same from the base end portion 15a of the protruding portion 15 to the locking portion 16. Same height. Further, an engagement groove 13b having the same width as the plate thickness of the end bracket 12 is circumferentially formed at a predetermined position on the outer circumference of the rubber member 13.

The brush holder holding structure 10 having the above structure is assembled in the following manner. First, the rubber member 13 is assembled to the end frame 14, and this assembly is carried out by aligning the engaging groove 13b with the connecting portion 21, which is a concave cutout, and attaching the same. Next, the protrusion 15 formed on the end bracket 12 is press-fitted into the connecting hole 13 a of the rubber member 13. At this time, the rubber member 13 is connected by press-fitting from the locking portion 16 to the base end portion 15a side of the projection portion 15.

[0012]

[Effect of device]

 As described above, according to the present invention, the end frame is formed with a plurality of protrusions having locking portions extending outward in the radial direction on the free end side toward the end bracket side. The bracket is formed with a connecting portion having an engaging portion that engages with the elastic member at a position aligned with the plurality of protrusions, and engages with the connecting portion and is externally fitted to the protrusion. Since the end frame and the end bracket are connected by press-fitting the elastic member to the base end side of the protrusion from the locking part, the end bracket is press-fitted to the protrusion of the end bracket via the elastic member. It can be assembled only by itself, the locking part can prevent it from coming off, the number of parts is small, and the assembly is easy. Further, the elastic member can absorb the vibration in the vertical direction and the horizontal direction as well as the positioning of the end bracket, and thus it is possible to provide the brush holder holding structure of the motor having excellent vibration resistance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a motor having a brush holder holding structure according to the present invention.

FIG. 2 is a plan view of a brush holder holding structure.

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

[Explanation of symbols]

 10 Brush Holder Holding Structure 11 Brush Holder 12 End Bracket 13 Elastic Member (Rubber Member) 13a Connection Hole 13b Engagement Groove 14 End Frame 15a Base End 15 Projection 16 Locking Part 17 Brush 18 Spring M Motor

Claims (1)

[Scope of utility model registration request] 1. A brush holder holding structure comprising an end bracket having a brush holder and an end frame holding the end bracket through an elastic member, wherein the end frame has a diameter outside on a free end side. A plurality of protrusions having locking portions extending in the direction are formed toward the end bracket side, and the end bracket engages with the elastic member at a position aligned with the plurality of protrusions. A coupling portion having a mating portion is formed, and the elastic member that engages with the coupling portion and is externally fitted to the protrusion is press-fitted to the base end side of the protrusion from the locking portion, A motor brush holder holding structure in which the end frame and the end bracket are connected.