JPH0543758U - Support structure for brush holder stay in fan motor - Google Patents

Abstract

(57) [Abstract] [Purpose] Vibration of the brush holder stay is prevented to improve motor performance, and wiring is simplified to improve assembly workability. [Structure] A large-diameter brush holder stay 12 having a lead plate wiring 13 on its back surface is formed, and an outer peripheral edge portion of the brush holder stay 12 is supported by abutting with a step portion 14b of an end bracket 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support structure for a brush holder stay in a fan motor such as a radiator fan motor.

[0002]

[Problems to be Solved by Prior Art and Invention]

 Generally, this type of fan motor is provided with a brush protruding from a brush holder, and is configured to drive the motor based on the brush slidingly contacting the commutator on the armature side. Today, however, the life of the fan motor is extended. Therefore, it is proposed to extend the brush length, and in this case, it is necessary to lengthen the brush holder and to form the brush holder stay to which the brush holder is assembled to have a large diameter. In the past, however, the brush holder stay was abutted against a plurality of protrusions protruding from the end bracket to secure the insulation distance, and in this state the riveting was fixed to the end bracket. When the diameter of the brush holder stay is increased, the outer peripheral edge of the brush holder stay is not sufficiently supported, and the vibration of the brush holder stay increases, resulting in variation in commutation by the brush and the motor. There is a fear that the performance may deteriorate. Also, in the past, the lead wire was directly soldered to the brush holder part, and the lead wire was routed along the outer periphery of the brush holder stay and then pulled out to the outside of the motor. There was also the fear that the wiring would be troublesome and the assembly workability would deteriorate.

[0003]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION The present invention was devised with the object of providing a support structure for a brush holder stay in a fan motor that can eliminate these drawbacks in view of the above-mentioned circumstances. In a fan motor in which a disk-shaped brush holder stay to which a holder is attached is fixed to an end bracket that supports the rear end of the motor shaft, the brush holder stay is formed with a large diameter in order to make the brush holder long. Wiring is provided on the back surface of the large-diameter brush holder stay with a thin lead plate, while the outer peripheral edge portion of the brush holder stay is provided with a step portion of the peripheral edge of the recess formed in the end plate facing portion of the end bracket. Brush holder stay steady by contacting and supporting the entire circumference with a lead wire pullout grommet fitted in the end bracket. It is characterized in that the the. With this configuration, the present invention prevents vibration of the brush holder stay to improve the motor performance and simplifies the wiring to significantly improve the assembling workability. It is a thing.

[0004]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a fan motor, a bottomed cylindrical yoke 2 constituting the fan motor 1, a motor shaft 4 having a fan 3 integrally attached to a protruding portion, and a motor shaft 4 integrated with the motor shaft 4. Amaturea core 5 that is fitted externally, an Amateur coil 6 that is wound around the Amateur core 5, a permanent magnet 7 that is adhered to the inner peripheral surface of the yoke 2, a brush 9 that slidably contacts the commutator 8, and the like. However, all of these basic configurations are conventional.

Reference numeral 10 denotes a brush holder for holding the brush 9. The brush holder 10 is formed in a substantially V-shaped cross section so as to accommodate the brush 9 and the brush spring 11, and has a disc-shaped brush. Although a plurality of holder holders 12 are assembled in a radial direction, the brush holder 10 of the present invention is formed to extend in a radial direction to hold the long brush 9, and accordingly, the brush holder stays are formed. 12 also has a large diameter.

Further, 13 is a thin plate-shaped lead plate wiring provided on the back surface of the brush holder stay 12, and the lead plate wiring 13 includes a pigtail 9 a planted in each brush 9, and a brush holder stay 12. In order to electrically connect to the terminal portions 13a centrally arranged at the outer peripheral edge portion of the brush 12, the brush holder stay 12 is arranged at a position avoiding the outer peripheral edge portion on the back surface.

On the other hand, 14 is an end bracket for covering the rear end opening of the yoke 2, and in the end bracket 14, the rear end of the motor shaft 4 is axially supported by a bearing 15 and a brush holder is provided. The stay 12 is fixed by a rivet 16, and the outer peripheral edge of the rivet-fixed brush holder stay 12 is abutted and supported by the end bracket 14. That is, a recess 14a is formed in the center of the rear bracket 14 to secure an insulation distance from the lead plate wiring 13, and a step 14b formed on the periphery of the recess 14a is provided on the outer periphery of the brush holder stay 12. It is designed to touch the edge.

Furthermore, 17 is a lead wire lead-out grommet, and the grommet 17 is fitted into a fitting portion 14c formed in the end bracket 14, and each of the terminal portions 13a is formed. The lead wire insertion holes 17a are formed in parallel so as to guide the lead wires 18 connected to the terminals. The lead wire insertion holes 17a are closely fitted to the respective terminal portions 13a on the inner end side. The terminal accommodating portion 17b is formed. That is, the terminal portion 13a is covered with the grommet 17 to ensure insulation from the end bracket 14, but at this time, since the terminal portion 13a is in contact with the bottom portion of the terminal accommodating portion 17b, the terminal portion 13a is provided. The outer peripheral edge of the brush holder stay 12 is supported in contact with the grommet 17 via the terminal portion 13a, whereby the outer peripheral edge of the brush holder stay 12 is attached to the step portion 14b of the end bracket 14 and the end bracket 14. The grommets 17 that are fitted together are supported and abutted over the entire circumference so that they can be reliably stopped.

In the embodiment of the present invention configured as described above, the brush holder stay 12 having a large diameter for mounting the long brush holder 10 is fixed to the end bracket 14 by revetting. The outer peripheral edge of the brush holder stay 12 guides the lead wire 18 and the peripheral step 14b of the recess 14a formed in the rear bracket 14 in order to secure an insulation distance from the lead plate wiring 13. Since it is abutted and supported over the entire circumference by the grommet 17 fitted in the end bracket 14, the vibration of the brush holder stay 12 is reliably regulated. Therefore, even though the diameter of the brush holder stay 12 is increased, it is possible to reliably prevent the problem that the rectification of the brush 9 is varied due to the vibration of the brush holder stay 12 to significantly improve the motor performance. it can.

Moreover, since the lead wiring of the brush 9 is composed of the thin-plate-shaped lead wiring 13 provided on the back surface of the brush holder stay 12, the lead wire is troublesome to be routed due to the increase in the diameter of the brush holder stay. There is no inconvenience such as that, and the assembly workability can be greatly improved by simplifying the wiring.

Furthermore, since the recess 14a of the end bracket 14 can be simultaneously formed during the press forming of the end bracket 14, the number of steps is not increased.

In addition, in the embodiment, since the riveting fixing points are set to a minimum of two points, the number of parts and the number of assembling steps are not increased due to the increase of the fixing points, which is extremely convenient.

Furthermore, in the embodiment, in order to ensure the insulation between the brush holder stay 12 side and the end bracket 14 side without particularly using an insulating member such as an insulating sheet, the number of members and the number of assembly steps are reduced. be able to.

[0014]

[Operation effect]

 In short, since the present invention is configured as described above, the brush holder stay fixed to the end bracket with the ribet is formed with a large diameter as the brush holder becomes longer, The outer peripheral edge of the holder stay is abutted and supported over the entire circumference by a peripheral edge step of a recess formed in the end bracket facing the lead plate and a lead wire pullout grommet fitted in the end bracket. Therefore, the vibration of the brush holder stay can be effectively regulated. Therefore, it is possible to reliably prevent the problem that the rectification of the brush is varied due to the vibration of the brush holder stay as in the case where the conventional support structure is adopted as it is. A fan motor having a large diameter brush holder stay can significantly improve the motor performance.

Further, since the thin lead plate wiring is provided on the back surface of the brush holder stay, it is possible to use the lead wire based on the larger diameter of the brush holder stay as in the case where the lead wire is directly soldered to the brush holder portion. There is no inconvenience such as troublesome wiring, and the lead wiring can be simplified and the assembly workability can be significantly improved.

Further, the recess formed in the end bracket can be formed simultaneously with the press forming of the end bracket, which is extremely convenient without increasing the number of steps.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fan motor.

FIG. 2 is a front view of the brush holder stay showing an assembled state.

FIG. 3 is a sectional view of the same.

FIG. 4 is a rear view of the brush holder stay.

FIG. 5 is a front view of an end bracket.

[Explanation of symbols]

 1 Fan Motor 9 Brush 10 Brush Holder 12 Brush Holder Stay 13 Lead Board Wiring 14 End Bracket 14a Recess 17 Grommet

Claims (1)

[Scope of utility model registration request] 1. A fan motor comprising a disk-shaped brush holder stay, to which a plurality of radial brush holders are attached, fixed to an end bracket supporting a rear end of a motor shaft by reveting. The brush holder stay is formed to have a large diameter in order to make it large, and wiring is provided on the back surface of the large diameter brush holder stay with a thin lead plate, while the outer peripheral edge of the brush holder stay is opposed to the lead plate of the end bracket. It is characterized in that the stepped peripheral edge of the recess formed in the end portion and the grommet for pulling out the lead wire fitted in the end bracket are contacted and supported over the entire circumference to prevent the brush holder stay from swaying. Support structure for brush holder stay in fan motor.