CN86106490A

CN86106490A - The brushgear of miniature motor

Info

Publication number: CN86106490A
Application number: CN198686106490A
Authority: CN
Inventors: 马渊隆一
Original assignee: Mabuchi Motor Co Ltd
Current assignee: Mabuchi Motor Co Ltd
Priority date: 1985-09-26
Filing date: 1986-09-23
Publication date: 1987-04-08
Also published as: GB2180999A; GB8623195D0; KR900002355Y1; KR870005920U; GB2180999B; JPS6257568U

Abstract

The brushgear of the miniature motor of being made up of brush arm and brush bearing, brush arm have with commutator and constitute the brush part that electrically contacts, and the brush bearing has and passes the motor case lid, drawn the terminal portions as aerial lug; Brush arm is connected in overlapping mode with the brush bearing; Brush part is supported by the motor case lid, and is suitable for electrically contacting with commutator formation; In this brushgear, be provided with the line of rabbet joint at the root of brush arm, prolonging the effective length of brush arm, and be provided with bending section, to reinforce the root of brush arm at the end of brush arm root.

Description

The brushgear of miniature motor

In general, the present invention relates to the improvement of small motor brush device; More particularly, it relates to the brushgear of the miniature motor that is made of brush arm and brush bearing, and brush arm has the brush part that electrically contacts with the motor commutator, and the brush bearing has and passes motor case lid and draw binding post as aerial lug; Brush arm is connected in overlapping mode with the brush bearing; Brush part is supported by the motor case lid, is used for electrically contacting with the commutator formation of motor; In this brushgear, the root of brush arm has grooving, and there is sweep the termination of brush arm root.

In miniature motor, require brush with the commutator sliding contact in, for the rotor of motor provides stable electric current.This means, brush must keep following reliably always the rotation of commutator needed, give fixed contact pressure and contact area.For this purpose, must be with resilient made brush, with the thickness that guarantees to approach with give fixed length.Terminology used here " gives measured length " can be thought from fulcrum, and promptly the standing part of brush is to the length of brush and commutator contact portion; Make brush can follow the required length of rotation of commutator reliably in other words; It is effective length that usually mention in this specification, brush.Therefore,, be used for the brush of this class miniature motor so far, have the brush arm of holding sweep, with the length of remaining valid as what can see in the example of following prior art.

Fig. 1 (A), (B), (C) are the figure that assists the traditional brushgear of explanation.Among the figure, label 1 refers to brushgear, and 2 refer to brush arm, and 3 refer to the brush bearing, and 4 refer to commutator, and 5 refer to the motor case lid, and 6 refer to brush part, and 7 refer to the effective length of brush.Such brushgear has a kind of like this structure usually: brush arm 2 is connected in overlapping mode with brush bearing 3, as shown in Fig. 1 (A).Yet, with this structure, the fulcrum of brush arm 2 drop on brush bearing 3 terminal contacted points on, as shown in FIG..This makes the effective length from fulcrum to the brush part 6 that contacts with commutator 4 be difficult to remain on suitable value.As Fig. 1 (B) with in the traditional brushgear 1(C), with the method for crooked brush arm 2, various trials have been done, so that in limited space, obtain maximum effective length (7).

Yet these crooked brush arms 2 not only involve to increase and are used for crooked man-hour, and involve following trouble: because the crooked part precision instability in addition that causes; Crackle that the Bauschinger effect relevant with rigid material causes and other defect.All these causes the product quality of miniature motor not to be consistent.

The intent of the present invention is to address these problems.

An object of the present invention is to provide a kind of brushgear of miniature motor,, by at the root of brush arm fluting, stablize brush tension force with the method for the effective length that prolongs brush arm at this brushgear.

Another object of the present invention provides a kind of like this brushgear of fractional motor, wherein, constitutes and line of rabbet joint sweep together by the root at brush arm, further stablizes brush tension force with the method for reinforcing the brush arm root.

Fig. 1 (A), 1(B), 1(C) be the figure of aid illustration brushgear prior art; Fig. 2 (A), 2(B), 2(C) be the figure of first embodiment of explanation brushgear of the present invention; Fig. 2 (A) is an end view, and Fig. 2 (B) is a plane graph, and Fig. 2 (C) is the end view of explanation brush arm open configuration.Fig. 3 is the schematic diagram that the explanation brushgear is put into the situation in the micro-machine.Fig. 4 is the figure that the aid illustration brushgear is installed in the situation on the miniature motor casing cover.Fig. 5 is the figure of action of the brushgear center brush arm of aid illustration first embodiment.Fig. 6 (A) and (B) be end view and the plane graph of second embodiment of brushgear of the present invention.Fig. 7 is the plane graph of explanation brushgear the 3rd embodiment of the present invention.

At Fig. 2 (A), (B) with (C), use with Fig. 1 (A), (B) and identical numeral and Fig. 1 (A) (C), (B) and (C) in identical part.Numeral 8 finger terminals, 9 refer to link; 10 refer to the brush arm vibration isolator; 11 refer to the line of rabbet joint.

As shown in Fig. 2 (B), brush arm 2 has link 9, is used to connect brush bearing 3.Root 2a at brush arm 2 has opened the line of rabbet joint 11.Therefore, the root 2a of brush arm also is included in the effective length 7 of brush arm 2, makes brush arm 2 can have longer effective length 7, moves as fulcrum with the root points 6 of the line of rabbet joint 11.

Fig. 3 is the schematic diagram that this brushgear of explanation is put into the situation in the miniature motor; Fig. 4 is that the aid illustration brushgear is installed in the situation map on the miniature motor casing cover.

In Fig. 3 and Fig. 4, digital 12 finger terminal holes; 13 refer to rotating shaft; 14 spindles hold; 15 refer to rotor.

This class miniature motor usually has such structure: commutator 4 and rotor 15 are fixedly mounted in the rotating shaft 13; Rotating shaft 13, is supported on the motor case made from synthetic resin 16 and motor case lid 5, as shown in Figure 3 via bearing 14 with its two ends.Brushgear 1 is together with brush arm 2, and passes binding post hole 12 and drawn as the binding post 8 of joint outer part together, is fixedly mounted on the motor case lid of being made by synthetic resin 5.In other words, brushgear 1 leaves the mode in the binding post hole 12 on motor case lid 5 by the end of binding post 8 is inserted, and is fixedly mounted on the motor case lid 5.

Fig. 5 is the auxiliary view of action of the brush arm of explanation first embodiment of the invention center brush device.Among the figure, with identical parts among digital corresponding diagram 1 identical among Fig. 1 and Fig. 2 and Fig. 2.

In the brushgear shown in Fig. 51, because brush arm 2 is that fulcrum moves with the root points 6 of the line of rabbet joint 11, so even in the confined space of motor case, also can keep the effective length 7 of enough brush arm 2.

Fig. 6 (A) and (B) be the explanation second embodiment of the present invention figure.Among the figure, use and the identical parts shown in the identical numeral shown in Fig. 2 and Fig. 2.In the brushgear shown in the figure, further increase the effective length 7 of brush arm 2, and taken measures to reinforce the root of brush arm 2.That is, the way of the tip bend of the root 2a by making brush arm 2 provides bending section 2b.By bending section 2b is provided, not only can sufficiently keeps the effective length 7 of brush arm 2, and can reach following desirable effect:

(ⅰ) by reinforcing the root 2a of brush arm 2, stoped brush arm 2 to be reversed or bending.

(ⅱ) resemble, under the occasion of back with the embodiment of narration,, can make above-mentioned effective length 7 be increased to maximum because can extend to the line of rabbet joint 11 top of root 2a shown in Fig. 7.In addition, can adjust the tension force of brush arm by the height of adjusting above-mentioned bending section 2b.

(ⅲ), help the improvement of motor performance widely by prolonging the brush arm effective length and adjusting the synergism effect that the bending section height is produced.

Fig. 7 is the plane graph of the 3rd embodiment of brushgear of the present invention.The 3rd embodiment shown in Fig. 7 has substantially the same structure and effect with second embodiment among the above-mentioned Fig. 6 of being shown in.By end the method for bending section 2b is set, has reinforced root 2a, and can extend to the line of rabbet joint 11 end of root 2a thus at the root of brush arm 2.Therefore, can further prolong the effective length 7 of brush arm.

As mentioned above, by the root at brush arm the line of rabbet joint is set, with the method for the effective length that prolongs brush arm, the present invention has following effect: follow commutator when rotating when brush, kept good contact condition and the contact of brush. In addition, when the line of rabbet joint is set, by the method for bending section is set at the brush arm root, can further prolongs the effective length of brush arm and reinforce the brush arm root; Therefore, can stop brush arm to be reversed or crooked; The tension force of brush can be adjusted to optimum state; Thereby, can improve forcefully the performance of small-sized motor.

Claims

1, the brushgear of the miniature motor of being made up of brush arm and brush bearing, brush arm have and are used for the brush part that electrically contacts with commutator, and the brush bearing has and passes the motor case lid, drawn the binding post part as aerial lug; Described brush arm is connected mutually in overlapping mode; Described brush part is supported by described motor case lid, and is suitable for electrically contacting with described commutator formation; Its characteristics are:

-at the root of described brush arm the line of rabbet joint is set, to prolong the effective length of described brush arm.

2, as the brushgear of the miniature motor of being advocated in the claim 1, it is characterized in that, wherein, root at described brush arm is provided with the line of rabbet joint, prolonging the effective length of described brush arm, and bending section is set, to reinforce described brush arm root at an end of described brush arm root.

As the brushgear of the miniature motor of advocating in the claim 2, it is characterized in that 3, the described line of rabbet joint that wherein is set up is set up an end position of bending section until described brush arm root.

4, the brushgear of the miniature motor of being made up of brush arm and brush bearing, brush arm have and are used for the brush part that electrically contacts with commutator, and the brush bearing has the motor case of passing lid, is drawn the terminal part as aerial lug; Described brush arm is connected in overlapping mode with described brush bearing; Described brush is supported by described motor case lid, and is suitable for electrically contacting with described commutator formation, and its characteristics are:

-at the root of described brush arm the line of rabbet joint is set, to prolong the effective length of described brush arm;

The lap of-described brush arm and described brush bearing is in a rectangular shape;

-many vertical grooves are set on the brush part of described brush arm; Brush part becomes rectangle, and its longitudinal size is greater than the longitudinal size of described lap;

-described groove extends to the root portion of approaching described brush arm from a free end of described brush arm brush part;

The side of-described brush arm connects with the described line of rabbet joint;

-brush arm vibration isolator is fixedly mounted in the part near described brush arm root.