CN1294437A

CN1294437A - Small motor with lead wire

Info

Publication number: CN1294437A
Application number: CN 00133177
Authority: CN
Inventors: 安藤健司; 柏崎裕司; 上木原博行; 饭田真之; 馆上彻
Original assignee: Mabuchi Motor Co Ltd
Current assignee: Mabuchi Motor Co Ltd
Priority date: 1999-10-29
Filing date: 2000-10-27
Publication date: 2001-05-09
Anticipated expiration: 2020-10-27
Also published as: CN1161872C; JP2001128409A

Abstract

A case cover for a small-sized motor comprises a cover plate, which closes the opening of a motor case, a brush holder which is coupled with and fixed to the cover plate, a pair of brushes and lead wires connected to the brushes. The cover plate and the brush holder are coupled with each other by a recessed part, which is formed in the cover plate and has a predetermined width in the radial direction and a coupling part, which is formed on the brush holder and has a shape coupled with the recessed part. An overhanging part is formed on the circumference part of the brush holder so as to form a space between the cover plate and itself. The lead wires, which are laid in the circumference part of the brush holder, are drawn out to the outside through the space.

Description

The miniature motor of band lead-in wire

The present invention relates to miniature motor, for example particularly relate to for realize driving the miniature motor of the band lead-in wire that makes its slimming that CD etc. uses on sound equipment etc.

Fig. 9, Figure 10 are the sectional arrangement drawings of the motor casing 1 of prior art, and this casing 1 usefulness metal material is made the hollow cylindrical at the end.Fig. 9 places the view that observation post gets when horizontal to the breach 23 of drawing lead-in wire usefulness, and Figure 10 revolves from the position of Fig. 9 to turn 90 degrees, viewed view when breach 23 is placed the top.In two figure, 21 are coupled to end difference on the casing to cabinet cover for being used for, and 24 is axis hole.

Fig. 7 and Fig. 8 represent the cabinet cover of prior art, are used for the peristome closure with this motor casing 1, have the bearing of an end of supporting rotating shaft simultaneously.The cabinet cover of Fig. 7 for being seen when the inboard of motor is observed, Fig. 8 then is the profile along the B-B line intercepting of Fig. 7.

The structure of existing miniature motor is, in motor casing 1 with the breach 23 of drawing lead-in wire as Fig. 9 and shown in Figure 10 being used to, magnet as the stator side magnetic pole is housed, and on rotating shaft, be assembled with the rotor that constitutes by various parts, on the peristome of this motor casing 1, cooperate Fig. 7 and cabinet cover 10 shown in Figure 8 are installed.At this moment, rotating shaft is supported by two bearings of the central portion that is installed in cabinet cover 10 respectively with the bottom center of the hollow tube-shape motor casing 1 that the end is arranged.

This cabinet cover 10 is made of the brush retainer 12 that is generally metal cover plate 11 and be mounted thereon.Cover plate 11 is provided with the recess that holds bearing 3 usefulness except that portion in the central, and its general structure is plane.Brush retainer 12 is supporting a pair of brush 13.The outermost end of this brush 13 is connected on the lead-in wire 14, and this lead-in wire 14 is after the periphery of walking around brush retainer 12, and two lines are put together leads to the outside.Electric current also and then by not shown commutator flows to winding from power supply via lead-in wire 14 and brush 13, thereby can drive motor.

Like this, plane by metal cover plate 11 is roughly in the cabinet cover 10 of prior art, suppress brush retainer 12 length in the axial direction simultaneously, and make lead-in wire 14 walk around the periphery of brush retainer 12, and reduce the gross thickness of cabinet cover.

But, in the cabinet cover 10 of this prior art,, thereby easily produce the problem of the locked grade of motor because lead-in wire 14 winding, iron core or the magnet etc. interior with being contained in motor casing 1 contact.

In addition, the thickness that the gross thickness of the cabinet cover 10 of prior art is equivalent to cover plate 11 is added the thickness of brush retainer 12, but in order to ensure its intensity, metal cover plate 11 must have certain thickness, thereby makes the overall slimming of miniature motor exist certain limit.

And then, in order radially to draw lead-in wire 14, breach 23 is set on motor casing 1, and need makes this breach 23 have enough degree of depth so that draw lead-in wire.Therefore, produced the problem of the roundness variation that makes motor casing 1.

The objective of the invention is to address the above problem, and make the further slimming of motor.

Another object of the present invention provides a kind of miniature motor, and described motor does not exist owing to lead-in wire winding, iron core or the magnet etc. interior with being contained in motor casing contact the problem that makes motor locked.

And then another object of the present invention provides a kind of miniature motor, and there is not the problem of the roundness variation that makes motor casing in described motor.

The invention provides a kind of miniature motor with lead-in wire, it comprises: the hollow tube-shape motor casing 1 that is shaped on the end by the metal that magnet 2 is installed on the inner peripheral surface, for the peristome of this motor casing 1 sealing being cooperated the cabinet cover 10 of installation, and the iron core 5 that is layered on the rotating shaft 4 is installed, is wound on the winding 6 on this laminate core 5 and the rotor of commutator 7.Cabinet cover 10 is made of following part: cover plate 11, its cooperation are installed on the motor outside, with the peristome of closed motor casing 1; Brush retainer 12 is positioned at that motor is inboard to be cooperated and be fixed on the cover plate 11; Be installed in a pair of brush 13 on this brush retainer 12; And two lead-in wires 14, it is connected respectively on the described a pair of brush 13, and the while concentrates on the motor outside and is drawn after walking around brush retainer 12 peripheries.Cover plate 11 and brush retainer 12 cooperate by be provided with on the cover plate 11 with the bearing of cover plate 11 central portions concentric and have the recess 15 of Rack, on brush retainer 12, be provided with and realize again with recess 18 corresponding to the auxiliary section 16 of these recess 15 shapes in radial direction.The peripheral part of brush retainer have and cover plate 11 between form the extension 25 of certain space, the lead-in wire 14 of walking around brush retainer periphery is introduced to the outside by this space.

In addition, the miniature motor of band lead-in wire of the present invention is provided with the breach 17 of drawing lead-in wire usefulness on cover plate 11, the end difference 21 that cooperates installation cover plate 11 usefulness is being set on the motor casing 1 and on its position corresponding to the breach 17 of cover plate 11 breach 22 is being set again, the breach 22 that is located on this motor casing 1 is compared and will be lacked with the axial length of end difference 21.

In addition, the miniature motor of band of the present invention lead-in wire, brush 13 is installed on the brush retainer 12, and from the more close radially center side of cabinet cover side extended position, and brush 13 can be from this installed position forward end lateral bending song than winding 6 in its position.

Fig. 1 represents that the present invention assembles the sectional arrangement drawing of all-in-one-piece miniature motor.

Fig. 2 is the view of only cabinet cover being seen from motor interior observation post when miniature motor shown in Figure 1 unloads.

Fig. 3 is the profile along the casing cover plate of A-A line intercepting shown in Figure 2.

When Fig. 4 is the cabinet cover decomposition that expression will be shown in Figure 3, the diagram of brush retainer and cover plate.

Fig. 5 is the sectional arrangement drawing of viewed motor casing when making breach 22 be positioned at the lateral attitude.

Fig. 6 is the sectional arrangement drawing of viewed motor casing when making breach 22 be in the top.

Fig. 7 is a diagram of observing the cabinet cover of prior art from the inboard of motor.

Fig. 8 is the profile along the cabinet cover of the B-B line intercepting of Fig. 7.

Fig. 9 is the sectional arrangement drawing of the motor casing of viewed prior art when breach 23 is placed the lateral attitude.

Figure 10 revolves the sectional arrangement drawing that turn 90 degrees the motor casing of viewed prior art when making breach be positioned at the top from the position of Fig. 9.

Fig. 1～Fig. 6 is the diagram of expression miniature motor that the present invention is specialized.Fig. 1 is the sectional arrangement drawing that is assembled into a structure when whole as miniature motor; Fig. 2 only unloads cabinet cover, the diagram of being seen when the motor interior direction is observed; Fig. 3 is the profile along the cabinet cover of the A-A line intercepting of Fig. 2; Fig. 4 is the diagram when cabinet cover shown in Figure 3 is resolved into brush retainer and cover plate, and Fig. 5 and Fig. 6 are the sectional arrangement drawings of motor casing seen when observing from different directions.

At first, with reference to Fig. 1 its general structure is described, miniature motor of the present invention does not have marked difference with the miniature motor of the thin type structure of prior art except the structure of the cabinet cover 10 that includes brush 13 and brush retainer 12.As shown in the figure, on the inner peripheral surface of the motor casing 1 of the hollow tube-shape that the end is arranged that forms with metal material, magnet 2 is installed.Laminate core 5 is being housed on the rotating shaft 4 usually, is being wound on winding 6 and commutator 7 on this laminate core 5, constituting the rotor of miniature motor.

Cooperate on the peristome of miniature motor casing 1 cabinet cover 10 is installed, and it is sealed by this cabinet cover.Central portion at the cover plate 11 that constitutes this casing 10 is equipped with the bearing 3 that is used for supporting rotating shaft 4.The other end of rotating shaft 4, is run through this bearing and is projected into the outside simultaneously in order to carry out mechanical bond with external loading by another bearing 3 supportings that are located at motor casing 1 bottom center place.

The a pair of brush 13 that contacts with commutator 7, as will be described later in detail, be supported on the brush retainer of making by synthetic resin 12, be directed to the outside of cabinet cover 10 to realize electrical connection by the lead-in wire 14 that is connected on the brush 13 simultaneously.

Below, with reference to Fig. 2～Fig. 4, the cabinet cover (comprising brush and machinery thereof and electrical connection) as feature of the present invention is described.The cover plate that is made of metal usually 11 that constitutes cabinet cover 10 is positioned at the outside of motor, typically, as see from the right side of Fig. 4, except that bearing with also having brush retainer usefulness recess 15 recess 18.This brush retainer is positioned at bearing with around the recess 18 with recess 15, and forms the overall shape for annular that diametrically have Rack concentric with it.Like this, cover plate 11 is plane unlike prior art, but forms the structure that recess makes it totally to have arch rib, thereby improves the bulk strength of cabinet cover 10, can reduce the thickness of cover plate 11.For example, corresponding to the thick existing structure of 0.8mm, adopt the present invention then can be thinned to 0.6mm.

Plastic brush retainer 12 fixing and supporting brush 13 is general as seeing from the left side of Fig. 4, is equipped with the corresponding brush retainer of the shape auxiliary section 16 of the recess of using with the brush retainer of aforementioned cover plate 11 15.When both assemble, with radial width be the brush retainer auxiliary section 16 of L2 be embedded into have general bigger slightly radial width L1 than L2 the brush retainer with in the recess 15, fixing and connect with flange riveted joint etc.Here so-called flange riveted joint is a kind of known fixed connection method, it is a kind of like this method: 16 are provided with integrally formed projection (flange) with contact-making surface one side of cover plate 11 in brush retainer auxiliary section, the position corresponding with this projection is provided with flange hole on cover plate 11 on the other hand, with projection insert in the flange hole cooperate after, exert pressure from the front of projection, by carrying out this leading section flattening fixedly connected.

Brush 13 is not rectilinear as prior art shown in the image pattern 7, but as shown in Figure 2, with sharp bend become L shaped after, come clamping to support by a pair of brush support protrusion 19,20.Further prolong brush 13 then and make it, utilize welding to wait and be connected with lead-in wire 14 near peripheral region.Because brush 13 needs to a certain degree mechanical strength and elasticity, thereby upwards certain width will be arranged at motor reel, the leading section from the support portion of brush to brush will have certain length simultaneously.Yet, as from shown in Figure 1, the winding 6 of rotor is located at the position of radially leaving the rotating shaft certain distance, because this winding stretches out to the direction of cabinet cover 10, when if brush 13 is positioned on this extended position, brush 13 will be subjected to certain restriction at the width that motor reel makes progress.

Therefore, the winding on the brush among the figure 13 6 is supported on included central portion (near the position of rotating shaft) locates, from this Support Position, this brush is crooked acutangulate L shaped in front.By this bending, can guarantee the predetermined length of brush, thereby also can guarantee its necessary elasticity (promptly can not cause the variation of brush pressure) corresponding to bending.In addition, between the link position of the Support Position of brush 13 and lead-in wire 14, there is no need to have elasticity, therefore, need not the width of guaranteeing that it makes progress at motor reel, can be adjacent to the surface of brush retainer.Utilize this structure, make the rotor-side of whole cabinet cover, can further make the motor slimming near motor.

Brush 13 is welded on the lead-in wire 14 at the circumference near cabinet cover 10.Lead-in wire is 14 particularly as Fig. 2, and is shown in Figure 3, passes and the inside in plastic brush retainer 12 integrally formed extensions 25 and cover plate 11 formed spaces, and is pressed in this space and walks around periphery.So just can prevent to go between 14 be contained in motor casing 1 in winding, iron core or magnet contact.

Breach 17 is set on cover plate 11, and on motor casing 1, breach 22 is set with these breach 17 corresponding positions.Fig. 5 is the sectional arrangement drawing of viewed motor casing when breach 22 is placed the lateral attitude, and Fig. 6 is the sectional arrangement drawing of viewed motor casing when breach 22 is placed the top.When assembling motor, the breach 17 of cover plate 11 and the breach 22 of motor casing form a hole in same position, and pair of lead wires is directed to the outside by this hole.Thereby, by breach 17 is set on cover plate 11, though the breach 22 on the motor casing 1 with and the length of the end difference 21 that cooperates of cabinet cover 10 compare short (with reference to Fig. 5), also can derive lead-in wire 14 outside.Therefore, can not damage the roundness of motor casing.

The present invention is by being arranged on the recess that the cover plate radial direction has Rack, and on the brush retainer, be provided with and the corresponding auxiliary section of this recess shapes, thereby the realization cover plate cooperates with the brush retainer, make whole cover plate form the structure of arch rib, thereby can improve the intensity of cover plate itself, and reduce the thickness of cover plate.

In addition, the periphery of brush retainer formed be used for and cover plate between leave the extension in space, making lead-in wire pass this space and be held in this space and being drawn out to the outside, thereby can prevent that lead-in wire from deviating from and contact with winding etc. from the brush retainer.

Claims

1. the miniature motor of band lead-in wire comprises: what magnet was installed on the inner peripheral surface has an end hollow tube-shape motor casing; The cabinet cover that cooperates installation for the peristome that seals this motor casing; And be equipped with at iron core stacked on the rotating shaft, be wound on the winding on this laminate core and the rotor of commutator, it is characterized in that:

The aforesaid chassis lid is by constituting with the lower part: cooperate to be installed in the cover plate that the motor outside is used to seal aforementioned motor casing peristome, match with aforementioned cover plate and be fixed on brush retainer on this cover plate in the inboard that is positioned at motor, be installed in a pair of brush on this brush retainer, be connected respectively to the outside and derivative pair of lead wires that the periphery of walking around the brush retainer on the described a pair of brush, simultaneously concentrates on motor afterwards;

By on the cover board be provided with the bearing of being located at the cover plate central portion with recess concentric and recess have preset width in radial direction, and the auxiliary section that has correspondingly-shaped with this recess is set on the brush retainer, realizes cooperating of aforementioned cover plate and brush retainer;

The periphery of aforementioned brush retainer be provided as and cover plate between leave the extension in space, the lead-in wire of walking around aforementioned brush retainer periphery is drawn out to the outside by aforesaid space.

2. the miniature motor of band lead-in wire as claimed in claim 1, lead-in wire derivation breach is set on aforementioned cover plate, simultaneously with the corresponding position of the breach of aforementioned cover plate breach is set being used on the aforementioned motor casing cooperate on the end difference that this cover plate is installed, the breach that is arranged on this motor casing is lacked than the axial length of aforementioned end difference.

3. the small electrical motor of band lead-in wire as claimed in claim 1, aforementioned brush is installed on the brush retainer, is positioned at than the position of aforementioned winding in the more close radial direction center side of the extended position of cabinet cover side, and simultaneously aforementioned brush is by the distolateral forward position bending in this installation site.