DE102017218534A1 - Brushless motor - Google Patents

Abstract

The object of the invention is to provide a brushless motor in which chips produced during the compression of a stator with respect to a housing can be reliably collected and problems caused by flying chips in the housing can be prevented. The object is achieved by providing on the outer circumference of a core (6) a stator (3) are formed at six points ridges (19), and at the front portion of the stator (3) a front insulator (7) is fixed. On the outer peripheral surface of the front insulator (7), relative to end surfaces (19a) of the ridges (19) in the press-fitting direction, front first partition walls (21) are relatively formed, and on both sides in the circumferential direction of the first partition walls (21) are second partition walls (21). 22) which bear against the end faces (19a) of the ridges (19). Thereby, quadrangular cavities (20) are formed surrounded by the first and second partition walls (21, 22) and the end surfaces (19a) of the ridges (19), and when the stator (3) is pressed relative to the housing (2), they rub Burrs (19) of the stator (3) on the inner peripheral surface of the housing (2), and chips (A) resulting therefrom are collected in the cavities (20)

Description

Technical area

The present invention relates to a brushless motor, and more particularly to a brushless motor, wherein a stator in which a winding wire is wound on a core is fixed in a pressed state with respect to a press-fit member, and generates a magnetic field by supplying the winding wire with current Rotational force is exerted on a stator facing the rotor arranged.

General state of the art

A known brushless motor is driven according to the principle that the power supply of a winding wire wound around the core of a stator is controlled and a magnetic field is continuously switched, whereby a rotational force is applied to a rotor having a permanent magnet. For example, the stator is fixed in a housing, and in a brushless motor of the internal rotor type inside which the rotor is rotatably supported, press-fitting is used as a method of fixing the stator in the housing.

Since the thermal expansion of the housing and the stator are different, it occurs that the compression loosens due to the temperature increase during operation of the engine, and also caused by vibrations during engine operation, such relaxation. For example, loosening may cause the stator to rotate in the housing so that the desired performance can not be maintained, so the tolerance between the housing inner diameter and the stator outside diameter is carefully designed to provide sufficient compression.

However, while a high degree of compression increases the reliability of the engine, it can also lead to problems due to the formation of chips. The outer peripheral portion of the stator core rubs on the inner circumferential surface of the housing during compression, and while the surface of the housing is galvanized for rust prevention, the stator core is made of harder silicon steel sheet or the like. In the compression, therefore, the metallization of the housing inner peripheral surface is removed by the outer peripheral portion of the stator core. Even if the housing or stator core is made of a different material, a certain amount of abrasion occurs during pressing. When the conductive chips fly around in the housing, the insulation performance in the motor decreases, resulting in short-circuiting of contacts. Even if a surface treatment is performed with non-conductive materials, there is a risk that the motor can not turn because the chips penetrate into the bearing.

As a technique for alleviating these problems, for example, in a brushless motor disclosed in Japanese Laid-Open Patent Publication No. 4-127865, in a recess formed in the housing, chips generated at the time of press-fitting the stator are caught. More specifically, the housing along the axis of the rotor in the form of a bottomed cylinder, and the recess is formed on the outer periphery at its deepest portion.

As in 1 Japanese Patent Laid-Open Publication No. 4-127865, when the stator is pressed in, the housing is fixed with the opening part facing up, and the stator is press-fitted into the housing from above. The chips formed during pressing fall down and are caught in the recess, and the recess is closed by the pressed down to the deepest section stator.

Documents of the prior art

patents

Patent document 1: Japanese Patent Laid-Open Publication No. 4-127865

Brief description of the invention

Object of the present invention

However, in the technique of Japanese Laid-Open Patent Publication No. 4-127865, because of the positional relationship of the recess of the housing and the formation position of the chips, the chips can not be caught as intended

Namely, in the technique of Japanese Laid-Open Patent Publication No. 4-127865, since the friction on the outer peripheral portion of the stator is always caused to form chips on the housing inner circumferential surface, it is considered that the chips are caught in the recess formed immediately below the deepest portion of the housing can be. However, the chips are continuously generated from the beginning to the end of the pressing of the stator, and the chips formed by friction are powdery.

Therefore, at the beginning of pressing, chips are formed at the uppermost portion of the housing, and the powdery chips fly around as they fall down in the housing. Therefore, only part of the chips can be caught in the well, while the greater part of the chips flies unhindered in the housing, so that later the operating problems of the engine described above occur.

The present invention has been made in view of these problems, and it has for its object to provide a brushless motor in which the chips produced during the pressing of the stator into the housing reliably collected, prevents the flying around of the chips in the housing and prevents problems caused by chips can be.

Means for solving the problem

In order to achieve the above object, a brushless motor in which a press-in member is fixed to one of the inner and outer circumference of a stator formed by winding a winding wire around a core in the press-in state is fixed to the other one of the inner and outer Outer circumference of the stator is arranged a rotor having a concentric with the stator axis of rotation and a permanent magnet, and by supplying the winding wire of the stator with current a magnetic field is generated to exert rotational force on the rotor, characterized in that a collecting portion, the chips caught, which are formed by rubbing the stator and the press-fitting member to each other in the press-fitting, is formed on a surface of the stator, which is opposite to the press-in element (claim 1).

According to the brushless motor constructed as described above, chips are generated by rubbing the stator and the press-fitting member together upon press-fitting, and the swarf-forming position gradually changes with the movement of the stator with respect to the press-in member during press-fitting in the press-forward direction. In accordance with the changing formation position of the chips, the position of the collecting section arranged in the press-on forward direction on the counter-overlapping surface of the stator also changes. The collecting section and the formation position are therefore always kept in the same positional relationship from the beginning to the end of the pressing in, so that the generated chips are reliably collected in the collecting section.

As a further aspect, the collecting section is preferably formed on the counter-bearing surface of the stator in the pressing in front / rear with respect to the press-in further in the direction of injection at the front than the formation position of the chips (claim 2).

Since chips are formed in the pressing of the stator and press-in element mainly in the press-in direction of the stator, the catch portion formed in the press-fitting direction according to this aspect is necessarily close to the formation position of the chips, so that the chips are reliably caught in the catch portion.

As a further aspect, the stator and the press-in element rub against one another in a circumferential direction orthogonal to the press-in direction front / rear during pressing, and the catching section is preferably formed in the circumferential direction of the opposing surface of the stator at least in a region corresponding to the friction points on the press-in element (claim 3). ,

According to this aspect, since the collecting portion in the circumferential direction of the opposing surface of the stator is formed on the opposing surface in the circumferential direction of the stator in the region corresponding to the friction points on the press-in member, the chips are reliably caught in the collecting portion.

As a further aspect, the collecting section is preferably formed by a first partition, which relatively frontally opposite the formation position of the chips due to the friction in the press-in and prevents the flying around the chips in the direction of press-on forward (claim 4).

According to this aspect, is formed by the partition wall, which is relatively opposite the formation position of the chips due to the friction in the press-in towards the front, prevents the flying around of the chips in the direction of injection to the front

As a further aspect, the collecting portion is preferably formed by the first partition and a second partition on both sides of the first partition in the circumferential direction, which prevents the flying around of the chips in the circumferential direction (claim 5).

According to this aspect, the circumferentially arranged second partition on both sides of the first partition prevents the chips from flying around in the circumferential direction.

As a further aspect, an insulator, which maintains the insulation between the core and the winding wire, is fastened to the stator at least in the direction of injection at the front, wherein the collecting section is formed on the insulator (claim 6).

According to this aspect, since the insulator is formed at the catching portion, the specification change can be limited to the insulator without requiring a specification change of the other components.

As a further aspect, the catching portion of the insulator preferably jumps with respect to Friction point of the stator on Einpresselement further to Einpresselementseite ago and is pressed in the compressed state of the stator and press-in elastic to the press-in (claim 7).

Since the collecting portion according to this aspect is pressed in the pressed state of the stator and press-in element elastically to the press-in element, the escape of chips from the collecting section is prevented.

As a further aspect, the first partition wall is preferably formed continuously around the entire circumference of the opposing surface of the stator (claim 8).

Since the first partition wall according to this aspect rotates around the entire circumference of the opposing surface of the stator, the chips are prevented from overcoming the first partition wall and flying forwards in the press-fitting direction.

As a further aspect, the stator preferably allows a plurality of circumferentially spaced projection portions to rub along the press member, and the catch portion is a recessed groove formed by the first partition wall and a third partition wall in the press fitting direction behind the first partition wall by cooperation with the first partition wall Projecting portions extends around the entire circumference of the counter-surface Stator and prevents flying around the chips in the direction of press-in towards the rear (claim 9).

According to this aspect, since the third partition wall which extends in the press-fitting direction behind the first partition wall in cooperation with the projection portions around the entire circumference of the opposing surface stator, flying around the chips in the direction of press-fitting is prevented. In addition, the chips are trapped in the recessed groove formed between the first partition wall and the third partition wall.

Effect of the invention

According to the brushless motor of the present invention, chips generated during the pressing of the stator and the press-fitting member are reliably caught in the catching portion, so that the flying chips in the housing can be prevented and problems due to the chips can be prevented in advance.

list of figures

• 1 eine Schnittansicht eines zusammengebauten Zustands eines bürstenlosen Motors des Innenläufertyps gemäß einer Ausführungsform;
• 2 eine auseinander gezogene perspektivische Ansicht einer Beziehung von Gehäuse und Stator des bürstenlosen Motors;
• 3 eine teilweise vergrößerte Ansicht von 2, die die Umgebung von Hohlräumen zeigt, in denen ein vorderer Isolator des Stators gebildet ist;
• 4 eine Schnittansicht entlang der Linie IV-IV aus 3, die die Umgebung der Hohlräume zeigt, in denen der vordere Isolator des Stators gebildet ist;
• 5 eine Schnittansicht entlang der Linie V-V aus 4, die die Umgebung der Hohlräume zeigt, in denen der vordere Isolator des Stators gebildet ist;
• 6 eine teilweise vergrößerte Schnittansicht, die die Umgebung der Hohlräume zu Beginn des Einpressens des Stators zeigt;
• 7 eine teilweise vergrößerte Schnittansicht, die die Umgebung der Hohlräume während des Einpressens des Stators zeigt;
• 8 eine teilweise vergrößerte Schnittansicht, die die Umgebung der Hohlräume nach dem Einpressen des Stators zeigt;
• 9 eine Ansicht, die 3 entspricht und ein weiteres Beispiel der ersten Trennwände zeigt, die am gesamten Umfang der Außenumfangsfläche des Stators gebildet sind;
• 10 eine Ansicht, die 3 entspricht und ein noch ein weiteres Beispiel der ersten und der dritten Trennwände zeigt, die am gesamten Umfang der Außenumfangsfläche des Stators gebildet sind;
• 11 eine schematische Ansicht eines bürstenlosen Motors des Innenläufertyps gemäß einer Ausführungsform;
• 12 eine schematische Ansicht eines bürstenlosen Motors des Außenläufertyps gemäß einer Ausführungsform; und
• 13 eine schematische Ansicht eines weiteren Beispiels eines bürstenlosen Motors des Außenläufertyps gemäß einer Ausführungsform.

Show it:

• 1 5 is a sectional view of an assembled state of an internal rotor type brushless motor according to an embodiment;
• 2 an exploded perspective view of a relationship of housing and stator of the brushless motor;
• 3 a partially enlarged view of 2 showing the vicinity of cavities in which a front insulator of the stator is formed;
• 4 a sectional view taken along the line IV-IV 3 showing the vicinity of the cavities in which the front insulator of the stator is formed;
• 5 a sectional view taken along the line VV 4 showing the vicinity of the cavities in which the front insulator of the stator is formed;
• 6 a partially enlarged sectional view showing the vicinity of the cavities at the beginning of the pressing of the stator;
• 7 a partially enlarged sectional view showing the vicinity of the cavities during the pressing of the stator;
• 8th a partially enlarged sectional view showing the vicinity of the cavities after the press-fitting of the stator;
• 9 a view that 3 and showing another example of the first partition walls formed on the entire circumference of the outer circumferential surface of the stator;
• 10 a view that 3 and showing still another example of the first and third partition walls formed on the entire circumference of the outer circumferential surface of the stator;
• 11 a schematic view of an internal rotor type brushless motor according to an embodiment;
• 12 a schematic view of an external rotor type brushless motor according to an embodiment; and
• 13 a schematic view of another example of an external-rotor type brushless motor according to an embodiment.

Embodiment of the invention

Hereinafter, the present invention will be described using the embodiment of the embodiment of a brushless motor of the internal rotor type, wherein a rotor is rotatably supported on the inner peripheral side of a stator.

1 11 is a sectional view of an assembled state of an internal rotor type brushless motor according to an embodiment; 2 shows an exploded perspective view of a relationship of housing and stator of the brushless motor, 3 shows a partially enlarged view of 2 depicting the environment of a cavity in which a front insulator of the stator is formed, 4 shows a sectional view taken along the line IV-IV 3 in a frictional state of the stator to the housing inner peripheral surface and 5 a sectional view taken along the line VV 4 in the state of friction of the stator on the housing inner peripheral surface.

Overall, the brushless motor 1 (hereinafter also referred to as motor) designed such that in a housing 2 (Pressing) in the form of a bottomed cylinder, which is open on one side, a stator 3 is pressed in and inside the stator 3 a rotor 4 is rotatably mounted. As in the following description by the arrow in 2 shown is the on the outer circumferential surface of the stator 3 (The opposite surface of the press-in element according to the invention) in the press-fitting of the stator 3 extending direction as pressing-in direction front / rear (front and rear part in the press-fitting direction), while the direction orthogonal to the pressing direction front / rear is referred to as a circumferential direction. An inside-outside direction whose center is the rotation axis L of the rotor 4 is referred to as inner circumference side and outer circumference side, respectively.

The housing 2 is made of pressed galvanized sheet metal, and in the middle of its deepest inner portion is a bearing 5 for supporting a rotor 4 intended.

The core 6 of the stator 3 consists of several annular laminated silicon steel sheets and is cylindrical in the press-in direction front / rear. On the inner circumference of the core 6 in the circumferential direction at equal intervals, six teeth 6a extending in the press-fitting direction (shown in FIG 3 ) are formed, and between the six teeth 6a slots 6b are formed in each case, which extend in the pressing in front / behind.

In the press in front is a front insulator 7 at the core 6 fixed, and in the pressing direction behind a rear insulator 8 is at the core 6 fixed. The insulators 7 , 8 are made of plastic material and form a total of the core 6 corresponding annular profile, wherein on the front insulator 7 six teeth 6a of the core 6 corresponding protrusions 7a are formed in the circumferential direction at equal intervals and also on the rear insulator 8, although not shown, six of the teeth 6a corresponding projections are formed.

As in particular in 1 1, a winding wire is wound on the teeth 6a via the slots 6b between which the teeth 6a lie, and the winding wire is arranged in the order of the U, V, and W phases, with equal phases through connecting wires, not shown are connected and a total polyphase coil 9 is formed. The stator 3 gets through the core 6 , the front and rear insulator 7 , 8 and the coil 9 is formed, with the insulation between core 6 and coil 9 through the front and rear insulators 7 , 8 is maintained.

An opening portion of the housing 2 into which the stator 3 is pressed, is closed by an end bell 10, and in the middle of the end bell 10 is a bearing 11 for supporting the rotor 4 intended. The rotor 4 is in the case 2 concentric to the stator 3 arranged on the inner peripheral side. The rotor 4 is configured such that a rotary shaft 13 whose center is a cylindrical iron core 12 is passed and fixed, and on the outer circumference of the iron core 12 permanent magnets 14 are arranged alternately of opposite polarity.

The two ends of the rotary shaft 13 of the rotor 4 be from the bearings 5, 11 of the housing 2 and the end bell 10 are supported and thereby about the axis of rotation L of the rotor 4 rotatable. An end portion of the rotating shaft 13 in the press-fitting direction at the front largely jumps from the housing 2 before, and the end portion is coupled to a drive object and serves as an output shaft.

In the case 2 is between stator 3 and end bell 10 a printed circuit board 15 is arranged. On the circuit board 15 are rotational angle sensors 16, the angle of rotation of the individual phases of the rotor 4 and terminals 17 of the individual phases are formed, the terminals 17 passing through the end bell 10 and projecting outwardly.

When using the engine 1 becomes the engine 1 powered by a power cable connected to the terminals 17, and by the rotation angle of the rotor 4 , which is detected by the rotation angle sensors 16, the phases of the coil 9 are energized in a certain timing, whereby the magnetic field of the coil 9 is continuously switched and a rotational force on the rotor 4 is exercised.

On the outer circumference of the core 6 of the stator 3 again at equal intervals in the circumferential direction at six points burrs 19 (the friction points on the press-in element and the several Protrusion portions of the present invention), and the press-fitting of the stator 3 in the case 2 done by the burrs 19 with respect to the inner peripheral surface of the housing 2 Partially rub along it in the circumferential direction. As mentioned in the general state of the art, the burrs become rubbed 19 of the core 6 on the inner peripheral surface of the housing 2 on the inner peripheral surface of the metalization abraded, which generates chips that lead to problems such as short circuits and the like. As a measure, the technique of Japanese Laid-Open Patent Publication No. 4-127865 has been proposed, but since the recess is formed at the deepest portion of the housing, there is a problem that the chips are not reliably caught.

In view of these problems, the inventors have considered the position of the recess for catching the chips. As discussed under the object of the present invention, the swarf flying around freely occurs because the swarf's formation position and depression are away from each other as the swarf's formation position shifts along with the progress of the press-fitting operation. No matter where the recess is formed in the housing, it is inevitable that the formation position of the chips at a time of the press-fitting operation is far away from the depression, so that the chips in any case fly around unhindered.

Leg Pressing the stator 3 rub the burrs 19 on the inner peripheral surface of the housing 2 while moving forward in the press-fitting direction, whereby the friction area on the inner circumferential surface gradually widens and the chips do not develop in the entire friction area but at the corner portions of the ridges 19 in the press in front. As the position of origin of the chips changes with the movement of the stator 3 changed, it was found that when providing the recess on the side of the stator 3 (In the present embodiment, the cavity 20 ) from the beginning to the end of the pressing of the stator 3 the approximation ratio between the formation position of the chips and the depression can be maintained.

Based on this finding is on a front insulator 7 in the press-in before the ridges 19 of the stator 3 is arranged, a cavity 20 (Catching section) provided for catching chips, this cavity 20 should be described in detail.

As in particular in 3 - 5 shown are the burrs 19 on the outer circumference of the core 6 formed at equal intervals in the circumferential direction at six points in pairs (twelve in total), the burrs 19 over the entire press-in direction of the core 6 are arranged extending forward / backward. The tolerance between the outer diameter of the core 6 who has the ridges 19 includes, and the inner diameter of the housing 2 is carefully designed, whereby a sufficient Einpressmaß can be guaranteed. The sectional shape of the ridges 19 is as indicated by the dot-dash line in 4 shown as being pointed to the inner peripheral surface of the housing 2 approximates, wherein a surface pressure per unit surface with respect to the inner peripheral surface of the housing 2 is increased.

The burrs 19 extend from the front end of the core 6 that is, at the boundary between the core 6 and the front insulator 7 , and the end face of the core 6 viewed in the press-in from the front has a shape, wherein at six points at equal intervals in the circumferential direction each have a pair of burrs 19 protrudes to the outer peripheral side. When pressing in the stator 3 Form the end surfaces 19a of the ridges 19 therefore, corner portions which the metallization on the inner peripheral surface of the housing 2 scrape. Corresponding to the respective pairs of burrs 19 in the press-fitting direction at the front is equidistantly in the circumferential direction on the outer peripheral surface of the front insulator 7 in six places each through the first and second partition wall 21 . 22 the cavity 20 educated.

Specifically, according to the front of the pair, burrs 19 in the press-in direction in each case a first partition 21 formed, these first partitions 21 at positions a certain distance from the end faces 19a of the ridges 19 are arranged in the press-in at the front and each of the end face 19a are relatively opposite. On both sides in the circumferential direction of each first partition 21 each is a second partition 22 continuous with the first partition 21 formed, with these second partitions 22 on the back in the press-in, so to the ridges 19 of the core 6 extend. The second partitions 22 lie on the end face of the core 6 such that the end surfaces 19a of the ridges 19 lie between them, and extend at the abutment point at a right angle from the ridges 19 path.

Surrounded by the first and second partitions 21 . 22 and the end surfaces 19a of the ridges 19 is on the outer peripheral surface of the front insulator 7 an approximately square recessed cavity 20 educated. The cavities 20 are therefore formed circumferentially in areas that burr the pairs 19 correspond.

As in 4 shown, overlap end surfaces of the second partitions 22 and the ridges 19 in the circumferential direction slightly, and although not shown, one between the pairs burrs 19 formed space in the press-in direction to the rear continuously and is at the rear end of the core 6 closed by a rear insulator 8. In a pressed-in state of the stator 3 in the case 2 are the cavities 20 therefore through the first and second partitions 21 . 22 and the end surfaces 19a of the ridges 19 in the press-in direction front / rear and closed in the circumferential direction, and in addition, the inner peripheral side of the cavities 20 through the front insulator 7 closed, while the outer peripheral side through the housing 2 is closed.

As in 5 Shown by the dashed line is the outer diameter of the front insulator 7 with the first and second partitions 21 . 22 the same size as the outer diameter of the core 6 with the ridges 19 or something larger. If the outside diameter of the front insulator 7 slightly larger than the outer diameter of the core 6 is, bends, as shown in the figure by the solid line, in the housing 2 Pressed stator 3 the front insulator 7 made of plastic slightly in the direction of decreasing diameter, the center of which is the axis of rotation L, and expresses the first and second partitions due to its inherent elasticity 21 . 22 to the inner peripheral surface of the housing 2 at.

For easy guiding of the front insulator 7 in the case 2 when pressing in the stator 3 are the corners of the second partitions 22 rounded off in the pressing-in direction.

The brushless motor 1 The present embodiment is configured as described above, and it should now be the assembly of the engine 1 , In particular, the pressing of the stator 3 in the case 2 as well as the collecting action for chips through the cavities 20 to be discribed.

First, the core 6 , the front and rear insulator 7 , 8 and the coil 9 assembled in a specific relationship to the stator 3 to build. Then the case becomes 2 fixed with the opening turned upwards, the front insulator 7 is placed in a down-facing position and the stator 3 gets into the case from the top 2 pressed.

6 - 7 are enlarged partial sectional views of the environment of the cavities, the press-in process of the stator 3 show, where 6 the beginning of pressing in, 7 the pressing in and 8th shows the end of the pressing. If the stator 3 as described above from above into the housing 2 is introduced corresponds in the individual figures, the side obliquely bottom left of the actual bottom, with force acts in the direction of this bottom.

When pressing in the stator 3 first, as in 6 shown the front insulator 7 of the stator 3 with the opening of the housing 2 brought into conformity and insertion into the housing 2 began. Because the corners of the second partitions 22 As described above, the front insulator becomes rounded 7 easy in the case 2 guided. Along with the insertion, the front insulator bends 7 over the second partitions 22 in the direction of decreasing diameter, and by its elasticity rub the first and second partitions 21 . 22 on the inner peripheral surface of the housing 2 ,

After the front insulator 7 becomes the core 6 in the case 2 introduced, and as in 7 shown, rub the burrs 19 of the core 6 on the inner peripheral surface of the housing 2 while they are moving down, causing the press-fitting of the stator 3 in the case 2 he follows. After the core 6 is also the rear insulator 8 in the housing 2 introduced, and as in 8th shown is the pressing of the stator 3 completed when the front insulator 7 the deepest section of the case 2 reached.

The iron core 12, the rotary shaft 13 and the permanent magnet 14 in turn, are assembled in a specific relationship to the rotor 4 to form, and this rotor 4 is after pressing in the stator 3 in the case 2 arranged inside it. Next, the circuit board 15 in the housing 2 arranged, and the end bell 10 is at the opening of the housing 2 fixed to close it, bringing the assembly process of the engine 1 is completed.

As with reference to 7 discussed, rub while pressing in the stator 3 the ridges 19 of the core 6 on the inner peripheral surface of the housing 2 , and along with the movement of the ridges 19 becomes the metallization of the inner peripheral surface of the housing 2 Scrapped by their front in the press-fitting corner sections. This creates the chips A always in the press-in before the ridges 19 , so along with the movement of the ridges 19 also the originating position of the chips A gradually changed in the direction of insertion forward.

The end faces 19a, which are the corner portion of the ridges 19 form cooperatively with the first and second partitions 21 . 22 the cavities 20 , and the cavities 20 are extremely close to the formation position of the chips A arranged. Because the cavities 20 at the stator 3 themselves are arranged, by the burrs 19 the chips A are generated, move together with the emergence position of the chips A also the cavities 20 in the press-in direction forward. This will be between the cavities 20 and the formation position of the chips A from the beginning to the end of the pressing process of the stator 3 always a certain positional relationship (arrangement of the cavities 20 immediately below the formation position).

The chips A By scraping with the corner sections of the ridges 19 arise, therefore fall immediately after the emergence due to gravity and are of the immediately underlying cavities 20 collected. In other words: because the corner sections of the ridges 19 in the cavities 20 present, the chips are produced A due to the corner sections always inside the cavities 20 and can thus be caught in their interior. Through the first partitions 21 is prevented from flying around the chips in the direction of injection forward, and through the second partitions 22 flying around in the circumferential direction is prevented, and by the end faces 19a of the ridges 19 In addition, flying around in the direction of injection behind is prevented. Since the chips are pressed in A in the feed direction of the burrs 19 of the core 6 n are pushed out, the present invention is effective even if the force of gravity during pressing is not directed downwards.

Not only when pressing in the stator 3 but also during operation of the assembled engine 1 are therefore independent of the position of the engine 1 the chips A always in the closed cavities 20 locked in. In the present embodiment, in particular, the outer diameter of the front insulator 7 with the first and second partitions 21 . 22 slightly larger than the outer diameter of the core 6 with the ridges 19 is fixed, the first and second partitions 21 . 22 of the front insulator 7 elastic to the inner peripheral surface of the housing 2 pressed. This can prevent chips A through a gap between the partitions 21 . 22 and the inner peripheral surface of the housing 2 from the cavities 20 escape.

In addition, if during the press-in process previously adhesive in the cavities 20 is applied, the adhesive hardens while receiving the chips A out, causing a leakage of the chips A can be prevented even more reliable.

In the above description, the scraping of the metallization became the outer peripheral surface of the housing 2 However, depending on the specifications of the engine 1 etc. also the burrs 19 on the side of the core 6 scraped off. But even in this case, the chips are A reliable in the cavities 20 collected.

Above was also the introduction of the stator 3 from the top into the housing 2 but the same applies to another position, and even if the stator 3 is fixed and the housing 2 from the top of the stator 3 the shavings are put on A continue inside the cavities 20 collected.

As described above, according to the brushless motor 1 the present Ausfürungsform when pressing the stator 3 in the case 2 resulting chips A reliable in the cavities 20 be caught. Therefore, problems can be caused by flying chips A in the case 2 For example, a reduction in the isolation of the engine 1 and short circuits on the contacts or problems such as burn-in of the rotary shaft 13 of the rotor 4 into the bearings 5, 11 are prevented from the outset.

It no longer necessary, the insertion size of the stator 3 in relation to the housing 2 to prevent the formation of chips A lower the ideal value, so in the case 2 generated chips A do not pose a problem. As a result, by ensuring a sufficient Einpressmaßes a common rotation of the stator 3 in the case 2 and other problems are reliably prevented.

As in the present embodiment, the cavities 20 on the front insulator 7 provided that the specifications of other elements such as core, etc. are not changed, and only the specifications of the front insulator 7 have to be changed, and beyond that is the formation of cavities 20 in relation to the front insulator 7 very easy.

If, for example, at the core 6 which is a laminate of silicon steel sheet, the cavities 20 are provided, the shape of the large number of silicon steel sheets, which at the training places of the cavities 20 be present, with gradual change in pressing direction front / rear to be changed to the cavities 20 form what makes the work very complicated.

Be the cavities 20 on the other hand, on the plastic front isolator 7 formed, only the mold for injection molding must conform to the shape of the first and second partitions 21 . 22 on the front insulator 7 be adjusted while the cavities 20 by itself by the bond to the core 6 be formed. The Entformungsrichtung in forming the first and second partitions 21 . 22 also agrees with the demoulding direction of the front insulator 7 even in the axial direction (press-in direction front / rear) match.

Therefore, the basic design of a two-part mold need not be changed, and instead, the mold must be used to form the first and second partitions 21 . 22 only slightly changed. The brushless motor 1 Thus, in the present embodiment, by merely changing the specifications of the front isolator 7 be realized extremely inexpensive.

However, the present invention is not limited to the cavities 20 on the front insulator 7 are formed, and although a little work is required, the cavities 20 also at the core 6 be formed. If the cavities 20 at the core 6 are formed, the position of the cavities 20 in the press-fitting direction front / rear is not limited to the front in the press-fitting, and the cavities 20 For example, can also press in front / rear at a central position of the core 6 be formed.

In the embodiment described above, the recessed cavities become 20 through the first and second partitions 21 . 22 in approximately quadrangular shape on the outer circumference of the front insulator 7 however, the catching portion of the present invention is not limited thereto.

As in another example in 9 shown, the first partitions 21 serve by a change in shape as the collecting section according to the invention. The first partitions 31 of this further example, as in the embodiment, are at a certain distance relative to the end faces 19a of the ridges 19 However, they differ in that they are on the entire outer peripheral surface of the front insulator 7 (corresponding to the opposing surface of the stator of the present invention).

When pressing in the stator 3 passing through the corner sections of the ridges 19 shaved chips A fall down, they are passing through the first immediately below the entire circumference extending first partitions 31 blocked and accumulated, which prevents the chips A when pressing in the first partitions 31 overcome in the press-in direction forward and in the housing 2 flying around. At the first partitions 31 This further example will be different than in the cavities 20 the embodiment of the chips A not trapped inside, but by flying around the chips A in the case 2 is prevented, the same effect as in the first embodiment can be achieved.

The first partitions 31 out 9 can also be used in the press-in direction behind third partitions 32 to be added. This further example is in 10 shown, wherein on the outer peripheral surface of the front insulator 7 in the press-fitting direction front / back at positions with the end surfaces 19a of the ridges 19 match, third partitions 32 extend in the circumferential direction. The third partitions 32 are at the location of the ridges 19 shared, but the third partitions 32 and the end surfaces 19a of the ridges 19 slightly overlap each other at their end surfaces in the circumferential direction.

By the third partitions 32 with the ridges 19 cooperate, they run around the entire circumference of the outer peripheral surface of the front insulator 7 away, and putting between them and the first partitions 31 around the entire circumference of the front insulator 7 continuously a recessed groove 33 is formed, this recessed groove 33 as the collecting section of the present invention. The from the corner sections of the ridges 19 shaved chips A be through the recessed groove 33 included, why the same effect as with the embodiment can be achieved.

The present invention has been exemplified by a brushless motor 1 of the internal rotor type, but the brushless motor of the present invention is not limited to this, and as long as it is a brush motor in which the press-in member is pressed on one of the inner and outer circumference of the stator, an application is possible regardless of the type of motor. An application to an external rotor type brushless motor in which the rotor is rotatably supported on the outer peripheral side of the stator, or an application to a stepping motor or a switched-resistor motor or an AC motor using a commercial power supply is possible, and so on Motors are included in the brushless motor of the present invention.

In the following, another example of a brushless motor of the external rotor type will be briefly described.

As the external rotor type brushless motor, there are two types with different rotor bearing structure. The one engine 41 is schematic in 12 shown and has an embodiment in which the rotor 44 independent of the stator 42 is stored by a separate element, while the other motor 51 schematically in 13 shown and has an embodiment in which the rotor 56 over the stator 52 is rotatably mounted.

In comparison of the construction of these engines 41 . 51 with the brushless motor 1 of the internal rotor type used in 11 is shown, the press-in state of the stators 42 . 52 with respect to the press-fit element 43, 53 and the formation of the cavities 46 . 58 (Catchment section).

First, as described in the embodiment, the brushless motor 1 of the internal rotor type 11 , fixed in a state in which the housing 2 as a press-in element on the outer peripheral side of the stator 3 is pressed while the rotor 4 on the inner peripheral side of the stator 3 is arranged. When pressing on the outer circumference of the stator 3 (Core 6 ) are on the outer circumference of the stator 3 (front insulator 7 ) Cavities 20 formed, so that they with the ridges 19 at the six places that are on the inner peripheral surface of the housing 2 rub (only one place shown), match.

By contrast, in the brushless motor 41 of the external rotor type 12 as a press-in element on the inner peripheral side of the stator 42 fixed a fixing shaft 43 in the pressed state, and on the outer peripheral side of the stator 42 becomes the rotor 44 arranged and rotatably supported by a shaft bearing element, not shown. Although here the ratio of inner and outer circumference of the fixing shaft 43 with respect to the stator 42 in comparison to the housing 2 out 11 vice versa, the stator becomes 42 kept fixed in the same way. When pressing the fixing shaft 43 in the stator 42 rub several burrs 45 (Only one is shown), which on the inner peripheral surface of the stator 42 formed on the outer peripheral surface of the fixing shaft 43, and of the corner portions of the ridges 45 be in the press-in front chips A generated.

In the process of pressing in front of the ridges 45 on the inner peripheral surface of the stator 42 cavities 46 educated. If the stator 42 is placed from above on the fixing shaft 43 (the bottom of the page in the direction of injection corresponds to the front), the cavities 46 always immediately below the formation position of the chips A arranged. Therefore, the resulting chips A Reliable in the cavities without repeated description 46 be caught, and the same effects as in the embodiment can be achieved.

At the brushless motor 51 of the external rotor type 13 on the other hand, the stator becomes 52 held fixed by an unillustrated fixing member, and as a press-fitting member, a bearing holding member 53 in a compressed state on the inner peripheral side of the stator 52 fixed. By a bearing 54, which is inserted into the bearing support member 53, a rotor 56 via a rotation shaft 55 on the outer peripheral side of the stator 52 rotatably mounted. In this case, the bearing holding member 53, the bearing 54 and the rotating shaft 55 cooperatively serve to rotate the rotor 56 respectively.

When pressing the bearing support member 53 in the stator 52 rub as well as in the 12 shown several burrs 57 (Only one is shown), which on the inner peripheral surface of the stator 52 are formed on the outer peripheral surface of the bearing holding member 53, and of the corner portions of the ridges 57 be in the press-in front chips A generated. In the process of pressing in front of the ridges 57 on the inner peripheral surface of the stator 52 also cavities 58 educated. So if the bearing support member 53 from above into the stator 52 is pressed (wherein the downward direction corresponds to the front in the press-fitting direction), the of the corner portions of the ridges 57 generated chips A reliable due to the cavities immediately below 58 be caught, with the same effects as in the embodiment are achieved.

This completes the description of the embodiment of the present invention, but the present invention is not limited to the embodiment or the other examples, and may be made according to the specifications of the structure or material of the components of the engine as needed 1 . 41 . 51 or the intended use of the engine 1 . 41 . 51 be modified.

In the embodiment described above, the burrs are 19 on the outer peripheral surface of the core 6 of the stator 3 formed, and the burrs 19 rub against the inner peripheral surface of the housing 2 However, there is no restriction in this regard. For example, the burrs 19 also fall off, and the outer peripheral surface of a shallow core 6 can be applied when pressing the inner peripheral surface of the housing 2 rub. Also in this case, by applying the first partitions 31 , based on 9 described flying around swarf A in the case 2 be prevented.

Also, the inner peripheral surface of the housing 2 smooth in the embodiment described above, but recessed grooves may be formed on the inner peripheral surface with the burrs 19 on the side of the stator 3 engage and restrict a relative rotation. Even if it comes in this case to a relaxation, no common rotation of the stator occurs 3 on, but it can be between the case 2 and the stator 3 to rattle. Therefore, it is important to ensure a sufficient amount of compression to prevent chattering by applying the present invention.

LIST OF REFERENCE NUMBERS

1

Brushless motor of the internal rotor type

2

Housing (press-)

3, 42, 52

stator

4, 44, 56

rotor

6

core

7

front insulator

14

permanent magnet

19, 45, 57

Burr (projection section)

20, 46, 58

Cavity (collecting section)

21

first partition

22

second partition

31

first partition

32

third partition

33

recessed groove

41, 51

brushless motor of external rotor type

A

shavings

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 4127865 [0007]

Claims (9)

A brushless motor in which a press-in member is fixed to one of the inner and outer circumference of a stator formed by winding a winding wire around a core in the press-in state, and to the other of which a rotor is disposed from the inner and outer circumference of the stator having a concentric with the stator axis of rotation and a permanent magnet, and by supplying the winding wire of the stator with current, a magnetic field is generated to exert rotational force on the rotor, characterized in that a collecting portion that collects chips by rubbing the stator and the Press-fitting occur to each other during pressing, is formed on a surface of the stator, which is opposite to the press-in. Brushless motor after Claim 1 , characterized in that the collecting portion is formed on the opposite surface of the stator in the pressing in front / rear with respect to the press-in further in the press-in front as the formation position of the chips. Brushless motor after Claim 2 , characterized in that the stator and the press-in element in a circumferential direction orthogonal to the pressing in front / behind during pressing rubbing in places and the collecting portion is formed in the circumferential direction of the counter-surface of the stator at least in a region corresponding to the friction points on the press-in. Brushless motor after Claim 3 , characterized in that the collecting portion is formed by a first partition, the front relative to the formation position of the chips due to the friction in the press-fitting relatively opposite and prevents the flying around of the chips in the press-fitting direction forward. Brushless motor after Claim 4 , characterized in that the catching portion is formed by the first partition wall and a second partition wall on both sides of the first partition wall in the circumferential direction, which prevents the flying around of the chips in the circumferential direction Brushless motor after one of the Claims 2 to 5 , characterized in that on the stator at least in the press-fitting front an insulator is attached, which maintains the insulation between the core and the winding wire, wherein the collecting portion is formed on the insulator. Brushless motor after Claim 6 , characterized in that the collecting portion of the insulator with respect to the friction point of the stator on the press-in further projecting to Einpresselementseite and is pressed in the compressed state of the stator and press-in elastic to the press-in. Brushless motor after Claim 4 , characterized in that the first partition wall extends around the entire circumference of the counter-surface of the stator. Brushless motor after Claim 8 characterized in that the stator allows a plurality of circumferentially spaced apart projection portions to rub along the presser member and the catching portion is a recessed groove formed by the first partition wall and a third partition wall in the press fitting direction behind the first partition wall by cooperation with the Projecting portions around the entire circumference of the counter-surface Stator continues to run and prevents flying around the chips in the direction of press-in to the rear.

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