JP2020171092A - Manufacturing method of assembly of magnet and housing with elastic deformability - Google Patents

Abstract

To provide a manufacturing method of press-fitting cylindrical bonded magnets, etc., capable of industrially mass-producing motor enclosures in which inner and outer diameters of a cylindrical part are not coaxial and outer diameters are not uniformly precise.SOLUTION: The present invention provides a manufacturing method of an assembly of a magnet and a housing with elastic deformability in which a housing has a bottomed cylindrical shape and includes a tapered portion expanding to an outer diameter side in a radial direction. A bottom of the housing has one end side outer end surface having a plane perpendicular to a central axis of an inner peripheral surface of a cylinder and is disposed to face the other end side surface, which is a plane of a housing shaft adjustment portion, with a gap in between, a tapered portion of an inner peripheral surface of the housing and one end side end of a magnet are disposed to face each other, an outer end surface on the other end side of the magnet and one end side end surface, which is a plane of the magnet shaft adjustment portion, are disposed to face each other, and at least one of the housing shaft adjustment portion and the magnet shaft adjustment portion is moved in a shaft direction and in a direction in which both come close to each other. Thereby, the magnet is pressed into the housing through an opening in the housing.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing an assembly of a magnet having elastic deformability and a housing, and a press-fitting device thereof, in which a magnet having elastic deformability including a tubular bond magnet and a tubular housing are integrated.

A bond magnet (hereinafter, appropriately referred to as a "bond magnet") formed by compression molding a compound composed of magnet powder and a thermosetting resin (binder) has a large degree of freedom in shape such as thinning. Therefore, for example, when a rare earth magnet powder capable of obtaining a large magnetic flux density, particularly an anisotropic rare earth magnet powder, is used as the bond magnet, there is a strong demand for high output, energy saving, miniaturization, weight reduction, etc. It is suitable as a permanent magnet for magnetism, and its demand is rapidly increasing.

Patent No. 4241209 Patent Gazette

Conventionally, a bond magnet (hereinafter, appropriately simply referred to as a magnet) has been attached to the inner peripheral surface of the housing by an adhesive. Therefore, 1) an adhesive which is an organic substance between the magnet and the inner peripheral surface of the housing. Due to the presence of the magnet and the coating layer, the magnetic resistance becomes large and the magnetic flux penetrating the armature becomes small, and its ability cannot be maximized. 2) Because the magnet is bonded to the inner peripheral surface of the housing with an adhesive. However, there is a problem that it takes time to manufacture.
On the other hand, Japanese Patent No. 4241209 discloses a technique of heating and press-fitting a cured ring-shaped anisotropic bond magnet into the inner peripheral portion of a motor housing. According to this technology, the magnet can be fixed to the housing without using an adhesive, and since it can be fixed without increasing the magnetic resistance, it has the effect of maximizing the magnetic flux supplied to the armature. Bonded magnet assemblies are widespread.

In recent years, with this increase in demand, there has been a strict demand for lowering the price of not only the bond magnet but also the entire member including the bond magnet. Here, in high-performance bonded magnets, it is difficult to obtain rare earth elements, which are the main raw materials, at low cost due to uneven distribution of resources and the like. Therefore, in order to respond to the price reduction, it is necessary to reduce the price of the entire bond magnet and the case in which the bond magnet is housed (case-integrated bond magnet).

Here, in terms of motor performance, the accuracy of the air gap, which is composed of the outer peripheral surface of the armature existing inside the motor and the inner peripheral surface of the magnet press-fitted into the magnetic housing that opposes it, greatly affects the motor performance. Affect. Therefore, the armatures and magnets used in the motor are required to have high machining accuracy on the opposing surfaces. In the case of press-fitting, since the bond magnet is press-fitted along the inside of the housing of the press-fitting destination, high dimensional accuracy is required inside the housing which is the press-fitting surface with the magnet. Further, it is required that the outer diameter of the magnet that becomes the press-fitting surface with the housing, the inner diameter of the magnet that finally becomes the constituent surface of the air gap, or the dimensional accuracy of the magnet thickness is high.
The design of the inner diameter of the housing and the inner and outer diameters of the magnet before press fitting can be designed from the deformation characteristics of the bond magnet at the processing temperature.

Normally, in the press-fitting process, the processing shaft on the press-fitting device side and the bottomed cylindrical housing or the central shaft of the magnet are adjusted as shown in FIG. 8, for example.
The processing shaft of the housing holding portion 6 and the processing shaft of the magnet holding portion 7 are coaxially positioned. The securing of these coaxials is ensured by forming the inner peripheral surfaces 81 and 721 of each holding portion coaxially formed on the processing shaft of each holding portion with high roundness and adjusting the axes. The bottomed cylindrical housing 8 and the cylindrical bond magnet 9 to be press-fitted have their inner peripheral surfaces 81 and 721 held with high processing accuracy in terms of roundness, coaxiality, inner diameter, and the like. By inserting it into the portion, it is necessary to process it so that the axis is adjusted according to the inner peripheral surface of the holding portion. Therefore, the outer peripheral surface 81 of the housing 8 and the outer peripheral surface 91 of the bond magnet 8 have the same shape that is slightly smaller than the shapes of the inner peripheral surfaces 81 and 721 of each holding portion, and have a shape with little dimensional variation. .. Further, the inner and outer peripheral surfaces of the cylindrical portion of the housing also need to have high coaxiality and cylindricity, and the inner and outer peripheral surfaces of the cylindrical bond magnet also need to have high coaxiality and cylindricity.

After preparing a member satisfying such a state, press-fitting is performed as follows. The processing shafts of the housing holding portion 6 and the magnet holding portion 7 that have been processed as described above are coaxially adjusted and installed. Then, with respect to the housing holding portion 6 having the inner peripheral surface 61 having high processing accuracy, the bottomed cylindrical housing 8 having the outer peripheral surface 81 having the same shape slightly smaller than the shape of the inner peripheral surface 61 is provided. Insert and hold the end face of the housing with the holder 10 from the side. As a result, the processing shaft and the central shaft of 8 of the bottomed cylindrical housing are aligned. Then, a cylindrical bond magnet 9 having a slightly smaller outer peripheral surface 91 having the same shape is inserted into the magnet holding portion 72 having the inner peripheral surface 721 having high processing accuracy from above the magnet holding portion 71. As a result, the processing shaft and the central shaft of the cylindrical bond magnet 9 are aligned. The opening-side end surface of the cylindrical portion of the bottomed cylindrical housing 8 has a chamfered portion 82.
In this state, when both holders are relatively moved in the machining axis direction, the bond magnet 9 is smoothly press-fitted because the bond magnet 9 is not overstressed because the coaxiality between the cylindrical bond magnet 9 and the bottomed cylindrical housing 8 is maintained. However, the durability of the press-fitting device can be maintained.

However, there is a demand for lower prices for these motors, and various processing methods for housings with lower processing costs have been proposed. In that case, although the machining accuracy of the inner peripheral surface is ensured, the outer peripheral surface may not be secured. In such a case, the accuracy of the outer diameter of the housing is significantly reduced, or the coaxiality of the inner and outer diameters of the housing is significantly reduced, resulting in a large dimensional variation among individual parts.
At this time, if the above-mentioned conventional processing method is applied, even if one can be processed by adjusting the processing axis of the press-fitting device as a whole according to an arbitrary housing, the coaxiality may vary from housing to housing. Since the outer diameter dimension also varies, the processing axis on the housing side is not constant, and if processing is performed with the same press-fitting device positioned, the magnet will be broken and the mold will be damaged.
In order to avoid this, if the above-mentioned processing shafts are adjusted for each housing, industrial production cannot be established.

Therefore, the present invention has an inner diameter coaxiality and high dimensional accuracy, but has an elastic deformability that enables industrial production of press fitting into a low-priced housing having low outer diameter coaxiality and dimensional accuracy. And a method of manufacturing the housing assembly.

As a result of diligent research to solve this problem, the present inventors have recognized that it is difficult to improve the dimensional accuracy of the processing target and the holding portion and to adjust the axis between the holding portions as in the conventional case. There was. Then, the completely opposite idea, that is, by setting a surface that serves as a reference for axis alignment while maintaining mobility between the processing target and the holding portion (hereinafter referred to as the shaft adjusting portion in the present invention), the shaft When the housing shaft adjusting part, the housing, the bond magnet, and the magnet shaft adjusting part are brought close to each other in the direction, the housing and the bond magnet move due to the elastic deformability of the bond magnet, so that the housing is moved to the processing shaft of the shaft adjusting part. The present invention has been reached as a result of examination based on the idea that the central axis and eventually the central axis of the magnet may be automatically centered. Since the present invention is possible as long as the magnet has a predetermined elastic deformability, the magnet is not limited to the bond magnet, and may be a metal alloy magnet such as an alnico magnet or a FeCrCo alloy magnet.

<< Manufacturing method of assembly of magnet and housing with elastic deformability >>
The method for manufacturing an assembly of a magnet having elastic deformability and a housing according to the present invention is a method of press-fitting a magnet having elastic deformability (hereinafter, simply referred to as a magnet in this paragraph) into a housing for a motor. In the method of manufacturing the assembly of the above, the housing has a bottomed cylindrical shape, and the housing extends from the bottom in the direction of the central axis and has a coaxiality with respect to the central axis. It has an accommodating portion for accommodating a magnet having a surface, and at least the inner peripheral surface of the housing has a tapered portion whose diameter expands to the radial outer diameter side toward the other end side in the axial direction of the accommodating portion. The outer end surface on one end side of the housing has at least three independent plane portions in a virtual plane perpendicular to the central axis of the inner peripheral surface of the cylinder, the magnet is cylindrical, and the other end surface of the magnet is the cylinder. It has at least three independent planes in a virtual plane perpendicular to the central axis of the inner peripheral surface, the outer diameter of the magnet is smaller than the inner diameter of the inner end on the opening side of the housing, and the inner diameter of the inner peripheral surface of the cylinder having the coaxiality. In the preparatory step of preparing the magnet having a larger outer diameter of the cylinder, and at the time of contact with the housing, the virtual plane is shared by the outer end surface on one end side of the housing, and the one end side that contacts each independent plane portion. A housing shaft adjusting portion having at least three independent plane portions on the inner end surface and composed of a member extending in at least a vertical direction from each independent plane portion to one end side in the axial direction, and a magnet at the time of contact with the magnet. The virtual plane is shared by the other end faces of the above, and at least three independent plane portions are provided on the one end side end face that abuts on each independent plane portion, and at least in the direction perpendicular to the other end side in the axial direction from each one end side end face. It is a method of manufacturing an assembly of a magnet and a housing having an elastic deformability, which is characterized by providing a magnet shaft adjusting portion composed of a member extending to.

In this specification, the position and the like of each member are specified with the housing shaft adjusting portion side of the press-fitting device as one end side and the magnet shaft adjusting portion side facing the other end side as appropriate. Further, in the present specification, the shape, position, and the like of each member are specified with the cylindrical coordinates (r, θ, z) in mind as appropriate. The central axis (z-axis) in the housing axis adjustment part and magnet axis adjustment part is called the processing axis, the central axis (z-axis) in the housing and bond magnet is simply called the central axis, and the extending direction is the axial direction (axial direction). (Z direction). The radial direction orthogonal to the central axis is called the radial direction (r direction). The direction around the central axis is called the circumferential direction (θ direction).

In the radial direction, the side closer to the central axis (the side where r is small) is called the small diameter side, the inner peripheral side, or the inside. In the radial direction, the side far from the central axis (the side where r is large) is called the large diameter side, the outer peripheral side, or the outside. Further, in each member, the part closest to the central axis or the center (center on the central axis) is called the inner peripheral end (part) or the inner end (part), and the part farthest from the central axis or the center is the outer peripheral end (part). Part) or outer edge (part). In the axial direction, the side closer to the center is called the inside, and the side far from the center is called the outside.

Further, the bottomed cylindrical shape here means that the cylindrical body has an overhanging portion (bottom portion) inward in the radial direction on one end side on the opening side. Then, at least a part of the overhanging portion (bottom portion) in the radial direction constitutes the outer end surface on one end side of the housing. In this case, the cylindrical body and the overhanging portion may be one component or a plurality of components. The overhanging portion may form a surface or may have a shape having an opening. Further, the bottom portion has an independent flat surface portion for parallelizing the central axis of the housing and the processing axis of the housing shaft adjusting portion in the housing shaft adjusting portion of the present invention, or the independent flat surface portion. It includes a plane containing. Therefore, for example, even when the bottom portion and the cylindrical body (part) are composed of two parts and three or more independent plane portions having only one end side end face of the cylindrical portion, or the one end end face is composed of one plane. The part is not only a cylinder (part) but also a bottom.
The bottom portion in the present invention includes a case where there is no portion corresponding to the so-called bottom portion and only one end side end surface of the cylindrical portion is the bottom portion. The magnet having elastic deformability is appropriately described as a magnet, a bond magnet, a cylindrical bond magnet, or the like in the present specification.

By adopting the method of manufacturing the assembly of the magnet and the housing having the elastic deformability of the present invention, the housing shaft adjusting portion, the housing, the magnet, and the magnet shaft adjusting portion are arranged at predetermined positions, and the housing is By making the body axis adjustment part and the magnet axis adjustment part relatively close to each other, it has the coaxiality of the inner diameter and high dimensional accuracy, but the coaxiality and dimensional accuracy of the outer diameter are low, and it is a cylinder to a low-priced housing. For press-fitting magnets with elastic deformability (especially bond magnets, etc.), the coaxiality of the inner and outer diameters of each housing is deviated or the outer diameter dimensions are different as in the past. When setting in the press-fitting device, it is possible to continuously press-fit without processing the inner surface of the holding magnet of the housing or by aligning the processing axis according to the housing and then press-fitting. It is possible to provide a method for manufacturing an assembly of a magnet and a housing having an elastic deformability suitable for industrial production.

Here, the main action of a method for manufacturing an assembly of a magnet having elastic deformability and a housing will be described. Since the movement of each member inside the press-fitting device cannot be observed, it is not clear why the action and effect of the present invention were obtained, but the effect is considered to be as follows. .. Further, although it is not necessarily technically essential, in order to explain the operation and effect of the present invention in an easy-to-understand manner, as a premise, the processing shaft of the housing shaft adjusting portion and the processing shaft of the magnet shaft adjusting portion of the present invention are It will be described below assuming that they are positioned coaxially (both share a coaxial processing axis). Furthermore, the present invention does not limit the machining axis in the vertical direction, and can have the machining axis in any direction such as the horizontal direction.
The press-fitting process in which the housing shaft adjusting portion and the magnet shaft adjusting portion, which are the press-fitting devices in the present invention, and the housing and the bond magnet, which are the objects to be machined by using the press-fitting device, can be assumed from their configurations. Will be described by showing the effects produced by the application of.

First, each independent flat surface portion on the other end side end surface of the housing shaft adjusting portion and each independent flat surface portion on the one end side outer end surface of the housing are arranged so as to face each other with a space, for example. Further, the tapered portion on the inner peripheral surface of the housing is arranged so that the one end side end of the magnet can face each other. Further, each independent flat surface portion on the other end side end surface of the magnet and each independent flat surface portion on the one end side end surface of the magnet shaft adjusting portion are arranged so as to face each other. Here, to be able to face each other means that when these members are directly or indirectly brought close to each other in the coaxial machining axis direction, their surfaces (including points) come into contact with each other after a predetermined time has elapsed. Means. After that, at least one of the housing shaft adjusting portion and the magnet shaft adjusting portion is relatively moved so as to be close to each other in the coaxial processing axis direction.

In that case, the cylindrical bond magnet penetrates into the inside of the housing without being blocked by the end surface of the opening of the housing, and comes into contact with the tapered portion formed on the inner peripheral surface of the housing at an arbitrary position. Here, the first contact is not always the above point. In some cases, it abuts on a member existing on the other end side of the tapered portion of the housing, and continuously abuts on the tapered portion while sliding. Due to the further relative movement, the outer end on one end side of the housing comes into contact with the end surface on the other end side of the housing shaft adjusting portion. In this state, the relationship between the axes has not changed.

Further, when both axis adjusting parts are relatively close to each other in the coaxial processing axis direction, a space is created between the housing axis adjusting part and the housing in the front of one end side of the housing and in the radial direction perpendicular to the coaxial processing axis. Therefore, the housing rotates around the outer end on one end side of the housing as a fulcrum. Therefore, the other end side end surface, which is the reference plane for the axis alignment of the housing shaft adjusting portion, and the one end side outer end surface, which is the reference plane for the axis alignment at the bottom of the housing, can come into contact with each other.
At this time, at least three or more independent flat surfaces on the outer end surface on one end side of the housing and at least three independent flat surfaces on the other end surface of the housing shaft adjusting portion are brought into contact with each other, so that the coaxial processing shafts are mutually coaxially processed. It will share a virtual plane perpendicular to. As a result, the processing shaft of the housing shaft adjusting portion and the central axis of the housing are aligned in parallel in the axial direction (hereinafter, appropriately referred to as parallel alignment). At this time, it is assumed that the housing is often moved perpendicular to the machining axis, but this does not prevent the parallel alignment. At this time, it remains deviated in the direction perpendicular to the axial direction of both axes.

Here, the vertical plane of the housing shaft adjusting portion with respect to the (coaxial) machining shaft is formed by positioning each independent flat surface portion on the other end surface of the housing shaft adjusting portion perpendicular to the (coaxial) machining shaft. .. Here, the reason why the contact between at least three surfaces included in the same virtual plane is defined is that the accuracy of the surfaces cannot be uniquely obtained unless the contact is made with at least three surfaces. The reason why the contact between both sides is not a point but a surface is that the contact between points is too difficult to position.

Here, at the same time, the same action occurs between the magnet shaft adjusting portion and the magnet having the same positional relationship as between the housing shaft adjusting portion and the housing. Since there is space in front of one end of the magnet and in the radial direction perpendicular to the coaxial processing axis, the magnet can rotate with the outer end on the other end of the magnet as a fulcrum. Therefore, the end surface on one end side, which is the reference plane for alignment of the magnet shaft adjusting portion, and the outer end surface on one end side, which is the reference plane for alignment on the other end surface of the magnet, can come into contact with each other.
At this time, at least three or more independent plane portions on the outer end surface on the other end side of the magnet and at least three or more independent plane portions on the end surface on one end side of the magnet shaft adjusting portion abut each other so as to be perpendicular to the coaxial processing axis. Virtual plane will be shared. As a result, the processing shaft of the magnet shaft adjusting portion and the central shaft of the magnet are aligned in parallel in the axial direction.

On the other hand, the movements of the housing K, the magnet M, and the magnet shaft adjusting unit 2 that are linked to the movement of the housing will be described. Here, again, from the state described in paragraph number 19, at least one of the housing shaft adjusting portion and the magnet shaft adjusting portion is relatively moved so as to be close to each other in the coaxial processing axis direction.
Only the tapered portion on the inner peripheral surface of the housing is in contact with the outer end on one end side of the outer peripheral surface of the magnet, but the other surface creates a space between the inner peripheral surface of the housing and the outer peripheral surface of the magnet. Have. Therefore, when both axis adjusting portions are relatively close to each other in the axial direction, when the housing on one end side is viewed from the magnet at the same time as the rotation of the housing, one end side of the magnet, which is the relative movement direction of the magnet, is viewed. Since there is also space in the radial direction perpendicular to the front and coaxial machining axes, the magnet can tilt along the central axis of the housing or move in the direction perpendicular to the machining axis. This is because, at the same time, when looking at the magnet on the other end side from the housing, there is space in the front of the other end side of the housing, which is the relative movement direction of the housing, and in the radial direction perpendicular to the coaxial processing axis. The housing can tilt along the central axis of the magnet or move in a direction perpendicular to the machining axis. Due to the high degree of freedom of changing the posture and movement of these housings and magnets, the magnet moves the tapered part relatively to one end side in the coaxial processing axial direction while the both axis adjustment parts are moving in the proximity direction. It is thought that it has the effect of guiding the central axis of the housing and the central axis of the magnet to be gradually coaxialized and aligning them (hereinafter referred to as coaxial alignment).

Then, when the one end side end of the bond magnet moves relative to the accommodating portion accommodating the bond magnet having the inner peripheral surface of the cylinder having the coaxiality with respect to the central axis, the relative pressing pressure is also large. The parallel alignment of the housing axis adjustment part and the central axis of the housing and the parallel alignment of the central axis of the magnet axis adjustment part and the magnet are completed, and at the same time, the central axis of the housing and the central axis of the magnet are coaxial. It seems that the alignment has been completed. Which alignment starts first and which ends first depends on various factors such as the initial position of the housing and magnet with respect to the center of the processing axis, the inclination angle of the housing and magnet arrangement, and the taper angle. I think that the.

In this description, for example, in the positional relationship between the housing shaft adjusting portion and the housing, a space is provided between the two, but if necessary, the housing shaft adjusting portion and a part of the housing are used. They may be in contact with each other, or they may be in contact with each other in advance in various arrangements. In that case, the action and effect do not change in the former, and in the latter, the parallel alignment between the housing axis adjustment part and the housing is completed first, and then the coaxial alignment between the housing and the magnet is completed. And the effect of parallel alignment of the magnet and the magnet shaft adjusting part. The same applies to the positional relationship between the housing and the magnet, and the magnet and the magnet shaft adjusting part.

As a condition for the effects of these inventions to occur, the magnet must have an elastic deformability, and the higher the elastic deformability, the more preferable. In the case of a bond magnet, the resin used for the bond magnet is preferably a thermosetting resin, and it is preferable that a thermosetting treatment (cure treatment) is performed after the resin is formed into a cylindrical bond magnet. If this is not the case, the magnet may not be able to withstand the large elastic deformation that it receives when it is centered with respect to the inner peripheral surface of the housing, and the strength may be insufficient. It is a metal alloy magnet such as an alnico magnet or a FeCrCo alloy magnet and has sufficient elastic deformability.
Further, it is desirable to heat the housing and the bond magnet to a predetermined temperature at the time of press fitting. If it is not heated, the magnet may not be sufficiently deformable and the magnet may be damaged. Further, as a result, if the deformability is small, the press-fitting allowance is small, so that the magnet tends to easily come off from the housing.

The effects of the above invention have been described on the premise that the processing shaft of the housing shaft adjusting portion and the processing shaft of the magnet shaft adjusting portion of this embodiment are coaxially positioned.
However, as is clear from the above explanation, the axis deviation in the direction perpendicular to the axis of the processing axis of the housing axis adjusting portion and the magnet axis adjusting portion allows the magnet to be inserted into the housing even if there is an amount of axis deviation. Yes, press-fitting is established as long as the housing and the magnet can be pressed in a direction relatively parallel to each other in the machining axis direction while holding the magnet.
Therefore, when the minimum diameter D1min including the variation of the inner diameter D1 of the opening end face of the housing and the maximum diameter dmax including the variation of the outer diameter d of the bond magnet are set, the housing is acceptable in order to facilitate the axis adjustment. The permissible amount of axis deviation in the direction perpendicular to the axis of the processing axis of the axis adjusting unit and the magnet axis adjusting unit is, for example, δs1 when one is assumed to be a coaxial processing axis. Further, the maximum allowable increase in outer shape in the projected shape on a plane perpendicular to the coaxial processing axis of the housing or the like due to the central axis of the housing K or the magnet M being inclined from the processing axis is δs2. Further, the allowable axis deviation amount of the central axes of both in the direction perpendicular to the coaxial processing axis depending on the arrangement position of the magnet M and the housing K is defined as δs3. In that case, the maximum allowable axis deviation amount ΔS = δs1 + δs2 + δs3 with respect to the appropriately selected coaxial processing axis.
In that case, Dmin> dmax + ΔS is established, and if the above-mentioned dimensions are managed in addition to the various dimensional relationships of the present invention, the time-consuming adjustment of the processing shafts of the housing shaft adjusting portion and the magnet shaft adjusting portion can be shortened. Can be done. It should be noted that each deviation amount δs can be set in the reduction direction by a known means. For example, in the case of δs2, it is possible by narrowing the space between the outer peripheral surface of the housing and the inner peripheral surface of the housing holding portion.

Further, even when the processing shafts of the housing shaft adjusting portion and the magnet shaft adjusting portion are tilted, it is necessary to feed the other end surface of the magnet to the accommodating portion (coaxiality required portion) in the housing. A certain amount of shaft within the range of the shape of the peripheral surface (including various dimensions and dimensional accuracy), the outer diameter shape of the end face on one end side of the magnet shaft adjustment part (including various dimensions and dimensional accuracy), and the elastic deformability of the bond magnet, etc. Misalignment is acceptable.
Therefore, in the present invention, the alignment of the processing shafts of the housing shaft adjusting portion and the magnet shaft adjusting portion is not an essential condition.
However, it is desirable that the processing shaft (central shaft) of the housing shaft adjusting portion and the magnet shaft adjusting portion are parallel. Further, it is desirable that the processing shaft (central shaft) of the housing shaft adjusting portion and the magnet shaft adjusting portion is coaxial.

It is a front sectional view which shows the state which the housing is supported by the holding jig in the press-fitting process while schematically showing the press-fitting apparatus of an Example. In the press-fitting process, when one end of the magnet comes into contact with the inner peripheral surface of the housing and then the magnet is pushed up to one end, the one end of the housing becomes the other end of the adjustment part of the housing shaft adjustment part. It is a front sectional view which shows the state of contact with a side end face. In the press-fitting process, when the magnet is further pushed up to one end side, the coaxial processing shaft of the housing shaft adjusting portion and the magnet shaft adjusting portion and the central axis of the housing are aligned in parallel, and the central axis of the magnet is the housing. It is a front sectional view which shows the state of having been coaxially aligned with the central axis of. It is a top view of the housing of the modified example. While schematically showing the press-fitting device of the modified example, it is a front arrow view of the AA cross section of the housing of the modified example of FIG. 4 as viewed from the direction of the arrow in order to show the press-fitting process. It is a front sectional view of the housing of a modification. It is a front sectional view which shows the state after the parallel alignment and the coaxial alignment corresponding to FIG. 3 in the case of the example in the press-fitting process in the case of the modification of FIG. Front sectional view illustrating a conventional press-fitting device and a press-fitting process

One or more components arbitrarily selected from the matters described herein may be added to the configuration of the present invention described above. Whether or not which embodiment is the best depends on the target, required performance, and the like. A component related to a manufacturing method can also be a component related to a product.

The present invention further relates to a magnet and a housing having elastic deformability, characterized in that the outer end surface on one end side of the housing has a continuous plane including at least three independent plane portions perpendicular to the central axis of the inner peripheral surface of the cylinder. It is a method of manufacturing a body assembly. If the outer end surface on one end side of the housing has a continuous flat surface in this way, it is easy to manufacture, and it can be easily positioned with at least three independent flat surfaces on the end surface on the other end side of the housing shaft adjusting portion. Can be done.

The housing in the present invention can be made of a magnetic material. Further, it can be a soft magnetic material. For example, it can be a soft magnetic material made of iron or a metal alloy containing a large amount of iron. However, since the soft magnetic material is physically soft, the inner peripheral surface of the housing is a sliding surface, so that surface treatment and surface treatment for smooth sliding can be performed.

The present invention further manufactures an assembly of a magnet and a housing having elastic deformability, characterized in that the housing shaft adjusting portion has a continuous flat surface including at least three independent plane portions on the other end surface. The method. As described above, if the housing shaft adjusting portion has a continuous flat surface on the other end surface, it can be easily manufactured and easily positioned with at least three independent flat surfaces on the outer end surface on one end side of the housing. can do.

The present invention further describes a magnet and a housing having elastic deformability, wherein the other end surface of the magnet has a continuous plane including at least three independent plane portions perpendicular to the central axis of the inner peripheral surface of the cylinder. It is a manufacturing method of the assembly of. When the other end surface of the magnet has a continuous flat surface in this way, it is easy to manufacture, and it can be easily positioned with at least three independent plane portions on the one end side end surface of the magnet shaft adjusting portion.

The present invention further relates to a method for manufacturing an assembly of a magnet and a housing having elastic deformability, wherein the magnet shaft adjusting portion has a continuous flat surface portion including at least three independent flat surface portions on one end side end surface. Is. As described above, the magnet shaft adjusting portion can be easily manufactured if the one end side end face has a continuous flat surface, and can be easily positioned with at least three independent plane portions on the other end side end face of the magnet. it can.

The present invention is characterized in that the magnet shaft adjusting portion has a circular continuous plane including at least three independent plane portions on the one end side end surface, and supports the other end side end surface of the magnet over the entire circumference. This is a method for manufacturing an assembly of a magnet and a housing having elastic deformability. As a result, uniform pressure is applied to the magnet, and damage to the magnet during press fitting is prevented. For example, when the housing shaft adjusting portion and the magnet shaft adjusting portion are arranged in the vertical direction, they are unlikely to fall off when the magnet is set in the magnet shaft adjusting portion.
Further, if the magnet shaft adjusting portion is made cylindrical, the magnet shaft adjusting portion can be made relatively small.

The present invention is a magnet having an elastic deformability, characterized in that the magnet shaft adjusting portion has a circular flat surface on the end surface on one end side and a convex portion on the one end side in the axial direction inside the circle. This is a method for manufacturing an assembly of a housing. As a result, when the magnet is set in the magnet shaft adjusting portion, for example, when the housing shaft adjusting portion and the magnet shaft adjusting portion are arranged in the vertical direction, the magnet can be installed more reliably without falling off or tipping over.

The present invention is a magnet shaft adjusting portion in which the continuous plane of the magnet shaft adjusting portion on one end side end surface is circular, and the inside of the circle has a columnar or cylindrical convex portion on one end side in the axial direction. , The convex portion is a method for manufacturing an assembly of a magnet and a housing having an elastic deformability, which is characterized in that the convex portion is separated from the inner peripheral surface of the magnet by a predetermined distance. In the case of the present invention (basic invention), basically, a space of the predetermined distance is provided, and after the cylindrical magnet comes into contact with the tapered portion of the housing, the central axis of the magnet is aligned with the central axis of the housing. Therefore, one end side of the cylindrical magnet undergoes a large deformation. In particular, when the thickness of the bond magnet is thin, the strength of the bond magnet may be insufficient if the degree of shaft adjustment is too high. In such a case, the above limitation can limit the amount of change and movement of the bond magnet, so that excessive stress is not applied to the magnet when the bond magnet is centered along the tapered portion. , The strength of the thin cylindrical bond magnet can be improved.

In the present invention, the magnet shaft adjusting portion has a cylindrical shape having a continuous plane including at least three independent plane portions as a top surface on the one end side end surface, and covers the other end side end surface of the magnet over the entire circumference. It is a method of manufacturing an assembly of a magnet and a housing having elastic deformability, which is characterized by supporting. As a result, the magnet shaft adjusting portion can be made small.

The present invention comprises an assembly of a magnet and a housing having elastic deformability, characterized in that the outer diameter of at least one end side end surface of the magnet shaft adjusting portion is smaller than the (average) outer diameter of the magnet. It is a manufacturing method. As a result, the magnet can be reliably press-fitted to the vicinity of the housing portion of the housing.

The present invention is a method for manufacturing an assembly of a magnet having elastic deformability and a housing, characterized in that the outer diameter of the magnet shaft adjusting portion is smaller than the inner diameter of the housing portion of the housing. As a result, the magnet can be reliably press-fitted to the housing portion of the housing.

The present invention further relates to a method for manufacturing an assembly of a magnet and a housing having elastic deformability, wherein the tapered portion of the housing has an extending portion parallel to the axis on the other end side in the axial direction. Is. If the tapered portion of the housing has an extending portion parallel to the axis on the other end side in the axial direction, the magnet can be inserted into the press-fitting device including the housing shaft adjusting portion and the magnet shaft adjusting portion. The arrangement becomes easy, and the magnet can be prevented from falling off or tipping over in the press-fitting device regardless of whether the processing shaft is vertical or horizontal.

The present invention is a method for manufacturing an assembly of a magnet and a housing having elastic deformability, wherein the parallel extending portion of the housing has an inner diameter larger than the outermost diameter of the bonded magnet. is there. By doing so, the arrangement of the housing on the press-fitting device including the housing shaft adjusting portion and the magnet shaft adjusting portion is more reliable, and the housing and the magnet regardless of whether the processing shaft is vertical or horizontal. Can be prevented from falling off or tipping over in the press-fitting device.

<< Bond Magnet >>
The magnet having elastic deformability is preferably a bonded magnet.
The bond magnet may be an anisotropic bond magnet composed of anisotropic magnet particles and (binder) resin, or an isotropic bond magnet composed of isotropic magnet powder and binder resin. Various things can be used as the magnet particles. It is preferable that at least rare earth magnet particles having excellent magnetic properties are contained in the bond magnet. Examples of the rare earth magnet particles include Nd-Fe-B magnet particles, Sm-Fe-N magnet particles, SmCo magnet particles, and the like. Further, the magnet particles are not limited to a single type, and may be a mixture of a plurality of types.

As the resin, a thermosetting resin is basically used. The weight ratio of the thermosetting resin in the bond magnet is preferably 2 W% or more and 4 W% or less. This is because press-fitting can be easily performed. As the resin of the bond magnet, a thermosetting resin having high fluidity and thermosetting during molding in a heating magnetic field is used. Specifically, bisphenol A type, phenol novolac type epoxy resin, and polycyclic epoxy resin are used, but known thermosetting resins can be used.

Molding of a cylindrical bond magnet is usually produced by a known method in which a mixture (compound) of magnet powder and resin is filled in a cavity of a mold and molded in an orientation magnetic field. The formed bond magnet is cured under known heating conditions and then subjected to press-fitting at a known heating temperature. For example, the heating temperature at the time of press fitting is about 60 to 100 ° C. The press-fitting temperature and the like are appropriately changed depending on the type of resin and the like.

In this embodiment, the press-fitting device used for press-fitting the cylindrical anisotropic rare earth bond magnet M into the accommodating portion having the coaxiality of the inner peripheral surface of the bottomed cylindrical housing K and the manufacturing process thereof. The present invention will be described more specifically. Since the movement of each member inside the press-fitting device cannot be observed, it is not clear why the action and effect of the present invention were obtained, but the effect is considered to be as follows. ..

A schematic diagram of the press-fitting device is shown in FIG. For convenience of explanation, one end side and the other end side are shown in FIG.
The press-fitting device includes a housing shaft adjusting portion 1, a magnet shaft adjusting portion 2, and a holding portion (not shown) having a function of adjusting the machining axis of the housing shaft adjusting portion while holding the housing shaft adjusting portion. It is composed of a holding portion (not shown) having a function of adjusting the processing shaft of the housing shaft adjusting portion while holding the magnet shaft adjusting portion 2.
Here, the processing shaft of the housing shaft adjusting unit 1 and the processing shaft of the magnet shaft adjusting unit 2 are coaxially positioned in the vertical direction. The alternate long and short dash lines in FIGS. 1 to 3 and 5 show the coaxial processing shaft A1 of the housing shaft adjusting portion 1 and the magnet shaft adjusting portion 2 which are coaxial. The present invention does not limit the machining axis in the vertical direction as in the present embodiment, but can have the machining axis in any direction such as the horizontal direction. The housing shaft adjusting portion 1 has a bottomed cylindrical body, has an adjusting portion 11 and a holding portion 12, the holding portion 12 has a cylindrical inner peripheral surface 121, and the other end side has a cylindrical inner peripheral surface 121. It has an opening.
Further, the magnet shaft adjusting portion 2 has a columnar shape.

The housing K has a bottomed cylindrical shape, and the housing K extends from the bottom KB in the direction along the central axis A2 of the housing K indicated by the alternate long and short dash line, with respect to the central axis A2. It has an accommodating portion K12 for accommodating a bond magnet M having a cylindrical inner peripheral surface K11 having coaxiality, and the inner peripheral surface K1 of the housing K is on the radial outer diameter side toward the other end side in the axial direction of the accommodating portion K12. It has a tapered portion K13 that expands in diameter. The outer end surface KB1 on one end side of the housing K has a plane perpendicular to the central axis A2 of the inner peripheral surface K1 of the cylinder. The one end side outer end surface KB1 which is this plane has at least three independent plane portions in a virtual plane perpendicular to the central axis A2 of the inner peripheral surface K1 of the cylinder, and corresponds to a continuous plane including at least three independent plane portions. To do.

On the other hand, the bond magnet M has a cylindrical shape, and the other end surface ME1 of the magnet M has a plane perpendicular to the central axis A3 of the inner peripheral surface M1 of the cylinder of the magnet M shown by the thick broken line. The other end surface ME1 which is this plane also corresponds to a continuous plane including at least three independent plane portions perpendicular to the central axis A3 of the cylindrical inner peripheral surface M1 of the magnet M. Since the outer end surface KB1 on one end side of the housing K and the other end surface ME1 on the other end side of the magnet M have a flat surface in this way, both are easy to manufacture, and the other ends of the housing K and the housing shaft adjusting portion 1 It is not necessary to position the magnet M in the circumferential direction for parallel alignment on the side end surface 11E1, and the same applies to the positioning in the circumferential direction on the end surface 2E1 on one end side of the magnet M and the magnet shaft adjusting portion 2.

Further, the outer diameter d of the magnet M is smaller than the inner diameter D1 of the inner end on the opening side of the housing. As a result, the magnet M can smoothly penetrate into the housing K and can be press-fitted later. The magnet M and the housing K may be inclined with respect to the coaxial processing shaft A1, and in that case, the inner diameter D1 is appropriately increased in consideration of this. Even if the center of gravity of the magnet and the center of gravity of the housing deviates in the direction perpendicular to the coaxial processing axis, the inner diameter D1 is appropriately increased in consideration of this. The magnet has a magnet outer diameter d larger than the inner diameter D2 of the accommodating portion K12 having the coaxiality thereof. As a result, the magnet M and the housing K are centered, and when the magnet M is press-fitted into the housing K, a press-fitting allowance is generated to prevent the magnet M from falling out of the housing K.

The housing shaft adjusting portion 1 has a bottomed cylindrical shape, and the other end surface 11E1 of the adjusting portion 11 has a flat surface perpendicular to the coaxial processing shaft A1.
As a result, when the one end side outer end surface KB1 which is the flat surface of the housing K and the other end side end surface 11E1 which is the flat surface of the housing shaft adjusting portion 1 come into contact with each other as surfaces, the coaxial processing shaft A1 of the housing shaft adjusting portion 1 The central axis A2 of the housing 1 can be aligned in parallel.
Further, as described above, since the other end surface 11E1 is flat, positioning of the contact surface in the circumferential direction at the time of contact with the housing K becomes unnecessary.

The magnet shaft adjusting portion 2 has a columnar shape, and the end surface 2E1 on one end side thereof has a plane perpendicular to the coaxial processing shaft A1.
As a result, when the other end surface ME1 which is the flat surface of the magnet 2 and the one end side end surface 2E1 which is the flat surface of the magnet shaft adjusting portion 2 come into contact with each other as surfaces, the coaxial processing shaft A1 of the magnet shaft adjusting portion 2 and the center of the magnet 2 The axis A3 can be aligned in parallel.
Further, as described above, since the one end side end surface 2E1 is flat, it is not necessary to position the contact surface in the circumferential direction at the time of contact with the housing K.

As described above, after the device and the member are prepared, the housing shaft adjusting portion 1, the housing K, the magnet M, and the magnet shaft adjusting portion 2 are formed from one end side to the other end side as described below. Arrange as follows.
The housing K is inserted from the opening of the housing shaft adjusting portion 1 located on one end side in the vertical axis direction with the outer end surface KB1 on one end side of the housing K facing one end side. After that, by locating the holding jig 3 radially inward from below (the other end side) of the housing shaft adjusting portion 1, the housing K is held by the other end side end surface KO1.
As a result, the posture of the housing K is maintained and it is prevented from falling off.
At that time, the other end side end surface 11E1 having a flat surface of the housing shaft adjusting portion 1 and the one end side outer end surface KB1 having a flat surface at the bottom portion KB of the housing K are arranged so as to face each other with a space (hereinafter referred to as arrangement 1). To tell.). As a result, during press fitting of the magnet M, both the housing K and the magnet M have a greater degree of freedom in being able to tilt with respect to the machining axis and move in the direction perpendicular to the machining axis, and the centering function is high. it can. In this embodiment, a space is provided between the housing shaft adjusting unit 1 and the housing K, but the housing shaft adjusting unit 1 and the housing K may be partially in contact with each other at the time of arrangement. , It may be in contact with the entire surface in advance.

Further, the other end surface ME1 of the magnet M is arranged on the one end side end surface 2E1 of the magnet shaft adjusting portion 2 facing the opening of the housing shaft adjusting portion 1 (hereinafter, referred to as arrangement 3). At this time, when the distance between the housing shaft adjusting portion 1 and the magnet shaft adjusting portion 2 is made relatively close in the coaxial processing axis direction, the magnet M is arranged at a position where it can pass through the opening of the housing K. To do. As the positioning method, a known method can be utilized. As a result, the central axis A3 of the magnet M and the coaxial processing axis A1 of the magnet axis adjusting portion 2 are aligned in parallel, but are not coaxial.
Then, the distance between the housing shaft adjusting portion 1 and the magnet shaft adjusting portion 2 is relatively close in the axial direction. Here, since the outer diameter d of the magnet M is smaller than the inner diameter D1 of the inner end on the opening side of the housing, the magnet M is not blocked by the end surface KO1 of the opening of the housing K and is along the inner peripheral surface K14 on the other end side. It is possible to invade the inside of the housing K. Further, when both are relatively close to each other in the axial direction, the tapered portion K13 of the inner peripheral surface K1 of the housing K and the one end side end MO11 of the magnet M are arranged so as to face each other (hereinafter referred to as arrangement 2). .. As a result, in the subsequent press-fitting step, the magnet M comes into contact with the tapered portion of the housing K, and the press-fitting step can be executed. At this stage, in FIG. 1, the above-mentioned arrangement 1, arrangement 2, and arrangement 3 are simultaneously realized.
It should be noted that these arrangements are only shown as an example, and it is not always necessary to take such an arrangement in order to obtain the effect of this embodiment. For example, the magnet M may first come into contact with the inner peripheral surface K14 of the housing K, and then the housing K is inclined toward the side opposite to the side in contact with the magnet M and one end of the housing K. The side end KB1 may come into contact with the inner peripheral surface 121 of the cylindrical body 12 of the housing shaft adjusting portion 1.

Further, when the distance between the housing shaft adjusting portion 1 and the magnet shaft adjusting portion 2 is relatively close in the axial direction, the magnet M and the housing K abut at the point KA on the inner peripheral surface K13 as shown in FIG. .. Due to the further relative movement, the outer end KB11 on one end side of the housing K comes into contact with the other end surface 11E1 of the housing shaft adjusting portion 1.
In this state, the relationship between the axes has not changed.

Further, when both axis adjusting portions are relatively close to each other in the axial direction, as a result, as shown in FIG. 3, the central axis A3 of the magnet and the central axis A2 of the housing K are coaxially processed axes A1 of both axis adjusting portions. The central axis A3 of the magnet is coaxially aligned with the central axis A2 of the housing K.
As a result, when both axis adjusting portions are brought relatively close to each other in the axial direction, the press-fitting process can proceed along the inner peripheral surface K11 at which the magnet has coaxiality without applying excessive stress to the magnet M. it can.

Although the concept of the centering mechanism has been described in detail earlier, this embodiment will be described.
From the state of FIG. 2, when both axis adjusting portions are further brought close to each other in the axial direction, the housing shaft adjusting portion 1 and the housing K are perpendicular to the front end side of the housing and the coaxial processing shaft A1. Since there is space in the radial direction as well, the housing rotates with the outer end KB11 on one end side of the housing K as a fulcrum. Therefore, the other end side end surface 11E1 of the adjustment portion 11 which is the reference plane for the axis alignment of the housing shaft adjustment unit 1 and the one end side outer end surface KB1 which is the reference plane for the axis alignment at the bottom KB of the housing K are in contact with each other. By being in contact with each other, the coaxial processing shaft A1 of the housing shaft adjusting unit 1 and the central shaft A2 of the housing K are not coaxial, but are aligned in parallel. At this time, it is assumed that the housing K is often moved to the machining axis, but this does not hinder the parallel alignment.

Here, since it is assumed that the outer end KB11 on one end side of the housing K and the end surface 11E1 on the other end side of the housing shaft adjusting portion 1 are in contact with each other, that is, sliding is assumed, the movement is smoothly performed. In this case, it is preferable that at least one end side outer end KB11 and the other end side end surface 11E1 are surface-treated or surface-treated so as to reduce the friction coefficient so that they can be easily slid. More preferably, the outer end surface KB1 and the outer peripheral surface K2 on one end side of the housing K and the inner peripheral surface 121 of the housing shaft adjusting portion 1 are also surface-treated or surface-treated. This is because the posture can be changed and the movement can be smoothly performed even when the two are in contact with each other by a cylindrical body (part).

On the other hand, the movements of the housing K, the magnet M, and the magnet shaft adjusting unit 2 will be described in conjunction with this. In the state of FIG. 2, the housing K abuts on the outer end surface KB1 on one end side of the housing K only at the outer end 11E1 on the other end side and the outer end KB11 on the one end side of the adjusting portion 11 of the housing shaft adjusting portion 1. However, the outer peripheral surface K2 of the cylindrical body, which is the other surface of the housing K, has a space between the outer peripheral surface K2 of the cylindrical body and the inner peripheral surface 121 of the cylindrical body 12 of the housing shaft adjusting portion 1. Further, the housing K is in contact with only one end side end MO11 of the magnet M on the inner peripheral surface K11 of the housing, but the other surface is between the inner peripheral surface K11 of the housing and the outer peripheral surface M2 of the magnet. Has a space in. Therefore, when both axis adjusting portions are relatively close to each other in the axial direction, the housing K on one end side of the magnet M is seen at the same time as the rotation of the housing K described above, which is the relative movement direction of the magnet M. Since there is a space in front of one end of the magnet and in the radial direction perpendicular to the coaxial processing axis A1, the magnet can be tilted along the central axis A2 of the housing or move in a direction perpendicular to the processing axis.

At the same time, when looking at the magnet M on the other end side of the housing K, there is space in the front of the other end side of the housing K, which is the relative movement direction of the housing K, and in the radial direction perpendicular to the coaxial processing axis A1. Therefore, the housing K can be tilted along the central axis A3 of the magnet M or can move in a direction perpendicular to the processing axis. The posture change of the housing K and the magnet M and the high degree of freedom of movement allow the magnet M to move the tapered portion relatively to one end side in the axial direction while the both axis adjusting portions are moving in the proximity direction. In addition, it seems to have the effect of inducing the central axis of the housing and the central axis of the magnet to gradually become coaxial.

Then, as shown in FIG. 3, when the end surface MO1 on one end side of the magnet M moves relative to the inner peripheral surface K11 of the cylinder having coaxiality with respect to the central axis, the relative pushing pressure is also large. The other end surface 11E1 of the housing shaft adjusting portion 1 and the outer end surface KB1 on the one end side of the housing K are brought into contact with each other, so that the coaxial processing shaft A1 of the housing shaft adjusting portion 1 and the central axis A2 of the housing K It seems that the parallel alignment has been completed, and the coaxial alignment between the central axis A2 of the housing and the central axis A3 of the magnet has also been completed. Which alignment starts first and which ends first depends on various factors such as the relative positional relationship of the initial housing and magnets with respect to the center of the machining axis, the inclination angle of the housing and magnet arrangement, and the taper angle. It seems that it will change depending on.

The resin used for the magnet M to be press-fitted is a thermosetting resin, and after being formed into a cylindrical bond magnet, a thermosetting treatment (cure treatment) is performed. As a result, it is possible to obtain more sufficient strength against the elastic deformation that is received when the vicinity of the one end surface MO1 of the magnet M is centered with respect to the inner peripheral surface of the housing. Further, at the time of press-fitting, the bond magnet was heated to a predetermined temperature. The housing was also heated to a predetermined temperature. When heated, more sufficient magnet deformability can be obtained. In that case, the press-fitting allowance can be increased, and the adhesion between the magnet and the housing can be enhanced. As the magnet powder used for the bond magnet, a mixed powder of NdFeB-based anisotropic magnet powder and SmFeN-based magnet powder was used. As a result, a bonded magnet having high magnetic characteristics can be obtained, which can contribute to miniaturization and high performance of the motor. The orientation pattern of the magnet powder was mainly in the radial direction. Of course, various known orientation patterns can be applied.

The effects of the above invention have been described on the premise that the processing shaft of the housing shaft adjusting portion and the processing shaft of the magnet shaft adjusting portion of this embodiment are coaxially positioned.
However, as is clear from the above description, even if there is an amount of misalignment in the direction perpendicular to the axis of the processing shaft of the housing shaft adjusting unit 1 and the magnet shaft adjusting unit 2, the magnet M is the housing K. Press-fitting is established as long as it can be inserted into the housing K and can be pressed in a relatively close direction while holding the housing K and the magnet M.
Therefore, when the minimum diameter D1min including the variation of the inner diameter D1 of the opening end face of the housing and the maximum diameter dmax including the variation of the outer diameter d of the bond magnet are set, the housing is acceptable in order to facilitate the axis adjustment. The permissible amount of axis deviation in the direction perpendicular to the axis of the processing axis of the axis adjusting unit 1 and the magnet axis adjusting unit 2 is, for example, δs1 when one is assumed to be a coaxial processing axis. Further, the maximum allowable increase in outer shape in the projected shape on a plane perpendicular to the coaxial processing axis of the housing or the like due to the central axis of the housing K or the magnet M being inclined from the processing axis is δs2. Further, the allowable axis deviation amount of the central axes of both in the direction perpendicular to the coaxial processing axis depending on the arrangement position of the magnet M and the housing K is defined as δs3. In that case, the maximum allowable axis deviation amount ΔS = δs1 + δs2 + δs3 with respect to the appropriately selected coaxial processing axis. In that case, Dmin> dmax + ΔS is established, and if the above-mentioned dimensions are managed in addition to the various dimensional relationships of the present invention, the time-consuming adjustment of the processing shafts of the housing shaft adjusting unit 1 and the magnet shaft adjusting unit 2 can be shortened. can do. It should be noted that each deviation amount δs can be set in the reduction direction by a known means. For example, in the case of δs2, it is possible by narrowing the space between the outer peripheral surface of the housing K and the inner peripheral surface of the housing holding portion 1.

Further, even when the processing shafts of the housing shaft adjusting portion 1 and the magnet shaft adjusting portion 2 are tilted, where is it necessary to feed the other end surface ME1 of the magnet M to the accommodating portion K12 (coaxiality required portion)? , The shape of the inner peripheral surface K1 of the housing (including various dimensions and dimensional accuracy), the outer diameter shape of the end surface 2E1 on one end side of the magnet shaft adjusting portion 1 (including various dimensions and dimensional accuracy), and elastic deformation of the bond magnet, etc. A certain amount of misalignment is allowed within the range of capability.

Further, regarding the magnet M, the plane of the other end surface ME1 is not one plane as in this embodiment, for example, a virtual plane perpendicular to the central axis A3 of the inner peripheral surface M1 of the cylindrical axis of the magnet M. It may have four independent planes separated by a uniform distance that matches. When these four independent plane portions come into contact with the end surface 2E1 on one end side of the magnet shaft adjusting portion 2, one end of the reference plane for axising perpendicular to the coaxial processing shaft A1 of the magnet shaft adjusting portion 2 is the same as in the embodiment. When the side end surface 2E1 and the other end surface ME1 of the magnet come into contact with each other, the coaxial processing axis A1 of the magnet shaft adjusting portion 2 and the central axis A3 of the magnet M are not coaxial, but are aligned in parallel. The rest is the same as in the embodiment. Therefore, such a case is also included in the present invention.

<< Modification example >>
4 and 5 show the housing L, the housing shaft adjusting portion 3, and the magnet shaft adjusting portion 4 by partially changing the housing, the housing shaft adjusting portion, and the magnet shaft adjusting portion with respect to the embodiment. It has the same configuration. First, the shape of the bottom KB of the housing K in the embodiment is a housing L having a bottom LB having three recesses LB2. Then, the concave outer end surface LB21 is provided with the portion corresponding to the one end side outer end surface KB1 in the embodiment as three planes perpendicular to the central axis A2 of the housing L. Further, a hole LB3 is provided in the center of the bottom KB.

On the other hand, the housing shaft adjusting portion 1 in the embodiment has the coaxial machining shaft A1 coaxial with the machining shaft of the magnet shaft adjusting portion 2, and is parallel to the machining shaft A1. Is formed as a housing shaft adjusting portion 3 provided with the above. The positional relationship of the prismatic member 31 on the plane perpendicular to the axial direction is formed according to the positional relationship of the three concave portions LB2 of the housing L. Therefore, the housing L and the housing shaft adjusting unit 3 need to be positioned in the circumferential direction. Further, the other end surface 3E1 of each prismatic member 31 is formed of a plane that coincides with a plane perpendicular to the processing axis A1. Further, the cross-sectional shape of the other end side end surface 3E1 of each prismatic member 31 of the housing shaft adjusting portion 3 is formed to be smaller than the cross-sectional shape of the concave outer end surface LB21 of the housing L.

On the other hand, the magnet shaft adjusting portion 2 in the embodiment has one end side which is a contact surface of the columnar portion 41 with the magnet M while having the coaxial machining shaft A1 coaxial with the machining shaft of the housing shaft adjusting portion 3. It has a columnar portion 42 that is coaxial with the coaxial processing shaft A1 projecting from the end surface 41E1 to one end side and has a reduced diameter from the columnar portion 41, and further projects from the end surface 42E2 on one end side of the columnar portion 42 to one end side. It is formed as a magnet shaft adjusting portion 4 which is coaxial with the coaxial processing shaft A1 and has a cylindrical portion 43 whose diameter is reduced from the cylindrical portion 42. The axial length of the columnar portion 42 is the same as the axial length of the magnet M.

The magnet M is inserted and positioned along the columnar portion 43 and the outer peripheral surface 422 of the columnar portion 42 from above one end side of the magnet shaft adjusting portion 4. If the magnet shaft adjusting portion has such a shape, the magnet can be easily placed on the magnet shaft adjusting portion and will not fall off.
Further, the outer diameter of the outer circumference of the cylindrical portion 42 of the magnet shaft adjusting portion 4 is formed to be smaller than the inner diameter of the magnet M. In the case of such a configuration, as in the embodiment, when the housing shaft adjusting portion 3 and the magnet shaft adjusting portion 4 are relatively close to each other in the axial direction from the state shown in FIG. The other end side end surface 3E1 of the three prismatic members 31 perpendicular to the coaxial processing axis A1 of the body axis adjusting portion 3 and the one end side outer end surface LB21 which is the reference plane for the axis of the recess LB2 in the bottom LB of the housing L are surfaces. By abutting each other, the coaxial processing shaft A1 of the housing shaft adjusting portion 3 and the central shaft A2 of the housing L are not coaxial, but are aligned in parallel.

At the same time, consider the case where the housing L, the magnet M, and the magnet shaft adjusting portion are close to each other in the axial direction from the state of FIG. When the housing L on one end side of the magnet M is viewed, the magnet M is restricted to the front one end side of the magnet and the radial direction perpendicular to the coaxial processing axis A1 which are the relative movement (axis) directions of the magnet M, unlike the embodiment. There is a space that has been created. In the case of FIG. 1 of the embodiment, the space perpendicular to the axial direction is wide, and the degree of freedom of movement of the magnet M is very high. Therefore, when the central axis A3 of the magnet is aligned with the central axis A2 of the housing after the cylindrical bond magnet M comes into contact with the tapered portion of the housing, one end side of the cylindrical magnet M undergoes a large deformation. In particular, when the thickness of the cylindrical bond magnet M is thin, the strength of the bond magnet M may not be sufficient if the degree of adjustment of the central axis A3 of the bond magnet M is too high. On the other hand, in this modification, the degree of freedom and distance of changing the posture of the cylindrical magnet M and moving in the direction perpendicular to the axis are appropriately limited, so that when the magnet M is centered along the tapered portion, Excessive stress is not applied to one end side of the bond magnet M, and the strength of the thin cylindrical bond magnet can be improved.

Further, the tip end portion of the prismatic member 31 in FIG. 5 may be a hemispherical portion 311 (not shown). Naturally, in this case, the virtual plane perpendicular to the coaxial processing shaft A1 of the housing shaft adjusting portion 3 and each hemispherical portion 311 come into contact with each other at a point. In this case, each hemispherical portion 311 and each of the three outer end surfaces LB21 on one end side, which are reference planes for axising the recess LB2 in the bottom LB of the housing L, simultaneously hit at the reference point while sharing the above virtual plane. By being in contact with each other, the coaxial processing shaft A1 of the housing shaft adjusting portion 3 and the central shaft A2 of the housing L are not coaxial, but are aligned in parallel. The rest is the same as in the embodiment.

As another modification, FIG. 6 shows a case where there is no clear bottom of the housing. The housing K of the embodiment is simply changed to a housing N having a cylindrical shape. In this case, one end side end surface NB1 of the housing N is the bottom portion of the housing N, and has one end side end surface NB1 of the housing N. In this modification, as in the embodiment, the housing K in the state of FIG. 2 is changed to the housing N of FIG. 6, and the housing shaft adjusting unit 1 and the magnet shaft adjusting unit 2 are moved in the axial direction from that state. When they are relatively close to each other, as shown in FIG. 7, they are the other end surface 11E1 of the plane perpendicular to the coaxial processing shaft A1 of the housing shaft adjusting portion 1 and the bottom portion of the housing N, as in the embodiment. When the end faces NB1 on one end side, which is the reference plane for shafting, come into contact with each other, the coaxial processing shaft A1 of the housing shaft adjusting portion 1 and the central axis A2 of the housing N are not coaxial, but are aligned in parallel. .. The rest is the same as in the embodiment. Therefore, such a modification is also included in the present invention.

K housing M magnet 1 housing shaft adjustment part 2 magnet shaft adjustment part

Claims (1)

A method for manufacturing a housing and an assembly of magnets in which a magnet having elastic deformability (hereinafter, simply referred to as a magnet in the claim) is press-fitted into a housing for a motor, and the housing has a bottomed cylindrical shape. The housing extends from the bottom thereof in the direction of the central axis, and has a housing portion for accommodating a magnet having a cylindrical inner peripheral surface having a coaxiality with the central axis, and at least the inner peripheral surface of the housing. Has a tapered portion that expands in the radial outer diameter side toward the other end side in the axial direction of the accommodating portion.
The outer end surface on one end side of the housing has at least three independent plane portions in a virtual plane perpendicular to the central axis of the inner peripheral surface of the cylinder.
The magnet has a cylindrical shape, and the other end surface of the magnet has at least three independent plane portions in a virtual plane perpendicular to the central axis of the inner peripheral surface of the cylinder.
A preparatory step for preparing the magnet having an outer diameter of the magnet smaller than the inner diameter of the inner end on the opening side of the housing and larger than the inner diameter of the inner peripheral surface of the cylinder having the same coaxiality.
At the time of contact with the housing, the virtual plane is shared by the outer end surface on one end side of the housing, and at least three independent plane portions are provided on the other end surface in contact with each independent plane portion. A housing shaft adjustment part composed of members extending at least vertically from the part to one end side in the axial direction,
At the time of contact with the magnet, the virtual plane is shared by the other end surface of the magnet, and at least three independent plane portions are provided on the one end side end surface that abuts on each independent plane portion, and the shaft is formed from each one end side end surface. A method for manufacturing an assembly of a magnet and a housing having elastic deformability, which comprises providing a magnet shaft adjusting portion composed of a member extending at least in the vertical direction on the other end side in the direction.

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