JP2004222342A - Motor and fuel supply pump equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor capable of completely fixing a rotor magnet on a rotor body without using an adhesive. <P>SOLUTION: This motor includes housings 8, 30 and the rotor 29 which can rotate with respect to the housings. The rotor 29 includes the rotor body 42 and the rotor magnet 44 attached onto the rotor body 42, and a stator 46 is disposed in face to face with the rotor magnet 44. A contact 52 is provided on one end side of the rotor body 42, a plastic deformation portion 56 is provided on the other end side of the rotor body 42, and the rotor magnet 44 and an active member 58 are disposed between the contact 52 and the plastic deformation portion 56. The elastic force of the active member 58 is converted into a pressure force pressing toward the contact by an inclination surface of the plastic deformation portion, thus attaching the rotor magnet 44 onto the rotor body 42 without using the adhesive. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor that rotates by a mutual magnetic action between a rotor magnet and a stator, and a fuel supply pump including the motor.
[0002]
[Prior art]
For example, a fuel supply pump is used to supply fuel to a fuel injection device (for example, see Patent Document 1). The fuel supply pump includes a pump housing, and a motor chamber and an impeller chamber are provided in the pump housing. A motor is provided in the motor chamber, an impeller is provided in the impeller chamber, and an output shaft of the motor is drivingly connected to the impeller. In such a fuel supply pump, when the impeller is rotated in a predetermined direction by the motor, fuel is sucked into the impeller chamber from the suction port by the action of the impeller, and then supplied to the fuel injection device from the discharge port through the motor chamber. Is done.
[0003]
In such a fuel supply pump motor, the fuel is fed through the motor chamber. Therefore, if an adhesive is used to fix the rotor magnet of the motor, the adhesive may be dissolved in the fuel.
[0004]
Further, in the motor for a hard disk as a recording disk, when an adhesive is used to fix the rotor magnet, there is a problem that the surface of the hard disk is contaminated by outgas released from the adhesive.
[0005]
For this reason, a mounting method for fixing the rotor magnet without using an adhesive has been proposed (for example, see Patent Document 2). In this known mounting mode, the rotor magnet is directly fixed, for example, by caulking means, or the rotor magnet is fixed, for example, using a leaf spring.
[0006]
[Patent Document 1]
JP-A-11-117889
[Patent Document 2]
JP-A-11-41845
[0007]
[Problems to be solved by the invention]
However, the conventional mounting method has the following problems. For example, when the rotor magnet is directly fixed by the caulking means, a large stress may be partially applied to the rotor magnet when caulking is performed. The rotor magnet is fragile and easily chipped. When a large stress acts on such a part, the rotor magnet may be partially or entirely chipped or broken.
[0008]
When a leaf spring is used, the leaf spring is mounted in a concave portion of the rotor main body or is mounted on the rotor main body using a fixing screw. In such a mounting mode, the elastic force of the leaf spring is applied to the rotor magnet. It does not act sufficiently, and it is difficult to securely fix and hold the rotor magnet using the elastic force of the leaf spring.
[0009]
An object of the present invention is to provide a motor capable of securely fixing a rotor magnet to a rotor main body without using an adhesive, and a fuel supply pump provided with the motor.
[0010]
[Means for Solving the Problems]
The motor according to claim 1 of the present invention includes a housing and a rotor that is rotatable relative to the housing, wherein the rotor is rotatably supported by the housing, and the rotor main body. Having a rotor magnet mounted on the housing, wherein the housing is provided with a stator facing the rotor magnet,
At one end of the rotor main body, there is provided a contact portion with which one end surface of the rotor magnet comes into contact.At the other end of the rotor main body, the rotor magnet is deformed radially inward by plastic deformation, and A plastic deformation portion extending inclining toward the other end toward the inside is provided, and the rotor magnet is disposed between the contact portion and the plastic deformation portion of the rotor main body, Between the rotor magnet and the plastic deformation portion, a substantially ring-shaped action member that elastically reduces and expands the diameter is interposed, and the action member acting on the inclined surface of the plastic deformation section is further provided. The rotor magnet is elastically held by the rotor main body by the expanding force.
[0011]
In the motor of the present invention, the contact portion is provided on one end side of the rotor body, and a plastic deformation portion is provided on the other end side, and this plastic deformation portion is inclined toward the other end side inward in the radial direction. Extending. The rotor magnet is disposed between the contact portion and the plastic deformation portion, and a substantially ring-shaped operating member is interposed between the plastic deformation portion and the rotor magnet in a state where the diameter thereof is reduced. Therefore, the expanding force of the action member acts on the inclined surface of the plastic deformation portion, and the other end of the rotor magnet is elastically pressed toward the contact portion via the inclined surface, thus, the action member has The rotor magnet can be securely and elastically held on the rotor body by using the expanding force. In addition, since there is a gap between the rotor magnet and the plastic deformation portion for interposing an action member, the plastic deformation portion does not directly act on the rotor magnet when performing plastic deformation, and the rotor during plastic deformation is deformed. Chipping and breakage of the magnet can be prevented.
[0012]
The motor according to claim 2 of the present invention includes a housing, and a rotor that is rotatable relative to the housing. The rotor includes a rotor body rotatably supported by the housing, A motor having a rotor magnet mounted on a rotor body, wherein the housing is provided with a stator facing the rotor magnet.
At one end of the rotor main body, there is provided a contact portion with which one end surface of the rotor magnet comes into contact, and at the other end of the rotor main body, it is deformed radially outward by plastic deformation, and A plastic deformation portion extending obliquely to the other end side toward the outside is provided, and the rotor magnet is disposed between the contact portion and the plastic deformation portion of the rotor main body, Between the rotor magnet and the plastic deformation portion, a substantially ring-shaped action member that elastically reduces and expands the diameter is interposed, and the action member acting on the inclined surface of the plastic deformation section is further provided. The rotor magnet is elastically held by the rotor body by the diameter reducing force.
[0013]
In the motor of the present invention, an abutment portion is provided on one end side of the rotor body, and a plastic deformation portion is provided on the other end side, and the plastic deformation portion is inclined toward the other end toward the outside in the radial direction. Extending. The rotor magnet is disposed between the abutting portion and the plastic deformation portion, and a substantially ring-shaped operating member is interposed between the plastic deformation portion and the rotor magnet in a state where the diameter thereof is increased. Accordingly, the diameter reducing force of the action member acts on the inclined surface of the plastic deformation portion, and the other end of the rotor magnet is elastically pressed toward the contact portion via the inclined surface, thus, the action member has The rotor magnet can be securely and elastically held on the rotor body by utilizing the diameter reducing force. Also in this case, when the plastic deformation is performed, the plastic deformation portion does not directly act on the rotor magnet, and the chipping and breakage of the rotor magnet during the plastic deformation can be prevented.
[0014]
Further, in the motor according to claim 3 of the present invention, the plastic deformation portion is disposed at substantially equal intervals in the circumferential direction at the other end of the rotor main body, and protrudes outward from the other end of the rotor main body. The rotor magnet is plastically deformed in a radial direction after the rotor magnet is mounted on the rotor body.
[0015]
In the motor of the present invention, the plastically deformed portion is provided so as to protrude outward at the other end of the rotor body, and is plastically deformed after the rotor magnet is mounted on the rotor body, so that after the plastically deformed portion is plastically deformed. By interposing an operating member between the plastically deformed portion and the rotor magnet, the rotor magnet can be elastically and reliably held on the rotor body as required. When the rotor magnet is mounted on the inner peripheral side of the rotor body, the plastically deformed portion is plastically deformed inward in the radial direction, and when the rotor magnet is mounted on the outer peripheral side of the rotor body, the plastically deformed portion is deformed in the radial direction. It is plastically deformed outward.
[0016]
The motor according to claim 4 of the present invention includes a housing, and a rotor that is rotatable relative to the housing. The rotor includes a rotor body rotatably supported by the housing, A motor having a rotor magnet mounted on a rotor body, wherein the housing is provided with a stator facing the rotor magnet.
At one end of the rotor main body, there is provided a contact portion with which one end surface of the rotor magnet comes into contact, and at the other end of the rotor main body, a plastic deformation portion deformed in a radial direction by plastic deformation is provided. The rotor magnet is provided between the contact portion of the rotor body and the plastic deformation portion, and is provided between the contact portion of the rotor body and the rotor magnet, or A ring-shaped elastic member that elastically deforms in the axial direction is further interposed between the plastic deformation portion of the rotor body and the rotor magnet, and the rotor magnet is attached to the rotor body by the elastic force of the elastic member. It is characterized by being held elastically.
[0017]
In the motor of the present invention, a contact portion is provided on one end side of the rotor body, and a plastic deformation portion is provided on the other end side, and the rotor magnet is provided between the contact portion and the plastic deformation portion. . A ring-shaped elastic member is interposed between the contact portion of the rotor main body and the rotor magnet (or between the plastically deformed portion of the rotor main body and the rotor magnet) in a compressed state. The rotor magnet is elastically pressed toward the plastically deformed portion (or abutting portion), and thus the rotor magnet can be securely and elastically held on the rotor body by utilizing the elastic restoring force of the elastic member. . Also in this case, by plastically deforming the elastic member in a compressed state, the plastically deformed portion does not directly act on the rotor magnet, so that chipping and breakage of the rotor magnet during plastic deformation can be prevented. As such an elastic member, for example, a dish-shaped spring, a coil spring, or the like is used.
[0018]
Further, in the motor according to claim 5 of the present invention, the plastic deformation portion is disposed at substantially equal intervals in the circumferential direction at the other end of the rotor main body, and has a substantially L-shaped slit at the other end. , And plastically deformed in the radial direction after the rotor magnet is mounted on the rotor body.
[0019]
In the motor of the present invention, since the plastic deformation portion is provided by forming a substantially L-shaped slit in the rotor body, such a plastic deformation portion can be easily placed radially inward (or radially outward). It can be plastically deformed.
[0020]
In the motor according to claim 6 of the present invention, the rotor magnet is provided with a concave portion, and the rotor body is provided with a protrusion by plastic deformation. A relative rotation between the magnet and the rotor body is prevented.
[0021]
In the motor of the present invention, the rotor magnet is provided with a concave portion, and the protrusion due to plastic deformation of the rotor main body is engaged with the concave portion, so that the relative rotation between the rotor magnet and the rotor main body can be reliably prevented. it can. In addition, since a part of the rotor body is plastically deformed into a projection, the projection can be engaged with the recess of the rotor magnet after the rotor magnet is mounted.
[0022]
Further, a fuel supply pump according to claim 7 of the present invention includes a pump housing having a suction port and a discharge port, a motor according to any one of claims 1 to 6 incorporated in a motor chamber of the pump housing, An impeller disposed in an impeller chamber of a pump housing, wherein an output shaft of the motor extends from the motor chamber to the impeller chamber and is attached to the impeller,
When the motor is driven to rotate in a predetermined direction, the fuel sucked from the suction port is discharged from the discharge port through the impeller chamber and the motor chamber by the action of the impeller.
[0023]
In the fuel supply pump of the present invention, since the motor according to any one of claims 1 to 6 is provided, the rotor magnet can be securely fixed to the rotor main body without using an adhesive, and the fuel is supplied through the motor chamber. No problem occurs even if the flow occurs.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a motor according to the present invention and a fuel supply pump including the same will be described with reference to the accompanying drawings. FIG. 1 is a sectional view showing a fuel supply pump provided with an embodiment of a motor according to the present invention, FIG. 2 is a perspective view showing a rotor body and a rotor magnet of the motor of FIG. 1, and FIG. FIG. 4 is a perspective view of the rotor main body of FIG. 2 as viewed from the bottom side, and FIG. 4 is a plan view showing an operation member of the motor of FIG.
[0025]
In FIG. 1, the illustrated fuel supply pump includes a pump housing 2. The pump housing 2 has a hollow cylindrical housing main body 4 and a left end mounted on one end (left end in FIG. 1) of the housing main body 4. The housing 6 includes a wall 6, a right end wall 8 attached to the other end (right end in FIG. 1) of the housing body 4, and an outer end wall 10 attached outside the right end wall 8. In this embodiment, the motor chamber 12 is defined by the housing body 4, the left end wall 6 and the right end wall 8, and the impeller chamber 14 is defined by the right end wall 8 and the outer end wall 10. The left end wall 6 is provided with a connection portion 16, and the connection portion 16 is provided with a discharge port 18. The right end wall 8 is provided with a plurality of (for example, four) communication holes 20 spaced apart in the circumferential direction. Further, a connection portion 22 is provided on the outer end wall 10, and the connection portion 22 is provided with a suction port 24.
[0026]
The impeller chamber 14 is provided with an impeller 26 for sucking and feeding fuel. The impeller 26 has a number of blades (not shown) having a predetermined shape, and fuel is sucked in by the action of the blades. The motor chamber 12 is provided with a motor 28 for driving the impeller 26 to rotate in a predetermined direction. A support sleeve wall 30 is provided integrally with the right end wall 8, and the support sleeve wall 30 and the right end wall 8 function as a housing of the motor 28. A rotating shaft 36 (which constitutes an output shaft) is rotatably supported on the support sleeve wall 30 via a pair of bearings 32 and 34. One end of the rotating shaft 36 extends from the motor chamber 12 to the impeller chamber 14 through the right end wall 8, and the end is fixed to the impeller 26. The configuration of the motor 28 will be described later in detail.
[0027]
With this configuration, when the rotation shaft 36 of the motor 28 is driven to rotate in a predetermined direction, the impeller 26 is rotated integrally with the rotation shaft 36. Thus, the fuel such as gasoline is drawn into the impeller chamber 14 from the suction port 24 of the outer end wall 10 as shown by the arrow 38 by the action of the impeller 26. The fuel thus sucked is pressurized while flowing through the impeller chamber 14, and the pressurized fuel flows into the motor chamber 12 through the communication hole 20, and is injected from the discharge port 18 of the left end wall 6 in the direction indicated by the arrow 40, for example, by fuel injection. It is fed to a device (not shown).
[0028]
Next, the motor 28 will be described with reference to FIGS. 2 to 4 together with FIG. 1. The illustrated motor 28 includes a rotor 29 that is rotatable with respect to a motor housing. 42, and an annular rotor magnet 44 mounted on the rotor body 42. A stator 46 is disposed facing the rotor magnet 44, and the other end of the rotating shaft 36 is attached to the rotor body 42. I have. A mounting member 50 is fixed to the end wall 48 of the rotor body 42 by, for example, caulking, and the other end of the rotating shaft 36 is fixed to the mounting member 50 by, for example, press-fitting. Such a mounting member 50 is formed of a metal material, and the rotor body 42 is formed of a magnetic material (for example, SECC, SUS430).
[0029]
A contact portion 52 is provided annularly on one end side of the rotor main body 42, in this embodiment, on the outer peripheral portion of the end wall 48. Further, a plurality of through holes 53 are provided in the end wall 48 at intervals in the circumferential direction, and the fuel flowing into the rotor body 42 flows toward the discharge port 18 through the through holes 53. At the other end of the rotor body 42, in this embodiment, at the open end of the peripheral side wall 54, a plurality (three in this embodiment) of plastic deformation pieces 56 (plastic deformation portions) are arranged at substantially equal intervals in the circumferential direction. Are integrally provided. These plastically deformed pieces 56 are plastically deformed inward in the radial direction by caulking as described later, and are linearly formed radially inward from the open end of the peripheral side wall 54 toward the other end (open end side). And the inner surface of each plastic deformation piece 56 defines an inclined surface.
[0030]
The rotor magnet 44 is disposed between the contact portion 52 and the plurality of plastically deformed pieces 56 on the inner peripheral surface side of the peripheral side wall 54 of the rotor main body 42. A substantially ring-shaped action member 58 is interposed between the plurality of plastic deformation pieces 56. The rotor magnet 44 can be made of ferrite or rare earth, and is formed of plastic, rubber, neodybond, neody sintered, samarium / cobalt sintered, or the like. The surface of the rotor magnet 44 may be subjected to coating and plating treatments, and by performing electrolytic treatment, electroless nickel plating treatment, and the like, wear resistance and corrosion resistance can be enhanced. As such a rotor magnet 44, a segment-shaped rotor magnet may be used.
[0031]
The operating member 58 is formed of a C-shaped member with a part cut out, is formed of spring steel or the like, is elastically deformed in the radial direction, and is freely reduced in diameter and expandable in the radial direction. The plurality of plastically deformed pieces 56 are mounted on the inclined surfaces in such a reduced diameter.
[0032]
The stator 46 has a stator core 45 formed by stacking core plates, and a drive coil 47 wound around the stator core 45 as required. , For example by press fitting. The stator 46 is disposed radially inward of the rotor magnet 44, and is magnetized by supplying a drive current to a drive coil 47, and the rotor 28 (and the rotor 28) is magnetized by the mutual magnetic action of the stator 46 and the rotor magnet 44. The connected impeller 26) is rotated in a predetermined direction.
[0033]
In this embodiment, a pair of recesses 62 (see FIG. 2) are provided at one end of the rotor magnet 44. A plastically deformed portion 64 that is plastically deformed inward in the radial direction and functions as a protrusion is provided at a predetermined portion of the peripheral side wall 54 of the rotor main body 42 corresponding to the pair of recesses 62. The plastic deformation portion 64 is formed by forming a U-shaped notch in the peripheral side wall 54, and is plastically deformed in the radial direction with its base as a center.
[0034]
In the motor 28, the rotor magnet 44 is mounted, for example, as follows. As shown by the arrow in FIG. 2, the rotor magnet 44 is inserted from the open end of the rotor main body 42 and is brought into contact with the contact portion 52. In this state, for example, caulking is applied to the base of each plastic deformation piece 56. Process and bend radially inward. Then, a working member 58 in a reduced diameter state is interposed between the rotor magnet 44 and the bent plastic deformation piece 56. The action member 58 may be attached to the rotor main body 42 in a reduced diameter state and then released from the reduced diameter state to act on the inclined surface of the plastic deformation piece 56. The expanding force of the action member 58 acts on the inclined surface of the plastic deformation piece 56, and the expanding surface converts the expanding force into a pressing force for pressing the rotor magnet 44 toward the contact portion 52 of the rotor body 42. Thus, the rotor magnet 44 can be elastically and reliably pressed and held by utilizing the diameter expanding force of the action member 58. Thereafter, the base of the plastic deformation portion 64 of the rotor main body 42 is subjected to, for example, caulking to be plastically deformed inward in the radial direction and engaged with the concave portion 62 of the rotor magnet 44. When engaged, the relative rotation between the rotor body 42 and the rotor magnet 44 is reliably prevented, and thus the rotor magnet 44 can be securely attached to the rotor body 42 without using an adhesive. it can.
[0035]
Such a motor 28 has the following features. In a conventional motor, an adhesive is used to fix the rotor magnet. Therefore, when fuel flows through the motor chamber, the adhesive is deteriorated by the fuel and the adhesive force is reduced. There is a possibility that it will come off from. On the other hand, in the above-described motor 28, the adhesive is not used for fixing the rotor magnet 44, and the expanding force of the action member 58 is used. However, the rotor magnet 44 can be reliably fixed and held for a long time.
[0036]
In the above-described embodiment, three plastically deformable pieces 56 are provided at intervals in the circumferential direction of the rotor main body 42. However, four or more plastically deformable pieces 56 may be provided, or may be provided on the entire circumference. Is also good.
[0037]
Next, another embodiment of the fuel supply pump will be described with reference to FIG. FIG. 5 is a sectional view showing a fuel supply pump provided with another embodiment of the motor according to the present invention. In the embodiment shown in FIGS. 1 to 4, the present invention is applied to an outer rotor type motor in which a rotor magnet is disposed radially outside the stator. However, in the other embodiment shown in FIG. The present invention is applied to an inner rotor type motor in which a rotor magnet is disposed inside in the direction. In the following embodiments, substantially the same components as those in the above-described embodiments are denoted by the same reference numerals, and description thereof will be omitted.
[0038]
In FIG. 5, the illustrated fuel supply pump includes a pump housing 2, a motor 28A is disposed in a motor chamber 12 of the pump housing 2, an impeller 26 is disposed in the impeller chamber 14, and a rotating shaft of the motor 28A. 36 is fixed to the impeller 26. In this embodiment, the motor 28A includes a cup-shaped rotor body 42A, an annular rotor magnet 44A, and a stator 46A. The rotor magnet 44A is mounted on the outer peripheral surface of a peripheral side wall 54A of the rotor body 42A, and the stator 46A is 4 is attached to the inner peripheral surface. More specifically, at one end of the rotor main body 42A, in this embodiment, an outer peripheral portion of the end wall 48A is provided with an annular contact portion 52A protruding outward in the radial direction, and at the other end of the rotor main body 42A. In this embodiment, a plurality of plastically deformable pieces 56A (constituting a plastically deformable portion) are integrally formed on the open end of the peripheral side wall 54A at substantially equal intervals in the circumferential direction as described above. Is provided. These plastically deformed pieces 56A are plastically deformed radially outward by caulking as described later, and are linearly formed on the other end side (open end side) from the open end of the peripheral side wall 54A outward in the radial direction. And the outer surface of each plastic deformation piece 56A defines an inclined surface.
[0039]
The rotor magnet 44A is disposed between the abutting portion 52A of the rotor main body 42A and the plurality of plastically deformable pieces 56A so as to be fitted on the peripheral side wall 54A of the rotor main body 42A. Between the magnet 44A and the plurality of plastically deformable pieces 56A, a working member 58A whose diameter can be reduced and expanded is interposed, and the working member 58A is formed of a C-shaped member as described above. . Further, the stator 46A is disposed radially outward of the rotor magnet 44A, and the stator core 45A is attached to the inner peripheral surface of the housing body 4. The other configuration of this embodiment is substantially the same as the embodiment shown in FIGS.
[0040]
The mounting of the rotor magnet 44A in the motor 28A will be outlined as follows. The rotor magnet 44A is fitted to the peripheral side wall 54A from the open end of the rotor main body 42A and is brought into contact with the contact portion 52A, and each plastic deformation piece 56A is bent outward in the radial direction. Then, a working member 58A in an expanded state is interposed between the rotor magnet 44A and the bent plastic deformation piece 56A. The working member 58A is mounted so as to act on the inclined surface of the plastically deformable piece 56A by fitting the peripheral side wall 54A of the rotor body 42A in a state where the diameter is expanded and then releasing the expanded state. As a result, the diameter reducing force of the action member 58A acts on the rotor magnet 44A via the inclined surface of the plastic deformation piece 56A, and this diameter reducing force presses the rotor magnet 44A toward the contact portion 52A of the rotor body 42A. With this configuration, the rotor magnet 44A can be elastically pressed and held by using the diameter reducing force of the action member 58A as described above.
[0041]
Also in this case, similarly to the above-described embodiment, a plastically deformed portion (not shown) is provided in the rotor main body 42A, and a concave portion (not shown) is provided in the rotor magnet 44A, and the plastically deformed portion is formed in the radial direction. It may be plastically deformed outward to engage with the concave portion. With such a configuration, the relative rotation between the rotor magnet 44A and the rotor main body 42A can be reliably prevented.
[0042]
The manner of mounting the magnet 44 (44A) is not limited to the motor for the fuel supply pump, but is widely applied to other types of motors such as a spindle motor for a hard disk, a motor for a CD-ROM, and a motor for a DVD-ROM. It can be applied, for example, when applied to a spindle motor for a hard disk, it can solve problems such as outgas due to an adhesive, and when applied to a motor for a CD-ROM, etc., the adhesive can be used in a high-temperature, high-humidity environment. Problems such as a decrease in strength can be solved.
[0043]
Next, a further embodiment of the motor will be described with reference to FIGS. FIG. 6 is a sectional view showing still another embodiment of the motor, and FIG. 7 is a perspective view of the rotor body of the motor of FIG. 6 as viewed from below.
[0044]
6 and 7, the motor 102 includes a motor housing 104 attached to a housing (not shown) of an electric device or an electronic device, and a rotor 106 rotatably supported by the motor housing 104. . The motor housing 104 has a plate-shaped housing main body 108 and a support sleeve member 110 attached to the housing main body 108. One end of the support sleeve member 110 is fixed to the housing main body 108 by, for example, caulking. I have. The support sleeve member 110 may be provided integrally with the housing body 108.
[0045]
The rotor 106 has a cup-shaped rotor body 112, and a rotation shaft 116 is fixed to an end wall 114 of the rotor body 112, and the rotation shaft 116 is rotatably supported by the motor housing 104 via bearing means 118. I have. In this embodiment, the bearing means 118 includes a sleeve-shaped bearing 120 and a plate-shaped bearing 122, and the sleeve-shaped bearing 120 is mounted on the inner peripheral surface of the support sleeve member 110 and supports a radial load acting on the rotating shaft 116. The plate-shaped bearing 122 is disposed inside a closing member 124 attached to one end of the support sleeve member 120, and supports a thrust load acting on the rotating shaft 116. As the bearing means 118, for example, a combination of a pair of ball bearings or the like may be used instead of the combination of the sleeve-shaped bearing 120 and the plate-shaped bearing 122.
[0046]
An annular rotor magnet 126 is mounted on the inner peripheral surface of the peripheral side wall 126 of the rotor main body 112, and a stator 127 is provided to face the rotor magnet 126. A contact portion 128 is annularly provided on one end side of the rotor main body 112, that is, on the outer peripheral portion of the end wall 114 in this embodiment. Further, at the other end of the rotor body 112, in this embodiment, at the open end of the peripheral side wall 130, a plurality of (two in this embodiment) plastically deformed pieces 132 (in this embodiment) are disposed at substantially equal intervals in the circumferential direction. (Constituting a deformed portion) are integrally provided. In this embodiment, the plastically deformable piece 132 is formed by providing a substantially L-shaped slit at the other end of the peripheral side wall 130 of the rotor main body 112 (see FIG. 7), and radially inward as described later. It is plastically deformed by caulking, and projects radially inward from the open end of the peripheral side wall 130 (see FIG. 6).
[0047]
The rotor magnet 126 is disposed between the contact portion 128 and the plurality of plastic deformation pieces 132 on the inner peripheral surface side of the peripheral side wall 130 of the rotor main body 112. A ring-shaped elastic member 134 is interposed between the plurality of plastic deformation pieces 132. The elastic member 134 is formed of a disc spring in this embodiment, but may be formed of a coil spring or the like. The elastic member 134 is elastically deformable in the axial direction (vertical direction in FIG. 6) and can expand and contract. The stator 127 includes a stator core 136 and a drive coil 138 wound therearound. The stator core 136 is fixed to the outer peripheral surface of the support sleeve member 110.
[0048]
In the motor 102, the rotor magnet 126 is mounted, for example, as follows. The elastic member 134 and the rotor magnet 126 are inserted in this order from the open end of the rotor main body 112, and the elastic member 134 is pressed against the rotor magnet 126 to abut on the contact portion 128 of the rotor main body 112 to be compressed. Hold. Thereafter, each plastically deformed piece 132 is caulked (or bent) in the compressed state and bent radially inward, and then the compressed state of the elastic member 134 is released. In this manner, the rotor magnet 126 is pressed toward the plastically deformable piece 132 of the rotor main body 112 by the elastic restoring force of the elastic member 134, and the rotor magnet 126 is elastically and reliably relied on by utilizing the elastic force of the elastic member 134. The rotor magnet 126 can be pressed and held, and even with such a configuration, the rotor magnet 126 can be mounted on the rotor main body 112 without using an adhesive.
[0049]
Also in this embodiment, three or more plastically deformable pieces 132 may be provided at intervals in the circumferential direction of the rotor main body 112, or may be provided on the entire circumference. Also in this case, similarly to the above, a plastically deformed portion (not shown) is provided in the rotor main body 112, and a concave portion (not shown) is provided in the rotor magnet 126 so that the plastically deformed portion is radially inward. May be plastically deformed so as to engage with the concave portion. As described above, instead of separately providing the plastic deformation piece 132 for restricting the movement of the rotor magnet 126 in the axial direction and the plastic deformation portion for restricting the movement of the rotor magnet 126 in the circumferential direction, as follows. The plastic deformation piece 132 may be configured to have both functions. That is, a recess may be provided at the lower end of the rotor magnet 126 (the plastic deformation piece 132 side of the rotor main body 112), and the plastic deformation piece 132 may be plastically deformed inward in the radial direction to engage with the recess. With this configuration, the relative rotation between the rotor magnet 126 and the rotor main body 112 can be reliably prevented, and the rotor magnet 126 can be elastically and reliably pressed and held.
[0050]
The embodiments of the motor according to the present invention and the fuel supply pump including the same have been described above. However, the present invention is not limited to these embodiments, and various modifications and corrections can be made without departing from the scope of the present invention. Is possible.
[0051]
For example, in the embodiment shown in FIGS. 6 and 7, the elastic member 134 is interposed between the contact portion 134 of the rotor body 112 and the rotor magnet 126. 134 may be interposed between the rotor magnet 126 and the plastic deformation piece 132.
[0052]
Further, for example, in the embodiment shown in FIGS. 6 and 7, the present invention is applied to the outer rotor type motor in which the rotor magnet 126 is disposed radially outside the stator 127. The mode can also be applied to an inner rotor type motor in which the rotor magnet 126 is disposed inside the stator 127 in the radial direction.
[0053]
【The invention's effect】
According to the motor of the first and second aspects of the present invention, the rotor magnet and the operating member are disposed between the contact portion at one end of the rotor body and the plastic deformation portion at the other end, and the operating member is plastically deformed. Acting on the inclined surface of the portion, the elastic force of the operating member is converted into a pressing force for elastically pressing the rotor magnet toward the contact portion by the action of the inclined surface of the plastic deformation portion, and thus this operating member By using the elastic force of (1), the rotor magnet can be securely and elastically held on the rotor body.
[0054]
According to the motor of the third aspect of the present invention, the plastic deformation portion is provided so as to protrude outward at the other end of the rotor main body, and is plastically deformed after the rotor magnet is mounted on the rotor main body. By interposing an operating member between the plastically deformed portion and the rotor magnet after plastically deforming the deformed portion, the rotor magnet can be elastically and reliably held on the rotor body as required.
[0055]
According to the motor of claim 4 of the present invention, the rotor magnet is disposed between the contact portion on one end of the rotor body and the plastic deformation portion on the other end, and the contact portion or the plastic deformation portion is provided. Since the elastic member is interposed in a compressed state between the elastic member and the rotor magnet, the elastic member presses the rotor magnet elastically toward the plastic deformation portion or the contact portion, and thus the elasticity of the elastic member is reduced. The rotor magnet can be elastically and securely held on the rotor body by using the force.
[0056]
According to the motor of the fifth aspect of the present invention, since the plastic deformation portion is provided by forming a substantially L-shaped slit in the rotor main body, the plastic deformation portion can be easily plastically deformed in the radial direction. can do.
[0057]
According to the motor of the sixth aspect of the present invention, the rotor magnet is provided with the concave portion, and the protrusion due to the plastic deformation of the rotor body is engaged with the concave portion, so that the relative rotation between the rotor magnet and the rotor body is achieved. Can be reliably prevented.
[0058]
According to the fuel supply pump of claim 7 of the present invention, since the motor of any one of claims 1 to 6 is provided, the rotor magnet can be securely fixed to the rotor body without using an adhesive. Therefore, there is no problem even if the fuel flows through the motor chamber.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a fuel supply pump provided with an embodiment of a motor according to the present invention.
FIG. 2 is a perspective view showing a rotor main body and a rotor magnet of the motor of FIG. 1;
FIG. 3 is a perspective view of the rotor main body of FIG. 2 viewed from a bottom side.
FIG. 4 is a plan view showing an operation member of the motor of FIG. 1;
FIG. 5 is a sectional view showing a fuel supply pump provided with another embodiment of the motor according to the present invention.
FIG. 6 is a sectional view showing still another embodiment of the motor.
FIG. 7 is a perspective view of the rotor body of the motor of FIG. 6 as viewed from below.
[Explanation of symbols]
2 Pump housing
12 Motor room
14 Impeller room
18 Discharge port
24 Inlet
26 Impeller
28, 28A, 102 motor
29, 29A, 106 rotor
36,116 Rotation axis
42, 42A, 112 Rotor body
44,44A, 126 Rotor magnet
46, 46A, 127 Stator
52, 52A, 128 Contact part
56,56A, 132 Plastic deformation piece
58, 58A Working member
62 recess
64 Plastic deformation part (projection)
104 Motor housing
134 elastic member

Claims (7)

A housing, and a rotor rotatable relative to the housing, the rotor including a rotor body rotatably supported by the housing, and a rotor magnet mounted on the rotor body. A motor in which a stator is mounted on the housing so as to face the rotor magnet;
At one end of the rotor main body, there is provided a contact portion with which one end surface of the rotor magnet comes into contact.At the other end of the rotor main body, the rotor magnet is deformed radially inward by plastic deformation, and A plastic deformation portion extending inclining toward the other end toward the inside is provided, and the rotor magnet is disposed between the contact portion and the plastic deformation portion of the rotor main body, Between the rotor magnet and the plastic deformation portion, a substantially ring-shaped action member that elastically reduces and expands the diameter is interposed, and the action member acting on the inclined surface of the plastic deformation section is further provided. A motor, wherein the rotor magnet is elastically held by the rotor main body by an expanding force. A housing, and a rotor rotatable relative to the housing, the rotor including a rotor body rotatably supported by the housing, and a rotor magnet mounted on the rotor body. A motor in which a stator is mounted on the housing so as to face the rotor magnet;
At one end of the rotor main body, there is provided a contact portion with which one end surface of the rotor magnet comes into contact, and at the other end of the rotor main body, it is deformed radially outward by plastic deformation, and A plastic deformation portion extending obliquely to the other end side toward the outside is provided, and the rotor magnet is disposed between the contact portion and the plastic deformation portion of the rotor main body, Between the rotor magnet and the plastic deformation portion, a substantially ring-shaped action member that elastically reduces and expands the diameter is interposed, and the action member acting on the inclined surface of the plastic deformation section is further provided. A motor, wherein the rotor magnet is elastically held by the rotor body by a diameter reducing force. The plastic deformation portion is disposed at substantially equal intervals in the circumferential direction at the other end of the rotor main body, protrudes outward from the other end of the rotor main body, and the rotor magnet is mounted on the rotor main body. 3. The motor according to claim 1, wherein the motor is subsequently plastically deformed in the radial direction. A housing, and a rotor rotatable relative to the housing, the rotor including a rotor body rotatably supported by the housing, and a rotor magnet mounted on the rotor body. A motor in which a stator is mounted on the housing so as to face the rotor magnet;
At one end of the rotor main body, there is provided a contact portion with which one end surface of the rotor magnet comes into contact, and at the other end of the rotor main body, a plastic deformation portion deformed in a radial direction by plastic deformation is provided. The rotor magnet is provided between the contact portion of the rotor body and the plastic deformation portion, and is provided between the contact portion of the rotor body and the rotor magnet, or A ring-shaped elastic member that elastically deforms in the axial direction is further interposed between the plastic deformation portion of the rotor body and the rotor magnet, and the rotor magnet is attached to the rotor body by the elastic force of the elastic member. A motor that is elastically held. The plastically deformed portion is disposed at substantially the same interval in the circumferential direction at the other end of the rotor body, and is formed by forming a substantially L-shaped slit at the other end. The motor according to claim 4, wherein the magnet is plastically deformed in the radial direction after being mounted on the rotor body. The rotor magnet is provided with a recess, and the rotor body is provided with a protrusion by plastic deformation, and the engagement between the recess and the protrusion prevents relative rotation of the rotor magnet and the rotor body. The motor according to claim 1, wherein: A pump housing having a suction port and a discharge port, a motor according to any one of claims 1 to 6 incorporated in a motor chamber of the pump housing, and an impeller disposed in an impeller chamber of the pump housing. The output shaft of the motor extends from the motor chamber to the impeller chamber and is fixed to the impeller,
When the motor is driven to rotate in a predetermined direction, the fuel sucked in from the suction port is discharged from the discharge port through the impeller chamber and the motor chamber by the action of the impeller.

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