WO2012008150A1 - Structure de fixation et appareil d'entraînement - Google Patents

Structure de fixation et appareil d'entraînement Download PDF

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Publication number
WO2012008150A1
WO2012008150A1 PCT/JP2011/003992 JP2011003992W WO2012008150A1 WO 2012008150 A1 WO2012008150 A1 WO 2012008150A1 JP 2011003992 W JP2011003992 W JP 2011003992W WO 2012008150 A1 WO2012008150 A1 WO 2012008150A1
Authority
WO
WIPO (PCT)
Prior art keywords
bend
portions
circumferential wall
fixing structure
recessed portion
Prior art date
Application number
PCT/JP2011/003992
Other languages
English (en)
Inventor
Masahiko Nakamura
Machiko Okabayashi
Tomoyoshi Yokogawa
Original Assignee
Nidec Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nidec Corporation filed Critical Nidec Corporation
Publication of WO2012008150A1 publication Critical patent/WO2012008150A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor

Definitions

  • the present invention relates to a fixing structure for suitable use in a drive apparatus such as a motor.
  • bracket and the cover are commonly provided with flanges each including a plurality of fitting holes extending in the axial direction defined therein, and screws or the like are inserted into the fitting holes to securely fix the bracket and the cover to each other.
  • JP-A 9-205751 discloses a motor in which separate members are fixed to each other through swaging without use of screws.
  • a housing of this motor is made up of a deep-drawn metallic case, which has a bottom and is cylindrical, and a flange plate.
  • the flange plate is fixed to an opening portion of the case.
  • the case includes a plurality of swaging portions defined in the opening portion thereof. The swaging portions are bent at right angles to fix an outer circumferential portion of the flange plate, so that the flange plate is fixed to the case.
  • each swaging portion highly precisely at right angles to bring the swaging portion into close surface contact with the flange plate. It is, however, difficult to bend each swaging portion highly precisely at right angles. It often happens that a top of the swaging portion is bent so excessively that the swaging portion is brought into line contact with the flange plate. If the swaging portion is brought into line contact with the flange plate, the flange plate is shaved to produce shavings. These shavings may cause malfunction of the motor.
  • the present invention has been conceived to provide a fixing structure that ensures secure fixing and stable mass production.
  • a fixing structure which is used to fix, to a metallic receptacle including a cylindrical circumferential wall having an opening at one end thereof, a cylindrical fitting member including a fitting portion to be fitted into the opening.
  • the fixing structure includes a plurality of bend portions each of which is bent in a thickness direction of the circumferential wall, and at least one recessed portion.
  • Each of the bend portions is defined integrally with the circumferential wall, and is arranged to extend obliquely toward the opening at an angle with respect to a central line of the circumferential wall.
  • the at least one recessed portion is defined in a circumferential surface of the fitting portion for the bend portions.
  • the at least one recessed portion includes a plurality of support surfaces arranged to have inclinations corresponding to those of the bend portions.
  • the bend portions include a first bend portion and a second bend portion arranged to extend in mutually opposite directions with respect to a circumferential direction of the circumferential wall. Each of the first and second bend portions is arranged in contact with one of the support surfaces.
  • the first and second bend portions are defined in the circumferential wall.
  • the first and second bend portions are arranged to extend obliquely toward the opening and in mutually opposite directions with respect to the circumferential direction of the circumferential wall, and are each bent in the thickness direction of the circumferential wall.
  • the at least one recessed portion arranged for the first and second bend portions is provided with the plurality of support surfaces arranged to have the inclinations corresponding to those of the bend portions.
  • Each of the first and second bend portions is arranged in contact with one of the support surfaces. Accordingly, each of the bend portions is arranged to easily achieve surface contact with a corresponding one of the support surfaces. The fitting member is thus fixed to the receptacle securely, and a reduction in production of shavings is achieved.
  • each of the bend portions and the support surfaces may be inclined at a specified angle with respect to each of a direction parallel to the central line and the circumferential direction. In this case, even if there is a slight molding error or deviation in any of the bend portions and the support surfaces, the molding error or deviation can be absorbed, leading to excellent productivity.
  • a component force that contributes to fixing the fitting member in the circumferential direction, and a component force that acts on the fitting member in a direction parallel to the central line and away from the opening are simultaneously obtained. This contributes to preventing a shake, a displacement, or the like of the fitting member.
  • Fig. 1 is a schematic perspective view of a drive apparatus according to a preferred embodiment of the present invention.
  • Fig. 2 is a schematic cross-sectional view of the drive apparatus.
  • Fig. 3 is a schematic side view of a cut portion according to the preferred embodiment of the present invention.
  • Fig. 4A is a schematic plan view of a recessed portion according to the preferred embodiment of the present invention, and
  • Fig. 4B is a schematic side view of the recessed portion.
  • Fig. 5 is a schematic side view for explaining actions of a fixing structure according to the preferred embodiment of the present invention.
  • Fig. 6 is a schematic plan view of a drive apparatus according to an example modification of the preferred embodiment of the present invention.
  • Fig. 7 is a schematic plan view of a drive apparatus according to another example modification of the preferred embodiment of the present invention.
  • Figs. 1 and 2 each illustrate a motor 1 (i.e., a drive apparatus) to which a fixing structure according to a preferred embodiment of the present invention is applied.
  • An outer circumferential surface of the motor 1 is preferably substantially cylindrical.
  • the motor 1 includes a motor case 20 (i.e., a receptacle), a cover 30 (i.e., a fitting member), a motor body 40, and so on.
  • the motor case 20 is, for example, a cylindrical metallic receptacle including an opening 21 defined at an end thereof and shaped by press working.
  • the motor case 20 includes a cylindrical circumferential wall 22 and a bottom wall 23.
  • the bottom wall 23 is arranged to close an opposite end of the motor case 20.
  • the cover 30 is arranged to close the opening 21 of the motor case 20.
  • the cover 30 is made of a synthetic resin or a metal, for example.
  • a through hole 31 is defined in a center of the cover 30.
  • the through hole 31 is arranged to extend through the cover 30 along a central line A of the cover 30.
  • the cover 30 includes a fitting portion that has an outside diameter slightly smaller than the diameter of the opening 21 of the motor case 20.
  • the fitting portion is securely fitted to the opening 21 of the motor case 20, so that the opening 21 of the motor case 20 is closed by the cover 30.
  • the cover 30 itself constitutes the fitting portion.
  • An outside surface 32 of the cover 30 is preferably arranged to align with an edge of the circumferential wall 22 on a side where the opening 21 is defined, when the cover 30 has been fixed to the motor case 20.
  • the motor body 40 is arranged inside the motor case 20 closed by the cover 30.
  • the motor body 40 includes a shaft 41 and so on.
  • the shaft 41 is supported by a lower bearing 2 and an upper bearing 3 such that the shaft 41 is rotatable on the central line A of the cover 30 and the motor case 20.
  • the lower bearing 2 is attached to a central portion of the bottom wall 23 of the motor case 20.
  • the upper bearing 3 is attached to the through hole 31 of the cover 30.
  • One end of the shaft 41 is arranged to project out of the cover 30 through the through hole 31.
  • the motor body 40 includes a rotor (not shown), a stator (not shown), and so on.
  • the motor body 40 is arranged to drive and rotate the shaft 41 through currents supplied from an external source.
  • the motor 1 is a screw-less motor that does not involve use of a screw or the like for fixing.
  • the motor 1 is provided with fixing structures 50 where portions of the motor case 20 are bent to fix the cover 30 to the motor case 20.
  • the fixing structures 50 are two in number, and the two fixing structures 50 are arranged at two separate locations in an edge portion of the motor 1 on the side where the opening 21 is defined.
  • the two fixing structures 50 are arranged radially opposite each other.
  • Each of the two fixing structures 50 includes two bend portions 51 and one recessed portion 52.
  • the two bend portions 51 are defined in the motor case 20, and are bent to fix the cover 30 to the motor case 20.
  • the recessed portion 52 is defined in the cover 30.
  • Fig. 3 illustrates the bend portions 51 prior to bending.
  • Two cut portions 24 are defined in an end portion of the circumferential wall 22 on the side where the opening 21 is defined.
  • Each of the cut portions 24 is substantially in the shape of a trapezoid, and is defined by cutting a portion of the circumferential wall 22. Locations of the two cut portions 24 correspond to those of the two fixing structures 50.
  • each of the cut portions 24 includes a bottom edge portion 24a and a pair of side edge portions 24b.
  • the bottom edge portion 24a of each cut portion 24 is positioned at a level lower than that of an edge 22a of the circumferential wall 22.
  • the side edge portions 24b are arranged to extend obliquely so as to spread from the bottom edge portion 24a toward the edge 22a and to be in connection with ends of the bottom edge portion 24a and the edge 22a.
  • One of the bend portions 51 is defined in each of the side edge portions 24b of each cut portion 24 integrally with the circumferential wall 22. More specifically, in the present preferred embodiment, a first bend portion 51a and a second bend portion 51b, which are arranged to extend in mutually opposite directions with respect to a circumferential direction of the circumferential wall 22, are defined in each cut portion 24. The first bend portion 51a and the second bend portion 51b, each numbering one, are provided for each recessed portion 52.
  • Each of the bend portions 51 is substantially in the shape of a rectangular plate, and arranged to extend toward the opening 21 at an angle (about 45 degrees in the present preferred embodiment) with respect to the central line A of the circumferential wall 22.
  • Each of the bend portions 51 is arranged to extend substantially perpendicularly to a corresponding one of the side edge portions 24b.
  • each of the bend portions 51 is arranged inside the cut portion 24 in its entirety.
  • each bend portion 51 is arranged such that a top thereof does not project outward beyond the edge 22a of the circumferential wall 22. Therefore, it is possible to define all of the cut portions 24 and the bend portions 51 by a single instance of stamping the circumferential wall 22 through press working.
  • the present preferred embodiment is therefore excellent in terms of material costs and mass productivity.
  • Figs. 4A and 4B illustrate the recessed portion 52 of the cover 30.
  • Fig. 4A is a diagram illustrating the recessed portion 52 when viewed from above in a direction parallel to the central line A of the cover 30.
  • Fig. 4B is a diagram illustrating the recessed portion 52 when viewed from a radial outside in a direction perpendicular to the central axis A.
  • the recessed portions 52 are provided at two locations in a circumferential surface of the cover (i.e., the fitting portion) 30 where the bend portions 51 are defined.
  • each of the recessed portions 52 is defined in an edge of an end portion of the cover 30 on the side where the opening 21 is defined.
  • Each recessed portion 52 is substantially in the shape of a trapezoid, and is open both on a side closer to the central line A and on a radial outside.
  • Each recessed portion 52 includes a first support surface 53, a second support surface 54, a bottom surface 55, and an inner side surface 56.
  • the first and second support surfaces 53 and 54 are arranged to have inclinations corresponding to those of the first and second bend portions 51a and 51b, respectively.
  • the bottom surface 55 is arranged in connection with lower ends of the first and second support surfaces 53 and 54.
  • the inner side surface 56 is arranged in connection with radially inner ends of the bottom surface 55 and the first and second support surfaces 53 and 54.
  • each of the support surfaces 53 and 54 is inclined (at an angle of 45 degrees with respect to the central line A) from the bottom surface 55 of the recessed portion 52 toward the opening 21.
  • Radially outer edges 53a and 54a of the first and second support surfaces 53 and 54, respectively, are arranged to extend in directions substantially perpendicular to longitudinal directions of the first and second bend portions 51a and 51b, respectively, when viewed from the radial outside.
  • the support surfaces 53 and 54 are also arranged to extend obliquely from the inner side surface 56 of the recessed portion 52 toward the radial outside so as to expand in a radial manner away from the central line A.
  • the cut portion 24 is greater in size than the recessed portion 52.
  • the cut portion 24 is arranged relative to the recessed portion 52 such that an edge of the cut portion 24 is displaced outward from an edge of the recessed portion 52.
  • each of the side edge portions 24b of the cut portion 24 is displaced outward by a predetermined bend margin h from a corresponding portion of the edge of the recessed portion 52 (i.e., the radially outer edge of the corresponding support surface).
  • each of the bend portions 51 is bent in a thickness direction of the bend portion 51 (i.e., radially inward). Each bend portion 51 is thereby brought into surface contact with a corresponding one of the support surfaces 53 and 54 of the recessed portion 52, so that the cover 30 is fixed to the motor case 20.
  • each bend portion 51 is securely achieved at a position away from a base of the bend portion 51 even if, for example, the shape of the recessed portion 52 or that of the cut portion 24 deviates from a desired shape due to an error in a molding process. Therefore, the surface contact of each bend portion 51 with the corresponding one of the support surfaces 53 and 54 is securely achieved, so that the bend portion 51 is firmly fixed to the corresponding one of the support surfaces 53 and 54.
  • each of the first and second bend portions 51a and 51b which are arranged to extend obliquely and in mutually opposite directions with respect to the circumferential direction of the circumferential wall 22, is bent with an angle defined with respect to the central line A. Therefore, circumferential positioning of the cover 30 relative to the circumferential wall 22 is easily accomplished by roughly aligning each cut portion 24 with a corresponding one of the recessed portions 52 and bending each bend portion 51, because an oblique component force fr acts to gradually bring the cover 30 into a desired position relative to the circumferential wall 22.
  • each of the bend portions 51 and the support surfaces 53 and 54 is inclined at a specified angle with respect to each of the direction parallel to the central line A and the circumferential direction. This makes it possible to bring each of the bend portions 51 into surface contact with a corresponding one of the support surfaces 53 and 54 securely. Even if there is a slight molding error or deviation in any of the recessed portions 52 and the cut portions 24, the molding error or deviation is easily absorbed.
  • the present preferred embodiment is therefore excellent in terms of productivity as well.
  • the rotation of the shaft 41 may produce a force that acts to lift the cover 30 or displace the cover 30 in the circumferential direction, for example.
  • the component force fr which contributes to fixing the cover 30 in the circumferential direction
  • a component force fs which acts in a direction parallel to the central line A and away from the opening 21, are simultaneously obtained at a contact surface between each of the bend portions 51 and the corresponding one of the support surfaces 53 and 54. This contributes, for example, to preventing a shake or a displacement between the cover 30 and the motor case 20, and preventing the cover 30 from coming off the motor case 20, leading to an effective reduction in production of shavings.
  • each recessed portion 52 are arranged to extend obliquely from the inner side surface 56 radially outward to be increasingly more distant from each other. This enables each of the bend portions 51 to be brought into contact with the corresponding one of the support surfaces 53 and 54 without a need to bend each of the bend portions 51 at an angle of as great as 90 degrees. This makes it easier to bring each of the bend portions 51 into surface contact with the corresponding one of the support surfaces 53 and 54, and therefore contributes to more effectively preventing the production of shavings.
  • the number of fixing structures 50 is not limited to two, but may be one or more than two in other preferred embodiments of the present invention. Also note that, in the case where the number of fixing structures 50 is more than two, the fixing structures 50 may not necessarily be arranged radially opposite one another.
  • each fixing structure 50 may not necessarily be provided with both the first and second bend portions 51a and 51b. It is enough that the motor 1 should include at least one first bend portion 51a and at least one second bend portion 51b, and that at least one recessed portion 52 should be provided for the first and second bend portions 51a and 51b.
  • the motor 1 may include two recessed portions 52 arranged radially opposite each other, with one of the recessed portions 52 including only one first bend portion 51a and the other of the recessed portions 52 including only one second bend portion 51b.
  • the drive apparatus according to the present invention is not limited to the motor, but may be an actuator or the like.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

L'invention concerne une structure de fixation qui comprend une pluralité de parties courbes, chacune étant définie d'un seul tenant dans la paroi circonférentielle, conçues pour s'étendre de manière oblique vers l'ouverture, en suivant un angle par rapport à un axe central de la paroi circonférentielle, puis étant recourbées dans la direction de l'épaisseur de la paroi circonférentielle ; et au moins une partie en décrochement définie dans la surface circonférentielle de la partie d'adaptation des parties courbes. Ladite au moins une partie en décrochement comprend une pluralité de surfaces d'appui, conçues pour avoir des inclinaisons qui correspondent à celles des parties courbes. Les parties courbes comprennent une première partie courbe et une seconde partie courbe, conçues pour s'étendre dans des directions opposées l'une à l'autre par rapport à la direction circonférentielle de la paroi circonférentielle. Chacune des premières et secondes parties courbes est placée au contact de l'une des surfaces d'appui.
PCT/JP2011/003992 2010-07-14 2011-07-12 Structure de fixation et appareil d'entraînement WO2012008150A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-159360 2010-07-14
JP2010159360A JP5696386B2 (ja) 2010-07-14 2010-07-14 固定構造及び駆動装置

Publications (1)

Publication Number Publication Date
WO2012008150A1 true WO2012008150A1 (fr) 2012-01-19

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PCT/JP2011/003992 WO2012008150A1 (fr) 2010-07-14 2011-07-12 Structure de fixation et appareil d'entraînement

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JP (1) JP5696386B2 (fr)
WO (1) WO2012008150A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111200347A (zh) * 2020-03-07 2020-05-26 高峰 一种三相异步电动机生产制造装配机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3030150B1 (fr) * 2014-12-11 2018-03-16 Valeo Systemes Thermiques Actionneur a encombrement reduit, avec blocage integre du moteur par rapport au boitier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001157404A (ja) * 1999-11-24 2001-06-08 Asmo Co Ltd モータ
JP2009240068A (ja) * 2008-03-27 2009-10-15 Mabuchi Motor Co Ltd ケース蓋固定構成を有するモータ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001157404A (ja) * 1999-11-24 2001-06-08 Asmo Co Ltd モータ
JP2009240068A (ja) * 2008-03-27 2009-10-15 Mabuchi Motor Co Ltd ケース蓋固定構成を有するモータ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111200347A (zh) * 2020-03-07 2020-05-26 高峰 一种三相异步电动机生产制造装配机

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Publication number Publication date
JP5696386B2 (ja) 2015-04-08
JP2012023845A (ja) 2012-02-02

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