JP2019039505A

JP2019039505A - Fastening structure

Info

Publication number: JP2019039505A
Application number: JP2017162356A
Authority: JP
Inventors: 和年下薗; Kazutoshi Shimozono
Original assignee: JATCO Ltd
Current assignee: JATCO Ltd
Priority date: 2017-08-25
Filing date: 2017-08-25
Publication date: 2019-03-14

Abstract

To hold a motor case and a cover in a state of reducing vibration in motor operation.SOLUTION: A fastening structure is configured to fasten a cover 2 to a motor case 1 with a bolt 3, where the bolt penetrates in a thickness direction of the cover 2, and comprises: an SUS mesh structure 4a which surrounds an outer periphery of a shaft part 3a of the bolt 3 penetrating the cover 2, to which a head part 3b of the bolt 3 is pressure-welded in fastening the cover 2 to the motor case 1, and which is configured to absorb pressure of the bolt 3 in a penetration direction X from the head part 3b; and an elastic plate 5 surrounding an outer periphery of the shaft part 3a of the bolt 3 on an outer peripheral side of the SUS mesh structure 4a, and having rigidity lower than the SUS mesh structure 4a.SELECTED DRAWING: Figure 1

Description

本発明は、締結構造に関する。 The present invention relates to a fastening structure.

ハイブリッド自動車等において、車両を駆動するモータはモータケースに収容され、カバーによって封止される。モータケースはエンジンとトランスミッションの間に配置され、トランスミッションに固定される。モータケースとカバーは、ボルトにより締結されるが、モータ作動時に、ボルト締結部分にトルク反力が作用して振動が発生する。そこで、ボルト締結部分にモータトルク反力を吸収する弾性部材を設けることで、振動の低減を図っていた（例えば、特許文献１参照）。 In a hybrid vehicle or the like, a motor for driving the vehicle is housed in a motor case and sealed with a cover. The motor case is disposed between the engine and the transmission and is fixed to the transmission. The motor case and the cover are fastened by bolts, but when the motor is operated, a torque reaction force acts on the bolt fastening portion to generate vibration. Then, the reduction of vibration was aimed at by providing the elastic member which absorbs a motor torque reaction force in a bolt fastening part (for example, refer to patent documents 1).

実開平５−４５２８５号公報Japanese Utility Model Publication No. 5-45285

モータケースとカバーの締結時に、剛性の高い弾性部材を用いると、モータトルク反力による振動を吸収できなくなるおそれがある。一方、モータケースとカバーの締結時に、剛性の低い弾性部材を用いると、締結時にかかるボルトの貫通方向の圧力に対する反力が十分で無く、締結不良が発生するおそれがある。 If an elastic member having high rigidity is used when the motor case and the cover are fastened, vibration due to the motor torque reaction force may not be absorbed. On the other hand, if an elastic member having low rigidity is used when the motor case and the cover are fastened, the reaction force against the pressure in the penetrating direction of the bolt applied at the time of fastening may not be sufficient, and fastening failure may occur.

モータケースとカバーの締結構造において、モータ作動時にモータトルク反力を吸収して振動吸収を行うと同時に、ボルト締結時のボルトの貫通方向の反力を利用してモータケースとカバーを保持させることが求められる。 In the motor case and cover fastening structure, the motor torque reaction force is absorbed during motor operation to absorb vibrations, and at the same time, the motor case and cover are held using the reaction force in the bolt penetration direction during bolt fastening. Is required.

本発明の締結構造は、
第一部材を、当該第一部材の厚み方向に貫通するボルトにより第二部材に締結するものであって、
前記第一部材を貫通する前記ボルトの軸部の外周を取り囲み、前記第一部材を前記第二部材に締結する際に前記ボルトの頭部が圧接し、当該頭部から受ける前記ボルトの貫通方向の圧力を吸収する第１弾性部材と、
前記第１弾性部材の外周側で、前記ボルトの軸部の外周を取り囲み、前記第１弾性部材よりも低い剛性を有する第２弾性部材と、を備える。 The fastening structure of the present invention is
The first member is fastened to the second member with a bolt penetrating in the thickness direction of the first member,
Surrounding the outer periphery of the shaft portion of the bolt that penetrates the first member, and when the first member is fastened to the second member, the head portion of the bolt is in pressure contact, and the bolt penetration direction received from the head portion A first elastic member that absorbs the pressure of
A second elastic member surrounding the outer periphery of the shaft portion of the bolt on the outer peripheral side of the first elastic member and having lower rigidity than the first elastic member.

本発明によれば、剛性の異なる２つの弾性部材をボルト締結部分に設けることによって、モータ作動時にモータトルク反力を吸収して振動を低減すると同時に、ボルト締結時のボルトの貫通方向の圧力を吸収して、モータケースとカバーを保持することができる。 According to the present invention, by providing two elastic members having different rigidity at the bolt fastening portion, the motor torque reaction force is absorbed during motor operation to reduce vibration, and at the same time, the pressure in the bolt penetration direction during bolt fastening is reduced. Absorb and hold the motor case and cover.

モータケースとカバーの構成を説明する図である。It is a figure explaining the composition of a motor case and a cover. モータケースとカバーの締結構造の拡大図である。It is an enlarged view of the fastening structure of a motor case and a cover. （ａ）は、図２のＡ−Ａ断面図であり、（ｂ）は、図２のＢ−Ｂ断面図である。(A) is AA sectional drawing of FIG. 2, (b) is BB sectional drawing of FIG. 図２のカバーのみを図示した拡大図である。FIG. 3 is an enlarged view illustrating only the cover of FIG. 2. （ａ）は、図４のＡ’−Ａ’断面図であり、（ｂ）は図４のＢ’−Ｂ’断面図である。(A) is A'-A 'sectional drawing of FIG. 4, (b) is B'-B' sectional drawing of FIG. 図２のＡ−Ａ断面図で、モータケースとカバーの締結時の締結構造の作用を説明する図である。It is AA sectional drawing of FIG. 2, and is a figure explaining the effect | action of the fastening structure at the time of fastening of a motor case and a cover. （ａ）は図３の（ｂ）のＣ−Ｃ断面図でモータ作動時の締結構造の作用を説明する図であり、（ｂ）は図３の（ｂ）のＤ−Ｄ断面図で、モータ作動時の締結構造の作用を説明する図である。3A is a cross-sectional view taken along the line C-C in FIG. 3B and is a view for explaining the operation of the fastening structure when the motor is operated; FIG. 3B is a cross-sectional view taken along the line D-D in FIG. It is a figure explaining the effect | action of the fastening structure at the time of a motor action | operation.

以下、本発明の実施の形態に係る締結構造を、図面を参照しながら説明する。
実施の形態では、締結構造を、ハイブリッド自動車の車両を駆動するモータを収容するモータケースと、モータケースの開口部を封止するカバーの締結構造に適用した例を説明する。
図１は、モータケースとカバーの構成を説明する図である。
図２は、モータケースとカバーの締結構造の拡大図である。
図３の（ａ）は、図２のＡ−Ａ断面図である。図３の（ｂ）は、図２のＢ−Ｂ断面図である。
図４は、図２のモータケースの取付座部のみを図示した拡大図である。
図５の（ａ）は、図４のＡ’−Ａ’断面図である。図５の（ｂ）は図４のＢ’−Ｂ’断面図である。 Hereinafter, a fastening structure according to an embodiment of the present invention will be described with reference to the drawings.
In the embodiment, an example in which the fastening structure is applied to a fastening structure of a motor case that houses a motor that drives a vehicle of a hybrid vehicle and a cover that seals an opening of the motor case will be described.
FIG. 1 is a diagram illustrating the configuration of a motor case and a cover.
FIG. 2 is an enlarged view of the fastening structure of the motor case and the cover.
(A) of FIG. 3 is AA sectional drawing of FIG. FIG. 3B is a sectional view taken along line BB in FIG.
FIG. 4 is an enlarged view illustrating only a mounting seat portion of the motor case of FIG.
FIG. 5A is a cross-sectional view taken along the line A′-A ′ of FIG. FIG. 5B is a B′-B ′ sectional view of FIG.

モータケース１は、ハイブリッド自動車の不図示のエンジンとトランスミッションの間に配置され、トランスミッションに固定されている。図１に示すように、カバー２は、モータケース１に複数のボルト３により締結されている。モータケース１とカバー２のボルト締結のため、モータケース１には、開口縁に沿って外方へ延びるフランジ１１が形成されている。フランジ１１には、モータケース１に対するカバー２の重ね合わせ方向と平行に延びる複数のネジ穴（不図示）が形成されている。 The motor case 1 is disposed between an unillustrated engine and transmission of the hybrid vehicle and is fixed to the transmission. As shown in FIG. 1, the cover 2 is fastened to the motor case 1 with a plurality of bolts 3. In order to fasten the motor case 1 and the cover 2 with bolts, the motor case 1 is formed with a flange 11 extending outward along the opening edge. The flange 11 is formed with a plurality of screw holes (not shown) extending in parallel with the overlapping direction of the cover 2 with respect to the motor case 1.

図１および図２に示すように、カバー２の外周には、モータケース１とのボルト締結のための取付座部２１が設けられている。取付座部２１は、モータケース１のフランジ１１に形成されたネジ穴に対応する位置に形成されている。 As shown in FIGS. 1 and 2, a mounting seat portion 21 for fastening a bolt with the motor case 1 is provided on the outer periphery of the cover 2. The mounting seat portion 21 is formed at a position corresponding to the screw hole formed in the flange 11 of the motor case 1.

図３の（ａ）および（ｂ）に示すように、取付座部２１には、カバー２の厚み方向に貫通する貫通孔２２が形成されている。貫通孔２２は、ボルト３の軸部３ａが挿通可能であり、かつボルト３の頭部３ｂよりも小さい径を有する。カバー２の貫通孔２２を挿通させたボルト３の軸部３ａを、モータケース１のネジ穴に螺入することで、モータケース１とカバー２が締結される。 As shown in FIGS. 3A and 3B, a through hole 22 that penetrates in the thickness direction of the cover 2 is formed in the mounting seat portion 21. The through-hole 22 has a diameter smaller than that of the head portion 3b of the bolt 3 through which the shaft portion 3a of the bolt 3 can be inserted. The motor case 1 and the cover 2 are fastened by screwing the shaft portion 3 a of the bolt 3 inserted through the through hole 22 of the cover 2 into the screw hole of the motor case 1.

図４および図５の（ａ）および（ｂ）に示すように、カバー２には貫通孔２２の周囲に環状凹部２３ａ、２３ｂと弧状孔２４ａ、２４ｂが形成されている。
環状凹部２３ａ、２３ｂは、貫通孔２２の貫通方向Ｘ（以下、単に「貫通方向Ｘ」ともいう）から見て、貫通孔２２の外周を取り囲むように形成される。環状凹部２３ａは、カバー２のボルト３の頭部３ｂとの対向面２ａの表面から厚み方向中心に向かって座繰り穴を形成することにより設けられる。環状凹部２３ｂは、カバー２のモータケース１との対向面２ｂから厚み方向中心に向かって座繰り穴を形成することにより設けられる。環状凹部２３ａ、２３ｂは、貫通方向Ｘから見て重なる。すなわち、環状凹部２３ａ、２３ｂは、それぞれの底面を形成する部分（以降、「底部２５」という）を共有している。環状凹部２３ａ、２３ｂの厚み方向の長さを同じにして、環状凹部２３ａ、２３ｂが同じ寸法となるようにしても良いが、これに限られず、環状凹部２３ａ、２３ｂの厚み方向の長さは異ならせても良い。 As shown in FIGS. 4 and 5 (a) and (b), the cover 2 is formed with annular recesses 23a and 23b and arc-shaped holes 24a and 24b around the through-hole 22.
The annular recesses 23 a and 23 b are formed so as to surround the outer periphery of the through hole 22 when viewed from the through direction X of the through hole 22 (hereinafter, also simply referred to as “through direction X”). The annular recess 23 a is provided by forming a countersink hole from the surface of the surface 2 a facing the head 3 b of the bolt 3 of the cover 2 toward the center in the thickness direction. The annular recess 23b is provided by forming a countersink hole from the surface 2b of the cover 2 facing the motor case 1 toward the center in the thickness direction. The annular recesses 23 a and 23 b overlap when viewed from the penetration direction X. That is, the annular recesses 23a and 23b share a part forming the bottom surface (hereinafter referred to as “bottom part 25”). The annular recesses 23a and 23b may have the same length in the thickness direction, and the annular recesses 23a and 23b may have the same dimensions. However, the length is not limited to this, and the annular recesses 23a and 23b have a length in the thickness direction. It may be different.

図３の（ａ）および（ｂ）に示すように、環状凹部２３ａ、２３ｂはボルト３の頭部３ｂよりも大きい外径を有する。環状凹部２３ａ、２３ｂには、それぞれ環状の弾性部材であり、ステンレス鋼をメッシュ状にした構造（以下、「ＳＵＳメッシュ構造４ａ、４ｂ」という）が配置されている。ＳＵＳメッシュ構造４ａ、４ｂは、環状凹部２３ａ、２３ｂの内部寸法と同じ寸法を有する。環状凹部２３ａにＳＵＳメッシュ構造４ａを設置すると、ＳＵＳメッシュ構造４ａのボルト３の頭部３ｂとの対向面が、カバー２の対向面２ａと水平となる。環状凹部２３ｂにＳＵＳメッシュ構造４ｂを設置すると、ＳＵＳメッシュ構造４ｂのモータケース１のフランジ１１との対向面が、カバー２の対向面２ｂと水平となる。モータケース１とカバー２を締結した状態で、ＳＵＳメッシュ構造４ａ、４ｂはボルト３の軸部３ａを取り囲み、ＳＵＳメッシュ構造４ａはボルト３の頭部３ｂに接し、ＳＵＳメッシュ構造４ｂはモータケース１のフランジ１１の表面に接する。 As shown in FIGS. 3A and 3B, the annular recesses 23 a and 23 b have a larger outer diameter than the head 3 b of the bolt 3. Each of the annular recesses 23a and 23b is an annular elastic member, and a structure in which stainless steel is meshed (hereinafter referred to as “SUS mesh structures 4a and 4b”) is disposed. The SUS mesh structures 4a and 4b have the same dimensions as the internal dimensions of the annular recesses 23a and 23b. When the SUS mesh structure 4a is installed in the annular recess 23a, the surface facing the head 3b of the bolt 3 of the SUS mesh structure 4a becomes horizontal with the facing surface 2a of the cover 2. When the SUS mesh structure 4b is installed in the annular recess 23b, the facing surface of the SUS mesh structure 4b facing the flange 11 of the motor case 1 is horizontal with the facing surface 2b of the cover 2. In a state where the motor case 1 and the cover 2 are fastened, the SUS mesh structures 4a and 4b surround the shaft 3a of the bolt 3, the SUS mesh structure 4a is in contact with the head 3b of the bolt 3, and the SUS mesh structure 4b is the motor case 1 It contacts the surface of the flange 11.

ＳＵＳメッシュ構造４ａは、圧力によって変形しにくい比較的高剛性の弾性部材で構成する。ＳＵＳメッシュ構造４ａは、例えば、ステンレス鋼のメッシュ構造が高密度のものを用いる。ＳＵＳメッシュ構造４ｂは、モータトルク反力を吸収しやすい、比較的低剛性の弾性部材で構成する。ＳＵＳメッシュ構造４ｂは、例えば、ステンレス鋼のメッシュ構造が低密度のものを用いる。 The SUS mesh structure 4a is composed of a relatively high rigidity elastic member that is not easily deformed by pressure. As the SUS mesh structure 4a, for example, a stainless steel mesh structure having a high density is used. The SUS mesh structure 4b is composed of a relatively low-rigid elastic member that easily absorbs the motor torque reaction force. As the SUS mesh structure 4b, for example, a stainless steel mesh structure having a low density is used.

図４に示すように、弧状孔２４ａ、２４ｂは、貫通方向Ｘから見て環状凹部２３ａ、２３ｂの外周に形成され、カバー２の厚み方向に貫通する。弧状孔２４ａ、２４ｂは、環状凹部２３ａ、２３ｂの外周を所定間隔を空けて取り囲むように形成されており、貫通方向Ｘから見て線対称の形状である。カバー２の、弧状孔２４ａ、２４ｂの間の部分（以降、「接続部２６」という）は、カバー２と同じ厚みを有し、カバー２の対向面２ａと水平である。図５の（ａ）に示すように、環状凹部２３ａ、２３ｂの底部２５は、カバー２の厚み方向中心において、接続部２６に接続している。 As shown in FIG. 4, the arc-shaped holes 24 a and 24 b are formed on the outer periphery of the annular recesses 23 a and 23 b when viewed from the penetration direction X, and penetrate in the thickness direction of the cover 2. The arc-shaped holes 24 a and 24 b are formed so as to surround the outer periphery of the annular recesses 23 a and 23 b with a predetermined interval, and have a line-symmetric shape when viewed from the penetration direction X. A portion of the cover 2 between the arc-shaped holes 24 a and 24 b (hereinafter referred to as “connecting portion 26”) has the same thickness as the cover 2 and is horizontal with the facing surface 2 a of the cover 2. As shown in FIG. 5A, the bottom portions 25 of the annular recesses 23 a and 23 b are connected to the connection portion 26 at the center in the thickness direction of the cover 2.

図２および図３の（ｂ）に示すように、弧状孔２４ａ、２４ｂには、それぞれ弾性プレート５が配置されている。弾性プレート５は、比較的低剛性の板状の弾性部材であり、弧状孔２４ａ、２４ｂに配置されることによって、弧状孔２４ａ、２４ｂの、貫通方向Ｘを中心とする周方向（以下、単に「周方向」という）の端部により、周方向の位置決めがされている。弾性プレート５は弧状孔２４ａ、２４ｂの内部で弾性保持されるものであれば良く、必ずしも弧状孔２４ａ、２４ｂの内部と同じ寸法でなくても良い。モータケース１とカバー２を締結した状態で、弾性プレート５は、ＳＵＳメッシュ構造４ａ、４ｂおよび接続部２６を間に挟んでボルト３の軸部３ａを取り囲む。 As shown in FIG. 2 and FIG. 3B, elastic plates 5 are disposed in the arc-shaped holes 24a and 24b, respectively. The elastic plate 5 is a relatively low-rigid plate-like elastic member, and is disposed in the arc-shaped holes 24a and 24b so that the arc-shaped holes 24a and 24b have a circumferential direction around the penetrating direction X (hereinafter, simply referred to as “circular direction”). Positioning in the circumferential direction is performed by an end portion of “circumferential direction”. The elastic plate 5 only needs to be elastically held inside the arc-shaped holes 24a and 24b, and does not necessarily have the same dimensions as the inside of the arc-shaped holes 24a and 24b. In a state where the motor case 1 and the cover 2 are fastened, the elastic plate 5 surrounds the shaft portion 3a of the bolt 3 with the SUS mesh structures 4a and 4b and the connection portion 26 interposed therebetween.

以下、実施の形態に係る締結構造の作用を説明する。
図６は、図２のＡ−Ａ断面図で、モータケース１とカバー２の締結時の締結構造の作用を説明する図である。
図７は、モータ作動時の締結構造の作用を説明する図であり、（ａ）は図３の（ｂ）のＣ−Ｃ断面図で、（ｂ）は図３の（ｂ）のＤ−Ｄ断面図である。 Hereinafter, the operation of the fastening structure according to the embodiment will be described.
FIG. 6 is a cross-sectional view taken along the line AA in FIG. 2 and is a view for explaining the operation of the fastening structure when the motor case 1 and the cover 2 are fastened.
7A and 7B are views for explaining the operation of the fastening structure when the motor is operated. FIG. 7A is a cross-sectional view taken along the line CC in FIG. 3B and FIG. 7B is a cross-sectional view taken along the line D- in FIG. It is D sectional drawing.

カバー２をモータケース１に締結する際には、カバー２の取付座部２１の環状凹部２３ａ、２３ｂにＳＵＳメッシュ構造４ａ、４ｂを配置し、弧状孔２４ａ、２４ｂに弾性プレート５を配置する。カバー２の取付座部２１の貫通孔２２とモータケース１のフランジ１１のネジ穴（不図示）の位置を合わせ、ボルト３の軸部３ａを貫通孔２２に通す。図６に示すように、ボルト３の頭部３ｂを、貫通方向Ｘを中心とする周方向（以下、単に「周方向」という）に回転させながら、フランジ１１に向かって貫通方向Ｘに押し込むことで、ボルト３の軸部３ａをネジ穴に締結させる。 When the cover 2 is fastened to the motor case 1, the SUS mesh structures 4a and 4b are disposed in the annular recesses 23a and 23b of the mounting seat portion 21 of the cover 2, and the elastic plate 5 is disposed in the arc-shaped holes 24a and 24b. The positions of the through hole 22 of the mounting seat portion 21 of the cover 2 and the screw hole (not shown) of the flange 11 of the motor case 1 are aligned, and the shaft portion 3 a of the bolt 3 is passed through the through hole 22. As shown in FIG. 6, the head 3 b of the bolt 3 is pushed in the penetration direction X toward the flange 11 while rotating in the circumferential direction around the penetration direction X (hereinafter simply referred to as “circumferential direction”). Then, the shaft portion 3a of the bolt 3 is fastened to the screw hole.

ボルト３の頭部３ｂが接触する環状凹部２３ａのＳＵＳメッシュ構造４ａには、ボルト３の頭部３ｂによって貫通方向Ｘにフランジ１１に向かって押圧される。ＳＵＳメッシュ構造４ａは比較的高剛性であるため、貫通方向Ｘの圧力に対する反力が働き、変形が少ない。この反力によって、ボルト締結によって貫通方向Ｘの圧力がかかっても、締結不良が防止され、カバー２とモータケース１が適切に保持される。 The SUS mesh structure 4a of the annular recess 23a with which the head 3b of the bolt 3 contacts is pressed toward the flange 11 in the penetration direction X by the head 3b of the bolt 3. Since the SUS mesh structure 4a is relatively high in rigidity, a reaction force acts on the pressure in the penetration direction X and the deformation is small. Even if a pressure in the penetrating direction X is applied by bolt fastening due to this reaction force, fastening failure is prevented, and the cover 2 and the motor case 1 are appropriately held.

モータの作動時には、モータケース１とカバー２のボルト締結部分にトルク反力が作用し、振動が発生する要因となる。実施の形態では、図７の（ａ）および（ｂ）に示すように、ボルト３の軸部３ａを弧状孔２４ａ、２４ｂに配置された弾性プレート５が取り囲んでいる。弾性プレート５がトルク反力を吸収することによって、振動が低減される。前記したように、弾性プレート５は、比較的低剛性であるため振動を吸収しやすい。また、図７の（ａ）に示すように、ボルト３の軸部３ａを取り囲んでフランジ１１に接触するＳＵＳメッシュ構造４ｂも、比較的低剛性であるためトルク反力を吸収して、振動が低減される。 During the operation of the motor, a torque reaction force acts on the bolt fastening portions of the motor case 1 and the cover 2 to cause vibration. In the embodiment, as shown in FIGS. 7A and 7B, the shaft 3a of the bolt 3 is surrounded by the elastic plate 5 arranged in the arc-shaped holes 24a and 24b. Vibration is reduced by the elastic plate 5 absorbing the torque reaction force. As described above, the elastic plate 5 is relatively low in rigidity, and thus easily absorbs vibration. Further, as shown in FIG. 7A, the SUS mesh structure 4b that surrounds the shaft portion 3a of the bolt 3 and contacts the flange 11 is also relatively low in rigidity so that it absorbs the torque reaction force and generates vibration. Reduced.

以上の通り、実施の形態の締結構造は、
（１）カバー２（第一部材）を、カバー２の厚み方向に貫通するボルト３によりモータケース１（第二部材）に締結する締結構造であって、
カバー２を貫通するボルト３の軸部３ａの外周を取り囲み、カバー２をモータケース１に締結する際にボルト３の頭部３ｂが圧接し、頭部３ｂから受けるボルト３の貫通方向Ｘの圧力を吸収するＳＵＳメッシュ構造４ａ（第１弾性部材）と、
ＳＵＳメッシュ構造４ａの外周側で、ボルト３の軸部３ａの外周を取り囲み、ＳＵＳメッシュ構造４ａよりも低い剛性を有する弾性プレート５（第２弾性部材）と、を備えた。 As described above, the fastening structure of the embodiment is
(1) A fastening structure in which the cover 2 (first member) is fastened to the motor case 1 (second member) by a bolt 3 penetrating in the thickness direction of the cover 2.
The head 3b of the bolt 3 surrounds the outer periphery of the shaft portion 3a of the bolt 3 that penetrates the cover 2 and the cover 3 is fastened to the motor case 1, and the pressure in the penetration direction X of the bolt 3 received from the head 3b SUS mesh structure 4a (first elastic member) that absorbs
On the outer peripheral side of the SUS mesh structure 4a, an elastic plate 5 (second elastic member) surrounding the outer periphery of the shaft portion 3a of the bolt 3 and having rigidity lower than that of the SUS mesh structure 4a is provided.

ＳＵＳメッシュ構造４ａと弾性プレート５の剛性の異なる２つの弾性部材をボルト３の軸部３ａの外周を囲むように設けることによって、剛性の低い弾性プレート５でモータ作動時にトルク反力を吸収して振動吸収を行うと同時に、剛性の高いＳＵＳメッシュ構造４ａの反力によってボルト締結時のボルト３の貫通方向Ｘの圧力を吸収して、モータケース１とカバー２を適切に保持することができる。 By providing two elastic members having different rigidity between the SUS mesh structure 4a and the elastic plate 5 so as to surround the outer periphery of the shaft portion 3a of the bolt 3, the elastic plate 5 having low rigidity absorbs torque reaction force when the motor is operated. Simultaneously with the vibration absorption, the reaction force of the rigid SUS mesh structure 4a absorbs the pressure in the penetration direction X of the bolt 3 at the time of bolt fastening, and the motor case 1 and the cover 2 can be appropriately held.

（２）カバー２は、
カバー２を厚み方向に貫通し、ボルト３の軸部３ａが貫通する貫通孔２２と、
貫通孔２２の貫通方向Ｘから見て、ボルト３の貫通孔２２の外周を取り囲み、ボルト３の頭部３ｂよりも大きな外径を有する環状凹部２３ａ（第１環状凹部）と、
貫通孔２２の貫通方向Ｘから見て、環状凹部２３ａの外周に形成され、カバー２の厚み方向に貫通する弧状孔２４ａ、２４ｂと、を有し、
ＳＵＳメッシュ構造４ａは環状凹部２３ａに収容された環状の弾性部材であり
弾性プレート５は弧状孔２４ａ、２４ｂに収容され、弧状孔２４ａ、２４ｂの周方向端部により周方向の位置決めがされた板状の弾性部材である。 (2) Cover 2 is
A through hole 22 that penetrates the cover 2 in the thickness direction and through which the shaft portion 3a of the bolt 3 passes,
An annular recess 23a (first annular recess) surrounding the outer periphery of the through hole 22 of the bolt 3 and having an outer diameter larger than that of the head 3b of the bolt 3, as viewed from the penetration direction X of the through hole 22;
Arc holes 24a, 24b formed in the outer periphery of the annular recess 23a and penetrating in the thickness direction of the cover 2 when viewed from the penetration direction X of the through hole 22,
The SUS mesh structure 4a is an annular elastic member housed in the annular recess 23a. The elastic plate 5 is housed in the arc-shaped holes 24a and 24b and is positioned in the circumferential direction by the circumferential ends of the arc-shaped holes 24a and 24b. Shaped elastic member.

カバー２にＳＵＳメッシュ構造４ａを収容するための環状凹部２３ａと弾性プレート５を収容するための弧状孔２４ａ、２４ｂを形成することで、ボルト締結時にＳＵＳメッシュ構造４ａと弾性プレート５の位置決めが容易になる。 By forming the annular recess 23a for accommodating the SUS mesh structure 4a and the arc-shaped holes 24a and 24b for accommodating the elastic plate 5 in the cover 2, the positioning of the SUS mesh structure 4a and the elastic plate 5 is easy at the time of bolt fastening. become.

（３）環状凹部２３ａの外周に、所定間隔を空けて取り囲むように２つの弧状孔２４ａ、２４ｂが形成され、それぞれの弧状孔２４ａ、２４ｂに弾性プレート５が収容される。 (3) Two arc-shaped holes 24a and 24b are formed on the outer periphery of the annular recess 23a so as to surround them at a predetermined interval, and the elastic plate 5 is accommodated in each of the arc-shaped holes 24a and 24b.

弧状孔２４ａ、２４ｂを、所定間隔を空けて複数形成することで、各弧状孔２４ａ、２４ｂの間の部分にＳＵＳメッシュ構造４ａを収容する環状凹部２３ａが接続する接続部２６を確保することができ、かつ各弧状孔２４ａ、２４ｂに弾性プレート５を配置することで、ボルト３の軸部３ａの周囲を取り囲むように弾性プレート５を配置することができる。 By forming a plurality of arc-shaped holes 24a and 24b at predetermined intervals, it is possible to secure a connection portion 26 to which an annular recess 23a that accommodates the SUS mesh structure 4a is connected in a portion between the arc-shaped holes 24a and 24b. The elastic plate 5 can be disposed so as to surround the shaft portion 3a of the bolt 3 by arranging the elastic plate 5 in each arcuate hole 24a, 24b.

（４）環状凹部２３ａは、カバー２のボルト３の頭部３ｂとの対向面２ａから厚み方向中心に向けて形成され、
カバー２は、モータケース１のフランジ１１との対向面２ｂから厚み方向中心に向けて形成され、貫通孔２２の貫通方向Ｘから見て、ボルト３の貫通孔２２の外周を取り囲み、ボルト３の頭部３ｂよりも大きな外径を有する環状凹部２３ｂ（第２環状凹部）を有し、
環状凹部２３ｂに、ＳＵＳメッシュ構造４ａよりも剛性が低く、モータ作動時にトルク反力を吸収して振動を吸収するＳＵＳメッシュ構造４ｂが設けられる。 (4) The annular recess 23a is formed from the surface 2a facing the head 3b of the bolt 3 of the cover 2 toward the center in the thickness direction,
The cover 2 is formed from the surface 2 b facing the flange 11 of the motor case 1 toward the center in the thickness direction, and surrounds the outer periphery of the through hole 22 of the bolt 3 when viewed from the through direction X of the through hole 22. Having an annular recess 23b (second annular recess) having an outer diameter larger than the head 3b,
The annular recess 23b is provided with a SUS mesh structure 4b that has lower rigidity than the SUS mesh structure 4a and absorbs torque reaction force and absorbs vibration when the motor is operated.

環状凹部２３ａ、２３ｂそれぞれにＳＵＳメッシュ構造４ａ、４ｂを収容することで、高剛性のＳＵＳメッシュ構造４ａによって、ボルト締結時のボルト３の頭部３ｂからモータケース１のフランジ１１に向かう貫通方向Ｘの圧力を吸収することができると同時に、低剛性のＳＵＳメッシュ構造４ｂによって、モータ作動時にトルク反力を吸収して振動を吸収することができる。 By housing the SUS mesh structures 4a and 4b in the annular recesses 23a and 23b, the penetration direction X from the head 3b of the bolt 3 to the flange 11 of the motor case 1 at the time of bolt fastening is achieved by the highly rigid SUS mesh structure 4a. The low-stiff SUS mesh structure 4b can absorb the torque reaction force and absorb the vibration when the motor is operated.

（変形例１）
実施の形態では、カバー２の取付座部２１に２つの弧状孔２４ａ、２４ｂを形成する例を説明したが、弧状孔の数は２つに限定されず、例えば、３以上の弧状孔を間隔を空けて設け、それぞれに弾性プレート５を配置するようにしても良い。 (Modification 1)
In the embodiment, the example in which the two arc-shaped holes 24a and 24b are formed in the mounting seat portion 21 of the cover 2 has been described. However, the number of the arc-shaped holes is not limited to two. It is also possible to provide the elastic plates 5 and to dispose the elastic plates 5 respectively.

（変形例２）
実施の形態では、環状凹部２３ａ、２３ｂにそれぞれにＳＵＳメッシュ構造４ａ、４ｂを配置したが、ボルト３の頭部３ｂ側の環状凹部２３ａのみにＳＵＳメッシュ構造４ａを配置しても良い。 (Modification 2)
In the embodiment, the SUS mesh structures 4a and 4b are disposed in the annular recesses 23a and 23b, respectively. However, the SUS mesh structure 4a may be disposed only in the annular recess 23a on the head 3b side of the bolt 3.

１モータケース
２カバー
２ａボルトの頭部との対向面
２ｂモータケースのフランジとの対向面
３ボルト
３ａ軸部
３ｂ頭部
４ａ、４ｂＳＵＳメッシュ構造
５弾性プレート
１１フランジ
２１取付座部
２２貫通孔
２３ａ、２３ｂ環状凹部
２４ａ、２４ｂ弧状孔
２５底部
２６接続部
Ｘ貫通孔の貫通方向 DESCRIPTION OF SYMBOLS 1 Motor case 2 Cover 2a Opposite surface 2b with a bolt head Opposite surface 3b with a motor case flange 3 Bolt 3a Shaft part 3b Head part 4a, 4b SUS mesh structure 5 Elastic plate 11 Flange 21 Mounting seat part 22 Through-hole 23a , 23b Annular recess 24a, 24b Arc-shaped hole 25 Bottom part 26 Connection part X Through-hole penetration direction

Claims

A fastening structure for fastening the first member to the second member with a bolt penetrating in the thickness direction of the first member,
Surrounding the outer periphery of the shaft portion of the bolt that penetrates the first member, and when the first member is fastened to the second member, the head portion of the bolt is in pressure contact, and the bolt penetration direction received from the head portion A first elastic member that absorbs the pressure of
A fastening structure comprising: a second elastic member that surrounds the outer periphery of the shaft portion of the bolt on the outer peripheral side of the first elastic member and has lower rigidity than the first elastic member.

The first member is
A through-hole that penetrates the first member in the thickness direction, and through which the shaft portion of the bolt penetrates,
A first annular recess that surrounds the outer periphery of the through hole of the bolt and has an outer diameter larger than the head of the bolt, as viewed from the through direction of the through hole;
An arc-shaped hole formed on the outer periphery of the first annular recess and penetrating in the thickness direction of the first member as seen from the penetration direction of the through-hole,
The first elastic member is an annular elastic member accommodated in the first annular recess, and the second elastic member is accommodated in the arc-shaped hole, and is positioned in the circumferential direction by the circumferential end of the arc-shaped hole. The fastening structure according to claim 1, wherein the fastening structure is a shaped elastic member.

3. The arcuate hole is formed in plural around the outer periphery of the first annular recess with a predetermined interval, and the second elastic member is accommodated in each arcuate hole. Fastening structure.

The first annular recess is formed from the surface of the first member facing the head of the bolt toward the center in the thickness direction,
The first member is formed from the surface of the first member facing the second member toward the center in the thickness direction, and surrounds the outer periphery of the through hole of the bolt when viewed from the through direction of the through hole, Having a second annular recess having an outer diameter larger than the head of the bolt;
The second annular recess is lower in rigidity than the first elastic member, and the second member is pressed against the second member when the first member is fastened to the second member, and the bolt penetrates from the second member. The fastening structure according to claim 2, wherein a third elastic member that absorbs pressure in the direction is provided.