JP2004304857A

JP2004304857A - Motor-mounting structure

Info

Publication number: JP2004304857A
Application number: JP2003091129A
Authority: JP
Inventors: Yuji Yamashita; 祐司山下; Hidehiro Hakamata; 英洋袴田
Original assignee: Asmo Co Ltd
Current assignee: Asmo Co Ltd
Priority date: 2003-03-28
Filing date: 2003-03-28
Publication date: 2004-10-28
Anticipated expiration: 2023-03-28
Also published as: JP4417647B2

Abstract

<P>PROBLEM TO BE SOLVED: To offer a motor-mounting structure which can be easily assembled, while suppressing an increase in the number of parts. <P>SOLUTION: In the motor-mounting structure, a motor housing 3, which is arranged in a perpendicular to a motor-mounting face 1a where a hole 1b for an output shaft for accommodating an output shaft 4 is made, is fixed to it with bolts 16. A first circular elastic member 12, which is arranged outside the hole 1b for the output shaft so as to absorb the shock on the proximity side in the axial direction, is interposed between the motor-mounting face 1a and the motor housing 3. A fixing part 6b, that extends outwardly in the radial direction of the first elastic member 12, is formed in the motor housing 3. Then, an elastic guard 14c, which is a second elastic member 14 for absorbing shock on the side of axial separation, is interposed in between the fixing part 6b and the head 16b of a bolt 16, and the tube 14a of the second elastic member 14 for absorbing diametrical shock is interposed in between the fixing hole 6c of the fixing part 6b and the shank 16a of the bolt 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、モータのモータハウジングをモータ取付面に対して固定するモータ取付構造に関し、特に電動パワーステアリング装置におけるモータ取付構造として好適なものである。
【０００２】
【従来の技術】
従来、電動パワーステアリング装置としては、ステアリングの操作力をモータの駆動力にてアシストすべく、車両のコラムに設けられたモータ取付面に対してモータ（モータハウジング）を固定したものがある。このようなモータ固定構造としては、ゴム製の防振部材（弾性部材）を介してモータハウジングをモータ取付面に対して固定する構造（所謂フローティング支持構造）がある（例えば、特許文献１参照）。
【０００３】
このモータ取付構造では、モータハウジングには径方向（取付方向の直交方向）外側に延びる固定部が形成され、その固定部を貫通してモータ取付面に螺合されるボルトと貫通される固定部との間に弾性部材が設けられる。詳しくは、この弾性部材は、筒部と、筒部の一端から径方向外側に延びる鍔部と、筒部の他端から径方向外側に延びる鍔部とを有する。そして、筒部が固定部の孔の内周とボルトの軸部との間に介在されて径方向の衝撃を吸収する。又、一端側の鍔部がモータ取付面と固定部におけるモータ取付面側の面との間に介在されて軸方向近接側（モータ取付面に対しモータハウジングが近接する側）の衝撃を吸収する。又、他端側の鍔部がボルトの頭部と固定部における頭部側の面との間に介在されて軸方向離間側（モータ取付面に対しモータハウジングが離間する側）の衝撃を吸収する。よって、モータの駆動によるモータハウジングの振動がモータ取付面側に伝達されることは、弾性部材の各部の働きにより低減される。その結果、ステアリングに振動が伝達されることは低減される。
【０００４】
【特許文献１】
特開２０００−３５０３９７号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、上記のようなモータ取付構造では、弾性部材の両端に鍔部が形成されるため、弾性部材を固定部に組み付ける際、一方の鍔部を径方向内側に大きく撓ませながら固定部の孔に挿入する必要があり、その組み付け作業が困難（特に自動組み付けが困難）であった。尚、弾性部材の鍔部を撓め易く（薄く）設定して挿入し易くする構造とした場合では、モータ全体の支持を不安定としてしまうといった弊害がある。
【０００６】
又、前記弾性部材を、筒部の中間部で２つに分断し、該２つの部材を固定部の孔に両方から組み付けるようにすると、鍔部を撓める必要がなくなり、組み付け作業が容易となるが、この場合、部品点数が増大（ボルト毎に倍増）してしまうとともに、組み付け工数が増大してしまうという問題がある。
【０００７】
本発明は、上記問題点を解決するためになされたものであって、その目的は、部品点数の増大を抑制しながら、容易に組み付けることができるモータ取付構造を提供することにある。
【０００８】
【課題を解決するための手段】
請求項１に記載の発明は、出力軸を収容するための出力軸用孔が形成されたモータ取付面に対し、垂直方向に配置されるモータハウジングがボルトにて固定されるモータ取付構造であって、前記モータ取付面と前記モータハウジングとの間には、前記出力軸用孔の外側に配置され軸方向近接側の衝撃を吸収するための環状の第１弾性部材が介在され、前記モータハウジングには、前記第１弾性部材の径方向外側に延びる固定部が形成され、前記固定部と前記ボルトの頭部との間、及び前記固定部と前記ボルトの軸部との間には、両間に配置される両間部分からなり軸方向離間側の衝撃を吸収するとともに径方向の衝撃を吸収するための第２弾性部材が介在された。
【０００９】
請求項２に記載の発明は、請求項１に記載のモータ取付構造において、前記第１弾性部材は、モータ取付面と前記モータハウジングとの径方向の衝撃をも吸収するように設けられた。
【００１０】
請求項３に記載の発明は、請求項２に記載のモータ取付構造において、前記第１弾性部材には、径方向外側に延び前記ボルトと径方向に係合して前記径方向の衝撃を吸収するための延設部が一体形成された。
【００１１】
請求項４に記載の発明は、請求項１乃至３のいずれか１項に記載のモータ取付構造において、前記第２弾性部材と前記ボルトの前記軸部との間には、前記モータ取付面と前記ボルトの前記頭部との間隔を規定するためのカラーが配設された。
【００１２】
請求項５に記載の発明は、請求項４に記載のモータ取付構造において、前記カラーの前記モータ取付面側の端部には、径方向外側に延びる鍔部が形成された。請求項６に記載の発明は、請求項４又は５に記載のモータ取付構造において、前記カラーにおける前記頭部側の端部の外周には、ワッシャが配設された。
【００１３】
請求項７に記載の発明は、請求項６に記載のモータ取付構造において、前記ワッシャは、前記モータハウジングが前記ボルトにて固定されていない状態で、前記第２弾性部材を軸方向に圧縮しないように設定されて前記カラーに固定された。
【００１４】
請求項８に記載の発明は、請求項５乃至７のいずれか１項に記載のモータ取付構造において、前記鍔部の外径は、前記固定部の孔の内径以下に設定され、前記第２弾性部材の前記モータ取付面側の端部には、前記固定部の前記孔の内径より径方向外側に突出するフック部が形成された。
【００１５】
請求項９に記載の発明は、出力軸を収容するための出力軸用孔が形成されたモータ取付面に対し、垂直方向に配置されるモータハウジングがボルトにて固定されるモータ取付構造であって、前記モータ取付面と前記モータハウジングとの間には、前記出力軸用孔の外側に配置され軸方向近接側の衝撃を吸収するとともに径方向の衝撃を吸収するための第１弾性部材が介在され、前記モータハウジングには、前記第１弾性部材の径方向外側に延びる固定部が形成され、前記固定部と前記ボルトの頭部との間、及び前記固定部と前記ボルトの軸部との間には、軸方向離間側の衝撃を吸収するとともに径方向の衝撃を吸収するための第２弾性部材が介在された。
【００１６】
（作用）
請求項１に記載の発明によれば、モータハウジングは、モータ取付面に対し、第１弾性部材にて軸方向近接側への衝撃が吸収されるように、且つ第２弾性部材にて軸方向離間側及び径方向への衝撃が吸収されるように固定される。そして、第１弾性部材は、モータ取付面とモータハウジングとの間で出力軸用孔の外側に配置される環状であるため、部品点数が１つとなる。しかも、第２弾性部材は、第１弾性部材の径方向外側に配置され、軸方向近接側への衝撃を吸収するためのものではないため、簡単な形状として、反モータ取付面側から固定部に容易に組み付けることができる。これらのことから、部品点数の増大を抑制しながら、モータハウジングを容易に組み付けることができる。しかも、第１弾性部材は環状であるため、出力軸が収容される出力軸用孔内への粉塵等の異物の浸入は防止される。
【００１７】
請求項２に記載の発明によれば、第２弾性部材に加え、第１弾性部材にてモータ取付面とモータハウジングとの径方向の衝撃が吸収される。このように、前記径方向の衝撃は、第１及び第２弾性部材にて径方向に異なる位置で吸収されるため、モータハウジングからモータ取付面への振動の伝達を更に低減させることができる。
【００１８】
請求項３に記載の発明によれば、第１弾性部材には、径方向外側に延び前記ボルトと径方向に係合して径方向の衝撃を吸収するための延設部が一体形成されるため、部品点数の増加を抑制しながら、モータハウジングからモータ取付面への振動の伝達を更に低減させることができる。
【００１９】
請求項４に記載の発明によれば、第２弾性部材とボルトの軸部との間には、モータ取付面とボルトの頭部との間隔を規定するためのカラーが配設されるため、モータ取付面とボルトの頭部との間隔が一定となる。よって、第１及び第２弾性部材が過剰に圧縮されて破損するといったことが防止されるとともに、防振効果を容易に一定とすることができる。
【００２０】
請求項５に記載の発明によれば、カラーのモータ取付面側の端部には、径方向外側に延びる鍔部が形成されるため、カラーとモータ取付面との接触面積が大きくなって単位面積当たりの圧力が小さくなり、カラーやモータ取付面の損傷が防止される。
【００２１】
請求項６に記載の発明によれば、カラーにおける頭部側の端部の外周には、ワッシャが配設されるため、ボルトがモータ取付面に対して螺合されていく際に、その頭部が第２弾性部材を押圧接触しながら捩ってしまうことが防止される。よって、第２弾性部材の損傷や第２弾性部材による防振効果の低下を防止することができる。
【００２２】
請求項７に記載の発明によれば、ワッシャは、モータハウジングがボルトにて固定されていない状態で、第２弾性部材を軸方向に圧縮しないように設定されてカラーに固定される。よって、カラーやワッシャが固定されボルトにて固定される前の状態で、モータハウジング側の部材、即ちモータを、例えば、保存管理したり搬送しても、第２弾性部材が損傷することが低減される。しかも、モータハウジングがボルトにて固定される前の状態では、ワッシャが第２弾性部材から押圧されないので、該ワッシャをカラーに容易に固定することができる。
【００２３】
請求項８に記載の発明によれば、カラーの鍔部の外径は、固定部の孔の内径以下に設定され、第２弾性部材のモータ取付面側の端部には、固定部の孔の内径より径方向外側に突出するフック部が形成される。このようにすると、カラー及び第２弾性部材を（例えば予め組み付けて）共に一方から固定部の孔に容易に挿入することができる。しかも、第２弾性部材のフック部にて第２弾性部材が反モータ取付面側に抜けてしまうことが防止され、即ち仮止めがなされる。
【００２４】
請求項９に記載の発明によれば、モータ取付面とモータハウジングとの径方向の衝撃は、第１及び第２弾性部材にて径方向に異なる位置で吸収される。よって、モータハウジングからモータ取付面への振動の伝達を低減させることができる。
【００２５】
【発明の実施の形態】
以下、本発明を電動パワーステアリング装置におけるモータ取付構造に具体化した一実施の形態を図１〜図３に従って説明する。図１に示すように、車両のコラムを構成するコラム部材１には、モータ取付面１ａが形成され、該モータ取付面１ａにはモータ２のモータハウジング３が固定されている。
【００２６】
モータ取付面１ａ（コラム部材１）には、図示しないステアリングに連結される出力軸４を収容するための出力軸用孔１ｂ及び雌ねじ部１ｃが形成されている。尚、本実施の形態のコラム部材１はアルミ合金よりなる。
【００２７】
モータ２は、略有底筒形状に形成されるヨーク５及びヨーク５の開口部を覆うエンドハウジング６から構成される前記モータハウジング３と、ヨーク５の内周面に固着されるマグネット７と、モータハウジング３内に回転可能に保持されるロータ８等を備える。
【００２８】
エンドハウジング６においてヨーク５の底部の反対側（図１中、左側）の一端面には、円筒状に膨出した膨出部６ａ（図３参照）が形成され、その膨出部６ａの内周側には軸受９を介してロータ８の回転軸８ａの一端側が回転可能に支持される。この回転軸８ａは、前記出力軸４に連結されることになる。又、膨出部６ａは、その外径が前記出力軸用孔１ｂの内径より若干小さく（即ち出力軸用孔１ｂに遊嵌可能に）設定されている。又、エンドハウジング６の外周には、径方向外側に延びる固定部６ｂが形成されている。この固定部６ｂには軸方向（図１中、左右方向）に貫通した孔としての固定孔６ｃが形成されている。本実施の形態では、固定部６ｂは等角度（１８０度）間隔で２つ形成されている。尚、図１に示す断面は、一平面を切った断面ではなく、一方の固定部６ｂの断面を（図１中、下側に）図示するとともに、外部からの電源供給線１１近傍の断面を（図１中、上側に）図示している。
【００２９】
図２に示すように、エンドハウジング６のモータ取付面１ａ側の端面には、前記膨出部６ａに外嵌されるように環状の第１弾性部材１２（図３参照）が配設される。尚、本実施の形態の第１弾性部材１２はゴム材よりなる。
【００３０】
又、前記固定部６ｂには、カラー１３、第２弾性部材１４及びワッシャ１５が配設される。
詳しくは、カラー１３は、その外径が固定孔６ｃの内径より小さい略円筒形状に形成され、その軸方向長さは前記固定孔６ｃの軸方向長さより長く形成されている。又、カラー１３のモータ取付面１ａ側の端部（一端部）には、径方向外側に延びる鍔部１３ａが形成されている。この鍔部１３ａは、その外径が固定孔６ｃの内径と略同じ（内嵌可能）に設定されている。尚、本実施の形態のカラー１３は、鉄鋼材等よりなる。
【００３１】
第２弾性部材１４は、ゴム材よりなる。第２弾性部材１４は、前記カラー１３に外嵌可能且つ前記固定孔６ｃに内嵌可能な筒部１４ａと、筒部１４ａの一端（図１及び図２中、左側端）から径方向外側に突出するフック部１４ｂと、筒部１４ａの他端（図１及び図２中、右側端）から径方向外側に延びる弾性鍔部１４ｃとを有する。尚、本実施の形態では、筒部１４ａと弾性鍔部１４ｃが両間部分を構成している。フック部１４ｂは、その最大の外径が固定孔６ｃの内径より若干大径となるように形成されている。又、フック部１４ｂは、その外径が一端側に向かうほど小径とされ、第２弾性部材１４を固定孔６ｃに一端側から挿入する際に容易に（第２弾性部材１４の他端側を付勢していくだけで）撓んで挿入されるように設定されている。
【００３２】
ワッシャ１５は、円盤形状に形成され、その外径が前記弾性鍔部１４ｃの外径と同じに設定され、その内径が前記カラー１３の他端部に外嵌（圧入）可能に設定されている。そして、カラー１３、第２弾性部材１４及びワッシャ１５は、予めカラー１３に第２弾性部材１４が外嵌され、更にワッシャ１５がカラー１３の他端部に外嵌（圧入固定）されて組み付けられる（ワッシャ組付工程）。そして、その部材（カラー１３、第２弾性部材１４及びワッシャ１５）は、その一端側から固定孔６ｃに挿入されて組み付けられる。尚、この状態（図２参照）で、フック部１４ｂは固定部６ｂの一端面と係合し、第２弾性部材１４が他端側に抜けてしまうことが防止される。又、各部材の軸方向の長さは、この状態（図２参照）で、第２弾性部材１４の弾性鍔部１４ｃが軸方向に圧縮されないように設定されている。又、この状態で、第１弾性部材１２は、カラー１３（鍔部１３ａ）より一端側（モータ取付面１ａ側）に突出するように軸方向の厚さが設定されている。
【００３３】
そして、上記モータハウジング３は、固定孔６ｃ（カラー１３）を貫通してモータ取付面１ａの雌ねじ部１ｃに螺合されるボルト１６にてモータ取付面１ａに対して（軸が）垂直方向に配置されるように固定される（固定工程）。
【００３４】
詳しくは、ボルト１６は、雄ねじが形成された軸部１６ａと、その端部（図１及び図２中、右側端部）に形成された頭部１６ｂとからなる。そして、軸部１６ａを雌ねじ部１ｃに螺合していくと、頭部１６ｂがカラー１３の他端部及びワッシャ１５を押圧し、該ワッシャ１５を介して第２弾性部材１４の弾性鍔部１４ｃが軸方向に圧縮され、且つ弾性鍔部１４ｃ及び固定部６ｂ等を介して第１弾性部材１２が軸方向に圧縮されていく。そして、カラー１３の鍔部１３ａがモータ取付面１ａに当接すると、カラー１３にてボルト１６のそれ以上の移動（頭部１６ｂのモータ取付面１ａ側への移動）が規制される。
【００３５】
これにより、モータハウジング３（モータ２）は、モータ取付面１ａに対して支持固定される。又、第１弾性部材１２は、モータ取付面１ａとモータハウジング３（エンドハウジング６）との間に介在され、モータ２の駆動時の振動に基づく軸方向近接側（モータ取付面１ａに対しモータハウジング３が近接する側）の衝撃を吸収する。又、第２弾性部材１４の弾性鍔部１４ｃは、固定部６ｂとボルト１６の頭部１６ｂとの間に介在され、モータ２の駆動時の振動に基づく軸方向離間側（モータ取付面１ａに対しモータハウジング３が離間する側）の衝撃を吸収する。又、第２弾性部材１４の筒部１４ａは、固定孔６ｃの内周面とボルト１６の軸部１６ａ（詳しくはカラー１３）との間に介在され、モータ２の駆動時の振動に基づく径方向の衝撃を吸収する。更に、本実施の形態では、第１弾性部材１２は、モータ取付面１ａとモータハウジング３（エンドハウジング６）とにより挟持されることと、その内周面がエンドハウジング６の膨出部６ａの外周面に当接されることで、前記径方向の衝撃をも吸収する。
【００３６】
よって、モータ２の駆動によるモータハウジング３の振動が減衰されモータ取付面１ａ側に振動が伝達されることは低減される。その結果、ステアリングに振動が伝達されることは低減される。
【００３７】
次に、上記実施の形態の特徴的な作用効果を以下に記載する。
（１）モータ取付面１ａとモータハウジング３との軸方向近接側への衝撃を吸収するための第１弾性部材１２は、モータ取付面１ａとモータハウジング３との間で出力軸用孔１ｂの外側に配置される環状であるため、部品点数が１つとなる。しかも、軸方向離間側及び径方向への衝撃を吸収するための第２弾性部材１４は、軸方向近接側への衝撃を吸収するためのものではないため、簡単な（一端に鍔部が形成されていない）形状として、反モータ取付面側（図１中、右側）から固定部６ｂに容易に組み付けること（固定孔６ｃに挿入すること）ができる。これらのことから、部品点数の増大を抑制しながら、モータハウジング３を容易に組み付けることができる。しかも、第１弾性部材１２は環状であるため、出力軸用孔１ｂ内への粉塵等の異物の浸入が防止される。
【００３８】
（２）第１弾性部材１２は、モータ取付面１ａとモータハウジング３（エンドハウジング６）とにより挟持されることと、その内周面がエンドハウジング６の膨出部６ａの外周面に当接されることで、径方向の衝撃をも吸収する。このように、前記径方向の衝撃は、第１及び第２弾性部材１２，１４にて径方向に異なる位置で吸収されるため、（従来技術に比べて）モータハウジング３からモータ取付面１ａへの振動の伝達を更に低減させることができる。又、モータハウジング３をモータ取付面１ａに安定して支持固定することができる。言い換えると、モータハウジング３側の部材、即ちモータ２が自重等で傾いて支持されてしまうことが低減される。
【００３９】
（３）第２弾性部材１４とボルト１６の軸部１６ａとの間には、モータ取付面１ａとボルト１６の頭部１６ｂとの間隔を規定するためのカラー１３が配設されるため、モータ取付面１ａとボルト１６の頭部１６ｂとの間隔が一定となる。よって、第１及び第２弾性部材１２，１４が過剰に圧縮されて破損するといったことが防止されるとともに、防振効果を容易に一定とすることができる。
【００４０】
（４）カラー１３の一端部（モータ取付面１ａ側の端部）には、径方向外側に延びる鍔部１３ａが形成されるため、カラー１３とモータ取付面１ａとの接触面積が大きくなって単位面積当たりの圧力が小さくなり、カラー１３やモータ取付面１ａの損傷が防止される。
【００４１】
（５）カラー１３における他端部の外周には、ワッシャ１５が配設されるため、ボルト１６（軸部１６ａ）がモータ取付面１ａ（雌ねじ部１ｃ）に対して螺合されていく際に、頭部１６ｂはワッシャ１５と当接し、頭部１６ｂが第２弾性部材１４の弾性鍔部１４ｃを押圧接触しながら捩ってしまうことが防止される。よって、第２弾性部材１４が損傷してしまうことや、第２弾性部材１４の防振効果が低下してしまうことを防止することができる。
【００４２】
（６）ワッシャ１５は、モータハウジング３がボルト１６にて固定されていない状態（固定工程前）で、第２弾性部材１４の弾性鍔部１４ｃを軸方向に圧縮しないように設定されてカラー１３の他端部に固定される（ワッシャ組付工程）。よって、モータハウジング３がボルト１６にて固定される前の状態で、モータハウジング３側の部材、即ちモータ２を、例えば、保存管理したり搬送しても、第２弾性部材１４が損傷することが低減される。しかも、モータハウジング３がボルト１６にて固定される前の状態では、ワッシャ１５が第２弾性部材１４から押圧されないので、ワッシャ１５をカラー１３に容易に固定することができる。
【００４３】
（７）カラー１３の鍔部１３ａの外径は、固定孔６ｃの内径と略同じ（内嵌可能）に設定され、第２弾性部材１４の一端部には、固定孔６ｃの内径より径方向外側に突出するフック部１４ｂが形成される。よって、カラー１３及び第２弾性部材１４を（予め組み付けて）共に、その一端側から固定孔６ｃに容易に挿入することができる。しかも、第２弾性部材１４のフック部１４ｂが固定部６ｂの一端面と係合することで、第２弾性部材１４が他端側（反モータ取付面側）に抜けてしまうことが防止され、即ち仮止めがなされる。よって、その状態での保存管理や搬送が容易となる。
【００４４】
上記実施の形態は、以下のように変更して実施してもよい。
・上記実施の形態の第１弾性部材１２は、少なくとも軸方向近接側の衝撃を吸収するためのものであればよく、第２弾性部材１４は、軸方向離間側の衝撃を吸収するとともに径方向の衝撃を吸収するためのものであればよく、例えば、図４〜図６に示すように変更してもよい。
【００４５】
図４〜図６に示すように、第１弾性部材２１は、上記実施の形態の第１弾性部材１２と同様の環状に形成された環状部２１ａと、その環状部２１ａから径方向外側に延びボルト１６と径方向に係合して（詳しくは、カラー１３が嵌挿されて）前記径方向の衝撃を吸収する肉薄の延設部２１ｂとを有する。第２弾性部材２２は、上記実施の形態の第２弾性部材１４の一端側を削除した（フック部１４ｂ及び筒部１４ａの一部が形成されていない）形状であって、上記実施の形態の筒部１４ａより短い筒部２２ａと、上記実施の形態の弾性鍔部１４ｃと同様の弾性鍔部２２ｂとを有する。
【００４６】
この例では、第１弾性部材２１、カラー１３、第２弾性部材２２及びワッシャ１５が、この順でモータハウジング３（エンドハウジング６）の固定部６ｂに対して組み付けられる。尚、この状態（図５参照）では、カラー１３の鍔部１３ａが延設部２１ｂと軸方向に係合し、カラー１３の他端部に固定されたワッシャ１５が第２弾性部材２２の弾性鍔部２２ｂと軸方向に係合することで、各部材（第２弾性部材２２等）が脱落して（抜けて）しまうことが防止される。又、各部材の軸方向の長さは、この状態（図５参照）で、第２弾性部材２２の弾性鍔部２２ｂが軸方向に圧縮されないように設定されている。又、この状態で、第１弾性部材２１の環状部２１ａは、カラー１３（鍔部１３ａ）より一端側（モータ取付面１ａ側）に突出するように軸方向の厚さが設定されている。そして、モータハウジング３は、上記実施の形態と同様に固定孔６ｃ（カラー１３）を貫通してモータ取付面１ａの雌ねじ部１ｃに螺合されるボルト１６にてモータ取付面１ａに対して固定される。
【００４７】
このようにすると、第１弾性部材２１の延設部２１ｂがボルト１６と径方向に係合することで（詳しくは、カラー１３が嵌挿されることで）前記径方向の衝撃が更に吸収される。よって、部品点数の増加を抑制しながら、モータハウジング３からモータ取付面１ａへの振動の伝達を更に低減させることができる。
【００４８】
・上記実施の形態では、第１弾性部材１２は、その内周面がエンドハウジング６の膨出部６ａの外周面に当接されること等から径方向の衝撃をも吸収するとしたが、径方向の衝撃を吸収しないようにしてもよい。尚、前記径方向の衝撃を吸収しないとは、軸方向に挟持されることの摩擦により径方向の衝撃を吸収する程度を除き、それ以上に吸収しないという意味である。即ち、第１弾性部材１２がエンドハウジング６と径方向に当接していない構成としてもよい。このようにしても、上記実施の形態の効果（１）、（３）〜（７）と同様の効果を得ることができる。
【００４９】
・上記実施の形態では、第２弾性部材１４とボルト１６の軸部１６ａとの間にカラー１３を配設したが、カラー１３を省略した構成としてもよい。尚、この場合、固定孔６ｃや第２弾性部材１４の筒部１４ａの径を変更する必要がある。このようにしても、上記実施の形態の効果（１）、（２）と同様の効果を得ることができる。
【００５０】
・上記実施の形態では、カラー１３の一端部（モータ取付面１ａ側の端部）には、径方向外側に延びる鍔部１３ａを形成したが、鍔部１３ａが形成されていないカラーとしてもよい。このようにしても、上記実施の形態の効果（１）〜（３）、（５）、（６）と同様の効果を得ることができる。
【００５１】
・上記実施の形態では、カラー１３における他端部の外周にワッシャ１５を配設したが、該ワッシャ１５を省略した構成としてもよい。尚、この場合、カラー１３や第２弾性部材１４（弾性鍔部１４ｃ）の軸方向の長さを変更する必要がある。このようにしても、上記実施の形態の効果（１）〜（４）、（７）と同様の効果を得ることができる。
【００５２】
・上記実施の形態では、カラー１３の鍔部１３ａの外径は、固定孔６ｃの内径と略同じ（内嵌可能）に設定されるとしたが、鍔部１３ａの外径を固定孔６ｃの内径より大きく設定してもよい。尚、この場合、カラーを固定部６ｂ（固定孔６ｃ）に対してモータ取付面１ａ側から移動させて組み付ける（例えば、第２弾性部材１４、カラー及びワッシャ１５をこの順で固定部６ｂに対して組み付ける）必要がある。このようにしても、上記実施の形態の効果（１）〜（６）と同様の効果を得ることができる。
【００５３】
・上記実施の形態では、第１弾性部材１２を環状としたが、膨出部６ａの外周に間隔を有して複数設けられる第１弾性部材としてもよい。又、第２弾性部材１４のフック部１４ｂを、モータ取付面１ａとモータハウジング３（固定部６ｂ）との間に介在され軸方向近接側の衝撃を吸収するための弾性鍔部に変更してもよい。尚、この場合、弾性鍔部を撓めて組み付けたり、第２弾性部材を２つに分割する必要がある。このようにしても、上記実施の形態の効果（２）と同様の効果を得ることができる。
【００５４】
・上記実施の形態では、電動パワーステアリング装置におけるモータ取付構造に具体化したが、同様の取付構造を有する他の装置におけるモータ取付構造に具体化してもよい。
【００５５】
上記各実施の形態から把握できる技術的思想について、以下にその効果とともに記載する。
（イ）請求項６に記載のモータ取付構造における前記モータハウジングを前記モータ取付面に固定するモータ固定方法であって、前記ワッシャを、前記モータハウジングが前記ボルトにて固定されていない状態で前記第２弾性部材を軸方向に圧縮しないように設定して前記カラーに固定するワッシャ組付工程と、前記ボルトにて固定する際に前記頭部にて前記ワッシャを介して前記第２弾性部材を軸方向に圧縮し且つ前記第２弾性部材及び前記固定部を介して前記第１弾性部材を軸方向に圧縮して前記モータハウジングを支持固定する固定工程とを備えたことを特徴とするモータ固定方法。
【００５６】
このようにすると、ワッシャ組付工程が行われ固定工程が行われていないモータハウジングには、第２弾性部材が圧縮されずに配設される。よって、ワッシャ組付工程後且つ固定工程前の状態で、モータハウジング側の部材、即ちモータを、例えば、保存管理したり搬送しても、第２弾性部材が損傷することが低減される。しかも、固定工程前では、ワッシャが第２弾性部材から押圧されないので、該ワッシャを容易に固定することができる。
【００５７】
【発明の効果】
以上詳述したように、請求項１〜８に記載の発明によれば、部品点数の増大を抑制しながら、容易に組み付けることができるモータ取付構造を提供することができる。
【００５８】
又、請求項９に記載の発明によれば、モータハウジングからモータ取付面への振動の伝達を低減することができるモータ取付構造を提供することができる。
【図面の簡単な説明】
【図１】本実施の形態におけるモータ取付構造の要部断面図。
【図２】本実施の形態におけるモータ取付構造を説明するための説明図。
【図３】本実施の形態におけるモータ取付構造の一部分解斜視図。
【図４】別例におけるモータ取付構造の要部断面図。
【図５】別例におけるモータ取付構造を説明するための説明図。
【図６】別例におけるモータ取付構造の一部分解斜視図。
【符号の説明】
１ａ…モータ取付面、１ｂ…出力軸用孔、３…モータハウジング、４…出力軸、６ｂ…固定部、６ｃ…固定孔（孔）、１２，２１…第１弾性部材、１３…カラー、１３ａ…鍔部、１４，２２…第２弾性部材、１４ｂ…フック部、１５…ワッシャ、１６…ボルト、１６ａ…軸部、１６ｂ…頭部、２１ｂ…延設部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor mounting structure for fixing a motor housing of a motor to a motor mounting surface, and is particularly suitable as a motor mounting structure in an electric power steering apparatus.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an electric power steering device, there is one in which a motor (motor housing) is fixed to a motor mounting surface provided on a vehicle column in order to assist the steering operation force with the driving force of the motor. As such a motor fixing structure, there is a structure (so-called floating support structure) in which a motor housing is fixed to a motor mounting surface via a rubber vibration-proof member (elastic member) (see, for example, Patent Document 1). .
[0003]
In this motor mounting structure, a fixing portion extending outward in the radial direction (a direction orthogonal to the mounting direction) is formed in the motor housing, and a fixing portion that passes through the fixing portion and is screwed into the motor mounting surface. An elastic member is provided between the two. Specifically, the elastic member includes a cylindrical portion, a flange portion that extends radially outward from one end of the cylindrical portion, and a flange portion that extends radially outward from the other end of the cylindrical portion. And a cylinder part is interposed between the inner periphery of the hole of a fixing | fixed part, and the axial part of a volt | bolt, and absorbs the impact of radial direction. Also, the flange on one end side is interposed between the motor mounting surface and the surface on the motor mounting surface side of the fixed portion to absorb the impact on the axially adjacent side (the side where the motor housing is close to the motor mounting surface). . Also, the flange on the other end is interposed between the head of the bolt and the head-side surface of the fixed part to absorb the impact on the axially separated side (the side where the motor housing is separated from the motor mounting surface). To do. Therefore, the vibration of the motor housing due to the driving of the motor is transmitted to the motor mounting surface side is reduced by the action of each part of the elastic member. As a result, transmission of vibration to the steering is reduced.
[0004]
[Patent Document 1]
JP 2000-350397 A
[0005]
[Problems to be solved by the invention]
However, in the motor mounting structure as described above, since the flanges are formed at both ends of the elastic member, when assembling the elastic member to the fixed part, the hole of the fixed part is bent while greatly bending one of the flanges radially inward. Therefore, it was difficult to assemble it (especially difficult to assemble automatically). In addition, when it is set as the structure which makes it easy to bend (it is thin) and to make it easy to insert the collar part of an elastic member, there exists a bad effect of making the support of the whole motor unstable.
[0006]
Moreover, if the elastic member is divided into two at the middle part of the cylinder part and the two members are assembled to both of the holes of the fixed part, there is no need to bend the collar part and the assembling work is easy. However, in this case, there is a problem that the number of parts increases (doubles for each bolt) and the number of assembling steps increases.
[0007]
The present invention has been made to solve the above problems, and an object thereof is to provide a motor mounting structure that can be easily assembled while suppressing an increase in the number of parts.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a motor mounting structure in which a motor housing arranged in a vertical direction is fixed with a bolt to a motor mounting surface in which an output shaft hole for accommodating an output shaft is formed. An annular first elastic member is disposed between the motor mounting surface and the motor housing and is disposed outside the output shaft hole to absorb an impact on the axially adjacent side, and the motor housing Is formed with a fixing portion extending radially outward of the first elastic member, between the fixing portion and the head of the bolt, and between the fixing portion and the shaft portion of the bolt. A second elastic member for interposing an axially separated side shock and an impact in the radial direction is interposed.
[0009]
According to a second aspect of the present invention, in the motor mounting structure according to the first aspect, the first elastic member is provided so as to absorb the impact in the radial direction between the motor mounting surface and the motor housing.
[0010]
According to a third aspect of the present invention, in the motor mounting structure according to the second aspect, the first elastic member extends radially outward and engages with the bolt in the radial direction to absorb the impact in the radial direction. An extending portion for the purpose is integrally formed.
[0011]
According to a fourth aspect of the present invention, in the motor mounting structure according to any one of the first to third aspects, the motor mounting surface is disposed between the second elastic member and the shaft portion of the bolt. A collar is provided for defining a distance between the bolt and the head.
[0012]
According to a fifth aspect of the present invention, in the motor mounting structure according to the fourth aspect, a collar portion that extends radially outward is formed at an end portion of the collar on the motor mounting surface side. According to a sixth aspect of the present invention, in the motor mounting structure according to the fourth or fifth aspect, a washer is disposed on the outer periphery of the head side end of the collar.
[0013]
The invention according to claim 7 is the motor mounting structure according to claim 6, wherein the washer does not compress the second elastic member in the axial direction in a state where the motor housing is not fixed by the bolt. And fixed to the color.
[0014]
The invention according to claim 8 is the motor mounting structure according to any one of claims 5 to 7, wherein an outer diameter of the flange portion is set to be equal to or smaller than an inner diameter of the hole of the fixing portion, and the second A hook portion that protrudes radially outward from the inner diameter of the hole of the fixed portion is formed at the end of the elastic member on the motor mounting surface side.
[0015]
The invention according to claim 9 is a motor mounting structure in which a motor housing arranged in a vertical direction is fixed with bolts to a motor mounting surface in which an output shaft hole for accommodating an output shaft is formed. A first elastic member is disposed between the motor mounting surface and the motor housing and is disposed outside the output shaft hole so as to absorb an impact on the axial proximity side and absorb a radial impact. The motor housing is formed with a fixed portion extending radially outward of the first elastic member, between the fixed portion and the head of the bolt, and between the fixed portion and the shaft portion of the bolt. In between, a second elastic member for absorbing an axially separated side impact and a radial direction impact was interposed.
[0016]
(Function)
According to the first aspect of the present invention, the motor housing is configured such that the first elastic member absorbs an impact on the axially adjacent side with respect to the motor mounting surface, and the second elastic member is axial. It fixes so that the impact to a separation side and radial direction may be absorbed. And since the 1st elastic member is cyclic | annular arrange | positioned on the outer side of the hole for output shafts between a motor attachment surface and a motor housing, the number of parts becomes one. Moreover, since the second elastic member is arranged on the outer side in the radial direction of the first elastic member and is not intended to absorb the impact toward the axially adjacent side, the fixed portion is formed from the anti-motor mounting surface side as a simple shape. Can be easily assembled. Therefore, the motor housing can be easily assembled while suppressing an increase in the number of parts. And since the 1st elastic member is cyclic | annular, the penetration | invasion of foreign materials, such as dust, in the hole for output shafts in which an output shaft is accommodated is prevented.
[0017]
According to the second aspect of the invention, the impact in the radial direction between the motor mounting surface and the motor housing is absorbed by the first elastic member in addition to the second elastic member. As described above, since the radial impact is absorbed by the first and second elastic members at different positions in the radial direction, transmission of vibration from the motor housing to the motor mounting surface can be further reduced.
[0018]
According to the third aspect of the present invention, the first elastic member is integrally formed with an extending portion that extends radially outward and engages with the bolt in the radial direction to absorb the impact in the radial direction. Therefore, transmission of vibration from the motor housing to the motor mounting surface can be further reduced while suppressing an increase in the number of parts.
[0019]
According to the invention described in claim 4, since the collar for defining the distance between the motor mounting surface and the head portion of the bolt is disposed between the second elastic member and the shaft portion of the bolt. The distance between the motor mounting surface and the bolt head is constant. Therefore, it is possible to prevent the first and second elastic members from being excessively compressed and damaged, and to easily make the vibration isolation effect constant.
[0020]
According to the fifth aspect of the present invention, since the collar portion extending on the outer side in the radial direction is formed at the end portion of the collar on the motor mounting surface side, the contact area between the collar and the motor mounting surface is increased. The pressure per area is reduced, and damage to the collar and motor mounting surface is prevented.
[0021]
According to the sixth aspect of the present invention, since the washer is disposed on the outer periphery of the head side end portion of the collar, when the bolt is screwed to the motor mounting surface, It is prevented that the portion twists while pressing the second elastic member. Therefore, it is possible to prevent the second elastic member from being damaged and the vibration-proof effect from being lowered by the second elastic member.
[0022]
According to the seventh aspect of the invention, the washer is fixed to the collar so as not to compress the second elastic member in the axial direction in a state where the motor housing is not fixed by the bolt. Therefore, even if the member on the motor housing side, that is, the motor, is stored and transported, for example, in a state before the collar and washer are fixed and fixed with bolts, the second elastic member is less damaged. Is done. In addition, since the washer is not pressed from the second elastic member before the motor housing is fixed with the bolt, the washer can be easily fixed to the collar.
[0023]
According to the invention described in claim 8, the outer diameter of the collar flange is set to be equal to or smaller than the inner diameter of the hole of the fixed portion, and the end of the second elastic member on the motor mounting surface side has the hole of the fixed portion. A hook portion protruding outward in the radial direction from the inner diameter is formed. In this way, both the collar and the second elastic member (for example, assembled in advance) can be easily inserted from one side into the hole of the fixing portion. In addition, the second elastic member is prevented from coming off to the side opposite to the motor mounting surface at the hook portion of the second elastic member, that is, temporarily fixed.
[0024]
According to the ninth aspect of the present invention, the radial impact between the motor mounting surface and the motor housing is absorbed by the first and second elastic members at different positions in the radial direction. Therefore, transmission of vibration from the motor housing to the motor mounting surface can be reduced.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in a motor mounting structure in an electric power steering apparatus will be described with reference to FIGS. As shown in FIG. 1, a motor mounting surface 1a is formed on a column member 1 constituting a vehicle column, and a motor housing 3 of a motor 2 is fixed to the motor mounting surface 1a.
[0026]
The motor mounting surface 1a (column member 1) is formed with an output shaft hole 1b and a female screw portion 1c for receiving an output shaft 4 connected to a steering (not shown). The column member 1 of the present embodiment is made of an aluminum alloy.
[0027]
The motor 2 includes a yoke 5 formed in a substantially bottomed cylindrical shape and the motor housing 3 composed of an end housing 6 covering the opening of the yoke 5, a magnet 7 fixed to the inner peripheral surface of the yoke 5, A rotor 8 or the like that is rotatably held in the motor housing 3 is provided.
[0028]
A bulge 6a (see FIG. 3) that bulges in a cylindrical shape is formed on one end surface of the end housing 6 opposite to the bottom of the yoke 5 (left side in FIG. 1), and the inside of the bulge 6a One end side of the rotating shaft 8 a of the rotor 8 is rotatably supported on the circumferential side via a bearing 9. The rotating shaft 8a is connected to the output shaft 4. Further, the bulging portion 6a is set so that its outer diameter is slightly smaller than the inner diameter of the output shaft hole 1b (that is, it can be loosely fitted into the output shaft hole 1b). A fixed portion 6b extending outward in the radial direction is formed on the outer periphery of the end housing 6. The fixing portion 6b is formed with a fixing hole 6c as a hole penetrating in the axial direction (left and right direction in FIG. 1). In the present embodiment, two fixing portions 6b are formed at equiangular (180 degrees) intervals. The cross section shown in FIG. 1 is not a cross section of one plane but a cross section of one fixing portion 6b (on the lower side in FIG. 1) and a cross section in the vicinity of the power supply line 11 from the outside. It is shown (upper side in FIG. 1).
[0029]
As shown in FIG. 2, an annular first elastic member 12 (see FIG. 3) is disposed on the end surface of the end housing 6 on the motor mounting surface 1a side so as to be fitted on the bulging portion 6a. . In addition, the 1st elastic member 12 of this Embodiment consists of rubber materials.
[0030]
In addition, a collar 13, a second elastic member 14, and a washer 15 are disposed on the fixed portion 6b.
Specifically, the collar 13 is formed in a substantially cylindrical shape whose outer diameter is smaller than the inner diameter of the fixed hole 6c, and its axial length is longer than the axial length of the fixed hole 6c. Further, a collar 13a extending outward in the radial direction is formed at the end (one end) of the collar 13 on the motor mounting surface 1a side. The flange 13a has an outer diameter set to be substantially the same as the inner diameter of the fixing hole 6c (can be fitted inside). The collar 13 of the present embodiment is made of steel or the like.
[0031]
The second elastic member 14 is made of a rubber material. The second elastic member 14 can be fitted onto the collar 13 and can be fitted into the fixing hole 6c, and radially outward from one end (the left end in FIGS. 1 and 2) of the tubular portion 14a. It has a protruding hook portion 14b and an elastic flange portion 14c extending radially outward from the other end (right end in FIGS. 1 and 2) of the cylindrical portion 14a. In the present embodiment, the cylindrical portion 14a and the elastic flange portion 14c constitute a portion between them. The hook portion 14b is formed so that its maximum outer diameter is slightly larger than the inner diameter of the fixing hole 6c. Further, the outer diameter of the hook portion 14b decreases toward the one end side, so that the second elastic member 14 can be easily inserted into the fixing hole 6c from one end side (the other end side of the second elastic member 14 is connected to the other end side). It is set so that it can be bent and inserted (by simply energizing).
[0032]
The washer 15 is formed in a disk shape, has an outer diameter set to be the same as the outer diameter of the elastic flange portion 14c, and has an inner diameter set so that it can be externally fitted (press-fit) to the other end of the collar 13. . The collar 13, the second elastic member 14, and the washer 15 are assembled in advance by fitting the second elastic member 14 to the collar 13 in advance, and further fitting the washer 15 to the other end of the collar 13 (press-fit). (Washer assembly process). Then, the members (the collar 13, the second elastic member 14, and the washer 15) are assembled by being inserted into the fixing hole 6c from one end side thereof. In this state (see FIG. 2), the hook portion 14b is engaged with one end surface of the fixed portion 6b, and the second elastic member 14 is prevented from coming off to the other end side. The length of each member in the axial direction is set so that the elastic flange portion 14c of the second elastic member 14 is not compressed in the axial direction in this state (see FIG. 2). In this state, the axial thickness of the first elastic member 12 is set so as to protrude from the collar 13 (the flange portion 13a) to one end side (motor mounting surface 1a side).
[0033]
The motor housing 3 passes through the fixing hole 6c (collar 13) and is bolted to the female threaded portion 1c of the motor mounting surface 1a with a bolt 16 perpendicular to the motor mounting surface 1a. It fixes so that it may be arrange | positioned (fixing process).
[0034]
Specifically, the bolt 16 includes a shaft portion 16a on which a male screw is formed, and a head portion 16b formed on an end portion thereof (right end portion in FIGS. 1 and 2). Then, when the shaft portion 16a is screwed into the female screw portion 1c, the head portion 16b presses the other end portion of the collar 13 and the washer 15, and the elastic collar portion 14c of the second elastic member 14 via the washer 15. Is compressed in the axial direction, and the first elastic member 12 is compressed in the axial direction via the elastic flange portion 14c, the fixed portion 6b, and the like. When the collar portion 13a of the collar 13 comes into contact with the motor mounting surface 1a, the collar 13 restricts further movement of the bolt 16 (movement of the head portion 16b toward the motor mounting surface 1a).
[0035]
Thereby, the motor housing 3 (motor 2) is supported and fixed to the motor mounting surface 1a. The first elastic member 12 is interposed between the motor mounting surface 1 a and the motor housing 3 (end housing 6), and is on the axially adjacent side (motor relative to the motor mounting surface 1 a) based on vibration when the motor 2 is driven. Absorbs the impact on the side close to the housing 3). The elastic flange portion 14c of the second elastic member 14 is interposed between the fixed portion 6b and the head portion 16b of the bolt 16, and is separated on the axially separated side (on the motor mounting surface 1a) based on vibration during driving of the motor 2. The impact on the side where the motor housing 3 is separated is absorbed. The cylindrical portion 14 a of the second elastic member 14 is interposed between the inner peripheral surface of the fixing hole 6 c and the shaft portion 16 a (specifically, the collar 13) of the bolt 16, and has a diameter based on vibration when the motor 2 is driven. Absorbs direction shocks. Further, in the present embodiment, the first elastic member 12 is sandwiched between the motor mounting surface 1 a and the motor housing 3 (end housing 6), and the inner peripheral surface thereof is the bulging portion 6 a of the end housing 6. By contacting the outer peripheral surface, the radial impact is also absorbed.
[0036]
Therefore, the vibration of the motor housing 3 due to the driving of the motor 2 is attenuated and the transmission of the vibration to the motor mounting surface 1a side is reduced. As a result, transmission of vibration to the steering is reduced.
[0037]
Next, characteristic effects of the above embodiment will be described below.
(1) The first elastic member 12 for absorbing the impact of the motor mounting surface 1a and the motor housing 3 toward the axially adjacent side is formed between the motor mounting surface 1a and the motor housing 3 with the output shaft hole 1b. Since it is a ring arranged outside, the number of parts is one. Moreover, since the second elastic member 14 for absorbing the shock in the axially separated side and the radial direction is not for absorbing the shock in the axially adjacent side, it is simple (a hook portion is formed at one end). As a shape, it can be easily assembled to the fixing portion 6b (inserted into the fixing hole 6c) from the non-motor mounting surface side (right side in FIG. 1). Therefore, the motor housing 3 can be easily assembled while suppressing an increase in the number of parts. And since the 1st elastic member 12 is cyclic | annular, the penetration | invasion of foreign materials, such as dust, in the hole 1b for output shafts is prevented.
[0038]
(2) The first elastic member 12 is sandwiched between the motor mounting surface 1a and the motor housing 3 (end housing 6), and the inner peripheral surface thereof is in contact with the outer peripheral surface of the bulging portion 6a of the end housing 6. As a result, the impact in the radial direction is absorbed. As described above, since the radial impact is absorbed by the first and second elastic members 12 and 14 at different positions in the radial direction, the motor housing 3 to the motor mounting surface 1a (compared to the prior art). The transmission of vibration can be further reduced. Further, the motor housing 3 can be stably supported and fixed on the motor mounting surface 1a. In other words, the member on the motor housing 3 side, that is, the motor 2 is supported by being tilted by its own weight or the like.
[0039]
(3) Since a collar 13 is provided between the second elastic member 14 and the shaft portion 16a of the bolt 16 to define the distance between the motor mounting surface 1a and the head portion 16b of the bolt 16, the motor The distance between the mounting surface 1a and the head 16b of the bolt 16 is constant. Therefore, it is possible to prevent the first and second elastic members 12 and 14 from being excessively compressed and damaged, and to easily make the vibration isolation effect constant.
[0040]
(4) Since a collar portion 13a extending radially outward is formed at one end portion (end portion on the motor mounting surface 1a side) of the collar 13, the contact area between the collar 13 and the motor mounting surface 1a is increased. The pressure per unit area is reduced, and damage to the collar 13 and the motor mounting surface 1a is prevented.
[0041]
(5) Since the washer 15 is disposed on the outer periphery of the other end portion of the collar 13, the bolt 16 (shaft portion 16a) is screwed into the motor mounting surface 1a (female screw portion 1c). The head portion 16b abuts against the washer 15, and the head portion 16b is prevented from being twisted while being in pressure contact with the elastic flange portion 14c of the second elastic member 14. Therefore, it can prevent that the 2nd elastic member 14 will be damaged, and the vibration isolating effect of the 2nd elastic member 14 will fall.
[0042]
(6) The washer 15 is set so as not to compress the elastic collar portion 14c of the second elastic member 14 in the axial direction when the motor housing 3 is not fixed by the bolt 16 (before the fixing process). It fixes to the other end part of (a washer assembly | attachment process). Therefore, even if the member on the motor housing 3 side, that is, the motor 2 is stored and transported, for example, in a state before the motor housing 3 is fixed with the bolt 16, the second elastic member 14 is damaged. Is reduced. In addition, since the washer 15 is not pressed from the second elastic member 14 before the motor housing 3 is fixed by the bolt 16, the washer 15 can be easily fixed to the collar 13.
[0043]
(7) The outer diameter of the collar portion 13a of the collar 13 is set to be substantially the same as the inner diameter of the fixing hole 6c (can be fitted inside), and the one end portion of the second elastic member 14 has a radial direction from the inner diameter of the fixing hole 6c. A hook portion 14b protruding outward is formed. Therefore, both the collar 13 and the second elastic member 14 (assembled in advance) can be easily inserted into the fixing hole 6c from one end side thereof. In addition, the hook portion 14b of the second elastic member 14 is engaged with the one end surface of the fixed portion 6b, so that the second elastic member 14 is prevented from being pulled out to the other end side (on the side opposite to the motor mounting surface). That is, temporary fixing is performed. Therefore, storage management and transportation in that state are facilitated.
[0044]
The above embodiment may be modified as follows.
The first elastic member 12 of the above embodiment only needs to absorb at least the impact on the axially adjacent side, and the second elastic member 14 absorbs the impact on the axially separated side and is in the radial direction For example, it may be changed as shown in FIGS. 4 to 6.
[0045]
As shown in FIGS. 4 to 6, the first elastic member 21 includes an annular portion 21 a formed in an annular shape similar to the first elastic member 12 of the above embodiment, and extends radially outward from the annular portion 21 a. It has a thin extending portion 21b that engages with the bolt 16 in the radial direction (specifically, the collar 13 is inserted and absorbs the impact in the radial direction). The second elastic member 22 has a shape in which one end side of the second elastic member 14 of the above embodiment is deleted (a part of the hook portion 14b and the cylindrical portion 14a is not formed), and the second elastic member 22 of the above embodiment It has the cylinder part 22a shorter than the cylinder part 14a, and the elastic collar part 22b similar to the elastic collar part 14c of the said embodiment.
[0046]
In this example, the first elastic member 21, the collar 13, the second elastic member 22, and the washer 15 are assembled in this order with respect to the fixed portion 6b of the motor housing 3 (end housing 6). In this state (see FIG. 5), the collar portion 13 a of the collar 13 is engaged with the extending portion 21 b in the axial direction, and the washer 15 fixed to the other end portion of the collar 13 is elastic of the second elastic member 22. By engaging the flange portion 22b in the axial direction, each member (second elastic member 22 or the like) is prevented from falling off (detaching). The length of each member in the axial direction is set so that the elastic flange portion 22b of the second elastic member 22 is not compressed in the axial direction in this state (see FIG. 5). In this state, the annular portion 21a of the first elastic member 21 is set to have an axial thickness so as to protrude from the collar 13 (the flange portion 13a) to one end side (motor mounting surface 1a side). The motor housing 3 is fixed to the motor mounting surface 1a with a bolt 16 that passes through the fixing hole 6c (collar 13) and is screwed into the female screw portion 1c of the motor mounting surface 1a as in the above embodiment. Is done.
[0047]
If it does in this way, the extension part 21b of the 1st elastic member 21 will engage with the volt | bolt 16 in radial direction (specifically, the collar 13 is inserted and inserted), and the said radial impact is further absorbed. . Therefore, transmission of vibration from the motor housing 3 to the motor mounting surface 1a can be further reduced while suppressing an increase in the number of parts.
[0048]
In the above embodiment, the first elastic member 12 absorbs a shock in the radial direction because its inner peripheral surface is in contact with the outer peripheral surface of the bulging portion 6a of the end housing 6, etc. You may make it not absorb the impact of a direction. The phrase “not absorbing the impact in the radial direction” means that it does not absorb any more than the extent that the impact in the radial direction is absorbed by the friction in the axial direction. In other words, the first elastic member 12 may not be in contact with the end housing 6 in the radial direction. Even if it does in this way, the effect similar to the effect (1) of the said embodiment and (3)-(7) can be acquired.
[0049]
In the above embodiment, the collar 13 is disposed between the second elastic member 14 and the shaft portion 16a of the bolt 16, but the collar 13 may be omitted. In this case, it is necessary to change the diameter of the fixing hole 6c and the cylindrical portion 14a of the second elastic member 14. Even if it does in this way, the effect similar to the effect (1) of the said embodiment and (2) can be acquired.
[0050]
In the above embodiment, the collar 13 is formed with the collar 13a extending outward in the radial direction at one end of the collar 13 (the end on the motor mounting surface 1a side). However, the collar 13 may not be formed with the collar 13a. . Even if it does in this way, the effect similar to the effect (1)-(3) of the said embodiment, (5), (6) can be acquired.
[0051]
In the above embodiment, the washer 15 is disposed on the outer periphery of the other end of the collar 13, but the washer 15 may be omitted. In this case, it is necessary to change the axial lengths of the collar 13 and the second elastic member 14 (elastic flange portion 14c). Even if it does in this way, the effect similar to the effect (1)-(4) of the said embodiment and (7) can be acquired.
[0052]
In the above embodiment, the outer diameter of the collar portion 13a of the collar 13 is set to be substantially the same as the inner diameter of the fixing hole 6c (can be fitted inside), but the outer diameter of the collar portion 13a is set to be equal to that of the fixing hole 6c. You may set larger than an internal diameter. In this case, the collar is assembled to the fixing portion 6b (fixing hole 6c) by moving it from the motor mounting surface 1a side (for example, the second elastic member 14, the collar and the washer 15 in this order with respect to the fixing portion 6b. Need to be assembled). Even if it does in this way, the effect similar to the effect (1)-(6) of the said embodiment can be acquired.
[0053]
In the above embodiment, the first elastic member 12 is annular, but may be a plurality of first elastic members that are provided at intervals on the outer periphery of the bulging portion 6a. Further, the hook portion 14b of the second elastic member 14 is changed to an elastic flange portion that is interposed between the motor mounting surface 1a and the motor housing 3 (fixed portion 6b) and absorbs the impact on the axially adjacent side. Also good. In this case, it is necessary to bend and attach the elastic collar part or to divide the second elastic member into two. Even if it does in this way, the effect similar to the effect (2) of the said embodiment can be acquired.
[0054]
In the embodiment described above, the motor mounting structure in the electric power steering apparatus is embodied, but the motor mounting structure in another apparatus having the same mounting structure may be embodied.
[0055]
The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) A motor fixing method for fixing the motor housing to the motor mounting surface in the motor mounting structure according to claim 6, wherein the washer is not fixed to the bolt by the bolt. A washer assembling step for setting the second elastic member so as not to be compressed in the axial direction and fixing the second elastic member to the collar; and, when fixing with the bolt, the second elastic member is attached to the head via the washer. A motor fixing comprising: a fixing step of compressing in the axial direction and compressing the first elastic member in the axial direction through the second elastic member and the fixing portion to support and fix the motor housing. Method.
[0056]
If it does in this way, a 2nd elastic member will be arrange | positioned without compression in the motor housing in which the washer assembly | attachment process was performed but the fixing process was not performed. Therefore, even if the member on the motor housing side, i.e., the motor, is stored and transported, for example, after the washer assembling process and before the fixing process, the damage to the second elastic member is reduced. In addition, since the washer is not pressed from the second elastic member before the fixing step, the washer can be easily fixed.
[0057]
【The invention's effect】
As described above in detail, according to the first to eighth aspects of the invention, it is possible to provide a motor mounting structure that can be easily assembled while suppressing an increase in the number of components.
[0058]
According to the ninth aspect of the present invention, it is possible to provide a motor mounting structure that can reduce the transmission of vibration from the motor housing to the motor mounting surface.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a motor mounting structure in the present embodiment.
FIG. 2 is an explanatory diagram for explaining a motor mounting structure in the present embodiment.
FIG. 3 is a partially exploded perspective view of a motor mounting structure in the present embodiment.
FIG. 4 is a cross-sectional view of a main part of a motor mounting structure in another example.
FIG. 5 is an explanatory diagram for explaining a motor mounting structure in another example.
FIG. 6 is a partially exploded perspective view of a motor mounting structure in another example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a ... Motor mounting surface, 1b ... Output shaft hole, 3 ... Motor housing, 4 ... Output shaft, 6b ... Fixed part, 6c ... Fixed hole (hole), 12, 21 ... First elastic member, 13 ... Collar, 13a ... collar part, 14, 22 ... 2nd elastic member, 14b ... hook part, 15 ... washer, 16 ... bolt, 16a ... shaft part, 16b ... head part, 21b ... extension part.

Claims

A motor mounting structure in which a motor housing arranged in a vertical direction is fixed with bolts to a motor mounting surface in which an output shaft hole for accommodating an output shaft is formed,
Between the motor mounting surface and the motor housing, an annular first elastic member is disposed outside the output shaft hole and absorbs an impact on the axial proximity side,
The motor housing is formed with a fixing portion extending radially outward of the first elastic member,
Between the fixed part and the head part of the bolt and between the fixed part and the shaft part of the bolt, there is a portion between the two parts that absorbs the impact on the axially separated side. A motor mounting structure characterized in that a second elastic member for absorbing a radial impact is interposed.

In the motor mounting structure according to claim 1,
The motor mounting structure according to claim 1, wherein the first elastic member is provided so as to absorb a shock in a radial direction between the motor mounting surface and the motor housing.

In the motor mounting structure according to claim 2,
A motor mounting structure in which the first elastic member is integrally formed with an extending portion that extends radially outward and engages with the bolt in the radial direction to absorb the impact in the radial direction.

The motor mounting structure according to any one of claims 1 to 3,
A motor mounting characterized in that a collar for defining a distance between the motor mounting surface and the head of the bolt is disposed between the second elastic member and the shaft portion of the bolt. Construction.

In the motor mounting structure according to claim 4,
A motor mounting structure, wherein a collar portion extending radially outward is formed at an end of the collar on the motor mounting surface side.

In the motor mounting structure according to claim 4 or 5,
A motor mounting structure, wherein a washer is disposed on an outer periphery of an end of the collar on the head side.

In the motor mounting structure according to claim 6,
The motor mounting structure, wherein the washer is fixed to the collar so as not to compress the second elastic member in an axial direction in a state where the motor housing is not fixed by the bolt.

The motor mounting structure according to any one of claims 5 to 7,
The outer diameter of the flange portion is set to be equal to or smaller than the inner diameter of the hole of the fixed portion,
A motor mounting structure characterized in that a hook portion that protrudes radially outward from the inner diameter of the hole of the fixed portion is formed at an end of the second elastic member on the motor mounting surface side.

A motor mounting structure in which a motor housing arranged in a vertical direction is fixed with bolts to a motor mounting surface in which an output shaft hole for accommodating an output shaft is formed,
Between the motor mounting surface and the motor housing, a first elastic member is disposed outside the output shaft hole and absorbs an impact on the axial proximity side and absorbs a radial impact. ,
The motor housing is formed with a fixing portion extending radially outward of the first elastic member,
Between the fixing part and the head part of the bolt and between the fixing part and the shaft part of the bolt, the second part for absorbing the shock in the axially separated side and absorbing the radial shock. A motor mounting structure characterized in that an elastic member is interposed.