JP4040158B2

JP4040158B2 - Fixing method of compressor fixing bolt and outdoor unit of air conditioner

Info

Publication number: JP4040158B2
Application number: JP01124198A
Authority: JP
Inventors: 穣砂川
Original assignee: Toshiba Carrier Corp
Current assignee: Toshiba Carrier Corp
Priority date: 1998-01-23
Filing date: 1998-01-23
Publication date: 2008-01-30
Anticipated expiration: 2018-01-23
Also published as: JPH11210729A

Description

【０００１】
【発明の属する技術分野】
本発明は、圧縮機を取り付けるために用いる圧縮機固定用ボルトの固定方法及び空気調和機の室外機に関する。
【０００２】
【従来の技術】
周知の通り、空気調和機の室外機には冷凍サイクルを構成する圧縮機及び室外熱交換器等と、この室外熱交換器での熱交換を促進するよう設けられた室外ファンなどが収納されている。また、これらの圧縮機、室外熱交換器、室外ファンなどは、室外機の底面を形成する底板にそれぞれ載置されている。そして、圧縮機の底板への載置については、圧縮機の下部に設けられた固定脚の固定用孔を防振ゴムなどを介して底板に立設した複数の固定用ボルトに挿入した後、固定用ボルトにナットを嵌めて固定している。これにより輸送時の振動や、空気調和機を運転した時の圧縮機の振動による圧縮機自身への悪影響や圧縮機につながる冷媒配管の破損を防止している。
【０００３】
こうした圧縮機を室外機の底板に固定するための固定用ボルトは、固定用ボル卜に形成されたつば部を底板にスポット溶接することによって強固に取付けられていた。しかしながら、スポット溶接では、水平となっている面に溶接跡が残ることになるので、その溶接部分に水分が溜まるなどして錆が生じやすく、かつ面倒な溶接工程が必要になるという問題があった。
【０００４】
そこで、このような問題を解決するために種々の構成が提案されており、以下、これらの従来の技術を図面を用いて説明する。先ず、特開昭５６−８６２１８号公報には、図１０に第１の従来技術として示すように絞り丸孔１が形成された底板２と、絞り丸孔１を貫通する角形状根元部分３を有する圧縮機取付用ボルト４とを用い、絞り丸孔１に挿入した圧縮機取付用ボルト４の角形状根元部分３を孔５が形成された上型６と下型７によって塑性変形させかしめることにより固定する方法が記載されている。この方法によれば、固定部分から錆を生じる可能性が低く、製造も簡単になるという利点がある。ところが、かしめによる固定は、金属材料の変形による圧着であるため、溶接並みの機械的強度を得ることが難しく、かつ個々のかしめ毎に強度にバラツキが生じ、安定した強度の製品を得にくいという問題があった。
【０００５】
また一方では、圧縮機のような重量物をゴムなどの防振材を介して固定した場合、室外機等の底板と固定用ボルトのかしめ部分は、固定用ボルトの軸方向に作用する外力と、固定用ボルトにナットを取付ける際の固定用ボルトを中心とし回転方向に作用する外力の両方の力を受ける。このため、かしめ部分は両方の力に対して十分に絶えるような強度を持つ必要がある。
【０００６】
しかしなから、上記の特開昭５６−８６２１８号公報のものでは、絞り丸孔１と、固定用ボルトである圧縮機取付用ボルト４の例えば断面形状が六角形となっている角形状根元部分３の間の隙間が多く、かしめの際に多くの肉が隙間に逃げてしまう。この結果、回転方向及び軸方向に作用する力のいずれに対してもかしめ部分は十分な強度を有するものではない。
【０００７】
次に、特公昭５６−７４４６号公報には図１１及び図１２に第２の従来技術として示すように、例えば六角形の角孔８が形成された金属板９と、角孔８を貫通するこれと同様の断面形状が六角形の角軸１０を根元部分に有し先端部分に螺軸１１を備える螺子１２とを用い、角孔８に挿入した螺子１２の角軸１０を超硬合金で形成された出口部１３を有する中空パンチ体１４と台盤１５によって塑性変形させかしめることにより固定する方法が記載されている。なお、１６は螺子１２の頭部であり、１７は中空パンチ体１４に形成された孔であり、１８は中空パンチ体１４の上面と金属板９との間に挿入された弾性体等でなる緩衝材であり、２０はノックアウトピンである。
【０００８】
しかしながら、金属板９には角孔８が形成されており、また螺子１２には根元部分に角軸１０を備えるものであるから、角孔８に角軸１０を挿入する場合、挿入前に角形状をなす両者の角を合わせる必要があり、機械によって簡単に自動挿入することができず、手作業を必要とすることになり極めて製造性が悪くなってしまい、自動挿入を行おうとした場合には使用する機械の構成及び制御が非常に複雑なものとなってしまう。さらに、角孔８と角軸１０との組み合わせであるため回転方向の力に対して高い強度を示すが、かしめ部分である角軸１０の六角形の辺部分ではかしめにより塑性変形する肉の量が少なく、金属板９を押さえる面積が小さくなり、螺子１２の軸方向に作用する外力に対する強度が低いものとなってしまう。
【０００９】
次に、特開平８−１５９１３２号公報には図１３に第３の従来技術として示すように、ボルト２１はねじ軸部２２の基端が変形軸部２３と環状溝２４を有しており、このボルト２１を変形軸部２３までプレート２５に形成された貫通孔２６に挿入した後、ボルト２１の頭部２７を受け台２８に載せるようにして直立させ、ねじ軸部２２側からかしめ具２９を挿入し押圧して変形軸部２３を変形させ、塑性変形部２３ａを形成すると共にプレート２５の貫通孔２６部分を環状溝２４に食い込ませるように変形させてかしめ固定する方法が記載されている。
【００１０】
この方法は、かしめ具２９で押圧して変形軸部２３を塑性変形させた肉で塑性変形部２３ａを形成すると共にプレート２５を環状溝２４に食い込ませ、プレート２５面と塑性変形部２３ａの面とを平坦化することでボルト２１が固定される図示しない支持パネルの平坦面との密着性を向上させ、ボルト２１を強固に固定しようとするものである。このため、この方法では、ボルト２１の軸に対して垂直な面の方向の固定強度をほとんど必要としない。
【００１１】
しかしながら、圧縮機を固定するために用いる固定用ボルトにおいては、圧縮機に設けられた固定脚と固定用ボルトとの間に防振ゴムなどを介在させ、通常時には固定脚が固定用ボルトに力を加えることはないが、輸送時の振動や落下では極めて大きな力が一気に固定用ボルトに加わる。すなわち、圧縮機の固定用ボルトでは、その軸に対して垂直な面の方向にこじるような大きな力が加わる可能性があり、この方向の強度を上げておく必要もある。
【００１２】
ところが、上記の特開平８−１５９１３２号公報のものでは、ボルト２１のプレート２５へのかしめ固定を、ボルト２１の変形軸部２３を塑性変形させ塑性変形部２３ａを形成することでプレート２５の貫通孔２６部分を環状溝２４に食い込ませるように変形させて行っているため、プレート２５の変形部分での変形量が大きく、かつこの部分での肉厚も減少していることから、ボルト２１を軸に垂直な面の方向にこじるような力に対しての強度が低く、このようなかしめ固定する方法をそのまま圧縮機の固定用ボルトに適用することができない。
【００１３】
【発明が解決しようとする課題】
上記のような状況に鑑みて本発明はなされたもので、その目的とするところは圧縮機固定用ボルトを圧縮機収納部の底板に、ボルト先端側部分に取り付けられる圧縮機が輸送中等に動き、圧縮機固定用ボルトの軸方向や軸に交差する方向、回転方向、これらの方向の力が混じって振れ回るように動いたりしてもがたつきが生じたりすることのない高強度で固定することが可能な圧縮機固定用ボルトの固定方法、及び圧縮機固定用ボルトの高強度での固定が行えると共に、水が内部に入った場合でも水捌けがよくボルト固定部分での良好な腐食防止が実現できる空気調和機の室外機を提供することにある。
【００１４】
【課題を解決するための手段】
本発明の圧縮機固定用ボルトの固定方法は、圧縮機収納部の底板に固定されると共に、底板の表面側上方に突出する軸部に防振材を介し圧縮機を取付ける圧縮機固定用ボルトの固定方法において、圧縮機固定用ボルトを、底板に形成された略円形状の挿通孔に裏面側から表面側に貫通するよう軸部を挿入して該底板の裏面側にボルト頭部を残し、その後に、軸部の底板表面側の円柱状根元部分を塑性変形させ、形成された変形部とボルト頭部とで底板の挿通孔の縁部分を挟み込むと同時に、底板の変形部とボルト頭部とにより挟み込まれた部分を表面側に凸となるようにかしめると共に、圧縮機固定用ボルトを塑性変形させて底板にかしめ固定した軸部のかしめ形状を、外周部分で平坦面となるように、軸中心側部分で外周部分に向けて下り勾配となる面となるようにすることを特徴とする方法であり、
さらに、圧縮機固定用ボルト挿入前の底板に、挿通孔の周囲に裏面側に凸となる突出部をプレス加工により形成したことを特徴とする方法であり、
さらに、底板の挿通孔は、縁部に切り欠きを有するものであることを特徴とする方法であり、
さらに、底板の挿通孔は、裏面側から表面側に向けての打ち抜き加工により形成したものであることを特徴とする方法である。
【００１５】
また、本発明の空気調和機の室外機は、底板に表面側上方に突出するよう固定された圧縮機固定用ボルトの軸部に防振材を介し圧縮機を取付けてなる空気調和機の室外機において、圧縮機固定用ボルトは、底板に形成された略円形状の挿通孔に裏面側から表面側に貫通するよう軸部を挿入して該底板の裏面側に残したボルト頭部と、軸部の底板表面側の円柱状根元部分を塑性変形させた変形部とで底板の挿通孔の縁部分を挟み込むようにしてかしめ固定してあり、底板は、変形部とボルト頭部とにより挟み込まれた部分が、かしめにより表面側に凸となっており、底板に固定された圧縮機固定用ボルトの軸部のかしめ形状が、外周部分で平坦面となっており、軸中心側部分で前記外周部分に向けて下り勾配となる面となっていることを特徴とするものであり、
さらに、底板が、変形部とボルト頭部とにより挟み込まれた部分の周囲に裏面側に凸となる突出部を有していることを特徴とするものであり、
さらに、底板の挿通孔が、縁部に切り欠きを有していることを特徴とするものである。
【００１６】
【発明の実施の形態】
以下、本発明の一実施形態を図１乃至図９を参照して説明する。図１は空気調和機の室外機の斜視図であり、図２は空気調和機の室外機の縦断面図であり、図３は室外機の底板への圧縮機取り付け部分を拡大して示す縦断面図であり、図４は室外機の底板への圧縮機固定用ボルトの固定について説明する図で、図４（ａ）は圧縮機固定用ボルトを底板の挿通孔に挿入する前の状態を示す斜視図、図４（ｂ）は底板に圧縮機固定用ボルトを固定した状態を示す縦断面図であり、図５は室外機の底板に挿通孔を形成する工程を説明するための縦断面図であり、図６は室外機の底板に圧縮機固定用ボルトをかしめ固定する工程を説明するための縦断面図であり、図７はかしめ方向と圧縮機固定用ボルトの回転破壊トルクの関係を示す図であり、図８は第１の変形形態における室外機の底板に固定された圧縮機固定用ボルトの縦断面図であり、図９は第２の実施形態における底板に形成された挿通孔の平面図である。
【００１７】
図１乃至図９において、３１は空気調和機の室外機で、室外機３１の内部には冷凍サイクルを構成する圧縮機３２及び室外熱交換器３３等と、この室外熱交換器３３での熱交換を促進するよう設けられた室外ファン３４などが収納されている。そして、圧縮機３２や室外熱交換器３３、室外ファン３４などは、室外機３１の底面を形成する底板３５にそれぞれ載置されている。なお、３６は底板３５に載置された圧縮機３２や室外熱交換器３３、室外ファン３４などの上方を覆うように取り付けられたカバーであり、３７は底板３５の裏面側に固定された据付脚である。さらに、３８は冷凍サイクルの冷媒が図示しない室内機との間を循環するように設けられた配管であり、３９は室内機で生じたドレンを排出するための排水管である。
【００１８】
また、圧縮機３２の底板３５への載置は、圧縮機３２の下部に設けられた固定脚４０の固定用孔４１を、防振材である防振ゴム４２などを間に挟み込むようにして底板３５の表面側上方に突出するように立設した複数の圧縮機固定用ボルト４３に挿入した後、圧縮機固定用ボルト４３にナット４４を螺着し固定することにより行われている。
【００１９】
そして底板３５への圧縮機固定用ボルト４３の立設は、次のように行われている。すなわち、圧縮機固定用ボルト４３は、底板３５の所定位置に形成された円形状の挿通孔４５に底板３５の裏面側から表面側に、先端部分にねじが形成された段付きの軸部４６を、挿通孔４５と略同直径の径大の円柱状に形成された根元部分４６ａまで貫通するよう挿入し、底板３５の裏面側にボルト頭部４７が残るようにした状態で、底板３５の表面側の軸部４６の根元部分４６ａを塑性変形させ、形成された変形部４８と円形状のボルト頭部４７とで底板３５の挿通孔４５の縁部分を挟み込むようにかしめ固定してある。
【００２０】
また、このかしめ固定によって底板３５は、圧縮機固定用ボルト４３が立設した部分でボルト頭部４７により裏面側から表面側に押し出されるように微小変形し、軸部４６の変形部４８とボルト頭部４７とにより挟み込まれた部分が表面側に押し上げられた状態の凸状３５ａとなっている。ちなみに、この底板３５の凸状３５ａの微小変形形状は、底板３５の厚さが約１ｍｍで、ボルト頭部４７の直径が１５ｍｍ〜２０ｍｍ程度のねじ径が６ｍｍ〜８ｍｍ程度の圧縮機固定用ボルト４３の場合で、高さ寸法が１ｍｍ程度の凸となるよう押し出されたものである。さらに、この軸部４６を塑性変形させ変形部４８を形成するようにして行ったかしめ部分のかしめ形状は、挿通孔４５の縁部分の全周をボルト頭部４７とで挟む鍔状の外周部分４８ａで上面が平坦な水平面となっており、軸中心側部分４８ｂで上面が外周部分４８ａに向けて下り勾配となる、例えば断面が円弧形状の曲面状、円錐面状などの連続曲面となっている。
【００２１】
また、底板３５への圧縮機固定用ボルト４３の立設するに際し、まず底板３５の平坦となっている所定位置に挿通孔４５を、例えば図５に示すように底板３５の表面側を下にし裏面側を上向きにした状態で孔抜き型４９の固定された受け金型５０上にセットし、可稼動側のパンチ金型５１により裏面側から表面側への打ち抜きによる孔加工により形成する。これにより挿通孔４５の端面には、裏面側の端縁に孔加工時に引っ張られることによってだれが生じ、表面側の端縁にばりが生じ、極めて僅かであるが表面側に向けて曲がった状態になる。
【００２２】
その後、図６に示すように底板３５と圧縮機固定用ボルト４３をかしめ型５２の下金型５３にセットする。下金型５３は、孔５４が設けられた超硬合金でなる中空受け台５５と、この中空受け台５５を保持する保持台５６と、保持台５６の上面に中空受け台５５の孔５４を囲むように配置された弾性体等でなる緩衝材である圧縮スプリング５７とを備え、さらに中空受け台５５の孔５４の上縁部分には断面形状が円弧状曲面の凹部５８が形成されている。そして下金型５３にセットした状態では底板３５は、表面側を下にし裏面側を上向きにし、孔５４に挿通孔４５を位置合わせするようにして圧縮スプリング５７の上に支持されており、また圧縮機固定用ボルト４３は、軸部４６を底板３５の裏面側から挿通孔４５に挿入しボルト頭部４７を裏面側に残して底板３５に保持されている。
【００２３】
続いて、かしめ型５２の可稼動側の上金型５９によって底板３５への圧縮機固定用ボルト４３のかしめ固定を行う。上金型５９を所定のストロークで動作させると、圧縮スプリング５７の所定の付勢力により底板３５の挿通孔４５の縁周囲がボルト頭部４７の表面側である首側面にがたつきがないように押し当てられ、さらに、この押し当てられた状態のままで中空受け台５５の上端面及び凹部５８により圧縮機固定用ボルト４３の軸部４６の根元部分４６ａが塑性変形する。そして、図４に示すように根元部分４６ａが塑性変形することで所定かしめ形状の変形部４８が形成され、変形部４８とボルト頭部４７とで底板３５の挿通孔４５の縁部分を挟み込むようにかしめる。また、このかしめと同時に、底板３５の圧縮機固定用ボルト４３の立設部分の周囲が、ボルト頭部４７により裏面側から表面側に押し上げられた状態の凸状３５ａとなるように微小変形する。この後、底板３５に立設した圧縮機固定用ボルト４３には、圧縮機３２の固定脚４０が防振ゴム４２などを介し挿入されナット４４が螺着され、圧縮機３２が取り付けられる。
【００２４】
このように底板３５が表面側に凸状となるようかしめる構成とすることにより、圧縮機固定用ボルト４３は底板３５の所定位置に、回転方向及び軸方向に作用する力のいずれに対しても、また、これらの方向の力が合成された振れ回るように作用する軸方向に垂直な面の方向のこじるような力に対してもかしめ部分は十分な強度を有するものとなるので、高強度で固定され立設される。そして上記のような底板３５が表面側に凸状となるかしめを行うようにした根拠について説明する。すなわち、かしめにより底板３５の変形部４８とボルト頭部４７との間に挟み込まれる部分が、挟み込み前と同じ平坦面を保つには、かしめにより変形する軸部４６の根元部分４６ａの肉の体積分以上の逃げが必要である。
【００２５】
しかし、この逃げを大きくすると底板３５の挟み込まれる部分に掛かる変形部４８のかしめしろとなる肉が少なくなり、安定して十分な強度を得ることができなくなる。そこで、逃げを変形する軸部４６の根元部分４６ａの肉の体積分以下にすると当然かしめしろか多くなるが、この場合は変形する肉の量が多くなることになり、底板３５の挿通孔４５を押し拡げる方向に力が集中し、この結果、挿通孔４５の周囲の底板３５は表面側が凸状に突出するか、若しくは裏面側に凸状に突出し表面側が凹むかのいずれかの変形が発生する。
【００２６】
このため、表面側が凸状となるようにかしめを行ったものと裏面側が凸状となるようにかしめを行ったものの固定強度を比較するために両者の試料を作成し、所定の高さから所定の重さの重量物を底板３５から突出した圧縮機固定用ボルト４３の軸部４６の上端に軸方向に衝突させる衝撃試験を行った後の回転破壊卜ルクを測定したところ、横軸に試料ＮＯ．を取り縦軸に回転破壊卜ルクを取って示す図７の通りの結果となった。この結果から明らかなように、それぞれの試料でその回転破壊卜ルクを見ると、底板３５が表面側に凸状となった場合は、裏面側に凸状となった場合に比べ約１．５倍の回転破壊卜ルクがあることが判明した。
【００２７】
これは、底板３５が表面側に凸状となった場合には、底板３５の挿通孔４５が拡がる方向への逃げが少なく、裏面側に凸状となった場合には底板３５の挿通孔４５が拡がる方向への逃げが大きいためにかしめしろが少なくなったことによるものと思われる。上記の結果に基づいて、圧縮機３２を底板３５に固定するための圧縮機固定用ボルト４３として十分な強度を得るために底板３５を表面側に凸状となるように本実施形態においてはかしめを行っている。また上記のものでは、挿通孔４５を形成する際に底板３５の裏面側から表面側に打ち抜くように加工しているので、挿通孔４５の端面は表面側に向けて曲がった形状となり、表面側端縁に表面側方向のばりが形成される。このため、このようにばりが形成された状態で圧縮機固定用ボルト４３のかしめを行うと、より底板３５が表面側に凸状となり易い。
【００２８】
さらに、かしめ形状を上面が外周部分４８ａで平坦な水平面、軸中心側部分４８ｂで外周部分４８ａに向けて下り勾配となる連続曲面としているので、室外機３１内に水が入りかしめ部分に水が掛かった場合でも、かしめ部分の上面形状が下り勾配の連続曲面と水平な面で形成されているため、水捌けがよく水が溜まらないので、かしめ部分の腐食が防止される。さらにまた底板３５が表面側に凸状となっているので同様に水捌けがよく、底板３５の挿通孔４５及び近傍部分での腐食が防止される。
【００２９】
なお、上記の本発明は上記の構成のみに限定されるものではなく、図８に示す第１の変形形態のように構成してもよい。すなわち、圧縮機固定用ボルト４３を立設する底板６０の挿通孔４５の周囲に、全周若しくは部分的に底板６０の裏面側に凸となる所定高さの突出部６１を予め形成しておく。そして、上記の実施形態と同様にして挿通孔４５と突出部６１が形成された状態の底板６０に、圧縮機固定用ボルト４３の軸部４６の根元部分を塑性変形させ、変形部４８とボルト頭部４７とで挿通孔４５の縁部分の底板６０を挟み込み、さらにボルト頭部４７により底板６０の裏面側から表面側に微小変形した凸状３５ａが形成されるように押し上げるかしめ加工を行い圧縮機固定用ボルト４３を立設する。
【００３０】
このように構成することで、かしめ加工を行う際に底板６０がより表面側に凸状となり易くなると共に、上記実施形態と同様の効果が得られる。
【００３１】
また、図９に示す第２の変形形態のように構成してもよい。すなわち、圧縮機固定用ボルトを立設する底板６２の挿通孔６３を、その縁部に１２０゜の間隔で、例えば切り込み深さ約０．５ｍｍの切り欠き６４を有したものとしておく。そして、圧縮機固定用ボルトの底板６２への立設を上記の実施形態と同様に行う。つまり、挿通孔６３に圧縮機固定用ボルトを裏面側にボルト頭部を残すように挿入し、軸部の根元部分を塑性変形させ、形成された変形部とボルト頭部とで挿通孔６３の縁部分の底板６２を挟み込み、さらにボルト頭部により底板６２の裏面側から表面側に微小変形した凸状が形成されるように押し上げるかしめ加工を行う。
【００３２】
このようにかしめ加工を行うことで、変形部の一部が挿通孔６３の縁部に形成した切り欠き６４に入り込んだ状態で圧縮機固定用ボルトが底板６２に固定される。このように構成することで、圧縮機固定用ボルトと底板６２との結合が確実になり、回転破壊トルクが向上し固定強度が増すと共に、上記実施形態と同様の効果が得られる。
【００３３】
【発明の効果】
以上の説明から明らかなように、本発明の圧縮機固定用ボルトの固定方法によれば、ボルト先端側部分に取り付けられる圧縮機が輸送中等に動き、軸方向や軸に交差する方向、回転方向、これらの方向の力が混じったこじるように作用する力に対してもがたつきが生じることのない高強度の圧縮機固定用ボルトの固定が行える。
【００３４】
また本発明の空気調和機の室外機によれば、圧縮機固定用ボルトの高強度での固定が行えると共に、水が内部に入った場合でも水捌けがよくボルト固定部分の腐食が防止できる。
【図面の簡単な説明】
【図１】本発明の一実施形態である空気調和機の室外機の斜視図である。
【図２】本発明の一実施形態である空気調和機の室外機の縦断面図である。
【図３】本発明の一実施形態に係る室外機の底板への圧縮機取り付け部分を拡大して示す縦断面図である。
【図４】本発明の一実施形態における室外機の底板への圧縮機固定用ボルトの固定について説明する図で、図４（ａ）は圧縮機固定用ボルトを底板の挿通孔に挿入する前の状態を示す斜視図、図４（ｂ）は底板に圧縮機固定用ボルトを固定した状態を示す縦断面図である。
【図５】本発明の一実施形態に係る室外機の底板に挿通孔を形成する工程を説明するための縦断面図である。
【図６】本発明の一実施形態に係る室外機の底板に圧縮機固定用ボルトをかしめ固定する工程を説明するための縦断面図である。
【図７】本発明の一実施形態におけるかしめ方向と圧縮機固定用ボルトの回転破壊トルクの関係を示す図である。
【図８】本発明の一実施形態に係る第１の変形形態における室外機の底板に固定された圧縮機固定用ボルトの縦断面図である。
【図９】本発明の一実施形態に係る第２の実施形態における底板に形成された挿通孔の平面図である。
【図１０】第１の従来技術の圧縮機取付用ボルトの固定方法を示す図で、図１０（ａ）はかしめ加工の第１の工程を示す斜視図、図１０（ｂ）はかしめ加工の第２の工程を示す斜視図、図１０（ｃ）はかしめ加工の第３の工程を示す斜視図である。
【図１１】第２の従来技術におけるかしめによる固着前の状態を示す分解を示す斜視図である。
【図１２】第２の従来技術におけるかしめによる固着時の縦断面図である。
【図１３】第３の従来技術を示す図で、図１３（ａ）はかしめ結合前の状態を示す断面図、図１３（ｂ）はかしめ結合終了時の状態を示す断面図である。
【符号の説明】
３１…室外機
３２…圧縮機
３５，６０，６２…底板
３５ａ…凸状
４０…固定脚
４２…防振ゴム
４３…圧縮機固定用ボルト
４４…ナット
４５，６３…挿通孔
４６…軸部
４６ａ…根元部分
４７…ボルト頭部
４８…変形部
４８ａ…外周部分
４８ｂ…軸中心側部分
６１…突出部
６４…切り欠き[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing method of a compressor fixing bolt used for mounting a compressor and an outdoor unit of an air conditioner.
[0002]
[Prior art]
As is well known, an outdoor unit of an air conditioner houses a compressor and an outdoor heat exchanger that constitute a refrigeration cycle, and an outdoor fan that is provided so as to promote heat exchange in the outdoor heat exchanger. Yes. Moreover, these compressors, outdoor heat exchangers, outdoor fans, and the like are each mounted on a bottom plate that forms the bottom surface of the outdoor unit. And, for mounting on the bottom plate of the compressor, after inserting the fixing holes of the fixing legs provided at the lower portion of the compressor into a plurality of fixing bolts erected on the bottom plate through vibration proof rubber or the like, The nut is fixed to the fixing bolt. This prevents adverse effects on the compressor itself and breakage of the refrigerant piping connected to the compressor due to vibration during transportation and vibration of the compressor when the air conditioner is operated.
[0003]
The fixing bolt for fixing the compressor to the bottom plate of the outdoor unit has been firmly attached by spot welding a flange portion formed on the fixing bolt to the bottom plate. However, spot welding leaves a weld mark on a horizontal surface, so that there is a problem that rust is likely to occur due to accumulation of moisture in the welded part and a troublesome welding process is required. It was.
[0004]
Various configurations have been proposed to solve such problems, and these conventional techniques will be described below with reference to the drawings. First, in Japanese Patent Application Laid-Open No. 56-86218, as shown in FIG. 10 as a first prior art, a bottom plate 2 in which an aperture round hole 1 is formed and an angular root portion 3 penetrating the aperture round hole 1 are provided. Using the compressor mounting bolt 4, the square base portion 3 of the compressor mounting bolt 4 inserted into the throttle round hole 1 is plastically deformed by the upper mold 6 and the lower mold 7 in which the holes 5 are formed. The method of fixing by this is described. According to this method, there is an advantage that the possibility of rusting from the fixed portion is low and the manufacture is simplified. However, fixing by caulking is a pressure bonding by deformation of a metal material, so it is difficult to obtain mechanical strength equivalent to welding, and there is variation in strength for each caulking, making it difficult to obtain a product with stable strength. There was a problem.
[0005]
On the other hand, when a heavy object such as a compressor is fixed via an anti-vibration material such as rubber, the caulked portion of the bottom plate of the outdoor unit or the like and the fixing bolt is subjected to an external force acting in the axial direction of the fixing bolt. When the nut is attached to the fixing bolt, it receives both external forces acting in the rotational direction around the fixing bolt. For this reason, it is necessary for the caulking portion to have a strength that is sufficiently extinguished with respect to both forces.
[0006]
However, in the above-mentioned Japanese Patent Application Laid-Open No. 56-86218, for example, the rectangular base portion in which the cross-sectional shape of the throttle round hole 1 and the compressor mounting bolt 4 which is a fixing bolt is hexagonal. There are many gaps between the three, and a lot of meat escapes into the gaps during caulking. As a result, the caulking portion does not have sufficient strength with respect to any force acting in the rotational direction and the axial direction.
[0007]
Next, in Japanese Patent Publication No. 56-7446, as shown in FIG. 11 and FIG. 12 as the second prior art, for example, a metal plate 9 having a hexagonal square hole 8 formed therein and the square hole 8 are penetrated. Using a screw 12 having a hexagonal square shaft 10 at the root portion and a screw shaft 11 at the tip portion, the square shaft 10 of the screw 12 inserted into the square hole 8 is made of cemented carbide. A method is described in which a hollow punch body 14 having an outlet portion 13 formed and a base plate 15 are plastically deformed and fixed. Reference numeral 16 denotes a head of the screw 12, reference numeral 17 denotes a hole formed in the hollow punch body 14, and reference numeral 18 denotes an elastic body inserted between the upper surface of the hollow punch body 14 and the metal plate 9. It is a buffer material and 20 is a knockout pin.
[0008]
However, since the square hole 8 is formed in the metal plate 9 and the screw 12 is provided with the square axis 10 at the root portion, when the square axis 10 is inserted into the square hole 8, the square hole 10 is inserted before insertion. If the two corners of the shape need to be matched, it cannot be easily inserted automatically by the machine, requires manual work, and the manufacturability becomes extremely poor. However, the configuration and control of the machine to be used becomes very complicated. Further, the combination of the square hole 8 and the square axis 10 shows a high strength against the force in the rotational direction, but the amount of meat that is plastically deformed by caulking at the hexagonal side part of the square axis 10 that is the caulking part. Therefore, the area for pressing the metal plate 9 is small, and the strength against the external force acting in the axial direction of the screw 12 is low.
[0009]
Next, as shown in FIG. 13 as the third prior art in Japanese Patent Application Laid-Open No. 8-159132, the bolt 21 has a deformed shaft portion 23 and an annular groove 24 at the base end of the screw shaft portion 22. After this bolt 21 is inserted into the through hole 26 formed in the plate 25 up to the deformed shaft portion 23, the head 21 of the bolt 21 is erected so as to be placed on the receiving base 28, and the caulking tool 29 from the screw shaft portion 22 side. Is inserted and pressed to deform the deformable shaft portion 23 to form a plastically deformed portion 23a and to deform the caulking hole 26 portion of the plate 25 into the annular groove 24 and fix it by caulking. .
[0010]
In this method, the plastic deformed portion 23a is formed by the meat obtained by plastically deforming the deformable shaft portion 23 by pressing with the caulking tool 29, and the plate 25 is bitten into the annular groove 24, so that the surface of the plate 25 and the surface of the plastic deformable portion 23a are obtained. Is improved to improve the adhesion with a flat surface of a support panel (not shown) to which the bolt 21 is fixed, and the bolt 21 is firmly fixed. For this reason, this method requires little fixing strength in the direction of the surface perpendicular to the axis of the bolt 21.
[0011]
However, in the fixing bolts used to fix the compressor, an anti-vibration rubber or the like is interposed between the fixing legs provided on the compressor and the fixing bolts so that the fixing legs normally apply force to the fixing bolts. However, a tremendous amount of force is applied to the fixing bolts at a stroke during vibration or dropping during transportation. That is, in the fixing bolt for the compressor, there is a possibility that a large force is applied in the direction perpendicular to the axis, and it is necessary to increase the strength in this direction.
[0012]
However, in the above-mentioned JP-A-8-159132, the bolt 21 is caulked and fixed to the plate 25, and the deformation shaft portion 23 of the bolt 21 is plastically deformed to form the plastic deformation portion 23a. Since the hole 26 portion is deformed so as to bite into the annular groove 24, the deformation amount in the deformed portion of the plate 25 is large, and the wall thickness in this portion is also reduced. The strength against a force that squeezes in the direction perpendicular to the axis is low, and such a caulking and fixing method cannot be directly applied to a fixing bolt of a compressor.
[0013]
[Problems to be solved by the invention]
The present invention has been made in view of the above situation, and the object of the present invention is to move the compressor fixing bolt to the bottom plate of the compressor housing and the compressor attached to the bolt tip side portion during transportation. , Axial direction of the bolt for fixing the compressor, the direction crossing the axis, the rotational direction, and fixing with high strength that does not cause rattling even if it moves by mixing the forces in these directions Compressor fixing bolt fixing method and compressor fixing bolt can be fixed with high strength, and even when water enters the inside, it is well-drained and prevents corrosion at the bolt fixing part. It is in providing the outdoor unit of the air conditioner which can implement | achieve.
[0014]
[Means for Solving the Problems]
The compressor fixing bolt fixing method according to the present invention is a compressor fixing bolt that is fixed to the bottom plate of the compressor housing portion and attaches the compressor to the shaft portion protruding upward on the surface side of the bottom plate via a vibration isolating material. In this fixing method, a compressor fixing bolt is inserted into a substantially circular insertion hole formed in the bottom plate so as to penetrate from the back surface to the front surface side, leaving the bolt head on the back surface side of the bottom plate. Thereafter, the cylindrical base portion on the bottom plate surface side of the shaft portion is plastically deformed, and the edge portion of the insertion hole of the bottom plate is sandwiched between the formed deformed portion and the bolt head, and at the same time, the deformed portion of the bottom plate and the bolt head The part sandwiched by the part is caulked so that it protrudes to the surface side, and the caulking shape of the shaft part that is caulked and fixed to the bottom plate by plastically deforming the compressor fixing bolt so that it becomes a flat surface at the outer peripheral part Down toward the outer periphery at the shaft center side A method, characterized by such a distribution and becomes surface,
Furthermore, the bottom plate before inserting the compressor fixing bolt is a method characterized by forming a protruding portion that is convex on the back side around the insertion hole by pressing,
Further, the insertion hole of the bottom plate is a method characterized by having a notch at the edge,
Further , the insertion hole of the bottom plate is formed by punching from the back surface side to the front surface side.
[0015]
The outdoor unit of the air conditioner of the present invention is an outdoor unit of an air conditioner in which a compressor is attached to a shaft portion of a compressor fixing bolt fixed to a bottom plate so as to protrude upward on the surface side through a vibration isolator. In the machine, the bolt for fixing the compressor is a bolt head left on the back surface side of the bottom plate by inserting the shaft portion so as to penetrate the substantially circular insertion hole formed in the bottom plate from the back surface side to the front surface side, The bottom plate is clamped and fixed so that the edge of the insertion hole of the bottom plate is sandwiched between the deformed portion obtained by plastic deformation of the cylindrical base of the bottom plate surface side of the shaft, and the bottom plate is sandwiched between the deformed portion and the bolt head. The caulked portion is convex on the surface side by caulking, and the caulking shape of the shaft portion of the compressor fixing bolt fixed to the bottom plate is a flat surface at the outer peripheral portion, and the shaft center side portion and characterized in that toward the outer circumferential portion has a surface to be the downward slope Is shall,
Furthermore, the bottom plate is characterized in that it has a protruding part that is convex on the back side around the part sandwiched between the deforming part and the bolt head part,
Furthermore, the insertion hole of the bottom plate, and is characterized in that it has a notch on the edge.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of an outdoor unit of an air conditioner, FIG. 2 is a longitudinal sectional view of the outdoor unit of the air conditioner, and FIG. 3 is an enlarged longitudinal section showing a compressor mounting portion on the bottom plate of the outdoor unit. FIG. 4 is a diagram for explaining the fixing of the compressor fixing bolt to the bottom plate of the outdoor unit. FIG. 4 (a) shows the state before the compressor fixing bolt is inserted into the insertion hole of the bottom plate. FIG. 4B is a longitudinal sectional view showing a state in which the compressor fixing bolt is fixed to the bottom plate, and FIG. 5 is a longitudinal sectional view for explaining a process of forming the insertion hole in the bottom plate of the outdoor unit. FIG. 6 is a longitudinal sectional view for explaining the process of caulking and fixing the compressor fixing bolt to the bottom plate of the outdoor unit, and FIG. 7 is the relationship between the caulking direction and the rotational breaking torque of the compressor fixing bolt. FIG. 8 is a view showing a compressor fixed to the bottom plate of the outdoor unit in the first modified embodiment. Is a longitudinal sectional view of the bolt, FIG. 9 is a plan view of the insertion hole formed in the bottom plate in the second embodiment.
[0017]
1 to 9, reference numeral 31 denotes an outdoor unit of an air conditioner. Inside the outdoor unit 31, a compressor 32, an outdoor heat exchanger 33, and the like constituting a refrigeration cycle, and heat in the outdoor heat exchanger 33 are provided. The outdoor fan 34 provided so as to facilitate the exchange is accommodated. The compressor 32, the outdoor heat exchanger 33, the outdoor fan 34, and the like are respectively placed on a bottom plate 35 that forms the bottom surface of the outdoor unit 31. Reference numeral 36 denotes a cover attached so as to cover the upper side of the compressor 32, the outdoor heat exchanger 33, the outdoor fan 34 and the like placed on the bottom plate 35, and 37 denotes an installation fixed to the back side of the bottom plate 35. It is a leg. Further, 38 is a pipe provided so that the refrigerant of the refrigeration cycle circulates between the indoor units (not shown), and 39 is a drain pipe for discharging the drain generated in the indoor units.
[0018]
Further, the compressor 32 is mounted on the bottom plate 35 such that the fixing hole 41 of the fixing leg 40 provided at the lower part of the compressor 32 is sandwiched with the vibration isolating rubber 42 or the like as a vibration isolating material. After inserting into a plurality of compressor fixing bolts 43 erected so as to protrude above the surface side of the bottom plate 35, nuts 44 are screwed onto and fixed to the compressor fixing bolts 43.
[0019]
The standing of the compressor fixing bolt 43 on the bottom plate 35 is performed as follows. That is, the compressor fixing bolt 43 has a stepped shaft portion 46 in which a screw is formed at a tip portion from a back surface side to a front surface side of the bottom plate 35 in a circular insertion hole 45 formed at a predetermined position of the bottom plate 35. Are inserted so as to penetrate to a base portion 46a formed in a cylindrical shape having a large diameter substantially the same diameter as the insertion hole 45, and the bolt head 47 remains on the back surface side of the bottom plate 35. The base portion 46a of the shaft portion 46 on the surface side is plastically deformed, and is fixed by caulking so that the edge portion of the insertion hole 45 of the bottom plate 35 is sandwiched between the formed deformed portion 48 and the circular bolt head portion 47.
[0020]
Further, by this caulking, the bottom plate 35 is slightly deformed so as to be pushed out from the back side to the front side by the bolt head 47 at the portion where the compressor fixing bolt 43 is erected, and the deformed portion 48 of the shaft portion 46 and the bolt A portion sandwiched by the head 47 is a convex shape 35a in a state of being pushed up to the surface side. By the way, the micro deformed shape of the convex shape 35a of the bottom plate 35 is a compressor fixing bolt in which the thickness of the bottom plate 35 is about 1 mm and the bolt head 47 has a diameter of about 15 mm to 20 mm and a screw diameter of about 6 mm to 8 mm. In the case of 43, the height is extruded so as to be a convex of about 1 mm. Further, the caulking shape of the caulking portion performed by plastically deforming the shaft portion 46 to form the deforming portion 48 is a hook-like outer peripheral portion sandwiching the entire circumference of the edge portion of the insertion hole 45 with the bolt head 47. The upper surface is a flat horizontal surface at 48a, and the upper surface of the shaft center side portion 48b is downwardly inclined toward the outer peripheral portion 48a. For example, the curved surface has a circular curved surface shape or a continuous curved surface such as a conical surface shape. Yes.
[0021]
Further, when the compressor fixing bolt 43 is erected on the bottom plate 35, first, the insertion hole 45 is first placed at a predetermined position where the bottom plate 35 is flat, and the surface side of the bottom plate 35 is placed downward as shown in FIG. It is set on a receiving mold 50 to which a punching die 49 is fixed with the back surface side facing upward, and is formed by punching from the back surface side to the front surface side by a punch die 51 on the operable side. As a result, the end face of the insertion hole 45 is pulled by the end edge on the back surface side during the drilling, and the end edge on the surface side is burred, and is bent slightly toward the front surface side. become.
[0022]
Thereafter, as shown in FIG. 6, the bottom plate 35 and the compressor fixing bolt 43 are set in the lower mold 53 of the caulking mold 52. The lower mold 53 includes a hollow receiving base 55 made of a cemented carbide having a hole 54, a holding base 56 that holds the hollow receiving base 55, and a hole 54 of the hollow receiving base 55 on the upper surface of the holding base 56. And a compression spring 57 that is a cushioning material made of an elastic body or the like disposed so as to surround, and further, a concave portion 58 having an arcuate curved surface is formed in the upper edge portion of the hole 54 of the hollow receiving base 55. . In the state of being set in the lower mold 53, the bottom plate 35 is supported on the compression spring 57 so that the front side faces downward and the back side faces upward, and the insertion hole 45 is aligned with the hole 54. The compressor fixing bolt 43 is held by the bottom plate 35 with the shaft portion 46 inserted into the insertion hole 45 from the back side of the bottom plate 35 and the bolt head 47 left on the back side.
[0023]
Subsequently, the compressor fixing bolt 43 is caulked and fixed to the bottom plate 35 by the upper mold 59 on the movable side of the caulking mold 52. When the upper mold 59 is operated with a predetermined stroke, the periphery of the edge of the insertion hole 45 of the bottom plate 35 does not rattle on the neck side surface that is the surface side of the bolt head 47 by the predetermined urging force of the compression spring 57. Furthermore, the base portion 46a of the shaft portion 46 of the compressor fixing bolt 43 is plastically deformed by the upper end surface of the hollow receiving base 55 and the recess 58 in the pressed state. Then, as shown in FIG. 4, the base portion 46 a is plastically deformed to form a deformed portion 48 having a predetermined caulking shape, and the deformed portion 48 and the bolt head portion 47 sandwich the edge portion of the insertion hole 45 of the bottom plate 35. Caulking. At the same time as this caulking, the periphery of the raised portion of the compressor fixing bolt 43 of the bottom plate 35 is slightly deformed so as to have a convex shape 35a pushed up from the back surface side to the front surface side by the bolt head 47. . Thereafter, the fixing leg 40 of the compressor 32 is inserted into the compressor fixing bolt 43 erected on the bottom plate 35 through the vibration isolating rubber 42 and the nut 44 is screwed, and the compressor 32 is attached.
[0024]
In this way, the bottom plate 35 is caulked so as to be convex on the surface side, so that the compressor fixing bolt 43 can be applied to a predetermined position of the bottom plate 35 with respect to any force acting in the rotational direction and the axial direction. In addition, the caulking portion has sufficient strength against a force that is twisted in the direction perpendicular to the axial direction that acts so that the forces in these directions are combined. It is fixed and installed with strength. The basis for caulking the bottom plate 35 to be convex on the surface side will be described. That is, the volume of the meat of the base portion 46a of the shaft portion 46 that is deformed by caulking in order to keep the portion sandwiched between the deformed portion 48 and the bolt head portion 47 of the bottom plate 35 by caulking to have the same flat surface as before the clamping. It is necessary to escape more than a minute.
[0025]
However, when this relief is increased, the meat that becomes the caulking of the deformable portion 48 applied to the portion where the bottom plate 35 is sandwiched is reduced, and sufficient strength cannot be obtained stably. Accordingly, if the volume is less than the volume of the meat of the root portion 46a of the shaft portion 46 that deforms the relief, the amount of meat to be deformed increases naturally. In this case, the insertion hole 45 of the bottom plate 35 increases. As a result, the bottom plate 35 around the insertion hole 45 is deformed either in a convex shape on the front side or in a convex shape on the back side and indented on the front side. To do.
[0026]
For this reason, in order to compare the fixing strength of the one that has been caulked so that the front side is convex and the one that has been caulked so that the back side is convex, both samples are prepared, Rotating fracture bolts after an impact test in which a heavy object having a weight of 10 mm was collided in the axial direction with the upper end of the shaft portion 46 of the compressor fixing bolt 43 protruding from the bottom plate 35 were measured. NO. The result is as shown in FIG. As is apparent from this result, when the rotational fracture shells of each sample are viewed, when the bottom plate 35 is convex on the front surface side, it is about 1.5 times more than when it is convex on the back surface side. It was found that there was a double rotation breakage.
[0027]
This is because when the bottom plate 35 has a convex shape on the front surface side, there is little escape in the direction in which the insertion hole 45 of the bottom plate 35 expands, and when it has a convex shape on the back surface side, the insertion hole 45 of the bottom plate 35 has a convex shape. This is probably due to the fact that the amount of caulking has been reduced due to the large escape in the direction of spreading. Based on the above results, in the present embodiment, the bottom plate 35 is caulked to the front side in order to obtain sufficient strength as a compressor fixing bolt 43 for fixing the compressor 32 to the bottom plate 35. It is carried out. Further, in the above, since the insertion hole 45 is processed so as to be punched from the back surface side of the bottom plate 35 to the front surface side, the end surface of the insertion hole 45 is bent toward the front surface side. A flash in the surface side direction is formed at the edge. For this reason, when the compressor fixing bolt 43 is caulked in such a state where the flash is formed, the bottom plate 35 is more likely to be convex on the surface side.
[0028]
Furthermore, the caulking shape has a flat horizontal surface at the outer peripheral portion 48a and a continuous curved surface with a downward slope toward the outer peripheral portion 48a at the axial center side portion 48b, so that water enters the outdoor unit 31 and water enters the caulked portion. Even when it is hung, since the upper surface shape of the caulking portion is formed by a continuous curved surface with a downward slope and a horizontal surface, water is well drained and water does not accumulate, so that the caulking portion is prevented from corroding. Furthermore, since the bottom plate 35 has a convex shape on the surface side, water drainage is similarly good, and corrosion at the insertion hole 45 and the vicinity of the bottom plate 35 is prevented.
[0029]
Note that the present invention described above is not limited to the above-described configuration, and may be configured as in the first modification shown in FIG. That is, a protrusion 61 having a predetermined height is formed in advance around the insertion hole 45 of the bottom plate 60 on which the compressor fixing bolts 43 are erected. . Then, the base portion of the shaft portion 46 of the compressor fixing bolt 43 is plastically deformed on the bottom plate 60 in which the insertion hole 45 and the protruding portion 61 are formed in the same manner as in the above embodiment, and the deformed portion 48 and the bolt The bottom plate 60 at the edge of the insertion hole 45 is sandwiched between the head 47 and the bolt head 47 is pressed and compressed so as to form a convex 35a that is slightly deformed from the back side to the front side of the bottom plate 60. The machine fixing bolt 43 is erected.
[0030]
With this configuration, the bottom plate 60 is more likely to be convex on the surface side when performing caulking, and the same effects as in the above embodiment can be obtained.
[0031]
Moreover, you may comprise like the 2nd modification shown in FIG. In other words, the insertion holes 63 of the bottom plate 62 for standing the compressor fixing bolts are assumed to have notches 64 with an incision depth of about 0.5 mm, for example, at 120 ° intervals at the edges. Then, the compressor fixing bolt is erected on the bottom plate 62 in the same manner as in the above embodiment. In other words, the compressor fixing bolt is inserted into the insertion hole 63 so as to leave the bolt head on the back surface side, the base portion of the shaft portion is plastically deformed, and the formed deformation portion and the bolt head form the insertion hole 63. The bottom plate 62 at the edge is sandwiched, and further, a caulking process is performed by pushing up the bolt head so that a convex shape slightly deformed from the back surface side to the front surface side of the bottom plate 62 is formed.
[0032]
By performing the caulking process in this manner, the compressor fixing bolt is fixed to the bottom plate 62 in a state where a part of the deformed portion enters the notch 64 formed at the edge of the insertion hole 63. With this configuration, the compressor fixing bolt and the bottom plate 62 are securely connected, the rotational breaking torque is improved, the fixing strength is increased, and the same effect as in the above embodiment is obtained.
[0033]
【The invention's effect】
As is clear from the above description, according to the compressor fixing bolt fixing method of the present invention, the compressor attached to the bolt front end portion moves during transportation, and the axial direction, the direction crossing the axis, the rotational direction Thus, it is possible to fix the high-strength compressor fixing bolt without causing rattling against the force acting so that the forces in these directions are mixed.
[0034]
Further, according to the outdoor unit of the air conditioner of the present invention, the compressor fixing bolt can be fixed with high strength, and even when water enters inside, the water fixing is good and corrosion of the bolt fixing portion can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view of an outdoor unit of an air conditioner that is an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of an outdoor unit of an air conditioner that is an embodiment of the present invention.
FIG. 3 is a longitudinal sectional view showing, on an enlarged scale, a portion where the compressor is attached to the bottom plate of the outdoor unit according to the embodiment of the present invention.
FIG. 4 is a diagram for explaining fixing of a compressor fixing bolt to a bottom plate of an outdoor unit in one embodiment of the present invention, and FIG. 4 (a) is a diagram before inserting the compressor fixing bolt into the insertion hole of the bottom plate. FIG. 4B is a longitudinal sectional view showing a state in which a compressor fixing bolt is fixed to the bottom plate.
FIG. 5 is a longitudinal sectional view for explaining a process of forming an insertion hole in the bottom plate of the outdoor unit according to the embodiment of the present invention.
FIG. 6 is a longitudinal sectional view for explaining a step of caulking and fixing a compressor fixing bolt to the bottom plate of the outdoor unit according to the embodiment of the present invention.
FIG. 7 is a diagram showing a relationship between a caulking direction and a rotation breaking torque of a compressor fixing bolt in an embodiment of the present invention.
FIG. 8 is a longitudinal sectional view of a compressor fixing bolt fixed to a bottom plate of an outdoor unit in a first modified embodiment according to an embodiment of the present invention.
FIG. 9 is a plan view of an insertion hole formed in the bottom plate in the second embodiment according to the embodiment of the present invention.
FIGS. 10A and 10B are diagrams showing a method of fixing a compressor mounting bolt according to a first prior art, in which FIG. 10A is a perspective view showing a first step of caulking, and FIG. FIG. 10C is a perspective view showing a third step of caulking. FIG.
FIG. 11 is an exploded perspective view showing a state before fixing by caulking in the second prior art.
FIG. 12 is a longitudinal sectional view at the time of fixing by caulking in the second prior art.
13A and 13B are views showing a third prior art, in which FIG. 13A is a cross-sectional view showing a state before caulking and FIG. 13B is a cross-sectional view showing a state after caulking is completed.
[Explanation of symbols]
31 ... Outdoor unit 32 ... Compressor 35, 60, 62 ... Bottom plate 35a ... Convex 40 ... Fixed leg 42 ... Anti-vibration rubber 43 ... Compressor fixing bolt 44 ... Nut 45, 63 ... Insertion hole 46 ... Shaft 46a ... Root part 47 ... Bolt head part 48 ... Deformed part 48a ... Outer peripheral part 48b ... Shaft center side part 61 ... Projection part 64 ... Notch

Claims

In the fixing method of the compressor fixing bolt, the compressor fixing bolt is fixed to the bottom plate of the compressor housing portion, and the compressor is attached to the shaft portion protruding upward on the surface side of the bottom plate via a vibration isolator. The shaft portion is inserted into a substantially circular insertion hole formed in the bottom plate so as to penetrate from the back surface side to the front surface side, leaving a bolt head on the back surface side of the bottom plate, and then the shaft portion The cylindrical base portion on the bottom plate surface side is plastically deformed, and at the same time the edge portion of the insertion hole of the bottom plate is sandwiched between the formed deformed portion and the bolt head, the deformed portion of the bottom plate and the bolt head The portion sandwiched between the two portions is caulked so as to be convex toward the surface side, and the caulking shape of the shaft portion that is caulked and fixed to the bottom plate by plastic deformation of the compressor fixing bolt becomes a flat surface at the outer peripheral portion. As mentioned above, the shaft center side portion Compressor fixing method of fixing bolts, characterized in that to make the surface to be inclined downward toward the peripheral portion.

2. The method of fixing a compressor fixing bolt according to claim 1, wherein a protruding portion that protrudes toward the back surface is formed around the insertion hole on the bottom plate before insertion of the compressor fixing bolt by pressing.

2. The fixing method of a compressor fixing bolt according to claim 1, wherein the insertion hole of the bottom plate has a notch at the edge.

2. The fixing method for a compressor fixing bolt according to claim 1, wherein the through hole of the bottom plate is formed by punching from the back surface side to the front surface side.

In an outdoor unit of an air conditioner in which a compressor is attached to a shaft portion of a compressor fixing bolt fixed to a bottom plate so as to protrude upward on the surface side, the compressor fixing bolt is the bottom plate A bolt head left on the back surface side of the bottom plate by inserting the shaft portion so as to penetrate from the back surface side to the front surface side in a substantially circular insertion hole formed in the circle, and a circle on the bottom plate surface side of the shaft portion The bottom plate is fixed by crimping so as to sandwich the edge portion of the insertion hole of the bottom plate with a deformed portion obtained by plastic deformation of the columnar base portion, and the bottom plate has a portion sandwiched between the deformed portion and the bolt head portion. The crimping shape of the shaft portion of the compressor fixing bolt fixed to the bottom plate by caulking is a flat surface at the outer peripheral portion, and the outer periphery at the shaft center side portion. toward the part and has a surface to be the down slope Outdoor unit of an air conditioner which is characterized and.

6. The outdoor unit for an air conditioner according to claim 5 , wherein the bottom plate has a protruding portion that protrudes toward the back surface around a portion sandwiched between the deforming portion and the bolt head.

The outdoor unit for an air conditioner according to claim 5 , wherein the insertion hole of the bottom plate has a notch at the edge.