經濟部智慧財產局員工消费合作社印" β ^ -二1 b···· Α7 _Β7_ 五、發明說明（1 ) (發明所屬之技術領域） 本發明係關於一種車輛之副車架構造，特別是，關於 —種接合固定於車髋之下壁構成構件I能支撐懸架裝置或 驅動力傳動系統之一部分的車輛之副車架構造《 (以往之技術） 車輛例如汽車係在其車體之前後左右之各側部經由懸 架裝置分別安裝車輪*在此等各車輪經由配置於車體下部 之驅動力傳動系統來傳動旋轉力。如此，在車體下方配備 有懸架裝置及驅動力傳動系統等，此等係經由各種托架或 副車架被結合在車體之下壁構成構件之地板構件，熔接於 同地板構件且朝車體前後方向之左右一對側架，互相地結 合於同各側梁同時熔接於地板構件之直狀橫梁等•爲此， 車體之下壁構成構件係爲了耐久性優異又精度優異地支撐 懸架裝置，驅動力傳動系統及車輪等，必須保持充分之強 度。 然而，眾知在設於車體下部之左右一對側梁結合左右 端之副車架，特別是，此等左右端結合部間以左右傾斜部 及連結此等左右傾斜部之下端間之直狀中央部朝下方凸狀 地連續形成者》 該副車架構造係其左右端結合部與左右傾斜部下端之 彎曲部之間上下地僅偏移所定量•而且將左右懸架臂之下 臂基端經由橡膠襯套銷結合於各彎曲部。在彈簧支架部與 下臂之中央部之間裝設有螺旋彈簧。此時，左右下臂之各 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） I I--— Jillli' - ills — ^» — — — — — 1! Λ請先閲讀背面之注意事項再填寫本頁) -4 經濟部智慧財產局員工消费合作杜印製 、η 3、 A7 ___B7 _ 五、發明說明（2 〉 搖動端係經由轉向節樞裝車輪，來自車輪之路面反作用力 係經由下臂及螺旋彈簧被輸入在左右之各彈簧支架部，而 利用此等彈簧支架部分散支撐在左右梁側· 此等副車架構造之一例揭示於日本特開平7-3 1 5 2 4 5號公報。在此，於左右一對側梁熔接左右端 之前後一對橫梁內，朝上方凸狀地形成前橫梁，又朝下方 凸狀地形成後橫梁•即使左右一對側梁的朝車體中央側彈 性變形，此等，前後之各橫粱之變位量也能互相相等，使 車輪之下端角之偏差不會發生。在此所用之後橫梁係將縱 托架突設於確保於其中央上方之領域，而在同縱托架安裝 差速器箱。 (發明欲解決之課題） 然而，在如上所述地彈簧支架部與彎曲部上下地被偏 移之副車架構造中，若左右一對傾斜部上端之彈簧支架部 受到大載重時，使同傾斜部上端之彈簧支架部與各側梁一 起以各彎曲部側作爲支點朝車體中央側變形，有在車輪之 定位狀態產生偏差*或降低橫梁本體之耐久性之問題。特 別是在越野車輛中，由於車輪之上下行程設成較大而螺旋 彈簧較大，彈簧支架部與彎曲部之上下方向偏移量增大， 而傾斜部側以各彎曲部側作爲支架朝車體中央側變彤之趙 勢較大，在車輪之定位狀態產生大偏差，成爲問題· 又在揭示於日本特開平7 - 3 1 5 2 4 5號公報的車 輛之副車架構造中，容許前後橫梁之變位·僅使用此種橫 本紙張尺度適用中國國家標準<CNS>A4規格（210 * 297公« > ------------- .裝！| 訂·！ · <讀先W讀背面之注帝Ϊ事項再填寫本頁) -5- A7 _ B7_ 五、發明說明（3 ) 梁之前後一方時，則横梁及側梁均容易朝車體中央側彈性 變形，而在車輪定位狀態容易產生偏差。又在此爲將安裝 差速器箱之縱托架之下緣熔接於橫粱之中央部，惟若在此 之橫梁作成形成彈簧支架部，此際，在同彈簧支架部施加 路面反作用力時，則橫梁以該縱托架之接合端部作爲支點 容易朝車體中央側變形，而在車輪定位狀態產生偏差，或 有導致降低耐久性之缺點。 本發明之目的係在於提供一種抑制將彈簧支架部形成 於上端側之傾斜部之變形，適當地保持車輪定位狀態，確 保操縱安定性•並防止降低耐久性的車輛之副車架之構造 c解決課題所用之手段〕 爲了達成上述目的，在申請專利範圍第1項之發明， —種車輛之副車架構造•其特徵爲具備：具被接合固定於 朝車輛之前後方向延設之左右一對的側梁，且經由螺旋彈 簧承受來自車輪之路面反作用力之整形左右一對的彈簧支 架部，及藉同兩彈簧支架部朝車體中央側下方延伸之左右 一對的傾斜部，及形成於同兩傾斜部之下端，且連結有懸 架臂之左右一對的彎曲部，及從同兩彎曲部延伸至車體中 央側之直狀中央部之車寬方向延伸構件，及在同車寬方向 延伸構件之上述兩傾斜部及上述直狀中央部分別接合固定 有端緣，且具安裝有上述車輛之差速裝置之後端之縱板部 的增強板材。 X 297公釐） {靖先閲讀背面之注意事項再填寫本頁) 裝------- -訂--------線 經濟部智慧財產局員工消费合作社印製 -6- A7 B7_ 五、發明說明（4 ) <請先閲讀背面之注f項再填寫本頁> 在此，由於將增強板材之端緣接合固定於將彈簧支架 部形成於上端側之兩傾斜部及直狀中央部，因此即使將彈 簧支架部形成於上端側之兩傾斜部以各弯曲部側作爲支點 朝車體中央側變形*在此之增強扳材也作爲鼓出構件之功 能，可確實地阻止將彈簧支架部形成在上端側之兩傾斜部 互相地接近之變位。爲此，可抑制將彈簧支架部部形成於 上端側之兩傾斜部朝車體中央側之變形，適當地保持車輪 之定位狀態，確保操縱安定性，可防止降低耐久性，而且 能得到增強板材可確實地支撐車輛之差速裝置之零件的共 用化。又由於藉由增強板材強化横梁之剛性，因此可減輕 依橫梁之共振的路面噪聲之發生。 較理想爲，左右一對彈簧支架部鎖緊結合於左右一對 側梁也可以。此際，可將懸架裝置或動力傳動機構之一部 分暫時組裝於橫梁成爲總成化，而可將該分總成化之橫梁 總成裝設於車體，可提高艤裝時之作業性。 在申請專利範圍第2項之發明·係在申請專利範圍第 1項所述之車輛之副車架構造中，具有 經濟部臂慧財產局員工消费合作社印製 上述左右一對之彈簧支架部鎖緊結合於左右一對側梁 ，將一端接合固定於較各彈簧支架部接近車體中宍側並將 另一端鎖緊結合於各側梁或互相地結合同各側梁之橫梁之 左右一對的前後方向延伸構件•並將上述增強板材之左右 側緣接合固定於前.後方向延伸構件之一端。 在此，藉在兩彈簧支架部接合固定前後方向延伸構件 之一端，而在該前後方向延伸構件一端接合固定增強板材 本紙張尺度適用中a國家標準（CNS)A4規格<210 X 297公釐） A7 ___B7 五、發明說明（5 ) <請先閲讀背面之注意事項再填寫本1) 之一端，增強板材作爲鼓出構件可阻止兩彈簧支架部及傾 斜部互相地接近之變位，爲此，可適當地保持車輪之定位 狀態，確保操縱安定性，可防止降低耐久性，特別是，前 後方向延伸構件可強化整體副車架之剛性，在此點也可確 實地防止在車輪之定位狀態產生偏差。 (發明之實施形態） 在第1圖及第2圖表示包含本發明所適用的車輛之副 車架構造之汽車的下部車體構造。 該下部車體構造係在下述下壁構成構件形成安裝部 J 1，J 2，將作爲副車架之底盤構件Ms鎖緊固定於同 安裝部，同下部車體構造，係對於底盤構件M s及其他之 下部構成構件以適當定位狀態安裝後輪W之後輪W的後懸 架裝置S或裝設將驅動力傳動至後輪W之驅動力傳動系統 Ρ Τ之一部分。 經濟部智慧財產局貝工消费合作社印製 下壁構成構件如第2圖所示，將上面與車室CR相對 向之地板材3及接合於同地板材3之下面，如第1圖所示 ，車體前後方向X較長之左右一對之側梁4及一體結合此 等兩側梁間並一起熔接於地板材3之横梁5所構成。橫梁 5係被熔接於左右一對之側梁4之較前方（在第1圖爲上 方）·而前部左右之前安裝部J1形成在自橫梁5之左右 端距所定量較接近於車體中央側。而且在左右一對之側梁 4之較後方（在第1圖爲下方）分別形成有後部左右之後 安裝部J 2。 本纸張尺度適用令國國家標準（CNS>A4規格（210 * 297公« ) • 8 - A7 A7 經濟部智慧財產局霣工消费合作社印製 __B7___ 五、發明說明（6 ) 各安裝部J 1，J 2係均具備將未圖示之鎖緊螺栓上 下方向地插穿的未圖示之螺栓孔，藉插穿於該螺栓孔之螺 栓•鎖緊結合抵接於各安裝部J1， J2下面之底盤構件 M s側之各對向部· 形成本發明所適用的車輛之副車架構造之主要部分之 底盤構件M s係如第3圖所示，朝車寬方向y延設之彎曲 橫梁1及將後端熔接於同彎曲橫梁1之朝前後方向X延設 之左右一對的前後方向延伸構件7所構成· 彎曲橫梁1係如第2圖所示•具備車寬方向延伸構件 1A與端緣分別接合固定於同車寬方向延伸構件之增強板 材8，車寬方向延伸構件1 A係具備：接合固定於兩側梁 4之盤狀左右一對彈簧支架部101 ，及從各彈簧支架部 101朝車體中央側下方分別延伸之左右一對傾斜部 1 0 2 ·及形成於兩傾斜部下端之左右一對彎曲部1 0 3 ，及從兩彎曲部1 0 3朝車體中央側延設之直狀中央部 1 0 4 :在其上面熔接增強構件8。 如第4 (a)圖所示，車寬方向延伸構件1 A係互相 重叠帽形剖k之上板材1 a及平板狀下板材1 b並熔接周 緣部，能形關閉剖面形狀。車寬方向延伸構件1 A之彈簧 支架部1 0 1係將其上板材i a與下板材1 b之兩端成形 於盤形端部，上下地重叠此等俾形成盤形彈簧支架部 1 0 1。該彈簧支架部1 0 1之中央部形成螺栓孔h，該 中央部重叠於左右側梁4之各安裝部J 2，以未圖示之鎖 緊螺栓螺緊固定，左右一對彎曲部1 0 3係在形成有上板 本纸張尺度適用中國國家標準（CNS)A4規格（210 X 297公« > --------- 一^-------—訂 --------線 (諳先W讀背面之注意事項再填寫本頁) -9- 經濟部智慧财產局貝工消费合作社印製 A7 _B7_ 五、發明說明（7 ) 材1 a與下板材1 b之平坦面部下方形成未圖示之朝下凹 部，而在同凹部嵌合作爲懸架臂之下述的下臂1 1之基端 以連結同基端。 增強板材8係朝車寬方向y延伸的板金製構件，由縱 板部8 0 1與從其上緣朝前方彎曲延伸之前延伸部8 0 2 所形成。縱板部8 0 1之左右側緣係被熔接於前後方向延 伸構件7之後端，下緣係連續地被熔接所有左右一對傾斜 部1 0 2及彎曲部1 0 3及直狀中央部1 0 4。前延伸部 8 0 2之左右側緣係被熔接於前後方向延伸構件7之後端 近旁的車體中央側壁，由此，可強化增強板材8本體之剛 性。又，前後方向延伸構件7之後端係將其車體中央側壁 熔接於增強板材8，並將左右車外側壁熔接於左右之彈簧 支架部1 0 1之車體中央側側壁，結果，左右彈簧支架部 101係經由前後方向延伸構件7成爲接合固定於縱板部 8 0 1之左右側緣之狀態。 縱板部8 0 1係朝車寬方向y經由所定間隔將左右一 對差速器安裝孔12(參照第3圖）形成於其中央部。如 第4 (a )圖所示，差速器安裝孔1 2係利用壓入支撐外 筒1 3。該外筒1 3係加硫接合支撐內筒1 4之橡膠襯套 1 5。在內筒1 4之前方對設有驅動力傳動系統PT之差 速器箱1 6。在該差速器箱1 6之後壁突設有輪毅部 1 6 1，藉在形成於該部之螺孔螺裝有插穿內筒1 4之螺 栓1 7，差速器箱1 6之後端安裝於縱板部8 0 1 · 朝前後方向X延設且互相地排設之左右一對前後方向 本紙張尺度適用中國@家標準（CNS)A4規格（210 X 297公釐） -ΙΟ- ' I ---! I I 訂·！ 1 <諝先Mtlt面之注意事項再填寫本頁) A7 4386 93 B7 _ 五、發明說明（8.) 延伸構件7係被熔接於車寬方向延伸構件1A之彈簧支架 1 0 1之車體中央側側壁*並將前端鎖緊固定於横梁5上 之左右一對前安裝部J 1。由於兩前後方向延仲構件7係 各中間部以管構件1 8互相地接合。因此不但左右一對前 後方向延伸構件7本體之剛性被充分強化，而且底盤構件 Ms整體之剛性也被充分強化。在管構件18之左右端近 旁分別熔接有朝下方延伸之左右各一對夾持托架1 9。如 第1圖所示，左右各一對夾持托架1 9係經由未圖示之橡 膠襯套銷結合排設於管構件1 8之下方的中空桿構件2 0 之左右輪毅部2 0 1。在管構件1 8及中空桿構件2 0之 中央部下方配設有差速器箱1 6之前端，而在其前端上部 突出形成左右一對連結輪殼1 6 2〔在第4 ( b )圖僅表 示其中一方〕，連結輪穀162係將其上面重叠於中空桿 構件2 0之下面，而在兩者縱向地貫穿有螺栓2 2，利用 該螺栓與螺帽互相地被鎖緊結合。 後懸架裝置S係將非操向輪之後輪W適當地保持定位 狀態並容許上下移動而連結於車體下部者，具備連桿機構 s 1與衝擊吸收機s 2。 連桿機構s 1係具備樞裝後輪W之轉向節2 5，將該 轉向節2 5側規制前後左右方向之偏差，使用四支懸架臂 可上下移動地連結於車體側•亦即，下臂1 1係分別經由 未圖示之橡膠襯套可轉動地銷結合轉向節2 5與車寬方向 延伸構件1 A之彎曲部1 0 3，上臂2 6係搖動端經由轉 向節2 5與未圓示之球窩關節被結合，而基端經由前後方 本纸張尺度適用中國國家標準（CNS)A4规格（210 X 297公« ) --I II I------ - 48^--- I !訂--晒 I ! I -線 <請先閱讀背面之注意事項再填寫本頁} 經濟部智慧財產局貝工消费合作杜印製 -11- A7 43Θ6 93 ___B7____ 五、發明說明（9 ) 向延伸構件7之前後臂托架2 3，24及分別未圖示之橡 膠襯套可轉動地被銷結合》趾控制臂2 7係分別經由未予 圖示之橡膠襯套可轉動地被銷結合於轉向節2 5及前後方 向延伸構件7側之向下托架2 8，而從動臂2 9 9係分別 經由未圖示之橡膠襯套可轉動地被銷結合於轉向節2 5之 前側端與側梁4之從動臂托架3 0 » 衝擊吸收機構s 2係吸收減低由後輪W所輸入之來自 路面e之反作用力變動成分者，以螺旋彈簧3 1及減震器 3 2所構成。左右之螺旋彈簧1 3係以被壓縮彈壓狀態被 裝設於形成在彎曲橫梁1之彈簧支架部101與下臂11 之下彈簧支架部111之間。左右一對之減霣器32係下 端銷結合在設於下臂1 1內之下端安裝部1 1 2，而上端 經由緩衝構件銷結合在設於車體側之側方縱壁板3 3之上 端安裝部1 3 4 · 在生產裝備包含如上述之彎曲橫梁1之底盤構件M s 之車體時，將連桿機構s 1 *衝擊吸收機構s 2及驅動力 傳動系統ΡΤ之一部分的差速器箱1〇等暫時裝配在底盤 構件M s，作爲底盤總成後供應於生產線。之後，底盤構 件Ms之四個鎖緊部位對設於各安裝部J 1，J 2所形成 的下壁構成構件，此等各對向部以未圖示之鎖緊螺栓依次 被鎖緊結合》 此際，在生產線上組裝經分總成化之底盤構件M s之 作業係被極簡化，而可容易地進行此處之組裝作業*可提 高作業性。而且底盤構件總成側之各零件對於底盤構件 X 297公釐） 1 — — IIJI----J — — I — I 訂·！ (請先Μ讀背面之注意事項再填寫本頁) 經濟部智慧財產局貝工消费合作杜印製 •12- A7 • 9 3 _B7____ 五、發明說明（1〇 ) M s，藉精度優異地事先組裝，可容易地確保艤裝後之組 裝精度* 又在包含上述之底盤構件Ms之車體構造，如第1圖 及第5圖所示，僅距離L上下地偏移彈簧支架部1 0 .1與 彎曲部1 0 3 ·在具有此等車體構造之汽車行駛時•當左 右彈簧支架部1 0 1受到大路面反作力的輸入載重F »則 將其彈簧支架部1 0 1形成於上端側之傾斜部1 0 2與左 右側梁4一起以各彎曲部1 0 3側作爲支點朝車體中央側 被變位彈壓。但是，在此，由於在將彈簧支架部1 0 1形 成於上端側之兩傾斜部1 0 2接合固定增強板材8之左右 側緣，而在直狀中央部1 0 4接合固定下緣，因此即使左 右傾斜部1 0 2側欲變形作動Μ至車體中央側，增強板材 8作爲鼓出構件也可發揮將反作用力R施加於將彈簧支架 部1 0 1形成於上端側之兩傾斜部1 0 2側之功能，可確 實地防止對於兩彈簧支架部101互相地接近之車體中央 側之變形作動Μ。 特別是|包含第1圖之底盤構件M s之車體構造係爲 了適用於越野車，螺旋彈簧3 1.設成較長，且將後輪W之 上下變位行程設成較大，又彈簧支架部1 〇 1與彎曲部 1 0 3之上下方向的偏移量L係被設成較大，惟在此之增 強板材8作爲鼓出構件可確實地阻止將彈簧支架部1〇1 形成於上端側之兩傾斜部1 0 2之變形作動Μ · 爲此，抑制將彈簧支架部1 0 1形成於上端側之左右 兩傾斜部1 0 2對於車體中央側之變形，適當地保持後輪 本紙張尺度適用t S國家標準（CNS)A4規格（210 X 297公釐） — — — — — JJ! · I I 訂.ί ----J . <請先Μ讀背面之注意事項再填寫本頁) 經濟部智慧財產局貝工消费合作社印聚 -13- 4 A7 _B7__ 五、發明說明（11 ) w之定位狀態，可確保操縱安定性，可防止降低耐久性。 又增強板材8可確實地支撐差速器箱1 6，也可保持作爲 差速箱1 6之托架之功能，可得到零件之共用化= 又*由於彎曲横梁1之剛性藉熔接增強板材8成爲一 體化而被強化，因此在有產生底盤構件M s之共嗚可能性 時，可將該共振頻率容易地調整在低頻側，可減低發生依 共嗚之路面噪聲。 又，表示於第2圖及第5圖之底盤構件M s係於兩彈 簧支架部1 0 1接合固定前後方向延伸構件7之後端，又 於該部位接合固定增強板材8之左右側緣，由此經由前後 方向延伸構件7之後端使增強板材8之左右端間接地施加 反作用力於兩彈簧支架部1 0 1，俾阻止兩彈簧支架部 1 0 1互相地接近之變形成動Μ »又構成排除前後方向延 伸構件7，增強板材8之左右端直接將反作用力直接施加 於兩彈簧支架部1 0 1之車體中央側側壁也可以，此時也 可得到與第1圖之底盤構件M s大約同樣之作用效果。 又構成排除前後方向延伸構件7，在彎曲橫梁單體所 構成之底盤構件（未圖示），安裝支撐後懸架裝置S之要 部或差速箱1 6也可以，此時，可得到與第1圖之底盤構 件M s大約同樣之作用效果*並可簡化裝置* 如上所述在包含底盤構件M s之下部車體構造作爲支 撐後懸架裝置S者，替代此，可將本發明適用於前懸架裝 置，及支撐前差速器箱的下部車體構造，此等時，也可得 到與第1圖的車輛之έί車架構造大約同樣之作用效果· 本纸張尺度適用中國國家標準（CNS)A4規格（210 * 297公* > -------------Ϊ 1------1— 訂---------線. (請先W讀背面之注意事項再填寫本I> 經濟部智慧財產局貝工消费合作社印製 -14- 經濟部智慧財產局貝工消费合作社印製 A7 ____B7_ 五、發明說明（〗2 > 上述之副車架構造係鎖緊固定於側梁側之安裝部J1 ’ J 2 ·惟構成將未圖示之副車架構造藉熔接接合固定於 側粱側也可以，此時也可得到與第1圖的車輛之副車架構 造大約同樣之作用效果。 (發明之效果） •在申請專利範圍第1項之發明中，由於將增強板材之 端緣接合固定於將彈簧支架部形成於上端側之傾斜部，因 此該增強板材作爲鼓出構件而可確實地阻止將彈簧支架部 形成在上端側之兩傾斜部互相地接近之變位，爲此，可抑 將左右彈簧支架部形成於上端側之傾斜部朝車體中央側之 變形，適當地保持車輪之定位狀態，確保操縱安定性，可 防止降低耐久性，而且能得到增強板材可確實地支撐車輛 之差速裝置之零件的共用化。又由於藉由增強板材強化橫 梁之剛性，因此可減輕依橫梁之共振的路面噪聲之發生· 較理想爲，左右一對彈簧支架部鎖緊結合於左右一對 側梁也可以》此際*可將懸架裝置或動力傳動機構之一部 分暫時組裝於橫梁成爲總成化，而可將該分總成化之橫梁 總成裝設於車體，可提髙艤裝時之作業性· 在申請專利範圍第2項之發明中，藉在兩彈簧支架部 接合固定前後方向延伸構件之一端，而在該前後方向延伸 構件一端接合固定增強板材之一端•增強板材作爲鼓出構 件可阻止兩彈簧支架部及傾斜部互相地接近之變位•爲此 *可適當地保持車輪之定位狀態，確保操縱安定性，可防 本紙張尺度適用中a固家標準<CNS)A4規格（210 X 297公« ) ---- ------ * ^ — — — — — — — ^« — — — — 1— I (請先《讀背面之注意事項再填寫本頁> •15- 經濟部智懸財產局貝工消费合作社印製 A7 B7____ 五、發明說明（13 ) 止降低耐久性，特別是，前後方向延伸構件可強化整體副 車架之剛性，在此點也可確實地防止在車輪之定位狀態產 生偏差。 (圖式之簡單說明） 第1圖係表示具有作爲本發明之一實施形態例的車輛 之副車架構造之下部車體的主要部分切除平面圖。 第2圖係表示具有第1圖的車輛之副車架構造之下部 車體的主要部分切除後面圖》 第3圖係表示以具有第1圖的車輛之副車架構造之下 部車體之底盤構件的斜視圖。 第4圚係表示具有第1圖的車輛之副車架構造之下部 車體的主要部分：（a)係表示第1圖之A — A線放大剖 面圖：（b)係表示第1圖之B-B線放大剖面圖。 第5圖係表示依具有第1圖的車輛之副車架構造之下 部車體之輸入載重的變形說明圖。 (記號之說明） 1 :彎曲橫梁， 1 A :車寬方向延伸構件， 101:彈簧支架部， 1 0 2 :傾斜部， 1 0 3 :彎曲部， 1 0 4 :直狀中央部， 本紙張尺度適用中國國家標準（CNS)A4規袼（210 X 297公釐） — — — — — J — — — — — - I I I I II I *11!1111 <請先《讀背面之注i項再填寫本頁) * 16 - 43 86 93 A7 __B7 五、發明說明（14 ) 4 :側梁， 7 :前後方向延伸構件| 8:增強板材， 下臂， 差速器箱* 螺旋彈簧， F :輸入載重（路面反作用力） M s :底盤構件（副車架）， S:後懸架裝置| X :前後方向， y :車寬方向， W :後輪 ----------I. . --------訂-I I ----__ (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消费合作社印製 t紙張尺度適用中國國家標準（CNS>A4規格（210 * 297公釐） -17-Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs β ^-2 1 b ···· Α7 _Β7_ V. Description of the invention (1) (Technical field to which the invention belongs) The present invention relates to a sub-frame structure of a vehicle, particularly Yes, about a sub-frame structure of a vehicle that is engaged and fixed to the lower wall of the vehicle's hip, and can support a part of a suspension device or a driving force transmission system ((Prior art) Vehicles such as automobiles are in front of and behind their bodies Each of the left and right sides is individually mounted with a wheel via a suspension device. Here, each wheel transmits a rotational force via a driving force transmission system disposed at a lower portion of the vehicle body. In this way, a suspension device, a driving force transmission system, and the like are provided below the vehicle body. These are floor members that are combined with the lower wall component of the vehicle body through various brackets or sub-frames, and are welded to the same floor member and face the vehicle. A pair of left and right side frames in the front-rear direction of the body are combined with each other and are connected to the same straight beams as the side members while being welded to the floor members. To this end, the lower wall structural members support the suspension with excellent durability and accuracy. Devices, driving force transmission systems and wheels must maintain sufficient strength. However, it is known to couple the left and right side subframes with a pair of left and right side beams provided at the lower part of the vehicle body. In particular, the left and right end joints are connected by left and right inclined portions and between the lower ends of the left and right inclined portions. The shape of the central portion is continuously convex downward. "The sub-frame structure is only shifted up and down between the left and right end joints and the bent portions at the lower ends of the left and right inclined parts. The ends are coupled to each bent portion via a rubber bushing pin. A coil spring is installed between the spring support portion and the center portion of the lower arm. At this time, the paper sizes of the left and right lower arms are in accordance with the Chinese National Standard (CNS) A4 specification (210 X 297 mm) I I --- Jillli '-ills — ^ »— — — — — 1! ΛPlease read first Note on the back, please fill in this page again) -4 Consumption cooperation by employees of the Intellectual Property Bureau of the Ministry of Economic Affairs, printed by η 3, A7 ___B7 _ V. Description of the invention (2> The swinging end is pivoted through the steering knuckle to install the wheel from the road surface of the wheel The reaction force is input to the left and right spring brackets via the lower arm and the coil spring, and the spring brackets are partially supported on the left and right beam sides. An example of these sub-frame structures is disclosed in JP 7-3 1 Bulletin No. 5 2 4 5. Here, the front crossbeam is formed convexly upward and the rear crossbeam is formed convexly downward in the pair of left and right side beams before and after the left and right ends are welded. The beam is elastically deformed toward the center of the vehicle body. In this way, the displacements of the front and rear beams can be equal to each other, so that the deviation of the lower end angle of the wheel will not occur. After this is used, the longitudinal beams of the beams are protruding. To secure the collar above its center (The problem to be solved by the invention) However, in the sub-frame structure in which the spring bracket portion and the bent portion are shifted up and down as described above, if a pair of left and right sides is inclined When the spring bracket part at the upper end of the part receives a large load, the spring bracket part at the upper end of the inclined part is deformed toward the center side of the vehicle body with each bending part side as a fulcrum together with each side beam, and deviations in the positioning state of the wheels are caused * or reduced The problem of the durability of the beam body. Especially in off-road vehicles, since the upper and lower strokes of the wheels are set to be larger and the coil spring is larger, the amount of upward and downward displacement between the spring support portion and the curved portion is increased, and Each side of the bent portion becomes a large zodiac sign as a bracket toward the center of the vehicle body, which causes a large deviation in the positioning of the wheels, which is a problem. It is also disclosed in the vehicle disclosed in Japanese Patent Application Laid-Open No. 7-3 1 5 2 4 5 In the sub-frame structure, the displacement of the front and rear beams is allowed. Only using this type of paper size applies the Chinese National Standard < CNS > A4 Specification (210 * 297 male «> ---------- ---. Outfit! | Order ·! · ≪ First read the note on the back of the emperor's note before filling out this page) -5- A7 _ B7_ V. Description of the invention (3) When the beam is before or after the beam, both the beam and the side beam are easy to elastically deform toward the center of the car body. The alignment of the wheels is prone to deviation. Here again, the lower edge of the longitudinal bracket on which the differential case is mounted is welded to the center of the beam. However, if the beam is formed to form a spring bracket, the same spring When the roadway reaction force is applied to the bracket portion, the cross beam is easily deformed toward the center of the vehicle body using the joint end portion of the longitudinal bracket as a fulcrum, causing deviations in the wheel alignment state, or the disadvantage of reducing durability. It is to provide a means for solving the problem by suppressing the deformation of the inclined portion formed with the spring bracket portion on the upper end side, properly maintaining the wheel alignment state, ensuring the steering stability, and preventing the durability of the sub-frame of the vehicle from reducing the durability. In order to achieve the above-mentioned object, the invention in item 1 of the scope of patent application, a sub-frame structure of a vehicle, is characterized in that it is provided with a device fixed to the front and rear of the vehicle. An extended pair of left and right side beams, and a pair of left and right spring brackets shaped by a coil spring to receive reaction forces from the road surface of the wheel, and a pair of left and right pair of spring brackets extending downward and downward of the center of the vehicle body through the two spring brackets An inclined portion, and a pair of left and right curved portions formed at the lower ends of the same two inclined portions and connected to the suspension arm; and a vehicle width direction extending member extending from the same two curved portions to a straight central portion of the vehicle body center side, And the two inclined parts and the straight central part of the same vehicle width direction extending member are respectively joined and fixed with end edges, and are equipped with the vehicle's differential plate at the rear end of the longitudinal reinforcement plate. X 297 mm) (Jing first read the precautions on the back before filling out this page) Packing --------- -Ordering -------- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-6- A7 B7_ 5. Description of the invention (4) < Please read Note f on the back before filling this page > Here, because the edge of the reinforcing plate is joined and fixed to the two inclined portions forming the spring bracket portion on the upper end side And the straight central part, so even if the two inclined parts of the spring support part are formed on the upper end side and each curved part side is used as a fulcrum to deform toward the center side of the vehicle body, the reinforcing lever material here also functions as a bulging member, which can reliably Grounding prevents displacement of the two inclined portions forming the spring holder portion on the upper end side approaching each other. For this reason, the deformation of the two inclined portions formed on the upper end side of the spring bracket portion toward the center of the vehicle body can be suppressed, the positioning state of the wheel can be appropriately maintained, the steering stability can be ensured, the durability can be prevented from being lowered, and the reinforcing plate can be obtained. It is possible to reliably support the sharing of parts of a differential device for a vehicle. Because the rigidity of the beam is strengthened by reinforcing the plate, the occurrence of road noise that resonates with the beam can be reduced. Preferably, the pair of left and right spring brackets may be locked and coupled to the pair of left and right side members. In this case, a part of the suspension device or the power transmission mechanism can be temporarily assembled on the beam to become an assembly, and the beam assembly can be installed on the vehicle body to improve workability during outfitting. The invention in item 2 of the patent application scope is the sub-frame structure of the vehicle described in item 1 in the patent application scope. It has the above-mentioned pair of left and right spring bracket locks printed by the Consumer Cooperatives of the Ministry of Economic Affairs and Arms Property Bureau. Tightly coupled to a pair of left and right side beams, one end is jointed and fixed closer to the middle side of the car body than each spring bracket part, and the other end is lockedly coupled to each side beam or a left and right pair of cross beams with each side beam Extending member in the front-rear direction • The left and right side edges of the reinforcing plate are joined and fixed to one end of the extending member in the front-rear direction. Here, one end of the extension member in the front-back direction is fixed by joining the two spring bracket portions, and the reinforcing plate is joined and fixed at one end of the extension member in the front-rear direction. This paper is applicable to a national standard (CNS) A4 specification < 210 X 297 mm. ) A7 ___B7 V. Description of the invention (5) < Please read the precautions on the back before filling in one of this 1). The reinforced plate as the bulging member can prevent the two spring brackets and inclined parts from approaching each other. Therefore, it is possible to properly maintain the positioning state of the wheels, ensure the stability of handling, and prevent the reduction of durability. In particular, the extension member in the front-rear direction can strengthen the rigidity of the overall sub-frame, and at this point, the positioning of the wheels can be reliably prevented. State deviation. (Embodiment of the invention) FIGS. 1 and 2 show a lower body structure of an automobile including a sub-frame structure of a vehicle to which the present invention is applied. The lower vehicle body structure is formed with mounting portions J 1 and J 2 on the following lower wall constituent members, and the chassis member Ms as the sub-frame is locked and fixed to the same mounting portion and the lower vehicle body structure, and the chassis member M s The rear suspension device S of the rear wheel W and the rear wheel W are installed in a proper positioning state and other lower components. A part of the driving force transmission system PT that transmits the driving force to the rear wheel W is installed. The printed components of the lower wall are printed by the Shelley Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs as shown in FIG. 2, and the floor plate 3 facing the cabin CR and the lower surface 3 are joined to the same floor plate 3 as shown in FIG. 1. A pair of side beams 4 on the left and right sides of the vehicle body with a long front-rear direction X and a cross beam 5 which is integrally combined between these two side beams and welded to the floor plate 3 together. The cross beam 5 is fused to the front side of the left and right pair of side beams 4 (upper in the first figure). The front left and right front mounting portions J1 are formed closer to the center of the car body from the left and right end distances of the cross beam 5. side. Further, rear left and right rear mounting portions J 2 are formed at the rear of the left and right pair of side beams 4 (below in FIG. 1). This paper size applies the national standard of the country (CNS > A4 size (210 * 297) «) • 8-A7 A7 Printed by the Consumers’ Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs __B7___ V. Description of the invention (6) Each installation department J 1, J 2 series are provided with bolt holes (not shown) through which the lock bolts (not shown) are inserted vertically, and the bolts and locks inserted through the bolt holes are in contact with each of the mounting portions J1, J2. The opposing parts on the underside of the chassis member M s · The chassis member M s forming the main part of the sub-frame structure of the vehicle to which the present invention is applied is a curve extending in the vehicle width direction y as shown in FIG. 3. Beam 1 and a pair of left and right extension members 7 extending in the forward-backward direction X extending from the curved beam 1 are formed. The curved beam 1 is shown in Fig. 2. • The vehicle width direction extension member 1A is provided. Reinforcing plates 8 which are respectively fixed to the same widthwise extension members in the vehicle width direction, and the vehicle width direction extension members 1 A are provided with a pair of disk-shaped left and right spring bracket portions 101 fixed to both side beams 4 and springs The bracket part 101 extends to the left and right of the center side of the vehicle body, respectively. A pair of inclined portions 10 2 · and a pair of left and right curved portions 10 3 formed at the lower ends of the two inclined portions, and a straight central portion 104 extending from the two curved portions 103 toward the center of the vehicle body: The upper surface is welded with the reinforcing member 8. As shown in FIG. 4 (a), the vehicle width direction extending member 1 A is superimposed on the upper plate 1 a and the lower plate 1 b with a hat-shaped cross section k, and is welded to the peripheral edge to be closed in a shape. Cross-sectional shape. The spring support portion 1 1 of the vehicle width direction extension member 1 A is formed by forming both ends of the upper plate ia and the lower plate 1 b at a disc-shaped end portion, which overlaps each other to form a disc-shaped spring support portion. 1 0 1. A bolt hole h is formed in a central portion of the spring bracket portion 101, and the central portion overlaps each of the mounting portions J 2 of the left and right side beams 4, and is fixed with a locking bolt (not shown). The curved part 1 0 3 is formed on the upper plate. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 male «> --------- a ^ ------- —Order -------- line (I read the precautions on the back before filling out this page) -9- Printed by the Shellfish Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs A7 _B7_ V. Description of Invention (7) Material 1 A and the lower plate 1 b form a downward recessed portion (not shown) below the flat surface, and a base end of the lower arm 1 1 described below, which is a suspension arm, is fitted in the same recessed portion to connect the same base end. A sheet-metal member extending in the vehicle width direction y is formed by a longitudinal plate portion 801 and a front extension portion 80 2 which is bent forward from the upper edge thereof. The left and right side edges of the longitudinal plate portion 801 are welded to the front and rear. At the rear end of the direction extending member 7, the lower edge is continuously welded to all of the left and right pair of inclined portions 102 and curved portions 103 and straight central portion 104. The left and right side edges of the front extension 8202 are welded to the center wall of the vehicle body near the rear end of the extension member 7 in the front-rear direction, so that the rigidity of the plate 8 body can be strengthened. Further, the rear end of the front-rear extension member 7 is fused to the center wall of the vehicle body to the reinforcing plate 8, and the left and right outer wall is fused to the center side walls of the left and right spring bracket portions 101. As a result, the left and right spring brackets The portion 101 is in a state of being fixed to the left and right side edges of the vertical plate portion 801 via the front-rear direction extending member 7. The longitudinal plate portion 80 1 is formed with a pair of left and right differential mounting holes 12 (see FIG. 3) in the center of the vehicle width direction y at predetermined intervals. As shown in Fig. 4 (a), the differential mounting holes 12 are press-fitted to support the outer cylinder 13. The outer cylinder 1 3 is a rubber bushing 15 which vulcanizes and supports the inner cylinder 14. A differential case 16 having a driving force transmission system PT is arranged in front of the inner cylinder 14. After the differential case 16 is provided, a round part 16 is provided on the wall. The screw hole formed in the part is provided with a bolt 17 that penetrates the inner cylinder 14 and after the differential case 16 The end is installed on the vertical plate part 8 0 1 · The left and right pair of left and right forward and backward directions extending in the forward and backward direction X and aligned with each other. This paper size applies to China @ 家 standard (CNS) A4 specification (210 X 297 mm) -ΙΟ- 'I ---! II Order! 1 < Notes on the Mtlt surface before filling out this page) A7 4386 93 B7 _ V. Description of the invention (8.) The extension member 7 is a spring bracket 1 0 1 which is welded to the vehicle width direction extension member 1A A pair of left and right front mounting portions J 1 on the central side wall * and locking and fixing the front end to the beam 5. Since the two front-rear extension members 7 are connected to each other, the intermediate portions are joined to each other by the pipe members 18. Therefore, not only the rigidity of the left-right pair of front-rear direction extending members 7 is sufficiently enhanced, but also the rigidity of the chassis member Ms as a whole is sufficiently enhanced. Near the left and right ends of the pipe member 18, a pair of left and right clamping brackets 19 extending downward are respectively welded. As shown in FIG. 1, a pair of left and right clamping brackets 19 is a left and right wheel part 20 of a hollow rod member 20 that is arranged below the pipe member 18 through a rubber bush pin not shown in combination. 1. The front end of the differential case 16 is arranged below the central part of the tube member 18 and the hollow rod member 20, and a pair of left and right connecting wheel shells 1 6 2 are protruded at the upper part of the front end [in the fourth (b) The figure shows only one of them.] The connecting wheel valley 162 is superimposed on the lower part of the hollow rod member 20, and bolts 22 are penetrated in the longitudinal direction of the two, and the bolts and the nuts are locked and combined with each other. The rear suspension device S is a non-steering wheel and a rear wheel W are appropriately positioned and allowed to move up and down, and are connected to the lower part of the vehicle body. The rear suspension device S includes a link mechanism s 1 and an impact absorber s 2. The link mechanism s 1 is provided with a steering knuckle 25 that pivotally mounts the rear wheel W. This steering knuckle 25 regulates deviations in the front, rear, left, and right directions, and is connected to the vehicle body side using four suspension arms to move up and down. The lower arm 1 1 is connected to the knuckle 2 5 and the bending portion 1 3 of the vehicle width direction extending member 1 A through a rubber pin which is not rotatable through a rubber bush. The upper arm 2 6 is a swinging end via the knuckle 2 5 and The ball and socket joints that are not shown are combined, and the base end applies the Chinese National Standard (CNS) A4 specification (210 X 297 male «) through the front and rear of this paper standard --I II I -------48 ^ --- I! Order-Sun I! I-line < Please read the notes on the back before filling out this page} Printed by Shelley Consumer Cooperation, Intellectual Property Bureau, Ministry of Economic Affairs-11- A7 43Θ6 93 ___B7____ V. Invention Explanation (9) The rear arm brackets 2 3, 24 and the rubber bushes (not shown) are rotatably coupled to the extension member 7 respectively. The toe control arms 2 7 are separately accessible through rubber bushes (not shown). The pin is rotatably coupled to the downward bracket 2 8 on the side of the steering knuckle 25 and the front-rear extension member 7, and the follower arms 2 9 9 are respectively through rubbers (not shown). The rubber bush is rotatably coupled to the front side of the steering knuckle 2 5 and the driven arm bracket 3 of the side beam 4 0 »The shock absorbing mechanism s 2 absorbs and reduces the reaction from the road e input by the rear wheel W The force fluctuation component is constituted by a coil spring 31 and a shock absorber 32. The left and right coil springs 13 are installed in a compressed and compressed state between the spring support portion 101 formed on the curved beam 1 and the spring support portion 111 below the lower arm 11. The pair of left and right reducers 32 are connected to the lower end pins 1 1 2 provided in the lower end of the lower arm 11, and the upper ends are connected to the side longitudinal wall panels 3 3 provided on the vehicle body side via the cushion member pins. Upper end mounting portion 1 3 4 · When producing a vehicle body including the chassis member M s of the curved beam 1 as described above, the differential speed of the link mechanism s 1 * impact absorption mechanism s 2 and a part of the driving force transmission system PT The container 10 and the like are temporarily assembled in the chassis member M s and are supplied to the production line as a chassis assembly. After that, the four locking parts of the chassis member Ms are opposite to the lower wall constituent members formed by the mounting portions J 1 and J 2, and the opposing portions are sequentially locked and locked by a locking bolt (not shown). At this time, the operation of assembling the sub-assembly-based chassis member M s on the production line is extremely simplified, and the assembling operation here can be easily performed * to improve workability. And each part of the chassis member assembly side is for the chassis member X 297 mm) 1 — — IIJI ---- J — — I — I Order ·! (Please read the notes on the back before filling in this page.) Printed by the Shellfish Consumer Cooperation Department of the Intellectual Property Bureau of the Ministry of Economic Affairs • 12- A7 • 9 3 _B7____ V. Description of the invention (1〇) M s, with excellent accuracy in advance The assembly can easily ensure the accuracy of the assembly after the assembly. * In the vehicle body structure including the above-mentioned chassis member Ms, as shown in Figs. 1 and 5, the spring support portion is shifted up and down by only 10 from the distance L. 1 and the curved portion 1 0 3 · When driving a car with such a body structure • When the left and right spring bracket portions 1 0 1 receive a large road reaction input load F », the spring bracket portions 1 0 1 are formed in The inclined portion 102 on the upper end side, together with the left and right side beams 4, is elastically displaced toward the center of the vehicle body with the bent portion 103 side as a fulcrum. However, here, the two inclined portions 10 formed on the upper end side of the spring holder portion 101 are joined to the left and right side edges of the reinforcing plate 8, and the lower edge is joined and fixed to the straight central portion 104. Even if the left and right inclined portions 102 are to be deformed and actuated to the center of the vehicle body, the reinforcing plate 8 as a bulging member can exert a reaction force R on the two inclined portions 1 formed with the spring bracket portion 101 and the upper end side. The function of the 0 2 side can reliably prevent the deformation operation M of the center side of the vehicle body where the two spring bracket portions 101 approach each other. In particular, the structure of the car body including the chassis member M s of FIG. 1 is suitable for off-road vehicles. The coil spring 3 is set to be longer, and the upper and lower displacement strokes of the rear wheel W are set to be larger, and the spring The offset amount L in the up-and-down direction of the bracket portion 101 and the bent portion 103 is set to be large, but the reinforcing plate 8 as a bulging member here can surely prevent the spring bracket portion 101 from being formed on the Deformation action M of the two inclined portions 102 on the upper end side. For this reason, the spring bracket portions 101 are formed on the left and right inclined portions 102 on the upper end side. The deformation of the center side of the vehicle body is appropriately maintained, and the rear wheels are appropriately held. This paper size is applicable to the national standard (CNS) A4 specification (210 X 297 mm) — — — — — JJ! · Order II. J. < Please read the precautions on the back before filling (In this page) Yinju, the Intellectual Property Bureau of the Ministry of Economic Affairs of the Bayan Consumer Cooperative, 13- 4 A7 _B7__ V. Description of the invention (11) The positioning state of w can ensure the stability of operation and prevent the reduction of durability. The reinforced plate 8 can reliably support the differential box 16 and can also maintain the function of the bracket of the differential box 16 to obtain the common use of parts = and * due to the rigidity of the curved beam 1 reinforced by welding the plate 8 It is integrated and strengthened. Therefore, when there is a possibility that the resonance of the chassis member M s occurs, the resonance frequency can be easily adjusted to the low frequency side, and the road noise caused by the resonance can be reduced. In addition, the chassis members M s shown in FIGS. 2 and 5 are attached to the rear ends of the two front and rear direction extension members 7 connected to the two spring bracket portions 101, and the left and right side edges of the reinforcing plate 8 are fixed to this portion. This causes the left and right ends of the reinforcing plate 8 to indirectly exert a reaction force on the two spring support portions 1 0 1 through the rear end of the extension member 7 in the front-rear direction, and prevents the two spring support portions 1 0 1 from approaching each other to form movements. Excluding the extension member 7 in the front-rear direction, the left and right ends of the reinforcing plate 8 may directly apply a reaction force to the center side walls of the two spring bracket portions 101, and the chassis member M s as shown in FIG. 1 may also be obtained at this time. About the same effect. It is also possible to construct a chassis member (not shown) made up of a single curved crossbeam, excluding the extension member 7 in the front-rear direction, and the main part of the rear suspension device S or the differential case 16 may also be installed. The chassis member M s of FIG. 1 has approximately the same function effect and can simplify the device. As described above, the vehicle body structure including the lower part of the chassis member M s is used to support the rear suspension device S. Instead of this, the present invention can be applied to the front Suspension device and the lower body structure supporting the front differential case. At this time, the same effect as the frame structure of the vehicle shown in Figure 1 can be obtained. · This paper size applies the Chinese national standard (CNS ) A4 size (210 * 297 male * > ------------- Ϊ 1 ------ 1— order --------- line. (Please W first Read the notes on the back and fill in this I > Printed by the Shellfish Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs -14- Printed by the Shellfish Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ____B7_ V. Description of the invention (〗 2 > The frame structure is fixed to the mounting portion J1 'J 2 on the side beam side. It can also be fixed on the side beam side. At this time, the same effect as that of the sub-frame structure of the vehicle shown in Figure 1 can be obtained. (Effect of the invention) • In the invention of the first scope of the patent application, The end edge of the reinforcing plate is joined and fixed to the inclined portion that forms the spring bracket portion on the upper end side. Therefore, the reinforcing plate as a bulging member can reliably prevent the two inclined portions that form the spring bracket portion on the upper side from approaching each other. Therefore, it is possible to suppress the deformation of the inclined portions formed on the upper end side of the left and right spring brackets toward the center side of the vehicle body, properly maintain the positioning of the wheels, ensure the steering stability, prevent the reduction of durability, and enhance the durability. The plate can surely support the sharing of the parts of the differential device of the vehicle. The rigidity of the beam is strengthened by reinforcing the plate, so the occurrence of road noise due to the resonance of the beam can be reduced. Ideally, a pair of left and right spring brackets It can also be locked and coupled to the left and right side beams. At this time * part of the suspension device or power transmission mechanism can be temporarily assembled on the beam to become the total Chenghua, and the beam assembly of this sub-assembly can be installed on the car body, which can improve the workability during installation. In the invention of the second patent application, the two spring brackets are used to fix and fix One end of the extending member in the front-rear direction, and one end of the extending member is fixed at one end of the extending member. The reinforcing plate serves as a bulging member to prevent the two spring bracket portions and the inclined portion from being moved closer to each other. Maintain the positioning of the wheels to ensure the stability of handling, which can prevent the standard of this paper from being applied to the A & G standard < CNS) A4 specification (210 X 297 male «) ---- ------ * ^ — — — — — — — ^ «— — — — 1— I (Please read the“ Notes on the reverse side before filling out this page ”> 15- Printed by the Shellfish Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, A7 B7____ V. Description of the invention ( 13) The durability is reduced, and in particular, the extension member in the front-rear direction can strengthen the rigidity of the entire sub-frame, and at this point, it is possible to reliably prevent deviations in the positioning state of the wheels. (Brief description of the drawings) Fig. 1 is a cut-away plan view of a main part of a lower body of a sub-frame structure of a vehicle having an embodiment of the present invention. Fig. 2 is a rear view showing the main part of the lower body of the vehicle having the sub-frame structure of Fig. 1 and Fig. 3 is a view of the chassis of the lower body of the vehicle having the sub-frame structure of Fig. 1 An oblique view of the component. Line 4 shows the main part of the lower body of the sub-frame structure of the vehicle with Figure 1. (a) is an enlarged sectional view taken along line A-A in Figure 1: (b) BB line enlarged sectional view. Fig. 5 is an explanatory view showing the deformation of the input load of the lower body of the vehicle having the sub-frame structure of Fig. 1; (Description of Symbols) 1: curved cross member, 1 A: vehicle width direction extension member, 101: spring bracket portion, 102: inclined portion, 103: curved portion, 104: straight central portion, paper Standards are applicable to China National Standard (CNS) A4 (210 X 297 mm) — — — — — J — — — — —-IIII II I * 11! 1111 < (This page) * 16-43 86 93 A7 __B7 V. Description of the invention (14) 4: Side beam, 7: Front-rear extension member | 8: Reinforced sheet, lower arm, differential case * Coil spring, F: Input load (Pavement reaction force) M s: Chassis member (sub-frame), S: Rear suspension device | X: Front-rear direction, y: Vehicle width direction, W: Rear wheel ---------- I.. -------- Order-II ----__ (Please read the notes on the back before filling out this page) The paper size printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs applies to Chinese national standards (CNS > A4 Specifications (210 * 297 mm) -17-