200416166 (1) 玖、發明說明 【發明所屬的技術領域】 本發明是關於機車之鏈條箱構造，在以後端部支承後 輪的車軸的搖臂’安裝從上下夾著該搖臂的上部及下部箱 體’相互連結上部及下部箱體的後端部。 【先前技術】 在搖臂安裝從其上下夾著搖臂的上部箱體及下部箱體 所構成的機車用鏈條箱構造，例如在下述的專利文獻1中 習知的構造。 【專利文獻1】 日本特開平9— 263278號公報 【發明內容】 〔發明欲解決的課題〕 上述習知的鏈條箱構造，是作成全體性地覆蓋用來將 來自於動力單元的旋轉動力傳達到後輪的鏈條，將該上部 及下部箱體安裝於搖臂，構成了所謂的全罩式鏈條箱，上 部及下部箱體的後端連結部，是配置在，通過後輪的車軸 的軸線而朝向搖臂的長軸方向延伸的搖臂中心線的延長處 。也就是說，上部箱體的後端部，是形成爲朝下方繞過搖 臂的後端部，欠缺輕快感。 本發明，鑑於這種情形，其目的要作成一種機車用鏈 條箱構造，是作成全體性地覆蓋鏈條，來將上部及下部箱 -5- (2) 200416166 體安裝於搖臂，以提昇輕快感。 〔用以解決課題的手段〕200416166 (1) 发明. Description of the invention [Technical field to which the invention belongs] The present invention relates to a chain box structure of a locomotive. A swing arm 'supporting an axle of a rear wheel with a rear end portion is attached to the upper and lower portions of the swing arm, The cabinets' interconnect the rear end portions of the upper and lower cabinets. [Prior Art] A locomotive chain box structure constituted by mounting an upper case and a lower case sandwiching the swing arm from above and below the swing arm is, for example, a structure known in Patent Document 1 described below. [Patent Document 1] Japanese Patent Application Laid-Open No. 9-263278 [Summary of the Invention] [Problems to be Solved by the Invention] The above-mentioned conventional chain box structure is constructed so as to cover the entirety to transmit the rotational power from the power unit to The chain of the rear wheel is a so-called full-cover chain box by attaching the upper and lower cases to the rocker arm. The rear end joints of the upper and lower cases are arranged through the axis of the rear wheel axle. Extension of the centerline of the rocker arm that extends toward the long axis of the rocker arm. That is, the rear end portion of the upper case is formed so as to bypass the rear end portion of the swing arm downward, and lacks lightness. In view of this situation, the present invention aims to create a chain box structure for a locomotive, which is to cover the chain as a whole, so that the upper and lower boxes are attached to the rocker arm to enhance lightness. . [Means for solving problems]
爲了達成上述目的，第1發明，是在以後端部支承後 輪的車軸的搖臂，安裝從上下夾著該搖臂的上部及下部箱 體’相互連結上部及下部箱體的後端部的機車之鏈條箱構 造’上述上部及下部箱體的後端連結部，是偏置配置到， 通過上述車軸的軸線而延伸於搖臂的長軸方向的搖臂中心 線的更上方處。 藉由該第1發明的構造，由於上部及下部箱體的後端 連結部，是配置在搖臂中心線的更上方，當從側面來看鏈 條箱全體時，會呈現鏈條箱的後部向後上方揚起的外觀， 而能夠得到具有輕快感的外觀。In order to achieve the above object, the first invention is a swing arm that supports an axle of a rear wheel at a rear end portion, and a rear end portion of the upper and lower casings that connects the upper and lower casings sandwiching the rocker arm from above and below is attached. The chain box structure of the locomotive. The rear-end connecting portions of the upper and lower cases are offset and arranged above the center line of the rocker arm extending in the long axis direction of the rocker arm through the axis of the axle. With the structure of the first invention, since the rear end connecting portions of the upper and lower cases are disposed above the center line of the rocker arm, when the entire chain case is viewed from the side, the rear portion of the chain case appears rearward and upward. The raised appearance makes it possible to obtain an appearance with lightness.
第2發明，是針對上述第1發明，上述上部及下部箱 體的後端連結部的前端，是配置在較搖臂的後端更前方， 藉由這種構造，讓下部箱體的後端形成爲朝上方繞過搖臂 的後端部，則可更提昇輕快感，且當上部箱體對搖臂進行 安裝時，可將下部箱體的後端部利用爲導引部，而能夠提 高組裝性。 第3發明，是針對上述第1或2發明的構造’上述上 部及下部箱體，是將顏色加以區別，讓相互間的明暗的差 異變大，藉由這種構造，而可得到更具輕快感的外觀。 【實施方式】 -6- (3) (3) 200416166 以下根據附圖所示的本發明的一實施例來說明本發明 的實施方式。 第1圖〜第4圖是顯示本發明的一實施例，第1圖是 機車的側面圖，第2圖是鏈條箱的放大側面圖，第3圖是 第2圖的3 — 3線放大剖面圖，第4圖是第2圖的4 一 4線 放大剖面圖。 首先在第1圖中，該機車的車體框架5，是具備有： 可轉向地支承前叉9的頭管6、從該頭管6朝後下方延伸 的主框架7、以及連接設置於主框架7的後部且朝後上方 延伸的左右一對的後框架8 ··，在上述前叉9的下端軸 支承著前輪WF，在前叉9的上部連結著桿狀的轉向車把 1〇，在前叉9，支承著用來覆蓋前輪WF的上方的前擋泥 板1 1。 在主框架7的中間部兩側面分別固定安裝著懸架板 1 2 ·.，在主框架7的後部兩側面固定安裝著樞支板1 3 。在主框架7的下方，是配置有將缸體軸線稍微作成朝向 前上方的引擎E，該引擎E，是以上述懸架板1 2 ..及樞 支板1 3支承而被懸架於車體框架5。 在上述樞支板1 3，是可上下擺動地支承著後叉1 4的 前端部，在後叉1 4的後端部是支承著後輪WR的車軸1 5 。在車體框架5的後框架8 ··及後叉1 4之間是設置有 後避震器1 6。 在後輪WR的上方的後框架8 · ·，是支承著：油箱 1 7、以及配置在該油箱1 7的前方的置物箱1 8，油箱1 7 (4) (4)200416166 及上述油箱1 7的上方，是以例如雙人乘坐型的乘車用座 墊1 9可開閉地覆蓋著。 在車體框架5，是安裝著用來覆蓋：該車體框架5、 上述引擎E的一部分、油箱1 7及置物箱1 8等的合成樹脂 製的車體外殼2 0，該車體外殼2 0，是由：配置於主框架 7的左右兩側的前側外殼2 1 .·、用來從前方覆蓋駕駛者 的腳部而連接於兩前側外殼2 1 ··的前部的腿部護罩2 2 • ·、用來從前方覆蓋頭管6而連接於兩腿部護罩22 · •的最前部外殼23、從後方側覆蓋頭管6且從上方覆蓋 主框架7而與最前部外殼23相連的主框架上外殼24、與 上述兩前側外殼2 1 ··的下部相連的下外殼2 5 ··、以 及從兩側覆蓋油箱1 7及置物箱1 8的後側外殻26所構成 〇 上述乘車用座墊1 9，是作成可開閉地配置在後側外 殻26的上部，以致能對置物箱1 8進行物品的收容及取出 ，且可對油箱1 8進行供油，用來覆蓋後輪WR的後部上 方的後擋泥板2 7是連接設置於後側外殻2 6。 上述引擎E，是與變速器Μ —起構成了動力單元 Ρ，變速器Μ的輸出會經由鏈條2 8而被傳達到後輪WR。 也就是說，在固定於變速器Μ的輸出軸29的驅動鏈輪3 〇 、與安裝於後輪WR的從動鏈輪3 1，是繞掛著循環式的 鏈條28。 合倂參照第2圖及第3圖，後叉14 ’是具備有：形 成爲橫剖面是矩形筒狀且配置在後輪WR的左右兩側的〜 (5) (5)200416166 對搖臂1 4a ··，在車體框架5的樞支板1 3，是經由水平 的樞軸3 2而可上下擺動地支承著後叉1 4的前端部。 後輪W R的輪轂3 3，是經由左右的一對滾珠軸承3 4 • •而可自由旋轉地被支承在車軸1 5，在兩滾珠軸承3 4 • •的內輪之間，是中介安裝著圍繞車軸1 5的圓筒狀的 內側輪軸環3 5。 在輪轂3 3的左端部，是經由緩衝橡膠3 7來連結著鏈 輪座36，在該鏈輪座36是藉由複數的螺栓38..及螺母 3 9 ··鎖裝著上述從動鏈輪3 1。而鏈輪座3 6，是使其中 ~端的內端抵接於上述兩滾珠軸承3 4 ..中的左側的滾 珠軸承3 4的內輪外端，而經由滾珠軸承4 1可自由旋轉地 被支承於圍繞車軸1 5的圓筒狀的外側輪軸環4 0。 在左側的搖臂1 4a，在對應於上述鏈輪座3 6的部分 的內側外面部，是焊接著具有由該搖臂1 4 a朝上下伸出的 箱體安裝部42a、42b的後部安裝板42，在該後部安裝板 4 2與上述滾珠軸承4 1的內輪外端之間，中介安裝著圍繞 上述外側輪軸環40的圓筒狀的襯套44，在上述滾珠軸承 4 1的外側，在鏈輪座36及襯套44之間，是中介安裝著 環狀的密封構件45。藉此，將後輪WR的輪轂3 3的左端 部及左側的搖臂1 4a之間的間隔設定成爲一定，來防止塵 埃及水由左側侵入到上述輪轂3 3側。 另一方面，將右側的搖臂及上述輪轂3 3的右端部之 間的間隔設定成爲一定，來防止塵埃及水由右側侵入到上 述輪轂3 3側。 -9- (6) 200416166 安 4 7 上 搖 可 車 是 繞 40 兩 鎖 接 雖 側 車 在 是 在左側的搖臂1 4a的後端部的左右兩側及上述後部 裝板4 3，分別設置有前後方向較長的長孔部4 6、4 6、 ，在右側的搖臂的後端部的左右兩側，也分別設置有與 述長孔部4 6 ··同樣的長孔（沒有圖示）。在左側的 臂14a及上述後部安裝板43的長孔部46、46、47，是 朝前後方向移動地插通著車軸1 5的左端部、及圍繞於 軸1 5的左端部的外側輪軸環40 · β ，在右側的搖臂， 可朝前後方向移動地插穿著車軸1 5的右端部、以及圍 車軸1 5的右端部的外側輪軸環。 在由兩搖臂1 4 a ··的後端部起的上述外側輪軸環 • •的突出部，是分別螺合著螺母48 · ·，藉由在與 搖臂1 4 a ··的後端部外側面之間夾著墊片4 9 · ·然後 裝上述螺母48 · ·，將沿著前後方向也就是搖臂i4a · 的長軸方向的車軸1 5的位置定位在一定的位置。 另一方面，在車軸15的左端部，是一體形成有抵 、卡合於左側的外側輪軸環40的外端的大頭部1 5a， 然沒有圖示’在車軸1 5的右端部是螺合著與右側的外 輪軸環的外端抵接、卡合的螺母，藉由鎖裝該螺母，讓 軸1 5被支承在兩搖臂} 4 a ••的後端部之間。 並且’在兩搖臂1 4 a ··內，在上述外側輪軸環4 0 •’是固定安裝著可滑動於搖臂14a ••內的滑塊5〇· ’削端部連結在該滑塊5 0 ··的螺栓5 1 ··的後端部 是可朝軸方向移動地貫穿各搖臂i 4a ••的後端壁部， 由搖臂1 4 a .·的後端壁部起的螺栓5 1 ··的突出部， -10- (7) 200416166 分別螺合著一對螺母5 2、5 3。在放鬆上述螺母4 8 ..的 狀態，藉由放鬆上述螺母5 2、5 3，可以調節車軸1 5的前 後方向位置而可以調節鏈條2 8的張力。 合倂參照第4圖，在後叉1 4的左側的搖臂1 4a，是 安裝著從上下夾住該搖臂1 4 a的上部及下部箱體5 4、5 5The second invention is directed to the above-mentioned first invention. The front ends of the rear end connecting portions of the upper and lower cases are disposed more forward than the rear ends of the swing arms. With this structure, the rear ends of the lower cases are arranged. It is formed to bypass the rear end portion of the swing arm upwards, which can further enhance the lightness. When the upper case is installed on the swing arm, the rear end portion of the lower case can be used as a guide, which can improve Assembly. The third invention is directed to the structure of the above-mentioned first or second invention. The above-mentioned upper and lower cases are distinguished from each other in color so that the difference between light and shade between them is large. With this structure, lighter weight can be obtained. Pleasant appearance. [Embodiment] -6- (3) (3) 200416166 The following describes an embodiment of the present invention with reference to an embodiment of the present invention shown in the drawings. 1 to 4 are diagrams showing an embodiment of the present invention. FIG. 1 is a side view of a locomotive, FIG. 2 is an enlarged side view of a chain case, and FIG. 3 is an enlarged cross-section taken along line 3-3 of FIG. 2. FIG. 4 is an enlarged cross-sectional view taken along the line 4-4 in FIG. 2. First, in the first figure, the body frame 5 of the locomotive is provided with a head pipe 6 that can steerably support the front fork 9, a main frame 7 that extends from the head pipe 6 to the lower back, and is connected to the main body. A pair of left and right rear frames 8 at the rear of the frame 7 and extending rearward and upward, is supported on the lower end of the front fork 9 by a front wheel WF, and a rod-shaped steering handlebar 10 is connected to the upper portion of the front fork 9, The front fork 9 supports a front fender 11 for covering the front wheel WF. Suspension plates 1 2 ·. Are fixedly mounted on both sides of the middle portion of the main frame 7, and pivot support plates 1 3 are fixedly mounted on both sides of the rear portion of the main frame 7. Below the main frame 7, an engine E having a cylinder axis slightly facing forward is arranged. The engine E is supported by the suspension plate 1 2... And the pivot plate 13 and is suspended from the body frame. 5. The pivot support plate 13 supports a front end portion of the rear fork 14 in a swingable manner, and a rear end portion of the rear fork 14 includes an axle 15 supporting a rear wheel WR. A rear shock absorber 16 is provided between the rear frame 8 of the vehicle body frame 5 and the rear forks 14. A rear frame 8 above the rear wheel WR supports a fuel tank 17 and a storage tank 18 arranged in front of the fuel tank 17 and a fuel tank 17 (4) (4) 200416166 and the fuel tank 1 described above. The upper part of 7 is covered with, for example, a passenger seat cushion 19 that can be opened and closed. The body frame 5 is mounted with a synthetic resin body shell 20 for covering the body frame 5, a part of the engine E, the fuel tank 17 and the storage box 18, and the like. 0 is caused by the front housings 2 1 arranged on the left and right sides of the main frame 7, and the leg shields connected to the front of the two front housings 2 1 ·· to cover the driver's feet from the front 2 2 • · Foremost case 23 for covering the head pipe 6 from the front and connected to the two leg shields 22 · • Foremost case 23 covering the head pipe 6 from the rear side and covering the main frame 7 from above and the foremost case 23 The main frame upper case 24 is connected, the lower case 2 5 is connected to the lower part of the two front side cases 2 1, and the rear case 26 covers the fuel tank 17 and the storage box 18 from both sides. The above-mentioned passenger seat cushion 19 is configured to be openable and closable and arranged on the upper part of the rear case 26 so that the storage box 18 can store and remove articles, and can supply fuel to the fuel tank 18 for The rear fender 27 covering the rear part of the rear wheel WR is connected to the rear case 26. The above engine E constitutes a power unit P together with the transmission M, and the output of the transmission M is transmitted to the rear wheel WR via the chain 28. That is, the drive sprocket 3 0 fixed to the output shaft 29 of the transmission M and the driven sprocket 31 1 attached to the rear wheel WR are wound around a circulating chain 28. Referring to FIG. 2 and FIG. 3, the rear fork 14 ′ is provided with: a rectangular tube having a horizontal cross section and disposed on the left and right sides of the rear wheel WR ~ (5) (5) 200416166 pair of rocker arms 1 4a ..., the pivot support plate 13 of the vehicle body frame 5 supports the front-end part of the rear fork 14 so that it can swing up and down via the horizontal pivot 32. The hub 3 3 of the rear wheel WR is supported rotatably on the axle 15 via a pair of left and right ball bearings 3 4 •, and is interposed between the inner wheels of the two ball bearings 3 4 • • A cylindrical inner wheel collar 3 5 surrounding the axle 15. At the left end of the hub 33, a sprocket seat 36 is connected via a cushion rubber 37, and the sprocket seat 36 is locked with a plurality of bolts 38 .. and nuts 3 9... Round 3 1. The sprocket seat 36 is such that the inner end of the ~ end is in contact with the outer end of the inner wheel of the left ball bearing 3 4 of the two ball bearings 3 4 .., and is freely rotatable through the ball bearing 41. It is supported by a cylindrical outer wheel collar 40 surrounding the axle 15. The rocker arm 14a on the left side is attached to the rear portion of the housing corresponding to the above-mentioned sprocket seat 36 by welding the rear parts having box mounting portions 42a and 42b protruding upward and downward from the rocker arm 14a. A plate 42 is interposed between the rear mounting plate 42 and the outer end of the inner ring of the ball bearing 41, and a cylindrical bush 44 surrounding the outer wheel collar 40 is mounted on the outer side of the ball bearing 41. Between the sprocket seat 36 and the bushing 44, a ring-shaped sealing member 45 is interposed. Thereby, the interval between the left end portion of the hub 33 of the rear wheel WR and the left rocker arm 14a is set to be constant to prevent dust and water from entering the hub 33 side from the left side. On the other hand, the interval between the right rocker arm and the right end of the hub 33 is set constant to prevent dust and water from entering the hub 33 from the right side. -9- (6) 200416166 An 4 7 The upper swing can be around 40. The two side locks are on the left and right sides of the rear end of the swing arm 1 4a on the left and the rear mounting plate 4 3 respectively. There are long holes 4 6, 4 6, in the front-rear direction, and left and right sides of the rear end portion of the right-hand rocker arm are also provided with the same long holes as the long hole 4 6 (not shown) Show). The left arm 14a and the long hole portions 46, 46, and 47 of the rear mounting plate 43 are inserted through the left end portion of the axle 15 and the outer wheel collar around the left end portion of the shaft 15 so as to move forward and backward. 40 · β, the right arm of the right arm can be inserted into the right end of the axle 15 and the outer wheel collar around the right end of the axle 15 so as to be movable in the front-rear direction. The protruding parts of the outer wheel collars from the rear ends of the two rocker arms 1 4 a ·· are screwed with nuts 48 ·· respectively, and are connected to the rear ends of the rocker arms 1 4 a ·· A washer 4 9 is sandwiched between the outer surfaces of the part, and then the above-mentioned nut 48... Is installed, and the position of the axle 15 in the longitudinal direction of the rocker arm i4a. On the other hand, at the left end portion of the axle 15, a large head portion 15a integrally formed with the outer end of the outer wheel collar 40 that is engaged with the left side is integrally formed. The nut abuts and engages with the outer end of the outer wheel collar on the right, and locks the nut so that the shaft 15 is supported between the rear ends of the two rocker arms} 4 a ••. In addition, 'in the two rocker arms 1 4 a ·, and in the outer wheel collar 4 0 ·' above, a slider 50 which is slidable in the rocker arm 14 a •• is fixedly mounted, and the cut end is connected to the slider The rear end of the bolt 5 1 ·· 5 1 ·· is axially movable through the rear end wall portion of each rocker arm i 4a ·· from the rear wall portion of the rocker arm 1 4 a. The projections of the bolts 5 1 ··· (7) 200416166 are screwed into a pair of nuts 5 2 and 5 3 respectively. In a state where the nuts 4 8... Are loosened, by loosening the nuts 5 2, 5 3, the front-rear position of the axle 15 can be adjusted and the tension of the chain 28 can be adjusted. With reference to FIG. 4, the swing arm 14 a on the left side of the rear fork 14 is attached to the upper and lower cases 5 4 and 5 5 that sandwich the swing arm 1 4 a from above and below.
上部箱體5 4，是把以薄鋼板沖壓成形的表板5 6及背 板5 7接合，作成具有朝下方開口的略U字型的橫剖面形 狀，下部箱體5 5，是把以薄鋼板沖壓成形的表板5 8及背 板59接合，作成具有朝上方開口的略U字型的橫剖面形 狀The upper case 5 4 is formed by joining a front plate 56 and a back plate 57 which are formed by punching a thin steel plate to form a U-shaped cross-sectional shape that opens downward. The lower case 5 5 is made of thin The sheet metal plate 58 and the back plate 59 formed by pressing a steel plate are joined to form a U-shaped cross-sectional shape that opens upward.
爲了安裝上部及下部箱體54、55，在對應於上述鏈 輪座3 6的部分’在搖臂1 4 a的內側外面部焊接著上述後 部安裝板4 2，並且在搖臂1 4 a的靠近前端的部分的內側 外面部，是焊接著具有從該搖臂1 4a朝上下伸出的箱體安 裝部 4 3 a、4 3b。 在後部安裝板42的箱體安裝部42a、42b，是固定安 裝著焊接螺母61、62，是藉由將插穿於上部箱體54的表 板56的後側下部的螺栓63螺合鎖裝於上述焊接螺母6 1 ，上述表板5 6的後側下部’會以從外側覆蓋箱體安裝部 42a的方式，被安裝於該箱體安裝部42a。藉由將插穿於 下部箱體5 5的表板5 8的後側上部的螺栓64螺合鎖裝於 上述焊接螺母62 ’上述表板5 8的後側上部，會以從外側 覆蓋箱體安裝部42b的方式，被安裝於該箱體安裝部42b -11 - (8) (8)200416166 藉由將插穿於上部箱體5 4的表板5 6的後側下部的螺 栓6 5螺合鎖裝於固定安裝在前部安裝板4 3的箱體安裝部 4 3 a的焊接螺母（沒有圖示），上述表板5 6的前側下部 ’會以從外側覆蓋箱體安裝部43a的方式，被安裝於該箱 體安裝部4 3 a。藉由將插穿於下部箱體5 5的表板5 8的後 側上部的螺栓6 6螺合鎖裝於固定安裝在前部安裝板4 3的 箱體安裝部4 3 b的焊接螺母（沒有圖示），上述表板5 8 的前側上部，會以從外側覆蓋箱體安裝部43b的方式，被 安裝於該箱體安裝部43b。 在較上述後部安裝板42更前方，在上述搖臂14a的 後部上面部，是焊接著朝上方開口的略U字型的托架67 ’在該托架6 7的內側是固定安裝著焊接螺母6 8。並且， 在托架67內是插入著後避震器16的下端部，藉由將插通 於托架67及後避震器1 6的下端部的螺栓69螺合鎖裝於 上述焊接螺母6 8，來將後避震器1 6的下端部連結於搖臂 1 4 a的後部。 上部及下部箱體54、5 5的後端部，例如是將下部箱 體54的表板58的後端部重疊於上部箱體54的表板56的 內側，並且將下部箱體5 4的背板5 9的後端部重疊在上部 箱體54的背板57的內側，而相互連結，上部及下部箱體 5 4、5 5的後端連結部7 0，是偏置配置到，通過後輪W R 的車軸1 5的軸線而延伸於搖臂1 4 a的長軸方向的搖臂中 心線C的更上方處。 -12- (9) (9)200416166 並且，上部及下部箱體54、55的後端連結部70的前 端，是配置在較搖臂1 4 a的後端更前方處，上述後端連結 部70，是配置成隨著朝向後方而成爲上方的位置。 上部及下部箱體54、55，是藉由塗裝或電鍍等方式 著色，將顏色區分成讓上部及下部箱體54、5 5之間的明 暗差異很大，在該實施例中，上部箱體5 4側是將顏色區 分成較下部箱體5 5側更明亮的顏色。例如上部箱體5 4著 色爲銀色時，下部箱體55則著色成黑色。而搖臂14a也 著色成較下部箱體5 5更明亮的顏色，例如著色成銀色。 第1圖及第2圖，爲了顯示下部箱體55是暗色，而 在下部箱體5 5上實施描點處理，該描點處理並不是實際 在下部箱體5 5上進行。 接下來針對該實施例的作用來加以說明，安裝於後叉 14的搖臂14a而從上下夾著搖臂14a的上部及下部箱體 5 4、5 5的後端連結部7 0，是偏置配置到，通過後輪w R 的車軸15的軸線而延伸於搖臂1 4 a的長軸方向的搖臂中 心線C的更上方處，所以當從側邊來看由上部及下部箱體 5 4、5 5所構成的鏈條箱全體時，會呈現鏈條箱的後部朝 後上方揚起的外觀，可以得到與半罩式鏈條箱同樣的輕快 感的外觀。 上部及下部箱體5 4、5 5的後端連結部7 0的前端，是 配置在較搖臂1 4a的後端更前方處，所以下部箱體5 5的 後端是形成爲朝上方繞過搖臂1 4a的後端部，可更提昇輕 快感。 -13- (10) 200416166 在將上部箱體5 4對搖臂丨4 a進行安裝時，將下部 體5 5的後端部利用爲導引部則可提高組裝性。並且， 部及下部箱體5 4、5 5的後端部，是將下部箱體5 4的表 5 8的後端部重覺於上部箱體5 4的表板5 6的內側，並 將下部箱體5 4的背板5 9的後端部重疊在上部箱體5 4 背板5 7的內側，來加以連結，所以在將下部箱體5 5對 臂1 4a進行安裝之後，藉由將上部箱體54的後端部重 於下部箱體5 5的後端部，則容易進行上部箱體5 4對搖 1 4 a的安裝操作，而能將上部箱體5 4保持於下部箱體 ’可更提高上部箱體54對搖臂1 4a的組裝性。 上部及下部箱體5 4、5 5，是將顏色加以區別，讓 互間的明暗的差異變大，例如上部箱體54側成爲較下 箱體5 5側更明亮的顏色，藉由區分顏色將彼此的明暗 異變大，而可得到更具輕快感的外觀。 以上說明了本發明的實施方式，本發明並不限定於 述實施方式，只要不脫離本發明的專利範圍，則可進行 種設計變更。 例如在上述實施例中，雖然上部及下部箱體5 4、 是由薄鋼板構成的，而也可藉由合成樹脂分別形成上部 下部箱體。在這種情況，上部及下部箱體的著色並不限 於塗裝方式，藉由使用著色劑、或拉深處理，則可廉價 實現上部及下部箱體的表面的嶄新表現。 也可以作成讓上部箱體5 4較下部箱體5 5更亮且加 明暗的對比。 箱 上 板 且 的 搖 疊 臂 5 5 相 部 差 上 種 5 5 及 定 地 上 -14- (11) 200416166 〔發明效果〕 藉由第1發明，當從側面來看鏈條箱全體時，會呈現 鏈條箱的後部向後上方揚起的外觀，而能夠得到具有輕快 感的外觀。In order to install the upper and lower cases 54, 55, the above-mentioned rear mounting plate 4 2 is welded to the inner and outer portions of the rocker arm 1 4 a at a portion corresponding to the above-mentioned sprocket seat 36, and The inner and outer portions of the portion near the front end are welded with the box mounting portions 4 3 a and 4 3b that extend upward and downward from the rocker arm 14 a. The box mounting portions 42 a and 42 b of the rear mounting plate 42 are fixedly mounted with the welding nuts 61 and 62, and are screwed and locked by bolts 63 inserted in the lower portion of the rear side of the face plate 56 of the upper box 54. On the welding nut 6 1, the lower portion ′ on the rear side of the watch plate 56 is mounted on the box mounting portion 42 a so as to cover the box mounting portion 42 a from the outside. The bolts 64 inserted into the upper part of the rear side of the lower plate 5 5 of the lower case 5 5 are screw-locked to the welding nut 62 ′. The upper part of the rear side of the upper plate 5 8 covers the box from the outside. The mounting portion 42b is mounted to the box mounting portion 42b. -11-(8) (8) 200416166 The bolt 6 5 is inserted into the lower portion of the rear side of the upper plate 5 4 of the upper plate 5 4 Welding nuts (not shown) that are fixedly mounted on the case mounting portion 4 3 a fixed to the front mounting plate 4 3. The lower part of the front side of the above-mentioned plate 5 6 will cover the case mounting portion 43 a from the outside. Method, it is attached to this case mounting part 4 3 a. The bolts 6 6 inserted into the upper upper part of the rear side of the lower plate 5 5 of the lower case 5 5 are screw-locked to the welding nuts of the case mounting portion 4 3 b fixedly mounted to the front mounting plate 4 3 ( (Not shown), the upper part of the front side of the watch plate 5 8 is mounted on the box mounting portion 43 b so as to cover the box mounting portion 43 b from the outside. A slightly U-shaped bracket 67 'is welded to the upper surface of the rear portion of the rocker arm 14a at a position further forward than the rear mounting plate 42. A welding nut is fixedly mounted inside the bracket 67. 6 8. The lower end portion of the rear shock absorber 16 is inserted into the bracket 67, and the bolts 69 inserted into the lower end portions of the bracket 67 and the rear shock absorber 16 are screwed and locked to the welding nut 6. 8, to connect the lower end portion of the rear shock absorber 16 to the rear portion of the swing arm 14a. The rear end portions of the upper and lower cases 54 and 55 are, for example, the rear end portion of the face plate 58 of the lower case 54 is overlapped with the inside of the face plate 56 of the upper case 54 and the lower case 54 is The rear end portion of the back plate 59 is superposed on the inner side of the back plate 57 of the upper case 54 and is connected to each other. The rear end connection portions 70 of the upper and lower cases 5 4 and 5 5 are offsetly arranged to The axis of the axle 15 of the rear wheel WR extends above the center line C of the rocker arm in the long axis direction of the rocker arm 14a. -12- (9) (9) 200416166 Further, the front ends of the rear end connecting portions 70 of the upper and lower cases 54, 55 are disposed more forward than the rear ends of the rocker arms 1 4a. 70 is a position arrange | positioned so that it may become upward as it goes back. The upper and lower cases 54 and 55 are colored by painting or electroplating, and the colors are divided so that the light and dark differences between the upper and lower cases 54 and 55 are very large. In this embodiment, the upper cases The body 5 4 side distinguishes colors into brighter colors than the lower case 5 5 side. For example, when the upper case 54 is colored silver, the lower case 55 is colored black. The rocker arm 14a is also colored brighter than the lower case 55, for example, it is colored silver. In FIGS. 1 and 2, in order to show that the lower case 55 is dark, the lower case 55 is subjected to a spotting process. This spotting process is not actually performed on the lower case 55. Next, the function of this embodiment will be described. The swing arm 14a mounted on the rear fork 14 sandwiches the upper end of the swing arm 14a and the rear end connecting portions 70 of the lower case 5 4 and 5 5 from above and below. It is arranged so that it passes above the axis of the axle 15 of the rear wheel w R and extends above the center line C of the swing arm 14 a in the long axis direction of the swing arm 14 a. Therefore, when viewed from the side, the upper and lower cases When the entire chain box composed of 5 4 and 5 5 has the appearance that the rear part of the chain box is raised upward and rearward, the same brisk appearance as the half-cover type chain box can be obtained. The front ends of the rear end connecting portions 70 of the upper and lower cases 5 4 and 5 5 are arranged more forward than the rear end of the swing arm 14 a. Therefore, the rear ends of the lower cases 5 5 are formed to wind upward. Passing the rear end of the swing arm 14a can enhance the lightness. -13- (10) 200416166 When the upper case 5 4 is mounted on the swing arm 丨 4 a, the rear end of the lower body 5 5 can be used as a guide to improve the assemblability. In addition, the rear ends of the lower case 5 4 and 5 5 are made by accentuating the rear end of the table 5 8 of the lower case 5 4 on the inner side of the watch plate 5 6 of the upper case 5 4 and The rear end of the back plate 5 9 of the lower case 5 4 is overlapped with the inner side of the upper case 5 4 and the back plate 5 7 to be connected. Therefore, after mounting the lower case 5 5 to the arm 1 4a, When the rear end portion of the upper case 54 is heavier than the rear end portion of the lower case 55, the installation operation of the upper case 5 4 pairing 1 4 a is easy, and the upper case 54 can be held in the lower case. The body 'can further improve the assemblability of the upper case 54 to the swing arm 14a. The upper and lower cabinets 5 4 and 5 5 distinguish the colors and make the difference between light and dark. For example, the upper cabinet 54 becomes a brighter color than the lower cabinet 5 5. By increasing the difference between each other's light and shade, you can get a more light look. The embodiments of the present invention have been described above, and the present invention is not limited to the above-mentioned embodiments. Various design changes can be made without departing from the patent scope of the present invention. For example, in the above embodiment, although the upper and lower cases 54 are made of thin steel plates, the upper and lower cases may be formed by synthetic resins, respectively. In this case, the coloring of the upper and lower cases is not limited to the painting method. By using a colorant or a deep drawing treatment, a new expression of the surface of the upper and lower cases can be realized at a low cost. It can also be made to make the upper case 5 4 brighter and darker than the lower case 55. The upper arm of the box is 5 5 and the phase difference is 5 5 and the ground is -14- (11) 200416166 [Inventive effect] According to the first invention, when the entire chain box is viewed from the side, the chain appears The appearance that the rear part of the box is lifted upwards and backwards makes it possible to obtain an appearance with lightness.
藉由第2發明，可更提昇輕快感，且當上部箱體對搖 臂進行安裝時，可將下部箱體的後端部利用爲導引部，而 能夠提高組裝性。 藉由第3發明，而可得到更具輕快感的外觀。 【圖式簡單說明】 第1圖是機車的側面圖。 第2圖是鏈條箱的放大側面圖。 第3圖是第2圖的3 - 3線放大剖面圖。 第4圖是第2圖的4 一 4線放大剖面圖。According to the second invention, the lightness can be further enhanced, and when the swing arm is mounted on the upper case, the rear end portion of the lower case can be used as a guide, which can improve the assemblability. According to the third invention, a lighter appearance can be obtained. [Brief description of the drawings] Fig. 1 is a side view of a locomotive. Fig. 2 is an enlarged side view of the chain case. Figure 3 is an enlarged sectional view taken along the line 3-3 of Figure 2. Fig. 4 is an enlarged cross-sectional view taken along the line 4-4 in Fig. 2;
〔圖號說明〕 14a :搖臂 15 :車軸 54 :上部箱體 55 :下部箱體 7 〇 :後端連結部 C :搖臂中心線 WR :後輪 -15-[Illustration of drawing number] 14a: Rocker arm 15: Axle 54: Upper case 55: Lower case 7 〇: Rear end connection part C: Rocker centerline WR: Rear wheel -15-