1378055 六、發明說明： 【發明所屬之技術領域】 本發明是有關於-種機車車架結構，特別是有關於 種可確保結構強度之機車車架結構。 【先前技術】 請參閱第1圖、第2圖及第3圖，—種習知之機 架結構—1主要包括有-龍頭管1G、—縱管2()及兩側管扣。 縱管20是連接於龍頭管1〇。 兩侧管30是連接於縱管2〇，並且兩側管％是 彼此。此外，每-側管3G具有—半直筒形連接部Μ，以 及半直筒形連接部31是焊接於縱管％。更詳細的來說， 如第2圖及第3圖所示’由於兩個半直筒形連接部3 的距離很相近，故其與縱管2G焊狀㈣^間的； 會很相近。 士 =上戶^述，由於兩焊道S間的距離過於相近，故焊 日的咼熱里或尚溫會過於集中在縱管上之乃部立 ，因此’縱管20上之局部位置處會易於發生組織脆t 象，因而使得縱管20之結構強度變差。 【發明内容】 本發明基本上採用如下所詳述之特徵以為了要解央上 述之問題：$就是說’本發明包括一龍頭管；一縱管’，、 接於該龍頭官；以及兩側管，連接於該縱管，並且相 彼此’其中’每—側管具有—斜形連接部，該斜形連接部 1378055 係焊接於該縱管，以及兩個斜形連接部間的距離是以漸擴· 或漸縮之方式變化。 為使本發明之上述目的、特徵和優點能更明顯易懂， 下文特舉較佳實施例並配合所附圖式做詳細說明。 【實施方式】 茲配合圖式說明本發明之較佳實施例。 請參閱第4圖、第5圖及第6圖，本實施例之機車車 架結構100主要包括有一龍頭管110、一縱管120及兩側 管 130。 縱管120是連接於龍頭管110。 兩側管130是連接於縱管120,並且兩側管130是相對 於彼此。此外，每一侧管130具有一斜形連接部131，以 及斜形連接部131是焊接於縱管120。更詳細的來說，如 第5圖及第6圖所示，由於兩個斜形連接部131是配置形 成一正V形（如第5圖所示）或一倒V形（如第6圖所示）， 故兩個斜形連接部131間的距離是以漸擴或漸縮之方式變 化。因此，兩個斜形連接部131與縱管120焊接之兩焊道 S間的距離亦會形成漸擴或漸縮變化。 如上所述，由於兩焊道S間的距離是以漸擴或漸縮之 方式變化，故焊接時的高熱量或高溫不會過於集中在縱管 120上之局部位置處（亦即，焊接時的高熱量或高溫會較為 分散）。因此，縱管120會不易於發生組織脆化現象，因而 可確保縱管120之結構強度。 雖然本發明已以較佳實施例揭露於上，然其並非用以 1378055 限定本發明，任何熟習此項技藝者，在不脫離本發明之精 神和範圍内，當可作些許之更動與潤飾，因此本發明之保 護範圍當視後附之申請專利範圍所界定者為準。 1378055 【圖式簡單說明】 第1圖係顯示一習知之機車車架結構之立體示意圖； 第2圖係顯示根據第1圖之前視示意圖； 第3圖係顯示根據第1圖之後視示意圖； 第4圖係顯示本發明之機車車架結構之立體示意圖； 第5圖係顯示根據第4圖之前視示意圖；以及 第6圖係顯示根據第4圖之後視示意圖。 【主要元件符號說明】 1、100〜機車車架結構 10、110〜龍頭管 20、120〜縱管 30、130〜側管 31〜半直筒形連接部 131〜斜形連接部 S〜焊道1378055 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a locomotive frame structure, and more particularly to a locomotive frame structure capable of ensuring structural strength. [Prior Art] Please refer to Fig. 1, Fig. 2, and Fig. 3, a conventional frame structure-1 mainly includes a faucet tube 1G, a longitudinal tube 2 (), and two side tube buckles. The longitudinal tube 20 is connected to the tap tube 1〇. The side tubes 30 are connected to the longitudinal tubes 2, and the side tubes % are each other. Further, each of the side tubes 3G has a semi-straight cylindrical connecting portion Μ, and the semi-straight cylindrical connecting portion 31 is welded to the vertical tube %. More specifically, as shown in Fig. 2 and Fig. 3, since the distance between the two semi-straight cylindrical connecting portions 3 is very close, it is very similar to the longitudinal tube 2G welded (four).士=上户^, because the distance between the two weld beads S is too close, so the heat or temperature of the welding day will be too concentrated on the vertical pipe, so the local position on the longitudinal pipe 20 The tissue brittleness is liable to occur, thus making the structural strength of the longitudinal tube 20 worse. SUMMARY OF THE INVENTION The present invention basically employs the features detailed below in order to solve the above problems: $ means 'the invention includes a faucet tube; a vertical tube', connected to the faucet; and both sides a tube connected to the longitudinal tube and having a diagonal connecting portion for each of the side tubes, the oblique connecting portion 1378055 being welded to the longitudinal tube, and the distance between the two oblique connecting portions is Change gradually or gradually. The above described objects, features and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] A preferred embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 4, FIG. 5 and FIG. 6, the locomotive frame structure 100 of the present embodiment mainly includes a faucet tube 110, a vertical tube 120 and two side tubes 130. The longitudinal tube 120 is connected to the faucet tube 110. The two side tubes 130 are connected to the longitudinal tubes 120, and the side tubes 130 are opposite to each other. Further, each of the side tubes 130 has a slanted connecting portion 131, and the slanted connecting portion 131 is welded to the vertical tube 120. More specifically, as shown in FIGS. 5 and 6, the two oblique connecting portions 131 are arranged to form a positive V shape (as shown in FIG. 5) or an inverted V shape (as shown in FIG. 6). As shown, the distance between the two oblique connecting portions 131 is changed in a diverging or tapered manner. Therefore, the distance between the two bead joints S of the two oblique connecting portions 131 and the longitudinal pipe 120 is also gradually diverging or tapered. As described above, since the distance between the two weld beads S varies in a diverging or tapered manner, the high heat or high temperature during welding is not excessively concentrated at a local position on the longitudinal pipe 120 (i.e., at the time of welding). High heat or high temperature will be more dispersed). Therefore, the longitudinal tube 120 is less prone to tissue embrittlement, thereby ensuring the structural strength of the longitudinal tube 120. Although the present invention has been disclosed in its preferred embodiments, it is not intended to limit the invention, and it is possible to make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. 1378055 [Simplified illustration of the drawings] Fig. 1 is a schematic perspective view showing a conventional locomotive frame structure; Fig. 2 is a front view showing the structure according to Fig. 1; Fig. 3 is a rear view showing the first drawing according to Fig. 1; 4 is a perspective view showing the structure of the locomotive frame of the present invention; FIG. 5 is a front view showing the structure according to FIG. 4; and FIG. 6 is a rear view showing the structure according to FIG. [Description of main component symbols] 1. 100~ locomotive frame structure 10, 110~ faucet pipe 20, 120~ vertical pipe 30, 130 to side pipe 31~ semi-straight cylindrical connection portion 131~ oblique connection portion S~weld