1237675 (1) 玖、發明說明 【發明所屬之技術領域】 本發明是關於機車的空氣濾淸裝置。 【先前技術】 作爲機車的空氣濾淸裝置，習知的構造是在空氣濾淸 器盒體內設置有副室部的構造（例如參照專利文獻1 )。 【專利文獻1】 日本特開2001— 90623公報（第3頁，第4圖） 以下用第7圖來說明專利文獻1的第4圖。而圖號則 重新標過。 第7圖是傳統的空氣濾淸裝置的剖面圖（習知例1 ) ，是顯示了空氣濾淸裝置108，是以分隔壁102來分隔空 氣濾淸器盒體1 〇 1內，藉由以室部蓋1 03來封住開口部， 形成了構成吹漏氣還原裝置的副室部1 04，將連結管1 06 連結於該副室部的其中一邊的側壁部，在副室部另一邊的 側壁部則連結著濾心1 07的其中一端。 在第8圖顯示傳統的其他空氣濾淸裝置。 第8圖是傳統的空氣濾淸裝置的剖面圖（習知例2 ) ’是顯示了空氣濾淸裝置1 1 7，在空氣濾淸器盒體1 1 1的 外壁部安裝通氣裝置盒體112,將該通氣裝置盒體112經 由通氣管1 1 3連接到設置於空氣濾淸器盒體1丨丨內的空氣 濾心1 1 4，將該空氣濾心1 1 4的其中一端連接到在空氣濾 淸器盒體1 1 1所安裝的連接管1 1 6的端部。1 1 8是用來將 -4- 1237675 (2) 通氣裝置盒體1 1 2保持在空氣濾淸器盒體Π 1的索環’ 121、121是夾子。 【發明內容】 (發明欲解決的課題） 在空氣濾淸裝置，當要設定：進氣特性或進氣聲音特 性、引擎的輸出特性時，空氣濾淸器盒體的容量及形狀、 連接管的長度、直徑、安裝位置等是很重要的因素。 在第7圖中，例如，如果要變更連接管1 〇6的長度的 話，由於是將副室部1 04設置在空氣濾淸器盒體1 〇 1內及 連接管1 06之間的構造，所以不能使連接管1 〇6延伸到空 氣濾淸器盒體1 〇 1內，上述的進氣特性、進氣聲音特性、 輸出特性等的自由度會變少。 副室部1 04，雖然構成了空氣濾淸裝置，並且也具有 減低空氣濾淸器的進氣聲音的輔助消音機能，而如果要將 容量設定成，具有還原吹漏氣或減低進氣聲音的機能的3舌 ，會犧牲其進氣特性。 並且，在第8圖，是將相當於上述的副室部的通氣裝 置盒體1 1 2經由索環1 1 8安裝在空氣濾淸器盒體1 11，以 夾子121將通氣管113的其中一端固定在通氣裝置盒體 112，以夾子121將通氣裝置盒體113的另一端固定在空 氣濾心1 1 4的構造，安裝構造很複雜，且零件數量很多， 會讓成本上升。 因此，本發明的目的，是藉由改良機車的空氣濾淸裝 1237675 (3) 置，增加進氣特性、進氣聲音特性' 引擎的輸出特性等的 設定的自由度，特別是讓副室部不會影響到進氣特性’簡 化安裝構造，來讓成本降低。 (用以解決課題的手段） 用來達成上述目的的第1發明’在由：空氣濾淸器、 及設置在該空氣濾淸器的下游側，並且連接於燃料供給裝 置的連接管所構成的進氣裝置’設置有用來使引擎的吹漏 氣回流的副室部的機車，其特徵爲：使連接管朝向空氣濾 淸器盒體的內側延伸，以該連接管直接支承空氣濾淸器濾 心，在空氣濾淸器盒體的內壁’是一體地突出有在前端部 具有開口的盒體，在該盒體的開口設置蓋子而形成了副室 部，在蓋子，設置有聯接部，該聯接部是朝向連接管突出 ，且具備有從副室部內通到連接管內的連通路，是將該聯 接部直接連結到連接管的延伸部。 藉由使連接管朝向空氣濾淸器盒體的內側延伸’藉由 將副室部直接連結到連接管的延伸部’則與傳統的空氣濾 淸裝置相比，能夠變更連接管的長度，而可以增加進氣特 性、進氣聲音特性、引擎的輸出特性等的設定的自由度。 而以連接管直接支承空氣濾淸器濾心，且藉由將副室 部直接安裝到連接管，則與將副室部設置在支承空氣濾淸 器濾心的分隔壁的下游處的方式相比，不需要分隔壁，並 且也不會讓副室部影響到進氣特性。 並且，由於是將副室部直接安裝在連接管，簡化其安 -6- 1237675 (4) 裝構造，與傳統的空氣濾淸裝置相比，可以減少零件數量 ，且可以減低成本。 【實施方式】 以下根據附圖來說明本發明的實施方式。而圖面是從 圖號的方向來看。 第1圖是本發明的具備有空氣濾淸裝置的機車的側面 圖，機車10，是在車體框架11的下部安裝引擎12以及 一體地設於該引擎12的變速機13，在引擎12的上部後 部經由進氣管1 4安裝作爲燃料供給裝置的化油器1 6，在 該化油器1 6經由連接管1 7安裝空氣濾淸器1 8。 上述的連接管1 7及空氣濾淸器1 8，是具有本發明的 技術特徵的零件，構成了作爲空氣濾淸裝置的進氣裝置 20 〇 21、22、23是構成車體框架11的主管、下管、及座 墊管，24是一體地設置於空氣濾淸器1 8的下部的工具箱 ’ 26是構成車體框架11的前端部的頭管，27是可操舵地 安裝於頭管26的前叉，28是安裝於前叉27的下端部的 前輪，31是安裝於前叉27的上部的車把，32a〜32c是將 空氣濾淸器1 8及工具箱24安裝於車體框架1 1的安裝部 〇 33是覆蓋前輪28的上方的前擋泥板，34是頭燈，35 是儀表，3 7是安裝於車體框架1 1的上部的油箱，3 8是安 裝於座墊管23的座墊，4 1是安裝於主管2 1的下部側的 1237675 (5) 搖臂，42是安裝於搖臂41的後端的後輪，43是覆蓋後輪 的上方的後擋泥板，44、44 (僅顯示前側的圖號44 )是 涵蓋於搖臂41的後端與座墊管23的後避震單元，46是 主腳架。 第2圖是本發明的空氣濾淸器的剖面圖，空氣渡、、淸器 1 8，是由：空氣濾淸器盒體5 1、收容於該空氣濾淸器盒 體5 1內的空氣濾淸器濾心5 2、用來將空氣吸入到空氣爐、 淸器盒體5 1內，而安裝於空氣濾淸器盒體5 1的後部的橡 膠製的進氣管5 3、以及形成在空氣濾淸器盒體5 1內的gfJ 室部54所構成。55是連接引擎12 (參照第1 _)與副室 部54的吹漏氣軟管。 空氣濾淸器盒體5 1，是在前部壁5 6開設有前部安裝 孔5 7，且在後部壁5 8開設有後部安裝孔6 1的零件，是 在前部安裝孔57嵌有橡膠製的連接管17,在後部安裝孔 61嵌有進氣管53。63是用來將空氣濾淸器盒體51內的 水分排出到外部的一體設於空氣濾淸器盒體5 1的下部壁 64的排水管。 空氣濾淸器濾心52，具備有連結管66，是使連接管 1 7的前端嵌合於該連結管66。 副室部54，是藉由安裝於連接管1 7的側面而與連接 管1 7內連通的零件，是用來將從引擎1 2的曲軸箱內經由 吹漏氣軟管5 5所導入的吹漏氣中所含有的水分及油分予 以去除的構造，經過去除處理的吹漏氣’會通過連接管 1 7、第1圖所示的化油器1 6、進氣管1 4，到達引擎1 2的 -8- 1237675 (6) 燃燒室而燃燒。 回到第2圖，上述的副室部5 4、吹漏氣軟管5 5、及 連接管17，是構成吹漏氣還原裝置68的零件。 也就是說，吹漏氣還原裝置68，會經由吹漏氣軟管 5 5、副室部54、設置有連接於副室部54的連接部的連接 管1 7，使從引擎1 2的燃燒室漏出到曲軸箱內的吹漏氣（ 包含未燃燒氣體）再次循環（也就是還原）到進氣系統的 裝置。 第3圖，是第2圖的3 — 3線剖面圖（局部正面圖） ，空氣濾淸器盒體5 1是由：盒體主體7 1、與封閉該盒體 主體71的開口的盒體外殼72所構成，在盒體主體71的 底壁部73 —體地形成了作爲箱形的盒體部的室部主體74 ，在該室部主體74的前端部固定安裝著作爲蓋子的室部 蓋76，也就是藉由以室部蓋76封閉室部主體74的開口 77來形成副室部54，在室部蓋76是一體地形成有開設有 連通路78的作爲聯接部的突出部8 1，使開設於連接管1 7 的側面的連結孔8 2嵌合於設置於該突出部8 1的環狀溝槽 81a，而使副室部54內與連接管17內連通在一起。而83 • · ( · •代表有複數個。以下相同。）是將盒體外殼 72安裝於盒體主體7 1的小螺釘。 如以上所述，藉由使副室部5 4，詳細來說是使室部 主體74 —體成型於空氣濾淸器盒體5 1，則可以減少空氣 濾淸器1 8的零件數量，可以讓成本降低。 第4圖是第2圖的4 - 4線剖面圖，是以連接管1 7來 -9- 1237675 (7) 支承空氣濾淸器濾心5 2的前部，是以從空氣濾淸器盒體 5 1的內面一體地突出的濾心支承部8 5 ··、8 6 ··來支 承空氣濾淸器濾心52的後部。 濾心支承部8 5 ··是設置於盒體主體7 1，濾心支承 部·· 86，是設置於盒體外殼72。 連接管1 7，是大幅度地延伸到空氣濾淸器盒體5 1內 的構造，將該延伸部分作爲延伸部1 7a的話，藉由設置該 延伸部1 7a，例如，當要改變進氣特性、進氣聲音特性、 引擎的輸出特性時，藉由變更延伸部1 7a的長度L則可以 增加其自由度。 當將延伸部1 7a的長度L加大時，由於是以副室部 54的突出部81來支承延伸部17a的構造，所以可以防止 延伸部17a的振動，而能夠以連接管17確實地支承空氣 濾淸器濾心5 2。 第5圖是第3圖的5 — 5線剖面圖，副室部5 4，是藉 由使突出壁部92從側壁部9 1朝側邊斜下方突出，且使突 出壁部9 4從側壁部9 3朝側邊斜下方突出而作成迷路構造 ，且在下部具備有一體形成的吹漏氣導入管96，使該吹 漏氣導入管9 6突出於空氣濾淸器盒體5 1的外部，將吹漏 氣軟管（參照第2圖）連接於該導入管96。97是用來使 空氣濾淸器盒體5 1的外部與副室部54內連通的通孔。 接下來說明以上所述的副室部54的作用。 桌6圖是顯示本發明的副室部的作用的作用圖。 如箭頭所示，當吹漏氣，從引擎的曲軸箱經由吹漏氣 -10- 1237675 (8) 軟管55流入到副室部54內時，藉由以突出壁部92、94 所構成的迷路構造來除去吹漏氣中的水分及油分，吹漏氣 ，會從副室部54內通過連通路78流到連接管1 7內，經 由化油器及進氣管而到達引擎的燃燒室。藉由迷路構造所 去除的水分及油分，會經由吹漏氣軟管5 5而回到引擎的 曲軸箱內。 如上述的第1圖及第4圖所說明，本發明，在由：空 氣濾淸器1 8、及設置在該空氣濾淸器1 8的下游側，並且 連接於化油器1 6的連接管1 7所構成的進氣裝置20，設 置有用來使引擎12的吹漏氣回流的副室部54的機車10 ，其特徵爲：使連接管1 7朝向空氣濾淸器盒體5 1的內側 延伸，以該連接管1 7直接支承空氣濾淸器濾心5 2，在空 氣濾淸器盒體51的內壁，是一體地突出有在前端部具有 開口 77的室部主體74，在該室部主體74的開口 77設置 室部蓋76而形成了副室部54，在室部蓋76，設置有突出 部81，該突出部81是朝向連接管17突出，且具備有從 副室部54內通到連接管1 7內的連通路78，是將該突出 部8 1直接連結到連接管1 7的延伸部1 7a。 藉由使連接管1 7延伸到空氣濾淸器盒體5 1的內側’ 且將副室部54直接連結到連接管1 7的延伸部1 7a ’則與 傳統的空氣濾淸器裝置相比，可以變更連接管1 7的長g ，而能夠增加進氣特性、進氣聲音特性、引擎1 2的輸出 特性等的設定自由度。 藉由以連接管1 7來直接支承空氣濾淸器濾心5 2 ’ 1 -11 - 1237675 (9) 直接將副室部5 4安裝在連接管1 7，則與傳統的將副室部 設置在支承空氣濾淸器濾心的分隔壁的下游處的方式相比 ，在本發明，不需要分隔壁，且也不會影響到副室部5 4 的進氣特性。 並且，由於是直接將副室部5 4安裝在連接管1 7，簡 化其安裝構造，而與傳統的空氣濾淸裝置相比，本發明的 空氣濾淸裝置可以減少零件數量，而可以減低成本。 在本發明，雖然是將副室部一體地形成於空氣濾淸器 盒體的內壁，而並不限於此，也可一體地形成於空氣濾淸 器的外壁部，將副室部的突出部連結於連接管。 (發明效果） 第一發明的機車的空氣濾淸裝置，使連接管朝向空氣 濾淸器盒體的內側延伸，以該連接管直接支承空氣濾淸器 濾心，在空氣濾淸器盒體的內壁，是一體地突出有在前端 部具有開口的盒體，在該盒體的開口設置蓋子而形成了副 室部，在蓋子，設置有聯接部，該聯接部是朝向連接管突 出，且具備有從副室部內通到連接管內的連通路，是將該 聯接部直接連結到連接管的延伸部，所以與傳統的吹漏氣 還原裝置相比，能夠變更連接管的長度，而可以增加進氣 特性、進氣聲音特性、引擎的輸出特性等的設定的自由度 〇 以連接管直接支承空氣濾淸器濾心’且藉由將副室部 直接安裝到連接管，則與將副室部設置在支承空氣濾淸器 -12- 1237675 (10) 濾心的分隔壁的下游處的方式相比’不需要分隔壁，並且 也不會讓副室部影響到進氣特性。 並且，由於是將副室部直接安裝在連接管，簡化其安 裝構造，與傳統的空氣濾淸裝置相比，可以減少零件數量 ，且可以減低成本。 【圖式簡單說明】 第1圖是本發明的具備有空氣濾淸裝置的機車的側面 | 圖。 第2圖是本發明的空氣濾淸器的剖面圖。 第3圖是第2圖的3 — 3線剖面圖。 第4圖是第2圖的4一 4線剖面圖。 第5圖是第3圖的5 - 5線剖面圖。 第6圖是顯示本發明的副室部的作用的作用圖。 第7圖是傳統的空氣濾淸裝置的剖面圖（習知例1 ) 〇 第8圖是傳統的空氣濾淸裝置的剖面圖（習知例2 ) 【主要元件對照表】 1 0 :機車 12 :引擎 1 6 :燃料供給裝置（化油器） 1 7 :連接管 -13- 1237675 (11) 17a :連接管的延伸部 1 8 :空氣濾淸器 20 :空氣濾淸裝置（進氣裝置） 5 1 :空氣濾淸器盒體 5 2 :空氣濾淸器濾心 5 4 :副室部 68 :吹漏氣還原裝置 74 :盒體部（室部主體） 76 :蓋子（室部蓋） 77 :盒體部的開口 78 :連通路 81 :聯接部（突出部）1237675 (1) Description of the invention [Technical field to which the invention belongs] The present invention relates to an air filter device for a locomotive. [Prior Art] As a conventional air filter device for a locomotive, a conventional structure is a structure in which a subchamber portion is provided in an air filter case (for example, refer to Patent Document 1). [Patent Document 1] Japanese Patent Laid-Open Publication No. 2001-90623 (page 3, FIG. 4) The fourth diagram of Patent Document 1 will be described with reference to the seventh diagram. The drawing numbers are re-marked. FIG. 7 is a cross-sectional view of a conventional air filter device (conventional example 1), which shows the air filter device 108, and the partition wall 102 is used to separate the air filter box body 101, and The chamber cover 103 covers the opening portion, and forms a sub chamber portion 104 which constitutes a blow-by gas reduction device. The connecting pipe 10 is connected to one side wall portion of the sub chamber portion, and the other side of the sub chamber portion. The side wall portion is connected to one end of the filter core 107. Fig. 8 shows another conventional air filter device. Fig. 8 is a cross-sectional view of a conventional air filter device (conventional example 2). "The air filter device 1 1 7 is shown, and a ventilation device box body 112 is mounted on the outer wall portion of the air filter box body 1 1 1". Connect the ventilation device box 112 to the air filter 1 1 4 provided in the air filter box 1 1 through the ventilation tube 1 1 3, and connect one end of the air filter 1 1 4 to the air filter 1 1 4 The end of the connecting pipe 1 1 6 to which the air filter case 1 1 1 is mounted. 1 1 8 is a grommet '121, 121 for holding the -4- 1237675 (2) ventilation device case 1 1 2 to the air filter case Π 1, 121 is a clip. [Summary of the Invention] (Problems to be Solved by the Invention) In an air filter device, when it is required to set: air intake characteristics or air intake sound characteristics, engine output characteristics, the capacity and shape of the air filter case, Length, diameter, and mounting position are important factors. In FIG. 7, for example, if the length of the connecting pipe 10 is to be changed, since the auxiliary chamber portion 104 is provided in the air filter box body 100 and the structure between the connecting pipe 106, Therefore, the connecting pipe 1 06 cannot be extended into the air filter case 1 01, and the above-mentioned degrees of freedom of the air intake characteristics, air intake sound characteristics, output characteristics and the like are reduced. Although the auxiliary chamber section 104 constitutes an air filter device, it also has an auxiliary muffler function to reduce the intake air sound of the air filter. If the capacity is to be set, it has a function of reducing air leakage or reducing the intake air sound. The functioning 3 tongues will sacrifice its air intake characteristics. In addition, in FIG. 8, the ventilation device case 1 1 2 corresponding to the above-mentioned sub-chamber portion is attached to the air filter case 1 11 via the grommet 1 1 8, and one of the ventilation pipes 113 is clipped 121. One end is fixed to the ventilation device box body 112, and the other end of the ventilation device box body 113 is fixed to the air filter 1 1 4 with a clip 121. The installation structure is very complicated, and the number of parts is large, which will increase the cost. Therefore, an object of the present invention is to improve the degree of freedom in setting the intake characteristics, the intake sound characteristics, the engine's output characteristics, and the like by improving the air filter installation 1237675 (3) of the locomotive, and in particular to allow the subchamber portion Does not affect the air intake characteristics. 'Simplified installation structure to reduce costs. (Means for Solving the Problem) A first invention for achieving the above-mentioned object is an air filter and a connection pipe provided downstream of the air filter and connected to a fuel supply device. The air intake device is a locomotive provided with a sub-chamber for returning blown air from the engine. The locomotive is characterized in that the connecting pipe extends toward the inner side of the air filter case, and the connecting pipe directly supports the air filter. The inner wall of the air filter box body is integrally projected with a box body having an opening at a front end portion. A cover is provided at the opening of the box body to form a sub-chamber portion. A connection portion is provided at the cover. This coupling portion protrudes toward the connection pipe, and includes a communication path leading from the inside of the subchamber portion into the connection pipe, and is an extension portion that directly connects the coupling portion to the connection pipe. By extending the connecting pipe toward the inside of the air filter case, 'by connecting the subchamber portion directly to the extension of the connecting pipe', the length of the connecting pipe can be changed compared with a conventional air filter device, and It is possible to increase the degree of freedom in setting the intake characteristics, intake sound characteristics, and engine output characteristics. The direct support of the air filter element by the connection pipe and the direct installation of the sub chamber portion to the connection pipe are similar to the manner in which the sub chamber portion is provided downstream of the partition wall supporting the air filter element. In addition, no partition wall is required, and the sub-chamber portion does not affect the air intake characteristics. In addition, since the auxiliary chamber is directly installed on the connecting pipe, the installation structure is simplified -6- 1237675 (4). Compared with the traditional air filter device, the number of parts can be reduced, and the cost can be reduced. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. The drawing is viewed from the direction of the drawing number. FIG. 1 is a side view of a locomotive provided with an air filter device according to the present invention. In the locomotive 10, an engine 12 and a transmission 13 integrally provided on the engine 12 are mounted below the vehicle body frame 11. A carburetor 16 as a fuel supply device is attached to the upper rear portion via an intake pipe 14, and an air filter 18 is attached to the carburetor 16 via a connection pipe 17. The above-mentioned connecting pipe 17 and air filter 18 are components having the technical features of the present invention, and constitute an air intake device 20 as an air filter device. 021, 22, and 23 are main directors constituting the body frame 11. , Lower tube, and seat cushion tube, 24 is a tool box integrally provided at the lower part of the air filter 18, 26 is a head tube constituting the front end portion of the vehicle body frame 11, and 27 is a steerably mounted head tube The front fork of 26, 28 is a front wheel attached to the lower end of the front fork 27, 31 is a handlebar attached to the upper part of the front fork 27, and 32a to 32c are attached to the air filter 18 and the tool box 24 to the vehicle body. The mounting part 03 of the frame 11 is a front fender covering the upper part of the front wheel 28, 34 is a headlight, 35 is an instrument, 37 is a fuel tank mounted on the upper part of the vehicle body frame 11, and 38 is a seat. For the seat cushion of the cushion tube 23, 41 is a 1237675 (5) rocker mounted on the lower side of the main pipe 21, 42 is a rear wheel mounted on the rear end of the rocker 41, and 43 is a rear fender covering the upper part of the rear wheel. Plates 44 and 44 (only the front side number 44 is shown) are rear shock absorbing units that are included in the rear end of the swing arm 41 and the seat cushion tube 23, and 46 is the main tripod. Fig. 2 is a cross-sectional view of the air filter of the present invention. The air filter 18 is composed of the air filter case 51 and the air contained in the air filter case 51. Filter element 5 2. A rubber intake pipe 5 3 which is used to suck air into the air furnace and the casing 5 1, and is installed at the rear of the air filter case 5 1. The gfJ chamber portion 54 in the air filter case 51 is formed. 55 is a blow-by hose which connects the engine 12 (refer to 1st) to the auxiliary chamber portion 54. The air filter case 51 is a part provided with a front mounting hole 57 in the front wall 56 and a rear mounting hole 61 in the rear wall 58. It is embedded in the front mounting hole 57 The connecting pipe 17 made of rubber is fitted with an air inlet pipe 53 in the rear mounting hole 61. 63 is a unit provided in the air filter case 51 to discharge the moisture in the air filter case 51 to the outside. Drain pipe of the lower wall 64. The air filter element 52 is provided with a connection pipe 66, and the front end of the connection pipe 17 is fitted into the connection pipe 66. The sub-chamber portion 54 is a component that communicates with the inside of the connecting pipe 17 by being mounted on the side of the connecting pipe 17 and is used to be introduced from the crankcase of the engine 12 through the blow-by air hose 55. The structure that removes the moisture and oil contained in the blow-by air. The blow-by air that has been removed will pass through the connecting pipe 17, the carburetor 16 and the intake pipe 1 4 shown in Figure 1, and reach the engine. 1 2-8-8 1237675 (6) Combustion chamber. Returning to Fig. 2, the above-mentioned auxiliary chamber portion 54, the blow-by air hose 55, and the connection pipe 17 are components constituting the blow-by gas reduction device 68. In other words, the blow-by gas reduction device 68 causes the combustion from the engine 12 through the blow-by air hose 55, the auxiliary chamber portion 54, and the connecting pipe 17 provided with the connecting portion connected to the auxiliary chamber portion 54. The blow-by gas (including unburned gas) leaked from the chamber into the crankcase is recirculated (ie reduced) to the device of the air intake system. Fig. 3 is a sectional view taken along line 3-3 (partial front view) of Fig. 2. The air filter case 51 is composed of a case body 71 and a case body which closes the opening of the case body 71. The housing 72 is constituted, and a chamber body 74 as a box-shaped box body is integrally formed on the bottom wall portion 73 of the box body 71. A chamber portion whose cover is a cover is fixedly mounted on a front end portion of the chamber body 74. The cover 76, that is, the sub-chamber portion 54 is formed by closing the opening 77 of the chamber main body 74 with the chamber cover 76. The chamber cover 76 is integrally formed with a protruding portion 8 as a coupling portion provided with a communication path 78. 1. A connection hole 8 2 provided in a side surface of the connection pipe 17 is fitted into an annular groove 81 a provided in the protruding portion 81 to communicate the inside of the subchamber portion 54 with the inside of the connection pipe 17. And 83 • ((• • represents a plurality. The same applies hereinafter.) Are small screws that attach the case body 72 to the case body 71. As described above, by forming the sub-chamber portion 54 and, in particular, the body 74 of the chamber portion into the air filter case 51, the number of parts of the air filter 18 can be reduced. Keep costs down. Fig. 4 is a cross-sectional view taken along line 4-4 of Fig. 2. The connection part 17 to 9-1237575 (7) supports the front of the air filter element 5 2 from the air filter case. The filter element supporting portions 8 5 ··, 8 6 ·· which project integrally from the inner surface of the body 51 support the rear portion of the air filter element 52. The filter support portion 8 5 is provided in the case main body 71, and the filter support portion 86 is provided in the case case 72. The connecting pipe 17 has a structure that extends substantially into the air filter case 51. When the extension portion is used as the extension portion 17a, the extension portion 17a is provided. For example, when the intake air is to be changed For characteristics, intake sound characteristics, and engine output characteristics, the degree of freedom can be increased by changing the length L of the extension portion 17a. When the length L of the extension portion 17a is increased, since the extension portion 17a is supported by the protruding portion 81 of the sub-chamber portion 54, the vibration of the extension portion 17a can be prevented, and the connection tube 17 can be reliably supported Air filter element 5 2. Fig. 5 is a cross-sectional view taken along line 5-5 in Fig. 3. The sub-chamber portion 54 is made to project obliquely downward from the side wall portion 91 from the side wall portion 91, and the side wall portion 94 is projected from the side wall. The part 9 3 protrudes obliquely downward to form a stray structure, and is provided with an integrally formed blow-by gas introduction pipe 96 at the lower portion, so that the blow-by air introduction pipe 9 6 protrudes from the outside of the air filter case 51 An air leak hose (see FIG. 2) is connected to the introduction pipe 96. 97 is a through hole for communicating the outside of the air filter case 51 with the inside of the sub chamber portion 54. Next, the function of the sub chamber portion 54 described above will be described. Table 6 is a functional diagram showing the function of the subchamber portion of the present invention. As shown by the arrow, when the blow-by air flows from the engine's crankcase through the blow-by air-10- 1237675 (8) into the auxiliary chamber portion 54 through the hose 55, it is formed by protruding wall portions 92 and 94. The labyrinth structure removes moisture and oil from the blow-by gas. The blow-by gas will flow from the subchamber portion 54 through the communication path 78 into the connection pipe 17 and pass through the carburetor and the intake pipe to reach the combustion chamber of the engine. . Moisture and oil removed by the labyrinth structure are returned to the engine's crankcase through the blow-by hose 55. As explained in the above-mentioned FIGS. 1 and 4, in the present invention, the air filter 18 is connected to the carburetor 16 and is provided downstream of the air filter 18 and connected to the carburetor 16. The air intake device 20 constituted by the tubes 17 is provided with a locomotive 10 having a sub-chamber portion 54 for returning the blow-by gas of the engine 12. The locomotive 10 is characterized in that the connecting tube 17 is directed toward the air filter case 51. Extending inside, the air filter element 52 is directly supported by the connecting pipe 17, and a chamber main body 74 having an opening 77 at the front end is integrally projected on the inner wall of the air filter case 51. The opening 77 of the chamber main body 74 is provided with a chamber cover 76 to form a sub-chamber portion 54. The chamber cover 76 is provided with a protrusion 81 that protrudes toward the connecting pipe 17 and includes a sub-chamber. The communication path 78 in the portion 54 leading to the connection pipe 17 is to directly connect the protruding portion 81 to the extension portion 17 a of the connection pipe 17. By extending the connecting pipe 17 to the inside of the air filter case 51 and connecting the subchamber 54 directly to the extending portion 17a of the connecting pipe 17, it is compared with the conventional air filter device. It is possible to change the length g of the connecting pipe 17 to increase the degree of freedom in setting the intake characteristics, the intake sound characteristics, the output characteristics of the engine 12 and the like. The air filter element 5 2 '1 -11-1237675 is directly supported by the connecting pipe 17 (9) The auxiliary chamber section 5 4 is directly installed on the connecting pipe 17 and the conventional auxiliary chamber section is installed. Compared with the method of supporting the air filter element downstream of the partition wall, in the present invention, the partition wall is not required, and the air intake characteristics of the sub-chamber portion 54 are not affected. In addition, since the auxiliary chamber portion 54 is directly installed on the connecting pipe 17 to simplify the installation structure, the air filter device of the present invention can reduce the number of parts and reduce the cost compared with the conventional air filter device. . In the present invention, although the sub-chamber portion is integrally formed on the inner wall of the air filter case, it is not limited to this. The sub-chamber portion may also be integrally formed on the outer wall portion of the air filter to protrude the sub-chamber portion. The part is connected to the connecting pipe. (Effects of the Invention) The air filter device of the locomotive of the first invention extends the connection pipe toward the inside of the air filter box body, and directly supports the air filter core with the connection pipe. The inner wall is integrally projected with a box body having an opening at the front end portion, and a cover is formed at the opening of the box body to form a sub-chamber portion. The cover is provided with a coupling portion which protrudes toward the connecting pipe, and Equipped with a communication path from the subchamber to the connecting pipe. This connecting section is directly connected to the extension of the connecting pipe. Therefore, the length of the connecting pipe can be changed compared to a conventional blow-by gas reduction device. Increase the degree of freedom in setting the air intake characteristics, air intake sound characteristics, engine output characteristics, and so on. ○ Directly support the air filter element with the connection tube, and by directly attaching the subchamber to the connection tube, Compared with the method in which the chamber portion is provided downstream of the partition wall supporting the air filter-12-1237575 (10), the partition wall does not require a partition wall and does not affect the intake characteristics of the sub-chamber portion. In addition, since the auxiliary chamber is directly installed on the connecting pipe, the installation structure is simplified, and the number of parts can be reduced compared with the conventional air filter device, and the cost can be reduced. [Brief Description of the Drawings] Fig. 1 is a side view of a locomotive provided with an air filter device according to the present invention. Fig. 2 is a sectional view of an air filter according to the present invention. Fig. 3 is a sectional view taken along the line 3-3 in Fig. 2. Fig. 4 is a sectional view taken along the line 4-4 in Fig. 2; Fig. 5 is a sectional view taken along the line 5-5 in Fig. 3. Fig. 6 is an operation diagram showing the operation of the sub-chamber portion of the present invention. Fig. 7 is a cross-sectional view of a conventional air filter device (conventional example 1) 〇 Fig. 8 is a cross-sectional view of a conventional air filter device (conventional example 2) [comparison table of main components] 1 0: locomotive 12 : Engine 1 6: Fuel supply device (carburetor) 1 7: Connection pipe-13-1237575 (11) 17a: Extension of connection pipe 1 8: Air filter 20: Air filter device (intake device) 5 1: Air filter case 5 2: Air filter element 5 4: Subchamber part 68: Air leakage reduction device 74: Box body part (chamber part body) 76: Cover (chamber part cover) 77 : Box body opening 78: Communication path 81: Coupling part (projecting part)
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