JP2013019199A - Exhaust device for construction machine - Google Patents

Exhaust device for construction machine Download PDF

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JP2013019199A
JP2013019199A JP2011154332A JP2011154332A JP2013019199A JP 2013019199 A JP2013019199 A JP 2013019199A JP 2011154332 A JP2011154332 A JP 2011154332A JP 2011154332 A JP2011154332 A JP 2011154332A JP 2013019199 A JP2013019199 A JP 2013019199A
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opening end
tail pipe
pipe
end surface
downstream side
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JP6289796B2 (en
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Nobuyuki Ishii
信行 石井
Tetsuya Sugaya
徹也 菅谷
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Sumitomo SHI Construction Machinery Co Ltd
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Sumitomo SHI Construction Machinery Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an exhaust device for a construction machine for suppressing the entry of raindrops into a muffler.SOLUTION: An exhaust device 40 for the construction machine comprises: a discharge pipe 410 of a muffler part 41 connected to an engine 31; and a tail pipe 42 receiving an opening end face 410A on the downstream side of the discharge pipe 410 through the inside of an opening end face 42B on the upstream side of itself. All line segment between any one point in the opening end face 42A on the downstream side of the tail pipe 42 and any one point in the opening end face 410A of the downstream side of the discharge pipe 410 has points of intersection with the wall faces of the tail pipe 42.

Description

本発明は、建設機械用排気装置に関し、特に、エンジンに接続されたマフラーの吐出パイプと、その吐出パイプの下流側の開口端面を自身の上流側の開口端面の内側に受け入れるテールパイプとを含む建設機械用排気装置に関する。   The present invention relates to an exhaust device for a construction machine, and in particular, includes a muffler discharge pipe connected to an engine, and a tail pipe that receives an opening end face on the downstream side of the discharge pipe inside an opening end face on its upstream side. The present invention relates to an exhaust device for construction machinery.

従来、エンジンに接続されたマフラーの吐出パイプと、エンジンカバーに固定したテールパイプとで構成される排気装置を備えた建設機械が知られている（例えば、特許文献１参照。）。   2. Description of the Related Art Conventionally, a construction machine is known that includes an exhaust device that includes a muffler discharge pipe connected to an engine and a tail pipe fixed to an engine cover (see, for example, Patent Document 1).

この排気装置は、テールパイプのマフラー側（排気ガスの流れにおける上流側）を拡開形状とし、吐出パイプの下流側の端部をそのテールパイプの拡開形状の中に挿入するように配置することによって、エゼクタ効果を利用したエンジン室内の冷却性能を向上させるようにしている。   This exhaust device is arranged so that the muffler side (upstream side in the exhaust gas flow) of the tail pipe has an expanded shape, and the downstream end of the discharge pipe is inserted into the expanded shape of the tail pipe. Thus, the cooling performance in the engine compartment using the ejector effect is improved.

特開２０００−３４７４２号公報JP 2000-34742 A

しかしながら、特許文献１の排気装置は、エンジン停止時にテールパイプの下流側の開口から侵入した雨滴が吐出パイプの下流側の開口を通じてマフラー内部に直接侵入するのを許容する構成であり、マフラー内部の腐食を引き起こすおそれがある。   However, the exhaust device of Patent Document 1 is configured to allow raindrops that have entered from the opening on the downstream side of the tail pipe when the engine is stopped to directly enter the inside of the muffler through the opening on the downstream side of the discharge pipe. May cause corrosion.

上述の点に鑑み、本発明は、マフラー内部への雨滴の浸入を抑制する建設機械用排気装置を提供することを目的とする。   In view of the above points, an object of the present invention is to provide an exhaust device for a construction machine that suppresses the intrusion of raindrops into the muffler.

上述の目的を達成するために、本発明の実施例に係る建設機械用排気装置は、建設機械のエンジンに接続されたマフラーの吐出パイプと、該吐出パイプの下流側の開口端面を自身の上流側の開口端面の内側に受け入れるテールパイプとを含む建設機械用排気装置であって、前記テールパイプの下流側の開口端面内の任意の一点と、前記吐出パイプの下流側の開口端面内の任意の一点とを結ぶ線分の全てが、前記テールパイプの壁面との交点を有することを特徴とする。   In order to achieve the above-described object, an exhaust device for a construction machine according to an embodiment of the present invention includes a muffler discharge pipe connected to an engine of the construction machine, and an opening end face on the downstream side of the discharge pipe. An exhaust device for a construction machine including a tail pipe that is received inside an opening end surface on the side, and an arbitrary point in the opening end surface on the downstream side of the tail pipe, and an arbitrary point in the opening end surface on the downstream side of the discharge pipe All of the line segments connecting one point have intersections with the wall surface of the tail pipe.

上述の手段により、本発明は、マフラー内部への雨滴の浸入を抑制する建設機械用排気装置を提供することができる。   With the above-described means, the present invention can provide an exhaust device for a construction machine that suppresses intrusion of raindrops into the muffler.

本発明の実施例に係る排気装置を搭載するショベルの側面図である。It is a side view of the shovel which mounts the exhaust apparatus which concerns on the Example of this invention. 図１の矢印ＩＩで示す方向から見た上部旋回体の斜視図である。It is the perspective view of the upper revolving body seen from the direction shown by the arrow II of FIG. 図２の矢印ＩＩＩで示す方向から見た上部旋回体の背面透過図である。FIG. 3 is a rear transparent view of the upper swing body viewed from a direction indicated by an arrow III in FIG. 2. 図２の矢印ＩＶで示す方向から見た上部旋回体の側面透過図である。FIG. 4 is a side transparent view of the upper swing body viewed from a direction indicated by an arrow IV in FIG. 2. 図４の点線円Ｖの部分を拡大した、吐出パイプとテールパイプとの間の位置関係を示す図（その１）である。FIG. 5 is a diagram (part 1) illustrating a positional relationship between a discharge pipe and a tail pipe, in which a dotted circle V in FIG. 4 is enlarged. 吐出パイプとテールパイプとの間の位置関係を示す図（その２）である。It is a figure (the 2) which shows the positional relationship between a discharge pipe and a tail pipe. テールパイプの製造方法の説明図である。It is explanatory drawing of the manufacturing method of a tail pipe.

以下、図面を参照しながら、本発明の実施例について説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の実施例に係る建設機械用排気装置を搭載するショベルの側面図である。図１のショベルは、クローラ式の下部走行体１の上に、旋回機構２を介して、上部旋回体３を旋回自在に搭載する。   FIG. 1 is a side view of an excavator equipped with a construction machine exhaust device according to an embodiment of the present invention. The excavator of FIG. 1 mounts the upper turning body 3 on a crawler type lower traveling body 1 via a turning mechanism 2 so as to be turnable.

上部旋回体３は、前方中央部に、ブーム４、アーム５、及びバケット６と、それらのそれぞれを駆動するブームシリンダ７、アームシリンダ８、及びバケットシリンダ９とから構成される掘削アタッチメントを搭載する。また、上部旋回体３は、操作者が乗り込むためのキャビン１０を前部に搭載し、駆動源としてのエンジン３１（図３参照。）を後部に搭載する。なお、以下では、ブームシリンダ７、アームシリンダ８、バケットシリンダ９、走行用油圧モータ（図示せず。）、旋回用油圧モータ（図示せず。）等を集合的に「油圧アクチュエータ」と称するものとする。   The upper swing body 3 is equipped with a drilling attachment including a boom 4, an arm 5, and a bucket 6 and a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9 that drive each of them in the front center portion. . Further, the upper swing body 3 has a cabin 10 for an operator to get on, and an engine 31 (see FIG. 3) as a drive source mounted on the rear. In the following, the boom cylinder 7, the arm cylinder 8, the bucket cylinder 9, the traveling hydraulic motor (not shown), the turning hydraulic motor (not shown), etc. are collectively referred to as “hydraulic actuator”. And

図２は、図１の矢印ＩＩで示す方向から見た上部旋回体３の斜視図であり、図３は、図２の矢印ＩＩＩで示す方向から見た上部旋回体３の背面透過図であり、図４は、図２の矢印ＩＶで示す方向から見た上部旋回体３の側面透過図である。   2 is a perspective view of the upper swing body 3 viewed from the direction indicated by arrow II in FIG. 1, and FIG. 3 is a rear transparent view of the upper swing body 3 viewed from the direction indicated by arrow III in FIG. 4 is a side transparent view of the upper swing body 3 viewed from the direction indicated by the arrow IV in FIG.

上部旋回体３は、取り外し可能なエンジンカバー３０でその上面の一部が覆われ、エンジン３１、ラジエタ３２、油圧ポンプ３３、排気装置４０等をその内部に収容する。   A part of the upper surface of the upper swing body 3 is covered with a removable engine cover 30, and the engine 31, the radiator 32, the hydraulic pump 33, the exhaust device 40 and the like are accommodated therein.

エンジン３１は、ショベルに搭載される駆動源であり、例えば、所定の回転速度で回転するディーゼルエンジンであって、油圧ポンプ３３を回転駆動するための力を発生させる。   The engine 31 is a drive source mounted on the excavator, and is, for example, a diesel engine that rotates at a predetermined rotation speed, and generates a force for rotationally driving the hydraulic pump 33.

ラジエタ３２は、エンジン３１を冷却するための装置であり、例えば、冷却水を循環させてエンジン３１を冷却する。   The radiator 32 is a device for cooling the engine 31. For example, the radiator 32 cools the engine 31 by circulating cooling water.

油圧ポンプ３３は、油圧アクチュエータに圧油を供給するための装置であり、例えば、操作レバー（図示せず。）に対する操作量に応じた圧油をブームシリンダ７、アームシリンダ８、及びバケットシリンダ９に供給してブーム４、アーム５、及びバケット６を動作させる。   The hydraulic pump 33 is a device for supplying pressure oil to a hydraulic actuator. For example, the boom cylinder 7, the arm cylinder 8, and the bucket cylinder 9 apply pressure oil corresponding to an operation amount with respect to an operation lever (not shown). The boom 4, the arm 5 and the bucket 6 are operated.

排気装置４０は、エンジン３１の排気ガスを外部に排出するための装置であり、本実施例では、主に、マフラー部４１とテールパイプ４２とを含む。   The exhaust device 40 is a device for discharging the exhaust gas of the engine 31 to the outside. In the present embodiment, the exhaust device 40 mainly includes a muffler portion 41 and a tail pipe 42.

ここで、図５は図４の点線円Ｖの部分の拡大図であり、矢印ＡＲ１は排気ガスの流れを示す。   Here, FIG. 5 is an enlarged view of a dotted circle V in FIG. 4, and an arrow AR1 indicates the flow of the exhaust gas.

マフラー部４１は、エンジン３１の排気ポート（図示せず。）に接続される部材であり、主に、消音器と、ディーゼル・パティキュレート・フィルタ（ＤＰＦ:Diesel Particulate Filter）と酸化触媒とを含む。ＤＰＦは、ディーゼルエンジンが排出する排気ガス中の粒子状物質(ＰＭ:Particulate Material）を浄化するための排気ガス浄化装置の一種である。   The muffler portion 41 is a member connected to an exhaust port (not shown) of the engine 31 and mainly includes a silencer, a diesel particulate filter (DPF: Diesel Particulate Filter), and an oxidation catalyst. . The DPF is a type of exhaust gas purification device for purifying particulate matter (PM) in exhaust gas discharged from a diesel engine.

テールパイプ４２は、エンジンカバー３０に固定される部材であり、本実施例では、下流部４２０、中流部４２１、及び上流部４２２の３部材で構成される。   The tail pipe 42 is a member that is fixed to the engine cover 30, and is configured by three members of a downstream portion 420, a midstream portion 421, and an upstream portion 422 in this embodiment.

また、テールパイプ４２は、マフラー部４１の下流側（排気ガスの流れにおける下流側）に設置される吐出パイプ４１０の下流側の開口端面４１０Ａを、自身の上流側（排気ガスの流れにおける上流側）の開口端面４２Ｂの内側に非接触で受け入れるように設置される。本実施例では、テールパイプ４２の上流部４２２は下流から上流に向けて拡がり、テールパイプ４２の上流側の開口端面４２Ｂが吐出パイプ４１０の下流側の開口端面４１０Ａよりも大きくなるように形成している。   Further, the tail pipe 42 has an opening end surface 410A on the downstream side of the discharge pipe 410 installed on the downstream side (downstream side in the exhaust gas flow) of the muffler portion 41, and the upstream side (upstream side in the exhaust gas flow). ) To be received without contact inside the open end face 42B. In this embodiment, the upstream portion 422 of the tail pipe 42 extends from the downstream toward the upstream, and the upstream opening end surface 42B of the tail pipe 42 is formed to be larger than the downstream opening end surface 410A of the discharge pipe 410. ing.

次に、図６を参照しながら、吐出パイプ４１０とテールパイプ４２との間の位置関係の詳細について説明する。   Next, details of the positional relationship between the discharge pipe 410 and the tail pipe 42 will be described with reference to FIG.

図６で示すように、テールパイプ４２の下流側の開口端面４２Ａ上の点Ｐ１（例えば、開口端面４２Ａの図中上端である。）と、吐出パイプ４１０の下流側の開口端面４１０Ａ上の点Ｐ２（例えば、開口端面４１０Ａの図中右端である。）とを結ぶ線分Ｐ１−Ｐ２は、交点Ｐ３でテールパイプ４２の壁面を通過する。   As shown in FIG. 6, a point P1 on the opening end face 42A on the downstream side of the tail pipe 42 (for example, the upper end in the drawing of the opening end face 42A) and a point on the opening end face 410A on the downstream side of the discharge pipe 410. A line segment P1-P2 connecting P2 (for example, the right end in the drawing of the opening end surface 410A) passes through the wall surface of the tail pipe 42 at the intersection P3.

また、テールパイプ４２の下流側の開口端面４２Ａ上の点Ｐ４（例えば、開口端面４２Ａの図中下端である。）と、吐出パイプ４１０の下流側の開口端面４１０Ａ上の点Ｐ５（例えば、開口端面４１０Ａの図中左端である。）とを結ぶ線分Ｐ４−Ｐ５は、交点Ｐ６でテールパイプ４２の壁面を通過する。   Further, a point P4 on the opening end surface 42A on the downstream side of the tail pipe 42 (for example, the lower end in the drawing of the opening end surface 42A) and a point P5 on the opening end surface 410A on the downstream side of the discharge pipe 410 (for example, opening) A line segment P4-P5 connecting the end surface 410A to the left end in the drawing passes through the wall surface of the tail pipe 42 at an intersection P6.

これら２つの線分から分かるように、本実施例では、テールパイプ４２の下流側の開口端面４２Ａ上の任意の一点と、吐出パイプ４１０の下流側の開口端面４１０Ａ上の任意の一点とを結ぶ線分の全てがテールパイプ４２の壁面との交点を有する。   As can be seen from these two line segments, in this embodiment, a line connecting an arbitrary point on the opening end surface 42A downstream of the tail pipe 42 and an arbitrary point on the opening end surface 410A downstream of the discharge pipe 410. Every minute has an intersection with the wall of the tail pipe 42.

これは、テールパイプ４２の下流側の開口端面４２Ａを通ってテールパイプ４２の内部に浸入する雨滴の全てがテールパイプ４２の内壁に衝突することを意味する。すなわち、テールパイプ４２の下流側の開口端面４２Ａから浸入した雨滴が直接的に（テールパイプ４２の内壁に衝突することなく）吐出パイプ４１０の下流側の開口端面４１０Ａを通って吐出パイプ４１０の内部に浸入し得ないことを意味する。なお、テールパイプ４２の内壁に衝突した雨滴は、テールパイプ４２の上流部４２２の内壁を伝ってマフラー部４１の外側に至りドレン配管（図示せず。）を通じて外部に排出される。   This means that all raindrops entering the inside of the tail pipe 42 through the opening end surface 42A on the downstream side of the tail pipe 42 collide with the inner wall of the tail pipe 42. That is, raindrops that have entered from the opening end surface 42A on the downstream side of the tail pipe 42 directly pass through the opening end surface 410A on the downstream side of the discharge pipe 410 (without colliding with the inner wall of the tail pipe 42). It means that it cannot penetrate. Raindrops that collide with the inner wall of the tail pipe 42 travel along the inner wall of the upstream portion 422 of the tail pipe 42, reach the outside of the muffler portion 41, and are discharged to the outside through a drain pipe (not shown).

以上の構成により、本発明の実施例に係る排気装置４０は、テールパイプ４２の下流側の開口端面４２Ａから吐出パイプ４１０の下流側の開口端面４１０Ａを直接覗き見ることができない構成とすることで、マフラー部４１の内部への雨滴の浸入を抑制し、マフラー部４１の内部の腐食を抑制することができる。   With the above configuration, the exhaust device 40 according to the embodiment of the present invention is configured such that the downstream opening end surface 410A of the discharge pipe 410 cannot be directly viewed from the downstream opening end surface 42A of the tail pipe 42. Intrusion of raindrops into the inside of the muffler part 41 can be suppressed, and corrosion inside the muffler part 41 can be suppressed.

また、排気装置４０は、上述の構成により、マフラー部４１の内部への雨滴の浸入を抑制し、ＤＰＦの耐久性を向上させることができる。   Moreover, the exhaust apparatus 40 can suppress the penetration of raindrops into the muffler portion 41 and improve the durability of the DPF with the above-described configuration.

なお、本実施例では、吐出パイプ４１０及びテールパイプ４２は何れも円形断面を有するが、楕円形、矩形等の他の断面形状を有していてもよい。   In this embodiment, each of the discharge pipe 410 and the tail pipe 42 has a circular cross section, but may have another cross sectional shape such as an ellipse or a rectangle.

また、本実施例では、テールパイプ４２の下流部４２０及び中流部４２１の径が、吐出パイプ４１０の径とほぼ同じになるように形成されるが、それぞれ異なるように形成されてもよい。   In the present embodiment, the diameters of the downstream portion 420 and the midstream portion 421 of the tail pipe 42 are formed to be substantially the same as the diameter of the discharge pipe 410, but may be formed to be different from each other.

また、本実施例では、マフラー部４１がＤＰＦを含むものとして説明されたが、ＤＰＦを含まないものであってもよい。   Moreover, although the muffler part 41 was demonstrated as what contains DPF in a present Example, you may not contain DPF.

また、本実施例は、テールパイプ４２の下流側の開口端面４２Ａ上の任意の一点と、吐出パイプ４１０の下流側の開口端面４１０Ａ上の任意の一点とを結ぶ線分の全てがテールパイプ４２の壁面との交点を有するという条件を満たす。その上で、本実施例は、テールパイプ４２の下流側の開口端面４２Ａの上端Ｐ１（図６参照。）と吐出パイプ４１０の下流側の開口端面４１０Ａの右端Ｐ２（図６参照。）との間の距離が最短となるテールパイプ４２の形状を採用する。すなわち、線分Ｐ１−Ｐ２が、テールパイプ４２の下流部４２０と中流部４２１との間の接合面上の点Ｐ３でテールパイプ４２の壁と接するように構成されたテールパイプ４２の形状を採用する。しかしながら、本発明に係る排気装置は、テールパイプ４２の重量、材料費、振動強度等の諸条件を満たす限り、上記距離がより長いものとなる（すなわち、線分Ｐ１−Ｐ２がテールパイプ４２の下流部４２０の内壁と交わる）テールパイプ４２の形状を採用するようにしてもよい。   Further, in this embodiment, all the line segments connecting any one point on the opening end surface 42A on the downstream side of the tail pipe 42 and any one point on the opening end surface 410A on the downstream side of the discharge pipe 410 are the tail pipe 42. It satisfies the condition of having an intersection with the wall surface. In addition, in the present embodiment, the upper end P1 (see FIG. 6) of the opening end surface 42A on the downstream side of the tail pipe 42 and the right end P2 (see FIG. 6) of the opening end surface 410A on the downstream side of the discharge pipe 410. The shape of the tail pipe 42 in which the distance between them is the shortest is adopted. That is, the shape of the tail pipe 42 configured such that the line segment P1-P2 is in contact with the wall of the tail pipe 42 at the point P3 on the joint surface between the downstream portion 420 and the midstream portion 421 of the tail pipe 42 is adopted. To do. However, the exhaust device according to the present invention has a longer distance as long as the conditions such as the weight of the tail pipe 42, the material cost, and the vibration strength are satisfied (that is, the line segment P1-P2 is equal to the tail pipe 42). The shape of the tail pipe 42 (which intersects the inner wall of the downstream portion 420) may be adopted.

次に、図７を参照しながら、テールパイプ４２の製造方法について説明する。   Next, a method for manufacturing the tail pipe 42 will be described with reference to FIG.

最初に、図７（Ａ）で示すように、丸パイプＭを用意する。丸パイプＭは、金属（例えば、ステンレス鋼である。）で形成される。なお、本実施例では、１つのテールパイプ４２を構成する１セットの部品群（図５の下流部４２０及び中流部４２１である。）が１つの丸パイプＭから製造されるが、複数セットの部品群が１つの丸パイプＭから製造されてもよい。   First, as shown in FIG. 7A, a round pipe M is prepared. The round pipe M is formed of metal (for example, stainless steel). In the present embodiment, one set of parts (one of the downstream part 420 and the middle part 421 in FIG. 5) constituting one tail pipe 42 is manufactured from one round pipe M. A group of parts may be manufactured from one round pipe M.

その後、図７（Ｂ）の点線Ｃ１、Ｃ２で示す位置で丸パイプＭを切断する。切断位置Ｃ１における切断は、下流部４２０の上流側の開口端面４２０Ｂと、中流部４２１の下流側の開口端面４２１Ａとをもたらす（図７（Ｃ）参照。）。また、切断位置Ｃ２における切断は、下流部４２０の下流側の開口端面、すなわち、テールパイプ４２の下流側の開口端面４２Ａをもたらす（図７（Ｃ）参照。）。なお、開口端面４２０Ｂ、４２１Ａ、及び４２Ａは何れも楕円形状を有し、少なくとも、開口端面４２０Ｂと開口端面４２１Ａとは同じ楕円形状を有する。   Thereafter, the round pipe M is cut at positions indicated by dotted lines C1 and C2 in FIG. The cutting at the cutting position C1 results in an opening end surface 420B on the upstream side of the downstream portion 420 and an opening end surface 421A on the downstream side of the midstream portion 421 (see FIG. 7C). Moreover, the cutting | disconnection in the cutting position C2 brings about the opening end surface of the downstream of the downstream part 420, ie, the opening end surface 42A of the downstream of the tail pipe 42 (refer FIG.7 (C)). The opening end surfaces 420B, 421A, and 42A all have an elliptical shape, and at least the opening end surface 420B and the opening end surface 421A have the same elliptical shape.

また、切断位置Ｃ１における切断角度γ（図７（Ａ）参照。）は、テールパイプ４２の下流部４２０と中流部４２１との間の折れ角ε（図７（Ｄ）参照。）を決定付ける。折れ角εは、切断角度γの２倍（２γ）となる（図７（Ｄ）参照。）。   Further, the cutting angle γ (see FIG. 7A) at the cutting position C1 determines the folding angle ε (see FIG. 7D) between the downstream portion 420 and the midstream portion 421 of the tail pipe 42. . The bending angle ε is twice (2γ) the cutting angle γ (see FIG. 7D).

その後、図７（Ｄ）で示すように、下流部４２０の上流側の開口端面４２０Ｂの向きを１８０度反転させた上で、下流部４２０の上流側の開口端面４２０Ｂと、中流部４２１の下流側の開口端面４２１Ａとを突き合わせて溶接する。   Thereafter, as shown in FIG. 7D, the direction of the opening end surface 420B on the upstream side of the downstream portion 420 is inverted by 180 degrees, and then the opening end surface 420B on the upstream side of the downstream portion 420 and the downstream of the midstream portion 421 The opening end surface 421A on the side is abutted and welded.

その後、図７（Ｅ）で示すように、別途用意された上流部４２２の下流側の開口端面４２２Ａと、中流部４２１の上流側の開口端面４２１Ｂとを突き合わせて溶接する。   Thereafter, as shown in FIG. 7E, a separately prepared opening end surface 422A on the downstream side of the upstream portion 422 and an opening end surface 421B on the upstream side of the midstream portion 421 are brought into contact with each other and welded.

このように、テールパイプ４２の下流部４２０及び中流部４２１は、１つの丸パイプＭに単純な加工のみを施すことによって容易に製造され得ることとなる。   As described above, the downstream portion 420 and the midstream portion 421 of the tail pipe 42 can be easily manufactured by performing only simple processing on one round pipe M.

以上、本発明の好ましい実施例について詳説したが、本発明は、上述した実施例に制限されることはなく、本発明の範囲を逸脱することなしに上述した実施例に種々の変形及び置換を加えることができる。   Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

例えば、上述の実施例において、テールパイプ４２は、下流部４２０、中流部４２１、及び上流部４２２の３部材で構成されるが、１部材、２部材、又は４部材以上で構成されてもよい。   For example, in the above-described embodiment, the tail pipe 42 is configured by three members of the downstream portion 420, the midstream portion 421, and the upstream portion 422, but may be configured by one member, two members, or four members or more. .

１・・・下部走行体 ２・・・旋回機構 ３・・・上部旋回体 ４・・・ブーム ５・・・アーム ６・・・バケット ７・・・ブームシリンダ ８・・・アームシリンダ ９・・・バケットシリンダ １０・・・キャビン ３０・・・エンジンカバー ３１・・・エンジン ３２・・・ラジエタ ３３・・・油圧ポンプ ４０・・・排気装置 ４１・・・マフラー部 ４２・・・テールパイプ ４２Ａ・・・テールパイプの下流側の開口端面 ４２Ｂ・・・テールパイプの上流側の開口端面 ４１０・・・吐出パイプ ４１０Ａ・・・吐出パイプの下流側の開口端面 ４２０・・・テールパイプの下流部 ４２１・・・テールパイプの中流部 ４２２・・・テールパイプの上流部   DESCRIPTION OF SYMBOLS 1 ... Lower traveling body 2 ... Turning mechanism 3 ... Upper turning body 4 ... Boom 5 ... Arm 6 ... Bucket 7 ... Boom cylinder 8 ... Arm cylinder 9 ... Bucket cylinder 10 ... cabin 30 ... engine cover 31 ... engine 32 ... radiator 33 ... hydraulic pump 40 ... exhaust device 41 ... muffler part 42 ... tail pipe 42A ..Open end face 42B on the downstream side of the tail pipe 42 ... Open end face on the upstream side of the tail pipe 410 ... Discharge pipe 410A ... Open end face on the downstream side of the discharge pipe 420 ... Downstream part 421 of the tail pipe ... Middle stream part of tail pipe 422 ... Upstream part of tail pipe

Claims (1)

建設機械のエンジンに接続されたマフラーの吐出パイプと、該吐出パイプの下流側の開口端面を自身の上流側の開口端面の内側に受け入れるテールパイプとを含む建設機械用排気装置であって、
前記テールパイプの下流側の開口端面内の任意の一点と、前記吐出パイプの下流側の開口端面内の任意の一点とを結ぶ線分の全てが、前記テールパイプの壁面との交点を有する、
ことを特徴とする建設機械用排気装置。 An exhaust device for a construction machine comprising a muffler discharge pipe connected to an engine of the construction machine, and a tail pipe for receiving an opening end face on the downstream side of the discharge pipe inside the opening end face on the upstream side thereof,
All of the line segments connecting any one point in the opening end surface on the downstream side of the tail pipe and any one point in the opening end surface on the downstream side of the discharge pipe have an intersection with the wall surface of the tail pipe.
An exhaust device for a construction machine.
JP2011154332A 2011-07-12 2011-07-12 Exhaust equipment for construction machinery Active JP6289796B2 (en)

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Publication number Priority date Publication date Assignee Title
CN104033211A (en) * 2014-06-19 2014-09-10 柳州柳工挖掘机有限公司 Muffler device

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JP2000034742A (en) * 1998-07-16 2000-02-02 Hitachi Constr Mach Co Ltd Exhauster for construction machine
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JP2003313901A (en) * 2002-04-26 2003-11-06 Hitachi Constr Mach Co Ltd Construction machinery
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JPH02141622U (en) * 1989-05-01 1990-11-29
JPH0392521U (en) * 1990-01-09 1991-09-20
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