JP2946876B2 - Engine silencer - Google Patents
Engine silencerInfo
- Publication number
- JP2946876B2 JP2946876B2 JP3270519A JP27051991A JP2946876B2 JP 2946876 B2 JP2946876 B2 JP 2946876B2 JP 3270519 A JP3270519 A JP 3270519A JP 27051991 A JP27051991 A JP 27051991A JP 2946876 B2 JP2946876 B2 JP 2946876B2
- Authority
- JP
- Japan
- Prior art keywords
- passage
- exhaust pressure
- engine
- diaphragm
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
- F01N1/166—Silencing apparatus characterised by method of silencing by using movable parts for changing gas flow path through the silencer or for adjusting the dimensions of a chamber or a pipe
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2390/00—Arrangements for controlling or regulating exhaust apparatus
- F01N2390/06—Arrangements for controlling or regulating exhaust apparatus using pneumatic components only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/14—Plurality of outlet tubes, e.g. in parallel or with different length
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、流路可変消音器の流路
切替えを、エンジン排気圧利用のダイヤフラム式アクチ
ュエータで行うタイプのエンジンの消音装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine muffler of the type in which a flow path of a variable flow path muffler is switched by a diaphragm type actuator utilizing engine exhaust pressure.
【０００２】[0002]
【従来の技術】従来、低速域でのこもり音低減と高速域
での背圧低減を目的として、複数の流路と切替弁を有し
切替弁によって流路が切替えられる可変消音器におい
て、切替弁の駆動をエンジン排気圧利用のダイヤフラム
式アクチュエータで行うようにしたエンジンの消音装置
が提案されている（たとえば、実開平３−３７２２１号
公報）。そこでは、ダイヤフラム式アクチュエータへの
エンジン排気圧力をマフラインレットパイプから取出
し、排気圧伝達通路にてダイヤフラム室に導くようにな
っている。2. Description of the Related Art Conventionally, in order to reduce muffled noise in a low-speed range and back pressure in a high-speed range, a variable muffler having a plurality of flow paths and a switching valve and switching the flow path by a switching valve has been used. 2. Description of the Related Art There has been proposed an engine silencer in which a valve is driven by a diaphragm type actuator using engine exhaust pressure (for example, Japanese Utility Model Laid-Open No. 3-37221). There, the engine exhaust pressure to the diaphragm type actuator is taken out from the muffler linet pipe and guided to the diaphragm chamber through the exhaust pressure transmission passage.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来提案装置
には、次の問題がある。ダイヤフラム室への排気脈動侵
入防止のため排気圧伝達通路の径を小にすると、機関停
止後、通路内に凝着水が溜まり通路を塞ぎ、これが寒冷
地では凍結してアクチュエータの作動を不全にする。逆
に、排気圧伝達通路の径を、凝着水による閉塞が心配な
い程度に大にすると、排気脈動がダイヤフラムに伝わっ
て切替弁が微振動し、ビビリ音が出る。However, the conventionally proposed device has the following problems. If the diameter of the exhaust pressure transmission passage is reduced to prevent exhaust pulsation from entering the diaphragm chamber, coagulated water accumulates in the passage and blocks the passage after the engine stops, which freezes in cold regions and malfunctions the actuator. I do. Conversely, if the diameter of the exhaust pressure transmission passage is increased to such an extent that blockage due to adhesion water is not a concern, exhaust pulsation is transmitted to the diaphragm, and the switching valve vibrates slightly, generating chattering noise.
【０００４】本発明は、排気圧伝達通路を介して排気圧
力をダイヤフラム式アクチュエータに導き、該アクチュ
エータによって流路可変消音器の切替弁を切替えるよう
にしたエンジンの消音装置において、排気圧伝達通路の
凝着水による閉塞と、排気脈動によるビビリ音との両方
を防止することを目的とする。The present invention relates to a silencer for an engine in which exhaust pressure is guided to a diaphragm type actuator through an exhaust pressure transmission passage, and the actuator switches a switching valve of a variable flow path silencer. An object is to prevent both blockage due to adhesion water and chattering noise due to exhaust pulsation.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成する本発
明はつぎの通りである。 （１） 内部に複数の流路を有する消音器、前記複数の
流路を切替可能に前記消音器内に設けられた切替弁、前
記切替弁に連結されて前記切替弁を駆動するダイヤフラ
ム式アクチュエータ、および前記ダイヤフラム式アクチ
ュエータとエンジン排気通路とを連通して排気圧を前記
ダイヤフラム式アクチュエータに伝達する排気圧伝達通
路、を備えたエンジンの消音装置であって、前記ダイヤ
フラム式アクチュエータとエンジン排気通路とを連通す
る前記排気圧伝達通路に、前記排気圧伝達通路の通路断
面積を所定温度以上で絞り前記所定温度未満で拡げる、
通路断面積可変の絞り手段を設けたことを特徴とするエ
ンジンの消音装置。（２） 前記排気圧伝達通路は前記ダイヤフラム式アク
チュエータから前記エンジン排気通路に向かって下がっ
ている（１）記載のエンジンの消音装置。 In order to achieve the object of the present onset to achieve the above purpose
The light is as follows. (1) A muffler having a plurality of flow paths inside, a switching valve provided in the muffler so that the plurality of flow paths can be switched, and a diaphragm-type actuator connected to the switching valve to drive the switching valve , and exhaust pressure transmission passage for transmitting the exhaust pressure to the diaphragm actuator in communication with said diaphragm actuator and an engine exhaust passage, a muffler for an engine wherein the diamond
Connect the flam actuator to the engine exhaust passage
The exhaust pressure transmitting passage, the passage cross-sectional area of the exhaust pressure transmitting passage is throttled above a predetermined temperature and expanded below the predetermined temperature ,
A muffler for an engine, wherein a throttle means having a variable passage cross-sectional area is provided. (2) The exhaust pressure transmission passage is provided with the diaphragm type actuator.
Go down from the tutor toward the engine exhaust passage.
(1) The engine silencer according to (1).
【０００６】[0006]
【作用】上記（１）の本発明のエンジンの消音装置で
は、機関停止時には、雰囲気が低温となって排気ガス中
の水分がダイヤフラム式アクチュエータとエンジン排気
通路とを連通する排気圧伝達通路内に凝縮するが、その
時には絞り手段が開いて通路断面積が大となるので排気
圧伝達通路が凝縮水によって閉塞されない。一方、雰囲
気が高温となって、水分の凝縮のおそれがなくなる機関
運転時には、絞り手段が絞られて通路断面積が絞られる
ので、排気脈動の排気圧伝達通路を介してのダイヤフラ
ムへの伝達が抑えられ、切替弁の振動によるビビリ音も
抑制される。上記（２）の本発明のエンジンの消音装置
では、排気圧伝達通路はダイヤフラム式アクチュエータ
からエンジン排気通路に向かって下がっているので、排
気圧伝達通路の内部に水が凝縮しても自重で管内を流下
してエンジン排気通路に逃げることができ、排気圧伝達
通路が凝縮水によって閉塞されることを確実に防止する
ことができる。 In the engine silencer according to the present invention (1), when the engine is stopped, the temperature of the atmosphere becomes low, and the moisture in the exhaust gas is reduced by the diaphragm actuator and the engine exhaust.
The condensed water is condensed in the exhaust pressure transmitting passage communicating with the passage, but at this time, the throttle means is opened to increase the cross-sectional area of the passage, so that the exhaust pressure transmitting passage is not blocked by the condensed water. On the other hand, at the time of engine operation in which the atmosphere becomes high temperature and there is no danger of water condensation, the throttle means is throttled to narrow the passage cross-sectional area, so that the diaphragm through the exhaust pressure transmission passage of the exhaust pulsation. The transmission to the system is suppressed, and chattering noise due to the vibration of the switching valve is also suppressed. (2) The engine silencer of the present invention described above.
Then, the exhaust pressure transmission passage is a diaphragm type actuator
To the engine exhaust passage,
Even if water condenses inside the pressure transmission passage, it flows down the pipe by its own weight
To escape to the engine exhaust passage and transmit exhaust pressure
Ensures passages are not blocked by condensate
be able to.
【０００７】[0007]
【実施例】図１−図４は本発明の一実施例を示してい
る。図１、図２に示すように、本発明実施例のエンジン
の消音装置は、切替弁３８によって流路が切替えられる
消音器１０、切替弁３８を駆動するためのダイヤフラム
式アクチュエータ４０、エンジン排気圧をダイヤフラム
式アクチュエータ４０に伝達する排気圧伝達通路４８、
排気圧伝達通路４８に設けられた絞り手段５０、を有す
る。1 to 4 show an embodiment of the present invention. As shown in FIGS. 1 and 2, the muffler for an engine according to the embodiment of the present invention includes a muffler 10 whose flow path is switched by a switching valve 38, a diaphragm actuator 40 for driving the switching valve 38, and an engine exhaust pressure. Pressure transmission passage 48 for transmitting pressure to the diaphragm type actuator 40,
A throttle means 50 provided in the exhaust pressure transmission passage 48;
【０００８】消音器１０は、容器１２、容器１２にエン
ジンから排気を導入するインレットパイプ１４、容器１
２からの排気を外気に放出するアウトレットパイプ１６
を有する。The muffler 10 includes a container 12, an inlet pipe 14 for introducing exhaust gas from an engine into the container 12, and a container 1.
Outlet pipe 16 that discharges exhaust gas from outside 2 to the outside air
Having.
【０００９】消音器１０は、内部に、絞られたり拡張さ
れたりする、互いに流れ抵抗の異なる複数の流路を有す
る。たとえば、容器１２は隔壁１８、２０によって、第
１、第２、第３の拡張室２２、２４、２６に区画されて
おり、インレットパイプ１４は第１の拡張室２２に開口
し、アウトレットパイプ１６は第３の拡張室２６に開口
している。第１、第２の拡張室２２、２４は細目のイン
ナパイプ２８で連通され、第２、第３の拡張室２４、２
６は細目のインナパイプ３０で連通されている。一方、
第１、第３の拡張室２２、２６は、第２の拡張室２４を
バイパスする太目のバイパスパイプ３２によって連通さ
れている。この構造によって、室２２、パイプ２８、室
２４、パイプ３０、室２６から成る第１の流路Ａと、室
２２、パイプ３２、室２６から成る第２の流路Ｂとが構
成され、これらの複数の流路は、バイパスパイプ３２に
設けた切替弁３８によって、第１の流路Ａのみを流れる
場合、第１、第２の流路Ａ、Ｂの両方を流れる場合に、
切替えられる。The muffler 10 has a plurality of flow passages having different flow resistances, which are narrowed or expanded. For example, the container 12 is partitioned into first, second, and third expansion chambers 22, 24, and 26 by partition walls 18, 20, and the inlet pipe 14 opens into the first expansion chamber 22, and the outlet pipe 16 Is open to the third expansion chamber 26. The first and second expansion chambers 22 and 24 are communicated with each other by a narrow inner pipe 28, and the second and third expansion chambers 24 and 2 are connected to each other.
6 is communicated with a thin inner pipe 30. on the other hand,
The first and third expansion chambers 22 and 26 are connected by a thick bypass pipe 32 that bypasses the second expansion chamber 24. With this structure, a first flow path A including the chamber 22, the pipe 28, the chamber 24, the pipe 30, and the chamber 26, and a second flow path B including the chamber 22, the pipe 32, and the chamber 26 are configured. When a plurality of flow paths flow through only the first flow path A by the switching valve 38 provided in the bypass pipe 32, and flow through both the first and second flow paths A and B,
Can be switched.
【００１０】切替弁３８の弁軸は容器１２に外に延びて
おり、それをダイヤフラム式アクチュエータ４０によっ
て操作することにより、切替弁３８の切替が行われる。
ダイヤフラム式アクチュエータ４０はエンジンの排気圧
を利用して作動される。より詳しくは、ダイヤフラム式
アクチュエータ４０は、ダイヤフラム４２と、ダイヤフ
ラム４２に連結されたロッド４４と、ダイヤフラム室４
６を有する。そしてロッド４４が切換弁３８の軸にリン
ク５２によって結合される。The valve shaft of the switching valve 38 extends to the outside of the container 12, and the switching of the switching valve 38 is performed by operating the diaphragm shaft actuator 40.
The diaphragm type actuator 40 is operated by using the exhaust pressure of the engine. More specifically, the diaphragm type actuator 40 includes a diaphragm 42, a rod 44 connected to the diaphragm 42, and the diaphragm chamber 4.
6. The rod 44 is connected to the shaft of the switching valve 38 by the link 52.
【００１１】インレットパイプ１４の容器１２への入口
には、インレットパイプ１４を囲むように圧力室３４が
形成されており、インレットパピプ１４には穴３６が穿
設されて圧力室３４にインレットパイプ１４内の排気圧
を導くようになっている。そして、この圧力室３４とダ
イヤフラム室４６とを排気圧伝達通路４８で連通するこ
とにより、排気圧がダイヤフラム室４６に導かれ、排気
圧を利用してダイヤフラム４０を駆動するようになって
いる。A pressure chamber 34 is formed at the entrance of the inlet pipe 14 to the container 12 so as to surround the inlet pipe 14. A hole 36 is formed in the inlet pipe 14, and the inlet chamber 14 is formed in the pressure chamber 34. It is designed to guide the exhaust pressure inside. The pressure chamber 34 and the diaphragm chamber 46 communicate with each other through an exhaust pressure transmission passage 48, whereby the exhaust pressure is guided to the diaphragm chamber 46, and the diaphragm 40 is driven by using the exhaust pressure.
【００１２】また、排気圧伝達通路４８は、図２に示す
ように、ダイヤフラム式アクチュエータ４０からインレ
ットパイプ１４に向かって下っており、内部に水が凝縮
しても自重で管内を流下して圧力室３４に逃せるように
なっている。また、排気圧伝達通路４８はエンジン停止
後に凝縮する水が管内で表面張力で膜となって管を閉塞
しないように、管径を約１０ｍｍ以上にされている。As shown in FIG. 2, the exhaust pressure transmission passage 48 extends downward from the diaphragm type actuator 40 toward the inlet pipe 14. Even if water condenses inside, the exhaust pressure transmission passage 48 flows down the pipe by its own weight to reduce the pressure. The room 34 can be escaped. The exhaust pressure transmission passage 48 has a pipe diameter of about 10 mm or more so that water condensed after the engine is stopped does not form a film due to surface tension in the pipe to block the pipe.
【００１３】排気圧伝達通路４８には、図２−図４に示
すように、絞り手段５０が設けられる。絞り手段５０
は、絞り手段５０が所定温度以上になると排気圧伝達通
路４８の通路断面積を絞り、前記所定温度未満になると
排気圧伝達通路４８の通路断面積を開く手段から成る。
たとえば、絞り手段５０は、たとえば温度が１００度以
上になるとパイプの一端において、断面が図４の星形の
ようになり、温度が１００度より小になると断面が円形
となって開く、形状記憶合金のパイプから成る。このパ
イプは、前記星形と円形とをとる一端と反対側の端部
（この端部は温度の高低によらず円形）にて、排気圧伝
達通路４８の内部に固定されている。The exhaust pressure transmitting passage 48 is provided with a throttle means 50 as shown in FIGS. Diaphragm means 50
The throttle means 50 narrows the cross-sectional area of the exhaust pressure transmission passage 48 when the temperature of the throttle means 50 becomes higher than a predetermined temperature, and opens the cross-sectional area of the exhaust pressure transmission passage 48 when the temperature becomes lower than the predetermined temperature.
For example, the throttle means 50 may be configured such that when the temperature rises to 100 ° C. or higher, the cross section becomes a star shape at one end of the pipe, and when the temperature falls below 100 ° C., the cross section opens and becomes circular. Consists of alloy pipes. The pipe is fixed to the inside of the exhaust pressure transmission passage 48 at an end opposite to the end that takes the shape of a star and a circle (the end is circular regardless of the temperature).
【００１４】つぎに、作用を説明する。エンジン低速域
では、インレットパイプ１４内の圧力は高くないので、
ダイヤフラム式アクチュエータ４０内のダイヤフラム４
２は移動されず、切替弁３８はバイパスパイプ３２を閉
じたままの状態を保つ。したがって、排気は、消音器１
０内の流路Ａを流れ、流れのインナパイプによる絞りと
拡張室による拡張が繰り返されて消音され、アウトレッ
トパイプ１６から排出される。このようにして、低速域
での車室内こもり音が効果的に低減される。Next, the operation will be described. In the low engine speed range, the pressure in the inlet pipe 14 is not high,
Diaphragm 4 in diaphragm actuator 40
2 is not moved, and the switching valve 38 keeps the bypass pipe 32 closed. Therefore, the exhaust is
The air flows through the flow path A in 0, and the flow is repeatedly silenced by the inner pipe and expanded by the expansion chamber to mute the sound and discharged from the outlet pipe 16. In this way, the muffled noise in the vehicle interior in the low-speed range is effectively reduced.
【００１５】エンジン高速域では、インレットパイプ１
４内の圧力が上昇しているので、ダイヤフラム式アクチ
ェエータ４０内のダイヤフラム４２が押されて移動さ
れ、切替弁３８が切替えられてバイパスパイプ３２を開
く。したがって、排気は流路Ａ、Ｂの両方を通って流
れ、流路Ｂの方が流れ抵抗が小さいので、主に流路Ｂを
流れる。このため、消音器流路抵抗が低下し、エンジン
背圧が低下して、エンジンの出力が向上される。このよ
うにして、高速域での出力維持がはかられる。In the high engine speed range, the inlet pipe 1
Since the pressure in 4 is increasing, the diaphragm 42 in the diaphragm type actuator 40 is pushed and moved, and the switching valve 38 is switched to open the bypass pipe 32. Therefore, the exhaust gas flows through both the flow paths A and B, and flows mainly through the flow path B because the flow resistance of the flow path B is smaller. For this reason, the muffler flow path resistance is reduced, the engine back pressure is reduced, and the output of the engine is improved. In this way, the output can be maintained in the high-speed range.
【００１６】つぎに、凝縮水についての作用を説明す
る。機関を停止すると、排気系の温度が低下していき、
残存排気ガス中に含まれている、燃料の燃焼によって生
成された水蒸気が凝縮し、排気圧伝達通路４８の管内壁
に凝着し始める。しかし、この低温状態には、絞り手段
５０は開状態となっており、かつ排気圧伝達通路４８の
径も約１００ｍｍ以上のため、凝着した水が、表面張力
で膜を形成して排気圧伝達通路４８を閉塞するようなこ
とは生じない。Next, the operation of the condensed water will be described. When the engine is stopped, the temperature of the exhaust system decreases,
The water vapor generated by the combustion of the fuel contained in the residual exhaust gas condenses and starts to adhere to the inner wall of the exhaust pressure transmission passage 48. However, in this low temperature state, the throttle means 50 is in the open state, and the diameter of the exhaust pressure transmission passage 48 is about 100 mm or more. It does not occur that the transmission passage 48 is closed.
【００１７】この場合、凝着した水は排気圧伝達通路４
８の傾斜にそってインレットパイプ１４側に流れ、消音
器１０内に出る。したがって、エンジン再始動時、排気
圧伝達通路４８内の水またはそれが氷った氷等による排
気圧伝達通路４８の通路閉塞によって、ダイヤフラム式
アクチュエータ４０の作動に支障が生じることはない。In this case, the adhered water is discharged to the exhaust pressure transmission passage 4.
8 flows toward the inlet pipe 14 along the inclination of 8 and exits into the muffler 10. Therefore, when the engine is restarted, the operation of the diaphragm actuator 40 is not hindered by the passage blockage of the exhaust pressure transmission passage 48 due to water in the exhaust pressure transmission passage 48 or ice that has been icy.
【００１８】一方、機関運転中には、排気圧伝達通路４
８も高温（約１００°以上）となっており、絞り手段５
０が絞り状態にあるに拘らず、排気ガス中の水蒸気は凝
着しない。この時は絞り手段５０は絞り状態となってい
るので、排気脈動のダイヤフラム式アクチュエータ４０
への伝達が抑制され、ダイヤフラム４２の微振動、それ
による切替弁３８の微振動も抑えられ、ビビリ音が発生
しない。On the other hand, during operation of the engine, the exhaust pressure transmission passage 4
8 also has a high temperature (about 100 ° or more),
Water vapor in the exhaust gas does not adhere regardless of whether 0 is in the throttle state. At this time, since the throttle means 50 is in the throttled state, the diaphragm type actuator 40 of the exhaust pulsation.
Is suppressed, and the micro vibration of the diaphragm 42 and the micro vibration of the switching valve 38 due to the micro vibration are also suppressed, so that chattering noise is not generated.
【００１９】[0019]
【発明の効果】請求項１のエンジンの消音装置によれ
ば、ダイヤフラム式アクチュエータとエンジン排気通路
とを連通する排気圧伝達通路に、排気圧伝達通路を所定
温度以上で絞り、前記所定温度未満で開く、通路断面積
可変の絞り手段を設けたので、機関停止時の水分凝着に
よる排気圧伝達通路閉塞等の不都合が生じることもな
く、また機関運転中の排気脈動によるビビリ音の発生も
抑制される。請求項２のエンジンの消音装置によれば、
排気圧伝達通路はダイヤフラム式アクチュエータからエ
ンジン排気通路に向かって下がっているので、排気圧伝
達通路の内部に水が凝縮しても自重で管内を流下してエ
ンジン排気通路に逃げることができ、排気圧伝達通路が
凝縮水によって閉塞されることを確実に防止することが
できる。 According to the first aspect of the present invention, the diaphragm type actuator and the engine exhaust passage are provided.
The exhaust pressure transmission passage is throttled at a predetermined temperature or higher and opened at a temperature lower than the predetermined temperature.
Since the variable throttling means is provided, there is no inconvenience such as a blockage of the exhaust pressure transmission passage due to moisture adhesion when the engine is stopped, and generation of chattering noise due to exhaust pulsation during operation of the engine is suppressed. According to the muffler for an engine of claim 2,
The exhaust pressure transmission passage is
Because it is descending toward the engine exhaust passage, exhaust pressure transmission
Even if water condenses inside the passage, it will flow down the pipe by its own weight and
Can escape to the engine exhaust passage, and the exhaust pressure transmission passage
Be sure to prevent blockage by condensed water
it can.
【図１】本発明の一実施例に係るエンジンの消音装置の
系統図である。FIG. 1 is a system diagram of an engine silencer according to an embodiment of the present invention.
【図２】図１の装置の正面図である。FIG. 2 is a front view of the apparatus of FIG.
【図３】図１の装置のうち絞り手段の側面図である。FIG. 3 is a side view of a diaphragm means in the apparatus of FIG.
【図４】図３の絞り手段の正面図である。FIG. 4 is a front view of the aperture means of FIG. 3;
１０ 消音器 １４ インレットパイプ ３８ 切替弁 ４０ ダイヤフラム式アクチュエータ ４８ 排気圧伝達通路 ５０ 絞り手段 DESCRIPTION OF SYMBOLS 10 Silencer 14 Inlet pipe 38 Switching valve 40 Diaphragm actuator 48 Exhaust pressure transmission passage 50 Throttle means
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F01N 1/08 F01N 1/16 F01N 7/08 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) F01N 1/08 F01N 1/16 F01N 7/08
Claims (2)
切替弁、 前記切替弁に連結されて前記切替弁を駆動するダイヤフ
ラム式アクチュエータ、および前記ダイヤフラム式アク
チュエータとエンジン排気通路とを連通して排気圧を前
記ダイヤフラム式アクチュエータに伝達する排気圧伝達
通路、 を備えたエンジンの消音装置であって、前記ダイヤフラム式アクチュエータとエンジン排気通路
とを連通する 前記排気圧伝達通路に、前記排気圧伝達通
路の通路断面積を所定温度以上で絞り前記所定温度未満
で拡げる、通路断面積可変の絞り手段を設けたことを特
徴とするエンジンの消音装置。1. A muffler having a plurality of flow paths therein, a switching valve provided in the muffler so as to switch the plurality of flow paths, and a diaphragm connected to the switching valve to drive the switching valve An exhaust pressure transmission passage that communicates exhaust pressure to the diaphragm actuator by communicating the diaphragm actuator with an engine exhaust passage, wherein the diaphragm actuator and engine exhaust are provided. aisle
The exhaust pressure transmission passage communicating with the exhaust pressure transmission passage is provided with a throttle means having a variable passage cross-sectional area for narrowing the passage cross-sectional area of the exhaust pressure transmission passage above a predetermined temperature and expanding the cross-section below the predetermined temperature. Silencer.
式アクチュエータから前記エンジン排気通路に向かってFrom the actuator to the engine exhaust passage
下がっている請求項１記載のエンジンの消音装置。The engine silencer according to claim 1, wherein the silencer is lowered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3270519A JP2946876B2 (en) | 1991-09-24 | 1991-09-24 | Engine silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3270519A JP2946876B2 (en) | 1991-09-24 | 1991-09-24 | Engine silencer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0586834A JPH0586834A (en) | 1993-04-06 |
| JP2946876B2 true JP2946876B2 (en) | 1999-09-06 |
Family
ID=17487359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3270519A Expired - Lifetime JP2946876B2 (en) | 1991-09-24 | 1991-09-24 | Engine silencer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2946876B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0733784B1 (en) * | 1995-02-24 | 2004-04-21 | Calsonic Kansei Corporation | Muffler controller for use in controllable exhaust system of internal combustion engine |
| DE19837097B4 (en) * | 1998-08-17 | 2005-06-30 | Dr.Ing.H.C. F. Porsche Ag | Exhaust system of an internal combustion engine |
| CN1408990B (en) | 2002-09-08 | 2012-04-25 | 章国标 | Silencer |
| US8079441B2 (en) | 2002-09-08 | 2011-12-20 | Guobiao Zhang | Muffler |
| JP2015218672A (en) * | 2014-05-19 | 2015-12-07 | 株式会社マキタ | Engine and work machine |
-
1991
- 1991-09-24 JP JP3270519A patent/JP2946876B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0586834A (en) | 1993-04-06 |
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