JPH0332758Y2 - - Google Patents
Info
- Publication number
- JPH0332758Y2 JPH0332758Y2 JP8931385U JP8931385U JPH0332758Y2 JP H0332758 Y2 JPH0332758 Y2 JP H0332758Y2 JP 8931385 U JP8931385 U JP 8931385U JP 8931385 U JP8931385 U JP 8931385U JP H0332758 Y2 JPH0332758 Y2 JP H0332758Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- valve
- engine
- passage
- combustion chamber
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 19
- 238000011084 recovery Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Description
【考案の詳細な説明】
(産業上の利用分野)
本考案はエンジンブレーキ装置に関し、詳しく
は排気ブレーキを用いたエンジンブレーキ装置に
関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an engine braking device, and more particularly to an engine braking device using an exhaust brake.
(従来の技術)
トラツク、バス等の大型車両では、長坂路等を
常用ブレーキだけ作動させると、フエードが著し
く、場合によつてはライニングやパツドも機械的
に弱くなるなどの不都合を生じるため、上記ブレ
ーキ以外にエンジン自体によるブレーキングを行
なうことが知られている。(Prior Art) For large vehicles such as trucks and buses, if only the service brake is operated on long slopes, there will be severe fade and in some cases, the lining and pads may become mechanically weak, etc. In addition to the above-mentioned brakes, it is known to perform braking by the engine itself.
エンジン自体のブレーキを行なう方式として
は、エンジン燃焼室に連通する排気通路に開閉弁
を設け、この開閉弁を閉鎖することによつて排気
通路内の排圧を上げエンジンにポンプ作動を行な
わせ、この作動に応じたブレーキを得る排気ブレ
ーキや、このブレーキと協働させて機関行程位相
が圧縮行程上死点近傍にある燃焼室を開放し、こ
の燃焼室に有する排気弁あるいはこれとは別の排
気用弁である第3弁を介して排気通路に排気し、
圧力として燃焼室に蓄えられていたエネルギを放
散させて機関を制動する圧縮ブレーキが知られて
いる。 A method of braking the engine itself is to provide an on-off valve in the exhaust passage that communicates with the engine combustion chamber, and by closing this on-off valve, the exhaust pressure in the exhaust passage is increased and the engine performs a pump operation. An exhaust brake that provides a brake corresponding to this operation, and an exhaust valve that works in conjunction with this brake to open the combustion chamber where the engine stroke phase is near the top dead center of the compression stroke, and an exhaust valve in this combustion chamber or a separate Exhaust to the exhaust passage through the third valve which is the exhaust valve,
Compression brakes are known that brake an engine by dissipating energy stored in the combustion chamber as pressure.
(考案が解決しようとする問題点)
上述したエンジンブレーキにおいて、排気通路
を開閉弁で閉鎖することによつて同通路内での排
圧を上げた場合、エンジンの燃焼室と開閉弁との
間の排気通路内の圧力がきわめて高くなり、この
結果、機関行程位相が排気行程上死点から吸気行
程に変化するとき、燃焼室内の圧力と上記排気通
路内での圧力差がきわめて大きくなり、吸気行程
において燃焼室側の排気弁が開いてしまう事態が
発生する。(Problem to be solved by the invention) In the engine brake described above, if the exhaust pressure in the exhaust passage is increased by closing it with the opening/closing valve, the gap between the combustion chamber of the engine and the opening/closing valve is increased. As a result, when the engine stroke phase changes from top dead center of the exhaust stroke to the intake stroke, the pressure difference between the pressure inside the combustion chamber and the exhaust passage becomes extremely large, and the intake During the stroke, a situation occurs where the exhaust valve on the combustion chamber side opens.
このように吸気行程において開いた排気弁は、
機関行程位相が吸気行程から圧縮行程に転じた
際、ピストンの上昇による燃焼室内の圧力上昇に
よつて弁座に衝突することになり、このことか
ら、弁座の破損を招いたり、排気弁での衝撃応力
が発生したりして、排気弁の機能が失なわれると
いう虞れがあつた。 The exhaust valve opened during the intake stroke in this way,
When the engine stroke phase changes from the intake stroke to the compression stroke, the pressure in the combustion chamber increases due to the rise of the piston, causing it to collide with the valve seat, which may cause damage to the valve seat or damage to the exhaust valve. There was a risk that the exhaust valve would lose its function due to the generation of impact stress.
(問題点を解決するための手段)
本考案は上記に鑑みてなされたものであつて、
上記問題点を解決したエンジンブレーキ装置の提
供を目的とし、その目的を達成するために、排気
通路内での排気方向における排気ブレーキ用開閉
弁の位置よりも上流側に同排気通路内を流動する
排気によつて開放される一方向弁を設け、この一
方向弁と燃焼室の吸気側とを接続して開閉弁が閉
鎖された際の排気圧によつて上記一方向弁を開
け、排気通路内のガスの一部を吸気側に導入する
ようにしたものである。(Means for solving the problem) The present invention was made in view of the above, and
The purpose is to provide an engine braking device that solves the above problems, and in order to achieve that purpose, the flow within the exhaust passage is upstream of the position of the exhaust brake opening/closing valve in the exhaust direction within the exhaust passage. A one-way valve that is opened by exhaust gas is provided, and this one-way valve is connected to the intake side of the combustion chamber, and when the on-off valve is closed, the one-way valve is opened by the exhaust pressure, and the exhaust passage is opened. A part of the gas inside is introduced into the intake side.
(実施例)
以下、図示の実施例によつて本考案を説明す
る。(Example) The present invention will be explained below with reference to the illustrated example.
第1図において、符号1は4サイクルエンジ
ン、同2は吸気路、同3は排気路、同4は開閉
弁、同5は制御装置をそれぞれ示している。 In FIG. 1, reference numeral 1 indicates a four-stroke engine, reference numeral 2 indicates an intake passage, reference numeral 3 indicates an exhaust passage, reference numeral 4 indicates an on-off valve, and reference numeral 5 indicates a control device.
開閉弁4は、エンジン1からの排気路3内に設
けられたバタフライ弁で構成され、制御装置5か
らの指令によつて例えば、図示しないが、空圧駆
動系を介してエンジンブレーキ作動時、排気路3
を閉鎖して吸気の大気への排出を阻止するように
なつている。 The on-off valve 4 is constituted by a butterfly valve provided in the exhaust passage 3 from the engine 1, and is operated in response to a command from the control device 5, for example, when the engine brake is activated via a pneumatic drive system (not shown). Exhaust path 3
The system is designed to close the intake air and prevent it from being discharged into the atmosphere.
上述した制御装置5は、運転席側のエンジンブ
レーキ作動スイツチ(図示されず)およびアクセ
ルペダル連動スイツチ(図示されず)の双方が作
動した時点に、排気路3を閉鎖する向きに開閉弁
4を回動させる指令を出す。 The above-mentioned control device 5 operates the on-off valve 4 in the direction of closing the exhaust path 3 when both the engine brake operation switch (not shown) and the accelerator pedal interlocking switch (not shown) on the driver's seat side are activated. Issue a command to rotate.
そして排気路3内での排気方向における開閉弁
4の上流側には一方向弁6が取付けられている。 A one-way valve 6 is attached to the upstream side of the on-off valve 4 in the exhaust direction in the exhaust path 3.
一方向弁6は、第2図において、排気路3に穿
設されている排気導入口3Aに連通する流入路6
0Aとこの流入路60Aに連通し、吸気路2との
間に接続された回収路7と連通する弁室60Bと
を有する本体60と、この本体60の基部60a
に挿嵌された圧縮ばね61と、この圧縮ばね61
によつて、平生、排気路3側の流入路60Aを塞
ぐ向きの移動習性を付与されている弁板62とで
構成されている。 As shown in FIG.
0A, a valve chamber 60B that communicates with the inlet passage 60A, and a valve chamber 60B that communicates with the recovery passage 7 connected between the intake passage 2, and a base 60a of the main body 60.
The compression spring 61 inserted into the
Therefore, the valve plate 62 is provided with the habit of moving in the direction of closing the inflow passage 60A on the exhaust passage 3 side.
この一方向弁6の開弁圧は、一例として、燃焼
時の最高圧力よりも高く、開閉弁4が排気路3を
閉鎖した排気ブレーキ作動時に燃焼室での排気弁
が開こうとする圧力以下に設定されている。 The opening pressure of this one-way valve 6 is, for example, higher than the maximum pressure during combustion, and lower than the pressure at which the exhaust valve in the combustion chamber attempts to open when the on-off valve 4 closes the exhaust path 3 and the exhaust brake is activated. is set to .
以上のような構成においてエンジンブレーキ作
動時、開閉弁4が排気路3を閉鎖することによつ
て排気路3内の排圧が上昇すると、その排気が上
記設定圧に達した時点で一方向弁6の弁体62が
その付勢に抗して流入路60Aを開放する向きに
変位し、排気路3内の排気の一部を回収路7を介
してエンジン1の吸気路2に導入する。 In the above configuration, when the engine brake is activated, when the on-off valve 4 closes the exhaust passage 3 and the exhaust pressure in the exhaust passage 3 increases, the one-way valve closes the exhaust passage 3 when the exhaust pressure reaches the set pressure. The valve body 62 of No. 6 is displaced in a direction to open the inflow passage 60A against the bias, and a part of the exhaust gas in the exhaust passage 3 is introduced into the intake passage 2 of the engine 1 via the recovery passage 7.
吸気路2内に導入される排気は、例えば、回収
路7内に設けられたクリーナAFによつてカーボ
ン等を除去され、空気として吸気路2内に導入さ
れる。 The exhaust gas introduced into the intake passage 2 has carbon and the like removed by, for example, a cleaner AF provided in the recovery passage 7, and is introduced into the intake passage 2 as air.
吸気路2内に排気路3からの空気が導入される
と、吸気弁を介して燃焼室内に流入する空気量が
増え、これによつて燃焼室内の圧力が高められ、
この結果、燃焼室内と排気路側との圧力差によつ
て開こうとしている排気弁を燃焼室側から押えて
開放を阻止することになる。 When air from the exhaust passage 3 is introduced into the intake passage 2, the amount of air flowing into the combustion chamber through the intake valve increases, thereby increasing the pressure inside the combustion chamber.
As a result, the exhaust valve that is about to open is held down from the combustion chamber side due to the pressure difference between the combustion chamber and the exhaust path side, thereby preventing it from opening.
(考案の効果)
本考案によれば、排気路閉鎖によつて生じる排
圧上昇を、吸気行程時に生じる排気弁の開弁阻止
のために用いることができるので、排気弁の弁座
の破損あるいは排気弁の弁座衝突時に同弁に生じ
る衝撃応力の発生を抑止することができる。(Effects of the invention) According to the invention, the increase in exhaust pressure caused by closing the exhaust passage can be used to prevent the exhaust valve from opening during the intake stroke. It is possible to suppress the generation of impact stress that is generated in the exhaust valve when the valve seat of the exhaust valve collides with the valve seat.
しかも、この排気ブレーキと、前述した圧縮ブ
レーキとを併用した場合には、燃焼室での吸気行
程における空気量が増加しているので、圧縮行程
に転じた際、圧縮仕事量が増加している状態で、
圧縮行程上死点近傍にある燃焼室を排気弁あるい
は第3弁を介して開放することによつて放散され
るエネルギとして蓄えられた圧力がきわめて大き
いのでその放散度が大きいことから制動度合も大
きくなり、効果的なエンジンブレーキの機能が得
られる。 Moreover, when this exhaust brake and the compression brake mentioned above are used together, the amount of air in the intake stroke in the combustion chamber increases, so when the compression stroke shifts, the compression work increases. In the state
When the combustion chamber near the top dead center of the compression stroke is opened via the exhaust valve or the third valve, the pressure stored as energy is extremely large, so the degree of dissipation is large, and the degree of braking is also large. This provides an effective engine braking function.
第1図は本考案実施例の概略図、第2図は第1
図中A部拡大断面図である。
1……エンジン、2……吸気路、3……排気
路、4……開閉弁、6……一方向弁、7……回収
路。
Fig. 1 is a schematic diagram of the embodiment of the present invention, and Fig. 2 is a schematic diagram of the embodiment of the present invention.
It is an enlarged sectional view of part A in the figure. 1...Engine, 2...Intake path, 3...Exhaust path, 4...Opening/closing valve, 6...One-way valve, 7...Recovery path.
Claims (1)
られている開閉弁によつて同排気路を閉鎖した際
に得られるエンジンのポンプ作動によつてブレー
キ力を得るようにしたエンジンブレーキ装置にお
いて、 上記排気路での排気方向における上記開閉弁の
上流側に位置し、上記エンジンの吸気路との間に
接続された排気回収路を有し、排気路での排気圧
が所定値に達したとき、上記排気路と上記排気回
収路とを連通させる一方向弁を設け、 上記一方向弁によつて吸気行程に転じた燃焼室
に排気路からの排気の一部を導入するようにした
ことを特徴とするエンジンブレーキ装置。[Scope of claim for utility model registration] Braking force is obtained by the pump operation of the engine obtained when the exhaust passage is closed by an on-off valve installed in the exhaust passage communicating with the combustion chamber of the engine. The engine braking device has an exhaust gas recovery path located upstream of the opening/closing valve in the exhaust direction of the exhaust path and connected to the intake path of the engine, the exhaust gas recovery path being located at the upstream side of the opening/closing valve in the exhaust direction of the exhaust path, When the exhaust gas reaches a predetermined value, a one-way valve is provided that communicates the exhaust passage with the exhaust gas recovery passage, and the one-way valve directs a portion of the exhaust from the exhaust passage to the combustion chamber that has been switched to the intake stroke. An engine braking device characterized in that it is introduced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8931385U JPH0332758Y2 (en) | 1985-06-13 | 1985-06-13 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8931385U JPH0332758Y2 (en) | 1985-06-13 | 1985-06-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61204934U JPS61204934U (en) | 1986-12-24 |
JPH0332758Y2 true JPH0332758Y2 (en) | 1991-07-11 |
Family
ID=30643267
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8931385U Expired JPH0332758Y2 (en) | 1985-06-13 | 1985-06-13 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0332758Y2 (en) |
-
1985
- 1985-06-13 JP JP8931385U patent/JPH0332758Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS61204934U (en) | 1986-12-24 |
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