JPS6128002Y2 - - Google Patents
Info
- Publication number
- JPS6128002Y2 JPS6128002Y2 JP228681U JP228681U JPS6128002Y2 JP S6128002 Y2 JPS6128002 Y2 JP S6128002Y2 JP 228681 U JP228681 U JP 228681U JP 228681 U JP228681 U JP 228681U JP S6128002 Y2 JPS6128002 Y2 JP S6128002Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- sub
- intake
- exhaust
- main
- 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 12
- 238000005086 pumping Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (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】
本考案はポンピング損失を低域した三弁式内燃
機関に関する。[Detailed Description of the Invention] The present invention relates to a three-valve internal combustion engine with low pumping loss.
一燃焼室あたり２つの吸入弁と１つの排気弁を
配置して該吸入弁の１つ（副吸入弁）を開閉作動
するロツカーアームをロツカーアーム移動機構に
よりベースサークルカム部および開閉カム部間で
移動して低負荷域では主吸入弁のみを開閉し高負
荷域では主・副２つの吸入弁を開閉作動させ、機
関の全運転領域において好ましい特性を有する三
弁式内燃機関が提案されている。しかし、この三
弁式内燃機関では従来の二弁式内燃機関に比較し
て低負荷時のポンピング損失が大きいという欠点
がある。 Two intake valves and one exhaust valve are arranged per combustion chamber, and a Rocker arm that opens and closes one of the intake valves (auxiliary intake valve) is moved between the base circle cam part and the opening/closing cam part by a Rocker arm movement mechanism. A three-valve internal combustion engine has been proposed, which opens and closes only the main intake valve in a low load range and opens and closes two main and auxiliary intake valves in a high load range, and has favorable characteristics in the entire operating range of the engine. However, this three-valve internal combustion engine has the disadvantage that pumping loss at low loads is greater than that of the conventional two-valve internal combustion engine.
しかして、本考案は上述した三弁式内燃機関で
は低負荷運転域で閉塞状態にあつて遊んでいた副
吸入弁を積極的に副排気弁として開閉作動させて
ポンピング損失を低減することを目的としてい
る。 Therefore, the purpose of this invention is to reduce pumping loss by actively opening and closing the auxiliary intake valve, which is closed and idle in the low-load operating range in the three-valve internal combustion engine, as an auxiliary exhaust valve. It is said that
第１図において、機関はシリンダブロツクおよ
びシリンダヘツド１からなり、機関本体に複数の
（第１図には２つのみ示す）燃焼室１′が形成され
ている。機関の全運転領域において開閉作動され
る主吸入弁２および主排気弁３が各燃焼室１′に
設けられている。主吸入弁２に連なる主吸入ポー
ト５および主排気弁３に連なる主排気ポート７が
それぞれシリンダヘツド１に穿設されている。機
関の特定の運転領域において副吸入弁または副排
気弁として開閉作動される第三弁４が各燃焼室に
設けられている。主吸入ポート５に連なる吸入マ
ニホールド９は分岐し副吸入ポート６に連なり、
主排気ポート７に連なる排気マニホールド１０は
分岐し副排気ポート８に連つている。副吸入ポー
ト６および副排気ポート８がシリンダヘツド１に
穿設されており、前記第三弁４は副吸入ポート６
および副排気ポート８に連通している。 In FIG. 1, the engine consists of a cylinder block and a cylinder head 1, and a plurality of combustion chambers 1' (only two shown in FIG. 1) are formed in the engine body. A main intake valve 2 and a main exhaust valve 3, which are opened and closed in all operating ranges of the engine, are provided in each combustion chamber 1'. A main suction port 5 connected to the main intake valve 2 and a main exhaust port 7 connected to the main exhaust valve 3 are provided in the cylinder head 1, respectively. A third valve 4 that is opened and closed as a sub-intake valve or a sub-exhaust valve in a specific operating range of the engine is provided in each combustion chamber. The suction manifold 9 connected to the main suction port 5 branches and connects to the sub suction port 6,
An exhaust manifold 10 connected to the main exhaust port 7 is branched and connected to a sub-exhaust port 8. A sub-intake port 6 and a sub-exhaust port 8 are bored in the cylinder head 1, and the third valve 4 is connected to the sub-intake port 6.
and communicates with the sub-exhaust port 8.
吸入マニホールド９の分岐点と副吸入ポート６
との間に吸気副スロツトル弁１１を揺動可能に枢
着し、該スロツトル弁１１を第１開閉リンク機構
１３に接続して開閉制御されるようにしている。
また排気マニホールド１０の分岐点と副排気ポー
ト８との間に排気副スロツトル弁１２を揺動可能
に枢着し、該スロツトル弁１２を第２開閉リンク
機構１４に接続して開閉制御されるようにしてい
る。 Branch point of suction manifold 9 and sub suction port 6
An intake sub-throttle valve 11 is pivotally mounted between the intake throttle valve 11 and the intake sub-throttle valve 11, and the throttle valve 11 is connected to a first opening/closing link mechanism 13 so as to be controlled to open and close.
Further, an exhaust sub-throttle valve 12 is pivotally mounted between the branch point of the exhaust manifold 10 and the sub-exhaust port 8, and the throttle valve 12 is connected to a second opening/closing link mechanism 14 so that opening and closing can be controlled. I have to.
第２図に本考案の三弁式内燃機関の一気筒分の
動弁機構を示す。機関の長手方向に延在するカム
軸３１を回転可能に支持し、機関のクランク軸
（図示せず）の回転に同期して回転するようにし
ている。カム軸３１に、主吸入弁２を開閉操作す
る主吸入弁カム３３、主排気弁３を開閉操作する
主排気弁カム３５、第三弁４を副吸入弁として作
動させるときに開閉操作するよう所定のカムプロ
フイルを有する副吸入弁カム３７および第三弁４
を副排気弁として作動させるときに開閉操作する
よう所定のカムプロフイルを有する副排気弁カム
３９が止着されている。カム軸３１に平行に第１
ロツカー軸４１を固定支持し、該第１ロツカー軸
４１に主排気弁３開閉用第１ロツカーアーム４３
を揺動可能に支持し、一端を主排気弁カム３５に
当接させ他端を主排気弁３の頭部に当接させてい
る。またカム軸３１に平行し第１ロツカー軸４１
と反対側に第２ロツカー軸５１を固定設置してい
る。第２ロツカー軸５１に主吸入弁２開閉用ロツ
カーアーム４５を揺動可能に支持し、一端を主吸
入弁カム３３に当接させ他端を主吸入弁の頭部に
当接させている。第２ロツカー軸５１に第三弁を
開閉操作する第３ロツカーアーム５３を第２ロツ
カー軸５１まわりに揺動可能でかつ第２ロツカー
軸に沿つて移動可能に設けている。第２ロツカー
軸５１に平行にロツカーアーム移動軸５５をその
軸方向に移動可能に設け、一端５５ａを油圧シリ
ンダ５７のピストンロツド５７ａ等の直線移動機
構に連結している。ロツカーアーム移動軸５５に
止着したフオーク部材５９が第３ロツカーアーム
５３の頭部に突設した突部５４を挾んで係合して
いる。しかして油圧シリンダ５７のピストンロツ
ド５７ａを往復動するとロツカーアーム移動軸５
５が軸方向に移動して第３ロツカーアーム５３を
カム軸３１の軸方向に移動する。従つて第２図に
実線で示す状態では第３ロツカーアーム５３の一
端が副吸入弁カム３７に当接し他端が第三弁４の
頭部に止着した大径のバルブリフタに当接して第
三弁４を副吸入弁として開閉している。次に第３
ロツカーアーム５３を上述のように移動して破線
に示す状態になると第３ロツカーアーム５３の一
端が副排気弁カム３９に当接し他端が第三弁４の
バルブリフタに当接して第三弁を副排気弁として
開閉する。 FIG. 2 shows the valve train for one cylinder of the three-valve internal combustion engine of the present invention. A camshaft 31 extending in the longitudinal direction of the engine is rotatably supported and rotated in synchronization with rotation of a crankshaft (not shown) of the engine. The camshaft 31 includes a main intake valve cam 33 that opens and closes the main intake valve 2, a main exhaust valve cam 35 that opens and closes the main exhaust valve 3, and a main exhaust valve cam 35 that opens and closes the third valve 4 when it is operated as a sub-intake valve. Sub-intake valve cam 37 and third valve 4 having a predetermined cam profile
A sub-exhaust valve cam 39 having a predetermined cam profile is fixedly attached to the sub-exhaust valve cam 39 so as to be opened and closed when the sub-exhaust valve is operated as a sub-exhaust valve. The first parallel to the camshaft 31
A rocker shaft 41 is fixedly supported, and a first rocker arm 43 for opening and closing the main exhaust valve 3 is attached to the first rocker shaft 41.
is swingably supported, and one end is brought into contact with the main exhaust valve cam 35 and the other end is brought into contact with the head of the main exhaust valve 3. Also, a first rocker shaft 41 is parallel to the cam shaft 31.
A second rocker shaft 51 is fixedly installed on the opposite side. A rocker arm 45 for opening and closing the main suction valve 2 is swingably supported on the second rocker shaft 51, and has one end in contact with the main suction valve cam 33 and the other end in contact with the head of the main suction valve. A third rocker arm 53 for opening and closing the third valve is provided on the second rocker shaft 51 so as to be swingable around the second rocker shaft 51 and movable along the second rocker shaft. A rocker arm moving shaft 55 is provided parallel to the second rocker shaft 51 so as to be movable in its axial direction, and one end 55a is connected to a linear moving mechanism such as a piston rod 57a of a hydraulic cylinder 57. A fork member 59 fixed to the rocker arm moving shaft 55 is engaged with a protrusion 54 protruding from the head of the third rocker arm 53 by sandwiching it therebetween. When the piston rod 57a of the hydraulic cylinder 57 reciprocates, the rocker arm movement shaft 5
5 moves in the axial direction to move the third rocker arm 53 in the axial direction of the camshaft 31. Therefore, in the state shown by the solid line in FIG. 2, one end of the third rocker arm 53 contacts the sub-intake valve cam 37, and the other end contacts the large-diameter valve lifter fixed to the head of the third valve 4. Valve 4 is opened and closed as a sub-intake valve. Then the third
When the Rocker arm 53 is moved as described above and reaches the state shown by the broken line, one end of the third Rocker arm 53 contacts the sub-exhaust valve cam 39, and the other end contacts the valve lifter of the third valve 4, causing the third valve to become the sub-exhaust valve. Opens and closes as a valve.
機関の低負荷状態では第２図に示す第３ロツカ
ーアーム５３を破線で示すように位置させ副排気
弁カム３９および第三弁４に当接させて第三弁４
を副排気弁として作動させ、併せて第１図の吸気
副スロツトル弁１１を閉塞する。従つてポンピン
グ損失を低減することができ、しかも排気系から
吸気系へ排気の逆流も生じない。 When the engine is in a low load state, the third rocker arm 53 shown in FIG.
is operated as a sub-exhaust valve, and at the same time, the intake sub-throttle valve 11 shown in FIG. 1 is closed. Therefore, pumping loss can be reduced, and backflow of exhaust gas from the exhaust system to the intake system does not occur.
機関の高負荷状態では第３ロツカーアーム５３
を実線で示すように位置させ副吸入弁カム３７お
よび第三弁４に当接させて第三弁４を副吸入弁と
して作動させ、併せて第１図の排気副スロツトル
弁１２を閉塞する。これにより吸入混合気量を増
大でき大出力を出すことができ、しかも吸入混合
気が排気系へ素通りすることもない。 When the engine is under high load, the third rocker arm 53
is positioned as shown by the solid line and brought into contact with the sub-intake valve cam 37 and the third valve 4, thereby operating the third valve 4 as a sub-intake valve, and at the same time closing the exhaust sub-throttle valve 12 shown in FIG. This allows the amount of intake air mixture to be increased and high output to be produced, and furthermore, the intake air mixture does not pass through to the exhaust system.
第１図は本考案の一実施例の一気筒分の平面
図、第２図は第１図の装置の動弁系の平面図であ
る。
２……主吸入弁、３……主排気弁、４……第三
弁、６……副吸入ポート、８……副排気ポート、
１１……吸気副スロツトル弁、１２……排気副ス
ロツトル弁。
FIG. 1 is a plan view of one cylinder of an embodiment of the present invention, and FIG. 2 is a plan view of the valve train of the apparatus shown in FIG. 2...Main intake valve, 3...Main exhaust valve, 4...Third valve, 6...Sub-intake port, 8...Sub-exhaust port,
11...Intake sub-throttle valve, 12...Exhaust sub-throttle valve.
Claims (1)
燃機関において、第三弁を副吸入ポートおよび副
排気ポートの両者に連通して設け、該両ポートの
第三弁から離隔した側に吸気副スロツトル弁およ
び排気副スロツトル弁をそれぞれ開閉可能に設け
て、機関の低負荷運転域では該吸気副スロツトル
弁を閉塞し第三弁を副排気弁として作動させ、機
関の高負荷運転域では前記排気副スロツトル弁を
閉塞し第三弁を副吸入弁として作動させることを
特徴とする三弁式内燃機関。 In a three-valve internal combustion engine having an intake valve, an exhaust valve, and a third valve, the third valve is provided in communication with both a sub-intake port and a sub-exhaust port, and an intake valve is provided on the side of both ports remote from the third valve. A sub-throttle valve and an exhaust sub-throttle valve are provided so as to be openable and closable, and in a low-load operating range of the engine, the intake sub-throttle valve is closed and the third valve is operated as a sub-exhaust valve, and in a high-load operating range of the engine, the intake sub-throttle valve is closed and the third valve is operated as a sub-exhaust valve. A three-valve internal combustion engine characterized in that an exhaust sub-throttle valve is closed and a third valve is operated as a sub-intake valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP228681U JPS6128002Y2 (en) | 1981-01-13 | 1981-01-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP228681U JPS6128002Y2 (en) | 1981-01-13 | 1981-01-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57115902U JPS57115902U (en) | 1982-07-17 |
| JPS6128002Y2 true JPS6128002Y2 (en) | 1986-08-20 |
Family
ID=29800725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP228681U Expired JPS6128002Y2 (en) | 1981-01-13 | 1981-01-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6128002Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5996405A (en) * | 1982-11-24 | 1984-06-02 | Yamaha Motor Co Ltd | Overhead cam shaft type four-valve engine |
-
1981
- 1981-01-13 JP JP228681U patent/JPS6128002Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57115902U (en) | 1982-07-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1274132A (en) | Valve operating mechanism for internal combustion engine | |
| US5063888A (en) | Exhaust control valve system for parallel multi-cylinder two-cycle engine | |
| US5592907A (en) | Valve operating system for multi-cylinder internal combustion engine | |
| CA2165987A1 (en) | Valve mechanism for an internal combustion engine | |
| US6886532B2 (en) | Intake system of internal combustion engine | |
| JPS60113007A (en) | Control device of intake and exhaust valve in internal- combustion engine | |
| US20040154597A1 (en) | Exhaust gas reflux apparatus for internal combustion engine | |
| US4572117A (en) | Valve arrangement for an internal combustion engine | |
| EP1148217A2 (en) | Intake control device for an internal combustion engine | |
| JPS6128002Y2 (en) | ||
| US4615309A (en) | Valve actuating mechanism for internal combustion engine | |
| JPH0359242B2 (en) | ||
| GB2228533A (en) | I.c.engine valve gear | |
| JPS58167822A (en) | Supercharge device of 4-cycle engine | |
| JPS6024913Y2 (en) | internal combustion engine | |
| JP2704660B2 (en) | Intake device for internal combustion engine | |
| JPS6131145Y2 (en) | ||
| JPS597521Y2 (en) | Diesel engine valve train | |
| JPH0231543Y2 (en) | ||
| JPS6030430Y2 (en) | Internal combustion engine starting accelerator | |
| JPH0221527Y2 (en) | ||
| JP2584769Y2 (en) | OHC internal combustion engine | |
| JP2696249B2 (en) | Intake device for internal combustion engine | |
| JPH039026A (en) | Intake and exhaust device for internal combustion engine | |
| JPS60147534A (en) | Suction device for internal-combustion engine |