JPS6113709Y2 - - Google Patents
Info
- Publication number
- JPS6113709Y2 JPS6113709Y2 JP11145281U JP11145281U JPS6113709Y2 JP S6113709 Y2 JPS6113709 Y2 JP S6113709Y2 JP 11145281 U JP11145281 U JP 11145281U JP 11145281 U JP11145281 U JP 11145281U JP S6113709 Y2 JPS6113709 Y2 JP S6113709Y2
- Authority
- JP
- Japan
- Prior art keywords
- intake port
- intake
- swirl
- flow
- guide wall
- 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 9
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【考案の詳細な説明】
本考案は高回転域での過剰スワールを抑制する
ようにした内燃機関の吸気ポート装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake port device for an internal combustion engine that suppresses excessive swirl in a high rotation range.
デイーゼル機関などにおける燃焼改善のために
吸入空気流にスワールを附与し、燃焼時のガス流
動を促進して出力や燃費の向上をはかつている。 To improve combustion in diesel engines, etc., swirl is added to the intake airflow to promote gas flow during combustion, improving output and fuel efficiency.
このため、吸気ポートに吸気弁を中心としてひ
ねりをもたせ、燃焼室に流入する空気に旋回運動
を起こさせたりするが、この場合、吸入空気流速
の低い機関低回転域では十分なスワールが得られ
るように吸気ポートをひねると、吸気流速の高ま
る高回転域で過剰スワール状態となり、燃焼室の
中央で燃料成分が濃くなりすぎ、空気利用率が低
下してスモークが増大したり出力が低下する傾向
があつた。 For this reason, the intake port is twisted around the intake valve to create a swirling motion in the air flowing into the combustion chamber, but in this case, sufficient swirl can be obtained in the low engine speed range where the intake air flow rate is low. When the intake port is twisted in this way, an excessive swirl condition occurs in the high rotation range where the intake flow rate increases, and the fuel components tend to become too concentrated in the center of the combustion chamber, resulting in a decrease in the air utilization rate, resulting in increased smoke and a decrease in output. It was hot.
したがつて吸気ポートのマツチングに際して、
低回転域あるいは高回転域のいずれか一方を犠性
にした仕様とするか、またはいずれも少しづつ犠
性にして中回転域にポイントを置く仕様に設定し
なければならなかつた。 Therefore, when matching the intake ports,
It was necessary to set a specification that sacrificed either the low rotation range or the high rotation range, or a specification that sacrificed a little bit of both and placed emphasis on the middle rotation range.
これに対して例えば実開昭54−84423号や実開
昭54−88408号公報に、吸気ポートの上流に造渦
体や偏向板を設けて、吸気流を制御するものが開
示されているが、これらは、いずれも吸気ポート
の上流で吸気流を偏向させたりしている関係上、
スワールの制御についてはほとんど効果を生じな
い。 On the other hand, for example, Utility Model Application Publication No. 54-84423 and Utility Model Application Publication No. 54-88408 disclose devices in which a vortex forming body or a deflection plate is provided upstream of the intake port to control the intake air flow. , these all deflect the intake air flow upstream of the intake port,
It has almost no effect on swirl control.
本考案はかかる点にかんがみ、機関低回転域で
十分なスワールを生起し、高回転域では過剰スワ
ールを制御するようにした内燃機関の吸気ポート
装置を提供することを目的とする。 In view of this, an object of the present invention is to provide an intake port device for an internal combustion engine that generates sufficient swirl in a low engine speed range and controls excessive swirl in a high engine speed range.
以下、本考案の実施例を図面にもとづいて説明
する。 Hereinafter, embodiments of the present invention will be described based on the drawings.
図は吸気ポート部分の横断面をあらわし、シリ
ンダヘツド１の一部に形成される吸気ポート２
は、入口部３から出口部（吸気弁シート部）４に
向けて、ポート断面がわずかに絞られるテーパ部
５を有する。 The figure shows a cross section of the intake port portion, and the intake port 2 formed in a part of the cylinder head 1.
has a tapered portion 5 in which the port cross section is slightly narrowed from the inlet portion 3 toward the outlet portion (intake valve seat portion) 4.
また出口部４側は吸気弁軸の軸孔６を中心とし
て、略渦巻貝状の旋回部７が形成される。 Further, on the outlet portion 4 side, a substantially spiral shell-shaped swirling portion 7 is formed around the shaft hole 6 of the intake valve shaft.
そして、テーパ部５から旋回部７に移行する連
絡部分には、旋回内側に位置して、吸気流を旋回
外側に向けて案内するガイド壁８が形成されると
ともに、このガイド壁８に対峙するようにして翼
板９が設けられる。 A guide wall 8 that is located on the inside of the swirl and guides the intake air flow toward the outside of the swirl is formed in the connecting portion that transitions from the tapered portion 5 to the swirl portion 7. In this way, the vane plate 9 is provided.
この翼板９はガイド壁８との間隔L1に較べ
て、反対側の外壁１０との間隔L2が大きくとつ
てあり、かつ翼板９とガイド壁８との間の通路
は、下流に向けて断面積が減少するように形成さ
れている。 The blade 9 has a distance L 2 from the outer wall 10 on the opposite side which is larger than the distance L 1 from the guide wall 8, and the passage between the blade 9 and the guide wall 8 is located downstream. It is formed so that the cross-sectional area decreases towards the end.
以上のように構成され、次にその作用について
説明する。 The device is configured as described above, and its operation will be explained next.
機関低回転域では吸気ポート２を流れる空気流
速は相対的に低い。 In a low engine speed range, the air flow rate through the intake port 2 is relatively low.
そして、入口部３からテーパ部５へと流入して
きた空気は翼板９によつて２分され、一方は翼板
９と外壁１０の間を通る外流、他方は翼板９とガ
イド壁８の間を通る内流となり、それぞれ旋回部
７へと流入する。 The air flowing into the tapered part 5 from the inlet part 3 is divided into two parts by the vane plate 9. One part is an external flow passing between the vane plate 9 and the outer wall 10, and the other part is an external flow between the vane plate 9 and the guide wall 8. The internal flow passes between the two and flows into the swirling section 7, respectively.
この場合、外流は旋回部７に対して流入角が小
さいのに対し、内流は翼板９とガイド壁８での間
で絞られて加速されかつ旋回外側へと向けられる
ので流入角も大きく、したがつて内流のもつ旋回
運動エネルギは外流に比較して大きい。 In this case, the outer flow has a small inflow angle with respect to the swirl section 7, whereas the inner flow is constricted between the vane 9 and the guide wall 8, accelerated, and directed toward the outside of the swirl, so that the inflow angle is also large. Therefore, the swirling kinetic energy of the inner flow is greater than that of the outer flow.
低回転域では上述の通り空気流速が低いので、
翼板９を通過後、外流に衝突して内流の旋回運動
が妨げられるにもかかわらず、このときの外流は
流速が低く運動エネルギも小さいため、旋回部７
へと流入する空気流の旋回運動はそれほど減衰し
ない。 As mentioned above, the air flow velocity is low in the low rotation range, so
After passing through the vane plate 9, the swirling movement of the inner stream is impeded by colliding with the outer stream.
The swirling motion of the airflow into the airflow is not significantly damped.
この結果、機関低回転域では十分なスワールを
発生させることができる。 As a result, sufficient swirl can be generated in the low engine speed range.
これに対して機関高回転域では吸入空気量が増
大して吸気ポート２を流れる空気流速は高まる。 On the other hand, in a high engine speed range, the amount of intake air increases and the air flow rate through the intake port 2 increases.
したがつて上記翼板９を境としての外流と内流
は、外流が入口部３からそのままほぼ直進するの
で十分に高い流速をもつて翼板９と外壁１０との
広い通路を流れるのに対し、内流は翼板９とガイ
ド壁８との狭い絞り込まれる通路を流ることによ
り、これが高速域では逆に大きな抵抗となつてそ
れほど内流の旋回運動は助長されない。 Therefore, the outer flow and the inner flow with the vane plate 9 as a boundary, whereas the outer flow advances almost straight from the inlet portion 3 and flows through the wide passage between the vane plate 9 and the outer wall 10 with a sufficiently high flow velocity. Since the internal flow flows through a narrow passage between the vane plate 9 and the guide wall 8, this creates a large resistance in the high-speed range, and the swirling motion of the internal flow is not promoted as much.
この結果、翼板９の通過後に十分に増大した外
流の運動力により内流の旋回運動は規制を受け、
結局、高回転域での過剰スワールが抑御されるの
である。 As a result, the swirling motion of the inner flow is regulated by the kinetic force of the outer flow, which has increased sufficiently after passing through the vane plate 9.
In the end, excessive swirl in the high rotation range is suppressed.
このように本考案によれば、機関低回転域では
十分なスワールを生起して燃焼の安定化をはか
り、高回転域では過剰スワールを抑制し、スモー
ク増加や出力ダウンを防止することができるとい
う効果を生じる。 In this way, according to the present invention, it is possible to generate sufficient swirl in the low engine speed range to stabilize combustion, and to suppress excessive swirl in the high engine speed range, preventing an increase in smoke and a decrease in output. produce an effect.
図面は本考案の実施例をあらわす断面図であ
る。
１……シリンダヘツド、２……吸気ポート、３
……入口部、４……出口部、５……テーパ部、７
……旋回部、８……ガイド壁、９……翼板、１０
……外壁。
The drawing is a sectional view showing an embodiment of the present invention. 1...Cylinder head, 2...Intake port, 3
...Inlet part, 4...Outlet part, 5...Tapered part, 7
... Swivel part, 8 ... Guide wall, 9 ... Wing plate, 10
……outer wall.
Claims (1)
渦巻状の旋回部を形成した内燃機関の吸気ポート
装置において、前記旋回部の内壁に旋回外側へ吸
気流を案内するガイド壁を設けるとともに、この
ガイド壁に対峙しかつ下流に向けて間隔が狭くな
るように翼板を配設したことを特徴とする内燃機
関の吸気ポート装置。 In an intake port device for an internal combustion engine in which a spiral swirling part is formed around an intake valve shaft at the outlet of the intake port, a guide wall is provided on the inner wall of the swirling part to guide the intake air flow to the outside of the swirling part, and An intake port device for an internal combustion engine, characterized in that vanes are disposed facing a guide wall and the spacing becomes narrower toward the downstream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11145281U JPS5816324U (en) | 1981-07-27 | 1981-07-27 | Internal combustion engine intake port device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11145281U JPS5816324U (en) | 1981-07-27 | 1981-07-27 | Internal combustion engine intake port device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5816324U JPS5816324U (en) | 1983-02-01 |
| JPS6113709Y2 true JPS6113709Y2 (en) | 1986-04-28 |
Family
ID=29905791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11145281U Granted JPS5816324U (en) | 1981-07-27 | 1981-07-27 | Internal combustion engine intake port device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5816324U (en) |
-
1981
- 1981-07-27 JP JP11145281U patent/JPS5816324U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5816324U (en) | 1983-02-01 |
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