JPH02118133U

JPH02118133U -

Info

Publication number: JPH02118133U
Application number: JP2661089U
Authority: JP
Priority date: 1989-03-10
Filing date: 1989-03-10
Publication date: 1990-09-21
Anticipated expiration: 2004-03-10
Also published as: JP2524136Y2

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案の一実施例に係る直噴式デイー
ゼルエンジンの燃焼室の平面図、第２図は第１図
の燃焼室の断面図、第３図は燃料反射の状態を示
す第２図の燃焼室の半断面図、第４図は吸気スワ
ールと該吸気スワールによる噴射燃料の偏向を示
す第１図の燃焼室の平面図、である。１０……燃焼室、１２……ピストン、１４……
キヤビテイ、１６……リツプ部、１８……噴射燃
料衝突壁面、１８Ｌ……第１の噴射燃料衝突壁面
部、１８Ｈ……第２の噴射燃料衝突壁面部、２０
……燃料噴射ノズル、２２Ｌ……エンジン低回転
時の噴射燃料、２２Ｈ……エンジン高回転時の噴
射燃料、２２ａ……ピストン上死点前、後の反射
燃料、２２ｂ……ピストン上死点の反射燃料、２
４……キヤビテイ１４の奥部、２６……吸気スワ
ール、２６ａ……第１の流れ、２６ｂ……第２の
流れ、２８……キヤビテイ１４の奥部２４の外周
壁面、３０……突出部、３０ａ……突出部３０の
内周側端部、３２……突出部３０以外のキヤビテ
イ奥部外周壁面部分、３４……角部。 Figure 1 is a plan view of a combustion chamber of a direct injection diesel engine according to an embodiment of the present invention, Figure 2 is a sectional view of the combustion chamber of Figure 1, and Figure 3 is a second diagram showing the state of fuel reflection. FIG. 4 is a plan view of the combustion chamber of FIG. 1 showing the intake swirl and the deflection of the injected fuel by the intake swirl. 10... Combustion chamber, 12... Piston, 14...
Cavity, 16... Lip portion, 18... Injected fuel impingement wall surface, 18L... First injected fuel impingement wall surface section, 18H... Second injected fuel impingement wall surface section, 20
...Fuel injection nozzle, 22L...Injected fuel at low engine speeds, 22H...Injected fuel at high engine speeds, 22a...Reflected fuel before and after piston top dead center, 22b...At piston top dead center Reflective fuel, 2
4... Inner part of the cavity 14, 26... Intake swirl, 26a... First flow, 26b... Second flow, 28... Outer peripheral wall surface of the inner part 24 of the cavity 14, 30... Projection, 30a... Inner peripheral side end of the protrusion 30, 32... Portion of the outer circumferential wall surface of the inner part of the cavity other than the protrusion 30, 34... Corner.

Claims

【実用新案登録請求の範囲】吸気スワールを有する直噴式デイーゼルエンジ
ンの燃焼室であつて、前記燃焼室はピストン頂部
に形成された上方に向つて開口するキヤビテイ内
に郭成され、該キヤビテイの開口部近傍には半径
方向内方に突出し下面がピストン軸芯を含む面内
にて凹曲面に形成されたリツプ部が形成されてい
て該凹曲面を燃料噴射ノズルからの噴射燃料を衝
突、反射させる噴射燃料衝突壁面としており、前
記キヤビテイの奥部は前記噴射燃料衝突壁面より
半径方向外方にえぐられた外周壁面を有している
直噴式デイーゼルエンジンの燃焼室において、前記キヤビテイ奥部の外周壁面は、噴射燃料衝
突壁面でエンジン高回転時に噴射燃料が衝突する
部分の下側に、燃焼室中心方向になめらかに突出
する突出部を有していることを特徴とする直噴式
デイーゼルエンジンの燃焼室。[Claims for Utility Model Registration] A combustion chamber of a direct injection diesel engine having an intake swirl, wherein the combustion chamber is formed in a cavity that opens upward and is formed at the top of a piston, and the combustion chamber has an opening in the cavity. A lip portion is formed near the lip portion that protrudes radially inward and has a lower surface formed as a concave curved surface in a plane that includes the piston axis, and the injected fuel from the fuel injection nozzle collides with and reflects the concave curved surface. In a combustion chamber of a direct injection diesel engine, the inner part of the cavity has an outer circumferential wall surface hollowed out radially outward from the injected fuel impingement wall surface, the outer circumferential wall surface at the inner part of the cavity. is a combustion chamber of a direct-injection diesel engine, which has a protrusion that smoothly protrudes toward the center of the combustion chamber on the lower side of the part of the injected fuel collision wall surface that the injected fuel collides with when the engine rotates at high speed. .