JPS5939924A - Combustion chamber for diesel engine - Google Patents

Combustion chamber for diesel engine

Info

Publication number
JPS5939924A
JPS5939924A JP57149296A JP14929682A JPS5939924A JP S5939924 A JPS5939924 A JP S5939924A JP 57149296 A JP57149296 A JP 57149296A JP 14929682 A JP14929682 A JP 14929682A JP S5939924 A JPS5939924 A JP S5939924A
Authority
JP
Japan
Prior art keywords
piston
axis
cavity
combustion chamber
recess
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.)
Pending
Application number
JP57149296A
Other languages
Japanese (ja)
Inventor
Takayuki Suzuki
孝幸 鈴木
Shingo Tsuruoka
慎吾 鶴岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hino Motors Ltd
Original Assignee
Hino Motors Ltd
Hino Jidosha Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hino Motors Ltd, Hino Jidosha Kogyo KK filed Critical Hino Motors Ltd
Priority to JP57149296A priority Critical patent/JPS5939924A/en
Publication of JPS5939924A publication Critical patent/JPS5939924A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

PURPOSE:To prevent the recessed position from crack thus to maintain durability by forming a recess in the circumferential wall face of a cavity on the top of a piston of the combustion chamber of a direct injection Diesel engine. CONSTITUTION:A combustion chamber or a cavity 2 is provided in the top face of a piston 1. A pocket recess 4 is formed in the circumferential wall face of a cavity 2 formed between axis X of the piston 3 and axis Y crossing perpendicularly with axis X at the center of the plane of the cavity 2. In other words, said recess 4 is formed at the position keeping away from axis X where the tension is high and axis Y where the compression stress is high. Consequently even when the piston 1 has deformed, the recess forming position is prevented from crack to maintain durability.

Description

【発明の詳細な説明】 本発明は直接噴射式ディーゼルエンジンの燃焼室に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion chamber for a direct injection diesel engine.

本発明の目°的は、ビストノ頂面に受ける爆発圧力によ
るピストンの変形を防止したことである。An object of the present invention is to prevent deformation of the piston due to the explosion pressure applied to the top surface of the piston.

従来、第１図に示すようにピストン１の頂面に燃焼室で
あるキャビティ２を設け、このキャビティ２の周側壁面
に、噴射慾料と空気との混合を促進するために凹陥部が
形成されたものが公知であるが、この凹陥部の配置が悪
いとピストン１が変形する不具合がある。Conventionally, as shown in FIG. 1, a cavity 2, which is a combustion chamber, is provided on the top surface of a piston 1, and a recessed portion is formed on the circumferential wall surface of this cavity 2 to promote mixing of the injection aliment and air. However, if the concave portion is improperly arranged, the piston 1 may be deformed.

すなわｔ１ピストン１の頂面に′爆発圧力を受けると、
第１図に示すように、ピストンピン３の軸心線Ｘ方向上
のキャビティ２の周縁部Ａに引張応力が作用し、また前
記ピストンピン３の軸心線Ｘとキャビティ２の平面中心
で直交する軸線Ｙ上のキャビティ２の周縁部Ｂに圧縮応
力が作用する。その結果、引張応力の作用では第２図に
示すように、ピストン１の頂面がピストンピン３を要と
する扇形状に変形し、また圧縮応力の作用では第３図に
示すように、ピストン上面が中凹み状に変形する。従っ
て、このようにピストン頂面の応力が高い部位に凹陥部
を配置するとキャビティエツジ部に亀裂が生ずる問題が
ある。In other words, when the top surface of t1 piston 1 receives explosive pressure,
As shown in FIG. 1, tensile stress acts on the peripheral edge A of the cavity 2 in the direction of the axis X of the piston pin 3, and the axis X of the piston pin 3 is perpendicular to the center of the plane of the cavity 2. Compressive stress acts on the peripheral edge B of the cavity 2 on the axis Y. As a result, under the action of tensile stress, the top surface of the piston 1 is deformed into a fan shape with the piston pin 3 as the center, as shown in FIG. The top surface is deformed into a hollow shape. Therefore, if the concave portion is disposed at such a portion of the top surface of the piston where the stress is high, there is a problem that cracks may occur at the cavity edge portion.

本発叩けこのような従来の問題を解決すべく特定部位に
凹陥部を形成したことを特長とするものである。以下そ
の実施例を第４図及び第５図によって説明する。In order to solve this conventional problem, the present invention is characterized by the formation of recesses at specific locations. The embodiment will be described below with reference to FIGS. 4 and 5.

１はピストン、２はピストン１の角面に形成した燃焼室
であるキャビティ、３けビストノビンである。1 is a piston, 2 is a cavity which is a combustion chamber formed in the corner of the piston 1, and is a three-bar biston nobbin.

本発明は、前記ビストノビン３の軸心線Ｘと、この軸心
線Ｘと前記キャビティ２の平面中心で直交する軸線Ｙと
の間のキャピテイ２の周側壁面にポケット状の凹陥部４
を形成したものである。The present invention provides a pocket-shaped concave portion 4 on the circumferential wall surface of the cavity 2 between the axis X of the bistonobin 3 and the axis Y that is orthogonal to the axis
was formed.

すなわち、本発明Ｋかいては、引張応力が大きいピスト
ノビ／３の軸心線Ｘ上並びに圧縮応力が大きい軸線Ｙ上
を避けた部位のキャビティ２の周側壁面に凹陥部４を形
成したものである。That is, in the present invention K, the recessed portion 4 is formed on the circumferential side wall surface of the cavity 2 at a portion avoiding the axis line X of the piston nozzle/3 where the tensile stress is large and the axis Y where the compressive stress is large. be.

尚、最も効果的た部位はピストノビ／２の軸心線Ｘから
約４５°方向である。しかしながら、凹陥部４の形状、
面積によって４５°前後にずれた部位でも良い。The most effective position is about 45° from the axis X of the piston knob/2. However, the shape of the recessed portion 4,
Depending on the area, the portion may be shifted around 45 degrees.

よって本発明によれば、第２図及び第３図のようにピス
トンに変形が生じても凹陥部の形成部位の亀裂を防止し
、耐久性を保持する効果がある。Therefore, according to the present invention, even if the piston is deformed as shown in FIGS. 2 and 3, cracks are prevented from forming in the concave portion, and durability is maintained.

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

第１図は一般のピストンの平面−図、第２図及び第３図
はピストンの変形説１１８図；第４図は本発明の平面図
、第５図は第４図ｖ−ｖ線断面図である。。 １・・・ピストン、２・―−キャビティ、３・・・ピス
トンピン、４・―・凹陥部。 第３図 第４図 ■ 第５図Fig. 1 is a plan view of a general piston, Figs. 2 and 3 are 118 views of the deformation theory of the piston; Fig. 4 is a plan view of the present invention, and Fig. 5 is a sectional view taken along the line v-v in Fig. 4. It is. . 1... Piston, 2... Cavity, 3... Piston pin, 4... Recessed part. Figure 3 Figure 4 ■ Figure 5

Claims (1)

【特許請求の範囲】[Claims] ピストン頂面にホヤビテイを設けたものにおいて、ビス
トノピンの軸心線と、この軸心線と前記キャビティの平
面中心で直交する軸線との間のキャビティ周側壁面に凹
陥部を形成したことを特徴とするディーゼルエンジンの
燃焼室。In the piston with a groove provided on the top surface, a concave portion is formed on the circumferential wall surface of the cavity between the axis of the bistonopin and an axis perpendicular to the center of the plane of the cavity. The combustion chamber of a diesel engine.
JP57149296A 1982-08-30 1982-08-30 Combustion chamber for diesel engine Pending JPS5939924A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57149296A JPS5939924A (en) 1982-08-30 1982-08-30 Combustion chamber for diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57149296A JPS5939924A (en) 1982-08-30 1982-08-30 Combustion chamber for diesel engine

Publications (1)

Publication Number Publication Date
JPS5939924A true JPS5939924A (en) 1984-03-05

Family

ID=15472062

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57149296A Pending JPS5939924A (en) 1982-08-30 1982-08-30 Combustion chamber for diesel engine

Country Status (1)

Country Link
JP (1) JPS5939924A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5346508A (en) * 1976-10-09 1978-04-26 Mitsubishi Heavy Ind Ltd Piston in direct fuel-injection type diesel engine
JPS58222915A (en) * 1982-06-21 1983-12-24 Yanmar Diesel Engine Co Ltd Combustion chamber of direct-injection internal-combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5346508A (en) * 1976-10-09 1978-04-26 Mitsubishi Heavy Ind Ltd Piston in direct fuel-injection type diesel engine
JPS58222915A (en) * 1982-06-21 1983-12-24 Yanmar Diesel Engine Co Ltd Combustion chamber of direct-injection internal-combustion engine

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