JP4231855B2 - Diesel engine vortex chamber combustion chamber - Google Patents
Diesel engine vortex chamber combustion chamber Download PDFInfo
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- JP4231855B2 JP4231855B2 JP2005084244A JP2005084244A JP4231855B2 JP 4231855 B2 JP4231855 B2 JP 4231855B2 JP 2005084244 A JP2005084244 A JP 2005084244A JP 2005084244 A JP2005084244 A JP 2005084244A JP 4231855 B2 JP4231855 B2 JP 4231855B2
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- 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
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Description
本発明は、ディーゼルエンジンの渦室式燃焼室に関し、詳しくは、排気ガス性能の向上を図ることができるディーゼルエンジンの渦室式燃焼室に関するものである。 The present invention relates to a vortex chamber combustion chamber of a diesel engine, and more particularly to a vortex chamber combustion chamber of a diesel engine capable of improving exhaust gas performance.
本発明が前提とするディーゼルエンジンの渦室式燃焼室の構成は、次の通りである。
図4(B)に示すように、シリンダ(1)内のピストン(2)の上死点方向を上、下死点方向を下、シリンダ中心軸線(3)寄りを後、シリンダ周壁(4)寄りを前として、
シリンダ周壁(4)の上方で、シリンダヘッド(5)に上向きに窪むヘッド凹部(6)を設け、このヘッド凹部(6)の入口に口金(7)を嵌め、このヘッド凹部(6)の奥で上向きに窪む渦室上半部(8a)と口金(7)内で下向きに窪む渦室下半部(8b)とで渦室(8)を形成し、シリンダ(1)内に主燃焼室(9)を形成し、口金下壁(10)の後寄りに噴口(11)を設け、この噴口(11)を主燃焼室(9)から渦室(8)に向けて前向きに上り傾斜させ、この噴口(11)で主燃焼室(9)と渦室(8)とを連通させ、渦室上半部(8a)のノズル取付孔(12)から渦室(8)内に燃料噴射ノズル(13)を臨ませた、ディーゼルエンジンの渦室式燃焼室。
The configuration of the vortex chamber combustion chamber of the diesel engine on which the present invention is based is as follows.
As shown in FIG. 4 (B), the top dead center direction of the piston (2) in the cylinder (1) is up, the bottom dead center direction is down, the cylinder center axis (3) is reared, and the cylinder peripheral wall (4) In front of the side
Above the cylinder peripheral wall (4), the cylinder head (5) is provided with a head recess (6) that is recessed upward, and a base (7) is fitted into the inlet of the head recess (6), so that the head recess (6) A vortex chamber (8) is formed by the upper half of the vortex chamber (8a) recessed upward in the back and the lower half (8b) of the vortex chamber recessed downward in the base (7), and is formed in the cylinder (1). A main combustion chamber (9) is formed, and a nozzle hole (11) is provided at the rear of the lower base wall (10). The nozzle hole (11) is directed forward from the main combustion chamber (9) toward the vortex chamber (8). The main combustion chamber (9) and the vortex chamber (8) are communicated with each other through the nozzle hole (11), and the nozzle mounting hole (12) in the upper half (8a) of the vortex chamber enters the vortex chamber (8). A vortex chamber combustion chamber of a diesel engine facing the fuel injection nozzle (13).
この種の渦室式燃焼室では、圧縮行程で主燃焼室の圧縮空気が噴口(11)から渦室(8)内に押し込まれ、渦室(8)の壁面に沿う渦流(22)となり、この渦流(22)に燃料が噴射され、燃料の微粒子が発火し、渦室(8)で燃焼が起こり、燃料ガスと未燃焼燃料が噴口(11)から主燃焼室(9)に噴出し、主燃焼室(9)で燃焼が起こる。
この種の渦室式燃焼室の従来技術としては、特開2004−92579号公報(特許文献1)に示すものがある。
In this type of vortex chamber combustion chamber, the compressed air in the main combustion chamber is pushed into the vortex chamber (8) from the nozzle (11) in the compression stroke, and becomes a vortex flow (22) along the wall surface of the vortex chamber (8). Fuel is injected into this vortex (22), the fuel particulates ignite, combustion occurs in the vortex chamber (8), and fuel gas and unburned fuel are ejected from the nozzle (11) into the main combustion chamber (9). Combustion occurs in the main combustion chamber (9).
As a prior art of this kind of vortex chamber combustion chamber, there is one disclosed in Japanese Patent Application Laid-Open No. 2004-92579 (Patent Document 1).
しかし、この従来の渦室式燃焼室では、真下から見て、燃料噴射ノズルよりも後方であって、噴口の軸線上から左右にずれた位置では、渦流の流速が遅くなり、排気ガス性能が悪くなるが、これに対する特別な対策はなされてないため、問題が生じている。 However, in this conventional vortex chamber combustion chamber, at a position behind the fuel injection nozzle as seen from directly below and shifted to the left and right from the axis of the injection nozzle, the flow velocity of the vortex becomes slow, and the exhaust gas performance is reduced. Although it is worse, no special countermeasures have been taken for this, so there is a problem.
上記従来技術では、次の問題がある。
《問題》 排気ガス性能の向上に限界がある。
渦流の流速が遅くなる位置では、燃料の微粒化や空気との混合が不十分であるため、不完全燃焼が生じ、PM(粒子状物質)が発生しやすい。また、渦流の流速が遅くなる位置では、燃料の微粒化や空気との混合が不十分であるため、発火遅れが生じ、多くの噴射燃料が一時に燃焼し、最高燃焼温度が高まり、NOXが発生しやすい。これらの理由により、排気ガス性能の向上に限界がある。
The above prior art has the following problems.
<Problem> There is a limit to improving exhaust gas performance.
At a position where the flow velocity of the vortex flow becomes slow, fuel atomization and mixing with air are insufficient, so incomplete combustion occurs and PM (particulate matter) is likely to be generated. In addition, at the position where the flow velocity of the vortex flow becomes slow, fuel atomization and mixing with air are insufficient, so that ignition delay occurs, a lot of injected fuel burns at a time, the maximum combustion temperature increases, and NO X Is likely to occur. For these reasons, there is a limit to improving exhaust gas performance.
本発明は、上記問題点を解決することができるディーゼルエンジンの渦室式燃焼室、すなわち、排気ガス性能の向上を図ることができるディーゼルエンジンの渦室式燃焼室を提供することを課題とする。 An object of the present invention is to provide a swirl chamber combustion chamber of a diesel engine that can solve the above-described problems, that is, a swirl chamber combustion chamber of a diesel engine that can improve exhaust gas performance. .
請求項1に係る発明の発明特定事項は、次の通りである。
図4(B)に例示するように、シリンダ(1)内のピストン(2)の上死点方向を上、下死点方向を下、シリンダ中心軸線(3)寄りを後、シリンダ周壁(4)寄りを前として、
シリンダ周壁(4)の上方で、シリンダヘッド(5)に上向きに窪むヘッド凹部(6)を設け、このヘッド凹部(6)の入口に口金(7)を嵌め、ヘッド凹部(6)の奥で上向きに窪む渦室上半部(8a)と口金(7)内で下向きに窪む渦室下半部(8b)とで渦室(8)を形成し、シリンダ(1)内に主燃焼室(9)を形成し、口金下壁(10)の後寄りに噴口(11)を設け、この噴口(11)を主燃焼室(9)から渦室(8)に向けて前向きに上り傾斜させ、この噴口(11)で主燃焼室(9)と渦室(8)とを連通させ、渦室上半部(8a)のノズル取付孔(12)から渦室(8)内に燃料噴射ノズル(15)を臨ませた、ディーゼルエンジンの渦室式燃焼室において、
図1または図2に例示するように、圧縮行程の圧縮熱で渦室(8)の壁面温度よりも早く昇温し、燃焼行程での燃料発火を促進するヒートスポット部材(14)を渦室(8)内に設けるに当たり、
図1(B)または図2(B)に例示するように、真下から見て、燃料噴射ノズル(15)よりも後方であって、噴口軸線(13)上から左右にずれた位置で、渦室上半部(8a)の壁面に左右対になったヒートスポット部材(14)(14)を取り付け、
ヒートスポット部材(14)を、渦室(8)の壁面の素材よりも熱流速が大きい素材で形成した、ことを特徴とするディーゼルエンジンの渦室式燃焼室。
Invention specific matters of the invention according to
As illustrated in FIG. 4B, the top dead center direction of the piston (2) in the cylinder (1) is up, the bottom dead center direction is down, the cylinder center axis (3) is rearward, and the cylinder peripheral wall (4 )
Above the cylinder peripheral wall (4), the cylinder head (5) is provided with a head recess (6) that is recessed upward, and a base (7) is fitted into the inlet of the head recess (6), so that the back of the head recess (6) A vortex chamber (8) is formed by the upper half of the vortex chamber (8a) recessed upward and the lower half of the vortex chamber (8b) recessed downward in the base (7). A combustion chamber (9) is formed, and a nozzle hole (11) is provided on the rear side of the lower base wall (10). The nozzle hole (11) rises forward from the main combustion chamber (9) toward the vortex chamber (8). The main combustion chamber (9) and the vortex chamber (8) are communicated with each other through the nozzle hole (11), and fuel is injected into the vortex chamber (8) from the nozzle mounting hole (12) in the upper half of the vortex chamber (8a). In the vortex chamber combustion chamber of a diesel engine facing the injection nozzle (15),
As illustrated in FIG. 1 or FIG. 2, the heat spot member (14) that raises the temperature faster than the wall surface temperature of the vortex chamber (8) by the compression heat in the compression stroke and promotes fuel ignition in the combustion stroke is provided in the vortex chamber. (8)
As illustrated in FIG. 1 (B) or FIG. 2 (B), the vortex is formed at a position rearward of the fuel injection nozzle (15) and shifted left and right from the nozzle axis (13) when viewed from directly below. A pair of left and right heat spot members (14), (14) are attached to the wall surface of the upper half (8a) ,
A vortex chamber combustion chamber of a diesel engine, characterized in that the heat spot member (14) is formed of a material having a higher heat flow rate than the material of the wall surface of the vortex chamber (8) .
(請求項1に係る発明)
《効果》 排気ガス性能の向上を図ることができる。
図1(B)または図2(B)に例示するように、渦流(22)の流速が遅くなる位置で、渦室上半部(8a)の壁面に左右対のヒートスポット部材(14)(14)を取り付けたので、ヒートスポット部材(14)(14)で燃料の発火が促進され、発火遅れが抑制される。このため、燃焼時間が長くなり、不完全燃焼が抑制され、PM(粒子状物質)の発生が抑制される。また、発火遅れが抑制されるため、燃焼時間が長くなり、最高燃焼温度が抑制され、NOXの発生が抑制される。これらの理由により、排気ガス性能の向上を図ることができる。
(Invention according to Claim 1)
<Effect> The exhaust gas performance can be improved.
As illustrated in FIG. 1 (B) or FIG. 2 (B), a pair of left and right heat spot members (14) (14) (on the wall surface of the upper half (8a) of the vortex chamber at a position where the flow velocity of the vortex (22) becomes slow. Since 14) is attached, the ignition of fuel is promoted by the heat spot members (14) and (14), and the ignition delay is suppressed. For this reason, combustion time becomes long, incomplete combustion is suppressed, and generation | occurrence | production of PM (particulate matter) is suppressed. Further, since the ignition delay is suppressed, the combustion time is lengthened, the maximum combustion temperature is suppressed, and the generation of NO X is suppressed. For these reasons, exhaust gas performance can be improved.
《効果》 排気ガス性能を向上させる機能を高めることができる。
ヒートスポット部材(14)を、渦室(8)の壁面の素材よりも熱流速が大きい素材で形成したので、ヒートスポット部材(14)から渦室(8)内への熱伝達速度が大きい。このため、燃料の発火を促進する機能が高く、排気ガス性能を向上させる機能を高めることができる。
<< Effect >> The function which improves exhaust gas performance can be improved.
Since the heat spot member (14) is formed of a material having a higher heat flow rate than the material of the wall surface of the vortex chamber (8), the heat transfer rate from the heat spot member (14) into the vortex chamber (8) is large. For this reason, the function of promoting the ignition of fuel is high, and the function of improving the exhaust gas performance can be enhanced.
(請求項2に係る発明)
請求項1に係る発明の効果に加え、次の効果を奏する。
《効果》 排気ガス性能を向上させる機能を高めることができる。
図1(B)に例示するように、ヒートスポット部材(14)を、燃料噴射ノズル(15)から噴射される燃料(16)の直撃を避けた位置に配置したので、燃料(16)の直撃によってヒートスポット部材(14)が冷却されることがなく、燃料(16)の発火を促進する機能が高く、排気ガス性能を向上させる機能を高めることができる。
(Invention according to Claim 2 )
In addition to the effect of the invention according to
<< Effect >> The function which improves exhaust gas performance can be improved.
As illustrated in FIG. 1B, since the heat spot member (14) is disposed at a position avoiding direct hit of the fuel (16) injected from the fuel injection nozzle (15), direct hit of the fuel (16). Therefore, the heat spot member (14) is not cooled, the function of promoting the ignition of the fuel (16) is high, and the function of improving the exhaust gas performance can be enhanced.
(請求項3に係る発明)
請求項1または請求項2に係る発明の効果に加え、次の効果を奏する。
《効果》 エンジンの始動性を高めることができる。
図1または図2に例示するように、燃料噴射ノズル(15)よりも後方で、渦室上半部(8a)の壁面のグロープラグ取付孔(19)から渦室(8)内にグロープラグ(20)を突出させたので、エンジンの始動時にはグロープラグ(20)の熱がヒートスポット部材(14)にも伝わり易い。このため、エンジンの始動時にはグロープラグ(20)とヒートスポット部材(14)の両方で燃料の発火を促進することにより、エンジンの始動性を高めることができる。
(Invention according to claim 3 )
In addition to the effect of the invention according to
<Effect> Engine startability can be improved.
As illustrated in FIG. 1 or FIG. 2, the glow plug is inserted into the vortex chamber (8) from the glow plug mounting hole (19) on the wall of the upper half (8a) of the vortex chamber behind the fuel injection nozzle (15). Since (20) is protruded, the heat of the glow plug (20) is easily transferred to the heat spot member (14) when the engine is started. For this reason, when the engine is started, the startability of the engine can be improved by promoting the ignition of fuel by both the glow plug (20) and the heat spot member (14).
本発明の実施の形態を図面に基づいて説明する。図1から図5は本発明の実施形態に係るディーゼルエンジンの渦室式燃焼室を説明する図で、この実施形態では、縦型ディーゼルエンジンの渦室式燃焼室について説明する。 Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 5 are views for explaining a vortex chamber combustion chamber of a diesel engine according to an embodiment of the present invention. In this embodiment, a vortex chamber combustion chamber of a vertical diesel engine will be described.
本発明の実施形態の概要は、次の通りである。
図4(B)に示すように、シリンダブロック(23)の上部にシリンダヘッド(5)を組み付けている。シリンダブロック(23)内にはシリンダ(24)を設けている。シリンダ(1)内のピストン(2)の上死点方向を上、下死点方向を下、シリンダ中心軸線(3)寄りを後、シリンダ周壁(4)寄りを前として、シリンダ周壁(4)の上方で、シリンダヘッド(5)に上向きに窪むヘッド凹部(6)を設け、このヘッド凹部(6)の入口に口金(7)を嵌めている。このヘッド凹部(6)の奥で上向きに窪む渦室上半部(8a)と口金(7)内で下向きに窪む渦室下半部(8b)とで渦室(8)を形成し、シリンダ(1)内に主燃焼室(9)を形成し、口金下壁(10)の後寄りに噴口(11)を設けている。この噴口(11)を主燃焼室(9)から渦室(8)に向けて前向きに上り傾斜させ、この噴口(11)で主燃焼室(9)と渦室(8)とを連通させ、渦室上半部(8a)のノズル取付孔(12)から渦室(8)内に燃料噴射ノズル(15)を臨ませている。
The outline of the embodiment of the present invention is as follows.
As shown in FIG. 4B, the cylinder head (5) is assembled to the upper part of the cylinder block (23). A cylinder (24) is provided in the cylinder block (23). Cylinder peripheral wall (4) with piston (2) in cylinder (1) facing upward, top dead center direction downward, cylinder center axis (3) close, cylinder peripheral wall (4) close Is provided with a head recess (6) that is recessed upward in the cylinder head (5), and a base (7) is fitted into the inlet of the head recess (6). A vortex chamber (8) is formed by the upper half (8a) of the vortex chamber recessed upward in the back of the head recess (6) and the lower half (8b) of the vortex chamber recessed downward in the base (7). The main combustion chamber (9) is formed in the cylinder (1), and the nozzle hole (11) is provided at the rear of the lower base wall (10). The nozzle (11) is inclined upward and forward from the main combustion chamber (9) toward the vortex chamber (8), and the main combustion chamber (9) and the vortex chamber (8) are communicated with each other through the nozzle (11). The fuel injection nozzle (15) faces the vortex chamber (8) from the nozzle mounting hole (12) in the upper half (8a) of the vortex chamber.
渦室での燃料の着火を促進する工夫は、次の通りである。
図1及び図2に示すように、圧縮行程の圧縮熱で渦室(8)の壁面温度よりも早く昇温し、燃焼行程での燃料発火を促進するヒートスポット部材(14)を渦室(8)内に設けるに当たり、図1(B)及び図2(B)に示すように、真下から見て、燃料噴射ノズル(15)よりも後方であって、噴口軸線(13)上から左右にずれた位置で、渦室上半部(8a)の壁面に左右対になったヒートスポット部材(14)(14)を取り付けている。ヒートスポット部材(14)は、渦室(8)の壁面の素材よりも熱流速が大きい素材で形成している。具体的には、渦室上半部(8a)の壁面はシリンダヘッド(5)の素材である鋳鉄、渦室下半部(8b)の壁面は口金(7)の素材である鉄系計合金鋼、ヒートスポット部材(14)は銅である。
The device for promoting the ignition of fuel in the vortex chamber is as follows.
As shown in FIGS. 1 and 2, the heat spot member (14) that raises the temperature faster than the wall surface temperature of the vortex chamber (8) by the compression heat of the compression stroke and promotes fuel ignition in the combustion stroke is changed to the vortex chamber (14). 8) As shown in FIG. 1 (B) and FIG. 2 (B), when it is installed in the interior, it is rearward of the fuel injection nozzle (15) as viewed from directly below and from the nozzle axis (13) to the left and right. At the shifted position, the heat spot members (14), (14) which are paired on the left and right are attached to the wall surface of the upper half (8a) of the vortex chamber. The heat spot member (14) is formed of a material having a larger heat flow rate than the material of the wall surface of the vortex chamber (8). Specifically, the wall of the upper half of the vortex chamber (8a) is cast iron, which is the material of the cylinder head (5), and the wall of the lower half of the vortex chamber (8b) is the ferrous metering alloy, which is the material of the base (7). The steel and heat spot member (14) is copper.
図1(A)に示すように、ヒートスポット部材(14)は、燃料噴射ノズル(15)から噴射される燃料(16)の直撃を避けた位置に配置している。また、燃料噴射ノズル(15)よりも後方で、渦室上半部(8a)の壁面のグロープラグ取付孔(19)から渦室(8)内にグロープラグ(20)を突出させている。 As shown in FIG. 1A, the heat spot member (14) is disposed at a position avoiding direct hit of the fuel (16) injected from the fuel injection nozzle (15). Further, behind the fuel injection nozzle (15), the glow plug (20) protrudes into the vortex chamber (8) from the glow plug mounting hole (19) on the wall surface of the upper half of the vortex chamber (8a).
噴口の構成は、次の通りである。
図3(A)〜(D)に示すように、噴口(11)を主噴口(17)と左右一対の脇溝(18)(18)とで構成し、各脇溝(18)を主噴口(17)の周側で主噴口(17)と連通させている。図3(A)に示すように、主噴口(17)の軸線(17a)と直交する方向に口金(7)を真横から見た場合に、各脇溝(18)の軸線(18a)が主噴口(17)の軸線(17a)よりも後方になるように、各脇溝(18)を配置し、口金下面(7a)に対する各脇溝(18)の軸線(18a)の仰角が、主噴口(17)の軸線(17a)の仰角よりも小さくなるように、各脇溝(18)を方向付けている。主噴口(17)の軸線(17a)の仰角は、45°である。噴口(11)の軸線(13)と主噴口(17)の軸線(17a)とは略重なる。
The structure of the nozzle is as follows.
As shown in FIGS. 3A to 3D, the nozzle hole (11) is composed of a main nozzle hole (17) and a pair of left and right side grooves (18) and (18), and each side groove (18) is formed as a main nozzle hole. It communicates with the main nozzle hole (17) on the peripheral side of (17). As shown in FIG. 3A, when the base (7) is viewed from the side in a direction perpendicular to the axis (17a) of the main nozzle hole (17), the axis (18a) of each side groove (18) is the main axis. The side grooves (18) are arranged so as to be behind the axis (17a) of the nozzle hole (17), and the elevation angle of the axis (18a) of each side groove (18) with respect to the base lower surface (7a) is the main nozzle hole. Each side groove (18) is oriented so as to be smaller than the elevation angle of the axis (17a) of (17). The elevation angle of the axis (17a) of the main nozzle (17) is 45 °. The axis (13) of the nozzle hole (11) and the axis (17a) of the main nozzle hole (17) substantially overlap.
図3(B)〜(D)に示すように、左右一対の脇溝(18)(18)の軸線(18a)(18a)の相互の離間距離が、前方に行くにつれて、次第に狭くなるように、各脇溝(18)を方向付けている。図3(B)〜(D)に示すように、各脇溝(18)の通路断面積が、前方に行くにつれて、次第に小さくなるようにしている。図1(B)及び図2(A)(B)に示すように、圧縮行程で主噴口(17)を通過した圧縮空気は、渦室(8)の左右方向中央部を旋回する中央の渦流(22)となり、脇溝(18)を通過した圧縮空気は、渦室(8)の左右両側を旋回する左右の渦流(25)(25)となる。左右の渦流(25)(25)は、左右に偏向され、渦室(8)の左右両側の空気を撹乱し、空気利用率を高める。図1(B)及び図2(B)に示すように、真下から見て、燃料噴射ノズル(15)よりも後方であって、噴口(11)の軸線(13)上から左右にずれた位置は、中央の渦流(22)と左右の渦流(25)(25)の流速がともに遅くなるため、ここにヒートスポット部材(14)(14)を取り付けている。 As shown in FIGS. 3 (B) to 3 (D), the distance between the axis lines (18a) and (18a) of the pair of left and right side grooves (18) and (18) is gradually reduced toward the front. Each side groove (18) is oriented. As shown in FIGS. 3 (B) to 3 (D), the passage cross-sectional area of each side groove (18) is gradually reduced toward the front. As shown in FIGS. 1 (B), 2 (A), and 2 (B), the compressed air that has passed through the main nozzle (17) in the compression stroke is a central vortex that swirls in the horizontal center of the vortex chamber (8). The compressed air that has passed through the side groove (18) becomes the left and right vortex flows (25) and (25) that swirl on the left and right sides of the vortex chamber (8). The left and right vortex flows (25) and (25) are deflected left and right, disturbing the air on both the left and right sides of the vortex chamber (8), and increasing the air utilization rate. As shown in FIGS. 1 (B) and 2 (B), when viewed from directly below, the position is rearward of the fuel injection nozzle (15) and shifted to the right and left from the axis (13) of the injection port (11). Since the flow speeds of both the central vortex (22) and the left and right vortices (25) and (25) are slow, the heat spot members (14) and (14) are attached thereto.
ヒートスポット部材の形状とその取付構造は、次の通りである。
図5(A)は上記実施形態で用いた基本形のもので、円柱形で、基端部を渦室上半部(8a)の壁面にあけたヒートスポット部材取付孔(26)に圧入して取り付けている。図5(B)に示す第1変更例のものは、基本型の先端に円板部(27)を設けたもので、基端部を渦室上半部(8a)の壁面にあけたヒートスポット部材取付孔(26)に圧入して取り付けている。図5(C)に示す第2変更例のものは、基本型の先端に先拡がりの円錐台部(28)を設けたもので、基端部を渦室上半部(8a)の壁面にあけたヒートスポット部材取付孔(26)に圧入して取り付けている。これらのヒートスポット部材(14)にはいずれも先端に稜(29)が形成されており、この稜(29)とその周辺部分には熱が溜まりやすく、渦室(8)の壁面よりも早く昇温する。
The shape of the heat spot member and its mounting structure are as follows.
FIG. 5 (A) shows the basic shape used in the above embodiment, which is cylindrical and press-fitted into a heat spot member mounting hole (26) whose base end is opened in the wall of the upper half of the vortex chamber (8a). It is attached. The first modified example shown in FIG. 5 (B) has a disk part (27) provided at the tip of the basic mold, and the base end part is opened on the wall surface of the upper half part (8a) of the vortex chamber. The spot
(1) シリンダ(2) ピストン(3) シリンダ中心軸線(4) シリンダ周壁(5) シリンダヘッド(6) 凹部(6a) 窪み(7) 口金(7a) 口金下面(8) 渦室(8a) 渦室上半部(8b) 渦室下半部(9) 主燃焼室(10) 口金下壁(11) 噴口(12) ノズル取付孔(13) 噴口軸線(14) ヒートスポット部材(15) 燃料噴射ノズル(16) 燃料(19) グロープラグ取付孔(20) グロープラグ (1) Cylinder (2) Piston (3) Cylinder center axis (4) Cylinder peripheral wall (5) Cylinder head (6) Recess (6a) Recess (7) Base (7a) Bottom of base (8) Vortex chamber (8a) Vortex Upper chamber half (8b) Vortex chamber lower half (9) Main combustion chamber (10) Base lower wall (11) Port (12) Nozzle mounting hole (13) Port axis (14) Heat spot member (15) Fuel injection Nozzle (16) Fuel (19) Glow plug mounting hole (20) Glow plug
Claims (3)
シリンダ周壁(4)の上方で、シリンダヘッド(5)に上向きに窪むヘッド凹部(6)を設け、このヘッド凹部(6)の入口に口金(7)を嵌め、このヘッド凹部(6)の奥で上向きに窪む渦室上半部(8a)と口金(7)内で下向きに窪む渦室下半部(8b)とで渦室(8)を形成し、シリンダ(1)内に主燃焼室(9)を形成し、口金下壁(10)の後寄りに噴口(11)を設け、この噴口(11)を主燃焼室(9)から渦室(8)に向けて前向きに上り傾斜させ、この噴口(11)で主燃焼室(9)と渦室(8)とを連通させ、渦室上半部(8a)のノズル取付孔(12)から渦室(8)内に燃料噴射ノズル(15)を臨ませた、ディーゼルエンジンの渦室式燃焼室において、
圧縮行程の圧縮熱で渦室(8)の壁面温度よりも早く昇温し、燃焼行程での燃料発火を促進するヒートスポット部材(14)を渦室(8)内に設けるに当たり、
真下から見て、燃料噴射ノズル(15)よりも後方であって、噴口軸線(13)上から左右にずれた位置で、渦室上半部(8a)の壁面に左右対になったヒートスポット部材(14)(14)を取り付け、
ヒートスポット部材(14)を、渦室(8)の壁面の素材よりも熱流速が大きい素材で形成した、ことを特徴とするディーゼルエンジンの渦室式燃焼室。 With the top dead center direction of the piston (2) in the cylinder (1) up, the bottom dead center direction down, the cylinder center axis (3) side rear, the cylinder peripheral wall (4) side front,
Above the cylinder peripheral wall (4), the cylinder head (5) is provided with a head recess (6) that is recessed upward, and a base (7) is fitted into the inlet of the head recess (6), so that the head recess (6) A vortex chamber (8) is formed by the upper half of the vortex chamber (8a) recessed upward in the back and the lower half (8b) of the vortex chamber recessed downward in the base (7), and is formed in the cylinder (1). A main combustion chamber (9) is formed, and a nozzle hole (11) is provided at the rear of the lower base wall (10). The nozzle hole (11) is directed forward from the main combustion chamber (9) toward the vortex chamber (8). The main combustion chamber (9) and the vortex chamber (8) are communicated with each other through the nozzle hole (11), and the nozzle mounting hole (12) in the upper half (8a) of the vortex chamber enters the vortex chamber (8). In the vortex chamber combustion chamber of a diesel engine facing the fuel injection nozzle (15),
In providing the heat spot member (14) in the vortex chamber (8) for raising the temperature faster than the wall temperature of the vortex chamber (8) by the compression heat of the compression stroke and promoting fuel ignition in the combustion stroke,
A heat spot that is paired on the left and right sides of the wall of the upper half (8a) of the vortex chamber at a position that is rearward of the fuel injection nozzle (15) and shifted from the nozzle axis (13) to the left and right when viewed from directly below. Attach members (14) and (14) ,
A vortex chamber combustion chamber of a diesel engine, characterized in that the heat spot member (14) is formed of a material having a higher heat flow rate than the material of the wall surface of the vortex chamber (8).
ヒートスポット部材(14)を、燃料噴射ノズル(15)から噴射される燃料(16)の直撃を避けた位置に配置した、ことを特徴とするディーゼルエンジンの渦室式燃焼室。 In the swirl chamber combustion chamber of the diesel engine according to claim 1 ,
A vortex chamber combustion chamber of a diesel engine, characterized in that the heat spot member (14) is disposed at a position avoiding direct hit of the fuel (16) injected from the fuel injection nozzle (15).
燃料噴射ノズル(15)よりも後方で、渦室上半部(8a)の壁面のグロープラグ取付孔(19)から渦室(8)内にグロープラグ(20)を突出させた、ことを特徴とするディーゼルエンジンの渦室式燃焼室。 In the vortex chamber combustion chamber of the diesel engine according to claim 1 or 2 ,
The glow plug (20) protrudes into the vortex chamber (8) from the glow plug mounting hole (19) on the wall surface of the vortex chamber upper half (8a) behind the fuel injection nozzle (15). A vortex chamber combustion chamber of a diesel engine.
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