WO2017030075A1 - Cylinder head cooling structure - Google Patents
Cylinder head cooling structure Download PDFInfo
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- WO2017030075A1 WO2017030075A1 PCT/JP2016/073643 JP2016073643W WO2017030075A1 WO 2017030075 A1 WO2017030075 A1 WO 2017030075A1 JP 2016073643 W JP2016073643 W JP 2016073643W WO 2017030075 A1 WO2017030075 A1 WO 2017030075A1
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- cooling water
- cylinder head
- flow path
- water introduction
- water flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/36—Cylinder heads having cooling means for liquid cooling
- F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream
Definitions
- This disclosure relates to a cylinder head cooling structure.
- a cooling structure is adopted in which a cooling water passage is provided around the exhaust port and the injector boss to reduce the temperature of the cylinder head.
- Patent Document 1 in a cylinder head having a pair of exhaust ports in each cylinder, exhaust gas extending between the exhaust ports is supplied to supply cooling water between exhaust ports that are likely to become the highest temperature or in the vicinity of an injector boss.
- a cooling structure for a cylinder head having a flow path between ports is disclosed.
- the cooling water supplied to the cylinder head is introduced from a water jacket in the cylinder block to a cooling water introducing portion formed below the exhaust port of the cylinder head.
- the cooling water introduction section is connected to a flow path between exhaust ports, a head bolt boss side flow path that flows in the vicinity of the head bolt boss section, and the like.
- the cooling water introduced from the cylinder block to the cooling water introducing section flows into the flow path beside the head bolt boss without being supplied to the flow path between the exhaust ports where the temperature is high. The cooling efficiency may be reduced.
- the cooling structure of the present disclosure aims to improve the cooling efficiency of the cylinder head by effectively ensuring the cooling water flow rate from the cooling water introduction part of the cylinder head to the flow path between the exhaust ports.
- a plurality of cylinders are arranged in series in the longitudinal direction of the engine, and a pair of exhaust ports are arranged in the cylinder along the longitudinal direction of the engine.
- a cooling structure for a cylinder head provided with a head bolt boss portion, provided below the exhaust port, for introducing a cooling water supplied from the cylinder block side into the cylinder head,
- a first cooling water flow path branched from the cooling water introduction section and extending between the pair of exhaust ports; and at least one second cooling water flow branched from the cooling water introduction section and flowing in the vicinity of the head bolt boss section.
- a projecting portion that protrudes from the cooling water introduction portion by a predetermined amount and narrows the flow path from the cooling water introduction portion to the second cooling water flow passage.
- the cooling water introduction part is provided below the exhaust port in the longitudinal direction of the engine, the first cooling water flow path is provided branched from the longitudinal center of the cooling water introduction part, and the two second A cooling water flow path is provided by branching from both ends in the longitudinal direction of the cooling water introduction part, and the two protrusions are respectively provided from two places between the longitudinal center of the cooling water introduction part and both longitudinal ends. It may be provided protruding.
- the cooling efficiency of the cylinder head can be improved by effectively ensuring the cooling water flow rate from the cooling water introduction portion of the cylinder head to the flow path between the exhaust ports.
- FIG. 1A is a schematic bottom view of a part of the cooling structure of the cylinder head according to the first embodiment as viewed from below (cylinder block side).
- 1B is a cross-sectional view taken along line AA in FIG. 1A.
- FIG. 2A is a schematic bottom view of a part of the cooling structure of the cylinder head according to the second embodiment as viewed from below (cylinder block side).
- 2B is a cross-sectional view taken along line AA in FIG. 2A. It is the typical bottom view which looked at the flow of the cooling water of the cooling structure of the cylinder head concerning other embodiments from the lower part (cylinder block side).
- FIGS. 1A and 1B are views for explaining a cooling structure of a cylinder head according to the first embodiment.
- the cooling structure of this embodiment is applied to a multi-cylinder in-line engine in which a plurality of cylinders are arranged in series in the longitudinal direction (crankshaft direction) of the engine.
- Each cylinder 11A to 11C of the cylinder head 1 has a pair of exhaust ports 12A and B that accommodate two exhaust valves (not shown) and a pair of intake ports 13A and B that respectively accommodate two intake valves (not shown). (Shown only in FIG. 1A) are opposed to each other at an interval. Further, an injector boss portion 14 (shown only in FIG. 1A) for installing an injector (not shown) is provided between the intake ports 13A and B facing the exhaust ports 12A and B.
- An exhaust side head bolt boss portion 15 for inserting a head bolt is provided between the cylinders 11A to 11C on the exhaust side of the cylinder head 1 at intervals. Further, an intake side head bolt boss portion 16 (shown only in FIG. 1A) for inserting a head bolt (not shown) is provided between the respective cylinders 11A to 11C on the intake side of the cylinder head 1 with an interval therebetween. Yes.
- an intake-side cooling water flow path 20 (shown only in FIG. 1A) is provided that extends in the vicinity of the intake ports 13 ⁇ / b> A and B along the longitudinal direction of the engine (hereinafter also referred to as the vertical direction). ing.
- a cooling water outlet (not shown) for returning the cooling water to a radiator (not shown) is provided at the downstream end of the intake-side cooling water channel 20.
- the exhaust side of the cylinder head 1 is provided with an exhaust side cooling water passage 21 (shown only in FIG. 1B) extending above the exhaust ports 12A and B along the longitudinal direction of the engine.
- the downstream side of the exhaust-side cooling water passage 21 is connected to the cooling water outlet (not shown) described above.
- an inter-cylinder cooling water passage 23 extending along the short direction (lateral direction) of the engine is provided.
- the inter-cylinder cooling water passage 23 is formed so as to branch off from the head bolt boss side cooling water passages 27A and B, the details of which will be described later, and the downstream end thereof joins the intake-side cooling water passage 20.
- an inter-intake / exhaust port cooling water passage 24 (shown only in FIG. 1A) extending in the longitudinal direction of the engine is provided.
- the cooling water flow path 24 between intake and exhaust ports branches from the downstream end of the cooling water flow path 26 between exhaust ports, the details of which will be described later, and flows between the intake and exhaust ports 12A and flows between the intake port 13A and the exhaust port 12A.
- the passage 24A and the cooling water flow path 24B between the second intake and exhaust ports flowing between the intake port 13B and the exhaust port 12B are configured.
- a cooling water introduction part 25 for introducing cooling water into the cylinder head 1 from a water jacket of a cylinder block (not shown) is provided in the longitudinal direction of the engine.
- the cooling water introducing portion 25 is provided with flow passage restricting protrusions 30A and 30B, the details of which will be described later.
- an inter-exhaust-port cooling water flow path (first cooling water flow path) 26 extending in the short direction of the engine is provided.
- the inter-exhaust-port cooling water flow path 26 is formed so as to branch from substantially the center in the longitudinal direction of the cooling water introducing portion 25 and to have its downstream end merged with the inter-intake / exhaust-port cooling water flow path 24 in the vicinity of the injector boss portion 14. ing.
- Head bolt boss side cooling water flow paths (second cooling water flow paths) 27A, B are provided between each exhaust port 12A, B of the cylinder head 1 and the exhaust side head bolt boss part 15.
- Head bolt boss side cooling water flow paths 27 ⁇ / b> A and B are formed so as to merge with the upstream end of the inter-cylinder cooling water flow path 23, and the downstream end thereof merges with the exhaust-side cooling water flow path 21.
- an exhaust-side supply flow path 28 (FIG. 1B) extends upward from the inter-exhaust-port cooling water flow path 26 and has its downstream end merged with the exhaust-side cooling water flow path 21. (Only shown in Fig. 1).
- the flow restricting protrusions 30A and B are provided so as to protrude in the cooling water introduction part 25 downward from the exhaust ports 12A and B by a predetermined protrusion amount.
- a predetermined gap is secured between the projecting ends of the flow restricting protrusions 30A and 30B and the lower inner wall surface of the cooling water introducing part 25, and the flow restricting protrusions 30A and 30B are appropriately projected appropriately.
- the amount of protrusion of the flow path restricting protrusions 30A and 30B is appropriately set to an optimum value, By restricting the flow path to the cooling water flow paths 27A and 27B, it becomes possible to effectively secure the flow rate of the cooling water supplied to the cooling water flow path 26 between the exhaust ports, and to improve the cooling efficiency of the cylinder head 1. Can do.
- FIGSecond Embodiment 2A and 2B are views for explaining a cooling structure of the cylinder head according to the second embodiment.
- the cooling structure of the second embodiment is obtained by replacing the flow restrictor protrusions 30A, B of the first embodiment with flow passage blocking protrusions 31A, B. Since other configurations are substantially the same as those of the first embodiment, detailed description thereof is omitted.
- the flow path blocking projections 31A, B are provided so as to protrude downward from the flow path wall on the exhaust port 12A, B side of the cooling water introduction section 25 to the bottom of the cylinder head 1. That is, the flow path blocking projections 31A and 31B branch the inside of the cooling water introduction part 25 into the central region in the longitudinal direction that branches from the inter-exhaust-port cooling water flow path 26 and the head bolt boss side cooling water flow paths 27A and B. It is configured so as to be completely blocked by the regions at both ends in the longitudinal direction.
- the cooling water flow direction of the cooling water flow path 26 between the exhaust ports may be configured to flow in the opposite direction.
- the cooling structure of the cylinder head according to the present disclosure can improve the cooling efficiency of the cylinder head by effectively ensuring the cooling water flow rate from the cooling water introduction part of the cylinder head to the flow path between the exhaust ports. Useful in.
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
A cooling structure for a cylinder head 1 in which a plurality of cylinders 11A-11C are arranged in series in the lengthwise direction of an engine, exhaust ports 12A, 12B are arranged in the cylinders 11A-11C along the lengthwise direction of the engine, and head bolt boss parts 15 are provided on the exhaust side between the cylinders 11A-11C, said cooling structure being equipped with: cooling water introduction parts 25 that are provided under the exhaust ports 12A, 12B and introduce cooling water supplied from the cylinder block side into the interior of the cylinder head 1; first cooling water flow paths 26 branching from the cooling water introduction parts 25 and extending between the pairs of exhaust ports 12A, 12B; one or more second cooling water flow paths 27A, 27B branching from the cooling water introduction parts 25 and running in the vicinity of the head bolt boss parts 15; and protrusions 30A, 30B that are provided inside the cooling water introduction parts 25 so as to protrude by a prescribed amount, and that constrict the flow paths from the cooling water introduction parts 25 to the second cooling water flow paths 27A, 27B.
Description
本開示は、シリンダヘッドの冷却構造に関する。
This disclosure relates to a cylinder head cooling structure.
一般的に、シリンダヘッドの触火面は高温になりやすいため、排気ポートやインジェクタボス部の周囲に冷却水流路を設けて、シリンダヘッドの温度低減を図る冷却構造が採用されている。
Generally, since the contact surface of the cylinder head is likely to become hot, a cooling structure is adopted in which a cooling water passage is provided around the exhaust port and the injector boss to reduce the temperature of the cylinder head.
例えば、特許文献１には、各気筒に一対の排気ポートを備えたシリンダヘッドにおいて、最も高温になりやすい排気ポート間やインジェクタボス部近傍に冷却水を供給するため、各排気ポート間を延びる排気ポート間流路を備えたシリンダヘッドの冷却構造が開示されている。
For example, in Patent Document 1, in a cylinder head having a pair of exhaust ports in each cylinder, exhaust gas extending between the exhaust ports is supplied to supply cooling water between exhaust ports that are likely to become the highest temperature or in the vicinity of an injector boss. A cooling structure for a cylinder head having a flow path between ports is disclosed.
一般的に、シリンダヘッドに供給される冷却水は、シリンダブロック内のウォータジャケットからシリンダヘッドの排気ポート下方に形成された冷却水導入部に導入される。この冷却水導入部には、排気ポート間流路や、ヘッドボルトボス部の近傍を流れるヘッドボルトボス脇流路等が接続されている。このような流路構造においては、シリンダブロックから冷却水導入部に導入された冷却水が、温度の高い排気ポート間流路に供給されずにヘッドボルトボス脇流路へ流れてしまい、シリンダヘッドの冷却効率を低下させてしまう可能性がある。
Generally, the cooling water supplied to the cylinder head is introduced from a water jacket in the cylinder block to a cooling water introducing portion formed below the exhaust port of the cylinder head. The cooling water introduction section is connected to a flow path between exhaust ports, a head bolt boss side flow path that flows in the vicinity of the head bolt boss section, and the like. In such a flow path structure, the cooling water introduced from the cylinder block to the cooling water introducing section flows into the flow path beside the head bolt boss without being supplied to the flow path between the exhaust ports where the temperature is high. The cooling efficiency may be reduced.
本開示の冷却構造は、シリンダヘッドの冷却水導入部から排気ポート間流路への冷却水流量を効果的に確保することで、シリンダヘッドの冷却効率を向上することを目的とする。
The cooling structure of the present disclosure aims to improve the cooling efficiency of the cylinder head by effectively ensuring the cooling water flow rate from the cooling water introduction part of the cylinder head to the flow path between the exhaust ports.
本開示の冷却構造は、エンジンの長手方向に複数の気筒が直列に配置され、前記気筒には一対の排気ポートが前記エンジンの長手方向に沿ってそれぞれ配置され、各気筒間の排気側にはヘッドボルトボス部がそれぞれ設けられたシリンダヘッドの冷却構造であって、前記排気ポートの下方に設けられて、シリンダブロック側から供給される冷却水をシリンダヘッド内に導入する冷却水導入部と、前記冷却水導入部から分岐して前記一対の排気ポート間を延びる第１冷却水流路と、前記冷却水導入部から分岐して前記ヘッドボルトボス部の近傍を流れる少なくとも一本の第２冷却水流路と、前記冷却水導入部内に所定の突出量で突出して設けられて、前記冷却水導入部から前記第２冷却水流路への流路を絞る突起部と、を備える。
In the cooling structure of the present disclosure, a plurality of cylinders are arranged in series in the longitudinal direction of the engine, and a pair of exhaust ports are arranged in the cylinder along the longitudinal direction of the engine. A cooling structure for a cylinder head provided with a head bolt boss portion, provided below the exhaust port, for introducing a cooling water supplied from the cylinder block side into the cylinder head, A first cooling water flow path branched from the cooling water introduction section and extending between the pair of exhaust ports; and at least one second cooling water flow branched from the cooling water introduction section and flowing in the vicinity of the head bolt boss section. And a projecting portion that protrudes from the cooling water introduction portion by a predetermined amount and narrows the flow path from the cooling water introduction portion to the second cooling water flow passage.
前記突起部が前記冷却水導入部の上側流路壁から下方に向かって前記シリンダヘッドの底部まで延設されて、当該冷却水導入部内を前記第１冷却水流路が分岐する領域と、前記第２冷却水流路が分岐する領域とに遮断するものであってもよい。
A region in which the protrusion extends from the upper flow path wall of the cooling water introduction part to the bottom of the cylinder head and the first cooling water flow path branches in the cooling water introduction part; 2 You may interrupt | block to the area | region where a cooling water flow path branches.
前記冷却水導入部が、前記排気ポートの下方にエンジンの長手方向に設けられ、前記第１冷却水流路が前記冷却水導入部の長手方向中央から分岐して設けられ、二本の前記第２冷却水流路が前記冷却水導入部の長手方向両端からそれぞれ分岐して設けられ、二個の前記突起部が前記冷却水導入部の長手方向中央と長手方向両端との間の二か所からそれぞれ突出して設けられてもよい。
The cooling water introduction part is provided below the exhaust port in the longitudinal direction of the engine, the first cooling water flow path is provided branched from the longitudinal center of the cooling water introduction part, and the two second A cooling water flow path is provided by branching from both ends in the longitudinal direction of the cooling water introduction part, and the two protrusions are respectively provided from two places between the longitudinal center of the cooling water introduction part and both longitudinal ends. It may be provided protruding.
本開示の冷却構造によれば、シリンダヘッドの冷却水導入部から排気ポート間流路への冷却水流量を効果的に確保することで、シリンダヘッドの冷却効率を向上することができる。
According to the cooling structure of the present disclosure, the cooling efficiency of the cylinder head can be improved by effectively ensuring the cooling water flow rate from the cooling water introduction portion of the cylinder head to the flow path between the exhaust ports.
以下、添付図面に基づいて、本開示の各実施形態に係るシリンダヘッドの冷却構造を説明する。同一の部品には同一の符号を付してあり、それらの名称および機能も同じである。したがって、それらについての詳細な説明は繰返さない。
Hereinafter, a cylinder head cooling structure according to each embodiment of the present disclosure will be described with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
［第一実施形態］
図１Ａ，図１Ｂは、第一実施形態に係るシリンダヘッドの冷却構造を説明する図である。本実施形態の冷却構造は、複数の気筒がエンジンの長手方向（クランク軸方向）に直列に配置された多気筒直列エンジンに適用される。 [First embodiment]
1A and 1B are views for explaining a cooling structure of a cylinder head according to the first embodiment. The cooling structure of this embodiment is applied to a multi-cylinder in-line engine in which a plurality of cylinders are arranged in series in the longitudinal direction (crankshaft direction) of the engine.
図１Ａ，図１Ｂは、第一実施形態に係るシリンダヘッドの冷却構造を説明する図である。本実施形態の冷却構造は、複数の気筒がエンジンの長手方向（クランク軸方向）に直列に配置された多気筒直列エンジンに適用される。 [First embodiment]
1A and 1B are views for explaining a cooling structure of a cylinder head according to the first embodiment. The cooling structure of this embodiment is applied to a multi-cylinder in-line engine in which a plurality of cylinders are arranged in series in the longitudinal direction (crankshaft direction) of the engine.
シリンダヘッド１の各気筒１１Ａ～Ｃには、図示しない二本の排気バルブをそれぞれ収容した一対の排気ポート１２Ａ，Ｂ及び、図示しない二本の吸気バルブをそれぞれ収容した一対の吸気ポート１３Ａ，Ｂ（図１Ａにのみ示す）がそれぞれ間隔を隔てて対向配置されている。また、各排気ポート１２Ａ，Ｂ間に臨む吸気ポート１３Ａ，Ｂ間には、図示しないインジェクタを設置するためのインジェクタボス部１４（図１Ａにのみ示す）が設けられている。
Each cylinder 11A to 11C of the cylinder head 1 has a pair of exhaust ports 12A and B that accommodate two exhaust valves (not shown) and a pair of intake ports 13A and B that respectively accommodate two intake valves (not shown). (Shown only in FIG. 1A) are opposed to each other at an interval. Further, an injector boss portion 14 (shown only in FIG. 1A) for installing an injector (not shown) is provided between the intake ports 13A and B facing the exhaust ports 12A and B.
シリンダヘッド１の排気側の各気筒１１Ａ～Ｃ間には、図示しないヘッドボルトを挿入するための排気側ヘッドボルトボス部１５がそれぞれ間隔を隔てて設けられている。また、シリンダヘッド１の吸気側の各気筒１１Ａ～Ｃ間には、図示しないヘッドボルトを挿入するための吸気側ヘッドボルトボス部１６（図１Ａにのみ示す）がそれぞれ間隔を隔てて設けられている。
An exhaust side head bolt boss portion 15 for inserting a head bolt (not shown) is provided between the cylinders 11A to 11C on the exhaust side of the cylinder head 1 at intervals. Further, an intake side head bolt boss portion 16 (shown only in FIG. 1A) for inserting a head bolt (not shown) is provided between the respective cylinders 11A to 11C on the intake side of the cylinder head 1 with an interval therebetween. Yes.
シリンダヘッド１の吸気側には、各吸気ポート１３Ａ，Ｂの近傍をエンジンの長手方向（以下、縦方向ともいう）に沿って延びる吸気側冷却水流路２０（図１Ａにのみ示す）が設けられている。この吸気側冷却水流路２０の下流端には、ラジエータ（不図示）に冷却水を戻すための冷却水出口部（不図示）が設けられている。
On the intake side of the cylinder head 1, an intake-side cooling water flow path 20 (shown only in FIG. 1A) is provided that extends in the vicinity of the intake ports 13 </ b> A and B along the longitudinal direction of the engine (hereinafter also referred to as the vertical direction). ing. A cooling water outlet (not shown) for returning the cooling water to a radiator (not shown) is provided at the downstream end of the intake-side cooling water channel 20.
シリンダヘッド１の排気側には、排気ポート１２Ａ，Ｂの上方をエンジンの長手方向に沿って延びる排気側冷却水流路２１（図１Ｂにのみ示す）が設けられている。この排気側冷却水流路２１の下流側は、上述した冷却水出口部（不図示）に接続されている。
The exhaust side of the cylinder head 1 is provided with an exhaust side cooling water passage 21 (shown only in FIG. 1B) extending above the exhaust ports 12A and B along the longitudinal direction of the engine. The downstream side of the exhaust-side cooling water passage 21 is connected to the cooling water outlet (not shown) described above.
シリンダヘッド１の各気筒１１Ａ～Ｃ間には、エンジンの短手方向（横方向）に沿って延びる気筒間冷却水流路２３が設けられている。この気筒間冷却水流路２３は、詳細を後述するヘッドボルトボス脇冷却水流路２７Ａ，Ｂから分岐すると共に、その下流端が吸気側冷却水流路２０に合流するように形成されている。
Between the cylinders 11A to 11C of the cylinder head 1, an inter-cylinder cooling water passage 23 extending along the short direction (lateral direction) of the engine is provided. The inter-cylinder cooling water passage 23 is formed so as to branch off from the head bolt boss side cooling water passages 27A and B, the details of which will be described later, and the downstream end thereof joins the intake-side cooling water passage 20.
シリンダヘッド１の排気ポート１２Ａ，Ｂと吸気ポート１３Ａ，Ｂとの間には、エンジンの長手方向に延びる吸排気ポート間冷却水流路２４（図１Ａにのみ示す）が設けられている。この吸排気ポート間冷却水流路２４は、詳細を後述する排気ポート間冷却水流路２６の下流端から分岐して、吸気ポート１３Ａと排気ポート１２Ａとの間を流れる第１吸排気ポート間冷却水流路２４Ａ及び、吸気ポート１３Ｂと排気ポート１２Ｂとの間を流れる第２吸排気ポート間冷却水流路２４Ｂで構成されている。
Between the exhaust ports 12A and B of the cylinder head 1 and the intake ports 13A and B, an inter-intake / exhaust port cooling water passage 24 (shown only in FIG. 1A) extending in the longitudinal direction of the engine is provided. The cooling water flow path 24 between intake and exhaust ports branches from the downstream end of the cooling water flow path 26 between exhaust ports, the details of which will be described later, and flows between the intake and exhaust ports 12A and flows between the intake port 13A and the exhaust port 12A. The passage 24A and the cooling water flow path 24B between the second intake and exhaust ports flowing between the intake port 13B and the exhaust port 12B are configured.
シリンダヘッド１の各排気ポート１２Ａ，Ｂの下方には、図示しないシリンダブロックのウォータジャケットからシリンダヘッド１内に冷却水を導入するための冷却水導入部２５がエンジンの長手方向に設けられている。この冷却水導入部２５には、詳細を後述する流路絞り突起部３０Ａ，Ｂが設けられている。
Below each exhaust port 12A, B of the cylinder head 1, a cooling water introduction part 25 for introducing cooling water into the cylinder head 1 from a water jacket of a cylinder block (not shown) is provided in the longitudinal direction of the engine. . The cooling water introducing portion 25 is provided with flow passage restricting protrusions 30A and 30B, the details of which will be described later.
シリンダヘッド１の各排気ポート１２Ａ，Ｂ間には、エンジンの短手方向に延びる排気ポート間冷却水流路（第１冷却水流路）２６がそれぞれ設けられている。この排気ポート間冷却水流路２６は、冷却水導入部２５の長手方向略中央から分岐すると共に、その下流端がインジェクタボス部１４近傍の吸排気ポート間冷却水流路２４に合流するように形成されている。
Between the exhaust ports 12A and B of the cylinder head 1, an inter-exhaust-port cooling water flow path (first cooling water flow path) 26 extending in the short direction of the engine is provided. The inter-exhaust-port cooling water flow path 26 is formed so as to branch from substantially the center in the longitudinal direction of the cooling water introducing portion 25 and to have its downstream end merged with the inter-intake / exhaust-port cooling water flow path 24 in the vicinity of the injector boss portion 14. ing.
シリンダヘッド１の各排気ポート１２Ａ，Ｂと排気側ヘッドボルトボス部１５との間には、冷却水導入部２５の長手方向両端から分岐して、排気側ヘッドボルトボス部１５近傍を延びる一対のヘッドボルトボス脇冷却水流路（第２冷却水流路）２７Ａ，Ｂが設けられている。このヘッドボルトボス脇冷却水流路２７Ａ，Ｂは、気筒間冷却水流路２３の上流端に合流すると共に、その下流端が排気側冷却水流路２１に合流するように形成されている。
Between each exhaust port 12A, B of the cylinder head 1 and the exhaust side head bolt boss part 15, a pair of branches branching from both longitudinal ends of the coolant introduction part 25 and extending in the vicinity of the exhaust side head bolt boss part 15. Head bolt boss side cooling water flow paths (second cooling water flow paths) 27A, B are provided. The head bolt boss side cooling water flow paths 27 </ b> A and B are formed so as to merge with the upstream end of the inter-cylinder cooling water flow path 23, and the downstream end thereof merges with the exhaust-side cooling water flow path 21.
排気ポート間冷却水流路２６の上方には、排気ポート間冷却水流路２６から上方に向かって延びると共に、その下流端を排気側冷却水流路２１に合流させた排気側供給流路２８（図１Ｂにのみ示す）が設けられている。
Above the inter-exhaust-port cooling water flow path 26, an exhaust-side supply flow path 28 (FIG. 1B) extends upward from the inter-exhaust-port cooling water flow path 26 and has its downstream end merged with the exhaust-side cooling water flow path 21. (Only shown in Fig. 1).
流路絞り突起部３０Ａ，Ｂは、冷却水導入部２５内を排気ポート１２Ａ，Ｂ側から下方に向かって所定の突出量で突出して設けられている。流路絞り突起部３０Ａ，Ｂの突出端と冷却水導入部２５の下側内壁面との間には、所定の隙間が確保されており、流路絞り突起部３０Ａ，Ｂを適宜最適な突出量に設定することで、冷却水導入部２５からヘッドボルトボス脇冷却水流路２７Ａ，Ｂへの冷却水流量を調整できるようになっている。
The flow restricting protrusions 30A and B are provided so as to protrude in the cooling water introduction part 25 downward from the exhaust ports 12A and B by a predetermined protrusion amount. A predetermined gap is secured between the projecting ends of the flow restricting protrusions 30A and 30B and the lower inner wall surface of the cooling water introducing part 25, and the flow restricting protrusions 30A and 30B are appropriately projected appropriately. By setting the amount, the cooling water flow rate from the cooling water introduction part 25 to the head bolt boss side cooling water flow paths 27A, B can be adjusted.
以上詳述したように、第一実施形態に係る冷却構造によれば、流路絞り突起部３０Ａ，Ｂの突出量を適宜最適な値に設定して、冷却水導入部２５からヘッドボルトボス脇冷却水流路２７Ａ，Ｂへの流路を絞ることで、排気ポート間冷却水流路２６に供給される冷却水流量を効果的に確保することが可能となり、シリンダヘッド１の冷却効率を向上することができる。
As described above in detail, according to the cooling structure according to the first embodiment, the amount of protrusion of the flow path restricting protrusions 30A and 30B is appropriately set to an optimum value, By restricting the flow path to the cooling water flow paths 27A and 27B, it becomes possible to effectively secure the flow rate of the cooling water supplied to the cooling water flow path 26 between the exhaust ports, and to improve the cooling efficiency of the cylinder head 1. Can do.
［第二実施形態］
図２Ａ，図２Ｂは、第二実施形態に係るシリンダヘッドの冷却構造を説明する図である。第二実施形態の冷却構造は、第一実施形態の流路絞り突起部３０Ａ，Ｂを流路遮断突起部３１Ａ，Ｂに置き換えたものである。他の構成については第一実施形態と略同様のため、詳細な説明は省略する。 [Second Embodiment]
2A and 2B are views for explaining a cooling structure of the cylinder head according to the second embodiment. The cooling structure of the second embodiment is obtained by replacing the flow restrictor protrusions 30A, B of the first embodiment with flowpassage blocking protrusions 31A, B. Since other configurations are substantially the same as those of the first embodiment, detailed description thereof is omitted.
図２Ａ，図２Ｂは、第二実施形態に係るシリンダヘッドの冷却構造を説明する図である。第二実施形態の冷却構造は、第一実施形態の流路絞り突起部３０Ａ，Ｂを流路遮断突起部３１Ａ，Ｂに置き換えたものである。他の構成については第一実施形態と略同様のため、詳細な説明は省略する。 [Second Embodiment]
2A and 2B are views for explaining a cooling structure of the cylinder head according to the second embodiment. The cooling structure of the second embodiment is obtained by replacing the flow restrictor protrusions 30A, B of the first embodiment with flow
流路遮断突起部３１Ａ，Ｂは、冷却水導入部２５の排気ポート１２Ａ，Ｂ側の流路壁から下方に向かってシリンダヘッド１の底部まで突出して設けられている。すなわち、流路遮断突起部３１Ａ，Ｂによって、冷却水導入部２５内が、排気ポート間冷却水流路２６と分岐する長手方向中央の領域と、ヘッドボルトボス脇冷却水流路２７Ａ，Ｂと分岐する長手方向両端の領域とに完全に遮断されるように構成されている。
The flow path blocking projections 31A, B are provided so as to protrude downward from the flow path wall on the exhaust port 12A, B side of the cooling water introduction section 25 to the bottom of the cylinder head 1. That is, the flow path blocking projections 31A and 31B branch the inside of the cooling water introduction part 25 into the central region in the longitudinal direction that branches from the inter-exhaust-port cooling water flow path 26 and the head bolt boss side cooling water flow paths 27A and B. It is configured so as to be completely blocked by the regions at both ends in the longitudinal direction.
これにより、冷却水導入部２５からヘッドボルトボス脇冷却水流路２７Ａ，Ｂへの冷却水の流れを完全に遮断して、排気ポート間冷却水流路２６の冷却水流量を効果的に増加させることが可能となり、シリンダヘッド１の冷却効率を確実に向上することができる。
Thereby, the flow of the cooling water from the cooling water introduction part 25 to the head bolt boss side cooling water flow paths 27A and 27B is completely blocked, and the cooling water flow rate of the cooling water flow path 26 between the exhaust ports is effectively increased. Therefore, the cooling efficiency of the cylinder head 1 can be improved with certainty.
なお、本開示は、上述の各実施形態に限定されるものではなく、本開示の趣旨を逸脱しない範囲で、適宜変形して実施することが可能である。
Note that the present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.
例えば、図３に示すように、排気ポート間冷却水流路２６の冷却水流れ方向を逆向きに流すように構成してもよい。
For example, as shown in FIG. 3, the cooling water flow direction of the cooling water flow path 26 between the exhaust ports may be configured to flow in the opposite direction.
本出願は、2015年08月17日付で出願された日本国特許出願（特願2015-160721）に基づくものであり、その内容はここに参照として取り込まれる。
This application is based on a Japanese patent application (Japanese Patent Application No. 2015-160721) filed on August 17, 2015, the contents of which are incorporated herein by reference.
本開示のシリンダヘッドの冷却構造は、シリンダヘッドの冷却水導入部から排気ポート間流路への冷却水流量を効果的に確保することで、シリンダヘッドの冷却効率を向上することができるという点において有用である。
The cooling structure of the cylinder head according to the present disclosure can improve the cooling efficiency of the cylinder head by effectively ensuring the cooling water flow rate from the cooling water introduction part of the cylinder head to the flow path between the exhaust ports. Useful in.
１ シリンダヘッド
１１Ａ～Ｃ 気筒
１２Ａ，Ｂ 排気ポート
１３Ａ，Ｂ 吸気ポート
１４ インジェクタボス部
１５ 排気側ヘッドボルトボス部
１６ 吸気側ヘッドボルトボス部
２０ 吸気側冷却水流路
２１ 排気側冷却水流路
２３ 気筒間冷却水流路
２４ 吸排気ポート間冷却水流路
２５ 冷却水導入部
２６ 排気ポート間冷却水流路
２７Ａ，Ｂ ヘッドボルトボス脇冷却水流路
２８ 排気側供給流路
３０Ａ，Ｂ 流路絞り突起部
３１Ａ，Ｂ 流路遮断突起部 DESCRIPTION OFSYMBOLS 1 Cylinder head 11A-C Cylinder 12A, B Exhaust port 13A, B Intake port 14 Injector boss part 15 Exhaust side head bolt boss part 16 Intake side head bolt boss part 20 Intake side cooling water flow path 21 Exhaust side cooling water flow path 23 Between cylinders Cooling water flow path 24 Cooling water flow path between intake / exhaust ports 25 Cooling water introduction part 26 Cooling water flow path between exhaust ports 27A, B Head bolt boss side cooling water flow path 28 Exhaust side supply flow path 30A, B Flow path restricting projections 31A, B Channel blocking projection
１１Ａ～Ｃ 気筒
１２Ａ，Ｂ 排気ポート
１３Ａ，Ｂ 吸気ポート
１４ インジェクタボス部
１５ 排気側ヘッドボルトボス部
１６ 吸気側ヘッドボルトボス部
２０ 吸気側冷却水流路
２１ 排気側冷却水流路
２３ 気筒間冷却水流路
２４ 吸排気ポート間冷却水流路
２５ 冷却水導入部
２６ 排気ポート間冷却水流路
２７Ａ，Ｂ ヘッドボルトボス脇冷却水流路
２８ 排気側供給流路
３０Ａ，Ｂ 流路絞り突起部
３１Ａ，Ｂ 流路遮断突起部 DESCRIPTION OF
Claims (3)
- エンジンの長手方向に複数の気筒が直列に配置され、前記気筒には一対の排気ポートが前記エンジンの長手方向に沿ってそれぞれ配置され、各気筒間の排気側にはヘッドボルトボス部がそれぞれ設けられたシリンダヘッドの冷却構造であって、
前記排気ポートの下方に設けられて、シリンダブロック側から供給される冷却水をシリンダヘッド内に導入する冷却水導入部と、
前記冷却水導入部から分岐して前記一対の排気ポート間を延びる第１冷却水流路と、
前記冷却水導入部から分岐して前記ヘッドボルトボス部の近傍を流れる少なくとも一本の第２冷却水流路と、
前記冷却水導入部内に所定の突出量で突出して設けられて、前記冷却水導入部から前記第２冷却水流路への流路を絞る突起部と、を備える
シリンダヘッドの冷却構造。 A plurality of cylinders are arranged in series in the longitudinal direction of the engine, a pair of exhaust ports are arranged along the longitudinal direction of the engine, and a head bolt boss portion is provided on the exhaust side between the cylinders. A cylinder head cooling structure,
A cooling water introduction section that is provided below the exhaust port and introduces cooling water supplied from the cylinder block side into the cylinder head;
A first cooling water flow path branched from the cooling water introduction section and extending between the pair of exhaust ports;
At least one second cooling water flow path branched from the cooling water introduction part and flowing in the vicinity of the head bolt boss part;
A cooling structure for a cylinder head, comprising: a protruding portion that protrudes from the cooling water introduction portion to the second cooling water flow passage, and protrudes from the cooling water introduction portion into the cooling water introduction portion. - 前記突起部が前記冷却水導入部の上側流路壁から下方に向かって前記シリンダヘッドの底部まで延設されて、当該冷却水導入部内を前記第１冷却水流路が分岐する領域と、前記第２冷却水流路が分岐する領域とに遮断する
請求項１に記載のシリンダヘッドの冷却構造。 A region in which the protrusion extends from the upper flow path wall of the cooling water introduction part to the bottom of the cylinder head and the first cooling water flow path branches in the cooling water introduction part; The cooling structure for a cylinder head according to claim 1, wherein the cooling structure is cut off at a region where the cooling water flow path branches. - 前記冷却水導入部が、前記排気ポートの下方にエンジンの長手方向に設けられ、
前記第１冷却水流路が前記冷却水導入部の長手方向中央から分岐して設けられ、
二本の前記第２冷却水流路が前記冷却水導入部の長手方向両端からそれぞれ分岐して設けられ、
二個の前記突起部が前記冷却水導入部の長手方向中央と長手方向両端との間の二か所からそれぞれ突出して設けられた
請求項１又は２に記載のシリンダヘッドの冷却構造。 The cooling water introduction portion is provided in the longitudinal direction of the engine below the exhaust port;
The first cooling water flow path is branched from the longitudinal center of the cooling water introduction part;
Two of the second cooling water flow paths are provided to be branched from both longitudinal ends of the cooling water introduction part,
The cylinder head cooling structure according to claim 1 or 2, wherein the two protrusions are provided so as to protrude from two locations between a longitudinal center of the cooling water introduction portion and both longitudinal ends.
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| JP2015-160721 | 2015-08-17 | ||
| JP2015160721A JP2017040175A (en) | 2015-08-17 | 2015-08-17 | Cooling structure of cylinder head |
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| CN112682208B (en) * | 2020-12-31 | 2022-03-29 | 安徽江淮汽车集团股份有限公司 | Engine cylinder cover water jacket and engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19608576C1 (en) * | 1996-03-06 | 1997-06-19 | Daimler Benz Ag | Liquid cooled motor cylinder head |
| JP2001050106A (en) * | 1999-08-09 | 2001-02-23 | Daihatsu Motor Co Ltd | Cylinder head structure of internal combustion engine |
| JP2015117619A (en) * | 2013-12-18 | 2015-06-25 | 三菱自動車工業株式会社 | Cylinder head |
-
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19608576C1 (en) * | 1996-03-06 | 1997-06-19 | Daimler Benz Ag | Liquid cooled motor cylinder head |
| JP2001050106A (en) * | 1999-08-09 | 2001-02-23 | Daihatsu Motor Co Ltd | Cylinder head structure of internal combustion engine |
| JP2015117619A (en) * | 2013-12-18 | 2015-06-25 | 三菱自動車工業株式会社 | Cylinder head |
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