WO2012051791A1 - Cooling structure for engine cylinder head - Google Patents

Cooling structure for engine cylinder head Download PDF

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Publication number
WO2012051791A1
WO2012051791A1 PCT/CN2011/001581 CN2011001581W WO2012051791A1 WO 2012051791 A1 WO2012051791 A1 WO 2012051791A1 CN 2011001581 W CN2011001581 W CN 2011001581W WO 2012051791 A1 WO2012051791 A1 WO 2012051791A1
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WIPO (PCT)
Prior art keywords
cooling
cylinder head
fan
passage
intake manifold
Prior art date
Application number
PCT/CN2011/001581
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French (fr)
Chinese (zh)
Inventor
肖亨琳
Original Assignee
无锡开普动力有限公司
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Publication of WO2012051791A1 publication Critical patent/WO2012051791A1/en

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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
    • F02B75/00—Other engines
    • F02B75/06—Engines with means for equalising torque
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • 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
    • F02F1/28—Cylinder heads having cooling means for air cooling
    • 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
    • F01P1/00—Air cooling
    • F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
    • F01P2001/026—Cooling cylinder heads

Definitions

  • the object of the present invention is to overcome the above-mentioned deficiencies, thereby providing a cooling mechanism for an engine cylinder head, which can simplify the cooling air passage of the cylinder head by utilizing the structure of the relevant parts when assembling the engine, thereby achieving cost reduction and work. Increased efficiency.
  • a cylinder head cooling structure of an engine includes an engine body, a flywheel, a cooling fan, a fan cover, an intake manifold, and a cylinder head, and a flywheel of the engine body is fixed at one end of the crankshaft, A plurality of spring tails are disposed on the outer peripheral portion of the flywheel to form a cooling fan, and the fan cover is covered on the cooling fan.
  • the air intake manifold and the cooling fan are mounted on the same side of the engine body, and the intake manifold is installed.
  • the intake manifold has an integral outer casing mounted above the fan cover; the bottom of the outer casing is provided with a suction opening facing the inside of the fan cover, the intake manifold
  • the side of the fan cover is sealingly connected to the cylinder head, the fan cover is provided with a helium port at the center, and the upper part of the fan cover is provided with an air outlet; the open suction port is communicated with the air outlet of the upper part of the fan cover;
  • the first cooling passage and the second cooling passage are provided with a draft guide on the side of the first cooling passage to prevent hot air from flowing back to the cooling fan.
  • the structure of the invention is simple, compact and reasonable; the structural features of the engine components themselves are used to skillfully arrange their relative assembly positions, thereby simplifying unnecessary structures, achieving cost reduction and efficiency improvement.
  • 1 is a cross-sectional view of an engine.
  • FIG. 2 is a cooling air duct diagram of an engine.
  • the flywheel 2 of the engine body 1 of the present invention is fixed to one end of a crankshaft, and a plurality of elastic tails 2a are disposed on the outer peripheral portion of the flywheel 2 to constitute a cooling fan 3, and a fan cover 4 is covered on the cooling fan 3. .
  • the intake manifold 5 and the cooling fan 3 are mounted on the same side of the engine block 1, and the intake manifold 5 is mounted above the cooling fan 3.
  • the center of the fan cover 4 is an air inlet 4a, and the side surface 4b and the bottom portion 4c are sealingly connected to the engine body 1, and the upper portion is provided with an air outlet 4d.
  • the cooling fan 3 draws air into the fan cover 4 to cool the engine body 1 while another portion of the air is sent to the upper air outlet 4d of the fan cover 4 to cool other components.
  • the intake manifold 5 of the engine block 1 has an integral housing 5a mounted above the fan cover 4.
  • the bottom of the outer casing 5a is provided with a suction port 5b which is open to the inside of the fan cover 4, and the side portion 5c is sealingly connected to the cylinder head 6.
  • the air outlet 4d at the upper portion of the fan cover 4 delivers air to the bottom of the intake manifold casing 5a to be introduced into the cylinder head 6.
  • the outer casing 5a of the intake manifold 5 functions as a wind deflector, so that it is not necessary to redesign the structure in which the air supplied from the cooling fan 3 is introduced into the cylinder head 6, thereby reducing the cost.
  • the stem portion 13 of the injector is exposed, and the cooling air flows smoothly on both sides of the rod portion 13 of the injector, so that the injector can be effectively cooled. Improve cooling performance.
  • the present invention enables a cylinder head 6 of an engine to be simpler in structure and more complete in cooling.

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

Abstract

A cooling structure for the cylinder head of an engine comprises an engine body (1), a flywheel (2), a cooling fan (3), a fan housing (4), an intake manifold (5), a cylinder head (6). The flywheel (2) is fixedly attached to one end of a crankshaft and a plurality of fins (2a) arranged upon the outer periphery of the flywheel (2) constitute the cooling fan (3). The fan housing (4) is arranged to cover the cooling fan (3). The intake manifold (5) and the cooling fan (3) are arranged on the same side of the engine body (1), said intake manifold (5) being arranged above the cooling fan (3). An integral shell (5a) is arranged on the intake manifold (5) and above the fan housing (4), and an air intake port (5b) is arranged at the base of the integral shell (5a) and opens to the interior of the fan housing (4). One side (5c) of the intake manifold (5) is connected to the cylinder head (6). An air intake port (4a) is centrally arranged on the fan housing (4) and an air outlet (4d) is arranged at the top of the fan housing (4). The open air intake port (5b) is connected to the air outlet (4d) at the top of the fan housing (4). A first cooling passage (7) and a second cooling passage (8) are arranged inside the cylinder head (6), and an air guide (9) is mounted at one side of the first cooling passage (7). The present cooling structure for an engine cylinder head utilizes the structural characteristics of engine parts themselves, arranging their relative assembly positions and simplifying unnecessary structures so as to achieve cost reductions and greater efficiency.

Description

发动机的气缸盖冷却结构 技术领域  Cylinder head cooling structure of engine
[0001 ] 本发明涉及一种发动机的气缸盖冷却结构， 具体地说是属于动力装置技术领 域。 背景技术  [0001] The present invention relates to a cylinder head cooling structure for an engine, and more particularly to the field of power plant technology. Background technique
[0002] 在已有发动机气缸盖技术中，气缸盖是设置冷却风扇和通风道等之后再连接设置 在冷却风扇一侧的连通孔，把冷却风引入到气缸盖内部的结构。所以其结构复杂，冷却通风 道也复杂，冷却风在气缸盖内部的途中阻碍就比较多，降低了流速，从而降低了冷却效率。 发明内容  [0002] In the existing engine cylinder head technology, the cylinder head is a structure in which a cooling fan, a ventilating passage, and the like are provided, and then a communication hole provided on one side of the cooling fan is connected to introduce the cooling air into the inside of the cylinder head. Therefore, the structure is complicated, the cooling air passage is also complicated, and the cooling air is hindered on the way inside the cylinder head, thereby reducing the flow rate, thereby reducing the cooling efficiency. Summary of the invention
[0003] 本发明的目的在于克服上述不足之处，从而提供一种发动机气缸盖的冷却机构， 利用与发动机装配时的相关零件的结构可以简化气缸盖的冷却通风道，实现成本的降低和 工作效率的提高。  [0003] The object of the present invention is to overcome the above-mentioned deficiencies, thereby providing a cooling mechanism for an engine cylinder head, which can simplify the cooling air passage of the cylinder head by utilizing the structure of the relevant parts when assembling the engine, thereby achieving cost reduction and work. Increased efficiency.
C0004] 按照本发明提供的技术方案，发动机的气缸盖冷却结构包括发动机机体、飞轮、冷 却风扇、风扇罩、进气歧管、气缸盖，所述发动机机体的飞轮固定在曲轴的一端，所述飞轮的 外侧外周部上设置多个弹尾构成冷却风扇，所述风扇罩覆盖在冷却风扇上，特征是：所述进 气歧管与冷却风扇安装在发动机体的同一侧，进气歧管安装在冷却风扇的上方,所述进气 歧管上有一个整体式的外壳，安装在风扇罩的上方；所述外壳底部设置有面对风扇罩内部 敞开的吸入口，所述进气歧管的侧部与气缸盖密封连接，所述风扇罩中央设有迸气口，所述 风扇罩上部设有出气口；所述敞开的吸入口与风扇罩上部的迸气口相通；所述气缸 II内部 设有第一冷却通道和第二冷却通道，所述第一冷却通道侧面安装有一引风板导向，以防止 热空气再回流到冷却风扇的现象。  According to the technical solution provided by the present invention, a cylinder head cooling structure of an engine includes an engine body, a flywheel, a cooling fan, a fan cover, an intake manifold, and a cylinder head, and a flywheel of the engine body is fixed at one end of the crankshaft, A plurality of spring tails are disposed on the outer peripheral portion of the flywheel to form a cooling fan, and the fan cover is covered on the cooling fan. The air intake manifold and the cooling fan are mounted on the same side of the engine body, and the intake manifold is installed. Above the cooling fan, the intake manifold has an integral outer casing mounted above the fan cover; the bottom of the outer casing is provided with a suction opening facing the inside of the fan cover, the intake manifold The side of the fan cover is sealingly connected to the cylinder head, the fan cover is provided with a helium port at the center, and the upper part of the fan cover is provided with an air outlet; the open suction port is communicated with the air outlet of the upper part of the fan cover; The first cooling passage and the second cooling passage are provided with a draft guide on the side of the first cooling passage to prevent hot air from flowing back to the cooling fan.
[0005] 所述气缸盖上设有进气道，进气道两侧设有第一连通孔及第二连通孔第一连通孔 及第二连通孔分别与进气歧管外壳所引导的冷却风通道相通。所述进气道的外壁有一定的 角度，可以引导来自进气歧管外壳的空气。  [0005] The cylinder head is provided with an intake passage, and the first communication hole and the second communication hole are provided on both sides of the inlet passage, and the first communication hole and the second communication hole are respectively cooled by the intake manifold housing. The wind passages are connected. The outer wall of the intake passage is angled to direct air from the intake manifold housing.
[0006] 所述气缸盖的第一冷却通道中的进气门的气门杆部和排气门的排气门杆部的各 个支撑部之间所形成的冷却风通道，其冷却风通道顶部是为向上方突起的结构。  [0006] a cooling air passage formed between a valve stem portion of the intake valve and a support portion of the exhaust valve stem portion of the exhaust valve in the first cooling passage of the cylinder head, the top of the cooling air passage is It is a structure that protrudes upward.
[0007] 本发明与已有技术相比具有以下优点： The present invention has the following advantages over the prior art:
本发明结构简单、紧凑，合理；利用发动机零部件本身的结构特点，巧妙的安排其相对 的装配位置,从而可以简化不必要的结构，实现成本的降低和效率的提高。 附图说明  The structure of the invention is simple, compact and reasonable; the structural features of the engine components themselves are used to skillfully arrange their relative assembly positions, thereby simplifying unnecessary structures, achieving cost reduction and efficiency improvement. DRAWINGS
[0008] 图 1为发动机的横剖图。  1 is a cross-sectional view of an engine.
[0009] 图 2为发动机的冷却风道图。 2 is a cooling air duct diagram of an engine.
[0010] 图 3为发动机进气歧管的底图。 [0010] FIG. 3 is a bottom view of an engine intake manifold.
[0011 ] 图 4为发动机进气歧管的断面图。 [0012] 图 5为发动机喷油器杆部的剖面图。 具体实施方式 4 is a cross-sectional view of an engine intake manifold. [0012] FIG. 5 is a cross-sectional view of an engine injector stem. detailed description
[0013] 下面本发明将结合附图中的实施例作进一步描述：  [0013] The invention will be further described below in conjunction with the embodiments of the drawings:
图 1〜图 5所示，包括 1-发动机体、 2-飞轮、 2a-弹尾、 3-冷却风扇、 4-风扇罩、4a-进 气口、4b-侧面、 4c-底部、 4d-出气口、5-进气歧管、 5a-外壳、 5b-吸入口、5c-侧部、 6-气缸 盖、 6a-进气道、6b-第一连通孔、 6c- .第二连通孔、 7-第一冷却通道、8-第二冷却通道、9-引 风板、 10-进气门、 10a-进气门杆部、 11-排气门、 11a-排气门杆部、 12-冷却风通道、13-喷 油器杆部。  Figure 1 to Figure 5, including 1-engine body, 2-flywheel, 2a-elastic tail, 3-cooling fan, 4-fan cover, 4a-air inlet, 4b-side, 4c-bottom, 4d-out Air port, 5-intake manifold, 5a-case, 5b-suction port, 5c-side, 6-cylinder head, 6a-intake port, 6b-first communication hole, 6c-. second communication hole, 7 - first cooling passage, 8-second cooling passage, 9-air deflector, 10-intake valve, 10a-intake valve stem, 11-exhaust valve, 11a-exhaust valve stem, 12-cooling Wind passage, 13-injector stem.
[0014] 本发明发动机体 1的飞轮 2被固定在曲轴的一端上，该飞轮 2的外侧外周部上设 置多个弹尾 2a，构成冷却风扇 3,并有风扇罩 4覆盖在冷却风扇 3上。 所述进气歧管 5与冷 却风扇 3安装在发动机体 1的同一侧，进气歧管 5安装在冷却风扇 3的上方。所述风扇罩 4 中央为进气口 4a,侧面 4b和底部 4c与发动机体 1密封连接，上部设有出气口 4d。 冷却风 扇 3把空气吸入到风扇罩 4内，对发动机体 1进行冷却的同时另外一部分的空气被传送到 风扇罩 4的上部出气口 4d处，对其它零部件进冷却。  [0014] The flywheel 2 of the engine body 1 of the present invention is fixed to one end of a crankshaft, and a plurality of elastic tails 2a are disposed on the outer peripheral portion of the flywheel 2 to constitute a cooling fan 3, and a fan cover 4 is covered on the cooling fan 3. . The intake manifold 5 and the cooling fan 3 are mounted on the same side of the engine block 1, and the intake manifold 5 is mounted above the cooling fan 3. The center of the fan cover 4 is an air inlet 4a, and the side surface 4b and the bottom portion 4c are sealingly connected to the engine body 1, and the upper portion is provided with an air outlet 4d. The cooling fan 3 draws air into the fan cover 4 to cool the engine body 1 while another portion of the air is sent to the upper air outlet 4d of the fan cover 4 to cool other components.
[0015] 本发动机体 1的进气歧管 5上有一个整体式的外壳 5a,安装在风扇罩 4的上方。 该外壳 5a的底部设置了面对风扇罩 4内部敞开的吸入口 5b，侧部 5c与气缸盖 6密封连接。 风扇罩 4上部的出气口 4d正好把空气输送到进气歧管外壳 5a的底部，从而引入到气缸盖 6内部。 这样进气歧管 5的外壳 5a就起到了导风板的作用，所以没有必要重新设计把冷却 风扇 3输送的空气引入气缸盖 6的结构，降低了成本。  [0015] The intake manifold 5 of the engine block 1 has an integral housing 5a mounted above the fan cover 4. The bottom of the outer casing 5a is provided with a suction port 5b which is open to the inside of the fan cover 4, and the side portion 5c is sealingly connected to the cylinder head 6. The air outlet 4d at the upper portion of the fan cover 4 delivers air to the bottom of the intake manifold casing 5a to be introduced into the cylinder head 6. Thus, the outer casing 5a of the intake manifold 5 functions as a wind deflector, so that it is not necessary to redesign the structure in which the air supplied from the cooling fan 3 is introduced into the cylinder head 6, thereby reducing the cost.
[0016] 本发动机体 1的气缸盖冷却风扇侧面设有进气道 6a，进气道 6a的两侧设有第一 连通孔 6b和第二连 孔 6c，并与进气歧管外壳 5a所引导的冷却风通道相通。 所述气缸盖 6内部设有第一冷却通道 7和第二冷却通道 8，所述第一冷却通道 7侧面安装有一引风板 9 导向，以防止热空气再回流到冷却风扇 3的现象。 所述进气道 6a的外壁有一定的角度，可 以引导来自进气歧管外壳 5a的空气，防止第一冷却通道 7内冷却气缸盖 6之后的热空气流 入到第二冷却通道 8内。  [0016] The side of the cylinder head cooling fan of the engine block 1 is provided with an intake passage 6a, and the first communication hole 6b and the second connection hole 6c are provided on both sides of the intake passage 6a, and are coupled to the intake manifold housing 5a. The guided cooling air passages communicate. The cylinder head 6 is internally provided with a first cooling passage 7 and a second cooling passage 8, and a side of the first cooling passage 7 is provided with a guide plate 9 to prevent hot air from flowing back to the cooling fan 3. The outer wall of the intake passage 6a is angled to guide the air from the intake manifold casing 5a to prevent the hot air after cooling the cylinder head 6 in the first cooling passage 7 from flowing into the second cooling passage 8.
[0017] 所述第一冷却通道 7中进气门 10的气门杆部 10a和排气门 11的排气门杆部 11a 的各个支撑部之间所形成的冷却风通道 12,其冷却风通道 12顶部是为向上方突起的结构。 因此，可以扩大冷却风通道 12的横截面积，使气缸盖 6的冷却效果更好。  [0017] The cooling air passage 12 formed between the valve stem portion 10a of the intake valve 10 and the respective support portions of the exhaust valve stem portion 11a of the exhaust valve 11 in the first cooling passage 7 has a cooling air passage The top of the 12 is a structure that protrudes upward. Therefore, the cross-sectional area of the cooling air passage 12 can be enlarged to make the cooling effect of the cylinder head 6 better.
[0018] 所述的第一冷却通道 7中，露出喷油器的杆部 13，冷却风在喷油器的杆部 13两侧 顺畅的流动,所以可有效的冷却喷油器。 提高冷却性能。 [0018] In the first cooling passage 7, the stem portion 13 of the injector is exposed, and the cooling air flows smoothly on both sides of the rod portion 13 of the injector, so that the injector can be effectively cooled. Improve cooling performance.
[0019] 总体而言,本发明能使一种发动机的气缸盖 6结构更加简单，冷却更充分。  [0019] In general, the present invention enables a cylinder head 6 of an engine to be simpler in structure and more complete in cooling.

Claims

权 利 要 求 Rights request
1. 一种发动机的气缸盖冷却结构，包括发动机机体（1 )、飞轮（2 )、冷却风扇（3)、风扇 罩（ 4 )、进气歧管（ 5 )、气缸盖（ 6 )，所述发动机机体（ 1 )的飞轮（ 2 )固定在曲轴的一端，所述 飞轮（ 2 )的外侧外周部上设置多个弹尾〔2a)构成冷却风扇（ 3 )，所述风扇罩（4)覆盖在冷却 风扇（ 3 )上，其特征是：所述进气歧管（ 5 )与冷却风扇（ 3 )安装在发动机体（ 1 )的同一侧,进 气歧管（ 5 )安装在冷却风扇（ 3 )的上方，所述进气歧管（ 5 )上有一个整体式的外壳（ 5a )，安 装在风扇罩（4)的上方；所述外壳 ( 5a)底部设置有面对风扇罩（4)内部敞开的吸入口（5b)， 所述进气歧管（5 )的侧部（5c )与气缸盖（6 )连接，所述风扇罩（4)中央设有进气口（4a) , 所述风扇罩（4)上部设有出气口（ 4d)；所述敞开的吸入口（ 5b)与风扇罩（4)上部的进气口 (4a)相通；所述气缸盖（6)内部设有第一冷却通道（7 )和第二冷却通道（8) ,所述第一冷却 通道 ( 7)侧面安装有引风板（9 )导向。 1. A cylinder head cooling structure for an engine, comprising an engine body (1), a flywheel (2), a cooling fan (3), a fan cover (4), an intake manifold (5), and a cylinder head (6). The flywheel (2) of the engine block (1) is fixed to one end of the crankshaft, and a plurality of projectiles (2a) are disposed on the outer peripheral portion of the flywheel (2) to constitute a cooling fan (3), and the fan cover (4) Covering the cooling fan (3), the intake manifold (5) and the cooling fan (3) are mounted on the same side of the engine body (1), and the intake manifold (5) is mounted on the cooling fan. Above (3), the intake manifold (5) has an integral outer casing (5a) mounted above the fan cover (4); the bottom of the outer casing (5a) is provided with a facing fan cover ( 4) an open suction port (5b), the side portion (5c) of the intake manifold (5) is connected to the cylinder head (6), and the air inlet (4a) is provided in the center of the fan cover (4) The upper portion of the fan cover (4) is provided with an air outlet (4d); the open suction port (5b) communicates with the air inlet (4a) of the upper portion of the fan cover (4); A cover (6) is provided with an internal (7) and a second cooling passage (8) a first cooling passage, said first cooling passage (7) is attached to the wind side plate (9) guide.
2.根据权利要求 1所述的发动机的气缸盖冷却结构，其特征在于所述气缸盖（6 )上设 有进气道（6a) ,进气道（6a〉两侧设有第一连通孔（6b )及第二连通孔（6c ),第一连通孔（6b) 及第二连通孔（6c )分别与进气歧管外壳（5a)所引导的冷却风通道相通。  2. The cylinder head cooling structure of an engine according to claim 1, wherein the cylinder head (6) is provided with an intake passage (6a), and the intake passage (6a> is provided with a first communication hole on both sides thereof) (6b) and the second communication hole (6c), the first communication hole (6b) and the second communication hole (6c) are respectively communicated with the cooling air passage guided by the intake manifold housing (5a).
3.根据权利要求 1所述的发动机的气缸盖冷却结构，其特征在于所述进气道（6a)的外 壁设有一定的角度。  A cylinder head cooling structure for an engine according to claim 1, wherein an outer wall of said intake passage (6a) is provided with a certain angle.
4. 根据权利要求 1所述的发动机的气缸盖冷却结构，其特征在干所述第一冷却通道 ( 7 )中的进气门（ 10 )的气门杆部（ 1 Oa)和排气门（ 11 )的排气门杆部（11a)的各个支撑部之 间形成冷却风通道（ 12)，其冷却风通道（ 12 )顶部为向上方突起。  4. The cylinder head cooling structure of an engine according to claim 1, characterized by drying a valve stem portion (1 Oa) and an exhaust valve of the intake valve (10) in the first cooling passage (7) A cooling air passage (12) is formed between the respective support portions of the exhaust valve stem portion (11a), and the top of the cooling air passage (12) protrudes upward.
PCT/CN2011/001581 2010-10-19 2011-09-19 Cooling structure for engine cylinder head WO2012051791A1 (en)

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