TWI454616B - Engine heat dissipation of cylinder head - Google Patents

Description

Heat dissipation structure of engine cylinder head

The invention relates to a heat dissipation structure of an engine cylinder head, in particular to a cylinder head structure which can improve the cooling effect of the engine to achieve the heat dissipation effect of the entire cylinder head.

According to the general vehicle, such as locomotives, all-terrain vehicles, etc., after mixing the fresh air and fuel introduced into the outside into oil and gas, then the oil and gas input engine is ignited to generate power, and the piston is pushed to reciprocate. The crankshaft drives the chain or belt shifting mechanism to drive to achieve the purpose of travel.

For the high-temperature heat dissipation structure generated when the vehicle engine is running, as shown in FIG. 1, the engine power system 1 includes at least a crankcase 11 and a cylinder body 12, and the cylinder body 12 is provided with a cylinder head 13 at the cylinder. The body 12 and the cylinder head 13 are provided with a plurality of fins to increase the heat dissipation area. When the vehicle is traveling, the cooling air enters from the front of the vehicle to the rear of the vehicle to blow the engine power system 1 to perform the cooling and cooling operation, so that the engine power system 1 It can be operated at a normal operating temperature; however, as is known, the hottest part of the engine power system 1 is at the cylinder head 13, and the exhaust port 131 and the spark plug seat 132 at the cylinder head 13 are again the cylinder head 13 At the highest temperature, in order to improve the service life of the engine power system 1, the industry is actively focusing on the heat dissipation of the exhaust 埠131 and the spark plug 132.

Referring to FIG. 2 (the large arrow in the figure indicates the direction of the front end), the operator has an air passage 2 on the cylinder head 13, and the air passage 2 has a transverse passage 21 and a longitudinal passage 22, and the transverse passage 21 is located at the machine. Piece storage compartment 134 and exhaust port 13 1. Between the intake ports 133, the longitudinal passages 22 are located between the exhaust ports 131 and the intake ports 133, and one end thereof is connected to the transverse passage 21, the other end is connected to the Mars plug 132, and the transverse passage 21 is A plurality of flow guiding members 23 are provided at the junction with the longitudinal passages 22, whereby the cooling air (the small arrow in the figure) can be introduced into the transverse passage 21 from the side of the exhaust manifold 131 to one of the highest temperatures of the engine power system 1. The exhaust enthalpy 131 side first performs the action of cooling and cooling, and then the cooling air flows to the spark plug 12 by the flow guiding member 23 to cool and cool the spark plug 132; the above heat dissipation method can be exhausted The crucible 131 and the Mars plug 132 perform the function of cooling and cooling, but the flow guiding effect of the flow guiding member 23 is not good, so the effect of cooling and cooling the cylinder head 13 is limited. Therefore, how to improve the flow guiding effect of the flow guiding member 23 provided in the cylinder head 13 can ensure that the external cooling air can be guided to the spark plug 12 for cooling and cooling work, thereby achieving the purpose of cooling the entire engine power system 1. It has become an urgent issue for the vehicle industry.

In view of the lack of good guiding effect of the flow guiding member provided in the heat dissipating structure of the conventional engine cylinder head, the main object of the present invention is to provide a heat dissipating structure of the engine cylinder head, which is cooled when the vehicle is in a running state. The wind can be exhausted from the exhaust passage through the longitudinal passage to the intake side to guide the external cooling air into the transverse passage to cool and dissipate the spark plug, thereby improving the cooling and cooling effect of the engine to achieve the overall cylinder head. The heat dissipation effect prevents the deformation of the machine parts caused by uneven heat dissipation temperature, thereby improving Engine cooling efficiency and service life.

The present invention is the main technical means adopted for the above purposes: the engine includes at least one crankcase, a cylinder disposed on the crankcase, and a cylinder head disposed on the cylinder, the cylinder and the cylinder head extending a plurality of heat dissipation a gas cylinder is arranged on the left side of the cylinder head, and a spark plug is arranged on the lower side of the cylinder head, and an exhaust port is arranged on the right side of the cylinder head, and the upper side of the cylinder head is opened through the right side to the left side. a longitudinal channel on the square side; the cylinder head is provided with a lateral passage from the lower side to the upper side, and the transverse passage is in communication with the longitudinal passage, and the main purpose is that the longitudinal passage is located at the upper side of the cylinder head toward the transverse passage The air guiding convex portion is convexly provided; the present invention is another main technical means adopted for the above purpose: the engine includes at least a crankcase, a cylinder disposed on the crankcase, and a cylinder head disposed on the cylinder. The cylinder and the cylinder head are provided with a plurality of fins; an air intake port is arranged on the left side of the cylinder head, and a spark plug is arranged on the lower side of the cylinder head, and an exhaust port is arranged on the right side of the cylinder head, and the cylinder head is provided on the cylinder head Square side opening a longitudinal passage from the right side to the left side; the cylinder head is provided with a transverse passage from the lower side to the upper side, and the transverse passage is connected to the longitudinal passage, and the main purpose is that the longitudinal passage is located at the cylinder head An air guiding convex portion is convexly disposed on a right side of the right side, and a wind blocking convex portion is protruded from an upper side of the longitudinal direction of the longitudinal direction of the cylinder head; the present invention is a secondary technical means adopted for the above purpose: The windward convex portion is protruded from the left side of the longitudinal direction of the cylinder head toward the upper side of the cylinder head; the present invention is another secondary technical means adopted for the above purpose: the longitudinal passage is located at the upper side of the cylinder head toward the cylinder head The intake enthalpy is provided with a throttle rib.

In order to make it easier for your examiner to understand the structure of the present invention and the efficiencies that can be achieved, the following diagrams are followed: First, please refer to Figures 3 and 4 (the large arrow in the figure indicates the direction of the front) The heat dissipation structure of the engine cylinder head of the invention includes at least a crankcase 3, a cylinder 4 disposed on the crankcase 3, and a cylinder head 5 disposed on the cylinder 4, the cylinder 4 and the cylinder head 5 extending A plurality of fins 41 and 51 are provided; see FIG. 4 (the large arrow in the figure indicates the direction of the head), and the upper, lower, left, and right sides described in the following description are as shown in the upper part of FIG. The upper side 5d, the lower side is the lower side 5b, the left side is the left side 5a, and the right side is the right side 5c, which is described first; the left side 5a of the cylinder head 5 is provided with an intake port 52, which is 5 The lower side 5b is provided with a spark plug 53, and the right side 5c of the cylinder head 5 is provided with an exhaust port 54 for arranging the exhaust port 54 of the right side 5c of the cylinder head 5 toward the front of the vehicle (illustrated The direction indicated by the arrow in the middle arrow), and the intake port 52 is disposed toward the rear of the vehicle (in the direction of the large arrow in the figure), the cylinder head 5 The arrangement does not limit the embodiment of the cylinder head 5 of the present invention, and is again stated; the upper side 5d of the cylinder head 5 is provided with a longitudinal passage 7 extending through the right side 5c to the left side 5a, which is along the longitudinal passage 7 The exhaust port 54 penetrates into the longitudinal passage 7 extending in the direction of the intake port 52, that is, the intake port 52 and the exhaust port 53 are located between the spark plug seat 53 and the longitudinal passage 7, thereby when the vehicle is in a running state. The external cooling air may be discharged from the exhaust port 54 through the longitudinal passage 7 to the intake port 52 side; and the cylinder head 5 is provided with a cross-section from the lower side 5b to the upper side 5d. The passage 6, the transverse passage 6 is located between the exhaust port 54 and the intake port 52, and the transverse passage 6 is provided with an opening 61 at the lower side 5b of the cylinder head 5, that is, the opening 61 of the transverse passage 6 is located At the Mars plug seat 53, the transverse channel 6 is in communication with the longitudinal channel 7; the upper side 5d of the cylinder head 5 is adjacent to the two screw-hole center points 7c, 7d of the longitudinal channel 7, the two screw-hole center points 7c, 7d connection A2, and the lower side 5b of the cylinder head 5 is adjacent to the intake valve seat center point 7a and the exhaust valve center point 7b of the longitudinal passage 7, the intake valve seat center point 7a and the exhaust of the vertical passage 7 A line A1 of the two center points of the valve center point 7b, the imaginary center line A of the vertical channel 7 is defined by the line A1, A2; the horizontal channel 6 is provided with at least one wind guiding rib 8, the guiding wind The rib 8 is adjacent to the intake port 52 on the left side 5a of the cylinder head 5, and the upper portion 81 of the air guiding rib 8 extends toward the upper side 5d of the cylinder head 5, and the lower portion 82 of the air guiding rib 8 faces the cylinder head 5. The Mars plug 53 on the lower side 5b extends.

An air guiding convex portion 71 is protruded from the vertical passage 7 on the upper side 5d of the cylinder head 5 toward the horizontal passage 6, and more specifically, the windward surface 5d1 on the upper side 5d of the cylinder head 5, and the cylinder head At the intersection of the leeward surface 5d2 of the upper side 5d of the fifth portion, the air guiding convex portion 71 is convexly disposed from the upper side 5d of the cylinder head 5 in the longitudinal passage 7 toward the horizontal passage 6; wherein the convex apex 711 of the wind guiding convex portion 71 An imaginary centerline A that is closer to the longitudinal passage 7; thereby, when the outside cooling wind (indicated by a small arrow in the drawing) enters the cylinder head 5 from the longitudinal passage 7, the cooling air can be guided by the air guiding convex portion After the guiding of the guide 71, it is guided by the air guiding ribs 8 provided on the horizontal passage 6, whereby the cooling air entering from the vertical passage 7 cools and cools the exhaust port 54, and is guided to The cross channel 6 internally cools the Mars plug 53 and discharges it through the opening 61 of the cross channel 6, thereby reducing the temperature of the Mars plug 53 at the hottest point of the engine E, thereby improving the cooling efficiency of the engine E and Service life.

Please also refer to FIG. 5 (the large arrow in the figure indicates the direction of the front head), wherein the convex apex 711 of the wind guiding convex portion 71 passes through the imaginary center line A of the vertical passage 7 , thereby making the wind guiding convex The convex apex 711 of the portion 71 is closer to the upper portion 81 of the air guiding rib 8, so that a larger amount of the cooling air entering the cylinder head 5 from the longitudinal passage 7 is guided into the horizontal passage 6; thereby cooling the outside The wind (indicated by a small arrow in the figure) enters the cylinder head 5 from the longitudinal passage 7, and the cooling wind can be guided by the wind guiding convex portion 71, and then by the wind guiding rib 8 provided in the transverse passage 6. After being guided, the cooling air entering by the longitudinal passage 7 cools and cools the exhaust dam 54 and is guided into the transverse passage 6 to cool and cool the spark plug 53 and then discharged from the opening 61 of the transverse passage 6. In order to reduce the temperature of the spark plug 53, which is the hottest part of the engine E, to improve the cooling efficiency and service life of the engine E.

When the present invention is implemented, please refer to FIG. 6 (the large arrow in the figure indicates the direction of the front end), and the choke convex portion 72 is convexly disposed on the left side 5a of the cylinder head 5 toward the upper side 5d. More specifically, the windward convex portion 72 is protruded from the side of the intake port 52 of the cylinder head 5 toward the upper side 5d of the cylinder head 5 in the longitudinal passage 7; wherein the convex apex 721 of the choke convex portion 72 is The upper portion 81 of the air guiding rib 8 is extended. By the arrangement of the air blocking convex portion 72 and the air guiding convex portion 71, the channel diameter of the rear end of the vertical channel 7 can be effectively reduced; thereby, when the external cooling air is used (Fig. Shown by small arrows) enters the cylinder head 5 by the longitudinal passage 7, which can be guided by The guide of the wind convex portion 71 and the passage of the rear end of the vertical passage 7 are reduced by the choke convex portion 72, whereby the cooling air entering from the vertical passage 7 cools and cools the exhaust port 54 The cooling air can be guided into the transverse passage 6 by a large amount of the guide ribs 8 provided on the transverse passage 6, and then the heat dissipation and cooling of the spark plug 53 can be performed, and then discharged from the opening 61 of the transverse passage 6. In order to reduce the temperature of the spark plug 53, which is the hottest part of the engine E, to improve the cooling efficiency and service life of the engine E.

As shown in FIG. 7 (the large arrow in the figure indicates the direction of the front head), in the implementation of the present invention, the air guiding convex portion 73 is convexly disposed on the right side 5c of the longitudinal direction of the cylinder head 5 toward the wind guiding rib 8. And a choke convex portion 72 is protruded from the longitudinal side 7 on the left side 5a of the cylinder head 5 toward the upper side 5d; more specifically, the exhaust passage 54 of the longitudinal passage 7 in the cylinder head 5 An air guiding convex portion 73 is protruded from the side of the wind guiding rib 8; wherein the convex apex 731 of the air guiding convex portion 73 is extended toward the horizontal passage 6 by the arrangement of the air guiding convex portion 73, thereby The cooling air (indicated by a small arrow in the drawing) enters the cylinder head 5 from the longitudinal passage 7, and after the cooling air cools and cools the exhaust port 54, the cooling air can be largely guided by the wind guiding convex portion 73. And the guiding of the wind guiding ribs 8 provided on the horizontal passage 6, and being introduced into the horizontal passage 6 in a large amount, thereby cooling the Mars plug 53 and discharging it from the opening 61 of the horizontal passage 6, thereby Reduce the temperature of the spark plug 53 in the hottest part of the engine E, thereby improving the cooling efficiency and service life of the engine E; as shown in Fig. 8, the vertical passage 7 is located in the steam 5d facing the upper side of the channel cross-head 5 is provided with air guide protrusion 6 protruding portion 71, and located within the cylinder head 5 of the vertical channel 7 The windward convex portion 72 is convexly disposed on the upper side 5a of the left side 5a, and the windward convex portion 73 is convexly disposed on the right side 5c of the longitudinal direction of the cylinder head 5 toward the wind guiding rib 8. The air guiding convex portion 71, the wind blocking convex portion 72, and the air guiding convex portion 73 are disposed, whereby the external cooling air (indicated by small arrows in the drawing) enters the cylinder head 5 from the longitudinal passage 7, and the cooling is performed. After the air is cooled and cooled by the exhaust damper 54 , the cooling air can be largely guided by the wind guiding convex portion 71 , the wind blocking convex portion 72 , the slanting convex portion 73 , and the wind guide provided on the horizontal passage 6 . The ribs 8 are guided and are introduced into the transverse passages 6 in a large amount, thereby cooling the Mars plugs 53 and discharging them through the openings 61 of the transverse passages 6, thereby reducing the hottest plugs of the engine E. The temperature, in turn, improves the cooling efficiency and service life of the engine E.

Referring to FIG. 9 (the large arrow in the figure indicates the direction of the front end), in the implementation of the present invention, the air guiding convex portion 71 is convexly disposed on the upper side 5d of the longitudinal direction of the cylinder head 5 toward the horizontal passage 6. And a choke convex portion 72 is protruded from the longitudinal side of the cylinder head 5 toward the upper side 5d of the cylinder head 5, and the inner end of the longitudinal passage 7 is located at the upper side 5d of the cylinder head 5 toward the cylinder head 5. The left side 5a is provided with a throttle rib 74, more specifically, in the longitudinal passage 7 at the leeward surface 5d2 of the upper side 5d of the cylinder head 5, extending toward the intake port 52 of the cylinder head 5. There is a throttle rib 74, and the amount of exhaust air of the longitudinal passage 7 is controlled by the arrangement of the throttle rib 74; thereby, when the external cooling wind (indicated by a small arrow in the figure) enters the cylinder head 5 from the longitudinal passage 7, The amount of exhaust air of the vertical passage 7 is controlled by the throttle rib 74, whereby the cooling air is a majority of the air guiding convex portion 71, the wind blocking convex portion 72, and the air guiding rib provided on the horizontal passage 6. 8 guide, after the exhaust 埠 54 is cooled and cooled, and guided The cross section 6 is used to cool and cool the Mars plug 53 and then discharged from the opening 61 of the cross channel 6, thereby reducing the temperature of the spark plug 53 in the hottest part of the engine E, thereby improving the cooling efficiency of the engine E. And the service life; as shown in FIG. 10, the air passage convex portion 71 is convexly disposed on the upper side 5d of the longitudinal direction of the cylinder head 5 toward the horizontal passage 6, and the vertical passage 7 is located at the left side of the cylinder head 5. a wind blocking convex portion 72 is convexly protruded toward the upper side 5d of the square side 5a, and an air guiding convex portion 73 is convexly disposed on the right side 5c of the longitudinal direction of the cylinder head 5 toward the wind guiding rib 8, and the longitudinal direction The inner end of the passage 7 is located on the upper side 5d of the cylinder head 5 and faces the left side 5a of the cylinder head 5 with a throttle rib 74. By the arrangement of the throttle rib 74, the amount of exhaust air of the longitudinal passage 7 is controlled; The outside cooling air (indicated by a small arrow in the drawing) enters the cylinder head 5 from the longitudinal passage 7, and the throttle rib 74 regulates the exhaust air volume of the longitudinal passage 7, whereby the cooling air is mostly The air guiding convex portion 71, the wind blocking convex portion 72, the air guiding convex portion 73, and the air guiding ribs 8 provided on the horizontal passage 6 guide the exhaust air dam 54 to be cooled and cooled, and then guided. Leading into the transverse channel 6 to cool and cool the Mars plug 53 and then discharging it through the opening 61 of the transverse channel 6, thereby reducing the temperature of the spark plug 53 in the hottest part of the engine E, thereby improving the cooling of the engine E. Efficiency and service life.

The effect of the present invention is that by providing the transverse passage 6 and the longitudinal passage 7 on the cylinder head 5, and by providing the air guiding convex portion 71 in the longitudinal passage 7, the external cooling air can be caused to enter the cylinder head 5 from the longitudinal passage 7 Afterwards, it is guided into the transverse passage 6 to cool and cool the Mars plug 53 and then discharged through the opening 61 of the transverse passage 6, thereby reducing the temperature of the Mars plug 53 at the hottest point of the engine E. To upgrade the engine E cooling efficiency and service life.

A further effect of the present invention is that by providing the choke convex portion 72 in the longitudinal passage 7, by the action of the air guiding convex portion 71 and the wind blocking convex portion 72, the external cooling air can be further entered into the cylinder from the longitudinal passage 7. After the inside of the head 5, it is guided into the transverse passage 6 to cool and cool the Mars plug 53 and then discharged from the opening 61 of the transverse passage 6, thereby reducing the temperature of the Mars plug 53 at the hottest point of the engine E. In order to improve the cooling efficiency and service life of the engine E.

Another effect of the present invention is that, by providing the air guiding convex portion 73 in the longitudinal passage 7, the external cooling air can be introduced into the cylinder head 5 from the longitudinal passage 7 by the drainage action of the air guiding convex portion 73. It is guided into the transverse passage 6 to cool and cool the Mars plug 53 and then discharged through the opening 61 of the transverse passage 6, thereby reducing the temperature of the Mars plug 53 at the hottest point of the engine E, thereby elevating the engine E. Cooling efficiency and service life; and by providing throttling ribs 74 in the end of the longitudinal passage 7, the throttling ribs 74 are used to regulate the flow of the longitudinal passage 7, thereby allowing the external cooling air to enter the cylinder from the longitudinal passage 7 After the inside of the head 5, it is guided into the transverse passage 6 to cool and cool the Mars plug 53 and then discharged from the opening 61 of the transverse passage 6, thereby reducing the temperature of the Mars plug 53 at the hottest point of the engine E. In order to improve the cooling efficiency and service life of the engine E.

In summary, the present invention can improve the cooling and cooling effect of the engine E by the above structure, thereby achieving the heat dissipation effect of the cylinder head 5 and the engine E as a whole, so as to avoid deformation of the machine parts caused by uneven heat dissipation temperature, and can be improved. The lack of conventional knowledge has improved the efficacy of the learner, and it has become a novelty and progressive element. To apply, please ask for a detailed examination of your review committee. Huisei is approved for the grant of patents.

1‧‧‧Engine Power System

11‧‧‧ crankcase

12‧‧‧Cylinder body

13‧‧‧Cylinder head

131‧‧‧Exhaust gas

132‧‧‧Mars plug

133‧‧‧Intake 埠

134‧‧‧Mechanical storage room

2‧‧‧Air passage

21‧‧‧cross channel

22‧‧‧Longitudinal channel

23‧‧‧Guide members

3‧‧‧ crankcase

4‧‧‧ cylinder

41‧‧‧ Heat sink

5‧‧‧Cylinder head

51‧‧‧ Heat sink

52‧‧‧Intake 埠

53‧‧‧Mars Place

54‧‧‧Exhaust gas

5a‧‧‧left side

5b‧‧‧Lower side

5c‧‧‧right side

5d‧‧‧ upper side

5d1‧‧‧ Windward side

5d2‧‧‧ Downwind

6‧‧‧cross channel

61‧‧‧ openings

7‧‧‧Longitudinal channel

71‧‧‧wind guide

711‧‧‧ convex apex

72‧‧‧The wind blocking convex

721‧‧‧ convex apex

73‧‧‧Wind convex

731‧‧‧ convex apex

74‧‧‧ throttle ribs

7a, 7b‧‧‧ screw hole center point

7c‧‧‧Intake valve seat center point

7d‧‧‧Exhaust valve seat center point

8‧‧‧Guide ribs

81‧‧‧ upper

82‧‧‧ lower

A‧‧‧ imaginary centerline

A1‧‧‧Connecting the center point of the intake valve seat to the center point of the exhaust valve seat

A2‧‧‧ threaded hole center point connection

E‧‧‧ engine

Figure 1 is a schematic diagram of a vehicle engine.

Figure 2 is a partial cross-sectional view of a conventional engine cylinder head.

Figure 3 is a schematic diagram of the engine of the present invention.

Figure 4 is a schematic view showing the arrangement of the air guiding convex portion in the longitudinal passage of the cylinder head of the engine of the present invention.

Figure 5 is a view showing another embodiment of the air passage of the longitudinal passage of the present invention.

Fig. 6 is a schematic view showing the arrangement of the wind guiding convex portion and the wind blocking convex portion in the longitudinal passage of the present invention.

Figure 7 is a schematic view showing the arrangement of the wind blocking convex portion and the air guiding convex portion in the longitudinal passage of the present invention.

Figure 8 is a schematic view of the longitudinal channel air guiding convex portion, the wind blocking convex portion and the air guiding convex portion of the present invention.

Figure 9 is a schematic view showing the arrangement of the throttle ribs of the longitudinal passage of the present invention.

Figure 10 is another embodiment of the longitudinal passage of the present invention in which the throttle rib is provided.

5‧‧‧Cylinder head

52‧‧‧Intake 埠

53‧‧‧Mars Place

54‧‧‧Exhaust gas

5a‧‧‧left side

5b‧‧‧Lower side

5c‧‧‧right side

5d‧‧‧ upper side

5d1‧‧‧ Windward side

5d2‧‧‧ Downwind

6‧‧‧cross channel

61‧‧‧ openings

7‧‧‧Longitudinal channel

71‧‧‧wind guide

711‧‧‧ convex apex

7a, 7b‧‧‧ screw hole center point

7c‧‧‧Intake valve seat center point

7d‧‧‧Exhaust valve seat center point

8‧‧‧Guide ribs

81‧‧‧ upper

82‧‧‧ lower

A‧‧‧ imaginary centerline

A1‧‧‧Connecting the center point of the intake valve seat to the center point of the exhaust valve seat

A2‧‧‧ threaded hole center point connection

Claims (9)

A heat dissipation structure of an engine cylinder head, the engine comprising at least a crankcase, a cylinder disposed on the crankcase, and a cylinder head disposed on the cylinder, the cylinder and the cylinder head extending a plurality of fins; the cylinder head There is an intake port on the left side, a spark plug seat is arranged on the lower side of the cylinder head, and an exhaust port is arranged on the right side of the cylinder head, and a vertical passage through the right side to the left side is opened on the upper side of the cylinder head Further, the cylinder head is provided with a transverse passage from the lower side to the upper side, and the transverse passage is connected with the longitudinal passage, wherein the longitudinal passage is provided with a wind guide at the upper side of the cylinder head toward the transverse passage. a convex portion in which a wind blocking convex portion is protruded toward the upper side of the left side of the cylinder head. A heat dissipation structure of an engine cylinder head, the engine comprising at least a crankcase, a cylinder disposed on the crankcase, and a cylinder head disposed on the cylinder, the cylinder and the cylinder head extending a plurality of fins; the cylinder head There is an intake port on the left side, a spark plug seat is arranged on the lower side of the cylinder head, and an exhaust port is arranged on the right side of the cylinder head, and a vertical passage through the right side to the left side is opened on the upper side of the cylinder head Further, the cylinder head is provided with a transverse passage from the lower side to the upper side, and the transverse passage is connected with the longitudinal passage, wherein the longitudinal passage is convexly arranged on the right side of the cylinder head. And a choke convex portion is protruded from the left side of the longitudinal direction of the cylinder head toward the upper side. The heat dissipation structure of the engine cylinder head according to claim 1 or 2, wherein the cross passage is provided with at least one air guiding rib which is adjacent to the intake port on the left side of the cylinder head, and The upper portion of the air guiding rib extends toward the upper side of the cylinder head. And the lower portion of the wind guiding rib extends toward the spark plug seat on the lower side of the cylinder head. The heat dissipation structure of the engine cylinder head according to claim 2, wherein the air passage convex portion is protruded from the upper side of the cylinder head toward the horizontal passage. The heat dissipation structure of an engine cylinder head according to claim 1 or 2, wherein a throttle rib is provided in the intake passage of the longitudinal direction of the cylinder head toward the cylinder head. The heat dissipation structure of the engine cylinder head according to the second aspect of the invention, wherein the convex apex of the air guiding convex portion is extended toward the lateral passage. The heat dissipation structure of an engine cylinder head according to claim 1 or 2, wherein the cross section of the cylinder head is provided with a wind guiding rib which is adjacent to the intake port on the left side of the cylinder head. An upper portion of the air guiding rib extends toward an upper side of the cylinder head, and a lower portion of the air guiding rib extends toward a Mars plug seat on a lower side of the cylinder head, and a convex apex of the choke convex portion faces an upper portion of the wind guiding rib Extension. The heat dissipation structure of the engine cylinder head according to claim 1, wherein the convex apex of the air guiding convex portion approaches an imaginary center line of the longitudinal passage. The heat dissipation structure of the engine cylinder head according to claim 1, wherein the convex apex of the wind guiding convex portion passes through an imaginary center line of the longitudinal passage.