Cylinder head
By designing outward-protruding intake and exhaust valve seats on the cylinder head of a small-displacement engine and optimizing airflow guidance, the problem of insufficient intake and exhaust flow in small-displacement engines is solved, achieving efficient combustion and improved structural strength, thereby improving engine performance and durability.
Patent Information
- Application Number
- CN202520443181.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-13
AI Technical Summary
In small-displacement engines, the reduced cylinder diameter and the smaller size of the cylinder head combustion chamber and valve seats result in insufficient intake and exhaust flow area, which in turn increases intake and exhaust resistance, affecting combustion efficiency, power output and fuel economy.
The cylinder head structure is designed so that the outer parts of the intake and exhaust valve seats protrude outwards, increasing the flow area. The airflow direction is optimized through the design of specific shapes and angles, and combined with the throttle valve to regulate the air volume, stable and efficient airflow is achieved.
Improving intake and exhaust efficiency within a limited space, enhancing valve seat structural strength, improving combustion quality and exhaust performance, and enhancing engine performance stability and lifespan.
Smart Images
Figure CN223881278U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of engine parts, and particularly relates to a cylinder head. BACKGROUND
[0002] The combustion chamber formed in the traditional engine cylinder head is semispherical, and the intake valve seat connected with the intake passage and the exhaust valve seat connected with the exhaust passage are both arranged in the combustion chamber. This design can effectively optimize the air flow movement and improve the combustion efficiency in large displacement engines. However, when producing small displacement engines, the engine bore is reduced, and the design space is greatly limited. The diameter of the combustion chamber end face of the cylinder head and the size of the valve seat have to be reduced. The reduction of the size will lead to insufficient intake and exhaust flow area, and further increase the intake and exhaust resistance, thereby reducing the combustion efficiency of the engine. In addition, the reduction of the size of the valve seat will also limit the air flow speed, affect the formation of the mixture and the combustion quality, and ultimately lead to the decrease of the power output of the engine, the deterioration of the fuel economy and the deterioration of the emission performance. Therefore, in the design of small displacement engines, how to optimize the arrangement of the valve seat in the limited space to reduce the intake and exhaust resistance and improve the performance of the engine has become an important technical challenge. SUMMARY
[0003] In view of the technical problems existing in the prior art, the utility model provides a cylinder head.
[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0005] A cylinder head, comprising a cylinder head body, a combustion chamber arranged in the cylinder head body, an intake valve seat and an exhaust valve seat arranged on the combustion chamber, an intake passage communicated with the combustion chamber through the intake valve seat, and an exhaust passage communicated with the combustion chamber through the exhaust valve seat, the outer side part of the intake valve seat and / or the exhaust valve seat protrudes outwardly from the outer side of the combustion chamber, the cylinder head body has a connecting surface connected with the cylinder body of the engine, the combustion chamber is recessed in the connecting surface, on the orthographic projection plane of the connecting surface, the intake valve seat has a first side protruding part protruding outwardly, the exhaust valve seat has a second side protruding part protruding outwardly, and the cross-sectional area of the first side protruding part is greater than that of the second side protruding part.
[0006] Further, the combustion chamber is semispherical, the first side protruding part and the second side protruding part are both circular arc structures, and the centers of the first side protruding part and the second side protruding part are on the same straight line.
[0007] Further, a spark plug mounting hole is arranged in the combustion chamber between the intake valve seat and the exhaust valve seat.
[0008] Further, the first side protruding part edge and the second side protruding part edge are formed with an obtuse angle alpha between the combustion chamber edge, and the angle alpha is 120-150 degrees; the first side protruding part end and the second side protruding part end are formed with an angle beta, and the angle beta is an obtuse angle.
[0009] Further, the inner diameter of the air inlet channel is larger than the inner diameter of the air outlet channel.
[0010] Further, the air inlet channel is connected by a smooth and continuous curve between any adjacent sections.
[0011] Further, the air inlet valve seat axis and the air outlet valve seat axis form an angle with the normal direction of the connecting surface.
[0012] Further, the cylinder head body is provided with a connecting matching surface at one end away from the connecting surface, a recessed cavity recessed towards the cylinder head body interior is arranged on the connecting matching surface, an air inlet valve guide pipe communicated with the air inlet channel and an air outlet valve guide pipe communicated with the air outlet channel are arranged in the recessed cavity, and a throttle valve for adjusting air volume is arranged in the air inlet valve guide pipe and the air outlet valve guide pipe one by one.
[0013] In summary, the beneficial effects of the utility model are as follows: 1. The first side protruding part on the air inlet valve seat and the second side protruding part on the air outlet valve seat protrude towards the combustion chamber outer edge, the first side protruding part cross-sectional area is larger than the second side protruding part, the air inlet and outlet flow area is effectively increased, the air inlet and outlet resistance is reduced, the air inlet and outlet efficiency is improved, the performance is improved in limited space, and the requirements of compact structure and good performance of small displacement engine are met. 2. Compared with the traditional structure design, the air valve seat design protruding towards the combustion chamber outer edge can make the structure stress more uniform and reduce the stress concentration phenomenon. Especially in small displacement engine, due to limited space, reasonable structure design can enhance the structure strength and stability of the air valve seat area, improve the durability, and prolong the service life of the engine. 3. The air inlet valve seat and the air outlet valve seat axis form an angle with the normal direction of the connecting surface, and the specific shape (circular arc shape and common center) and the angle (alpha, beta is an obtuse angle) of the first side protruding part and the second side protruding part provide clear guidance for airflow, form stable airflow direction, promote air inlet vortex or rolling flow, make air more orderly enter and exit the combustion chamber, reduce exhaust gas residue, and improve the combustion efficiency and exhaust effect in the combustion chamber. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 A structure schematic view of the cylinder head is provided.
[0015] Figure 2 A Figure 1 bottom view.
[0016] Figure 3 is a front projection view of the edge of the combustion chamber, the first side protrusion and the second side protrusion in the utility model.
[0017] Figure 4 is a top view. Figure 1
[0018] Figure 5 is a sectional view along A-A direction in the utility model. Figure 4
[0019] In the figure, 100 - cylinder head body, 110 - connecting surface, 111 - combustion chamber, 1110 - spark plug mounting hole, 120 - connecting matching surface, 121 - recessed cavity, 121A - intake valve guide pipe, 121B - exhaust valve guide pipe, 200 - intake valve seat, 210 - intake port, 220 - first side protrusion, 300 - exhaust valve seat, 310 - exhaust port, 320 - second side protrusion. DETAILED DESCRIPTION
[0020] The utility model is further described below in combination with specific drawings.
[0021] Please refer to Figure 1 and Figure 2 The utility model provides a cylinder head, including cylinder head body 100, be located in the combustion chamber 111 of cylinder head body 100, be located on the intake valve seat 200 and exhaust valve seat 300 of combustion chamber 111, the intake port 210 that passes through intake valve seat 200 and is communicated with combustion chamber 111 and the exhaust port 310 that passes through exhaust valve seat 300 and is communicated with combustion chamber 111, the outside portion of intake valve seat 200 and / or exhaust valve seat 300 is protruding to the outside of combustion chamber 111. Intake valve seat 200 and / or exhaust valve seat 300 protrude to the outside of combustion chamber 111, can effectively increase the flow area of admission and exhaust in limited space, thereby reduce the admission and exhaust resistance, improve combustion efficiency. Optimize the valve seat arrangement, improve the airflow passage, be favorable to the promotion airflow velocity, promote mixed gas to form better, improve the combustion quality. Because admission and exhaust resistance reduce, combustion quality improves, can effectively solve the problem such as the power output drop, fuel economy becomes poor and emission performance deterioration caused by the size reduction of small displacement engine.
[0022] Please refer to Figure 4 and Figure 5 The cylinder head body 100 has a connecting surface 110 connected to the cylinder body of the engine, and one end of the cylinder head body 100 away from the connecting surface 110 has a connecting matching surface 120. A recessed cavity 121 recessed towards the inside of the cylinder head body 100 is provided on the connecting matching surface 120, an intake valve guide pipe 121A communicating with the intake port 210 and an exhaust valve guide pipe 121B communicating with the exhaust port 310 are provided in the recessed cavity 121, and a throttle valve for adjusting the air volume is provided in the intake valve guide pipe 121A and the exhaust valve guide pipe 121B one by one. The intake air volume entering the combustion chamber 111 and the exhaust air volume can be accurately controlled. By adjusting the opening degree of the throttle valve, the intake air volume and the exhaust air volume can be accurately adjusted according to the needs of different working conditions of the engine (such as idling, acceleration, high-speed driving, etc.), so that the engine can maintain good running state under various working conditions, improve combustion efficiency and power output. According to the actual running condition of the engine, the air volume is adjusted in real time, which can effectively avoid the fluctuation of engine performance caused by improper intake air volume or exhaust air volume, and improve the stability of engine performance.
[0023] Please continue to read Figure 2 The combustion chamber 111 is recessed in the connecting surface 110, and on the projection surface of the connecting surface 110, the intake valve seat 200 has a first side protruding part 220 protruding outward, and the exhaust valve seat 300 has a second side protruding part 320 protruding outward. The first side protruding part 220 of the intake valve seat 200 and the second side protruding part 320 of the exhaust valve seat 300 protrude outward, which can increase the size of the intake and exhaust valve seat 300 in a limited space, and further increase the flow area of the intake and exhaust. This is particularly important for small displacement engines, which can effectively alleviate the problem of insufficient intake and exhaust flow area caused by reduced cylinder diameter, reduce intake and exhaust resistance, improve engine intake efficiency and exhaust smoothness, and thus improve combustion efficiency. The increased intake and exhaust flow area and optimized air flow movement help to form more ideal mixture, so that the fuel can be more fully burned. Full combustion not only improves the thermal efficiency of the engine, reduces fuel consumption, but also reduces harmful gas emissions, improves the fuel economy and emission performance of the engine.
[0024] The combustion chamber 111 is semispherical, the first side protrusion 220 and the second side protrusion 320 are both circular arc structures, and the circular arc structures are smoother than sharp or irregular shapes. When the airflow flows through the first side protrusion 220 of the intake valve seat 200 and the second side protrusion 320 of the exhaust valve seat 300, the smooth circular arc surface can reduce the collision and friction between the airflow and the wall surface. According to the principle of fluid mechanics, the smaller the resistance encountered by the airflow during flow, the slower the decay of its flow rate, so that it can flow more smoothly through the valve seat area and enter or exhaust the combustion chamber 111. The centers of the first side protrusion 220 and the second side protrusion 320 are on the same straight line. This regular geometric layout provides a clear guide for the airflow. During the intake, the air can enter the combustion chamber 111 at a relatively stable angle and direction under the guidance of the circular arc first side protrusion 220, which helps to form uniform mixed gas. Similarly, during the exhaust, the exhaust gas can be more orderly discharged from the combustion chamber 111 under the guidance of the second side protrusion 320, reducing exhaust gas residue. This stable airflow direction helps to improve the combustion efficiency and exhaust effect in the combustion chamber 111. It should be noted that the present application is not limited to the case where the centers of the first side protrusion 220 and the second side protrusion 320 are on the same straight line. In other possible embodiments, the centers of the first side protrusion 220 and the second side protrusion 320 can also not be on the same straight line.
[0025] The combustion chamber 111 is provided with a spark plug mounting hole 1110 between the intake valve seat 200 and the exhaust valve seat 300, which provides an accurate mounting position for the spark plug, so that the electrode of the spark plug can be in the best ignition area of the combustion chamber 111 to ensure reliable ignition.
[0026] Please refer to Figure 3 The edge of the first side protrusion 220 and the edge of the second side protrusion 320 form an obtuse angle α with the edge of the combustion chamber 111, and the angle α is 120°-150°. During the intake process, the air can flow more smoothly into the combustion chamber 111 along this angle, avoiding direct impact of the airflow on the wall surface to cause energy loss and turbulence. During the exhaust, the exhaust gas can also be more effectively discharged, reducing exhaust gas residue. At the same time, this angle setting helps to make the airflow more uniformly distributed in the combustion chamber 111, promoting the full mixing of the mixed gas and creating good conditions for efficient combustion. An angle β is formed between the end of the first side protrusion 220 and the end of the second side protrusion 320, and the angle β is an obtuse angle. The obtuse angle β helps to form a specific airflow movement pattern in the combustion chamber 111. This airflow movement can enhance the turbulence degree of the mixed gas, so that the fuel and air can be more fully contacted and mixed, thereby improving the combustion speed and combustion efficiency.
[0027] On the front projection plane of the connecting surface 110, the cross-sectional area of the first side protrusion 220 is larger than that of the second side protrusion 320, and the inner diameter of the intake passage 210 is larger than that of the exhaust passage 310. The larger inner diameter of the intake passage 210 and the larger cross-sectional area of the first side protrusion 220 of the intake valve seat 200 can increase the effective flow area of the intake passage. During the intake stroke of the engine, the larger intake passage can allow more air to enter the combustion chamber 111 in the same time. Sufficient air intake can help to form a more ideal air-fuel ratio, which can ensure the complete combustion of fuel. For example, during high-speed operation of the engine, the larger air intake can meet the oxygen demand of the engine and improve the power output of the engine. The smaller inner diameter of the exhaust passage 310 can increase the exhaust flow rate to some extent, which can help to exhaust the exhaust gas in the combustion chamber 111 more thoroughly and prepare for the next intake.
[0028] The smooth and continuous curves between any adjacent cross sections inside the intake passage 210 can make the airflow pass through the intake passage 210 more smoothly, reduce the friction and collision between the airflow and the wall surface, and reduce the intake resistance. This can help more air to enter the combustion chamber 111 under the same intake pressure, thereby improving the intake efficiency.
[0029] The axes of the intake valve seat 200 and the exhaust valve seat 300 form an angle with the normal direction of the connecting surface 110. The existence of the angle changes the arrangement angle of the intake and exhaust valves, so that the movement trajectory of the intake and exhaust flows changes when entering and exiting the combustion chamber 111. During the intake process, the air enters the combustion chamber 111 at a certain angle, which can generate stronger intake swirl or tumble flow, and promote the air and fuel to mix more fully. This good mixture formation can help to improve the combustion speed and efficiency, so that the fuel can be more completely burned, thereby improving the power output and thermal efficiency of the engine.
[0030] The first side protrusion 220 on the intake valve seat 200 and the second side protrusion 320 on the exhaust valve seat 300 protrude outward from the outer edge of the combustion chamber 111, the cross-sectional area of the first side protrusion 220 is larger than that of the second side protrusion 320, which effectively increases the flow area of intake and exhaust air, reduces the resistance of intake and exhaust air, improves the efficiency of intake and exhaust air, realizes performance improvement in limited space, and meets the requirements of small displacement engines for compact structure and good performance. Two, compared with the traditional structure design, the valve seat design protruding outward from the outer edge of the combustion chamber 111 can make the structure stress more uniform and reduce stress concentration. Especially in small displacement engines, due to limited space, reasonable structure design can enhance the structural strength and stability of the valve seat area, improve its durability, and prolong the service life of the engine. Three, the axes of the intake valve seat 200 and the exhaust valve seat 300 form an angle with the normal line of the connecting surface 110, and the specific shape (circular arc shape and common center) and the angle (α and β are obtuse angles) of the first side protrusion 220 and the second side protrusion 320 provide clear guidance for airflow, form stable airflow direction, promote intake swirl or tumble flow, make air more orderly enter and exit the combustion chamber 111, reduce exhaust gas residue, and improve the combustion efficiency and exhaust effect in the combustion chamber 111.
[0031] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present application.
Claims
1. A cylinder head comprising a head body, a combustion chamber provided in the head body, an intake valve seat and an exhaust valve seat provided on the combustion chamber, an intake port communicating with the combustion chamber through the intake valve seat, and an exhaust port communicating with the combustion chamber through the exhaust valve seat, characterized in that: The outer side portion of the intake valve seat and / or the exhaust valve seat protrudes outwardly from the outer side of the combustion chamber, the cylinder head body has a connecting surface connected with the cylinder body of the engine, the combustion chamber is recessed in the connecting surface, on the orthographic projection surface of the connecting surface, the intake valve seat has a first side protruding portion protruding outwardly, the exhaust valve seat has a second side protruding portion protruding outwardly, the cross-sectional area of the first side protruding portion is greater than the cross-sectional area of the second side protruding portion.
2. The cylinder head of claim 1, wherein: The combustion chamber is semispherical, the first side protruding portion and the second side protruding portion are both circular arc structures, and the centers of the first side protruding portion and the second side protruding portion are on the same straight line.
3. The cylinder head of claim 1, wherein: A spark plug mounting hole is arranged in the combustion chamber between the intake valve seat and the exhaust valve seat.
4. The cylinder head of claim 1, wherein: An obtuse angle α is formed between the edge of the first side protruding portion and the edge of the combustion chamber, and an obtuse angle β is formed between the edge of the second side protruding portion and the edge of the combustion chamber, the angle α is 120°-150°, and the angle β is an obtuse angle.
5. The cylinder head of claim 1, wherein: The inner diameter of the intake passage is greater than the inner diameter of the exhaust passage.
6. The cylinder head of claim 5, wherein: Any adjacent sections inside the intake passage are connected by smooth and continuous curves.
7. The cylinder head of claim 5, wherein: The axis of the intake valve seat and the axis of the exhaust valve seat form an angle with the normal direction of the connecting surface.
8. The gas cylinder head of any one of claims 1-7, wherein: The end of the cylinder head body away from the connecting surface has a connecting and matching surface, a recessed cavity recessed towards the inside of the cylinder head body is arranged on the connecting and matching surface, an intake valve guide pipe communicating with the intake passage and an exhaust valve guide pipe communicating with the exhaust passage are arranged in the recessed cavity, and a throttle valve for adjusting the air volume is arranged in the intake valve guide pipe and the exhaust valve guide pipe one by one.