Cylinder head assembly

Abstract

The utility model discloses a cylinder head assembly. Comprising a cylinder head body, a combustion chamber arranged in the cylinder head body, an intake valve seat and an exhaust valve seat which are 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 cylinder body is detachably connected with the cylinder head body and provided with a piston channel communicated with the combustion chamber, the piston is arranged in the piston channel, the outer side part of an intake valve seat and / or an exhaust valve seat protrudes out of the outer side of the combustion chamber, and the intake valve seat and / or the exhaust valve seat protrudes out of the outer side of the combustion chamber. The intake and exhaust circulation area can be effectively increased in a limited space, so that the intake and exhaust resistance is reduced, and the combustion efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of engine components, and particularly relates to a cylinder head assembly. BACKGROUND

[0002] The combustion chamber formed in the traditional engine cylinder head is usually hemispherical, 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 airflow 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 accordingly. The reduction of the size will lead to insufficient intake and exhaust flow area, thereby increasing the intake and exhaust resistance and reducing the combustion efficiency of the engine. In addition, the reduction of the size of the valve seat will also limit the airflow velocity, 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 assembly.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A kind of cylinder head assembly, including cylinder head body, combustion chamber arranged in the cylinder head body, intake valve seat and exhaust valve seat arranged on the combustion chamber, intake passage communicated with the combustion chamber by the intake valve seat, exhaust passage communicated with the combustion chamber by the exhaust valve seat, cylinder body with piston passage communicated with the combustion chamber and being detachably connected with the cylinder head body, and piston arranged in the piston passage, the outer side portion of intake valve seat and / or exhaust valve seat is outwardly protruding from the outer side of the combustion chamber, the cylinder head body has connecting surface connected with the cylinder body, and the combustion chamber is recessed in the connecting surface, in the orthographic projection plane of the connecting surface, the intake valve seat has first side protruding portion outwardly protruding, the exhaust valve seat has second side protruding portion outwardly protruding, and the cross-sectional area of the first side protruding portion is greater than the cross-sectional area of the second side protruding portion.

[0006] Further, the combustion chamber is hemispherical, 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.

[0007] Further, the first side protruding part edge and the second side protruding part edge are both formed with an obtuse angle α between the combustion chamber edge, and the angle α is 120°-150°; the first side protruding part end and the second side protruding part end are formed with an angle β, and the angle β is an obtuse angle.

[0008] Further, the inner diameter of the air inlet is larger than the inner diameter of the exhaust passage.

[0009] Further, the inner diameter of the air inlet is larger than the inner diameter of the exhaust passage.

[0010] Further, the inner diameter of the air inlet is larger than the inner diameter of the exhaust passage.

[0011] Further, the inner diameter of the air inlet is larger than the inner diameter of the exhaust passage.

[0012] Further, the inner diameter of the air inlet is larger than the inner diameter of the exhaust passage.

[0013] In summary, the beneficial effects of this utility model are as follows: First, the first lateral protrusion on the intake valve seat and the second lateral protrusion on the exhaust valve seat protrude towards the outer edge of the combustion chamber. The cross-sectional area of ​​the first lateral protrusion is larger than that of the second lateral protrusion, effectively increasing the intake and exhaust flow area, reducing intake and exhaust resistance, and improving intake and exhaust efficiency. This achieves performance improvement within a limited space, meeting the requirements of small-displacement engines for compact structure and good performance. Second, compared to traditional structural designs, this valve seat design protruding towards the outer edge of the combustion chamber allows for more uniform stress distribution and reduces stress concentration. Especially in small-displacement engines, where space is limited, a reasonable structural design can enhance the structural strength and stability of the valve seat area, improve its durability, and extend the engine's service life. Third, the angles formed between the axes of the intake and exhaust valve seats and the normals to the connecting surfaces, along with the specific shapes (arc-shaped with collinear centers) and angles (α and β being obtuse angles) of the first and second convex portions, provide clear guidance for airflow, forming a stable airflow direction, promoting intake vortices or tumbles, allowing air to enter and exit the combustion chamber more orderly, reducing exhaust gas residue, and improving combustion efficiency and exhaust performance within the combustion chamber. Fourth, valve clearance grooves are provided at corresponding positions on the cylinder block to avoid interference between the cylinder block and the throttle valve, ensuring the throttle valve can be properly installed and function, enabling the throttle valve to accurately adjust intake and exhaust volumes, playing a crucial role in improving engine combustion efficiency and performance. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a cylinder head assembly provided by the present invention.

[0015] Figure 2 for Figure 1 Vertical sectional view.

[0016] Figure 3 for Figure 2 A magnified view of part A in the middle.

[0017] Figure 4 A three-dimensional structural schematic diagram of the cylinder head body is provided for this utility model.

[0018] Figure 5 for Figure 4 A bottom view.

[0019] Figure 6 This is a frontal projection view of the combustion chamber, the first side protrusion, and the edges of the second side protrusion in this utility model.

[0020] Figure 7 for Figure 4 Top view.

[0021] Figure 8 for Figure 7 Sectional view along the AA direction.

[0022] Figure 9 It is the three-dimensional structure schematic view of the cylinder body in the utility model.

[0023] Figure 10 It is Figure 9 The top view.

[0024] Figure 11 It is Figure 10 The B-B section view.

[0025] In the drawing, 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 protruding part, 300 - exhaust valve seat, 310 - exhaust port, 320 - second side protruding part, 400 - cylinder body, 410 - piston channel, 420 - valve accommodation groove, 500 - piston, 600 - intake valve, 700 - exhaust valve. DETAILED DESCRIPTION

[0026] The utility model is further explained below in combination with specific drawing.

[0027] Please refer to Figure 1 And Figure 2 The utility model provides a cylinder head assembly, 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, the exhaust port 310 that passes through exhaust valve seat 300 and is communicated with combustion chamber 111, with the detachable connection of cylinder head body 100 and has a piston channel 410 with combustion chamber 111 of the cylinder body 400 of piston 500 and is arranged in the piston channel 410, 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 resistance of admission and exhaust, improve combustion efficiency. Optimize the valve seat arrangement, improve the airflow passage, be favorable to the promotion of airflow velocity, promote the better formation of mixture, improve the combustion quality. Because of the reduced resistance of admission and exhaust, the combustion quality is improved, can effectively solve the power output decline, fuel economy is poor and the emission performance is deteriorated and other problems caused by the size reduction of small displacement engine.

[0028] Please refer to Figure 3The cylinder head body 100 has a connecting surface 110 connected to the cylinder body 400 of the engine, and a connecting mating surface 120 at the end away from the connecting surface 110. A recessed cavity 121 recessed towards the interior of the cylinder head body 100 is provided on the connecting mating surface 120. Please refer to Figure 7 and Figure 8 An intake valve guide 121A communicating with the intake port 210 and an exhaust valve guide 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 each of the intake valve guide 121A and the exhaust valve guide 121B. The throttle valve includes an intake valve 600 installed in the intake valve guide 121A and an exhaust valve 700 installed in the exhaust valve guide 121B. The intake air volume into the combustion chamber 111 and the exhaust air volume can be accurately controlled. By adjusting the throttle valve opening, the intake air volume and the exhaust air volume can be accurately adjusted according to the needs of different engine operating conditions (such as idle, acceleration, high-speed driving, etc.), so that the engine can maintain good operating conditions under various operating conditions, improve combustion efficiency and power output. According to the actual operation of the engine, the air volume is adjusted in real time, which can effectively avoid the engine performance fluctuations caused by improper intake air volume or exhaust air volume, and improve the engine performance stability.

[0029] Please refer to Figure 4 and Figure 5 The combustion chamber 111 is recessed in the connecting surface 110, and on the orthographic projection plane of the connecting surface 110, the intake valve seat 200 has a first side protrusion 220 protruding outward, and the exhaust valve seat 300 has a second side protrusion 320 protruding outward. The first side protrusion 220 of the intake valve seat 200 and the second side protrusion 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, thereby increasing 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. Increased intake and exhaust flow area and optimized air flow movement help to form more ideal mixture, so that 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.

[0030] Please refer to Figure 6, 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 the flow process, the slower the decay of the flow velocity, so that the airflow 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 process, 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 process, 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.

[0031] Please continue to read Figure 5 The combustion chamber 111 is provided with a spark plug mounting hole 1110 located 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 electrodes of the spark plug can be located in the best ignition area of the combustion chamber 111 to ensure reliable ignition.

[0032] The first side protrusion 220 edge and the second side protrusion 320 edge are both formed with an obtuse angle α between the combustion chamber 111 edge, 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 process, 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.

[0033] On the normal 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 cross-sectional area of the first side protrusion 220 of the intake valve seat 200 and the larger inner diameter of the intake passage 210 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.

[0034] 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, and reduce the intake resistance. This can help more air to enter the combustion chamber 111 under the same intake pressure and improve the intake efficiency.

[0035] 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, promote the mixing of air and fuel, and improve the combustion speed and efficiency, so that the fuel can be completely burned, thereby improving the power output and thermal efficiency of the engine.

[0036] Please refer to Figure 9 , Figure 10 and Figure 11 , the cylinder body 400 is provided with two valve clearance grooves 420 corresponding to the positions of the throttle valve for avoiding the interference between the cylinder body 400 and the throttle valve. The two valve clearance grooves 420 are arranged around the center of the piston passage 410, and the shape of the valve clearance groove 420 is matched with the shape of the corresponding valve. The arrangement of the valve clearance groove 420 can avoid the interference between the cylinder body 400 and the throttle valve, provide enough space for the installation and work of the throttle valve, and make the throttle valve normally open and close in its working stroke, so as to accurately adjust the air volume of the intake passage 200 and the exhaust passage 300.

[0037] 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 intake and exhaust flow area, reduces the intake and exhaust resistance, improves the intake and exhaust efficiency, and realizes performance improvement in limited space, meeting the requirements of small displacement engines for compact structure and good performance. 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. In particular, 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. 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 with common center) and 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 residue, and improve the combustion efficiency and exhaust effect in the combustion chamber 111. The valve clearance groove 420 is provided on the corresponding position of the cylinder body 400 to avoid interference between the cylinder body 400 and the throttle valve, ensure that the throttle valve can be normally installed and worked, and make the throttle valve can accurately adjust the intake and exhaust volume, which plays an important role in improving the combustion efficiency and performance of the engine.

[0038] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, 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 assembly comprising a cylinder head body, a combustion chamber disposed within said cylinder head body, an intake valve seat and an exhaust valve seat disposed on said combustion chamber, an intake port in communication with said combustion chamber through said intake valve seat, an exhaust port in communication with said combustion chamber through said exhaust valve seat, a cylinder block removably attached to said cylinder head body and having a piston passage in communication with said combustion chamber, and a piston disposed within said piston passage, characterized by: The outer 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, 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 part protruding outwardly, the exhaust valve seat has a second side protruding part protruding outwardly, the cross-sectional area of the first side protruding part is greater than the cross-sectional area of the second side protruding part. ​ 2. The cylinder head assembly of claim 1, wherein: 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.

3. The cylinder head assembly of claim 1, wherein: The edge of the first side protruding part and the edge of the second side protruding part are both formed with an obtuse angle α with the edge of the combustion chamber, the angle α is 120°-150°; the end of the first side protruding part and the end of the second side protruding part are formed with an angle β, the angle β is an obtuse angle.

4. The cylinder head assembly of claim 1, wherein: The inner diameter of the intake passage is greater than the inner diameter of the exhaust passage.

5. The cylinder head assembly of claim 4, wherein: The inner diameter of the intake passage is greater than the inner diameter of the exhaust passage.

6. The cylinder head assembly of claim 4, 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.

7. The cylinder head assembly of any one of claims 1-6, wherein: The end of the cylinder head body away from the connecting surface has a connecting fitting surface, the connecting fitting surface is provided with a recessed cavity recessed in the direction of the interior of the cylinder head body, the recessed cavity is provided with an intake valve guide pipe communicated with the intake passage and an exhaust valve guide pipe communicated with the exhaust passage, and the intake valve guide pipe and the exhaust valve guide pipe are provided with one-to-one corresponding throttle valves for adjusting the amount of gas.

8. The cylinder head assembly of claim 7, wherein: The end of the cylinder body close to the combustion chamber is provided with two valve clearance grooves corresponding to the positions of the throttle valves for avoiding the throttle valves, and the two valve clearance grooves are arranged around the center of the piston passage.

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