A motorcycle engine intake valve structure

Abstract

The utility model discloses a motorcycle engine intake valve structure, it includes valve stem and valve head, this valve head fixedly connected at the bottom of this valve stem, the inside of the junction of this valve head with this valve stem is equipped with cooling through -hole, this cooling through -hole is through the center axis of this valve stem, is used for conducting heat of valve head to the upper end of valve stem. Through setting up the cooling through -hole that passes through between valve head and valve stem, realize heat rapid conduction to the upper end of valve stem and cylinder cover cooling system, effectively prevent valve from high temperature deformation or local overheating, improve engine reliability, adopt the embedded joint structure of first, second positioning convex ring and ring groove between valve stem and valve head, valve head and valve seat, and through welding fixed, realize mechanical positioning and high -strength connection, improve structural stability, prevent loosening or falling off, and the top of valve stem is equipped with spring seat and spring part, and the quick opening and closing of valve is realized through spring elastic force.

Description

Technical Field

[0001] This utility model belongs to the field of motorcycle structural technology, specifically relating to a motorcycle engine intake valve structure. Background Technology

[0002] As the core power source of a motorcycle, the performance and lifespan of the engine are closely related to the structural design of its internal components. Among them, the intake valve, as a crucial component controlling the entry of gases into the combustion chamber, operates in an extremely harsh environment, enduring the continuous impact of high-temperature combustion gases and frequent opening and closing movements.

[0003] Existing motorcycle engine intake valve structures generally suffer from poor heat dissipation, unstable sealing performance, and uneven airflow transition. When the engine runs at high speed for extended periods, the connection between the valve head and valve stem is prone to thermal fatigue or deformation due to temperature concentration, which in turn affects the valve's sealing performance and durability.

[0004] In addition, traditional intake valves are mostly solid structures with a lack of effective heat dissipation channels, which leads to excessively high valve head temperatures. The heat is difficult to conduct to the valve stem or other parts for heat dissipation in time, which can easily cause valve erosion, poor sealing, power reduction and other malfunctions.

[0005] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Utility Model Content

[0006] In view of the technical problems mentioned in the background art, the purpose of this utility model is to provide a motorcycle engine intake valve structure to solve the technical problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a motorcycle engine intake valve structure, which includes a valve stem and a valve head. The valve head is fixedly connected to the bottom of the valve stem. A cooling through hole is provided inside the connection between the valve head and the valve stem. The cooling through hole passes through the central axis of the valve stem and is used to conduct the heat of the valve head to the upper end of the valve stem.

[0008] Furthermore, a valve seat is fixedly connected to the bottom of the valve head, and an air guide arc-shaped channel is provided on the side of the valve head. The air guide arc-shaped channel is connected to the intake channel to form a smooth airflow transition area.

[0009] Furthermore, the cooling through hole includes a first through hole and a second through hole, which are arranged opposite to each other, and both the first through hole and the second through hole are semi-circular through holes.

[0010] Furthermore, the upper end of the valve stem is provided with a spring seat, which is in the shape of a circular plate. The upper end of the spring seat is provided with a spring component, which is welded and fixed to the spring seat and sleeved on the upper outer side of the valve stem.

[0011] Furthermore, the bottom of the valve stem is provided with a first annular positioning protrusion, and the top of the valve head is provided with a first annular positioning groove. The diameter of the first positioning groove is larger than the diameter of the first positioning protrusion. The first positioning protrusion is embedded in the first positioning groove, and the connection between the valve head and the valve stem is fixed by welding.

[0012] Furthermore, the top of the valve seat is provided with a second annular positioning protrusion, and the bottom of the valve head is provided with a second annular positioning groove. The diameter of the second positioning groove is larger than the diameter of the second positioning protrusion. The second positioning protrusion is embedded in the second positioning groove, and the connection between the valve seat and the valve head is fixed by welding.

[0013] Furthermore, the top of the valve stem is provided with a valve stem connector, and the outer side of the valve stem connector is recessed with several annular sealing grooves, which are arranged sequentially at intervals.

[0014] Furthermore, the interior of this cooling through-hole can be filled with heat-conducting oil.

[0015] Furthermore, the interior of this cooling through-hole can be filled with a sodium-based heat transfer medium.

[0016] The main advantages of this invention are as follows: The intake valve structure of this motorcycle engine, by providing a through-hole cooling system between the valve head and valve stem, which can be filled with heat-conducting oil or sodium-based heat transfer medium, enables rapid heat transfer to the upper end of the valve stem and the cylinder head cooling system, effectively preventing valve deformation or localized overheating due to high temperatures and improving engine reliability. The valve stem and valve head, and the valve head and valve seat, employ an interlocking structure of first and second positioning convex rings and annular grooves, fixed by welding, achieving mechanical positioning and high-strength connection, improving structural stability, and preventing loosening or detachment. A spring seat and spring components are provided at the top of the valve stem, enabling rapid valve opening and closing through spring force. The multi-stage annular sealing grooves at the valve stem joint ensure airtightness, effectively preventing gas leakage. The overall structural design ensures stable valve operation under high temperature and high load conditions, reducing wear and fatigue cracking, and improving the service life of the entire intake valve structure and the overall reliability of the engine. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the valve stem structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the valve head structure of this utility model.

[0021] Reference numerals: Valve stem 10; Valve head 20; Cooling through hole 30; Valve seat 40; Air guide arc duct 21; First through hole 31; Second through hole 32; Spring seat 11; Spring component 12; First positioning protrusion ring 13; First positioning ring groove 22; Second positioning protrusion ring 41; Second positioning ring groove 23; Valve stem connector 14; Sealing groove 141. Detailed Implementation

[0022] like Figures 1 to 4 As shown, a motorcycle engine intake valve structure includes a valve stem 10 and a valve head 20. The valve head 20 is fixedly connected to the bottom of the valve stem 10. A cooling through hole 30 is provided inside the connection between the valve head 20 and the valve stem 10. The cooling through hole 30 passes through the central axis of the valve stem 10 and is used to form a heat conduction channel during engine operation. The high temperature heat absorbed by the valve head 20 is quickly conducted to the upper end of the valve stem 10 and the cylinder head cooling system, thereby improving heat dissipation efficiency and preventing the valve from deforming due to high temperature.

[0023] In practical implementation, the bottom of the valve head 20 is fixedly connected to the valve seat 40, and the side of the valve head 20 is provided with an air guide arc-shaped channel 21, which is connected to the intake manifold to form a smooth airflow transition area. This makes the airflow entering the combustion chamber more uniform and reduces turbulence, thereby improving the quality of air-fuel mixture formation and increasing combustion efficiency and engine output power. During use, when the engine is in the intake stroke, the valve stem 10 moves downward under the drive of the cam mechanism, causing the valve head 20 to open. Air in the intake manifold smoothly enters the combustion chamber through the air guide arc-shaped channel 21. After the intake stroke ends, the valve stem 10 returns to its original position under the action of the valve spring, causing the valve head 20 and valve seat 40 to seal tightly, forming a tight gas-tight seal to prevent the air-fuel mixture from flowing back into the combustion chamber, thus ensuring the engine's compression ratio and combustion efficiency.

[0024] In practical implementation, the cooling through-hole 30 can be filled with heat-conducting oil or sodium-based heat transfer medium. This medium undergoes phase change convection at high temperatures, further enhancing heat transfer speed and maintaining the valve head 20's operating temperature within a safe range, preventing carbon buildup and fatigue cracks. The cooling through-hole 30 includes a first through-hole 31 and a second through-hole 32, which are positioned opposite each other. Both the first through-hole 31 and the second through-hole 32 are semi-circular through-holes. During use, when the valve head 20 is continuously subjected to high-temperature combustion gases during engine operation, the heat-conducting oil or sodium-based heat transfer medium undergoes phase change flow within the cooling through-hole 30, absorbing and transferring heat from the valve head 20. This heat is then rapidly directed to the cylinder head cooling system through the metal heat conduction path of the valve stem 10, achieving efficient heat dissipation. This effectively prevents localized overheating and deformation of the valve head 20, ensuring stable valve operation under high-temperature and high-load conditions.

[0025] In practical implementation, the upper end of the valve stem 10 is provided with a spring seat 11, which is in the shape of a circular plate. A spring component 12 is provided at the upper end of the spring seat 11 and is welded and fixed to the spring seat 11. The spring component 12 is sleeved on the upper outer side of the valve stem 10. During use, when the engine is in the intake stroke, the cam mechanism pushes the valve stem 10 downwards, and the valve stem 10 overcomes the elastic force of the spring component 12 to open the valve head 20, thus enabling intake. When the cam rotates to the non-operating zone, the spring component 12, under the action of elastic recovery, pushes the valve stem 10 upwards, causing the valve head 20 to re-fit and seal with the valve seat 40, completing the intake valve closing process. Through the elastic restoring force of the spring component 12, the valve opening and closing response is ensured to be rapid and the sealing reliable, thereby improving the valve control accuracy and durability of the engine.

[0026] In practical implementation, the bottom of the valve stem 10 is provided with a first annular positioning protrusion 13, and the top of the valve head 20 is provided with a first annular positioning groove 22. The diameter of the first positioning groove 22 is larger than the diameter of the first positioning protrusion 13. The first positioning protrusion 13 is embedded in the first positioning groove 22. Furthermore, the connection between the valve head 20 and the valve stem 10 is fixed by welding. In use, the interlocking structure between the first positioning protrusion 13 and the first positioning groove 22 can achieve preliminary mechanical positioning before welding, ensuring the coaxiality of the valve stem 10 and the valve head 20, thereby ensuring smooth valve movement and uniform force on the sealing surface during opening and closing. After welding and fixing, the connection strength and stability between the valve head 20 and the valve stem 10 are further enhanced, preventing loosening or detachment under high temperature and high pressure environments, and improving the service life and reliability of the entire intake valve structure.

[0027] In practical implementation, the top of the valve seat 40 is provided with a second annular positioning protrusion 41, and the bottom of the valve head 20 is provided with a second annular positioning groove 23. The diameter of the second positioning groove 23 is larger than the diameter of the second positioning protrusion 41. The second positioning protrusion 41 is embedded in the second positioning groove 23. Furthermore, the connection between the valve seat 40 and the valve head 20 is fixed by welding. In use, the interlocking structure between the second positioning protrusion 41 and the second positioning groove 23 can achieve preliminary mechanical positioning before welding, ensuring that the valve seat 40 and the valve head 20 are coaxial and their relative positions are accurate. This ensures that the sealing surface between the valve head 20 and the valve seat 40 is subjected to uniform force and moves smoothly. After welding and fixing, the connection strength and stability between the valve head 20 and the valve seat 40 are further enhanced, effectively preventing loosening or falling off under high temperature and high pressure conditions, and ensuring the reliability and service life of the entire intake valve structure under high engine load operating conditions.

[0028] In practical implementation, the top of the valve stem 10 is provided with a valve stem connector 14. The outer side of the valve stem connector 14 is recessed with several annular sealing grooves 141. These sealing grooves 141 are arranged in sequence at intervals. In use, the annular sealing grooves 141 can cooperate with corresponding seals to form a multi-stage sealing structure, thereby effectively preventing gas leakage, ensuring the airtightness and working stability between the valve stem 10 and its connecting components, and improving the overall operating efficiency and reliability of the engine.

[0029] In summary, the intake valve structure of this utility model for a motorcycle engine, by providing a through cooling hole 30 between the valve head 20 and the valve stem 10, which can be filled with heat transfer oil or sodium-based heat transfer medium, enables rapid heat transfer to the upper end of the valve stem 10 and the cylinder head cooling system, effectively preventing valve deformation or local overheating due to high temperature and improving engine reliability. The valve stem 10 and the valve head 20, and the valve head 20 and the valve seat 40, adopt an interlocking structure of first and second positioning convex rings and annular grooves, and are fixed by welding to achieve mechanical positioning and high-strength connection, improving structural stability and preventing loosening or falling off. The top of the valve stem 10 is provided with a spring seat 11 and a spring component 12, which enables rapid opening and closing of the valve through spring force. The multi-stage annular sealing groove of the valve stem joint 14 ensures airtightness and effectively prevents gas leakage. The overall structural design ensures stable operation of the valve under high temperature and high load conditions, reduces wear and fatigue crack generation, and improves the service life of the entire intake valve structure and the overall reliability of the engine.

Claims

1. A motorcycle engine intake valve structure, characterized by, It includes a valve stem (10) and a valve head (20). The valve head (20) is fixedly connected to the bottom of the valve stem (10). A cooling through hole (30) is provided inside the connection between the valve head (20) and the valve stem (10). The cooling through hole (30) passes through the central axis of the valve stem (10) and is used to conduct the heat of the valve head (20) to the upper end of the valve stem (10).

2. The motorcycle engine intake valve structure according to claim 1, characterized by, The bottom of the valve head (20) is fixedly connected to the valve seat (40), and the side of the valve head (20) is provided with an air guide arc channel (21), which is connected to the intake channel to form a smooth airflow transition area.

3. The motorcycle engine intake valve structure according to claim 2, characterized by, The cooling through hole (30) includes a first through hole (31) and a second through hole (32), which are arranged opposite to each other. Both the first through hole (31) and the second through hole (32) are semi-circular through holes.

4. The motorcycle engine intake valve structure according to claim 3, characterized by, The upper end of the valve stem (10) is provided with a spring seat (11), which is in the shape of a circular plate. The upper end of the spring seat (11) is provided with a spring component (12), which is welded and fixed on the spring seat (11) and sleeved on the upper outer side of the valve stem (10).

5. The motorcycle engine intake valve structure according to claim 4, characterized by, The bottom of the valve stem (10) is provided with a first annular positioning protrusion (13), and the top of the valve head (20) is provided with a first annular positioning groove (22). The diameter of the first positioning groove (22) is larger than the diameter of the first positioning protrusion (13). The first positioning protrusion (13) is embedded in the first positioning groove (22), and the valve head (20) and the valve stem (10) are fixed by welding.

6. The motorcycle engine intake valve structure according to claim 5, characterized by, The valve seat (40) has a protruding annular second positioning protrusion (41) on its top, and the valve head (20) has a recessed annular second positioning groove (23) on its bottom. The diameter of the second positioning groove (23) is larger than the diameter of the second positioning protrusion (41). The second positioning protrusion (41) is embedded in the second positioning groove (23), and the valve seat (40) and the valve head (20) are fixed by welding at the connection point.

7. The motorcycle engine intake valve structure according to claim 6, characterized by, The valve stem (10) is provided with a valve stem connector (14) at the top. The outer side of the valve stem connector (14) is provided with a number of annular sealing grooves (141), and the number of sealing grooves (141) are arranged in sequence at intervals.

8. The motorcycle engine intake valve structure according to claim 1, characterized by, The interior of the cooling through-hole (30) can be filled with heat-conducting oil.

9. The motorcycle engine intake valve structure according to claim 1, characterized by, The interior of the cooling through-hole (30) can be filled with a sodium-based heat transfer medium.

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