Air cooling exhaust valve and internal combustion engine exhaust valve mechanism

Abstract

The embodiment of the invention provides an air cooling exhaust valve and an internal combustion engine exhaust valve mechanism. The exhaust valve is composed of an upper valve rod, a valve body and a valve ring, the upper valve rod of the air valve is connected with the valve body of a rod hollow structure through friction welding, radial cooling drill holes are machined in the bottom and the arc position of the valve body, and cooling air exhaust holes are formed in the position close to the junction of a low-stress valve disc and the valve rod. And the valve ring and the valve body are welded to block and seal the drill hole at the valve disc. Cooling air flow channels are designed on the cylinder cover and the air valve guide pipe, and cooling air is conveyed to the exhaust valve. Cooling air is fed into a valve rod center hole and discharged into an air channel, the flow channel at the valve rod is simple in structure and large in flow section, the cooling drill holes cover the firepower face with high heat load and the round corner of the valve disc, the cooling effect is good, and the influence of the flow channel arrangement on the structure and rigidity of the air valve is small.

Description

Technical Field

[0001] This application relates to the field of engine valve design technology, and in particular to an air-cooled exhaust valve and an internal combustion engine exhaust valve mechanism. Background Technology

[0002] The exhaust valve is one of the key components of an engine, controlling the intake and exhaust of the combustion chamber. It operates under conditions of high temperature, heavy load, and poor lubrication, making it one of the most challenging parts to design and prone to wear and failure. As engine performance targets increase, exhaust valve temperatures rise, necessitating effective cooling measures to keep valve temperatures within acceptable limits. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a hollow drilling air cooling exhaust valve solution.

[0004] This invention proposes a hollow drilled air cooling and cooling air passage venting exhaust valve scheme. The valve stem only has an air intake passage. After cooling, the air is discharged into the air passage. The valve stem cooling passage has a large cross-sectional area, and the cooling borehole has a large cooling area, which can improve the cooling effect. The arrangement of the cooling borehole does not affect the exhaust in the cylinder, and the structure is simple.

[0005] This invention provides an air-cooled exhaust valve, including an exhaust valve body, a valve guide pipe, and a cylinder head;

[0006] The exhaust valve body is composed of an upper valve stem, a valve body, and a valve ring. The upper valve stem and the valve body, which has a hollow stem structure, are connected by friction welding. The valve ring is welded and fixed to the valve body, and the valve ring drills a hole in the valve disc of the valve body to form a sealing block.

[0007] The lower part of the valve body is provided with radial cooling holes and axial cooling holes, and the lower outer periphery of the valve body is made with an annular cut. Radial cooling holes are evenly distributed from the annular cut area near the bottom of the valve disc, and radially inclined cooling holes are provided from the annular cut area near the arc area of ​​the valve disc. The valve body is machined with multiple radial air inlets. While ensuring the total air inlet cross section, the diameter of the holes is reduced, thereby reducing the weakening of the valve stem strength by the holes.

[0008] A partial annular cut is made near the area where the valve disc intersects with the upper valve stem, and a cooling air exhaust hole is provided in the corresponding area of ​​the partial annular cut. The cooling air exhaust hole is arranged in the low-stress area at the junction of the valve disc and the upper valve stem.

[0009] The valve guide shoulder is uniformly provided with multiple oblique drill holes and annular grooves. The cylinder head is provided with drill holes and grooves that match and connect with the oblique drill holes and annular grooves of the valve guide, forming a cooling air flow channel. The air inlet of the cooling air flow channel is connected to the intake system after the diesel engine is turbocharged and intercooled. The cooling air enters the hollow structure of the valve body through the cooling air flow channel, and then flows through the bottom of the valve disc, the vicinity of the sealing surface and the arc area through each cooling drill hole. After absorbing heat, it is discharged upward into the air passage under the guidance of the valve stem.

[0010] In some embodiments, the cooling air comes from the intake air after the intercooler is pressurized.

[0011] In some embodiments, the radial cooling holes and axial cooling holes at the lower part of the valve body are radially distributed to improve the cooling effect.

[0012] In some embodiments, the shoulder of the valve guide is uniformly designed with multiple oblique drill holes and annular grooves, and the cylinder head is designed with drill holes and grooves that are connected to each other, which can deliver cooling air to the exhaust valve.

[0013] In some embodiments, the cylinder head and the valve guide are designed with cooling air channels to deliver cooling air to the exhaust valve.

[0014] This invention provides an internal combustion engine exhaust valve mechanism, comprising:

[0015] The cylinder head serves as the mounting base for the entire valve mechanism;

[0016] The valve guide is press-fitted into a preset hole in the cylinder head by an interference fit, and its axis is perpendicular to the cylinder head sealing surface.

[0017] The valve seat is fixed to the air passage port of the cylinder head by an interference fit, and its sealing surface is coaxial with the axis of the air valve guide.

[0018] A sealing ring is installed on the mating end face or gap between the valve guide and the cylinder head to seal the gap between them by compression.

[0019] A reciprocating sealing actuator unit is formed with the valve body and the upper valve stem as its core. The upper end of the upper valve stem passes through the air valve guide, and the two are fitted with a clearance.

[0020] The valve ring is fitted onto the lower step of the valve body and positioned via a transition fit.

[0021] The locking clip has a split structure and fits into the annular groove at the upper end of the valve stem;

[0022] The valve spring is fitted on the outside of the upper valve stem, with its lower end supported on the spring seat of the cylinder head and its upper end pressing against the end face of the locking clip.

[0023] The rotary valve is installed between the locking clamp and the upper end of the valve spring, and is connected to the upper valve stem through a fitting.

[0024] In some embodiments, the valve body and the upper valve stem are integrally formed or fixed by welding.

[0025] In some embodiments, the upper valve stem, the valve body, and the valve ring constitute the exhaust valve body. The lower part of the valve body is designed with radial and axial cooling holes. The lower outer periphery of the valve body is annularly cut off. The cut area near the bottom of the valve disc is designed with evenly distributed radial cooling holes. The cut area near the arc area of ​​the valve disc is designed with radially inclined cooling holes. The area near the intersection of the valve disc and the valve stem is locally annularly cut off.

[0026] In some embodiments, the shoulder of the valve guide is uniformly designed with multiple oblique drilled holes and annular grooves, and the cylinder head is designed with drilled holes and grooves that are interconnected to deliver cooling air to the exhaust valve. The inner bore is partially slotted to facilitate communication with the radial hole of the valve stem.

[0027] In some embodiments, the cylinder head and the valve guide are designed with cooling air channels to deliver cooling air to the exhaust valve.

[0028] To address the shortcomings of existing technologies, this invention provides a hollow drilled air-cooled exhaust valve solution. The cooling air is introduced through the valve stem center hole and discharged into the air passage. The flow channel structure at the valve stem is simple and has a large flow cross-section. The cooling drill holes cover the high-heat-load fire surface and the rounded corners of the valve disc, resulting in good cooling effect. The flow channel arrangement has little impact on the valve structure and rigidity. Attached Figure Description

[0029] The accompanying drawings illustrate, by way of example and not limitation, the various embodiments discussed herein.

[0030] Figure 1 A schematic cross-sectional view of the exhaust valve mechanism of an internal combustion engine.

[0031] Figure 2 For the corresponding Figure 1 A schematic diagram of the partial structure at point B in the middle;

[0032] Figure 3 For the corresponding Figure 1 A schematic diagram of the partial structure at point A in the middle. Detailed Implementation

[0033] In order to gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this application.

[0034] In the embodiments described in this application, it should be noted that, unless otherwise stated and limited, the term "connection" should be interpreted broadly. For example, it can be an electrical connection, or a connection between two internal components. It can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above term according to the specific circumstances.

[0035] It should be noted that the terms "first," "second," and "third" used in the embodiments of this application are merely used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first," "second," and "third" can be interchanged in a specific order or sequence where permitted. It should be understood that the objects distinguished by "first," "second," and "third" can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0036] This invention provides an internal combustion engine exhaust valve mechanism, the structure of which is as follows: Figures 1 to 3 As shown, the functions and assembly relationships of each component are as follows:

[0037] Valve ring 1: serves a sealing function.

[0038] Valve body 2: This is the core moving part of the air valve, which controls the intake or exhaust of the cylinder by opening and closing.

[0039] Valve seat 3: It forms a sealing surface with the valve body to ensure that the gas and cooling water in the cylinder do not leak.

[0040] Valve guide 4: Provides guidance for the valve stem, ensuring the straightness of the valve body movement and reducing wear.

[0041] Sealing ring 5: Used to seal the gap between the valve guide and the cylinder head to prevent gas or lubricating oil leakage.

[0042] Upper valve stem 6: connects the valve body to the upper spring, locking clip and other components, and transmits motion and force.

[0043] Locking clip 7: Transmits the spring force of the air valve spring to the upper valve stem, while locking the position of the air valve to prevent it from falling off.

[0044] Rotary valve 8: It causes the air valve to rotate during the opening and closing process, which can evenly wear the sealing surface and extend the life of the air valve.

[0045] Air valve spring 9: Provides elastic force so that the air valve fits tightly against the valve seat when closed, and relies on a cam or other mechanism to overcome the spring force when open.

[0046] Cylinder head 10: It is the mounting base for the valve mechanism, integrating structures such as the air intake port, and sealing the top of the cylinder.

[0047] The entire mechanism controls the intake or exhaust process of the cylinder. By opening and closing the valves in coordination with the piston movement, it realizes the gas exchange cycle of the internal combustion engine and ensures the normal operation of the engine.

[0048] The connection methods and fit relationships of the various structures in the valve mechanism of an internal combustion engine are as follows:

[0049] The cylinder head 10 is the mounting base for the entire valve mechanism, and all key components are positioned and assembled with the cylinder head as the reference.

[0050] The valve guide 4 is press-fitted into the preset hole in the cylinder head 10 by interference fit, ensuring that the guide axis is perpendicular to the cylinder head sealing surface, and providing precise guidance for the movement of the valve stem.

[0051] The valve seat 3 is fixed to the air passage port of the cylinder head 10 by interference fit, and its sealing surface is coaxial with the axis of the air valve guide 4 to ensure the sealing accuracy between the valve body and the valve seat.

[0052] The sealing ring 5 is installed on the mating end face or gap between the valve guide 4 and the cylinder head 10. It seals the gap between the two by pressing and sealing to prevent gas leakage in the cylinder or lubricating oil in the cylinder head from seeping into the air passage.

[0053] With valve body 2 and upper valve stem 6 as the core, a reciprocating sealing actuator is formed.

[0054] The valve body 2 and the upper valve stem 6 are integrally formed or fixed by welding. The upper end of the upper valve stem 6 passes through the air valve guide 4. The two adopt a clearance fit, which allows the upper valve stem 6 to slide back and forth along the guide axis, while reducing wear through the lubricating oil film and limiting the radial swing of the valve stem.

[0055] Valve ring 1 is fitted onto the step of valve body 2 and positioned by transition fit to seal the cooling air hole.

[0056] The valve is closed and reset, and components are locked using springs and clamps, ensuring reliable operation.

[0057] The upper end of the upper valve stem 6 is machined with an annular groove, and the locking clip 7 is a split structure. It is inserted into the groove through a snap-fit, so that the locking clip and the upper valve stem can be detachably fixed.

[0058] The air valve spring 9 is fitted on the outside of the upper valve stem 6, with its lower end supported on the spring seat of the cylinder head 10 and its upper end pressed against the end face of the locking clip 7. The spring is in a pre-compressed state, and the locking clip 7 transmits continuous elastic pressure to the upper valve stem 6, ultimately forcing the sealing surface of the valve body 2 to tightly fit the valve seat 3, thereby closing the air valve.

[0059] The rotary valve 8 is installed between the locking clip 7 and the upper end of the air valve spring 9, and is associated with the upper valve stem 6 through a fitting: the elastic force of the air valve spring 9 keeps the rotary valve 8 in contact with the locking clip 7. When the air valve reciprocates, the elastic structure or inclined surface design inside the rotary valve will generate circumferential torque, which will drive the upper valve stem 6 and the valve body 2 to rotate slowly.

[0060] The combination of various components enables the precise opening and closing of the air valve:

[0061] The cylinder head 10, valve guide 4, and valve seat 3 form a rigid reference to ensure the alignment of the valve movement trajectory and the sealing surface.

[0062] The valve spring 9 and locking clip 7 provide elastic clamping force to ensure reliable sealing when the valve is closed.

[0063] The clearance fit between the upper valve stem 6 and the air valve guide 4, the sealing fit between the valve body 2 and the valve seat 3, and the circumferential transmission fit of the rotary valve 8 together achieve the function of reciprocating motion and uniform rotational wear, thus extending the service life of the mechanism.

[0064] This patent proposes a hollow drilled air cooling and cooling air passage venting exhaust valve scheme. The valve stem only has an air intake passage. After cooling, the air is discharged into the air passage. The valve stem cooling passage has a large cross-sectional area, and the cooling drilled hole has a large cooling area, which can improve the cooling effect. The arrangement of the cooling drilled hole does not affect the exhaust in the cylinder, and the structure is simple.

[0065] This invention provides an air-cooled exhaust valve, such as... Figures 1 to 3 As shown, the exhaust valve body is welded from three parts: the upper valve stem 6, the valve body 2, and the valve ring 1. The lower part of the valve body 2 has radial and axial cooling holes. The lower outer circumference of the valve body 2 is annularly cut off. Evenly distributed radial cooling holes are designed near the bottom of the valve disc from the cut-off area. Radially inclined cooling holes are designed near the arc-shaped area of ​​the valve disc from the cut-off area. A partial annular cut is made near the intersection of the valve disc and the valve stem, allowing cooling air to exit through the cooling holes. After absorbing heat, the cooling air is guided upwards by the valve stem and discharged into the air passage.

[0066] The cooling borehole of the exhaust valve and the annular cut-off of the lower outer periphery of the valve disc have little impact on the stiffness and force transmission of the exhaust valve.

[0067] The valve guide shoulder is evenly designed with multiple oblique drilled holes and annular grooves, and the cylinder head is designed with drilled holes and grooves that are interconnected, which can supply cooling air to the exhaust valve. The cooling air can come from the intake air after the turbocharger and intercooler.

[0068] The valve consists of three parts: the upper valve stem, the valve body, and the valve ring. The upper valve stem and the hollow valve body are connected by friction welding. Radial cooling holes are machined on the bottom and arc of the valve body. Cooling air exhaust ports are located near the low-stress junction of the valve disc and valve stem. The holes on the valve disc are sealed by welding the valve ring to the valve body. Cooling air flow channels are designed on the cylinder head and valve guide to supply cooling air to the exhaust valve.

[0069] When the diesel engine is running, cooling air can cool the bottom of the valve disc, the area near the sealing surface, and the arc-shaped area, which are subject to high heat loads. The cooled air is then guided upwards into the air passage near the valve stem by the valve stem.

[0070] The above embodiments of the present invention provide a hollow drilled air-cooled exhaust valve scheme. The cooling air is introduced into the valve stem center hole and discharged into the air passage. The flow channel structure at the valve stem is simple and has a large flow cross section. The cooling drill hole arrangement covers the high heat load fire surface and the rounded corner of the valve disc, resulting in good cooling effect. The flow channel arrangement has little impact on the valve structure and rigidity. The cooled air is guided by the valve stem near the valve stem and discharged upward into the air passage, with little interference to the exhaust in the cylinder.

[0071] The technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An air-cooled exhaust valve, characterized in that, Includes the exhaust valve body, valve guide, and cylinder head; The exhaust valve body is composed of an upper valve stem, a valve body, and a valve ring. The upper valve stem and the valve body, which has a hollow stem structure, are connected by friction welding. The valve ring is welded and fixed to the valve body, and the valve ring drills a hole in the valve disc of the valve body to form a sealing block. The lower part of the valve body is provided with radial cooling holes and axial cooling holes, and the lower outer periphery of the valve body is made of annular cut-off treatment. Radial cooling holes are evenly distributed from the annular cut-off area near the bottom of the valve disc, and radially inclined cooling holes are provided from the annular cut-off area near the arc area of ​​the valve disc. A partial annular cut is made near the area where the valve disc intersects with the upper valve stem, and a cooling air exhaust hole is provided in the corresponding area of ​​the partial annular cut. The cooling air exhaust hole is arranged in the low-stress area at the junction of the valve disc and the upper valve stem. The valve guide shoulder is uniformly provided with multiple oblique drill holes and annular grooves. The cylinder head is provided with drill holes and grooves that match and connect with the oblique drill holes and annular grooves of the valve guide, forming a cooling air flow channel. The air inlet of the cooling air flow channel is connected to the intake system after the diesel engine is turbocharged and intercooled. The cooling air enters the hollow structure of the valve body through the cooling air flow channel, and then flows through the bottom of the valve disc, the vicinity of the sealing surface and the arc area through each cooling drill hole. After absorbing heat, it is discharged upward into the air passage under the guidance of the valve stem.

2. The air-cooled exhaust valve according to claim 1, characterized in that, The cooling air comes from the intake air after the intercooler is pressurized.

3. The air-cooled exhaust valve according to claim 1, characterized in that, The radial and axial cooling holes at the bottom of the valve body are distributed radially to improve the cooling effect.

4. The internal combustion engine valve mechanism according to claim 1, characterized in that, The shoulder of the valve guide is uniformly designed with multiple oblique drill holes and annular grooves, and the cylinder head is designed with drill holes and grooves that are connected to each other, which can deliver cooling air to the exhaust valve.

5. The internal combustion engine valve mechanism according to claim 1, characterized in that, The cylinder head and the valve guide are designed with cooling air channels to deliver cooling air to the exhaust valve.

6. An exhaust valve mechanism for an internal combustion engine, characterized in that, include: The cylinder head serves as the mounting base for the entire valve mechanism; The valve guide is press-fitted into a preset hole in the cylinder head by an interference fit, and its axis is perpendicular to the cylinder head sealing surface. The valve seat is fixed to the air passage port of the cylinder head by an interference fit, and its sealing surface is coaxial with the axis of the air valve guide. A sealing ring is installed on the mating end face or gap between the valve guide and the cylinder head to seal the gap between them by compression. A reciprocating sealing actuator unit is formed with the valve body and the upper valve stem as its core. The upper end of the upper valve stem passes through the air valve guide, and the two are fitted with a clearance. The valve ring is fitted onto the lower step of the valve body and positioned via a transition fit. The locking clip has a split structure and fits into the annular groove at the upper end of the valve stem; The air valve spring is fitted on the outside of the upper valve stem, with its lower end supported on the shoulder of the air valve guide and its upper end pressing against the end face of the rotary valve. The rotary valve is installed between the locking clamp and the upper end of the valve spring, and is connected to the upper valve stem through a fitting.

7. The internal combustion engine exhaust valve mechanism according to claim 6, characterized in that, The valve body and the upper valve stem are integrally formed or fixed by welding.

8. The internal combustion engine exhaust valve mechanism according to claim 6, characterized in that, The upper valve stem, the valve body, and the valve ring constitute the main body of the exhaust valve. The lower part of the valve body is designed with radial and axial cooling holes. The lower outer periphery of the valve body is cut off in a ring. The cut area near the bottom of the valve disc is designed with evenly distributed radial cooling holes. The cut area near the arc area of ​​the valve disc is designed with radially inclined cooling holes. The area near the intersection of the valve disc and the valve stem is partially cut off in a ring.

9. The internal combustion engine valve mechanism according to claim 6, characterized in that, The shoulder of the valve guide is uniformly designed with multiple oblique drill holes and annular grooves, and the cylinder head is designed with drill holes and grooves that are connected to each other, which can deliver cooling air to the exhaust valve.

10. The internal combustion engine valve mechanism according to claim 6, characterized in that, The cylinder head and the valve guide are designed with cooling air channels to deliver cooling air to the exhaust valve.

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