An engine valve

Abstract

The present invention relates to the technical field of internal combustion engine parts, and specifically discloses an engine valve, which includes a valve seat and a valve stem, wherein the valve seat is used to open or close the intake or exhaust passage of the engine, one end of the valve stem is connected to the valve seat and is used to cooperate with the valve motion actuator, the valve seat includes a smooth first outer wall and a first support body located inside the first outer wall, the valve stem includes a smooth second outer wall and a second support body located inside the second outer wall, and the first support body is a multi-cavity structure. Since the engine valve adopts a multi-cavity structure, the impact load between the engine cylinder and the valve during operation can be reduced, thereby reducing the noise during collision.

Description

Technical Field

[0001] The invention relates to the technical field of internal combustion engine parts, and in particular to an engine valve. Background Art

[0002] Low-speed two-stroke marine engines are the main driving force for global shipping, especially ocean-going shipping. As a key component that has a significant impact on engine performance, valves have harsh working conditions, high design requirements, and typical regional functional requirements. Generally, it is necessary to add processes such as surfacing and rolling to achieve local strengthening. Due to the use of high-strength alloy materials and the use of solid manufacturing, the valves are heavy, which in turn leads to increased impact loads on the exhaust valve seat during operation, increased collision noise, and worsened working conditions of the valves. Summary of the invention

[0003] The purpose of the present invention is to provide an engine valve to solve the problem in the related art that the valve is made of solid material, which makes the valve heavy, thereby increasing the impact load with the engine cylinder body during operation, increasing the collision noise, and worsening the working conditions of the valve.

[0004] The present invention provides an engine valve, which includes a valve seat and a valve stem, wherein the valve seat is used to open or close the intake or exhaust passage of the engine, one end of the valve stem is connected to the valve seat and is used to cooperate with a valve motion actuator, the valve seat includes a smooth first outer wall and a first support body located inside the first outer wall, the valve stem includes a smooth second outer wall and a second support body located inside the second outer wall, and the first support body has a multi-cavity structure.

[0005] As a preferred technical solution for the engine valve, the first support body includes a plurality of first cavity monomers.

[0006] As a preferred technical solution for the engine valve, the first support body includes multiple first support groups, each of the first support groups includes multiple first cavity monomers evenly arranged around the circumference of the valve, and the multiple first support groups are arranged in an axial array along the valve.

[0007] As a preferred technical solution for the engine valve, the second support body has a multi-cavity structure.

[0008] As a preferred technical solution for the engine valve, the second support body includes a plurality of second cavity monomers.

[0009] As a preferred technical solution for the engine valve, the second support body includes multiple second support groups, each of the second support groups includes multiple second cavity monomers evenly arranged around the circumferential direction of the valve, and the multiple second support groups are arranged in an axial array along the valve.

[0010] As a preferred technical solution for the engine valve, a first wear-resistant layer is provided at the place where the first outer wall of the valve seat abuts against the intake or exhaust passage of the engine.

[0011] As a preferred technical solution for the engine valve, the second outer wall of the valve stem is configured as a second wear-resistant layer.

[0012] As a preferred technical solution for the engine valve, a flange is provided at the upper end of the valve stem.

[0013] As a preferred technical solution for the engine valve, the valve seat and the valve stem are integrally formed by additive manufacturing.

[0014] The beneficial effects of the present invention are:

[0015] The present invention provides an engine valve, which includes a valve seat and a valve stem. The valve seat is used to open or close the intake or exhaust passage of the engine. One end of the valve stem is connected to the valve seat and is used to cooperate with the valve motion actuator. The valve seat includes a smooth first outer wall and a first support body located inside the first outer wall. The valve stem includes a smooth second outer wall and a second support body located inside the second outer wall. The first support body is a multi-cavity structure. The engine valve is divided into a valve seat and a valve stem. The valve seat is composed of an internal first support body and a first outer wall wrapped outside the first support body. The valve stem is composed of an internal second support body and a second outer wall wrapped outside the second support body. Since the first support body is a multi-cavity structure, the weight is lighter than that of a valve made of an ordinary solid body. Therefore, the problem that the valve is heavy due to the use of a solid body in the valve operation, which leads to an increase in the impact load with the exhaust valve seat during operation, an increase in collision noise, and a deterioration in the working conditions of the valve can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of an engine valve in an embodiment of the present invention;

[0017] Figure 2 is a cross-sectional schematic diagram of an engine valve in an embodiment of the present invention;

[0018] Figure 3 Schematic cross-sectional view of an engine valve seat in an embodiment of the present invention.

[0019] In the figure:

[0020] 1. valve seat; 11. first support body; 12. first outer wall;

[0021] 2. Valve stem; 21. Second support body; 22. Second outer wall. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] like Figures 1 to 3As shown, this embodiment provides an engine valve, which includes a valve seat 1 and a valve stem 2. The valve seat 1 is used to open or close the intake or exhaust channel of the engine. One end of the valve stem 2 is connected to the valve seat 1 and is used to cooperate with the valve motion actuator. The valve seat 1 includes a smooth first outer wall 12 and a first support body 11 located inside the first outer wall 12. The valve stem 2 includes a smooth second outer wall 22 and a second support body 21 located inside the second outer wall 22. The first support body 11 has a multi-cavity structure. The engine valve is divided into a valve seat 1 and a valve stem 2. The valve seat 1 is composed of an internal first support body 11 and a first outer wall 12 wrapped outside the first support body 11. The valve stem 2 is composed of an internal second support body 21 and a second outer wall 22 wrapped outside the second support body 21. Since the first support body 11 is a multi-cavity structure, the weight is lighter than that of a valve made of ordinary solid. Therefore, during the operation of the valve, the problem of heavy valve caused by the use of solid manufacturing, which in turn leads to increased impact load with the exhaust valve seat during operation, increased collision noise, and worsened working conditions of the valve can be improved.

[0027] Optionally, the first support body 11 includes a plurality of first cavity monomers. In this embodiment, the first support body 11 is composed of first cavity monomers of different shapes, the inner layer of the first support body 11 is composed of a hexagonal columnar cavity, and the outermost layer fixed to the first outer wall 12 is set as a special-shaped cavity according to the shape of the first outer wall 12. In other embodiments, rectangular cavities can also be used, and other cavity shapes can also be used, such as spherical cavities, pentagonal cavities, conical cavities, and other shaped cavities.

[0028] Optionally, the first support body 11 includes a plurality of first support groups, each of which includes a plurality of first cavity monomers evenly arranged around the circumference of the valve, and the plurality of first support groups are arranged in an array along the axial direction and radial direction of the valve. In this embodiment, a plurality of first cavity monomers form a first support group, and the plurality of first support groups are arranged in an array along the axial direction and radial direction of the valve to form the first support body 11. Compared with the traditional solid structure, the first support body 11 solves the problem of heavy mass of the traditional solid structure and can meet the strength requirements of the valve seat 1.

[0029] Optionally, the second support body 21 is a multi-cavity structure. In this embodiment, the second support body 21 is a multi-cavity structure, which can further reduce the weight of the engine valve when the first support body 11 is designed to reduce weight. At the same time, the multi-cavity structure meets the strength requirements of the valve stem 2 while reducing weight.

[0030] Optionally, the second support body 21 includes a plurality of second cavity monomers. In this embodiment, the interior of the second support body 21 is composed of second cavity monomers of different shapes, the interior of the second support body 21 is composed of a hexagonal columnar cavity, and the portion fixed to the second outer wall 22 is configured as a special-shaped cavity according to the shape of the second outer wall 22. In other embodiments, rectangular cavities may be used, or other cavity shapes may be used, such as a spherical cavity, a pentagonal cavity, or a conical cavity.

[0031] Optionally, the second support body 21 includes a plurality of second support groups, each of which includes a plurality of second cavity monomers evenly arranged around the circumference of the valve, and the plurality of second support groups are arranged in an array along the axial direction and radial direction of the valve. In this embodiment, a plurality of second cavity monomers form a second support group, and the plurality of second support groups are arranged in an array along the axial direction and radial direction of the valve. Compared with the traditional solid structure, the second support body 21 solves the problem of heavy mass of the traditional solid structure and can meet the strength requirements of the valve seat 1.

[0032] Optionally, a first wear-resistant layer is provided at the abutment between the first outer wall 12 of the valve seat 1 and the intake or exhaust passage of the engine. In this embodiment, since the first outer wall 12 of the valve seat 1 and the intake or exhaust passage of the engine collide when the valve is working, deformation or wear is very likely to occur at the collision point. Therefore, providing a first wear-resistant layer at the abutment between the first outer wall 12 of the valve seat 1 and the intake or exhaust passage of the engine can effectively reduce the wear and deformation of the collision area between the first outer wall 12 of the valve seat 1 and the intake or exhaust passage of the engine. In this embodiment, the first wear-resistant layer and the valve seat 1 are made by integral molding. In other embodiments, the first wear-resistant layer is manufactured separately from the valve seat 1, and the first outer wall 12 of the valve seat 1 is arranged to be an inwardly concave groove at the joint with the intake or exhaust passage of the engine. The first wear-resistant layer is made of a high-temperature resistant alloy material having wear-resistant and non-deformable properties. The first wear-resistant layer and the groove are detachably connected. When the first wear-resistant layer is worn or deformed due to long-term use and affects the airtightness of the valve, the valve can be reused by replacing the first wear-resistant layer, thereby reducing the replacement cost of parts.

[0033] Optionally, the second outer wall 22 of the valve stem 2 is provided with a second wear-resistant layer. In this embodiment, since there is relative sliding between the valve stem 2 and the intake or exhaust passage of the engine, the valve stem 2 needs to have strong wear resistance, and therefore, the second outer wall 22 of the valve stem 2 is provided with a second wear-resistant layer. In this embodiment, the second wear-resistant layer is made of a hard and wear-resistant material. In other embodiments, the wear resistance of the material can be improved by using additive manufacturing technology and changing processing parameters without changing the material.

[0034] Optionally, a flange is provided at the upper end of the valve stem 2. In this embodiment, the flange serves as a limiter, and the flange is engaged with the valve motion actuator of the engine, which is equivalent to the valve stem 2 being fixedly connected with the valve motion actuator of the engine. In other embodiments, a buckle may be provided at the upper end of the valve stem 2 to engage with the valve motion actuator of the engine, or the valve stem 2 may be directly connected by bolts.

[0035] Preferably, the valve seat 1 and the valve stem 2 are integrally formed by additive manufacturing. In this embodiment, the valve seat 1 and the valve stem 2 are integrally formed by additive manufacturing without affecting the connection strength of the connection between the valve seat 1 and the valve stem 2. Since the first support body 11 and the second support body 21 are multi-cavity structures, traditional processing technology is difficult to achieve, so additive manufacturing can be easily processed. At the same time, additive manufacturing can change the material and processing parameters at any time during processing, so that the wear-resistant layer of the valve stem 2 and the valve seat 1 can be processed by changing the material or changing the processing parameters.

[0036] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An engine valve, characterized in that: The invention comprises a valve seat (1) and a valve stem (2), wherein the valve seat (1) is used to open or close an intake or exhaust passage of an engine, one end of the valve stem (2) is connected to the valve seat (1) and is used to cooperate with a valve motion actuator, the valve seat (1) comprises a smooth first outer wall (12) and a first support body (11) located inside the first outer wall (12), the valve stem (2) comprises a smooth second outer wall (22) and a second support body (21) located inside the second outer wall (22), and the first support body (11) is a multi-cavity structure; The first support body (11) comprises a plurality of first cavity monomers, and the interior of the first support body (11) is composed of the first cavity monomers of different shapes; The first support body (11) comprises a plurality of first support groups, each of the first support groups comprises a plurality of first cavity monomers evenly arranged around the circumference of the valve, and the plurality of first support groups are arranged in an array along the axial direction and radial direction of the valve; The second support body (21) has a multi-cavity structure; The second support body (21) comprises a plurality of second cavity monomers, and the interior of the second support body (21) is composed of the second cavity monomers of different shapes; The second support body (21) comprises a plurality of second support groups, each of which comprises a plurality of second cavity monomers evenly arranged around the circumference of the valve, and the plurality of second support groups are arranged in an axial and radial array along the valve.

2. The engine valve according to claim 1, characterized in that: A first wear-resistant layer is provided at the location where the first outer wall (12) of the valve seat (1) abuts against the intake or exhaust passage of the engine.

3. The engine valve according to claim 1, characterized in that: The second outer wall (22) of the valve stem (2) is provided with a second wear-resistant layer.

4. The engine valve according to claim 1, characterized in that: The upper end of the valve stem (2) is provided with a flange.

5. The engine valve according to claim 1, characterized in that: The valve seat (1) and the valve stem (2) are integrally formed by an additive manufacturing process.

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