Engine valve mechanism

Abstract

The utility model discloses an engine valve mechanism, which relates to the technical field of motorcycles, and comprises a cylinder head, an air passage, a valve guide pipe, a valve rod and a valve spring, the bottom of the valve spring is movably sleeved on the valve guide pipe, the valve spring is connected with a rod part, and the valve rod moves up and down in the valve guide pipe. The valve spring can do reciprocating motion of compression and rebounding, the valve spring can rotate and generate rotating force in the reciprocating motion process, the rotating force acts on the valve rod to enable the valve rod to rotate, friction is generated between the umbrella part and the air channel, and carbon deposition on the side, facing the air channel, of the umbrella part is scraped away. According to the utility model, carbon deposition is prevented from being accumulated on the umbrella part of the valve rod, the sealing performance of the air passage is ensured, the pressure in the cylinder is prevented from being reduced, and the engine performance is prevented from being influenced.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle technology, and in particular to an engine valve mechanism. Background Technology

[0002] Engine carbon buildup is a common phenomenon. It is the residue produced by the incomplete combustion of fuel or engine oil at high temperatures. If the residue is not discharged with the exhaust gas in time, it will accumulate in the internal parts of the engine, such as the intake manifold, cylinder head combustion chamber, piston top, cylinder wall, etc., which will cause problems such as decreased engine performance, difficulty in starting, increased fuel consumption and deterioration of exhaust emissions.

[0003] The main adverse effects of existing carbon deposits on valve mechanisms are: carbon deposits accumulate on the valve stem umbrella, thereby affecting the sealing performance of the intake passage, leading to a drop in cylinder pressure and affecting engine performance. Utility Model Content

[0004] The purpose of this invention is to provide an engine valve mechanism that can self-clean carbon deposits on the valve stem umbrella and prevent carbon deposits from accumulating in the umbrella.

[0005] To achieve the above objectives, the solution of this utility model is as follows:

[0006] An engine valve mechanism includes a cylinder head, within which are disposed an air passage, a valve guide, and a valve stem. The valve stem includes a stem portion and a canopy portion, with the canopy portion located at the bottom end of the stem portion. The valve guide extends into the air passage, and the stem portion passes through the valve guide and can move up and down within the valve guide. When the stem portion moves upward, it causes the canopy portion to move upward, blocking the air passage. When the stem portion moves downward, it causes the canopy portion to move downward, opening the air passage. The mechanism also includes a valve spring, the bottom of which is movably fitted onto the valve guide and is also connected to the stem portion. When the valve stem moves up and down within the valve guide, the valve spring performs a reciprocating compression and rebound motion. During this reciprocating motion, the valve spring can rotate and generate rotational force. This rotational force acts on the valve stem, causing it to rotate and generate friction between the canopy portion and the air passage, thereby scraping away carbon deposits on the side of the canopy portion facing the air passage.

[0007] Furthermore, the inner wall and bottom wall of the valve guide form an acute angle, thereby forming an inwardly protruding scraping section at the junction of the inner wall and bottom wall of the valve guide. The scraping section is used to scrape off carbon deposits on the valve stem when it moves upward.

[0008] Furthermore, it also includes at least one spring washer, which is fitted onto the valve guide and placed under the bottom of the valve spring, and each spring washer has an oil film formed by engine oil.

[0009] Furthermore, the spring washer has two spring washers, and both spring washers have an oil film formed by machine oil.

[0010] Furthermore, the pole is rod-shaped, the umbrella part is formed by radial expansion from the bottom of the pole, and the upper surface of the umbrella part is conical.

[0011] Furthermore, the air passage includes an exhaust passage and an intake passage, with two valve guides leading to the intake and exhaust passages respectively. Each of the intake and exhaust passages is equipped with a valve stem for blocking or opening the intake and exhaust passages.

[0012] After adopting the above solution, the beneficial effects of this utility model are as follows:

[0013] (1) The valve spring of this utility model rotates and generates rotational force during the reciprocating action of compression and rebound. The rotational force acts on the valve stem and causes the valve stem to rotate, so that the umbrella part and the air passage rub against each other, scraping off the carbon deposits on the side of the umbrella part facing the air passage, thereby avoiding the accumulation of carbon deposits on the umbrella part of the valve stem, ensuring the sealing performance of the air passage, preventing the cylinder pressure from dropping, and avoiding affecting the engine performance.

[0014] (2) The present invention also bends the bottom of the inner wall of the valve guide inward so that the inner wall and the bottom wall of the valve guide form an acute angle, thereby forming an inwardly protruding scraping part at the connection between the inner wall and the bottom wall of the valve guide. The scraping part is used to scrape off carbon deposits on the valve stem when the valve stem moves upward. Therefore, the present invention can also self-clean carbon deposits on the valve stem, reduce the accumulation of carbon deposits in the valve guide, reduce the resistance of valve stem movement, and prevent the opening and closing of the air passage from becoming sluggish. Attached Figure Description

[0015] Figure 1 This is an exploded view of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the cylinder head structure of this utility model;

[0017] Figure 3 yes Figure 2 Enlarged view of part A;

[0018] Figure 4 This is a diagram showing the assembly of the air passage, valve guide, valve stem, valve spring, and spring washer of this utility model.

[0019] Figure 5 yes Figure 4 Enlarged view of part B.

[0020] Label Explanation:

[0021] 1. Cylinder head; 10. Air passage; 11. Valve seat; 20. Valve guide; 21. Scraper; 30. Valve stem; 31. Stem; 32. Umbrella; 40. Valve spring; 50. Spring washer; 60. Valve lock clip; 70. Valve bearing plate. Detailed Implementation

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 5 As shown, this embodiment provides an engine valve mechanism, including a cylinder head 1. The cylinder head 1 contains an air passage 10, a valve guide 20, and a valve stem 30. The valve stem 30 includes a stem portion 31 and a canopy portion 32. The canopy portion 32 is located at the bottom end of the stem portion 31. The valve guide 20 leads into the air passage 10. The stem portion 31 passes through the valve guide 20 and can move up and down within the valve guide 20. When the stem portion 31 moves upward, it causes the canopy portion 32 to move upward, blocking the air passage 10. When the stem portion 31 moves downward, it causes the canopy portion 32 to move downward, opening the air passage. The air passage 10 includes a valve spring 40. The bottom of the valve spring 40 is movably sleeved on the valve guide 20, and the valve spring 40 is also connected to the stem 31. When the valve stem 30 moves up and down in the valve guide 20, the valve spring 40 will perform a reciprocating compression and rebound action. During the reciprocating action, the valve spring 40 can rotate and generate rotational force. The rotational force acts on the valve stem 30, thereby causing the valve stem 30 to rotate, so that the umbrella part 32 and the air passage 10 will rub against each other to scrape off the carbon deposits on the side of the umbrella part 32 facing the air passage 10.

[0024] Specifically, the up-and-down movement of the valve stem 30 within the valve guide 20 is due to the action of the cam and rocker arm. The reciprocating motion of the valve spring 40 in compression and rebound is also due to the action of the cam and rocker arm. This is existing technology and will not be elaborated on here. It can be understood that the cam and rocker arm drive the valve stem 30 to move downward, compressing the valve spring 40, and the cam and rocker arm drive the valve stem 30 to move upward, causing the valve spring 40 to rebound.

[0025] It is understandable that the valve spring 40 can rotate during the compression and rebound reciprocating motion because of the torsional torque. When the valve spring 40 is compressed, the spiral shape of the valve spring 40 and the rocker arm force application point are the sources of the torsional torque. Because each spiral of the valve spring 40 is subjected to different pressures, a relative torsional force is generated between the spirals. This torsional torque causes the valve spring 40 to rotate during the compression and rebound process. Since the valve spring 40 and the valve stem 30 are connected, the rotational force can act on the valve stem 30. Since the valve stem 30 is movable, it can rotate. It can be understood that the rotation of the valve spring 40 refers to its rotation around its central axis.

[0026] This invention utilizes the rotation of the valve spring 40 during its reciprocating compression and rebound motion to generate rotational force. This rotational force acts on the valve stem 30, causing it to rotate and generate friction between the umbrella part 32 and the air passage 10. This scrapes away carbon deposits on the side of the umbrella part 32 facing the air passage 10, thereby preventing carbon buildup on the umbrella part 32 of the valve stem 30, ensuring the sealing performance of the air passage 10, preventing a drop in cylinder pressure, and avoiding any impact on engine performance.

[0027] Specifically, the umbrella part 32 and the pole part 31 are integrally connected.

[0028] Furthermore, the inner wall and bottom wall of the valve guide 20 form an acute angle, thereby forming an inwardly protruding scraping part 21 at the connection between the inner wall and bottom wall of the valve guide 20. The scraping part 21 is used to scrape off carbon deposits on the valve stem 31 when the valve stem 30 moves upward.

[0029] This invention features an inwardly curved inner wall of the valve guide 20, creating an acute angle between the inner wall and bottom wall. This forms an inwardly protruding scraping portion 21 at the junction of the inner wall and bottom wall of the valve guide 20. The scraping portion 21 is used to scrape off carbon deposits on the stem portion 31 when the valve stem 30 moves upward. Therefore, this invention can also self-clean carbon deposits on the stem portion 31 of the valve stem 30, reducing the accumulation of carbon deposits in the valve guide 20, reducing the resistance to the movement of the valve stem 30, and preventing the opening and closing of the air passage 10 from becoming sluggish.

[0030] Furthermore, it also includes at least one spring washer 50, which is sleeved on the valve guide 20 and placed under the bottom of the valve spring 40, and each spring washer 50 has an oil film formed by engine oil.

[0031] Preferably, there are two spring washers 50, and both spring washers 50 have an oil film formed by engine oil. It can be understood that by placing two spring washers 50 at the bottom of the valve spring 40 and forming an oil film on the spring washers 50 for lubrication, the friction between the bottom of the valve spring 40 and the valve guide 20 is reduced, thereby reducing the resistance to the rotation of the valve spring 40, making the valve spring 40 easier to rotate, so that the valve stem 30 can rotate to a greater extent, thereby improving the self-cleaning ability of the valve stem 30 umbrella 32.

[0032] Understandably, with only one spring washer 50, the spring washer 50 directly contacts the part of the valve guide 20 that supports the valve spring 40, resulting in greater friction. Since the bottom of the valve spring 40 contacts the spring washer 50, some of this friction is transferred to the valve spring 40, creating resistance to its rotation. This reduces the rotational force generated by the valve spring 40, thus reducing the rotational force exerted by the valve spring 40 on the valve stem 30. Consequently, the degree of rotation of the valve stem 30 decreases, leading to poorer self-cleaning of the umbrella part 32, although a self-cleaning effect can still be achieved. However, with two spring washers 50... The lower spring washer 50 and the part of the valve guide 20 that receives the valve spring 40 are in contact, while the upper spring washer 50 is placed on top of the lower spring washer 50. There is also an oil film between the two. The bottom of the valve spring 40 and the upper spring washer 50 are in contact. Even if the friction between the lower spring washer 50 and the part of the valve guide 20 that receives the valve spring 40 is large, it will only cause the lower spring washer 50 and the upper washer to rotate relative to each other, and will not be transmitted to the valve spring 40. It will not affect the rotation of the valve spring 40, nor will it affect the magnitude of the rotational force acting on the valve stem 30. As a result, the self-cleaning effect of the umbrella part 32 is better than the cleaning effect when there is only one spring washer 50.

[0033] Furthermore, the top of the rod 31 and the top of the valve spring 40 are fixedly connected by the valve lock clip 60 and the valve bearing plate 70. Specifically, the method of fixing the top of the valve spring 40 to the rod 31 by the valve lock clip 60 and the valve bearing plate 70 is existing technology and will not be described in detail here.

[0034] Specifically, the air passage 10 is provided with a valve seat ring 11 on the side near the umbrella part 32. The valve seat ring 11 is used to increase the sealing performance of the valve stem 30 and the umbrella part 32.

[0035] Specifically, the rod portion 31 is rod-shaped, the umbrella portion 32 is formed by radial expansion from the bottom of the rod portion 31, and the upper surface of the umbrella portion is conical.

[0036] Furthermore, the air passage 10 includes an exhaust passage and an intake passage, with two valve guides 20 respectively leading into the intake passage and the exhaust passage. A valve stem 30 is provided in both the intake passage and the exhaust passage for blocking or opening the intake passage and the exhaust passage.

[0037] The directional terms used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0038] The above description is only a preferred embodiment of this utility model and is not intended to limit the design of this case. All equivalent changes made based on the key design of this case shall fall within the protection scope of this case.

Claims

1. An engine valve mechanism, comprising a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a 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head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a cylinder head, a 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An engine valve train as claimed in claim 1, characterised in that: ​ 3. An engine valve train as claimed in claim 1, characterized in that: ​ 4. An engine valve train as claimed in claim 3, characterised in that: ​ 5. An engine valve train as claimed in claim 1, characterized in that: ​ 6. An engine valve train as claimed in claim 1, characterized in that: ​

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