Valve guide pipe and cylinder cover

Abstract

The utility model discloses a valve guide pipe and a cylinder cover, comprising a valve guide pipe body provided with a valve guide pipe inner cavity; the first oil seal part and the second oil seal part are arranged at the two ends of the valve guide pipe inner cavity respectively, and an oil filling cavity filled with lubricating oil is formed in the area, between the first oil seal part and the second oil seal part, of the valve guide pipe inner cavity. The valve guide pipe body is filled with the lubricating oil, so that the valve guide pipe has a continuous lubricating function in the process of guiding a valve rod, friction and abrasion of the valve rod are reduced, the guiding precision is improved, and the service life is prolonged. And the valve rod can move more smoothly along the inner cavity of the valve guide pipe due to the comprehensive filling of the lubricating oil, so that the running resistance is effectively reduced. Lubricating oil can be prevented from overflowing out of the oil filling cavity under the action of high pressure through the first oil sealing piece and the second oil sealing piece, stability of the lubricating oil in the valve guide pipe body is guaranteed, and the sealing performance and the use efficiency of the lubricating oil are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, and more specifically, to a valve guide and a cylinder head. Background Art

[0002] In the existing engine valve train system, the valve stem is pushed by a driving mechanism to move up and down linearly in the valve guide. It is necessary to ensure that the valve stem moves flexibly in the valve guide to ensure the normal intake and exhaust operations of the engine.

[0003] Insufficient lubrication during the up and down movement of the valve stem will cause wear and adhesion of the valve guide, further leading to wear of the cylinder head seat ring and valve ablation, affecting the performance and service life of the engine. Therefore, a lubrication solution is usually added between the valve stem and the valve guide.

[0004] Currently, the commonly used lubrication solutions mainly rely on the penetration of lubricating oil or the addition of oil grooves inside the guide to achieve the lubrication function. Whether it is the penetration solution or the oil film solution, the amount of lubricating oil that can adhere to the inner wall of the valve guide is relatively small. Due to the insufficient amount of lubricating oil, the lubrication effect is limited. When the lubricating oil volatilizes at high temperature, it is easy to lose the lubrication effect and cause dry friction.

[0005] Therefore, how to improve the lubrication effect, reduce the friction and wear between the valve guide and the valve stem, and improve the guiding accuracy and service life is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0006] In view of this, an object of the utility model is to provide a valve guide to improve the lubrication effect, reduce the friction and wear between the valve guide and the valve stem, and improve the guiding accuracy and service life;

[0007] Another object of the utility model is to provide a cylinder head with the above valve guide.

[0008] To achieve the above objects, the utility model provides the following technical solutions:

[0009] A valve guide, comprising:

[0010] A valve guide body having a valve guide inner cavity for cooperating with a valve stem;

[0011] An oil seal assembly, the oil seal assembly at least including a first oil seal and a second oil seal. The first oil seal is arranged at the first end of the valve guide inner cavity, and the second oil seal is arranged at the second end of the valve guide inner cavity. A filling cavity filled with lubricating oil is formed in the area between the first oil seal and the second oil seal in the valve guide inner cavity.

[0012] Optionally, in the above valve guide, the outer rings of the first oil seal and the second oil seal are sealingly fitted with the valve guide body;

[0013] The inner rings of the first oil seal and the second oil seal are used for sealingly fitting with the valve stem.

[0014] Optionally, in the above valve guide, a first annular groove and a second annular groove are provided on the wall of the inner cavity of the valve guide;

[0015] The outer ring of the first oil seal is fitted in the first annular groove, and the outer ring of the second oil seal is fitted in the second annular groove.

[0016] Optionally, in the above valve guide, the first oil seal is one or a plurality arranged at intervals; and / or,

[0017] The second oil seal is one or a plurality arranged at intervals.

[0018] Optionally, in the above valve guide, the first oil seal is a plurality, and in the direction away from the second oil seal, the acting force of each first oil seal on the valve stem gradually increases; and / or,

[0019] The second oil seal is a plurality, and in the direction away from the first oil seal, the acting force of each second oil seal on the valve stem gradually increases.

[0020] Optionally, in the above valve guide, an oil storage groove is provided on the inner wall of the oil filling cavity.

[0021] Optionally, in the above valve guide, the first oil seal is arranged at the upper end of the inner cavity of the valve guide, and the second oil seal is arranged at the lower end of the inner cavity of the valve guide;

[0022] An insulation device is further provided in the inner cavity of the valve guide, and the insulation device is located below the second oil seal.

[0023] Optionally, in the above valve guide, the insulation device includes at least one graphite ring, and the inner ring of the graphite ring is guidingly fitted with the valve stem.

[0024] Optionally, in the above valve guide, a third annular groove is provided on the wall of the inner cavity of the valve guide, and the outer ring of the graphite ring is fitted in the third annular groove.

[0025] The valve guide provided by the present utility model is provided with a first oil seal member and a second oil seal member at both ends of the inner cavity of the valve guide, and an oil filling cavity is formed between the first oil seal member and the second oil seal member. During use, the oil filling cavity is filled with lubricating oil, and the first oil seal member and the second oil seal member are used to seal and hold the lubricating oil in the oil filling cavity. The present utility model fills the inside of the valve guide body with lubricating oil, ensuring that the valve guide has a continuous lubricating effect during the process of guiding the valve stem, thereby reducing the friction and wear of the valve stem, improving the guiding accuracy and service life. The full filling of the lubricating oil also makes the movement of the valve stem along the inner cavity of the valve guide smoother, effectively reducing the operating resistance. In order to prevent the overflow of the lubricating oil, a first oil seal member and a second oil seal member are respectively provided at both ends of the inner cavity of the valve guide. To prevent the lubricating oil from overflowing from the oil filling cavity under high pressure, ensuring the stability of the lubricating oil inside the valve guide body, enhancing the sealing property and use efficiency of the lubricating oil. The design of this double oil seal effectively improves the sealing performance of the valve guide, ensuring the stability and reliability of the lubricating system.

[0026] A cylinder head, comprising:

[0027] A cylinder head body;

[0028] A valve guide, disposed on the cylinder head body, and the valve guide is the valve guide as described in any one of the above.

[0029] The cylinder head provided by the present utility model has all the technical effects of the above valve guide due to the presence of the above valve guide, and will not be elaborated herein again. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a cross-sectional view of the valve guide disclosed in the embodiment of the present utility model.

[0032] The meanings of the various reference numerals in the drawings are as follows:

[0033] 100 - valve guide body; 101 - inner cavity of valve guide; 102 - first annular groove; 103 - second annular groove; 104 - third annular groove;

[0034] 200 - oil seal assembly; 201 - first oil seal member; 202 - second oil seal member;

[0035] 300 - heat insulation device. Detailed implementation mode

[0036] The core of the present utility model lies in providing a valve guide to improve the lubrication effect, reduce the friction and wear between the valve guide and the valve stem, and improve the guiding accuracy and service life;

[0037] Another core of the present utility model lies in providing a cylinder head having the above-mentioned valve guide.

[0038] Hereinafter, the embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not limit the content of the utility model described in the claims in any way. In addition, all the contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the utility model described in the claims. It should be noted that for the convenience of description, only the parts related to the utility model are shown in the drawings. Without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0039] The valve guide provides a guiding function for the movement of the valve stem. In order to reduce the wear and movement resistance of the valve stem, lubrication is usually added to the fit between the valve guide and the valve stem. Currently, the lubrication method mainly relies on the penetration of lubricating oil or adding an oil groove inside the valve guide to achieve the lubrication function.

[0040] A small amount of lubricating oil forms an oil film between the valve guide and the valve stem, but the lubrication effect is limited. When the lubricating oil volatilizes at high temperature, it is easy to lose the lubrication effect and cause dry friction. Insufficient lubrication during the up and down movement of the valve will lead to wear and adhesion of the valve guide, further leading to wear of the cylinder head seat ring and valve ablation, affecting the performance and life of the engine. Valve ablation usually occurs at the valve neck, sealing cone surface and disc end face, and the initial manifestation is ablation spots. With the use of the engine, these spots will be eroded by high-temperature gas into deep grooves, thus destroying the sealing performance of the combustion chamber, reducing the compression force, and affecting the normal operation of the engine.

[0041] It can be seen that if the lubrication between the valve guide and the valve stem is insufficient, it will affect components such as the valve guide, valve, and cylinder head seat ring, and ultimately affect the performance and life of the engine, resulting in the engine being unable to operate normally.

[0042] Based on this, the embodiments of the present utility model disclose a valve guide to improve the sealing effect between the valve guide and the valve stem. As Figure 1 shown, the valve guide disclosed in the embodiments of the present utility model includes a valve guide body 100 and an oil seal assembly 200.

[0043] Among them, the valve guide body 100 has a valve guide inner cavity 101 for cooperating with the valve stem. During use, the valve guide body 100 should be installed on the cylinder head. It should be noted that the fixing method of the valve guide body 100 to the cylinder head is not limited in this embodiment, and it can adopt any fixing method commonly used in the prior art, and of course, it also includes the method of being designed as an integral structure with the cylinder head.

[0044] The aperture of the valve guide inner cavity 101 should be designed to be slightly larger than the outer diameter of the valve stem, so that after the valve stem is inserted into the valve guide inner cavity 101, there is a gap between the valve stem and the inner wall of the valve guide inner cavity 101. It can also be understood that the valve guide inner cavity 101 and the valve stem adopt an interference fit method to avoid friction between the valve stem and the valve guide inner cavity 101. At the same time, setting a gap between the two can also be used to accommodate lubricating oil to increase the lubrication effect.

[0045] The oil seal assembly 200 includes at least a first oil seal 201 and a second oil seal 202. It should be noted that the first oil seal 201 and the second oil seal 202 are classified in terms of spatial position. Neither the first oil seal 201 nor the second oil seal 202 is limited to one. Those skilled in the art can select the actual number of the first oil seal 201 and the second oil seal 202 according to requirements and actual application scenarios.

[0046] In addition, it cannot be excluded that those skilled in the art can also set other components between the first oil seal 201 and the second oil seal 202 according to requirements. This component is not limited to guide parts, seal parts, etc.

[0047] The first oil seal 201 is arranged at the first end of the valve guide inner cavity 101, and the second oil seal 202 is arranged at the second end of the valve guide inner cavity 101. That is, in terms of spatial position, one of the first oil seal 201 and the second oil seal 202 is arranged at one end of the valve guide inner cavity 101, and the other is arranged at the other end of the valve guide inner cavity 101.

[0048] It should be noted that one end and the other end of the valve guide inner cavity 101, or the first end and the second end, do not refer to the absolute ends, but refer to the end regions. Those skilled in the art can understand that the closer the arrangement positions of the first oil seal 201 and the second oil seal 202 are to the ends of the valve guide inner cavity 101, the larger the space formed between the two for storing lubricating oil, and the better the lubrication effect.

[0049] An oil-filled cavity filled with lubricating oil is formed in the region between the first oil seal 201 and the second oil seal 202 in the inner cavity 101 of the valve guide. For the valve guide disclosed in this embodiment, when installing the first oil seal 201 and the second oil seal 202, the oil seal at the lower end of the inner cavity 101 of the valve guide can be installed first. Taking the first oil seal 201 installed at the upper end of the inner cavity 101 of the valve guide and the second oil seal 202 installed at the lower end of the inner cavity 101 of the valve guide as an example.

[0050] First, install the second oil seal 202, then insert the top end of the valve stem into the inner cavity 101 of the valve guide from the lower end. After the top end of the valve stem exceeds the second oil seal 202, fill the inner cavity 101 of the valve guide with lubricating oil, then install the first oil seal 201 in the inner cavity 101 of the valve guide, and finally continue to move the top end of the valve stem upward until it exceeds the first oil seal 201 and exits the inner cavity 101 of the valve guide. At this time, the lubricating oil is sealed in the oil-filled cavity between the first oil seal 201 and the second oil seal 202.

[0051] It should be noted that the above installation method is only one of the installation methods. Those skilled in the art can adopt other installation methods and installation sequences according to needs as long as the lubricating oil can be kept in the oil-filled cavity.

[0052] In the valve guide disclosed in the embodiment of the present invention, a first oil seal 201 and a second oil seal 202 are respectively arranged at both ends of the inner cavity 101 of the valve guide, and an oil-filled cavity is formed between the first oil seal 201 and the second oil seal 202. During use, the oil-filled cavity is filled with lubricating oil, and the first oil seal 201 and the second oil seal 202 are used to seal and hold the lubricating oil in the oil-filled cavity.

[0053] The present invention fills the inside of the valve guide body 100 with lubricating oil, ensuring that the valve guide has a continuous lubricating effect during the process of guiding the valve stem, thereby reducing the friction and wear of the valve stem, improving the guiding accuracy and service life. The full filling of the lubricating oil also makes the movement of the valve stem along the inner cavity 101 of the valve guide smoother, effectively reducing the running resistance. In order to prevent the overflow of the lubricating oil, a first oil seal 201 and a second oil seal 202 are respectively arranged at both ends of the inner cavity 101 of the valve guide to prevent the lubricating oil from overflowing from the oil-filled cavity under high pressure, ensuring the stability of the lubricating oil inside the valve guide body 100 and enhancing the sealing property and use efficiency of the lubricating oil. This design of double oil seals effectively improves the sealing performance of the valve guide and ensures the stability and reliability of the lubrication system.

[0054] In a specific embodiment of the present utility model, the outer rings of the first oil seal member 201 and the second oil seal member 202 are in sealing cooperation with the valve guide body 100 to prevent the lubricating oil in the oil filling cavity from overflowing through the gap between the oil seals (the first oil seal member 201 and the second oil seal member 202) and the valve guide body 100.

[0055] The inner rings of the first oil seal member 201 and the second oil seal member 202 are used for sealing cooperation with the valve stem to prevent the lubricating oil in the oil filling cavity from overflowing through the gap between the oil seals (the first oil seal member 201 and the second oil seal member 202) and the valve stem.

[0056] The first oil seal member 201 and the second oil seal member 202 can select the commonly used seals for sealing lubricating oil at present. In this embodiment, the specific structures and materials of the first oil seal member 201 and the second oil seal member 202 are not limited, as long as the static seal with the valve guide body 100 and the dynamic seal with the valve stem can be achieved. However, considering the working environment of the valve guide, the first oil seal member 201 and the second oil seal member 202 can be made of high-temperature resistant materials, which have higher temperature stability and longer service life.

[0057] Those skilled in the art can understand that the first oil seal member 201 and the second oil seal member 202 cannot move with the movement of the valve stem and need to be fixed in the inner cavity 101 of the valve guide. In this embodiment, the fixing can be achieved by means of concave-convex cooperation. For example, a first annular groove 102 and a second annular groove 103 are provided on the cavity wall of the inner cavity 101 of the valve guide.

[0058] The outer ring of the first oil seal member 201 is fitted into the first annular groove 102, and the outer ring of the second oil seal member 202 is fitted into the second annular groove 103. During installation, the first oil seal member 201 and the second oil seal member 202 can be compressed to deform them, and then pressed into the inner cavity 101 of the valve guide until they slide into the corresponding annular grooves respectively (the first oil seal member 201 slides into the first annular groove 102, and the second oil seal member 202 slides into the second annular groove 103).

[0059] During the movement of the valve stem, a frictional force is generated between the valve stem and the first oil seal member 201 and the second oil seal member 202. This frictional force will form a thrust on the first oil seal member 201 and the second oil seal member 202 in the moving direction, so that the first oil seal member 201 and the second oil seal member 202 have a tendency to move with the valve stem. Since in this embodiment, the first oil seal member 201 and the second oil seal member 202 are embedded in the corresponding annular grooves, the groove walls of the first annular groove 102 and the second annular groove 103 can limit the first oil seal member 201 and the second oil seal member 202, preventing the first oil seal member 201 and the second oil seal member 202 from moving axially along the inner cavity 101 of the valve guide, and improving the installation stability of the first oil seal member 201 and the second oil seal member 202.

[0060] It should be noted that the deeper the depths of the first annular groove 102 and the second annular groove 103 are, the better the limiting effect on the first oil seal 201 and the second oil seal 202. However, in order to enable the inner rings of the first oil seal 201 and the second oil seal 202 to protrude from the inner wall of the valve guide cavity 101, the deeper the depths of the first annular groove 102 and the second annular groove 103 are, the greater the widths of the first oil seal 201 and the second oil seal 202 need to be. In order to reduce the material consumption of the first oil seal 201 and the second oil seal 202, the depths of the first annular groove 102 and the second annular groove 103 can be obtained through experiments.

[0061] In addition, limiting ribs can also be provided in the valve guide cavity 101, and the first oil seal 201 and the second oil seal 202 are respectively installed between the two limiting ribs, and the movement of the first oil seal 201 and the second oil seal 202 is restricted by the two limiting ribs. Annular grooves can also be provided on the outer peripheral surfaces of the first oil seal 201 and the second oil seal 202, and ribs matching the annular grooves on the first oil seal 201 and the second oil seal 202 are provided on the valve guide cavity 101. As long as the axial limiting of the first oil seal 201 and the second oil seal 202 can be achieved, the specific limiting method is not limited in this embodiment.

[0062] In a specific embodiment of the present invention, the first oil seal 201 can be one or multiple arranged at intervals; correspondingly, the second oil seal 202 can be one or multiple arranged at intervals. Taking the first oil seal 201 being located at the upper end of the valve guide body 100 in the use state and the second oil seal 202 being located at the lower end of the valve guide body 100 as an example, the more the number of the first oil seals 201, the better the sealing effect between the upper end of the valve guide body 100 and the valve stem, and the more the number of the second oil seals 202, the better the sealing effect between the lower end of the valve guide body 100 and the valve stem. Those skilled in the art can select the number of the first oil seal 201 and the second oil seal 202 according to the sealing requirements and the balance between the sealing and the movement resistance of the valve stem. Those skilled in the art can understand that usually, only one first oil seal 201 and one second oil seal 202 are provided, which can also meet the sealing requirements for lubricating oil.

[0063] Further, when multiple first oil seal members 201 and second oil seal members 202 are provided, in the direction away from the second oil seal member 202, the acting force of each first oil seal member 201 on the valve stem gradually increases. Those skilled in the art can understand that the acting force of the first oil seal member 201 on the valve stem is related to the sealing effect. The greater the acting force, the better the sealing effect brought by it when the first oil seal member 201 remains unchanged. On the contrary, the smaller the acting force, the worse the sealing effect. In this embodiment, the sealing effects of the first oil seal members 201 are designed to be different, that is, the closer to the end, the better the sealing effect of the first oil seal member 201. In this embodiment, by differentiating the sealing effects of the first oil seal members 201 in the direction away from the second oil seal member 202, on the basis of ensuring the sealing effect, it is possible to prevent all the first oil seal members 201 from having a large acting force on the valve stem, resulting in a large frictional force and a large moving resistance problem.

[0064] Even if there is a slight leakage in the first oil seal member 201 near the middle of the valve guide body 100, since the leakage amount is small, as the sealing effect of the first oil seal member 201 downstream (the first oil seal member 201 near the middle of the valve guide body 100 is the upstream, and the first oil seal member 201 near the end of the valve guide body 100 is the downstream) gradually increases, the leakage of lubricating oil can be completely avoided. Moreover, because the upstream first oil seal member 201 has a small leakage amount even if there is leakage, the downstream first oil seal member 201 only needs to seal the small amount of leaked lubricating oil, and the sealing requirement is relatively low. When multiple first oil seal members 201 are provided, the sealing requirement for the first oil seal member 201 with the best sealing effect (i.e., the first oil seal member 201 located at the end) is also lower than the sealing requirement for only one first oil seal member 201.

[0065] Correspondingly, in the direction away from the first oil seal member 201, the acting force of each second oil seal member 202 on the valve stem gradually increases. Those skilled in the art can understand that the acting force of the second oil seal member 202 on the valve stem is related to the sealing effect. The greater the acting force, the better the sealing effect brought by it when the second oil seal member 202 remains unchanged. On the contrary, the smaller the acting force, the worse the sealing effect. In this embodiment, the sealing effects of the second oil seal members 202 are designed to be different, that is, the closer to the end, the better the sealing effect of the second oil seal member 202. In this embodiment, by differentiating the sealing effects of the second oil seal members 202 in the direction away from the first oil seal member 201, on the basis of ensuring the sealing effect, it is possible to prevent all the second oil seal members 202 from having a large acting force on the valve stem, resulting in a large frictional force and a large moving resistance problem.

[0066] Even if there is a slight leakage in the second oil seal 202 near the middle of the valve guide body 100, since the leakage amount is small, as the sealing effect of the second oil seal 202 downstream (the second oil seal 202 near the middle of the valve guide body 100 is the upstream, and the second oil seal 202 near the end of the valve guide body 100 is the downstream) gradually increases, the leakage of lubricating oil can be completely avoided. Moreover, even if there is leakage in the second oil seal 202 upstream, but the leakage amount is small, so the second oil seal 202 downstream only needs to seal a small amount of leaked lubricating oil, and the sealing requirement is relatively low. When multiple second oil seals 202 are provided, the sealing requirement for the second oil seal 202 with the best sealing effect (i.e., the second oil seal 202 located at the end) is also lower than the sealing requirement for only one second oil seal 202.

[0067] In order to increase the oil storage capacity of the oil filling cavity, oil storage grooves can be opened on the inner wall of the oil filling cavity to increase the volume of the oil filling cavity. It should be noted that since the present utility model has a relatively good sealing effect and the risk of lubricating oil leakage in the oil filling cavity is low, the oil storage grooves may not be opened either.

[0068] In the above embodiment, although the valve guide is provided with the first oil seal 201 and the second oil seal 202 to prevent lubricating oil leakage, the durability of the materials of the first oil seal 201 and the second oil seal 202 at high temperatures is still limited, and there is a risk of aging and failure.

[0069] Based on this, in a specific embodiment of the present utility model, the first oil seal 201 is arranged at the upper end of the inner cavity 101 of the valve guide, and the second oil seal 202 is arranged at the lower end of the inner cavity 101 of the valve guide. An insulating device 300 is also arranged in the inner cavity 101 of the valve guide, and the insulating device 300 is located below the second oil seal 202. Specifically, the insulating device 300 may include at least one graphite ring, and the inner ring of the graphite ring is in guiding fit with the valve stem.

[0070] In addition, the insulating device 300 can also be prepared from other materials and is not limited to graphite. As long as it can insulate heat.

[0071] The graphite ring has excellent heat insulation performance and can effectively reduce the temperature of the lower part of the valve guide body 100, thereby preventing the softening or failure of the materials of the first oil seal 201 and the second oil seal 202 caused by high temperature; the wear-resistant graphite ring firmly binds the valve stem and the valve guide body 100 together to prevent the valve from deviating from the moving direction. Adding the insulating device 300 in this embodiment not only extends the service life of the first oil seal 201 and the second oil seal 202, but also restricts the moving direction of the valve, improving the high-temperature resistance performance and guiding performance of the valve guide.

[0072] To facilitate the installation of the graphite ring, a third ring groove 104 is provided on the inner wall of the valve guide cavity 101, and the outer ring of the graphite ring is fitted into the third ring groove 104. When installing the graphite ring, the temperature of the valve guide body 100 can be increased to make it expand by heat, so as to facilitate the embedding of the graphite ring into the third ring groove 104. After the valve guide body 100 cools down, the graphite ring and the valve guide body 100 can maintain a relatively reliable fixation. It should be noted that other methods can also be used to install the graphite ring, not limited to the installation method disclosed above, and those skilled in the art can select the corresponding installation method according to requirements.

[0073] The present invention combines lubricating oil filling, double oil seal and graphite ring heat insulation and guiding technologies in a valve guide. By comprehensively applying multiple technical elements, a comprehensively optimized valve guide is formed. Such a design not only improves the lubrication effect of the valve guide, but also can solve multiple problems in traditional technologies, such as insufficient lubrication, oil seal failure, valve eccentric wear and high temperature influence, thereby improving the overall performance and durability of the valve guide.

[0074] The embodiment of the present utility model also discloses a cylinder head, which includes a cylinder head body and a valve guide provided on the cylinder head body, and the valve guide is the valve guide disclosed in the above embodiment. The cylinder head disclosed in the embodiment of the present utility model has all the technical effects of the above valve guide due to the presence of the above valve guide, and will not be elaborated herein.

[0075] As shown in the present application and the claims, unless the context clearly indicates an exception, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements. An element defined by the statement "comprising one..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0076] In the description of the present application, unless otherwise clearly defined, words such as "set", "installed", "connected" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.

[0077] The various embodiments in this specification are described in a progressive manner, and the key points of each embodiment are the differences from other embodiments. The same and similar parts among the various embodiments can be referred to each other.

[0078] In this article, specific examples are used to elaborate on the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A valve guide, characterized in that: include: A valve guide body (100), wherein the valve guide body (100) has a valve guide inner cavity (101) for cooperating with a valve stem; An oil seal assembly (200), the oil seal assembly (200) comprising at least a first oil seal (201) and a second oil seal (202), the first oil seal (201) being arranged at a first end of an inner cavity (101) of the valve guide, the second oil seal (202) being arranged at a second end of an inner cavity (101) of the valve guide, the inner cavity (101) of the valve guide forming an oil-filled cavity filled with lubricating oil in a region between the first oil seal (201) and the second oil seal (202).

2. The valve guide according to claim 1, characterized in that The outer rings of the first oil seal (201) and the second oil seal (202) are in sealing cooperation with the valve guide body (100); The inner rings of the first oil seal (201) and the second oil seal (202) are used for sealing with the valve stem.

3. The valve guide according to claim 1, characterized in that A first annular groove (102) and a second annular groove (103) are provided on the cavity wall of the inner cavity (101) of the valve guide; The outer ring of the first oil seal (201) is embedded in the first annular groove (102), and the outer ring of the second oil seal (202) is embedded in the second annular groove (103).

4. The valve guide according to claim 1, characterized in that The first oil seal (201) is one, or a plurality of first oil seals arranged at intervals; and / or, The second oil seal (202) is one or a plurality of second oil seals arranged at intervals.

5. The valve guide according to claim 4, characterized in that There are a plurality of first oil seals (201), and in a direction away from the second oil seal (202), the force exerted by each of the first oil seals (201) on the valve stem gradually increases; and / or, There are a plurality of second oil seals (202), and in a direction away from the first oil seal (201), the force exerted by each second oil seal (202) on the valve stem gradually increases.

6. The valve guide according to claim 1, wherein: An oil storage groove is provided on the inner wall of the oil filling cavity.

7. The valve guide according to any one of claims 1 to 6, characterized in that: The first oil seal (201) is arranged at the upper end of the valve guide inner cavity (101), and the second oil seal (202) is arranged at the lower end of the valve guide inner cavity (101); A heat insulating device (300) is also provided in the inner cavity (101) of the valve guide, and the heat insulating device (300) is located at the lower side of the second oil seal (202).

8. The valve guide according to claim 7, characterized in that The heat insulation device (300) comprises at least one graphite ring, the inner ring of the graphite ring being matched with the valve stem guide.

9. The valve guide according to claim 8, characterized in that A third annular groove (104) is provided on the cavity wall of the inner cavity (101) of the valve guide, and the outer ring of the graphite ring is embedded in the third annular groove (104).

10. A cylinder head, characterized in that: include: Cylinder head body; A valve guide is arranged on the cylinder head body, and the valve guide is the valve guide as described in any one of claims 1-9.

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