Valve guide pipe, valve assembly and cylinder cover assembly

Abstract

The utility model relates to a valve guide pipe, a valve assembly and a cylinder cover assembly, the valve guide pipe is used for being installed on a cylinder cover and is in sliding fit with a valve rod, the outer pipe wall, used for making contact with the cylinder cover, of the valve guide pipe and / or the inner pipe wall, used for making contact with the valve rod, of the valve guide pipe are / is provided with concave parts, and the concave parts communicate with a pipe cavity of the valve guide pipe; the valve guide pipe, the cylinder cover and the valve rod are matched to define an oil storage groove for storing lubricating oil in the concave part, and the oil storage groove storing the lubricating oil is closer to the lower end of the valve guide pipe than an oil seal above the valve guide pipe. Therefore, the lower end of the valve guide pipe can be quickly lubricated when the engine runs for the first time or is restarted after long-term shutdown, so that the purposes of avoiding adhesion of the valve and the valve guide pipe and improving the reliability of the engine are achieved.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a valve guide, valve assembly, and cylinder head assembly. Background Technology

[0002] During engine exhaust valve operation, the valve itself reaches a high temperature and moves at a high speed. Simultaneously, as the valve slides up and down, it exerts lateral force on the valve guide under the influence of gas and mechanical forces. This sliding friction can easily cause wear on the valve guide. Furthermore, the high temperature of the exhaust valve can also cause the lower end of the valve guide to stick to the valve. Therefore, it is essential to have sufficient lubricating oil in the valve guide to ensure adequate lubrication during valve operation and prevent the valve from sticking to the valve guide.

[0003] In existing technologies, such as Figure 1 As shown, lubricating oil enters the space between the valve and the valve guide through an oil seal installed above the valve guide. As the amount of oil leaking into the valve guide increases, and with the sliding action of the valve, the lubricating oil reaches the lower end of the valve guide. During the operation of a diesel engine, heat is mainly concentrated at the lower end of the valve, therefore the lower end of the valve guide and the exhaust valve require faster lubrication. However, in the current design, the lubricating oil cannot quickly reach the lower end of the valve guide when the engine is first started. When the engine is restarted after a long period of inactivity, the lack of rapid lubrication at the lower end of the valve guide also leads to adhesion between the exhaust valve and the valve guide. Summary of the Invention

[0004] The first objective of this invention is to provide a valve guide that can quickly lubricate the lower end of the valve guide during initial engine operation or restart after a long period of inactivity, thereby preventing the valve from sticking to the valve guide and improving engine reliability.

[0005] A second objective of the present invention is to provide a valve assembly including the above-described valve guide and a cylinder head assembly.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A valve guide is provided, which is used to install on a cylinder head and slide in cooperation with a valve stem. The outer tube wall of the valve guide that contacts the cylinder head and / or the inner tube wall of the valve guide that contacts the valve stem are provided with recesses. The recesses are in communication with the lumen of the valve guide. The valve guide, the cylinder head and the valve stem cooperate to form an oil reservoir for storing lubricating oil.

[0008] In an embodiment of the present application, the valve guide comprises at least two coaxially arranged guide portions, and the adjacent two guide portions are spaced apart to form the recess.

[0009] In an embodiment of the present application, the inner wall of one of the adjacent two guide portions near the end connected with the recess is provided with a guide portion, and the guide portion is a tapered surface with a diameter gradually decreasing from the recess to the valve head.

[0010] In an embodiment of the present application, the outer wall of at least one of the adjacent two guide portions near the end connected with the recess is provided with an expansion groove, and the expansion groove is in communication with the recess.

[0011] In an embodiment of the present application, the expansion groove is provided on the outer wall of at least one of the adjacent two guide portions away from the valve head.

[0012] In an embodiment of the present application, the opposite end faces of the adjacent two guide portions are tapered surfaces with a diameter gradually decreasing from the recess to the valve head.

[0013] In an embodiment of the present application, the outer wall of the valve guide in contact with the cylinder head is provided with an annular groove, the bottom of the annular groove is in communication with the lumen of the valve guide through a plurality of through holes, the through holes are uniformly distributed along the circumference of the valve guide, and the annular groove constitutes the recess.

[0014] In an embodiment of the present application, the through holes are arranged at the position where the bottom of the annular groove meets the lower side wall of the annular groove, and the through holes are inclined from the end away from the lumen of the valve guide to the direction of the valve head.

[0015] A valve assembly comprises a valve, a valve guide, a valve seat and a valve spring, and the valve guide is the valve guide according to any one of the above.

[0016] A cylinder head assembly comprises a cylinder head and a valve assembly, and the valve assembly is the valve assembly according to the above.

[0017] As can be seen from the above technical solutions, the present application discloses a valve guide, which is used for being mounted on a cylinder head and being in sliding cooperation with a valve rod, and the outer wall of the valve guide in contact with the cylinder head and / or the inner wall of the valve guide in contact with the valve rod is provided with a recess, the recess is in communication with the lumen of the valve guide, and the valve guide, the cylinder head and the valve rod cooperate to enclose the recess to form an oil storage groove for storing lubricating oil.

[0018] The oil storage groove can store lubricating oil, a small amount of lubricating oil is added in the oil storage groove when the engine is initially installed, and the lubricating oil stored in the oil storage groove quickly enters the lower end of the valve guide under the action of the upward and downward sliding of the valve, lubricates the contact surface between the valve rod and the valve guide, and prevents the adhesion caused by the insufficient lubricating oil under the high temperature of the lower end of the valve guide. When the engine is used again after a long-term shutdown, the lubricating oil stored in the oil storage groove will also quickly lubricate the lower end of the valve guide with the upward and downward sliding of the valve, effectively preventing the adhesion of the exhaust valve and the valve guide. With the continuous leakage of lubricating oil into the valve guide and the valve rod, the oil seal above the valve guide supplements new lubricating oil into the oil storage groove, so that a small amount of lubricating oil is always stored in the oil storage groove.

[0019] It can be seen that in the present application, the oil storage groove storing lubricating oil is closer to the lower end of the valve guide relative to the oil seal above the valve guide, so that the lower end of the valve guide can be quickly lubricated when the engine is initially operated or started again after a long-term shutdown, thereby achieving the purpose of avoiding the adhesion of the valve and the valve guide and improving the reliability of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a sectional view of a cylinder head assembly in the prior art;

[0022] Figure 2 is a sectional view of a cylinder head assembly provided by the first embodiment of the present application;

[0023] Figure 3 is Figure 2 is a local enlarged view of position A in FIG. 5;

[0024] Figure 4 is a sectional view of a cylinder head assembly provided by the second embodiment of the present application;

[0025] Figure 5 is Figure 4 is a local enlarged view of position B in FIG. 7;

[0026] Figure 6 is a sectional view of a cylinder head assembly provided by the third embodiment of the present application;

[0027] Figure 7 As Figure 6 A partial enlarged view at C in the middle;

[0028] Figure 8 A cross-sectional view of a cylinder head assembly provided by a fourth embodiment of the present application;

[0029] Figure 9 As Figure 8 A partial enlarged view at D in the middle;

[0030] Figure 10 A cross-sectional view of a cylinder head assembly provided by a fifth embodiment of the present application;

[0031] Figure 11 As Figure 10 A partial enlarged view at E in the middle.

[0032] In the figure:

[0033] 1 is a valve guide; 101 is a first guide portion; 102 is a second guide portion; 1a is a lower end surface of the first guide portion; 1b is an upper end surface of the second guide portion; 2 is a valve; 201 is a valve stem; 202 is a valve head; 3 is a cylinder head; 4 is an oil reservoir; 5 is a guide portion; 6 is an expansion groove; 7 is an annular groove; 701 is a groove bottom; 702 is a lower groove wall; and 8 is a through hole. DETAILED DESCRIPTION

[0034] One of the cores of the present application is to provide a valve guide, which is designed to enable quick lubrication of the lower end of the valve guide when the engine is initially operated or operated again after a long shutdown, thereby avoiding the problem of adhesion of the valve to the valve guide and improving the reliability of the engine.

[0035] Another core of the present application is to provide a valve assembly and a cylinder head assembly based on the above-mentioned valve guide.

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] Please refer to Figures 2 to 11 , Figure 2 A cross-sectional view of a cylinder head assembly provided by a first embodiment of the present application, Figure 3 As Figure 2 A partial enlarged view at A in the middle, Figure 4 A cross-sectional view of a cylinder head assembly provided by a second embodiment of the present application, Figure 5 AsFigure 4 a local enlarged view at B, Figure 6 a cross-sectional view of a cylinder head assembly according to a third embodiment of the application, Figure 7 a local enlarged view at B, Figure 6 a local enlarged view at C, Figure 8 a cross-sectional view of a cylinder head assembly according to a fourth embodiment of the application, Figure 9 a local enlarged view at C, Figure 8 a local enlarged view at D, Figure 10 a cross-sectional view of a cylinder head assembly according to a fifth embodiment of the application, Figure 11 a local enlarged view at D, Figure 10 a local enlarged view at E.

[0038] A valve guide 1 is disclosed in the embodiments of the application, which is used to be installed on a cylinder head 3 and is in sliding cooperation with a valve rod 201 of a valve 2. The valve 2 is a component installed on the cylinder head 3 and is divided into an intake valve and an exhaust valve, and mainly functions to block a gas passage and control gas exchange of an engine. In an engine intake stroke, the intake valve is opened, and the gas in a gas passage is sucked into a cylinder under the action of pressure to participate in combustion; in an engine exhaust stroke, the exhaust valve is opened, and the exhaust gas in the cylinder after combustion is discharged into an exhaust passage under the action of pressure. Since the exhaust valve directly contacts the gas after combustion, the temperature at the lower end of the exhaust valve is high, and therefore the valve guide 1 in the embodiments of the application is mainly used for the exhaust valve, and of course can also be used for the intake valve, which is not limited herein.

[0039] The valve guide 1 is used to be installed on the cylinder head 3 and is a component for positioning and guiding the valve 2, and is required to provide support for the valve 2 while positioning and guiding, and can bear the lateral force of the valve 2 when the valve 2 is subjected to the lateral force. In addition, the valve guide 1 at the exhaust valve also needs to quickly cool the valve 2.

[0040] In the application, a recess is arranged on an outer pipe wall of the valve guide 1 used to contact the cylinder head 3 and / or an inner pipe wall of the valve guide 1 used to contact the valve rod 201, the recess is recessed from the outer pipe wall of the valve guide 1 to the axis direction of the valve guide 1 along the radial direction of the valve guide 1, so as to ensure that the entire outer pipe wall of the valve guide 1 is not convex, the existing valve guide can be replaced without changing the structure of the cylinder head, the cost is reduced, the recess is in communication with a pipe cavity of the valve guide 1, and the recess is surrounded by the valve guide 1, the cylinder head 3 and the valve rod 201 to form an oil storage groove 4 for storing lubricating oil.

[0041] The valve guide 1 is formed by setting the recessed part to form the oil storage groove 4 closer to the lower end of the valve guide 1 relative to the oil seal above the valve guide 1, the oil storage groove 4 can store lubricating oil, a small amount of lubricating oil is added in the oil storage groove 4 when the engine is initially installed, when the engine is initially operated, the lubricating oil stored here quickly enters the lower end of the valve guide 1 under the action of the up-and-down sliding of the valve 2, lubricates the contact surface of the valve stem 201 and the valve guide 1, and prevents the adhesion caused by the insufficient lubricating oil under the high temperature at the lower end of the valve guide 1. When the engine is used again after a long-term stop, since the oil storage groove 4 stores lubricating oil, the lower end of the valve guide 1 can also be quickly lubricated with the up-and-down sliding of the valve 2, effectively avoiding the adhesion of the exhaust valve and the valve guide 1. As the lubricating oil continuously leaks into the valve guide 1 and the valve stem 201, the oil seal above the valve guide 1 supplements new lubricating oil into the oil storage groove 4, so that a small amount of lubricating oil is always stored in the oil storage groove 4.

[0042] Compared with the prior art, the valve guide 1 provided by the embodiment of the application is provided with the oil storage groove 4 for storing lubricating oil, the oil storage groove 4 is closer to the lower end of the valve guide 1 relative to the oil seal above the valve guide 1, so that the lower end of the valve guide 1 can be quickly lubricated when the engine is initially operated or started again after a long-term stop, thereby achieving the purpose of avoiding the adhesion of the valve 2 and the valve guide 1 and improving the reliability of the engine.

[0043] The recessed part can be formed in various ways, for example, the valve guide 1 comprises at least two coaxially arranged guide pipe parts, the adjacent two guide pipe parts are arranged with a gap to form the recessed part, the recessed part is formed through the gap between the adjacent two guide pipe parts, in an embodiment of the application, as shown in Figure 2 and Figure 3 The valve guide 1 comprises the first guide pipe part 101 and the second guide pipe part 102, the first guide pipe part 101 and the second guide pipe part 102 are arranged with a gap, that is, the lower end surface 1a of the first guide pipe part 101 and the upper end surface 1b of the second guide pipe part 102 form the recessed part, the cylinder head 3, the valve stem 201, the first guide pipe part 101 and the second guide pipe part 102 surround the annular oil storage groove 4.

[0044] In order to make the oil storage groove 4 as close as possible to the lower end of the valve guide 1, the lower end of the valve guide 1 is the end of the valve guide 1 close to the valve head 202 of the valve 2, in the above-mentioned embodiment of the application, as shown in Figure 2 and Figure 3 The length of the second guide pipe part 102 is less than the length of the first guide pipe part 101, so that the oil storage groove 4 is closer to the lower end of the valve guide 1.

[0045] To further optimize the above technical solution and facilitate the introduction of lubricating oil between the friction contact surfaces of the valve guide 1 and the valve stem 201, in a specific embodiment of this application, such as... Figure 4 and Figure 5 As shown, a guide portion 5 is provided on the inner wall of the end of the valve guide 1 that is connected to the recessed portion near the valve head 202 in two adjacent guide portions. The guide portion 5 is a conical surface with a gradually decreasing diameter from the recessed portion to the valve head 202. By providing the guide portion 5, the lubricating oil in the oil reservoir 4 can be more easily and quickly introduced into the friction contact surface between the valve guide 1 and the valve stem 201.

[0046] To increase the capacity of the oil reservoir 4 and enable it to store more lubricating oil, in one embodiment of this application, an expansion groove 6 is provided on the outer wall of at least one end of two adjacent guide sections that connects to the recess. The expansion groove 6 communicates with the recess. Further, an expansion groove 6 is provided on the outer wall of at least one of the two adjacent guide sections that is furthest from the valve head 202. Figure 6 and Figure 7 As shown in the illustrated embodiment, the lower outer wall of the first conduit section 101 and the upper outer wall of the second conduit section 102 are both provided with conical surfaces. This not only increases the volume of the oil reservoir 4, but also serves as a guide when the first conduit section 101 and the second conduit section 102 are assembled to the cylinder head 3, facilitating the installation of the first conduit section 101 and the second conduit section 102.

[0047] To further facilitate the introduction of lubricating oil between the friction contact surfaces of the valve guide 1 and the valve stem 201, the opposing end faces of two adjacent guide sections are tapered surfaces with a gradually decreasing diameter from the recessed portion to the valve head 202. Please refer to [link / reference needed]. Figure 8 and Figure 9 In one embodiment of this application, the lower end face 1a of the first conduit portion 101 and the upper end face 1b of the second conduit portion 102 are both conical surfaces, which makes the oil reservoir 4 form a funnel-like structure, so that the lubricating oil inside always tends to move between the friction contact surface of the valve guide 1 and the valve stem 201.

[0048] Of course, the formation of depressions is not limited to Figures 2 to 9 The form shown is achieved by arranging multiple catheter sections at intervals, such as... Figures 10 to 11 As shown, in another embodiment of this application, the outer wall of the valve guide 1 that contacts the cylinder head 3 is provided with an annular groove 7. The bottom 701 of the annular groove 7 is connected to the lumen of the valve guide 1 through multiple through holes 8. The through holes 8 can be provided in one circle or multiple circles spaced apart along the axial direction of the valve guide 1. Each through hole 8 in the same circle is evenly distributed around the circumference of the valve guide 1. The annular groove 7 forms a recessed part. In this embodiment, the valve guide 1 is still a whole.

[0049] Further optimization of the above technical solutions, such as Figure 11 As shown in the further optimization of the above technical solutions, such as

[0050] The application further provides a valve assembly, which comprises a valve 2, a valve guide pipe 1, a valve 2 seat and a valve spring, wherein the valve guide pipe 1 is the valve guide pipe 1 as described in the above embodiment, and since the valve assembly adopts the valve guide pipe 1 in the above embodiment, the technical effects of the valve assembly are refer to the above embodiment.

[0051] Further, the application further provides a cylinder head assembly, which comprises a cylinder head 3 and a valve assembly, wherein the valve assembly is the valve assembly as described in the above embodiment, and since the valve assembly adopted by the cylinder head assembly comprises the valve guide pipe 1 in the above embodiment, the technical effects of the cylinder head assembly are refer to the above embodiment.

[0052] It should be noted that each of the embodiments in the specification adopts a progressive manner for description, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between each embodiment can be referred to each other.

[0053] The principle and implementation mode of the application are described by applying specific examples in the present application, and the above embodiment is only used to help understand the core idea of the application. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the application, the application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A valve guide for mounting on a cylinder head (3) and in sliding engagement with a valve stem (201), characterized in that The valve guide is provided with a recess in the outer wall in contact with the cylinder head (3) and / or the inner wall in contact with the valve stem (201), the recess being in communication with the lumen of the valve guide, the valve guide, the cylinder head (3) and the valve stem (201) cooperating to enclose the recess as an oil storage groove (4) for storing lubricating oil.

2. The valve guide of claim 1, wherein The valve guide comprises at least two coaxially arranged guide pipe sections, and the recess is formed between the adjacent two guide pipe sections.

3. The valve guide of claim 2, wherein, The inner wall of one of the adjacent two guide pipe sections near the valve head (202) is provided with a guide portion (5) at the end in contact with the recess, the guide portion (5) being a tapered surface with a gradually reduced diameter from the recess to the valve head (202).

4. The valve guide according to claim 2 or 3, characterized in that The outer wall of at least one of the adjacent two guide pipe sections at the end in contact with the recess is provided with an expansion groove (6), the expansion groove (6) being in communication with the recess.

5. The valve guide of claim 4, wherein, The expansion groove (6) is provided at least on the outer wall of one of the adjacent two guide pipe sections away from the valve head (202).

6. The valve guide of claim 3, wherein, The opposite end faces of the adjacent two guide pipe sections are tapered surfaces with a gradually reduced diameter from the recess to the valve head (202).

7. The valve guide of claim 1, wherein The outer wall of the valve guide in contact with the cylinder head (3) is provided with an annular groove (7), the groove bottom (701) of the annular groove (7) being in communication with the lumen of the valve guide through a plurality of through holes (8), each through hole (8) being uniformly distributed along the circumference of the valve guide, and the annular groove (7) constituting the recess.

8. The valve guide of claim 7, wherein, The through holes (8) are arranged at the position where the groove bottom (701) of the annular groove (7) meets the lower groove wall (702) of the annular groove (7), and the through holes (8) are inclined from the end away from the lumen of the valve guide to the direction of the valve head (202).

9. A valve assembly comprising a valve (2), a valve guide, a valve (2) seat and a valve spring, characterized in that The valve guide is as claimed in any one of claims 1-8.

10. A cylinder head assembly comprising a cylinder head (3) and a valve train assembly, characterized in that The valve assembly is as claimed in claim 9.

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