Built-in valve oil seal for engine

Abstract

The utility model discloses an engine is with built -in valve oil seal relates to engine accessory technical field, including metal framework, the inner wall of metal framework is passed through and is opened five groups of oil leak hole, and the outer wall of metal framework is opened and has the oil leak groove. The utility model discloses, adopt five groups of circumferential even distribution's oil leak passage design, compares traditional single -channel or double -channel structure, has promoted total oil leak through -flow area, can quickly intercept and export the excessive machine oil in the valve guide pipe and valve stem gap, especially the directional oil return structure that sealing plate, oil inlet hole and oil drain hole constitute, can effectively prevent the blockage caused by the reverse flow of machine oil in the oil return process in the oil leak groove, avoids the accumulation of machine oil in the sealing area, reduces the engine oil consumption, effectively reduces the carbon deposit generation caused by the machine oil into the combustion chamber, further guarantees the stability of the oil leak efficiency.

Description

Technical Field

[0001] This utility model relates to the field of engine parts technology, and in particular to an internal valve stem seal for engines. Background Technology

[0002] Valve stem seals are critical sealing components in the engine valve system. Their core function is to intercept excess engine oil in the gap between the valve guide and the valve stem, preventing oil from entering the combustion chamber and causing problems such as carbon buildup, excessive emissions, and excessive oil consumption. Simultaneously, they must ensure the smooth return of engine oil to the oil pan for recycling. Currently, most mainstream valve stem seals employ a "shell + sealing lip + single drain channel" structural design. The shell is fixed to the end of the valve guide by interference fit, and the sealing lip relies on a self-tightening spring to adhere to the valve stem for sealing. The intercepted engine oil flows back to the oil pan through a single drain hole.

[0003] However, existing technologies have many limitations that need to be addressed: low oil draining efficiency, limited flow area of ​​a single oil draining channel, and most oil drain holes are straight holes without a flow guiding structure, resulting in high oil flow resistance and easy accumulation of engine oil in the sealing area, which in turn seeps into the combustion chamber and increases the oil consumption rate. Therefore, an internal valve stem seal for engines is proposed. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing an internal valve oil seal for engines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an engine built-in valve stem seal, comprising a metal frame, wherein the inner wall of the metal frame is provided with five sets of oil drain holes, the outer wall of the metal frame is provided with an oil drain groove, a sealing plate is installed at the lower end of the metal frame, the upper end of the sealing plate is provided with five sets of oil inlet holes, and the outer wall of the sealing plate is provided with five sets of oil outlet holes.

[0006] Preferably, the inner walls of the five sets of oil drain holes are all chamfered, and the upper parts of the five sets of oil drain grooves are respectively connected to the interior of the five sets of oil drain holes.

[0007] Preferably, the lower part of the five sets of oil drain grooves is located above the five sets of oil inlet holes, and the lower end of the five sets of oil inlet holes is respectively connected to the upper end of the five sets of oil drain holes.

[0008] Preferably, the inner wall of the metal frame is provided with an annular groove, and a sealing ring is provided inside the annular groove.

[0009] Preferably, the upper end of the metal frame is welded with a threaded component.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] 1. In this utility model, a design of five circumferentially evenly distributed oil drain channels is adopted. Compared with the traditional single-channel or dual-channel structure, the total oil drain flow area is increased, which can quickly intercept and discharge excess oil in the gap between the valve guide and the valve stem. In particular, the directional oil return structure formed by the sealing plate, oil inlet and oil outlet can effectively prevent oil from flowing back into the oil drain groove during the oil return process and causing blockage. It avoids the accumulation of oil in the sealing area, reduces engine oil consumption, effectively reduces carbon deposit formation caused by oil entering the combustion chamber, and further ensures the stability of oil drain efficiency.

[0012] 2. In this utility model, the chamfered design of the oil drain hole and the optimized U-shaped structure of the oil drain groove reduce the oil flow resistance and prevent oil from accumulating in the sealing area; the high-strength design of the metal skeleton and the reliable connection of the threaded parts ensure that the oil seal does not loosen or deform under the high-frequency vibration and high-temperature conditions of the engine, further guaranteeing the stability of the sealing performance. Attached Figure Description

[0013] Figure 1 This utility model provides a three-dimensional structural schematic diagram of an internal valve stem seal for an engine;

[0014] Figure 2 This utility model provides a half-sectional structural diagram of an engine built-in valve stem seal;

[0015] Figure 3 This utility model provides a schematic diagram of the structure of a metal skeleton for an engine's built-in valve stem seal;

[0016] Figure 4 This utility model presents a structural schematic diagram of a sealing plate for an engine with an internal valve stem seal.

[0017] Legend: 1. Metal frame; 2. Threaded part; 3. Oil drain hole; 4. Oil drain groove; 5. Sealing plate; 6. Chamfer; 7. Oil inlet hole; 8. Oil outlet hole; 9. Circular groove; 10. Sealing ring. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Example 1: As Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides an internal valve stem seal for an engine, including a metal frame 1. The inner wall of the metal frame 1 has five sets of oil drain holes 3, and the outer wall of the metal frame 1 has oil drain grooves 4. A sealing plate 5 is installed at the lower end of the metal frame 1. The upper end of the sealing plate 5 has five sets of oil inlet holes 7, and the outer wall of the sealing plate 5 has five sets of oil outlet holes 8. The inner walls of the five sets of oil drain holes 3 are all chamfered 6. The upper parts of the five sets of oil drain grooves 4 are respectively connected to the interior of the five sets of oil drain holes 3, and the lower parts of the five sets of oil drain grooves 4 are respectively located above the five sets of oil inlet holes 7. The lower ends of the five sets of oil inlet holes 7 are respectively connected to the upper ends of the five sets of oil outlet holes 8.

[0021] The specific settings and functions of this embodiment will be described in detail below. The metal skeleton 1, as the core support component of the entire oil seal, is made of high-strength alloy material, possessing excellent deformation resistance and high-temperature resistance, and can adapt to the complex operating conditions of the engine; to achieve a reliable connection with the valve guide,

[0022] The oil draining system is the core innovation of this oil seal. It consists of five sets of oil drain holes 3, five sets of oil drain grooves 4, five sets of oil inlet holes 7 and five sets of oil outlet holes 8 on the sealing plate 5, forming a multi-channel directional oil return path. The specific structural design is as follows:

[0023] Oil drain hole 3 design: Five sets of oil drain holes 3 are evenly distributed along the inner circumference of the metal skeleton 1, forming an internal and external connecting channel through the skeleton wall thickness; in order to avoid oil accumulation at the hole opening and blockage, the inner walls of the five sets of oil drain holes 3 are all provided with chamfers 6, the angle of chamfer 6 is 45°, which increases the flow area of ​​oil inflow and reduces the resistance loss when oil flows, so that oil can quickly enter the interior of the oil drain hole 3;

[0024] The oil drain groove 4 and the oil inlet hole 7 are matched by a design: five sets of oil drain grooves 4 are opened on the outer wall of the metal frame 1 corresponding to the position of the oil drain hole 3. The width and depth of the grooves are optimized by fluid dynamics simulation to ensure that the oil flows smoothly and without stagnation in the grooves. The upper part of the oil drain groove 4 is precisely connected to the interior of the oil drain hole 3, so that the oil flowing out of the oil drain hole 3 can be directly introduced into the oil drain groove 4. The lower part of the oil drain groove 4 is precisely aligned with the five sets of oil inlet holes 7 on the sealing plate 5. The diameter of the oil inlet hole 7 is slightly larger than the outlet width of the oil drain groove 4, forming a "wide inlet and narrow outlet" guide structure to guide the oil to flow into the oil inlet hole 7 efficiently.

[0025] Design of sealing plate 5 and oil drain hole 8: The sealing plate 5 is installed at the lower end of the metal frame 1 by bolt fastening. The sealing plate 5 is made of corrosion-resistant steel plate, and a sealing gasket is set on the mating surface with the metal frame 1 to prevent oil leakage from the mating surface. The core design intention of the sealing plate 5 is to build a "one-way oil guide barrier". The five sets of oil inlet holes 7 opened at the upper end corresponding to the position of the oil drain groove 4 can accurately receive the oil flowing down from the oil drain groove 4. The five sets of oil drain holes 8 opened on the outer wall, which are connected with the oil inlet holes 7 to form a turning return oil channel, can directly guide the oil towards the engine oil pan. This structural design can effectively prevent the oil from flowing back into the oil drain groove 4 due to the deviation of the flow direction or pressure fluctuation during the return oil process, prevent the oil from accumulating in the oil drain groove 4, ensure that the oil drain channel always remains unobstructed, and ensure stable oil drain efficiency.

[0026] Example 2: Figure 1 , Figure 2 and Figure 3 As shown, the inner wall of the metal frame 1 is provided with an annular groove 9, and a sealing ring 10 is provided inside the annular groove 9. A threaded part 2 is welded to the upper end of the metal frame 1.

[0027] The overall effect of this embodiment is that the upper end of the metal frame 1 is fixed with a threaded part 2 by welding. The weld is inspected to ensure that there are no defects such as false welding or missing welding. The thread specification of the threaded part 2 is precisely matched with the internal thread of the valve guide, so that the oil seal can be quickly positioned and installed by tightening the thread. Compared with the traditional interference fit method, the assembly efficiency is improved by more than 30%, and subsequent disassembly and maintenance are more convenient.

[0028] To achieve dynamic sealing between the valve stem and the guide, a circular groove 9 is formed on the inner wall of the metal skeleton 1, and a sealing ring 10 is embedded inside it. The sealing ring 10 is made of a composite material of fluororubber and polytetrafluoroethylene, which combines the high elasticity of fluororubber with the wear resistance of polytetrafluoroethylene. Under the limiting effect of the circular groove 9, the sealing ring 10 can tightly fit the surface of the valve stem to form an effective sealing surface. At the same time, the cross section of the sealing ring 10 adopts a lip design, which can generate a self-tightening force when the valve stem reciprocates, ensuring the stability of the sealing performance.

[0029] The usage and working principle of this device: Sealing and interception: The composite material sealing ring 10 in the annular groove 9 on the inner wall of the metal frame 1 tightly fits the valve stem to form a dynamic seal, intercepting excess engine oil in the gap between the valve guide and the valve stem, preventing it from entering the combustion chamber;

[0030] Directional oil draining: The intercepted oil flows into the five sets of oil drain holes 3 on the inner wall of the metal frame 1 (the inner wall chamfer 6 reduces flow resistance), and then into the corresponding U-shaped oil drain groove 4 on the outer wall, and is precisely guided by the oil drain groove 4 to the oil inlet hole 7 of the sealing plate 5.

[0031] High-efficiency oil return: The oil inlet hole 7 is vertically connected to the oil drain hole 8 at the lower end of the sealing plate 5 to form a one-way oil guide channel. The engine oil flows directly back to the engine oil pan through this channel. At the same time, the sealing plate 5 can prevent the oil from flowing back into the drain groove 4, ensuring stable oil draining efficiency.

[0032] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. An integrated valve stem seal for an engine, comprising a metal frame (1), characterized in that: The inner wall of the metal frame (1) is provided with five sets of oil drain holes (3), the outer wall of the metal frame (1) is provided with oil drain grooves (4), the lower end of the metal frame (1) is provided with a sealing plate (5), the upper end of the sealing plate (5) is provided with five sets of oil inlet holes (7), and the outer wall of the sealing plate (5) is provided with five sets of oil outlet holes (8).

2. The built-in valve stem seal for an engine according to claim 1, characterized in that: The inner walls of the five sets of oil drain holes (3) are all provided with chamfers (6), and the upper parts of the five sets of oil drain grooves (4) are respectively connected to the interior of the five sets of oil drain holes (3).

3. The built-in valve stem seal for an engine according to claim 2, characterized in that: The lower parts of the five sets of oil drain grooves (4) are located above the five sets of oil inlet holes (7), and the lower ends of the five sets of oil inlet holes (7) are respectively connected to the upper ends of the five sets of oil drain holes (8).

4. The built-in valve stem seal for an engine according to claim 1, characterized in that: The inner wall of the metal frame (1) is provided with an annular groove (9), and a sealing ring (10) is provided inside the annular groove (9).

5. The built-in valve stem seal for an engine according to claim 1, characterized in that: The upper end of the metal frame (1) is welded with a threaded part (2).

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