A new type of seal gasket for irregular shaped cylinder head

Abstract

The utility model discloses a novel special-shaped valve chamber body sealing gasket relates to the sealing structure technical field between air -cooled diesel engine valve chamber body and cylinder cover, including sealing gasket body, sealing gasket body is integral special-shaped structure, adopts graphite composite material to make, is used for clamping between valve chamber body and cylinder cover, sealing gasket body shape is completely matched with valve chamber body bottom sealing position, to replace original brass gasket and glasses shape gasket, and sealing gasket improves sealing effect through the optimization of material and structure obviously, sealing gasket body is equipped with four bolt holes, and the size is matched with cylinder cover fixed bolt hole position correspondence, sealing gasket body still is equipped with two stud holes, and the size is matched with valve chamber body's stud hole position correspondence, sealing gasket body adopts hollow ingot shape structure, is used for leading out cylinder cover vertical fin air duct in cooling wind, improves engine heat dissipation efficiency, arc structure is used for avoiding oil atomizer installation, avoids interference.

Description

Technical Field

[0001] This utility model relates to the field of sealing structure technology, and in particular to a novel irregularly shaped valve chamber sealing gasket. Background Technology

[0002] In practical applications of air-cooled diesel engines, the sealing performance between the valve chamber and the cylinder head plays a crucial role in the engine's reliability and service life. As an important component of the engine's lubrication system, the valve chamber stores engine oil to lubricate critical components such as the valve mechanism. Once the seal fails, oil leakage will not only cause oil consumption but may also lead to insufficient lubrication of internal engine parts, resulting in accelerated wear, reduced power, and even serious mechanical failures.

[0003] Currently, air-cooled diesel engines commonly use a combination of brass gaskets and spectacle-shaped gaskets for sealing, sandwiching them between the valve chamber and cylinder head to prevent oil leakage. However, this sealing structure has a significant drawback: the brass gasket and spectacle gasket have tolerances during manufacturing. When both are at extreme tolerance levels (i.e., the brass gasket is at its maximum tolerance and the spectacle gasket at its minimum tolerance, or vice versa), a height difference will occur between the two gaskets on the same sealing plane, leading to a poor seal and oil leakage from the gaps.

[0004] Furthermore, once a seal fails, maintenance personnel need to disassemble the valve chamber and cylinder head to replace two different gaskets, which is not only cumbersome but also time-consuming and labor-intensive, severely impacting the normal operating efficiency of the equipment. With the market's increasing demands for the reliability and ease of maintenance of air-cooled diesel engines, the design of traditional sealing gaskets can no longer meet the needs of modern industrial production. There is an urgent need to develop a new sealing structure to solve the oil leakage problem and improve the overall performance and maintenance efficiency of air-cooled diesel engines. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a novel irregular-shaped valve chamber sealing gasket. By adopting an integral irregular-shaped sealing gasket made of graphite composite material, it solves the technical problems of poor sealing caused by tolerance differences in traditional brass gaskets and spectacle-shaped gaskets, oil leakage at the vertical heat sink of the cylinder head of air-cooled diesel engines, as well as the large workload of maintenance and replacement and inconvenient inspection.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A novel irregular-shaped valve chamber sealing gasket includes a gasket body, which is an integral irregular-shaped structure made of graphite composite material, used to clamp between the valve chamber and the cylinder head. The shape of the gasket body perfectly matches the sealing part at the bottom of the valve chamber, replacing the original brass gasket and spectacle-shaped gasket. The graphite composite material has a temperature resistance range of -200℃ to 600℃, and the gasket body thickness is 1.3mm. The optimization of materials and structure significantly improves the sealing effect. The gasket body has four bolt holes with a diameter of 8.5mm, which correspond to and match the size of the cylinder head fixing bolt holes. The gasket body also has two double-ended stud holes with a diameter of 10.5mm, which correspond to and match the size of the double-ended stud holes in the valve chamber, ensuring stable installation.

[0008] Preferably, the sealing gasket body adopts a hollow ingot-shaped structure to guide the cooling air in the cylinder head vertical heat sink air duct, thereby improving the engine cooling efficiency; and it is equipped with a circular arc structure with a radius of 15mm to avoid interference with the fuel injector installation.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] This invention effectively solves the problem of oil leakage in the valve chamber of an air-cooled diesel engine through innovative design of the sealing gasket material and structure, achieving multi-faceted performance improvements. A 1.3mm graphite composite plate with a temperature resistance of -200℃ to 600℃ is used to replace the traditional brass and spectacle-shaped gaskets. Thanks to the material's excellent corrosion resistance and high / low temperature performance, the risk of oil leakage due to sealing material failure is eliminated from the material itself. The integral irregular structure perfectly matches the bottom sealing part of the valve chamber, eliminating the defect of the original two types of gaskets that could not seal due to height differences caused by tolerance variations, thus improving sealing reliability. The precise design of four 8.5mm bolt holes and two 10.5mm double-ended stud holes ensures stable installation and avoids the risk of leakage caused by loosening. The hollow ingot-shaped design improves the cooling airflow efficiency, effectively cooling the cylinder head and improving engine operating efficiency; the 15mm arc structure cleverly avoids the injector, eliminating installation interference problems. In addition, the integrated design improves installation and inspection efficiency, reduces the types of inspections and workload, significantly reduces maintenance and time costs, and provides a reliable guarantee for the stable operation of air-cooled diesel engines. Attached Figure Description

[0011] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Illustration: 1. Sealing gasket body; 2. Bolt hole; 3. Double-ended stud hole; 4. Arc structure. Detailed Implementation

[0014] This application provides a novel irregular-shaped valve chamber gasket. By using an integral irregular-shaped gasket made of graphite composite material, it solves the technical problems of poor sealing caused by tolerance differences in traditional brass gaskets and spectacle-shaped gaskets, oil leakage at the vertical heat sink of the cylinder head of air-cooled diesel engines, as well as the large workload of maintenance and replacement and inconvenient inspection.

[0015] Example

[0016] like Figure 1 As shown, the overall technical solution in this application embodiment is as follows:

[0017] To address the problems existing in the prior art, this utility model provides a novel irregularly shaped valve chamber sealing gasket. The specific embodiments of this utility model focus on the fabrication, installation, and use of the novel irregularly shaped valve chamber sealing gasket, ensuring its sealing performance and function are achieved.

[0018] Fabrication of sealing gasket body 1:

[0019] Material Selection and Processing: A 1.3mm thick graphite composite plate is selected as the sealing gasket material. The graphite composite plate's corrosion resistance and resistance to high and low temperatures (-200℃—600℃) meet the operating environment requirements of the air-cooled diesel engine. Using high-precision laser cutting equipment, the graphite composite plate is cut into an integral irregular structure according to the shape of the sealing part at the bottom of the valve chamber, ensuring the fitting accuracy between the sealing gasket body 1 and the valve chamber and cylinder head.

[0020] Hole Machining: On the cut and shaped sealing gasket body 1, four bolt holes 2 with a diameter of 8.5mm and two double-ended stud holes 3 with a diameter of 10.5mm are machined using a CNC drilling machine. The bolt holes 2 are precisely aligned with the cylinder head fixing bolt holes, and the double-ended stud holes 3 are precisely matched with the double-ended stud holes in the valve chamber body. During machining, the hole position error is strictly controlled within ±0.1mm to ensure stability during installation. At the same time, a chamfering process is used to treat the hole edges to prevent stress concentration.

[0021] The sealing gasket body 1 is machined into a hollow ingot-shaped structure using a die-stamping process. This structure effectively guides the cooling airflow in the vertical heat sink duct of the cylinder head, enhancing the cooling effect on the cylinder head. At the corresponding position for the injector installation, an arc structure 4 with a radius of 15mm is formed by die forming or subsequent milling to ensure that the injector does not interfere with the sealing gasket during installation.

[0022] Installation of sealing gasket body 1:

[0023] Preparation before installation: Before installing the new irregular-shaped valve chamber gasket, the sealing surfaces of the valve chamber and cylinder head must be cleaned. Use a lint-free cloth and a special cleaning agent to remove oil, impurities, and residual sealant from the surfaces, ensuring that the sealing surfaces are flat and clean. At the same time, check the integrity and thread condition of the cylinder head fixing bolts, studs, and other connecting parts.

[0024] Gasket Installation: Place the prepared gasket body 1 stably on the sealing surface of the valve chamber, ensuring that the bolt holes and stud holes on the gasket are perfectly aligned with the corresponding holes on the valve chamber and cylinder head. Next, install the cylinder head in sequence, passing the cylinder head fixing bolts through the bolt holes on the gasket body 1 and the cylinder head, and screwing them into the corresponding threaded holes. Pass the studs through the stud holes 3 on the gasket body 1 and tighten them onto the valve chamber. Using a torque wrench, tighten the bolts and studs evenly in 2-3 diagonal stages to the specified torque, ensuring uniform pressure on the gasket body 1 for a good sealing effect.

[0025] After installation, the sealing gasket body 1 is tested for sealing performance. A pneumatic test is used, introducing compressed air at a certain pressure (e.g., 0.2 MPa) into the valve chamber. Soapy water is applied to the edge of the sealing gasket body 1, and the presence of bubbles is observed. If no bubbles appear, the sealing gasket is considered properly installed. Alternatively, during diesel engine test runs, oil leakage can be observed at the vertical cooling fins of the cylinder head. Because the new sealing gasket has an integral structure, compared to the two previous types of gaskets, only this gasket needs to be sampled for inspection, significantly reducing the workload and time cost.

[0026] Working principle:

[0027] After installation and inspection, the sealing gasket body 1 is put into use in an air-cooled diesel engine. During engine operation, the hollow ingot-shaped structure effectively guides cooling air to cool the cylinder head, maintaining efficient engine operation; the 15mm radius arc structure 4 ensures proper installation and operation of the fuel injector, avoiding interference issues. Simultaneously, the graphite composite plate material and integral irregular structure effectively overcome the sealing failure problem caused by tolerance differences in the original sealing gasket, significantly improving sealing performance, reducing oil leakage, and lowering the workload and maintenance costs for maintenance personnel.

[0028] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A novel irregular-shaped valve chamber sealing gasket, characterized in that, Including a sealing gasket body made of graphite composite material (1); The shape of the sealing gasket body (1) is perfectly matched with the sealing part at the bottom of the valve chamber body, and the thickness of the sealing gasket body (1) is 1.3mm; The sealing gasket body (1) is provided with four bolt holes (2) with a diameter of 8.5mm, which correspond to the positions and sizes of the cylinder head fixing bolt holes; The sealing gasket body (1) is also provided with two double-ended stud holes (3) with a diameter of 10.5mm, which correspond to the position and size of the double-ended stud holes of the valve chamber body to ensure stable installation.

2. The novel irregular-shaped valve chamber sealing gasket as described in claim 1, characterized in that: The sealing gasket body (1) adopts a hollow ingot-shaped structure to exhaust the cooling air in the vertical heat sink duct of the cylinder head, thereby improving the engine's heat dissipation efficiency.

3. The novel irregular-shaped valve chamber sealing gasket as described in claim 1, characterized in that: The sealing gasket body (1) is also provided with an arc structure (4) with a radius of 15mm to avoid interference with the fuel injector installation.

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