A new cylinder head cover structure and diesel engine

Abstract

The utility model discloses a novel cylinder cover cover structure, including cylinder cover upper cover, cylinder cover middle cover and cylinder cover lower cover three layer structure, cylinder cover upper cover detachably installed on cylinder cover middle cover, cylinder cover middle cover detachably installed on cylinder cover lower cover, cylinder cover lower cover fixed mounting on cylinder cover, cylinder cover middle cover on set high pressure oil pipe interface, high pressure oil pipe interface is connected with oil atomizer, when needing to adjust valve clearance, remove cylinder cover upper cover, when needing to remove oil atomizer, remove cylinder cover upper cover and cylinder cover middle cover, the utility model discloses can effectively solve because of oil atomizer removal and cylinder cover lower cover interference, oil atomizer can not be removed alone, need to remove cylinder cover lower cover and rocker arm shaft assembly first, assemble again, need to adjust valve clearance specially once, lead to the problem of consuming repair time and consuming manpower, further improve the repair efficiency and reduce the manpower input simultaneously.

Description

Technical Field

[0001] This utility model belongs to the technical field of diesel engine cylinder head cover, specifically relating to a novel cylinder head cover structure and a diesel engine. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] In the field of diesel engines, the cylinder head cover is one of the key engine components, used to seal the cylinder head and protect internal components. In existing technology, a certain mining truck diesel engine uses a two-layer cylinder head cover structure, consisting of an upper cylinder head cover and a lower cylinder head cover. This design offers some convenience when adjusting valve clearance, as only the upper cylinder head cover needs to be removed. However, when it is necessary to replace the injector, interference with the lower cylinder head cover during injector removal prevents the injector from being removed independently; the lower cylinder head cover must be removed first, which in turn requires disassembling the rocker arm shaft assembly, complicating the maintenance process. During reassembly, the valve clearance must be specifically adjusted due to the change in the rocker arm shaft assembly, which not only prolongs maintenance time but also increases manpower consumption and reduces overall maintenance efficiency.

[0004] Therefore, the existing two-layer cylinder head cover structure has the following problems: 1. The interference between the injector and the lower cylinder head cover forces maintenance personnel to disassemble more components, increasing unnecessary steps; 2. The disassembly and reassembly process is cumbersome, especially the adjustment of valve clearance, which requires professional tools and skilled operation, and is time-consuming and labor-intensive; 3. The complex disassembly process increases the workload of maintenance personnel, and this problem is particularly prominent in the application of heavy equipment such as mining trucks. Utility Model Content

[0005] The purpose of this utility model is to provide a novel cylinder head cover structure and diesel engine, which can effectively solve the problem that the injector cannot be disassembled independently due to interference with the cylinder head cover during disassembly. It requires disassembling the cylinder head cover and rocker arm shaft assembly first, and then adjusting the valve clearance once during reassembly, resulting in time-consuming and labor-intensive maintenance.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: In a first aspect, embodiments of this utility model provide a novel cylinder head cover structure, comprising a three-layer structure of an upper cylinder head cover, a middle cylinder head cover, and a lower cylinder head cover. The upper cylinder head cover is detachably mounted on the middle cylinder head cover, the middle cylinder head cover is detachably mounted on the lower cylinder head cover, and the lower cylinder head cover is fixedly mounted on the cylinder head. A high-pressure oil pipe interface is provided on the middle cylinder head cover, and the high-pressure oil pipe interface is connected to an injector. When valve clearance needs to be adjusted, the upper cylinder head cover is removed; when the injector needs to be removed, both the upper and middle cylinder head covers are removed.

[0007] As a further technical solution, the upper cylinder head cover is a cover structure, while the middle cylinder head cover and the lower cylinder head cover are frame structures.

[0008] As a further technical solution, the height of the cylinder head inner cover is less than the height of the cylinder head lower cover.

[0009] As a further technical solution, the opening area of ​​the upper surface of the cylinder head cover is smaller than the opening area of ​​the lower surface, and the high-pressure oil pipe interface is located on the upper surface of the cylinder head cover and connected to the injector through an inclined high-pressure oil pipe.

[0010] As a further technical solution, a rocker arm shaft assembly and a valve bridge assembly are provided inside the lower cylinder head cover.

[0011] As a further technical solution, the cylinder head upper cover and cylinder head middle cover are connected by multiple bolts and sealed by rubber rings.

[0012] As a further technical solution, the upper surface of the cylinder head cover is provided with a rubber ring sealing groove, and a rubber ring is installed in the rubber ring sealing groove.

[0013] As a further technical solution, the cylinder head inner cover and the cylinder head lower cover are connected by multiple bolts and sealed by rubber rings.

[0014] As a further technical solution, the cylinder head lower cover and the cylinder head are connected by multiple bolts and sealed by rubber rings.

[0015] Secondly, embodiments of this utility model provide a diesel engine including the novel cylinder head cover structure described in the first aspect.

[0016] The beneficial effects of the above-described embodiments of this utility model are as follows: This invention, through its innovative three-layer cylinder head cover structure design, effectively improves the maintenance efficiency of diesel engine components. Traditional two-layer structures require the sequential disassembly of the upper cover, lower cover, and rocker arm shaft assembly when replacing injectors. This complex process not only takes several hours but, more importantly, necessitates readjusting the valve clearance during reassembly—a precision procedure that demands extremely high skill levels from maintenance personnel and carries the risk of adjustment errors. This invention, by adding a secondary cylinder head cover, achieves "precise isolation" in maintenance operations—when injector replacement is needed, only the upper and secondary covers need to be disassembled, completely avoiding interference with the rocker arm assembly inside the lower cover.

[0017] The cylinder head cover structure provided by this utility model enables a modular maintenance method, which shortens maintenance time and improves maintenance efficiency. At the same time, by avoiding repeated adjustments to valve clearance, maintenance personnel do not need to carry special adjustment tools; ordinary mechanics can complete the work, significantly reducing the skill requirements and labor intensity.

[0018] The cylinder head cover structure provided by this utility model has independent sealing rings between the upper cover, middle cover, and lower cover, forming a multi-layer seal that effectively prevents oil leakage and contaminant intrusion. In particular, when the middle cover needs to be frequently disassembled for maintenance, its independent sealing interface will not affect the integrity of the main sealing system of the lower cover, thereby ensuring that the core components work in a clean environment for a long time and extending the overhaul interval.

[0019] The cylinder head cover structure provided by this utility model allows the middle cover to bear the maintenance and disassembly stress that the lower cover in a traditional structure would have to withstand, while the lower cover, as a permanent base, remains stable and fixed, avoiding problems such as bolt hole wear and sealing surface deformation caused by repeated disassembly and assembly. From a cost perspective, although an additional middle cover component is added initially, there is no need to replace the lower cover gasket or periodically adjust the valve clearance during maintenance, reducing the material cost per maintenance. More importantly, this design avoids the risk of secondary damage that may result from frequent disassembly and assembly of the rocker arm assembly, reducing derivative maintenance costs. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0021] Figure 1 This is a schematic diagram of the overall structure of the cylinder head cover of this utility model; Figure 2 This is a schematic diagram of the cylinder head cover structure of this utility model, showing the disassembly of the cylinder head cover. Figure 3 This is a schematic diagram of the structure of the cylinder head cover of this utility model; Figure 4 This is a schematic diagram of the structure of the cylinder head cover of this utility model; Figure 5 This is a schematic diagram of the structure of the cylinder head lower cover of this utility model.

[0022] The diagram is for illustrative purposes only. The components include: 1. Cylinder head upper cover; 2. Cylinder head middle cover; 3. Cylinder head lower cover; 4. Cylinder head; 5. High-pressure oil pipe interface; 6. Injector; 7. Rocker arm shaft assembly; 8. Valve bridge assembly; and 9. Rubber ring sealing groove. Detailed Implementation

[0023] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] Example 1 In existing technology, cylinder head covers are usually divided into upper cylinder head covers and lower cylinder head covers. The rocker arm shaft assembly and valve bridge assembly are installed inside the lower cylinder head cover. The lower cylinder head cover is mounted on the cylinder head and has a high-pressure oil pipe interface that connects to the injector. When replacing the injector, the lower cylinder head cover needs to be removed. However, the bottom opening of the lower cylinder head cover is usually smaller than the installation space of the rocker arm shaft assembly. Therefore, when removing the lower cylinder head cover, it will interfere with the rocker arm shaft assembly. The rocker arm shaft assembly needs to be removed first, and then the lower cylinder head cover needs to be removed. This causes the rocker arm shaft assembly to change, and the valve clearance must be specially adjusted after reinstalling the rocker arm shaft assembly.

[0025] To solve the above problems, in a typical embodiment of this utility model, such as... Figures 1 to 5 As shown, a novel cylinder head cover structure is provided, comprising a three-layer structure of an upper cylinder head cover 1, a middle cylinder head cover 2, and a lower cylinder head cover 3. The upper cylinder head cover 1 is detachably mounted on the middle cylinder head cover 2, the middle cylinder head cover 2 is detachably mounted on the lower cylinder head cover 3, and the lower cylinder head cover 3 is fixedly mounted on the cylinder head 4. A high-pressure oil pipe interface 5 is provided on the middle cylinder head cover, and the high-pressure oil pipe interface 5 is connected to an injector 6. When it is necessary to adjust the valve clearance, the upper cylinder head cover 1 is removed; when it is necessary to remove the injector 6, the upper cylinder head cover 1 and the middle cylinder head cover 2 are removed.

[0026] The novel cylinder head cover structure provided in this embodiment solves the structural interference problem during maintenance. Traditional double-layer designs require disassembling the lower cover and rocker arm shaft assembly when replacing injectors. This structure, by adding a middle cover layer, allows injector maintenance to be performed only by disassembling the upper and middle covers, avoiding disturbance to the rocker arm shaft assembly inside the lower cover. This saves time on rocker arm shaft assembly installation and removal, as well as valve clearance adjustment. This design simplifies the maintenance process from "multi-layered disassembly" to "precise local operation," significantly shortening maintenance time and reducing the risk of valve clearance errors caused by repeated disassembly and reassembly. Furthermore, the high-pressure oil pipe interface is directly integrated into the middle cover. When replacing injectors, only the middle cover that interferes with the injector needs to be removed. This also allows for a more compact oil circuit layout, reducing oil pressure loss due to pipe bends and improving engine operating stability.

[0027] In this embodiment, the upper cylinder head cover is a cover structure, while the middle and lower cylinder head covers are frame structures. Therefore, after the upper cylinder head cover is removed, the internal components of the cylinder head can be exposed, thereby enabling adjustment of the valve clearance.

[0028] Meanwhile, the original cylinder head lower cover is divided into a cylinder head middle cover and a cylinder head lower cover. The height of the cylinder head middle cover is less than that of the cylinder head lower cover, and the opening area of ​​the upper surface of the cylinder head middle cover is less than that of the lower surface. The high-pressure oil pipe interface is located on the upper surface of the cylinder head middle cover and is connected to the injector through an inclined high-pressure oil pipe. Since the cylinder head middle cover is just a frame structure with a very small height, it will not interfere with the rocker arm shaft assembly when the cylinder head middle cover is disassembled. At the same time, it can expose the injector and disassemble the injector. Therefore, the problem of interference between the original cylinder head lower cover disassembly and the rocker arm shaft assembly is solved.

[0029] In this embodiment, a rocker arm shaft assembly 7 and a valve bridge assembly 8 are disposed inside the lower cylinder head cover. The components mounted on the cylinder head are mainly located within the internal space of the lower cylinder head cover; therefore, they will not interfere with the internal components when the cylinder head cover is removed, and thus disassembly is unnecessary.

[0030] In this embodiment, the upper cylinder head cover and the middle cylinder head cover are connected by multiple bolts and sealed with rubber rings. The upper surface of the middle cylinder head cover is provided with a rubber ring sealing groove 9, and a rubber ring is installed within the rubber ring sealing groove 9. Further, the middle cylinder head cover and the lower cylinder head cover are connected by multiple bolts and sealed with rubber rings. Further, the lower cylinder head cover and the cylinder head are connected by multiple bolts and sealed with rubber rings.

[0031] Understandably, the upper and middle covers of the cylinder head, the middle and lower covers, and the lower cover and cylinder head are all connected by bolts and sealed with rubber rings. This combination of multiple bolt connections and rubber ring seals creates a "gradient sealing system." The upper and middle covers have fewer bolts (e.g., 5) for easy disassembly and assembly; the middle and lower covers have more bolts (e.g., 7) to ensure load-bearing strength. The rubber ring groove design concentrates the sealing pressure on the groove wall, improving efficiency by 20% compared to traditional flat seals. Furthermore, the layered sealing allows for localized replacement of damaged rubber rings, reducing maintenance costs.

[0032] The novel cylinder head cover structure provided by this utility model allows for easy adjustment of valve clearance by simply removing the upper cylinder head cover. When replacing the injector, the middle cylinder head cover can be removed to disassemble the injector without needing to remove the lower cylinder head cover. Therefore, the rocker arm shaft assembly does not need to be disassembled, and the valve clearance does not need to be adjusted separately during reassembly. This effectively solves the problem of time-consuming and labor-intensive maintenance caused by the injector's interference with the lower cylinder head cover during disassembly, which necessitates the removal of the lower cylinder head cover and rocker arm shaft assembly, followed by a separate valve clearance adjustment during reassembly. This improves maintenance efficiency and reduces manpower input.

[0033] Example 2 In one typical embodiment of this utility model, a diesel engine is provided, including the novel cylinder head cover structure described in Example 1.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel cylinder head cover structure, characterized in that, The cylinder head consists of a three-layer structure, including an upper cylinder head cover (1), a middle cylinder head cover (2), and a lower cylinder head cover (3). The upper cylinder head cover (1) is detachably mounted on the middle cylinder head cover (2), the middle cylinder head cover (2) is detachably mounted on the lower cylinder head cover (3), and the lower cylinder head cover (3) is fixedly mounted on the cylinder head (4). A high-pressure oil pipe interface (5) is provided on the middle cylinder head cover (2), and the high-pressure oil pipe interface (5) is connected to the injector (6). When it is necessary to adjust the valve clearance, the upper cylinder head cover (1) is removed. When it is necessary to remove the injector (6), the upper cylinder head cover (1) and the middle cylinder head cover (2) are removed.

2. The novel cylinder head cover structure as described in claim 1, characterized in that, The cylinder head upper cover (1) is a cover structure, and the cylinder head middle cover (2) and cylinder head lower cover (3) are frame structures.

3. The novel cylinder head cover structure as described in claim 2, characterized in that, The height of the cylinder head middle cover (2) is less than the height of the cylinder head lower cover (3).

4. The novel cylinder head cover structure as described in claim 2, characterized in that, The opening area on the upper surface of the cylinder head cover (2) is smaller than the opening area on the lower surface. The high-pressure oil pipe interface (5) is located on the upper surface of the cylinder head cover (2) and is connected to the injector (6) through an inclined high-pressure oil pipe.

5. The novel cylinder head cover structure as described in claim 1, characterized in that, The lower cylinder head cover (3) is provided with a rocker arm shaft assembly (7) and a valve bridge assembly (8).

6. The novel cylinder head cover structure as described in claim 1, characterized in that, The cylinder head upper cover (1) and cylinder head middle cover (2) are connected by multiple bolts and sealed by rubber rings.

7. The novel cylinder head cover structure as described in claim 6, characterized in that, The upper surface of the cylinder head cover (2) is provided with a rubber ring sealing groove (9), and a rubber ring is installed in the rubber ring sealing groove (9).

8. The novel cylinder head cover structure as described in claim 1, characterized in that, The cylinder head inner cover (2) and cylinder head lower cover (3) are connected by multiple bolts and sealed by rubber rings.

9. The novel cylinder head cover structure as described in claim 1, characterized in that, The cylinder head lower cover (3) and cylinder head (4) are connected by multiple bolts and sealed by rubber rings.

10. A diesel engine, characterized in that, Including the novel cylinder head cover structure as described in any one of claims 1-9.

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