Crankcase cover plate of diesel engine

Abstract

The utility model discloses a diesel engine crankcase cover plate which comprises a cover plate body matched with a crankcase, the cover plate body is made of magnesium alloy, a lubricating oil channel is arranged in the cover plate body, and the lubricating oil channel is communicated with a main lubricating oil supply system of an engine. According to the crankcase cover plate of the diesel engine, the cover plate body is made of the magnesium alloy material, and the lubricating oil channel is integrated on the cover plate body, so that the weight of the engine can be reduced, and the lubricating efficiency of the engine is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of engine parts, specifically, it relates to a crankcase cover for a diesel engine. Background Technology

[0002] In traditional engine design, crankcase covers often present several problems, such as their heavy material affecting overall engine weight and fuel economy; the layout of lubrication channels also tends to be limited. Typically, lubrication channels are designed and machined separately within the engine block or other related components, resulting in a complex engine structure, cumbersome assembly, and increased maintenance costs. Furthermore, this decentralized lubrication channel design can lead to uneven lubrication supply and significant pressure loss.

[0003] In the crankcase area, the existing crankcase cover only serves a sealing function and is independent of the lubrication oil passage system. It does not make full use of the space of the cover to optimize the delivery of lubricating oil, which affects the engine lubrication effect and overall performance.

[0004] Chinese Patent Application No. 201721034413.7 discloses a crankcase cover for a diesel engine, including a housing, the housing being configured as a groove shape, reinforcing ribs being provided inside the housing, mounting holes being distributed around the perimeter of the housing, and an oil groove being provided between adjacent mounting holes. The reinforcing ribs include transverse reinforcing ribs and longitudinal reinforcing ribs, which are arranged perpendicularly, and the oil groove is configured as a long strip-shaped oil groove.

[0005] The aim is to provide an improved crankcase cover for diesel engines. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a crankcase cover for a diesel engine, with the purpose of reducing engine weight.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a crankcase cover for a diesel engine, comprising a cover body adapted to the crankcase, the cover body being made of magnesium alloy, and a lubricating oil passage provided within the cover body, the lubricating oil passage being connected to the engine's main lubricating oil supply system.

[0008] The lubricating oil channels are distributed in a branch-like manner inside the cover plate body, and several oil cooler mounting holes are provided around the lubricating oil channels, with the oil cooler mounting holes located on the upper surface of the cover plate body.

[0009] The lubrication channel end face is provided with a process hole.

[0010] An oil cooler mounting port is provided on the outer surface of the cover plate body, and the oil cooler is installed at the oil cooler mounting port.

[0011] The outer surface of the cover plate body is provided with a fuel high-pressure rail mounting hole, and the fuel high-pressure rail is installed at the fuel high-pressure rail mounting hole.

[0012] A fuel pipe mounting bracket is provided on the outer surface of the cover plate body, and a first mounting hole is provided on the fuel pipe mounting bracket, and the fuel pipe is installed at the first mounting hole.

[0013] The cover plate body is provided with a third mounting hole, which corresponds to the mounting hole provided on the crankcase. Multiple third mounting holes are provided, and threads are machined in two of the diagonally arranged mounting holes.

[0014] A textured structure is provided on the sealing surface of the cover plate body that is connected to the crankcase, and a glue storage tank is provided on the cavity side of the cover plate body, which is configured to hold an appropriate amount of glue.

[0015] The cover plate body is provided with a first reinforcing rib, and the fuel high-pressure oil rail mounting hole, the oil cooler mounting hole, the fuel pipe mounting bracket and several third mounting holes are connected through the first reinforcing rib.

[0016] The cover plate body has a second reinforcing rib on the cavity side. The second reinforcing rib is shaped like a yoke and is connected to several third mounting holes.

[0017] The present invention relates to a diesel engine crankcase cover plate, the cover plate body being made of magnesium alloy material, and integrating a lubrication oil passage design on the cover plate body, which can reduce engine weight and improve engine lubrication efficiency. Attached Figure Description

[0018] This manual includes the following figures, which illustrate the following:

[0019] Figure 1 This is an exploded view of the diesel engine crankcase cover plate of this utility model;

[0020] Figure 2 This is a perspective view of the diesel engine crankcase cover plate of this utility model;

[0021] Figure 3 This is a rear view of the diesel engine crankcase cover plate of this utility model;

[0022] Figure 4 This is a sectional view of the diesel engine crankcase cover plate of this utility model;

[0023] The diagram is marked as follows:

[0024] 1. Cover plate body; 2. Mounting hole; 3. High-pressure fuel rail; 4. Plug; 5. Oil cooler; 6. Fuel pipe; 7. First mounting hole; 8. Second mounting hole; 9. High-pressure fuel rail mounting hole; 10. First reinforcing rib; 11. Oil cooler mounting hole; 12. Process hole; 13. Oil cooler mounting port; 14. Fuel pipe mounting bracket; 15. Third mounting hole; 16. Crankcase side oil inlet and outlet; 17. Rubber reservoir; 18. Second reinforcing rib; 19. Lubricating oil passage. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0026] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.

[0027] like Figures 1 to 4 As shown, this utility model provides a crankcase cover for a diesel engine, including a cover body 1 adapted to the crankcase, an oil cooler mounting port 13, a high-pressure fuel rail mounting hole 9, a fuel pipe mounting bracket 14, and a lubrication oil passage 19. The cover body 1 has a lubrication oil passage 19 connected to the engine's main lubrication oil supply system; a third mounting hole 15 is provided on the front of the cover body 1; an oil cooler 5 is fixed to the outer surface of the cover body 1, and the oil cooler mounting port 13 is used for mounting the oil cooler 5; the high-pressure fuel rail mounting hole 9 is located above the cover body 1, and the high-pressure fuel rail 3 is used for mounting the fuel high-pressure fuel rail; the fuel pipe mounting bracket 14 is integrated into the side wall of the cover body 1, and a first mounting hole 7 is machined into the fuel pipe 6 for fixing.

[0028] like Figure 1 , Figure 2 and Figure 4 As shown, the lubricating oil passages 19 are branched inside the cover plate body 1, allowing lubricating oil to enter and exit the oil cooler evenly. Several oil cooler mounting holes 11 are provided around the lubricating oil passages 19, and these holes 11 are located on the upper surface of the cover plate body 1. The cover plate body 1 and the lubricating oil passages 19 are integrated into one unit, reducing the overall weight of the engine and simplifying its structure and assembly. The several oil cooler mounting holes 11 around the lubricating oil passages 19 correspond to the second mounting holes 8 provided on the oil cooler 5 and are connected by bolts in a detachable manner, facilitating subsequent maintenance.

[0029] like Figure 4As shown, a process hole 12 is provided on the end face of the lubricating oil passage 19. During machining, the process hole 12 provides a channel for the cutting tool to enter and exit the lubricating oil passage 19. This ensures the tool can smoothly reach the fixed position of the oil passage for machining, allowing the tool to perform milling, drilling, and other operations along a reasonable path, ensuring the dimensional accuracy and surface quality of the oil passage. During casting, the process hole 12 serves as a venting channel, preventing air from being trapped in the mold cavity and causing defects such as porosity in the casting, affecting the quality of the parts. It also facilitates demolding operations and reduces the difficulty of mold development. During assembly of the cover plate body 1, the process hole 12 on the end face of the oil passage is sealed with glue using a threaded plug 4.

[0030] like Figure 3 As shown, the cover plate body 1 has sixteen third mounting holes 15, two of which are shared with the oil cooler mounting holes 11. The sixteen third mounting holes 15 are evenly distributed on the front of the cover plate body 1, corresponding to the mounting holes on the crankcase. Two diagonally arranged mounting holes 151 in the third mounting holes 15 of the cover plate body 1 are machined with M8×1.25 threads. This provides a dedicated leverage point when the cover plate body 1 needs to be disassembled. By screwing in matching bolts or other tools, the cover plate body 1 can be removed more easily using the tightening and pulling action of the threads. This method is more convenient and less likely to damage the cover plate body 1 and surrounding components compared to methods without these holes, which might require prying or knocking.

[0031] The mating surface between the cover plate body 1 and the crankcase is sealed with silicone. The sealing surface of the cover plate body 1 is machined with a textured structure, and the cavity side is designed with a silicone storage tank 17 structure. The textured structure is used to increase the contact area and adhesion of the silicone. The silicone storage tank 17 is used to hold an appropriate amount of silicone to enhance the sealing fit. The silicone in the silicone storage tank 17 can adhere more tightly to the edge of the gap, forming a continuous and tight sealing line, effectively preventing leakage of gas, lubricating oil, etc. inside the crankcase, and further improving the tightness of the seal.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, the oil cooler mounting port 13 and the area around the crankcase-side oil inlet and outlet ports 16 are provided with O-rings. The oil cooler mounting hole 13 is configured to fix the oil cooler 5. The O-rings around the oil cooler mounting port 13 and the crankcase-side oil inlet and outlet ports 16 are used to place O-rings. Using O-rings for sealing has the advantages of simple sealing structure, compact installation, and light weight. O-rings have good sealing performance, and when used for fixed sealing, there is almost no leakage, increasing the reliability of the seal.

[0033] The crankcase cover is primarily made of magnesium alloy. Magnesium alloy has a low density; the density of die-cast magnesium alloy is only 2 / 3 that of aluminum alloy and 1 / 4 that of steel. Its specific strength and specific stiffness are superior to steel and aluminum alloys, and far exceed those of engineering plastics. Furthermore, magnesium alloy has good vibration absorption properties, which is beneficial for engine vibration reduction and noise reduction. After molding, the magnesium alloy cover undergoes a micro-arc oxidation treatment to ensure its mechanical properties and corrosion resistance meet the requirements of the engine's operating environment.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the high-pressure fuel rail mounting hole 9, the oil cooler mounting hole 11, the fuel pipe mounting bracket 14, and several third mounting holes 15 are connected by a first reinforcing rib 10. A hexagonal second reinforcing rib 18 is provided on the cavity side of the cover plate body 1, and the second reinforcing rib 18 is connected to several mounting holes 15 of the cover plate body 1.

[0035] The first reinforcing rib 10 protrudes from the upper surface of the cover plate body 1 and is lower than the bearing surface of the bolt boss. The second reinforcing rib 18 is arranged inside the cavity and does not extend beyond the sealing surface of the cover plate body 1. The roots of the top surfaces of the first reinforcing rib 10 and the second reinforcing rib 18 are rounded to facilitate subsequent casting demolding and prevent stress concentration. The reinforcing ribs can increase the strength of the cover plate body 1 and reduce deformation.

[0036] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A diesel engine crankcase cover plate, characterized by: The cover plate body is made of magnesium alloy and is provided with a lubricating oil channel in communication with a main lubricating oil supply system of the engine. A sealing surface of the cover plate body combined with the crankcase is provided with a net structure, and a glue storage groove is arranged on the cavity side of the cover plate body. The lubricating oil channel is distributed in a branch shape inside the cover plate body to make lubricating oil enter and exit the oil cooler. A plurality of oil cooler mounting holes are arranged around the lubricating oil channel on the upper surface of the cover plate body. A plurality of third mounting holes are arranged on the cover plate body and correspond to the mounting holes arranged on the crankcase. The fuel high-pressure rail mounting hole, the oil cooler mounting hole, the fuel pipe mounting bracket and the third mounting holes are connected by the first reinforcing rib. The second reinforcing rib is arranged on the cavity side of the cover plate body and does not exceed the sealing surface of the cover plate body.

2. The diesel engine crankcase cover plate of claim 1, wherein: The first reinforcing rib protrudes from the upper surface of the cover plate body and is lower than the bolt boss pressure bearing surface.

3. The diesel engine crankcase cover plate of claim 1, wherein: The second reinforcing rib is arranged inside the cavity and does not exceed the sealing surface of the cover plate body. The first reinforcing rib and the second reinforcing rib are provided with a circular arc at the top surface root. The end surface of the lubricating oil channel is provided with a process hole. The fuel pipe mounting bracket is arranged on the outer surface of the cover plate body, and the first mounting hole is arranged on the fuel pipe mounting bracket. The fuel pipe is mounted at the first mounting hole.

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