Cylinder cover oil return structure of diesel engine

Abstract

The utility model discloses a diesel engine cylinder cover oil return structure which comprises an oil injector oil return groove formed in a cylinder cover and further comprises a high-pressure connecting pipe oil duct formed in one side of the cylinder cover. The first oil duct and the second oil duct are formed in the front face of the cylinder cover. The second oil duct and the third oil duct are formed in one side of the cylinder cover; the oil sprayer penetrates through the top of the cylinder cover; provided is a fuel injector O-shaped ring. The fuel injector is simple in structure and low in cost, economical efficiency and emission performance can be well improved on the basis that the dynamic performance of an original engine is met, redundant diesel oil is returned to the fuel tank through the high-pressure connecting pipe oil duct, the first oil duct, the second oil duct, the first fuel pipe and the second fuel pipe through the fuel injector oil return groove, fuel consumption is reduced, and the fuel injector oil return groove is suitable for large-scale popularization and application. Therefore, the problems of idle speed rise, insufficient combustion and fuel consumption increase are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of engine fuel technology. Specifically, this utility model relates to a diesel engine cylinder head oil return structure. Background Technology

[0002] The main function of the fuel injector return line in a diesel engine is to remove excess diesel fuel leaking from the gap between the injector needle valve and the needle valve body, and to allow it to flow back to the fuel tank via the return line. The working principle of the fuel injector return line in a diesel engine's fuel supply system is as follows: The injector receives injection pulse signals from the ECU (Electronic Control Unit) to precisely control the fuel injection quantity. When the injector is working, there is a certain gap between the needle valve and the needle valve body, and a small amount of diesel fuel may leak out through this gap. This leaked diesel fuel flows back to the fuel tank through the return line to reduce fuel consumption.

[0003] The impact of fuel return on engine operation: The main function of the fuel return line is to return excess diesel fuel to the fuel tank, thereby reducing fuel consumption. If the fuel return line becomes blocked, it will lead to excessively high fuel pressure, resulting in a significantly higher idle speed, incomplete combustion, and increased fuel consumption. Therefore, keeping the fuel return line unobstructed is crucial for the normal operation of the engine. Utility Model Content

[0004] This invention provides a diesel engine cylinder head oil return structure, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a diesel engine cylinder head oil return structure, including an injector oil return groove opened inside the cylinder head, and a high-pressure connecting pipe oil passage opened on one side of the cylinder head.

[0006] The first oil passage is located on the front side of the cylinder head;

[0007] The second oil passage is located on one side of the cylinder head;

[0008] A fuel injector that extends through the top of the cylinder head;

[0009] Injector O-ring, the injector O-ring is sleeved on the outer wall of the injector, and the outer ring is in contact with the injector return groove;

[0010] A high-pressure connecting pipe is provided at one end of the first oil passage, and one end is connected to the oil inlet of the injector.

[0011] A high-pressure connecting pipe O-ring, wherein the high-pressure connecting pipe O-ring is fitted onto the outer wall of the high-pressure connecting pipe;

[0012] The first oil pipe is connected to one end of the high-pressure connecting pipe;

[0013] The second oil pipe is connected to one end of the second oil passage.

[0014] Preferably, the injector return groove is controlled by a height dimension B=10mm, a diameter dimension D1=26mm, and a width dimension L=0.6mm.

[0015] Preferably, the diameter of the high-pressure connecting pipe oil passage is D3=15mm. The diameter of the high-pressure connecting pipe is smaller than the diameter D3=15mm, meaning that the high-pressure connecting pipe oil passage can be used as an oil circuit channel.

[0016] The beneficial effects of adopting the above technical solutions are:

[0017] 1. This utility model has a simple structure and low cost. While meeting the power performance of the original engine, its economy and emissions can be greatly improved.

[0018] 2. This utility model uses the injector return oil groove to return excess diesel fuel to the fuel tank through the high-pressure connecting pipe oil passage, the first oil passage, the second oil passage and the first oil pipe and the second oil pipe, so as to reduce fuel consumption and avoid the problems of increased idling speed, incomplete combustion and increased fuel consumption. Attached Figure Description

[0019] Figure 1 This utility model provides an overall structural schematic diagram;

[0020] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0021] Figure 3 This is an assembly sectional view of the present invention;

[0022] in:

[0023] 1. Cylinder head; 2. Injector return groove; 3. High-pressure connecting pipe oil passage; 4. First oil passage; 5. Second oil passage; 6. Injector; 7. Injector O-ring; 8. High-pressure connecting pipe; 9. High-pressure connecting pipe O-ring; 10. First oil pipe; 11. Second oil pipe. Detailed Implementation

[0024] 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.

[0025] like Figures 1 to 3As shown, this utility model is a diesel engine cylinder head oil return structure. It has a simple structure and low cost. While meeting the original engine's power performance, its economy and emissions can be greatly improved.

[0026] Specifically, such as Figures 1 to 3 As shown, it includes an injector return groove 2 opened inside the cylinder head 1, and a high-pressure connecting pipe oil passage 3, which is opened on one side of the cylinder head 1.

[0027] First oil passage 4, first oil passage 4 is opened on the front of cylinder head 1;

[0028] The second oil passage 5 is located on one side of the cylinder head 1;

[0029] Injector 6 extends through the top of cylinder head 1;

[0030] Injector O-ring 7 is fitted on the outer wall of injector 6, and the outer ring is in contact with the injector return groove 2.

[0031] High-pressure connecting pipe 8 is located at one end of the first oil passage 3, and one end is connected to the oil inlet of the injector 6.

[0032] High-pressure connecting pipe O-ring 9, the high-pressure connecting pipe O-ring 9 is sleeved on the outer wall of the high-pressure connecting pipe 8;

[0033] First oil pipe 10, first oil pipe 10 is connected to one end of high pressure connecting pipe 8;

[0034] The second oil pipe 11 is connected to one end of the second oil passage 5.

[0035] The injector return groove 2 is controlled by a height dimension B=10mm, a diameter dimension D1=26mm, and a width dimension L=0.6mm.

[0036] The diameter of the high-pressure connecting pipe oil passage 3 is D3=15mm, and the diameter of the high-pressure connecting pipe 8 is smaller than the diameter D3=15mm, that is, the high-pressure connecting pipe oil passage 3 can be used as an oil passage.

[0037] The specific working method is described below using specific embodiments: Example 1

[0038] Injector 6 seals diesel fuel through injector O-ring 7; high-pressure connecting pipe 8 seals diesel fuel through high-pressure connecting pipe O-ring 9.

[0039] The main function of the injector return groove 2 is to return excess diesel fuel to the fuel tank through the high-pressure connecting pipe oil passage 3, the first oil passage 4, the second oil passage 5, the first oil pipe 10, and the second oil pipe 11, so as to reduce fuel consumption.

[0040] If the fuel return line of injector 6 becomes blocked, it will cause excessively high fuel pressure, which will significantly increase the idle speed, incomplete combustion, and increased fuel consumption. Therefore, keeping the fuel return line unobstructed is crucial for the normal operation of the engine.

[0041] 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 by adopting 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 cylinder head oil return structure, including an injector return mechanism located inside the cylinder head (1). Oil tank (2), characterized in that: Also includes: High-pressure connecting pipe oil passage (3), the high-pressure connecting pipe oil passage (3) is opened on one side of the cylinder head (1); The first oil passage (4) is located on the front side of the cylinder head (1); The second oil passage (5) is located on one side of the cylinder head (1); Injector (6), the injector (6) extends through the top of the cylinder head (1); Injector O-ring (7), the injector O-ring (7) is fitted on the outer wall of the injector (6), and the outer ring is in contact with the injector return groove (2); High-pressure connecting pipe (8), the high-pressure connecting pipe (8) is located at one end of the first oil passage (4), and one end is connected to the oil inlet of the injector (6); High-pressure connecting pipe O-ring (9), the high-pressure connecting pipe O-ring (9) is sleeved on the outer wall of the high-pressure connecting pipe (8); The first oil pipe (10) is connected to one end of the high-pressure connecting pipe (8); The second oil pipe (11) is connected to one end of the second oil passage (5).

2. The diesel engine cylinder head oil return structure according to claim 1, characterized in that: The injector return groove (2) is controlled by a height dimension B=10mm, a diameter dimension D1=26mm, and a width dimension L=0.6mm.

3. The diesel engine cylinder head oil return structure according to claim 1, characterized in that: The diameter of the high-pressure connecting pipe oil passage (3) is D3=15mm, and the diameter of the high-pressure connecting pipe (8) is smaller than the diameter D3=15mm, that is, the high-pressure connecting pipe oil passage (3) can be used as an oil passage.

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