Oil injector assembly structure and diesel engine

Abstract

The fuel injector assembly structure comprises a fuel injector bush assembled on a cylinder cover, a fuel injector is arranged in the fuel injector bush, the fuel injector bush comprises a barrel-shaped body, a conical surface is arranged on the outer side of one end of the barrel-shaped body, and the other end of the barrel-shaped body is provided with an oil inlet and an oil outlet. The conical surface is in contact with the conical matching surface to form conical surface sealing, and the conical matching surface is arranged on the cylinder cover; the end, provided with the conical face, of the oil sprayer bush is pressed into the cylinder cover, the cylinder cover is in interference fit with the oil sprayer bush, and the conical face seal is located on the upper portion of the interference fit position. According to the fuel injector bush, the fuel injector bush is assembled on the cylinder cover in an interference fit and conical surface sealing mode, the sealing reliability of the fuel injector is guaranteed through the assembling mode, the machining technology of the fuel injector bush is simplified, the raw material cost and the machining cost of the fuel injector bush are reduced, and the actual use requirement is met; and the cost of the diesel engine is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel engines, in particular to an injector assembly structure and a diesel engine. Background Art

[0002] In the field of medium-speed diesel engines, a separate injector bushing is generally used at the connection between the injector and the cylinder head. The injector bushing is in contact with the cylinder head water chamber 7, which is used to isolate the injector from direct contact with cooling water, so that when the injector is replaced, water can be prevented from flowing into the cylinder. At the same time, since the injector bushing is a thin-walled part, heat exchange can be carried out between the water chamber 7 and the injector, which has a cooling effect on the injector.

[0003] In the prior art, there are generally two assembly methods between the injector bushing and the cylinder head: interference fit and thread fit. Figure 1 , the injector bushing 1 is inserted into the cylinder head 2 until there is an interference fit between the cylinder head fire surface and the cylinder head 2. After the injector 6 is installed, the injector 6 is pressed by the clamping bolt and the clamping block; for threaded assembly, refer to Figure 2 The injector bushing 1 is screwed into the cylinder head 2 through threads, and the end face of the injector bushing 1 is flush with the fire surface of the cylinder head.

[0004] However, whether it is threaded assembly or interference assembly, the assembly outer diameter of the injector bushing is quite different from the maximum outer diameter. When processing, solid bar material must be used for whole processing, such as Figure 3 As shown, it is relatively wasteful both in terms of materials and processing.

[0005] In addition, since the injector bushing in the prior art extends to the fire surface and is flush with the fire surface, the injector bushing is in direct contact with the combustion chamber, causing the bushing to be heated greatly. If it is a threaded connection, it may be difficult to remove the injector bushing after a certain period of time. If it is an interference connection, due to the difference in thermal expansion between the injector material and the cylinder head material, higher material requirements are imposed. Otherwise, when the injector is pulled out, the injector bushing will be pulled out as well. Utility Model Content

[0006] In view of the above-mentioned deficiencies, the technical problem to be solved by the utility model is: to provide an injector assembly structure and a diesel engine, so that the injector bushing is assembled on the cylinder head by means of interference fit and conical surface sealing, thereby ensuring the sealing reliability of the injector, simplifying the processing technology of the injector bushing, reducing the raw material and processing costs of the injector bushing, and meeting actual use needs.

[0007] In order to solve the above technical problems, the technical solution of the utility model is:

[0008] A fuel injector assembly structure comprises a fuel injector bushing assembled on a cylinder head, a fuel injector is arranged in the fuel injector bushing, the fuel injector bushing comprises a cylindrical body, a conical surface is arranged on the outer side of one end of the cylindrical body, the conical surface forms a conical surface seal by contacting with a conical matching surface, and the conical matching surface is arranged on the cylinder head; the end of the fuel injector bushing having the conical surface is pressed into the cylinder head, the cylinder head and the fuel injector bushing are interference fit, and the conical surface seal is located at the upper part of the interference fit position.

[0009] Preferably, the assembly structure further comprises an injector pressing sleeve, the injector pressing sleeve is arranged at the top end of the injector bushing, and the injector pressing sleeve is connected to the cylinder head.

[0010] Preferably, a avoidance structure is provided on the outer side of one end of the cylindrical body where the injector pressing sleeve is provided.

[0011] Preferably, the injector pressing sleeve is T-shaped, and the top end of the injector pressing sleeve is arranged on the outside of the injector.

[0012] Preferably, a sealing ring is provided between the injector pressing sleeve and the injector bushing and / or between the injector bushing and the injector.

[0013] Preferably, a fastening assembly is provided between the top end of the injector and the cylinder head.

[0014] Preferably, the fastening assembly includes a pressing block sleeved on the top of the injector and a fastening bolt, and the fastening bolt connects the pressing block and the cylinder head.

[0015] Preferably, the injector bushing is made of a stainless steel pipe.

[0016] Preferably, the wall thickness of the injector bushing is greater than or equal to 2.5 mm.

[0017] A diesel engine comprises the above-mentioned fuel injector assembly structure.

[0018] After adopting the above technical solution, the beneficial effects of the utility model are:

[0019] Due to the fuel injector assembly structure and diesel engine of the utility model, the fuel injector assembly structure includes a fuel injector bushing assembled on the cylinder head, the fuel injector is arranged in the fuel injector bushing, the fuel injector bushing includes a cylindrical body, a conical surface is arranged on the outer side of one end of the cylindrical body, the conical surface forms a conical surface seal by contacting with the conical mating surface, and the conical mating surface is arranged on the cylinder head; the end of the fuel injector bushing with the conical surface is pressed into the cylinder head, the cylinder head and the fuel injector bushing are interference fit, and the conical surface seal is located at the upper part of the interference fit position. As can be seen from the above, the fuel injector bushing of the utility model adopts the interference fit plus conical surface seal method to be assembled on the cylinder head, which ensures the sealing reliability of the fuel injector, simplifies the processing technology of the fuel injector bushing, reduces the raw material and processing cost of the fuel injector bushing, and meets the actual use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the prior art when the injector bushing is fitted by interference fit;

[0021] Figure 2 It is a structural schematic diagram of the injector bushing in the prior art when it is assembled by thread;

[0022] Figure 3 It is a schematic diagram of the processing of the injector bushing in the prior art;

[0023] Figure 4 It is a structural schematic diagram of the fuel injector assembly structure in the utility model;

[0024] Figure 5 yes Figure 4 A local enlarged schematic diagram of the middle A;

[0025] Figure 6 It is a schematic diagram of the processing of the injector bushing in the utility model;

[0026] In the figure: 1-injector bushing, 2-cylinder head, 3-pressure block, 4-fastening bolts, 5-injector sleeve, 6-injector, 7-water chamber, 8-sealing ring, 9-conical seal, 10-interference fit. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0029] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0030] like Figure 4 and Figure 5 As shown, according to an embodiment of the first aspect of the utility model, the injector assembly structure includes an injector bushing 1 and an injector pressing sleeve 5, wherein the injector bushing 1 is assembled on the cylinder head 2, and the injector bushing 1 accommodates the injector 6, wherein the injector pressing sleeve 5 is arranged at the top end of the injector bushing 1, and the injector pressing sleeve 5 is connected to the cylinder head 2. Specifically, the injector pressing sleeve 5 can be threadedly connected to the cylinder head 2.

[0031] The fuel injector bushing 1 in the utility model comprises a cylindrical body, and a conical surface is arranged on the outer side of one end of the cylindrical body. Figure 6 The conical surface is in contact with the conical mating surface to form a conical surface seal 9. The conical mating surface is provided on the cylinder head 2. The end of the injector bushing 1 having the conical surface is pressed into the cylinder head 2. The injector bushing 1 and the cylinder head 2 are interference fit, and the conical surface seal 9 is provided at the upper part of the interference fit 10 position. Figure 5 That is, the fuel injector bushing 1 of the utility model is assembled on the cylinder head 2 by means of interference fit 10 + cone seal 9, which ensures the reliability of the seal and prevents water from flowing into the cylinder when the fuel injector 6 is disassembled.

[0032] Because the injector bushing 1 and the cylinder head 2 of the utility model adopt the assembly method of interference fit 10+conical seal 9, in terms of structure, the injector bushing 1 is not in direct contact with the combustion chamber, thereby reducing the requirements for the material of the injector bushing 1, simplifying the processing technology of the injector bushing 1, and reducing the processing and material costs; it also solves the disassembly and assembly problems such as biting caused by threaded connection; this assembly method allows the injector 6 to not be directly pressed on the injector bushing 1, and when the injector 6 is subjected to the alternating force in the cylinder, the influence on the injector bushing 1 is small, and it is not easy to cause cavitation; the injector 6 does not need to use the injector bushing 1 to set the height.

[0033] like Figure 6 As shown, in some embodiments of the utility model, a avoidance structure is provided at the other end of the tubular body of the injector bushing 1. Specifically, a avoidance structure is provided at the outer side of one end of the injector bushing 1 where the injector pressure sleeve 5 is provided. The avoidance structure is an inwardly retracted inclined surface. By providing the avoidance structure, assembly is facilitated and the layout is optimized.

[0034] like Figure 6 As shown, in some embodiments of the present invention, the injector bushing 1 may be made of a stainless steel pipe, and the wall thickness of the injector bushing 1 is greater than or equal to 2.5 mm.

[0035] The use of steel pipes to process the injector bushing 1 can ensure the overall hardness, unlike the situation where the raw material is a solid bar and the core of the material cannot be tempered. In addition, the assembly method adopted by the utility model makes the difference between the installation diameter and the maximum diameter of the injector bushing 1 smaller, and only the two ends of the steel pipe need to be processed, so the raw material and processing costs are low; at the same time, the injector bushing 1 is a thin-walled part with fewer processing parts, which further reduces the processing cost. At the same time, the assembly method adopted by the utility model can make the injector bushing 1 thinner. For example, the thinnest of ordinary injector bushings 1 is 4.5mm; the utility model can achieve a thickness of 2.5mm, which greatly reduces the overall weight.

[0036] like Figure 4 As shown, in some embodiments of the utility model, the injector sleeve 5 is T-shaped, the top end of the injector bushing 1 is arranged on the outside of the injector 6, and a sealing ring 8 is arranged between the injector sleeve 5 and the injector bushing 1 and / or between the injector sleeve 5 and the injector 6, thereby improving the sealing performance of the injector 6.

[0037] like Figure 4 As shown, in some embodiments of the utility model, a fastening assembly is arranged between the top end of the injector 6 and the cylinder head 2. A preferred embodiment is that the fastening assembly includes a pressure block 3 and a fastening bolt 4 which are sleeved on the top end of the injector 6. The fastening bolt 4 connects the pressure block 3 and the cylinder head 2. Under the action of the fastening assembly, the injector 6 is reliably mounted on the injector bushing 1 and the cylinder head 2.

[0038] According to an embodiment of the second aspect of the utility model, the diesel engine comprises the injector assembly structure of the first aspect of the utility model.

[0039] Since the diesel engine of the present utility model adopts the fuel injector assembly structure of the first aspect of the present utility model, the cost of processing and assembly is reduced, and the sealing of the fuel injector 6 is guaranteed, thereby ensuring the performance of the diesel engine.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications made within the spirit and principles of the present invention, improvements to the assembly structure of the injector, etc., shall be included in the protection scope of the present invention.

Claims

1. A fuel injector assembly structure, comprising a fuel injector bushing assembled on a cylinder head, wherein a fuel injector is arranged in the fuel injector bushing, characterized in that: The injector bushing comprises a cylindrical body, a conical surface is arranged on the outer side of one end of the cylindrical body, the conical surface forms a conical surface seal by contacting with a conical matching surface, and the conical matching surface is arranged on the cylinder head; One end of the injector bushing having the conical surface is pressed into the cylinder head, the cylinder head and the injector bushing are interference fit, and the conical surface seal is located at the upper part of the interference fit position.

2. The fuel injector assembly structure according to claim 1, characterized in that: The assembly structure also includes an injector pressing sleeve, which is arranged on the top end of the injector bushing and connected to the cylinder head.

3. The fuel injector assembly structure according to claim 2, characterized in that: An avoidance structure is arranged on the outer side of one end of the cylindrical body where the injector pressing sleeve is arranged.

4. The fuel injector assembly structure according to claim 2, characterized in that: The fuel injector pressing sleeve is T-shaped, and the top end of the fuel injector pressing sleeve is arranged on the outside of the fuel injector.

5. The fuel injector assembly structure according to claim 4, characterized in that: A sealing ring is arranged between the injector pressing sleeve and the injector bushing and / or between the injector bushing and the injector.

6. The fuel injector assembly structure according to claim 1, characterized in that: A fastening assembly is arranged between the top end of the fuel injector and the cylinder cover.

7. The fuel injector assembly structure according to claim 6, characterized in that: The fastening assembly comprises a pressing block sleeved on the top of the injector and a fastening bolt, wherein the fastening bolt connects the pressing block and the cylinder cover.

8. The fuel injector assembly structure according to claim 1, characterized in that: The injector bushing is made of a stainless steel pipe.

9. The fuel injector assembly structure according to claim 1, characterized in that: The wall thickness of the injector bushing is greater than or equal to 2.5 mm.

10. A diesel engine, characterized in that: The invention comprises the fuel injector assembly structure as claimed in any one of claims 1 to 9.

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