Cylinder cover assembly of engine and engine
By designing the bottom hole of the injector bushing into a stepped cylindrical structure, physical isolation is achieved among the cylindrical section, arc transition section and sealing section. Different tools are used to process them separately, thus solving the problems of tool vibration and high processing cost in the existing technology and achieving higher processing accuracy and cost-effectiveness.
Patent Information
- Application Number
- CN202423257519.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-27
AI Technical Summary
The cylindrical section, arc transition section and sealing section of the existing injector bushing bottom hole are continuous structures, which leads to tool vibration, poor machining surface roughness and high machining costs.
The bottom hole of the injector bushing is designed as a stepped cylindrical structure, with the cylindrical section and the arc transition section located on the first step, and the sealing section located on the second step to achieve physical isolation. Different tools are used for rough and fine machining respectively.
The tool consumption is reduced, the processing cost is reduced, the processing surface roughness of the sealing section is improved, and the stability of the processing process is ensured.
Smart Images
Figure CN223469342U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of engine parts, and particularly relates to a cylinder head assembly of an engine and the engine. BACKGROUND
[0002] The statements herein merely provide background technology related to the utility model and do not necessarily constitute the prior art.
[0003] The fuel injector bushing and the cylinder head are key components in the fuel injection system of a vehicle engine, and the fuel injector bushing has been widely applied to various gasoline and diesel engines. As long as the engine adopts the fuel injection technology, the key component cannot be dispensed with, no matter whether it is a passenger car, a commercial vehicle or engineering machinery.
[0004] The fuel injector bushing forms a sealing structure by being attached to the bottom hole of the fuel injector bushing to prevent water in the water cavity of the cylinder head from leaking into the engine combustion chamber. The bottom hole of the existing fuel injector bushing is a structure similar to a cylinder, which mainly consists of a three-section cylindrical section, an arc transition section and a sealing section. Among them, the cylindrical section and the arc transition section form a water cavity around the fuel injector bushing, and the machining precision and surface quality requirements thereof are relatively low; the sealing section is used to attach to the fuel injector bushing to form a sealing structure, and the machining precision and roughness requirements thereof are relatively high. The roughness of the machining surface of the sealing section is an important factor affecting the sealing effect of the cylinder head and the fuel injector bushing.
[0005] However, the existing fuel injector bushing and its related components have some technical problems:
[0006] (1) The cylindrical section, the arc transition section and the sealing section of the bottom hole of the existing fuel injector bushing are continuous structures; according to the water flow demand of the water cavity in the cylinder head, the blank / entity around the cylindrical section is an irregular and asymmetric structure. Therefore, during the machining process of the bottom hole of the fuel injector bushing, due to the irregular and asymmetric structure of the blank / entity around the cylindrical section, the cutting tool will be subjected to uneven radial forces in different directions and different sizes, which will cause the cutting tool to vibrate along the radial direction, and thus the roughness of the machining surface of the sealing section will be poor.
[0007] (2) Since the three-section components of the bottom hole of the existing fuel injector bushing are continuous structures, the cylindrical section, the arc transition section and the sealing section, which have different machining precision requirements, need to be machined by the same cutting tool. Therefore, when the cylindrical section and the arc transition section are machined, the cutting edge of the cutting tool is in a normal state; when the sealing section is machined, the cutting edge of the cutting tool may have reached a failure state in advance, and the cutting tool cannot be used any more and needs to be replaced with a new one. At the same time, when the sealing section is machined, the cutting edge of the cutting tool will be subjected to uneven radial forces, which will accelerate the failure of the cutting tool and result in high consumption of the cutting tool and high machining cost. CONTENT OF THE UTILITY MODEL
[0008] The utility model discloses a kind of cylinder head assemblies of engine, which can realize the physical isolation of the cylindrical section of the first step, the arc transition section and the sealing section of the second step in the bottom hole of injector bushing, so that the processing of two steps does not affect each other, to realize sub-region processing and reduce processing cost.
[0009] A cylinder head assembly of an engine, the cylinder head assembly comprising an injector bushing assembly and a cylinder head, the injector bushing assembly comprising an injector and an injector bushing;
[0010] The cylinder head is provided with an injector hole, and the injector is installed in the injector hole through the injector bushing; wherein the injector hole comprises an injector bushing upper hole and an injector bushing bottom hole.
[0011] The injector bushing bottom hole is a stepped cylindrical structure, comprising a cylindrical section, an arc transition section and a sealing section; wherein the cylindrical section and the arc transition section are located in the first step of the stepped cylindrical structure; the sealing section is located in the second step of the stepped cylindrical structure; the first step is located above the second step.
[0012] As a further technical solution, the injector bushing upper hole is a special-shaped cavity structure.
[0013] As a further technical solution, the injector bushing upper hole and the injector bushing bottom hole are an integral through-hole.
[0014] As a further technical solution, the top and bottom of the injector bushing are tightly attached to the inside of the cylinder head, and the space where the injector bushing is not tightly attached to the inside of the cylinder head forms a cylinder head water cavity.
[0015] As a further technical solution, the injector bushing and the sealing section of the injector bushing bottom hole are interference fit, for the sealing connection of the injector bushing at the bottom of the cylinder head.
[0016] As a further technical solution, the maximum diameter of the sealing section in the second step is less than the maximum diameter of the cylindrical section and the arc transition section in the first step; the sinking distance of the second step compared to the height position of the first step is between the maximum radius difference and the maximum diameter difference of the sealing section in the second step and the cylindrical section and the arc transition section in the first step.
[0017] As a further technical solution, the roughness of the outer surface of the cylindrical section and the arc transition section is greater than the roughness of the outer surface of the sealing section.
[0018] As a further technical solution, the outer edge of the top of the injector bushing is provided with a square chamfer.
[0019] As a further technical scheme, the oil injector comprises a first oil injection section, a gradual change section and a second oil injection section; the diameter of the first oil injection section is larger than that of the second oil injection section, and an oil injection nozzle is arranged at the end of the second oil injection section.
[0020] An engine comprising a cylinder head assembly; wherein the cylinder head assembly is any one of the above-mentioned cylinder head assemblies.
[0021] The beneficial effects of one or more of the above technical solutions are:
[0022] (1) In the utility model, the oil injector bushing bottom hole is a stepped cylindrical structure, comprising a cylindrical section, an arc transition section and a sealing section; wherein the cylindrical section and the arc transition section are located in the first step in the stepped cylindrical structure, the sealing section is located in the second step in the stepped cylindrical structure, and the first step is located above the second step. The cylindrical section and the arc transition section are no longer in the same layer structure with the sealing section, but are physically isolated. Therefore, when the sealing section is processed, it will not contact the irregular, asymmetric structure of the blank / entity around the cylindrical section, and will not be affected by uneven radial force, so that the tool is not easy to vibrate, the processing process is stable, and the roughness of the sealing section processing surface can be more easily ensured.
[0023] (2) After the cylindrical section, the arc transition section and the sealing section are physically isolated, the cylindrical section and the arc transition section, which have lower processing precision requirements, can be processed by rough machining tools, and the sealing section, which has higher processing precision requirements, can be processed by fine machining tools. The rough and fine machining tools are separated, which avoids the premature scrapping of the rough machining tool due to the failure of the fine machining tool, reduces the consumption of the rough machining tool; at the same time, because of the uneven radial force and the difficulty of vibration, the service life of the fine machining tool is greatly improved, and the consumption of the fine machining tool is reduced. Therefore, the consumption of the rough machining tool and the fine machining tool is reduced, which can effectively reduce the processing cost. BRIEF DESCRIPTION OF DRAWINGS
[0024] The drawings accompanying the specification of this application form a part of this application and serve to further provide a further understanding of the application, the illustrative embodiments of the application and its description serve to explain the application, but do not limit the application.
[0025] Figure 1 It is a general structure schematic diagram of the cylinder head assembly of the engine in the utility model embodiment.
[0026] Figure 2 It is a general structure schematic diagram of the oil injector bushing assembly and the cylinder head in the prior art.
[0027] Figure 3 It is a force schematic diagram of the tool when the oil injector bushing assembly is processed in the prior art.
[0028] In the figure, 1 is an oil injector, 11 is a first oil injection section, 12 is a gradual change section, 13 is a second oil injection section, 14 is an oil injection nozzle, 2 is an oil injector bushing, 3 is a cylinder head, 4 is an oil injector hole, 41 is an upper oil injector bushing hole, 42 is a bottom oil injector bushing hole, 421 is a cylindrical section, 422 is a circular arc transition section, 423 is a sealing section, 5 is a cylinder head water cavity, and 6 is a chamfer. DETAILED DESCRIPTION
[0029] The specific implementation of the embodiment will be described below with reference to the accompanying drawings.
[0030] As Figure 1 shown, the utility model discloses an engine cylinder head assembly.
[0031] An engine cylinder head assembly, the cylinder head assembly comprising an oil injector bushing assembly and a cylinder head, the oil injector bushing assembly comprising an oil injector 1 and an oil injector bushing 2;
[0032] The cylinder head 3 is provided with an oil injector hole 4, and the oil injector 1 is installed in the oil injector hole 4 through the oil injector bushing 2;Wherein, the oil injector hole 4 comprises an upper oil injector bushing hole 41 and a bottom oil injector bushing hole 42;
[0033] The bottom oil injector bushing hole 42 is a stepped cylindrical structure, comprising a cylindrical section 421, a circular arc transition section 422 and a sealing section 423;Wherein, the cylindrical section 421 and the circular arc transition section 422 are located in the first step of the stepped cylindrical structure;The sealing section 423 is located in the second step of the stepped cylindrical structure;The first step is located above the second step.
[0034] As Figure 2 , Figure 3 shown, the cylindrical section, the circular arc transition section and the sealing section of the existing oil injector bushing bottom hole are continuous structures, and such a continuous structure design is difficult to guarantee the machining surface roughness of the oil injector bushing bottom hole at the sealing section;At the same time, the cylindrical section, the circular arc transition section and the sealing section all need to be machined by using the same cutter, and when the sealing section is machined, the cutting edge of the cutter will receive uneven radial force, accelerating the failure of the cutter. In view of this, the oil injector bushing assembly and the cylinder head are improved as Figure 1 shown, so that the cylindrical section of the first step, the circular arc transition section and the sealing section of the second step in the oil injector bushing bottom hole can be physically isolated, that is, the machining processes of the two steps do not affect each other, realizing regional machining and reducing machining cost. In order to facilitate the understanding of the technical scheme of the utility model, the specific details of the oil injector bushing assembly and the cylinder head in the utility model will be further explained and described below.
[0035] As Figure 1As shown, the oil injector hole 4 includes an oil injector bushing upper hole 41 and an oil injector bushing bottom hole 42; wherein the oil injector bushing upper hole 41 is a special-shaped cavity structure, and the oil injector bushing upper hole 41 and the oil injector bushing bottom hole 42 are an integral through-hole. Therefore, the oil injector hole 4 is a through-hole on the cylinder head 3 for mounting the oil injector bushing 2; wherein the cylinder head 3 is a main part of the engine, and its main function is to seal the cylinder, together with the piston and the like to form a combustion space of the engine, and to bear high-temperature and high-pressure combustion gas during the operation of the engine.
[0036] The top and bottom of the oil injector bushing 2 are tightly attached to the inside of the cylinder head 3, and the space where the oil injector bushing 2 is not tightly attached to the inside of the cylinder head 3 forms a cylinder head water cavity 5; wherein the cylinder head water cavity 5 is also called a cooling water cavity, and is mainly used for cooling the cylinder head 3. Specifically, the cylinder head water cavity 5 surrounds the part of the cylinder head 3 that needs to be cooled, and the excess heat absorbed by the cylinder head 3 is transferred away through the flow of the cooling medium (usually water or coolant) in the water cavity.
[0037] Further, the oil injector bushing 2 is another main part of the engine, and is mainly used to isolate the oil injector 1 from the outside world, such as the cylinder head water cavity 5. The oil injector 1 includes a first oil injection section 11, a gradual change section 12 and a second oil injection section 13, and is mainly used for fuel injection; wherein the diameter of the first oil injection section 11 is greater than that of the second oil injection section 13, and an oil injection nozzle 14 is arranged at the end of the second oil injection section 13. Specifically, the oil injector bushing 2 is connected and sealed at the bottom of the cylinder head 3 by interference fit with the sealing section 423 of the oil injector bushing bottom hole 42. At the same time, a square chamfer 6 is arranged at the outer edge of the top of the oil injector bushing 2 to realize the sealed connection of the oil injector bushing 2 at the top of the cylinder head 3, thereby ensuring the sealing effect.
[0038] As shown in the drawings, Figure 1 The oil injector bushing bottom hole 42 of the utility model is a stepped cylindrical structure, and the first step is located above the second step. Specifically, the maximum diameter of the sealing section 423 in the second step is smaller than the maximum diameter of the cylindrical section and the circular arc transition section in the first step. At the same time, the sinking distance of the second step compared to the height position of the first step is between the maximum radius difference and the maximum diameter difference of the sealing section in the second step and the cylindrical section and the circular arc transition section in the first step.
[0039] Preferably, in the embodiment, the maximum diameter of the sealing section 423 in the second step is set to be less than the maximum diameter of the cylindrical section 421 and the circular-arc transition section 422 in the first step by 0.6 mm or more; at the same time, the sinking distance of the second step relative to the height position of the first step is set to be between 0.3 mm and 0.5 mm (assuming that the maximum radius difference between the sealing section 423 in the second step and the cylindrical section 421 and the circular-arc transition section 422 in the first step is 0.3 mm, and the maximum diameter difference between the sealing section 423 in the second step and the cylindrical section 421 and the circular-arc transition section 422 in the first step is 0.5 mm). Thus, on the basis of achieving the physical isolation of the first step and the second step, when the oil injector bushing bottom hole 42 is processed, on the one hand, two different tools can be used to process different regions of different steps, that is, the cylindrical section and the circular-arc transition section with lower processing precision requirements can be processed by using a rough machining tool, and the sealing section with higher processing precision requirements can be processed by using a fine machining tool; on the other hand, the diameter of the fine machining tool (the maximum diameter of the sealing section) is less than the diameter of the rough machining tool (the diameter of the cylindrical section) by 0.6 mm (0.3 mm in the radial direction) or more, so that the fine machining tool does not contact the irregular and asymmetric structure of the blank / entity around the cylindrical section during the processing, and thus is not affected by the uneven radial force, is not easy to vibrate, the processing process is stable, and the roughness of the sealing section can be more easily ensured, the tool consumption is prevented, and the cost is reduced. Thus, it is easy to make the roughness of the sealing section 423 better than that of the cylindrical section 421 and the circular-arc transition section 422; specifically, the roughness of the cylindrical section 421 and the circular-arc transition section 422 is large, that is, the roughness of the cylindrical section 421 and the circular-arc transition section 422 is usually Ra(6.3-12.5), and the roughness of the sealing section 423 is usually Ra(0.8-1.6). At the same time, the design of the circular-arc transition section 422 can also be used to further reduce the concentrated stress.
[0040] In addition, the utility model discloses an engine, including cylinder cover subassembly, wherein, the cylinder cover subassembly is the cylinder cover subassembly disclosed in above-mentioned embodiment, therefore, the engine with this cylinder cover subassembly also has all above-mentioned technical effects, here, do not repeat again.
[0041] The above describes the specific embodiments of the utility model in combination with the drawings, but is not the limitation of the protection scope of the utility model, and those skilled in the art should understand that various modifications or deformations made by those skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.
Claims
1. A cylinder head assembly for an engine, characterized by, The cylinder head assembly comprises an oil injector bushing assembly and a cylinder head (3), the oil injector bushing assembly comprises an oil injector (1) and an oil injector bushing (2); The cylinder head (3) is provided with an oil injector hole (4), the oil injector (1) is installed in the oil injector hole (4) through the oil injector bushing (2); wherein the oil injector hole (4) comprises an oil injector bushing upper hole (41) and an oil injector bushing bottom hole (42); The oil injector bushing bottom hole (42) is a stepped cylindrical structure, comprising a cylindrical segment (421), an arc transition segment (422) and a sealing segment (423); wherein the cylindrical segment (421) and the arc transition segment (422) are located in the first step in the stepped cylindrical structure; the sealing segment (423) is located in the second step in the stepped cylindrical structure; the first step is located above the second step.
2. An engine cylinder head assembly as claimed in claim 1, wherein The oil injector bushing upper hole (41) is a special-shaped cavity structure.
3. An engine cylinder head assembly as claimed in claim 1, wherein The oil injector bushing upper hole (41) and the oil injector bushing bottom hole (42) are integral through holes.
4. An engine cylinder head assembly as claimed in claim 1, wherein The top and bottom of the oil injector bushing (2) are tightly attached to the inside of the cylinder head (3), and the space where the oil injector bushing (2) is not tightly attached to the inside of the cylinder head (3) forms a cylinder head water cavity (5).
5. An engine cylinder head assembly as set forth in claim 1 wherein, The oil injector bushing (2) is in interference fit with the sealing segment (423) of the oil injector bushing bottom hole (42), which is used for the sealing connection of the oil injector bushing (2) at the bottom of the cylinder head (3).
6. An engine cylinder head assembly as set forth in claim 1 wherein, The maximum diameter of the sealing segment (423) in the second step is smaller than the maximum diameter of the cylindrical segment (421) and the arc transition segment (422) in the first step; the sinking distance of the second step compared to the height position of the first step is between the maximum radius difference and the maximum diameter difference of the sealing segment (423) in the second step and the cylindrical segment (421) and the arc transition segment (422) in the first step.
7. An engine cylinder head assembly as set forth in claim 1 wherein, The roughness of the outer surface of the cylindrical segment (421) and the arc transition segment (422) is greater than that of the outer surface of the sealing segment (423).
8. An engine cylinder head assembly as in claim 1 wherein, The outer edge of the top of the oil injector bushing (2) is provided with a square chamfer (6).
9. An engine cylinder head assembly as in claim 1 wherein, The oil injector (1) comprises a first oil injection segment (11), a gradual change segment (12) and a second oil injection segment (13); the diameter of the first oil injection segment (11) is greater than that of the second oil injection segment (13), and an oil injection nozzle (14) is arranged at the end of the second oil injection segment (13).
10. An engine comprising a cylinder head assembly, characterized by, The cylinder head assembly is the cylinder head assembly according to any one of claims 1 to 9.