Cylinder head, method of manufacturing the same, and engine

Abstract

The application provides a cylinder cover, a manufacturing method thereof and an engine. The cylinder cover comprises a cylinder cover body, an oil injector and an oil injector bushing; a positioning structure and a connecting structure are arranged between the oil injector bushing and the cylinder cover body, the positioning structure and the connecting structure are arranged at intervals along the extension direction of the oil injector bushing, and the oil injector bushing and the cylinder cover body are connected through the positioning structure and the connecting structure. The manufacturing method inserts the oil injector bushing into a core assembly process to obtain the cylinder cover through insert casting; and the engine comprises the cylinder cover. The cylinder cover, the manufacturing method thereof and the engine improve the sealing performance of the cylinder cover and reduce the liquid leakage failure rate of the cylinder cover; the manufacturing method of the cylinder cover can reduce the processing workload, save the manual process after processing, reduce the processing cost and save the labor cost. Through assembling the cylinder cover in the engine, the performance of the engine can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, and particularly relates to a cylinder head, a manufacturing method thereof and an engine. BACKGROUND

[0002] The cylinder head is an important component of the engine, can seal the cylinder, form a combustion space, and bear high-temperature and high-pressure combustion gas.

[0003] In the prior art, the cylinder head comprises a cylinder head body, an oil injector bushing and an oil injector. The oil injector bushing is sleeved on the oil injector and plays a sealing role. There are mainly two manufacturing methods of the oil injector bushing: one is to press-fit the bushing after machining the oil injector bushing hole from the blank hole of the casting; the other is to directly cast a solid at the corresponding position of the oil injector, and then form the oil injector bushing through machining.

[0004] However, the finished product of the oil injector bushing has defects, and there is a problem of poor sealing, which causes the cylinder head to leak. SUMMARY

[0005] The present application provides a cylinder head, a manufacturing method thereof and an engine, which can reduce the probability of defects in the cylinder head, improve the sealing performance of the cylinder head, reduce the leakage problem, and improve the performance of the engine as a whole.

[0006] In a first aspect, the present application provides a cylinder head, comprising a cylinder head body, an oil injector and an oil injector bushing; the cylinder head body is provided with an oil injection port; the oil injector bushing is sleeved on at least part of the outside of the oil injector, the oil injector sleeved with the oil injector bushing is installed in the oil injection port, and the oil injector bushing is located between the cylinder head body and the oil injector.

[0007] The positioning structure and the connecting structure are arranged between the oil injector bushing and the cylinder head body, and the positioning structure and the connecting structure are arranged at intervals along the extension direction of the oil injector bushing. The oil injector bushing and the cylinder head body are connected through the positioning structure and the connecting structure.

[0008] In the above-mentioned cylinder head, optionally, the connecting structure has a plurality of connecting structures, and the plurality of connecting structures are arranged at intervals along the extension direction of the oil injector bushing.

[0009] At least one of the connecting structures is arranged close to the positioning structure.

[0010] In the above-mentioned cylinder head, optionally, the connecting structure comprises an embedding piece and an embedding groove, the embedding piece is arranged on one of the cylinder head body and the oil injector bushing, and the embedding groove is arranged on the other one of the cylinder head body and the oil injector bushing.

[0011] The embedding piece and the embedding groove are connected in an embedded manner.

[0012] In the cylinder head, optionally, the positioning structure comprises a positioning protrusion and a positioning groove, the positioning protrusion is arranged on the first end of the fuel injector bushing, the extending direction of the positioning protrusion is crossed with the extending direction of the fuel injector bushing, and the positioning groove is arranged on the cylinder head body.

[0013] The positioning protrusion is embedded in the positioning groove, and the positioning protrusion and the positioning groove jointly limit the movement of the fuel injector bushing along the axial direction of the fuel injector bushing relative to the cylinder head body.

[0014] In the cylinder head, optionally, the outer circumferential surface of the fuel injector bushing has at least two reserved portions, a gap is formed between each reserved portion and the cylinder head body, and at least one connecting structure is arranged between two adjacent reserved portions.

[0015] In the cylinder head, optionally, the wall thickness of the fuel injector bushing is greater than or equal to 1.2 mm and less than or equal to 1.7 mm, and / or the material of the fuel injector bushing comprises, but is not limited to, stainless steel, A3 steel and cast iron.

[0016] In a second aspect, the application provides a manufacturing method of a cylinder head, comprising:

[0017] providing a casting shell, a combined core and an initial fuel injector bushing, the combined core comprising a base core, a lower water jacket core, an upper water jacket core, a positioning core and an upper cover core.

[0018] installing the combined core and the initial fuel injector bushing in the casting shell and assembling the combined core and the initial fuel injector bushing; the initial fuel injector bushing is arranged on the base core, the lower water jacket core and the upper water jacket core are arranged around the outer circumferential surface of the initial fuel injector bushing, the positioning core is embedded in the sleeve cavity of the initial fuel injector bushing, and the upper cover core covers the top of the initial fuel injector bushing.

[0019] pouring liquid cast material into the casting shell, and waiting for the liquid cast material to solidify.

[0020] removing the combined core and the casting shell, and the solidified cast material forms a cylinder head body, and the initial fuel injector bushing is arranged in the cylinder head body.

[0021] trimming the initial fuel injector bushing to form a fuel injector bushing.

[0022] installing a fuel injector in the sleeve cavity of the initial fuel injector bushing, and the cylinder head body, the initial fuel injector bushing and the fuel injector jointly form a cylinder head.

[0023] In the manufacturing method of the cylinder head, optionally, the end of the initial fuel injector bushing is provided with an auxiliary positioning protrusion, and the base core is provided with a base groove matched with the auxiliary positioning protrusion of the initial fuel injector bushing.

[0024] trimming the initial fuel injector bushing, comprising: removing the auxiliary positioning protrusion of the initial fuel injector bushing to form a fuel injector bushing.

[0025] In the manufacturing method of the cylinder head, optionally, the lower water jacket core and the upper water jacket core have cavities corresponding to the reserved part of the initial fuel injector bushing; and the upper cover core is provided with an upper cover groove matched with the positioning protrusion of the initial fuel injector bushing.

[0026] In a third aspect, the application provides an engine comprising the cylinder head.

[0027] The cylinder head, the manufacturing method thereof and the engine provided by the application can realize the embedded connection of the fuel injector bushing and the cylinder head body by the embedded part and the embedded groove in the connecting structure, ensure the firm combination of the cylinder head body and the fuel injector bushing, improve the sealing property of the cylinder head, and reduce the liquid leakage failure rate of the cylinder head; the positioning protrusion and the positioning groove in the positioning structure can axially fix the fuel injector in the cylinder head body, ensure that the fuel injector does not rotate and does not move up and down during the machining process, and improve the stability of the cylinder head in the subsequent machining process. In addition, the fuel injector bushing can be made of a relatively cheap A3 steel or cast iron, and the material selection range of the fuel injector bushing is wider than that of other bushings, so that the production cost is reduced. The manufacturing method of the cylinder head can reduce the machining workload, save the post-machining manual process, reduce the machining cost and save the labor cost. The assembly of the cylinder head in the engine can improve the performance of the engine. The structure of the application and other purposes and beneficial effects thereof will be more obvious and easy to understand through the description of the preferred embodiments in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0029] Figure 1 The cylinder head cross-sectional view provided by the embodiments of the application;

[0030] Figure 2 The cylinder head manufacturing method group core process schematic view provided by the embodiments of the application;

[0031] Figure 3 The cylinder head manufacturing method flowchart schematic view provided by the embodiments of the application;

[0032] Figure 4 The fuel injector bushing structure schematic view of the cylinder head provided by the embodiments of the application;

[0033] Figure 5A positioning core schematic diagram of a cylinder head manufacturing method provided by the embodiment of the present application;

[0034] Figure 6 A partial schematic diagram of Figure 4 ;

[0035] Figure 7 A partial schematic diagram of Figure 2 ;

[0036] Explanation of reference signs:

[0037] 101: cylinder head body; 102: oil injector; 103: oil injector bushing;

[0038] 201: initial oil injector bushing; 202: connecting structure; 203: positioning structure; 204: reserved part;

[0039] 2011: fitting piece; 2012: fitting groove; 2013: positioning protrusion; 2014: positioning groove; 2015: auxiliary positioning protrusion; 2016: chassis groove;

[0040] 301: mold shell; 302: upper cover core; 303: upper water jacket core; 304: lower water jacket core; 305: chassis core; 306: positioning core;

[0041] 401: second positioning structure; 402: sand cleaning structure; 403: third positioning structure; 404: fourth positioning structure. DETAILED DESCRIPTION

[0042] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail because they would obscure the application in unnecessary detail. The following exemplary embodiments are described in connection with what is presented in the accompanying drawings, which are not necessarily drawn to scale. In the following description, like reference numerals refer to like elements unless the context clearly suggests otherwise.

[0043] First, the terms involved in the present application are explained:

[0044] Insert casting: insert casting is to insert the already shaped parts into the inside of the casting by casting method.

[0045] Sand core: a solid structure with a special shape made by mixing foundry sand, resin and some additives in a certain proportion, used to form the inner cavity, hole and part of the casting shape that cannot be sand blasted.

[0046] Core head: the end of the sand core is called the core head, which refers to the part of the sand core that extends out of the casting and does not contact the metal, serving to fix and position the sand core in the mold cavity.

[0047] The inventor of the present application found in practical research that the cylinder cover comprises a cylinder cover body, an oil injector and an oil injector bushing. The cylinder cover is provided with an oil injection port, the oil injector is located in the oil injection port, and the oil injector bushing is located between the cylinder cover body and the oil injector. In the related art, there are two methods of press fitting and machining for the conventional manufacturing method of the cylinder cover oil injector bushing structure. The oil injector bushing prepared by the press fitting method may have a problem of poor sealing between the oil injector bushing and the cylinder cover body, and leakage may occur. The oil injector bushing prepared by machining also has a defect problem, and may also have a problem of poor sealing. In addition, the cost of machining the bushing is high.

[0048] Therefore, the cylinder cover, the manufacturing method thereof and the engine provided in the embodiments of the present application can achieve the following effects. The positioning structure and the connecting structure are arranged between the oil injector and the cylinder cover body, and the connecting structures are arranged at intervals along the extension direction of the oil injector bushing. The oil injector bushing and the cylinder cover body can be connected by the embedded connection of the embedded part and the embedded groove in the connecting structure, so that the cylinder cover body and the oil injector bushing are firmly combined, the sealing performance of the cylinder cover is improved, and the liquid leakage failure rate of the cylinder cover is reduced. The oil injector is axially fixed in the cylinder cover body by the positioning protrusion and the positioning groove in the positioning structure, so that the oil injector does not rotate and does not move up and down during the machining process, and the stability of the cylinder cover in the subsequent machining process is improved. In addition, the material selection range of such an oil injector bushing is wider than that of other bushings, and relatively cheap A3 steel, cast iron and other materials can be selected, so that the production cost is reduced. At the same time, the manufacturing method of the cylinder cover can reduce the machining workload, save the post-machining manual process, reduce the machining cost and save the labor cost. By assembling the above-mentioned cylinder cover in the engine, the performance of the engine is improved.

[0049] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described in more detail below in combination with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference signs represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0050] Reference Figure 1 , Figure 2As shown in the first aspect, the embodiments of the present application provide a cylinder cover, comprising a cylinder cover body 101, an oil injector 102 and an oil injector bushing 103, the cylinder cover body 101 is provided with an oil injection port; the oil injector bushing 103 is sleeved on at least part of the outside of the oil injector 102, the oil injector 102 sleeved with the oil injector bushing 103 is installed in the oil injection port, and the oil injector bushing 103 is located between the cylinder cover body 101 and the oil injector 102.

[0051] Specifically, the cylinder cover is an important part of the engine, which is used to close the cylinder and form a combustion chamber. The oil injector bushing 103 is a matched part used to be sleeved on the outside of the oil injector 102 to achieve the effects of sealing, anti-wear and protection.

[0052] The positioning structure 203 and the connecting structure 202 are arranged between the oil injector bushing 103 and the cylinder cover body 101, the positioning structure 203 and the connecting structure 202 are arranged at intervals along the extension direction of the oil injector bushing 103, and the oil injector bushing 103 and the cylinder cover body 101 are connected through the positioning structure 203 and the connecting structure 202.

[0053] In a possible specific embodiment, the connecting structure 202 is arranged between the oil injector bushing 103 and the cylinder cover body 101. Figure 4 、 Figure 6 As shown, the connecting structure 202 has a plurality of connecting structures 202, and the plurality of connecting structures 202 are arranged at intervals along the extension direction of the oil injector bushing 103; at least one of the connecting structures 202 is arranged close to the positioning structure 203.

[0054] As a possible implementation, the connecting structure 202 can include an embedding piece 2011 and an embedding groove 2012, the embedding piece 2011 is arranged on one of the cylinder cover body 101 and the oil injector bushing 103, and the embedding groove 2012 is arranged on the other one of the cylinder cover body 101 and the oil injector bushing 103; the embedding piece 2011 and the embedding groove 2012 are embeddedly connected.

[0055] Specifically, the connecting structure 202 is used for the combination of the oil injector bushing 103 and the cylinder cover body 101, and the embedding piece 2011 and the embedding groove 2012 included therein can include a hobbing structure and an anti-rotation structure, so that the oil injector bushing 103 and the cylinder cover body 101 are closely combined through the texture, and the sealing performance is improved. Taking the hobbing structure as an example, the embedding piece can be a convex part on the hobbing structure, and the embedding groove can be a concave part on the hobbing structure, and the shapes of the convex part and the concave part are matched.

[0056] That is, the opposite surfaces of the oil injector bushing 103 and the cylinder head body 101 are provided with the hobbing structure, the protruding part in the hobbing structure of the surface of the oil injector bushing 103 forms the fitting part 2011, which is fitted with the fitting groove 2012 formed by the recessed part of the hobbing structure of the surface of the cylinder head body 101; or, the recessed part in the hobbing structure of the surface of the oil injector bushing 103 forms the fitting groove 2012, which is fitted with the fitting part 2011 formed by the protruding part of the hobbing structure of the surface of the cylinder head body 101.

[0057] The reserved part 204 is a smooth surface part, which is used for positioning and fitting the oil injector bushing 103 with the side surface of the upper water jacket core 303 and the lower water jacket core 304. The reserved part 204 can be divided into three sections, and a connecting structure 202 is arranged between each two adjacent sections, so as to ensure the positioning and connecting stability of the oil injector bushing 103 in the horizontal direction of the sand core.

[0058] As an implementable embodiment, the positioning structure 203 comprises a positioning protrusion 2013 and a positioning groove 2014, the positioning protrusion 2013 is arranged at the first end of the oil injector bushing 103, the extending direction of the positioning protrusion 2013 is crossed with the extending direction of the oil injector bushing 103, and the positioning groove 2014 is arranged on the cylinder head body 101.

[0059] The positioning protrusion 2013 is embedded in the positioning groove 2014, and the positioning protrusion 2013 and the positioning groove 2014 jointly limit the movement of the oil injector bushing 103 relative to the cylinder head body 101 in the axial direction of the oil injector bushing 103.

[0060] Specifically, the positioning protrusion 2013 can be a reverse conical structure, that is, the cross-sectional area of the positioning protrusion 2013 gradually decreases in the direction away from the oil injector bushing 103, and the end of the positioning protrusion 2013 away from the oil injector bushing 103 is a plane, thereby forming a structure similar to a reverse cone. In this way, the top end of the oil injector bushing 103 (i.e., the position of the positioning protrusion) and the cylinder head body 101 can be embedded, combined closely, and the oil injector bushing 103 will not move in the height direction during processing.

[0061] The positioning protrusion 2013 can be a flange arranged around the outer periphery of the oil injector bushing 103, which can surround the entire outer periphery of the oil injector bushing 103, that is, a complete annular structure; correspondingly, the positioning groove 2014 can be an annular groove surrounding the entire inner annular wall of the oil injection port of the cylinder head body 101. The positioning protrusion 2013 can also surround part of the outer periphery of the oil injector bushing 103, that is, a ring segment structure; correspondingly, the positioning groove 2014 can be an annular groove surrounding part of the inner annular wall of the oil injection port of the cylinder head body 101.

[0062] In some embodiments, the extending direction of the positioning protrusion 2013 can be perpendicular to the extending direction of the oil injector bushing 103, or have an included angle less than 90 degrees, and the specific value of the included angle is not limited in the present application.

[0063] The outer circumferential surface of the oil injector bushing 103 has at least two reserved portions 204, and a gap is formed between the reserved portion 204 and the cylinder head body 101. At least one connecting structure 202 is located between two adjacent reserved portions 204.

[0064] As an implementable embodiment, the wall thickness of the oil injector bushing 103 is greater than or equal to 1.2 mm and less than or equal to 1.7 mm. If the wall thickness of the oil injector bushing 103 is less than 1.2 mm, the gap position between the oil injector bushing 103 and the cylinder head body 101 is relatively weak, and the strength at this position is insufficient. If the wall thickness of the oil injector bushing 103 is greater than 1.7 mm, the wall thickness of the cylinder head water cavity is occupied, which causes the sand core structure around the oil injector to be relatively weak. During the operation of the engine, the cylinder head bears the thermal load applied by the high-temperature and high-pressure combustion gas, and the excessive thickness of the wall thickness of the oil injector bushing is not conducive to the heat load dissipation. In some embodiments, the wall thickness of the oil injector bushing 103 can be any one of 1.3 mm, 1.4 mm, 1.5 mm and 1.6 mm, or any value between any two of them, and the specific value of the wall thickness of the oil injector bushing 103 is not limited in the present embodiment.

[0065] As an implementable embodiment, the material of the oil injector bushing 103 includes stainless steel, A3 steel, and cast iron.

[0066] Specifically, the positioning structure 203 and the connecting structure 202 are obtained by machining the A3 steel material initial oil injector bushing 201. The positioning structure 203 includes the positioning protrusion 2013 and the positioning groove 2014, and the connecting structure 202 includes the fitting piece 2011 and the fitting groove 2012. The positioning protrusion 2013 and the positioning groove 2014 jointly limit the movement of the oil injector bushing 103 along the axial direction of the oil injector bushing 103 relative to the cylinder head body 101, the fitting piece 2011 and the fitting groove 2012 are connected to ensure the connection between the oil injector bushing 103 and the cylinder head body 101, and the A3 steel material oil injector bushing 103 can make the cylinder head work normally. In addition, the cost of A3 steel is lower than that of stainless steel, which can significantly reduce the production cost of the cylinder head.

[0067] Referring to FIGS. 1 to 5, Figure 2 , Figure 3 , Figure 5 and Figure 7 , in a second aspect, the embodiments of the present application further provide a manufacturing method of a cylinder head, which comprises:

[0068] S100: providing a casting shell, a combined core and an initial injector bushing, the combined core comprising a base core, a lower jacket core, an upper jacket core, a positioning core and an upper cover core.

[0069] Specifically, the casting shell 301 is a mold in which a part is made in advance in a structural shape of the part so as to obtain the part in the required structural shape.

[0070] S200: installing the combined core and the initial injector bushing in the casting shell and assembling the combined core and the initial injector bushing; the initial injector bushing is located on the base core, the lower jacket core and the upper jacket core are arranged around the outer periphery of the initial injector bushing, the positioning core is embedded in the sleeve cavity of the initial injector bushing, and the upper cover core is arranged on the top of the initial injector bushing.

[0071] S300: pouring liquid casting material into the casting shell and waiting for the liquid casting material to solidify.

[0072] S400: removing the combined core and the casting shell, and forming a cylinder head body from the solidified casting material, and the initial injector bushing is located in the cylinder head body.

[0073] S500: trimming the initial injector bushing to form an injector bushing.

[0074] In the embodiment, the combined core is used to form the injector bushing. Figure 5 As shown in FIG. 3, the positioning core 306 comprises a second positioning structure 401, a sand cleaning structure 402, a third positioning structure 403 and a fourth positioning structure 404; the second positioning structure 401 is used to realize the cooperation of the positioning core 306 and the upper cover core 302, plays a role of positioning and compression, and ensures that the initial injector bushing 201 does not float up during pouring; the sand cleaning structure 402 is used to form a sand cleaning hole structure, can clean the core sand, uniformly thicken the casting wall thickness and reduce internal quality defects of the casting; the third positioning structure 403 is used to realize the positioning cooperation of the positioning core 306 and the side surface of the initial injector bushing 201, fills the inside of the initial injector bushing 201 and prevents molten iron from entering the inside of the initial injector bushing 201 during pouring; and the fourth positioning structure 404 is used to realize the positioning cooperation of the positioning core 306 and the bottom surface of the initial injector bushing 201, plays a role of compression, and ensures that the initial injector bushing 201 does not float up during pouring.

[0075] Specifically, the gap between the initial fuel injector bushing 201 and the bottom plate core 305 is 0.1 mm; the gap between the initial fuel injector bushing 201 and the upper water jacket core 303 and the lower water jacket core 304 is 0.1 mm; the gap between the positioning core 306 and the upper cover core 302 is 0.1 mm; the gap between the positioning core 306 and the bushing side of the initial fuel injector bushing 201 is 0.1 mm. The initial fuel injector bushing 201 plays a role in chilling during the pouring process, accelerates the solidification of molten iron near the cylinder head, and also reduces the sand sticking problem of the water jacket core near it. Reducing the casting scrap rate and the rework rate of internal cavity cleaning can reduce the casting cost and save labor cost.

[0076] S600: mounting a fuel injector in the sleeve cavity of the initial fuel injector bushing, the cylinder head body, the initial fuel injector bushing and the fuel injector together forming a cylinder head.

[0077] The end of the initial fuel injector bushing 201 is provided with an auxiliary positioning protrusion 2015, and the bottom plate core is provided with a bottom plate groove 2016 matched with the auxiliary positioning protrusion 2015 of the initial fuel injector bushing 201.

[0078] The initial fuel injector bushing 201 is trimmed, including: removing the auxiliary positioning protrusion 2015 of the initial fuel injector bushing 201 to form a fuel injector bushing 103.

[0079] The lower water jacket core 304 and the upper water jacket core 303 have cavities therein and correspond to the reserved part 204 of the initial fuel injector bushing 201; the upper cover core 302 is provided with an upper cover groove matched with the positioning protrusion 2013 of the initial fuel injector bushing 201.

[0080] Specifically, the auxiliary positioning protrusion 2015 in the initial fuel injector bushing 201 core assembly process is a redundant structure of the cylinder head blank and needs to be cleaned and polished.

[0081] In a third aspect, the application provides an engine comprising the cylinder head described above. The engine comprises a cylinder, and the cylinder head is arranged at the cylinder port position of the cylinder. Based on the improvement of the cylinder head described above, the sealing performance of the cylinder head can be improved, and the liquid leakage failure rate of the cylinder head is reduced, so that the cylinder head is applied to the engine, which helps to improve the performance of the engine.

[0082] In the above description, it should be understood that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through an intermediate medium, or internal connection of two elements, or interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above-mentioned term in the present application according to the specific circumstances. The orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified and limited.

[0083] The terms "first", "second", "third", "fourth" and the like used in the description and claims of the present application, and the above drawings, if any, are used to distinguish similar objects, and do not necessarily indicate or imply a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0084] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cylinder head, characterized in that, The cylinder head includes a cylinder head body, an injector, and an injector bushing; the cylinder head body has an injection port; the injector bushing is fitted over at least a portion of the outside of the injector, the injector fitted with the injector bushing is installed in the injection port, and the injector bushing is located between the cylinder head body and the injector. A positioning structure and a connecting structure are provided between the injector bushing and the cylinder head body. The positioning structure and the connecting structure are spaced apart along the extending direction of the injector bushing. The injector bushing and the cylinder head body are connected through the positioning structure and the connecting structure. The positioning structure includes a positioning protrusion and a positioning groove. The positioning protrusion is disposed at the first end of the injector bushing, and the extending direction of the positioning protrusion intersects the extending direction of the injector bushing. The positioning groove is disposed on the cylinder head body. The positioning protrusion is embedded in the positioning groove, and the positioning protrusion and the positioning groove together restrict the movement of the injector bushing relative to the cylinder head body along the axial direction of the injector bushing. The cross-sectional area of ​​the positioning protrusion gradually decreases in the direction away from the injector bushing, and the end of the positioning protrusion facing away from the injector bushing is a plane. The outer peripheral surface of the injector bushing has at least two reserved portions, and there is a gap between the reserved portions and the cylinder head body. At least one of the connecting structures is located between two adjacent reserved portions.

2. The cylinder head according to claim 1, characterized in that, There are multiple connection structures, and the multiple connection structures are spaced apart along the extension direction of the injector bushing; At least one of the connection structures is positioned close to the positioning structure.

3. The cylinder head according to claim 1, characterized in that, The connection structure includes a fitting and a fitting groove. The fitting is disposed on one of the cylinder head body and the injector bushing, and the fitting groove is disposed on the other of the cylinder head body and the injector bushing. The fitting element is fitted into and connected to the fitting groove.

4. The cylinder head according to any one of claims 1-3, characterized in that, The wall thickness of the injector bushing is greater than or equal to 1.2 mm and less than or equal to 1.7 mm; and / or the material of the injector bushing includes at least one of stainless steel, A3 steel, and cast iron.

5. A method for manufacturing a cylinder head, characterized in that, The method for manufacturing a cylinder head according to any one of claims 1-4 comprises: Provides a cast shell, a combined core and an initial injector bushing, wherein the combined core includes a chassis core, a lower water jacket core, an upper water jacket core, a positioning core and a top cover core; The combined core and the initial injector bushing are installed inside the cast shell, and the combined core and the initial injector bushing are assembled; the initial injector bushing is located on the chassis core, the lower water jacket core and the upper water jacket core surround the outer periphery of the initial injector bushing, the positioning core is embedded in the sleeve cavity of the initial injector bushing, and the upper cover core is placed on the top of the initial injector bushing; Liquid casting material is poured into the cast shell and allowed to solidify. Remove the combined core and the cast shell, and the solidified casting material forms the cylinder head body, with the initial injector bushing located inside the cylinder head body; The initial injector bushing is trimmed to form an injector bushing; An injector is installed into the cavity of the initial injector bushing, and the cylinder head body, the initial injector bushing, and the injector together form the cylinder head.

6. The method for manufacturing a cylinder head according to claim 5, characterized in that, The initial injector bushing has an auxiliary positioning protrusion at its end, and the chassis core has a chassis groove that mates with the auxiliary positioning protrusion of the initial injector bushing. Trimming the initial injector bushing includes: removing the auxiliary positioning protrusion of the initial injector bushing to form the injector bushing.

7. The method for manufacturing a cylinder head according to claim 5, characterized in that, The lower water jacket core and the upper water jacket core have cavities that correspond to the reserved portion of the initial injector bushing; the upper cover core is provided with an upper cover groove that cooperates with the positioning protrusion of the initial injector bushing.

8. An engine, characterized in that, The cylinder head includes any one of claims 1-4.

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