Metal insert and blank thereof, engine cylinder block and engine

Abstract

The embodiment of the utility model relates to the technical field of engine manufacturing, and provides a metal insert, a metal insert blank, an engine cylinder block and an engine. The metal insert is used for being embedded in the plastic cylinder body of the engine and comprises a first embedding section, a connecting section and a second embedding section which are connected in sequence; and an external thread is arranged on the outer wall of the first embedding section. The metal insert blank comprises a machining section, a first scarf joint section, a connecting section and a second scarf joint section which are connected in sequence. The engine cylinder body comprises a plastic cylinder body and a plurality of metal inserts embedded in the plastic cylinder body. The engine comprises the engine cylinder block. The metal insert provided by the utility model is embedded in the plastic cylinder body of the engine, so that the strength of the part can be enhanced in a limited manner, deformation is avoided, and the service life of the cylinder body of the engine is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of engine manufacturing, in particular to a metal insert and a blank thereof, an engine cylinder block and an engine. Background Art

[0002] At present, in order to achieve lightweight vehicles and reduce the weight of the engine, injection molding engines have been developed. The injection molding engine consists of a plastic cylinder body and a metal cylinder liner. This structure makes the engine cylinder body made of a large amount of plastic material, which greatly reduces the weight.

[0003] However, due to manufacturing process limitations, there is still a problem that the service life of the engine block is limited.

[0004] In view of this, this application is hereby filed. Utility Model Content

[0005] The utility model aims to provide a metal insert and a blank thereof, an engine cylinder block and an engine, aiming to improve the service life of a plastic engine cylinder block.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a metal insert, which is used to be pre-embedded in a plastic cylinder of an engine, and the metal insert comprises a first embedding section, a connecting section, and a second embedding section which are connected in sequence;

[0008] An outer wall of the first engagement section is provided with an external thread.

[0009] In an optional embodiment, a first mounting section is further provided at one end of the first embedding section away from the connecting section, and a first mounting screw hole is provided on an end surface of the first mounting section;

[0010] And / or, a second mounting section is further provided at one end of the second embedding section away from the connecting section, and a second mounting screw hole is provided on an end surface of the second mounting section.

[0011] In an optional embodiment, the first embedding section is thicker than the connecting section, and at least one first lug is provided at the junction of the connecting section and the first embedding section;

[0012] And / or, the second engaging section is thicker than the connecting section, and at least one second lug is provided at the junction of the connecting section and the second engaging section.

[0013] In an optional embodiment, an outer wall of the second engagement section is provided with an external thread.

[0014] In a second aspect, the utility model provides a metal insert blank, which includes a processing section, a first embedding section, a connecting section and a second embedding section connected in sequence.

[0015] In an optional embodiment, the side wall of the processing section is provided with an anti-displacement block, and the anti-displacement block is close to the end of the processing section.

[0016] In an optional embodiment, the first embedding section is thicker than the connecting section, and at least one first lug is provided at the junction of the connecting section and the first embedding section;

[0017] And / or, the second engaging section is thicker than the connecting section, and at least one second lug is provided at the junction of the connecting section and the second engaging section.

[0018] In a third aspect, the utility model provides an engine cylinder block, comprising a plastic cylinder block and a plurality of metal inserts as described in any one of the aforementioned embodiments embedded in the plastic cylinder block;

[0019] The plastic cylinder body has a cylinder installation cavity, and a plurality of metal inserts are arranged around the cylinder installation cavity;

[0020] The cylinder barrel installation cavity is composed of n interconnected and parallel cavities; the engine cylinder block also includes n-1 pairs of main reinforcement members, each pair of main reinforcement members includes two main inserts, and the two main inserts are respectively arranged on the plastic cylinder block at positions corresponding to two opposite connecting points of two adjacent interconnected cavities;

[0021] The number of metal inserts is an even number, and the even number of metal inserts is arranged around the cylinder mounting cavity, wherein half of the metal inserts are located on one side in the long diameter direction of the cylinder mounting cavity, and the other half of the metal inserts are located on the other side in the long diameter direction of the cylinder mounting cavity;

[0022] The main insert includes a first bolt insert, a second bolt insert and a metal part. The metal part is detachably connected between the first bolt insert and the second bolt insert. A first bolt hole is provided in the first bolt insert, and a second bolt hole is provided in the second bolt insert. The outer walls of the first bolt insert and the second bolt insert are provided with external threaded portions and dovetail blocks for connecting with the injection cylinder body during injection molding. There are multiple external threaded portions and dovetail blocks, which are alternately arranged along the axial direction of the first bolt insert.

[0023] In an optional embodiment, there are four metal inserts, two of which are arranged on one side of the cylinder mounting cavity in the long diameter direction, and the other two metal inserts are located on the other side of the cylinder mounting cavity in the long diameter direction.

[0024] In a fourth aspect, the utility model provides an engine, comprising an engine cylinder block as described in the aforementioned embodiment.

[0025] The beneficial effects of the embodiments of the utility model are:

[0026] The metal insert provided by the utility model is pre-embedded in the plastic cylinder of the engine, which can enhance the strength of the part to a limited extent and avoid deformation, thereby increasing the service life of the engine cylinder;

[0027] The engine cylinder provided by the utility model and the arrangement of the main insert in the engine cylinder can improve the overall strength of the cylinder, provide metal connection sites, etc., thereby improving the life of the engine cylinder. However, there is still room for improvement. For example, the main insert continuously pulls and presses the plastic part of the cylinder under the action of the reciprocating inertia force of the crankshaft piston connecting rod, which easily causes deformation of the front and rear ends of the cylinder, thereby causing problems such as wear and tear of the cylinder, thereby shortening the service life of the engine. The metal insert provided by the utility model is arranged at the position of the front and rear ends of the cylinder that is prone to deformation, which can effectively prevent the deformation of the part, reduce the risk of wear and tear of the cylinder, and further extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 Two structural schematic diagrams of the metal insert provided in the first embodiment of the utility model;

[0030] Figure 2 A top view of an engine cylinder block provided in the first embodiment of the utility model;

[0031] Figure 3 for Figure 2 Sectional view of the AA plane;

[0032] Figure 4 An axonometric view of an engine cylinder block provided for the first embodiment of the utility model;

[0033] Figure 5 Two structural schematic diagrams of metal inserts provided in the second embodiment of the utility model;

[0034] Figure 6 Two structural schematic diagrams of the first metal insert blank provided for the third embodiment of the utility model;

[0035] Figure 7 Two structural schematic diagrams of the second metal insert blank provided for the third embodiment of the utility model;

[0036] Figure 8 This is the distribution diagram when the main insert and the metal insert are buried in the plastic cylinder;

[0037] Fig. 9 A schematic diagram of the structure of the main insert in the first viewing angle;

[0038] Fig.10 Schematic diagram of the structure of the main insert from the second perspective.

[0039] Icons: 10-engine cylinder; 11-plastic cylinder; 12-cavity;

[0040] 100 - metal insert; 110 - first embedding section; 111 - first mounting section; 120 - connecting section; 121 - first lug; 122 - second lug; 130 - second embedding section; 131 - second mounting section;

[0041] 200-main insert; 210-first bolt insert; 211-first bolt hole; 212-external threaded portion; 213-dovetail block; 214-positioning groove; 220-second bolt insert; 221-second bolt hole; 230-metal part;

[0042] 300-metal insert blank; 301-processing section; 302-anti-displacement block. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0047] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0048] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] First embodiment

[0050] The embodiment of the utility model provides a metal insert 100, an engine cylinder block 10 and an engine.

[0051] like Figures 2 to 4 As shown, the metal insert 100 provided in this embodiment is used to be embedded in the plastic cylinder block 11 of the engine. Figure 1 As shown, the metal insert 100 is in the shape of an elongated strip, and comprises a first embedding section 110, a connecting section 120 and a second embedding section 130 which are connected in sequence; an outer wall of the first embedding section 110 is provided with an external thread.

[0052] like Figures 2 to 4 As shown, the engine cylinder block 10 provided in this embodiment includes a plastic cylinder block 11 and a plurality of metal inserts 100 embedded in the plastic cylinder block 11; the plastic cylinder block 11 has a cylinder barrel mounting cavity, and the plurality of metal inserts 100 are arranged around the cylinder barrel mounting cavity;

[0053] The cylinder mounting cavity is composed of two interconnected and parallelly arranged cavities 12 (two cavities 12 correspond to the assembly of a two-cylinder engine); the engine cylinder block 10 also includes a pair of main reinforcements, and the pair of main reinforcements includes two main inserts 200. The two main inserts 200 are respectively arranged on the plastic cylinder block 11 at positions corresponding to the two relative connections of the two interconnected cavities 12.

[0054] It should be noted that in other embodiments of the present invention, the cylinder installation cavity may also be composed of n cavities 12, where n>2. Accordingly, the number of pairs of main reinforcement members is n-1 pairs.

[0055] There are four metal inserts 100 arranged around the cylinder mounting cavity, two of which are located on one side of the cylinder mounting cavity in the long diameter direction, and the other two metal inserts 100 are located on the other side of the cylinder mounting cavity in the long diameter direction.

[0056] It should be noted that in other embodiments of the present invention, the number of metal inserts 100 can also be 2, 6, 8 or other even numbers, and they are divided into two parts and distributed on opposite sides of the steel cylinder installation cavity.

[0057] like Figures 8 to 10 As shown, the main insert 200 includes a first bolt insert 210, a second bolt insert 220 and a metal part 230. The metal part 230 is detachably connected between the first bolt insert 210 and the second bolt insert 220. A first bolt hole 211 is provided in the first bolt insert 210, and a second bolt hole 221 is provided in the second bolt insert 220. The outer walls of the first bolt insert 210 and the second bolt insert 220 are both provided with an external threaded portion 212 and a dovetail block 213 for connecting with the injection cylinder body during injection molding. There are multiple external threaded portions 212 and dovetail blocks 213, and they are alternately arranged along the axial direction of the first bolt insert 210.

[0058] The first engaging section 110 of the metal insert 100 and the first bolt insert 210 of the main insert 200 are used to provide a connection site to connect the engine block 10 to its cylinder head (not shown). The second engaging section 130 of the metal insert 100 and the second bolt insert 220 of the main insert 200 are used to provide a connection site to connect to a crankshaft (not shown) outside the engine.

[0059] The main insert 200 in the engine cylinder 10 can improve the overall strength of the cylinder and provide metal connection sites, thereby improving the life of the engine cylinder 10. However, there is still room for improvement. For example, the main insert 200 continuously pulls and presses the plastic part of the cylinder under the action of the reciprocating inertia force of the crankshaft piston connecting rod, which can easily cause the front and rear ends of the cylinder (such as Figure 4As shown by the two arrows in the figure, the two opposite sides of the cylinder installation cavity in the long diameter direction are deformed, which leads to problems such as wear and tear of the cylinder, thereby shortening the service life of the engine. Therefore, this embodiment provides a metal insert 100, which is used to be embedded in the plastic cylinder body 11 and arranged at the front and rear ends that are easy to deform, effectively preventing deformation of this part, reducing the risk of wear and tear of the cylinder, and extending the service life.

[0060] like Figure 1 As shown, further, a first mounting section 111 is provided at one end of the first engaging section 110 away from the connecting section 120, and a first mounting screw hole is provided on an end surface of the first mounting section 111; and / or a second mounting section 131 is provided at one end of the second engaging section 130 away from the connecting section 120, and a second mounting screw hole is provided on an end surface of the second mounting section 131.

[0061] The first mounting screw hole and the second mounting screw hole are used to allow bolts to pass through the cylinder head and be installed therein, so that the cylinder head and the engine block 10 are stably connected.

[0062] Furthermore, the metal insert 100 is made of high-strength aluminum alloy, which is light in weight and is beneficial to the lightweight of the engine block 10 .

[0063] Furthermore, the shape of the metal insert 100 can be a straight strip or a curved strip, which is mainly determined by the specific structure of the plastic cylinder 11. For example, the four metal inserts 100 installed on the engine cylinder 10 provided in this embodiment have two shapes, one is a straight strip ( Figure 1 The structure shown in the right figure), the other is a curved shape ( Figure 1 The first embedding section 110, the connecting section 120, and the second embedding section 130 of the curved metal insert 100 are all straight lines, but the first embedding section 110 and the second embedding section 130 are parallel to each other, but not on the same straight line, and the connecting section 120 is inclined relative to the first embedding section 110 and the second embedding section 130.

[0064] The engine provided in this embodiment includes the above-mentioned plastic cylinder body 11 and the metal cylinder liner, the metal cylinder liner includes a barrel and a cylinder head connected to each other, the shape of the barrel just matches the cylinder installation cavity, and the barrel is inserted into the cylinder installation cavity. The cylinder head is provided with a threaded hole, and the bolt passes through the threaded hole and is screwed into the screw hole provided on the end surface of the main insert 200 and the metal insert 100.

[0065] Second embodiment

[0066] This embodiment is substantially the same as the first embodiment. For matters not described, please refer to the first embodiment.

[0067] like Figure 5As shown, in the metal insert 100 provided in this embodiment, the outer wall of the second embedding section 130 is provided with an external thread to ensure better combination stability between the second embedding section 130 and the plastic cylinder body 11 .

[0068] Specifically, the first splicing section 110 is thicker than the connecting section 120. Through practical application and computer simulation, it is found that the stress is more concentrated in the area close to the splicing section on the connecting section 120. Providing lugs at the stress concentration position can improve the problem of reduced service life of the engine cylinder block 10 caused by stress concentration.

[0069] In particular, for the curved metal insert 100 mentioned in the first embodiment, the part with higher stress is mainly on the inner side of the bend where the connecting section 120 is connected to the first embedding section 110 and the second embedding section 130 respectively. Therefore, for the curved metal insert 100, it is preferred to set a lug on the inner side of the bend, and the number of lugs set may be 1. For the curved metal insert 100, a first lug 121 is set on the inner side of the bend at the junction of the connecting section 120 and the first embedding section 110, and a second lug 122 is set on the inner side of the bend at the junction of the connecting section 120 and the second embedding section 130.

[0070] For the linear metal insert 100 mentioned in the first embodiment, the stress at the junction of the connecting section 120 and the first embedding section 110 is relatively high, but relatively uniform. Therefore, two opposite first lugs 121 are provided here to alleviate the problem of high stress.

[0071] It should be noted that the location and number of the first lugs 121 can be adjusted according to actual needs. Whether the second lugs 122 are provided, and the location and number of the second lugs 122 can also be adjusted according to actual needs.

[0072] In addition, it should be noted that the provision of the lugs can not only relieve stress but also prevent the metal insert from rotating out of position in the cylinder body.

[0073] Third embodiment

[0074] like Figure 6 and Figure 7 As shown, this embodiment provides a metal insert blank 300 , which is in the shape of an elongated strip and includes a processing section 301 , a first embedding section 110 , a connecting section 120 and a second embedding section 130 which are connected in sequence.

[0075] The metal insert blank 300 of this embodiment is used to form the metal insert 100 provided in the first embodiment or the second embodiment. When manufacturing the engine cylinder block 10, the metal insert blank 300 is first placed in a suitable position in the mold, and then plastic (preferably PEEK) is poured into the mold. After the plastic is cooled and formed, the processing section 301 of the metal insert blank 300 needs to be processed, and the part that is higher than the plastic cylinder block 11 is cut off to obtain the first installation section 111, and then screw holes are drilled on the end surface of the first installation section 111.

[0076] When the metal insert blank 300 is used to form the metal insert 100 as shown in the first embodiment after processing, it has no lug arrangement. Figure 6 shown.

[0077] Preferably, the side wall of the processing section 301 is provided with an anti-displacement block 302 that can be clamped with the mold, and the anti-displacement block 302 is close to the end of the processing section 301.

[0078] During the injection molding process, the impact of liquid plastic can easily cause the metal insert blank 300 to be displaced, and the flow rate, temperature, etc. need to be precisely controlled. An anti-displacement block 302 is set on the metal insert blank 300, which is stuck on the mold. When the liquid plastic is poured into the mold, the metal insert 100 will not be displaced, thereby greatly reducing the difficulty of production operation.

[0079] When the metal insert blank 300 is processed to form the metal insert 100 as shown in the second embodiment, the first lug 121 and the second lug 122 are arranged at corresponding positions. Figure 7 shown.

[0080] Finally, it should be noted that in order to ensure the strength of the metal insert, all parts of the metal insert blank are integrally formed.

[0081] The main insert 200 involved in this embodiment is described in detail below:

[0082] like Figures 8 to 10 As shown, the main insert 200 includes a first bolt insert 210, a second bolt insert 220 and a metal member 230. Figure 2 and Figure 3 A first bolt hole 211 is provided in the first bolt insert 210, and a second bolt hole 221 is provided in the second bolt insert 220, wherein the first bolt insert 210 is used to provide a connection site to connect the plastic cylinder body 11 with its cylinder head, and the second bolt insert 220 is used to connect the plastic cylinder body 11 with an external crankshaft. When the cylinder head and the plastic cylinder body 11 are connected by bolts, threaded holes are provided on the cylinder head, and bolts are screwed into the first bolt holes 211 of the first bolt insert 210 through the threaded holes, and the cylinder head and the plastic cylinder body 11 are connected by screwing the bolts into the first bolt insert 210.

[0083] Since it is difficult to screw bolts directly onto plastic, or screwing bolts directly onto plastic may cause cracking and deformation of the plastic, in this embodiment, the first bolt insert 210 and the second bolt insert 220 are pre-embedded on the plastic cylinder body 11 by insert injection molding, and the bolts are screwed onto the first bolt insert 210 and the second bolt insert 220, thereby dispersing stress and avoiding possible cracking and deformation of the plastic.

[0084] The outer walls of the first bolt insert 210 and the second bolt insert 220 are both provided with external threaded portions 212 and dovetail blocks 213 for connecting with the injection cylinder during injection molding. There are multiple external threaded portions 212 and dovetail blocks 213, which are alternately arranged along the axis direction of the first bolt insert 210. In this embodiment, the length of the first bolt insert 210 is greater than the length of the second bolt insert 220, and the number of external threaded portions 212 and dovetail blocks 213 provided on the first bolt insert 210 is greater than the number of external threaded portions 212 and dovetail blocks 213 provided on the second bolt insert 220.

[0085] When the injection molding cylinder body is injection molded, the thread structure of the external threaded portion 212 can be tightly combined with the plastic, and the setting of the dovetail block 213 can further strengthen the bonding strength, thereby preventing the first bolt insert 210 and the second bolt insert 220 from falling off from the plastic cylinder body 11 during operation, thereby helping to extend the service life of the plastic cylinder body 11. The first bolt insert 210 and the second bolt insert 220 are provided with a positioning groove 214 at the inner diameter of the first bolt insert 210 and the second bolt insert 220 for positioning in the injection mold. The positioning groove 214 is an oblong shape.

[0086] The positioning groove 214 in this embodiment is used to install the main insert 200 in the injection mold. A positioning pin is provided in the mold, and the positioning groove 214 can cooperate with the positioning pin to achieve positioning. In this embodiment, the positioning groove 214 is designed to be an oblong shape, and its elasticity can be used to achieve good insertion of the positioning pin into the positioning groove 214. At the same time, after the injection molding is completed, it is also easy to pull it out, which makes the operation more convenient and the positioning more accurate.

[0087] See also Figure 1 , the metal part 230 is detachably connected between the first bolt insert 210 and the second bolt insert 220. Specifically, the two ends of the metal part 230 are respectively threadedly connected to the first bolt insert 210 and the second bolt insert 220. It should be understood that in other embodiments, there are many other ways of detachable connection, such as snap-on connection. In this embodiment, by detachably connecting the metal part 230, the first bolt insert 210 and the second bolt insert 220, it is possible to prepare the metal part 230, the first bolt insert 210 and the second bolt insert 220 separately, which is simpler to prepare and has lower cost.

[0088] Since there is high-temperature combustion gas in the engine cylinder 10, and the bolts are normally used to seal the engine cylinder 10, the force of the high-temperature gas on the bolts will be transmitted to the bolt seat, and the bolt seat will pull the plastic cylinder 11. In this case, the plastic cylinder 11 will be subjected to excessive force and crack and deform. In the present utility model, the first bolt insert 210 and the second bolt insert 220 are connected by a metal part 230, wherein the first bolt insert 210 and the second bolt insert 220 are equivalent to the upper and lower bolt seats. At this time, the force borne by the first bolt insert 210 and the second bolt insert 220 is shared by the high-strength metal part 230, thereby avoiding possible cracking and deformation of the plastic. At the same time, in this embodiment, by setting the metal part 230, the injection molding volume becomes smaller during injection molding, which is conducive to eliminating pores.

[0089] Furthermore, in order to ensure the high strength of the metal part 230, the material of the metal part 230 in this embodiment is aluminum alloy. The aluminum alloy can provide sufficient strength for the plastic cylinder body 11, ensuring that the force of the plastic cylinder body 11 is shared by the first bolt insert 210, the second bolt insert 220 and the metal part 230, thereby reducing the cracking and deformation of the plastic cylinder body 11.

[0090] When the upper part of the plastic cylinder body 11 is connected to the cylinder head and the lower part is connected to the crankshaft, at least two bolts are usually used to ensure the connection effect. For this purpose, the metal member 230 in this embodiment can be one or more. Figure 4 When the metal member 230 is one, it is formed in one piece, and a plurality of first bolt inserts 210 are arranged on the top thereof, and a plurality of second bolt inserts 220 are arranged on the bottom thereof. Figure 1 When there are multiple metal parts 230, the number of the metal parts 230 is the same as the number of the first bolt inserts 210 and the second bolt inserts 220, and each metal part 230 is provided with a first bolt insert 210 on the top and a second bolt insert 220 on the bottom. The arrangement of the metal parts 230 can be selected according to actual conditions.

[0091] The main insert 200 provided by the utility model is provided with an external threaded portion 212 and a dovetail block 213 on the first bolt insert 210 and the second bolt insert 220, so that the first bolt insert 210 and the second bolt insert 220 are not easy to fall off from the plastic cylinder body 11; at the same time, the first bolt insert 210 and the second bolt insert 220 are connected by a high-strength metal part 230. During the injection molding process, when the injection plastic is heated to form a melt and enters the mold of the plastic cylinder body 11 through the valve needle hot runner, the impact force is not easy to cause the first bolt insert 210 and the second The bolt insert 220 is displaced, thereby achieving a limiting effect; and because of the setting of the high-strength metal part 230, the amount of plastic used between the cylinders is reduced, avoiding the problem of pores and interlayers formed due to uneven heat dissipation and insufficient crystallization; when the injection molding engine is running, the metal part 230 connected to the first bolt insert 210 and the second bolt insert 220 can share the force transmitted from the bolts to the first bolt insert 210 and the second bolt insert 220, thereby avoiding possible cracking and deformation of the plastic, which is beneficial to extending the service life of the engine cylinder block.

[0092] In summary, the metal insert provided in the embodiment of the utility model is pre-embedded in the plastic cylinder of the engine, which can enhance the strength of the part to a limited extent and avoid deformation, thereby increasing the service life of the engine cylinder;

[0093] The engine cylinder block provided by the utility model and the setting of the main insert in the engine cylinder block can improve the overall strength of the cylinder block, provide metal connection sites, etc., thereby improving the life of the engine cylinder block. However, there is still room for improvement. For example, the main insert continuously pulls and presses the plastic part of the cylinder block under the action of the reciprocating inertia force of the crankshaft piston connecting rod, which can easily cause deformation of the front and rear ends of the cylinder block, leading to problems such as wear and cylinder pulling, thereby shortening the service life of the engine. Setting the metal insert provided by the utility model at the positions at the front and rear ends of the cylinder block that are prone to deformation can effectively prevent deformation of the parts, reduce the risks of wear and cylinder pulling, and further extend the service life.

[0094] The engine provided by the utility model has a long service life because it includes the engine cylinder body provided by the utility model.

[0095] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A metal insert, characterized in that: It is used for pre-embedding in a plastic cylinder of an engine, and the metal insert comprises a first embedding section, a connecting section, and a second embedding section which are connected in sequence; The outer wall of the first engaging section is provided with an external thread; The first embedding section is thicker than the connecting section, and at least one first lug is provided at the junction of the connecting section and the first embedding section.

2. The metal insert according to claim 1, characterized in that: A first mounting section is further provided at one end of the first embedding section away from the connecting section, and a first mounting screw hole is provided on the end surface of the first mounting section; And / or, a second mounting section is further provided at one end of the second embedding section away from the connecting section, and a second mounting screw hole is provided on an end surface of the second mounting section.

3. The metal insert according to claim 1 or 2, characterized in that: The second embedding section is thicker than the connecting section, and at least one second lug is arranged at the junction of the connecting section and the second embedding section.

4. The metal insert according to claim 1 or 2, characterized in that: An outer wall of the second engagement section is provided with an external thread.

5. A metal insert blank, characterized in that: It comprises a processing section, a first engaging section, a connecting section and a second engaging section which are connected in sequence; The first embedding section is thicker than the connecting section, and at least one first lug is provided at the junction of the connecting section and the first embedding section.

6. The metal insert blank according to claim 5, characterized in that: The side wall of the processing section is provided with an anti-displacement block, and the anti-displacement block is close to the end of the processing section.

7. The metal insert blank according to claim 5 or 6, characterized in that: The second embedding section is thicker than the connecting section, and at least one second lug is provided at the junction of the connecting section and the second embedding section.

8. An engine cylinder block, characterized in that: It comprises a plastic cylinder body and a plurality of metal inserts as claimed in any one of claims 1 to 4 embedded in the plastic cylinder body; The plastic cylinder body has a cylinder installation cavity, and a plurality of metal inserts are arranged around the cylinder installation cavity; The cylinder barrel installation cavity is composed of n interconnected and parallel cavities; the engine cylinder block also includes n-1 pairs of main reinforcements, each pair of the main reinforcements includes two main inserts, and the two main inserts are respectively arranged on the plastic cylinder block at positions corresponding to two opposite connecting points of two adjacent interconnected cavities; The number of the metal inserts is an even number, and the even number of the metal inserts is arranged around the cylinder mounting cavity, wherein half of the metal inserts are located on one side in the long diameter direction of the cylinder mounting cavity, and the other half of the metal inserts are located on the other side in the long diameter direction of the cylinder mounting cavity; The main insert includes a first bolt insert, a second bolt insert and a metal part, the metal part is detachably connected between the first bolt insert and the second bolt insert, a first bolt hole is arranged in the first bolt insert, a second bolt hole is arranged in the second bolt insert, and the outer walls of the first bolt insert and the second bolt insert are both provided with an external threaded portion and a dovetail block for connecting with the injection cylinder body during injection molding, and the external threaded portion and the dovetail block are both multiple and alternately arranged along the axial direction of the first bolt insert.

9. The engine block according to claim 8, characterized in that: The number of the metal inserts is 4, of which 2 are arranged on one side of the metal insert in the long diameter direction of the cylinder mounting cavity, and the other 2 metal inserts are located on the other side of the long diameter direction of the cylinder mounting cavity.

10. An engine, characterized in that: Comprising the engine block as claimed in claim 9.

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