Dissimilar metal connecting assembly and hard metal connecting piece thereof

Abstract

The utility model provides a dissimilar metal connecting assembly and a hard metal connecting piece thereof, and the hard metal connecting piece comprises a first connecting body which is provided with a first connecting end and a second connecting end; the tenon is arranged on the first connecting end and used for being connected with a soft alloy connecting piece; the mounting structure is arranged on the second connecting end and is used for being connected with a target part; wherein the tenon is provided with a limiting structure, so that the hard metal connecting piece and the soft alloy connecting piece can be fixedly connected through the limiting structure; the hard metal connecting piece and the soft alloy connecting piece are effectively connected, and a mounting structure capable of being connected with a target part is arranged on the hard metal connecting piece, so that the reliability risk of a connecting structure between dissimilar metal pieces is solved, and the risk of connection failure caused by the characteristics of a soft metal material is avoided; and the processing difficulty of the soft alloy connecting piece is also simplified. Due to the fact that the hard metal connecting pieces bear main connecting loads, the stability and the safety of the whole connecting system are greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of dissimilar metal connection structures, and in particular to a dissimilar metal connection assembly and a hard metal connection piece thereof. Background Art

[0002] With the rapid development of the automotive industry and technological progress, the requirements for the functionality and durability of automotive parts are increasing. Especially in core components such as the internal structure of the car and the engine, it is often necessary to effectively connect soft metal parts (such as aluminum, copper and their alloys) with hard metal parts (such as steel, iron and their alloys). This is because soft metals usually have the characteristics of light weight, excellent thermal conductivity and electrical conductivity, while hard metals can provide higher mechanical strength and wear resistance. Therefore, how to design a new connection technology that can fully utilize the advantages of the two metal materials and ensure the strength and reliability of the connection has gradually become one of the key technologies in the current automotive manufacturing industry.

[0003] At present, the commonly used connection structures in the market mainly include threaded connection, riveting, etc. For example, the corresponding connection structures are pre-set on the soft and hard metal parts, such as processing threaded holes on the soft metal parts, preparing bolts on the hard metal parts, and fastening the two through threaded matching; another common practice is to pre-fabricate rivets and rivet holes on the soft and hard metal parts respectively, and use the riveting process to forcibly fix the two together.

[0004] However, these existing connection methods often rely on a single contact surface or point force, and cannot fully adapt to and compensate for the differences in physical properties between the two materials. Due to the material properties of soft metals themselves, their rigidity and fatigue resistance are inferior to those of hard metals. Under long-term load, vibration and impact environments, the connection structure on the soft metal is prone to deformation, wear and even fracture of the soft metal parts due to stress concentration, which seriously affects the stability and service life of the connection. In view of this, the existing connection technology is difficult to fully meet the stringent requirements of automotive parts for reliable connection between soft and hard metals under complex working conditions. There is an urgent need to further improve the connection performance and safety of automotive parts. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a connection assembly of dissimilar metals and a hard metal connector thereof, so as to effectively connect the hard metal connector with the soft alloy connector, and to set the mounting structure that can be connected to the target component on the hard metal connector, thereby solving the reliability risk of the connection structure between dissimilar metal parts.

[0006] In order to solve the above technical problems, the following technical solutions are provided in the embodiments of the present application:

[0007] In a first aspect, the present application provides a hard metal connector, which mainly includes: a first connecting body, which has a first connecting end and a second connecting end; a tenon, which is arranged on the first connecting end and is used to connect with the soft alloy connector; a mounting structure, which is arranged on the second connecting end and is used to connect with a target component;

[0008] The tenon is provided with a limiting structure, so that the hard metal connecting part and the soft alloy connecting part can be fixedly connected through the limiting structure.

[0009] In some modified implementations of the first aspect of the present application, the material rigidity strength of the first connecting body can be higher than the material rigidity strength of the soft alloy connecting piece.

[0010] In some modified implementations of the first aspect of the present application, the mounting structure is configured as a threaded structure opened on the second connection end; or the mounting structure is configured as a rivet configured on the second connection end and a rivet hole opened on the first connection body.

[0011] In some modified implementations of the first aspect of the present application, the size of the first connecting end is larger than the size of the tenon, so as to form a convex ridge on the first connecting end, and the convex ridge is used to abut against the end of the soft alloy connecting piece.

[0012] In some modified implementations of the first aspect of the present application, the tenon includes a joint portion and a connecting rod portion; the size of the joint portion is larger than that of the connecting rod portion, and the joint portion is located on a side of the connecting rod portion away from the first connecting body.

[0013] In some modified implementations of the first aspect of the present application, the cross-sections of the joint portion and the connecting rod portion are both set to be circular, and the cross-sectional diameter of the joint portion is larger than the cross-sectional diameter of the connecting rod portion.

[0014] In some modified implementations of the first aspect of the present application, the cross section of the joint portion is set to be circular;

[0015] The cross section of the connecting rod portion is set to be polygonal, and the connecting rod portion has at least three concave surfaces, and each concave surface is arranged circumferentially around the outer peripheral side surface of the connecting rod portion;

[0016] The cross-sectional area of ​​the joint portion is greater than the cross-sectional area of ​​the connecting rod portion.

[0017] In some modified implementations of the first aspect of the present application, the tenon further includes a base portion;

[0018] The size of the base portion is larger than that of the connecting rod portion, and the base portion is located at a side of the connecting rod portion away from the joint portion.

[0019] The second aspect of the present application provides a connection assembly of dissimilar metals, which mainly comprises: a soft alloy connection piece and the hard metal connection piece proposed in the first aspect of the present application;

[0020] The soft alloy connector includes: a second connecting body, which has a third connecting end, and a mortise with an accommodating space is provided on the first connecting end for being mounted on the tenon; the mortise includes a first accommodating area and a second accommodating area; the size of the first accommodating area is larger than the size of the second accommodating area, and the first accommodating area is located on the side of the second accommodating area away from the mortise notch; when the mortise is mounted on the tenon, the joint portion on the tenon is located in the first accommodating area, and the connecting rod portion on the tenon is located in the second accommodating area.

[0021] In some modified implementations of the second aspect of the present application, the mortise also includes a third accommodating area; the size of the third accommodating area is larger than that of the second accommodating area, and the third accommodating area is located on the side of the second accommodating area away from the first accommodating area, and when the mortise is sleeved on the tenon, the base portion on the tenon is located in the third accommodating area, and the outer end of the notch of the mortise abuts against the convex ridge of the first connecting body.

[0022] Compared with the prior art, the dissimilar metal connection assembly and its hard metal connector provided by the present application adopt a connection method combining the tenon on the hard metal connector and the soft alloy connector. The core of this design is to transfer the connection load originally set on the soft alloy connector to the hard metal connector with higher hardness and strength, avoiding the risk of connection failure due to the characteristics of soft metal materials, simplifying the processing difficulty of soft alloy connectors, and reducing production costs. Since the hard metal connector bears the main connection load, the stability and safety of the entire connection system are greatly improved, which is particularly suitable for the connection strength and durability of parts in the automotive industry, ensuring the efficient connection of automotive parts while greatly improving the reliability and service life of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0024] Figure 1 The structural diagram of the hard metal connector in the embodiment of the present application is schematically shown;

[0025] Figure 2 The structural diagram of the tenon in the embodiment of the present application is schematically shown;

[0026] Figure 3 The structural diagram of the soft alloy connector in the embodiment of the present application is schematically shown;

[0027] Figure 4 Schematically shows Figure 3AA section view;

[0028] Figure 5 The schematic diagram of the structure of the connection assembly of dissimilar metals in the embodiment of the present application is shown schematically;

[0029] Figure 6 Schematically shows Figure 5 BB cross-sectional view.

[0030] Description of Figure Numbers:

[0031] 1. A first connecting body;

[0032] 1a, first connection end; 1b, second connection end; 11, tenon; 12, mounting structure; 13, convex rib; 111, joint portion; 112, connecting rod portion; 113, base portion;

[0033] 2. A second connection body;

[0034] 2a, third connection end; 20, mortise; 201, first accommodating area; 202, second accommodating area; 203, third accommodating area. DETAILED DESCRIPTION

[0035] The exemplary embodiments disclosed in the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments disclosed in the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0036] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0037] Reference Figure 1 and Figure 2 As shown, the embodiment of the present application provides a hard metal connector, which may include: a first connecting body 1, which has a first connecting end 1a and a second connecting end 1b; a tenon 11, which is arranged on the first connecting end 1a and is used to connect with the soft alloy connector; a mounting structure 12, which is arranged on the second connecting end 1b and is used to connect with the target component;

[0038] The tenon 11 has a limiting structure, so that the hard metal connector and the soft alloy connector can be fixedly connected through the limiting structure.

[0039] Specifically, in the technical solution adopted in the present application, the entire hard metal connector can be made of a hard metal material. In the present embodiment, the hard metal material can be metal steel, and the first connecting body 1 has two connecting ends, namely a first connecting end 1a and a second connecting end 1b. A tenon 11 for connecting a soft alloy connector is formed on the first connecting end 1a, and a mounting structure 12 for connecting a target component is provided on the second connecting end 1b; thereby, the hard metal connector proposed in the present application assists the soft alloy connector in connecting with the target component, so as to improve the connection strength between the soft alloy connector and the target component, and it is not easy to cause the connection structure to be damaged due to insufficient material strength of the soft alloy connector, thereby posing a reliability risk.

[0040] Furthermore, in some embodiments, the material rigidity strength of the first connection body 1 can be higher than the material rigidity strength of the soft alloy connection piece.

[0041] Specifically, in the technical solution adopted in the present application, the soft alloy connector connected to the tenon 11 is generally made of aluminum alloy material. The rigidity strength of the aluminum alloy material is weaker than that of the metal steel material. Therefore, after the soft alloy connector is connected to the target component with the assistance of the hard metal connector in the present application, a mounting structure 12 for connecting to the target part can be provided on the second connection end 1b, so as to strengthen the connection relationship with the target component through the rigidity strength characteristics of the metal steel material, thereby effectively improving the stability of the connection structure between the soft alloy connector and the target component.

[0042] Further, see Figure 1 and Figure 2 As shown, in some embodiments, the mounting structure 12 is configured as a threaded structure opened on the second connection end 1b; or the mounting structure 12 is configured as a rivet configured on the second connection end 1b and a rivet hole opened on the first connection body 1.

[0043] Specifically, in the technical solution adopted in the present application, a first embodiment of the mounting structure 12 is proposed. The mounting structure 12 can adopt an internal thread structure and an external thread structure arranged on the second connecting end 1b. The internal thread structure is specifically a threaded hole for connecting the target component is opened on the second connecting end 1b, and the threaded hole has an internal thread structure; and an external thread structure can also be arranged on the outer periphery of the second connecting end 1b, and a threaded hole capable of accommodating the second connecting end 1b is opened on the target component, so that the second connecting end 1b can be fastened and installed on the target component through the threaded structure.

[0044] In one embodiment, the present application also proposes a second implementation of the mounting structure 12, the mounting structure 12 can be composed of rivets and rivet holes, the rivet holes can be opened on the second connection end 1b, and the second connection end 1b can be fixedly mounted on the target component by the cooperation of the rivets; the two implementations of the above-mentioned mounting structure 12 can both realize the connection of the second connection end 1b with the target component, and both mounting structures 12 have a strengthening gain in the connection structure due to the metal steel material used in the hard metal connector compared to the aluminum alloy material. The stability of the connection structure between the soft alloy connector and the target component is effectively improved. It should be noted that the mounting structure 12 can also adopt other structures, which can realize the connection with the target component on the second connection end 1b, all of which are within the protection scope of the present application.

[0045] Further, see Figure 1 and Figure 2 As shown, in some embodiments, the size of the first connecting end 1a is larger than the size of the tenon 11, so as to form a convex ridge 13 on the first connecting end 1a, and the convex ridge 13 is used to abut against the end of the soft alloy connecting piece.

[0046] Specifically, in the technical solution adopted by the present application, the tenon 11 is used to be inserted into the mortise 20 of the soft alloy connector. In this embodiment, the tenon 11 is formed on the first connection end 1a, and the size of the first connection end 1a is larger than the maximum size of the tenon 11, so that a convex rib 13 is formed on the first connection end 1a. When the tenon 11 is inserted into the soft alloy connector, the convex rib 13 can abut against the end of the soft alloy connector to limit the maximum insertion distance of the tenon 11 into the soft alloy connector, so as to ensure that the tenon 11 can accurately enter the set position in the soft alloy connector.

[0047] Further, see Figure 2 As shown, in some embodiments, the tenon 11 includes a joint portion 111 and a connecting rod portion 112 ; the size of the joint portion 111 is larger than that of the connecting rod portion 112 , and the joint portion 111 is located on a side of the connecting rod portion 112 away from the first connecting body 1 .

[0048] Specifically, in the technical solution adopted by the present application, in one embodiment, the tenon 11 includes a joint portion 111 and a connecting rod portion 112, and in the design of the tenon 11, the size of the joint portion 111 is larger than the size of the connecting rod portion 112. Therefore, when the tenon 11 is inserted into the soft alloy connector, the joint portion 111 and the connecting rod portion 112 can cooperate with each other to form a limiting structure, so that the tenon 11 can be fixedly installed in the mortise 20 of the soft alloy connector. Specifically, the size of the joint portion 111 is larger than the size of the portion of the mortise 20 corresponding to the connecting rod portion 112, and after the restriction is formed between the joint portion 111 and the mortise 20, the tenon 11 can be fixed in the mortise 20. In the process of installing the tenon 11 in the mortise 20, a slot that can support the insertion of the tenon 11 can be opened at the end of the soft alloy connector, the tenon 11 is inserted into the slot, and the end of the soft alloy connector is pressed against the ridge 13 of the first connecting body 1, and then the equipment is used to apply pressure on the outer wall of the soft alloy connector to deform it. Specifically, the pressure can be applied to the outer wall of the corresponding connecting rod part 112 so that part of the inner wall of the slot fits on the connecting rod part 112, thereby forming the mortise 20 required by the present application. Under this operation, the hard metal connector and the soft alloy connector can be fixedly connected through the cooperation of the tenon 11 and the mortise 20.

[0049] In the present application, since the soft alloy connector is generally made of aluminum alloy material, and since the plasticity of aluminum alloy material is higher than that of hard metal steel material, in one embodiment of the present application, the tenon 11 is formed on the hard metal connector, and the mortise 20 is formed on the soft alloy connector.

[0050] Furthermore, in some embodiments, the cross-sections of the joint portion 111 and the connecting rod portion 112 are both set to be circular, and the cross-sectional diameter of the joint portion 111 is greater than the cross-sectional diameter of the connecting rod portion 112 .

[0051] Specifically, in the technical solution adopted by the present application, in one embodiment, the cross-sections of the joint portion 111 and the connecting rod portion 112 are both set to be circular, that is, the partial structure of the joint portion 111 and the partial structure of the connecting rod portion 112 are both cylindrical structures, wherein the difference between the two cylindrical structures is that the diameter of the joint portion 111 is larger than the diameter of the connecting rod portion 112, so that after the tenon 11 is inserted into the slot of the soft alloy connector, the position of the slot corresponding to the connecting rod portion 112 has a space that can be pressurized, and the use of equipment to apply pressure to the entire circle of radial side surfaces of the position can drive the structure of the slot to deform, thereby forming the required mortise 20.

[0052] Further, see Figure 2 As shown, in some embodiments, the cross section of the joint portion 111 is set to be circular;

[0053] The cross section of the connecting rod portion 112 is set to be polygonal, and the connecting rod portion 112 has at least three concave surfaces, and each concave surface is arranged circumferentially around the outer peripheral side surface of the connecting rod portion 112;

[0054] The cross-sectional area of ​​the joint portion 111 is greater than the cross-sectional area of ​​the connecting rod portion 112 .

[0055] Specifically, in the technical solution adopted by the present application, as the preferred embodiment of the tenon 11 in the present application, the joint part 111 is the same as the above embodiment, and part of the structure of the joint part 111 is also set as a cylindrical structure. The difference compared with the above embodiment is that the cross section of the connecting rod part 112 is set as a polygon, so that the outer side of the connecting rod part 112 has multiple concave surfaces. After adopting this structure, after applying pressure on the soft alloy connector through the equipment, the contact area between the outer side of the connecting rod part 112 and the groove wall can be increased, so that it is easier to detect whether the pressing degree of the soft alloy connector meets the standard.

[0056] In one embodiment, the cross-section of the connecting rod portion 112 can be triangular, that is, the connecting rod portion 112 has three concave surfaces; the cross-section of the connecting rod portion 112 can also be quadrilateral, and its concave surfaces are increased from three to four, and so on. It can be a pentagon or a hexagon, etc. When the equipment processes the soft alloy connector, the corresponding concave surfaces can be pressed together.

[0057] Further, see Figure 2 As shown, in some embodiments, the tenon 11 further includes a base portion 113 ; the size of the base portion 113 is larger than the size of the connecting rod portion 112 , and the base portion 113 is located on a side of the connecting rod portion 112 away from the joint portion 111 .

[0058] Specifically, in the technical solution adopted by the present application, the tenon 11 may also include a base portion 113 located between the connecting rod portion 112 and the first connecting end 1a, the size of the base portion 113 is larger than the size of the connecting rod portion 112, and the structure of the joint portion 111 and the base portion 113 is adapted to the slot structure provided on the soft alloy connector, for example: if the slot is a circular structure, the joint portion 111 and the base portion 113 are set as a cylindrical structure, and if the slot is a square structure, the joint portion 111 and the base portion 113 are set as a rectangular parallelepiped structure. After adding the base portion 113 to the tenon 11, the structural strength between the tenon 11 and the first connecting body 1 can be increased, and when the soft alloy connector is pressed, two bending structures can be formed at the position of the mortise 20 near the bottom and the notch, which can make the connection structure between the tenon 11 and the mortise 20 more stable, further reducing the probability of reliability risk.

[0059] Reference Figures 3 to 6As shown, the embodiment of the present application also provides a dissimilar metal connection assembly, which mainly includes: a soft alloy connection piece and a hard metal connection piece provided in the first aspect of the present application;

[0060] The soft alloy connector includes: a second connecting body 2, which has a third connecting end 2a, and a mortise 20 with a accommodating space is opened on the first connecting end 1a, which is used to be mounted on the tenon 11; the mortise 20 includes a first accommodating area 201 and a second accommodating area 202; the size of the first accommodating area 201 is larger than the size of the second accommodating area 202, and the first accommodating area 201 is located on the side of the second accommodating area 202 away from the notch of the mortise 20; when the mortise 20 is mounted on the tenon 11, the joint portion 111 on the tenon 11 is located in the first accommodating area 201, and the connecting rod portion 112 on the tenon 11 is located in the second accommodating area 202.

[0061] Specifically, in the technical solution adopted in the present application, the connection assembly of dissimilar metals is composed of a combination of soft alloy connectors and hard metal connectors. Regarding the hard metal connectors, please refer to the contents recorded in the first aspect of the present application, so no detailed description will be given.

[0062] The soft alloy connector includes a second connecting body 2, and the second connecting body 2 includes a third connecting end 2a having a mortise 20, and the mortise 20 is used to be sleeved on the tenon 11. Before the mortise 20 is formed on the third connecting end 2a, a slot is provided on the third connecting end 2a for the tenon 11 to be freely inserted and removed, and the accommodation space in the slot includes a first accommodation area 201 and a second accommodation area 202, the first accommodation area 201 is used to be sleeved on the joint part 111 of the tenon 11, and the second accommodation area 202 is used to be sleeved on the connecting rod part 112 of the tenon 11. When the equipment is used to press the part of the soft alloy connector located in the second accommodating area 202, the groove wall located in the second accommodating area 202 can be driven to fit onto the outer wall of the connecting rod part 112, so that the second accommodating area 202 is smaller than the first accommodating area 201. It can also be understood that after the soft alloy connector is pressed, the joint part 111 cannot be pulled out of the mortise 20 through the second accommodating area 202, so as to form a connecting structure between the soft alloy connector and the hard metal connector.

[0063] Further, see Figure 4 As shown, in some embodiments, the mortise 20 also includes a third accommodating area 203; the size of the third accommodating area 203 is larger than the size of the second accommodating area 202, and the third accommodating area 203 is located on the side of the second accommodating area 202 away from the first accommodating area 201. When the mortise 20 is sleeved on the tenon 11, the base portion 113 on the tenon 11 is located in the third accommodating area 203, and the outer end of the notch of the mortise 20 abuts against the convex ridge 13 of the first connecting body 1.

[0064] Specifically, in the technical solution adopted by the present application, due to the modified implementation of the first aspect of the present application, a base portion 113 is further provided on the tenon 11, thereby forming a third accommodating area 203 for sleeve mounting the base portion 113 in the mortise 20. The third accommodating area 203 is formed by pressing the side wall of the soft alloy connector corresponding to the second accommodating area 202, specifically, the first accommodating area 201 and the third accommodating area 203 are supported by the joint portion 111 and the base portion 113 respectively, and due to the size factor of the connecting rod portion 112, a space that can be pressed is formed between the groove wall of the second accommodating area 202 and the connecting rod portion 112, so that after being pressed by the equipment, a mortise 20 that can fit the structure of the tenon 11 is formed at the third connecting end 2a of the soft alloy connector.

[0065] It should be noted that in the description of this specification, the terms "upper", "lower", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application 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 this application; the terms "connect", "install", "fixed", etc. should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A hard metal connector, characterized in that: include: A first connecting body (1) having a first connecting end (1a) and a second connecting end (1b); a tenon (11), which is arranged on the first connecting end (1a) and is used for connecting with a soft alloy connecting piece; A mounting structure (12), which is arranged on the second connecting end (1b) and is used for connecting with a target component; The tenon (11) is provided with a limiting structure, so that the hard metal connecting piece and the soft alloy connecting piece can be fixedly connected through the limiting structure.

2. The hard metal connector according to claim 1, characterized in that The material rigidity strength of the first connection body (1) can be higher than the material rigidity strength of the soft alloy connection piece.

3. The hard metal connector according to claim 2, characterized in that The mounting structure (12) is configured as a threaded structure provided on the second connection end (1b); or The mounting structure (12) is configured as a rivet arranged on the second connecting end (1b) and a rivet hole opened on the first connecting body (1).

4. The hard metal connector according to any one of claims 1 to 3, characterized in that The size of the first connecting end (1a) is larger than the size of the tenon (11), so that a convex ridge (13) is formed on the first connecting end (1a), and the convex ridge (13) is used to abut against the end of the soft alloy connecting piece.

5. The hard metal connector according to claim 4, characterized in that The tenon (11) comprises a joint portion (111) and a connecting rod portion (112); The size of the joint portion (111) is larger than the size of the connecting rod portion (112), and the joint portion (111) is located on a side of the connecting rod portion (112) away from the first connecting body (1).

6. The hard metal connector according to claim 5, characterized in that The cross-sections of the joint portion (111) and the connecting rod portion (112) are both arranged to be circular, and the cross-sectional diameter of the joint portion (111) is greater than the cross-sectional diameter of the connecting rod portion (112).

7. The hard metal connector according to claim 5, characterized in that The cross section of the joint portion (111) is arranged to be circular; The cross section of the connecting rod portion (112) is set to be polygonal, and the connecting rod portion (112) has at least three concave surfaces, and each of the concave surfaces is arranged circumferentially around the outer peripheral side surface of the connecting rod portion (112); Wherein, the cross-sectional area of ​​the joint portion (111) is greater than the cross-sectional area of ​​the connecting rod portion (112).

8. The hard metal connector according to claim 5, characterized in that The tenon (11) further comprises a base portion (113); The size of the base portion (113) is larger than the size of the connecting rod portion (112), and the base portion (113) is located on a side of the connecting rod portion (112) away from the joint portion (111).

9. A connection assembly of dissimilar metals, characterized in that: include: A soft alloy connector and a hard metal connector as claimed in any one of claims 1 to 8; The soft alloy connecting piece comprises: A second connecting body (2) having a third connecting end (2a), wherein the first connecting end (1a) is provided with a mortise (20) having an accommodation space and is used for being sleeved on the tenon (11); The mortise groove (20) comprises a first accommodating area (201) and a second accommodating area (202); The size of the first accommodating area (201) is larger than the size of the second accommodating area (202), and the first accommodating area (201) is located on a side of the second accommodating area (202) away from a notch of the mortise (20); when the mortise (20) is sleeved on the tenon (11), the joint portion (111) on the tenon (11) is located in the first accommodating area (201), and the connecting rod portion (112) on the tenon (11) is located in the second accommodating area (202).

10. The dissimilar metal connection assembly according to claim 9, characterized in that: The mortise groove (20) also includes a third accommodating area (203); The size of the third accommodating area (203) is larger than the size of the second accommodating area (202), and the third accommodating area (203) is located on the side of the second accommodating area (202) away from the first accommodating area (201); when the mortise (20) is sleeved on the tenon (11), the base portion (113) on the tenon (11) is located in the third accommodating area (203), and the outer end of the notch of the mortise (20) abuts against the convex ridge (13) of the first connecting body (1).

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