Middle motor mounting structure and moped

Abstract

The utility model discloses a centrally-mounted motor mounting structure and a moped, and belongs to the technical field of centrally-mounted motor mounting. The centrally-mounted motor mounting structure comprises a frame, a centrally-mounted motor and a gap adjusting part, the frame is provided with a first end face and a second end face. When the first mounting top surface of the outer shell of the middle motor abuts against the first end surface, a gap is formed between the second mounting top surface of the outer shell and the second end surface; the gap adjusting part comprises an adjusting body and a first elastic part, one end of the adjusting body is in interference fit with the interior of the mounting hole of the second mounting top face, the first elastic part is mounted at the other end of the adjusting body, and the adjusting body can drive the first elastic part to move in the direction close to the second end face so as to compensate the gap between the second mounting top face and the second end face. The elastic piece abuts against the second end face, and vibration friction between the frame and the outer shell is avoided under the condition that the production difficulty of the frame is not increased. The first elastic piece has electrical insulating property, and the first end face and / or the first mounting top face are / is provided with the first insulating layer, so that electric corrosion is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mid-mounted motor installation, in particular to a mid-mounted motor installation structure and a power-assisted vehicle. Background Art

[0002] In order to facilitate the installation of the mid-mounted motor and the frame, it is generally designed to be assembled with a gap between a large frame and a small mid-mounted motor. That is, the frame installation span is larger than the motor installation width, so that after direct assembly, the frame must overcome deformation to compensate for this installation gap to make the entire structure stable. However, this installation structure will greatly reduce the life of the frame, and the two metals with different electrode potentials in direct contact will accelerate oxidation and corrosion, thereby further reducing the service life of the frame and the mid-mounted motor.

[0003] In order to solve the above problems, the prior art introduces a gap adjustment member to compensate for the above installation gap. However, in actual use, direct contact between metals will cause severe friction under conditions such as vibration and impact, thereby increasing the noise of the entire mechanism and being prone to electrical corrosion.

[0004] In view of the above problems, it is urgent to develop a mid-mounted motor installation structure and a power-assisted vehicle that can simultaneously compensate for the installation gap, eliminate electrical corrosion, and reduce the noise generated by metal friction to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a mid-mounted motor installation structure and a power-assisted bicycle, which can compensate for the installation gap between the mid-mounted motor and the frame without increasing the difficulty of the frame production process, and can also eliminate electrical corrosion and reduce the noise generated by metal friction.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A mid-mounted motor installation structure, comprising:

[0008] A frame, wherein a receiving space is formed in the frame, and the frame has a first end surface and a second end surface which are located in the receiving space and are arranged opposite to each other;

[0009] A mid-mounted motor comprises an outer shell, the outer shell is installed in the accommodation space, and in a free state, when the first installation top surface of the outer shell abuts against the first end surface, there is a gap between the second installation top surface of the outer shell and the second end surface; the second installation top surface is provided with a mounting hole;

[0010] A gap adjustment member, comprising an adjustment body and a first elastic member, wherein one end of the adjustment body is interference-connected to the mounting hole, and the first elastic member is mounted to the other end of the adjustment body, and the adjustment body can drive the first elastic member to move in the mounting hole toward the second end surface, thereby filling the gap between the second mounting top surface and the second end surface, so that the first elastic member abuts against the second end surface;

[0011] The first elastic member has electrical insulation, and a first insulating layer is arranged on the first end surface and / or the first mounting top surface.

[0012] As an optional solution, the outer shell and the gap adjustment member are respectively located inside the accommodating space, and a first mounting through hole and a second mounting through hole are respectively provided at opposite ends of the frame, the first mounting through hole and the first end surface are located on one side, the second mounting through hole and the second end surface are located on the other side, the first mounting through hole and the second mounting through hole are respectively connected to the accommodating space, and the first mounting through hole and the second mounting through hole are coaxial.

[0013] As an optional solution, the central motor installation structure further includes:

[0014] a first screw, the first screw being used to pass through the first mounting through hole and being connected to the outer shell through threads, so as to fix the outer shell to the first end surface;

[0015] A second screw is used to pass through the second mounting through hole and the first elastic member in sequence and be connected to the adjustment body through threads, and the adjustment body can move toward the second end face under the action of the thread clamping force of the second screw so that the first elastic member is pressed against the second end face.

[0016] As an optional solution, the regulating body includes:

[0017] A connecting body, which is arranged close to the outer shell, the connecting body has a first outer circumferential surface and a first inner surface, the first inner surface is provided with an internal thread, and the internal thread matches the second screw;

[0018] A carrier, wherein a first avoidance through hole for the second screw to pass through is arranged in the carrier, the carrier comprises a connecting portion and a crimping portion connected to each other, the connecting portion is connected to a side of the connecting body away from the outer shell, the first elastic member is connected to a side of the crimping portion that is not connected to the connecting portion, and the connecting body and the connecting portion are both interference connected to the mounting hole; the connecting portion has a second outer circumferential surface, and the crimping portion has a third outer circumferential surface, the second outer circumferential surface is higher than the first outer circumferential surface, so that a first step is formed at the connection between the connecting body and the connecting portion, and the third outer circumferential surface is higher than the second outer circumferential surface, so that a second step is formed at the connection between the connecting portion and the crimping portion.

[0019] As an optional solution, the connector and the carrier are an integrated structure or a split structure.

[0020] As an optional solution, an internal threaded hole is also provided in the outer shell, the mounting hole is separated from the internal threaded hole and is coaxial with the internal threaded hole, the first screw passes through the first mounting through hole and is threadedly connected to the internal threaded hole to install the outer shell into the accommodating space and make the first mounting top surface abut against the first end surface.

[0021] As an optional solution, the mounting hole includes a first inner hole and a second inner hole coaxially arranged, the second inner hole is arranged close to the internal threaded hole, the first inner hole has a second inner surface, the second inner hole has a third inner surface, the first outer circumferential surface is interference connected with the third inner surface, and the second outer circumferential surface is interference connected with the second inner surface, so that the interference connection section of the first outer circumferential surface and the third inner surface forms a closed connection.

[0022] As an optional solution, any one of the first outer circumferential surface, the second outer circumferential surface, the second inner surface and the third inner surface is a profiled surface.

[0023] As an optional solution, a second insulating layer is provided on the second outer circumferential surface and / or the second inner surface.

[0024] A power-assisted vehicle comprises the mid-mounted motor installation structure as described above.

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

[0026] By installing the outer shell of the mid-mounted motor in the accommodating space of the frame, and making the first installation top surface of the outer shell abut against the first end surface in the frame, since at this time there is a large gap between the second installation top surface of the outer shell and the second end surface in the frame; therefore, one end of the adjustment body of the gap adjustment member is interference-connected in the installation hole of the outer shell, and the first elastic member of the gap adjustment member is installed at the other end of the adjustment body; during the process of installing the mid-mounted motor, since the rotation of the adjustment body around the axis is subject to a certain restriction, at this time, as the locking force during the installation process gradually increases, the adjustment body can only move in the installation hole in the direction close to the second end surface under the action of the installation clamping force, so that the first elastic member abuts against the second The end surface can be filled with the installation gap between the frame and the outer shell by the gap adjustment member, so as to ensure that the deformation stress of the frame and the mid-mounted motor is minimized, so as to improve the service life of the mid-mounted motor and the frame; at the same time, due to the addition of the first elastic member, the first elastic member is directly in contact with the frame, so as to avoid the direct contact between the frame and the adjustment body or the outer shell, and avoid the metal friction caused by vibration or impact between the frame and the adjustment body or the outer shell, thereby reducing noise and improving the shock absorption and noise reduction performance of the entire mid-mounted motor installation structure; and, the noise can be reduced without improving the structure of the frame itself, and the difficulty of the frame production process will not be increased. The invention is suitable for the installation of most frames and has a wide range of uses.

[0027] Furthermore, since there may be a certain electrode potential difference among the frame, the outer shell and the adjusting body, galvanic corrosion is likely to occur when exposed to the air and other environments; therefore, a first elastic member with electrical insulation is introduced, and at the same time, a first insulating layer is added to the first end face and / or the first mounting top face, so that the galvanic corrosion conditions cannot be met simultaneously between the metals with various electrode potentials (frame, outer shell, adjusting body), that is, galvanic corrosion cannot be triggered, thereby improving the anti-galvanic corrosion performance of the entire mid-mounted motor mounting structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the central motor installation structure provided in the first embodiment of the utility model;

[0029] Figure 2 It is a structural schematic diagram of a frame provided by Embodiment 1 of the utility model;

[0030] Figure 3 It is a structural schematic diagram of the regulating body provided in the first embodiment of the utility model;

[0031] Figure 4 It is a structural schematic diagram of the first elastic member provided in the first embodiment of the utility model;

[0032] Figure 5 It is a structural schematic diagram of the outer shell provided in the first embodiment of the utility model;

[0033] Figure 6 This is a structural schematic diagram of the central motor installation structure provided by the second embodiment of the present utility model;

[0034] Figure 7 This is a schematic diagram of the structure of the split-type regulating body provided in the second embodiment of the utility model;

[0035] Figure 8 This is a schematic diagram of the structure of the central motor installation structure provided in the third embodiment of the present utility model;

[0036] Fig. 9 This is a schematic diagram of the structure of the central motor installation structure provided by the fourth embodiment of the present utility model;

[0037] Fig.10 This is a structural schematic diagram of the central motor installation structure provided in Embodiment 5 of the present utility model;

[0038] Fig.11 This is a structural schematic diagram of the central motor installation structure provided by the sixth embodiment of the present utility model;

[0039] Fig.12 This is a structural schematic diagram of the central motor installation structure provided by Embodiment 7 of the present utility model;

[0040] Fig.13 This is a structural schematic diagram of the central motor installation structure provided by the eighth embodiment of the present utility model;

[0041] Fig.14 This is a structural schematic diagram of the central motor installation structure provided by Embodiment 9 of the present utility model;

[0042] Fig.15 It is a structural schematic diagram of the central motor installation structure provided in the tenth embodiment of the present utility model.

[0043] Description of reference numerals:

[0044] 1-frame; 11-accommodating space; 12-first end surface; 13-second end surface; 14-first mounting through hole; 15-second mounting through hole;

[0045] 21-outer shell; 211-first mounting top surface; 212-second mounting top surface; 213-mounting hole; 2131-first inner hole; 2132-second inner hole; 2133-second inner surface; 2134-third inner surface; 214-inner threaded hole;

[0046] 3-gap adjustment member; 31-adjustment body; 311-connector; 3111-first outer circumferential surface; 3112-first inner surface; 312-carrying body; 3121-first avoidance through hole; 3122-connecting part; 3123-crimping part; 3124-second outer circumferential surface; 3125-third outer circumferential surface; 3126-installation end surface; 32-first elastic member; 321-second avoidance through hole; 322-fourth outer circumferential surface; 323-abutment bottom surface;

[0047] 30-mounting portion; 301-first mounting surface; 302-second mounting surface; 401-abutting mounting surface; 402-top wall surface;

[0048] 4-first screw; 5-second screw;

[0049] 502 - second elastic member; 503 - nut; 504 - groove; 505 - first blank area; 507 - second blank area; 508 - third blank area. DETAILED DESCRIPTION

[0050] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0051] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features. Throughout the specification, the same reference numerals indicate the same elements.

[0052] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0053] Embodiment 1

[0054] In this embodiment, a mid-mounted motor installation structure and a power-assisted bicycle including the mid-mounted motor installation structure are proposed. The mid-mounted motor installation structure can compensate for the installation gap between the mid-mounted motor and the frame, so that the deformation stress of the mid-mounted motor and the frame is minimized, thereby increasing the service life of the mid-mounted motor and the frame; at the same time, the mid-mounted motor installation structure can also reduce the friction noise generated by the vibration or impact between the mid-mounted motor and the frame, so as to play a role in buffering and noise reduction; and can avoid electrical corrosion in the mid-mounted motor installation structure. Among them, the power-assisted bicycle is specifically an electric power-assisted bicycle, and the mid-mounted motor and the frame are both common structures in existing electric power-assisted bicycles. The working principle of the mid-mounted motor will not be described in detail here.

[0055] Specifically, Figures 1 to 5 As shown, the mid-mounted motor installation structure includes the above-mentioned frame 1, the above-mentioned mid-mounted motor and the gap adjustment member 3; wherein, a receiving space 11 is formed in the frame 1, and the frame 1 has a first end face 12 and a second end face 13 located in the receiving space 11 and arranged oppositely, that is, the first end face 12 and the second end face 13 are arranged in parallel; the mid-mounted motor includes an outer shell 21, which is installed in the receiving space 11, and the outer shell 21 has a first installation top face 211 and a second installation top face 212 arranged oppositely, and in a free state, when the first installation top face 211 of the outer shell 21 abuts against the first end face 12, the outer shell 21 There is a gap between the second mounting top surface 212 and the second end surface 13; a mounting hole 213 is provided on the second mounting top surface 212 of the outer shell 21; the gap adjustment member 3 includes an adjustment body 31 and a first elastic member 32, one end of the adjustment body 31 is interference connected in the mounting hole 213, and the first elastic member 32 is fixedly mounted on the other end of the adjustment body 31; and the adjustment body 31 can drive the first elastic member 32 to move in the mounting hole 213 toward the second end surface 13, thereby filling the gap between the second mounting top surface 212 and the second end surface 13, so that the first elastic member 32 abuts against the second end surface 13.

[0056] Compared with the prior art, the central motor mounting structure in the first embodiment can not only adjust the mounting gap between the frame 1 and the outer shell 21, but also add a first elastic member 32 for shock absorption and noise reduction; by mounting the outer shell 21 of the central motor in the accommodating space 11 of the frame 1, and making the first mounting top surface 211 of the outer shell 21 abut against the first end surface 12 in the frame 1, since at this time there is a large gap between the second mounting top surface 212 of the outer shell 21 and the second end surface 13 in the frame 1; therefore, one end of the adjusting body 31 of the gap adjusting member 3 is interference-connected in the mounting hole 213 of the outer shell 21, and the gap The first elastic member 32 of the gap adjustment member 3 is installed at the other end of the adjustment body 31; when installing the mid-mounted motor, because the rotation of the adjustment body 31 around the axis is subject to a certain restriction, at this time, as the locking force of the mounting screws gradually increases, the adjustment body 31 can only move in the mounting hole 213 toward the second end face under the action of the screw clamping force, so that the first elastic member 32 abuts against the second end face 13, so that the installation gap between the frame 1 and the outer shell 21 can be compensated by the gap adjustment member 3, ensuring that the deformation stress of the frame 1 and the mid-mounted motor is minimized, so as to increase the service life of the mid-mounted motor and the frame 1.

[0057] At the same time, by adding a first elastic member 32 so that the first elastic member 32 is in direct contact with the frame 1, the frame 1 is prevented from directly contacting with the adjustment body 31 or the outer shell 21, and the metal friction caused by vibration or impact between the frame 1 and the adjustment body 31 or the outer shell 21 is avoided, thereby reducing noise and improving the shock absorption and noise reduction performance of the entire mid-mounted motor installation structure; and, the noise can be reduced without improving the structure of the frame 1 itself, and the difficulty of the frame 1 production process will not be increased. It is suitable for the installation of most frames 1 and has a wide range of uses. It is worth noting that the installation of the frame 1 and the mid-mounted motor involved above actually refers to the installation between the frame 1 and the outer shell 21 of the mid-mounted motor; other structures of the mid-mounted motor connected to the outer shell 21 are not described in detail. The specific structure of the frame 1 is described in detail below:

[0058] Specifically, Figure 1 and Figure 2 As shown, the accommodating space 11 in the frame 1 is an inverted U-shaped cavity, the outer shell 21 and the gap adjustment member 3 respectively accommodate the interior of the space 11, and a first mounting through hole 14 and a second mounting through hole 15 are respectively provided at opposite ends of the frame 1, the first mounting through hole 14 and the first end face 12 are located on the same side, the second mounting through hole 15 and the second end face 13 are located on the other side, the first mounting through hole 14 and the second mounting through hole 15 are respectively connected to the accommodating space 11, and the first mounting through hole 14 and the second mounting through hole 15 are coaxial.

[0059] Furthermore, if Figure 1 As shown, the mid-mounted motor mounting structure also includes a first screw 4 and a second screw 5; wherein the first screw 4 is used to pass through the first mounting through hole 14 and is threadedly connected in the outer shell 21 to fix the outer shell 21 at the first end face 12; the second screw 5 is used to sequentially pass through the second mounting through hole 15 and the first elastic member 32 and is threadedly connected in the adjustment body 31, and the adjustment body 31 can move toward the direction approaching the second end face 13 under the action of the threaded clamping force of the second screw 5, so that the first elastic member 32 is pressed against the second end face 13, thereby enabling the gap adjustment member 3 to make up for the installation gap between the second end face 13 and the outer shell 21, and there is no need to improve the structure of the frame 1 itself, that is, there is no need to increase the difficulty of the production process of the frame 1.

[0060] Specifically, the materials of the first screw 4 and the second screw 5 can be steel or aluminum. Preferably, the materials of the first screw 4 and the second screw 5 are steel, such as carbon steel or stainless steel; optionally, the specifications of the first screw 4 and the second screw 5 are not necessarily the same. Preferably, the specifications of the first screw 4 and the second screw 5 are the same.

[0061] Specifically, the material of the frame 1 can be aluminum alloy or carbon fiber. Preferably, the material of the frame 1 is aluminum alloy with good corrosion resistance and strength; and the first mounting through hole 14 and the second mounting through hole 15 can be independent components. Preferably, the first mounting through hole 14 and the second mounting through hole 15 are an integral structure with the frame 1; optionally, the structures of the first mounting through hole 14 and the second mounting through hole 15 are not necessarily the same. Preferably, the structures of the first mounting through hole 14 and the second mounting through hole 15 are the same.

[0062] The specific structure of the regulating body 31 is described in detail below:

[0063] Specifically, Figure 1 and Figure 3 As shown, the adjustment body 31 includes a connecting body 311 and a carrier body 312; wherein the connecting body 311 is arranged close to the outer shell 21, the connecting body 311 has a first outer circumferential surface 3111 and a first inner surface 3112, an internal thread is arranged on the first inner surface 3112, and the internal thread matches the second screw 5; a first avoidance through hole 3121 for the second screw 5 to pass through is arranged in the carrier body 312, so that the carrier body 312 can avoid the second screw 5, so that the second screw 5 can be connected to the internal thread of the first inner surface 3112 by threading; the carrier body 312 includes a connecting portion 3122 and a crimping portion 3123 connected to each other, the connecting portion 3122 is connected to a side of the connecting body 311 away from the outer shell 21, and the first elastic member 32 is fixedly connected to a side of the crimping portion 3123 that is not connected to the connecting portion 3122, that is, the crimping portion 3123 has a mounting end surface 3126, and the first elastic member 32 is connected and mounted on the mounting The connecting body 311 and the connecting portion 3122 are both interference-connected in the mounting hole 213 to achieve the connection between the adjusting body 31 and the outer shell 21; the connecting portion 3122 has a second outer circumferential surface 3124, and the crimping portion 3123 has a third outer circumferential surface 3125, the second outer circumferential surface 3124 is higher than the first outer circumferential surface 3111, so that the connection between the connecting body 311 and the connecting portion 3122 forms a first step, and the third outer circumferential surface 3125 is formed. 125 is higher than the second outer circumferential surface 3124, so that a second step is formed at the connection between the connecting portion 3122 and the crimping portion 3123, so that the connecting body 311 and the carrier 312 can match the mounting hole 213, so that when the connecting body 311 and the connecting portion 3122 are interference-fitted into the mounting hole 213, the second step at the crimping portion 3123 can be located at the second mounting top surface 212 of the outer shell 21 or abut against the second mounting top surface 212 of the outer shell 21. Among them, the first avoidance through hole 3121 inside the carrier 312 is a cylindrical structure.

[0064] Specifically, the connecting body 311 and the supporting body 312 are an integrated structure or a split structure. Figure 3 As shown, the connecting body 311 and the supporting body 312 are an integrated structure, so as to facilitate the connection stability of the adjusting body 31 and save the assembly steps between the connecting body 311 and the supporting body 312. Optionally, the material of the adjusting body 31 can be metal or non-metal. Preferably, the adjusting body 31 is made of carbon steel.

[0065] Furthermore, the material of the connector 311 and the carrier 312 can be metal (such as magnesium alloy, aluminum alloy, carbon steel, etc.) or non-metal; preferably, the connector 311 and the carrier 312 are on the same component, and the materials of the connector 311 and the carrier 312 are both carbon steel.

[0066] Specifically, optionally, the third outer circumferential surface 3125 may be a cylindrical surface, or a profiled surface, such as a surface with an axial cutting groove, such as a knurling structure, etc. Preferably, the third outer circumferential surface 3125 is a cylindrical surface without a knurling structure.

[0067] The specific structure of the first elastic member 32 is described in detail below:

[0068] Furthermore, the material of the first elastic member 32 is non-metal, such as an elastic element or a memory element, which is not limited here, as long as the first elastic member 32 has an elastic rebound effect. In this embodiment, the first elastic member 32 is specifically made of high-hardness rubber.

[0069] Among them, Figure 1 and Figure 4 As shown, a second avoidance through hole 321 is provided inside the first elastic member 32, so that the second screw 5 can sequentially pass through the second avoidance through hole 321 and the first avoidance through hole 3121 and then be threadedly connected to the internal thread of the first inner surface 3112. Preferably, the second avoidance through hole 321 is a cylindrical structure.

[0070] Specifically, the fourth outer circumferential surface 322 of the first elastic member 32 may be a cylindrical surface or a profiled surface. Preferably, the fourth outer circumferential surface 322 of the first elastic member 32 is a cylindrical surface; and after the first elastic member 32 is mounted on the adjustment body 31, the abutting bottom surface 323 of the first elastic member 32 is tightly attached to the mounting end surface 3126 of the crimping portion 3123.

[0071] Alternatively, if Figure 1 and Figure 4As shown, the abutting bottom surface 323 of the first elastic member 32 and the mounting end surface 3126 of the crimping portion 3123 can be bonded by gluing or vulcanization, or can be connected by a structure such as overmolding. Preferably, the abutting bottom surface 323 of the first elastic member 32 and the mounting end surface 3126 of the crimping portion 3123 are connected and fixed by a vulcanization process, so that the installation between the first elastic member 32 and the crimping portion 3123 is relatively simple and convenient, and the connection stability between the first elastic member 32 and the crimping portion 3123 can be ensured.

[0072] Furthermore, the first elastic member 32 also has an anti-salt spray function, that is, the first elastic member 32 is subjected to an anti-salt spray surface treatment so that the first elastic member 32 can be used for a long time in a high-salt environment without being corroded, thereby ensuring that the first elastic member 32 has good corrosion resistance and a long service life, thereby ensuring the reliability and stability of the first elastic member 32 in achieving the anti-vibration and noise reduction functions.

[0073] The structure of the outer shell 21 is described in detail below:

[0074] like Figure 1 and Figure 5 As shown, an internal threaded hole 214 is also provided in the outer shell 21, and the mounting hole 213 is separated from the internal threaded hole 214. The first screw 4 passes through the first mounting through hole 14 and is threadedly connected to the internal threaded hole 214 to fix the outer shell 21 in the accommodating space 11 and make the first mounting top surface 211 abut against the first end surface 12.

[0075] It is worth noting that if two materials with different electrode potentials are in direct contact or conduction and are located in an electrolyte environment at the same time, macroscopic primary cell corrosion, i.e., galvanic corrosion, will occur. At this time, the more active metal will be corroded faster, making it more likely that the more active metal (usually the outer shell 21) will be prone to galvanic corrosion in actual applications, thereby greatly shortening the service life of the outer shell 21.

[0076] In order to solve the above problems, Figure 1 and Figure 5 As shown, a first insulating layer is provided on the first end face 12 of the frame 1 and / or the first mounting top face 211 of the outer shell 21. By providing the first insulating layer, the first end face 12 can be insulated and separated from the first mounting top face 211, thereby avoiding direct contact between the first end face 12 and the first mounting top face 211, thereby avoiding galvanic corrosion of the outer shell 21, and improving the service life of the outer shell 21.

[0077] Specifically, the first end surface 12 may be coated or provided with a first insulating layer, such as an insulating coating, a detachable or removable waterproof insulating layer such as rubber / plastic, grease, etc.; preferably, the first insulating layer is not coated on the first end surface 12. Correspondingly, a first insulating layer is provided on the first mounting top surface 211 of the outer shell 21.

[0078] Furthermore, the material of the outer shell 21 is metal, which can be magnesium alloy or other metals more active than aluminum. Preferably, the material of the outer shell 21 is magnesium-aluminum alloy, that is, the metal activity of the outer shell 21 is higher than that of the frame 1 and the adjustment body 31.

[0079] Specifically, Figure 5 As shown, the mounting hole 213 includes a first inner hole 2131 and a second inner hole 2132 which are coaxially arranged, the second inner hole 2132 is arranged close to the internal threaded hole 214, the first inner hole 2131 has a second inner surface 2133, the second inner hole 2132 has a third inner surface 2134, the first outer circumferential surface 3111 is interference-connected with the third inner surface 2134, and the second outer circumferential surface 3124 is interference-connected with the second inner surface 2133, thereby ensuring the connection stability between the regulating body 31 and the outer shell 21. At this time, the interference connection section of the first outer circumferential surface 3111 and the third inner surface 2134 forms a closed connection.

[0080] It is worth noting that the interference connection force between the first outer circumferential surface 3111 and the third inner surface 2134, and between the second outer circumferential surface 3124 and the second inner surface 2133 is smaller than the deformation stress of the frame 1, thereby ensuring that the frame 1 will not be deformed under the clamping force of the second screw 5, and the connecting body 311 and the connecting portion 3122 can move in the mounting hole 213 toward the second end face 13, so that the first elastic member 32 abuts against the second end face 13.

[0081] Further, any one of the first outer circumferential surface 3111, the second outer circumferential surface 3124, the second inner surface 2133 and the third inner surface 2134 is a profiled surface, so that the problem of the adjustment body 31 rotating in the mounting hole 213 can be avoided by the profiled surface, so that the rotation of the adjustment body 31 in the mounting hole 213 can be limited. The profiled surface specifically refers to a surface with an axial cutting groove, such as a knurled structure.

[0082] Specifically, the first outer circumferential surface 3111 can be a cylindrical surface or a profiled surface; preferably, the first outer circumferential surface 3111 is a cylindrical surface; the second outer circumferential surface 3124 can be a cylindrical surface or a profiled surface; preferably, the second outer circumferential surface 3124 is a knurled cylindrical surface, that is, the second outer circumferential surface 3124 is a profiled surface; correspondingly, the second inner surface 2133 and the third inner surface 2134 are both cylindrical surfaces without a knurled structure.

[0083] Furthermore, a second insulating layer is provided on the second outer circumferential surface 3124 and / or the second inner surface 2133; by providing the second insulating layer, the second outer circumferential surface 3124 can be insulated and separated from the second inner surface 2133, thereby avoiding direct contact between the second outer circumferential surface 3124 and the second inner surface 2133, thereby avoiding galvanic corrosion of the outer shell 21, and further improving the service life of the outer shell 21.

[0084] Specifically, the second outer circumferential surface 3124 may be coated or carried with a second insulating layer, such as an insulating coating, a detachable or removable waterproof insulating layer such as rubber / plastic, grease, etc. Preferably, the second outer circumferential surface 3124 is coated with a second insulating layer. Correspondingly, the second inner surface 2133 is not coated with a second insulating layer.

[0085] It is worth noting that although the first outer circumferential surface 3111 and the third inner surface 2134 are also in direct contact, since the second outer circumferential surface 3124 located on the outside and the second inner surface 2133 are in interference connection, the first outer circumferential surface 3111 and the third inner surface 2134 will not be exposed to the electrolyte environment, thereby ensuring that there will be no galvanic corrosion problem between the first outer circumferential surface 3111 and the third inner surface 2134.

[0086] It is worth noting that the vehicle frame 1, the outer shell 21 and the adjustment body 31 are made of different metal materials; and the first end face 12 and the second end face 13 of the vehicle frame 1 include a first material having a first standard electrode potential, the first mounting top face 211, the second mounting top face 212 and the mounting hole 213 of the outer shell 21 include a second material having a second standard electrode potential, the adjustment body 31 includes a third material having a third standard electrode potential, and the first elastic member 32 includes a fourth material having electrical insulation; and the difference between the first standard electrode potential and the second standard electrode potential, and the difference between the first standard electrode potential and the third standard electrode potential are respectively smaller than the difference between the second standard electrode potential and the third standard electrode potential; therefore, there may be a certain electrode potential difference between the vehicle frame 1, the outer shell 21 and the adjustment body 31, which is prone to galvanic corrosion when exposed to air and other environments.

[0087] To this end, in this embodiment, a first elastic member 32 including a fourth material with electrical insulation is introduced, and at the same time, a second insulating layer is provided on the second outer circumferential surface 3124 and / or the second inner surface 2133, and a first insulating layer is provided on the first end surface 12 and / or the first mounting top surface 211, and the interference fit between the first outer circumferential surface 3111 and the third inner surface 2134 forms a closed connection between the second outer circumferential surface 3124 and the second inner surface 2133. Based on the above conditions, the galvanic corrosion conditions cannot be met simultaneously between the electrode potential metals (the frame 1, the outer shell 21, and the adjustment body 31), that is, the galvanic corrosion cannot be triggered, thereby improving the anti-galvanic corrosion performance of the entire mid-mounted motor mounting structure.

[0088] It is worth noting that the first elastic member 32 including the fourth material having electrical insulation specifically means that the first elastic member 32 itself is an insulating material, or an insulating material is coated on the outer surface of the first elastic member 32, which is not specifically limited here.

[0089] The specific installation process of the central motor installation structure in the first embodiment is as follows:

[0090] In the first step, the abutting bottom surface 323 of the first elastic member 32 is tightly mounted on the mounting end surface 3126 of the crimping portion 3123 ; the first outer circumferential surface 3111 is interference-connected to the third inner surface 2134 , and the second outer circumferential surface 3124 is interference-connected to the second inner surface 2133 .

[0091] In the second step, the outer shell body 21 connected with the gap adjustment member 3 is arranged in the accommodating space 11, and the first screw 4 is passed through the first mounting through hole 14 and the first end face 12 and threadedly connected to the internal threaded hole 214, so that the internal threaded hole 214 side of the outer shell body 21 is locked to the first mounting through hole 14 of the frame 1, so that the first mounting top surface 211 of the outer shell body 21 is fitted and abutted against the first end face 12.

[0092] In the third step, the second screw 5 is passed through the second mounting hole 15, the second avoidance hole 321, and the first avoidance hole 3121 in sequence and threadedly connected to the internal thread of the first inner surface 3112, and finally the first inner hole 2131 side of the outer shell 21 is connected to the second mounting hole 15, so that the first elastic member 32 fits and abuts against the second end face 13.

[0093] In the first step mentioned above, the first outer circumferential surface 3111 and the third inner surface 2134 are in interference fit and direct contact; the second outer circumferential surface 3124 and the second inner surface 2133 are in interference fit and in indirect contact, and the knurled structure on the second outer circumferential surface 3124 is riveted with the second inner surface 2133, thereby realizing the circumferential anti-rotation function between the second outer circumferential surface 3124 and the second inner surface 2133, while squeezing the second insulating layer coated on the second outer circumferential surface 3124 to realize the waterproof and anti-galvanic corrosion functions; and, after repeated disassembly and assembly of the mid-mounted motor mounting structure, due to the small wear of the second insulating layer, the second insulating layer still exists and is thick enough, and the interference fit effect between the second outer circumferential surface 3124 and the second inner surface 2133 can still be guaranteed.

[0094] In the above-mentioned second step, a clamping force is generated after the internal threaded hole 214 in the outer shell 21 is connected by the first screw 4, and the clamping force can make the first mounting top surface 211 of the outer shell 21 fit tightly with the first end surface 12; at the same time, the first insulating layer coated on the first mounting top surface 211 can achieve the functions of waterproofing and anti-galvanic corrosion between the first end surface 12 and the first mounting top surface 211; and, after repeated disassembly and assembly of the mid-mounted motor mounting structure, due to the small wear of the first insulating layer, the first insulating layer still exists and is thick enough, and the insulation effect between the first mounting top surface 211 and the first end surface 12 can still be guaranteed.

[0095] In the third step, a clamping force is generated after the second screw 5 is connected to the internal thread of the first inner surface 3112, and the clamping force can make the first elastic member 32 and the adjusting body 31 move toward the second end face 13; at this time, the connecting body 311 is gradually pulled out from the second inner hole 2132, and the connecting part 3122 is gradually pulled out from the first inner hole 2131, so that the gap adjusting member 3 is in a disassembled state; and the vehicle frame 1 is hardly deformed during the whole process, until the first elastic member 32 is pressed against the second end face 13 under the action of the assembly clamping force of the second screw 5; at this time, the installation gap between the frame 1 and the outer shell 21 is completely filled by the gap adjusting member 3, which plays a gap adjustment function.

[0096] Furthermore, in the third step, while the first elastic member 32 is pressed against the second end face 13, there is still a partial connection between the second outer circumferential surface 3124 and the second inner surface 2133, that is, there is still an interference connection between the second outer circumferential surface 3124 and the second inner surface 2133, and the contact is indirect. The second insulating layer coated on the second outer circumferential surface 3124 is squeezed simultaneously through the interference connection between the second outer circumferential surface 3124 and the second inner surface 2133, so that the outer shell 21 still has the functions of waterproofing and anti-galvanic corrosion after installation.

[0097] At the same time, in the above-mentioned third step, since the first elastic member 32 is arranged between the frame 1 and the crimping portion 3123 of the adjustment body 31, it can reduce the friction noise or abnormal sound generated by vibration or impact between the frame 1 and the crimping portion 3123, that is, the introduction of the first elastic member 32 can achieve the shock absorption and noise reduction function without changing the structure of the frame 1 itself.

[0098] The mid-mounted motor installation structure in the first embodiment of the present invention is configured with an adjustment body 31 between the frame 1 and the outer shell 21, so that the adjustment body 31 can move relative to the outer shell 21 toward the second end surface 13 until the adjustment body 31 and the first elastic member 32 fill the installation gap between the frame 1 and the outer shell 21, thereby improving the stress conditions of the outer shell 21 of the mid-mounted motor and the frame 1, and increasing the service life of the mid-mounted motor and the frame 1, and without changing the structure of the frame 1 itself, so that the mid-mounted motor installation structure can be applied to most frames 1 for installation; and by configuring the first elastic member 32 The elastic member 32 makes the first elastic member 32 tightly attached between the second end face 13 and the crimping portion 3123, that is, the first elastic member 32 is used to separate the frame 1 from the adjustment body 31, so as to achieve the effects of shock absorption and noise reduction; at the same time, a second insulating layer is provided on the second outer circumferential surface 3124 to insulate and separate the second outer circumferential surface 3124 from the second inner surface 2133; and a first insulating layer is provided on the first mounting top surface 211 to insulate and separate the first end face 12 from the first mounting top surface 211, thereby achieving the functions of waterproofing and anti-galvanic corrosion to eliminate galvanic corrosion between different metals.

[0099] Embodiment 2

[0100] The central motor installation structure in this embodiment is basically the same as the central motor installation structure in the first embodiment, except that, in the central motor installation structure in this embodiment, Figure 6 and Figure 7 As shown, the connecting body 311 and the supporting body 312 of the adjusting body 31 are split structures; specifically, the connecting body 311 and the supporting body 312 are separate components, and the connecting body 311, in addition to the first outer circumferential surface 3111 and the first inner surface 3112 described in the first embodiment, also includes a mounting portion 30, and the mounting portion 30 is located on the side of the first outer circumferential surface 3111 close to the supporting body 312, and the mounting portion 30 has a first mounting surface 301 and a second mounting surface 302; and the supporting body 312 includes the crimping portion 3123 and the connecting portion 3122 described in the above-mentioned first embodiment, and the connecting portion 3122, in addition to the structure described in the above-mentioned first embodiment, is also provided with abutting mounting surface 401.

[0101] Specifically, if Figure 7As shown, during the installation of the connecting body 311 and the carrier 312, the mounting portion 30 is located in the first avoidance through hole 3121 in the connecting portion 3122, and the first mounting surface 301 is abutted against the top wall surface 402 inside the first avoidance through hole 3121, and the second mounting surface 302 is abutted against the abutting mounting surface 401, so that the connecting body 311 and the carrier 312 can be connected into an integral structure. The first mounting surface 301 and the top wall surface 402, and the second mounting surface 302 and the abutting mounting surface 401 can be connected by riveting, welding, or bonding, etc., which are not limited here.

[0102] It is worth noting that the connection strength between the mounting portion 30 and the connecting portion 3122 needs to be greater than the interference connection strength between the gap adjustment member 3 and the outer shell 21, so as to ensure that in actual application, the connecting portion 3122 and the connecting body 311 can be pulled out from the mounting hole 213, and the connecting portion 3122 and the mounting portion 30 will not be detached from each other, thereby ensuring the structural integrity of the entire adjustment body 31.

[0103] Embodiment 3

[0104] The central motor installation structure in this embodiment has the same installation principle as that in the second embodiment, except that, in the central motor installation structure in this embodiment, Figure 8 As shown, the connecting body 311 and the bearing body 312 of the adjusting body 31 are split structures; specifically, the connecting body 311 and the bearing body 312 are separate components, wherein the bearing body 312 extends to the circumferentially enveloping connecting body 311, and the bearing body 312 and the outer shell 21 are made of the same material, so that galvanic corrosion will not occur between the adjusting member 3 and the outer shell 21, and there is no need to add a second insulating layer on the bearing body 312 to reduce the surface treatment steps of the bearing body 312; and the connecting body 311 and the outer shell 21 are made of different materials (for example, steel), and the elastic The structural design of part 32, such as the temporary sealing film added on the top surface, can achieve galvanic corrosion-free application for the first time. At this time, the structure does not require any surface treatment. However, considering that the connector 311 and the carrier 312 will be affected by galvanic corrosion after the film fails, repeated disassembly and assembly are not supported; or the second avoidance through hole 321 of the elastic part 32 is interference fitted with the mounting screw 5, and the second avoidance through hole 321 of the elastic part 32 is in a closed state after the mounting screw 5 is removed. At this time, galvanic corrosion-free can be achieved, the structure does not require any surface treatment, and supports repeated disassembly and assembly.

[0105] Embodiment 4

[0106] The central motor installation structure in this embodiment has the same installation principle as that in the second embodiment, except that, in the central motor installation structure in this embodiment, Fig. 9As shown, the connecting body 311 and the carrier 312 of the adjusting body 31 are split structures, and the connecting body 311 and the carrier 312 can be connected by bonding, riveting or welding; and the entire carrier 312 is made of the same material as the outer shell 21, so that galvanic corrosion will not occur between the adjusting member 3 and the outer shell 21, and there is no need to add a second insulating layer on the carrier 312 to reduce the surface treatment steps of the carrier 312; and the connecting body 311 and the outer shell 21 are made of different materials (for example, steel), and the elastic part 32 is matched with the structure Design, such as a temporary sealing film added to the top surface, can achieve galvanic corrosion-free initial use. At this time, the structure does not require any surface treatment. However, considering that the connector 311 and the carrier 312 will be affected by galvanic corrosion after the film fails, repeated disassembly and assembly are not supported; or the second avoidance through hole 321 of the elastic part 32 is interference fitted with the mounting screw 5, and after the mounting screw 5 is removed, the second avoidance through hole 321 of the elastic part 32 is in a closed state. At this time, galvanic corrosion-free can be achieved, the structure does not require any surface treatment, and supports repeated disassembly and assembly.

[0107] Embodiment 5

[0108] The central motor installation structure in this embodiment is basically the same as the central motor installation structure in the first embodiment, except that, in the central motor installation structure in this embodiment, Fig.10 As shown, there is no need to set a second insulating layer on the second outer circumferential surface 3124, and the materials of the adjustment body 31 and the outer shell 21 are different. A third insulating layer is set on the second mounting top surface 212 of the outer shell 21 close to the first elastic member 32, and a second elastic member 502 is set between the third insulating layer and the crimping portion 3123 to provide a sealing effect between the second outer circumferential surface 3124 and the second inner surface 2133, ensuring that the second outer circumferential surface 3124 and the second inner surface 2133 will not contact the electrolyte environment, thereby ensuring that no galvanic corrosion will occur between the second outer circumferential surface 3124 and the second inner surface 2133.

[0109] Embodiment 6

[0110] The central motor installation structure in this embodiment is basically the same as the central motor installation structure in the first embodiment, except that, in the central motor installation structure in this embodiment, Fig.11As shown, the second insulating layer does not need to be provided on the second outer circumferential surface 3124, and the materials of the adjustment body 31 and the outer shell 21 are different, and a nut 503 is connected to the third outer circumferential surface 3125 of the crimping portion 3123, and the nut 503 extends in the direction close to the outer shell 21, and a groove 504 is also provided on the outer shell 21, and the nut 503 is located in the groove 504, and a fourth insulating layer is provided on the second mounting top surface 212 outside the groove 504. Among them, only one of the nut 503 and the second mounting top surface 212 needs to be insulated to prevent galvanic corrosion.

[0111] And, if Fig.11 As shown, a first blank area 505 is formed below the nut 503 and between the second mounting top surface 212 of the outer shell 21 and the groove 504. The first blank area 505 is filled with an insulating medium, such as waterproof grease, which can completely isolate the contact portion between the second outer circumferential surface 3124 and the second inner surface 2133 from the electrolyte environment. Combined with the fourth insulating layer, galvanic corrosion between the second outer circumferential surface 3124 and the second inner surface 2133 can be effectively prevented; moreover, the insulating medium in the first blank area 505 can also ensure a good sealing and isolation effect between the second outer circumferential surface 3124 and the second inner surface 2133 during the process of the gap adjustment member 3 being pulled out toward the second end surface 13 relative to the outer shell 21.

[0112] Embodiment 7

[0113] The central motor installation structure in this embodiment is basically the same as the central motor installation structure in the sixth embodiment, except that, in the central motor installation structure in this embodiment, Fig.12 As shown, a second blank area 507 is formed between the nut 503 and the groove 504, and the second blank area 507 is filled with an insulating medium, such as grease, so as to better ensure the sealing and insulating effect between the second outer circumferential surface 3124 and the second inner surface 2133, and better avoid galvanic corrosion between the second outer circumferential surface 3124 and the second inner surface 2133; moreover, the insulating medium in the second blank area 507 can also ensure a good sealing and insulating effect between the second outer circumferential surface 3124 and the second inner surface 2133 during the process of the gap adjustment member 3 being pulled out toward the second end face 13 relative to the outer shell 21.

[0114] Embodiment 8

[0115] The central motor installation structure in this embodiment is basically the same as the central motor installation structure in the first embodiment, except that, in the central motor installation structure in this embodiment, Fig.13As shown, there is no need to set a second insulating layer on the second outer circumferential surface 3124, and the materials of the adjustment body 31 and the outer shell 21 are different. A second insulating layer is set on the second outer circumferential surface 3124 and the third outer circumferential surface 3125, and a third blank area 508 is set at one end of the connector 311 close to the outer shell 21. The third blank area 508 is filled with an insulating medium, such as grease, to ensure that the internal contact parts of the outer shell 21 and the connector 311 are isolated from the electrolyte environment and no galvanic corrosion occurs.

[0116] Embodiment 9

[0117] The central motor installation structure in this embodiment is basically the same as the central motor installation structure in the eighth embodiment, except that, in the central motor installation structure in this embodiment, Fig.14 As shown, there is no knurling structure on the first outer circumferential surface 3111, so that the first outer circumferential surface 3111 and the third inner surface 2134 are directly connected by interference fit; and, a hexagonal structure is provided on the second outer circumferential surface 3124, so that the second outer circumferential surface 3124 and the second inner surface 2133 are connected by interference fit, thereby ensuring the circumferential anti-rotation function of the connecting portion 3122 in the first inner hole 2131 through the hexagonal structure on the second outer circumferential surface 3124.

[0118] Embodiment 10

[0119] The central motor installation structure in this embodiment is basically the same as the central motor installation structure in the eighth embodiment, except that, in the central motor installation structure in this embodiment, Fig.15 As shown, the crimping portion 3123 is not provided in the adjusting body 31 , that is, the adjusting body 31 includes the connecting portion 3122 and the connecting body 311 which are integrally formed.

[0120] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A mid-mounted motor installation structure, characterized in that: include: A vehicle frame (1), wherein a receiving space (11) is formed in the vehicle frame (1), and the vehicle frame (1) has a first end surface (12) and a second end surface (13) which are located in the receiving space (11) and are arranged opposite to each other; A mid-mounted motor comprises an outer shell (21), wherein the outer shell (21) is installed in the accommodating space (11), and in a free state, when a first installation top surface (211) of the outer shell (21) abuts against the first end surface (12), a gap exists between a second installation top surface (212) of the outer shell (21) and the second end surface (13); and a mounting hole (213) is provided on the second installation top surface (212); A gap adjustment member (3), comprising an adjustment body (31) and a first elastic member (32), wherein one end of the adjustment body (31) is interference-connected to the mounting hole (213), and the first elastic member (32) is mounted to the other end of the adjustment body (31), and the adjustment body (31) can drive the first elastic member (32) to move in the mounting hole (213) toward the second end surface (13), thereby filling the gap between the second mounting top surface (212) and the second end surface (13), so that the first elastic member (32) abuts against the second end surface (13); The first elastic member (32) has electrical insulation properties, and a first insulating layer is provided on the first end surface (12) and / or the first mounting top surface (211).

2. The mid-mounted motor installation structure according to claim 1, characterized in that: The outer shell (21) and the gap adjustment member (3) are respectively located inside the accommodating space (11), and a first mounting through hole (14) and a second mounting through hole (15) are respectively provided at opposite ends of the frame (1), the first mounting through hole (14) and the first end surface (12) are located on one side, and the second mounting through hole (15) and the second end surface (13) are located on the other side, the first mounting through hole (14) and the second mounting through hole (15) are respectively connected to the accommodating space (11), and the first mounting through hole (14) and the second mounting through hole (15) are coaxial.

3. The mid-mounted motor installation structure according to claim 2, characterized in that: The mid-mounted motor installation structure also includes: a first screw (4), the first screw (4) being used to pass through the first mounting through hole (14) and be connected to the outer shell (21) by threading, so as to fix the outer shell (21) to the first end surface (12); A second screw (5), the second screw (5) is used to pass through the second mounting through hole (15) and the first elastic member (32) in sequence and be connected to the adjustment body (31) through a thread, and the adjustment body (31) can move towards the second end face (13) under the action of the thread clamping force of the second screw (5) so that the first elastic member (32) is pressed against the second end face (13).

4. The mid-mounted motor installation structure according to claim 3, characterized in that: The regulating body (31) comprises: a connecting body (311) disposed close to the outer shell (21), the connecting body (311) having a first outer circumferential surface (3111) and a first inner surface (3112), the first inner surface (3112) being provided with an internal thread, and the internal thread being matched with the second screw (5); A carrier (312), wherein a first avoidance through hole (3121) for the second screw (5) to pass through is arranged in the carrier (312), the carrier (312) comprises a connecting portion (3122) and a crimping portion (3123) connected to each other, the connecting portion (3122) being connected to a side of the connecting body (311) away from the outer shell (21), the first elastic member (32) being connected to a side of the crimping portion (3123) not connected to the connecting portion (3122), and the connecting body (311) and the connecting portion (3122) are both interference-connected to The connecting portion (3122) has a second outer circumferential surface (3124), and the crimping portion (3123) has a third outer circumferential surface (3125). The second outer circumferential surface (3124) is higher than the first outer circumferential surface (3111), so that a first step is formed at the connection between the connecting body (311) and the connecting portion (3122), and the third outer circumferential surface (3125) is higher than the second outer circumferential surface (3124), so that a second step is formed at the connection between the connecting portion (3122) and the crimping portion (3123).

5. The mid-mounted motor installation structure according to claim 4, characterized in that: The connecting body (311) and the supporting body (312) are of an integrated structure or a split structure.

6. The mid-mounted motor installation structure according to claim 4, characterized in that: The outer shell (21) is also provided with an internal threaded hole (214); the mounting hole (213) is spaced apart from and coaxial with the internal threaded hole (214); the first screw (4) passes through the first mounting through hole (14) and is threadedly connected to the internal threaded hole (214) so ​​as to mount the outer shell (21) in the accommodating space (11) and enable the first mounting top surface (211) to abut against the first end surface (12).

7. The mid-mounted motor installation structure according to claim 6, characterized in that: The mounting hole (213) comprises a first inner hole (2131) and a second inner hole (2132) which are coaxially arranged, wherein the second inner hole (2132) is arranged close to the internal threaded hole (214), the first inner hole (2131) has a second inner surface (2133), the second inner hole (2132) has a third inner surface (2134), the first outer circumferential surface (3111) is interference-connected with the third inner surface (2134), and the second outer circumferential surface (3124) is interference-connected with the second inner surface (2133), so that the interference connection section between the first outer circumferential surface (3111) and the third inner surface (2134) forms a sealed connection.

8. The mid-mounted motor installation structure according to claim 7, characterized in that: Any one of the first outer circumferential surface (3111), the second outer circumferential surface (3124), the second inner surface (2133) and the third inner surface (2134) is a profiled surface.

9. The mid-mounted motor installation structure according to claim 7, characterized in that: A second insulating layer is provided on the second outer circumferential surface (3124) and / or the second inner surface (2133).

10. A power-assisted vehicle, characterized in that: It comprises a mid-mounted motor mounting structure as claimed in any one of claims 1 to 9.

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