A flat fork structure suitable for a middle motor of an electric motorcycle

Abstract

The utility model relates to electric motorcycle technical field, especially suitable for electric motorcycle middle -position motor's flat fork structure, including the flat fork body for installing middle -position motor, the flat fork body is iron flat fork body, the bottom fixed setting of flat fork body is used for supporting the support frame of flat fork body, and the connecting point of support frame with flat fork body is the connecting point of flat fork body and the frame of electric motorcycle, through above technical scheme, the utility model solves the problem that the cost of electric motorcycle is bigger because the flat fork structure of aluminium alloy is usually selected in the prior art electric motorcycle.

Description

Technical Field

[0001] This utility model relates to a flat fork structure, specifically a flat fork structure suitable for a mid-mounted motor in an electric motorcycle. Background Technology

[0002] There are generally two ways to install a mid-drive motor. One is to directly mount the mid-drive motor onto the frame of the electric motorcycle. Since the mid-drive motor is fixed to the frame, when the electric motorcycle encounters uneven road surfaces and bumps, the rear wheel and the swingarm will rotate around the rear swingarm according to the compression of the rear shock absorber. After rotation, the center distance between the mid-drive motor and the rear wheel will change, which will cause the chain to become tighter or looser, thus affecting the normal use of the electric motorcycle. Moreover, since the mid-drive motor is directly mounted on the frame, it is necessary to disassemble a large part of the frame structure to remove the mid-drive motor. This makes maintenance or replacement of the mid-drive motor troublesome, thus affecting the efficiency of disassembly and assembly.

[0003] Another method involves installing a swingarm structure on the frame and then mounting the mid-drive motor on the swingarm structure. Compared to the first method, when the electric motorcycle encounters uneven road surfaces and experiences bumps, the mid-drive motor and the rear wheel will rotate synchronously. In this case, there will be no relative displacement between the mid-drive motor and the rear wheel, so the chain will not experience tension changes and will not affect the normal use of the electric motorcycle. Moreover, when the mid-drive motor is mounted on the swingarm structure, it is only necessary to remove the swingarm shaft on the swingarm to remove the mid-drive motor from the electric motorcycle, thereby improving the convenience of disassembling and maintaining the mid-drive motor.

[0004] Although the second type of mid-drive motor installation can solve the two problems caused by the first type of installation, the existing electric motorcycles usually use aluminum alloy flat fork structures in the second type of installation, which leads to a higher manufacturing cost for electric motorcycles. Utility Model Content

[0005] In order to solve the problems in related technologies, this utility model provides a flat fork structure suitable for a mid-mounted motor in an electric motorcycle. This device solves the problem that the existing flat fork structure of electric motorcycles, which usually uses aluminum alloy, results in a high manufacturing cost.

[0006] To solve the above problems, the following technical solutions are provided:

[0007] A swingarm structure suitable for a mid-drive motor in an electric motorcycle includes a swingarm body for mounting the mid-drive motor. The swingarm body is characterized in that it is an iron swingarm body, and a support frame for supporting the swingarm body is fixedly provided at the bottom of the swingarm body. The connection point between the support frame and the swingarm body is the connection point between the swingarm body and the frame of the electric motorcycle.

[0008] Through the above technical solutions, the cost of the iron swingarm body is relatively low, which can reduce the cost of the electric motorcycle. Although the weight of the iron swingarm body is increased by the setting of the support frame, the two ends of the support frame are connected to the swingarm body respectively. The support frame will transfer the force received to the frame, increase the connection points with the frame, and thus ensure the installation stability of the mid-mounted motor. Therefore, the support frame can provide support for the iron swingarm body, thereby ensuring the stability of the electric motorcycle.

[0009] Furthermore, the flat fork body includes a flat fork housing, the mid-mounted motor is disposed inside the flat fork housing, and multiple through holes corresponding to the mounting holes on the mid-mounted motor are provided on the two side walls of the flat fork housing parallel to the width direction of the electric motorcycle. Each through hole contains a bolt, and the flat fork housing is connected to the mid-mounted motor through the bolts.

[0010] With the above technical solution, by setting multiple through holes and bolts, when it is necessary to remove the mid-drive motor from the flat fork body, it is not necessary to disassemble the frame. Only the bolts on the through holes need to be removed. The number of parts to be removed is small, and the disassembly is convenient, thereby improving the convenience of disassembling, maintaining and repairing the mid-drive motor.

[0011] Furthermore, the flat fork body also includes a flat fork shaft and a flat fork connector. The flat fork shaft and the flat fork connector are respectively fixedly disposed on two side walls parallel to the length direction of the electric motorcycle in the flat fork housing. The length of the flat fork shaft is set along the width direction of the electric motorcycle. The end of the flat fork shaft away from the flat fork housing is fixedly connected to the frame of the electric motorcycle. The length of the flat fork connector is set along the length direction of the electric motorcycle. The end of the flat fork connector away from the flat fork housing is fixedly connected to the frame of the electric motorcycle.

[0012] Both ends of the support frame along its length are fixedly connected to the flat fork shaft and the flat fork connector, respectively. The shape of the section of the support frame corresponding to the position of the flat fork housing is consistent with the bottom shape of the flat fork housing, and the flat fork housing fits against the support frame.

[0013] By using the above technical solution, the shape of the support frame corresponding to the position of the fork housing is set to match the bottom shape of the fork housing, so that the bottom surface of the fork housing can be placed exactly on the support frame, increasing the contact area between the fork housing and the support frame, thereby improving the support stability of the mid-drive motor and ensuring the stability of the electric motorcycle.

[0014] Furthermore, the flat fork connector includes a first connecting rod and two second connecting rods with identical structures. The length direction of the first connecting rod is consistent with the length direction of the flat fork shaft, and one end of each of the two second connecting rods is fixedly connected to the first connecting rod in the length direction.

[0015] The support frame includes two identical support rods. One end of each support rod along its length is fixedly connected to the flat fork shaft, and the other end of each support rod along its length is fixedly connected to a second connecting rod. There is a gap between each support rod and the corresponding second connecting rod through which a power transmission chain passes.

[0016] With the above technical solution, by setting up the first connecting rod and two second connecting rods, after the central motor is installed on the flat fork housing, the first connecting rod and the two second connecting rods jointly bear the load, so that the stress is more evenly distributed in all places, thereby reducing structural damage caused by excessive local stress.

[0017] Furthermore, a reinforcing member is provided at the connection point between each of the second connecting rod and the first connecting rod.

[0018] Through the above technical solution, the reinforcement can significantly enhance the load-bearing capacity at the connection between the second connecting rod and the first connecting rod, thereby enhancing the overall stability of the flat fork connector and ensuring the stability of the flat fork body.

[0019] Furthermore, a first notch is provided on the side end of the fork housing near the fork connector. Both ends of the first connecting rod in the length direction and the connection points between the two second connecting rods and the first connecting rod are located within the first notch. Both ends of the first connecting rod in the length direction extend out of the fork housing.

[0020] Through the above technical solution, the first connecting rod and the two second connecting rods can be quickly assembled in a short time by means of snap-fit ​​design, thereby improving assembly efficiency.

[0021] Furthermore, the fork housing includes two identical connecting shells, and the two connecting shells, the fork shaft, and the first connecting rod form a cavity for accommodating the mid-mounted motor.

[0022] The above solution has the following advantages:

[0023] 1. The use of a steel swingarm body reduces the cost of the electric motorcycle. Although the weight of the steel swingarm body is increased by the support frame, the two ends of the support frame are connected to the swingarm body. The support frame will transfer the force to the frame, increasing the connection points with the frame, thereby ensuring the installation stability of the mid-mounted motor. Therefore, the support frame can provide support for the steel swingarm body, thus ensuring the stability of the electric motorcycle.

[0024] 2. With the setting of multiple through holes and bolts, when it is necessary to remove the mid-drive motor from the flat fork body, it is not necessary to disassemble the frame. Only the bolts on the through holes need to be removed. The number of parts to be removed is small, and the disassembly is convenient, thereby improving the convenience of disassembling and maintaining the mid-drive motor.

[0025] 3. By setting the shape of the support frame corresponding to the position of the flat fork housing to be consistent with the bottom shape of the flat fork housing, the bottom surface of the flat fork housing can be placed exactly on the support frame, increasing the contact area between the flat fork housing and the support frame, thereby improving the support stability of the mid-drive motor and ensuring the stability of the electric motorcycle.

[0026] 4. With the first connecting rod and two second connecting rods, after the central motor is installed on the flat fork housing, the first connecting rod and the two second connecting rods share the load, making the stress more evenly distributed in all places, thereby reducing structural damage caused by excessive local stress.

[0027] 5. By adding reinforcing components, the load-bearing capacity at the connection between the second connecting rod and the first connecting rod can be significantly enhanced, thereby improving the overall stability of the flat fork connector and ensuring the stability of the flat fork body.

[0028] 6. Through the snap-fit ​​design, the first connecting rod and the two second connecting rods can be quickly assembled into place in a short time, thereby improving assembly efficiency. Attached Figure Description

[0029] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0030] Figure 1 This is a schematic diagram of a flat fork structure suitable for a mid-mounted motor in an electric motorcycle.

[0031] Figure 2 This is a schematic diagram of the structure of the flat fork body in a flat fork structure suitable for a mid-mounted motor in an electric motorcycle;

[0032] Figure 3 This is a schematic diagram of one of the connecting shells in a flat fork structure suitable for a mid-mounted motor in an electric motorcycle.

[0033] Figure 4 This is a schematic diagram of the support frame in a flat fork structure suitable for a mid-mounted motor in an electric motorcycle.

[0034] Figure 5 This is a schematic diagram of a structure suitable for assembling a mid-drive motor and a chain in a mid-drive electric motorcycle.

[0035] Explanation of reference numerals in the attached drawings: 1. Central motor; 2. Support frame; 3. Flat fork housing; 4. Through hole; 5. Flat fork shaft; 6. Flat fork connector; 601. First connecting rod; 602. Second connecting rod; 7. Reinforcing member; 8. First notch; 9. Second notch. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] In a specific embodiment, such as Figure 1-5 As shown, a flat fork structure suitable for a mid-drive motor of an electric motorcycle includes a flat fork body for mounting the mid-drive motor 1. In this specific embodiment, both ends of the flat fork body in the length direction are fixedly connected to the frame of the electric motorcycle. The flat fork body is an iron flat fork body. A support frame 2 for supporting the flat fork body is fixedly provided at the bottom of the flat fork body, and the connection point between the support frame 2 and the flat fork body is the connection point between the flat fork body and the frame of the electric motorcycle. In this specific embodiment, both ends of the support frame 2 in the length direction are fixedly connected to both ends of the flat fork body in the length direction.

[0038] The cost of the iron flat fork body is relatively low, which can reduce the cost of the electric motorcycle. Although the weight of the flat fork body increases after the iron flat fork body is selected, the two ends of the support frame 2 are connected to the flat fork body respectively. The support frame 2 will transmit the force along the support frame 2 to the frame, increasing the connection points with the frame, thereby ensuring the installation stability of the mid-mounted motor 1. Therefore, the support frame 2 can provide support for the iron flat fork body, thereby ensuring the stability of the electric motorcycle.

[0039] like Figure 2 As shown, the swingarm body includes a swingarm housing 3, and a mid-drive motor 1 is installed inside the swingarm housing 3. Multiple through holes 4 corresponding to the mounting holes on the mid-drive motor 1 are provided on the two side walls of the swingarm housing 3 parallel to the width direction of the electric motorcycle. Each through hole 4 contains a bolt, and the swingarm housing 3 is connected to the mid-drive motor 1 by bolts. When it is necessary to remove the mid-drive motor 1 from the swingarm body, it is not necessary to disassemble the frame. Only the bolts on the through holes 4 need to be removed. The number of disassembled parts is small, and the disassembly is convenient, thereby improving the convenience of disassembling and maintaining the mid-drive motor 1.

[0040] like Figure 2As shown, the swingarm body also includes a swingarm shaft 5 and a swingarm connector 6. The swingarm shaft 5 and the swingarm connector 6 are respectively fixedly installed on the two side walls of the swingarm housing 3 parallel to the length direction of the electric motorcycle. The length of the swingarm shaft 5 is set along the width direction of the electric motorcycle. The end of the swingarm shaft 5 away from the swingarm housing 3 is fixedly connected to the frame of the electric motorcycle. The length of the swingarm connector 6 is set along the length direction of the electric motorcycle. The end of the swingarm connector 6 away from the swingarm housing 3 is fixedly connected to the frame of the electric motorcycle. At this time, the support frame 2 is equivalent to a reinforcing member between the swingarm shaft 5 and the swingarm connector 6.

[0041] like Figure 1 As shown, the two ends of the support frame 2 along its length are fixedly connected to the flat fork shaft 5 and the flat fork connector 6, respectively. The shape of the section of the support frame 2 corresponding to the position of the flat fork housing 3 is consistent with the bottom shape of the flat fork housing 3, and the flat fork housing 3 fits against the support frame 2. Because the shape of the section of the support frame 2 corresponding to the position of the flat fork housing 3 is consistent with the bottom shape of the flat fork housing 3, the bottom surface of the flat fork housing 3 can be placed exactly on the support frame 2, increasing the contact area between the flat fork housing 3 and the support frame 2, thereby improving the support stability of the central motor 1 and ensuring the stability of the electric motorcycle.

[0042] like Figure 3 As shown, the horizontal fork connector 6 includes a first connecting rod 601 and two identical second connecting rods 602. The length direction of the first connecting rod 601 is consistent with the length direction of the horizontal fork shaft 5. One end of each of the two second connecting rods 602 is fixedly connected to the first connecting rod 601 in the length direction. The other end of each of the two second connecting rods 602 is used to connect to the frame on both sides of the rear wheel. It is conventional technology to provide connecting holes on the second connecting rods 602 to connect to the frame on both sides of the rear wheel. It is also existing technology for the second connecting rods 602 to connect to the frame on both sides of the rear wheel. We will not go into details here.

[0043] like Figure 1 and Figure 4 As shown, the support frame 2 includes two identical support rods. One end of each support rod along its length is fixedly connected to the horizontal fork shaft 5, and the other end of each support rod along its length is fixedly connected to a second connecting rod 602. There is a gap between each support rod and the corresponding second connecting rod 602 through which the power supply chain passes. After the central motor 1 is installed on the horizontal fork housing 3, the first connecting rod 601 and the two second connecting rods 602 share the load, making the stress more evenly distributed in all places, thereby reducing structural damage caused by excessive local stress.

[0044] like Figure 1As shown, each connection point between the second connecting rod 602 and the first connecting rod 601 is provided with a reinforcing member 7; the reinforcing member 7 can significantly enhance the load-bearing capacity at the connection point between the second connecting rod 602 and the first connecting rod 601, thereby enhancing the overall stability of the flat fork connector 6 and ensuring the stability of the flat fork body.

[0045] like Figure 1 and Figure 3 As shown, a first notch 8 is provided on the side end of the fork housing 3 near the fork connector 6. Both ends of the first connecting rod 601 in the length direction and the connection points of the two second connecting rods 602 with the first connecting rod 601 are located in the first notch 8. Both ends of the first connecting rod 601 in the length direction extend out of the fork housing 3. Through snap-fit, the first connecting rod 601 and the two second connecting rods 602 can be quickly assembled in a short time, thereby improving assembly efficiency.

[0046] like Figure 1 and Figure 3 As shown, the fork housing 3 includes two identical connecting shells. The two connecting shells are symmetrically arranged along the central axis of the electric motorcycle width direction. Each connecting shell includes a connecting plate and a skirt. The skirt is integrally formed with the corresponding connecting plate. The skirt starts from one end of the top of the connecting plate, extends to the side wall of the connecting plate near the second connecting rod 602, the bottom of the connecting plate, and the side wall of the connecting plate away from the second connecting rod 602, and ends at the other end of the top of the connecting plate. In this specific embodiment, there is a second notch 9 on the connecting plate. The second notch 9 extends upward through the top of the connecting plate. After the mid-drive motor 1 is installed in the fork housing 3, the output shaft of the mid-drive motor 1 is smaller than the second notch 9. The output shaft of the mid-drive motor 1 is located in the second notch 9. The through hole 4 is located on the connecting plate around the second notch 9. A cavity for placing the mid-drive motor 1 is formed between the two connecting shells, the fork shaft 5, and the first connecting rod 601.

[0047] Operation process: Fix the section of the swingarm axle furthest from the swingarm housing onto the electric motorcycle frame. Fix the two connecting shells onto the two support rods respectively, with the top of each connecting shell abutting the top of the corresponding support rod and the sidewall of each connecting shell abutting the curved surface of the swingarm axle. Fix one end of the length direction of the two second connecting rods to one of the corresponding sidewalls in the width direction of the first connecting rod. After connection, snap a reinforcing piece to block the connection at the joint of each first and second connecting rod to complete the assembly of the swingarm connector. Place the swingarm connector in the first notch. At this time, the two ends of the length direction of the first connecting rod are outside the swingarm housing, and the joint of each second connecting rod with the first connecting rod is in the first notch. Fix the section of the second connecting rod furthest from the swingarm housing to the frame on both sides of the rear wheel to complete the assembly of the swingarm body.

[0048] At this point, connect one end of each of the two support rods to the two ends of the horizontal fork shaft along its length, and connect the other end of each of the two support rods to the section of the two second connecting rods furthest from the connecting shell, thus completing the fixation of the support frame;

[0049] The mid-drive motor is placed inside the flat fork housing and secured by multiple bolts passing through the through holes and the corresponding mounting holes on the mid-drive motor.

[0050] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components, and can be direct connections or indirect connections through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0051] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all implementation methods here, and any obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A flat fork structure suitable for a mid-drive electric motor in an electric motorcycle, comprising a flat fork body for mounting the mid-drive motor, characterized in that, The flat fork body is an iron flat fork body, and a support frame for supporting the flat fork body is fixedly installed at the bottom of the flat fork body. The connection point between the support frame and the flat fork body is the connection point between the flat fork body and the frame of the electric motorcycle.

2. The flat fork structure suitable for a mid-mounted motor in an electric motorcycle as described in claim 1, characterized in that, The flat fork body includes a flat fork housing, and the mid-mounted motor is disposed inside the flat fork housing. Multiple through holes corresponding to the mounting holes on the mid-mounted motor are provided on the two side walls of the flat fork housing parallel to the width direction of the electric motorcycle. Each through hole contains a bolt, and the flat fork housing is connected to the mid-mounted motor through the bolts.

3. The flat fork structure suitable for a mid-mounted motor in an electric motorcycle as described in claim 2, characterized in that, The flat fork body also includes a flat fork shaft and a flat fork connector. The flat fork shaft and the flat fork connector are respectively fixedly installed on the two side walls of the flat fork housing parallel to the length direction of the electric motorcycle. The length of the flat fork shaft is set along the width direction of the electric motorcycle. The end of the flat fork shaft away from the flat fork housing is fixedly connected to the frame of the electric motorcycle. The length of the flat fork connector is set along the length direction of the electric motorcycle. The end of the flat fork connector away from the flat fork housing is fixedly connected to the frame of the electric motorcycle. Both ends of the support frame along its length are fixedly connected to the flat fork shaft and the flat fork connector, respectively. The shape of the section of the support frame corresponding to the position of the flat fork housing is consistent with the bottom shape of the flat fork housing, and the flat fork housing fits against the support frame.

4. A flat fork structure suitable for a mid-mounted motor in an electric motorcycle as described in claim 3, characterized in that, The flat fork connector includes a first connecting rod and two second connecting rods with the same structure. The length direction of the first connecting rod is the same as the length direction of the flat fork shaft. One end of the length direction of each of the two second connecting rods is fixedly set to the first connecting rod. The support frame includes two identical support rods. One end of each support rod along its length is fixedly connected to the flat fork shaft, and the other end of each support rod along its length is fixedly connected to a second connecting rod. There is a gap between each support rod and the corresponding second connecting rod through which a power transmission chain passes.

5. A flat fork structure suitable for a mid-mounted motor in an electric motorcycle as described in claim 4, characterized in that, Each of the second connecting rods is provided with a reinforcing member at the connection point between it and the first connecting rod.

6. A flat fork structure suitable for a mid-mounted motor in an electric motorcycle as described in claim 4, characterized in that, A first notch is provided on the side end of the fork housing near the fork connector. Both ends of the first connecting rod in the length direction and the connection points between the two second connecting rods and the first connecting rod are located within the first notch. Both ends of the first connecting rod in the length direction extend out of the fork housing.

7. A flat fork structure suitable for a mid-mounted motor in an electric motorcycle as described in claim 4, characterized in that, The fork housing includes two identical connecting shells, and a cavity for placing the mid-mounted motor is formed between the two connecting shells, the fork shaft, and the first connecting rod.

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