A cradle type steel pipe frame for an electric motorcycle

Abstract

The utility model provides a kind of cradle type steel pipe frame for electric motorcycle belongs to motorcycle frame technical field, it solves the uneven stress distribution of the overall structure of existing motorcycle frame, leading to vehicle safety and stability are poor, power assembly protection measures are not perfect, power assembly is vulnerable to damage when subjected to external force impact and other technical problems. Including main frame assembly, cradle assembly, sub-frame assembly and containing box frame, cradle assembly is located below main frame assembly, sub-frame assembly is located behind main frame assembly and cradle assembly, cradle assembly upper end is set in the lower end of main frame assembly, the front end of sub-frame assembly is fixed in the rear end of main frame assembly, the lower end of sub-frame assembly is fixed in the rear end of cradle assembly, containing box frame is fixed in the upper end of sub-frame assembly. The utility model whole stress distribution is reasonable, stability and safety are high, can effectively protect power assembly, can be well completed to the support of vehicle, and excellent performance.

Description

Technical Field

[0001] This utility model belongs to the field of motorcycle frame technology, and relates to a cradle-type steel tube frame for electric motorcycles. Background Technology

[0002] The frame is a crucial safety component of a motorcycle, serving to bear weight, provide impact protection, and support and secure most of the motorcycle's accessories. Therefore, motorcycle frames require high rigidity and strength to ensure the motorcycle's safety and stability. Traditional motorcycles primarily use internal combustion engines for power, which offer good performance. However, with rapid technological advancements and to reduce environmental pollution, electric motorcycles have become the mainstream. In electric motorcycles, traditional frames often suffer from uneven stress distribution, leading to compromised safety and stability. Furthermore, inadequate protection for the power components makes them vulnerable to damage from external impacts.

[0003] Therefore, we propose a cradle-type steel tube frame for electric motorcycles, which has a reasonable overall stress distribution, high stability and safety, can effectively protect the power components, can provide good support for the vehicle, and has excellent performance. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a cradle-type steel tube frame for electric motorcycles. The technical problem this utility model aims to solve is: how to achieve a reasonable overall stress distribution, high stability and safety, effective protection of the power components, and excellent support for the vehicle, resulting in superior performance.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A cradle-type steel tube frame for an electric motorcycle includes a main frame assembly, a cradle assembly, a subframe assembly, and a housing frame. The cradle assembly is located below the main frame assembly, and the subframe assembly is located behind the main frame assembly and the cradle assembly. The upper end of the cradle assembly is located at the lower end of the main frame assembly. The front end of the subframe assembly is fixed to the rear end of the main frame assembly, and the lower end of the subframe assembly is fixed to the rear end of the cradle assembly. The housing frame is fixed to the upper end of the subframe assembly.

[0007] The working principle of this utility model is as follows: the main frame assembly serves as the core support structure, responsible for installing the vehicle's steering components and supporting the entire vehicle. The cradle assembly is located below the main frame assembly, and its interior is used to install the vehicle's power components. Through its structure, it protects the power components, preventing external forces from damaging them. The subframe assembly is used to install the vehicle's seat and other related components, providing support for the rider and ensuring comfort and stability during riding. The storage box frame is used to install the storage box, which can be used to place related items or working parts, serving a storage and operation function. The entire frame, through the cooperation of the main frame assembly, cradle assembly, subframe assembly, and storage box frame, each undertakes different functions, forming a complete structure with high overall strength, reasonable stress distribution, and strong protection for the power components, effectively ensuring the normal operation of the vehicle.

[0008] The main frame assembly includes a riser, a main beam, a support beam, and a support tube. The upper end of the riser is inclined backward, and the rear ends of the main beam and the support tube are inclined downward. The main beam and the support tube are located directly behind the riser, and the support tube is located directly below the main beam. The front ends of the main beam and the support tube are fixed to the side wall of the riser. The front and rear ends of the support beam are fixed to the support tube and the main beam, respectively. A limit block is fixed to the front end of the riser. A positioning pin is fixed to the upper end of the middle part of the main beam. Two symmetrical reinforcing plates are fixed between the riser, the main beam, and the support tube. A three-pronged connector is fixed to the rear end of the main beam.

[0009] With the above structure, the main frame assembly achieves stable support and functional adaptation through the structure and connection of each component. The upper end of the riser is tilted backward to accommodate the installation of the steering component. The riser, main beam, support tube and support beam are interconnected and support each other to enhance the strength of the main frame assembly. The limit block plays a steering limiting role. The positioning pin on the main beam is used for component installation positioning. Two left and right symmetrical reinforcing plates further improve the overall structural rigidity. The three-way connector is used to connect with other frame components. All components work together to form the support and connection foundation of the main frame assembly.

[0010] The cradle assembly includes a bottom crossbeam, an upper crossbeam, a lower crossbeam, two symmetrically arranged front cradle bends, and two symmetrically arranged rear cradle bends. The bottom crossbeam is horizontally arranged in the left-right direction and is located below the main frame assembly. The two front cradle bends are located on the left and right sides of the main frame assembly, respectively. The upper ends of the two front cradle bends are bent toward the main frame assembly and are fixedly connected to the lower ends of the support tubes on both sides. The lower ends of the two front cradle bends are bent backward and are fixedly connected to the front end of the bottom crossbeam. The two rear cradle bends are located on the left and right sides of the main frame assembly, respectively. The upper ends of the two rear cradle bends are bent toward the main frame assembly and are fixedly connected to the rear ends of the main beam on both sides. The lower ends of the two rear cradle bends are bent forward and are fixedly connected to the rear end of the bottom crossbeam. The upper crossbeam is horizontally arranged in the left-right direction between the bent portions at the upper ends of the two rear cradle bends, and the lower crossbeam is horizontally arranged in the left-right direction between the bent portions at the lower ends of the two rear cradle bends.

[0011] With the above structure, the cradle assembly forms a wrap-around support and protection for the power assembly through the structural design and connection of each component. The bottom crossbeam serves as the bottom foundation support, and the connection between the front and rear cradle bends and the bottom crossbeam forms a frame structure surrounding the power assembly, which is connected to the main frame assembly. The upper and lower crossbeams are horizontally set between the two rear cradle bends, further enhancing the overall structural strength and stability of the cradle assembly, and together achieving stable support and effective protection for the power assembly.

[0012] The upper end of the bottom crossbeam is fixed with a power component mounting seat one. Both ends of the bottom crossbeam are fixed with foot pedal mounting seats. The lower bends of the two rear cradle tubes are fixed with rear horizontal fork mounting seats. The front end of the upper crossbeam is fixed with two symmetrical power component mounting seats two. The front end of the lower crossbeam is fixed with two symmetrical power component mounting seats three. The rear end of the lower crossbeam is fixed with a sprocket mounting seat. The sprocket mounting seat is located on the right side of the main frame assembly. The lower bend of the rear cradle tube on the left side is fixed with a brake component mounting seat. The lower bend of the rear cradle tube on the right side is fixed with a side support mounting seat.

[0013] With the above structure, the power component mounting bracket one is used for bottom mounting and fixing of the power component; the foot pedal mounting bracket is used for mounting the foot pedals to facilitate the rider's foot placement; the rear swingarm mounting bracket is used to connect the rear swingarm and the rear wheel assembly; the power component mounting bracket two and three further enhance the stability of the power component installation; the sprocket mounting bracket is used to install the sprocket to realize power transmission; the brake component mounting bracket is used for mounting the brake components to realize the vehicle braking function; and the side stand mounting bracket is used to install the side stand to facilitate vehicle parking. All components work together to ensure reliable connection and functional realization of the cradle assembly and related components.

[0014] The subframe assembly includes a rear crossbeam, connector two, a support rod, two symmetrically arranged side beams, and two symmetrically arranged diagonal braces. The front and rear ends of the two side beams are bent towards the middle. The front ends of the two side beams are fixed to the three-way connector. The housing frame is fixed between the middle parts of the two side beams. The rear crossbeam is horizontally arranged between the rear ends of the two side beams in the left-right direction. The rear ends of the two diagonal braces are inclined upwards. The front ends of the two diagonal braces are respectively fixed to the middle parts of the two rear cradle bends. The rear ends of the two diagonal braces are respectively fixed to the rear ends of the two side beams. Connector one is fixed to the front end of each of the two diagonal braces. Connector one is located on the side of the diagonal brace away from the housing frame on the same side. Connector two and the support rod are both fixed to the front ends of the two side beams. The support rod is located behind connector two. Reinforcing blocks are fixed between the rear ends of the two side beams and the diagonal braces on the same side. A seat lock mounting base is fixed on the diagonal brace on the left side.

[0015] With the above structure, the subframe assembly forms a stable structure through the connection and cooperation of various components, and supports and installs related components. The two side beams are used to connect with the main frame assembly and bear the load of the housing frame and vehicle seat. The rear crossbeam is set between the two side beams to enhance the stability of the rear structure. The front ends of the two diagonal braces are connected to the cradle assembly, and the rear ends are fixed to the side beams to strengthen the connection between the subframe assembly and the cradle assembly and improve the overall support strength. Two connectors are used to connect and fix related components. Connector 2 and the support rod together help to enhance the front connection strength of the subframe assembly. Two reinforcing blocks further improve the local structural rigidity. The seat lock mounting bracket is used to install the seat lock to realize the locking function of the seat. All components work together to form the support and installation foundation of the subframe assembly.

[0016] Compared with existing technologies, the cradle-type steel tube frame of this electric motorcycle has the following advantages:

[0017] 1. The main frame assembly, cradle assembly and subframe assembly work together to form a complete whole, which makes the overall stress distribution reasonable and can withstand various stresses and loads during driving, with good safety and high stability.

[0018] 2. By setting up a cradle assembly, the cradle assembly encloses the power assembly. Through the surrounding structure, it can effectively resist external impacts, provide physical protection for the power assembly, and reduce vibration transmission.

[0019] 3. The subframe assembly works in conjunction with the storage box frame, which provides convenient storage space and stable support for the rider. The overall structural design takes into account both the reliability of vehicle operation and the riding experience, making it suitable for a variety of usage scenarios. Attached Figure Description

[0020] Figure 1This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a schematic diagram of the right-side planar structure of this utility model.

[0022] Figure 3 This is a structural schematic diagram of the front frame assembly in this utility model.

[0023] Figure 4 This is a structural schematic diagram of the front cradle bend and bottom crossbeam in this utility model.

[0024] Figure 5 This is a structural schematic diagram of some components of the cradle assembly in this utility model.

[0025] Figure 6 This is a structural schematic diagram of the rear frame assembly in this utility model.

[0026] In the diagram, 1. Main frame assembly; 2. Cradle assembly; 3. Subframe assembly; 4. Housing frame; 5. Steerable tube; 6. Main beam; 7. Support beam; 8. Support tube; 9. Limiting block; 10. Reinforcing plate; 11. Positioning pin; 12. Front cradle bend; 13. Bottom crossbeam; 14. Power assembly mounting seat one; 15. Foot pedal mounting seat; 16. Three-way connector; 17. Rear cradle bend; 18. Rear swingarm mounting seat; 19. Upper crossbeam; 20. Power assembly mounting seat two; 21. Lower crossbeam; 22. Power assembly mounting seat three; 23. Sprocket mounting seat; 24. Brake assembly mounting seat; 25. Side brace mounting seat; 26. Side beam; 27. Rear crossbeam; 28. Diagonal brace tube; 29. ​​Connector one; 30. Connector two; 31. Support rod; 32. Reinforcing block; 33. Seat lock mounting seat. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] like Figures 1-6 As shown, the cradle-type steel tube frame for this electric motorcycle includes a main frame assembly 1, a cradle assembly 2, a sub-frame assembly 3, and a housing frame 4. The cradle assembly 2 is located below the main frame assembly 1, and the sub-frame assembly 3 is located behind the main frame assembly 1 and the cradle assembly 2. The upper end of the cradle assembly 2 is located at the lower end of the main frame assembly 1. The front end of the sub-frame assembly 3 is fixed to the rear end of the main frame assembly 1, and the lower end of the sub-frame assembly 3 is fixed to the rear end of the cradle assembly 2. The housing frame 4 is fixed to the upper end of the sub-frame assembly 3.

[0029] In this embodiment, the main frame assembly 1 serves as the core support structure, responsible for installing the vehicle's steering components and supporting the entire vehicle. The cradle assembly 2 is located below the main frame assembly 1, and its interior is used to install the vehicle's power components. Its structure protects the power components from external damage. The subframe assembly 3 is used to install the vehicle seat and other related components, providing support for the rider and ensuring comfort and stability during riding. The storage box frame 4 is used to install the storage box, which can be used to place related items or working parts, serving a storage and operation function. The entire frame, through the cooperation of the main frame assembly 1, cradle assembly 2, subframe assembly 3, and storage box frame 4, each undertakes different functions, forming a complete structure with high overall strength, reasonable stress distribution, and strong protection for the power components, thus ensuring the normal operation of the vehicle.

[0030] The main frame assembly 1 includes a riser 5, a main beam 6, a support beam 7, and a support tube 8. The upper end of the riser 5 is inclined backward, and the rear ends of the main beam 6 and the support tube 8 are both inclined downward. The main beam 6 and the support tube 8 are located directly behind the riser 5, and the support tube 8 is located directly below the main beam 6. The front ends of the main beam 6 and the support tube 8 are fixed to the side wall of the riser 5. The front and rear ends of the support beam 7 are fixed to the support tube 8 and the main beam 6, respectively. A limit block 9 is fixed to the front end of the riser 5. A positioning pin 11 is fixed to the upper end of the middle part of the main beam 6. Two left-right symmetrical reinforcing plates 10 are fixed between the riser 5, the main beam 6, and the support tube 8. A three-way connector 16 is fixed to the rear end of the main beam 6.

[0031] In this embodiment, the main frame assembly 1 achieves stable support and functional adaptation through the structure and connection of each component. The upper end of the riser 5 is tilted backward to adapt to the installation of the steering component. The riser 5, main beam 6, support tube 8 and support beam 7 are interconnected and support each other to enhance the strength of the main frame assembly 1. The limiting block 9 plays a steering limiting role. The positioning pin 11 on the main beam 6 is used for component installation positioning. The two left and right symmetrical reinforcing plates 10 further improve the overall structural rigidity. The three-way connector 16 is used to connect with other frame components. All components work together to form the support and connection foundation of the main frame assembly 1.

[0032] The cradle assembly 2 includes a bottom crossbeam 13, an upper crossbeam 19, a lower crossbeam 21, two symmetrically arranged front cradle bends 12, and two symmetrically arranged rear cradle bends 17. The bottom crossbeam 13 is horizontally arranged in the left-right direction and is located below the main frame assembly 1. The two front cradle bends 12 are located on the left and right sides of the main frame assembly 1, respectively. The upper ends of the two front cradle bends 12 towards the main frame assembly 1 and are fixedly connected to the lower ends of the support tubes 8 on both sides. The lower ends of the two front cradle bends 12 backward and are fixedly connected to the support tubes 8. The two rear cradle bends 17 are located on the left and right sides of the main frame assembly 1, respectively. The upper ends of the two rear cradle bends 17 are bent toward the main frame assembly 1 and fixedly connected to the two sides of the rear end of the main beam 6. The lower ends of the two rear cradle bends 17 are bent forward and fixedly connected to the rear end of the bottom crossbeam 13. The upper crossbeam 19 is horizontally arranged in the left and right direction between the bent portions of the upper ends of the two rear cradle bends 17. The lower crossbeam 21 is horizontally arranged in the left and right direction between the bent portions of the lower ends of the two rear cradle bends 17.

[0033] In this embodiment, the cradle assembly 2 forms a wrap-around support and protection for the power assembly through the structural design and connection of each component. The bottom crossbeam 13 serves as the bottom foundation support. The front cradle bend 12 and the rear cradle bend 17 are connected to the bottom crossbeam 13 to form a frame structure surrounding the power assembly and are connected to the main frame assembly 1. The upper crossbeam 19 and the lower crossbeam 21 are horizontally arranged between the two rear cradle bends 17, further enhancing the overall structural strength and stability of the cradle assembly 2, and together achieving stable support and effective protection for the power assembly.

[0034] A power component mounting seat 14 is fixed to the upper end of the bottom crossbeam 13. Foot pedal mounting seats 15 are fixed to both ends of the bottom crossbeam 13. Rear horizontal fork mounting seats 18 are fixed to the bent portions at the lower ends of the two rear cradle bends 17. Two symmetrical power component mounting seats 20 are fixed to the front end of the upper crossbeam 19. Two symmetrical power component mounting seats 22 are fixed to the front end of the lower crossbeam 21. A sprocket mounting seat 23 is fixed to the rear end of the lower crossbeam 21. The sprocket mounting seat 23 is located on the right side of the main frame assembly 1. A brake component mounting seat 24 is fixed to the bent portion at the lower end of the rear cradle bend 17 on the left side. A side support mounting seat 25 is fixed to the bent portion at the lower end of the rear cradle bend 17 on the right side.

[0035] In this embodiment, the power component mounting base 14 is used for the bottom mounting and fixing of the power component, the foot pedal mounting base 15 is used for mounting the foot pedal to facilitate the rider's foot placement, the rear swingarm mounting base 18 is used to connect the rear swingarm and the rear wheel assembly, the power component mounting base 20 and the power component mounting base 3 22 further enhance the stability of the power component mounting, the sprocket mounting base 23 is used to mount the sprocket to realize power transmission, the brake component mounting base 24 is used for mounting the brake component to realize the vehicle braking function, and the side stand mounting base 25 is used to mount the side stand to facilitate vehicle parking. All components work together to ensure reliable connection and functional realization of the cradle assembly 2 and related components.

[0036] The subframe assembly 3 includes a rear crossbeam 27, a connector 30, a support rod 31, two side beams 26 arranged symmetrically on the left and right, and two diagonal bracing tubes 28 arranged symmetrically on the left and right. The front and rear ends of the two side beams 26 are bent towards the middle position. The front ends of the two side beams 26 are fixed to the three-way connector 16. The housing frame 4 is fixed between the middle parts of the two side beams 26. The rear crossbeam 27 is horizontally arranged between the rear ends of the two side beams 26 in the left and right direction. The rear ends of the two diagonal bracing tubes 28 are inclined upwards. The front ends of the two diagonal bracing tubes 28 are respectively fixed to the two rear swingarms. On the middle part of the basket bend tube 17, the rear ends of the two diagonal bracing tubes 28 are respectively fixed to the rear ends of the two side beams 26. The front ends of the two diagonal bracing tubes 28 are each fixed with a connector 29. The two connectors 29 are respectively located on the side of the diagonal bracing tube 28 on the same side away from the receiving box frame 4. The connector 30 and the support rod 31 are both fixed to the front ends of the two side beams 26. The support rod 31 is located behind the connector 30. The rear ends of the two side beams 26 and the diagonal bracing tubes 28 on the same side are each fixed with a reinforcing block 32. The seat lock mounting base 33 is fixed on the diagonal bracing tube 28 on the left side.

[0037] In this embodiment, the subframe assembly 3 forms a stable structure through the connection and cooperation of various components, and supports and installs related components. Two side beams 26 are used to connect with the main frame assembly 1 and bear the housing frame 4 and the vehicle seat cushion. The rear crossbeam 27 is set between the two side beams 26 to enhance the stability of the rear structure. The front ends of the two diagonal bracing tubes 28 are connected to the cradle assembly 2, and the rear ends are fixed to the side beams 26 to strengthen the connection between the subframe assembly 3 and the cradle assembly 2 and improve the overall support strength. Two connectors 1 29 are used for connecting and fixing related components. Connector 2 30 and support rod 31 jointly help to enhance the front connection strength of the subframe assembly 3. Two reinforcing blocks 32 further improve the local structural rigidity. The seat cushion lock mounting base 33 is used to install the seat cushion lock to realize the locking function of the seat cushion. All components work together to form the support and installation foundation of the subframe assembly 3.

[0038] The working principle of this utility model: The cradle-type steel tube frame for this electric motorcycle consists of a main frame assembly 1, a cradle assembly 2, a sub-frame assembly 3, and a housing frame 4. The main frame assembly 1 serves as the core support structure, forming a stable frame through interconnection of the upright tube 5, main beam 6, support beam 7, and support tube 8. The upper end of the upright tube 5 is tilted backward to accommodate the installation of the steering assembly. The limiting block 9 restricts the steering angle, the positioning pin 11 is used for component positioning, the reinforcing plate 10 increases rigidity, and the three-way connector 16 connects to the sub-frame assembly 3. The cradle assembly 2 is located below the main frame assembly 1. The front cradle bend tube 12 and the rear cradle bend tube 17 are connected to form a wrap-around frame through the bottom crossbeam 13, upper crossbeam 19, and lower crossbeam 21. The power assembly mounting seat 14 and the power unit are also included. Mounting bracket 20 and power component mounting bracket 3 22 securely mount the power component. Foot pedal mounting bracket 15, rear horizontal fork mounting bracket 18, sprocket mounting bracket 23, brake component mounting bracket 24, and side support mounting bracket 25 respectively realize the functions of their corresponding components. The subframe assembly 3 is fixed to the three-way connector 16 through the front end of the side beam 26. The diagonal brace tube 28 connects to the rear cradle bend tube 17 to enhance stability. The rear crossbeam 27, connector 2 30, support rod 31, and reinforcing block 32 improve structural strength. The seat lock mounting bracket 33 is used to lock the seat. The middle part of the side beam 26 supports and accommodates the box frame 4. All components work together through the above structure and connection method, with high overall strength and reasonable stress distribution, effectively protecting the power component and ensuring the normal operation of the vehicle.

[0039] In summary, the main frame assembly 1, cradle assembly 2 and subframe assembly 3 work together to form a complete whole, which makes the overall stress distribution reasonable, can withstand various stresses and loads during driving, and has good safety and high stability.

[0040] By setting up cradle assembly 2, which encloses the power assembly, the surrounding structure can effectively resist external impacts, provide physical protection for the power assembly, and reduce vibration transmission.

[0041] The subframe assembly 3 works in conjunction with the storage box frame 4, which provides convenient storage space and stable support for the rider. The overall structural design takes into account both the reliability of vehicle operation and the riding experience, making it suitable for a variety of usage scenarios.

[0042] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A cradle-type steel tube frame for an electric motorcycle, comprising a main frame assembly (1), a cradle assembly (2), a subframe assembly (3), and a housing frame (4), characterized in that, The cradle assembly (2) is located below the main frame assembly (1), and the subframe assembly (3) is located behind the main frame assembly (1) and the cradle assembly (2). The upper end of the cradle assembly (2) is located at the lower end of the main frame assembly (1), the front end of the subframe assembly (3) is fixed to the rear end of the main frame assembly (1), the lower end of the subframe assembly (3) is fixed to the rear end of the cradle assembly (2), and the housing frame (4) is fixed to the upper end of the subframe assembly (3).

2. The cradle-type steel tube frame for an electric motorcycle according to claim 1, characterized in that, The main frame assembly (1) includes a riser (5), a main beam (6), a support beam (7), and a support tube (8). The upper end of the riser (5) is inclined backward. The rear ends of the main beam (6) and the support tube (8) are both inclined downward. The main beam (6) and the support tube (8) are located directly behind the riser (5). The support tube (8) is located directly below the main beam (6). The front ends of the main beam (6) and the support tube (8) are fixed to the side wall of the riser (5). The front and rear ends of the support beam (7) are fixed to the support tube (8) and the main beam (6), respectively. The front end of the riser (5) is fixed with a limit block (9). The upper end of the middle part of the main beam (6) is fixed with a positioning pin (11). Two left-right symmetrical reinforcing plates (10) are fixed between the riser (5), the main beam (6), and the support tube (8). The rear end of the main beam (6) is fixed with a three-way connector (16).

3. A cradle-type steel tube frame for an electric motorcycle according to claim 2, characterized in that, The cradle assembly (2) includes a bottom crossbeam (13), an upper crossbeam (19), a lower crossbeam (21), two symmetrically arranged front cradle bends (12) and two symmetrically arranged rear cradle bends (17). The bottom crossbeam (13) is horizontally arranged in the left-right direction and is located below the main frame assembly (1). The two front cradle bends (12) are located on the left and right sides of the main frame assembly (1), respectively. The upper ends of the two front cradle bends (12) are bent toward the main frame assembly (1) and fixedly connected to the two sides of the lower end of the support tube (8), respectively. The lower ends of the two front cradle bends (12) are rearward. The two rear cradle bends (17) are bent and fixedly connected to the front end of the bottom crossbeam (13). The two rear cradle bends (17) are located on the left and right sides of the main frame assembly (1). The upper ends of the two rear cradle bends (17) towards the main frame assembly (1) and are fixedly connected to the two sides of the rear end of the main beam (6). The lower ends of the two rear cradle bends (17) are bent forward and fixedly connected to the rear end of the bottom crossbeam (13). The upper crossbeam (19) is horizontally set between the bent portions of the upper ends of the two rear cradle bends (17) in the left and right direction. The lower crossbeam (21) is horizontally set between the bent portions of the lower ends of the two rear cradle bends (17) in the left and right direction.

4. A cradle-type steel tube frame for an electric motorcycle according to claim 3, characterized in that, The upper end of the bottom crossbeam (13) is fixed with a power component mounting seat one (14), and the left and right ends of the bottom crossbeam (13) are both fixed with foot pedal mounting seats (15). The bent portions of the lower ends of the two rear cradle tubes (17) are both fixed with rear horizontal fork mounting seats (18). The front end of the upper crossbeam (19) is fixed with two left and right symmetrical power component mounting seats two (20), the front end of the lower crossbeam (21) is fixed with two left and right symmetrical power component mounting seats three (22), the rear end of the lower crossbeam (21) is fixed with a sprocket mounting seat (23), the sprocket mounting seat (23) is located on the right side of the main frame assembly (1), the bent portion of the lower end of the rear cradle tube (17) located on the left side is fixed with a brake component mounting seat (24), and the bent portion of the lower end of the rear cradle tube (17) located on the right side is fixed with a side support mounting seat (25).

5. A cradle-type steel tube frame for an electric motorcycle according to claim 4, characterized in that, The subframe assembly (3) includes a rear crossbeam (27), a connector (30), a support rod (31), two side beams (26) arranged symmetrically on the left and right, and two diagonal bracing tubes (28) arranged symmetrically on the left and right. The front and rear ends of the two side beams (26) are bent towards the middle position. The front ends of the two side beams (26) are fixed to the three-way connector (16). The housing frame (4) is fixed between the middle parts of the two side beams (26). The rear crossbeam (27) is horizontally arranged between the rear ends of the two side beams (26) in the left and right direction. The rear ends of the two diagonal bracing tubes (28) are inclined upwards. The front ends of the two diagonal bracing tubes (28) are respectively fixed to the two rear cradle bends. In the middle part of the tube (17), the rear ends of the two diagonal bracing tubes (28) are fixed to the rear ends of the two side beams (26), and the front ends of the two diagonal bracing tubes (28) are fixed with connector one (29). The two connector one (29) are located on the side of the diagonal bracing tube (28) away from the receiving box frame (4) on the same side. Connector two (30) and support rod (31) are fixed to the front ends of the two side beams (26). Support rod (31) is located behind connector two (30). Reinforcing blocks (32) are fixed between the rear ends of the two side beams (26) and the diagonal bracing tubes (28) on the same side. A seat lock mounting base (33) is fixed on the diagonal bracing tube (28) on the left side.

Images