Lightweight wheelchair with independent suspension structure

Abstract

Lightweight wheelchair with independent suspension structure, characterized in that it comprises a chassis structure and a seat frame structure, wherein the seat frame structure is provided on the chassis structure; a drive unit arranged on the chassis structure; a wheel assembly arranged on the chassis structure, wherein the wheel assembly is arranged on a side of the chassis structure facing away from the seat frame structure; Shock absorber springs (9) arranged on the chassis structure, wherein the shock absorber springs (9) are arranged between the chassis structure and the seat frame structure; and an upper control unit (25) arranged on the seat frame structure, wherein the upper control unit (25) is wirelessly connected to the drive unit.

Description

Technical field

[0001] The present utility model belongs to the technical field of wheelchairs and relates in particular to a lightweight wheelchair with an independent suspension structure. State of the art

[0002] Currently, most lightweight wheelchairs on the market are primarily designed for easy folding, carrying, and storage, emphasizing portability and low weight. However, comfort is difficult to guarantee during extended use or when traveling on uneven surfaces. Due to the lack of an effective damping mechanism, the user experiences significant rocking and vibration on bumpy terrain, making the seating experience tiring and uncomfortable. This not only compromises seating comfort but can also have adverse effects on physical health.

[0003] Although some wheelchairs on the market are equipped with a front-wheel suspension system designed to dampen certain vibrations and improve driving stability, the overall damping performance remains insufficient to meet comfort requirements during extended use. Prolonged journeys on bumpy surfaces lead to user fatigue, compromising the comfort and safety of daily mobility. Therefore, a lightweight wheelchair with an independent suspension system is proposed. Content of the present utility model

[0004] In view of the shortcomings of the prior art, the present utility model provides a lightweight wheelchair with an independent suspension structure, thereby solving the aforementioned problems.

[0005] To achieve the aforementioned purpose, the following technical solution is provided: A lightweight wheelchair with an independent suspension structure, comprising a chassis structure and a seat frame structure, wherein the seat frame structure is provided on the chassis structure; a drive unit arranged on the chassis structure; a wheel assembly arranged on the chassis structure, wherein the wheel assembly is arranged on a side of the chassis structure facing away from the seat frame structure; Shock absorber springs arranged on the chassis structure, wherein the shock absorber springs are arranged between the chassis structure and the seat frame structure; and an upper control unit arranged on the seat frame structure, wherein the upper control unit is wirelessly connected to the drive unit.

[0006] Preferably, the chassis structure comprises a front frame assembly, a left rear frame member, and a right rear frame member, wherein the left rear frame member and the right rear frame member are each connected by means of a screw and nut connection at the central positions of the two side edges of the front frame assembly, wherein one end of the left rear frame member and one end of the right rear frame member are each connected to the front frame assembly, wherein one end of the shock absorber springs is fixedly connected to the two side edges of the front frame assembly, and wherein the other end of the shock absorber springs is fixedly connected to the left rear frame member and the right rear frame member, respectively.

[0007] Preferably, a hinged seat is arranged at the front end of the front frame assembly, with a footrest assembly attached to the hinged seat.

[0008] Preferably, the seat frame structure comprises a seat frame, a lower backrest, and an upper backrest, wherein the lower backrest is attached to the rear ends of the two side edges of the seat frame by means of a screw and nut connection, wherein one lower end of the lower backrest is fixedly connected to the seat frame, and wherein the upper backrest is connected to the other end of the two side edges of the lower backrest, wherein a seat cushion is arranged on one side of the seat frame that is connected to the lower backrest, and wherein a back cushion is arranged on one side of the upper backrest that is connected to the lower backrest.

[0009] Preferably, support rods are rigidly connected to the two side edges of the front frame assembly, wherein one end of each support rod is rigidly connected to the front frame assembly and the other end of the support rod is rigidly connected to the two side edges of the seat frame, wherein the seat frame is arranged above the front frame assembly, and wherein a lower end of the lower backrest is connected to a central position of the shock absorber springs, wherein backrest adjustment rods are rigidly connected to the upper ends of the two side edges of the lower backrest, and wherein the other ends of the backrest adjustment rods are rigidly connected to the upper backrest.

[0010] Preferably, a left armrest and a right armrest are fixedly attached to the side of the two side edges of the seat frame that is provided with the seat cushion, wherein the sides of the left armrest and the right armrest opposite the two side edges of the upper backrest are each fixedly connected to the two side edges of the upper backrest, and wherein the upper control unit is attached to an end of the right armrest facing away from the upper backrest.

[0011] Preferably, the drive unit comprises a battery box, a lower control unit, a left motor and a right motor, wherein the battery box is mounted on a cross member at a central position of the front frame assembly, wherein the lower control unit is attached to the battery box, wherein the left motor is attached to an end of the left rear frame rod facing away from the front frame assembly by means of a screw and nut connection, and wherein the right motor is attached to an end of the right rear frame rod facing away from the front frame assembly by means of a screw and nut connection.

[0012] Preferably, the wheel assembly comprises a left front wheel assembly, a right front wheel assembly and rear wheels, wherein the left front wheel assembly and the right front wheel assembly are each attached to the front ends of the two side edges of the front frame assembly by means of a screw and nut connection, wherein a pivot axis of the rear wheel is connected to an output shaft of the left motor, and wherein a pivot axis of another rear wheel is connected to an output shaft of the right motor.

[0013] Preferably, a left tilt protection bar is attached to a side of the left engine facing the right engine, and a right tilt protection bar is attached to a side of the right engine facing the left engine.

[0014] Preferably, mudguards are arranged above the rear wheels, wherein a mudguard mounting plate is firmly connected to the ends of the left rear frame tube and the right rear frame tube that are associated with the rear wheels, wherein another end of the mudguard mounting plate is firmly connected to the respective mudguard, wherein a mudguard mounting tab is firmly connected to the sides of the left and right engines that are opposite the rear wheels, and wherein another end of the mudguard mounting tab is firmly connected to the respective mudguard.

[0015] In comparison to the prior art, the present utility model provides a lightweight wheelchair with an independent suspension structure, which has the following advantageous effects: The lightweight wheelchair with independent suspension is characterized by the addition of an independent suspension system to a conventional wheelchair, giving each of its four wheels independent suspension. The key advantage lies in its excellent vibration and shock absorption capabilities. Whether encountering uneven road surfaces, small obstacles, or potholes, the independent suspension effectively buffers and dissipates impact energy, significantly reducing the vibration amplitude transmitted to the seat and thus greatly improving comfort. Furthermore, the independent suspension system not only absorbs vertical shocks but also effectively neutralizes horizontal vibrations, ensuring broad applicability and significantly expanding the user base. Brief description of the characters Fig. Figure 1 shows a schematic structural representation of the present utility model; Fig. Figure 2 shows an exploded view of the structure of the present utility model; Fig. Figure 3 shows a partially enlarged view of area A in Fig. 2. Reference symbol list 1 Footrest assembly; 2 left front wheel assembly; 3 right front wheel assembly; 4 front frame assembly; 5 Battery box; 6 lower control unit; 7 left rear frame bar; 8 right rear frame bar; 9 shock absorber springs; 10 mudguard mounting plates; 11 left engine; 12 right engine; 13 Mudguard mounting tab; 14 mudguard; 15 rear wheel; 16 left tilt protection bar; 17 right anti-tip bar; 18 support rods; 19 seat frames; 20 seat cushions; 21 lower backrest; 22 upper backrest; 23 left armrest; 24 right armrest; 25 upper control unit; 26 Backrest adjustment bars; 27 back cushions. Detailed descriptions

[0016] The technical solutions of the embodiments of this utility model are described clearly and completely below with reference to the accompanying drawings of the embodiments. It is understood that the described embodiments represent only a portion of the embodiments of this utility model and not all embodiments. All further embodiments that a person skilled in the art can obtain based on the embodiments of this utility model without inventive step are within the scope of protection of this utility model.

[0017] With reference to the Fig. 1-3 describes a lightweight wheelchair with an independent suspension structure comprising a chassis structure and a seat frame structure, wherein the seat frame structure is provided on the chassis structure; a drive unit arranged on the chassis structure; a wheel assembly arranged on the chassis structure, wherein the wheel assembly is arranged on a side of the chassis structure facing away from the seat frame structure; Shock absorber springs 9 arranged on the chassis structure, wherein the shock absorber springs 9 are arranged between the chassis structure and the seat frame structure; and an upper control unit 25 arranged on the seat frame structure, wherein the upper control unit 25 is wirelessly connected to the drive unit.

[0018] The chassis structure further comprises a front frame assembly 4, a left rear frame member 7, and a right rear frame member 8, wherein the left rear frame member 7 and the right rear frame member 8 are each connected by means of bolted and nut connections at the midpoints of the two side edges of the front frame assembly 4, with one end of the left rear frame member 7 and one end of the right rear frame member 8 being connected to the front frame assembly 4. One end of the shock absorber spring 9 is fixedly connected to the two side edges of the front frame assembly 4, and the other end of the shock absorber spring 9 is fixedly connected to the left rear frame member 7 and the right rear frame member 8, respectively, with the front frame assembly 4 serving to support the left rear frame member 7 and the right rear frame member 8.

[0019] Furthermore, a hinged seat is arranged at the front end of the front frame assembly 4, and a footrest assembly 1 is attached to the hinged seat. The footrest assembly 1 is pivotally connected to the front frame assembly 4 and can be pivoted within a certain angular range.

[0020] The seat frame structure further comprises a seat frame 19, a lower backrest 21, and an upper backrest 22, the lower backrest 21 being attached to the rear ends of the two side edges of the seat frame 19 by means of a screw and nut connection. One lower end of the lower backrest 21 is fixedly connected to the seat frame 19, and the upper backrest 22 is connected to the other end of the two side edges of the lower backrest 21. A seat cushion 20 is arranged on one side of the seat frame 19 that is connected to the lower backrest 21, and a back cushion 27 is arranged on one side of the upper backrest 22 that is connected to the lower backrest 21.The seat frame 19 serves to hold the seat cushion 20 and forms the seat surface of the wheelchair, the lower backrest 21 serves to connect the seat frame 19 with the upper backrest 22, and the upper backrest 22 serves to hold the back cushion 27 and forms the backrest of the wheelchair.

[0021] Furthermore, support rods 18 are rigidly connected to the two side edges of the front frame assembly 4, with one end of each support rod 18 being rigidly connected to the front frame assembly 4 and the other end of each support rod 18 being rigidly connected to the two side edges of the seat frame 19, the seat frame 19 being arranged above the front frame assembly 4. A lower end of the lower backrest 21 is connected to a central position of the shock absorber spring 9. Backrest adjustment rods 26 are rigidly connected to the upper ends of the two side edges of the lower backrest 21, with the other ends of the backrest adjustment rods 26 being rigidly connected to the upper backrest 22. The support rods 18 serve to connect the front frame assembly 4 to the seat frame 19, and the backrest adjustment rods 26 serve to adjust the positions of the lower backrest 21 and the upper backrest 22.

[0022] Furthermore, on the side of the seat frame 19 that is fitted with the seat cushion 20, a left armrest 23 and a right armrest 24 are each fixedly attached, with the sides of the left armrest 23 and the right armrest 24 opposite the two side edges of the upper backrest 22 being fixedly connected to the two side edges of the upper backrest 22. The upper control unit 25 is attached to one end of the right armrest 24 facing away from the upper backrest 22. The left armrest 23 and the right armrest 24 serve to support the user's arms; the upper control unit 25 is located on the right armrest 24 and is used to operate the wheelchair.

[0023] The drive unit further comprises a battery box 5, a lower control unit 6, a left motor 11, and a right motor 12. The battery box 5 is mounted on a cross member at a central position on the front frame assembly 4, and the lower control unit 6 is attached to the battery box 5. The left motor 11 is attached to the end of the left rear frame tube 7 facing away from the front frame assembly 4 by means of a bolt and nut connection, and the right motor 12 is attached to the end of the right rear frame tube 8 facing away from the front frame assembly 4 by means of a bolt and nut connection. The battery box 5 and the lower control unit 6 serve to control the left motor 11 and the right motor 12.

[0024] The wheel assembly further comprises a left front wheel assembly 2, a right front wheel assembly 3, and rear wheels 15, wherein the left front wheel assembly 2 and the right front wheel assembly 3 are each attached to the front ends of the two side edges of the front frame assembly 4 by means of a screw and nut connection. A pivot axis of the rear wheel 15 is connected to an output shaft of the left motor 11, and a pivot axis of another rear wheel 15 is connected to an output shaft of the right motor 12, the rear wheels 15 being driven by the left motor 11 and the right motor 12.

[0025] Furthermore, a left anti-tip bar 16 is attached to a side of the left motor 11 facing the right motor 12, and a right anti-tip bar 17 is attached to a side of the right motor 12 facing the left motor 11, the left anti-tip bar 16 and the right anti-tip bar 17 serving to prevent the wheelchair from tipping over.

[0026] Furthermore, mudguards 14 are arranged above each of the rear wheels 15. A mudguard mounting plate 10 is fixedly connected to each end of the left rear frame tube 7 and the right rear frame tube 8, which are associated with the rear wheels 15, with another end of the mudguard mounting plate 10 being fixedly connected to the respective mudguard 14. A mudguard mounting tab 13 is fixedly connected to each of the sides of the left and right motors 11, 12, which are opposite the rear wheels 15, with another end of the mudguard mounting tab 13 being fixedly connected to the respective mudguard 14. The mudguards 14 serve to protect the left motor 11 and the right motor 12, and the mudguard mounting plates 10 and the mudguard mounting tabs 13 serve to stabilize the mudguards 14. Structure description:

[0027] Footrest assembly 1: This assembly has a plate-like structure and is connected to the front end of the front frame assembly 4 via the articulated seat, allowing for swivel angle adjustment. It serves to support and rest the user's feet. Its swivel design allows it to be adapted to different leg lengths and seating habits of various users, thereby improving leg support comfort.

[0028] Left front wheel assembly 2 and right front wheel assembly 3: These are each designed as a small-dimensioned wheel body structure and are attached to the front ends of the two side edges of the front frame assembly 4. Together with the rear wheels 15, they support the weight of the front section of the wheelchair, assist the steering function and ensure stable driving behavior, thereby guaranteeing the mobility of the wheelchair during movement.

[0029] Front frame assembly 4: This assembly is designed as a frame-like structure and is generally of a relatively standardized design. Connecting elements are provided at the midpoints of both side edges. As a core component of the chassis structure, it supports the left rear frame member 7 and the right rear frame member 8 and simultaneously provides a mounting base for components such as the footrest assembly 1, the battery box 5, and the support rods 18. It thus forms the essential frame for supporting the lower section of the wheelchair.

[0030] Battery box 5: It is designed as a cuboid, box-like structure and is mounted on a crossbar at a central position of the front frame assembly 4. It stores electrical energy and provides the power supply for the wheelchair's drive unit, in particular for the left motor 11, the right motor 12, and the lower control unit 6, thus ensuring the proper operation of the wheelchair.

[0031] Lower control unit 6: It is designed as a small, box-like structure and is attached to the battery box 5. It can receive wireless control commands sent from the upper control unit 25 and controls the operation of the left motor 11 and the right motor 12 according to these commands. It forms the control center of the wheelchair's drive system.

[0032] Left rear frame rod 7 and right rear frame rod 8: These are each designed as an elongated rod structure. One end of each is connected by means of a screw and nut connection to a central position on the respective side edge of the front frame assembly 4. They form an essential component of the chassis structure, serve to extend the support area of ​​the chassis, and simultaneously provide mounting and support points for components such as the left engine 11, the right engine 12, the shock absorber springs 9, and the mudguard mounting plates 10.

[0033] Shock absorber springs 9: They are designed as a spiral elastic structure. One end is rigidly connected to the two side edges of the front frame assembly 4, and the other end is rigidly connected to the left rear frame bar 7 and the right rear frame bar 8, respectively. When the wheelchair is driven on uneven surfaces, the inherent elastic change in length of the shock absorber springs 9 converts the relative kinetic energy of the chassis structure caused by vibrations into elastic potential energy, thus damping the majority of the vibrations and reducing the vibration amplitude transmitted to the seat frame structure.

[0034] Mudguard mounting plates 10: These are designed as plate-shaped connecting elements. One end is fixedly connected to the ends of the left rear frame tube 7 and the right rear frame tube 8, which are associated with the rear wheels 15, and the other end is fixedly connected to the mudguards 14. In conjunction with the mudguard mounting tabs 13, they serve to fix and stabilize the mudguards 14, thus preventing the mudguards 14 from wobbling while driving.

[0035] Left motor 11 and right motor 12: They are each mounted at one end of the left rear frame bar 7 and the other at the right rear frame bar 8, respectively, opposite the front frame assembly 4. They receive control commands from the lower control unit 6 and drive the rear wheels 15 directly via an output shaft, thus providing propulsion for movements such as moving forward, backward, and steering the wheelchair.

[0036] Mudguard mounting tabs 13: These have a plate-like structure. One end is firmly connected to one side of the left motor 11 or the right motor 12, which corresponds to the rear wheels 15, and the other end is firmly connected to the mudguards 14. In conjunction with the mudguard mounting plates 10, they further increase the mounting stability of the mudguards 14 and prevent the mudguards from loosening.

[0037] Mudguards 14: They are designed as an arc-shaped, plate-like structure and are arranged above the rear wheels 15. They serve to block spray, mud, dust, and the like that thrown up by the rear wheels 15 while driving, in order to prevent splashing of the left engine 11, the right engine 12, and the user, and thus to fulfill a protective function.

[0038] Rear wheels 15: They are designed as wheel bodies with a comparatively large diameter. Each rear wheel 15 has a pivot axis connected to an output shaft of the left motor 11 or the right motor 12. Driven by the left motor 11 and the right motor 12, the rear wheels 15 rotate and form the essential structural element for the wheelchair's movement; they bear the weight of the rear of the wheelchair and provide the propulsion.

[0039] Left anti-tip bar 16 and right anti-tip bar 17: These are designed as rod-shaped or frame-shaped structures and are attached to one side of the left motor 11 and the other of the right motor 12, respectively, on the side facing the opposite motor. When traveling on inclined surfaces or in sudden situations, this effectively increases the stability of the wheelchair, prevents tipping, and ensures the user's safety while seated.

[0040] Support rods 18: They are designed as an elongated rod structure. One end is rigidly connected to the two side edges of the front frame assembly 4, and the other end is rigidly connected to the two side edges of the seat frame 19. This provides stable support for the seat frame 19 above the front frame assembly 4, increases the connection strength between the seat frame structure and the chassis structure, and ensures the load-bearing capacity of the seat frame structure.

[0041] Seat frame 19: It is designed as a frame-like structure and its overall shape is adapted to the seat cushion 20. It serves to hold the seat cushion 20 and provides a support base for the seat cushion. At the same time, it is an essential structural element for connecting it to the lower backrest 21, the support bars 18, and the left armrest 23 and the right armrest 24, and it bears the user's body weight.

[0042] Seat cushion 20: It is designed as a soft, cushion-like structure and is positioned on one side of the seat frame 19, which is connected to the lower backrest 21. It is in direct contact with the user's body, provides comfortable seat support, and reduces discomfort during prolonged sitting.

[0043] Lower backrest 21: It is designed as a frame-like, plate-shaped structure. At the rear ends of the two side edges, it is connected to the seat frame 19 by means of a screw and nut connection; furthermore, one lower end of the lower backrest 21 is fixedly connected to the seat frame 19, and the upper backrest 22 is connected to the other end of the two side edges. The lower backrest 21 connects the seat frame 19 to the upper backrest 22 and supports the lumbar and back area of ​​the user. In addition, the lower end of the lower backrest 21 is connected to a central position of the shock absorber spring 9, which further reduces the transmission of vibrations.

[0044] Upper backrest 22: It is designed as a frame-like, plate-shaped structure and is connected to the upper ends of the two side edges of the lower backrest 21. It serves to hold the back cushion 27, supports the upper back area of ​​the user and improves back comfort when sitting.

[0045] Left armrest 23 and right armrest 24: They are designed as elongated armrest structures and are each firmly attached to the side of the two side edges of the seat frame 19 that is fitted with the seat cushion 20; at the same time, they are firmly connected to the two side edges of the upper backrest 22. They serve to support the user's arms and provide a comfortable resting position. In addition, the right armrest 24 provides a mounting position for the upper control unit 25.

[0046] Upper control unit 25: It is designed as a small control device and is attached to the end of the right armrest 24 facing away from the upper backrest 22. As a central component of the human-machine interaction, the user can issue wireless control commands via control buttons to control the wheelchair's driving state, thus enabling easy operation.

[0047] Backrest adjustment rods 26: These are designed as a rod-shaped adjustment structure. One end is fixed to the upper ends of the two side edges of the lower backrest 21, and the other end is fixed to the upper backrest 22. By adjusting their position, the user can change the angle between the lower backrest 21 and the upper backrest 22 to meet different requirements for back support and sitting posture.

[0048] Back cushion 27: It is designed as a soft, cushion-like structure and is positioned on one side of the upper backrest 22, which is connected to the lower backrest 21. In conjunction with the upper backrest 22, it provides soft and comfortable support for the user's upper back and improves seating comfort in the back area.

[0049] Operating principle: The battery box 5, mounted on a cross member at a central position in the front frame assembly 4, provides the power supply for the entire system. The lower control unit 6 works in conjunction with the battery box 5 and receives wireless control commands sent by the upper control unit 25, which is mounted on the right armrest 24. As the central component of the human-machine interaction, the upper control unit 25 allows the user to operate the system easily while seated. After the commands are transmitted, the lower control unit 6 precisely controls the operation of the left motor 11 and the right motor 12, which are located at the ends of the left rear frame tube 7 and the right rear frame tube 8, respectively.The motor output shafts directly drive the rear wheels 15, enabling movements such as forward, reverse, and steering of the wheelchair and providing the user with propulsion for daily mobility. Between the chassis structure and the seat frame structure, the shock absorber springs 9 are rigidly connected between the two side edges of the front frame assembly 4 and the left rear frame bar 7 and the right rear frame bar 8, respectively. When the wheelchair travels on uneven surfaces, the irregularity of the surface causes vibrations in the chassis structure. In this case, the shock absorber springs 9 undergo elastic changes in length corresponding to the amplitude of the vibration.The front frame assembly 4 supports the left rear frame member 7 and the right rear frame member 8, and the shock absorber springs 9 convert the relative kinetic energy generated by the vibrations between these components into elastic potential energy, so that the majority of the vibrations are dampened by the compression and rebound of the springs. Furthermore, a lower end of the lower backrest 21 is connected to a central position of the shock absorber springs 9, further attenuating the transmission of vibrations to the seat frame structure and reducing the vibration amplitude transmitted to the seat cushion 20 and the back cushion 27. In the chassis structure, the left rear frame member 7 and the right rear frame member 8 are each connected to the front frame assembly 4 by means of bolted and nut connections, thus forming a stable lower support frame.The support rods 18, arranged on the two side edges of the front frame assembly 4, are rigidly connected at one end to the front frame assembly 4 and at the other end to the seat frame 19. This provides stable support for the seat frame 19 above the front frame assembly 4 and ensures the load-bearing capacity of the seat frame structure. Within the seat frame structure, the seat frame 19 serves to hold the seat cushion 20, the lower backrest 21 connects the seat frame 19 to the upper backrest 22, and the upper backrest 22 holds the back cushion 27. The interaction of these components provides comfortable support. Furthermore, the backrest adjustment rods 26 connect the lower backrest 21 to the upper backrest 22, allowing the user to adjust the backrest angle by changing their position.The footrest assembly 1, which is pivotally attached to the front end of the front frame assembly 4, can be swivelled and adjusted to accommodate different leg support requirements. Furthermore, the left anti-tip bar 16 and the right anti-tip bar 17 are attached to the opposing sides of the left motor 11 and the right motor 12, respectively, effectively preventing the wheelchair from tipping over. The mudguards 14, located above the rear wheels 15, are secured by a double fastening: the mudguard mounting plates 10 connect the left rear frame bar 7 and the right rear frame bar 8 to the mudguards 14, respectively, and the mudguard mounting tabs 13 connect the motors to the mudguards 14. This effectively blocks splashing water, mud, and dust to prevent splashing of the motors and the user.

[0050] Although exemplary embodiments of the present utility model have been shown and described, it is clear to the person skilled in the art that numerous changes, modifications, substitutions, and variations can be made to these exemplary embodiments without deviating from the fundamental concept and spirit of the present utility model. The scope of protection of the present utility model is determined by the appended claims and their equivalents.

Claims

Lightweight wheelchair with independent suspension structure, characterized in that it comprises a chassis structure and a seat frame structure, wherein the seat frame structure is provided on the chassis structure; a drive unit arranged on the chassis structure; a wheel assembly arranged on the chassis structure, wherein the wheel assembly is arranged on a side of the chassis structure facing away from the seat frame structure; shock absorber springs (9) arranged on the chassis structure, wherein the shock absorber springs (9) are arranged between the chassis structure and the seat frame structure; and an upper control unit (25) arranged on the seat frame structure, wherein the upper control unit (25) is wirelessly connected to the drive unit. Lightweight wheelchair with independent suspension structure according to claim 1, characterized in that the chassis structure comprises a front frame assembly (4), a left rear frame bar (7) and a right rear frame bar (8), wherein the left rear frame bar (7) and the right rear frame bar (8) are each connected by means of a screw and nut connection at the central positions of the two side edges of the front frame assembly (4), wherein one end of the left rear frame bar (7) and one end of the right rear frame bar (8) are connected to the front frame assembly (4), wherein one end of the shock absorber springs (9) is fixedly connected to the two side edges of the front frame assembly (4), and the other end of the shock absorber springs (9) is fixedly connected to the left rear frame bar (7) and the right rear frame bar (8), respectively. Lightweight wheelchair with independent suspension structure according to claim 2, characterized in that an articulated seat is arranged at the front end of the front frame assembly (4), to which a footrest assembly (1) is attached. Lightweight wheelchair with independent suspension structure according to claim 1, characterized in that the seat frame structure comprises a seat frame (19), a lower backrest (21) and an upper backrest (22), wherein the lower backrest (21) is attached to the rear ends of the two side edges of the seat frame (19) by means of a screw and nut connection, wherein a lower end of the lower backrest (21) is fixedly connected to the seat frame (19), and the upper backrest (22) is connected to the other end of the two side edges of the lower backrest (21), wherein a seat cushion (20) is arranged on one side of the seat frame (19) that is connected to the lower backrest (21), and a back cushion (27) is arranged on one side of the upper backrest (22) that is connected to the lower backrest (21). Lightweight wheelchair with independent suspension structure according to claim 4, characterized in that support rods (18) are rigidly connected to the two side edges of the front frame assembly (4), wherein one end of each support rod (18) is rigidly connected to the front frame assembly (4) and the other end of the support rod (18) is rigidly connected to the two side edges of the seat frame (19), wherein the seat frame (19) is arranged above the front frame assembly (4), and the lower end of the lower backrest (21) is connected to a central position of the shock absorber springs (9), wherein backrest adjustment rods (26) are rigidly connected to the upper ends of the two side edges of the lower backrest (21), and the other ends of the backrest adjustment rods (26) are rigidly connected to the upper backrest (22). Lightweight wheelchair with independent suspension structure according to claim 4, characterized in that a left armrest (23) and a right armrest (24) are fixedly attached to the side of the two side edges of the seat frame (19) provided with the seat cushion (20), wherein the sides of the left armrest (23) and the right armrest (24) opposite the two side edges of the upper backrest (22) are each fixedly connected to the two side edges of the upper backrest (22), and wherein the upper control unit (25) is attached to an end of the right armrest (24) facing away from the upper backrest (22). Lightweight wheelchair with independent suspension structure according to claim 2, characterized in that the drive unit comprises a battery box (5), a lower control unit (6), a left motor (11) and a right motor (12), wherein the battery box (5) is mounted on a cross member at a central position of the front frame assembly (4), wherein the lower control unit (6) is mounted on the battery box (5), wherein the left motor (11) is mounted on an end of the left rear frame rod (7) facing away from the front frame assembly (4) by means of a screw and nut connection, and wherein the right motor (12) is mounted on an end of the right rear frame rod (8) facing away from the front frame assembly (4) by means of a screw and nut connection. Lightweight wheelchair with independent suspension structure according to claim 7, characterized in that the wheel arrangement comprises a left front wheel assembly (2), a right front wheel assembly (3) and rear wheels (15), wherein the left front wheel assembly (2) and the right front wheel assembly (3) are each attached to the front ends of the two side edges of the front frame assembly (4) by means of a screw and nut connection, wherein a pivot axis of the rear wheel (15) is connected to an output shaft of the left motor (11), and wherein a pivot axis of a further rear wheel (15) is connected to an output shaft of the right motor (12). Lightweight wheelchair with independent suspension structure according to claim 7, characterized in that a left anti-tip bar (16) is attached to a side of the left motor (11) facing the right motor (12), and that a right anti-tip bar (17) is attached to a side of the right motor (12) facing the left motor (11). Lightweight wheelchair with independent suspension structure according to claim 8, characterized in that a mudguard (14) is arranged above each of the rear wheels (15), wherein a mudguard mounting plate (10) is fixedly connected to each end of the left rear frame rod (7) and the right rear frame rod (8) associated with the rear wheels (15), wherein another end of the mudguard mounting plate (10) is fixedly connected to the mudguard (14), wherein a mudguard mounting tab (13) is fixedly connected to each of the sides of the left and right motors (11, 12) opposite the rear wheels (15), and wherein another end of the mudguard mounting tab (13) is fixedly connected to the mudguard (14).

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