Folding anti-damage wheelchair

Abstract

The folding type damage prevention wheelchair comprises a supporting frame and a bottom frame beam which are arranged on the two sides respectively, the supporting frame supports rear wheels and handles, the bottom frame beam supports the rear wheels and front wheels, and the supporting frame and the bottom frame beam are in rigid connection. The scissor type folding frame is arranged between the supporting frames on the two sides and the bottom frame beam, the supporting frames and the bottom frame beam are provided with limiting supports for limiting unfolding of the folding frame respectively, the hub is arranged on the rear wheel and provided with a containing cavity, and the ultrathin motor is embedded in the containing cavity. The bottom of the supporting frame is fixedly connected with the ultra-thin motor, so that the wheelchair is more compact when folded, no motor protrudes in the space of the bottom of the wheelchair, and the situation that the motor of the wheelchair is damaged or the folding mechanism is mistakenly folded even if the wheelchair passes through an obstacle is avoided.

Description

Technical Field

[0001] This application relates to the field of electric wheelchair technology, specifically to the field of folding, damage-resistant wheelchair technology. Background Technology

[0002] As society's demand for accessible travel continues to grow, electric wheelchairs, as important assistive mobile devices, are constantly being designed to offer greater convenience and a better user experience.

[0003] However, most existing electric wheelchairs still use a traditional drive system design, with the motor typically mounted on the side of the wheels. While this layout is effective, it also presents a series of challenges. On the one hand, for ease of carrying and storage, many electric wheelchairs adopt a design that folds inwards from both sides. However, because the motor is located near the wheels, it increases the overall structural thickness, making the folding operation complex and less compact, thus affecting the user experience.

[0004] On the other hand, traditional motors are relatively large, especially when installed at the bottom. During daily use, they are easily impacted by obstacles such as thresholds and uneven surfaces, increasing the risk of motor damage or performance degradation, thus affecting the reliability and lifespan of the wheelchair. Summary of the Invention

[0005] In response to the aforementioned needs, this application proposes a foldable, damage-resistant wheelchair. By adopting an ultra-thin motor design and optimizing its layout within the wheelchair, the space occupied by the motor is reduced, allowing the wheelchair to fold more compactly while preventing damage to the motor from external collisions.

[0006] To achieve the above objectives, the present application adopts the following technical solution:

[0007] A foldable, damage-resistant wheelchair includes a support frame and a base frame beam respectively disposed on both sides. The support frame supports the rear wheel and handle, and the base frame beam supports the rear wheel and the front wheel. The support frame and the base frame beam are rigidly connected to each other.

[0008] It also includes a scissor-type folding frame disposed between the support frame and the base frame beam on both sides, wherein the support frame and the base frame beam are respectively provided with limiting supports to restrict the unfolding of the folding frame;

[0009] It also includes a wheel hub located on the rear wheel and having a receiving cavity, and an ultra-thin motor embedded in the receiving cavity, with the bottom of the support frame fixedly connected to the ultra-thin motor.

[0010] Thus, the scissor-type folding frame design, combined with the rigid connection between the side support frames and the base frame beam, makes the wheelchair more compact when folded. At the same time, the support frames and base frame beam are equipped with limiting supports, providing stable support for the wheelchair when unfolded.

[0011] Meanwhile, because the ultra-thin motor is embedded in the rear wheel, there is no motor protruding in the space at the bottom of the wheelchair, so that even if it passes over an obstacle, it will not cause damage to the motor or cause the folding mechanism to fold accidentally.

[0012] In some possible implementations, the underframe beam is a U-shaped bent structure, with its openings connected to the support frame.

[0013] In some possible implementations, the folding frame is fixedly connected at the lower end and placed on the limiting support at the upper end.

[0014] In some possible implementations, the lower end of the folding frame is fixedly connected to the base frame beam.

[0015] In some possible implementations, the bottom end of the support frame is provided with a rearwardly extending curved portion, and the support frame and the curved portion are an integral structure.

[0016] In some possible implementations, the rear wheel is mounted on the curved section.

[0017] In some possible implementations, a connecting rod is also included that is fixedly connected to the curved portion, and the ultra-thin motor is connected to the connecting rod.

[0018] In some possible implementations, a positioning flange disposed between the connecting rods is also included. Attached Figure Description

[0019] Figure 1 This is an overall schematic diagram of the foldable, damage-resistant wheelchair of this application;

[0020] Figure 2 This is a schematic diagram of the frame of the foldable, damage-resistant wheelchair of this application;

[0021] Figure 3 This is a schematic diagram of the wheel in this application;

[0022] Figure 4 This is a schematic diagram of the installation state of the wheel and the ultra-thin motor in this application;

[0023] Figure 5 This is a schematic diagram of the installation status of the drive system and framework in this application;

[0024] Figure 6 This is a schematic diagram of the mounting end of the ultra-thin motor and frame in this application;

[0025] Figure 7 This is an exploded schematic diagram of the ultra-thin motor in this application;

[0026] Figure 8 This is a schematic diagram of the mounting end of the ultra-thin motor and the wheel in this application;

[0027] Figure 9 This is a schematic diagram of the installation relationship between the ultra-thin motor drive shaft and the rotor mounting bracket in this application;

[0028] Figure 10 This is a schematic diagram showing the installation relationship between the ultra-thin motor output hub and the reduction gear in this application;

[0029] Figure 11 This is a schematic diagram showing the installation relationship between the housing, stator core, and gearbox in this application;

[0030] Figure 12 This is a schematic diagram of the deceleration device in this application. Detailed Implementation

[0031] The following examples further illustrate the features of this application and other related features in detail, so as to facilitate understanding by those skilled in the art:

[0032] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions in the attached diagrams, while the terms “bottom surface,” “top surface,” “inner,” and “outer” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0033] Furthermore, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this case based on the specific circumstances.

[0034] Please refer to Figure 1 and Figure 2 The foldable, damage-resistant wheelchair of this application includes a support frame 1 and a base beam 2 respectively disposed on both sides, and the support frame 1 and the base beam 2 are rigidly connected to each other to form a frame structure. The support frame 1 vertically connects the handle 3 and the rear wheel 41, while the base beam 2 supports the rear wheel 41 and the front wheel 42.

[0035] At this point, a scissor-type folding frame 5 is installed between the support frames 1 and the base beam 2 on both sides. Specifically, it can be folded back directly when folded, but needs to be limited when unfolded to maintain a stable angle. For this purpose, the support frames 1 and the base beam 2 are respectively provided with limiting supports 51 to restrict the unfolding of the folding frame 5. Their functions and structures are the same, therefore the same reference numerals will be used in the following description. Because the supporting frames 1 and the base beam 2 are respectively provided with limiting supports 51, stable support can be provided for the wheelchair in the unfolded state.

[0036] In some preferred embodiments, the base frame beam 2 has a U-shaped bent structure, with its openings connected to the support frame 1. Specifically, it is divided into a lower base frame beam 21 and an upper base frame beam 22, wherein the lower end of the folding frame 5 is fixedly connected to the lower base frame beam 21, while the upper end is placed on the aforementioned limiting support 51. Specifically, the limiting support 51 has an upper opening; when folded, the upper end of the folding frame 5 will disengage upwards, and when unfolded, it will be subjected to downward force to form a self-locking mechanism.

[0037] Thus, through the scissor-style folding frame 5 design, combined with the rigid connection between the side support frames 1 and the base frame beam 2, the wheelchair achieves a more compact structure when folded. The seat cushion and backrest can be made of high-elasticity mesh, nylon, or polyester fiber. Using these materials in folding wheelchairs is a common industry practice, and will not be specifically limited or elaborated upon. As for the footrests 6, they can be folded to the base frame beam 2 via a rotating shaft. Since the footrests 6 themselves experience downward pressure when stepped on, it is sufficient to keep them in a horizontal position. This is a relatively common folding structure, and will not be described in detail.

[0038] Please refer to the reference. Figures 2 to 4 At this time, a hub 43 is provided on the rear wheel 41, and a receiving cavity 431 for embedding the ultra-thin motor 7 is provided inside the hub 43. The outer side of the hub 43 is the tire 432. The bottom of the support frame 1 is fixedly connected to the ultra-thin motor 7. For details, please refer to Figure 2 and Figure 5 The support frame 1 has a rearward-extending curved section 11 at its bottom. The support frame 1 and the curved section 11 are an integral structure, and the rear wheel 41 is mounted on the curved section 11. This not only enhances the stability and strength of the overall structure, but also provides a more stable mounting position for the rear wheel 41, improving the overall durability and driving stability of the wheelchair.

[0039] The specific connection method is as follows: the bent portion 11 is provided with connecting rods 12 that are fixedly connected to it. The connecting rods 12 are located on both sides of the bent portion 11 and are fixedly connected to the ultra-thin motor 7 through the connecting rods 12. Specifically, the ultra-thin motor 7 and the connecting rods 12 are provided with bolt connection holes at corresponding positions. The fixed installation method of two rods and four holes is a common technical means in the industry, and the setting method of the mounting holes will not be described in detail. As a positioning structure during installation, a positioning flange 13 is provided between the connecting rods 12. That is, during installation, the bent portion 11 and the ultra-thin motor 7 are first positioned by the mounting flange 13, and then the connection is made securely by the connecting rods 12.

[0040] Thus, because the ultra-thin motor 7 is embedded in the rear wheel 41, there is no motor protruding in the space at the bottom of the wheelchair, so that even if it passes over an obstacle, it will not cause damage to the motor or cause the folding mechanism to fold accidentally.

[0041] The following is a detailed explanation of the implementation of the ultra-thin motor 7. Please refer to [link / reference]. Figures 7 to 9 The ultra-thin motor 7 described in this application includes a housing 71 and a top cover 72. The top cover 72 is positioned in the direction of the curved portion 11, and the housing 71 is positioned in the direction of the hub 43 and is embedded within the hub 43. An output hub 73, which is fixedly connected to the hub 43, is located on the outer side of the housing 71. The output hub 73 and the hub 43 can be bolted together from the outer side of the hub 43, so that the rotation of the output hub 73 drives the rotation of the hub 43.

[0042] Please refer to the reference. Figure 7 and Figure 11 A mounting ring 711 is provided on the inner ring of the housing 71. Meanwhile, the output hub 73 is connected to the reduction gear 74, which is coaxially connected to the output end. Please refer to [reference needed] for the reduction gear 74. Figure 12 Specifically, it employs a planetary reduction mechanism and includes a gearbox 741 that fits into the mounting ring 711. The inner ring of the gearbox 741 has a gear ring 742. The gearbox 741 is bolted to the outer side of the housing 71. A reduction mechanism 743 is disposed inside the gearbox 741, meshes with the gear ring 742, and drives the output hub 73 to rotate.

[0043] Please refer to the reference. Figure 7 , Figure 10 and Figure 12 Specifically, the reduction mechanism 743 includes a planetary carrier 7431 that fits into the gearbox 741 and a reduction gear set 7432 that is annularly arranged within the planetary carrier 7431 and meshes with the gear ring 742. A drive shaft 75 passes through the middle of the reduction gear set 7432 and has a drive gear 751 meshing with it. As a power transmission and positioning device, it also includes multiple guide posts 744 that connect the reduction gear set 7432 and the output hub 73 and extend from the output hub 73 to the wheel hub 43, preferably three guide posts 744. The output hub 73 is positioned by the guide posts 744 and then fixedly connected to the planetary carrier 7431 from the outside of the wheel hub 43 by bolts passing through the output hub 73. That is, rotation of the drive shaft 75 will cause the reduction gear set 7432 to rotate relative to the gearbox 741, and at this time, the planetary carrier 7431 fixing the reduction gear set 7432 will rotate synchronously, driving the output hub 73 to output rotational power.

[0044] Furthermore, regarding the bearing mounting method for the rotating mechanism, the bearing at one end of the output hub 73 is configured such that a first bearing Z1 supporting the output hub 73 is provided on the side of the gear ring 742 of the gearbox 741 facing the output hub 73. In this case, the first bearing Z1 spans between the gearbox 741 and the housing 71, meaning that the side of the gearbox 741 facing the housing 71 has at least a portion of space less than the width of the first bearing Z1 between it and the gear ring 742. Thus, by spanning across the housing, the first bearing Z1 simultaneously supports both the gearbox 741 and the housing 71, ensuring precise alignment and stable operation of the output hub 73's transmission.

[0045] The bearing on the other side of the corresponding reduction device 74 is the second bearing Z2, which is located in the gearbox 741 on the other side of the gear ring 742, that is, on the side facing the upper cover 72.

[0046] The support for the drive shaft 75 is described below. At one end of the output hub 73, a third bearing Z3 is provided on the inner ring of the output hub 73 to support the drive shaft 75. Since the output hub 73 is fixed to the planetary carrier 7431 and rotates synchronously, and the drive shaft 75 passes through the reduction gear set 7432 and meshes with it synchronously, the drive shaft 75 forms a stable support in both transmission and at one end of the output hub 73.

[0047] The power mechanism for drive shaft 75 employs the principle of a brushless DC motor (BLDC), utilizing the interaction between the magnetic field generated by an energized coil and a permanent magnet to produce rotational motion. Please refer to [reference needed]. Figure 7 and Figure 11 In this application, an energized coil is used as the stator and a permanent magnet is used as the rotor. The stator core 76, which is wound with the energized coil, is fitted around the mounting ring 711. After interference fit, the stator core 76 is prevented from rotating relative to the mounting ring 711 by means of a slot structure or other means. The winding of the coil and the anti-rotation structure are common technical means in the industry and will not be described in detail.

[0048] Multiple rotors 77 are arranged around the outer periphery of the stator core 76. Each rotor 77 consists of multiple permanent magnets arranged around the outer periphery of the stator core 76. Therefore, a rotor fixing bracket 771 is used for fixing, and a magnet fixing ring 772 is provided around its outer periphery to ensure a stable fixation. The rotor fixing bracket 771 is a rotating wheel disposed between the stator core 76 and the upper cover 72, rotating relative to the stator core 76 as the rotors 77 rotate.

[0049] Thus, by setting a mounting ring 711 on the housing 71, and setting a speed reduction device 74 and a drive device (stator core 76 and rotor 77) on the inner and outer sides of the mounting ring 711 respectively, and setting a rotor fixing bracket 771 on one side of the top cover 72, the structure of the entire motor forms a drive and output separation in the same radial range relative to the mounting ring 711, which greatly saves the axial space of the motor and realizes an ultra-thin design.

[0050] Further, please refer to Figure 7 and Figure 9 The rotor fixing frame 771 has shaft heads 7711 at both ends, and its support on the output hub 73 side is a fourth bearing Z4 nested in the planetary carrier 7431 and supporting the rotor fixing frame 771.

[0051] On one side of the upper cover 72, there is a bearing chamber 721 on the upper cover 72, which supports another bearing of the rotor fixing frame 771, and the fifth bearing Z5 is nested in the bearing chamber 721 and covers the shaft head 7711.

[0052] Furthermore, the drive shaft 75 is connected to the shaft end 7711 on the upper cover 72 side of the rotor fixing frame 771 via a pin 752. A groove for the pin 752 is provided inside the shaft end 7711, allowing for relative fixation of the drive shaft 75 and the rotor fixing frame 771. This connection structure using the pin 752 to achieve synchronous rotation is a common industry practice, and will not be described in further detail.

[0053] Thus, the drive shaft 75 connects the rotor mounting bracket 771 and the output hub 73, providing stable support for the entire motor shaft. When the stator core 76 is energized, the rotor mounting bracket 771 rotates along with the rotor 77, at which point the drive shaft 75 receives power to rotate.

[0054] Please refer to Figure 9 The electric wheelchair drive system using the ultra-thin motor described above also includes a driver (not shown in the figure). The driver is installed in a mounting slot 712 on the outer periphery of the housing 71, allowing for sealing measures such as potting after installation. Furthermore, the mounting slot 712 has a through hole 713 in the space between the top cover 71 and the rotor mounting bracket 771 for connecting a power cord.

[0055] As stated above, this case protects a foldable, damage-resistant wheelchair, and all technical solutions that are the same as or similar to those in this case should be considered to fall within the scope of protection of this case.

Claims

1. A foldable, damage-resistant wheelchair, characterized in that, It includes a support frame (1) and a base frame beam (2) respectively set on both sides. The support frame (1) supports the rear wheel (41) and the handle (3). The base frame beam (2) supports the rear wheel (41) and the front wheel (42). The support frame (1) and the base frame beam (2) are rigidly connected to each other. It also includes a folding frame (5) disposed between the support frame (1) and the base beam (2) on both sides, wherein the support frame (1) and the base beam (2) are respectively provided with limiting supports (51) to restrict the unfolding of the folding frame (5); It also includes a wheel hub (43) provided on the rear wheel (41) and having a receiving cavity (431) and an ultra-thin motor (7) embedded in the receiving cavity (431), the bottom of the support frame (1) being fixedly connected to the ultra-thin motor (7).

2. The foldable, damage-resistant wheelchair as described in claim 1, characterized in that, The base beam (2) is a U-shaped bent structure, and its opening is connected to the support frame (1).

3. A foldable, damage-resistant wheelchair as described in claim 1, characterized in that, The folding frame (5) is fixedly connected at the lower end and placed on the limiting support (51) at the upper end.

4. A foldable, damage-resistant wheelchair as described in claim 3, characterized in that, The lower end of the folding frame (5) is fixedly connected to the base frame beam (2).

5. A foldable, damage-resistant wheelchair as described in claim 1, characterized in that, The bottom end of the support frame (1) is provided with a curved part (11) extending in the rearward direction, and the support frame (1) and the curved part (11) are an integral structure.

6. A foldable, damage-resistant wheelchair as described in claim 5, characterized in that, The rear wheel (41) is mounted on the curved section (11).

7. A foldable, damage-resistant wheelchair as described in claim 6, characterized in that, It also includes a connecting rod (12) fixedly connected to the bent portion (11), and the ultra-thin motor (7) is connected to the connecting rod (12).

8. A folding, damage-resistant wheelchair as described in claim 7, characterized in that, It also includes a positioning flange (13) disposed between the connecting rods (12).

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