A compact electric wheelchair transmission structure and wheelchair

Abstract

This case relates to a compact electric wheelchair transmission structure and its application in a wheelchair. The wheelchair includes a fixed plate connecting a support beam and a base frame beam at the rear wheel of the wheelchair, and an off-axis motor mounted on the outside of the fixed plate. The off-axis motor includes a reduction section fixed to the fixed plate, an output section disposed on one side of the fixed plate of the reduction section and directly connected to the rear wheel for direct drive, and a drive section offset from the output section and disposed towards the inside of the wheelchair. A wheel arch is formed at the rear wheel by the support beam and the base frame beam and divided by the fixed plate. The drive section passes through the wheel arch and is disposed towards the inside of the wheelchair. The fixed plate on the wheel arch can improve the structural strength and stability of the entire wheel arch.

Description

Technical Field

[0001] This application relates to the field of electric wheelchair technology, specifically to a compact electric wheelchair transmission structure and wheelchair technology. Background Technology

[0002] For users who frequently use electric wheelchairs in public places or when moving between locations, the ability to quickly and easily fold and unfold them is particularly important. Compared to strollers designed primarily for children, electric wheelchairs, which need to support the weight of adults and provide sufficient support and comfort, mostly adopt a folding design with the sides folding inwards to meet the need for compact storage.

[0003] However, this design approach faces a significant problem: the motors equipped with the drive wheels (usually the rear wheels) can easily come into contact with each other during folding, which not only limits the minimum size that the wheelchair can achieve, but may also damage the motors. Summary of the Invention

[0004] In response to the aforementioned needs, this application proposes a compact electric wheelchair transmission structure and wheelchair, which aims to achieve compact folding, improved portability, and ensure user comfort and safety by adopting an ultra-thin off-axis motor and a novel frame support structure design.

[0005] To achieve the above objectives, the present application adopts the following technical solution:

[0006] In the first aspect, this application proposes a compact electric wheelchair transmission structure, including a fixing plate connecting a support beam and a base frame beam at the rear wheel of the wheelchair, and an eccentric motor mounted on the outside of the fixing plate;

[0007] The eccentric motor includes a reduction section fixed to the fixed plate, an output section located on one side of the fixed plate of the reduction section and directly connected to the rear wheel for direct drive, and a drive section offset from the output section and located towards the inside of the wheelchair.

[0008] A wheel arch ring is formed at the rear wheel by the support beam and the base frame beam and is divided by the fixing plate. The drive unit is disposed through the wheel arch ring toward the inside of the wheelchair.

[0009] In this way, by utilizing the support beams and base frame beams of the wheelchair's main frame to form a wheel arch at the rear wheel, and installing a fixing plate there, the structural strength and stability of the entire wheel arch can be improved. Simultaneously, an off-axis motor is installed on the outside of this fixing plate, and its drive unit, which occupies space, is positioned inwards through the wheel arch space, further reducing its footprint. Furthermore, its output unit and the rear wheel can be directly connected at close range, simplifying the overall structure and improving overall rotational efficiency.

[0010] In some possible implementations, the reduction section of the eccentric motor is a multi-stage gear transmission structure.

[0011] In some possible implementations, the multi-stage gear transmission structure is a three-stage gear transmission structure.

[0012] In some possible implementations, transmission bearings are provided at both ends of the output section along its axial direction.

[0013] In some possible implementations, the support beam and the base beam are provided with flanges at the wheel arch, and the fixing plate is installed at the flanges.

[0014] In some possible implementations, the fixation plate is mounted on the inside of the wheelchair.

[0015] Secondly, this application proposes a wheelchair that uses the compact electric wheelchair transmission structure described above, wherein the drive unit is offset on both sides of the wheelchair, corresponding to the wheel arches on both sides that are divided by the fixing plate.

[0016] In some possible implementations, the support beam and the underframe beam are provided with support connecting rods on the outer side of the wheel arch facing the front wheel.

[0017] In some possible implementations, the rear end of the underframe beam is provided with auxiliary wheels. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the wheelchair to which the compact electric wheelchair transmission structure of this application is applied;

[0019] Figure 2 This is a side view of the wheelchair to which the compact electric wheelchair transmission structure of this application is applied;

[0020] Figure 3 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the assembly of the eccentric motor and wheel in this application;

[0022] Figure 5 This is a cross-sectional view of the off-axis motor of this application;

[0023] Figure 6 This is a schematic diagram of the eccentric motor reduction gear of this application. Detailed Implementation

[0024] 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:

[0025] 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.

[0026] 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.

[0027] Please refer to Figure 1 and Figure 2 This application discloses a compact electric wheelchair transmission structure. The wheelchair's main frame includes a support beam 110 connected to a handlebar 100 and a base frame beam 300 spanning the front wheel 210 and the rear wheel 220. The support beam 110 and the base frame beam 300 are located on both sides of the wheelchair. An auxiliary wheel 400 is provided at the rear end of the base frame beam 300.

[0028] The wheelchair has a folding cross support frame on its inner side, which can fold inwards to the side support beams 110 and the base frame beam 300. This folding cross support structure is a common industry technique and will not be described in detail here. Other parts of the wheelchair are less relevant to this application and will also not be described in detail here.

[0029] Please refer to the reference. Figure 3 At this point, the support beam 110 and the base frame beam 300 form a wheel arch ring K1 at the rear wheel 220 of the wheelchair, and a fixing plate 500 is provided on the support beam 110 and the base frame beam 300 at the rear wheel 220 of the wheelchair, the fixing plate 500 dividing the wheel arch ring K1. In order to make the wheel arch ring K1 more stable, in some embodiments, the support beam 110 and the base frame beam 300 are provided with a support connecting rod 120 on the outer side of the wheel arch ring K1 facing the front wheel 210.

[0030] Furthermore, please refer to the references. Figure 3 and Figure 4An off-axis motor 600 is provided on the outer side of the fixed plate 500. Specifically, the off-axis motor 600 includes a reduction section 610 fixed to the fixed plate 500 and an output section 620 located on one side of the fixed plate 500 of the reduction section 610 and directly connected to the rear wheel 220. The output section 620 is directly connected to the rear wheel 220, simplifying the overall structure and improving the overall rotation efficiency. That is, the fixed plate 500 is located at the axial extension of the output section 620 and the rear wheel 220, ensuring overall stability. Correspondingly, a drive section 630 is provided offset towards the inside of the wheelchair from the output section 620. In this case, the drive section 630 passes through the wheel arch ring K1 and is positioned towards the inside of the wheelchair.

[0031] During fixing, a flange 510 is provided on the support beam 110 and the base frame beam 300 facing the wheel arch ring K1, and the fixing plate 500 is installed on the flange 510 to facilitate the assembly and disassembly of the entire wheelchair. Preferably, the fixing plate 500 is installed on the inner side of the flange 510, that is, facing the inner side of the wheelchair. At this time, the deceleration part 610 will face inward, that is, drive the rear wheel 220 to move towards the inner side of the wheelchair, making the overall wheelchair structure more compact.

[0032] Thus, by utilizing the wheel arch K1 formed at the rear wheel 220 by the support beam 110 and the base frame beam 300 of the wheelchair's main frame, and installing the fixing plate 500 there, the structural strength and stability of the entire wheel arch K1 can be improved. At the same time, an off-axis motor 600 is installed on the outside of this fixing plate 500, and its space-consuming drive unit 630 is installed through the space of the wheel arch K1 towards the inside of the wheelchair, further reducing its footprint.

[0033] Please refer to Figure 1 When the compact electric wheelchair transmission structure described above is applied to a wheelchair, the drive unit 630 can be offset on both sides of the wheelchair, corresponding to the wheel arch rings K1 divided by the fixing plate 500. Specifically, as shown in the figure, one drive unit 630 is located on the wheel arch ring K1 facing the front wheel 210, while the other drive unit 630 is located on the wheel arch ring K1 facing the auxiliary wheel 400.

[0034] The implementation method of the eccentric motor 600 is explained below. Please refer to [the provided text]. Figure 5 and Figure 6The drive unit 630 provides power, and the reduction unit 610 is a multi-stage gear transmission structure. In this embodiment, a three-stage gear transmission structure is adopted. The drive unit 630 transmits power to the first gear set 611 through gear transmission to achieve the first reduction. Simultaneously, the first gear set 611 includes a driven gear and a driving gear mounted coaxially. The driven gear of the second gear set 612, which meshes with the driving gear of the first gear set 611, and its coaxially mounted driving gear can be arranged towards the drive unit 630. A third driven gear 613 can be sequentially arranged. The actual thickness of the reduction unit 610 is the thickness of two gears, achieving an ultra-thin reduction unit 610. The method of coaxially arranging the driving and driven gears to complete the reduction is a common industry technique and will not be described in detail.

[0035] Furthermore, in order to enable the output section 620 to provide output power more stably, transmission bearings 621 are provided at both ends of the output section 620.

[0036] As stated above, this case protects a compact electric wheelchair transmission structure and wheelchair, and all technical solutions that are the same as or similar to this case should be considered to fall within the scope of protection of this case.

Claims

1. A compact electric wheelchair transmission structure, characterized in that, Includes a fixing plate (500) that connects the support beam (110) and the base frame beam (300) at the rear wheel (220) of the wheelchair, and an off-axis motor (600) mounted on the outside of the fixing plate (500); The eccentric motor (600) includes a reduction section (610) fixed to the fixed plate (500), an output section (620) disposed on one side of the fixed plate (500) of the reduction section (610) and directly connected to the rear wheel (220) in a direct drive, and a drive section (630) disposed offset from the output section (620) and disposed towards the inside of the wheelchair. A wheel arch (K1) is formed at the rear wheel (220) by the support beam (110) and the base frame beam (300) and is divided by the fixing plate (500). The drive unit (630) passes through the wheel arch (K1) and is disposed towards the inside of the wheelchair.

2. The compact electric wheelchair transmission structure as described in claim 1, characterized in that, The reduction section (610) of the eccentric motor (600) is a multi-stage gear transmission structure.

3. The compact electric wheelchair transmission structure as described in claim 2, characterized in that, The multi-stage gear transmission structure is a three-stage gear transmission structure.

4. The compact electric wheelchair transmission structure as described in claim 2, characterized in that, The output section (620) is provided with transmission bearings (621) at both axial ends.

5. The compact electric wheelchair transmission structure as described in claim 1, characterized in that, The support beam (110) and the base frame beam (300) are provided with flanges (510) at the wheel arch ring (K1), and the fixing plate (500) is installed at the flanges (510).

6. The compact electric wheelchair transmission structure as described in claim 5, characterized in that, The fixing plate (500) is installed on the inside of the wheelchair.

7. A wheelchair, characterized in that, The drive unit (630) is provided on both sides of the wheelchair, corresponding to the wheel arch rings (K1) divided by the fixing plate (500), as described in any one of claims 1 to 6.

8. A wheelchair as described in claim 7, characterized in that, The support beam (110) and the underframe beam (300) are provided with support connecting rods (120) on the outer side of the wheel arch ring (K1) facing the front wheel (210).

9. A wheelchair as described in claim 7, characterized in that, The rear end of the underframe beam (300) is provided with an auxiliary wheel (400).

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