A middle shaft transmission device and a scooter

Abstract

The present invention belongs to the technical field of mobility scooters, and discloses a mid-axle transmission device and a mobility scooter, comprising a bracket, a limit seat fixedly provided on one side of the bracket, the limit seat provided with a first through hole; a support seat fixedly provided on the other side of the bracket, the support seat provided with a second through hole; and a core shaft, one end of the core shaft passing through the first through hole and provided with a first crank, the limit seat capable of limiting the axial displacement of the core shaft; the other end of the core shaft passing through the second through hole and provided with a second crank; the core shaft is located between the first crank and the second crank and provided with a chainring; the core shaft can rotate relative to the limit seat and the support seat. The mid-axle transmission device described in the present invention has a simple structure, eliminates the five-way pipe and connecting components on the frame in the prior art, reduces the assembly process, reduces the difficulty of assembly, improves production efficiency, and also reduces the use of raw materials and molding processes, thereby reducing overall costs.

Description

Technical Field

[0001] The present invention relates to the technical field of mobility scooters, and in particular to a mid-axle transmission device and a mobility scooter. Background Art

[0002] The central axis transmission device in a mobility scooter is a key transmission component. Taking an electric vehicle as an example, the main parts of the central axis transmission device of an electric vehicle include the central axis, crank, chainring, and connecting components. In the existing central axis transmission device, the central axis is installed on the five-way bracket of the frame through a connecting component (including a shaft bowl, ball rack, and axle stop), and the chainring is then fixed to the central axis slot position with pins and nuts. Finally, the crank is installed on the square inclined surface at both ends of the central axis with end nuts. After installing the pedals, the vehicle can be ridden. The assembly process of the above-mentioned central axis transmission device is relatively complicated, and it is difficult to install and disassemble, which is not conducive to the assembly and maintenance of the mobility scooter. Summary of the Invention

[0003] An object of the present invention is to provide a mid-axle transmission device and a mobility scooter, which can reduce the types and quantities of parts in the mid-axle transmission device, thereby reducing the number of assembly steps.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A middle shaft transmission device, comprising:

[0006] A bracket, wherein a limit seat is fixedly provided on one side of the bracket, and the limit seat is provided with a first through hole; a support seat is fixedly provided on the other side of the bracket, and the support seat is provided with a second through hole;

[0007] A core shaft, one end of the core shaft is passed through the first through hole and is provided with a first crank, and the limit seat can limit the axial movement of the core shaft; the other end of the core shaft is passed through the second through hole and is provided with a second crank; the core shaft can rotate relative to the limit seat and the support seat; the core shaft is also provided with a chainring, and the chainring is arranged between the first crank and the second crank.

[0008] Preferably, the limiting seat includes two first limiting seats that are interlocked, and the two first limiting seats are arranged to form the first through hole; one of the first limiting seats is fixed to the bracket, and the two first limiting seats are detachably connected.

[0009] Preferably, the core shaft includes a core shaft body and a limiting sleeve arranged on the core shaft body, the limiting sleeve is arranged in the first through hole, and a first clamping protrusion is provided at each of the two axial ends of the limiting sleeve, the two first clamping protrusions are arranged outside the first through hole, and the two first clamping protrusions are respectively abutted against the two axial ends of the limiting seat.

[0010] Preferably, the limiting sleeve includes two first limiting blocks that are interlocked, and the two first limiting blocks are arranged to form a limiting hole, and the core shaft body is passed through the limiting hole; the inner surface of the limiting hole is provided with an annular limiting groove, and the outer peripheral surface of the core shaft body is convexly provided with an annular limiting rib, and the limiting rib is located in the limiting groove.

[0011] Preferably, the limiting hole has a polygonal structure, and the inner surface of the limiting hole includes a plurality of inner side walls that are connected in sequence and end to end, and each of the inner side walls is in line contact with the outer circumference of the core shaft body.

[0012] Preferably, the support seat includes two first support seats that are interlocked, and the two first support seats are arranged to form the second through hole; one of the first support seats is fixed to the bracket, and the two first support seats are detachably connected.

[0013] Preferably, the core shaft also includes a supporting sleeve arranged on the core shaft body, and the supporting sleeve is arranged in the second through hole; a second latching protrusion is provided at each of the two axial ends of the support sleeve, and the two second latching protrusions are arranged outside the second through hole, and the two second latching protrusions are respectively abutted against the two axial ends of the support seat.

[0014] Preferably, the support sleeve includes two first support blocks that are interlocked, and the two first support blocks are arranged to form a support hole, and the core shaft body is passed through the support hole; the support hole has a polygonal structure, and the inner surface of the support hole includes a plurality of inner side walls that are connected in sequence and end to end, and each of the inner side walls is in line contact with the outer peripheral surface of the core shaft body.

[0015] Preferably, the spindle body, the first crank, the second crank and the chainring are integrally arranged.

[0016] A mobility scooter comprises the central shaft transmission device as described in any of the above solutions, and also comprises a frame, wherein the bracket is fixedly connected to the frame.

[0017] Beneficial effects: The present invention provides a mid-axle transmission device and a scooter, the scooter includes a frame, a bracket is fixed on the frame, a limit seat and a support seat are fixed on both sides of the bracket, one end of the core shaft is passed through the first through hole on the limit seat, and is provided with a first crank; the limit seat can limit the axial movement of the core shaft; the other end of the core shaft is passed through the second through hole on the support seat, and is provided with a second crank; the core shaft is also provided with a chainring, and the chainring is arranged between the first crank and the second crank. The above structure enables the core shaft to rotate relative to the limit seat and the support seat without generating axial displacement. The mid-axle transmission device has a simple structure, eliminates the five-way pipe and connecting components on the frame in the prior art, reduces the assembly process, reduces the difficulty of assembly, improves production efficiency, and also reduces the use of raw materials and molding processes, thereby reducing the overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of the central shaft transmission device provided by the present invention;

[0019] Figure 2 is a cross-sectional view of the central shaft transmission device provided by the present invention;

[0020] Figure 3 yes Figure 2 Enlarged view at point A;

[0021] Figure 4 yes Figure 2 Enlarged view at point B;

[0022] Figure 5 It is a schematic diagram of the connection between the limiting hole and the core shaft body in the central shaft transmission device provided by the present invention.

[0023] In the picture:

[0024] 1. Bracket;

[0025] 2. Limit seat; 21. First through hole; 22. First limit seat;

[0026] 3. Support seat; 31. Second through hole; 32. First support seat;

[0027] 4. Mandrel; 41. Mandrel body; 42. Limiting sleeve; 421. First clamping protrusion; 422. First limiting block; 423. Limiting hole; 424. Limiting groove; 43. Supporting sleeve; 431. Second clamping protrusion; 432. First supporting block; 433. Supporting hole; 44. Limiting rib;

[0028] 5. First crank;

[0029] 6. Second crank;

[0030] 7. Chainring. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0032] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0035] The present invention provides a middle shaft transmission device, which can be applied to bicycles, electric vehicles and other commuter vehicles. Figure 1 As shown, Figure 1It is an exploded view of the central axis transmission device provided by the present invention. The central axis transmission device includes a bracket 1, a limit seat 2 is fixedly provided on one side of the bracket 1, and the limit seat 2 is provided with a first through hole 21, preferably, the first through hole 21 is arranged at the center of the limit seat 2; a support seat 3 is fixedly provided on the other side of the bracket 1, and the support seat 3 is provided with a second through hole 31, preferably, the second through hole 31 is arranged at the center of the support seat 3. The central axis transmission device also includes a core shaft 4, one end of the core shaft 4 is passed through the first through hole 21, and a first crank 5 is provided, and the limit seat 2 can limit the axial displacement of the core shaft 4; the other end of the core shaft 4 is passed through the second through hole 31, and a second crank 6 is provided; the core shaft 4 is also provided with a toothed disc 7, and the toothed disc 7 is arranged between the first crank 5 and the second crank 6. The above structure enables the core shaft 4 to rotate relative to the limit seat 2 and the support seat 3 without generating axial displacement. In this embodiment, the chainring 7 is located between the limit seat 2 and the support seat 3. In other embodiments, the position of the chainring 7 can also be set between the first crank 5 and the limit seat 2, or between the second crank 6 and the support seat 3. The specific position depends on the overall design of the mobility scooter.

[0036] The center axle transmission device provided in this embodiment eliminates the prior art bottom bracket tube and connecting components on the frame, thereby reducing assembly steps, lowering assembly difficulty, and improving production efficiency. It also reduces the use of raw materials and molding processes, reducing overall costs. Furthermore, in the prior art, the spindle rotates via the frame's bottom bracket, with the support point located in the middle of the spindle. This embodiment, however, provides two support points, located near each end of the spindle, eliminating the need for machining the bottom bracket and reducing manufacturing difficulty.

[0037] Figure 2 : is a cross-sectional view of the central shaft transmission device provided by the present invention. Figure 2 As shown, the limit seat 2 includes two interlocking first limit seats 22, and the two first limit seats 22 are arranged to form a first through hole 21; one of the first limit seats 22 is fixedly connected to the bracket 1, and the two first limit seats 22 are detachably connected. Preferably, the support seat 3 includes two interlocking first support seats 32, and the two first support seats 32 are arranged to form a second through hole 31; one of the first support seats 32 is fixedly connected to the bracket 1, and the two first support seats 32 are detachably connected. Specifically, the connecting member connecting the two first limit seats 22 and the two first support seats 32 can be a bolt.

[0038] Optionally, the core shaft 4 includes a core shaft body 41 and a limiting sleeve 42 and a supporting sleeve 43 provided at both ends of the core shaft body 41, wherein the limiting sleeve 42 is provided in the first through hole 21, and the supporting sleeve 43 is provided in the second through hole 31. Specifically, in this embodiment, the core shaft body 41, the limiting sleeve 42, and the supporting sleeve 43 are provided separately. In other embodiments, the core shaft body 41, the limiting sleeve 42, and the supporting sleeve 43 can also be provided as an integrated body.

[0039] Figure 3 yes Figure 2 A magnified view at point A. Figure 3 As shown, a first latching protrusion 421 is provided at each axial end of the limiting sleeve 42. The two first latching protrusions 421 are disposed outside the first through hole 21 and abut against the two axial ends of the limiting seat 2, respectively. The two first latching protrusions 421 restrict the axial movement of the limiting sleeve 42 relative to the limiting seat 2, allowing the limiting sleeve 42 to rotate relative to the limiting seat 2 within the first through hole 21 without generating axial displacement. Furthermore, the limiting sleeve 42 includes two first limit blocks 422, which are buckled onto the core shaft body 41 and surround a limiting hole 423. The inner surface of the limiting hole 423 is provided with an annular limiting groove 424. Specifically, the limiting groove 424 is composed of two semi-annular grooves. Each first limit block 422 is provided with a semi-annular groove, and the two ends of the two semi-annular grooves are respectively connected. Correspondingly, an annular limiting rib 44 is convexly provided on the outer circumference of the core shaft body 41 , and the limiting rib 44 is located in the limiting groove 424 . The above structure can limit the axial displacement of the core shaft body 41 relative to the limiting sleeve 42 .

[0040] Figure 4 yes Figure 2 Magnified view at B. Further reference Figure 4 The support sleeve 43 is provided with second latching protrusions 431 at both axial ends. The two second latching protrusions 431 are disposed outside the second through hole 31 and abut against the two axial ends of the support base 3. The two second latching protrusions 431 limit the axial movement of the support sleeve 43 relative to the support base 3, allowing the support sleeve 43 to rotate relative to the support base 3 within the second through hole 31 without axial displacement.

[0041] Optionally, the support sleeve 43 includes two first support blocks 432, the two first support blocks 432 are buckled on the core shaft body 41, and the two first support blocks 432 are arranged to form a support hole 433. In other embodiments, the support sleeve 43 can also be set as an integrated structure. Specifically, a support hole 433 is provided at the center of the support sleeve 43, and a second latching protrusion 431 is provided at one end of the support sleeve 43 axially close to the limit seat 2, and the axial ends of the second latching protrusion 431 are respectively abutted against the support seat 3 and the core shaft body 41, so that the support sleeve 43 can rotate relative to the support seat 3 in the second through hole 31 without generating axial displacement. In addition, the support seat 3 can also be set as an integrated structure. At this time, in order to be able to normally install the support sleeve 43 to the second through hole 31 of the support seat 3, the second latching protrusion 431 is not provided on the support sleeve 43, and the two ends of the support sleeve 43 can abut against the retaining spring fixed to the core shaft body 41.

[0042] This structure allows spindle 4 to rotate relative to the stopper seat 2 and support seat 3 during riding without axial displacement. This prevents axial displacement of the chainring mounted on the spindle, ensuring that the chainring and the flywheel connected to the chainring are aligned, preventing the chain from loosening. Furthermore, the stopper sleeve 42 and support sleeve 43 function as self-lubricating bearings, reducing transmission friction generated by spindle body 41 during riding and improving transmission efficiency.

[0043] Figure 5 Schematic diagram of the connection between the limiting hole 423 and the core shaft body 41 in the middle shaft transmission device provided by the present invention. Figure 5 As shown, the limiting hole 423 is a polygonal structure, and the inner surface of the limiting hole 423 includes a plurality of inner side walls connected in sequence and end to end, and each inner side wall is in line contact with the outer peripheral surface of the core shaft body 41. This arrangement can reduce the contact area between the core shaft body 41 and the limiting sleeve 42 while maintaining the stable rotation of the core shaft body 41, thereby further reducing the transmission friction and improving the transmission efficiency. Similarly, the support hole 433 at the support sleeve 43 is also arranged in a polygonal structure, and the inner surface of the support hole 433 includes a plurality of inner side walls connected in sequence and end to end, and each inner side wall is in line contact with the outer peripheral surface of the core shaft body 41. In this embodiment, the limiting hole 423 and the support hole 433 are arranged in a quadrilateral structure. In other embodiments, the limiting hole 423 and the support hole 433 can also be arranged as polygons such as pentagons and hexagons, which are not limited here.

[0044] Furthermore, in order to reduce the types of parts, improve the utilization rate of parts, and simplify the production process of parts, the limiting seat 2 can be used instead of the supporting seat 3, and correspondingly, the limiting shaft sleeve 42 can be used instead of the supporting shaft sleeve 43.

[0045] In this embodiment, the spindle body 41, the first crank 5, the second crank 6 and the chainring 7 are integrally arranged, which can further reduce the number of connectors used during assembly and simplify the assembly process. During installation, a limiting sleeve 42 and a supporting sleeve 43 are placed at both ends of the spindle body 41, and the limiting sleeve 42 and the supporting sleeve 43 are placed on the first limiting seat 22 and the first supporting seat 32 fixed to the bracket 1 respectively; finally, the other first limiting seat 22 is assembled with the first limiting seat 22 fixed to the bracket 1, and the other first supporting seat 32 is assembled with the first supporting seat 32 fixed to the bracket 1 to complete the overall assembly. Optionally, in other embodiments, the spindle body 41, the first crank 5, the chainring 7 and the second crank 6 can be set as a split structure. In the early stage of assembly, the spindle body 41, the first crank 5, the chainring 7 and the second crank 6 are assembled into one piece through connectors and then installed to the bracket 1. In addition, the spindle body 41, the first crank 5, the second crank 6 and the chainring 7 can be combined with each other and set as an integral whole. For example, the spindle body 41 and the chainring 7 can be set as an integral whole, or the spindle body 41, the first crank 5 and the chainring 7 can be set as an integral whole.

[0046] The present invention further provides a mobility scooter, comprising the above-mentioned central axis transmission device for a mobility scooter. The mobility scooter also comprises a frame, and the bracket 1 in the above-mentioned central axis transmission device is fixedly connected to the frame.

[0047] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A middle shaft transmission device, characterized in that: include: A bracket (1), wherein a limiting seat (2) is fixedly provided on one side of the bracket (1), and the limiting seat (2) is provided with a first through hole (21); a supporting seat (3) is fixedly provided on the other side of the bracket (1), and the supporting seat (3) is provided with a second through hole (31); A core shaft (4), one end of the core shaft (4) is passed through the first through hole (21) and is provided with a first crank (5), and the limit seat (2) is capable of limiting the axial movement of the core shaft (4); the other end of the core shaft (4) is passed through the second through hole (31) and is provided with a second crank (6); the core shaft (4) is capable of rotating relative to the limit seat (2) and the support seat (3); the core shaft (4) is also provided with a toothed disc (7), and the toothed disc (7) is provided between the first crank (5) and the second crank (6); The limiting seat (2) comprises two first limiting seats (22) that are buckled together, and the two first limiting seats (22) are arranged to surround the first through hole (21); one of the first limiting seats (22) is fixed to the bracket (1), and the two first limiting seats (22) are detachably connected; The support seat (3) comprises two first support seats (32) that are buckled together, and the two first support seats (32) are arranged to form the second through hole (31); one of the first support seats (32) is fixed to the bracket (1), and the two first support seats (32) are detachably connected; The core shaft (4) includes a core shaft body (41) and a limiting sleeve (42) arranged on the core shaft body (41), the limiting sleeve (42) is arranged in the first through hole (21), and a first clamping protrusion (421) is provided at each of the two axial ends of the limiting sleeve (42), the two first clamping protrusions (421) are arranged outside the first through hole (21), and the two first clamping protrusions (421) are respectively in contact with the two axial ends of the limiting seat (2). The limiting sleeve (42) includes two first limiting blocks (422) that are interlocked, and the two first limiting blocks (422) are arranged to form a limiting hole (423), and the core shaft body is passed through the limiting hole (423); the inner surface of the limiting hole (423) is provided with an annular limiting groove (424), and the outer peripheral surface of the core shaft body (41) is convexly provided with an annular limiting rib (44), and the limiting rib (44) is located in the limiting groove (424).

2. The middle shaft transmission device according to claim 1, characterized in that: The limiting hole (423) has a polygonal structure, and the inner surface of the limiting hole (423) includes a plurality of inner side walls that are connected in sequence and end to end, and each of the inner side walls is in line contact with the outer peripheral surface of the core shaft body (41).

3. The middle shaft transmission device according to claim 1, characterized in that: The core shaft (4) further comprises a support sleeve (43) arranged on the core shaft body (41), and the support sleeve (43) is arranged in the second through hole (31); a second latching protrusion (431) is provided at each of the two axial ends of the support sleeve (43), the two second latching protrusions (431) are arranged outside the second through hole (31), and the two second latching protrusions (431) respectively abut against the two axial ends of the support seat (3).

4. The middle shaft transmission device according to claim 3, characterized in that: The support sleeve (43) includes two first support blocks (432) that are interlocked, and the two first support blocks (432) are arranged to form a support hole (433), and the core shaft body is passed through the support hole (433); the support hole (433) is a polygonal structure, and the inner surface of the support hole (433) includes a plurality of inner side walls that are connected in sequence and end to end, and each of the inner side walls is in line contact with the outer peripheral surface of the core shaft body (41).

5. The middle shaft transmission device according to claim 1, characterized in that: The spindle body (41), the first crank (5), the second crank (6) and the chainring (7) are integrally arranged.

6. A mobility scooter, characterized in that: It comprises the middle shaft transmission device according to any one of claims 1 to 5, and also comprises a frame, and the bracket (1) is fixedly connected to the frame.

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