Electric skateboard bridge assembly

Abstract

The present invention belongs to the technical field of electric skateboards, and relates to a bridge assembly of an electric skateboard. It solves the technical problem in the prior art that electric skateboards cannot replace skateboard wheels of different sizes. It includes a bridge, and symmetrically arranged hub mounting parts are respectively provided on both sides of the bridge, and each hub mounting part is detachably mounted with a small wheel or a large wheel that can be replaced with each other, and two symmetrically arranged motor brackets are fixed on the bridge, one end of the motor bracket is fixed on the bridge, and the other end extends outward in a cantilevered manner, and a motor is fixed to the end of the motor bracket extending outward, and when a small wheel is installed on the hub mounting part, the motor bracket has a sufficient height from the ground to avoid the motor from being hit. Compared with the prior art, the advantage of the present invention is that skateboard wheels of different sizes can be selected and replaced according to road conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of electric skateboards, and in particular relates to a bridge assembly of an electric skateboard. Background Art

[0002] The wheel size, hardness and other properties of electric skateboards produce different experiences for users when using skateboards. During use, you may be in different road conditions. When using electric skateboards on different road conditions, you need to match skateboard wheels of different sizes to obtain adaptive performance. For example, 38-40mm wheels are less used. Due to their small size, the wheels start and accelerate quickly, but the stamina is small, which is suitable for very flat roads; 45mm-50mm wheels are the most suitable skateboard wheels for road-type skateboards; 52-60mm skateboard wheels are more suitable for use on props. Although the starting speed is slow, it can bring enough power to users; in the wild, off-road wheels above 60mm are more suitable, and professional mountain skateboards use large rubber wheels. However, in the prior art, large wheels and small wheels are difficult to replace. In addition, even if they can be replaced, it is easy to put higher requirements on the installation of the motor because the diameter of the small wheel is too small. The reason is that when using small wheels, motors and other components are easily bumped, especially when used on uneven roads. Summary of the invention

[0003] The object of the present invention is to provide a bridge assembly for an electric skateboard in view of the above problems.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: the bridge assembly of the electric skateboard includes a bridge, and symmetrically arranged wheel hub mounting parts are respectively provided on both sides of the bridge, and each wheel hub mounting part is detachably mounted with a small wheel or a large wheel that can be replaced by each other, and two symmetrically arranged motor brackets are fixed on the bridge, one end of the motor bracket is fixed on the bridge, and the other end extends outward in a cantilevered manner, and a motor is fixed to the end of the motor bracket extending outward, and the motor and the small wheel on the same side of the bridge are connected by a transmission mechanism or the motor and the large wheel on the same side of the bridge are connected by a transmission mechanism, and when the small wheel is installed on the wheel hub mounting part, the motor bracket has a sufficient height from the ground to avoid the motor from being hit.

[0005] In the above-mentioned bridge assembly of the electric skateboard, the transmission mechanism includes a driving wheel arranged on the power shaft of the motor, a small wheel transmission wheel arranged on the small wheel and a large wheel transmission wheel arranged on the large wheel. The small wheel and the small wheel transmission wheel are detachably connected or connected as an integrated structure, and the large wheel and the large wheel transmission wheel are detachably connected or connected as an integrated structure. The driving wheel and the small wheel transmission wheel located on the same side of the bridge are connected by a small ring transmission belt, or the driving wheel and the large wheel transmission wheel located on the same side of the bridge are connected by a large ring transmission belt.

[0006] In the above-mentioned bridge assembly of the electric skateboard, a plurality of transmission columns distributed in the circumferential direction are provided on the outer side of the small wheel transmission wheel, and a plurality of transmission holes distributed in the circumferential direction are provided on the small wheel, and the transmission columns correspond to the transmission holes one by one and the transmission columns are inserted into the transmission holes; the large wheel includes an outer wheel hub and an inner wheel hub, and the outer wheel hub and the inner wheel hub are respectively provided with corresponding positioning holes, and positioning bolts are passed through the corresponding positioning holes to fix the outer wheel hub and the inner wheel hub together, and the inner wheel hub and the large wheel transmission wheel are detachably fixed or connected as an integrated structure.

[0007] In the above-mentioned bridge assembly of the electric skateboard, the small wheel transmission wheel is cylindrical and a small gear ring is arranged on the periphery of the small wheel transmission wheel, the large wheel transmission wheel is cylindrical and a large gear ring is arranged on the periphery of the large wheel transmission wheel, the driving wheel is a gear, and the small annular transmission belt and the large annular transmission belt are respectively internal tooth transmission belts; the outer diameter of the small wheel transmission wheel is smaller than the inner diameter of the large wheel transmission wheel.

[0008] In the above-mentioned bridge assembly of the electric skateboard, when the small wheel is detached from the wheel hub mounting portion, the small wheel transmission wheel is detached from the wheel hub mounting portion together with the small wheel, or the small wheel transmission wheel is retained on the wheel hub mounting portion; when the large wheel is detached from the wheel hub mounting portion, the large wheel transmission wheel is detached from the wheel hub mounting portion together with the large wheel, or the large wheel transmission wheel is retained on the wheel hub mounting portion; at least one small wheel bearing is provided between the small wheel and the wheel hub mounting portion, and the small wheel bearing is fixed on the small wheel; at least one large wheel bearing is provided between the large wheel and the wheel hub mounting portion, and the large wheel bearing is fixed on the large wheel; a stop nut is provided at the outer end of the wheel hub mounting portion.

[0009] In the bridge frame assembly of the above-mentioned electric skateboard, the motor bracket is a long flat structure, a through hole is provided at one end of the motor bracket and the through hole is penetrated and fixedly connected with the bridge frame; at least two extension parts extending axially along the hub mounting part are provided on one side of the through hole, and the extension parts are tile-shaped and the inner walls are fitted to the outer surface of the bridge frame; a first annular step is provided on the bridge frame, and a second annular step is provided in the through hole, and the first annular step and the second annular step are matched with each other.

[0010] In the bridge assembly of the above-mentioned electric skateboard, the motor is arranged horizontally, the power shaft of the motor passes from one side of the motor bracket to the other side of the motor bracket, a power bearing is provided between the power shaft and the motor bracket, and the driving wheel is provided at the outer end of the power shaft.

[0011] In the above-mentioned bridge assembly of the electric skateboard, a recessed area is provided on one side of the motor bracket on which the motor is mounted, one end of the motor is located in the recessed area, and the motor is fixed to the motor bracket by a plurality of fastening screws; a surrounding edge is provided on the other side of the motor bracket around the transmission mechanism; a protective cover is fixed on the surrounding edge so that the transmission structure is protected; the motor bracket is arranged parallel to the horizontal plane or arranged to be inclined upward outward from the motor bracket.

[0012] In the bridge frame assembly of the above-mentioned electric skateboard, an inclined mounting arm is provided in the middle of the bridge frame, a mounting seat is provided above the mounting arm, the top of the mounting seat has a horizontally arranged mounting surface, the mounting arm and the mounting seat are connected by an inclined shock-absorbing connecting assembly, and the inclination direction of the mounting arm is opposite to the inclination direction of the shock-absorbing connecting assembly.

[0013] In the above-mentioned bridge assembly of the electric skateboard, a receiving hole located on the mounting seat and inclined is provided below the mounting surface, and the upper end of the mounting arm is located in the receiving hole; the upper end of the mounting arm is columnar, and a gap is left between the upper end of the mounting arm and the bottom of the receiving hole, and / or a gap is left between the side of the mounting arm and the wall of the receiving hole; the upper end of the mounting arm has a smooth surface, and / or the bottom of the receiving hole has a smooth surface.

[0014] In the above-mentioned bridge assembly of the electric skateboard, the part below the upper end of the mounting arm is flat and its width gradually increases from the upper end to the lower end; the shock-absorbing connection assembly includes a first clamp, a second clamp and a connecting bolt, the first clamp is located on one side of the mounting arm and between the mounting seat and the mounting arm, the second clamp is located on the other side of the mounting arm, the connecting bolt is passed through the mounting seat, the first clamp, the mounting arm and the second clamp, and the connecting bolt fastens the mounting seat, the first clamp, the mounting arm and the second clamp through a fastening structure.

[0015] In the above-mentioned bridge assembly of the electric skateboard, the connecting bolt is a bolt, one end of the bolt is provided with a boss, and the other end is threadedly connected with a nut, the boss and the nut clamp the mounting seat, the first clamp, the mounting arm and the second clamp, and the first clamp and the second clamp are made of shock-absorbing material.

[0016] In the above-mentioned bridge frame assembly of the electric skateboard, a first clamping body is provided with a first clamping support at one end close to the mounting seat, and a second clamping body is provided with a second clamping support at one end away from the mounting arm. The first clamping support has a first surrounding edge arranged around the first clamping body, and the second clamping support has a second surrounding edge arranged around the second clamping body.

[0017] In the above-mentioned bridge frame assembly of the electric skateboard, the mounting seat includes a high portion and a low portion, the high portion and the low portion are connected as a whole and the outer ends of the high portion and the low portion are forked, the connection between the high portion and the low portion is an arc-shaped transition, the accommodating hole is arranged in the high portion, and the shock-absorbing connecting assembly is passed through the low portion.

[0018] Compared with the existing technology, the advantages of the bridge assembly of the electric skateboard are:

[0019] 1. The user can replace the large wheel and the small wheel according to different usage scenarios to improve the adaptability of the electric skateboard to the usage scenarios, so as to improve the actual performance of the electric skateboard, and when the small wheel is installed on the wheel hub mounting part, the motor bracket has a sufficient height from the ground to avoid the motor from being hit.

[0020] 2. The motor bracket is fixedly installed on the bridge frame to avoid contact with the skateboard pedal, so as to avoid deformation of the skateboard pedal due to external force during use, which affects the transmission accuracy and service life of the transmission structure. The structure is simple and the production cost is low.

[0021] 3. The inclination direction of the mounting arm is opposite to the inclination direction of the shock-absorbing connecting assembly. During the sliding process of the electric skateboard, it can effectively absorb horizontal and vertical vibrations, greatly improve the shock absorption effect, and improve comfort and safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram provided by the present invention.

[0023] Figure 2 It is an exploded diagram provided by the present invention.

[0024] Figure 3 It is a cross-sectional view of the installation of the large wheel driving wheel provided by the present invention.

[0025] Figure 4 It is a cross-sectional view of the installation of the small wheel driving wheel provided by the present invention.

[0026] Figure 5 It is a schematic diagram of the motor bracket structure provided by the present invention.

[0027] Figure 6 The present invention provides Figure 5 Sectional view at point A.

[0028] Figure 7 It is an exploded view of the shock absorbing connection assembly provided by the present invention.

[0029] Figure 8 It is a cross-sectional view of the shock-absorbing connection assembly provided by the present invention.

[0030] In the figure, the bridge frame 1, the hub mounting part 2, the small wheel 3, the large wheel 4, the motor bracket 5, the motor 6, the driving wheel 7, the small wheel transmission wheel 8, the large wheel transmission wheel 9, the small annular transmission belt 10, the large annular transmission belt 11, the transmission column 12, the transmission hole 13, the outer wheel hub 14, the inner wheel hub 15, the positioning hole 16, the small gear ring 17, the large gear ring 18, the small wheel bearing 19, the large wheel bearing 20, the stop nut 21, the through hole 22, the extension part 23, the first annular step 24, the second annular step 25, the dynamic bearing 26, the recessed area 27, the fastening screw 28, the surrounding edge 29, the cover 30, the mounting arm 31, the mounting seat 32, the mounting surface 33, the shock absorbing connecting assembly 34, the accommodating hole 35, the first clamp body 36, the second clamp body 37, the connecting bolt 38, the protrusion 39, the nut 40, the first clamp support 41, the second clamp support 42, the high part 43, and the low part 44. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, the bridge assembly of the electric skateboard includes a bridge 1, symmetrically arranged wheel hub mounting parts 2 are respectively provided on both sides of the bridge 1, and each wheel hub mounting part 2 is detachably mounted with a small wheel 3 or a large wheel 4 that can be replaced by each other, and two symmetrically arranged motor brackets 5 are fixed on the bridge 1, one end of the motor bracket 5 is fixed on the bridge 1, and the other end extends outward in a cantilevered manner, and a motor 6 is fixed to the end of the motor bracket 5 extending outward, and the motor 6 and the small wheel 3 on the same side of the bridge 1 are connected through a transmission mechanism or the motor 6 and the large wheel 4 on the same side of the bridge 1 are connected through a transmission mechanism, and when the small wheel 3 is installed on the wheel hub mounting part 2, the motor bracket 5 has a sufficient height from the ground to avoid the motor 6 from being hit.

[0033] According to the use environment, a large wheel 4 or a small wheel 3 is selected, the small wheel 3 or the large wheel 4 originally installed on the hub mounting part 3 is detached, and then the large wheel 4 or the small wheel 3 is installed on the hub mounting part 3 and connected to the motor 6 located on the same side of the bridge frame 1 through the transmission mechanism, which greatly improves the adaptability of the electric skateboard to the use environment, improves the use performance of the electric skateboard, and is easy to disassemble and assemble, and has strong operability. The two motor brackets 5 are respectively fixed with motors 6, and the two motors 6 respectively control the two large wheels 4 or two small wheels 3 connected in the corresponding transmission, and the two large wheels 4 or two small wheels 3 are independently controlled.

[0034] One end of the motor bracket 5 extends in a cantilevered manner, and the other end is fixedly mounted on the bridge frame 1 to avoid contact with the skateboard pedal. This prevents the skateboard pedal from being deformed by external forces during use, which affects the relative position between the motor 6 and the large wheel 4 or the small wheel 3, thereby affecting the transmission accuracy and service life of the transmission structure.

[0035] Specifically, the transmission mechanism includes a driving wheel 7 arranged on the power shaft of the motor 6, a small wheel transmission wheel 8 arranged on the small wheel 3, and a large wheel transmission wheel 9 arranged on the large wheel 4. In this embodiment, the small wheel 3 and the small wheel transmission wheel 8 are detachably connected or connected as an integrated structure, and the large wheel 4 and the large wheel transmission wheel 9 are detachably connected or connected as an integrated structure. The driving wheel 7 and the small wheel transmission wheel 8 on the same side of the bridge 1 are connected through a small annular transmission belt 10, or the driving wheel 7 and the large wheel transmission wheel 9 on the same side of the bridge 1 are connected through a large annular transmission belt 11. The large wheel transmission wheel 9 and the small wheel transmission wheel 8 change the corresponding transmission ratio of the large wheel 4 and the small wheel 3 at the same motor output power, ensuring that the large wheel 4 and the small wheel 3 obtain substantially the same linear speed when driven by the motor 6, ensuring that the user can adapt to and control the electric skateboard more easily.

[0036] Furthermore, the small wheel transmission wheel 8 is cylindrical and a small gear ring 17 is arranged on the periphery of the small wheel transmission wheel 8, the large wheel transmission wheel 9 is cylindrical and a large gear ring 18 is arranged on the periphery of the large wheel transmission wheel 9, the driving wheel 7 is a gear, and the small annular transmission belt 10 and the large annular transmission belt 11 are respectively internal gear transmission belts; the outer diameter of the small wheel transmission wheel 8 is smaller than the inner diameter of the large wheel transmission wheel 9. The transmission ratio between the motor 6 and the small wheel transmission wheel 8 is greater than the transmission ratio between the motor 6 and the large wheel transmission wheel 9. Under the same output power of the motor, the linear velocity difference between the small wheel 3 and the large wheel 4 is reduced, ensuring that the large wheel 4 and the small wheel 3 obtain substantially the same linear velocity when driven by the motor, ensuring that the user can more easily adapt to and control the electric skateboard. At the same time, the angular velocity of the large wheel 4 is reduced, so that the torque obtained by the large wheel 4 is greater than that of the small wheel 3, so that the electric skateboard has stronger power on uneven roads.

[0037] Preferably, a plurality of transmission columns 12 distributed in the circumferential direction are provided on the outer side of the small wheel transmission wheel 8, and a plurality of transmission holes 13 distributed in the circumferential direction are provided on the small wheel 3, and the transmission columns 12 correspond to the transmission holes 13 one by one and the transmission columns 12 are inserted into the transmission holes 13; the small wheel transmission wheel 8 and the small wheel 3 are plugged and fixed by the transmission columns 12 and the transmission holes 13, so as to limit the relative rotation between the small wheel transmission wheel 8 and the small wheel 3 and realize the effective transmission between the small wheel transmission wheel 8 and the small wheel 3.

[0038] Further, the large wheel 4 includes an outer wheel hub 14 and an inner wheel hub 15, and the outer wheel hub 14 and the inner wheel hub 15 are respectively provided with corresponding positioning holes 16, and positioning bolts are penetrated in the corresponding positioning holes 16 to fix the outer wheel hub 14 and the inner wheel hub 15. In order to adapt to uneven road conditions, in this embodiment, the outer wheel hub 14 and the inner wheel hub 15 are respectively provided with a first limiting step and a second limiting step, and a large wheel rim is sandwiched between the first limiting step and the second limiting step, and the large wheel rim is made of elastic rubber. In this embodiment, the inner wheel hub 15 and the large wheel transmission wheel 9 are connected as an integrated structure, and those skilled in the art can also connect the inner wheel hub 15 and the large wheel transmission wheel 9 in a detachable fixed manner.

[0039] In this embodiment, when the small wheel 3 is separated from the wheel hub mounting portion 2, the small wheel transmission wheel 8 is separated from the wheel hub mounting portion 2 together with the small wheel 3, or the small wheel transmission wheel 8 is retained on the wheel hub mounting portion 2; when the large wheel 4 is separated from the wheel hub mounting portion 2, the large wheel transmission wheel 9 is separated from the wheel hub mounting portion 2 together with the large wheel 4, or the large wheel transmission wheel 9 is retained on the wheel hub mounting portion 2. When replacing the large wheel 4 or the small wheel 3, the large wheel 4 together with the large wheel transmission wheel 9 or the small wheel 3 together with the small wheel transmission wheel 8 can be removed from the wheel hub mounting portion 2. After being removed from the wheel hub mounting portion 2, the large wheel 4 and the large wheel transmission wheel 9 or the small wheel 3 and the small wheel transmission wheel 8 are always connected, which is convenient for installation when the large wheel 4 or the small wheel 3 is replaced next time, simplifies the installation process, and improves the installation and replacement efficiency. In this embodiment, when the small wheel 3 is separated from the wheel hub mounting portion 2, the small wheel transmission wheel 8 is separated from the wheel hub mounting portion 2 together with the small wheel 3, and when the large wheel 4 is separated from the wheel hub mounting portion 2, the large wheel transmission wheel 10 is separated from the wheel hub mounting shaft 3 together with the large wheel hub 5, which is convenient for installation and reduces the number of installation steps. The user can also keep the small wheel transmission wheel 9 on the wheel hub mounting shaft 3 after removing the small wheel hub 4, and keep the large wheel transmission wheel 10 on the wheel hub mounting shaft 3 when removing the large wheel hub 5.

[0040] At least one small wheel bearing 19 is provided between the small wheel 3 and the wheel hub mounting portion 2, and the small wheel bearing 19 is fixed on the small wheel 3; at least one large wheel bearing 20 is provided between the large wheel 4 and the wheel hub mounting portion 2, and the large wheel bearing 20 is fixed on the large wheel 4; a stop nut 21 is provided at the outer end of the wheel hub mounting portion 2. The inner ring hole diameter of the large wheel bearing 20 is the same as the inner ring hole diameter of the small wheel bearing 19, and the wheel hub mounting portion 2 is a smooth axis, so that the wheel hub mounting portion 2 can ensure that the large wheel 4 and the small wheel 3 are adapted, and ensure that the large wheel 4 and the small wheel 3 are smoothly installed on the wheel hub mounting portion 2 when the large wheel 4 and the small wheel 3 are disassembled.

[0041] Preferably, the motor bracket 5 is a long flat structure, and a through hole 22 is provided at one end of the motor bracket 5, and the through hole 22 is fixedly connected to the bridge frame 1. During the installation process, after the hub mounting part 2 passes through the through hole 22, the motor bracket 5 is fixed on the hub mounting part 2, so that the motor bracket 5 is positioned. The plane where the flat direction of the motor bracket 5 is located is perpendicular to the axial direction of the hub mounting part 2, and the motor 6 can be fixed on the motor bracket 5 at the end so that the power shaft of the motor 6 is parallel to the axial direction of the hub mounting part 2. More preferably, in this embodiment, the end of the motor 6 close to the power shaft is fixedly connected to the motor bracket 5, which further reduces the jitter of the output end of the motor 6 and improves the accuracy of the motor output transmission.

[0042] Furthermore, at least two extensions 23 extending axially along the hub mounting portion 2 are provided on one side of the through hole 22. The extensions 23 are tile-shaped and the inner walls are fitted to the outer surface of the bridge 1. The extensions 23 increase the contact area between the motor bracket 5 and the hub mounting portion 2, further reducing the risk of the motor bracket 5 shaking or twisting under the action of external forces, ensuring the position stability of the motor 6 during use, and removing the adverse factors affecting the output accuracy of the motor 6. A first annular step 24 is provided on the bridge 1, and a second annular step 25 is provided in the through hole 22. The first annular step 24 and the second annular step 25 are matched with each other. Through the mutual cooperation of the first annular platform 24 and the second annular platform 25, the motor bracket 5 is further limited, so that the motor bracket 5 has effective limits at both ends along the axial direction of the bridge 1 to prevent the motor bracket 5 from rotating under force.

[0043] The motor 6 is arranged horizontally, and the power shaft of the motor 6 passes from one side of the motor bracket 5 to the other side of the motor bracket 5. A power bearing 26 is provided between the power shaft and the motor bracket 5, and the driving wheel 7 is provided at the outer end of the power shaft. The central axis of the power shaft and the central axis of the hub mounting portion 2 are arranged parallel to each other. In this embodiment, two motors 6 are located between two motor brackets 5. The horizontal arrangement of the motor 6 makes the power shaft of the motor 6 horizontal with the central axis of the bridge 1, and the transmission structure omits the transmission reversing mechanism, making the transmission structure simpler and more compact, reducing the energy loss and volume occupied by the transmission structure.

[0044] A recessed area 27 is provided on one side of the motor bracket 5 where the motor 6 is mounted. One end of the motor 6 is located in the recessed area 27. The motor 6 is fixed to the motor bracket 5 by a plurality of fastening screws 28. The side wall of the recessed area 27 contacts the outer wall of the motor 6 to limit the movement of the motor 6, and is further fastened to the motor bracket 5 by fastening screws. A peripheral edge 29 is provided on the other side of the motor bracket 5 around the transmission mechanism. A protective cover 30 is fixed on the peripheral edge 29 to protect the transmission structure and prevent external dust, stones, and splashing water from entering the transmission structure and causing damage to the transmission structure. The motor bracket 5 is arranged parallel to the horizontal plane or tilted upward from the motor bracket 5 to increase the distance between the motor 6 and the ground and reduce the probability of collision with protrusions on the ground during operation.

[0045] An inclined mounting arm 31 is provided in the middle of the bridge frame 1, and a mounting seat 32 is provided above the mounting arm 31. The top of the mounting seat 32 has a horizontally arranged mounting surface 33. The mounting arm 31 and the mounting seat 32 are connected by an inclined shock-absorbing connecting component 34, and the inclination direction of the mounting arm 31 is opposite to the inclination direction of the shock-absorbing connecting component 34. During the gliding process of the electric skateboard, the large wheel 4 or the small wheel 3 is subjected to a reaction force with vertical and horizontal components when encountering an obstacle, which makes the electric skateboard tend to be bumpy. The reaction force exerted on the large wheel 4 or the small wheel 3 is transmitted to the shock-absorbing connection assembly 34 through the bridge frame 1 and the mounting arm 31. Since the inclination direction of the shock-absorbing connection assembly 34 is opposite to the inclination direction of the mounting arm 31, the force exerted by the mounting arm 31 on the shock-absorbing connection assembly 34 is consistent with the inclination direction of the shock-absorbing connection assembly 34. The shock-absorbing connection assembly 34 is squeezed to effectively absorb the force exerted by the mounting arm 31, and the vertical and horizontal components of the force are weakened and transmitted to the mounting seat to resist the force exerted by the user on the skateboard pedal, thereby reducing the vibration of the skateboard pedal in the vertical and horizontal directions.

[0046] Preferably, a receiving hole 35 is provided below the mounting surface 33 and is located on the mounting seat 32 and is obliquely arranged. The upper end of the mounting arm 31 is located in the receiving hole 35. The receiving hole 35 limits the range of movement of the mounting arm 31 and limits the extreme position of the mounting arm 31 during the shock absorption process, thereby preventing the shock absorbing connecting assembly 34 from being damaged by being squeezed by a huge external force, and extending the service life of the shock absorbing connecting assembly 34. The upper end of the mounting arm 31 is a columnar body, and there is a gap between the upper end of the mounting arm 31 and the bottom of the receiving hole 35, and there is a gap between the side of the mounting arm 31 and the hole wall of the receiving hole 35. There is a gap between the receiving hole 35 and the mounting arm 31, so as to ensure that the mounting seat 32 has room for movement when vibrated, thereby achieving effective shock absorption. The upper end of the mounting arm 31 has a smooth surface, and the bottom of the receiving hole 35 has a smooth surface, so as to avoid stress concentration and improve strength. The portion below the upper end of the mounting arm 31 is flat and its width gradually increases from the upper end to the lower end; thereby improving the connection strength between the mounting arm 31 and the bridge frame 1, avoiding deformation of the connection between the mounting arm 31 and the bridge frame 1 after being subjected to external force, and increasing the distance between the ground and the skateboard pedal, thus affecting the overall structure of the electric skateboard, especially the height of the skateboard pedal from the ground.

[0047] Preferably, the shock-absorbing connection assembly 34 includes a first clamp 36, a second clamp 37 and a connecting bolt 38, wherein the first clamp 36 is located on one side of the mounting arm 31 and between the mounting seat 32 and the mounting arm 31, the second clamp 37 is located on the other side of the mounting arm 31, and the connecting bolt 38 is passed through the mounting seat 32, the first clamp 36, the mounting arm 31 and the second clamp 37, and the connecting bolt 38 fastens the mounting seat 32, the first clamp 36, the mounting arm 31 and the second clamp 37 through a fastening structure. The first clamp 36 and the second frame 37 clamp the mounting arm 31 to achieve a fixed connection between the mounting arm 31 and the mounting seat 32.

[0048] When the skateboard wheel encounters an obstacle, the mounting arm 31 transmits the force exerted on the large wheel 4 or the small wheel 3 to the first clamp 36, and the first clamp 36 and the second clamp 37 are deformed under pressure to completely absorb or partially absorb the force exerted on the large wheel 4 or the small wheel 3, thereby preventing the force exerted on the large wheel 4 or the small wheel 3 from being transmitted to the mounting seat 32, and then being transmitted to the skateboard pedal through the mounting seat 32, thereby resisting the force exerted on the skateboard pedal by the user, and reducing or even eliminating the amount of the skateboard pedal to rise. When the skateboard pedal encounters a pit or passes through an obstacle, the skateboard wheel loses its support, and the first clamp 36 and the second clamp 37 release the compression, reducing the amount of the skateboard pedal to fall, so that the skateboard pedal remains stable.

[0049] The connecting bolt 38 is a bolt, one end of which is provided with a convex head 39, and the other end is threadedly connected with a nut 40. The convex head 39 and the nut 40 clamp the mounting seat 32, the first clamp body 36, the mounting arm 31 and the second clamp body 37. The first clamp body 36 and the second clamp body 37 are made of shock-absorbing material. The position of the nut 40 is adjusted to adjust the pre-clamping force of the first clamp body 36 and the second clamp body 37, and adjust the shock-absorbing capacity of the shock-absorbing connecting assembly 34 to prevent the shock-absorbing connecting member 34 from absorbing too much energy and affecting the sliding speed and endurance of the electric skateboard. In this embodiment, the first clamp body 36 and the second clamp body 37 are integrally formed with rubber.

[0050] Furthermore, a first clamping support 41 is provided at one end of the first clamping body 36 close to the mounting seat 32, and a second clamping support 42 is provided at one end of the second clamping body 37 away from the mounting arm 31. The first clamping support 41 has a first surrounding edge 29 arranged around the first clamping body 36, and the second clamping support 42 has a second surrounding edge 29 arranged around the second clamping body 37. The first clamping support 41 and the second clamping support 42 provide a pressure surface for the first clamping body 36 and the second clamping body 37 to prevent the first clamping body 36 and the second clamping body 37 from irregularly deforming under pressure, causing stress concentration and affecting the service life. On the other hand, the positions of the first clamping body 36 and the second clamping body 37 are restricted so that the first clamping body 36 and the second clamping body 37 are always in the best shock absorbing position.

[0051] Furthermore, the mounting seat 32 includes a high portion 43 and a low portion 44, the high portion 43 and the low portion 44 are connected as a whole and the outer ends of the high portion 43 and the low portion 44 are forked, and the connection between the high portion 43 and the low portion 44 is an arc transition to prevent stress concentration and extend the service life. The accommodating hole 35 is set in the high portion 43, and the shock-absorbing connecting component 34 is penetrated in the low portion 44 to provide a mounting position for the mounting arm 31.

[0052] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0053] Although this article uses more bridge frame 1, wheel hub mounting part 2, small wheel 3, large wheel 4, motor bracket 5, motor 6, driving wheel 7, small wheel transmission wheel 8, large wheel transmission wheel 9, small annular transmission belt 10, large annular transmission belt 11, transmission column 12, transmission hole 13, outer wheel hub 14, inner wheel hub 15, positioning hole 16, small gear ring 17, large gear ring 18, small wheel bearing 19, large wheel bearing 20, stop nut 21, through hole 22, extension part 23, the first The terms such as the first annular step 24, the second annular step 25, the dynamic bearing 26, the recessed area 27, the fastening screw 28, the surrounding edge 29, the protective cover 30, the mounting arm 31, the mounting seat 32, the mounting surface 33, the shock-absorbing connecting component 34, the receiving hole 35, the first clamp body 36, the second clamp body 37, the connecting bolt 38, the protrusion 39, the nut 40, the first clamp support 41, the second clamp support 42, the high part 43, the low part 44, etc., but the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A bridge assembly for an electric skateboard, comprising a bridge (1), with symmetrically arranged wheel hub mounting portions (2) respectively provided on both sides of the bridge (1), characterized in that: Each wheel hub mounting portion (2) is detachably mounted with a small wheel (3) or a large wheel (4) that can be replaced with each other. Two symmetrically arranged motor brackets (5) are fixed on the bridge frame (1). One end of the motor bracket (5) is fixed on the bridge frame (1), and the other end extends outward in a cantilevered manner. A motor (6) is fixed to the end of the motor bracket (5) that extends outward. The motor (6) and the small wheel (3) located on the same side of the bridge frame (1) are connected via a transmission mechanism, or the motor (6) and the large wheel (4) located on the same side of the bridge frame (1) are connected via a transmission mechanism. When the small wheel (3) is mounted on the wheel hub mounting portion (2), the motor bracket (5) has a sufficient height above the ground to prevent the motor (6) from being hit. The motor bracket (5) is a long flat structure. The transmission mechanism comprises a driving wheel (7) arranged on a power shaft of the motor (6), a small wheel transmission wheel (8) arranged on the small wheel (3), and a large wheel transmission wheel (9) arranged on the large wheel (4); the small wheel (3) and the small wheel transmission wheel (8) are detachably fixedly connected or connected as an integral structure; the large wheel (4) and the large wheel transmission wheel (9) are detachably fixedly connected or connected as an integral structure; the driving wheel (7) and the small wheel transmission wheel (8) located on the same side of the bridge frame (1) are connected via a small annular transmission belt (10) or the driving wheel (7) and the large wheel transmission wheel (9) located on the same side of the bridge frame (1) are connected via a large annular transmission belt (11); The bridge frame (1) is provided with an inclined mounting arm (31) in the middle, a mounting seat (32) is provided above the mounting arm (31), the top of the mounting seat (32) has a horizontally arranged mounting surface (33), the mounting arm (31) and the mounting seat (32) are connected via an inclined shock-absorbing connecting assembly (34), and the inclination direction of the mounting arm (31) is opposite to the inclination direction of the shock-absorbing connecting assembly (34).

2. The bridge assembly of the electric skateboard according to claim 1, characterized in that: The outer side of the small wheel transmission wheel (8) is provided with a plurality of transmission columns (12) distributed in the circumferential direction, the small wheel (3) is provided with a plurality of transmission holes (13) distributed in the circumferential direction, the transmission columns (12) correspond to the transmission holes (13) one by one, and the transmission columns (12) are inserted into the transmission holes (13); the large wheel (4) comprises an outer wheel hub (14) and an inner wheel hub (15), the outer wheel hub (14) and the inner wheel hub (15) are respectively provided with corresponding positioning holes (16), and positioning bolts are passed through the corresponding positioning holes (16) to fix the outer wheel hub (14) and the inner wheel hub (15), and the inner wheel hub (15) and the large wheel transmission wheel (9) are detachably fixedly connected or connected as an integrated structure.

3. The bridge assembly of the electric skateboard according to claim 1, characterized in that: The small wheel transmission wheel (8) is cylindrical and a small gear ring (17) is arranged on the periphery of the small wheel transmission wheel (8); the large wheel transmission wheel (9) is cylindrical and a large gear ring (18) is arranged on the periphery of the large wheel transmission wheel (9); the driving wheel (7) is a gear; the small annular transmission belt (10) and the large annular transmission belt (11) are respectively internal gear transmission belts; and the outer diameter of the small wheel transmission wheel (8) is smaller than the inner diameter of the large wheel transmission wheel (9).

4. The bridge assembly of the electric skateboard according to claim 1, characterized in that: When the small wheel (3) is separated from the wheel hub mounting portion (2), the small wheel transmission wheel (8) is separated from the wheel hub mounting portion (2) together with the small wheel (3), or the small wheel transmission wheel (8) is retained on the wheel hub mounting portion (2); when the large wheel (4) is separated from the wheel hub mounting portion (2), the large wheel transmission wheel (9) is separated from the wheel hub mounting portion (2) together with the large wheel (4), or the large wheel transmission wheel (9) is retained on the wheel hub mounting portion (2); at least one small wheel bearing (19) is provided between the small wheel (3) and the wheel hub mounting portion (2), and the small wheel bearing (19) is fixed on the small wheel (3); at least one large wheel bearing (20) is provided between the large wheel (4) and the wheel hub mounting portion (2), and the large wheel bearing (20) is fixed on the large wheel (4); and a stop nut (21) is provided at the outer end of the wheel hub mounting portion (2).

5. The bridge assembly of the electric skateboard according to any one of claims 1 to 4, characterized in that: A through hole (22) is provided at one end of the motor bracket (5), and the through hole (22) is penetrated and fixedly connected to the bridge frame (1), and the plane where the motor bracket (5) is located is perpendicular to the axial direction of the hub mounting portion (2); at least two extension portions (23) extending along the axial direction of the hub mounting portion (2) are provided on one side of the through hole (22), and the extension portions (23) are tile-shaped and the inner walls thereof are fitted to the outer surface of the bridge frame (1); a first annular step (24) is provided on the bridge frame (1), and a second annular step (25) is provided in the through hole (22), and the first annular step (24) and the second annular step (25) are fitted to each other.

6. The bridge assembly of the electric skateboard according to claim 5, characterized in that: The motor (6) is arranged horizontally, and a power shaft of the motor (6) passes from one side of the motor bracket (5) to the other side of the motor bracket (5). A power bearing (26) is provided between the power shaft and the motor bracket (5), and the driving wheel (7) is provided at the outer end of the power shaft.

7. The bridge assembly of the electric skateboard according to claim 5, characterized in that: A recessed area (27) is provided on one side of the motor support (5) on which the motor (6) is mounted, one end of the motor (6) is located in the recessed area (27), and the motor (6) is fixed to the motor support (5) by means of a plurality of fastening screws (28); a peripheral edge (29) is provided on the other side of the motor support (5) around the transmission mechanism; a protective cover (30) is fixed on the peripheral edge (29) so that the transmission mechanism is protected; the motor support (5) is arranged parallel to a horizontal plane or arranged to be inclined outward and upward from the motor support (5).

8. The bridge assembly of the electric skateboard according to claim 7, characterized in that: A receiving hole (35) is provided below the mounting surface (33) and is located on the mounting seat (32) and is arranged obliquely, and the upper end of the mounting arm (31) is located in the receiving hole (35); the upper end of the mounting arm (31) is in the shape of a column, and a gap is left between the upper end of the mounting arm (31) and the bottom of the receiving hole (35), and / or a gap is left between the side of the mounting arm (31) and the wall of the receiving hole (35); the upper end of the mounting arm (31) has a smooth surface, and / or the bottom of the receiving hole (35) has a smooth surface.

9. The bridge assembly of the electric skateboard according to claim 8, characterized in that: The portion below the upper end of the mounting arm (31) is flat and its width gradually increases from the upper end to the lower end; the shock-absorbing connection assembly (34) comprises a first clamp (36), a second clamp (37) and a connecting bolt (38); the first clamp (36) is located on one side of the mounting arm (31) and between the mounting seat (32) and the mounting arm (31); the second clamp (37) is located on the other side of the mounting arm (31); the connecting bolt (38) is passed through the mounting seat (32), the first clamp (36), the mounting arm (31) and the second clamp (37); and the connecting bolt (38) fastens the mounting seat (32), the first clamp (36), the mounting arm (31) and the second clamp (37) through a fastening structure.

10. The bridge assembly of the electric skateboard according to claim 9, characterized in that: The connecting bolt (38) is a bolt, one end of which is provided with a boss (39), and the other end of which is threadedly connected with a nut (40), the boss (39) and the nut (40) clamp the mounting seat (32), the first clamp (36), the mounting arm (31) and the second clamp (37), and the first clamp (36) and the second clamp (37) are made of shock-absorbing material.

11. The bridge assembly of the electric skateboard according to claim 10, characterized in that: A first clamping support (41) is provided at one end of the first clamping body (36) close to the mounting seat (32), and a second clamping support (42) is provided at one end of the second clamping body (37) away from the mounting arm (31). The first clamping support (41) has a first surrounding edge arranged around the first clamping body (36), and the second clamping support (42) has a second surrounding edge arranged around the second clamping body (37).

12. The bridge assembly of the electric skateboard according to claim 8, characterized in that: The mounting seat (32) comprises a high portion (43) and a low portion (44), the high portion (43) and the low portion (44) are connected as a whole and the outer ends of the high portion (43) and the low portion (44) are forked, the connection between the high portion (43) and the low portion (44) is in an arc-shaped transition, the accommodating hole (35) is arranged in the high portion (43), and the shock-absorbing connecting assembly (34) is passed through the low portion (44).

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