CN106741520A - The trailing wheel assembling structure and three-wheel scooter of three-wheel scooter - Google Patents

Abstract

The invention discloses a rear wheel assembly structure of a three-wheeled scooter, comprising a main frame, a bottom plate connection block, a grinding disc assembly, a first rear wheel, a second rear wheel, a first wheel bracket, and a second wheel bracket, which are used to limit the The first limiter for the movement of the first wheel bracket is used to limit the second limiter for the movement of the second wheel bracket. The bottom plate connecting block is connected to the main frame; the grinding disc assembly is connected to the base plate connecting block, and the grinding disc assembly has The opposite first end and second end; one end of the first wheel bracket is fixedly connected to the first rear wheel, and the other end is flexibly connected to the first end of the grinding disc assembly; one end of the second wheel bracket is fixedly connected to the second rear wheel, and the other end It is movably connected with the second end of the grinding disc assembly; one end of the first limiting member is connected to the connecting block of the bottom plate, and the other end is connected to the first wheel bracket; and one end of the second limiting member is connected to the connecting block of the bottom plate, The other end is connected with the second wheel bracket. The present invention also provides a three-wheeled scooter, which includes the above-mentioned rear wheel assembly structure of the three-wheeled scooter.

Description

Rear wheel assembly structure of three-wheel scooter and three-wheel scooter

【Technical field】

The invention relates to the technical field of vehicles, in particular to a rear wheel assembly structure of a three-wheel scooter and the three-wheel scooter.

【Background technique】

At present, three-wheeled scooters have become one of the main means of transportation in urban and rural areas, especially electric vehicles have occupied a considerable market share because of their clean energy, lightness and flexibility. However, electric vehicles at the present stage, including but not limited to two-wheeled scooters and electric tricycles or four-wheeled vehicles have different defects respectively. For example, the two rear wheels at the back of the existing electric tricycle usually adopt the coaxial connection of the rear wheels, so that the two rear wheels are always in a balanced state or close to a balanced state during static, driving, and turning, even when passing through ditches and ridges. in this way. Such a structure is particularly prone to rollover when driving, turning, passing through ditches and ridges.

【Content of invention】

The main purpose of the present invention is to provide a three-wheeled scooter assembly structure and a three-wheeled scooter that can improve the balance of the three-wheeled scooter and reduce the probability of rollover when the electric vehicle is driving, turning or passing through ditches or ridges.

In order to achieve the above object, the present invention provides a rear wheel assembly structure of a three-wheeled scooter, comprising: a main frame, a bottom plate connection block, a grinding disc assembly, a first rear wheel, a second rear wheel, a first wheel bracket, a second The wheel bracket is used to limit the movement of the first wheel bracket, and the second spacer is used to limit the movement of the second wheel bracket. The bottom plate connecting block is connected with the main frame; the grinding disc assembly is connected On the bottom plate connection block, the grinding disc assembly has opposite first and second ends; one end of the first wheel bracket is fixedly connected to the first rear wheel, and the other end is movably connected to the first end of the grinding disc assembly; one end of the second wheel bracket is fixedly connected On the second rear wheel, the other end is movably connected to the second end of the grinding disc assembly; one end of the first limiting member is connected to the bottom plate connecting block, and the other end is connected to the first wheel bracket; and the second limiting member One end is connected with the bottom plate connecting block, and the other end is connected with the second wheel bracket.

Preferably, the first wheel support rotates about the first axis relative to the first end of the grinding disc assembly, the second wheel support rotates about the second axis relative to the second end of the grinding disc assembly, and the first axis is parallel to The second axis, the grinding disc assembly rotates with respect to the bottom plate connecting block around the third axis, and the third axis is perpendicular to the first axis and the second axis.

Preferably, the rear wheel assembly structure of the three-wheeled scooter further includes a central shaft, the central shaft passes through the rear end of the grinding disc assembly and is fixedly connected to the bottom plate connecting block, and the grinding disc assembly rotates around the central shaft.

Preferably, the central shaft is a bolt.

Preferably, bearings are provided at one or more connection positions between the grinding disc assembly and the center shaft, the first wheel bracket and the second wheel bracket.

Preferably, the grindstone assembly is a turntable provided with left and right trunnions and the left and right trunnions define respectively a first end and a second end of the grindstone assembly.

Preferably, a supporting plate is arranged on the connecting block of the bottom plate, a first compression spring and a second pressing spring are arranged on opposite sides of the supporting plate, and the grinding disc assembly rotates with respect to the connecting block of the bottom plate with the third axis as the axis, When the grinding disc assembly rotates toward the first direction, the resistance generated by the first compression spring in a plane perpendicular to the third axis prevents the grinding disc assembly from continuing to move, and when the grinding disc assembly rotates toward the second direction, the second compression spring The resistance generated in the plane perpendicular to the third axis prevents the grinding disc assembly from continuing to move, and the first direction is opposite to the second direction.

Preferably, the grinding disc assembly includes a turntable, and the turntable also includes: a first compression spring, a second compression spring, and a mounting groove for accommodating the first compression spring and the second compression spring; the installation The groove is arranged in an arc shape, and the installation groove at least runs through at least one surface of the grinding disc assembly; the position of the bottom plate connection block corresponding to the installation groove is provided with a backing plate, and the backing plate can be inserted into the the mounting groove, and the abutting plate is located in the middle of the mounting groove; the first end of the first compression spring abuts against the abutting plate, and the second end of the first compression spring abuts against On the first groove wall of the installation groove; the first end of the second compression spring abuts against the abutment plate, and the second end of the second compression spring abuts against the wall of the installation groove On the second groove wall opposite to the first groove wall.

Preferably, the first limiting member is a first fixed tie rod; the first end of the first fixed tie rod is fixedly connected to the bottom plate connection block, and the second end of the first fixed tie rod is connected to the first fixed tie rod. The wheel bracket is fixedly connected, and the second limiting member is a second fixed tie rod; the first end of the second fixed tie rod is fixedly connected with the bottom plate connection block, and the second end of the second fixed tie rod is connected with the The second wheel bracket is fixedly connected.

The present invention also provides a three-wheeled scooter, which includes the above-mentioned rear wheel assembly structure of the three-wheeled scooter.

Compared with the prior art, the rear wheel assembly structure of the three-wheeled scooter provided by the present invention, the two rear wheels of the structure are not directly connected by one shaft, when one of the rear wheels travels to a ditch or a pothole, in addition One will not be tilted, but will remain in its original state, thereby reducing the probability of the vehicle rolling over. In addition, the grinding disc assembly is installed on the connecting block of the bottom plate, and the installation is simple and convenient, thereby improving the production and installation efficiency of the whole vehicle.

Further, the first wheel support rotates around the first axis relative to the first end of the grinding disc assembly, the second wheel support rotates around the second axis relative to the second end of the grinding disc assembly, and the first axis is parallel to the first axis. Two shafts, the grinding disc assembly rotates relative to the bottom plate connecting block with the third shaft as the axis, and the third shaft is perpendicular to the first shaft and the second shaft. The two rear wheels restrict each other through the cooperation of the wheel bracket and the grinding disc assembly, which better keeps the balance of the three-wheeled scooter.

Further, the resistance generated by the first compression spring and the second compression spring in a plane perpendicular to the third axis prevents the grinding disc assembly from continuing to move, and the rear wheel can quickly obtain an effective restoring force after tilting to maintain the balance of the three-wheeled scooter to prevent rearward movement. The wheel is tilted too much.

A three-wheeled scooter provided by the invention adopts the rear wheel assembly structure of the three-wheeled scooter, which also has the advantages of good balance and the like.

【Description of drawings】

Fig. 1 is the structural diagram of the rear wheel assembly structure installation state of the first embodiment of the present invention three-wheel scooter;

Fig. 2 is a structural diagram of the rear wheel assembly structure of the three-wheeled scooter according to the first embodiment of the present invention;

3 is an exploded view of the rear wheel assembly structure of the three-wheeled scooter according to the first embodiment of the present invention;

Fig. 4 is a schematic diagram of the enlarged structure at A in Fig. 3;

Fig. 5 is a cross-sectional view of the rear wheel assembly structure of the three-wheeled scooter according to the first embodiment of the present invention.

【detailed description】

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The first embodiment of the present invention provides a rear wheel assembly structure of a three-wheeled scooter.

Please refer to Figs. 1 to 5, Fig. 1 is a structural diagram of the installation state of the rear wheel assembly structure of the three-wheeled scooter according to the first embodiment of the present invention; Fig. 2 is a diagram of the rear wheel assembly structure of the three-wheeled scooter according to the first embodiment of the present invention Structural diagram; Fig. 3 is an exploded view of the rear wheel assembly structure of the three-wheeled scooter according to the first embodiment of the present invention; Fig. 4 is an enlarged schematic diagram of the structure at A in Fig. 3; Fig. 5 is a three-wheeled skateboard according to the first embodiment of the present invention Cross-sectional view of the rear wheel assembly structure of the car. This embodiment provides a rear wheel assembly structure of a three-wheeled scooter. The rear wheel assembly structure of the three-wheeled scooter includes: a main frame 9, a base plate connecting block 1, a grinding disc assembly 2, a first rear wheel 7, a second rear wheel 8, a first wheel bracket 3, a second wheel bracket 4, The first limiting member 5 is used to limit the movement of the first wheel bracket 3 , and the second limiting member 6 is used to limit the movement of the second wheel bracket 4 . The base plate connecting block 1 is connected with the main frame 9; the grinding disc assembly 2 is installed on the base plate connecting block 1, the grinding disc assembly 2 is connected with the base plate connecting block 1, and the grinding disc assembly 2 has a first end and a second end opposite to each other, the first end And the second end is an end connected with the first wheel bracket 3 and the second wheel bracket 4 respectively. One end of the first wheel support 3 is fixedly connected to the first rear wheel 7, and the other end is movably connected to the first end of the grinding disc assembly 2; Active connection on the second end. One end of the first limiting member 5 is connected to the bottom plate connecting block 1, and the other end is connected to the first wheel bracket 3; one end of the second limiting member 6 is connected to the bottom plate connecting block 1, and the other end is connected to the second wheel bracket. Bracket 4 is connected.

It can be understood that the movable connection mentioned in the present invention includes, but is not limited to, relative movement between two components in a product installation state.

The bottom plate connection block 1 connects the first rear wheel 7 and the second rear wheel 8 to the main frame 9 of the three-wheeled scooter. In this embodiment, the bottom plate connection block 1 is arranged in a flat plate shape. The bottom plate connection block 1 is also used to support the grinding disc assembly 2 . The grinding disc assembly 2 is fixedly installed above the bottom plate connection block 1 . It can be understood that the grinding disc assembly 2 can also be fixedly installed under the bottom plate connecting block 1 .

The first wheel bracket 3 is used for installing the first rear wheel 7 . Specifically, the first wheel bracket 3 includes: a first fixing rod 31 , and a first connecting portion 32 extending from the first end of the first fixing rod 31 and bent into an arch shape. Wherein, the first rear wheel 7 is mounted on the end of the first fixing rod 31 away from the first connecting portion 32 , and the end of the first connecting portion 32 away from the first fixing rod 31 is movably connected with the first end of the grinding disc assembly 2 . It should be noted that the first connecting portion 32 in the first wheel bracket 3 is arranged in an arch shape to increase the elasticity of the first wheel bracket 3 and thereby improve the shock absorption effect of the vehicle.

The second wheel bracket 4 is used for installing the second rear wheel 8 . Specifically, the second wheel bracket 4 includes: a second fixing rod 41 , and a second connecting portion 42 extending from the first end of the second fixing rod 41 and bent into an arch shape. Wherein, the second rear wheel 8 is mounted on an end of the second fixing rod 41 away from the second connecting portion 42 , and the end of the second connecting portion 42 away from the second fixing rod 41 is movably connected with the second end of the grinding disc assembly 2 . It should be noted that the second connecting portion 42 in the second wheel bracket 4 is arranged in an arch shape to increase the elasticity of the second wheel bracket 4 and thus improve the shock absorption effect of the whole vehicle.

The first stopper 5 is located between the first wheel bracket 3 and the base plate connection block 1, and it is mainly used to limit the movement of the first wheel bracket 3, thereby ensuring that the first wheel bracket 3 can move within a limited range, ensuring the stability of the vehicle. Specifically, the first limiting member 5 is a first fixing rod. Wherein, the first fixed tie rod has opposite first end and second end, the first end of the first fixed tie rod is connected with the bottom plate connecting block 1 , and the second end of the first fixed tie rod is connected with the first wheel bracket 3 . Preferably, the first end and/or the second end of the first fixed tie rod is a ball joint structure.

The second limiter 6 is located between the second wheel bracket 4 and the base plate connection block 1, and it is mainly used to limit the movement of the second wheel bracket 4, thereby ensuring that the second wheel bracket 4 can move within a limited range, ensuring the stability of the vehicle. Specifically, the second limiting member 6 is a second fixing rod. Wherein, the second fixed tie rod has opposite first end and second end, the first end of the second fixed tie rod is connected with the bottom plate connecting block 1 , and the second end of the second fixed tie rod is connected with the second wheel bracket 4 . Preferably, the first end and/or the second end of the second fixed tie rod is a ball joint structure.

The grinding disc assembly 2 includes a turntable 21 , a left trunnion 22 and a right trunnion 23 . The left trunnion 22 and the right trunnion 23 are located at opposite ends of the turntable 21 and connected to the turntable 21 . The left trunnion 22 runs through the first wheel bracket 3 and is flexibly connected with it, and the first wheel bracket 3 can rotate around the left trunnion 22 . The right trunnion 23 runs through the second wheel bracket 4 and is flexibly connected with it, and the second wheel bracket 4 can rotate around the right trunnion 23 . It should be noted that the left trunnion 22 drives the turntable 21 to rotate clockwise or counterclockwise under the action of force, and when the force is removed, the left trunnion 22 returns to its original position. In addition, preferably, the left trunnion 22 can vibrate up and down relative to the turntable 21 under the action of the vertical force of the turntable 21 , and the left trunnion 22 has the function of shock absorption. Similarly, the right trunnion 23 can also drive the turntable 21 to rotate clockwise or counterclockwise under the action of force, and when the force is removed, the right trunnion 23 returns to its original position. In addition, preferably, the right trunnion 23 can vibrate up and down relative to the turntable 21 under the action of the vertical force of the turntable 21 , and the right trunnion 23 has the function of shock absorption. In addition, the grinding disc assembly 2 is installed on the bottom plate connecting block 1 through the central shaft. In this embodiment, the central shaft is the bolt 24 as an example for illustration. Specifically, the turntable 21 of the grinding disc assembly 2 is arranged in a cylindrical shape, and the middle part of the turntable 21 is provided with a bolt through hole (not shown in the figure), and the bolt 24 passes through the bolt through hole on the turntable 21 and is fixedly connected with the bottom plate connecting block 1 . It should be noted that the bolt holes of the turntable 21 pass through the entire central axis of the turntable 21 , and the turntable 21 can rotate around the bolts 24 . In order to reduce the friction between the turntable 21 and the bolt 24 and reduce the wear of the turntable 21 , further, the rear wheel assembly structure of the three-wheeled scooter further includes at least two first bearings 25 . In this embodiment, there are two first bearings 25 . Specifically, two first bearings 25 are respectively placed at two ends of the bolt through hole. The two first bearings 25 are embedded in the turntable 21 of the grinding disc assembly 2 , and the inner holes of the first bearings 25 are sleeved on the bolts 24 .

In order to make the turntable 21 return to its original position after the external force is removed, in this embodiment, the turntable 21 is provided with a first compression spring 211 and a second compression spring 212, and the first compression spring 211 and the second compression spring 212 can be It is any elastic material such as springs and torsion springs that provide elastic force. An installation slot 213 for accommodating the first compression spring 211 and the second compression spring 212 is also provided in the turntable 21 . The installation groove 213 is arranged in an arc shape, and the installation groove 213 at least penetrates the lower surface of the turntable 21 , preferably, the installation groove 213 completely penetrates the turntable 21 , that is, penetrates the upper and lower surfaces of the turntable 21 . In order to ensure that the two rear wheels can always maintain balance, the mounting groove 213 must be set at the balance position of the two rear wheels. It is further explained that, in order to prevent the turntable 21 from overturning due to excessive rotation, in this embodiment, the central angle of the mounting groove 213 is about 150°. Based on the elastic force of the first compression spring 211 and the second compression spring 212, the maximum rotation range of the turntable 21 is about 40°, which can be set according to the actual situation. The base connecting block 1 is provided with a supporting plate 214 at a position corresponding to the installation groove 213 . During installation, the resisting plate 214 is inserted into the installation groove 213 , and the resisting plate 214 is located in the middle of the installation groove 213 . It should be noted that the two ends of the installation groove 213 include: a first groove wall, and a second groove wall opposite to the first groove wall. The distance between the butt plate 214 and the first groove wall is equal to the distance between the butt plate 214 and the second groove wall, thereby ensuring the balance of the two rear wheels. A first end of the first compression spring 211 abuts against the supporting plate 214 , and a second end of the first compression spring 211 abuts against the first groove wall of the installation groove 213 . The first end of the second compression spring 212 abuts against the supporting plate 214 , and the second end of the second compression spring 212 abuts against the second slot wall. When the three-wheeled scooter needs to turn right, the grinding disc assembly 22 generates a centripetal force, and the left trunnion 22 drives the turntable 21 to rotate clockwise. The turntable 21 rotates, so that the first compression spring 211 is stretched, and the second compression spring 212 is compressed. Both the first rear wheel 7 and the second rear wheel 8 have turned. After the centripetal force is withdrawn, the first compression spring 211 and the second compression spring 212 return to their original states, so that the first rear wheel 7 and the second rear wheel 8 also return to their original states. Three-wheeled scooters turn left is the same working principle. The above settings enable the three-wheeled scooter to move freely during normal driving and turning, reducing the probability of overturning. In addition, since the left trunnion 22 is movably connected with the first wheel bracket 3, and the right trunnion 23 is movably connected with the second wheel bracket 4, therefore, the present invention can overcome the defect that the two rear wheels are coaxial and cause the vehicle to overturn in the prior art . Specifically, the turntable 21 is provided with a first mounting hole (not shown) adapted to the first end of the left trunnion 22, and the turntable 21 is also provided with a first mounting hole symmetrical to the right trunnion. The second mounting hole (not shown in the figure) that the first end of 23 fits. Wherein, the first end of the left trunnion 22 is screwed or engaged with the first installation hole, and the second end of the right trunnion 23 is screwed or engaged with the second installation hole. The second end of the left trunnion 22 is connected with the first wheel bracket 3 through the second bearing (not shown in the figure); the second end of the right trunnion 23 is connected with the first wheel bracket through the third bearing (not shown in the figure). Two wheel supports 4 are connected. In this embodiment, the first ends of the left trunnion 22 and the right trunnion 23 are arranged in a square shape. Correspondingly, the first installation hole and the second installation hole are also arranged in the shape of square holes. The second ends of the left trunnion 22 and the right trunnion 23 are arranged in a cylindrical shape. The second ends of the two are respectively inserted into the inner holes of the bearing, and the outer wall of the bearing is embedded on the wheel bracket, so that the left trunnion 22 is flexibly connected with the first wheel bracket 3, and the right trunnion 23 is connected with the second wheel bracket. 4 active connections.

As a modification, the specific structure of the grinding disc assembly 2 is not limited, it only needs to be rotatable with the central axis as its central axis, and it can be cylindrical, square, prism and so on. The left trunnion 22 and the right trunnion 23 of the grinding disc assembly 2 can be omitted, and one end of the first wheel support 3 and the second wheel support 4 can be directly connected to the turntable 21 .

It can be understood that in the present invention, bearings can be provided at the connection positions between the various elements as required, such as the connection positions between the central shaft and the grinding disc assembly 2, 2a, the grinding disc assembly 2 and the first wheel bracket 3, 3a and the second wheel At the connection position of bracket 4, 4a.

The rear wheel assembly structure of three-wheel scooter can be arranged on the front wheel of rear wheel and can also be arranged in the assembly structure of rear wheel, and it also can be used on vehicles such as three-wheel electric vehicle or four-wheel electric vehicle or skateboard.

The second embodiment of the present invention provides a three-wheeled scooter, which includes the rear wheel assembly structure of the three-wheeled scooter as described in the first embodiment and its modified implementation. The three-wheeled scooter can be an electric vehicle, a motor vehicle or any other type of vehicle.

Compared with the prior art, the rear wheel assembly structure of the three-wheeled scooter provided by the present invention, the two rear wheels of the structure are not directly connected by one shaft, when one of the rear wheels travels to a ditch or a pothole, in addition One will not be tilted, but will remain in its original state, thereby reducing the probability of the vehicle rolling over. In addition, the grinding disc assembly is installed on the connecting block of the bottom plate, and the installation is simple and convenient, thereby improving the production and installation efficiency of the whole vehicle.

Further, the first wheel support rotates around the first axis relative to the first end of the grinding disc assembly, the second wheel support rotates around the second axis relative to the second end of the grinding disc assembly, and the first axis is parallel to the first axis. Two shafts, the grinding disc assembly rotates relative to the bottom plate connecting block with the third shaft as the axis, and the third shaft is perpendicular to the first shaft and the second shaft. The two rear wheels restrict each other through the cooperation of the wheel bracket and the grinding disc assembly, which better keeps the balance of the three-wheeled scooter.

Further, the resistance generated by the first compression spring and the second compression spring in a plane perpendicular to the third axis prevents the grinding disc assembly from continuing to move, and the rear wheel can quickly obtain an effective restoring force after tilting to maintain the balance of the three-wheeled scooter to prevent rearward movement. The wheel is tilted too much.

A three-wheeled scooter provided by the invention adopts the rear wheel assembly structure of the three-wheeled scooter, which also has the advantages of good balance and the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements within the principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A rear wheel assembly structure of a three-wheeled scooter, characterized in that it comprises: a main frame, a base plate connection block, a grinding disc assembly, a first rear wheel, a second rear wheel, a first wheel bracket, and a second wheel bracket , a first limiting member for restricting the movement of the first wheel bracket, and a second limiting member for restricting the movement of the second wheel bracket, The connecting block of the bottom plate is connected with the main frame; The grinding disc assembly is connected to the bottom plate connection block, and the grinding disc assembly has opposite first and second ends; One end of the first wheel bracket is fixedly connected to the first rear wheel, and the other end is movably connected to the first end of the grinding disc assembly; One end of the second wheel bracket is fixedly connected to the second rear wheel, and the other end is movably connected to the second end of the grinding disc assembly; One end of the first limiting member is connected to the bottom plate connecting block, and the other end is connected to the first wheel bracket; and one end of the second limiting member is connected to the bottom plate connecting block, and the other end is connected to the second wheel bracket. 2. The rear wheel assembly structure of a three-wheeled scooter as claimed in claim 1, wherein the first wheel support rotates with respect to the first end of the grinding disc assembly with the first axis as the axis, and the second wheel support rotates with respect to the first end of the grinding disc assembly. The second end of the grinding disc assembly rotates around the second axis, the first axis is parallel to the second axis, and the grinding disc assembly rotates around the third axis relative to the bottom plate connecting block, and the third axis is perpendicular to the first axis and the second axis. two axes. 3. The rear wheel assembly structure of the three-wheeled scooter as claimed in claim 1, wherein the rear wheel assembly structure of the three-wheeled scooter further comprises a central shaft, and the central shaft runs through the rear end of the grinding disc assembly and is fixedly connected to the base plate The connecting block, the grinding disc assembly can be rotated around the central axis. 4. The rear wheel assembly structure of a three-wheeled scooter according to claim 3, wherein the central axis is a bolt. 5. The rear wheel assembly structure of the three-wheeled scooter according to claim 3, characterized in that, one or more connection positions between the grinding disc assembly and the central axis, the first wheel bracket and the second wheel bracket are set There are bearings. 6. The rear wheel assembly structure of a three-wheeled scooter according to claim 3, wherein the grinding disc assembly is a turntable provided with a left trunnion and a right trunnion, and the left trunnion and the right trunnion are respectively Defined as the first end and the second end of the disc assembly. 7. The rear wheel assembly structure of a three-wheeled scooter according to claim 2, wherein a support plate is arranged on the connecting block of the bottom plate, and a first compression spring and a second pressure spring are arranged on opposite sides of the support plate. Two pressure springs, the grinding disc assembly rotates with the third axis as the axis relative to the bottom plate connecting block, when the grinding disc assembly rotates in the first direction, the resistance produced by the first compression spring in a plane perpendicular to the third axis prevents the grinding disc The assembly continues to move, and when the grinding disk assembly rotates toward the second direction, the resistance produced by the second compression spring in a plane perpendicular to the third axis prevents the grinding disk assembly from continuing to move, and the first direction is opposite to the second direction. 8. The rear wheel assembly structure of a three-wheeled scooter as claimed in claim 1, wherein said grinding disc assembly comprises a turntable, which also includes: a first compression spring, a second compression spring, and a The installation slots for accommodating the first compression spring and the second compression spring; the installation slots are arranged in an arc shape, and the installation slots at least pass through at least one surface of the grinding disc assembly; the bottom plate connecting block corresponds to the The position of the installation groove is provided with a backing plate. When installing, the backing plate can be inserted into the installation groove, and the backing plate is located in the middle of the installation groove; the first end of the first compression spring is against the connected to the backing plate, the second end of the first compression spring abuts against the first groove wall of the installation groove; the first end of the second compression spring abuts against the backing plate , the second end of the second compression spring abuts against the second groove wall opposite to the first groove wall of the installation groove. 9. The rear wheel assembly structure of a three-wheeled scooter according to claim 1, wherein the first limiting member is a first fixed tie rod; the first end of the first fixed tie rod is connected to the bottom plate The connecting block is fixedly connected, the second end of the first fixed tie rod is fixedly connected with the first wheel bracket, and the second limiting member is a second fixed tie rod; the first end of the second fixed tie rod is connected with the The bottom plate connection block is fixedly connected, and the second end of the second fixed tie rod is fixedly connected with the second wheel bracket. 10. A three-wheeled scooter, characterized in that it comprises the rear wheel assembly structure of the three-wheeled scooter according to any one of claims 1-9.