Personal mobile device with protective device

Abstract

The present disclosure relates to a personal mobility device (PMD) having a footboard unit comprising a footboard, a front wheel disposed on the footboard, and a rear wheel disposed behind the front wheel on the footboard. The PMD further has a steering unit comprising a steering shaft, a fixed unit connected to one end of the steering shaft and the footboard unit, and a handlebar disposed at the other end of the steering shaft. The PMD further has side guards disposed on both sides of the footboard unit and extending along the length of the footboard.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0082463, filed on June 24, 2021, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] Embodiments of this disclosure relate to a personal mobility device (PMD) having one or more protective devices that mitigate impact when the PMD falls over or collides with an external object. Background Technology

[0004] The content described in the background section is merely to provide background information for this invention and does not constitute prior art.

[0005] In recent years, the importance of vehicles as a means of transportation has been declining, while the importance of personal mobile devices (PMDs) has been increasing. Here, PMDs are transportation devices, such as electric scooters, bicycles, etc.

[0006] PMDs offer superior maneuverability compared to vehicles on non-vehicle-only roads. For example, on narrow roads, vehicles struggle to travel at high speeds or make sharp turns. Meanwhile, due to their smaller size, PMDs can more easily travel at higher speeds or make sharp turns on narrow roads.

[0007] However, compared to vehicles, PMDs lack occupant protection. For example, in the event of a collision with an external object, a vehicle can use its chassis, airbags, and other features to mitigate the impact on occupants. However, PMDs lack occupant protection, and occupants may suffer serious injury. Furthermore, while research on vehicle technologies to prevent collisions with pedestrians or reduce the impact on pedestrians is ongoing, research on PMDs is insufficient.

[0008] Furthermore, compared to vehicles, PMDs are more susceptible to impacts or collisions. Due to their simple structure, PMDs are prone to breakage or failure even from simple impacts. Summary of the Invention

[0009] This disclosure provides a personal mobile device (PMD), and in one example, the personal mobile device (PMD) includes: a foot pedal unit including a foot pedal; a front wheel disposed on the foot pedal and a rear wheel disposed behind the front wheel on the foot pedal; a steering unit including a steering shaft, a fixing unit connecting one end of the steering shaft and the foot pedal unit, and a handle disposed at the other end of the steering shaft; and side guards disposed on both sides of the foot pedal unit and extending along the length direction of the foot pedal.

[0010] A personal mobility device (PMD) of another embodiment includes a frame unit including a body frame, a front wheel disposed in front of the body frame, and a rear wheel disposed behind the front wheel in the body frame; a steering unit including a steering shaft, a fixing unit connecting the steering shaft and the frame unit, and a handlebar disposed at one end of the steering shaft; and side guards disposed at both sides of the body frame and extending in a length direction of the body frame. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1A and Figure 1A is a perspective view of a personal mobility device (PMD) having guards according to an embodiment of the present disclosure.

[0012] Figure 2A , Figure 2A and Figure 2A is a front view of a PMD having guards according to an embodiment of the present disclosure.

[0013] Figure 3A , Figure 3A and Figure 3A is a plan view of a PMD having guards according to an embodiment of the present disclosure.

[0014] Figure 4 is a perspective view for explaining rotation of a shaft guard included in the guard according to an embodiment of the present disclosure.

[0015] Figure 5A , Figure 5A , Figure 5A and Figure 5A are views of a PMD having guards according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0016] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. It is to be noted that, when providing reference numerals to components in the drawings, the same or equivalent components are denoted by the same reference numerals even if they are shown in different drawings. In describing the present disclosure, detailed descriptions of related known functions or configurations will be omitted when they can make the subject matter of the present disclosure unclear.

[0017] Also, in describing components of the present disclosure, terms such as first, second, A, B, (a), (b) or the like can be used. Such terms are used only to distinguish any element from other element(s) similar or comparable to the element. The features, order, etc. of the corresponding elements are not limited by the terms. Throughout the specification, unless explicitly described to the contrary, examples described as "including" or "comprising" a component should be understood to imply the inclusion of other elements, not the exclusion of any other elements. The terms such as "component", "module", etc. described in the specification refer to a unit processing at least one function or operation, and can be implemented as hardware or software or a combination of hardware and software, and can include at least one processor. When components, devices, elements, etc. of the present disclosure are described as having a purpose or performing an operation, function, etc., the components, devices, or elements should be considered as "configured to" meet the purpose or perform the operation or function herein.

[0018] In the following description, a personal mobility device (hereinafter referred to as "PMD") is a kind of transportation device. For example, types of PMD include a personal mobility vehicle (PM vehicle), a micro mobility vehicle, an electric bicycle, an electric scooter, an electric skateboard, an electric wheelchair, an electric bicycle, a two-wheel drive device, a smart vehicle, a shuttle vehicle, a personal mobility device, a personal flight device, a smart mobility device, a shared mobility device, a first mile and last mile vehicle, a PBV (Purpose Built Vehicle), a PAV (Personal Air Vehicle), a vehicle, an electric vehicle, a motor vehicle, a passenger car, an alternative fuel vehicle, etc.

[0019] In the following description, the PMD with a guard is described in the form of a scooter, but the PMD with a guard can also be implemented in other forms.

[0020] Figure 1A is a perspective view of a PMD with a guard according to an embodiment of the present disclosure.

[0021] Referring to Figure 1A , the PMD includes a steering unit 100, a handle 102, a steering shaft 104, a fixing unit 106, a foot pedal unit 110, a foot pedal 112, a front wheel 114, a rear wheel 116, a shaft guard 120, a shaft guard connection unit 122, a front guard 130, a front guard connection unit 132, a side guard 140 on both sides of the foot pedal 112, a side guard connection unit 142, a rear guard 150, and a rear guard connection unit 152.

[0022] According to an embodiment of the disclosure, the PMD with guard devices can include a steering unit 100, a footrest unit 110, a shaft guard device 120, and a side guard device 140. According to another embodiment of the disclosure, the PMD with guard devices can include a steering unit 100, a footrest unit 110, and a side guard device 140. The PMD can include any one or more of the guard devices.

[0023] The steering unit 100 includes a handle 102, a steering shaft 104, and a fixing unit 106. Here, the fixing unit 106 connects one end of the steering shaft 104 and the footrest unit 110. The handle 102 is disposed at the other end of the steering shaft 104. A rider can control the steering of the PMD using the steering unit 100.

[0024] The footrest unit 110 includes a footrest 112, a front wheel 114, and a rear wheel 116. The front wheel 114 is disposed on the footrest 112. The rear wheel 116 is disposed behind the front wheel 114 on the footrest 112. The footrest unit 110 can further include a foot brake.

[0025] The footrest 112 is where a rider places his / her feet. One of the front wheel 114 and the rear wheel 116 can be a steering wheel. When the PMD is an electric scooter, at least one of the front wheel 114 and the rear wheel 116 can be a drive wheel.

[0026] The shaft guard device 120 is disposed in front of the steering shaft 104 and extends in the length direction of the steering shaft 104.

[0027] The side guard device 140 is disposed on both sides of the footrest unit 110 and extends in the length direction of the footrest 112.

[0028] The PMD according to an embodiment of the disclosure can further include more components, such as a front guard device 130, a front guard device connection unit 132, a rear guard device 150, and a rear guard device connection unit 152.

[0029] The front guard device 130 is disposed adjacent to the front wheel 114 and is configured to protect the front wheel 114. The front guard device 130 can be connected to the front wheel 114 or the footrest 112 through the front guard device connection unit 132.

[0030] The rear guard device 150 is disposed adjacent to the rear wheel 116 and is configured to protect the rear wheel 116. The rear guard device 150 can be connected to the rear wheel 116 or the footrest 112 through the rear guard device connection unit 152.

[0031] According to an embodiment of the disclosure, the axle guard 120, the front guard 130, the side guards 140, and the rear guard 150 can be made of a single material or a composite material for absorbing impact. For example, each guard can be made of elastic rubber or made with an inner plastic frame and an outer sponge material. When each guard is made of a material that absorbs impact, the occupant can be protected even if the guard collides with an external object. In addition, when the guard collides with a pedestrian, the impact on the pedestrian can be reduced.

[0032] According to an embodiment of the disclosure, the cross section of the side guard 140 can be a sector shape. Specifically, the cross section obtained by cutting the side guard 140 in a direction perpendicular to the length direction of the footboard 112 can have a sector shape including a curved area, and the curved area of the sector shape is configured to face in the opposite direction of the ground side. In other words, the center of the sector shape can face the ground. In addition, the cross section of the side guard 140 according to another embodiment of the disclosure can be implemented in any form capable of expanding (e.g., increasing) the area in contact with the ground when the PMD is laterally inclined.

[0033] According to the cross-sectional shape of the side guard 140, the contact area between the side guard 140 and the ground is expanded or increased when the PMD is inclined, so that the impact applied to the PMD can be reduced. In addition, according to the cross-sectional shape of the side guard 140, the PMD can maximize the angle at which the PMD is inclined when traveling, thereby improving the driving performance.

[0034] The PMD according to an embodiment of the disclosure can further include a side guard connection unit 142 connecting the footboard 112 and each side guard 140.

[0035] Each side guard connection unit 142 according to an embodiment of the disclosure is configured to be rotatable with respect to the footboard 112 about a first rotation axis parallel to the length direction of the footboard 112. Here, the first rotation axis is a virtual rotation axis and can be located inside the footboard 112. Through the rotation of the side guard connection unit 142, the side guard 140 can serve as a kick stand, a support fixture, or a rest fixture of the PMD. This maximizes the utilization rate of the PMD.

[0036] Each side guard connecting unit 142 according to an embodiment of the disclosure can be provided with a buffer member or a structure for buffering. Here, the buffer member can include one or more of a coil spring, a leaf spring, a micro block spring, a rubber material, a sponge material, an elastic member, a damper, etc. The damper can be implemented as a hydraulic system, a solid friction system, or a fluid friction system. The side guard connecting unit 142 can be made of a softer material than the side guard 140 or the footrest 112. In addition, the buffer member provided inside the side guard connecting unit 142 can be implemented with various materials or structures capable of absorbing impact. Through the buffer member or structure of the side guard connecting unit 142, the PMD can be protected from external impact.

[0037] The side guard connecting unit 142 according to an embodiment of the disclosure includes a plurality of holes for absorbing impact. Due to the plurality of holes, each side guard connecting unit 142 can be easily crushed when impact is applied to the side guard 140. On the other hand, due to the plurality of holes, the side guard connecting unit 142 can be elastic in various directions. The side guard connecting unit 142 can mitigate impact applied to the footrest 112 through crushing or elasticity. In addition, the side guard connecting unit 142 can be made of a softer material than the material of the side guard 140 or the footrest 112.

[0038] The shaft guard 120 according to an embodiment of the disclosure is configured to be rotatable about a second rotation axis passing through the shaft guard 120 and the steering shaft 104. The shaft guard 120 is disposed in parallel to the steering shaft 104 to protect the PMD and the occupant from external impact. When the shaft guard 120 is disposed perpendicular to the steering shaft 104, the handle 102 and the steering shaft 104 can be protected even when the PMD falls sideways. Even when the PMD is tilted, the length of the shaft guard 120 is long enough to protect the handle 102.

[0039] Figure 1A is a perspective view of a PMD with guards according to an embodiment of the disclosure.

[0040] Referring to Figure 1A The side guard 140 according to an embodiment of the disclosure can have a curved shape along the length direction of the footrest 112.

[0041] Specifically, the central portion of each side guard 140 is configured to face in the opposite direction of the footrest 112. The two sides of the side guard 140 along the length direction of the footrest 112 are configured to face the footrest 112.

[0042] The curved side guard 140 first mitigates impact, and the side guard connecting unit 142 secondarily mitigates impact.

[0043] By forming the side guard 140 in a curved shape, various impacts can be effectively mitigated.

[0044] Figure 2A 、 2B and 2C are front views of a PMD having a guard according to an embodiment of the disclosure.

[0045] Referring to Figure 2A 、 2B and 2C, the PMD includes a handle 102, a steering shaft 104, a footrest 112, a front wheel 114, a shaft guard 120, a front guard 130, a side guard 140, a side guard connection unit 142, a first rotation axis 200, and a ground 210.

[0046] Referring to Figure 2A and Figure 2A , without the side guard 140, a great impact can be applied to the handle 102 when the PMD falls down. On the other hand, when the side guard 140 is provided, even if the PMD is tilted or falls down laterally, the contact area between the side guard 140 and the ground 210 is large, and thus the impact applied to the PMD can be mitigated.

[0047] Referring to Figure 2A , the side guard 140 and the side guard connection unit 142 can function as a kickstand, a support stand, or a rest stand of the PMD.

[0048] The side guard connection unit 142 can be configured to be rotatable with respect to the footrest 112 about the first rotation axis 200 parallel to the length direction of the footrest 112. Through the rotation of the side guard connection unit 142, the side guard 140 can be spaced apart from the ground 210 and function as a guard during traveling. Through the rotation of the side guard connection unit 142, the side guard 140 can function as a kickstand against the ground 210 when the PMD is stopped. Through these functions, the PMD can improve safety, utilization, and driving performance.

[0049] Figure 3A 、 Figure 3A and Figure 3A are plan views of a PMD having a guard according to an embodiment of the disclosure.

[0050] Referring to Figure 3A , the PMD includes a handle 102, a steering shaft 104, a fixing unit 106, a footrest 112, a front wheel 114, a rear wheel 116, a shaft guard 120, a front guard 130, a side guard 140, a side guard connection unit 142, a rear guard 150, and a rear guard connection unit 152.

[0051] The inside of the side guard connecting unit 142 according to an embodiment of the disclosure can be provided with a buffer member or a structure for buffering. The buffer member can be made of various materials capable of absorbing an impact.

[0052] Referring to Figure 4 Each side guard connecting unit 142 can include a first frame 300, a second frame 310, a buffer member 320, and a fixing unit 330.

[0053] The second frame 310 is disposed at one side of the first frame 300 and the footrest 112 is disposed at the other side. The first frame 300 is disposed at one side of the second frame 310 and the side guard 140 is disposed at the other side.

[0054] The inside between the first frame 300 and the second frame 310 is blocked.

[0055] The buffer member 320 can be disposed on the blocked surface between the first frame 300 and the second frame 310.

[0056] The fixing unit 330 is disposed in the second frame 310 and is disposed adjacent to the buffer member 320. Here, the fixing unit 330 can be implemented as a rivet, a bolt, or the like.

[0057] When an impact is applied to the side guard 140, the first frame 300 and the second frame 310 are subjected to a compressive force. The impact can be mitigated by the first frame 300, the buffer member 320, and the fixing unit 330. Specifically, the first frame 300 and the fixing unit 330 are subjected to a force in the direction of the buffer member 320, and the buffer member 320 absorbs the impact by tearing, breaking, or elasticity.

[0058] Meanwhile, referring to Figure 4 , the side guard connecting unit 142 also has a plurality of holes 340 for absorbing an impact.

[0059] When an impact is applied to the side guard 140, the first frame 300 and the second frame 310 are subjected to a compressive force. At this time, the impact can be mitigated by the first frame 300 and the second frame 310 including the plurality of holes 340.

[0060] Due to the plurality of holes 340, the elasticity of the first frame 300 and the second frame 310 increases or is easily twisted. The flattening and / or elasticity of the first frame 300 and the second frame 310 can mitigate the impact applied to the footrest 112.

[0061] Figure 4 is a perspective view for explaining the rotation of the shaft guard according to an embodiment of the disclosure.

[0062] Referring toFigure 5A The PMD includes a steering unit 100, a handle 102, a steering shaft 104, a fixing unit 106, a foot pedal unit 110, a foot pedal 112, a front wheel 114, a rear wheel 116, a shaft guard 120, a shaft guard connection unit 122, a front guard 130, a front guard connection unit 132, a side guard 140, a side guard connection unit 142, a rear guard 150, and a rear guard connection unit 152.

[0063] According to an embodiment of the disclosure, the shaft guard 120 can be configured to be rotatable about a second rotation axis passing through the shaft guard 120 and the steering shaft 104. Here, the second rotation axis is a virtual axis perpendicular to the steering shaft 104. This rotation can be performed manually or electronically.

[0064] In Figure 5A , the shaft guard connection unit 122 connects the shaft guard 120 and the steering shaft 104. In other words, the shaft guard 120 is disposed at one side of the shaft guard connection unit 122, and the steering shaft 104 is disposed at the other side. In this case, the length direction of the shaft guard connection unit 122 can be the second rotation axis.

[0065] The shaft guard 120 is fixed to the shaft guard connection unit 122 and rotatable therewith. On the other hand, the shaft guard connection unit 122 is fixed to the steering shaft 104 and only the shaft guard 120 is rotatable.

[0066] The shaft guard 120 is disposed in parallel to the steering shaft 104 to protect the PMD from external impact. In addition, the shaft guard 120 can mitigate external impact on the occupant, and can also mitigate impact on the pedestrian.

[0067] When the shaft guard 120 is disposed perpendicular to the steering shaft 104, the handle 102 can be protected even if the PMD falls sideways. In order to protect the handle 102, the shaft guard 120 must be longer than the handle 102.

[0068] Figure 5A 、 Figure 5A 、 Figure 5A and Figure 5A is a diagram of a PMD 500 with guards according to another embodiment of the disclosure.

[0069] Referring to Figure 5A 、 Figure 5A 、 Figure 1A and Figure 5A , the PMD includes a front guard 510, a front guard connection unit 512, a side guard 520, a side guard connection unit 522, a rear guard 530, and a rear guard connection unit 532.

[0070] The PMD 500 according to an embodiment of the disclosure includes a frame unit, a steering unit, and a side guard 520. The basic structure of the PMD 500 is similar to ​ the structure and skeleton of the PMD shown. However, there is a difference between the footrest and the vehicle body frame. However, the features of the side guard 520, the front guard 510, the rear guard 530, and the axle guard are the same.

[0071] The frame unit includes a vehicle body frame (not shown), a front wheel disposed in front of the vehicle body frame, and a rear wheel disposed behind the front wheel in the vehicle body frame.

[0072] The vehicle body frame can be located inside the vehicle body cover. The vehicle body frame can be divided into a main frame and a rear frame. Since the shape of the vehicle body frame should be obvious to those skilled in the art, a detailed description of the vehicle body frame is omitted.

[0073] In addition, the vehicle body frame can be protected by the vehicle body cover. The user can put his feet on the footrest of the vehicle body cover.

[0074] The side guard 520 can be connected to the footrest of the vehicle body cover or the vehicle body frame.

[0075] The steering unit includes a steering shaft (not shown), a fixing unit (not shown) connecting the steering shaft and the frame unit, and a handlebar disposed at one end of the steering shaft.

[0076] The fixing unit is configured to connect the steering shaft and the frame unit. The fixing unit can be configured to connect the front wheel to the vehicle body frame or the steering shaft. For example, the fixing unit can be a hinge.

[0077] The side guard 520 includes a side guard disposed on both sides of the vehicle body frame and extending in the length direction of the vehicle body frame.

[0078] The PMD 500 according to an embodiment of the disclosure can include some or all of the front guard 510, the side guard 520, and the rear guard 530, without the axle guard.

[0079] The front guard 510 is disposed adjacent to the front wheel and is configured to protect the front wheel. The rear guard 530 is disposed adjacent to the rear wheel and is configured to protect the rear wheel.

[0080] The front guard 510 is connected to the axle of the front wheel through a front guard connection unit 512. The rear guard 530 is connected to the axle of the rear wheel through a rear guard connection unit 532.

[0081] According to an embodiment of the disclosure, a cross section of the side guard 520 cut in a direction perpendicular to the length direction of the vehicle body frame has a sector shape including a curved area, and the curved area of the sector shape is configured to face an opposite direction of the ground side.

[0082] According to the cross-sectional shape of the side guard 520, when the PMD 500 is tilted, a contact area between the side guard 520 and the ground is enlarged (e.g., increased), so that an impact applied to the PMD 500 can be mitigated.

[0083] The cross section of the side guard 520 according to another embodiment of the disclosure can be implemented in any form capable of enlarging an area of contact with the ground when the PMD is tilted laterally.

[0084] According to an embodiment of the disclosure, the side guard 520 is curved in the length direction of the vehicle body frame.

[0085] According to one embodiment of the disclosure, the PMD 500 further includes a side guard connecting unit 522 connecting the vehicle body frame and each side guard 520.

[0086] Each side guard connecting unit 522 is configured to be rotatable with respect to the vehicle body frame about a first rotation axis parallel to the length direction of the vehicle body frame.

[0087] According to an embodiment of the disclosure, an inside of each side guard connecting unit 522 is provided with a buffer member.

[0088] According to an embodiment of the disclosure, each side guard connecting unit 522 includes a plurality of holes for absorbing an impact.

[0089] Referring to ​ , the inside of the side guard connecting unit 522 according to an embodiment of the disclosure can be provided with a buffer member or a structure for buffering. Here, the buffer member can include one or more of a coil spring, a leaf spring, a micro block spring, a rubber material, a sponge material, an elastic member, a damper, etc. The damper can be implemented as a hydraulic system, a solid friction system, or a fluid friction system.

[0090] According to an embodiment of the disclosure, the side guard connecting unit 522 can be made of a material softer than that of the side guard 520 or the footboard. In addition, the buffer member provided inside the side guard connecting unit 522 can be implemented with various materials or structures capable of absorbing an impact. Through the buffer member or structure of the side guard connecting unit 522, the PMD can be protected from external impacts.

[0091] The side guard connection unit 522 according to an embodiment of the disclosure includes a plurality of holes for absorbing an impact. Due to the plurality of holes, each side guard connection unit 522 can be easily crushed when an impact is applied to the side guard 520. On the other hand, due to the plurality of holes, the side guard connection unit 522 can be elastic in various directions. The side guard connection unit 522 can mitigate an impact applied to the footrest by crushing or elasticity.

[0092] According to an embodiment of the disclosure, the PMD 500 can further include a shaft guard disposed in front of the steering shaft. The shaft guard can extend in a length direction of the steering shaft.

[0093] The shaft guard can be configured to be rotatable about a second rotation axis passing through the shaft guard and the steering shaft.

[0094] While the embodiments of the disclosure have been described for illustrative purposes, it will be appreciated by those skilled in the art that various modifications, additions and substitutions are possible, without departing from the idea and scope of the disclosure. Therefore, the embodiments of the disclosure have been described. The scope of the technical idea of the present embodiment is not limited by the illustration. For example, the PMD can include a side guard, a part of which is disposed on both sides of the PMD, or can include separate side guards on both sides of the PMD. The description of the side guard on both sides of the PMD or on both sides of the PMD is intended to include both possibilities. Therefore, it will be appreciated by those skilled in the art that the scope of the disclosure should not be limited by the above explicitly described embodiments, but by the claims and their equivalents.

[0095] As described above, according to an embodiment of the disclosure, a passenger can be protected from an external impact and an impact of a collision with a pedestrian, thereby protecting the passenger and the pedestrian.

[0096] As described above, according to another embodiment of the disclosure, a PMD can be protected from an impact applied to the PMD when the PMD collides with an external object or falls down.

[0097] As described above, according to another embodiment of the disclosure, not only a passenger, a pedestrian, and a PMD can be protected, but also drivability and usability of the PMD can be improved.

Claims

1. A personal mobility device (PMD) comprising: a footboard unit including a footboard, a front wheel disposed on the footboard, and a rear wheel disposed behind the front wheel on the footboard; a steering unit including a steering shaft, a fixing unit connecting one end of the steering shaft and the footboard unit, and a handlebar disposed at the other end of the steering shaft; side guards disposed at both sides of the footboard unit and extending in a length direction of the footboard; and a side guard connecting unit connecting the footboard and each side guard, wherein each side guard connecting unit is configured to rotate with respect to the footboard about a first rotation axis parallel to the length direction of the footboard. 2.The PMD of claim 1, further comprising: a front guard disposed adjacent to the front wheel and configured to protect the front wheel; and a rear guard disposed adjacent to the rear wheel and configured to protect the rear wheel. a cross section obtained by cutting each side guard in a direction perpendicular to the length direction of the footboard has a sector shape including a curved region, and 3. The PMD of claim 1, wherein, the curved region of the sector shape is configured to face in an opposite direction to a ground side. the side guard has a curved shape in the length direction of the footboard.

4. The PMD of claim 1, wherein, 5.The PMD of claim 1, further comprising: a side guard connecting unit connecting the footboard and each side guard, wherein each side guard connecting unit is internally provided with a cushioning member. 6.The PMD of claim 1, further comprising: a side guard connecting unit connecting the footboard and each side guard, wherein each side guard connecting unit has a plurality of holes for absorbing impact. 7.The PMD of claim 1, further comprising: a shaft guard disposed in front of the steering shaft and extending in the length direction of the steering shaft. 8.The PMD of claim 7, wherein the shaft guard is configured to rotate about a second rotation axis passing through the shaft guard and the steering shaft. 9.A personal mobility device (PMD) comprising: a frame unit including a body frame, a front wheel disposed in front of the body frame, and a rear wheel disposed behind the front wheel in the body frame; a steering unit including a steering shaft, a fixing unit connecting the steering shaft and the frame unit, and a handlebar disposed at one end of the steering shaft; side guards disposed at both sides of the body frame and extending in a length direction of the body frame; and a side guard connecting unit connecting the body frame and each side guard, wherein each side guard connecting unit is configured to rotate with respect to the body frame about a first rotation axis parallel to the length direction of the body frame. a cross section obtained by cutting each side guard in a direction perpendicular to the length direction of the body frame has a sector shape including a curved region, and 10. The PMD of claim 9, wherein, the curved region of the sector shape is configured to face in an opposite direction to a ground side. The curved region of the fan shape is configured to face in an opposite direction to a ground-facing side.

11. The PMD of claim 9, wherein, Each side guard has a curved shape in a length direction of the vehicle body frame.

12. The PMD of claim 9, further comprising: a side guard connecting unit connecting the vehicle body frame and each side guard, wherein each side guard connecting unit is internally provided with a cushioning member.

13. The PMD of claim 9, further comprising: a side guard connecting unit connecting the vehicle body frame and each side guard, wherein each side guard connecting unit includes a plurality of holes for absorbing impact.

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