Tilting structure of a mobility device and mobility device with the same

Abstract

Tilting structure of a mobility device, the tilting structure comprising: a base frame (100); front wheel assemblies (200) mounted on opposite front sides of the base frame (100) and coupled to the base frame (100) by front wheel shift sections (210) extending in a first predetermined direction; a tilting rod (400) coupled to the base frame (100) to be tiltable with respect to a tilting center (410) positioned on a section of the tilting rod (400) to a first opposite side and a second opposite side of the base frame (100), a first side of the tilting rod (400) branching and extending to the first and second opposite sides; and front wheel rotary gears (600) connected to the first and second opposite sides, respectively.second opposing end sections (440) are engaged which branch off from the first side of the tilting rod (400) to be rotated in the same direction in which the tilting rod (400) is tilted with respect to the tilting center (410), the front wheel rotary gears (600) being engaged with the front wheel shift gear sections (210) and being rotated to move the front wheel shift gear sections (210) relative to each other in the first predetermined direction with respect to the base frame (100).

Description

BACKGROUND OF THE INVENTIONField of the InventionThe present invention relates to a tilting structure of a mobility device and a mobility device including the tilting structure, and more particularly to a structure capable of realizing tilting of a person mobility device during a turn.DESCRIPTION OF THE RELATED ARTRecently, individual mobility devices have become very popular, and interest in small vehicles and bicycles with three or four wheels has been increasing. A mobility device has been put on the market in various forms, and they are operated using a driving method in which a passenger directly operates a pedal and a driving method using fossil fuel energy or electric energy.Such a mobility device is light in weight and has a high center of gravity, and therefore, rollover of the mobility device is easily caused during turning. Therefore, in order to improve driving stability, a structure configured to steer the wheels and tilt the wheels is required.In the case of a vehicle, a device that actuates a separate actuator for tilting the wheels during turning is mounted in the vehicle. However, this device increases the weight and cost of the personal mobility device due to a complicated structure thereof, and thus there is a problem that it is difficult to apply the device to the personal mobility vehicle.WO 2014 / 006 573 A1 discloses a tiltable vehicle having at least three wheels, two of which are steerable and arranged on the same axle, having a steering rod which is fastened to the frame, two lateral head tubes, to which two lateral steering tubes, to which the steering wheels are fastened, are articulated; A means for transferring steering motion from the steering rod to the steering wheels, wherein a first pinion is fixedly connected to the frame and two further pinions configured to rotate with axes parallel to the first pinion are fixedly connected to the lateral head tubes, wherein the relative position of the axes of the first and the two further pinions is defined by a rigid cross-rod to which the first and the two further pinions are rotatably attached, and the vehicle further comprises means for transferring motion from the first pinion to the two further pinions.Furthermore, US 2018 / 0 319 242 A1 shows a three-wheeled motor vehicle with a lockable tilting mechanism. The tilting mechanism is configured to tilt the vehicle at any angle without the need for a driver to place their feet on the ground outside the vehicle. The tilting mechanism is further configured to lock the tilting of the vehicle at any desired angle by the driver. The driver is allowed to change the inclination from inside the vehicle when the inclination is locked in an undesired position. The tilting mechanism is further configured such that the driver can lock or unlock the inclination of the vehicle in a manner that allows the driver to intuitively switch between steering and counter steering.BRIEF SUMMARYIt is therefore an object to provide a structure for implementing tilting of a mobility device by a simple structure without an actuator. The object is achieved by a tilting structure having the features of claim 1.In various aspects of the present invention, there is provided a tilting structure of a mobility device, the tilting structure including: a base frame; front wheel frames mounted on opposite front sides of the base frame and coupled to the base frame through front wheel shift gear portions extending in vertical directions; a tilting bar coupled to the base frame to be transversely tiltable with respect to a tilting center positioned at a portion of the tilting bar, wherein a first side of the tilting bar is branched and extends to opposite sides; and front wheel rotation gears engaged with first and second opposite end portions branched from the first side of the tilt rod to be rotated in the same direction in which the tilt rod is tilted, and engaged with the front wheel transmission portions and rotated, and thus move the front wheel transmission portions relative to each other in the vertical directions with respect to the base frame.A link extending upward from the base frame may be fixed to the base frame and have a shape extending in a longitudinal direction of the base frame to form the tilting center at which the tilting rod is tilted, and the tilting rod may be coupled to the link to be tiltable to the opposite sides.Each front wheel rotation gear may extend in a longitudinal direction of the base frame and be coupled to the base frame to be rotatable on an axis of the extending direction thereof.The opposite end portions branched from the first side of the tilt rod may be provided with tilt gears engaged with the respective front wheel rotation gears, and the front wheel rotation gears may be rotated by a movement of the tilt gears while the tilt rod is tilted.The tilt gears may be mounted on the opposite end portions branched from the first side of the tilt rod and extend in a circumferential direction of the tilt rod inclined with respect to the tilt center.A second side of the tilt bar may extend upward and be bent rearward.The tilt structure may further include: a handlebar extending from an upper portion of the tilt center in a longitudinal axis of the tilt bar and connected to front wheels to laterally rotate the front wheels while the handlebar is rotated on an axis of the extending direction thereof; and the handlebar may be coupled to the tilt bar to be rotatable relative to the tilt bar on the axis of the extending direction thereof.The tilt rod may be configured as a hollow shaft having a space therein, and the steering rod may be connected to the tilt rod to be rotatable relative to the tilt rod by being inserted into the space.The handlebar may include a coupling bolt protruding from an outer surface of the handlebar and extending to an outer side by passing through the tilt rod, and the tilt rod may include a through hole through which the coupling bolt passes, the through hole extending along a travel path of the coupling bolt depending on a relative rotation of the handlebar.The tilting structure may further include: steering shafts extending in the vertical directions, spaced apart from the front wheel frames to which axles of the front wheels are coupled in a longitudinal direction of the base frame, and the front wheel frames rotate in the lateral direction while the steering shafts may be moved in the lateral direction; and steering links extending from the coupling bolt to opposite sides and coupled to the respective steering shafts and moved by a rotation of the steering rod in the lateral direction.A steering handle may be provided on an upper end portion of the handlebar to extend in a planar direction perpendicular to the longitudinal direction of the handlebar.The tilt structure may further include: rear wheel racks mounted on opposite rear sides of the base frame and coupled to the base frame through rear wheel shift gear portions extending in vertical directions; and rear wheel rotation gears engaged with the rear wheel shift gear portions and rotated, and thus, move the rear wheel shift gear portions relative to each other in the vertical directions with respect to the base frame.The rear wheel rotation gears provided on the opposite rear wheel frames, respectively, may be connected to each other to be rotated in conjunction with each other.The rear wheel rotation gears may extend in a longitudinal direction of the base frame, be coupled to the base frame to be rotatable on axes of the extending directions thereof, and have first bevel gears respectively at front end portions or rear end portions thereof, and the tilting structure may further include: second bevel gears having axes perpendicularly engaged with axes of the first bevel gears; and a bevel gear shaft connecting the opposing second bevel gears to each other such that the opposing second bevel gears may be rotated in conjunction with each other.According to the tilting structure of the mobility device, intuitive tilting can be realized by only a simple structure without having the actuator.The tilting may be controlled independently of the steering of the mobility device.The opposing front wheels are moved equi-widely in opposing directions so that the opposing wheels can be tilted at the same angle.The rear wheels have a structure configured to be inclined with respect to the base frame such that the rear wheels are inclined in association with the inclination of the front wheels and the base frame can be prevented from being distorted.The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present invention.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a perspective view showing a mobility device according to an exemplary embodiment of the present invention. FIG. 2 is a perspective view showing a front portion of the mobility device according to the exemplary embodiment of the present invention. FIG. 3 is a front view showing the mobility device according to the exemplary embodiment of the present invention.FIGS. 4, 5, and 6 are views schematically illustrating a tilting process of the mobility device according to the exemplary embodiment of the present invention. FIG. 7 is a view showing a coupling state of a tilt pole and a handlebar of the mobility device according to the exemplary embodiment of the present invention. FIG. 8 is a view showing a connection state of the handlebar according to the exemplary embodiment of the present invention. FIG. 9 is a perspective view showing a rear portion of the mobility device according to the exemplary embodiment of the present invention. FIG. 10 is a plan view showing the rear portion of the mobility device according to the exemplary embodiment of the present invention.It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention included herein and including, for example, certain dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.In the figures, throughout the various figures of the drawing, reference numerals refer to the same or equivalent portions of the present invention.DETAILED DESCRIPTIONReference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the present invention(s) will be / will be described in connection with exemplary embodiments of the present invention, it will be understood that the present description is not intended to limit the present invention(s) to these exemplary embodiments. On the other hand, the present invention(s) is(are) intended to cover not only the exemplary embodiments of the present invention, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the present invention, which are defined by the appended claims.Specific structural and functional descriptions of an exemplary embodiment of the present invention included herein are provided for illustrative purposes of the exemplary embodiment of the present invention only. The present invention may be embodied in various forms without departing from the spirit and significant characteristics of the present invention. Therefore, the exemplary embodiment of the present invention is included for illustrative purposes only and should not be construed to limit the present invention.Reference will now be made in detail to the exemplary embodiment of the present invention, specific examples of which are illustrated in the accompanying drawings and described below, since the exemplary embodiment of the present invention may be variously modified in various forms. Although the present invention will be described in conjunction with an exemplary embodiment thereof, it should be understood that the present description is not intended to limit the present invention to the exemplary embodiment of the present invention. On the other hand, the present invention is directed to covering not only the exemplary embodiment of the present invention but also various alternatives, modifications, equivalents and other embodiments that may be included within the spirit and scope of the present invention defined by the appended claims.It will be understood that although the terms "first / first / first", "second / second / second", etc. may be used herein to describe various elements, these elements may not be limited by these terms. These terms are used only to distinguish one element from another element. For example, without departing from the teachings of the present invention, a first element discussed below could be referred to as a second element. Similarly, the second element could also be referred to as the first element.It will be appreciated that when an element is referred to as being "coupled" or "connected" to another element, it may be directly coupled or connected to the other element, or intervening elements may be present therebetween. In contrast, it may be appreciated that when an element is referred to as being "directly coupled" or "directly connected" to another element, there are no intervening elements present. Other terms explaining the relationship between elements, such as "between", "directly between", "adjacent to", or "directly adjacent to", should be construed in the same manner.The terminology used herein is for the purpose of describing various exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms "a / an" and "the / s" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the terms "comprise," "include," "have," etc., when used in the exemplary embodiment, specify the presence of stated features, integers, steps, operations, elements, components, and / or combinations thereof, but do not preclude the presence or addition of one / more other features, integers, steps, operations, elements, components, and / or combinations thereof.Unless otherwise defined, all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Further, it will be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with the meaning thereof in the context of the relevant art and the present invention, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. Throughout the drawings, the same reference numerals will refer to the same or similar parts.FIG. 1 is a perspective view showing a mobility device 1000 according to an exemplary embodiment of the present invention. FIG. 2 is a perspective view showing a front portion of the mobility device 1000 according to the exemplary embodiment of the present invention. FIG. 3 is a front view showing the mobility device 1000 according to the exemplary embodiment of the present invention.Referring to FIGS. 1, 2, and 3, according to the exemplary embodiment of the present invention, a tilting structure of the mobility device 1000 includes: a base frame 100; front wheel racks 200 mounted on opposite front sides of the base frame 100 and coupled to the base frame 100 through front wheel shift gear portions 210 extending in vertical directions; a tilt bar 400 coupled to the base frame 100 to be tiltable to opposite sides with respect to a tilt center 410 fixed to an upper portion of the base frame 100, wherein a first side of the tilt bar 400 is branched and extends to opposite sides; and front wheel rotation gears 600 connected to respective opposite end portions 440 branched from the first side of the tilt rod 400 to be tiltable in the same direction as the tilt rod 400 when the tilt rod is inclined transversely, and engaged with the front wheel transmission gear portions 210 and inclined, thus moving the front wheel transmission gear portions 210 relative to each other in the vertical directions with respect to the base frame 100.The base frame 100 is formed into a shape of a plate extending parallel to the floor, and may have a passenger compartment on an upper portion thereof.According to an exemplary embodiment of the present invention, the mobility device 1000 may further include a driving portion 900 for driving a front wheel 220 or a rear wheel 320 by a driving force generated by a driving source or a driving force provided by the passenger. The driving portion 900 may be a motor that generates a driving force using a power source such as electricity, may be supplied with a driving force by stepping the pedals by the passenger as in the case of bicycling, or may be a hybrid drive system including both the driving by both the passenger and the motor.The mobility device 1000 in an exemplary embodiment of the present invention may be a mobility device 1000 driven by four wheels including two front wheels 220 and two rear wheels 320. Drive wheels may include the front wheels 220, the rear wheels 320, or an all-wheel drive (AWD). All wheel drive).The front wheel frames 200 may be mounted on opposite front sides of the base frame 100. The front wheels 220 may be rotatably coupled to the respective front wheel frame 200. Axles of the front wheels 220 may be coupled to side surfaces of the front wheel racks 200.The front wheel racks 200 include the front wheel shift gear portions 210 that extend in vertical directions, respectively. The front wheel racks 200 are coupled to the base frame 100 through the front wheel shift gear portions 210, and thus can perform relative movement in vertical directions. The front wheel frames 200 may further include suspensions such as a spring and a shock absorber, and may be coupled to the front wheels 220 through the suspensions.Each front wheel shift gear portion 210 may have teeth along the vertical direction to be engaged with each of the front wheel rotation gears 600.The tilt rod 400 may be coupled to the base frame 100 to be tiltable to opposite sides with respect to the tilt center 410 fixed to the base frame 100. The tilt rod 400 may be branched from a lower portion of the tilt center 410 to the opposite sides, and branched end portions may extend to the respective front wheel frame 200.The front wheel rotation gears 600 may be respectively engaged with the front wheel opposite gear portions 210 and connected to the opposite end portions 440 branched from the first side of the tilt rod 400. Consequently, while the tilt rod 400 is tilted in the lateral direction, the opposed front wheel rotation gears 600 can be rotated in the same direction as the tilt rod 400. Consequently, the front wheel rotation gears 600 are rotated in the same direction thereof and can move the opposite front wheel shift gear portions 210 relative to each other with respect to the base frame 100.Consequently, while the tilt rod 400 is tilted transversely with respect to the tilt center 410, the front-wheel opposite gear portions 210 are moved equi-widely in opposite directions to each other, while tilting of the front wheels can be implemented.FIGS. 4, 5, and 6 are views schematically illustrating a tilting process of the mobility device 1000 according to the exemplary embodiment of the present invention.Referring to FIGS. 4, 5, and 6, when the tilt rod 400 of the mobility device 1000 is inclined transversely with respect to the tilt center 410, the differential displacement is generated between the opposing front wheels 220 as shown in FIG. 5.Assuming that the base frame 100 is held parallel to the ground, the tilt rod 400 rotates the front-left and right wheel rotation gears 600 counterclockwise while being tilted clockwise.Consequently, a front left wheel transmission portion 210 is moved downward and a front right wheel transmission portion 210 is moved upward.However, the opposite front wheels 220 are actually all in contact with the ground by the load applied to the base frame 100, as shown in FIG. 6. Consequently, there is an effect that the opposing front wheels 220 and the base frame 100 are inclined by the differential displacement between the opposing front wheels 220.Referring again to FIGS. 1, 2, and 3, the base frame 100 may be provided with a link 110, the link 110 extending upward and having a shape extending in a longitudinal direction of the base frame to form the tilting center 410 at which the tilting rod 400 is tilted. The tilt rod 400 may be coupled to the link 110 to be tiltable to the opposite sides.The link 110 may be fixed to the base frame 100 and have the shape that extends upward from the base frame 100 and extends longitudinally at a position of the tilt center 410. The tilt rod 400 may be coupled to the link 110 at the position of the tilt center 410 to be tiltable to the opposite sides.Therefore, while the tilt rod 400 is tilted transversely from an upper portion of the tilt center 410, rotation of the front wheel rotation gears 600 and movement of the front wheel transmission gear portions 210 can be realized depending on the rotation from the lower portion of the tilt center 410.The front wheel rotation gears 600 extend in a longitudinal direction of the base frame and may be coupled to the base frame 100 to be rotatable on axes of the extending directions thereof. That is, the positions of the front wheel rotation gears 600 are fixed to the base frame 100, and the front wheel rotation gears 600 may be coupled to the base frame 100 to be rotatable on the axes extending in the longitudinal directions, and the front wheel shift gear portions 210 may move relative to each other with respect to the base frame 100.The opposite end portions 440 branched from the first side of the tilt rod 400 are provided with tilt gears 420 that engage with the front wheel rotation gears 600. While the tilt rod 400 is tilted, the front wheel rotation gears 600 can be rotated by movements of the tilt gears 420.The tilt gears 420 are positioned at the branched end portions of the tilt rod 400, and can be rotated sideways of the tilt rod 400 by tilting the tilt rod 400.On the opposite end portions 440 branched from the first side of the tilt rod 400, the tilt gears 420 engaged with the front wheel rotation gears 600 are provided, so that the front wheel rotation gears 600 can be rotated by the movements of the tilt gears 420 while the tilt rod 400 is tilted.Consequently, the tilt gears 420 can transmit tilting motion of the tilt rod 400 as rotational motions of the front wheel rotation gears 600.The tilt gears 420 may extend from the opposite end portions 440 branched from the first side of the tilt rod 400 in a circumferential direction of the tilt rod 400 inclined with respect to the tilt center 410.That is, the tilt gears 420 may extend along moving paths of the opposite end portions 440 due to tilting of the tilt rod 400, and each have gear teeth along the extending direction thereof, the gear teeth being meshed with each of the front wheel rotation gears 600. Consequently, even when the tilt rod 400 is tilted, there is an effect that the tilt gears 420 can maintain the engagement with the front wheel rotation gears 600.A second side of the tilt bar 400 may extend upward and be bent rearward. The tilt rod 400 may extend upward and be inclined rearward from the upper portion of the tilt center 410.Consequently, a rider can easily tilt the tilt bar 400 in the transverse direction while being accommodated in the passenger compartment.FIG. 7 is a view showing a coupling state of the tilt bar 400 and a handlebar 500 of the mobility device 1000 according to the exemplary embodiment of the present invention. FIG. 8 is a view showing a connection state of the handlebar 500 according to the exemplary embodiment of the present invention.Referring to FIGS. 7 to 8, the tilting structure of the present invention further includes the handlebar 500. The steering rod 500 extends from the upper portion of the center of tilt 410 in parallel to the tilt rod 400 and is connected to the front wheels 220 to steer the front wheels 220 in the lateral direction while the steering rod 500 is steered on an axis of a direction of extension thereof. Here, the handlebar 500 may be coupled to the tilt rod 400 to be controlled relative to the tilt rod 400 on the axis of the extending direction thereof.As the exemplary embodiment of the present invention, the tilt rod 400 may be configured as a hollow shaft having a space therein, and the handlebar 500 may be coupled to the tilt rod 400 to be controlled relative to the tilt rod 400 by being inserted therein.The tilt rod 400 may be coupled to the handlebar 500 to be tilted relative thereto, and the handlebar 500 may be moved while being inserted into the tilt rod 400.Further, a steering handle 510 may be provided on an upper end portion of the steering rod 500, the steering handle 510 extending in a planar direction perpendicular to the longitudinal direction of the steering rod 500.The handlebar 500 extends to the outside and not an end portion of a second side of the tilt bar 400, and the steering handle 510 may be coupled to an end portion of the handlebar 500 extending to the outside and not the end portion of a second side of the tilt bar 400.Consequently, the rider controls the steering handle 510 rotated integrally with the handlebar 500 on an axis of the longitudinal direction of the handlebar 500 to steer the mobility device 1000. Further, while the driver transversely controls the steering handle 510, the tilt rod 400 is transversely tilted based on the tilt center 410, so that the tilting of the front wheels 220 can be implemented.The handlebar 500 is provided with a coupling bolt 520, the coupling bolt 520 protruding from an outer surface of the handlebar 500 and extending to the outside while passing through the tilt rod 400. The tilt rod 400 is provided with a through hole 430 through which the coupling bolt 520 passes, and the through hole 430 may extend along a movement path of the coupling bolt 520 depending on a relative movement of the handlebar 500.The coupling bolt 520 protruding on the outer surface of the handlebar 500 may extend perpendicular to the longitudinal direction of the handlebar 500. The coupling bolt 520 may be rotated integrally with the handlebar 500 along a steering direction of the handlebar 500.The coupling pin 520 passes through the through hole 430 provided on the tilt rod 400, and the through hole 430 may extend along the movement path of the coupling pin 520 depending on the relative rotation of the handlebar 500.The tilting structure of the present invention may include: steering shafts 530 extending in vertical directions, spaced apart from the front wheel racks 200 to which the axles of the front wheels are coupled in a longitudinal direction of the base frame, and the front wheel racks 200 rotate in the lateral direction while being moved in the lateral direction; and steering links 540 extending from the coupling bolt 520 to opposite sides and coupled to the respective steering shafts 530 and moved in the lateral direction by a control of the steering rod 500.The steering shafts 530 may extend in vertical directions and be rotatably coupled to the front wheel racks 200 to be rotated on axes of the vertical directions. The axes and the extending directions of the steering shafts 530 may be parallel to the extending direction of the front wheel frames 200.The axles of the front wheels 220 may be coupled to the front wheel racks 200, and the steering shafts 530 may be spaced from the front wheel racks 200 in the longitudinal direction thereof.The steering links 540 may connect the coupling bolt 520 to the steering shafts 530. First end portions of the steering links 540 may be movably coupled to an end portion of the coupling bolt 520, and second end portions of the steering links 540 may be movably coupled to the steering shafts 530.The end portion of the coupling bolt 520 is moved due to the control of the steering rod 500 and the coupling bolt 520, and thus the steering links 540 are moved in the lateral direction. Since the steering shafts 530 are moved in the lateral direction, the front wheel frames 200 are rotated in the lateral direction, so that the tilting of the front wheels 220 can be implemented.FIG. 9 is a perspective view showing a rear portion of the mobility device 1000 according to the exemplary embodiment of the present invention. FIG. 10 is a plan view showing the rear portion of the mobility device 1000 according to the exemplary embodiment of the present invention.Referring to FIGS. 9 and 10, the tilting structure of the present invention may include: rear wheel racks 300 mounted on opposite sides of the base frame 100 and coupled to the base frame 100 through rear wheel transmission portions 310 extending in vertical directions; and rear wheel rotation gears 700 engaged with the rear wheel transmission portions 310 and rotated, and thus move the rear wheel transmission portions 310 relative to each other in vertical directions with respect to the base frame.Axles of the rear wheels 320 may be rotatably coupled to respective sides of the rear wheel racks 300. The rear wheels 320 are not directly steered by the driver, but may be passively steered based on the steering of the front wheels 220.Also, the tilting of the rear wheels 320 is not directly controlled by the driver, but the rear wheels 320 may be passively tilted in conjunction with the tilting of the base frame 100 when the front wheels 220 are tilted.The rear wheel frames 300 may include the rear wheel shift gear portions 310 extending in the vertical directions. The rear wheel side gear portions 310 may have gear teeth along the vertical directions, respectively, to be engaged with the rear wheel side rotary gears 700.Movements of the rear wheel rotation gears 700 are fixed on the base frame 100, and the rear wheel rotation gears 700 may be rotatably coupled to the base frame 100 on axes of a longitudinal direction of the base frame.Consequently, the rear wheels 320 have a structure configured to tilt with the base frame 100, so that the base frame 100 can be prevented from being distorted due to the tilting of the front wheels 220.The rear wheel rotation gears 700 provided on opposite rear wheel frames 300 respectively may be further connected to each other to be rotated in conjunction with each other.That is, the opposing rear wheel frames 300 can be moved in opposite directions equidistant relative to the base frame 100. For example, when a left rear wheel 320 is moved downward from the base frame 100, a right rear wheel 320 may be moved upward from the base frame 100.Thus, while the base frame 100 is being tilted, the left and right rear wheels 320 are moved in association with each other and tilted at the same angle.The rear wheel rotation gears 700 extend in the longitudinal direction of the base frame, are rotatably coupled to the base frame 100 on axes in the extending directions thereof, and have the first bevel gears 710 at front end portions and rear end portions thereof, respectively. The tilting structure of the present invention may further include: second bevel gears 810 having axes perpendicularly engaged with axes of the first bevel gears 710; and a bevel gear shaft 800 connecting the opposing second bevel gears 810 to each other such that the opposing second bevel gears 810 are rotated in conjunction with each other.The rear wheel rotation gears 700 extending in longitudinal directions are engaged with the rear wheel shift gear portions 310. The rear wheel shift gear portions 310 may be provided with the first bevel gears 710 at the front end portions or the rear end portions thereof. The first bevel gears 710 can be meshed with the second bevel gears 810 that are rotated on the axes extending sideways. The first bevel gears 710 and the second bevel gears 810 may have the axes perpendicular to each other.The second bevel gears 810 provided on the rear left wheel 320 and the rear right wheel 320, respectively, may be connected to each other by the bevel gear shaft 800 and rotated in connection with each other.Due to the rotation of the bevel gear shaft 800, the left first bevel gear 710 and the right first bevel gear 710 are meshed with the respective second bevel gear 810 and can be rotated in the same direction thereof.According to the exemplary embodiment of the present invention, the mobility device including the tilting structure of the mobility device may further include the driving portion 900, wherein the driving portion 900 drives the front wheels or the rear wheels by the driving force generated by the driving source or the driving force provided by the passenger.For convenience in explanation and accurate definition in the appended claims, the terms "upper / upper / upper", "lower / lower / lower", "inner / inner / inner", "outer / outer / outer", "upward", "downward", "upward", "downward", "front / front / front", "rear / rear / rear", "rear" or "inner", "outer", "inward", "outward", "internal / internal / internal", "external / external / external", "inner", "outer", "forward" and "rearward" are used to describe features of the exemplary embodiments with reference to the positions of such features shown in the figures.It will be further understood that the term "connect" or derivatives thereof refers to both a direct and indirect connection.The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. However, they are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the present invention and their practical application, to enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the present invention be defined by the claims appended hereto and equivalents thereof.

Claims

A tilting structure of a mobility device, the tilting structure comprising: a base frame (100); front wheel frames (200) mounted on opposite front sides of the base frame (100) and coupled to the base frame (100) through front wheel shift gear portions (210) extending in a first predetermined direction; a tilting bar (400) coupled to the base frame (100) to be tiltable to a first opposite side and a second opposite side of the base frame (100) with respect to a tilting center (410) positioned at a portion of the tilting bar (400), wherein a first side of the tilting bar (400) is branched and extends to the first and second opposite sides; A front wheel rotation gear (600) engaged with first and second opposite end portions (440) branched from the first side of the tilt rod (400), respectively, to be rotated in the same direction in which the tilt rod (400) is tilted with respect to the tilt center (410), wherein the front wheel rotation gears (600) are engaged with the front wheel transmission gear portions (210) and rotated to move the front wheel transmission gear portions (210) relative to each other in the first predetermined direction with respect to the base frame (100).The tilting structure according to claim 1, wherein a link (110) extending upward from the base frame (100) is fixed to the base frame (100) and formed to extend in a longitudinal direction of the base frame (100) to form the tilting center (410) around which the tilting rod (400) is tilted, and the tilting rod (400) is coupled to the link (110) to be tiltable to the first opposite side and the second opposite side with respect to the tilting center (410).The tilting structure according to claim 1, wherein the front wheel rotation gears (600) are each aligned in a longitudinal direction of the base frame (100) and coupled to the base frame (100) to be rotatable on axes of the front wheel rotation gears (600).The tilt structure according to claim 1, wherein the first and second opposite end portions (440) branched from the first side of the tilt rod (400) are provided with tilt gears engaged with the respective front wheel rotation gear (600), and the front wheel rotation gears (600) are rotated by a movement of the tilt gears while the tilt rod (400) is tilted.The tilting structure according to claim 4, wherein the tilting gears are mounted on the first and second opposite end portions (440) branched from the first side of the tilting rod (400) and extending in a circumferential direction of the tilting rod (400) inclined with respect to the tilting center (410).The tilt structure of claim 1, wherein a second side of the tilt rod (400) extends upward and is bent rearward from the tilt rod (400).The tilt structure of claim 1, further comprising: a handlebar (500) extending from an upper portion of the tilt center (410) in a longitudinal axis of the tilt bar (400), the handlebar (500) being connected to front wheels to laterally turn the front wheels while the handlebar is turned on an axis of the handlebar (500), the handlebar (500) being coupled to the tilt bar (400) to be rotatable relative to the tilt bar (400) on the axis of the handlebar (500).The tilting structure according to claim 7, wherein the tilting rod (400) is formed as a hollow shaft having a space therein, and the steering rod (500) is inserted into the tilting rod (400) to be rotatable relative to the tilting rod (400).The tilting structure according to claim 8, wherein the tilting bar (400) has a through hole (430), wherein the steering bar (500) has a coupling pin (520) protruding from an outer surface of the steering bar (500) through the through hole (430) of the steering bar (500) and extending to an outside of the steering bar (500) by passing through the through hole (430) of the tilting bar (400), and wherein the through hole (430) is formed to extend along a movement amount of the coupling pin (520), wherein the movement amount is an amount for the steering bar (500) to rotate relative to the tilting bar (400).The tilt structure according to claim 9, further comprising: steering shafts (530) extending in the first predetermined direction, spaced apart from the front wheel racks (200) to which axles of the front wheels are coupled in a longitudinal direction of the base frame (100), and which transversely rotate the front wheel racks (200) while transversely moving the steering shafts (530); and steering links (540) extending from the coupling bolts (520) to the first and second opposite sides and coupled to the respective steering shaft (530) and transversely moved by a rotation of the steering rod (500).The tilting structure according to claim 7, wherein a steering handle is provided on an upper end portion of the steering rod (500) to extend in a planar direction perpendicular to the axis of the steering rod (500).The tilt structure according to claim 1, further comprising: rear wheel racks (300) mounted on opposite rear sides of the base frame (100) and coupled to the base frame (100) through rear wheel transmission portions (310) extending in the first predetermined direction; and rear wheel rotation transmissions (700) engaged with the rear wheel transmission portions (310) and rotated to move the rear wheel transmission portions (310) relative to each other in the first predetermined direction with respect to the base frame (100).The tilting structure according to claim 12, wherein the rear wheel rotation gears (700) provided on the rear wheel racks (300), respectively, are connected to each other to be rotated in conjunction with each other.The tilt structure according to claim 13, wherein the rear wheel rotation gears (700) extend in a longitudinal direction of the base frame (100), are coupled to the base frame (100) to be rotatable on axles of the rear wheel rotation gears (700), and have first bevel gears (710) at respective front end portions or rear end portions thereof, the tilt structure further including: second bevel gears (810) having axles perpendicularly engaged with axles of the first bevel gears (710); and a bevel gear shaft (800) connecting the second bevel gears (810) to each other such that the second bevel gears (810) are rotated in conjunction with each other.The mobility device having the tilting structure according to claim 1, wherein the mobility device further comprises: a driving portion (900) that drives front wheels (220) or rear wheels (320) by a driving force provided by a driving source or a passenger.

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