Patent Publication Number: US-2021162291-A1

Title: Bicycle simulator

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/KR2019/004519, filed on Apr. 15, 2019, which claims priority to and the benefit of Korean Patent Application No. 10-2019-0003288, filed on Jan. 10, 2019, Korean Patent Application No. 10-2018-0106047, filed on Sep. 5, 2018, and Korean Patent Application No. 10-2018-0068394, filed on Jun. 14, 2018. The disclosures of the above applications are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a bicycle simulator for virtual rides, and more particularly, to a bicycle simulator in which various travel routes may be virtually experienced in an indoor space and exercise effects may be obtained. 
     BACKGROUND 
     In general, bicycle exercise equipment known as bicycle trainers or bicycle rollers is the most widely used indoor exercise fitness equipment along with treadmills. Here, a rider on a bicycle mounted on a rotating roller or a cradle uses pedals to rotate the wheels to which rotational resistance (magnetic force, etc.) is applied, so as to strengthen the muscles of the lower body. 
     Such bicycle exercise equipment of the related art has an advantage in that a considerably high exercise effect is provided to a rider with only a relatively short time of exercise through the adjustment of rotational resistance applied to the wheels, regardless of the weather. 
     However, with the bicycle exercise equipment of the related art, a pedaling exercise to which rotational resistance is applied is simply continued while facing the wall in an enclosed indoor space. Thus, there is a drawback in that it is difficult to continue the continuous pedaling exercise due to boredom as it is not possible to provide the rider with the pleasure of riding a real bicycle. 
     In order to improve the above problem, Prior Art 1 (Korean Patent No. 10-1677713) and Prior Art 2 (Korean Patent No. 10-1827306) disclose technologies relating to cycle exercise equipment. 
     In Prior Art 1, by replacing three or more roller portions each rotating about a fixed axis (center axis) and having different outer wall shapes, the rider may be provided with a travel experience on various road conditions, similar to riding a real bicycle, and through the interest induced thereby, the rider may continue the pedaling movement in a continuous manner. However, the cycle exercise equipment presented in Prior Art 1 rotates three or more roller portions themselves back and forth, and due to the implementation of various road surfaces, the structure is complex, and manufacturing or maintenance difficulties are expected. Further, when the roller portions rotate for the sake of changing a road surface, the bicycle itself that is being pedaled inevitably moves largely in a vertical direction, which greatly impedes the safety of the rider on the bicycle and cannot realize natural changes in the road surface. 
     In Prior Art 2, an uneven portion, which may implement a virtual road surface, protrudes along the roller portion, and thus, a safer riding experience and natural changes of the road surface may be provided to the rider. However, the cycle exercise equipment presented in Prior Art 2 only implements a flat virtual road surface, and cannot implement various travel modes according to an actual travel environment having a slope and the type of rider. 
     SUMMARY 
     The present disclosure to provide a bicycle simulator whereby a road surface having a slope is realized, while various travel modes enabling a steering range to be adjusted according to the type of rider are realized, and thus, a dynamic experience which is extremely similar to an actual riding situation may be possible. 
     According to an embodiment of the disclosure, a bicycle simulator includes a frame support portion for supporting a bicycle frame, the bicycle frame connecting front and rear wheels of the bicycle, and a base portion supporting the frame support portion, wherein the frame support portion includes a first support bar having one end portion thereof fixed to the bicycle frame, a second support bar having one end portion thereof fixed to the base portion, and a connection portion for connecting the other end portion of the second support bar and the other end portion of the first support bar, wherein the first support bar is connected to be rotatable about one axis with respect to the second support bar. 
     As the first support bar rotates with respect to the second support bar, the bicycle may be tilted at the same angle as a rotation angle of the first support bar. 
     The bicycle simulator may further include a front wheel support portion for supporting the front wheel of the bicycle and rotating together with rotation of the front wheel, and first and second rear wheel support portions that respectively support two points of the rear wheel of the bicycle and rotate together according to rotation of the rear wheel. 
     The bicycle simulator may further include a rotation controller for limiting a rotation angle of the first support bar with respect to the second support bar and restoring a position of the rotated first support bar. 
     The bicycle simulator may further include a weight-measuring portion for measuring the weight of a rider on the bicycle. 
     The connection portion may include a hinge housing provided on the first support bar and the second support bar, and a hinge shaft inserted into the hinge housing. 
     The one end portion of the first support bar may include a contact portion in contact with a portion of the bicycle frame, the contact portion being provided with an electromagnet to fix the bicycle frame to the contact portion. 
     The contact portion may have a first support surface and a second support surface, which are arranged to face each other with a preset distance therebetween, and a portion of the bicycle frame may be arranged to be inserted between the first support surface and the second support surface, and be in contact with and supported by the first support surface and the second support surface. 
     The bicycle simulator may further include a speed measuring portion for calculating a travel speed from rotation of the rear wheel, and an air-blowing device that provides variable wind to a rider according to a travel speed calculated by the speed measuring portion. 
     The bicycle simulator may further include a display device for visually providing a preset travel environment to a rider, and the first support bar may rotate about one axis with respect to the second support bar to match a slope of a travel environment provided in real time through the display device. 
     The bicycle simulator may further include a movement limiting portion arranged between the first support bar and the second support bar to prevent horizontal movement of the first support bar in the direction of the one axis with respect to the second support bar. 
     The bicycle simulator may further include a leg support portion arranged at opposite side portions of the base portion to support legs of a rider on the bicycle. 
     According to an embodiment, a bicycle simulator includes a frame support portion for supporting a frame of a mounted bicycle, the frame connecting front and rear wheels of the bicycle, a slide guide fixed to the base portion and extending in a first direction, a slide portion fixed to the frame support portion and connected to be movable in the first direction in the slide guide, and a movement interval adjustment portion for adjusting a movement interval through which the slide portion is capable of moving in the slide guide, according to a travel mode. 
     In a first travel mode, the slide portion may move along by an interval of 10 cm or more and 20 cm or less, in a second travel mode, the slide portion may move along by an interval of more than 20 cm and 40 cm or less, and in a third travel mode, the slide portion may move along by an interval of 40 cm or more. 
     The bicycle simulator may further include an input unit for inputting the first to third travel modes, and a controller for adjusting a movement interval capable of being moved in the slide guide, according to a travel mode input to the input unit. 
     The bicycle simulator may further include a front wheel support portion for supporting the front wheel of the bicycle and rotating together with rotation of the front wheel, and first and second rear wheel support portions respectively supporting two points of the rear wheel of the bicycle and rotate together according to rotation of the rear wheel. 
     As the slide portion moves in the first direction, the front wheel of the bicycle may move on an upper surface of the front wheel support portion in the first direction, and the rear wheel of the bicycle may move on upper surfaces of the first and second rear wheel support portions in the first direction. 
     The bicycle simulator may further include a rotation slide guide portion arranged on an upper portion of the slide portion and extending along a circumferential direction around a second direction that is perpendicular to the first direction, and a rotation slide portion which is arranged to be engaged with the rotating slide guide portion and rotates the frame support portion about the second direction with respect to the slide portion. 
     The bicycle simulator may further include a rotation restraint portion for limiting a rotation angle of the frame support portion with respect to the slide portion. 
     A rotation angle of the frame support portion with respect to the slide portion may be 0 degrees or more and 20 degrees or less. 
     According to the present disclosure, as a first support bar rotating about one axis with respect to a second support bar is provided on a frame support, a rider on the bicycle may virtually experience various road conditions having a slope and thus enjoy a dynamic and realistic ride. 
     In addition, a variety of travel modes, in which a steering range may be adjusted according to the type of rider, is provided, and thus, the exercise effect may be naturally maximized according to the type of the rider. 
     Further, when a weight measuring portion, a controller, a speed measuring portion, an air-blowing device, and a display device are organically coupled with each other, controlled, and operated, the rider may be provided with a more realistic and interesting virtual riding environment. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of a bicycle simulator according to an embodiment of the present disclosure; 
         FIG. 2  is a plan view of the bicycle simulator shown in  FIG. 1 ; 
         FIG. 3A  is a perspective view of a frame support portion according to the present disclosure; 
         FIG. 3B  is an exploded perspective view of the frame support portion shown in  FIG. 3A ; 
         FIG. 3C  is a perspective view of a first support bar according to another embodiment; 
         FIG. 4  is a schematic diagram of a display device in which a travelling scene having a slope is displayed, according to an embodiment of the present disclosure; 
         FIG. 5  is a front view of a bicycle simulator according to an embodiment of the present disclosure; 
         FIG. 6  is a partial schematic diagram of a frame support portion according to an embodiment of the present disclosure; 
         FIG. 7A  is a partial perspective view of a bicycle simulator according to another embodiment; 
         FIG. 7B  is a partial cross-sectional view of a bicycle simulator according to another embodiment; 
         FIG. 7C  is a partial perspective view of a bicycle simulator, according to another embodiment. 
         FIG. 8A  is a schematic plan view of a bicycle simulator according to steering of a bicycle where a front wheel may first rotate clockwise before a rear wheel; 
         FIG. 8B  is a schematic plan view of a bicycle simulator according to steering of a bicycle where the rear wheel may rotate according to the rotation of the front wheel; 
         FIG. 9A  is a schematic plan view of a bicycle simulator according to a first travel mode; 
         FIG. 9B  is a schematic plan view of a bicycle simulator according to a second travel mode; 
         FIG. 9C  is a schematic plan view of a bicycle simulator according to a third travel mode; 
         FIG. 10A  is a side view of a bicycle simulator according to another embodiment of the present disclosure; 
         FIG. 10B  is a plan view of a bicycle simulator according to another embodiment of the present disclosure; and 
         FIG. 10C  is a partial perspective view of the bicycle simulator shown in  FIG. 10A . 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Hereinafter, the embodiments of the present disclosure will now be described more fully with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements, and thus descriptions thereof will be omitted. 
     As embodiments allow for various changes, example embodiments will be illustrated in the drawings and described in detail in the written description. Effects and features of the present embodiments, and methods for achieving them will be clarified with reference to details described below in detail with reference to the drawings. However, the present embodiments are not limited to the following embodiments and may be embodied in various forms. 
     While such terms as “first,” “second,” etc., may be used to describe various components, such components are not be limited to the above terms. The above terms are used only to distinguish one component from another. 
     The singular forms “a,” “an,” and “the” as used herein are intended to include the plural forms as well unless the context clearly indicates otherwise. 
     In the following embodiments, the up (above), down (below), left and right (lateral), front (forward), rear (back), etc. that indicate directions are not intended to limit the rights, but are determined based on the drawings and a relative position between the components, for convenience of explanation. Thus, each direction described below is based on this, except for a case specifically limited otherwise. 
     In the present specification, it is to be understood that the terms “including,” “having,” and “comprising” are intended to indicate the existence of the features or components described in the specification, and are not intended to preclude the possibility that one or more other features, numbers, steps, actions, components, parts, or combinations thereof may exist or may be added. 
     Sizes of components in the drawings may be exaggerated for convenience of explanation. In other words, since sizes and thicknesses of components in the drawings are arbitrarily illustrated for convenience of explanation, the following embodiments are not limited thereto. 
       FIG. 1  is a perspective view of a bicycle simulator, according to an embodiment of the present disclosure.  FIG. 2  is a plan view of the bicycle simulator shown in  FIG. 1 .  FIG. 3A  is a perspective view of a frame support portion, according to the present disclosure.  FIG. 3B  is an exploded perspective view of the frame support portion shown in  FIG. 3A .  FIG. 3C  is a perspective view of a first support bar, according to another embodiment. 
     In a bicycle simulator  1  according to an embodiment of the present disclosure, a rider R on a bicycle  10  may virtually experience various road surface conditions having a slope, and thus, a dynamic and realistic ride may be enjoyed. In addition, a variety of travel modes, in which a steering range may be adjusted according to the type of the rider R, is provided, and thus, the exercise effect may be naturally maximized according to the type of the rider R. 
     The bicycle  10  mentioned above not only is specially manufactured for only the bicycle simulator  1  according to an embodiment of the present disclosure, but also is a concept that encompasses all bicycles  10  currently available on the market by various manufacturers. The bicycle  10  may include a bicycle frame  11  constituting the body of the bicycle  10 , a front wheel  14  and a rear wheel  12 , which are rotatably mounted on the bicycle frame  11 , and a drivetrain (crank, chain, transmission, etc.) that converts pedaling of the rider R to a rotational force of the rear wheel  12 . 
     The bicycle simulator  1  according to an embodiment of the present disclosure includes a base portion  20 , a front wheel support portion  40 , a rear wheel support portion  50 , and a frame support portion  100 , which are to implement the functions or actions as described above. 
     Each of the configurations described above will now be described below in detail. 
     Referring to  FIGS. 1 and 2 , the base portion  20  according to an embodiment of the present disclosure is a support member that may be fixed to the ground to support the bicycle  10 . As an example, the base portion  20  may be provided in the shape of a rectangular frame on which the front wheel support portion  40  and the rear wheel support portion  50  to be described later may be mounted. However, the present disclosure is not limited thereto, and an arbitrary support member on which the front wheel support portion  40  and the rear wheel support portion  50  may be mounted may be provided. In addition, in the base portion  20  according to an example, a support frame  21 , to which the frame support portion  100  may be fixed, may be arranged across the opposite side portions of the base portion  20 . 
     A leg support portion  25  may be arranged at opposite side portions of the base portion  20  to support legs of the rider R. As an example, when the rider R is stopped on the bicycle  10  before travelling, it may be difficult for the rider R to hold the center. At this time, the leg support portion  25  capable of supporting legs of the rider R may be arranged at both side portions of the base portion  20  so that the rider R may hold the center. For example, the leg support portion  25  having an inclined surface to support legs of the rider R may be provided, but the present disclosure is not limited thereto. 
     The front wheel support portion  40  is a rod-shaped component that supports the front wheel  14  of the bicycle  10  mounted on the bicycle simulator  1  and rotates together with the front wheel  14 , and the either end portions of the front wheel support portion  40  may form a shaft coupling with the base portion  20  so that the front wheel support portion  40  may freely rotate forward or backward based on the mounted bicycle  10 . 
     The rear wheel support portion  50  is a rod-shaped component that supports the rear wheel  12  of the bicycle  10  mounted on the bicycle simulator  1  and rotates together with the rear wheel  12 , and the either end portions of the rear wheel support portion  50  may form a shaft coupling with the base portion  20  so that the rear wheel support portion  50  may freely rotate forward or backward based on the mounted bicycle  10 . 
     The front wheel support portion  40  and the rear wheel support portion  50  as described above may be of any shape that may rotate together with the rotation of the front wheel  14  and the rear wheel  12  while contacting the front wheel  14  and the rear wheel  12 . Accordingly, the longitudinal sections of the front wheel support portion  40  and the rear wheel support portion  50  may each be polygonal, elliptical, or circular. At this time, the front wheel  14  and the rear wheel  12  of the bicycle  10  may freely move on the upper surfaces of the front wheel support portion  40  and the rear wheel support portion  50 , respectively. 
     As an example, the front wheel support portion  40  and the rear wheel support portion  50  according to the present disclosure may each include a circular longitudinal section as shown in  FIGS. 1 to 2 , so that smooth rotation may be possible according to the rotation of the front wheel  14  and the rear wheel  12  without a heterogeneous feeling of ride given to the rider R that rotates the front wheel  14  and the rear wheel  12 . In addition, the rear wheel support portion  50  according to the present disclosure may include two rear wheel support portions  50 , that is, a first rear roller  51  and a second rear roller  52 , which rotate while supporting the rear roller  12  back and forth from the bottom of the rear wheel  12 , for stable support of the rear wheel  12 . 
     Referring to  FIGS. 3A and 3B , the frame support portion  100  according to an embodiment is a support member for stably fixing a position of the bicycle  10  by being detachably coupled to the bicycle frame  11 , and may include a first support bar  110 , a second support bar  120 , a connection portion  130 , a rotation controller  140 , a weight measuring portion  150 , a movement limiting portion  170 , and a rotation slide guide  180 . 
     The first support bar  110  is a linear rod-shaped support member, which extends in one direction. As an example, one end portion of the first support bar  110  may include a (1-1) st  support bar  111  and a (1-2) nd  support bar  112 , which are provided so as to be detachable from each other. The (1-1) st  support bar  111  and the (1-2) nd  support bar  112  may be separated from each other to be detachably coupled to one side (downtube) of the bicycle frame  11 . At this time, a clamp  113  structure, to which one side (downtube) of the bicycle frame  11  may be detachably coupled, may be formed by the coupling of the (1-1) st  support bar  111  with the (1-2) nd  support bar  112 . In addition, a connection structure that may be connected to the other end portion of the second support bar  120 , which will be described later below, may be provided at the other end portion of the first support bar  110 . 
     As an example, the clamp  113  may be provided in a cylindrical shape, into which a portion of the bicycle frame  11  is inserted. At this time, the clamp  113  may be formed to fix a portion of the bicycle frame  11 , and thus, the bicycle  10  may be supported by the bicycle simulator  1 . 
     As another example, the clamp  113  may be provided in a horseshoe shape, into which a portion of the bicycle frame  11  is inserted, as shown in  FIG. 3C . In this case, a contact portion  1130  provided in the clamp  113  may include a first support surface  1131  and a second support surface  1132 , which are arranged to face each other with a certain interval therebetween. In addition, when the clamp  113  structure is provided in a horseshoe shape as described above, the first support bar  110  may be provided integrally. As an example, a portion of the bicycle frame  11 , for example, a downtube of the bicycle frame  11 , may be inserted between the first support surface  1131  and the second support surface  1132  via a bicycle entry portion  1133 . In this case, the downtube of the bicycle frame  11  may be arranged to contact the first support surface  1131  and the second support surface  1132 . As an example, the contact portion  1130  may be provided as an electromagnet, and the bicycle frame  11  may be fixed to the contact portion  1130  according to driving of the electromagnet. 
     The second support bar  120  is a linear rod-shaped support member that extends in one direction, and the first support bar  110  may be connected to the second support bar  120  so that it may rotate about one axis X with respect to the second support bar  120 . For example, one end portion of the second support bar  120  may be arranged to be rotatable with respect to the support frame  21  provided in the base portion  20 . As an example, a staircase-shaped rotation slide portion  123  may be provided at one end portion of the second support bar  120 , and the rotation slide portion  123  may rotate about the Z-axis while engaging with the rotation slide guide  180 , which will be described later below. At this time, in the second support bar  120 , a plurality of long holes  121 , for example, four long holes, for limiting a range of rotation about the Z-axis may be arranged to be spaced apart from each other with a preset interval therebetween. A rotation restraint portion  122  may be inserted into each of the plurality of long holes  121 , limiting a rotation of the second support bar  120  about the Z-axis. As an example, the rotation restraint portion  122  may be provided in a rod shape extending in one direction. In addition, a connection structure, which may be connected to the other end of the first support bar  110 , may be provided at the other end portion of the second support bar  120 . 
     The connection portion  130  is a connection member for connecting the other end portion of the second support bar  120  to the other end portion of the first support bar  110  so that the first support bar  110  may rotate about the one axis X with respect to the second support bar  120 . As an example, the connection portion  130  includes a hinge shaft  133 , which is inserted into a first hinge ball  131  and a second hinge ball  132 , to hingeably couple the first support bar  110  to the second support bar  120 . At this time, the hinge shaft  133  may extend in the one axis X direction, and thus, the first support bar  110  may rotate about the one axis X with respect to the second support bar  120 . In the above-described embodiment, the connection portion  130  is implemented by hinged coupling, but the present disclosure is not limited thereto. Any connection portion  130  that connects the first support bar  110  to the second support bar  120  such that the first support bar  110  may rotate about the one axis X with respect to the second support bar  120  may be used. A separate fastening portion  134  capable of restricting rotation of the first support bar  110  with respect to the second support bar  120  may be provided in the connection portion  130 . As an example, the fastening portion  134  may be provided in a screw shape and may detachably couple the first support bar  110  to the second support bar  120  to thereby restrict the rotation of the first support bar  110  with respect to the second support bar  120 . 
     The rotation controller  140  is an angle-limiting member that may limit a rotation angle of the first support bar  110  with respect to the second support bar  120 . As an example, one end portion of the rotation controller  140  may be arranged to be fixed to an end of the first support bar  110 , and the other end portion of the rotation controller  140  may be arranged to be fixed to the base portion  20 . For example, the other end portion of the rotation controller  140  may be arranged to be fixed to the support frame  21  provided in the base portion  20 . In addition, as an example, the rotation controller  140  may be provided as a stretchable elastic member, and thus, the first support bar  110  may be restrained to be inclined by a preset angle with respect to the second support bar  120  within an elastic limit range of the rotation controller  140 . In addition, the first support bar  110 , which rotates about the second support bar  120  by an external force of the rider R, may receive a restoring force for returning to the initial position, from the rotation controller  140 . 
     The weight-measuring portion  150  is a sensor member for measuring a weight of the rider Ron the bicycle  10 . As an example, the weight-measuring portion  150  may be implemented as a gravity sensor, etc., in which a weight of the rider R on the bicycle  10  may be measured. However, the present disclosure is not limited thereto, and any sensor member that may measure the weight of the rider R on the bicycle  10  may be used. As an example, the weight-measuring portion  150  may be arranged to be fixed to the support frame  21 , and at this time, the other end portion of the rotation controller  140  may be arranged to be fixed to the weight-measuring portion  150 . In addition, the rotation restraint portion  122  may be arranged to be fixed to an insertion hole  151  arranged in the weight measuring portion  150  and may move along the plurality of long holes  121 . 
     The movement-limiting portion  170  is a movement restraint member, in which the first support bar  110  may be prevented from moving in one axial direction X with respect to the second support bar  120 . As an example, a certain spaced interval may be generated between the first support bar  110  and the second support bar  120  according to manufacturing tolerances. The movement-limiting portion  170  is arranged between the first support bar  110  and the second support bar  120  to eliminate a spaced interval between the first support bar  110  and the second support bar  120 , and thus, the movement in the x-axis direction of the first support bar  110  with respect to the second support bar  120  may be prevented. 
     The rotation slide guide  180  is a guide member that may engage with the rotation slide portion  123  provided at one end portion of the second support bar  120  to guide a rotation of the second support bar  120 . As an example, the rotation slide guide  180  may be arranged to be fixed on the upper portion of the weight-measuring portion  150 , and may be provided in a guide shape that extends in a second direction, which is perpendicular to a first direction Y, for example, in a circumferential direction around the Z-axis. Accordingly, the second support bar  120  may rotate about the Z-axis with respect to the weight-measuring portion  150 , more specifically, the support frame  21  provided in the base portion  20 . 
     Referring back to  FIGS. 1 and 2 , the speed measuring portion  60  is a component that calculates a travelling speed from a size of the circumference of the rear wheel  12  and the number of rotations of the rear wheel  12  per unit time, and may be installed in a location adjacent to the rear wheel  12  in order to accurately count the number of rotations of the rear wheel  12 . 
     The air-blowing device  70  is a component for providing wind, which is variable, to the rider R according to the travelling speed calculated in the speed measuring portion  60 , and a pair of air-blowing devices  70  may be each provided at the upper left and right sides of the display device  80 , which will be described later below, while being oriented toward the rider R. The travelling speed calculated in real time from the speed measuring portion  60  as described above may be transmitted to a controller (not shown) as travelling information for a specific area or course of a bicycle competition selected by the rider R. In addition, the controller (not shown) that receives the travelling speed operably controls the air-blowing device  70  with an intensity corresponding to the speed so that a dynamic and realistic riding experience may be provided to the rider R. 
     The display device  80  is a component that visually conveys a travel environment for a course of a bicycle competition, an operating system program, or etc. to the rider R, and may be a display device  80  having a curved shape of a size that covers all of the front viewing angle of the rider R as shown in  FIG. 1 , or a goggle-type display device (not shown) worn by the rider R. As an example, when the display device  80  realistically displays a preset travel environment, etc., the rider R may adjust an inclination angle of the bicycle  10  in various ways based on road surface condition information corresponding to a travel environment provided in real time. 
     As described above, the rider R on the bicycle  10  may experience, not only visually but also with the whole body, various road surface conditions having an inclination angle as shown in  FIG. 4 , in conjunction with the display device  80 , and thus, a more dynamic and exciting ride may be enjoyed in the indoor space. 
       FIG. 4  is a schematic diagram of a display device in which a travelling scene having a slope is displayed, according to an embodiment of the present disclosure.  FIG. 5  is a front view of a bicycle simulator, according to an embodiment of the present disclosure.  FIG. 6  is a partial schematic diagram of a frame support portion, according to an embodiment of the present disclosure. 
     Referring to  FIG. 4 , a state of the rider R on a bicycle travelling on an inclined road having a first inclination angle θ 1  may be displayed on the display device  80 . As an example, such a travel route may implement a velodrome used in a cycling-only stadium or a mountain bike path. At this time, the rider R boarding the bicycle simulator  1  according to an embodiment of the present disclosure may recognize a riding situation displayed on the display device  80  and then, manipulate the bicycle  10  to respond to the riding situation. As an example, as shown in  FIG. 5A , the rider R may travel by tilting the bicycle  10  to have a second inclination angle θ 2  with respect to a plane parallel to the base portion  20 . 
     When the rider R travels on the tilted bicycle  10 , as shown in  FIG. 6 , the first support bar  110  supporting a portion of the bicycle  10  may rotate about the one axis X with respect to the second support bar  120 . In this case, a rotation angle δ of the first support bar  110  may be substantially the same as the second inclination angle θ 2 . In addition, at this time, the rotation controller  140 , which is arranged to be fixed to an end of the first support bar  110 , may limit the rotation angle δ of the first support bar  110  so that the first support bar  110  does not incline more than a threshold rotation angle δ, for example, more than 60 degrees. As an example, when the rotation controller  140  is provided as an elastic member, the rotation controller  140  may extend as the first support bar  110  rotates with respect to the second support bar  120 . At this time, by the elastic restoring force of the rotation controller  140 , an inclination angle of the first support bar  110  may be limited so that the first support bar  110  may not rotate more than the threshold rotation angle δ. Thus, the rider R may more safely enjoy a bicycle ride. In addition, when an external force is not applied to the bicycle  10  by the rider R or an external force less than a preset threshold is applied to the bicycle  10 , the extended rotation controller  140  may be shortened, and thus, a position in which the first support bar  110  rotates may be restored. In the present embodiment, the rotation controller  140  is implemented as an elastic member. However, another restraint member capable of restraining the rotation of the first support bar  110  may be arranged. In addition, the rotation controller  140  may stepwise restrain the rotation angle δ of the first support bar  110  with respect to the second support bar  120 . 
     As described above, as the first support bar  110  rotates about the one axis X with respect to the second support bar  120  within a preset range, the rider R may more safely enjoy a dynamic experience in an indoor space as if travelling on a velodrome or a mountain bike path having an inclination angle. 
       FIG. 7A  is a perspective view of a bicycle simulator, according to another embodiment.  FIG. 7B  is a partial cross-sectional view of a bicycle simulator, according to another embodiment.  FIG. 7C  is a partial perspective view of a bicycle simulator, according to another embodiment. Configurations that are substantially the same as those described with reference to  FIGS. 1 to 6  are omitted for convenience of description. 
     Referring to  FIGS. 7A to 7C , the bicycle simulator  1  according to an embodiment may further include a slide guide  210  arranged in an upper portion of the base portion  20 , a slide portion  220  fixed to one end portion of the frame support portion  100  and connected to the slide guide  210  so as to move along the slide guide  210 , a movement interval adjustment portion  230  capable of adjusting a movement interval of the slide portion  220 , and a movement interval detection portion  240  capable of detecting a movement interval of the slide guide  210 . 
     The slide guide  210  may be formed as a slide rail that extends in a first direction Y. As an example, the slide guide  210  may be arranged to be fixed to the upper portion of the base portion  20 , more specifically, to an upper portion of the support frame  21 . The slide portion  220  may be fixed to one end portion of the frame support portion  100  to guide a movement of the frame support portion  100  in the first direction Y. As an example, the slide portion  220  may be arranged to be inserted into the slide guide  210 , and thus, the slide portion  220  may move along a route of the slide guide  210 . As an example, the weight-measuring portion  150  may be arranged to be fixed to the upper portion of the slide portion  220 , as shown in  FIG. 7B . 
     The movement interval adjustment portion  230  is an adjustment member that adjusts a movement interval at which the slide portion  220  may move from the slide guide  210 , according to a travel mode. As an example, the movement interval adjustment portion  230  may include a first movement interval adjustment device  231  and a second movement interval adjustment device  232 , which are provided in a rod shape and arranged at opposite lateral sides. The first movement interval adjustment device  231  and the second movement interval adjustment device  232  according to an example may be arranged so as to be inserted into a slide rail formed in the slide guide  210 . At this time, the first movement interval adjustment device  231  and the second movement interval adjustment device  232  may move along the slide rail (not shown) according to a pre-selected travel mode and restrain a movement interval at which the slide portion  220  may move in a first direction. In addition, when the first movement interval adjustment device  231  and the second movement interval adjustment device  232  are spaced apart by a preset movement interval, positions of the first movement interval adjustment device  231  and the second movement interval adjustment device  232  may be fixed onto the slide guide  210  by using a releasable fixing device (not shown). 
     The movement interval detection portion  240  may detect and track a movement interval that is generated by the movement of the slide portion  220  along the slide guide  210 . As an example, the movement interval detection portion  240  may be a time-of-flight camera (ToF camera), which is a type of depth camera. For example, when the movement interval detection portion  240  is implemented as a ToF camera, the movement interval detection portion  240  may include a light source  241  and a sensor unit  240 , wherein the light source  241  radiates certain light, and the sensor unit  240  detects reflected light, which is light that has been irradiated from the light source  241  onto a portion of the slide portion  20  and reflected. In the above-described embodiment, the ToF camera is described as an example of the movement interval detection portion  240 , but the present disclosure is not limited thereto. The movement interval detection portion  240  according to an example may be implemented as an arbitrary detection device capable of detecting and tracking a movement interval of the slide portion  220  with respect to the base portion  20 . 
     According to an example, the movement interval detection portion  240  may be arranged to be fixed to the base portion  20  or a device fixed to the base portion  20 , for example, the movement interval adjustment portion  230 . At this time, the movement interval adjustment portion  230  may be arranged so as to be detachable from the base portion  20 . Accordingly, the movement interval detection portion  240  may detect a movement range and left-and-right movement direction of the slide portion  220 , more specifically, the frame support portion  100 , with respect to the base portion  20 . A steering direction of the movement interval detection portion  240  may be detected according to a movement direction of the slide portion  220  detected by the movement interval detection portion  240 , and a degree of steering may be detected according to a movement range of the slide portion  220  detected by the movement interval detection portion  240 . 
     As shown in  FIG. 1 , the steering and movement of the bicycle  10  may be performed by rotating and moving the front wheel  14  by manipulating the handle bar by the rider R. At this time, the rider R must rotate the handle bar of bicycle  10  or maintain a position of the handle bar by using upper body muscles, in order to change or maintain the steering and movement range of the bicycle  10 . At this time, the type of the rider R may be various, such as children, the prime-aged, and the elderly, and the capability to change and maintain the steering and movement range of the bicycle  10  may vary according to the type of the rider R. 
     As described above, because the steering capability of the rider R on the bicycle  10  may vary, it is necessary to adjust the steering and movement range of the bicycle  10  mounted on the bicycle simulator  1  according to the type of the rider R for the safety of the rider R. 
       FIGS. 8A to 8B  are schematic plan views of a bicycle simulator according to steering of a bicycle. 
     Referring to  FIG. 8A , the rider R boarding a bicycle simulator according to an embodiment of the present disclosure steers the bicycle  10  to rotate clockwise in the one axial direction X and a second direction perpendicular to the first direction Y, for example, the Z-axis, the front wheel  14  may first rotate clockwise before the rear wheel  12 . At this time, as shown in  FIG. 7B , the rotation slide portion  123  provided at one end portion of the second support bar  120  may rotate in a clockwise direction around the Z-axis along the rotation slide guide  180 . At this time, the rotation restraint portion  122  may rotate along a plurality of long holes  121  provided in the second support bar  120 , and when the second support bar  120  rotates beyond a preset range, for example, beyond 20 degrees, the rotation restraint portion  122  may be supported at one end portion of the plurality of long holes to limit the rotation of the second support bar  120 . As the rotation slide portion  123  provided at one end portion of the second support bar  120  rotates about the Z-axis clockwise according to the rotation slide guide  180 , the frame support portion  100  supporting the bicycle frame  11  may also rotate about the Z-axis clockwise as shown in  FIG. 7A . That is, the frame support portion  100  may rotate clockwise or counterclockwise about the z-axis with respect to the slide portion  220  supported at the therebelow, and at this time, the frame support portion  100  may rotate at an preset angle, for example, at an angle of 0 degrees or more and 20 degrees or less, by the rotation restraint portion  122 . As described above, the frame support portion  100  supporting the bicycle frame  11  rotates to correspond to the rotation of the front wheel  14 , and thus, the stress due to the relative positional error that may be applied to the frame support portion  100  according to the rotation of the front wheel  14  may be reduced. 
     Referring to  FIG. 8B , the rear wheel  12  may also rotate according to the rotation of the front wheel  14  and the frame support portion  100 . As the rear wheel  12  rotates, the front wheel  14  and the rear wheel  12  may be arranged in a straight line, and a position of the bicycle  10  may move along the Y-axis as compared to  FIG. 8A . 
       FIGS. 9A to 9C  are schematic plan views of a bicycle simulator according to each travel mode. 
     Referring to  FIG. 9A , in a first travel mode, the slide portion  220  may move from 10 cm or more to 20 cm or less in the first direction Y. At this time, the first movement interval adjustment device  231  and the second movement interval adjustment device  232  may be arranged so as to be spaced apart from each other by the above-described first interval M 1 , for example, 10 cm or more and 20 cm or less, on the slide guide  210 . Therefore, the slide portion  220  may be restrained in its movement range by the first movement interval adjustment device  231  and the second movement interval adjustment device  232 , and the bicycle  10  supported by the slide portion  220  may be steered and move only within a first movement range T 1  corresponding to the first interval M 1  of the first movement interval adjustment device  231  and the second movement interval adjustment device  232 . 
     Referring to  FIG. 9B , in a second travel mode, the slide portion  220  may move more than 20 cm and 40 cm or less along the first direction Y. At this time, the first movement interval adjustment device  231  and the second movement interval adjustment device  232  may be arranged so as to be spaced apart from each other by the above-described second interval M 2 , for example, more than 20 cm and 40 cm or less, on the slide guide  210 . Therefore, the slide portion  220  may be restrained in its movement range by the first movement interval adjustment device  231  and the second movement interval adjustment device  232 , and the bicycle  10  supported by the slide portion  220  may be steered and move only within a second movement range T 2  corresponding to the second interval M 2  of the first movement interval adjustment device  231  and the second movement interval adjustment device  232 . 
     Referring to  FIG. 9C , in a third travel mode, the slide portion  220  may move more than 40 cm in the first direction Y. At this time, the first movement interval adjustment device  231  and the second movement interval adjustment device  232  may be arranged so as to be spaced apart from each other by the above-described third interval M 3 , for example, more than 40 cm, on the slide guide  210 . Therefore, the slide portion  220  may be restrained in its movement range by the first movement interval adjustment device  231  and the second movement interval adjustment device  232 , and the bicycle  10  supported by the slide portion  220  may be steered and move only within a third movement range T 3  corresponding to the third interval M 3  of the first movement interval adjustment device  231  and the second movement interval adjustment device  232 . 
     As shown in  FIGS. 9A to 9C , the first to third intervals M 1 -M 3  of the first movement interval adjustment device  231  and the second movement interval adjustment device  232  may increase. Accordingly, the first to third movement ranges T 1 -T 3  in which the front wheel  14  and the rear wheel  12  of the bicycle  10  may move in the first direction Y on the upper surfaces of the front wheel support portion  40  and the rear wheel support portion  50  may also increase. 
     As described above, the steering and movement of the bicycle  10  may be performed by a manipulation of the rider R to rotate and move the front wheel  14 . At this time, when adjusting a movement range T of the bicycle  10  to adjust a separation interval M of the first movement interval adjustment device  231  and the second movement interval adjustment device  232 , the steering and movement range of the bicycle  10  may be restrained within the movement range T described above. At this time, the rider R may select any one of the first to third travel modes by using an input unit  97 , and a controller  90  may adjust the movement interval M of the slide portion  220  that may move in the slide guide  210  according to a travel mode input to the input unit  97 , to adjust the movement range T of the bicycle  10 . 
     As an example, when the rider R is a beginner unfamiliar with the bicycle  10  or an elderly person with weak muscle strength, the first travel mode may be selected, and accordingly, the bicycle  10  is steered and moves only within the first movement range T 1 . Thus, a bike ride that is safer may be enjoyed. On the other hand, when the rider R is a person of intermediate level or a youth group familiar with the bicycle  10 , the second travel mode may be selected, and accordingly, the bicycle  10  is steered and moves only within a second movement range T 2 . Thus, a bike ride that is more natural may be enjoyed. In addition, when the rider R is an advanced or professional player who is familiar with bicycle  10 , the third travel mode may be selected, and accordingly, the bicycle  10  is steered and move within a third movement range T 3 . Thus, a bike ride that is more thrilling may be enjoyed. 
       FIG. 10A  is a side view of a bicycle simulator, according to another embodiment of the present disclosure.  FIG. 10B  is a plan view of a bicycle simulator, according to another embodiment of the present disclosure.  FIG. 10C  is a partial perspective view of the bicycle simulator shown in  FIG. 10A . 
     Referring to  FIGS. 10A and 10C , a belt  96  for connecting the front wheel support portion  40  to the first rear roller  51  may be arranged between the front wheel support portion  40  and the first rear roller  51 , according to another embodiment of the present disclosure. In this case, the belt  96  is arranged to be wound along the outer circumferential surfaces of the front wheel support portion  40  and the first rear roller  51  so as to transmit rotational force to the front wheel support portion  40  and the first rear roller  51 . 
     As an example, when the rider R rotates the rear wheel  12  of the mounted bicycle  10 , the first rear roller  51  may also rotate by the rotational force of the rear wheel  12 . At this time, the rotational force of the first rear roller  51  may be transmitted to the front wheel support portion  40  through the belt  96 . Thus, the rotational speed of the front wheel support portion  40  is formed equal to that of the first rear roller  51 , thereby providing a stable ride experience to the rider R. As an example, the belt  96  may be arranged on an outer side portion of the base portion  20  for convenience of replacement and maintenance. At this time, the front wheel support portion  40 , the first rear roller  51 , and the second rear roller  52  may each rotate about the base portion  20  without a separate rotation axis, by respectively using bearing portions  26 ,  27 , and  28  each arranged along the outer circumferential surfaces of the front wheel support portion  40 , the first rear roller  51 , and the second rear roller  52 . 
     In the above, although specific embodiments of the present disclosure have been described and illustrated, it will be obvious to those of skill in the art that the present disclosure is not limited to the described embodiments, and that various modifications and variations may be made without departing from the spirit and scope of the present disclosure. Accordingly, such modifications or variations should not be individually understood from the technical spirit or viewpoint of the present disclosure, and the modified embodiments should be said to belong to the claims of the present disclosure.