Patent Publication Number: US-2018043965-A1

Title: Electrically operated bicycle

Description:
TECHNICAL FIELD 
     One or more embodiments of the present disclosure relate to electrically operated bicycles. 
     BACKGROUND ART 
     Bicycles may be generally categorized into fixed frame bicycles and folding bicycles. Fixed frame bicycles have a simple and rigid structure, and when an electric bicycle is embodied as a fixed frame bicycle, a battery pack may be more easily installed inside a frame. 
     In general fixed frame bicycles, however, it is not easy to secure a space for fixing a battery pack according to the design of frames, and in some cases, a high-capacity battery pack cannot be employed. 
     In addition, when an electric bicycle is embodied as a folding bicycle, it is very inconvenient to install a battery pack in a frame, and an overall frame structure becomes complicated for the installation of a battery pack. 
     DETAILED DESCRIPTION OF THE INVENTION 
     Technical Problem 
     One or more embodiments of the present disclosure provide electrically operated bicycles having a high degree of freedom of installation of a battery pack. In addition, one or more embodiments of the present disclosure provide folding electrically operated bicycles having a much smaller size when folded, thus capable of being easily stored and transported and being highly portable. 
     Technical Solution 
     According to an aspect of an embodiment, an electrically operated bicycle includes a first frame, a second frame coupled to the first frame and including a seat, a first axle frame supporting a front axle connected to a front wheel and rotatably connected to one end of the first frame, a second axle frame supporting a rear axle connected to a rear wheel, a driving member configured to apply a driving force to at least one of the front wheel and the rear wheel, a battery pack electrically connected to the driving member, a first engagement member coupled to the battery pack and configured to fix the battery pack to the first frame, and a second engagement member coupled to the battery pack and configured to fix the battery pack to the second frame. 
     In an embodiment, the first frame may include a 1-1 frame and a 1-2 frame separated from each other, and the electrically operated bicycle may further include a first hinge part between the 1-1 frame and the 1-2 frame and configured to bend the first frame in a direction in which the front wheel and the rear wheel overlap with each other. 
     In an embodiment, the electrically operated bicycle may further include a third frame with the first and second engagement members positioned thereat, a first fixing member between the third frame and the first frame, and a second fixing member between the third frame and the second frame. 
     In an embodiment, the third frame may include a 3-1 frame and a 3-2 frame separated from each other, and the electrically operated bicycle may further include a second hinge part between the 3-1 frame and the 3-2 frame and configured to bend the third frame in a direction in which the front wheel and the rear wheel overlap with each other. 
     In an embodiment, the third frame may include at least one bent portion. 
     In an embodiment, the electrically operated bicycle may further include a fourth frame between the third frame and at least one of the first fixing member and the second fixing member. 
     In an embodiment, the fourth frame may be configured to be inserted into the third frame. 
     In an embodiment, the electrically operated bicycle may further include a third hinge part between the third frame and the fourth frame in such a way that the fourth frame rotates about the third frame. 
     In an embodiment, the fourth frame may include a 4-1 frame and a 4-2 frame separated from each other, the electrically operated bicycle may further include a fourth hinge part between the 4-1 frame and the 4-2 frame in such a way that the 4-1 frame rotates about the 4-2 frame, and the 4-2 frame may be configured to be inserted into the third frame. 
     In an embodiment, the fourth frame may include a 4-1 frame and a 4-2 frame separated from each other, and the electrically operated bicycle may further include a fifth hinge part between the 4-1 frame and the 4-2 frame and configured to bend the fourth frame in a direction in which the front wheel and the rear wheel overlap with each other. 
     In an embodiment, the electrically operated bicycle may further include a fifth frame fixedly coupled to a frame structure of the electrically operated bicycle and a sixth hinge part between the fifth frame and at least one of the first fixing member and the second fixing member and configured to rotate the third frame in a direction in which the front wheel and the rear wheel overlap with each other. 
     Additional aspects, features, and advantages of the present disclosure in addition to those described above will be clearly understood from the accompanying drawings, the claims, and the detailed description, which will be described below. 
     Advantageous Effects of the Invention 
     According to one or more embodiments of the present disclosure, electrically operated bicycles have a more simple structure for the installation of battery packs and thus the battery packs may be easily installed and detached, and high-capacity battery packs may be used and degrees of freedom of use and installation of battery packs may be increased by easily adjusting installation angles of such battery packs. 
     In addition, the electrically operated bicycles may be simply used as folding bicycles and have a much smaller size when folded, and thus may be easily stored and transported and be highly portable. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic side view of an electrically operated bicycle according to an embodiment. 
         FIG. 2  is a side view of the electrically operated bicycle of  FIG. 1  from which a third frame is detached. 
         FIG. 3  is a schematic side view of an electrically operated bicycle according to another embodiment. 
         FIG. 4  is a schematic side view of an electrically operated bicycle according to another embodiment. 
         FIGS. 5A and 5B  are schematic side views illustrating a method of folding the electrically operated bicycle of  FIG. 4 , according to an embodiment. 
         FIG. 6  is a schematic side view illustrating a method of folding the electrically operated bicycle of  FIG. 4 , according to another embodiment. 
         FIGS. 7A and 7B  are schematic side views of an electrically operated bicycle according to another embodiment. 
         FIG. 8  is a side view of an assembly of third and fourth frames according to another embodiment. 
         FIG. 9  is a side view of an assembly of third and fourth frames according to another embodiment. 
         FIG. 10  is a side view of an assembly of third and fourth frames according to another embodiment. 
         FIG. 11  is a side view of n assembly of third and fourth frames according to another embodiment. 
         FIG. 12  is a side view of an assembly of h d and fourth frames according to another embodiment. 
         FIG. 13  is a side view of n assembly of third and fourth frames according to another embodiment. 
         FIG. 14  is a side view of an assembly of third and fifth frames according to another embodiment. 
         FIG. 15  is a side view of an assembly of third to fifth frames according to another embodiment. 
         FIG. 16  is a side view of an assembly of third to fifth frames according to another embodiment. 
         FIG. 17  is a view of first and second fixing members, according to an embodiment. 
         FIGS. 18 and 19  are views each illustrating a battery pack installed at a third frame, according to embodiments. 
         FIG. 20  is a view illustrating an installation state of a battery pack, according to another embodiment. 
     
    
    
     MODE OF THE INVENTION 
     As the present disclosure allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. Effects and features of the present disclosure and methods for achieving them will be clearly understood with reference to the drawings and embodiments described below in detail. The present disclosure may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and like reference numerals in the drawings denote like elements, and thus their description will not be repeated. 
     In the embodiments below, terms first, second, and the like do not have restrictive meanings and are only used to distinguish one element from another. 
     In the embodiments below, an expression used in the singular encompasses the expression of the plural, unless it has a clearly different meaning in the context. 
     In addition, it is to be understood that the terms such as “including” or “having,” and the like, are intended to indicate the existence of the features or elements disclosed in the specification, and are not intended to preclude the possibility that one or more other features or elements may be added. 
     In the drawings, the sizes of elements may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each element in the drawings are arbitrarily illustrated for convenience of explanation and thus the present disclosure is not particularly limited to the illustrations. 
     When an embodiment may be implemented in a different way, a certain process may be changed. For example, two consecutively described processes may be performed substantially at the same time, or may be performed in an order opposite to the described order. 
     In the embodiments below, it will be understood that when a film, a region, an element, or the like is referred to as being “connected” to another film, region or element, it may be directly connected to the other element or intervening elements may be present. 
     In the present specification, like reference numerals denote like elements. 
       FIG. 1  is a schematic side view of an electrically operated bicycle according to an embodiment. 
     Referring to  FIG. 1 , the electrically operated bicycle includes a first frame  11 , a second frame  12 , a first axle frame  21 , a second axle frame  22 , a driving member  60 , a battery pack  50 , and an engagement member  51 . 
     The first frame  11  may be arranged substantially horizontally and may be provided with a cylindrical frame  113  at one end thereof facing forward. The first axle frame  21  may be rotatably and penetratively coupled to the cylindrical frame  113 . 
     The first axle frame  21  may rotatably support a front axle  31  connected to a front wheel  311 . The first axle frame  21  may be provided with a steering handlebar  23  coupled to an upper end thereof. 
     The second frame  12  may be coupled to the first frame  11  and, in  FIG. 1 , may be coupled to the other end of the first frame  11 , but the present disclosure is not limited to the above example. For example, the second frame  12  may be coupled to a portion of the first frame  11 . 
     A seat  121  may be coupled to the second frame  12 . The second frame  12  may include a pedal part  40  and, although the pedal part  40  is schematically illustrated in the drawings, the pedal part  40  may include a pedal frame positioned at a lower end of the second frame  12  and a pedal structure including a gear part, a chain, a bearing, and the like. 
     The second axle frame  22  may rotatably support a rear axle  32  connected to a rear wheel  321 . The second axle frame  22  may be connected to the first frame  11  or indirectly connected to the first frame  11 , for example, via another member. 
     A first auxiliary frame  41  may be connected between the rear axle  32  and the pedal part  40 , and a second auxiliary frame  42  may be connected between the first frame  11  and the pedal part  40 . 
     A separate support frame  43  may be positioned between the second frame  12  and the second auxiliary frame  42 , and the support frame  43  may be connected to a central portion of a buffer frame  44 . The buffer frame  44  may have a first end connected to a buffer device  45  coupled to the support frame  43  and a second end connected to the second axle frame  22 . Accordingly, the buffer device  45  may absorb impacts transmitted to the rear wheel  321 . The buffer device  45  may be a shock absorber. 
     In addition, the electrically operated bicycle may further include the driving member  60  to apply a driving force to at least one of the front wheel  311  and the rear wheel  321 . The driving member  60  may be an electric motor which generates a driving force by electricity and a part thereof. In the accompanying drawings, the driving member  60  may be illustrated as a mid-motor adjacently installed at the pedal part  40 , but the present disclosure is not limited to the above example. For example, the driving member  60  may be a hub motor coupled to the front axle  31  and/or the rear axle  32 . In addition, the driving member  60  may have a structure in combination of the two forms. 
     The electrically operated bicycle may further include a third frame  13 . As illustrated in  FIG. 1 , the third frame  13  may be coupled to the first and second frames  11  and  12  therebetween. For the coupling of the third frame  13 , the electrically operated bicycle may further include a first fixing member  71  between the third frame  13  and the first frame  11  and a second fixing member  72  between the third frame  13  and the second frame  12 . Although not illustrated in detail in the drawings, the first and second fixing members  71  and  72  may include coupling holes at opposite ends of the third frame  13  and the first and second frames  11  and  12 , and each fixing member may include a coupling member such as a bolt fastened with the coupling hole. In addition to the bolt, the coupling member may be a device coupled or detached by user&#39;s simple operation, such as a Quick Release (OR). The coupling member may also be applied to all the embodiments of the present disclosure. 
     The first fixing member  71  may be positioned adjacent to a front end of the first frame  11 , for example, the cylindrical frame  113 , and the second fixing member  72  may be positioned adjacent to a lower end of the second frame  12 , for example, the pedal part  40 . The first fixing member  71  and the second fixing member  72  may detachably couple the third frame  13  to the first frame  11  and the second frame  12 , respectively. 
     The electrically operated bicycle may include the battery pack  50  electrically connected to the driving member  60  and the engagement member  51  coupled to the battery pack  50 . The engagement member  51  is configured to fix the battery pack  50  to at least one of the first frame  11  and the second frame  12 , and the battery pack  50  may be selectively fixed according to user&#39;s manipulation. 
     In an embodiment, as illustrated in  FIG. 1 , the engagement member  51  includes a first engagement member  511  and a second engagement member  512 , and each of the first engagement member  511  and the second engagement member  512  may be coupled to the third frame  13 . Accordingly, the battery pack  50  may be fixed to the first and second frames  11  and  12  via the third frame  13 . 
     The first engagement member  511  and the second engagement member  512  may be positioned at the third frame  13  to selectively fix the battery pack  50 , and the battery pack  50  may be detached from the first engagement member  511  and the second engagement member  512  according to user&#39;s manipulation. 
     In an embodiment, the battery pack  50  may be disposed so as to be detached by a user and thus may be easily detached and coupled by a user. 
     In an embodiment, the third frame  13  with the battery pack  50  coupled thereto may be detachably coupled to the first and second fixing members  71  and  72 . Thus, the third frame  13  may be detached by a user from the first and second fixing members  71  and  72  and thus, as illustrated in  FIG. 2 , the electrically operated bicycle may be used the same as a general bicycle. 
     The embodiment illustrated in  FIG. 2  and modifications thereof may be equally applied to all the embodiments of the present disclosure. 
       FIG. 3  is a schematic side view of an electrically operated bicycle according to another embodiment. 
     Referring to  FIG. 3 , in the electrically operated bicycle, the third frame  13  includes at least one bent portion. According to the embodiment illustrated in  FIG. 3 , the third frame  13  includes the first and second bent portions  13   a  and  13   b  that are bent upward and downward in directions different from each other, and the first bent portion  13   a  positioned on an upper side is in a form bent backward and, accordingly, a buffer space of the front wheel  311  may be more widely secured. The battery pack  50  may have a steep fixed angle. 
     The embodiment illustrated in  FIG. 3  and modifications thereof may be equally applied to all the embodiments of the present specification. 
       FIG. 4  is a schematic side view of an electrically operated bicycle according to another embodiment. 
     In the electrically operated bicycle according to the present embodiment, the first frame  11  includes a 1-1 frame  111  and a 1-2 frame  112  separated from each other, and the 1-1 frame  111  and the 1-2 frame  112  are coupled to each other by a first hinge part  81 . 
     The first hinge part  81  is disposed between the 1-1 frame  111  and the 1-2 frame  112  and is configured to bend the first frame  11  about a folding axis F. By bending the first frame  11  by the first hinge part  81 , as illustrated in  FIG. 5B , the electrically operated bicycle may be folded such that the front wheel  31  and the rear wheel  32  overlap with each other. 
     Thus, the electrically operated bicycle may be used by a user as a folding bicycle. 
     In an embodiment, to fold the electrically operated bicycle, as illustrated in  FIG. 5A , the third frame  13  may be detached from the second fixing member  72 . In this regard, the third frame  13  may be coupled by the first fixing member  71  to the first frame  11 , in particular, the 1-1 frame  111 . The third frame  13  may be rotatably coupled to the first fixing member  71  and, accordingly, the third frame  13  rotates downward A and is hung from the first fixing member  71 . 
     In this state, as illustrated in  FIG. 5B , the electrically operated bicycle may be folded in half by bending the first frame  11  about the folding axis F of the first hinge part  81  in a folding direction B. 
     As such, the electrically operated bicycle may be folded in half by a simple manipulation, i.e., by separating the third frame  13  from the second fixing member  72  without interference with the battery pack  50 . 
     In addition, the electrically operated bicycle according to the embodiment illustrated in  FIG. 4  may be folded in half, as illustrated in  FIG. 6 , by separating the third frame  13  from the first and second fixing members  71  and  72  to completely separate the battery pack  50  from the bicycle and then by bending the first frame  11  about the folding axis F of the first hinge part  81  in the folding direction B. 
     These embodiments and modifications thereof may be applied to all the embodiments of the present specification. 
       FIGS. 7A and 7B  are schematic side views of an electrically operated bicycle according to another embodiment. 
     Referring to  FIG. 7A , the third frame  13  includes a 3-1 frame  131  and a 3-2 frame  132  separated from each other, and the 3-1 frame  131  and the 3-2 frame  132  may be coupled to each other by a second hinge part  82 . The second hinge part  82  is disposed between the 3-1 frame  131  and the 3-2 frame  132  to bend the third frame  13  about a second folding axis F 2  in the folding direction B. In this regard, the first hinge part  81  may also bend the first frame  11  about the first folding axis F 1  and thus the first frame  11  and the third frame  13  may be bent by the first hinge part  81  and the second hinge part  82  and thus, as illustrated in  FIG. 7B , the front wheel  31  and the rear wheel  32  may be bent to overlap with each other. The second folding axis F 2  of the second hinge part  82  may be in a direction parallel to the first folding axis F 1  of the first hinge part  81 . Accordingly, the electrically operated bicycle may be easily folded about the first hinge part  81  and the second hinge part  82 . 
     In the above embodiment, the battery pack  50  and the engagement member  51  may be installed at the 3-1 frame  131  and, accordingly, the electrically operated bicycle may be easily folded in half by a user without separation of and interference with the battery pack  50 . 
     These embodiments and modifications thereof may be applied to all the embodiments of the present specification. 
       FIG. 8  is a view of the third frame  13  according to another embodiment. In the embodiment illustrated in  FIG. 8 , a fourth frame  14  may be further disposed between the third frame  13  and the first fixing member  71 . 
     In an embodiment, a third hinge part  83  may be further disposed between the fourth frame  14  and the third frame  13 . The fourth frame  14  may be rotated by the third hinge part  83  along a rotation direction C about the third frame  13 . The rotation direction C may be on a plane parallel to a direction facing front and rear directions of the bicycle. 
     According to the present embodiment, the third frame  13  is coupled to the fourth frame  14  and a coupling angle therebetween may vary and, consequently, the third frame  13  may be positioned downward. Accordingly, a fixed angle of the battery pack  50  may be easily adjusted, and the battery pack  50  may be more easily detached by a user. In addition, the third frame  13  is coupled to the fourth frame  14  to have a bent structure and thus the third frame  13  at which the battery pack  50  is installed may have a sufficiently long length and, accordingly, a higher capacity battery pack may be mounted. 
     In  FIG. 8 , the fourth frame  14  is disposed between the first fixing member  71  and the third frame  13 , but the present disclosure is not limited to the above example. For example, the fourth frame  14  may be positioned between the second fixing member  72  and the third frame  13 . 
     The embodiment illustrated in  FIG. 8  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     In an embodiment illustrated in  FIG. 9 , the fourth frame  14  may be provided with a position adjustment groove  143  formed along a length direction thereof to change an installation position of the first fixing member  71 . Accordingly, the installation position of the first fixing member  71  is changed along a length direction D of the fourth frame  14 , and an effect of changing the length of the fourth frame  14  may be obtained. Thus, an assembly of the third and fourth frames  13  and  14  according to the present embodiment may be applied by a user to bicycles with various sizes and a degree of freedom of installation may be increased. 
     As described above, in  FIG. 9 , the fourth frame  14  is positioned between the first fixing member  71  and the third frame  13 , but the present disclosure is not limited to the above example. For example, the fourth frame  14  may be positioned between the second fixing member  72  and the third frame  13  and, in this case, the position adjustment groove  143  may also be equally applied. 
     The embodiment illustrated in  FIG. 9  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     According to an embodiment illustrated in  FIG. 10 , the fourth frame  14  may be inserted into the third frame  13 . Accordingly, a length E of the fourth frame  14  may be changed. Thus, an assembly of the third and fourth frames  13  and  14  according to the present embodiment may be applied by a user to bicycles with various sizes and a degree of freedom of installation may be increased. 
     As described above, in  FIG. 10 , the fourth frame  14  is positioned between the first fixing member  71  and the third frame  13 , but the present disclosure is not limited to the above example. For example, the fourth frame  14  may be positioned between the second fixing member  72  and the third frame  13  and, in this case, the fourth frame  14  may be inserted into the third frame  13 . 
     The embodiment of  FIG. 10  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     In an embodiment illustrated in  FIG. 11 , one fourth frame  14   a  may be coupled to the first fixing member  71  and the third frame  13  therebetween via the third hinge part  83 , and another fourth frame  14   b  may be disposed between the second fixing member  72  and the third frame  13 . The other fourth frame  14   b  may be inserted into the third frame  13 . Accordingly, a user may obtain both an effect of changing the length of the third frame  13  and an effect of changing an installation angle of the battery pack  50 . Although  FIG. 11  illustrates that the fourth frame  14   a  is coupled to the first fixing member  71  and the third frame  13  therebetween via the third hinge part  83  and the other fourth frame  14   b  is disposed between the second fixing member  72  and the third frame  13 , the present disclosure is not limited to the above example. For example, the fourth frame  14   a  may be coupled to the first fixing member  71  and the third frame  13  therebetween to be inserted into the third frame  13 , and the other fourth frame  14   b  may be coupled to the second fixing member  72  and the third frame  13  therebetween via the third hinge part  83 . 
     The embodiment of  FIG. 11  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     In an embodiment illustrated in  FIG. 12 , the fourth frame  14  may include a 4-1 frame  141  and a 4-2 frame  142  separated from each other. In addition, a fourth hinge part  84  may be disposed between the 4-1 frame  141  and the 4-2 frame  142  so that the 4-1 frame  141  rotates about the 4-2 frame  142 . In addition, the 4-2 frame  142  may be inserted into the third frame  13 . Thus, an assembly of the third and fourth frames  14  according to the present embodiment may be applied by a user to bicycles with various sizes and a degree of freedom of installation may be increased. 
     In  FIG. 12 , the fourth frame  14  is disposed between the first fixing member  71  and the third frame  13 , but the present disclosure is not limited to the above example. For example, the fourth frame  14  may also be disposed between the second fixing member  72  and the third frame  13 . 
     The embodiment of  FIG. 12  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     According to an embodiment illustrated in  FIG. 13 , the fourth frame  14  may be disposed between the second fixing member  72  and the third frame  13 , and the fourth frame  14  may be coupled to the third frame  13  by the third hinge part  83 . Thus, an angle between the third and fourth frames  13  and  14  may be changed about the third hinge part  83 . 
     In addition, the fourth frame  14  includes the 4-1 frame  141  and the 4-2 frame  142  separated from each other, and the 4-1 frame  141  and the 4-2 frame  142  may be coupled to each other by a fifth hinge part  85 . 
     The fifth hinge part  85  is disposed between the 4-1 frame  141  and the 4-2 frame  142  to bend the fourth frame  14  in the folding direction B about a third folding axis F 3 . In this regard, since the first hinge part  81  may bend the first frame  11  about the first folding axis F 1 , the first frame  11  and the fourth frame  14  are bent by the first hinge part  83  and the fifth hinge part  85 , respectively and accordingly, the front wheel  31  and the rear wheel  32  may be folded to overlap with each other. The third folding axis F 3  of the fifth hinge part  85  may be in a direction parallel to the first folding axis F 1  of the first hinge part  81 . Accordingly, the electrically operated bicycle may be easily folded about the first hinge part  81  and the fifth hinge part  85 . 
     The fourth frame  14  may also be disposed between the first fixing member  71  and the third frame  13  and the aforementioned embodiment may be equally applied thereto. 
     The embodiment of  FIG. 13  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     According to an embodiment illustrated in  FIG. 14 , a sixth hinge part  86  may be coupled to a fifth frame  15  fixedly coupled to a bicycle frame structure, and the second fixing member  72  may be coupled to the sixth hinge part  86 . 
     The sixth hinge part  86  is configured to rotate the third frame  13  about a fourth folding axis F 4  in the folding direction B. In this regard, since the first hinge part  81  may bend the first frame  11  about the first folding axis F 1 , the first frame  11  is bent by the first hinge part  81  and the fourth frame  13  is rotated by the sixth hinge part  86  and accordingly, the front wheel  31  and the rear wheel  32  may be folded to overlap with each other. The fourth folding axis F 4  of the sixth hinge part  86  may be in a direction parallel to the first folding axis F 1  of the first hinge part  81 . Accordingly, the electrically operated bicycle may be easily folded about the first hinge part  81  and the sixth hinge part  86 . 
     The fifth frame  15  and the sixth hinge part  86  may also be coupled to the first fixing member  71  and the aforementioned embodiment may be equally applied thereto. 
     The embodiment of  FIG. 14  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     According to an embodiment illustrated in  FIG. 15 , the sixth hinge part  86  may be coupled to the fifth frame  15  fixedly coupled to a bicycle frame structure, the second fixing member  72  may be coupled to the sixth hinge part  86 , and the fourth frame  14  may be further disposed between the second fixing member  72  and the third frame  13 . In addition, the third hinge part  83  may be disposed between the fourth frame  14  and the third frame  13 . 
     As in the embodiment described above, the sixth hinge part  86  is configured to rotate the third frame  13  about the fourth folding axis F 4  in the folding direction B. In this regard, since the first hinge part  81  may bend the first frame  11  about the first folding axis F 1 , the first frame  11  is bent by the first hinge part  81  and the fourth frame  13  is rotated by the sixth hinge part  86  and accordingly, the front wheel  31  and the rear wheel  32  may be folded to overlap with each other. The fourth folding axis F 4  of the sixth hinge part  86  may be in a direction parallel to the first folding axis F 1  of the first hinge part  81 . Accordingly, the electrically operated bicycle may be easily folded about the first hinge part  81  and the sixth hinge part  86 . In this embodiment, the installation angle of the battery pack  50  may be easily changed, and the bicycle may be easily folded. 
     Also, the fifth frame  15  and the sixth hinge part  86  may be coupled to the first fixing member  71  and the fourth frame  14  may be coupled to the second fixing member  72  and the third frame  13  therebetween via the third hinge part  83 , and the aforementioned embodiment may be equally applied thereto. 
     The embodiment of  FIG. 15  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     According to an embodiment illustrated in  FIG. 16 , the fourth frame  14  may be coupled to the first fixing member  71  and the third frame  13  therebetween via the third hinge part  83 , and the second fixing member  72  may be coupled to the sixth hinge part  86  with the fifth frame  15  coupled thereto. Although not shown in the drawing, the fourth frame  14  may be coupled to the second fixing member  72  and the third frame  13  therebetween via the third hinge part  83 , and the first fixing member  71  may be coupled to the sixth hinge part  86  coupled to the fifth frame  15 . Also in this embodiment, the installation angle of the battery pack  50  may be easily changed and the bicycle may be easily folded. 
     The embodiment of  FIG. 16  and modifications thereof may be equally applied to all the embodiments of the present specification. 
       FIG. 17  is a view more particularly illustrating the first and second fixing members  71  and  72 , according to an embodiment. 
     The first fixing member  71  may include a fixing member  711  on a side of the third frame  13  and a 1-2 fixing member  712  on a side of a main frame of the bicycle. Thus, the first fixing member  71  couples the third frame  13  to the main frame of the bicycle, e.g., the first frame  11  by engagement of the 1-1 fixing member  711  with the 1-2 fixing member  712 . 
     Similarly, the second fixing member  72  may include a 2-1 fixing member  721  on a side of the third frame  13  and a 2-2 fixing member  722  on a side of a main frame of the bicycle. Thus, the second fixing member  72  couples the third frame  13  to the main frame of the bicycle, e.g., the second frame  12  by engagement of the 2-1 fixing member  721  with the 2-2 fixing member  722 . 
     In this regard, according to an embodiment of the present disclosure, a 1-3 fixing member  713  may be further disposed between the 1-1 fixing member  711  and the 1-2 fixing member  712 . The 1-3 fixing member  713  may be a buffer member which absorb various tolerances. That is, problems, e.g., bending of the third frame  13  according to tolerances of hinge parts functioning when the bicycle is folded may be solved using the 1-3 fixing member  713 . 
     According to an embodiment, a 2-3 fixing member  723  may be further disposed between the 2-1 fixing member  721  and the 2-2 fixing member  722 . The 2-3 fixing member  723  may also be used as a buffer member. The 2-3 fixing member  723  functions the same as the 1-3 fixing member  713  described above. 
     The embodiment of  FIG. 17  and modifications thereof may be equally applied to all the embodiments of the present disclosure. 
       FIG. 18  illustrates a state in which the battery pack  50  is installed at the third frame  13 . In the embodiment illustrated in  FIG. 18 , the third frame  13  may include a first engagement groove  133 . The first engagement groove  133  is an opening formed upward U and accordingly, a user may install and detach the battery pack  50  at and from the third frame  13  downward and upward, respectively. 
       FIG. 19  illustrates a state in which the battery pack  50  is installed at the third frame  13 . In the embodiment illustrated in  FIG. 19 , the third frame  13  may include a second engagement groove  134 . The second engagement groove  134  is an opening formed in a side direction S and accordingly, a user may install and detach the battery pack  50  at and from the third frame  13  in a lateral direction. 
     The embodiment(s) illustrated in  FIG. 18  and/or  FIG. 19  and modifications thereof may be equally applied to all the embodiments of the present specification. 
     In the embodiments described above, the battery pack  50  is fixed to the third frame  13  by the engagement member  51 , and the battery pack  50  is fixed to the frame of the bicycle by the third frame  13 , but the present disclosure is not limited to the above example. As in an embodiment illustrated in  FIG. 20 , the first and second engagement members  511  and  512  coupled to opposite ends of the battery pack  50  may be detachably coupled to the first frame  11  and the second frame  12 , respectively. Thus, an electrically operated bicycle having a more simple structure may be provided. 
     While one or more embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims. 
     INDUSTRIAL APPLICABILITY 
     One or more embodiments of the present disclosure relate to electrically operated bicycles.