Patent Publication Number: US-11029138-B2

Title: Drop-out mounting structure for wheel alignment

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Korean Patent Application No. 10-2018-0065773, filed on Jun. 8, 2018, the entire contents of which are incorporated herein by reference. 
     FIELD 
     An aspect of the present disclosure relates to a frame structure of a bicycle. More particularly, the present disclosure relates to a frame mounting structure of a drop-out assembly as a wheel mounting unit for mounting a wheel to a bicycle frame. 
     BACKGROUND 
     The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. 
     A typical bicycle frame includes a head tube, a seat tube, a top tube, a down tube, a seat stay, and a chain stay. 
     A steering wheel connection body is connected to an upper end portion of the head tube, and a front wheel rotary connection body is connected to a lower end portion of the head tube. A saddle connection body is connected to an upper end portion of a seat tube, and a chain drive body is connected to a lower end portion of the seat tube. 
     The top tube and the down tube connect and support the head tube and the seat tube, and the seat stay and the chain stay connect and support a rear wheel rotary connection body and the seat tube. 
     The bicycle frame may include both the top tube and the down tube, but, alternatively, one main tube (not shown) may be connected between the head tube and the seat tube. 
     The typical bicycle frame is manufactured by respectively cutting a top tube, a down tube, and a seat tube using a tube as a base material and then respectively welding them, but since it is difficult to automatically perform such manufacturing processes, productivity may deteriorate and manufacturing cost may increase. 
     Therefore, research for improving production efficiency and durability of the bicycle frame through a process of manufacturing a bicycle frame by stamp-molding a plate member and then bonding left and right portions of the hot-stamped plate member has recently progressed. 
     On the other hand, in a technique for manufacturing a stamping bicycle frame of a tube shape by stamp-molding the left and right panels and welding them, it is difficult to precisely realize the alignment of the rear wheel by welding deformation of the frame. Accordingly, research on a structure that is capable of precisely controlling the alignment of the wheel on the stamping frame has progressed in the art. 
     Particularly, if the alignment of the wheel is changed by a twist of the left and right stays, a power loss increases, uneven wear of the tire occurs, and a one-sided direction load is concentrated, thereby the frame may be damaged due to fatigue. 
     The above information disclosed in this Background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. 
     SUMMARY 
     Aspects of the present disclosure provide a drop-out mounting structure for easily and correctly performing wheel alignment without correction of the frame and adjustment of the drop-out even if the deformation of the frame is generated by welding heat. 
     A disclosed drop-out mounting structure for wheel alignment according to an aspect of the present disclosure for mounting a drop-out member as a wheel mounting unit to a bicycle frame through a bolt in a state that the drop-out member may be set according to a predetermined reference position includes a wheel alignment unit provided to be in spherical contact with a bolt fastening portion of the drop-out member and the frame as a male and female type, and performing wheel alignment according to deformation of the frame. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the drop-out members may be mounted to a stay frame of the bicycle frame in which both side panels that are stamp-molded are bonded by welding. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the wheel alignment aligning unit may include: a concave spherical portion formed at one bolt fastening hole edge of the drop-out member and the frame; and a convex spherical portion formed at another bolt fastening hole edge of the drop-out member and the frame and in spherical contact with the concave spherical portion. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the convex spherical portion may be in partial spherical contact with the concave spherical portion by the deformation of the frame. 
     In an aspect of the present disclosure, a drop-out mounting structure mounting a drop-out member as a wheel mounting unit to a bicycle frame through a bolt in a state that the drop-out member is set according to a predetermined reference position includes a wheel alignment unit provided between bolt fastening portions of the drop-out member and the frame and performing wheel alignment according to deformation of the frame, wherein the wheel alignment unit includes a protrusion pattern portion of which a part is crushed by the fastening force of the drop-out member and the frame due to the bolt. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the protrusion pattern portion includes crush protrusions formed to be integrally protruded and separated along an edge direction at a bolt fastening hole edge surface of the drop-out member. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the frame is made of a steel material, and the drop-out member is made of an aluminum material. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the wheel alignment aligning unit includes a washer interposed between bolt fastening portions of the drop-out member and the frame and the protrusion pattern portion is respectively formed at both side surfaces of the washer. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the frame and the drop-out member are made of a steel material, and the washer is made of an aluminum material and is provided in a ring shape having an inner space. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the protrusion pattern portion includes crush protrusions formed to be integrally protruded and separated along an edge direction at both side surfaces of the washer. 
     Further, an aspect of the present disclosure provides a drop-out mounting structure mounting a drop-out member as a wheel mounting unit to a bicycle frame through a bolt in a state that the drop-out member is set according to a predetermined reference position, including a wheel alignment unit provided at bolt fastening portions of the drop-out member and the frame and performing wheel alignment according to the deformation of the frame, wherein the wheel alignment unit includes a concave spherical portion respectively formed at the bolt fastening hole edge on both side surfaces of the drop-out member and a washer installed to be in spherical contact with the concave spherical portion. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the washer forms a convex spherical portion in spherical contact with the concave spherical portion at one side surface. 
     For the drop-out mounting structure according to an aspect of the present disclosure, one washer forms a flat surface supporting a head of the bolt at the other side surface. 
     For the drop-out mounting structure according to an aspect of the present disclosure, another washer forms the flat surface supporting the bolt fastening hole edge of the frame at the other side surface. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the bolt is fastened to a weld nut provided at the inside of the frame by penetrating the washer hole of the washer and the bolt fastening hole of the drop-out member and the frame. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the washer hole of the washer and the bolt fastening hole of the drop-out member are formed with a larger interior diameter than an exterior diameter of the bolt. 
     Further, an aspect of the present disclosure provides a drop-out mounting structure mounting a drop-out member as a wheel mounting unit to a bicycle frame through a bolt in a state that the drop-out member is set according to a predetermined reference position, including a wheel alignment unit provided at bolt fastening portions of the drop-out member and the frame and performing wheel alignment according to deformation of the frame, wherein the wheel alignment unit includes a first washer respectively installed at a washer mounting surface of the bolt fastening hole edge side on both side surfaces of the drop-out member and forming a concave spherical portion at the inner edge and a second washer installed to be in spherical contact with the concave spherical portion of each first washer. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the first washer forms the concave spherical portion at one side surface and the flat surface supporting the washer mounting surface at the other side surface. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the second washer forms a convex spherical portion in spherical contact with the concave spherical portion of the first washer at one side surface. 
     For the drop-out mounting structure according to an aspect of the present disclosure, one second washer forms the flat surface supporting the head of the bolt at the other side surface. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the other second washer forms the flat surface supporting the bolt fastening hole edge of the frame at the other side surface. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the bolt is fastened to a weld nut provided at the inside of the frame by penetrating the washer hole of the first and second washers and the bolt fastening hole of the drop-out member and the frame. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the washer hole of the first and second washers and the bolt fastening hole of the drop-out member are formed with a larger interior diameter than an exterior diameter of the bolt. 
     For the drop-out mounting structure according to an aspect of the present disclosure, the drop-out member forms the bolt fastening hole disposed in a triangle structure. 
     The aspects of the present disclosure may easily and correctly perform the wheel alignment through the wheel alignment unit without separate correction of the stay frame and separate adjustment of the drop-out member even if the stay frame is deformed by welding heat when manufacturing the bicycle frame. 
     Further, effects that can be obtained or expected from aspects of the present disclosure are directly or suggestively described in the following detailed description. That is, various effects expected from aspects of the present disclosure will be described in the following detailed description. 
     Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order that the disclosure may be well understood, there will now be described various forms thereof, given by way of example, reference being made to the accompanying drawings, in which: 
         FIG. 1  is a perspective view of an example of a bicycle frame to which a drop-out mounting structure is applied; 
         FIG. 2  is a schematic view showing a deformation state of a stay frame to which a drop-out mounting structure is applied; 
         FIG. 3  is an exploded perspective view of a drop-out mounting structure for wheel alignment according to a first aspect of the present disclosure; 
         FIG. 4  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to a first aspect of the present disclosure; 
         FIG. 5  is an exploded perspective view showing a drop-out mounting structure for wheel alignment according to a second aspect of the present disclosure; 
         FIG. 6  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to a second aspect of the present disclosure; 
         FIG. 7  is an exploded perspective view showing a drop-out mounting structure for wheel alignment according to a third aspect of the present disclosure; 
         FIG. 8  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to a third aspect of the present disclosure; 
         FIG. 9  is exploded perspective view showing a drop-out mounting structure for wheel alignment according to a fourth aspect of the present disclosure; 
         FIG. 10  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to a second aspect of the present disclosure; 
         FIG. 11  is exploded perspective view showing a drop-out mounting structure for wheel alignment according to a fifth aspect of the present disclosure; and 
         FIG. 12  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to a fifth aspect of the present disclosure. 
     
    
    
     The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. 
     DETAILED DESCRIPTION OF THE ASPECTS 
     The following description is merely in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features. 
     As those skilled in the art would realize, the described aspects may be modified in various different ways without departing from the spirit or scope of the present disclosure. 
     The size and thickness of each configuration shown in the drawings are arbitrarily shown for better understanding and ease of description, but the present disclosure is not limited thereto, and the thickness of layers, films, panels, regions, etc., may be exaggerated for clarity. 
     In the following detailed description, names of constituent elements which are in the same relationship are divided into “first”, “second”, and the like, but the present disclosure is not limited to the order in the following description. 
     In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. 
     In addition, the terms “ . . . unit”, “ . . . means”, “ . . . part”, and “ . . . member” described in the specification mean units of a general configuration performing at least one function or operation. 
       FIG. 1  is a perspective view of an example of a bicycle frame to which a drop-out mounting structure according to an aspect of the present disclosure is applied. 
     Referring to  FIG. 1 , a drop-out mounting structure for wheel alignment according to aspects of the present disclosure may be applied to a bicycle frame  1 . Furthermore, the drop-out mounting structure for the wheel alignment according to aspects of the present disclosure may be applied to the bicycle frame  1  made of in a shape of a closed section by welding left and right both side panels that are respectively stamping-molded to a predetermined shape. 
     For example, the above-described bicycle frame  1  may be configured of a head tube  2 , a seat tube  3 , a top tube  4 , a down tube  5 , left and right seat stays  6 , and left and right chain stays  7 . 
     The bicycle frame  1  having such a configuration may be configured of a stamping frame of a tube shape in which left and right panels are respectively stamp-molded in a predetermined shape and the stamp-molded left and right panels are assembled. 
     However, the scope of the present disclosure is not limited to the bicycle frame  1  manufactured by assembling both side panels that are stamp-molded in the predetermined shape to each other, and a technical scope of the present disclosure is also applicable to the bicycle frame manufactured by welding separately cut tubes. 
     In the above, the bicycle frame  1  may be composed of one frame or two or more divided frames. Also, the bicycle frame  1  may include various accessory components such as various brackets, a colorant, a rib, a block, etc. for mounting known technology bicycle parts. 
     However, since the various accessory components to mount the various parts to the bicycle frame  1 , the above-mentioned various accessory components are collectively referred to as the bicycle frame  1  except for an exceptional case in an aspect of the present disclosure. 
     On the other hand, in the above-mentioned bicycle frame  1 , the left seat stay  6  is integrally connected to the left chain stay  7 , and the right seat stay  6  is integrally connected to the right chain stay  7 . Here, the left and right seat stays  6  are connected to the seat tube  3 , and the left and right chain stays  7  are connected to a rear wheel rotary connection body. 
     Also, in the drop-out mounting structure for the wheel alignment according to aspects of the present disclosure as above-described, a drop-out member  10  as a wheel mounting unit is mounted at a position where the left and right seat stays  6  and chain stays  7  meet. 
     Hereinafter, a part where the drop-out member  10  is mounted may be referred to as “a stay frame  20 ” for convenience. Also, the drop-out member  10  may be respectively mounted at the left and right stay frames  20 , and an example in which the drop-out member  10  may be mounted at any one stay frame  20  is described hereinafter. Also, in the drawing, the shapes of the drop-out members  10  mounted at the left and right stay frames  20  may be the same, even when drop-out members  10  of different shapes from each other may be mounted at the left and right stay frames  20 . 
     Here, the drop-out member  10  may be fastened with the stay frame  20  through a bolt  8 . An axle insertion groove where an axle of a wheel hub is inserted to be mounted is formed in the drop-out member  10 , and the axle insertion groove has a structure that is opened downward, and is inclined forward at a predetermined angle. 
     On the other hand, as the bicycle frame  1  may be manufactured by welding both panels that are stamp-molded, the stay frame  20  to which the drop-out member  10  is mounted may be deformed by welding heat. 
     The stay frame  20  may be deformed by the welding heat as shown in  FIG. 2  as an example. That is, as shown in  FIG. 2( a ) , the part where the drop-out member  10  is formed (referring to  FIG. 1 ) may be deformed in a forth and back direction (an X-axis direction) due to the welding heat. Also, as shown in  FIG. 2( b ) , the part where the drop-out member  10  is formed may be deformed in a height direction (a Z-axis direction) due to the welding heat. 
     Accordingly, in an aspect of the present disclosure, when a reference position (reference coordinates of the X and Z axes) of the drop-out member  10  is deviated by the deformed stay frame  20 , the wheel alignment of the rear wheel must be performed by correcting the stay frame  20  or controlling the reference position of the drop-out member  10 . 
     Accordingly, the drop-out mounting structure for the wheel alignment according to aspects of the present disclosure is made of a structure that is capable of performing the wheel alignment without the correction of the stay frame  20  and the control of the drop-out member  10  even if the deformation of the stay frame  20  is generated due to the welding heat. 
     Furthermore, the aspects of the present disclosure provide the drop-out mounting structure of which the drop-out member  10  is mounted at the drop-out mounting unit of the stay frame  20  through the bolt  8  and the wheel alignment is performed corresponding to the deformation of the stay frame  20  in the state that the drop-out member  10  may be set (fixed) to be suitable at a predetermined reference position (the reference coordinates of the X and Z axes) through a standard (reference) jig (not shown in a drawing). 
       FIG. 3  is an exploded perspective view of a drop-out mounting structure for wheel alignment according to a first aspect of the present disclosure, and  FIG. 4  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to a first aspect of the present disclosure in different directions from each other. 
     Referring to  FIG. 3  and  FIG. 4 , the drop-out mounting structure  100  for the wheel alignment according to the first aspect of the present disclosure includes a wheel alignment unit  30  for performing the wheel alignment according to the deformation of the stay frame  20 . 
     That is, the wheel alignment unit  30  corresponds to the deformation of the stay frame  20 , and may be used to perform the wheel alignment by fastening the drop-out member  10  and the stay frame  20  through the bolt  8 . 
     In an aspect of the present disclosure, the wheel alignment unit  30  is provided to be in spherical contact with the bolt fastening portion of the drop-out member  10  and the stay frame  20  as a male and female type. 
     The wheel alignment unit  30  includes a concave spherical portion  31  formed at one bolt fastening portion of the drop-out member  10  and the stay frame  20 , and a convex spherical portion  35  formed at the other bolt fastening portion. 
     Here, the concave spherical portion  31  may be formed at the bolt fastening portion of the drop-out member  10 , and the convex spherical portion  35  may be formed at the bolt fastening portion of the stay frame  20 . Also, the concave spherical portion  31  may be formed at the bolt fastening portion of the stay frame  20 , and the convex spherical portion  35  may be formed at the bolt fastening portion of the drop-out member  10 . 
     However, in the drawing and hereinafter, an example in which the concave spherical portion  31  is formed at the bolt fastening portion of the drop-out member  10  and the convex spherical portion  35  is formed at the bolt fastening portion of the stay frame  20  is described. 
     On the other hand, the drop-out member  10  and the stay frame  20  may have bolt fastening holes  11  and  21  as the bolt fastening portion for fastening the bolt  8 . For example, three bolt fastening holes  11  and three bolt fastening holes  21  are formed at the drop-out member  10  and the stay frame  20 , respectively. Also, a weld nut  9  connected to the bolt fastening holes  21  may be provided inside the stay frame  20 . The weld nut  9  is fastened with the bolt  8  penetrating the bolt fastening holes  21  and is welded to the inner surface of the stay frame  20 . 
     Here, the bolt fastening holes  11  of the drop-out member  10  may be disposed in a structure of an equilateral triangle or an isosceles triangle to realize more accurate wheel alignment for the stay frame  20 . 
     In the above, the concave spherical portion  31  is formed at the bolt fastening hole  11  edge portion of the drop-out member  10 . The concave spherical portion  31  is formed at the bolt fastening hole  11  edge portion of the surface facing the stay frame  20 . The concave spherical portion  31  forms a spherical surface with a hemisphere shape that is substantially concave to the inside of the hole thereof at the edge portion of the bolt fastening hole  11 . 
     Also, the convex spherical portion  35  is formed at the bolt fastening hole  21  edge portion of the stay frame  20  by corresponding to the concave spherical portion  31  of the drop-out member  10 . The convex spherical portion  35  may be formed at the bolt fastening hole  21  edge portion of the surface facing the concave spherical portion  31  of the drop-out member  10 . 
     The convex spherical portion  35  forms the spherical surface with the hemisphere shape that may be substantially concave to the inside of the hole thereof at the edge portion of the bolt fastening hole  21 , thereby the spherical surface contact is possible with the spherical surface of the concave spherical portion  31 . 
     For example, the convex spherical portion  35  may be formed by cutting the upper portion of the hemisphere thereof at the hemisphere shape molded to be convex from the inside of the stay frame  20  to the outside surface. 
     The above-configured drop-out mounting structure  100  according to the first aspect of the present disclosure will now be described in detail with reference to the above-disclosed drawings. 
     First, in an aspect of the present disclosure, the left and right drop-out members  10  forming the axle insertion groove and the bolt fastening holes  11  and forming the concave spherical portion  31  on the bolt fastening holes  11  side are provided. Next, in an aspect of the present disclosure, the drop-out member  10  is set according to the predetermined reference position (the reference coordinates of the X and Z axes) through a reference jig. 
     Subsequently, in an aspect of the present disclosure, the bicycle frame  1  may be provided by bonding both stamp-molded panels by welding, and in this case, the bicycle frame  1  forming the bolt fastening holes  21  at the predetermined positions of the stay frame  20  and forming the convex spherical portion  35  on the bolt fastening holes  21  side is provided. 
     Next, in an aspect of the present disclosure, the stay frame  20  of the bicycle frame  1  is disposed at the drop-out member  10  side. In this case, in an aspect of the present disclosure, the bolt fastening holes  21  of the stay frame  20  may be target-disposed at the bolt fastening holes  11  of the drop-out member  10 . 
     In this process, in an aspect of the present disclosure, the stay frame  20  is disposed on the drop-out member  10  side and the convex spherical portion  35  of the stay frame  20  is in spherical contact with the concave spherical portion  31  of the drop-out member  10  so that the concave spherical portion  31  of the drop-out member  10  and the convex spherical portion  35  of the stay frame  20  face each other. 
     Next, in an aspect of the present disclosure, the bolt  8  is inserted into the bolt fastening hole  11  of the drop-out member  10  and the bolt fastening hole  21  of the stay frame  20 , and the bolt  8  may be rotated to be fastened with the weld nut  9  inside the stay frame  20 . Thus, in an aspect of the present disclosure, the drop-out member  10  may be mounted at the predetermined drop-out mounting unit of the stay frame  20  through the bolt  8 . 
     Here, when manufacturing the bicycle frame  1 , in the case that the deformation (the deformation of the X and Z axis directions) of the stay frame  20  is generated by the welding heat, in an aspect of the present disclosure, the concave spherical portion  31  of the drop-out member  10  and the convex spherical portion  35  of the stay frame  20  may not be in complete spherical contact (not entirely spherical-contacted), but are in partial spherical contact by the deformation of the stay frame  20 . 
     Accordingly, in an aspect of the present disclosure, in the state in which the concave spherical portion  31  and the convex spherical portion  35  may be in partial spherical contact by the deformation of the stay frame  20 , as the drop-out member  10  is mounted on the stay frame  20  through the bolt  8 , the wheel alignment may be performed corresponding to the deformation of the stay frame  20 . 
     Accordingly, in an aspect of the present disclosure, even if the deformation of the stay frame  20  is generated, the wheel alignment may be easily and correctly performed without correction of the stay frame  20  and adjustment of the drop-out member  10 . 
     In an aspect of the present disclosure, when the drop-out member  10  set according to the predetermined reference position is fixed to the stay frame  20  through the bolt  8 , the wheel alignment may be easily and correctly performed through the concave spherical portion  31  and the convex spherical portion  35  of the wheel alignment unit  30 . 
       FIG. 5  is an exploded perspective view showing a drop-out mounting structure for wheel alignment according to a second aspect of the present disclosure, and  FIG. 6  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to a second aspect of the present disclosure. In the drawing, the same configurations as in the previous aspect are indicated by the same reference numerals. 
     Referring to  FIG. 5  and  FIG. 6 , a drop-out mounting structure  200  for the wheel alignment according to the second aspect of the present disclosure may include a protrusion pattern portion  41  provided between the bolt fastening portions of the drop-out member  10  and the stay frame  20  as a wheel alignment unit  40 . 
     In an aspect of the present disclosure, the protrusion pattern portion  41  of the wheel alignment unit  40  is provided to be partially crushed by the fastening force of the drop-out member  10  and the stay frame  20  by the bolt  8  when the stay frame  20  is deformed. 
     Since the protrusion pattern portion  41  is integrally formed at the bolt fastening portion of the drop-out member  10  in an aspect of the present disclosure, it is integrally formed to be protruded at the edge surface of the bolt fastening hole  11  on one surface of the drop-out member  10  facing the stay frame  20 . 
     The protrusion pattern portion  41  includes crush protrusions  43  formed to be separately protruded along the edge direction thereof at the edge surface of the bolt fastening hole  11 . The crush protrusions  43  may be provided as the protrusions that are crushed by the external force through the drop-out member  10  and the stay frame  20 . 
     Here, the crush protrusions  43  of the protrusion pattern portion  41  are formed to be protruded from the inner side of the drop-out member  10  to the outside of one surface, and for example, the protrusions have a square shape. 
     In this case, the drop-out member  10  is formed of an aluminum material so that the crush protrusions  43  may be easily crushed by the external force, and the stay frame  20  is formed of a steel material so that the external force is applied to the crush protrusions  43 . 
     Next, the above-configured drop-out mounting structure  200  according to the second aspect of the present disclosure is described in detail with reference to the above-disclosed drawings. 
     First, an aspect of the present disclosure, the left and right drop-out members  10 , in which the axle insertion groove and the bolt fastening holes  11  are formed, and the crush protrusions  43  of the protrusion pattern portion  41 , are integrally formed at the bolt fastening holes  11  side, are provided. Next, in an aspect of the present disclosure, the drop-out member  10  may be set according to the predetermined reference position (the reference coordinates of the X and Z axes) through the reference jig. 
     Subsequently, in an aspect of the present disclosure, the bicycle frame  1  is provided by bonding stamp-molded both panels by the welding, and in this case, the bicycle frame  1  forming the bolt fastening holes  21  at the predetermined position of the stay frame  20  is provided. 
     Next, in an aspect of the present disclosure, the stay frame  20  of the bicycle frame  1  is disposed at the drop-out member  10  side. In this case, the bolt fastening holes  21  of the stay frame  20  is target-disposed at the bolt fastening holes  11  of the drop-out member  10 . 
     In this process, in an aspect of the present disclosure, the stay frame  20  is target-disposed at the drop-out member  10  side and the crush protrusions  43  is in contact with the bolt fastening hole  21  edge surface of the stay frame  20  so that the crush protrusions  43  of the drop-out member  10  and the bolt fastening hole  21  edge surface of the stay frame  20  face each other. 
     Next, the bolt  8  may be inserted into the bolt fastening hole  11  of the drop-out member  10  and the bolt fastening hole  21  of the stay frame  20 , and may be rotated to be fixed to the weld nut  9  inside the stay frame  20 . Thus, in an aspect of the present disclosure, the drop-out member  10  may be mounted at the predetermined drop-out mounting unit of the stay frame  20  through the bolt  8 . 
     Here, when manufacturing the bicycle frame  1 , in the case that the deformation (the deformation of the X and Z axes directions) of the stay frame  20  is generated by the welding heat, in an aspect of the present disclosure, the crush protrusions  43  are in partial contact with the bolt fastening holes  21  edge surface of the stay frame  20 . 
     Accordingly, in an aspect of the present disclosure, the part of the crush protrusions  43  in contact with the bolt fastening hole  21  edge surface of the stay frame  20  may be crushed by the fastening force of the drop-out member  10  and the stay frame  20  by the bolt  8 . 
     Also, in an aspect of the present disclosure, since a gap exists between the drop-out member  10  and the stay frame  20  by the deformation of the stay frame  20 , the rest of the crush protrusions  43  are disposed in the gap. 
     That is, in an aspect of the present disclosure, in the state in which the crush protrusions  43  of the protrusion pattern portion  41  are in partial contact with the bolt fastening hole  21  edge surface of the stay frame  20  by the deformation of the stay frame  20 , the drop-out member  10  may be mounted at the stay frame  20  through the bolt  8 . 
     Accordingly, in an aspect of the present disclosure, while the part of the crush protrusions  43  is crushed by the fastening force of the drop-out member  10  and the stay frame  20  due to the bolt  8 , the wheel alignment may be performed corresponding to the deformation of the stay frame  20 . 
     Accordingly, in an aspect of the present disclosure, even if the deformation of the stay frame  20  is generated, the wheel alignment may be easily and correctly performed without the correction of the stay frame  20  and the adjustment of the drop-out member  10 . 
     That is, in an aspect of the present disclosure, when the drop-out member  10  set according to the predetermined reference position is fixed to the stay frame  20  through the bolt  8 , the wheel alignment may be easily and correctly performed through the crush protrusions  43  of the protrusion pattern portion  41 . 
       FIG. 7  is an exploded perspective view showing a drop-out mounting structure for wheel alignment according to a third aspect of the present disclosure, and  FIG. 8  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to the third aspect of the present disclosure. In the drawing, the same configurations as in the previous aspect are indicated by the same reference numerals. 
     Referring to  FIG. 7  and  FIG. 8 , a drop-out mounting structure  300  for the wheel alignment according to the third aspect of present disclosure may configure a wheel alignment unit  50  including a washer  52  interposed between the drop-out member  10  and the bolt fastening portion of the stay frame  20  and respectively forming a protrusion pattern portion  51  at both side surfaces of the washer  52 . 
     In an aspect of the present disclosure, the washer  52  may be provided with a ring shape forming a washer hole  55  at the center side while passing through the inner space. The washer  52  is disposed between the edge surfaces of the bolt fastening holes  11  and  21  between the bolt fastening holes  11  of the drop-out member  10  and the bolt fastening holes  21  of the stay frame  20 , which face each other and are matched. 
     Also, the protrusion pattern portion  51  may be formed to be integrally protruded at both side surfaces of the washer  52  corresponding to the bolt fastening holes  11  and  21  edge surfaces of the drop-out member  10  and the stay frame  20 . The protrusion pattern portion  51  includes crush protrusions  53  formed to be separated and protruded along the edge direction of the washer  52 . 
     The crush protrusions  53  are provided as the protrusions that may be crushed by the external force through the drop-out member  10  and the stay frame  20 . The crush protrusions  53  are formed to be protruded from the inside of the washer  52  to both surface outsides, and for example, provided as protrusions with a square shape. 
     Here, the washer  52  is made of the aluminum material so that the crush protrusions  53  are easily crushed by the external force, and the drop-out member  10  and the stay frame  20  are made of the steel material to apply the external force to the crush protrusions  53 . 
     Next, the above-configured drop-out mounting structure  300  according to the third aspect of the present disclosure is described in detail with reference to the above-disclosed drawings. 
     First, in an aspect of the present disclosure, the left and right drop-out members  10  forming the axle insertion groove and the bolt fastening holes  11  are provided. Next, in an aspect of the present disclosure, the drop-out member  10  is set according to the predetermined reference position (the reference coordinates of the X and Z axes) through the reference jig. 
     Subsequently, in an aspect of the present disclosure, the washer  52  forming the crush protrusions  53  of the protrusion pattern portion  51  at both side surfaces is provided. Also, in an aspect of the present disclosure, the bicycle frame  1  is provided by bonding both stamp-molded panels that by the welding, and in this case, the bicycle frame  1  forming the bolt fastening holes  21  at the predetermined position of the stay frame  20  is provided. 
     Next, in an aspect of the present disclosure, the stay frame  20  of the bicycle frame  1  is disposed at the drop-out member  10  side. In this case, in an aspect of the present disclosure, the bolt fastening holes  21  of the stay frame  20  are target-disposed at the bolt fastening holes  11  of the drop-out member  10 . 
     In this process, the washer  52  may be disposed between the edge surfaces of the bolt fastening holes  11  and  21  of the drop-out member  10  and the stay frame  20  facing each other, and the stay frame  20  is target-disposed at the drop-out member  10  side. 
     That is, in an aspect of the present disclosure, the crush protrusions  53  of both side surfaces of the washer  52  are in contact with the bolt fastening holes  11  and  21  edge surfaces of the drop-out member  10  and the stay frame  20 , and the stay frame  20  is target-disposed at the drop-out member  10  side. 
     Next, in an aspect of the present disclosure, the bolt  8  is inserted into the bolt fastening hole  11  of the drop-out member  10 , the washer hole  55  of the washer  52 , and the bolt fastening hole  21  of the stay frame  20 , and the bolt  8  is rotated to be fastened with the weld nut  9  of the stay frame  20  inside. Thus, in an aspect of the present disclosure, the drop-out member  10  may be mounted at the predetermined drop-out mounting unit of the stay frame  20  through the bolt  8 . 
     Here, when manufacturing the bicycle frame  1 , in the case that the deformation (the deformation of the X and Z axes directions) of the stay frame  20  is generated by the welding heat, the crush protrusions  53  are in partial contact with the bolt fastening holes  11  edge surface of the stay frame  10 . The crush protrusions  53  of the other side surface of the washer  52  are in partial contact with the bolt fastening holes  21  edge surface of the stay frame  20 . 
     Accordingly, in an aspect of the present disclosure, the part of the crush protrusions  53  in contact with the bolt fastening holes  11  and  21  edge surfaces of the drop-out member  10  and stay frame  20  is crushed by the fastening force of the drop-out member  10  and the stay frame  20  by the bolt  8 . 
     Also, in an aspect of the present disclosure, since the gap exists between the drop-out member  10  and the stay frame  20  by the deformation of the stay frame  20 , the rest of the crush protrusions  53  are disposed in the gap. 
     That is, in an aspect of the present disclosure, in the state in which the part of the crush protrusions  53  of both side surfaces of the washer  52  is in contact with the bolt fastening holes  11  and  21  edge surfaces of the drop-out member  10  and the stay frame  20  by the deformation of the stay frame  20 , the drop-out member  10  may be mounted at the stay frame  20  through the bolt  8 . 
     Accordingly, in an aspect of the present disclosure, while the part of the crush protrusions  53  is crushed by the fastening force of the drop-out member  10  and the stay frame  20  due to the bolt  8 , the wheel alignment may be performed corresponding to the deformation of the stay frame  20 . 
     Accordingly, in an aspect of the present disclosure, even if the deformation of the stay frame  20  is generated, the wheel alignment may be easily and correctly performed without the correction of the stay frame  20  and the adjustment of the drop-out member  10 . 
     In an aspect of the present disclosure, when the drop-out member  10  set according to the predetermined reference position is fixed to the stay frame  20  through the bolt  8 , the wheel alignment may be easily and correctly performed through the crush protrusions  53  of the protrusion pattern portion  51  provided at both side surfaces of the washer  52 . 
       FIG. 9  is exploded perspective view showing a drop-out mounting structure for wheel alignment according to a fourth aspect of the present disclosure, and  FIG. 10  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to a second aspect of the present disclosure. In the drawings, the same configurations as in the previous aspect are indicated by the same reference numerals. 
     Referring to  FIG. 9  and  FIG. 10 , a drop-out mounting structure  400  for the wheel alignment according to the fourth aspect of the present disclosure may configure a wheel alignment unit  60  including a concave spherical portion  61  respectively formed at the edge of the bolt fastening holes  11  on both side surfaces of the drop-out member  10  and a washer  65  installed to be in spherical contact with the concave spherical portion  61 . 
     In an aspect of the present disclosure, the concave spherical portion  61  may be formed at the bolt fastening holes  11  edge portions of both side surfaces of the drop-out member  10 . The concave spherical portion  61  is formed at the edge portion of the bolt fastening hole  11  corresponding to the head of the bolt  8  on one side surface of the drop-out member  10 . Also, the concave spherical portion  61  is formed at the edge portion of the bolt fastening hole  11  of the surface facing the stay frame  20  on the other side surface of the drop-out member  10 . 
     The concave spherical portion  61  forms the spherical surface of the approximate hemisphere shape that is concave from the edge portion of the bolt fastening holes  11  to the inside thereof on both side surfaces of the drop-out member  10 . 
     In an aspect of the present disclosure, the washer  65  is provided as the washer of the ring shape having a washer hole  66  at the center. One washer  65  is disposed at the concave spherical portion  61  side on one side surface of the drop-out member  10 . 
     Also, another washer  65  is disposed at the concave spherical portion  61  side on the other side surface of the drop-out member  10  between the bolt fastening hole  11  of the drop-out member  10  and the bolt fastening hole  21  of the stay frame  20 , which face each other and are matched. 
     In an aspect of the present disclosure, the washers  65  may form a convex spherical portion  67  in spherical contact with each concave spherical portion  61  at one side surface. 
     The convex spherical portion  67  forms the spherical surface of an approximate hemisphere shape that is convex from the edge portion of the washer hole  66  to the outside and is provided to be in spherical contact with the spherical surface of each concave spherical portion  61  as the male and female type. 
     Here, one washer  65  forms a flat surface  68  supporting the head portion of the bolt  8  at the other side surface, and another washer  65  forms the flat surface  68  supporting the bolt fastening hole  21  edge of the stay frame  20  at the other side surface. 
     On the other hand, in an aspect of the present disclosure, the bolt  8  may be fastened with the weld nut  9  provided at the inside of the stay frame  20  by passing through the washer hole  66  of the washer  65  and the bolt fastening holes  11  and  21  of the drop-out member  10  and the stay frame  20 . 
     In this case, the washer hole  66  of the washer  65  and the bolt fastening hole  11  of the drop-out member  10  may be formed with an interior diameter that is larger than an exterior diameter of the bolt  8  (a pitch exterior diameter). 
     Next, the above-configured drop-out mounting structure  400  according to the fourth aspect of the present disclosure is described in detail with reference to the above-disclosed drawings. 
     First, in an aspect of the present disclosure, the left and right drop-out members  10  forming the concave spherical portion  61  at the axle insertion groove, the bolt fastening holes  11 , and the bolt fastening holes  11  edges of both side surfaces are provided. Next, in an aspect of the present disclosure, the drop-out member  10  is set according to the predetermined reference position (the reference coordinates of the X and Z axes) through the reference jig. 
     Subsequently, in an aspect of the present disclosure, two washers  65  forming the convex spherical portion  67  at the washer hole  66  edge of one side surface are provided. Also, in an aspect of the present disclosure, the bicycle frame  1  is provided by bonding both stamp-molded panels by the welding, and in this case, the bicycle frame  1  forming the bolt fastening holes  21  at the predetermined position of the stay frame  20  is provided. 
     Next, in an aspect of the present disclosure, the stay frame  20  of the bicycle frame  1  is disposed at the drop-out member  10  side. In this case, in an aspect of the present disclosure, the bolt fastening holes  21  of the stay frame  20  are target-disposed at the bolt fastening holes  11  of the drop-out member  10 . 
     In this process, in an aspect of the present disclosure, one washer  65  may be disposed at the concave spherical portion  61  of one side surface of the drop-out member  10 . Also, in an aspect of the present disclosure, the other washer  65  is disposed at the concave spherical portion  61  of the other side surface of the drop-out member  10  between the facing bolt fastening holes  11  and  21  edges of the drop-out member  10  and the stay frame  20 , and the stay frame  20  is target-disposed at the drop-out member  10  side. 
     Alternatively, in an aspect of the present disclosure, in the state in which the convex spherical portion  67  of the washers  65  is in spherical contact with the concave spherical portion  61  of both side surfaces of the drop-out member  10 , the stay frame  20  may be target-disposed at the drop-out member  10  side. 
     Next, in an aspect of the present disclosure, the bolt  8  is inserted into the bolt fastening hole  11  of the drop-out member  10 , the washer hole  66  of the washers  65 , and the bolt fastening hole  21  of the stay frame  20 . 
     Also, in an aspect of the present disclosure, the bolt  8  is rotated to be fastened with the weld nut  9  inside the stay frame  20 . Thus, in an aspect of the present disclosure, the drop-out member  10  may be mounted at the predetermined drop-out mounting unit of the stay frame  20  through the bolt  8 . 
     In this case, the washer  65  supports the head portion of the bolt  8  through the flat surface  68  at one side surface of the drop-out member  10 , and the washer  65  supports the bolt fastening hole  21  edge of the stay frame  20  through the flat surface  68  at the other side surface of the drop-out member  10 . 
     Here, when manufacturing the bicycle frame  1 , in the case that the deformation (the deformation of the X and Z axes directions) of the stay frame  20  is generated by the welding heat, in the process of fastening the bolt  8 , the washers  65  and the bolt  8  are distorted by the deformation amount of the stay frame  20  and fastened by the fastening force of the drop-out member  10  and the stay frame  20  by the bolt  8 . 
     Since the washer hole  66  of the washer  65  and the bolt fastening hole  11  of the drop-out member  10  may be formed with a larger interior diameter than the exterior diameter of the bolt  8 , the washers  65  and the bolt  8  are distorted in one side and fastened while sliding by the deformation amount of the stay frame  20  along the spherical surface of the concave spherical portion  61  in the state that the convex spherical portion  67  of the washer  65  is in spherical contact with the concave spherical portion  61 . 
     Accordingly, in an aspect of the present disclosure, the wheel alignment may be performed corresponding to the deformation of the stay frame  20  while the washers  65  and the bolt  8  are distorted by the deformation amount of the stay frame  20  and fastened through the concave spherical portion  61  by the fastening force of the drop-out member  10  and the stay frame  20  due to the bolt  8 . 
     Accordingly, in an aspect of the present disclosure, even if the deformation of the stay frame  20  is generated, the wheel alignment may be easily and correctly performed without the correction of the stay frame  20  and the adjustment of the drop-out member  10 . 
       FIG. 11  is an exploded perspective view showing a drop-out mounting structure for wheel alignment according to a fifth aspect of the present disclosure, and  FIG. 12  is an assembled cross-sectional schematic diagram showing a drop-out mounting structure for wheel alignment according to the fifth aspect of the present disclosure. In the drawing, the same configurations as in the previous aspect are indicated by the same reference numerals. 
     Referring to  FIG. 11  and  FIG. 12 , a drop-out mounting structure  500  for the wheel alignment according to the fifth aspect of the present disclosure may configure a wheel alignment unit  70  having a first washer  71  and a second washer  81  provided at the bolt fastening portion of the drop-out member  10  and the stay frame  20 . 
     In an aspect of the present disclosure, the first washer  71  is respectively installed at a washer mounting surface  19  of the bolt fastening hole  11  edge on both side surfaces of the drop-out member  10 . Two first washers  71  are provided as the washer of the ring shape having a washer hole  72  at the center. 
     The first washers  71  may form a concave spherical portion  73  at the inner edge of one side surface, that is, the edge of the washer hole  72 . The concave spherical portion  73  is formed at the washer hole  72  edge of one side surface corresponding to the head portion of the bolt  8  for the first washer  71  disposed at the washer mounting surface  19  on one side surface of the drop-out member  10 . Also, the concave spherical portion  73  is formed at the washer hole  72  edge of one side surface corresponding to the bolt fastening hole  21  of the stay frame  20  for the first washer  71  disposed at the washer mounting surface  19  on the other side surface of the drop-out member  10 . 
     The concave spherical portion  73  forms the spherical surface of the approximate hemisphere shape that is concave from the edge portion of the washer hole  72  to the inside thereof on one side surface of the first washer  71 . 
     Here, the first washers  71  form the above-mentioned concave spherical portion  73  at one side surface and a flat surface  75  supporting the washer mounting surface  19  at the other side surface. 
     In an aspect of the present disclosure, the second washer  81  is installed to be in spherical contact with each concave spherical portion  73  of the first washer  71 . Two second washers  81  are provided as the washer of the ring shape having a washer hole  82  at the center. 
     One second washer  81  is disposed at the concave spherical portion  73  side of the first washer  71  on one side surface of the drop-out member  10 . Also, the other second washer  81  is disposed between the bolt fastening holes  11  of the drop-out member  10  and the bolt fastening holes  21  of the stay frame  20 , which face each other and are matched, that is, is disposed at the concave spherical portion  73  side of the first washer  71  on the other side surface of the drop-out member  10 . 
     In an aspect of the present disclosure, the second washers  81  forms a convex spherical portion  83  in spherical contact with the concave spherical portion  73  of the first washer  71  at one side surface. 
     The convex spherical portion  83  is formed at the edge portion of the washer hole  82  on one side surface of the second washer  81  and forms the spherical surface of the approximate hemisphere shape which is convex outside thereof at the edge portion of the washer hole  82 , thereby being in spherical contact with the spherical surface of the concave spherical portion  73  of the first washer  71 . 
     Here, one second washer  81  forms a flat surface  85  supporting the head portion of the bolt  8  at the other side surface, and the other second washer  81  forms the flat surface  85  supporting the bolt fastening hole  21  edge of the stay frame  20  at the other side surface. 
     On the other hand, in an aspect of the present disclosure, the bolt  8  may be fastened to the weld nut  9  provided inside the stay frame  20  while penetrating the washer holes  72  and  82  of the first and second washers  71  and  81  and the bolt fastening holes  11  and  21  of the drop-out member  10  and the stay frame  20 . 
     In this case, the washer holes  72  and  82  of the first and second washers  71  and  81  and the bolt fastening hole  11  of the drop-out member  10  may be formed with a larger interior diameter than the exterior diameter of the bolt  8  (the pitch exterior diameter). 
     Next, the above-configured drop-out mounting structure  500  according to the fifth aspect of the present disclosure is described in detail with reference to the above-disclosed drawings. 
     First, in an aspect of the present disclosure, the left and right drop-out members  10  forming the washer mounting surface  19  at the axle insertion groove, the bolt fastening holes  11 , and the bolt fastening holes  11  edge side of both side surfaces are provided. Next, in an aspect of the present disclosure, the drop-out member  10  is set according to the predetermined reference position (the reference coordinates of the X and Z axes) through the reference jig. 
     Subsequently, in an aspect of the present disclosure, two first washers  71  forming the concave spherical portion  73  at the washer hole  72  edge of one side surface and two second washers  81  forming the convex spherical portion  83  at the washer hole  82  edge of one side surface are provided. 
     Also, in an aspect of the present disclosure, the bicycle frame  1  is provided by bonding both stamp-molded panels by the welding, and in this case, the bicycle frame  1  forming the bolt fastening holes  21  at the predetermined position of the stay frame  20  is provided. 
     Next, in an aspect of the present disclosure, the stay frame  20  of the bicycle frame  1  is disposed at the drop-out member  10  side. In this case, in an aspect of the present disclosure, the bolt fastening holes  21  of the stay frame  20  are target-disposed at the bolt fastening holes  11  of the drop-out member  10 . 
     In this process, in an aspect of the present disclosure, the first washer  71  is respectively disposed at the washer mounting surface  19  on both side surfaces of the drop-out member  10 . Here, the flat surface  75  of the first washer  71  supports the washer mounting surface  19 . 
     Also, in an aspect of the present disclosure, the second washer  81  is disposed at the concave spherical portion  73  of each first washer  71 . In this case, in an aspect of the present disclosure, one second washer  81  is target-disposed at the concave spherical portion  73  of the first washer  71  on one side surface of the drop-out member  10 . 
     Also, in an aspect of the present disclosure, the other second washer  81  is target-disposed at the concave spherical portion  73  of the first washer  71  disposed on the other side surface of the drop-out member  10  between the bolt fastening holes  11  and  21  edges of the drop-out member  10  and stay frame  20  facing each other. 
     Alternatively, in an aspect of the present disclosure, in the state that the convex spherical portion  83  of the second washers  81  is in spherical contact with the concave spherical portion  73  of the first washer  71 , the stay frame  20  may be target-disposed at the drop-out member  10  side. 
     Next, in an aspect of the present disclosure, the bolt  8  is inserted into the bolt fastening hole  11  of the drop-out member  10 , the washer holes  72  and  82  of the first and second washers  71  and  81 , and the bolt fastening hole  21  of the stay frame  20 . 
     Also, in an aspect of the present disclosure, the bolt  8  is rotated to be fastened with the weld nut  9  inside the stay frame  20 . Thus, in an aspect of the present disclosure, the drop-out member  10  may be mounted at the predetermined drop-out mounting unit of the stay frame  20  through the bolt  8 . 
     In this case, the second washer  81  supports the head portion of the bolt  8  through the flat surface  85  on one side surface of the drop-out member  10 , and the second washer  81  supports the bolt fastening hole  21  edge of the stay frame  20  through the flat surface  85  on the other side surface of the drop-out member  10 . 
     Here, when manufacturing the bicycle frame  1 , in the case that the deformation (the deformation of the X and Z axis directions) of the stay frame  20  is generated by the welding heat, in the process of fastening the bolt  8 , the second washers  81  and the bolt  8  are distorted and fastened by the deformation amount of the stay frame  20  by the fastening force of the drop-out member  10  and the stay frame  20  due to the bolt  8 . 
     Since the washer holes  72  and  82  of the first and second washers  71  and  81  and the bolt fastening hole  11  of the drop-out member  10  are formed with the larger interior diameter than the exterior diameter of the bolt  8 , in the state that the convex spherical portion  83  of the second washer  81  is in spherical contact with the concave spherical portion  73  of the first washer  71 , the second washers  81  and the bolt  8  are distorted in one side and fastened while sliding along the spherical surface of the concave spherical portion  73  by the deformation amount of the stay frame  20 . 
     Accordingly, in an aspect of the present disclosure, the wheel alignment may be performed corresponding to the deformation of the stay frame  20  while the second washers  81  and the bolt  8  are distorted and fastened by the deformation amount of the stay frame  20  through the concave spherical portion  73  of the first washer  71  by the fastening force of the drop-out member  10  and the stay frame  20  due to the bolt  8 . 
     Accordingly, in an aspect of the present disclosure, even if the deformation of the stay frame  20  is generated, the wheel alignment may be easily and correctly performed without the correction of the stay frame  20  and the adjustment of the drop-out member  10 . 
     As described so far, according to the drop-out mounting structure for the wheel alignment according to the aspects of the present disclosure, when mounting the drop-out member  10  to the stay frame  20  through the bolt  8  in the state that the drop-out member  10  is set according to the predetermined reference position through the reference jig, the wheel alignment may be performed through the wheel alignment units  30 ,  40 ,  50 ,  60 , and  70 . 
     Accordingly, in the aspects of the present disclosure, when manufacturing the bicycle frame  1 , even if the stay frame  20  is deformed by the welding heat, the wheel alignment may be easily and correctly performed through the wheel alignment units  30 ,  40 ,  50 ,  60 , and  70  without the separate correction of the stay frame  20  and the separate adjustment of the drop-out member  10 . 
     Accordingly, in the aspects of the present disclosure, the loss of the power transmitted to the wheel may be reduced, the uneven wear of the tire may be reduced, and the damage to the bicycle frame  1  due to the fatigue endurance in a one-sided direction may be reduced. 
     Also, in the aspects of the present disclosure, in the bicycle frame  1 , it is possible to produce a substantially uniform product regardless of thermal deformation by the welding when manufacturing the bicycle frame  1 , and a work amount for the wheel alignment quality may be reduced when assembling the drop-out member  10  and the stay frame  20 , thereby improving the assembling productivity of the bicycle. 
     Furthermore, in the aspects of the present disclosure, it is possible to inhibit warpage of the bicycle frame  1  due to external impact, it is possible to obtain a substantially uniform quality of the wheel alignment, and the endurance quality of the bicycle frame  1  may be improved by the setting of the wheel alignment. 
     While this disclosure has been described in connection with practical aspects, it is to be understood that the disclosure is not limited to the disclosed aspects, but, on the contrary, covers various modifications and equivalent arrangements included within the spirit and scope of the present disclosure. 
     
       
         
           
               
             
               
                   
               
               
                 &lt;Description of symbols&gt; 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                 1: bicycle frame 
                 2: head tube 
               
               
                 3: seat tube 
                 4: top tube 
               
               
                 5: down tube 
                 6: seat stay 
               
               
                 7: chain stay 
                 8: bolt 
               
               
                 9: nut 
                 10: drop-out member 
               
               
                 11, 21: bolt fastening hole 
                 19: washer mounting surface 
               
               
                 20: stay frame 
               
               
                 30, 40, 50, 60, 70: wheel alignment unit 
               
               
                 31, 61, 73: concave spherical portion 
                 35, 67, 83: convex spherical 
               
               
                   
                 portion 
               
               
                 41, 51: protrusion pattern portion 
                 43, 53: crush protrusion 
               
               
                 52, 65: washer 
                 55, 66, 72, 82: washer hole 
               
               
                 68, 75, 85: flat surface 
                 71: first washer 
               
               
                 81: second washer