Patent Publication Number: US-2021171139-A1

Title: System for mounting a door hinge of a vehicle

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0162857 filed in the Korean Intellectual Property Office on Dec. 9, 2019, the entire contents of which are incorporated herein by reference. 
     BACKGROUND OF THE DISCLOSURE 
     (a) Field of the Disclosure 
     The present disclosure relates to a system for automatically mounting a door hinge of a vehicle. 
     (b) Description of the Related Art 
     In general, the process for mounting a door to a vehicle body includes mounting a door hinge to the front and rear pillars of the vehicle body, and then fastening the door to the door hinge. 
     In order to mount the door hinge, when the vehicle body enters a working position through a conveyor system, door hinges are tightly contacted to upper and lower door hinge mounting portions of front and rear pillars by using door hinge mounting jigs. The door hinges are bolt engaged to the door hinge mounting portions. 
     The door hinge mounting jig clamps the door hinge and moves forward to the pillar of the vehicle body. The door hinge mounting jig then inserts a tooling pin into the vehicle body and clamps the vehicle body. The door hinge mounting jig may correctly position the door hinge to the upper and lower door hinge mounting portions of the front and rear pillars. 
     Conventionally, to actively cope with mixed production of multiple types of vehicles, each door hinge mounting jig clamps a door hinge that is different according to vehicle types. Therefore, it may be required to develop different door hinge mounting jigs respectively to install door hinges to door hinge mounting portions of different vehicle types. 
     According to such conventional art, a hinge clamping unit may be required to include a plurality of cylinder devices to simultaneously clamp door hinges and to align the door hinges to predetermined positions. Therefore, weight and volume of a hinge clamping unit may increase, thereby increasing weight and volume of the entire jig equipment. 
     Therefore, according to conventional art, due to an increase of weight and volume of the entire jig equipment, it may be difficult to simultaneously mount door hinges at upper and lower door hinge mounting portions of the front and rear pillars. Alternatively, mounting door hinges to the front and rear pillars by separate processes may increase process costs and costs for the jig equipment. 
     The above information disclosed in this Background section is only to enhance understanding of the background of the disclosure. Therefore, the Background may contain information that is not prior art that is already known in this country to a person of ordinary skill in the art. 
     SUMMARY OF THE DISCLOSURE 
     The present disclosure has been made in an effort to provide a system for mounting a door hinge of a vehicle having advantages including the capability of coping with flexible manufacturing of multiple types of vehicles and enabling reduction of weight and volume. 
     In one embodiment, the system is for mounting a door hinge to upper and lower mounting portions of front and rear pillars of a vehicle body being transferred along a vehicle transfer line. The system includes: a jig frame installed to reciprocate in a vehicle width direction through a driving unit on a base frame outside the vehicle transfer line; a rotation index installed on the jig frame and rotatable by a predetermined angle through a servomotor; a vertical rotation shaft formed as a polyhedron having a cavity and coaxially connected to a rotation center axis of the rotation index along an up and down vertical direction; and a pair of clamping units installed through a mounting plate to a base plate fixed to each side of the vertical rotation shaft, disposed at upper and lower portions of the mounting plate, and configured to clamp the door hinge. 
     The rotation index may be coupled to a hollow driveshaft connected to the servomotor on the jig frame. 
     Cavity centers of the driveshaft and the vertical rotation shaft may be coaxially connected to each other along an up and down direction. 
     Each of the clamping units may include a first driving cylinder fixedly installed to the mounting plate and a movable block having a pair of tooling pins fitted into a tooling hole provided at the door hinge, the moveable block being connected to an operation rod of the first driving cylinder through a movable bracket. Each of the clamping units may also include a fixed block having a clamp hole fitted with the tooling pin penetrating the tooling hole of the door hinge and being fixedly installed to the mounting plate. 
     The movable block may move backward by the backward operation of the first driving cylinder and clamp the door hinge through the fixed block. 
     The clamping unit may include a second driving cylinder fixedly installed to the mounting plate through a fixing bracket and a stopping block connected to an operation rod of the second driving cylinder. The clamping unit may be configured to support the door hinge clamped between the movable block and the fixed block. 
     The system for mounting a door hinge of a vehicle according to an embodiment may further include: a floating body slidably coupled to the base plate in an up and down direction; a first floating member connected to the mounting plate, coupled to the floating body slidably along the vehicle length direction of the vehicle body, and configured to support a forward and backward movement of the mounting plate; and a second floating member installed to the base plate correspondingly to a bottom end of the floating body, and configured to support an up and down movement of the floating body. 
     The first floating member may include at least one rail block fixedly coupled to the mounting plate and slidably coupled along the vehicle length direction of the vehicle body to a guide rail provided on the floating body. 
     The second floating member may include a mounting block fixedly installed on the base plate along the vehicle length direction of the vehicle body, and a plurality of cushion cylinders installed to the mounting block with a predetermined spacing. The plurality of cushion cylinders may be configured to support the bottom end of the floating body. 
     In another embodiment, the system is for mounting a door hinge to upper and lower mounting portions of front and rear pillars of a vehicle body transferred along a vehicle transfer line. The system includes: a jig frame installed to reciprocate in a vehicle width direction through a driving unit on a base frame outside the vehicle transfer line; a rotation index rotatably installed on the jig frame by a predetermined angle through a servomotor, and coupled to a hollow driveshaft connected to the servomotor; a vertical rotation shaft formed as a polyhedron having a cavity and coaxially connected to the rotation index along an up and down vertical direction; a bezel fixing unit fixedly installed to the jig frame by penetrating the cavity of the driveshaft and the cavity of the vertical rotation shaft, and configured to interiorly hold an electric cable and an air-supply tube; and a pair of clamping units installed through a mounting plate to a base plate fixed to each side of the vertical rotation shaft, disposed at upper and lower portions of the mounting plate, and configured to clamp the door hinge. 
     The bezel fixing unit may include: a post member formed in a cylindrical shape and fixed to the jig frame through cavities of the driveshaft and the vertical rotation shaft; a bezel guide member having a plurality of penetration holes fitted with the electric cable and the air-supply tube through an interior of the post member, and being connected to the post member; and a union joint connecting the post member and the bezel guide member. 
     The penetration holes may include a first penetration hole penetrating the bezel guide member in an up and down direction and fitted with the electric cable, and a second penetration hole being separate from the first penetration hole, formed along the up and down direction of the bezel guide, penetrating exterior circumference surfaces of the bezel guide member, and fitted with the air-supply tube. 
     The bezel fixing unit further may include a base member formed in a cylindrical shape having an opening portion, disposed at a bottom end of the post member, and fixed to the jig frame. 
     The vertical rotation shaft may be formed as a polyhedron having four surfaces. 
     In another embodiment, the system is for mounting a door hinge to upper and lower mounting portions of front and rear pillars of a vehicle body being transferred along a vehicle transfer line. The system includes: a jig frame installed to reciprocate in a vehicle width direction through a driving unit on a base frame outside the vehicle transfer line; a rotation index rotatably installed on the jig frame by a predetermined angle through a servomotor, and coupled to a hollow driveshaft connected to the servomotor; a vertical rotation shaft formed as a polyhedron having a cavity and coaxially connected to the rotation index along an up and down vertical direction; a bezel fixing unit fixedly installed to the jig frame by penetrating the cavity of the driveshaft and the cavity of the vertical rotation shaft, and configured to interiorly hold an electric cable and an air-supply tube; a pair of clamping units installed through a mounting plate to a base plate fixed to each side of the vertical rotation shaft, disposed at upper and lower portions of the mounting plate, and configured to clamp the door hinge; at least one centering block fixedly installed to the mounting plate, inserted into a center hole provided at the vehicle body, and holding a reference point of the mounting plate with respect to the vehicle body; at least one supporting block fixedly installed to the mounting plate, and configured to support an outer panel of the vehicle body; and a vehicle body clamper rotatably installed to the mounting plate to clamp the vehicle body. 
     The jig frame may be slidably coupled to a guide rail installed on the base frame in the vehicle width direction. 
     The driving unit may be installed to the base frame and comprise a main driving cylinder connected to the jig frame. 
     The centering block may be formed in a shape of which a cross-section gradually increases as the centering block moves away from the vehicle body. 
     The supporting block may be formed in a shape of a rectangular block of rubber material. 
     The vehicle body clamper may include a rotation cylinder fixedly installed to the mounting plate, and a clamping block connected to a rotation rod of the rotation cylinder. The clamping block may be configured to clamp an interior side of the vehicle body. 
     A system for mounting a door hinge of a vehicle according to embodiments disclosed herein may be used to actively cope with mixed production of multiple types of vehicles. The system may provide reduction of weight and volume of an entire apparatus, cost reduction due to process reduction, improvement of work efficiency and productivity, and more working degree of freedom. 
     Further, effects that can be obtained or expected from embodiments disclosed herein are directly or suggestively described in the following detailed description. In other words, various effects expected from embodiments disclosed herein are described in the following detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings are intended to be used as references for describing the embodiments, and the accompanying drawings should not be construed as limiting the technical spirit of the present disclosure. 
         FIG. 1  schematically shows a door hinge mounting structure of a vehicle body according to an embodiment. 
         FIG. 2  is a perspective view of a system for mounting a door hinge of a vehicle according to an embodiment. 
         FIG. 3  and  FIG. 4  illustrate a rotation index applied to a system for mounting a door hinge of a vehicle according to an embodiment. 
         FIGS. 5-7  respectively illustrate a bezel fixing unit applied to a system for mounting a door hinge of a vehicle according to an embodiment. 
         FIGS. 8-11  respectively illustrate a clamping unit applied to a system for mounting a door hinge of a vehicle according to an embodiment. 
         FIG. 12  illustrates a floating structure applied to a system for mounting a door hinge of a vehicle according to an embodiment. 
         FIG. 13  illustrates a part of a system for mounting a door hinge of a vehicle according to an embodiment. 
     
    
    
     DESCRIPTION OF SYMBOLS 
     
         
         
           
               1 : vehicle body 
               2 : pillar 
               3 : door hinge 
               4 : door hinge mounting portion 
               5 : hinge bracket 
               5   a : first fastening hole 
               6 : door bracket 
               6   a : second fastening hole 
               6   b : tooling hole 
               7 : hinge pin 
               8 : bolt hole 
               9 : center hole 
             S: rotation center axis 
               10 : base frame 
               30 : jig frame 
               31 : driving unit 
               33 ,  215 ,  313 : guide rail 
               35 : main driving cylinder 
               50 : rotation index 
               51 : servomotor 
               53 : driveshaft 
               70 : vertical rotation shaft 
               71 : polyhedron 
               100 : door hinge mounting apparatus 
               101 : electric cable 
               103 : air-supply tube 
               110 : bezel fixing unit 
               111 : post member 
               131 : base member 
               133 : opening portion 
               151 : bezel guide member 
               153 : first penetration hole 
               155 : second penetration hole 
               171 : union joint 
               173 : connection hole 
               210 : clamping unit 
               211 : base plate 
               213 : mounting plate 
               231 : first driving cylinder 
               233 ,  265 : operation rod 
               241 : movable block 
               243 : tooling pin 
               245 : movable bracket 
               251 : fixed block 
               253 : clamp hole 
               261 : second driving cylinder 
               263 : fixing bracket 
               271 : stopping block 
               311 : floating body 
               331 : first floating member 
               333 : rail block 
               351 : second floating member 
               353 : mounting block 
               355 : cushion cylinder 
               411 : centering block 
               511 : supporting block 
               611 : vehicle body clamper 
               613 : rotation cylinder 
               614 : rotation rod 
               615 : clamping block 
           
         
       
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The present disclosure is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure are shown. As those having ordinary skill in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present disclosure. 
     The drawings and description are to be regarded as illustrative in nature and not restrictive, and like reference numerals designate like elements throughout the specification. 
     The size and thickness of each element are arbitrarily shown in the drawings, but the present disclosure is not necessarily limited thereto, and in the drawings, the thickness of layers, films, panels, regions, and the like, are exaggerated for clarity. 
     In the following description, dividing names of components into first, second and the like is to divide the names because the names of the components are the same as each other and an order thereof is not particularly limited. 
     Throughout this specification and the claims which follow, unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising” are understood to imply the inclusion of stated elements but not the exclusion of any other elements. 
     Further, the terms “ . . . unit”, “ . . . mechanism”, “ . . . portion”, “ . . . member”, and the like used herein mean a unit of inclusive components performing at least one or more functions or operations. 
       FIG. 1  schematically shows a door hinge mounting structure of a vehicle body according to an embodiment. 
     Referring to  FIG. 1 , an embodiment of the present disclosure may be applied to a door mounting process of mounting a front door and a rear door on a vehicle body  1  in a vehicle assembly factory. 
     For example, an embodiment may be applied to a process of pre-mounting door hinges  3  on upper and lower sides of front and rear pillars  2  of both side assemblies in the vehicle body  1 , respectively. 
     In this example, the front and rear pillars  2  of the vehicle body  1  form door hinge mounting portions  4  for mounting the upper and lower door hinges  3  on the upper and lower sides, respectively. 
     The door hinges  3  may be divided into an upper hinge mounted to an upper door hinge mounting portion  4  and a lower hinge mounted to a lower door hinge mounting portion  4 , regarding the front and rear pillars  2 . 
     The upper hinge of the door hinge  3  may be mounted on an upper part of the front and rear pillars  2 , and an upper part of front and rear doors. The lower hinge of the door hinge  3  may be mounted on a lower part of the front and rear pillars  2 , and a lower part of front and rear doors. 
     The door hinge  3  includes a hinge bracket  5  mounted on the upper and lower door hinge mounting portions  4 , a door bracket  6  mounted on a door (not shown), and a hinge pin  7  that engages the hinge bracket  5  and the door bracket  6 . 
     A first fastening hole  5   a  for fastening a bolt is formed in the hinge bracket  5 , and a second fastening hole  6   a  for fastening a bolt is formed in the door bracket  6 . The second fastening hole  6   a  may be provided as a tooling hole  6   b  for setting a reference position of the door hinge  3 . 
     Furthermore, bolt holes  8  for bolting the hinge bracket  5  of the door hinge  3  are formed in the upper and lower door hinge mounting portions  4 . 
     Furthermore, a center hole  9  is formed between the upper and lower door hinge mounting portions  4  in the pillar  2  to hold a reference point of the present apparatus with respect to the vehicle body  1 . 
     Referring to a structure of vehicle body  1  and an arrangement of door hinge  3  described with reference to  FIG. 1 , a system for mounting a door hinge of a vehicle according to an embodiment is hereinafter described in detail. 
       FIG. 2  is a perspective view of a system for mounting a door hinge of a vehicle according to an embodiment. 
     Referring to  FIG. 2 , a system for mounting a door hinge of a vehicle according to an embodiment  100  is for mounting a door hinge  3  to a vehicle body  1  that is transferred along a vehicle transfer line (not shown in the drawings) while being loaded on a carriage (or a pallet) (not shown in the drawings). 
     In other words, the door hinge mounting apparatus  100  may automatically mount the door hinges  3  to the upper and lower door hinge mounting portions  4  of the front and rear pillars  2 , at both sides of the vehicle body  1  transferred to a predetermined position along the vehicle transfer line. 
     According to an embodiment, a transfer direction of a carriage (or a pallet) may be defined as a vehicle body transfer direction. The vehicle body transfer direction (vehicle length direction) is typically called a T direction, a vehicle width direction is called an L direction, and a vehicle height direction is called an H direction. 
     In the description of an embodiment, a vehicle length direction, a vehicle width direction, and a vehicle height direction may also be used as reference directions instead of the LTH directions. 
     In addition, hereinafter, an “end (one end or the other end)” may be defined as any one end or may be defined as a predetermined portion (one end portion or the other end portion) including the end. 
     An embodiment provides a system  100  for mounting a door hinge of a vehicle that may reduce weight and volume of an entire apparatus and may improve the worker&#39;s working degree of freedom. 
     Furthermore, a system for mounting a door hinge of a vehicle according to an embodiment  100  may be used to actively cope with mixed production of multiple types of vehicles, may absorb an assembly deviation of the vehicle body  1 , and may precisely perform a jig adjustment according to the vehicle types or assembly deviation of the vehicle body  1 . 
     For such a purpose, a system for mounting a door hinge of a vehicle according to an embodiment  100  includes a jig frame  30 , a rotation index  50 , a vertical rotation shaft  70 , a bezel fixing unit  110 , and a clamping unit  210 . 
     Constituent elements described above and below may be formed on a base frame  10  disposed on both sides of the vehicle transfer line, both sides being outside the vehicle transfer line. The base frame  10  may be formed in a single frame or may be formed as a combination of component frames. 
     The base frame  10  is intended to support constituent elements, and includes accessory elements such as various brackets, blocks, plates, housings, covers, and collars. 
     The above accessory elements are for installing constituent elements to the base frame  10 , and therefore, the aforementioned accessory elements are also collectively referred to as the base frame  10 , except for exceptional cases. 
     In an embodiment, the jig frame  30  is installed to reciprocate in the vehicle width direction on the base frame  10  through the driving unit  31 . The jig frame  30  is slidably coupled to a pair of guide rails  33  installed on the base frame  10  along the vehicle width direction. 
     The driving unit  31  includes a main driving cylinder  35 , e.g., as a pneumatic cylinder. The main driving cylinder  35  is fixed to the base frame  10  and connected to the jig frame  30 . 
     Alternatively, the driving unit  31  may include a servomotor. In addition, the driving unit  31  may include a handling robot that can be selectively combined with the jig frame  30 . 
     Furthermore, the jig frame  30  is not necessarily limited to being installed on the base frame  10  to reciprocate in the vehicle width direction and may be mounted directly to an end of an arm of the handling robot. 
       FIG. 3  and  FIG. 4  illustrate a rotation index applied to a system for mounting a door hinge of a vehicle according to an embodiment. 
     Referring to  FIG. 3  and  FIG. 4 , in an embodiment, the rotation index  50  is rotatably installed on the jig frame  30 , by a predetermined rotation angle (e.g., 90 degrees) by a servomotor  51 . 
     The servomotor  51  may be provided as a motor capable of servo-control in a rotation speed and a rotating direction and may be fixedly installed on the jig frame  30 . 
     The rotation index  50  rotates around the rotation center axis S on the jig frame  30  and is coupled to a hollow driveshaft  53  connected to the servomotor.  51 . The hollow driveshaft  53  forms a rotation center axis S (refer to  FIG. 4 ) of the rotation index  50 . 
     In an embodiment, as shown in  FIG. 3  and  FIG. 4 , the vertical rotation shaft  70  is coaxially connected to the rotation index  50  through the rotation center axis S of the rotation index  50 . 
     The vertical rotation shaft  70  includes a hollow polyhedron  71  and is coaxially connected to the rotation center axis S of rotation index  50  along the up and down vertical directions. In other words, hollow centers of the driveshaft  53  and the vertical rotation shaft  70  as described above are coaxially connected to each other along the up and down directions. 
     For example, the vertical rotation shaft  70  is provided as the polyhedron  71  having four surfaces. However, the vertical rotation shaft  70  is not limited thereto and may be provided as a polyhedron having more than four surfaces. A bottom end of the vertical rotation shaft  70  may be bolt-engaged with the rotation index  50 . 
     Referring to  FIG. 2 , in an embodiment, the bezel fixing unit  110  is configured to interiorly fix an electric cable  101  (refer to  FIG. 7 ) and an air-supply tube  103  (refer to  FIG. 7 ) for distributing electric power and air required for operation of the entire apparatus. 
       FIGS. 5-7  respectively illustrate a bezel fixing unit applied to a system for mounting a door hinge of a vehicle according to an embodiment. 
     Referring to  FIGS. 5-7 , the bezel fixing unit  110  penetrates cavities of the driveshaft  53  and the hollow vertical rotation shaft  70  described above and is fixedly installed to the jig frame  30 . 
     The bezel fixing unit  110  includes a post member  111 , a base member  131 , a bezel guide member  151 , and a union joint  171 , that are respectively of a cylindrical shape. 
     The post member  111  is fixedly installed to the jig frame  30  through the cavity of the hollow vertical rotation shaft  70  of the driveshaft  53 . A bottom end portion of the post member  111  penetrates the cavity of the hollow vertical rotation shaft  70  of the driveshaft  53  and is fixed to the jig frame  30 . 
     The base member  131  has an opening portion  133  having a predetermined open portion. The base member  131  is provided at a bottom end of the post member  111  and is fixed to the jig frame  30 . 
     The bezel guide member  151  has a plurality of penetration holes  153  and  155  through which the electric cable  101  and the air-supply tube  103  are inserted, respectively, through the interior of the post member  111 . The bezel guide member  151  is connected to a top end of the post member  111 . 
     The penetration holes  153  and  155  include a first penetration hole  153  and a second penetration hole  155 . The electric cable  101  is inserted through the first penetration hole  153  through the opening portion  133  of the base member  131  and the interior of the post member  111 . The air-supply tube  103  inserted through the second penetration hole  155  through the opening portion  133  of the base member  131  and the interior of the post member  111 . 
     The first penetration hole  153  is formed to penetrate the bezel guide member  151  in the up and down directions. Separately from the first penetration hole  153 , the second penetration hole  155  is formed along the up and down direction of the bezel guide member  151  to penetrate exterior circumference surfaces of the bezel guide member  151 . 
     The union joint  171  is a joint connecting the post member  111  and the bezel guide member  151  and may be provided as a union nut of a cylindrical shape. The union joint  171  forms a connection hole  173  connected to the second penetration hole  155  of the bezel guide member  151 . 
     Referring to  FIG. 2 , in an embodiment, the clamping unit  210  is configured to clamp the door hinge  3  and is installed on a base plate  211  fixed to each side of the vertical rotation shaft  70 . 
     Such a clamping unit  210  is installed on each side of the vertical rotation shaft  70  to clamp different door hinges  3  for different vehicle types. In other words, since the vertical rotation shaft  70  is provided as the polyhedron  71  having four surfaces as described above, the clamping unit  210  installed on each side may clamp the door hinge  3  corresponding to four vehicle types. 
       FIGS. 8-11  respectively illustrate a clamping unit applied to a system for mounting a door hinge of a vehicle according to an embodiment. 
     Referring to  FIGS. 8-11 , the clamping unit  210  according to an embodiment is installed via a mounting plate  213  on the base plate  211  as mentioned above and is disposed on the mounting plate  213  in the up and down directions respectively. 
     In this example, the clamping unit  210  is configured on the upper and lower sides of the mounting plate  213 , respectively. In this case, an upper clamping unit  210  clamps an upper hinge of the door hinges  3 , and a lower clamping unit  210  clamps a lower hinge of the door hinges  3 . 
     Each clamping unit  210  includes a first driving cylinder  231 , a movable block  241 , a fixed block  251 , a second driving cylinder  261 , and a stopping block  271 . 
     The first driving cylinder  231  is a pneumatic cylinder that is fixedly installed to the mounting plate  213 . The movable block  241  has a pair of tooling pins  243 , which are fitted into a tooling hole  6   b  of the door hinge  3  and is connected to an operation rod  233  of the first driving cylinder  231  via a movable bracket  245 . The movable block  241  may move in the vehicle length direction of the vehicle body through the movable bracket  245  by forward and backward operations of the first driving cylinder  231 . 
     The fixed block  251  has a clamp hole  253  into which the tooling pin  243  is fitted after penetrating the tooling hole  6   b  of the door hinge  3  and is fixedly installed to the mounting plate  213 . 
     The fixed block  251  does not interfere with the movable bracket  245  and the movable block  241  moving in the forward and rearward directions by the first driving cylinder  231 . The fixed lock  251  is fixedly installed to the mounting plate  213  between the first driving cylinder  231  and the movable block  241 . 
     In this example, the movable block  241  is moved backward by the backward operation of the first driving cylinder  231  and may clamp the door hinge  3  through the fixed block  251 . 
     In an embodiment, with the movable block  241  having moved forward with the forward movement of the first driving cylinder  231 , the tooling pin  243  may be inserted into the tooling hole  6   b  of the door hinge  3  and may set the door hinge  3  in the movable block  241 . 
     In an embodiment, while the door hinge  3  is set to the movable block  241 , the movable block  241  may be moved backward by the backward operation of the first driving cylinder  231 , and the tooling pin  243  may be inserted into the clamp hole  253  of the fixed block  251 , thereby to clamp the door hinge  3  through the movable block  241  and the fixed block  251 . 
     The second driving cylinder  261  is a pneumatic cylinder and is fixedly installed to the mounting plate  213  via a fixing bracket  263 . The stopping block  271  supports the door hinge  3  clamped between the movable block  241  and the fixed block  251 . In other words, the stopping block  271  is provided as a positioning block that prevents a movement of the door hinge  3  clamped between the movable block  241  and the fixed block  251 . 
     The stopping block  271  is connected to an operation rod  265  of the second driving cylinder  261 . The stopping block  271  may be reciprocated in the vehicle width direction by forward and backward operation of the second driving cylinder  261 . 
       FIG. 12  illustrates a floating structure applied to a system for mounting a door hinge of a vehicle according to an embodiment. 
     Referring to  FIG. 12 , an embodiment further includes a floating structure for finely adjusting the position of the clamping unit  210  through the mounting plate  213  according to the position of the vehicle body  1  and an assembly deviation. 
     In an embodiment, the floating structure includes a floating body  311 , a first floating member  331 , and a second floating member  351 . 
     The floating body  311  corresponds to the mounting plate  213 , and is coupled to the base plate  211 , slidably in the up and down directions. The floating body  311  is slidably coupled to a guide rail  215  provided in the up and down directions on the base plate  211 . 
     The first floating member  331  supports the forward and rearward movement of the mounting plate  213  along the vehicle length direction of the vehicle body  1 . The first floating member  331  is connected to the mounting plate  213  and slidably coupled to the floating body  311  along the vehicle length direction of the vehicle body  1 . 
     This first floating member  331  includes a plurality of rail blocks  333  that are fixedly mounted to the mounting plate  213 . Each rail block  333  of the plurality of rail blocks  333  is coupled to a guide rail  313  slidably along the vehicle length direction of the vehicle body  1 , the guide rail  313  being provided to the floating body  311  along the vehicle length direction of the vehicle body  1 . 
     The second floating member  351  supports an up and down movement of the floating body  311  connected to the mounting plate  213  via first floating member  331 . The second floating member  351  is installed at the base plate  211 , correspondingly to a bottom end of the floating body  311 . 
     The second floating member  351  includes a mounting block  353  and a plurality of cushion cylinders  355 . The mounting block  353  is fixedly installed to the base plate  211  along the vehicle length direction of the vehicle body  1 . The plurality of cushion cylinders  355  are installed to the mounting block  353  with a predetermined spacing. 
     A cushion cylinder  355  is a cushion unit elastically supporting the bottom end of the floating body  311  and is structured such that a portion supporting the bottom end of the floating body  311  may move in the up and down direction through a spring (not shown in the drawings) inside the cylinder. 
       FIG. 13  illustrates a part of a system for mounting a door hinge of a vehicle according to an embodiment. 
     Referring to  FIG. 13 , an embodiment further includes a centering block  411 , a supporting block  511 , and a vehicle body clamper  611 , for supporting and clamping the vehicle body  1  while holding a reference position of the mounting plate  213  relative to the vehicle body  1 . 
     In an embodiment, the centering block  411  holds the reference point of the mounting plate  213  relative to the vehicle body  1  and is fixedly installed to the mounting plate  213 . The centering block  411  may be fitted into the center hole  9  of the vehicle body  1 . 
     The centering block  411  is provided in a shape in which a cross-section gradually increases as the centering block  411  moves away from the vehicle body  1 . In other words, the centering block  411  forms a taper at an end. 
     In an embodiment, if an assembly deviation of the vehicle body  1  or a positional deviation occurs, the centering block  411  fits into the center hole  9  of the vehicle body  1 , and the position of the clamping unit  210  provided at the mounting plate  213  may be finely adjusted through the first and second floating members  331  and  351  (refer to  FIG. 12 ). 
     In an embodiment, the supporting block  511  supports an outer panel of the vehicle body  1  and is fixedly installed to mounting plate  213 . For example, the supporting block  511  is provided in a shape of a rectangular block of rubber material. 
     In addition, in an embodiment, the vehicle body clamper  611  is configured to clamp vehicle body  1  and is rotatably installed on the mounting plate  213 . The vehicle body clamper  611  includes a rotation cylinder  613  and a clamping block  615 . 
     The rotation cylinder  613  is fixedly installed to the mounting plate  213  and is disposed in the vehicle width direction on the mounting plate  213 . The rotation cylinder  613  has a rotation rod  614  that rotates by a pneumatic pressure. 
     The clamping block  615  clamps the interior side of the vehicle body  1  and is connected to the rotation rod  614  of the rotation cylinder  613 . The clamping block  615  may clamp the interior side of the vehicle body  1  by entering the interior side of the vehicle body  1  and rotating by a rotational operation of the rotation rod  614  by the rotation cylinder  613 . 
     The rotation rod  614  may be reciprocated in the vehicle width direction through a lead screw coupling structure known in the art which rotates by a pneumatic pressure and converts a rotational motion into a linear reciprocal motion. 
     Hereinafter, an operation of a system for mounting a door hinge of a vehicle according to an embodiment  100  is described in detail with reference to the drawings. 
     First, in an embodiment, the vehicle body  1  is transferred to a predetermined position along the vehicle transfer line. In this process, the jig frame  30  is moved backward in the vehicle width direction away from the vehicle body  1  along the guide rail  33  on the base frame  10  by the backward operation of the main driving cylinder  35  on both sides of the vehicle transfer line. 
     In an embodiment, the electric cable  101  and the air-supply tube  103  are located inside the cavity of the vertical rotation shaft  70  through the bezel fixing unit  110 . 
     In this example, the electric cable  101  is held in the first penetration hole  153  of the bezel guide member  151  through the opening portion  133  of the base member  131  and the interior of the post member  111 . The air-supply tube  103  is held in the second penetration hole  155  of the bezel guide member  151  through the opening portion  133  of the base member  131  and the interior of the post member  111 . 
     Furthermore, the vertical rotation shaft  70  is connected to the rotation center axis S of the rotation index  50  coaxially in the up and down direction, through the driveshaft  53  connected to the servomotor  51 . 
     In this case, the vertical rotation shaft  70  is rotated at a predetermined angle through the rotation index  50 , correspondingly to the type of vehicle of the vehicle body  1 . In an embodiment, the torque of the driveshaft  53  driven by the servomotor  51  is transmitted to the rotation index  50 , and the vertical rotation shaft  70  connected to the rotation index  50  may be rotated by a predetermined angle (90 degree unit). 
     In this example, one side of the vertical rotation shaft  70  faces the assembly side of the vehicle body  1 , and the clamping unit  210  for clamping the door hinge  3  according to the vehicle type of the vehicle body  1  faces the assembly side of the vehicle body  1 , at both the upper and lower sides of the vertical rotation shaft  70 . 
     Furthermore, in an embodiment, the movable block  241  of the clamping unit  210  is moved forward in a direction away from the fixed block  251  by the forward operation of the first driving cylinder  231 . In addition, the stopping block  271  of the clamping unit  210  is moved backward by the backward operation of the second driving cylinder  261 . 
     In this state, in an embodiment, the door hinge  3  is set to the movable block  241 , in which the door hinge  3  is set to the movable block  241  while inserting the tooling hole  6   b  of the door hinge  3  into the tooling pin  243  of the movable block  241 . 
     Then, in an embodiment, by the backward operation of the first driving cylinder  231 , the movable block  241  is moved backward in a direction approaching the fixed block  251 . 
     Thus, in an embodiment, the tooling pin  243  is inserted into the clamp hole  253  of the fixed block  251 , and the door hinge  3  is clamped through the movable block  241  and the fixed block  251 . 
     Subsequently, in an embodiment, the stopping block  271  is moved forward by the forward operation of the second driving cylinder  261 . Then, the stopping block  271  supports the door hinge  3  clamped between the movable block  241  and the fixed block  251  and prevents a movement of the door hinge  3 . 
     Subsequently, in an embodiment, by the forward operation of the main driving cylinder  35 , the jig frame  30  is moved forward along the guide rail  33  in the vehicle width direction approaching the vehicle body  1 . 
     Then, in an embodiment, the support block  511  supports the front and rear pillars  2  of the vehicle body  1  and, simultaneously, the centering block  411  is coupled to the center hole  9  of the vehicle body  1 , thereby setting the reference position of the clamping unit  210  with respect to the vehicle body  1 . At this time, the clamping block  615  is located inside the vehicle body  1  without interfering with the front and rear pillars  2  of the vehicle body  1 . 
     In the case of an assembly deviation of the vehicle body  1  or a positional deviation, in an embodiment, when the centering block  411  fits into the center hole  9  of the vehicle body  1 , the position of the mounting plate  213  supporting the clamping unit  210  may be finely adjusted to a predetermined position through the first and second floating members  331  and  351 . 
     In this case, in an embodiment, the mounting plate  213  may slide in the floating body  311  along the forward and rearward direction through the rail block  333  of the first floating member  331 , and the position of the mounting plate  213  may be finely adjusted to a predetermined position. 
     In addition, in an embodiment, the floating body  311  supporting the mounting plate  213  may slide along the up and down direction by the cushion cylinder  355  of the second floating member  351 , and the position of the mounting plate  213  may be finely adjusted to a predetermined position. 
     In the state as described above, in an embodiment, the clamping block  615  is rotated by the rotation operation of the rotation rod  614  of the rotation cylinder  613 , and the interior side of the vehicle body  1  is clamped by the clamping block  615 . 
     Thus, in an embodiment, the door hinge  3  clamped to the clamping unit  210  may be correctly positioned in the upper and lower door hinge mounting portions  4  at the front and rear pillars  2  of the vehicle body  1 . 
     In an embodiment, the hinge bracket  5  of the door hinge  3  is brought into close contact with the upper and lower door hinge mounting portions  4 , and the first fastening hole  5   a  of the hinge bracket  5  coincides with the bolt hole  8  of the upper and lower door hinge mounting portions  4 . 
     Finally, in an embodiment, the door hinge  3  is bolted to the upper and lower door hinge mounting portions  4  by a bolting device, e.g., a bolt runner (not shown in the drawing). 
     According to an embodiment as described above, a clamping unit  210  for clamping different door hinges  3  for different types of vehicles may be configured on each side of the vertical rotation shaft  70 , and the vertical rotation shaft  70  may be rotated through the rotation index  50 . 
     Therefore, a system for mounting a door hinge of a vehicle according to embodiments may be used to actively cope with mixed production of multiple types of vehicles and may provide reduction of an equipment investment cost since it is not necessary to add equipment according to every vehicle type. 
     In addition, an embodiment may simplify the configuration of the clamping unit  210  that clamps the door hinge  3  and may reduce the weight and volume of the entire apparatus by coaxially connecting the vertical rotation shaft  70  and the rotation index  50  along the up and down directions. 
     Thus, in an embodiment, simultaneous mounting of the door hinge  3  to the upper and lower door hinge mounting portions  4  of the front and rear pillars  2  allows for reduced workforce and operating costs due to process reduction, thereby further improving the work efficiency and productivity. 
     Furthermore, in an embodiment, by reducing the number of parts of the entire apparatus, it is possible to minimize the failure factor of the equipment, thereby reducing the maintenance and repair work of the equipment, and further improving the utilization rate of the equipment. 
     Furthermore, in an embodiment, the electric cable  101  and the air-supply tube  103  are formed inside the vertical rotation shaft  70  through the bezel fixing unit  110 , thereby further improving the worker&#39;s working degree of freedom. 
     While this disclosure has been described in connection with what is presently considered to be practical embodiments, it is to be understood that the disclosure is not limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.