Inwardly swinging door structure for a vehicle

Abstract

The present invention relates to a swing-in door structure of a vehicle, including doors arranged in parallel on both sides of an entrance of the vehicle, and a door arm installed at one side of the door to open or close the door by rotation, the swing-in door structure further including a central door support having one end fixed to one surface of an upper center of the door and extending in a direction perpendicular to the door, a roller support having one end coupled to the other end of the central door support in a direction perpendicular to the central door support, and a roller installed at the other end of the roller support and coupled so as to roll and rotate in contact with a rail on a vehicle body at an upper side of the door.

Description

Technical Field

[0001] This invention relates to a swing-in door structure for a vehicle, and more particularly to a swing-in door structure for a vehicle that allows for easy adjustment of the step difference of the swing-in door. Background Technology

[0002] Typically, double-swing doors used in vehicles (such as low-floor buses) may require a wider entrance than ordinary folding doors because they open and close when rotated inwards at the vehicle entrance. Furthermore, compared to other types of doors, they offer advantages such as simple structure, durability, and low cost, making them widely used in city buses globally.

[0003] refer to Figure 1 and Figure 2 For vehicles with existing double inward-swinging doors, there are parallel doors 2 and 4 on both sides of the vehicle entrance, a door arm 6 installed on one side of door 2, and a closing device for opening and closing door 2 by rotating the door arm 6. A door arm and opening / closing device are also provided on the right side symmetrical to door 2.

[0004] In the inward-swinging door opening / closing device, door 2 is opened and closed by cylinder 8 controlled by an electric switch. In this case, the linear motion caused by the driving force of cylinder 8 is converted into the rotational motion of door arm 6 to open and close door 2. Link 10 is provided in cylinder 8 for linear motion. When link 10 moves linearly due to the driving force of cylinder 8, door arm 6 rotates to open or close door 2. In this case, guide arm 12 connected between door arm 6 and the upper end of door 2 is configured to slide from the upper end of door 2, thereby rotating door 2. In addition, roller 14 and bracket 16 are provided at the upper end of door 2, such that roller contacts the door vehicle body to rotate, so that as door 2 rotates, roller rotates along the door vehicle body, thus opening and closing the door.

[0005] However, during the assembly of the inward-swinging door opening and closing device, gaps may occur between the door-side body and the upper part of the door, and misalignment may also occur between doors 2 and 4. In addition, a complete seal along the width direction of the body may not be formed between doors 2 and 4 and the body of doors 2 and 4.

[0006] The aforementioned gaps are unsightly and may allow dust and outside air to flow into the vehicle, as well as generate noise such as wind noise, thus deteriorating the vehicle's quality.

[0007] The information disclosed in this background section is only intended to enhance the understanding of the background of this invention, and therefore may contain information that does not constitute prior art known to those skilled in the art in this country. Summary of the Invention

[0008] This invention aims to provide an inward-swinging door structure for vehicles, which can absorb assembly deviations of the vehicle and finely adjust the step difference of the door.

[0009] According to an embodiment of the present invention, an inward-swinging door structure for a vehicle is provided, comprising doors arranged parallel to each other on both sides of the vehicle entrance, and a door arm mounted on one side of the door to open or close the door by rotation. The inward-swinging door structure further comprises: a central door support, one end of which is fixed to a surface at the upper center of the door and extends in a direction perpendicular to the door; a roller support, one end of which is coupled to the other end of the central door support in a direction perpendicular to the central door support; and a roller, mounted on and coupled to the other end of the roller support, so as to roll and rotate when in contact with a track on the vehicle body above the door.

[0010] The roller bracket includes: a first roller bracket, which is attached to the central door bracket, and a second roller bracket, which extends integrally with the first roller bracket and is attached to the roller; and the radius of the first roller bracket is greater than the radius of the second roller bracket, wherein the two radii refer to the radii along the horizontal direction of the vehicle.

[0011] The central axis of the first roller support is eccentric relative to the central axis of the second roller support.

[0012] The central axis of the first roller support is spaced 4mm to 6mm apart from the central axis of the second roller support.

[0013] The vehicle's inward-swinging door structure also includes a central door bracket fixing bolt, wherein one end of the first roller bracket is fixed to the other end of the central door bracket by the central door bracket fixing bolt.

[0014] The vehicle's inward-swinging door structure also includes: an upper door bracket, one end of which is fixed to the upper surface of the door between the door arm and the central door bracket and extends in a direction perpendicular to the door; a pivot pin, mounted in a direction perpendicular to the upper door bracket to pass through the upper door bracket; and an upper guide arm, one end of which is rotatably coupled to one end of the pivot pin, while the other end is fixed to the door arm to extend horizontally to the door.

[0015] The vehicle's inward-swinging door structure also includes upper door bracket fixing bolts, wherein one end of the upper door bracket is fixed to the upper surface of the door by the upper door bracket fixing bolts.

[0016] The pin can pass through the upper part bracket opening in the upper part bracket, and the upper part bracket is fixedly installed on both sides of the upper part bracket opening by nuts.

[0017] One end of the upper guide arm has an upper guide arm opening for inserting a shaft pin; and the upper guide arm opening has a ball joint that rolls and rotates within the upper guide arm opening and is fixed to one end of the shaft pin.

[0018] One end of the pin has a locking protrusion so that the pin can be locked to the inlet side of the upper guide arm opening into which the pin is inserted.

[0019] The vehicle's inward-swinging door structure also includes a pivot pin fixing bolt, wherein one end of the pivot pin and one end of the upper guide arm are connected by the pivot pin fixing bolt.

[0020] The vehicle's inward-swinging door structure also includes: a lower door support, one end of which is fixed to the lower side of the door-side body, and the other end of which is attached to the lower end of the door arm; and a lower guide arm, one end of which is rotatably attached to the lower end of the door arm, and the other end of which is fixed to the lower surface of the door.

[0021] The vehicle's inward-swinging door structure also includes a lower door support fixing bolt, wherein: one end of the lower door support has an upper long hole; and the lower door support fixing bolt is inserted into the upper long hole, so that the lower door support is fixed to the lower side of the door side body.

[0022] One end of the lower guide arm is inserted and connected between the other end of the lower door bracket and the lower end of the door arm; the other end of the lower door bracket has a lower long hole; and the lower guide arm fixing bolt passes through and is inserted into the lower long hole, so that the lower door bracket and the lower guide arm are fixed to the lower end of the door arm by bolts.

[0023] The vehicle's inward-swinging door structure also includes a retaining pin, wherein: the retaining pin passes through and engages with the other end of the lower guide arm; and the retaining pin is rotatably inserted into a retaining pin insertion member located on the lower surface of the door.

[0024] According to an embodiment of the present invention, in the inward-swinging door structure of a vehicle, by finely adjusting the step difference of the door to minimize the gap around the door, dust and other contaminants can be prevented from entering the vehicle, and wind noise can be minimized.

[0025] In addition, the step difference between the direction perpendicular to the door and the vehicle width direction can be easily adjusted by adjusting the bolts or nuts, thereby achieving a waterproof structure. Attached Figure Description

[0026] Figure 1 The diagram shows an inward-swinging door structure applied to existing vehicles, as viewed from the inside of the vehicle.

[0027] Figure 2 A top view and running trajectory of an inward-swinging door structure applied to an existing vehicle are shown;

[0028] Figure 3 The central portion of an inward-swinging door structure of a vehicle according to an embodiment of the present invention is shown;

[0029] Figure 4 The diagram illustrates the connection state between the central door support and the roller support of an inward-swinging door structure of a vehicle according to an embodiment of the present invention.

[0030] Figure 5A and Figure 5B The diagram illustrates the operational state along the central portion of the inward-swinging door structure of a vehicle according to an embodiment of the present invention. Figure 3 A cross-sectional view taken from line AA in the diagram;

[0031] Figure 6 The upper part of an inward-swinging door structure of a vehicle according to an embodiment of the present invention is shown;

[0032] Figure 7 The diagram illustrates the connection state between the upper door support and the upper guide arm of an inward-swinging door structure of a vehicle according to an embodiment of the present invention.

[0033] Figure 8 The diagram shows a cross-sectional view of the upper part of an inward-swinging door structure of a vehicle according to an embodiment of the present invention, viewed from the side.

[0034] Figure 9 A cross-sectional view of the upper part of an inward-swinging door structure of a vehicle according to an embodiment of the present invention, as viewed from the inside of the vehicle, is shown.

[0035] Figure 10 The lower portion of an inward-swinging door structure of a vehicle according to an embodiment of the present invention is shown; and

[0036] Figure 11 The diagram illustrates the connection between the lower door support and the lower guide arm of an inward-swinging door structure of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0037] The invention will now be described more fully with reference to the accompanying drawings, in which embodiments of the invention are illustrated. As will be appreciated by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of the invention.

[0038] Furthermore, in the embodiments of the present invention, the same reference numerals are used to denote the same constituent elements, and the components in the first embodiment are described in detail with reference to the corresponding drawings, while in other embodiments, only the components different from those in the first embodiment are described.

[0039] The accompanying drawings are schematic and not shown to specific dimensions. For clarity and convenience, the dimensions and proportions of parts are exaggerated or reduced in the drawings, and these dimensions are merely illustrative and not limiting. Furthermore, in structures, elements, or assemblies shown in two or more drawings, the same reference numerals are used to indicate the same or similar features. It should be understood that when an element such as a layer, film, region, area, or substrate is referred to as "on" another element, it may be directly on the other element or may exist as a component in between.

[0040] In this invention, terms such as "down" or "up," "vertical" or "horizontal," etc., can be used to describe features of the embodiments with reference to the position of features shown in the figures.

[0041] The embodiments of the present invention include exemplary embodiments of the invention described in detail. Therefore, various modifications to the drawings are contemplated. Thus, the embodiments are not limited to a specific shape of the illustrated region, but rather include, for example, variations in shape depending on manufacturing.

[0042] In the following, the inward-swinging door structure of a vehicle according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0043] Figure 3 The central portion of an inward-swinging door structure of a vehicle according to an embodiment of the present invention is shown.

[0044] refer to Figure 3 According to an embodiment of the present invention, the inward-swinging door structure of a vehicle includes: doors 2 arranged parallel to each other on both sides of the vehicle entrance, and a door arm 6 installed on one side of the door 2 to allow the door to be opened and closed by rotation. The door structure also includes a central door support 20, a roller support 30, and a roller 40.

[0045] The central door bracket 20 has a curved plate shape, one end of which is attached and fixed to one side of the upper center of the door 2, and extends in a direction perpendicular to the door 2. That is, one end of the central door bracket 20 is fixed to the door 2 on the inside of the vehicle and extends toward the inside of the vehicle.

[0046] The other end of the central door bracket 20, which extends toward the interior of the vehicle, is joined to one end of the roller bracket 30 in a direction perpendicular to the central door bracket 20. The roller bracket 30 extends toward the upper part of the vehicle in a direction parallel to the door 2.

[0047] Roller 40 is mounted at the other end of roller bracket 30 and can be coupled to roller bracket 30 to roll and rotate when in contact with track 3 formed on the upper side of the vehicle body of door 2. When door 2 is opened or closed, central door bracket 20 attached and fixed to door 2 moves with door 2, and roller bracket 30 and roller 40 coupled to central door bracket 20 are moved. In this case, roller 40 can roll and rotate when in contact with track 3 formed on the upper side of the vehicle body of door 2.

[0048] Figure 4 The diagram illustrates the connection state between the central door support and the roller support of an inward-swinging door structure of a vehicle according to an embodiment of the present invention. Figure 5A and Figure 5B The diagram illustrates the operational state along the central portion of the inward-swinging door structure of a vehicle according to an embodiment of the present invention. Figure 3 The cross-sectional view taken by line AA in the diagram.

[0049] refer to Figure 4 The roller support 30 includes a first roller support 32 and a second roller support 34. The first roller support 32 is connected to the other end of the central gate support 20 by a central gate support fixing bolt 25, while the second roller support 34 extends integrally with the first roller support 32 and is connected to the roller 40. The roller 40 is rotatably connected to the outer peripheral surface of the second roller support 34.

[0050] The first roller support 32 and the second roller support 34 can be formed to have a generally cylindrical shape, and the radius of the first roller support 32 along the horizontal direction of the vehicle can be greater than the radius of the second roller support 34.

[0051] Additionally, see Figure 5A and 5B The central axis C1 of the first roller support 32 and the central axis C2 of the second roller support 34 can be eccentric. The central axis C1 of the first roller support 32 can be on the same straight line as the axis that fixes the first roller support 32 at the other end of the central gate support 20 by the central gate support fixing bolt 25. The central axis C2 of the second roller support 34 can be positioned at a predetermined distance from the central axis C1 of the first roller support 32. The central axis C1 of the first roller support 32 and the central axis C2 of the second roller support 34 can be eccentric so that they are spaced apart from each other by a distance of about 4 mm to about 6 mm.

[0052] Because the central axis C1 of the first roller bracket 32 ​​is eccentric to the central axis C2 of the second roller bracket 34, when the central axis C1 of the first roller bracket 32 ​​is positioned to retract towards the inside (inside) of the vehicle relative to the central axis C2 of the second roller bracket 34, as... Figure 5AAs shown, the vehicle door 2 can be positioned closer to the inside of the vehicle. Additionally, when the central axis C1 of the first roller support 32 is positioned retracted towards the outside (outside) of the vehicle compared to the central axis C2 of the second roller support 34, as... Figure 5B As shown, the vehicle's door 2 can be positioned closer to the outside of the vehicle.

[0053] The first roller bracket 32 ​​can be connected to the other end of the central door bracket 20 via the central door bracket fixing bolt 25. Since the central door bracket fixing bolt 25 can be loosened to rotate the roller bracket 30 and then tightened again to fix the roller bracket 30, the position of the door 2 in the vehicle width direction can be adjusted by adjusting the amount of rotation of the roller bracket 30.

[0054] Figure 6 The upper part of the inward-swinging door structure of a vehicle according to an embodiment of the present invention is shown.

[0055] refer to Figure 6 According to an embodiment of the present invention, the inward-swinging door structure of a vehicle may further include an upper door support 50, a pivot pin 60, and an upper guide arm 70.

[0056] The upper door bracket 50 is fixed to the upper surface of the door 2 between the door arm 6 and the central door bracket 20, and may have a plate-like shape extending toward the inside of the vehicle in a direction perpendicular to the door 2. A pivot pin 60 is mounted in a direction perpendicular to the upper door bracket 50 so as to pass through the upper door bracket 50.

[0057] Additionally, one end of the upper guide arm 70 is rotatably coupled to the pivot pin 60, and the other end can be fixed to the door arm 6, so that the upper guide arm 70 extends horizontally to the door 2.

[0058] A pivot pin 60 is inserted into an upper guide arm opening 72 formed at one end of the upper guide arm 70, allowing one end of the upper guide arm 70 to rotate around the pivot pin 60. Furthermore, by rotating the door arm 6, the other end of the upper guide arm 70 can rotate together with the door arm 6 in the horizontal direction to the door 2.

[0059] Figure 7 The diagram illustrates the connection state of the upper door bracket and the upper guide arm of the inward-swinging door structure of a vehicle according to an embodiment of the present invention.

[0060] Reference Figure 7 One end of the upper door bracket 50 can be fixed to the upper surface of the door 2 by the upper door bracket fixing bolt 52. In addition, the axle pin 60 can pass through the upper door bracket opening 66 formed in the upper door bracket 50, and can be tightened on both sides of the upper door bracket opening 66 by nuts 62 to fix it on the upper door bracket 50.

[0061] An upper guide arm opening 72 for inserting the pivot pin 60 is formed at one end of the upper guide arm 70. The upper guide arm opening 72 may be provided with a ball joint 74, which rolls and rotates within the upper guide arm opening 72 while being fixed to one end of the pivot pin 60. Furthermore, one end of the pivot pin 60 and one end of the upper guide arm 70 can be joined by a pivot pin fixing bolt 76 passing through the upper guide arm opening 72.

[0062] On the other hand, a locking protrusion 64 may be formed at one end of the pin 60. When the upper guide arm 70 is engaged with one end of the pin 60, the locking protrusion 64 is used to lock the pin 60 to the inlet side of the upper guide arm opening 72. In addition, when the upper guide arm 70 rotates, it can prevent the upper guide arm 70 from separating towards the lower part of the pin 60.

[0063] Additionally, the ring 78 can be located between the ball joint 74 and the locking protrusion 64 to reduce the friction between the ball joint 74 and the locking protrusion 64, allowing the ball joint 74 to rotate smoothly.

[0064] Figure 8 This is a cross-sectional view of the upper part of the inward-swinging door structure of a vehicle according to an embodiment of the present invention, viewed from the side. Figure 9 This is a cross-sectional view of the upper part of the inward-swinging door structure of a vehicle according to an embodiment of the present invention, viewed from the inside of the vehicle.

[0065] refer to Figure 8 and Figure 9 One end of the upper door bracket 50 is fixed to the upper surface of the door 2 by the upper door bracket fixing bolt 52, and the axle pin 60 can be installed through the upper door bracket opening 66. In addition, the ball joint 74 is engaged with the periphery of the other end of the axle pin 60, and the ball joint 74 can be inserted into the upper guide arm opening 72 so that the ball joint 74 can rotate within the upper guide arm opening 72 as the upper guide arm 70 rotates.

[0066] The pivot pin 60 can be tightened on both sides of the upper door bracket opening 66 by nuts 62. When the nuts 62 are loosened and the pivot pin 60 is rotated, the upper door bracket 50 can move vertically, and as the upper door bracket 50 moves, the door 2 fixed to the upper door bracket 50 can also move vertically. Therefore, the position of the door 2 in the vertical direction of the vehicle can be adjusted by adjusting the degree to which the pivot pin 60 is inserted into the upper door bracket 50.

[0067] Figure 10 The lower part of the inward-swinging door structure of a vehicle according to an embodiment of the present invention is shown. Figure 11 The diagram illustrates the connection state of the lower door support and the lower guide arm of an inward-swinging door structure of a vehicle according to an embodiment of the present invention.

[0068] refer to Figure 10 and Figure 11 According to an embodiment of the present invention, the inward-swinging door structure of a vehicle may further include a lower door support 80 and a lower guide arm 90. One end of the lower door support 80 is fixed to the lower side of the vehicle body on the door 2 side, while the other end is coupled to the lower end of the door arm 6. One end of the lower door support 80 may be plate-shaped and may be fixed to the surface of the vehicle body on the door 2 side by a lower door support fixing bolt 88. In addition, the other end of the lower door support 80 may be bent from one end of the lower door support 80 to be coupled to the lower end of the door arm 6.

[0069] One end of the lower guide arm 90 is pivotally connected to the lower end of the door arm 6 around the axis of the door arm 6, and the other end is fixed to the lower surface of the door 2. One end of the lower guide arm 90 can be rotatably connected between the other end of the lower door bracket 80 and the lower end of the door arm 6. In addition, the other end of the lower guide arm 90 is provided with a fixing pin 92, and the fixing pin 92 is rotatably inserted into a fixing pin insertion member 94 provided on the lower surface of the door 2.

[0070] On the other hand, an upper long hole 86 is formed at one end of the lower door bracket 80, and a lower door bracket fixing bolt 88 is inserted into the upper long hole 86, so that one end of the lower door bracket 80 can be bolted to and fixed to the lower side of the vehicle body on the side of the door 2. Multiple upper long holes 86 can be provided. When the lower door bracket fixing bolt 88 provided in the upper long hole 86 is loosened to move the lower door bracket 80 vertically and when the lower door bracket fixing bolt 88 is tightened again to fix the lower door bracket 80, the vertical height of the door arm 6 can be adjusted. Therefore, the vertical height of the vehicle connected to the lower guide arm 90 of the door arm 6 and the vertical height of the vehicle connected to the other end of the lower guide arm 90 can be adjusted.

[0071] On the other hand, a lower elongated hole 82 is formed at the other end of the lower door bracket 80, and a lower guide arm fixing bolt 84 is inserted into the lower elongated hole 82, so that the lower door bracket 80 and the lower guide arm 90 can be bolted to the lower end 6 of the door arm. When the lower guide arm fixing bolt 84 provided in the lower elongated hole 82 is loosened to move the door arm 6 in the vehicle width direction, and when the lower guide arm fixing bolt 84 is tightened again to fix the door arm 6, the distance of the door arm 6 in the vehicle width direction can be adjusted. Therefore, the distance between the lower guide arm 90 connected to the door arm 6 and the door 2 connected to the other end of the lower guide arm 90 in the vehicle width direction can be adjusted.

[0072] As described above, according to an embodiment of the present invention, in the inward-swinging door structure of a vehicle, by finely adjusting the step difference of the door to minimize the gap around the door, dust and other contaminants can be prevented from being introduced into the vehicle, and wind noise can be minimized.

[0073] In addition, the step difference can be easily adjusted in the direction perpendicular to the door and in the vehicle width direction by adjusting the bolts or nuts, thereby achieving a watertight structure.

[0074] Although the invention has been described in conjunction with what are now considered practical embodiments, it should be understood that the invention is not limited to the disclosed embodiments. Rather, the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. An inward-swinging door structure for a vehicle, comprising doors arranged parallel to each other on both sides of the vehicle's entrance, and a door arm mounted on one side of the doors to open or close the doors by rotation, the inward-swinging door structure further comprising: A central door support, one end of which is fixed to a surface at the upper center of the door and extends in a direction perpendicular to the door; A roller bracket, one end of which is attached to the other end of the central gate bracket in a direction perpendicular to the central gate bracket; A roller, mounted and coupled to the other end of the roller bracket, is used to roll and rotate when in contact with a track on the upper side of the vehicle body of the door; The lower door bracket has one end fixed to the lower side of the door-side vehicle body, and the other end attached to the lower end of the door arm; and The lower guide arm has one end rotatably attached to the lower end of the door arm, while its other end is fixed to the lower surface of the door. in: One end of the lower guide arm is inserted into and connected between the other end of the lower door bracket and the lower end of the door arm; The other end of the lower support has a lower long hole; and The lower guide arm fixing bolt passes through and is inserted into the lower long hole, so that the lower door bracket and the lower guide arm are fixed to the lower end of the door arm by bolts.

2. The inward-swinging door structure of the vehicle according to claim 1, wherein: The roller support includes: The first roller support is connected to the central gate support, and The second roller support extends integrally with and is attached to the first roller support; and The radius of the first roller support is greater than the radius of the second roller support, where the two radii refer to the radii along the horizontal direction of the vehicle.

3. The inward-swinging door structure of the vehicle according to claim 2, wherein: The central axis of the first roller support is eccentric relative to the central axis of the second roller support.

4. The inward-swinging door structure of the vehicle according to claim 3, wherein: The central axis of the first roller support is spaced 4 mm to 6 mm apart from the central axis of the second roller support.

5. The inward-swinging door structure of the vehicle according to claim 2, further comprising a central door bracket fixing bolt, wherein: One end of the first roller bracket is fixed to the other end of the central gate bracket by the fixing bolt of the central gate bracket.

6. The inward-swinging door structure of the vehicle according to claim 1, further comprising: The upper door support has one end fixed to the upper surface of the door between the door arm and the central door support, and extends in a direction perpendicular to the door. A pivot pin, mounted in a direction perpendicular to the upper door support, passes through the upper door support; and An upper guide arm, one end of which is rotatably coupled to one end of the pivot pin, and the other end of which is fixed to the door arm to extend horizontally into the door.

7. The inward-swinging door structure of the vehicle according to claim 6 further includes upper door bracket fixing bolts, wherein: One end of the upper door bracket is fixed to the upper surface of the door by the upper door bracket fixing bolt.

8. The inward-swinging door structure of a vehicle according to claim 6, wherein: The pivot pin passes through the upper door bracket opening in the upper door bracket, and The upper door bracket is fixedly installed on both sides of the opening of the upper door bracket by nuts.

9. The inward-swinging door structure of a vehicle according to claim 6, wherein: One end of the upper guide arm has an opening for inserting the pivot pin; and The upper guide arm opening has a ball joint that rolls and rotates within the upper guide arm opening and is fixed to one end of the pivot pin.

10. The inward-swinging door structure of a vehicle according to claim 6, wherein: One end of the pin has a locking protrusion so that the pin can be locked to the inlet side of the upper guide arm opening into which the pin is inserted.

11. The inward-swinging door structure of the vehicle according to claim 6, further comprising a pivot pin fixing bolt, wherein: One end of the axle pin and one end of the upper guide arm are connected by the axle pin fixing bolt.

12. The inward-swinging door structure of the vehicle according to claim 1, further comprising lower door bracket fixing bolts, wherein: One end of the lower support frame has an upper long hole; and The lower door bracket fixing bolt is inserted into the upper long hole, so that the lower door bracket is fixed to the lower side of the door side vehicle body.

13. The inward-swinging door structure of the vehicle according to claim 1, further comprising a fixing pin, wherein: The retaining pin passes through and engages with the other end of the lower guide arm; and The retaining pin is rotatably inserted into a retaining pin insertion member placed on the lower surface of the door.

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