Locking structure and vehicle

Abstract

Locking structure for a straight center rail (100) for opposing sliding doors (1), the locking structure comprising: a straight center rail (100) mounted on a sliding door (1) in a longitudinal direction of the sliding door (1); a central roller unit (200) which is rollably connected to the central rail (100); and a central pivot arm (250) rotatably connected to the central roller unit (200) and a vehicle body (2), wherein the central roller unit (200) comprises a first lever (260) and a second lever (270) configured to rotate about rotation axes formed in a width direction of the center rail (100), wherein the locking structure is designed to switch between a first position in which the first lever (260) is designed to be caught by a catch portion (264) formed on the center rail (100), rotated and then locked to the second lever (270), and a second position in which the second lever (270) is designed to be caught by a catch portion formed on the central pivot arm (250), rotated and then locked to the first lever (260), and wherein in the second position the first lever (260) is designed to be released from the catch section (264) formed on the center rail (100).

Description

Technical area

[0001] The present invention relates to a locking structure for a straight center rail for opposing sliding doors and a vehicle having such a locking structure. background

[0002] Generally, a vehicle has a passenger compartment of a predetermined size in which a driver or a passenger can sit, with passenger compartment opening / closing doors attached to a vehicle body to open or close the passenger compartment.

[0003] Sliding doors for opening / closing the passenger compartment include a front sliding door installed at a front longitudinal side of the vehicle and a rear sliding door installed at a rear longitudinal side of the vehicle. The front sliding door and the rear sliding door are typically installed to move on rails attached to a vehicle body or the doors.

[0004] With reference to the Fig. 1 and Fig. 2, in the case of the sliding door for opening / closing the passenger compartment in the prior art, a center rail 10 is curvedly shaped and is configured to support a center portion of the door during the opening or closing operation of the door.

[0005] Generally, a door glass 3 is mounted to be moved up or down in a space between a door inner panel 6 and a door outer panel 7, which form a door 1. When the curved center rail 10 is mounted on the door 1, one end of the center rail 10 is bent and directed toward the door outer panel 7. In an area (see part X in Fig. 2), in which one end of the center rail 10 is bent, the space between the door inner panel 6 and the door outer panel 7 is reduced, and thus the space in which the door glass 3 is mounted is reduced.

[0006] That is, in the vehicle on which the curved center rail 10 is mounted, since an outside mirror 4 must be attached and the dividing channels 5a and 5b must be attached to the front and rear doors, there are problems in that a certain degree of design freedom is restricted, and costs are increased by the additional attachment of the above-mentioned components.

[0007] As an example of the prior art technology where the curved center rail is mounted, there is Korean patent KR 10 0 558 413 B1 (Central roller structure for automatic sliding door).

[0008] Furthermore, from DE 10 2014 114 223 A1 a rear door device in a vehicle is known, comprising: a rear door, an upper rail which is attached to the rear door in a width direction, an upper carriage which is inserted into the upper rail to support the upper rail, a lower rail which is attached to a vehicle body and which is formed with a curved portion, a lower carriage which is inserted into the lower rail and is movable along the lower rail, an upper support structure which has one end connected to the upper carriage and which has another end mounted on the vehicle body for supporting the upper carriage, and a connecting structure for connecting the lower carriage to the upper rail.The rear door device allows the rear door to be opened or closed by sliding the door forward and backward in the length direction of the vehicle.

[0009] EP 1 916 133 A1 further discloses a sliding door structure for a vehicle, which is designed to slide a door body relative to an opening portion of a vehicle body in the forward and backward direction of the vehicle body for opening and closing. The sliding door structure includes a rail arranged on the door body and aligned with the forward and backward direction of the vehicle body. An arm protrudes from an edge portion on a door opening direction side of the opening portion of the vehicle body and is configured to engage the rail to support the door body in the forward and backward direction. overview

[0010] The present invention relates to a locking structure for a linear center rail for opposing sliding doors. Specific embodiments include a locking structure for a linear center rail in which levers are locked during a door opening or closing operation to prevent the sliding door from deviating in a vehicle in which the linear center rails are mounted on the sliding doors.

[0011] It is an object of the present invention to provide a novel structure that can be locked or unlocked by a straight center rail in a simple configuration in which the straight center rail is attached to a sliding door to improve a degree of design freedom.

[0012] The object is achieved by a locking structure having the features of claim 1 and a vehicle having the features of claim 11. Advantageous further developments can be found in the subclaims.

[0013] An exemplary embodiment of the present invention provides a locking structure for a linear center rail for opposing sliding doors, the locking structure comprising a linear center rail mounted on the sliding door in the longitudinal direction of the sliding door, a center roller unit rollably connected to the center rail, and a center pivot arm rotatably connected to the center roller unit and a vehicle body. The center roller unit includes first and second levers that rotate about pivot axes formed in the width direction of the center rail.The locking structure can change between a first position in which the first lever is caught by a catch portion formed on the center rail, rotated and then locked to the second lever, and a second position in which the second lever is caught by a catch portion formed on the center pivot arm, rotated and then locked to the first lever, wherein in the structure in the second position the first lever is released from the catch portion formed on the center rail.

[0014] Since the straight center rail is attached to the sliding door, the degree of design freedom can be improved according to embodiments of the present invention.

[0015] Since the locking structure for the straight center rail is assembled by assembling individual components of the rail, according to embodiments of this invention, only the broken components can be separately and easily replaced with a new component.

[0016] According to embodiments of this invention, the locking structure for the straight center rail can control the movement of the center roller unit through the locking or unlocking operation of the locking structure. Short description of the drawings Fig. 1 is a view illustrating a state in which a curved center rail is applied to a sliding door according to a conventional technology. Fig. 2 is a view showing a cross section along the line AA' in Fig. 1 represents. Fig. 3 is a view illustrating a state in which a locking structure for a straight center rail for opposing sliding doors according to an exemplary embodiment of the present invention is applied to the sliding door. Fig. 4 is a view showing a cross section along the line BB' in Fig. 3 represents. Fig. 5 is a view showing the center rail according to an exemplary embodiment of the present invention. Fig. 6 is a view showing the center roller unit according to an exemplary embodiment of the present invention. Fig. 7 is a view showing a glider made of Fig. 6 represents. Fig. 8 is a view showing a first lever according to an exemplary embodiment of the present invention. Fig. 9 is a view illustrating a second lever according to an exemplary embodiment of the present invention. Fig. 10 is a view illustrating a lever spring according to an exemplary embodiment of the present invention. Fig. 11 is a view illustrating a state in which the levers and the lever spring are coupled according to an exemplary embodiment of the present invention. Fig. 12 is a view illustrating a state in which the first lever and the second lever assume a first position in a state in which the sliding door is closed. Fig. 13 is a view illustrating a state in which the first lever and the second lever assume a second position in a state in which the sliding door is opened. Detailed description of exemplary embodiments

[0017] Below, exemplary embodiments of a locking structure for a straight center rail for opposing sliding doors according to the present invention are described in detail with reference to the drawings. The terms or words used herein are not limited to a generic or dictionary-like meaning and should be construed as a meaning and concept that conforms to the technical principle of the present invention, based on the principle that an inventor can appropriately define a term to describe their own invention with the best method.

[0018] A locking structure for a linear center rail for opposing sliding doors according to an exemplary embodiment of the present invention is applied to a linear center rail 100 (hereinafter referred to as "center rail") mounted in the longitudinal direction of a sliding door 1 (hereinafter referred to as "door").

[0019] Specifically, the doors 1 include a front door and a rear door, and the locking structure for the linear center rail for the opposing sliding doors according to an exemplary embodiment of the present invention is applied to the center rail 100 of the front door and / or the rear door. The locking structures for the linear center rails for the opposing sliding doors, which are mounted on the front and rear doors, are identical in structure and operating principle. In the present specification, for the sake of simplicity, an example is described in which the locking structure for the linear center rail for the opposing sliding doors is mounted on any one of the front and rear doors.

[0020] Fig. 3 is a view illustrating a state in which a locking structure for a straight center rail for an opposite sliding door according to an exemplary embodiment of the present invention is applied to the sliding door, and Fig. 4 is a view showing a cross section along the line BB' in Fig. 3 illustrates.

[0021] With reference to Fig. 3 and Fig. 4, the center rail 100 according to an exemplary embodiment of the present invention has a rectilinear shape. That is, unlike the curved center rail 10 mounted on the door 1, the rectilinear center rail 100 extends parallel to a door inner panel 6 and a door outer panel 7 of the door 1, with one end of the center rail 100 not facing the inside of the door 1. Therefore, a space between the door inner panel 6 and the door outer panel 7 of the door 1 can be utilized, and the degree of design freedom is improved when the rectilinear center rail 100 is mounted on the door 1 than when the curved center rail 10 is mounted on the door 1.

[0022] Fig. 5 is a view showing a center rail according to an exemplary embodiment of the present invention.

[0023] In relation to Fig. 5, the center rail 100 has a center rail groove 101 formed in the longitudinal direction of the center rail 100, and a center roller unit 200 to be described below is coupled to the center rail groove 101 in a rollable manner, so that the center rail groove 101 serves as a moving path of the center roller unit 200.

[0024] The center rail 100 has a center rail striker 103 formed in the width direction of the center rail 100. The center rail striker 103 is formed on one side of the center rail 100. When the door 1 is the rear door, the center rail striker 103 is provided at a right position of the center rail 100 as shown in FIG. Fig. 5. When the door 1 is the front door, the center rail striker 103 is mounted at a left position of the center rail 100 based on Fig. 5 formed.

[0025] Fig. 6 is a view illustrating a center roller unit according to an exemplary embodiment of the present invention, and Fig. 7 is a view showing a glider in Fig. 6 illustrates.

[0026] With reference to Fig. 6 and Fig. 7, the central roller unit 200 includes a slider 210, a lower end lever support unit 220, and an upper end lever support unit 230.

[0027] A bearing 212 is rotatably connected to the slider 210. The bearing 212 is seated on the central rail groove 101 and can be rotated while in contact with an inner wall of the central rail groove 101. In the slider 210, the lower-end lever support unit 220 is configured such that a first lever 260 and a second lever 270, which will be described below, are rotatably connected to the lower-end lever support unit 220. One end of a first lever center pin 242, one end of a second lever center pin 244, and one end of a rotation limiting member 246 are rotatably connected to the lower-end lever support unit 220. In the exemplary embodiment of the present invention, a rotation limiting center pin 247 is inserted into the rotation limiting member 246. However, only the rotation limiting member 246 may be provided.In the lower end lever support unit 220, a connecting hole (not shown) for the swing arm is formed at the lower end.

[0028] The upper-end lever support unit 230 is detachably connected to the slider 210, and the upper-end lever support unit 230 is positioned above the lower-end lever support unit 220 so as to oppose the lower-end lever support unit 220. The other end of the first lever center pin 242, the other end of the second lever center pin 244, and the other end of the rotation-limiting center pin 247 are rotatably connected to the upper-end lever support unit 230. Therefore, the first lever center pin 242, the second lever center pin 244, and the rotation-limiting center pin 247, which are connected to the upper-end lever support unit 230, can rotate with respect to the upper-end lever support unit 230 and the lower-end lever support unit 220. A connecting hole 232 for the upper swing arm is formed in the upper-end lever support unit 230.

[0029] The slider 210 is rotatably connected to a central swing arm 250. Specifically, the central swing arm 250 has holes whose size corresponds to the connecting hole 232 at the upper end of the swing arm and the connecting hole 232 at the lower end of the swing arm (not shown). A swing arm connecting pin 234 is inserted into the holes in a state where the centers of the holes are aligned with each other, so that the slider 210 and the central swing arm 250 are connected to each other. Meanwhile, the central swing arm 250 is rotatably connected to a swing arm bracket 255 fixedly mounted on a vehicle body 2.

[0030] The central pivot arm 250 has a central roller striker 253 formed in the width direction of the center rail 100. Therefore, when the central pivot arm 250 rotates, the central roller striker 253 also rotates.

[0031] Fig. Fig. 8 is a view illustrating a first lever according to an exemplary embodiment of the present invention, and Fig. 9 is a view illustrating a second lever according to an exemplary embodiment of the present invention.

[0032] With reference to Fig. 8, the first lever 260 includes a first lever insertion hole 261, a first striker insertion portion 262, a catch portion 264, a first locking portion 266, and a first locking groove 267.

[0033] The first lever insertion hole 261 is formed in the first lever 260 so that the first lever center pin 242 can be inserted into the first lever insertion hole 261. In an exemplary embodiment of the present invention, when the first lever center pin 242 is inserted into the first lever insertion hole 261, the first lever 260 is fixed to the first lever center pin 242. Therefore, the first lever 260 can rotate together with the first lever center pin 242. Of course, in another exemplary embodiment of the present invention, the first lever center pin 242 can be fixed, and the first lever 260 can rotate.

[0034] The first striker insertion portion 262 is a portion into which the center rail striker 103 is to be inserted. The first striker insertion portion 262 has a groove shape recessed toward the inside of the first lever 260. The first insertion guide projections 263a and 263b are formed on both sides of the first striker insertion portion 262. Here, one first insertion guide projection 263a is longer than the other first insertion guide projection 263b.

[0035] The catching portion 264 has a protruding shape so that the catching portion 264 is caught by the rotation limiting element 246. The catching portion 264 includes a catching surface 264-1. When the first lever 260 rotates, and thus the catching surface 264-1 comes into contact with the rotation limiting element 246, the rotation is limited.

[0036] The first locking portion 266 has an outwardly projecting shape so that the first locking portion 266 is captured by the second lever 270. The first locking portion 266 is defined by a first of the first locking shaped surfaces 266-1 and a second of the first locking shaped surfaces 266-2, which are approximately inclined. The first of the first locking shaped surfaces 266-1 and the capture surface 264-1 are inclined inwardly and meet, thereby defining a capture groove 265. According to the exemplary embodiment of the present invention, the second of the first locking shaped surfaces 266-2 projects outwardly and has a predetermined curvature.

[0037] The first locking groove 267 has an inwardly recessed shape such that the first locking groove 267 is captured by the second lever 270. The first locking groove 267 is defined by the second of the first locking molding surfaces 266-2 and a third of the first locking molding surfaces 267-1, which are approximately inclined.

[0038] With reference to Fig. 9, the second lever 270 includes a second lever insertion hole 271, a second striker insertion portion 272, a second locking portion 276, and a second locking groove 277.

[0039] The second lever insertion hole 271 is formed in the second lever 270 such that the second lever center pin 244 can be inserted into the second lever insertion hole 271. In an exemplary embodiment of the present invention, the second lever center pin 244 is inserted into the second lever insertion hole 271, and the second lever 270 is fixed to the second lever center pin 244. Therefore, the second lever 270 can rotate together with the second lever center pin 244. Of course, in another exemplary embodiment of the present invention, the second lever center pin 244 can be fixed, and the second lever 270 can rotate.

[0040] The second striker insertion portion 272 is a portion into which the central roller striker 253 is inserted. The insertion portion 272 has a groove shape recessed toward the inside of the second lever 270. The second insertion guide projections 273a and 273b are formed on both sides of the second striker insertion portion 272. Here, one second insertion guide projection 273a is longer than the other second insertion guide projection 273b.

[0041] The second locking portion 276 has an outwardly projecting shape so that the second locking portion 276 is engaged by the first lever 260. The second locking portion 276 is defined by a first of the second locking shaped surfaces 276-1 and a second of the second locking shaped surfaces 276-2, which are approximately inclined. According to the exemplary embodiment of the present invention, the first of the second locking shaped surfaces 276-1 is recessed inward and has a predetermined curvature, and the second of the second locking shaped surfaces 276-2 protrudes outward and has a predetermined curvature. The second locking portion 276 can be inserted into the first locking groove 267.

[0042] The second locking groove 277 has an inwardly recessed shape so that the second locking groove 277 is captured by the first lever 260. The second locking groove 277 is defined by the second of the second locking molding surfaces 276-2 and a third of the second locking molding surfaces 277-1, which are approximately inclined. The first locking portion 266 can be inserted into the second locking groove 277.

[0043] Meanwhile, a second insertion hole for the spring end 275 according to an exemplary embodiment of the present invention is formed in the second lever 270. A function of the second spring end insertion hole 275 is described below.

[0044] Fig. 10 is a view showing a lever spring according to an exemplary embodiment of the present invention, and Fig. 11 is a view showing a state in which the levers and the lever spring are coupled according to an exemplary embodiment of the present invention.

[0045] A lever spring 280 is connected to the first lever 260 and the second lever 270, whereby the lever spring 280 exerts an elastic force through its rotation. The lever spring 280 has Fig. 10 and Fig. 11 shows a form in which two coil springs, namely a first spring 281 and a second spring 285, are connected to each other. The lever spring 280 is arranged below the first lever 260 and the second lever 270.

[0046] A first spring insertion hole 282 is formed in the first spring 281 so that the first lever center pin 242 can be inserted into the first spring insertion hole 282. One end of the first spring 281 is connected to the second spring 285, and a first spring end 283 having a bent shape is formed at the other end of the first spring 281.

[0047] A second spring insertion hole 286 is formed in the second spring 285 so that the second lever center pin 244 can be inserted into the second spring insertion hole 286. One end of the second spring 285 is connected to the first spring 281, and a second spring end 287 having a bent shape is formed at the other end of the second spring 285.

[0048] Meanwhile, the first and second spring ends 283 and 287, which are in Fig. 10, in a state in which no external force is applied, this state being referred to as the spring equilibrium state.

[0049] With reference to Fig. 11, the first spring 281 is positioned under the first lever 260, and the second spring 285 is positioned under the second lever 270. In this state, the first spring end 283 can move along the first locking surface 266-1 of the first lever 260, and the second spring end 287 is inserted into the insertion hole 275 of the second lever 270.

[0050] Fig. 12 is a view illustrating a state in which the first lever and the second lever assume a first position in a state in which the sliding door is closed, and Fig. 13 is a view illustrating a state in which the first lever and the second lever assume a second position in a state in which the sliding door is opened.

[0051] In the following, an operation procedure of the locking structure for the straight center rail for opposite sliding doors according to an exemplary embodiment of the present invention will be described with reference to Fig. 12 and Fig. 13. In the Fig. 12 and Fig. 13 some configurations are omitted for easier description.

[0052] With reference to Fig. 12, when an external force is applied in a direction indicated by F1 and the door 1 is closed, the center rail striker 103 is inserted into the first striker insertion portion 262, the first locking portion 266 is inserted into the second locking groove 277 (locked state), and the catching portion 264 is caught by the rotation-limiting member 246. Therefore, the door 1 cannot move further even if an external force in the direction indicated by F1 continues to act on the door 1. At this time, the first lever 260 assumes a position approximately perpendicular to the center rail 100, and the second lever 270 assumes a position approximately parallel to the center rail 100. This position is referred to as the first position.

[0053] In the first position, the first spring end 283 is caught by the capture groove 265, and the second spring end 287 is inserted into the second spring end insertion hole 275. Here, while the second spring 285 is in the spring equilibrium state, the first spring 281 is rotated while an external force is applied counterclockwise to the first spring end 283 in the spring equilibrium state of the first spring 281. Therefore, a clockwise elastic restoring force is exerted on the first lever 260 by the first spring 281. However, since the first lever 260 and the second lever 270 are locked together, the first lever 260 does not rotate clockwise.

[0054] In relation to Fig. 13, when an external force is applied in the direction indicated by F2, the central pivot arm 250 is rotated, and the central roller striker 253 is inserted into the second striker insertion portion 272. Here, since one second insertion guide projection 273a is longer than the other second insertion guide projection 273b, the central roller striker 253 can be easily inserted.

[0055] The second lever 270 is rotated clockwise by the center roller striker 253. When the second lever 270 rotates, the first locking portion 266 is pulled out of the second locking groove 267 (unlocked state), and the first lever 260 is rotated clockwise by the elastic restoring force of the first spring 281, so that the center rail striker 103 is pulled out of the first insertion portion 262. When the first lever 260 and the second lever 270 continuously rotate and the second of the first locking molding surfaces 266-2 and the first of the second locking molding surfaces 276-1 come into contact with each other, the second locking portion 276 is inserted into the first locking groove 267 (locked state), and the second insertion guide projection 273a is caught by the rotation limiting member 246. Since the slider 210 can move to the left along the center rail 100, the door 1 is opened.The first lever 260 assumes a position approximately parallel to the center rail 100, and the second lever 270 assumes a position approximately perpendicular to the center rail 100. This position is referred to as the second position.

[0056] In this case, the first spring end 283 moves in the capture groove 265 along the first of the first locking molding surfaces 266-1, so that the first spring 281 is in a spring equilibrium state. The second spring 285 is rotated clockwise by the central roller striker 253 by an external force. Therefore, a counterclockwise elastic restoring force is exerted on the second lever 270 by the second spring 285. However, since the first lever 260 and the second lever 270 are locked together, the second lever 270 does not rotate counterclockwise.

[0057] Next, a process is described in which the open state of door 1 (which is shown in Fig. 13) to the closed state of door 1 (the state shown in Fig. 12 shown state).

[0058] When an external force is applied in the direction indicated by F1 in the state where the door 1 is opened, the slider 210 moves to the right, and the center rail striker 103 is inserted into the first stopper insertion portion 262. Here, since the first insertion guide projection 263a is longer than the other insertion guide projection 263b, the center rail striker 103 can be easily inserted.

[0059] The first lever 260 is rotated counterclockwise by the center rail striker 103. When the first lever 260 rotates, the second locking portion 276 is pulled out of the first locking groove 267 (unlocked state), and the second lever 270 is rotated counterclockwise by the elastic restoring force of the second spring 285, allowing the center rail striker 253 to be pulled out of the second insertion portion 272. When the center pivot arm 250 continues to rotate, the center roller striker 253 is fully retracted.When the first lever 260 and the second lever 270 continuously rotate and the second of the first locking molding surfaces 266-2 and the third of the second locking molding surfaces 277-1 come into contact with each other, the first locking portion 266 is inserted into the second locking groove 277 (locked state), and the catching portion 264 is caught by the rotation limiting member 246. In this state, the first lever 260 and the second lever 270 assume the first position, and the door 1 cannot be moved further even though an external force in the direction indicated by F1 continues to act on the door 1.

[0060] According to an exemplary embodiment of the present invention, the first and second positions in which the first and second levers 260 and 270 are locked together can be maintained even when the external force is applied to the door 1 in the directions indicated by F1 and F2, whereby the door 1 can be prevented from deviating from the track during the opening or closing operation of the door 1.

Claims

[1] Locking structure for a straight center rail (100) for opposing sliding doors (1), the locking structure comprising: a straight center rail (100) mounted on a sliding door (1) in a longitudinal direction of the sliding door (1); a central roller unit (200) which is rollably connected to the central rail (100); and a central pivot arm (250) rotatably connected to the central roller unit (200) and a vehicle body (2), wherein the central roller unit (200) comprises a first lever (260) and a second lever (270) configured to rotate about rotation axes formed in a width direction of the center rail (100), wherein the locking structure is designed to switch between a first position in which the first lever (260) is designed to be caught by a catch portion (264) formed on the center rail (100), rotated and then locked to the second lever (270), and a second position in which the second lever (270) is designed to be caught by a catch portion formed on the central pivot arm (250), rotated and then locked to the first lever (260), and wherein in the second position the first lever (260) is designed to be released from the catch section (264) formed on the center rail (100). [2] The locking structure according to claim 1, wherein in the first position, the second lever (270) is configured to be caught and rotated by the catching portion formed on the central pivot arm (250), and the second lever (270) and the first lever (260) are configured to be unlocked and assume the second position. [3] The locking structure according to claim 1, wherein the first lever (260) is configured to be caught and rotated by the catching portion formed on the central pivot arm (250) in the second position, and the first lever (260) and the second lever (270) are configured to be unlocked and assume the first position. [4] The locking structure according to claim 1, wherein a center rail striker (103) formed in the width direction of the center rail (100) is formed on the center rail (100) such that the first lever (260) is formed to be caught and rotated by the center rail striker (103), and a center roller striker is formed on the center swing arm (250) such that the second lever (270) is formed to be caught and rotated by the center roller striker. [5] The locking structure of claim 4, wherein the first lever (260) comprises: a first insertion portion (262) in which the center rail striker (103) is configured to be inserted; and a plurality of first insertion guide projections (263a, 263b) formed on both sides of the first insertion portion (262). [6] The locking structure of claim 5, wherein the second lever (270) comprises: a second insertion portion (272) in which the central roller striker is adapted to be inserted; and a plurality of second insertion guide projections (273a, 273b) formed on both sides of the second insertion portion (272). [7] The locking structure according to claim 6, wherein a first insertion guide projection (263a) formed on a first side among the plurality of first insertion guide projections (263a, 263b) is longer than another first insertion guide projection (263b) formed on a second side, and wherein a second insertion guide projection (273a) formed on a first side among the plurality of second insertion guide projections (273a, 273b) is longer than another second insertion guide projection (273b) formed on a second side. [8] The locking structure of claim 1, wherein the first lever (260) comprises: a first locking portion (266) having an outwardly projecting shape and configured to be caught by the second lever (270) in the first position; and a first locking groove (267) having an inwardly recessed shape and adapted to be caught by the second lever (270) in the second position. [9] The locking structure of claim 8, wherein the second lever (270) comprises: a second locking portion (276) having an outwardly projecting shape and adapted to be inserted into the first locking groove (267); and a second locking groove (277) having an inwardly recessed shape and adapted to receive the first locking portion (266). [10] The locking structure according to claim 1, wherein the central roller unit (200) includes a rotation limiting member (246) configured to limit rotation of the first lever (260), and wherein the first lever (260) includes a catching portion (264) configured to be caught by the rotation limiting member (246) in accordance with a rotation state. [11] Vehicle comprising: a vehicle body (2); and a sliding door (1), the sliding door (1) comprising a locking structure comprising: a straight center rail (100) mounted on the sliding door (1) in the longitudinal direction of the sliding door; a central roller unit (200) which is rollably connected to the central rail (100); and a central pivot arm (250) which is rotatably connected to the central roller unit (200) and the vehicle body (2), wherein the central roller unit (200) comprises a first lever (260) and a second lever (270) configured to rotate about rotation axes formed in a width direction of the center rail (100), wherein the locking structure is designed to switch between a first position in which the first lever (260)l is designed to be caught by a catch portion (264) formed on the center rail (100), rotated and then locked to the second lever (270), and a second position in which the second lever (270) is designed to be caught by a catch portion formed on the central pivot arm (250), rotated and then locked to the first lever (260), and wherein in the second position the first lever (260) is designed to be released from the catch section (264) formed on the center rail (100). [12] A vehicle according to claim 11, wherein in the first position, the second lever (270) is configured to be caught and rotated by the catch portion formed on the central pivot arm (250), and wherein the second lever (270) and the first lever (260) are configured to be unlocked and assume the second position. [13] A vehicle according to claim 11, wherein the first lever (260) is adapted to be caught and rotated in the second position by the catch portion formed on the central pivot arm (250), and wherein the first lever (260) and the second lever (270) are adapted to be unlocked and to assume the first position. [14] A vehicle according to claim 11, further comprising: a center rail striker (103) formed on the center rail (100) in the width direction of the center rail (100), wherein the first lever (260) is configured to be caught and rotated by the center rail striker (103); and a central roller striker formed on the central pivot arm (250), wherein the second lever (270) is configured to be caught and rotated by the central roller striker. [15] A vehicle according to claim 14, wherein the first lever (260) comprises: a first insertion portion (262) in which the center rail striker (103) is configured to be inserted; and a plurality of first insertion guide projections (263a, 263b) formed on both sides of the first insertion portion (262). [16] A vehicle according to claim 15, wherein the second lever (270) comprises: a second insertion portion (272) in which the central roller striker is adapted to be inserted; and a plurality of second insertion guide projections (273a, 273b) formed on both sides of the second insertion portion (272). [17] A vehicle according to claim 16, wherein: one of the first insertion guide projections (263a) located on a first side of the first insertion portion (262) is longer than another of the first insertion guide projections (263b) located on a second side of the first insertion portion (262); and one of the second insertion guide projections (273a) located on a first side of the second insertion portion (272) is longer than another of the second insertion guide projections (273b) located on a second side of the second insertion portion (272). [18] A vehicle according to claim 11, wherein the first lever (260) comprises: a first locking portion (266) having an outwardly projecting shape and configured to be caught by the second lever (270) in the first position; and a first locking groove (267) having an inwardly recessed shape, the first locking groove (267) being configured to be caught by the second lever (270) in the second position. [19] A vehicle according to claim 18, wherein the second lever (270) comprises: a second locking portion (276) having an outwardly projecting shape, the second locking portion (276) being adapted to be inserted into the first locking groove (267); and a second locking groove (277) having an inwardly recessed shape, wherein the first locking portion (266) is adapted to be inserted into the second locking groove (277). [20] The vehicle according to claim 11, wherein the central roller unit (200) includes a rotation limiting member (246) configured to limit rotation of the first lever (260), and wherein the first lever (260) includes a catching portion (264) configured to be caught by the rotation limiting member (246) in accordance with a rotation state.

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