Lower rail for adjusting the position of a vehicle seat

Abstract

A lower rail for a vehicle seat includes a structure with a curved movement path in which the seat can be moved in an oblique direction or a diagonal direction according to different seat positions, thereby allowing a degree of freedom for adjusting a seat position movement. Furthermore, the lower rail includes a curved inner channel bent at a predetermined angle and a curved outer channel inclined at approximately the same angle as the curved inner channel, which are separately provided and configured to be combined with each other to provide a curved movement path for moving the seat.

Description

BACKGROUND(a) Technical field

[0001] The present invention relates to a lower rail for position adjustment of a vehicle seat, in particular to the lower rail for the vehicle seat having a curved movement path to provide a degree of freedom for adjusting the seat position. (b) Description of related art

[0002] Generally, vehicle seats are manufactured with a structure that includes a seat cushion to support the passenger's lower body in a sitting position, a backrest to support the passenger's upper body, and a headrest to support the passenger's neck and head. In addition, various mechanisms are provided for adjusting the seating position, for example, depending on body shape and seating position.

[0003] The structural features for position adjustment of a vehicle seat include a seat track mechanism for adjusting a front and rear position of the seat, a seat height adjustment mechanism for adjusting the seat height, and a backrest adjustment mechanism for adjusting an angle of the backrest.

[0004] Typically, the seat track mechanism includes a straight lower track fixedly mounted to a floor channel to move the seat forward or backward, and an upper track inserted and fixed to move forward and backward into the lower track, the upper track being mounted to a seat cushion frame that forms a skeleton of the seat cushion.

[0005] So when the upper rail slides forward or backward along the lower rail, the seat will also move forward or backward along with the upper rail, allowing the front and rear position of the seat to be adjusted.

[0006] However, since the conventional seat rail described above has a structure that only allows linear movement in the forward or backward direction, a disadvantage is that the freedom for adjusting the positional movement of the seat is limited.

[0007] In other words, since the existing seat rails can only move linearly in the forward or backward direction, one disadvantage is that the seat cannot be moved in an oblique or diagonal direction with the existing structures when it is necessary to move the seat to different seating positions.

[0008] The foregoing statements are intended only to contribute to an understanding of the background of the present invention and do not imply that the present invention falls within the scope of the related art already known to a person skilled in the art. SUMMARY

[0009] Accordingly, the present invention provides a lower rail for position adjustment of a vehicle seat, wherein the lower rail provides a structure with a curved movement path so that the vehicle seat can be moved in an oblique direction or a diagonal direction according to various desired seating positions, thereby providing a degree of freedom for facilitating the seating position movement.

[0010] To achieve the above object, according to the present invention, there can be provided a lower rail for a vehicle seat, comprising: a curved inner channel bent at a predetermined angle; and a curved outer channel bent at approximately the same angle as the curved inner channel, wherein the inner channel and the outer channel are arranged separately from each other and configured to be combined with each other such that combining the inner and outer channels results in a curved movement path for moving the seat.

[0011] The inner channel and the outer channel may be bent at the same angle to provide a curved path of movement.

[0012] The curved movement path may include at least a first curved movement section and a second curved movement section.

[0013] The curved movement path may include at least a first straight movement section, a first curved movement section, an oblique movement section, a second curved movement section, or a second straight movement section.

[0014] The curved movement path may further include a first straight movement section, a first curved movement section, an oblique movement section, a second curved movement section and a second straight movement section which are continuously connected to one another.

[0015] Specifically, the inner channel may include: a first vertical support plate; a first top plate provided to protrude in an outward direction from an upper end of the first vertical support plate; a slide guide provided to protrude in the outward direction from a predetermined position on an inner surface of the first vertical support plate; and a first bottom plate connected to the outer channel by being bent in the outward direction from a lower end of the first vertical support plate.

[0016] A busbar can be inserted and mounted in a space between the first top plate and the sliding guide for energy supply.

[0017] A gear mechanism for moving the seat may be mounted on an inner surface at a lower end of the first vertical support plate and may be integrally molded or separately manufactured.

[0018] A sliding bearing configured to guide the movement of the seat may be mounted on the sliding guide.

[0019] The inner channel can be formed by bending an aluminum alloy from a soft material with a higher elongation rate compared to the outer channel.

[0020] Specifically, the outer channel may comprise: a second vertical support plate; a second upper plate provided to protrude in an inner direction from an upper end of the second vertical support plate; and a second lower plate connected to the inner channel by being bent in the inner direction from a lower end of the second vertical support plate.

[0021] A space may be provided between the second upper plate and the second lower plate as a roller insertion space into which a roller for moving the seat is inserted.

[0022] The outer channel can be formed by bending from an aluminum alloy of a high-strength material with higher strength compared to the inner channel.

[0023] In addition, the lower rail may include the inner channels and the outer channels, which are respectively connected to each other, and a first lower rail and a second lower rail, which are connected by a connecting bracket.

[0024] The connecting bracket may be provided in a structure capable of maintaining a constant width between the first lower rail and the second lower rail.

[0025] The connecting bracket may comprise: a first mounting plate and a second mounting plate fixed to the outer bottom surfaces of the first lower rail and the second lower rail, respectively; and a bridge member integrally connecting a gap between the first mounting plate and the second mounting plate and bent upward, thereby being arranged to be parallel to the top surfaces of the first lower rail and the second lower rail.

[0026] Furthermore, according to claim 18, the lower rail may further comprise a cover for blocking foreign matter, the cover being mounted over a top surface of the bridge member, the top surface of the first lower rail, and the top surface of the second lower rail, and being configured to minimize intrusion of the foreign matter into a space between the inner channel and the outer channel of each of the first lower rail and the second lower rail.

[0027] A vehicle may comprise the lower rail according to claim 1.

[0028] As described above, the present invention provides the following by the means for solving the problem described above.

[0029] First, a lower rail for a seat is improved into a structure having a curved movement path, which allows the seat to be moved in an oblique direction or a diagonal direction according to different sitting positions, thereby enabling a degree of freedom for adjusting a sitting position movement.

[0030] Secondly, considering that an anchor load of the seat belt, a passenger weight acting on the seat belt during a collision, and the like are applied to the outer channel, the outer channel can be formed by bending from an aluminum alloy made of a high-strength material having higher strength than the inner channel, thereby ensuring high strength and preventing deformation of the outer channel.

[0031] Thirdly, considering that the inner channel has a more complex structure than the outer channel, such as a sliding guide or a gear transmission, the inner channel can be provided with a high-softness aluminum alloy of a soft material, which has a higher elongation rate than the outer channel, which makes the bending and forming of the inner channel easy to perform and meets the dimensional accuracy of the inner channel.

[0032] Fourthly, the first lower rail and the second lower rail may be connected by a connecting bracket provided in a structure capable of keeping the width of a gap constant while absorbing a tolerance.

[0033] Fifthly, a busbar for the power supply can be installed in the inner channel of the lower rail, whereby the motor for moving the seat can be supplied with battery power via the busbar.

[0034] Sixth, a foreign matter blocking cover may be provided over the upper surfaces of the first lower rail, a bridge member, and the second lower rail, thereby minimizing the intrusion of foreign matter into a space between the inner channel and the outer channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Fig. 1 is a perspective view showing a lower rail for a vehicle seat according to the present invention; Fig. 2 is a cross-sectional view of the lower rail for a vehicle seat according to the present invention; Fig. 3 is a perspective view showing a state in which a first lower rail and a second lower rail for the vehicle seat according to the present invention are connected by a connecting bracket; Fig. 4 is a cross-sectional view showing the state in which the first lower rail and the second lower rail for the vehicle seat according to the present invention are connected by the connecting brackets; Fig. 5 is a perspective view showing a state in which a foreign matter blocking cover is attached to the lower rail of a vehicle seat according to the present invention; Fig. 6 is a cross-sectional view showing the state in which the foreign matter blocking cover is attached to the lower rail of a vehicle seat according to the present invention; Fig. 7, Fig. 8 and Fig. 9 are cross-sectional views each showing a coupling method between an inner channel and an outer channel constituting the lower rail for a seat of a vehicle according to the present invention; Fig. 10 is a perspective view showing a state in which an upper rail is slidably connected to the lower rail for a vehicle seat according to the present invention; and Fig. 11 is a cross-sectional view showing the state in which the upper rail is slidably connected to the lower rail for a vehicle seat according to the present invention. DETAILED DESCRIPTION

[0036] It should be understood that the term "vehicle," a similar term as used herein, encompasses motor vehicles in general, such as passenger cars including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, as well as hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum). A hybrid vehicle is a vehicle that has at least two power sources, such as both gasoline and electric vehicles. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention.The singular forms used herein include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms such as "comprise" and / or "include," when used in this specification, specify the presence of certain features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the related listed elements.Throughout this specification, unless explicitly stated otherwise, words such as "comprise" and variations such as "include" are intended to imply the inclusion of the specified elements, not the exclusion of others. In addition, terms described in this specification, such as "unit" or "module," refer to units for performing at least one function and operation, and may be implemented by hardware components or software components, and combinations thereof.

[0037] Furthermore, the control unit of the present invention may be embodied as a non-transitory computer-readable medium on a computer-readable medium containing executable program instructions executed, for example, by a processor or controller. Examples of computer-readable media include ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards, and optical data storage devices. The computer-readable medium may also be distributed in network-coupled computer systems such that the computer-readable medium is stored and executed in a distributed manner, for example, by a telematics server or a controller area network (CAN).

[0038] Specific structural and functional descriptions described in the embodiments of the present specification are merely exemplary to explain embodiments according to a concept of the present invention, and the embodiments according to the concept of the present invention can be implemented in various forms. Furthermore, the invention should not be construed as being limited to the embodiments described in the present specification and should be understood to include all modifications, equivalents, or substitutes included within its spirit and technical scope.

[0039] In the present invention, terms such as "first" and / or "second" may be used to describe various components, but the components are not limited by these terms. The above terms are used only for the purpose of distinguishing one component from other components. For example, within a range that does not deviate from the scope of the rights according to the concept of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as the first component.

[0040] For example, if a component is described as "coupled" or "connected" to another component, it may be directly coupled or connected to another component, but there may also be other components in between. On the other hand, if a component is described as "directly coupled" or "directly connected" to another component, it is assumed that there is no other component in the middle. Other terms used to describe the relationship between the individual components, such as "between" and "directly between" or "adjacent to" and "directly adjacent to," should be interpreted similarly.

[0041] Throughout the specification, like reference numerals refer to like elements. The terms used in this specification are for the purpose of describing embodiments and are not intended to be limiting of the present invention. In this specification, the singular form includes the plural form unless the context clearly indicates otherwise.

[0042] In the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0043] Fig. 1 and Fig. 2 show a lower rail for a vehicle seat according to the present invention.

[0044] As in Fig. 1 and Fig. 2, the lower rail 100 according to the present invention comprises a first lower rail 100a and a second lower rail 100b manufactured in the same structure.

[0045] In particular, the first lower rail 100a and the second lower rail 100b of the lower rail 100 each include a curved inner channel 110 and a curved outer channel 120, which are manufactured separately.

[0046] Accordingly, after an inner channel 110 and an outer channel 120 are each manufactured in a double-curved structure at approximately the same angle to provide a curved movement path 130, the first lower rail 100a and the second lower rail 100b of the lower rail 100 can each be provided in a structure that the inner channel 110 and the outer channel 120, which were manufactured separately, are connected to each other.

[0047] More specifically, after the curved inner channel 110 bent at a predetermined angle and the curved outer channel 120 bent at approximately the same angle as the curved inner channel 110 are separately manufactured, the first lower rail 100a and the second lower rail 100b of the lower rail 100 may each be provided in the structure so that the inner channel 110 and the outer channel 120, which were separately manufactured, are combined with each other to provide a curved movement path 130 for moving the seat.

[0048] As described above, the inner channel 110 and the outer channel 120 are each manufactured in a curved structure (for example, a double-curved structure) at approximately the same angle and then coupled together, whereby a curved movement path 130 can be provided within the inner channel 110 and the outer channel 120.

[0049] Here, the curved movement path 130 may be provided in a form comprising a first straight movement section 131, a first curved movement section 132, an oblique movement section 133, a second curved movement section 134, and a second straight movement section 135, which are continuously connected to each other to be able to communicate with each other.

[0050] As in Fig. 2, the inner channel 110 includes a first vertical support plate 111, a first upper plate 112 provided to protrude in an outward direction from the upper end of the first vertical support plate 111, a slide guide 113 protruding in the outward direction from a predetermined position on an inner surface of the first vertical support plate 111 and guiding the movement of the seat along the curved movement path 130, and a first lower plate 114 bent in the outward direction from a lower end of the first vertical support plate 111 and connected to the outer channel 120.

[0051] In addition, a power supply busbar 140 is inserted and mounted in the space between the first top plate 112 and the slide guide 113 of the inner channel 110, and the power supply busbar 140 serves to power the motor (in Fig. 10 designated 150) for the forward and backward movement of the seat.

[0052] For example, the power supply busbar 140 is connected so that it is capable of being connected, for example, via wiring, to the battery that supplies power, and is capable of being connected, for example, via wiring to the motor, thereby playing a role in transferring power supplied from the battery power supply to the motor 150.

[0053] In addition, the gear transmission 160 for moving the seat is integrally formed on a lower inner surface of the first vertical support plate 111 of the inner channel 110 or is separately manufactured and assembled.

[0054] In other words, the gear mechanism 160 may be integrally formed on the lower inner surface of the first vertical support plate 111 when forming the inner channel 110. Alternatively, the gear mechanism 160 may be manufactured separately and mounted, for example, by means of screws, on the lower inner surface of the first vertical support plate 111.

[0055] As in the Fig. 10 and Fig. 11, a pinion 154, which is rotated by the drive of the motor 150, is engaged with the gear train 160.

[0056] In addition, a sliding bearing 170 for guiding the movement of the seat along the curved movement path 130 can be inserted and mounted in the sliding guide 113 of the inner channel 110.

[0057] In particular, since the inner channel 110 has a more complex structure than the outer channel 120, such as a sliding guide 113 or a gear transmission 160, the inner channel 110 can be formed by bending an aluminum alloy (for example, AL60 series) with high softness from a soft material having a higher elongation rate than the outer channel 120, thereby easily performing the bending and forming of the inner channel 110 and satisfying the dimensional accuracy of the inner channel 110.

[0058] As in Fig. 1 and Fig. 2, the outer channel 120 may include a second vertical support plate 121, a second top plate 122 projecting inwardly from an upper end of the second vertical support plate 121, and a second bottom plate 124 connected to the inner channel 110 by being bent in an inward direction from a lower end of the second vertical support plate 121.

[0059] Thus, a space between the second upper plate 122 and the second lower plate 124 of the outer channel 120 is provided as a roller insertion space 123 into which a roller 180 is inserted to move the seat.

[0060] In particular, considering that, for example, an anchor load of the seat belt or a passenger weight acting on the seat belt during a collision intensively acts on the outer channel 120, the outer channel 120 can be formed by bending from an aluminum alloy (e.g., AL70 series) made of a high-strength material having higher strength than the inner channel 110, whereby it is possible to secure the high strength and prevent deformation of the outer channel 120.

[0061] At the same time, if as in Fig. 7, the gear transmission 160 is integrally formed with the first vertical support plate 111 of the inner channel 110, in a state where the first sub-plate 114 of the inner channel 110 and the second sub-plate 124 of the outer channel 120 are brought into close contact with each other, the friction stir welding 500 is implemented, whereby the inner channel 110 and the outer channel 120 can be combined, providing a curved movement path 130.

[0062] If, as in Fig. 8, alternatively, when the gear transmission 160 is manufactured into a separate object, in a state where the gear transmission 160 is brought into close contact with an inner surface of the first sub-plate 114 of the inner channel 110, the gear transmission 160, the first sub-plate 114 of the inner channel 110, and the second sub-plate 124 of the outer channel 120 can be coupled by means of, for example, a bolt, whereby the inner channel 110 and the outer channel 120 can be combined, providing a curved movement path 130.

[0063] If, as in Fig. 9, the gear train 160 is manufactured into a separate article, alternatively, in a state where the gear train 160 is arranged between the first sub-plate 114 of the inner channel 110 and the second sub-plate 124 of the outer channel 120 and brought into close contact, friction stir welding 500 may be performed between the rack 160 and the first sub-plate 114, and friction stir welding 500 may be performed between the rack 160 and the second sub-plate 124, whereby the inner channel 110 and the outer channel 120 can be combined, providing a curved movement path 130.

[0064] Thus, the first top plate 112 of the inner channel 110 and the second top plate 122 of the outer channel 120 form an opening 190 and are arranged to be spaced apart from each other, whereby, as will be described later, the slider can be moved together with the upper rail along the opening 190 and the curved movement path 130.

[0065] In this way, the inner channel 110 and the outer channel 120 are coupled to each other and form a curved movement path 130, whereby the lower rail 100, including the first lower rail 100a and the second lower rail 100b, can be completed.

[0066] On the other hand, the first lower rail 100a and the second lower rail 100b, as shown in the Fig. 3 and Fig. 4, be connected by a connecting bracket 200, the connecting bracket 200 being provided in a structure capable of keeping a width of a gap constant while absorbing a tolerance.

[0067] As in Fig. 3 and Fig. 4, the connecting bracket 200 specifically includes: a first mounting plate 201 and a second mounting plate 202 attached to the lower surfaces of the first lower rail 100a and the second lower rail 100b, respectively; and a bridge member 203 integrally connecting the first mounting plate 201 and the second mounting plate 202 and disposed upward, thereby being arranged to be held parallel to the upper surfaces of the first lower rail 100a and the second lower rail 100b.

[0068] Accordingly, the first lower rail 100a and the second lower rail 100b can be firmly attached to a floor plate of the vehicle after being connected by the connecting bracket 200.

[0069] Since the opening 190 is provided between the first top plate 112 of the inner channel 110 and the second top plate 122 of the outer channel 120, the inner channel 110 and the outer channel 120 forming the first lower rail 100a and the second lower rail 100b, respectively, foreign matter that poses an obstacle to the control of the seat movement may penetrate into the curved movement path 130 through the opening 190.

[0070] To solve this problem, as described in the Fig. 5 and Fig. 6, a foreign matter blocking cover 210 may be provided over an upper surface of the bridge member 203 of the connecting bracket 200, the upper surface of the first lower rail 100a, and the upper surface of the second lower rail 100b to minimize the intrusion of foreign matter into the space between the inner channel 110 and the outer channel 120, that is, into an interior space of the curved movement path 130.

[0071] Of the total area of ​​the foreign matter blocking cover 210, each portion covering the openings 190 is provided with a flexible sealing wing 214 having a long cut hole 212, and as described later, when a slider 310 of an upper rail 300 moves along the opening 190 and the curved movement path 130, the sealing wing 214 serves as a foreign matter blocking seal while being brought into contact with the slider 310.

[0072] In the following, a structure is considered in which the upper rail is movably connected to the lower rail, which is provided with the structure described above.

[0073] Fig. 10 and Fig. 11 show a state in which the upper rail is slidably connected to the lower rail of a vehicle seat according to the present invention.

[0074] As in the Fig. 10 and Fig. 11, a seat cushion 410 of the seat 400 is connected to an upper part of the upper rail 300, and the slider 310 is integrally connected to a lower part of the upper rail 300.

[0075] In particular, the slider 310 is movably inserted into a space between the inner channel 110 and the outer channel 120, i.e., into the interior of the curved movement path 130, and fixed there.

[0076] For this purpose, the roller 180 for moving the seat is rotatably attached to an outer surface of the slider 310, whereby it is arranged in the roller retraction space 123 between the second upper plate 122 and the second lower plate 124 of the outer channel 120.

[0077] In addition, the sliding bearing 170 is attached to an inner surface of the slider 310, and the sliding guide 113 of the inner channel 110 is inserted into and fixed to the sliding bearing 170.

[0078] In addition, as in Fig. 11, a pinion 154 engages with the gear drive 160 provided in the inner channel 110, wherein the pinion 154 may be rotatably connected to an output part of the transmission 152 connected to the motor 150.

[0079] Thus, the battery power can be supplied to the motor 150 via the busbar 140 for power supply.

[0080] Therefore, when a rotational force corresponding to the drive of the motor 150 is transmitted to the pinion gear 154 via the gear 152, the pinion gear 154 can move forward or backward along the gear train 160. When the pinion gear 154 moves, the slider 310, the upper rail 300 integrated with the slider 310, and the seat 400 mounted on the upper rail 300 can move forward or backward.

[0081] Specifically, the slider 310 is configured to sequentially pass through the first straight movement portion 131, the first moving movement portion 132, the first oblique movement portion 133, the second oblique movement portion 134, and the second linear movement portion 135 of the curved movement path 130 provided by the inner channel 110 and the outer channel 120, so that the seat can be moved in an oblique direction or a diagonal direction according to different seat positions, and accordingly, a degree of freedom for adjusting the movement of the seat position can be improved.

[0082] Although the present invention has been described in detail with various embodiments above, the scope of the present invention is not limited to the above-described embodiments, and it should be understood that various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also included within the scope of the present invention.

Claims

[1] A lower rail for a vehicle seat, the lower rail comprising: a curved inner channel bent at a predetermined angle; and a curved outer channel which is bent at approximately the same angle as the curved inner channel, wherein the inner channel and the outer channel are arranged separately from each other and are configured to be combined with each other such that combining the inner and outer channels results in a curved path of movement for moving the seat. [2] The lower rail according to claim 1, wherein the inner channel and the outer channel are bent at the same angle to provide a curved path of movement. [3] The lower rail according to claim 2, wherein the inner channel and the outer channel are double bent at the same angle. [4] The lower rail according to claim 2, wherein the curved movement path comprises at least a first curved movement section and a second curved movement section. [5] The lower rail according to claim 2, wherein the curved movement path comprises at least a first straight movement section, a first curved movement section, an oblique movement section, a second curved movement section, or a second straight movement section. [6] The lower rail according to claim 2, wherein the curved movement path includes a first straight movement section, a first curved movement section, an oblique movement section, a second curved movement section and a second straight movement section which are continuously connected to each other. [7] The lower rail according to claim 1, wherein the inner channel comprises: a first vertical support plate; a first top plate provided to protrude in an outward direction from an upper end of the first vertical support plate; a slide guide provided so as to project in the outward direction from a predetermined position on an inner surface of the first vertical support plate; and a first sub-plate connected to the outer channel by being bent in the outward direction from a lower end of the first vertical support plate. [8] The lower rail according to claim 7, wherein a bus bar for power supply is inserted and mounted in a space between the first top plate and the slide guide. [9] The lower rail according to claim 7, wherein a gear mechanism for moving the seat is mounted on an inner surface at a lower end of the first vertical support plate, and is integrally molded or separately manufactured. [10] The lower rail according to claim 7, wherein a sliding bearing configured to guide the movement of the seat is mounted on the sliding guide. [11] The lower rail according to claim 7, wherein the inner channel is formed by bending an aluminum alloy of a soft material having a higher elongation rate compared to the outer channel. [12] The lower rail according to claim 1, wherein the outer channel comprises: a second vertical support plate; a second top plate provided to protrude in an inner direction from an upper end of the second vertical support plate; and a second sub-plate connected to the inner channel by being bent in the inward direction from a lower end of the second vertical support plate. [13] The lower rail according to claim 12, wherein a space between the second upper plate and the second lower plate is provided as a roller insertion space into which a roller for moving the seat is inserted. [14] The lower rail according to claim 12, wherein the outer channel is formed by bending from an aluminum alloy of a high-strength material having higher strength than the inner channel. [15] The lower rail according to claim 1, wherein the lower rail comprises the inner channels and the outer channels which are respectively connected to each other. [16] The lower rail according to claim 15, wherein the lower rail further comprises: a first lower rail and a second lower rail connected by a connecting bracket. [17] The lower rail according to claim 16, wherein the connecting bracket is provided in a structure capable of maintaining a width between the first lower rail and the second lower rail constant. [18] The lower rail according to claim 17, wherein the connecting bracket comprises: a first mounting plate and a second mounting plate attached to the outer undersides of the first lower rail and the second lower rail, respectively; and a bridge member integrally connecting a gap between the first mounting plate and the second mounting plate and bent upward, thereby being arranged to be parallel to the top surfaces of the first lower rail and the second lower rail. [19] The lower rail according to claim 18 further comprises a cover for blocking foreign matter, the cover being mounted over a top surface of the bridge member, the top surface of the first lower rail and the top surface of the second lower rail, and being configured to minimize the intrusion of the foreign matter into a space between the inner channel and the outer channel of both the first lower rail and the second lower rail. [20] A vehicle comprising the lower rail according to claim 1.

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