Side element of a vehicle and subframe for a vehicle

Abstract

Side element of a vehicle, comprising: a front side member extending in a longitudinal direction of the vehicle; a rear side member extending in the longitudinal direction of the vehicle and disposed at a rear side of the front side member; a first side member connecting part having first insertion holes into which the front side member and the rear side member are inserted; and a second side member connecting part having a second insertion hole into which the rear side member is inserted.

Description

Background1. Area

[0001] Exemplary embodiments of the present disclosure relate to a side member of a vehicle and a subframe of a vehicle, and more particularly to the side member of the vehicle capable of increasing rigidity at a connecting portion between members and the subframe for the vehicle including the side member. 2. Description of the state of the art

[0002] Vehicle subframes are generally divided into a front subframe mounted in an engine compartment and a rear subframe mounted at the rear of the vehicle. The front subframe is installed on a body that forms the engine compartment to support the engine and transmission, and is connected to a suspension device, such as a lower control arm, to increase the structural rigidity of the vehicle while facilitating load transfer. The rear subframe is installed on a rear body of the vehicle and is connected to various suspension links to increase the structural rigidity of the vehicle.

[0003] Under the subframe, an aluminum subframe is manufactured by welding several individual aluminum parts with aluminum extruded profiles and joining the individual parts together.

[0004] The subframe, which consists of multiple welded elements, is simple in terms of a specific structure connecting parts of the vehicle body and therefore has limitations in increasing the rigidity of the vehicle body. Furthermore, there is a problem that the overall weight of the subframe increases, and a disadvantage is that it is difficult to precisely adjust the rigidity to match the target natural frequency.

[0005] The background technology of the present disclosure is disclosed in Korean Patent Registration No. 10-1415464 (published on June 27, 2014, entitled "Subframe for Vehicle"). Summary

[0006] Various embodiments relate to a side member of a vehicle that can increase rigidity at a connecting portion between members and simplify the structure and a subframe for the vehicle including the side member.

[0007] In one embodiment of the present disclosure, a side member for a vehicle includes a front side member extending in a longitudinal direction of the vehicle, a rear side member extending in the longitudinal direction of the vehicle and disposed at a rear side of the front side member, a first side member connecting part having first insertion holes into which the front side member and the rear side member are inserted, and a second side member connecting part having a second insertion hole into which the rear side member is inserted.

[0008] The side member may further include an impact beam bracket mounted on a side of the front side member to absorb impacts transmitted to a vehicle body.

[0009] The impact beam bracket may include an impact beam body having a mounting hole in which a screw thread is formed, and an impact beam projection extending outwardly from the impact beam body and having a width smaller than the impact beam body, and the front side member may include an impact beam insertion hole having a cross section corresponding to a cross section of the impact beam projection on one side.

[0010] In one embodiment of the present disclosure, a subframe of a vehicle includes a pair of side members spaced apart in a width direction of the vehicle, a front cross member part arranged in the width direction of the vehicle and having both ends attached to the pair of side members, and a rear cross member part arranged in the width direction of the vehicle, disposed at the rear of the front side member, and having both ends fitted into the pair of side members. Each of the side members may include front side members spaced apart in the width direction of the vehicle, rear side members spaced apart in the width direction of the vehicle and disposed at the rear of the front side members, and a first side member connecting part having first insertion holes into which the front side member and rear side members are respectively inserted.the rear side member are inserted, and a second side member connecting part having second insertion holes into which the rear side members are inserted.

[0011] The first side member connecting part may include a first cross member insertion hole whose cross section corresponds to a cross section of the front cross member part so that the front cross member part is fitted therein.

[0012] The rear side member may have a second cross member insertion hole having a cross section corresponding to the cross section of the rear cross member so that the rear cross member is fitted therein.

[0013] The rear cross member part may include a rear cross member attached to the rear side member and a rear cross member bracket extending through the rear cross member and supporting the rear cross member.

[0014] The subframe of a vehicle may further comprise a buffer member arranged in a longitudinal direction of the rear cross member and mounted on the rear cross member.

[0015] The rear cross member bracket may have a buffer groove on the underside where the buffer part is mounted.

[0016] The subframe of a vehicle may further include an impact beam bracket mounted on the side of the front side member for absorbing impacts transmitted to a vehicle body, and a bumper impact beam mounted to the impact beam bracket with a connecting member and having an escapement surrounding the connecting member to prevent damage to the connecting member.

[0017] The side member of a vehicle and the subframe of a vehicle having the same according to the present disclosure can increase the rigidity through a fitting process without excessively increasing the weight of the vehicle.

[0018] The side member of a vehicle according to the present disclosure and the subframe of a vehicle having the same are manufactured using an aluminum alloy material and an extrusion process to reduce the weight of the vehicle.

[0019] The side member of a vehicle and the subframe of a vehicle having the same according to the present disclosure can effectively support the load transmitted to the vehicle body through the buffer member.

[0020] The side member of a vehicle and the subframe for the vehicle having the same according to the present disclosure can ensure the durability performance of a suspension device and the chassis module through the buffer part.

[0021] The side member of a vehicle and the subframe of a vehicle having the same according to the present disclosure can simplify the structure by the fitting method and shorten the process time.

[0022] The side member of a vehicle and the subframe of a vehicle having the same according to the present disclosure can be easily adapted to specifications between vehicle models by cutting and sawing aluminum extrusions. Brief description of the drawings Fig. 1 is a perspective view schematically illustrating a side member of a vehicle according to an embodiment of the present disclosure. Fig. 2 is an exploded perspective view schematically illustrating a side member of a vehicle according to an embodiment of the present disclosure. Fig. 3 schematically shows a front side member of a side member of a vehicle according to an embodiment of the present disclosure. Fig. 4 schematically shows a rear side member of a side member of a vehicle according to an embodiment of the present disclosure. Fig. 5 schematically shows a first side member connecting part of a side member of a vehicle according to an embodiment of the present disclosure. Fig. 6 schematically shows a second side member connecting part of a side member of a vehicle according to an embodiment of the present disclosure. Fig. 7 schematically shows a connection relationship of a side member of a vehicle according to an embodiment of the present disclosure. Fig. 8 schematically illustrates an impact beam mount of a side member of a vehicle according to an embodiment of the present disclosure. Fig. 9 schematically shows a subframe of a vehicle according to an embodiment of the present disclosure. Fig. 10 is an exploded perspective view schematically illustrating a subframe of a vehicle according to an embodiment of the present disclosure. Fig. 11 schematically shows a connection relationship between a front side member and a side member of a subframe of a vehicle according to an embodiment of the present disclosure. Fig. 12 schematically shows a rear cross member part of a subframe of a vehicle according to an embodiment of the present disclosure. Fig. 13 schematically shows a connection relationship between a rear cross member part and a rear side member of a subframe of a vehicle according to an embodiment of the present disclosure. Fig. 14 schematically shows a buffer part of a subframe of a vehicle according to an embodiment of the present disclosure. Fig. 15 schematically illustrates a bumper impact beam of a subframe of a vehicle according to an embodiment of the present disclosure. Detailed description

[0023] Hereinafter, an embodiment of a side member of a vehicle and a subframe of a vehicle including the same according to the present disclosure will be described in detail with reference to the accompanying drawings based on various exemplary embodiments. Note that the thickness of each line or the size of each component in the drawings may be exaggerated for clarity and ease of description.

[0024] The thickness of a line or the size of an element depicted in the drawings may be exaggerated for clarity. The terms described below have been defined with their functions in mind in this disclosure and may vary depending on the intention or approach of the user or operator. Therefore, these terms should be interpreted within the context of this description.

[0025] Furthermore, in this specification, when a part is "connected (or joined)" to another part, it means not only that it is "directly connected (or joined)" to another part, but also that it is "indirectly connected (or joined)" to another intervening element. In this specification, when a part "includes (or has)" a component, it means that it may "include (or have)" other components in addition, rather than excluding other components, unless expressly stated otherwise.

[0026] The object and effect of the present disclosure will become clearer from the following description and are not limited solely by this description. If the description of the known technology unnecessarily obscures the essence of the present disclosure, a detailed description will be omitted.

[0027] Fig. 1 is a perspective view schematically illustrating a side member 1 of a vehicle according to an embodiment of the present disclosure.

[0028] With reference to Fig. 1, the side member 1 of a vehicle comprises a front side member 110, a rear side member 120, a first side member connecting part 130 and a second side member connecting part 140.

[0029] Fig. 2 is an exploded perspective view schematically illustrating the side member of a vehicle according to an embodiment of the present disclosure.

[0030] With reference to Fig. 2, the front side member 110, the rear side member 120, the first side member connecting part 130 and the second side member connecting part 140 are assembled and connected on a single axis.

[0031] The side member 1 according to an embodiment of the present disclosure extends in a direction parallel to a longitudinal direction of the vehicle and provides longitudinal rigidity to the vehicle. The side members 1 are arranged in pairs and spaced at a predetermined interval in the width direction of the vehicle.

[0032] Fig. 3 schematically shows the front side member 110 of the side member of a vehicle according to an embodiment of the present disclosure.

[0033] With reference to Fig. 3, the front side member 110 extends in the longitudinal direction of the vehicle. The front side member 110 may be provided in pairs in the vehicle, with the individual side members 110 spaced apart from each other in a width direction of the vehicle. Bolt holes 112 are formed at an upper end of the front side member 110. The screw holes 112 are provided with screw threads, and a suspension part is screwed through these screw holes 112.

[0034] The front side member 110 includes impact beam insertion holes 111. The front side member 110 includes the impact beam insertion holes 111, each having a cross section corresponding to the cross section of an impact beam projection 152 of Fig. 8, which will be described later, on one side of the front side member 110. Accordingly, the front side member 110 is equipped and assembled with an impact beam bracket 150, so that the front side member 110 and the impact beam bracket 150 can be easily connected.

[0035] The side surface of the front side member 110 is divided into a plurality of spaces by a first partition part 113. By disposing the first partition part 113 in a hollow portion of the front side member 110, the strength of the front side member 110 can be increased. Furthermore, the first partition part 113 can determine the size of the impact beam insertion hole 111. That is, by changing the arrangement of the first partition part 113, the extent to which the impact beam bracket 150 is inserted can be adjusted.

[0036] Fig. 4 schematically shows the rear side member 120 of the side member of a vehicle according to an embodiment of the present disclosure.

[0037] With reference to Fig. 4, the rear side member 120 extends in the longitudinal direction of the vehicle and is provided at the rear of the front side member 110. The rear side members 120 may be provided in pairs in the vehicle, with each rear side member 120 being spaced apart from each other in the width direction of the vehicle.

[0038] The rear side element 120 comprises a second cross member insertion hole 121, the cross section of which corresponds to the cross section of a rear cross member part 300 of Fig. 9, so that the rear cross member part 300 described later is inserted into the second cross member insertion hole 121. The second cross member insertion hole 121 is provided in a rectangular shape. Both ends of the rear cross member part 300 located in the width direction of the vehicle are inserted into the second cross member insertion hole 121.

[0039] The rear side element 120 comprises a buffer receiving part 122 on the underside. A buffer part 400 made of Fig. 14, which will be described later, is located on the underside of the buffer receiving part 122. The buffer receiving part 122 is provided with a buffer groove 323 made of Fig. 13, which is provided in the rear cross member part 300.

[0040] The rear side member 120 has the same cross-sectional shape as the front side member 110. That is, the front side member 110 and the rear side member 120 are extruded with the same cross-section.

[0041] The front side member 110 and the rear side member 120 form a main frame of the side member 1. The side member 1, which forms the side of the subframe 2 of the vehicle, is provided with a constant width in this case to support the vehicle body with high rigidity. Accordingly, both the front side member 110 and the rear side member 120 are formed with a constant width.

[0042] Since the front side member 110 and the rear side member 120 are extruded with the same cross-section, the front side member 110 and the rear side member 120 are formed with a specific width. Furthermore, after the front side member 110 and the rear side member 120 are extruded, the front side member 110 and the rear side member 120 are cut to a length corresponding to the vehicle specifications.

[0043] Accordingly, the side member 1 according to an embodiment of the present disclosure is formed such that the front side member 110 and the rear side member 120 have the same width, thereby improving durability, and can conform to the specifications of the vehicle body by a technique of extrusion and cutting or sawing processing.

[0044] Fig. 5 schematically shows the first side member connecting part 130 of the side member of a vehicle according to an embodiment of the present disclosure.

[0045] With reference to Fig. 5, the first side member connecting part 130 is provided with first insertion holes 131 into which the front side member 110 and the rear side member 120 are respectively inserted so that the front side member 110 and the rear side member 120 are arranged in series.

[0046] The front side member 110 is inserted into one side of the first side member connecting part 130, and the rear side member 120 is inserted into the other side of the first side member connecting part 130. Since the cross sections of the front side member 110 and the rear side member 120 are extruded with the same shape, the first insertion holes 131 into which the front side member 110 and the rear side member 120 are inserted can be provided with the same cross-sectional shape as the front side member 110 and the rear side member 120.

[0047] A first mounting hole 133, to which a front lower link bracket (not shown) can be attached, is provided on the underside of the first side member connecting part 130. Unlike the case where the first mounting hole 133 is located on the front side member 110 or the rear side member 120, the first mounting hole 133 is located on the first side member connecting part 130, so that the front lower link bracket can be attached stably and without stress.

[0048] A second partition wall portion 134 is disposed between the adjacent first insertion holes 131 of the first side member connecting portion 130. The front side member 110 and the rear side member 120 are in surface contact on both sides of the second partition wall portion 134. The second partition wall portion 134 bears the load of the first side member connecting portion 130 and reinforces the strength of the first side member connecting portion 130.

[0049] The second partition wall 134 is arranged to adjust the lengths of the front side member 110 and the rear side member 120. For example, when the length of the front side member 110 is set to be short and that of the rear side member 120 is set to be long, the front side member 110 and the rear side member 120 are trimmed after extrusion and bonded to the second partition wall 134 to contact the second partition wall 134, so that the lengths of the front side member 110 and the rear side member 120 can be precisely and variably adjusted. Accordingly, the dimensional accuracy of the side member 1 of the vehicle according to an embodiment of the present disclosure can be improved.

[0050] Fig. 6 schematically shows the second side member connecting part 140 of the side member of a vehicle according to an embodiment of the present disclosure.

[0051] With reference to Fig. 6, the second side member connecting part 140 is provided with a second insertion hole 141 into which the rear side member 120 is inserted.

[0052] The second insertion hole 141 is based on Fig. 6 is provided on the left side. Like the first insertion hole 131, the second insertion hole 141 also has a cross-sectional shape corresponding to the cross-sectional shape of the rear side member 120. One end of the rear side member 120 is inserted into the first insertion hole 131, and the other end of the rear side member 120 is inserted into the second insertion hole 141.

[0053] A second mounting hole 142 is provided on the underside of the rear side member 120, into which a rear lower link bracket (not shown) can be mounted. The rear lower link bracket is inserted into and coupled to the second mounting hole 142.

[0054] Fig. 7 schematically shows a connection relationship of the side member 1 of a vehicle according to an embodiment of the present disclosure.

[0055] With reference to Fig. 7, the front side member 110 and the rear side member 120 of the side member 1 according to an embodiment of the present disclosure are arranged in series via the first side member connecting part 130. Accordingly, the front side member 110, the rear side member 120, as well as the first side member connecting part 130 and the second side member connecting part 140 connecting the front side member 110 and the rear side member 120, are provided on an axis, as shown in Fig. 7 shown.

[0056] The first side member connecting part 130 is arranged between the front side member 110 and the rear side member 120. As a result, the front side member 110 and the rear side member 120 do not collide when the vehicle body vibrates, and durability and rigidity can be ensured.

[0057] Fig. 8 schematically illustrates an impact beam mount 150 of the side member of a vehicle according to an embodiment of the present disclosure.

[0058] With reference to Fig. 8, the side member 1 of a vehicle according to an embodiment of the present disclosure further includes the impact beam bracket 150 mounted on the side of the front side member 110 and absorbing impacts transmitted to the vehicle body.

[0059] The impact beam bracket 150 includes an impact beam body 151 and an impact beam projection 152.

[0060] The impact beam body 151 is provided with mounting holes 153, each of which has a screw thread formed at one end. The impact beam body 151 is connected to a bumper impact beam 500 (see Fig. 9). As a result, the impact beam bracket 150 can absorb the impact transmitted from the bumper impact beam 500.

[0061] The impact beam projection 152 extends outwardly from the impact beam body 151 and has a smaller width than the impact beam body 151. Since the impact beam projection 152 has a beveled surface, the width of the impact beam projection 152 is smaller than the width of the impact beam body 151. When the narrower impact beam projection 152 is inserted into the impact beam insertion hole 111 of Fig. 3 having a cross section corresponding to the cross section of the impact beam projection 152, the impact beam bracket 150 and the front side member 110 can be joined together accordingly.

[0062] Fig. 9 schematically shows a subframe 2 of a vehicle according to an embodiment of the present disclosure, and Fig. 10 is an exploded perspective view schematically showing the subframe of a vehicle according to an embodiment of the present disclosure.

[0063] With reference to Fig. 9 and Fig. 10, the subframe 2 of a vehicle comprises a pair of side members 1, a front cross member part 200 and a rear cross member part 300.

[0064] The pair of side members 1 are arranged spaced apart from each other in a width direction of the vehicle. Each side member 1 includes a front side member 110, a rear side member 120, a first side member connecting part 130, and a second side member connecting part 140.

[0065] The configurations of the front side member 110, the rear side member 120, the first side member connecting part 130 and the second side member connecting part 140 are clear from the description with reference to Fig. 1 to Fig. 8, and therefore, for the sake of simplicity of explanation, a detailed description thereof will be omitted. In explaining the subframe 2 for the vehicle according to the present embodiment, the reference numerals of the subframe 2 shown in FIG. Fig. 1 to Fig. 8 described page element 1 is used unchanged.

[0066] Fig. 11 schematically illustrates a connection relationship between the front side member and the side member of the sub-frame of a vehicle according to an embodiment of the present disclosure.

[0067] A front cross member part 200 is arranged in a width direction of the vehicle and both ends of the front cross member part 200 are fixed to the pair of side members 1 made of Fig. 10 attached.

[0068] Specifically, the first side member connecting part 130 includes a first cross member insertion hole 132 with a cross section corresponding to the cross section of the front cross member part 200, so that it can be fitted therein. Accordingly, by fitting the front cross member part 200 into the first cross member insertion hole 132, the first side member connecting part 130 and the front cross member part 200 are connected to each other. Stability can then be ensured by welding.

[0069] With reference to Fig. 11, the first cross member insertion hole 132 is provided with a step to adjust the insertion width so that only a portion of the front cross member part 200 passes through the first cross member insertion hole 132. The step serves as a stop and can adjust the length at which the front cross member part 200 is arranged.

[0070] The rear side member 120 is arranged in the width direction of the vehicle, is located at the rear of the front cross member part 200, and both ends can be attached to the pair of side members 1.

[0071] Fig. 12 schematically shows a rear cross member part 300 of the subframe of a vehicle according to an embodiment of the present disclosure.

[0072] With reference to Fig. 12, the rear cross member part 300 includes a rear cross member 310 fitted into the rear side member 120 and a rear cross member bracket 320 passing through the rear cross member 310 and supporting the rear cross member 310.

[0073] Fig. 13 schematically illustrates a connection relationship between the rear cross member part 300 and the rear side member 120 of the subframe of a vehicle according to an embodiment of the present disclosure.

[0074] With reference to Fig. 13, the rear side member 120 includes a second cross member insertion hole 121 having a cross section corresponding to the cross section of the rear cross member part 300, so that the rear cross member part 300 can be fitted. By seamlessly fitting both ends of the rear cross member 310 into the second cross member insertion hole 121 of the rear side member 120, the rigidity of the subframe 2 for the vehicle according to the embodiment of the present invention can be increased.

[0075] The rear cross member 310 is aligned centrally in the width direction of the vehicle and is provided with a buffer part 400 on the underside to ensure the internal strength of the subframe 2 against the load of the vehicle body during travel.

[0076] The rear cross member bracket 320 has machined square holes on the side and top, as well as two holes with machined screw threads on the bottom. A side square hole 321 of the rear cross member bracket 320 corresponds to the cross section of the rear cross member 310. An upper square hole 322 of the rear cross member bracket 320 is arranged for additional welding to the rear side member 310. As a result, the rigidity of the rear cross member part 300 can be ensured.

[0077] Fig. 14 schematically shows the buffer part 400 of the subframe of a vehicle according to an embodiment of the present disclosure.

[0078] With reference to Fig. 14 together with Fig. 13, the subframe of a vehicle according to an embodiment of the present disclosure is provided in a longitudinal direction of the rear cross member part 300 and further includes the buffer part 400 mounted on the rear cross member part 300.

[0079] The buffer part 400 can be designed as a leaf spring, replacing a conventional coil spring. The leaf spring bears the load occurring during sudden acceleration and braking of the vehicle, thereby ensuring a stable ride.

[0080] The leaf spring contains glass fiber reinforced plastic (GFRP). In addition to basic materials such as polymers, metals, carbon, and ceramics, the leaf spring also contains materials reinforced with fibers, thread-like crystals, and finely dispersed particles to prevent fatigue fractures or corrosion caused by salty moisture in winter.

[0081] The rear cross member bracket 320 is provided with a buffer groove 323 on the underside in which the buffer part 400 is mounted. Referring to Fig. 13, the buffer part 400 is mounted in the concave shaped buffer groove 323.

[0082] Fig. 15 schematically illustrates a bumper impact beam 500 of the subframe of a vehicle according to an embodiment of the present disclosure.

[0083] With reference to Fig. 15, the subframe 2 of a vehicle according to an embodiment of the present disclosure further includes the bumper impact beam 500 including an impact beam bracket 150 mounted on the side of the front side member 110 to absorb impacts transmitted to the vehicle body, and an escapement part 510 mounted to the impact beam bracket 150 with a connecting member 511 and surrounding the connecting member 511 to prevent damage to the connecting member 511.

[0084] In this embodiment, the impact beam bracket 150 and the bumper impact beam 500 are described as being bolted together by way of example, but the present disclosure is not limited to this example, and various modifications are possible. The connecting element 511 may be a screw.

[0085] When the impact beam bracket 150 and the bumper impact beam 500 are as shown in Fig.15, the screws may protrude outwardly and the bumper impact beam 500 may be provided with a cover 510 surrounding the screws to prevent damage caused by the screws.

[0086] In this embodiment, the escape part 510 is provided in a triangular shape. Accordingly, the escape part 510 can efficiently protect the connecting element 511 without wasting unnecessary space by only surrounding the connecting element 511.

[0087] Each of the side member 1, the impact beam bracket, the bumper impact beam, the front cross member 200, and the rear cross member 300 can be extruded. After extrusion, the side member 1, the impact beam bracket, the bumper impact beam, the front cross member 200, and the rear cross member 300 are cut or sawn according to the vehicle specifications, thus making it possible to accommodate different vehicle specifications.

[0088] In addition, each of the side member 1, the impact beam bracket, the bumper impact beam, the front cross member 200, and the rear cross member 300 includes an aluminum material, thereby reducing the weight of the vehicle body while securely supporting the load applied when the vehicle is running, and simplifying the structure of the vehicle subframe 2.

[0089] Accordingly, the following effects can be achieved in a side member of a vehicle and a subframe of a vehicle including the same according to an embodiment of the present disclosure.

[0090] The side member of a vehicle and the subframe of a vehicle having the same according to the present disclosure can increase the rigidity through a fitting process without excessively increasing the weight of the vehicle.

[0091] The side member of a vehicle according to the present disclosure and the subframe of a vehicle having the same are manufactured using an aluminum alloy material and an extrusion process to reduce the weight of the vehicle.

[0092] The side member of a vehicle and the subframe of a vehicle having the same according to the present disclosure can effectively support the load transmitted to the vehicle body through the buffer member.

[0093] The side member of a vehicle and the subframe for the vehicle having the same according to the present disclosure can ensure the durability performance of a suspension device and the chassis module through the buffer part.

[0094] The side member of a vehicle and the subframe of a vehicle having the same according to the present disclosure can simplify the structure by the fitting method and shorten the process time.

[0095] The side member of a vehicle and the subframe of a vehicle having the same according to the present disclosure can be easily adapted to the specifications between vehicle models by cutting and sawing the aluminum extrusions.

[0096] Although exemplary embodiments of the disclosure have been presented for illustrative purposes, it will be apparent to those skilled in the art that various modifications, additions, and substitutions are possible without departing from the scope and spirit of the disclosure as defined in the appended claims. Therefore, the true technical scope of the disclosure is defined by the following claims.

Claims

[1] Side element of a vehicle, comprising: a front side member extending in a longitudinal direction of the vehicle; a rear side member extending in the longitudinal direction of the vehicle and disposed at a rear side of the front side member; a first side member connecting part having first insertion holes into which the front side member and the rear side member are inserted; and a second side member connecting part having a second insertion hole into which the rear side member is inserted. [2] The side member of claim 1, further comprising an impact beam bracket mounted on a side of the front side member to absorb impacts transmitted to a vehicle body. [3] A side member according to claim 2, wherein the impact beam support comprises: an impact beam body having a mounting hole in which a screw thread is formed; and an impact beam projection extending outwardly from the impact beam body and having a smaller width than the impact beam body, wherein the front side member has an impact beam insertion hole having a cross section corresponding to a cross section of the impact beam projection. [4] Subframe of a vehicle, comprising: a pair of side members spaced apart in a width direction of the vehicle; a front cross member arranged in the width direction of the vehicle and having both ends attached to the pair of side members; and a rear cross member arranged in the width direction of the vehicle, arranged at the rear of the front side member, and having both ends fitted into the pair of side members, where each of the page elements includes: front side elements spaced apart in the width direction of the vehicle; rear side members spaced apart in the width direction of the vehicle and arranged at the rear of the front side members; a first side member connecting part having first insertion holes into which the front side member and the rear side member are inserted, respectively; and a second side member connecting part having second insertion holes into which the rear side members are inserted. [5] The subframe according to claim 4, wherein the first side member connecting part includes a first cross member insertion hole whose cross section corresponds to a cross section of the front cross member part so that the front cross member part is fitted therein. [6] The subframe according to claim 4 or 5, wherein the rear side member has a second cross member insertion hole having a cross section corresponding to the cross section of the rear cross member so that the rear cross member is fitted therein. [7] Subframe according to one of claims 4 to 6, wherein the rear cross member part comprises: a rear cross member attached to the rear side member; and a rear cross member bracket that passes through the rear cross member and supports the rear cross member. [8] The subframe according to claim 7, further comprising a buffer member arranged in a longitudinal direction of the rear cross member member and mounted on the rear cross member member. [9] The subframe of claim 8, wherein the rear cross member bracket has a buffer groove on the underside in which the buffer member is mounted. [10] Subframe according to claim 9, further comprising: an impact beam bracket mounted on the side of the front side member for absorbing impacts transmitted to a vehicle body; and a bumper impact beam mounted to the impact beam bracket by a connecting member and having an escapement surrounding the connecting member to prevent damage to the connecting member.

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