Vehicle floor frame

Abstract

A vehicle floor frame includes a middle frame, a rear frame disposed rearward of the middle frame, a connecting unit connecting the middle frame and the rear frame, a pair of support frames disposed rearward of the middle frame, a front load member disposed between the middle frame and the rear frame, and a rear load member disposed between the middle frame and the rear frame. A pair of support frames is disposed on both sides of the connection unit between the middle frame and the rear frame, a front load member connects a front portion of the connection unit and the middle frame, and a rear load member connects a rear portion of the connection unit and the rear frame.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10 - 2023 - 0178080, filed on December 8, 2023, the entire content of which is incorporated herein by reference. Technical field

[0003] The present invention relates to a vehicle floor frame. Background art

[0004] Buses may include doors for passengers to enter and exit and ramps for facilitating the entry and exit of wheelchairs and the like.

[0005] In recent years, in order to improve the punctuality and speed of public transportation, a middle - bus - only lane (or middle - express lane) system has been introduced. When the middle - bus - only lane system is put into use, it is expected that the travel time of existing routes may be significantly reduced.

[0006] Meanwhile, when the middle - bus - only lane system is introduced, an island - type bus stop needs to be applied. When the island - type bus stop is applied, the road - environment efficiency and the convenience of passenger entry and exit can be improved. In response to the application of the island - type bus stop, a bus may need to have a pair of doors provided on the left and right sides to open and close separately, and a pair of ramps corresponding to the pair of doors respectively. The pair of doors can be arranged to face each other with respect to the central longitudinal axis of the vehicle body, and the pair of ramps can be provided on the vehicle floor frame to face each other with respect to the central longitudinal axis of the floor frame. Since each ramp is not a rigid member and a part of the vehicle floor frame needs to be removed when installing the pair of ramps on the vehicle floor frame, the stiffness of the vehicle body may be significantly reduced. Therefore, the stiffness of the vehicle body having a pair of facing doors and a pair of facing ramps may be relatively reduced.

[0007] The above - described information in this background - art section is provided to assist in understanding the background of the inventive concept and may include any technical concept that is not considered to be known prior art. Summary of the invention

[0008] The present invention relates to a vehicle floor frame. Certain embodiments relate to a vehicle floor frame designed to improve the stiffness of the vehicle body.

[0009] Embodiments of the present invention can solve the problems that occur in the prior art while completely maintaining the advantages achieved by the prior art.

[0010] Embodiments of the present invention provide a vehicle floor frame designed to improve the stiffness of a vehicle body having a pair of facing doors and a pair of facing ramps.

[0011] According to an embodiment of the present invention, a vehicle floor frame may include a middle frame, a rear frame, a connection unit, a pair of support frames, a front load member, and a rear load member. The rear frame is located behind the middle frame. The connection unit connects the middle frame and the rear frame. A pair of support frames are disposed on both sides of the connection unit. The front load member connects the front portion and the middle frame of the connection unit. The rear load member connects the rear portion and the rear frame of the connection unit. Among them, a pair of support frames are disposed between the middle frame and the rear frame.

[0012] The connection unit may include a pair of structural members aligned with the central longitudinal axis of the middle frame and the central longitudinal axis of the rear frame.

[0013] The connection unit may further include a reinforcing member interposed between the pair of structural members.

[0014] A pair of support frames may be respectively connected to the pair of structural members.

[0015] The middle frame may include a main cross member and an end cross member located behind the main cross member. The front end of each structural member may be fixed to the central portion of the end cross member of the middle frame.

[0016] Two front load members may connect the main cross member of the middle frame and the end cross member of the middle frame. The rear ends of the two front load members may be aligned with the front ends of the pair of structural members.

[0017] One front load member may connect the main cross member of the middle frame and the end cross member of the middle frame. The front end of the front load member may be fixed to the central portion of the main cross member of the middle frame, and the rear end of the front load member may be fixed to the central portion of the end cross member of the middle frame.

[0018] The front load member may include a pair of front extension portions symmetrically disposed at the front portion of the front load member and a pair of rear extension portions symmetrically disposed at the rear portion of the front load member.

[0019] The rear frame may include a main cross member and an end cross member located in front of the main cross member. The rear end of each structural member may be fixed to the central portion of the end cross member of the rear frame.

[0020] Three rear load members may connect the main cross member of the rear frame and the end cross member of the rear frame. The front ends of the three rear load members may be aligned with the rear ends of the pair of structural members.

[0021] One rear load member may connect the main cross member of the rear frame and the end cross member of the rear frame. The front end of the rear load member may be fixed to the central portion of the end cross member of the rear frame, and the rear end of the rear load member may be fixed to the central portion of the main cross member of the rear frame.

[0022] The rear load member may include a pair of front extension portions symmetrically disposed at the front of the rear load member and a pair of rear extension portions symmetrically disposed at the rear of the rear load member.

[0023] The cross-sectional area of the structural member may be greater than the cross-sectional area of the end cross member of the middle frame and the cross-sectional area of the end cross member of the rear frame.

[0024] The structural member may be thicker than the end cross member of the middle frame and the end cross member of the rear frame.

[0025] The top surface of the structural member may be flush with the top surfaces of the end cross members of the middle frame and the rear frame. The bottom surface of the structural member may be located at a position lower than the bottom surfaces of the end cross members of the middle frame and the rear frame.

[0026] The vehicle floor frame may further include a front reinforcement fixed to the bottom surface of the end cross member of the middle frame. The front reinforcement may be aligned with the front end of each of the pair of structural members.

[0027] The bottom surface of the front reinforcement may be flush with the bottom surface of each of the pair of structural members.

[0028] The vehicle floor frame may further include a rear reinforcement fixed to the bottom surface of the end cross member of the rear frame. The rear reinforcement may be aligned with the rear end of each of the pair of structural members.

[0029] The bottom surface of the rear reinforcement may be flush with the bottom surface of each of the pair of structural members. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects, features, and advantages of the various embodiments of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0031] Figure 1 A perspective view of a vehicle floor frame according to an exemplary embodiment of the present invention is shown;

[0032] Figure 2 As shown along Figure 1 The bottom perspective view of the vehicle floor frame as viewed in the direction of arrow A shown in

[0033] Figure 3 As shown Figure 2 An enlarged schematic view of the connection of a pair of structural members, reinforcement members, front load members, and rear load members in the vehicle floor frame shown in

[0034] Figure 4 As shownFigures 1 to 3 The load distribution in the vehicle floor frame shown in

[0035] Figure 5 A perspective view of a vehicle floor frame according to another exemplary embodiment of the present invention is shown;

[0036] Figure 6 shown along Figure 5 A bottom perspective view of the vehicle floor frame as viewed in the direction of arrow B shown in

[0037] Figure 7 shown Figure 6 An enlarged schematic view of the connection of a pair of structural members, reinforcing members, front load members, and rear load members in the vehicle floor frame shown in ; and

[0038] Figure 8 shown Figures 5 to 7 The load distribution in the vehicle floor frame shown in

[0039] Description of reference numerals:

[0040] 11: Middle frame

[0041] 12: Rear frame

[0042] 13: First structural member

[0043] 14: Second structural member

[0044] 15: Reinforcing member

[0045] 16a, 16b: Front load members

[0046] 17a, 17b, 17c: Rear load members

[0047] 18: Front load member

[0048] 19: Rear load member

[0049] 20: Support frame

[0050] 21: Longitudinal member

[0051] 22: Transverse member

[0052] 31: Main cross beam

[0053] 32: End cross beam

[0054] 33: Front reinforcement

[0055] 34: Front cross beam

[0056] 35a, 35b: Diagonal members

[0057] 36a, 36b: Side longitudinal members

[0058] 41: Main cross beam

[0059] 42: End cross beam

[0060] 43: Rear reinforcement

[0061] 44: Additional longitudinal member

[0062] 45a, 45b: Side longitudinal members. Detailed implementation manners

[0063] The exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, the same reference numerals will always be used to denote the same or equivalent elements. In addition, detailed descriptions of well-known technologies associated with the present invention will be omitted to avoid unnecessarily obscuring the gist of the present invention.

[0064] Terms such as first, second, A, B, (a), and (b) may be used to describe elements in the exemplary embodiments of the present invention. These terms are only used to distinguish one element from another, and the essential features, order, or sequence of the corresponding elements are not limited by these terms. Unless otherwise defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Terms defined in a general dictionary should be interpreted as having the same meaning as their context in the relevant technical field, and should not be interpreted as having an ideal or excessive form of meaning unless explicitly defined in this application.

[0065] Referring to Figure 1 and Figure 2 , the vehicle floor frame according to the exemplary embodiment of the present invention may include a middle frame 11, a rear frame 12 located behind the middle frame 11, and a connection unit connecting the middle frame 11 and the rear frame 12.

[0066] Referring to Figure 1 and Figure 2 , the middle frame 11 may include a main cross beam 31, an end cross beam 32 located behind the main cross beam 31, and a front cross beam 34 located in front of the main cross beam 31.

[0067] The main cross beam 31, the end cross beam 32, and the front cross beam 34 may extend in the width direction of the vehicle. The main cross beam 31 may be a structural member that stably bears the load applied to the middle frame 11, and the stiffness of the main cross beam 31 may be higher than that of other members. The end cross beam 32 may be located at the trailing edge of the middle frame 11.

[0068] A pair of diagonal members 35a and 35b can be connected to the main cross member 31, and the pair of diagonal members 35a and 35b can be symmetrical with respect to the central longitudinal axis of the vehicle floor frame. The pair of diagonal members 35a and 35b can be inclined at a predetermined angle with respect to the central longitudinal axis of the vehicle floor frame. The pair of diagonal members 35a and 35b can be connected to cross the front cross member 34. The rear end of each of the diagonal members 35a and 35b can be fixed to the main cross member 31 using fasteners, welding, etc. The pair of diagonal members 35a and 35b can include a first diagonal member 35a facing the left side of the vehicle and a second diagonal member 35b facing the right side of the vehicle.

[0069] In addition, the middle frame 11 can further include a plurality of additional longitudinal members and a plurality of additional transverse members connected to the front cross member 34, the main cross member 31, and the end cross member 32. Each additional longitudinal member can extend in the longitudinal direction of the vehicle, and each additional transverse member can extend in the width direction of the vehicle.

[0070] Refer to Figure 2 As shown in

[0071] Refer to Figure 2 As shown in

[0072] Refer to Figure 2 As shown in

[0073] The connecting unit may include a pair of structural members 13 and 14 that connect the central portion of the middle frame 11 and the central portion of the rear frame 12. The pair of structural members 13 and 14 may be aligned with the central longitudinal axis of the middle frame 11 and the central longitudinal axis of the rear frame 12. Thus, the central longitudinal axis of the middle frame 11, the central longitudinal axis of the rear frame 12, and the pair of structural members 13 and 14 may be aligned with the central longitudinal axis of the vehicle floor frame. Each of the structural members 13 and 14 may be configured to connect the central portion of the end cross member 32 of the middle frame 11 and the central portion of the end cross member 42 of the rear frame 12. The front end of each of the structural members 13 and 14 may be fixed to the central portion of the end cross member 32 of the middle frame 11, and the rear end of each of the structural members 13 and 14 may be fixed to the central portion of the end cross member 42 of the rear frame 12.

[0074] The cross-sectional area of each of the structural members 13 and 14 may be larger than the cross-sectional area of the end cross member 32 of the middle frame 11 and the cross-sectional area of the end cross member 42 of the rear frame 12, so that the stiffness of each of the structural members 13 and 14 can be increased, and thus, the connection stiffness between the middle frame 11 and the rear frame 12 can be improved through each of the structural members 13 and 14.

[0075] The pair of structural members 13 and 14 may include a first structural member 13 facing the left side of the vehicle and a second structural member 14 facing the right side of the vehicle. The first structural member 13 and the second structural member 14 may be spaced apart from each other by a predetermined gap.

[0076] According to an exemplary embodiment of the present invention, the connecting unit may further include a reinforcing member 15 interposed between the pair of structural members 13 and 14. The two sides of the reinforcing member 15 may be fixed to the pair of structural members 13 and 14 respectively by welding or the like. The front end of the reinforcing member 15 may be fixed to the central portion of the end cross member 32 of the middle frame 11, and the rear end of the reinforcing member 15 may be fixed to the central portion of the end cross member 42 of the rear frame 12. The pair of structural members 13 and 14 and the reinforcing member 15 may be aligned with the central longitudinal axis of the vehicle floor frame. Thus, the pair of structural members 13 and 14 and the reinforcing member 15 may connect the middle frame 11 and the rear frame 12 along the central longitudinal axis of the vehicle floor frame, so that the stiffness of the vehicle floor frame can be improved.

[0077] According to an exemplary embodiment, each of the structural members 13 and 14 and the reinforcing member 15 may be thicker than the end cross member 32 of the middle frame 11 and the end cross member 42 of the rear frame 12. Each of the structural members 13 and 14 and the reinforcing member 15 may have the same thickness.

[0078] Refer to Figure 1, the top surfaces of each of the structural members 13 and 14 and the top surface of the reinforcing member 15 can be flush with the top surface of the end cross member 32 of the middle frame 11 and the top surface of the end cross member 42 of the rear frame 12.

[0079] Referring to Figure 2 , the bottom surfaces of each of the structural members 13 and 14 and the bottom surface of the reinforcing member 15 can be located at a position lower than the bottom surface of the end cross member 32 of the middle frame 11 and the bottom surface of the end cross member 42 of the rear frame 12.

[0080] Referring to Figures 2 to 4 , the vehicle floor frame can further include a front reinforcing member 33 aligned with the front end of each of the pair of structural members 13 and 14 and the front end of the reinforcing member 15. The front reinforcing member 33 can be fixed to the bottom surface of the end cross member 32 of the middle frame 11 by welding. The bottom surface of the front reinforcing member 33 can be flush with the bottom surfaces of each of the structural members 13 and 14 and the bottom surface of the reinforcing member 15.

[0081] Referring to Figures 2 to 4 , the vehicle floor frame can further include a rear reinforcing member 43 aligned with the rear end of each of the pair of structural members 13 and 14 and the rear end of the reinforcing member 15. The rear reinforcing member 43 can be fixed to the bottom surface of the end cross member 42 of the rear frame 12 by welding. The bottom surface of the rear reinforcing member 43 can be flush with the bottom surfaces of each of the structural members 13 and 14 and the bottom surface of the reinforcing member 15.

[0082] The vehicle floor frame according to an exemplary embodiment of the present invention can include front load members 16a and 16b connecting the middle frame 11 and the front part of the connecting unit. Therefore, the front load members 16a and 16b can be configured to transfer the load from the middle frame 11 to the connecting unit. Referring to Figures 1 to 4 , the two front load members 16a and 16b can be configured to connect the main cross member 31 of the middle frame 11 and the end cross member 32 of the middle frame 11. The two front load members 16a and 16b can be configured to transfer the load applied to the middle frame 11 to the connecting unit. The two front load members 16a and 16b can include a first front load member 16a facing the left side of the vehicle and a second front load member 16b facing the right side of the vehicle.

[0083] The front end of the first front load member 16a can be fixed to the left part of the main cross member 31 using fasteners, welding, etc., and the rear end of the first front load member 16a can be fixed to the central part of the end cross member 32 using fasteners, welding, etc. The front end of the second front load member 16b can be fixed to the right part of the main cross member 31 using fasteners, welding, etc., and the rear end of the second front load member 16b can be fixed to the central part of the end cross member 32 using fasteners, welding, etc. The front end of the first front load member 16a can be aligned with the rear end of the first diagonal member 35a, and the front end of the second front load member 16b can be aligned with the rear end of the second diagonal member 35b. The front ends of the first front load member 16a and the second front load member 16b can be spaced apart from each other in the longitudinal direction of the main cross member 31, and the rear ends of the first front load member 16a and the second front load member 16b can be aligned with the front ends of each of a pair of structural members 13 and 14 and the front end of the reinforcing member 15.

[0084] The rear ends of the first front load member 16a and the second front load member 16b can be adjacent to each other in the central part of the end cross member 32, such that the two front load members 16a and 16b can form an approximate V shape.

[0085] The vehicle floor frame according to an exemplary embodiment of the present invention may include rear load members 17a, 17b, and 17c connecting the rear frame 12 and the rear part of the connecting unit, and the rear load members 17a, 17b, and 17c may be configured to transfer a load from the connecting unit to the rear frame 12. Refer to Figures 1 to 4 , the three rear load members 17a, 17b, and 17c may be configured to connect the main cross member 41 and the end cross member 42. The three rear load members 17a, 17b, and 17c may be configured to transfer the load applied to the structural members 13 and 14 and the reinforcing member 15 to the rear frame 12.

[0086] The three rear load members 17a, 17b, and 17c may include a first rear load member 17a facing the left side of the vehicle, a second rear load member 17b facing the right side of the vehicle, and a third rear load member 17c located between the first rear load member 17a and the second rear load member 17b.

[0087] The front end of the first rear load member 17a can be fixed to the central part of the end cross member 42 using fasteners, welding, etc., and the rear end of the first rear load member 17a can be fixed to the left part of the main cross member 41 using fasteners, welding, etc. The front end of the second rear load member 17b can be fixed to the central part of the end cross member 42 using fasteners, welding, etc., and the rear end of the second rear load member 17b can be fixed to the right part of the main cross member 41 using fasteners, welding, etc.

[0088] The front ends of the first rear load member 17a and the second rear load member 17b can be adjacent to each other at the central portion of the end cross member 42, and the rear ends of the first rear load member 17a and the second rear load member 17b can be spaced apart from each other in the longitudinal direction of the main cross member 41, such that the first rear load member 17a and the second rear load member 17b can form an approximate V shape.

[0089] The front end of the third rear load member 17c can be fixed to the central portion of the end cross member 42 using fasteners, welding, etc., and the front end of the third rear load member 17c can be located between the front ends of the first rear load member 17a and the second rear load member 17b at the central portion of the end cross member 42. The rear end of the third rear load member 17c can be fixed to the central portion of the main cross member 41 using fasteners, welding, etc. The third rear load member 17c can be aligned with the central longitudinal axis of the rear frame 12, and the third rear load member 17c can be aligned with the reinforcing member 15 along the central longitudinal axis of the vehicle floor frame.

[0090] A pair of support frames 20 can be respectively connected to a pair of structural members 13 and 14. The pair of support frames 20 can be symmetrically arranged with respect to the central longitudinal axis of the vehicle floor frame, and the pair of support frames 20 can be provided between the middle frame 11 and the rear frame 12. Therefore, a pair of ramps can be provided on the pair of support frames 20. Each support frame 20 can include a plurality of longitudinal members 21 extending in the longitudinal direction of the vehicle and a plurality of transverse members 22 extending in the width direction of the vehicle. The transverse members 22 of each support frame 20 can be fixed to the corresponding structural members 13 and 14 by welding, etc.

[0091] Referring to Figure 4 , the torsional load applied to the middle frame 11 can be transmitted to the main cross member 31 through a pair of diagonal members 35a and 35b, and the torsional load can be transmitted from the main cross member 31 to the connection unit (a pair of structural members 13 and 14 and the reinforcing member 15) through two front load members 16a and 16b. The load transmitted to the pair of structural members 13 and 14 and the reinforcing member 15 can be evenly distributed in three directions by three rear load members 17a, 17b, and 17c and transmitted to the rear frame 12.

[0092] As described above, a pair of structural members 13 and 14 and a reinforcing member 15 can be connected to the middle frame 11 by two front load members 16a and 16b, and a pair of structural members 13 and 14 and a reinforcing member 15 can be connected to the rear frame 12 by three rear load members 17a, 17b, and 17c, such that the load can be evenly distributed through the two front load members 16a and 16b, a pair of structural members 13 and 14, a reinforcing member 15, and the three rear load members 17a, 17b, and 17c. Accordingly, compared with a vehicle floor frame according to the related art, the stress generated in the vehicle floor frame according to an exemplary embodiment of the present invention can be reduced by about 31%.

[0093] Figures 5 to 8 A vehicle floor frame according to another exemplary embodiment of the present invention is shown.

[0094] Referring to Figure 5 and Figure 6 , a vehicle floor frame according to another exemplary embodiment of the present invention may include a front load member 18 configured to transfer a load from the middle frame 11 to a connection unit (a pair of structural members 13 and 14 and a reinforcing member 15). One front load member 18 may be configured to connect a main cross member 31 and an end cross member 32. The front load member 18 may extend along a central longitudinal axis of the vehicle floor frame, and the front load member 18 may be aligned with a pair of structural members 13 and 14 and a reinforcing member 15. A front end of the front load member 18 may be fixed to a central portion of the main cross member 31 using a fastener, welding, etc., and a rear end of the front load member 18 may be fixed to a central portion of the end cross member 32 using a fastener, welding, etc.

[0095] Referring to Figure 7 , the front load member 18 may include a pair of front extension portions 18a symmetrically disposed at its front portion and a pair of rear extension portions 18b symmetrically disposed at its rear portion. The pair of front extension portions 18a may be symmetrically disposed at the front portion of the front load member 18 such that the contact area between the front portion of the front load member 18 and the main cross member 31 can be relatively increased, and thus the front portion of the front load member 18 can be more firmly fixed to the main cross member 31. The pair of rear extension portions 18b may be symmetrically disposed at the rear portion of the front load member 18 such that the contact area between the rear portion of the front load member 18 and the end cross member 32 can be relatively increased, and thus the rear portion of the front load member 18 can be more firmly fixed to the end cross member 32.

[0096] Referring to Figure 5 and Figure 6, the middle frame 11 may further include a pair of side longitudinal members 36a and 36b symmetrically disposed on both sides of the front load member 18, and the pair of side longitudinal members 36a and 36b may be configured to connect the main cross member 31 and the end cross member 32. Each of the side longitudinal members 36a and 36b may extend in the longitudinal direction of the vehicle. The pair of side longitudinal members 36a and 36b may include a first side longitudinal member 36a facing the left side of the vehicle and a second side longitudinal member 36b facing the right side of the vehicle. The first side longitudinal member 36a may be aligned with the first diagonal member 35a, while the second side longitudinal member 36b may be aligned with the second diagonal member 35b.

[0097] Referring to Figure 5 and Figure 6 , a vehicle floor frame according to another exemplary embodiment of the present invention may include a rear load member 19 configured to transfer a load from a connection unit (a pair of structural members 13 and 14 and a reinforcing member 15) to the rear frame 12. One rear load member 19 may be configured to connect the main cross member 41 and the end cross member 42. The rear load member 19 may extend along the central longitudinal axis of the vehicle floor frame, and the rear load member 19 may be aligned with the pair of structural members 13 and 14 and the reinforcing member 15. The front end of the rear load member 19 may be fixed to the central portion of the end cross member 42 using fasteners, welding, etc., and the rear end of the rear load member 19 may be fixed to the central portion of the main cross member 41 using fasteners, welding, etc.

[0098] Referring to Figure 7 , the rear load member 19 may include a pair of front extension portions 19a symmetrically disposed at its front portion and a pair of rear extension portions 19b symmetrically disposed at its rear portion. The pair of front extension portions 19a may be symmetrically disposed at the front portion of the rear load member 19 such that the contact area between the front portion of the rear load member 9 and the end cross member 42 can be relatively increased, and thus the front portion of the rear load member 19 can be more firmly fixed to the end cross member 42. The pair of rear extension portions 19b may be symmetrically disposed at the rear portion of the rear load member 19 such that the contact area between the rear portion of the rear load member 19 and the main cross member 41 can be relatively increased, and thus the rear portion of the rear load member 19 can be more firmly fixed to the main cross member 41.

[0099] Referring to Figure 5 and Figure 6 , a pair of side longitudinal members 45a and 45b may be configured to connect the main cross member 41 and the end cross member 42. The pair of side longitudinal members 45a and 45b may be symmetrically disposed on the left and right sides of the rear load member 19. Each of the side longitudinal members 45a and 45b may extend in the longitudinal direction of the vehicle.

[0100] Referring to Figure 8, the torsional load applied to the middle frame 11 can be transmitted to the main cross beam 31 through a pair of diagonal members 35a and 35b, and the torsional load can be transmitted from the main cross beam 31 to the connection unit (a pair of structural members 13 and 14 and the reinforcing member 15) through the front load member 18 and a pair of side longitudinal members 36a and 36b. The load applied to the connection unit (a pair of structural members 13 and 14 and the reinforcing member 15) can be evenly distributed in three directions through the rear load member 19 and a pair of side longitudinal members 45a and 45b and transmitted to the rear frame 12.

[0101] As described above, a pair of structural members 13 and 14 and the reinforcing member 15 can be connected to the middle frame 11 through a front load member 18, and a pair of structural members 13 and 14 and the reinforcing member 15 can be connected to the rear frame 12 through a rear load member 19, so that the load can be evenly distributed through a front load member 18, a pair of side longitudinal members 36a and 36b, a pair of structural members 13 and 14, the reinforcing member 15, a rear load member 19, and a pair of side longitudinal members 45a and 45b. Therefore, compared with the stress generated in the vehicle floor frame of the related art, the stress generated in the vehicle floor frame according to the exemplary embodiment of the present invention can be reduced by about 31%.

[0102] Other elements / configurations of the vehicle floor frame in this exemplary embodiment can be the same as or similar to those shown in Figures 1 to 4 those.

[0103] As described above, the vehicle floor frame according to the exemplary embodiment of the present invention can be designed to have a connection unit that directly connects the middle frame and the rear frame along the central longitudinal axis of the vehicle floor frame, so that the stiffness of the vehicle floor frame can be improved. A pair of support frames can be respectively connected to a pair of structural members, so that a pair of ramps can be respectively mounted on the pair of support frames.

[0104] According to the exemplary embodiment of the present invention, the front part of the connection unit can be connected to the middle frame through the front load member, and the rear part of the connection unit can be connected to the rear frame through the rear load member, so that the load can be evenly distributed through the front load member, the connection unit, and the rear load member, and therefore, compared with the stress generated in the vehicle floor frame of the related art, the stress generated in the vehicle floor frame can be significantly reduced.

[0105] Although the present invention has been described above with reference to the exemplary embodiments and the drawings, the present invention is not limited thereto. Those skilled in the art can obviously make various changes and modifications to the present invention without departing from the spirit and scope of the present invention provided by the following claims.

Claims

1. A vehicle floor frame, comprising: mid-frame; a rear frame disposed behind the middle frame; a connecting unit connecting the middle frame and the rear frame; a pair of support frames disposed on both sides of the connection unit between the middle frame and the rear frame; a front load member connecting a front portion of the connection unit and the middle frame; and A rear load member connects a rear portion of the connection unit and the rear frame.

2. The vehicle floor frame according to claim 1, wherein: The connection unit includes a pair of structural members aligned with a central longitudinal axis of the middle frame and a central longitudinal axis of the rear frame.

3. The vehicle floor frame according to claim 2, wherein: The connection unit further includes a reinforcement member interposed between the pair of structural members.

4. The vehicle floor frame according to claim 2, wherein: A pair of support frames are respectively connected to the pair of structural members.

5. The vehicle floor frame according to claim 2, wherein: The middle frame includes a main cross beam and an end cross beam arranged behind the main cross beam; The front end of each structural member is fixed to the central portion of the end cross beam of the mid-frame.

6. The vehicle floor frame according to claim 5, wherein: Two front load members connect the main cross beam of the middle frame and the end cross beams of the middle frame; The rear ends of the two front load members are aligned with the front ends of the pair of structural members.

7. The vehicle floor frame according to claim 5, wherein: a front load member connecting the main cross beam of the mid-frame and the end cross beams of the mid-frame; The front end of the front load member is fixed to the central portion of the main cross beam of the middle frame; The rear end of the front load member is fixed to the central portion of the end cross member of the center frame.

8. The vehicle floor frame according to claim 7, wherein: The front load member comprises: a pair of front extensions symmetrically disposed at the front of the front load member; and A pair of rear extensions are symmetrically disposed at the rear of the front load member.

9. A vehicle floor frame, comprising: a middle frame, comprising a main crossbeam and an end crossbeam disposed behind the main crossbeam; a rear frame, which is arranged behind the middle frame and includes a main crossbeam and an end crossbeam arranged in front of the main crossbeam; a connecting unit connecting the middle frame and the rear frame, wherein the connecting unit includes a pair of structural members aligned with a central longitudinal axis of the middle frame and a central longitudinal axis of the rear frame, a front end of each structural member being fixed to a central portion of an end cross beam of the middle frame, and a rear end of each structural member being fixed to a central portion of an end cross beam of the rear frame; a pair of support frames disposed on both sides of the connection unit between the middle frame and the rear frame; a front load member connecting a front portion of the connection unit and the middle frame; and A rear load member connects a rear portion of the connection unit and the rear frame.

10. The vehicle floor frame according to claim 9, wherein: three rear load members connecting the main cross beam of the rear frame and the end cross beams of the rear frame; The front ends of the three rear load members are aligned with the rear ends of the pair of structural members.

11. The vehicle floor frame according to claim 9, wherein: a rear load member connecting the main cross beam of the rear frame and the end cross beams of the rear frame; The front end of the rear load member is fixed to the central portion of the end cross beam of the rear frame; The rear end of the rear load member is fixed to a central portion of the main cross beam of the rear frame.

12. The vehicle floor frame according to claim 11, wherein: The rear load member comprises: a pair of front extensions symmetrically disposed at the front of the rear load member; and A pair of rear extensions are symmetrically disposed at the rear of the rear load member.

13. The vehicle floor frame according to claim 9, wherein: The cross-sectional area of ​​each structural member is larger than the cross-sectional area of ​​the end beam of the middle frame and the cross-sectional area of ​​the end beam of the rear frame.

14. The vehicle floor frame according to claim 9, wherein: Each structural member is thicker than the end cross beams of the mid-frame and the end cross beams of the rear frame.

15. The vehicle floor frame according to claim 14, wherein: The top surface of the structural member is flush with the top surface of the end cross beam of the middle frame and the top surface of the end cross beam of the rear frame; The bottom surface of the structural member is located at a position lower than the bottom surface of the end cross beam of the middle frame and the bottom surface of the end cross beam of the rear frame.

16. The vehicle floor frame according to claim 15, further comprising a front reinforcement member fixed to a bottom surface of an end cross member of the center frame, wherein The front reinforcement is aligned with a front end of each structural member of a pair of structural members.

17. The vehicle floor frame according to claim 16, wherein: A bottom surface of the front reinforcement is flush with a bottom surface of each of the pair of structural members.

18. The vehicle floor frame according to claim 15, further comprising a rear reinforcement member fixed to a bottom surface of an end cross member of the rear frame, wherein The rear reinforcement is aligned with a rear end of each structural member of a pair of structural members.

19. The vehicle floor frame according to claim 18, wherein: A bottom surface of the rear reinforcement is flush with a bottom surface of each of the pair of structural members.

20. A vehicle floor frame, comprising: a middle frame, comprising a main crossbeam and an end crossbeam disposed behind the main crossbeam; a rear frame disposed behind the middle frame; A connecting unit connecting the middle frame and the rear frame, wherein the connecting unit comprises: a pair of structural members aligned with the central longitudinal axis of the mid-frame and the central longitudinal axis of the rear frame, wherein a front end of each structural member is secured to a central portion of an end cross member of the mid-frame; and a reinforcing member interposed between a pair of structural members; a pair of supporting frames disposed between the middle frame and the rear frame on both sides of the connecting unit, wherein the pair of supporting frames are respectively connected to a pair of structural members; A front load member connecting the main cross beam of the middle frame and the end cross beam of the middle frame, wherein the front load member comprises: a pair of front extensions symmetrically disposed at the front of the front load member; and a pair of rear extensions symmetrically disposed at the rear of the front load member; and A rear load member connects a rear portion of the connection unit and the rear frame.

Images