Vehicle body frame using assembly-integrated rear lower portion

Abstract

A vehicle body frame using an assembly-integrated rear lower portion includes a main body frame having a first side end and a second side end and having a predetermined length, a front-rear connecting member connecting a side sill at the first side end and connecting a rear side member at the second side end, a bushing mounting member coupling a bushing to the first side end, and a joint type torsion beam bridge mounting member coupled to at least one of a joint type torsion beam bridge, a chassis spring, or a shock absorber, the at least one of the joint type torsion beam bridge, the chassis spring, or the shock absorber being engaged with the second side end.

Description

Technical Field

[0001] An exemplary embodiment of the present invention relates to a vehicle body frame. Background Technology

[0002] Typically, the lower rear section (or lower rear component) of a vehicle forms the rear connection structure of the vehicle body frame to absorb the impact of a rear collision and safely protect the vehicle.

[0003] To this end, one side of the lower rear section includes multiple reinforcing members that project forward / backward and bend to increase rigidity, and the rear side member, spring seat / subframe bracket and rear side plate are applied to one side of the lower rear section, so that the relevant components, including the bracket, are integrated together by a bonding process to form one side of the lower rear section.

[0004] In particular, the lower rear section also provides a joint structure for the rear wheel suspension, thereby providing a welded structure of support members on one side of the spring seat and the side surface of the lower rear section using multiple reinforcing members.

[0005] However, since the rear lower section is formed as a combination of multiple components using a rear lower plate and multiple reinforcing members, it may result in a complex structure and increased weight, and defects may occur in the welded parts.

[0006] For example, the lower rear section consists of approximately ten components, eight of which serve as rigid reinforcement members. Paradoxically, this large number of reinforcement members increases weight and material costs, and necessitates the use of welding to form the connection structure between the plates, which also leads to a reduction in the rigidity of the lower rear section.

[0007] In particular, when the lower rear section is mounted on the rear wheel suspension, there is an offset between the suspension mounting structure and the side beam components and / or rear side members, which are major components of the body frame. This offset inevitably makes the lower rear section more vulnerable to damage. Summary of the Invention

[0008] Exemplary embodiments of the present invention relate to a vehicle body frame. A specific embodiment relates to a vehicle body frame in which the lower rear section, employing a rear-connection structure, is manufactured by die casting in a component-integrated manner, thereby significantly reducing the number of parts and facilitating modification according to the design intent of a purpose-built vehicle (PBV).

[0009] The embodiments of the present invention are directed to a vehicle frame in which, due to structural simplification, weight reduction and material cost reduction are achieved, enabling the entire rear connection structure of the side beams and rear side members to be formed in a component-integrated structure using die casting, without the need for the application of multiple reinforcing materials. In particular, the rigidity of the coupled torsion beam axle (CTBA) is guaranteed in the CTBA mounting structure using the rear lower section, and a component-integrated rear lower section is applied, wherein, since the formability of die casting depends on the size of the rear lower section, the component-integrated rear lower section is easily modified according to the design intent of a special purpose vehicle (PBV).

[0010] Other features and advantages of the embodiments of the present invention will be understood from the following description and will become clear with reference to specific embodiments of the invention. Similarly, it will be apparent to those skilled in the art that the features and advantages of the present invention can be achieved by the claimed methods or combinations thereof.

[0011] According to an embodiment of the present invention, a component-integrated rear substructure is provided, comprising: a main frame, a bushing mounting member, and a coupling torsion beam bridge mounting member. The main frame includes an end on one side and an end on the other side and has a predetermined length. The main frame is integrated with a front-rear connecting member, which is configured to connect a side beam at one end and a rear side member at the other end. In the bushing mounting member, a bushing is connected to one end. The coupling torsion beam bridge mounting member is connected to one or more of a coupling torsion beam bridge, a chassis spring, and a shock absorber, and one or more of the coupling torsion beam bridge, chassis spring, and shock absorber are engaged with the other end.

[0012] As an exemplary implementation, the main frame can be made of aluminum and can be formed by die casting, so that the front-rear connecting member, the bushing mounting member and the joint torsion beam bridge mounting member can be integrated thereon.

[0013] As an exemplary implementation, the main frame may have a height difference between one end and the other end to form a rear lower ground clearance, and the main frame may form an "H" shaped cross-section structure.

[0014] As an exemplary embodiment, the front-rear connection member may include: a central connector and a rear connector, wherein the side beam is placed from the top in an open space portion of an upper surface extending from one end of the central connector; the rear connector extends from the other end into an open space, and in the rear connector, the rear side member is fitted into the upper surface of the open space.

[0015] As an exemplary embodiment, the rear connector may have an inner wall formed in the lateral direction relative to the upper surface, and the rear member is fitted to the inner wall such that the end face of the rear member is pressed against it.

[0016] As an exemplary embodiment, the bushing mounting member may include a bushing mounting hole drilled in a central connector extending from one end to form an open space on the upper surface, such that the side beam can be mounted from the top.

[0017] As an exemplary embodiment, the joint torsion beam bridge mounting components may include: a longitudinal arm connector, a spring seat, and a shock absorber connector. The longitudinal arm connector protrudes from one end to form a lateral open space, such that a portion of the joint torsion beam bridge is fitted into the lateral portion. The spring seat protrudes from the lower surface of the other end to form a lower surface open space, such that the upper part of the chassis spring is fitted from below. The shock absorber connector forms a lateral open space on the side surface of the other end, such that the upper part of the shock absorber is fitted into the lateral portion.

[0018] As an exemplary embodiment, a rear under-hole may be drilled in the longitudinal arm connector for threaded engagement with a bolt and a portion of the joint torsion beam bridge.

[0019] As an exemplary implementation, the side beam can be formed as an extruded material structure.

[0020] According to another embodiment of the present invention, a vehicle body frame is provided, comprising: a side beam, a rear side member, and a rear lower portion, wherein the side beam forms a frame for the middle portion of the vehicle and expands the battery space in which the battery is installed; the rear side member forms a frame for the rear portion of the vehicle; the rear lower portion includes a main frame of a predetermined length, the main frame having a height difference formed by the ground clearance of the rear lower portion, the connection between the side beam and the rear side member is formed by a front-rear connection member, the engagement between the side beam and the bushing is formed by a bushing mounting member, and the engagement of the rear wheel suspension is formed by an engagement torsion beam axle mounting member.

[0021] As an exemplary implementation, the lower rear section may be made of aluminum and may be die-cast, allowing the front-rear connection member, the bushing mounting member, and the joint torsion beam bridge mounting member to be integrated with the main frame.

[0022] As an exemplary implementation, the front-rear connecting member can be used to fix the side beam and the rear member using a joining member.

[0023] As an exemplary implementation, the joining member and the side beam, as well as the joining member and the rear member, are fixed by a flow drill screw (FDS) method.

[0024] As an exemplary embodiment, the front-rear connection member may include: a central connector and a rear connector, wherein in the connection portion of the side beam, a portion of the side beam is placed from the top in an open space portion of the upper surface of the central connector extending from the main frame; and in the rear connector, the main frame extends into an open space such that a portion of the rear member is fitted onto the upper surface of the open space in the connection portion of the rear member.

[0025] As an exemplary implementation, the end of the rear member can be in close contact with the inner wall of the rear connector.

[0026] As an exemplary implementation, the space of the side beam can be divided by a partition rib, which is fixed to the central connector at the lower rear by a flow drill screw method. The central connector can extend from one end to form an open space on the upper surface, allowing the side beam to be placed from the top.

[0027] As an exemplary implementation, the rear component can be formed into an open rectangular cross-section structure or a closed rectangular cross-section structure.

[0028] As an exemplary embodiment, the bushing mounting member may include a bushing mounting hole fixed by a bushing shaft in the bushing fitted therein state. In the connecting portion of the side beam, the bushing mounting hole may be formed by drilling in a central connector extending from the main frame into an upper surface open space, a portion of the side beam being placed in the upper surface open space from the top.

[0029] As an exemplary embodiment, the rear wheel suspension may include a coupled torsion beam axle, chassis springs, and shock absorbers, wherein the coupled torsion beam axle mounting member may engage with one or more of the coupled torsion beam axle, chassis springs, or shock absorbers.

[0030] As an exemplary embodiment, the mounting components of the joint torsion beam bridge may include: a longitudinal arm connector, a spring seat, and a shock absorber connector. The longitudinal arm connector protrudes from the side surface of the main frame to form a lateral open space. In the connection portion of the side beam, the longitudinal arm of the joint torsion beam bridge is fitted into the lateral open space on the side. The spring seat protrudes from the lower surface of the main frame to form a lower surface open space. In the connection portion of the rear component, the upper part of the chassis spring located in the spring mounting portion of the joint torsion beam bridge is fitted into the lower surface open space from below. The shock absorber connector is recessed in the side surface of one side of the main frame to form a lateral open space. In the connection portion of the rear component, the upper part of the shock absorber is fitted into the lateral open space on the side.

[0031] As an exemplary embodiment, the trailing arm connector may have a rear lower hole, which is threadedly connected to a bolt fixed to the trailing arm. The spring seat may have a cup-shaped structure that surrounds the outer diameter of a spring cup cover disposed on the upper part of the chassis spring.

[0032] As an exemplary implementation, the side beam may include a left beam and a right beam, and the vehicle width, including the battery space, may be configured to be the same as the spacing between the left beam and the right beam.

[0033] As an exemplary implementation, the left beam and the right beam may be connected by a central extruded material spanning the width of the vehicle. Attached Figure Description

[0034] Figure 1 This is a schematic diagram illustrating the structure of the vehicle body frame with integrated components in the lower part according to an embodiment of the present invention.

[0035] Figure 2 This is a perspective view showing the lower part of the component integrated according to an embodiment of the present invention, which is manufactured by forming aluminum using die casting and constitutes a side connecting member.

[0036] Figure 3 This is a schematic diagram illustrating the state in which the vehicle frame and the rear wheel suspension are assembled together using a component-integrated lower section according to an embodiment of the present invention.

[0037] Figure 4 This is a cross-sectional view showing a rear connection structure of a vehicle body frame formed by component integration at the lower rear section according to an embodiment of the present invention.

[0038] Figure 5 This is a schematic diagram illustrating an example of a vehicle frame according to an embodiment of the present invention, which expands the battery mounting space by forming a bushing mounting structure at the lower rear of the component integrated.

[0039] Figure 6 This is a schematic diagram illustrating an example of a vehicle interior space expanded by a component-integrated rear lower section forming a coupled torsion beam axle (CTBA) mounting structure according to an embodiment of the present invention.

[0040] Figure 7 This is a cross-sectional perspective view of the assembly of the chassis springs of the rear wheel suspension using a component-integrated lower rear spring seat according to an embodiment of the present invention. Detailed Implementation

[0041] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. These embodiments are examples of the invention, and those skilled in the art may implement the invention in various other forms, so that the invention is not limited to these embodiments.

[0042] refer to Figure 1 The vehicle frame 1 includes a side connecting member 10 consisting of a side beam 30 and a rear side member 40. In this case, in the vehicle frame 1, the front side member (not shown) is connected to the front of the side beam 30.

[0043] Specifically, in the side connecting member 10, the lower rear part 20 connects the side beam 30 to the rear side member 40, and the left / right side beams 30A and 30B are fixed using the central extruded material 50.

[0044] For example, the lower rear portion 20 forms a front-to-rear connection member (or the entire rear connection structure) that connects the side beam 30 to the rear side member 40.

[0045] Therefore, the lower rear part 20 is composed of a left lower rear part and a right lower rear part. The left lower rear part connects the left side beam 30A of the side beam 30 to the left rear side member 40A of the rear member 40, and the right lower rear part connects the right side beam 30B of the side beam 30 to the right rear side member 40B of the rear member 40.

[0046] In particular, the left and right rear lower portions of the rear lower portion 20 are both made of aluminum by die casting. Therefore, the rear lower portion 20 is characterized in that the component-integrated rear lower portion 20 consists of a single part without the application of separate reinforcing members.

[0047] For example, the side beam 30 consists of a left beam 30A and a right beam 30B, and the left beam 30A and the right beam 30B are connected by a central extruded material 50. In this case, the left beam 30A and the right beam 30B form left / right lower side surfaces in the middle part of the vehicle and are spaced apart from each other to form a battery space width Lb. The central extruded material 50 spans the battery space width Lb to connect the left / right beams 30A and 30B, and the central extruded material 50 is configured as two or more central extruded materials spaced apart from each other by a pitch.

[0048] Specifically, each of the left beam 30A and the right beam 30B can be configured as an extruded material structure, such as the central extruded material 50, to have enhanced rigidity and durability. In this case, the extruded material is made of aluminum.

[0049] Therefore, the side beams 30 form the central frame of the vehicle frame 1 with an integrated structure of extruded material.

[0050] Therefore, the end of the left side beam 30A side of the side beam 30 is connected to the connecting member 60 at the lower left rear part 20 (see...). Figure 4 Assembled, the end of the right side beam 30B of the side beam 30 is joined to the lower right rear part 20 by the connecting member 60 (see...). Figure 4 Assembly.

[0051] For example, the rear member 40 is composed of a left rear member 40A and a right rear member 40B, which form left / right lower surfaces in the rear portion of the vehicle. In this case, one end of the left / right rear members 40A and 40B is connected to the rear bumper beam 6, which is an assembly of the rear bumper (not shown).

[0052] Specifically, a cross-section is formed at each of the left rear member 40A and the right rear member 40B, the cross-section having a hollow internal space formed by welding two plates. In this case, each of the left / right rear members 40A and 40B is made of aluminum.

[0053] Furthermore, the rear member 40 is formed as The open rectangular cross-sectional shape or the closed rectangular cross-sectional shape of "□" (see...) Figure 4 Furthermore, the rear member 40 is composed of a left rear member 40A and a right rear member 40B.

[0054] Specifically, the end of the left rear member 40A side of the rear member 40 connects with the connecting member 60 at the left rear lower part 20 (see...). Figure 4 Assembled, the end of the right rear member 40B of the rear member 40 is joined to the connecting member 60 at the right rear lower part 20 (see...). Figure 4 Assembly.

[0055] Meanwhile, reference Figure 2 The rear lower section 20 is composed of a slightly curved main frame 21, with front-rear connecting members, bushing mounting members (or bushing mounting structures) and coupled torsion beam axle (CTBA) mounting members (or CTBA mounting structures) integrated on the main frame 21. Therefore, the rear lower section 20 is characterized as a component-integrated rear lower section 20.

[0056] For example, the main frame 21 consists of a left vertical main body 21B and a right vertical main body 21C. The left vertical main body 21B and the right vertical main body 21C are perpendicular to the horizontal main body 21A to form an "H" cross-section structure. The difference in height between one side and the other side of the main frame 21 creates a rear lower ground clearance H, making it easy to mount the main frame 21 on the chassis spring 300 and shock absorber 400 of the rear wheel suspension. In this case, the position of the left vertical main body 21B can be defined as the position facing the interior space of the vehicle, and the position of the right vertical main body 21C can be defined as the position facing the exterior space of the vehicle.

[0057] Specifically, in the main frame 21, the upper position b of the horizontal main body 21A is positioned higher than the lower position B relative to the left / right vertical main bodies 21B and 21C, and since the lower width A of the left / right vertical main bodies 21B and 21C is greater than the upper width a, the "H" cross-section structure is formed into a trapezoidal shape.

[0058] For example, the front-rear connecting members are integratedly formed at one end of the main frame 21 and include a central connector 21-1 and a rear connector 21-2, the central connector 21-1 extending horizontally and the rear connector 21-2 being integratedly formed at the other end of the main frame 21 and extending horizontally.

[0059] For example, the bushing mounting member includes a bushing mounting hole 23 drilled in the central connector 21-1. In this case, the bushing mounting hole 23 is formed as a circle.

[0060] Specifically, the CTBA mounting components include: a trailing arm connector 25, a spring seat 27, and a shock absorber connector 29. The trailing arm connector 25 is formed to protrude horizontally from the side surface of the main frame 21 and is spaced apart from the central connector 21-1 on one side of the main frame 21. The spring seat 27 is formed to protrude vertically from the lower surface of the main frame 21 and is spaced apart from the rear connector 21-2 on the other side of the main frame 21. The shock absorber connector 29 is formed in the space on the side surface of one side of the main frame 21 and is spaced apart from the rear connector 21-2 on the other side of the main frame 21.

[0061] For example, the trailing arm connector 25 is formed by left / right flanges projecting horizontally from the left / right vertical bodies 21B and 21C of the main frame 21, and surrounds a portion of the trailing arm 200A of the CTBA200 (see...). Figure 6 The left / right flanges are drilled to form an internal thread in the rear lower hole 25A, which is used to engage with bolt 200B (see...). Figure 6 Threaded connection.

[0062] For example, the spring seat 27 is formed by a cup-shaped extension of the left / right flanges that project vertically from the left / right vertical bodies 21B and 21C of the main frame 21 (see...). Figure 7 The cup shape surrounds and houses the end of the chassis spring 300 that is connected to the spring cup lid 300A.

[0063] For example, the shock absorber connector 29 is configured such that the left vertical body 21B of the main frame 21 is pushed into and inserted into the horizontal body 21A that forms the portion of the spring seat 27, thereby forming a side-opening structure, and the upper part of the shock absorber 400 (see...) Figure 6 It is located in the side-opening structure.

[0064] at the same time, Figures 3 to 7 An example is shown of mounting the rear wheel suspension to the side connection member 10 using the component-integrated rear lower section 20 in the body frame 1.

[0065] refer to Figure 3 The vehicle frame 1 includes a side connecting member 10, wherein the rear lower part 20 connects the side beam 30 to the rear side member 40.

[0066] Specifically, the side connecting member 10 uses the front-rear connecting member of the rear lower part 20 to fix the side beam 30 and the rear side member 40, uses the bushing mounting member to fix the bushing 100 and the side beam 30 through the bushing shaft 100A, and uses the CTBA mounting member to fix the CTBA 200, the chassis spring 300 and the shock absorber 400, which are components of the rear wheel suspension.

[0067] In particular, since the rear lower section 20 is manufactured by injection molding aluminum using a die casting method (i.e., low-pressure die casting), the rear lower section 20 is easy to adjust relative to the rear lower section specifications (i.e., size and length), and the ease of changing the rear lower section specifications meets the design characteristics of a purpose-built vehicle (PBV), which requires changing the length according to the vehicle's purpose.

[0068] refer to Figure 2 and Figure 4The front-to-rear connection is achieved using a central connector 21-1 and a rear connector 21-2 formed on the main frame 21 of the lower rear 20.

[0069] For example, the central connector 21-1 of the lower rear portion 20 faces upward and positions the side beam 30 within an open space on the upper surface extending from one end of the lower rear portion 20. Simultaneously, the rear connector 21-2 of the lower rear portion 20 extends from the other end of the lower rear portion 20... The open space is shaped such that the rear component 40 is assembled and placed in the upper surface of the open space and fixed to the upper surface of the open space.

[0070] Furthermore, the central connector 21-1 is fixed to the side beam 30, and the rear connector 21-2 is fixed to the rear member 40 using a connecting member 60. In this case, screws (or bolts) are used as connecting members 60, and the screws (or bolts) are fixed to the side beam 30 and the rear member 40 by a flow drill screw (FDS) method that is capable of unidirectionally joining different materials.

[0071] For example, in the joining member 60, as shown in sections AA and BB at the central connector 21-1, multiple screws (or bolts) pass through the surface contact portion via the FDS method, wherein the wall surface of the central connector 21-1 contacts the wall surface of the side beam 30, thereby fixing the central connector 21-1 to the side beam 30. In this case, the space of the side beam 30 can be divided by multiple partition ribs 31, giving the side beam 30 greater rigidity and durability.

[0072] For example, in the joining member 60, as shown in section CC at the rear connector 21-2, a plurality of screws (or bolts) pass through the surface contact portion by means of the FDS method, wherein the wall surface of the rear connector 21-2 contacts the wall surface of the rear member 40, thereby fixing the rear connector 21-2 to the rear member 40.

[0073] Specifically, as shown in section AA with the side beam 30 mounted at the top, the open structure of the upper surface of the central connector 21-1 is in close contact with the sidewall of the central connector 21-1 to maximize the supporting rigidity against external forces applied along the length direction (i.e., the horizontal direction) of the lower rear portion 20. In this case, close contact means having welded portions in surface contact.

[0074] Furthermore, in the rear connector 21-2 In the upper open space of the shape, the rear member 40 is assembled into the upper surface of the open space, as shown in the cross section DD in this upper surface assembly state. The end Z of the rear member 40 is in close contact with the inner wall of the rear connector 21-2 in the internal space of the rear connector 21-2, thereby maximizing the support rigidity against external forces applied along the length direction (i.e., along the horizontal direction) of the lower rear 20.

[0075] refer to Figure 5 The bushing mounting component is assembled by using bushing mounting holes 23 to assemble the bushing 100 with the central connector 21-1 formed in the main body frame 21 of the rear lower part 20.

[0076] For example, bushing 100 is fitted into bushing mounting hole 23, bushing shaft 100A passes through shaft hole of bushing 100 and across partition rib 31 of side beam 30, and is secured by bushing cap (or bushing cap nut) connected to end of bushing shaft 100A.

[0077] Therefore, as shown in section EE, the bushing width Lc of bushing 100 is included in the side beam width (s / beam width) La of side beam 30, and the overlapping structure of bushing 100 and side beam 30 can be obtained by removing the bushing width Lc from the vehicle width L formed by left / right side beams 30A and 30B.

[0078] Therefore, as shown in section FF, unlike the related technology that excludes the bushing width Lc and s / beam width La of each left / right beam from the vehicle width L formed by the left / right beams 30A and 30B in the utilization of the battery space width Lb, in the body frame 1, only the s / beam width La of each left / right beam is excluded, thereby expanding the battery space width Lb.

[0079] Therefore, due to the increased size of the battery space width Lb compared to related technologies, the high-voltage battery 500 mounted on the vehicle frame 1 can increase its battery capacity under the same conditions compared to related technologies.

[0080] refer to Figure 6 The CTBA mounting components are assembled by using trailing arm connectors 25, spring seats 27 and shock absorber connectors 29 formed on the main frame 21 of the lower rear 20 to assemble the CTBA200, chassis springs 300 and shock absorbers 400 of the rear wheel suspension.

[0081] For example, CTBA200 is formed approximately on the left / right surface of a straight shaft. The spring mounting portion 200C is shaped, and the longitudinal arm 200A formed in the curved portion of the spring mounting portion 200C is assembled into the lateral open space formed in the longitudinal arm connector 25 in the rear lower portion 20.

[0082] Then, as shown in section GG, bolt 200B is fixed through rear lower hole 25A of longitudinal arm connector 25 and threadedly engaged with pin hole of longitudinal arm 200A, thereby assembling and integrating CTBA200 with rear lower part 20.

[0083] For example, with the lower part of the shock absorber 400 engaged with the side surface of the CTBA200, the upper part of the shock absorber 400 is placed in a laterally open space in the shock absorber connector 29 formed in the lower rear part 20.

[0084] Then, as shown in section HH, the upper part of the shock absorber 400 is fixed by mounting pins or the like in the space of the shock absorber connector 29, thereby assembling and integrating the chassis shock absorber 400 with the rear lower part 20.

[0085] For example, with the lower part of the chassis spring 300 placed in the spring mounting portion 200C of the CTBA200, the upper part of the chassis spring 300 to which the spring cup cover 300A is connected is placed in the space formed in the spring seat 27 of the rear lower portion 20.

[0086] Then, as shown in section II, the upper part of the chassis spring 300 is surrounded and placed in the cup-shaped structure of the spring seat 27 together with the spring cup cover 300A, thereby assembling and integrating the chassis spring 300 with the rear lower part 20.

[0087] refer to Figure 7 With the chassis spring 300 positioned between the spring mounting portion 200C of the CTBA200 and the spring seat 27 of the rear lower portion 20, the cup-shaped structure of the spring seat 27 hangs down to connect to the outer diameter of the spring cup cover 300A.

[0088] As described above, in the side connecting member 10 applied to the vehicle frame 1 according to an embodiment of the present invention, the connecting portion formed by connecting the side beam 30 of the frame constituting the middle part of the vehicle and the rear side member 40 of the frame constituting the rear part of the vehicle is formed by the main frame 21, the main frame 21 having a predetermined length with a height difference formed by the rear lower ground clearance H, and the connecting portion including a rear lower part 20, in which the front-rear connecting member (i.e., the central connecting member 21-1 and the rear connecting member 21-2), the bushing mounting member (i.e., the central connecting member 21-1 and the bushing mounting hole 23), and the CTBA mounting member (i.e., the trailing arm connecting member 25, the spring seat 27 and the shock absorber connecting member 29) are integrated with the main frame 21, wherein the front-rear connecting member fixes the side beam 30 and the rear side member 40, which are formed as the battery space width Lb, the bushing mounting member engages with the bushing 100, and the rear wheel suspension is mounted on the CTBA mounting member.

[0089] Therefore, the side connecting member 10 is die-cast into a component-integrated rear lower section structure. This simplifies the structure, reduces weight and material costs, and ensures the rigidity of the CTBA200. In particular, since the formability of die casting depends on the dimensions of the rear lower section 20, it is easily modified according to the design intent of the PBV.

[0090] The component-integrated rear lower body frame that applies the embodiment of the present invention achieves the following functions and effects.

[0091] First, the lower rear section is manufactured by die casting in a component-integrated structure and is used in the side beams and rear components of the body frame. Compared with the rear connection structure, the weight can be reduced due to the simplified structure.

[0092] Secondly, the integrated lower rear suspension and the joint torsion beam axle (CTBA) and chassis springs are directly joined in the integrated CTBA mounting structure, which ensures the robustness of the chassis mounting rigidity, which is the main pathway for driving-induced vibrations to transmit driving noise to the vehicle body, thus improving driving noise reduction performance.

[0093] Third, the integrated rear lower section houses the rear suspension shock absorbers within the integrated CTBA mounting structure, thereby ensuring a wider interior space by moving the shock absorbers as much as possible.

[0094] Fourth, the integrated lower part of the component can join the bushing to the side beam in the integrated bushing mounting structure, thereby eliminating the bushing space formed between the side beams in related technologies. Therefore, compared with related technologies, the space of the high-voltage battery can be expanded, thereby ensuring a larger battery capacity.

[0095] Fifth, the lower rear section is manufactured by die casting in a component-integrated structure and applied to the rear connection structure of the vehicle frame. This eliminates the need for some reinforcing materials used in related technologies, thereby reducing the material and mold costs of manufacturing individual products and reducing the cost and weight of fixture components for individual product components.

[0096] Sixth, the component-integrated rear underbody is manufactured by die casting, which makes it easy to adjust according to the rear underbody specifications (i.e., size and length), thus making it suitable for the design features of special purpose vehicles (PBVs) that require changes in length depending on the vehicle's purpose.

[0097] Although embodiments of the invention have been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and that the invention is not limited to the exemplary embodiments disclosed herein. Accordingly, it should be noted that such changes or modifications fall within the scope of the claims of the invention, which are defined by the appended claims.

Claims

1. A component-integrated rear lower section, comprising: The main frame has a first end and a second end and has a predetermined length; A front-to-rear connecting member, which connects to a side beam at the end of the first side and to a rear member at the end of the second side; A bushing mounting component that connects the bushing to the end of the first side; as well as A joint torsion beam bridge mounting component, which is connected to at least one of a joint torsion beam bridge, a chassis spring, or a shock absorber, wherein at least one of the joint torsion beam bridge, the chassis spring, or the shock absorber is engaged with an end on the second side. The front-rear connection member includes: a central connector, on which the side beam is placed from the top in an open space portion of the upper surface extending from the end of the first side; The side beam has a notch formed on the inner side of its end; The open space portion of the upper surface is a space portion that is open to the outside and upward, formed by the end wall, side wall and bottom wall of the central connector; The end of the side beam contacts the end wall of the central connector, and the inner side wall of the side beam contacts the side wall of the central connector. A receiving space is formed between the side wall of the central connector and the notch of the side beam; the bushing mounting member includes a bushing mounting hole, which is formed in the receiving space by drilling.

2. The component-integrated lower rear section according to claim 1, wherein, The main frame is made of aluminum and formed by die casting, and the front-rear connecting member, the bushing mounting member, and the joint torsion beam bridge mounting member are integrated thereon.

3. The component-integrated lower rear section according to claim 1, wherein, The main frame has a height difference between the end on the first side and the end on the second side to define the rear lower ground clearance.

4. The component-integrated lower rear section according to claim 1, wherein, The front-to-rear connecting member further includes: A rear connector extends from the end of the second side into an open space, and the rear member is fitted into the upper surface of the open space.

5. The component-integrated lower rear section according to claim 4, wherein, The rear connector has an inner wall formed in the transverse direction relative to the upper surface, and the rear component is assembled to the inner wall such that the end face of the rear component is pressed against it.

6. The component-integrated lower rear section according to claim 1, wherein, The bushing mounting hole is drilled in the central connector extending from the end of the first side to define an open space on the upper surface, allowing the side beam to be mounted from above.

7. The component-integrated lower rear section according to claim 1, wherein, The joint torsion beam bridge mounting components include: A longitudinal arm connector, which protrudes from the end of the first side to define a first lateral open space, such that a portion of the jointed torsion beam bridge is fitted at the first lateral portion; A spring seat, which protrudes from the lower surface of the end on the second side to define an open space on the lower surface, such that the upper portion of the chassis spring is assembled from below; and A shock absorber connector that defines a second lateral open space at the side surface of its end on the second side, such that the upper part of the shock absorber is fitted into the second lateral portion.

8. The component-integrated lower rear section according to claim 7, wherein, A rear under-hole is drilled in the longitudinal arm connector for threaded engagement with bolts and a portion of the joint torsion beam bridge.

9. The component-integrated lower rear section according to claim 1, wherein, The side beams are formed as extruded material structures.

10. The component-integrated lower rear section according to claim 1, wherein, The main frame consists of a horizontal main body, a left vertical main body, and a right vertical main body. The left and right vertical main bodies are perpendicular to the horizontal main body to form an "H" cross-section structure. The upper part of the horizontal main body is positioned higher than the lower part of the left and right vertical main bodies, and because the lower width of the left and right vertical main bodies is greater than the upper width, the "H" cross-section structure is formed into a trapezoidal shape.

11. A vehicle frame comprising: Side beams provide a frame for the middle section of the vehicle and expand the battery space in which the battery is installed; Rear side member, which provides the frame for the rear part of the vehicle; as well as The lower rear section includes a main frame of a predetermined length, the main frame having a height difference that defines the ground clearance of the lower rear section, the connection between the side beam and the rear side member is formed by a front-rear connection member, the joint between the side beam and the bushing is formed by a bushing mounting member, and the joint of the rear wheel suspension is formed by a joint torsion beam bridge mounting member. The front-to-rear connecting component includes: The central connector, in the connecting portion of the side beam, has a portion of the side beam placed from above in the open space portion of the upper surface of the central connector that extends from the main frame; The side beam has a notch formed on the inner side of its end; The open space portion of the upper surface is a space portion that is open to the outside and upward, formed by the end wall, side wall and bottom wall of the central connector; The end of the side beam contacts the end wall of the central connector, and the inner side wall of the side beam contacts the side wall of the central connector. A receiving space is formed between the side wall of the central connector and the notch of the side beam; the bushing mounting member includes a bushing mounting hole, which is formed in the receiving space by drilling.

12. The vehicle frame according to claim 11, wherein, The lower rear section is made of aluminum and formed by die casting, such that the front-rear connecting member, the bushing mounting member, and the joint torsion beam bridge mounting member are integrated thereon with the main frame.

13. The vehicle frame according to claim 11, wherein, The front-rear connecting member uses a coupling member to fix the side beam and the rear member.

14. The vehicle frame according to claim 13, wherein, The connecting member and the side beam, as well as the connecting member and the rear member, are fixed by a flow drill screw method.

15. The vehicle frame according to claim 13, wherein, The front-to-rear connecting member further includes: A rear connector in which the main frame extends into an open space, such that a portion of the rear member is fitted onto the upper surface of the open space in the connecting portion of the rear member.

16. The vehicle frame according to claim 15, wherein, The end of the rear component is in close contact with the inner wall of the rear connector.

17. The vehicle frame according to claim 13, wherein, The space of the side beam is divided by partition ribs. The rear component forms an open rectangular cross-section structure or a closed rectangular cross-section structure.

18. The vehicle frame according to claim 17, wherein, The partition rib is fixed to the central connector at the lower rear part by means of a flow drill screw. The central connector extends from the end of the first side to provide an open space on the upper surface, allowing the side beam to be placed from above.

19. The vehicle frame according to claim 11, wherein, The bushing mounting hole is fixed by the bushing shaft when the bushing is fitted inside. In the connecting portion of the side beam, the bushing mounting hole is formed by drilling a hole in a central connector that extends from the main frame into an open space on the upper surface, with a portion of the side beam placed above in the open space on the upper surface.

20. The vehicle frame according to claim 11, wherein, The rear suspension includes a coupled torsion beam axle, chassis springs, and shock absorbers. The joint torsion beam bridge mounting component is engaged with at least one of the joint torsion beam bridge, the chassis spring, or the shock absorber.

21. The vehicle frame according to claim 20, wherein, The joint torsion beam bridge mounting components include: A longitudinal arm connector, which protrudes from the side surface of the main frame to define a lateral open space, wherein the longitudinal arm of the joint torsion beam bridge is fitted into the lateral open space on the side in the connection portion of the side beam; A spring seat, protruding from the lower surface of the main frame to define a lower surface open space, wherein the upper portion of the chassis spring located in the spring mounting portion of the coupled torsion beam bridge is fitted from below into the lower surface open space in the connection portion of the rear member; and A shock absorber connector, recessed in the side surface of the first side of the main frame to define a lateral open space, wherein the upper part of the shock absorber is fitted into the lateral open space on the side in the connection portion of the rear member.

22. The vehicle frame according to claim 21, wherein, The longitudinal arm connector has a rear lower hole, which is threadedly connected to a bolt fixed to the longitudinal arm.

23. The vehicle frame according to claim 21, wherein, The spring seat has a cup-shaped structure, which surrounds the outer diameter of the spring cup cover disposed on the upper part of the chassis spring.

24. The vehicle frame according to claim 11, wherein, The side beams include a left side beam and a right side beam. The width of the vehicle, including the battery space, is the same as the spacing between the left and right beams.

25. The vehicle frame according to claim 24, wherein, The left and right beams are connected by a central extruded material spanning the width of the vehicle.

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