Rear frame connecting piece, installation structure of rear floor assembly and vehicle

Abstract

The present invention discloses a rear frame connecting member, which includes an aluminum alloy casting main body. A sill side beam connecting portion is arranged at the front of the aluminum alloy casting main body, and a rear longitudinal beam connecting portion is arranged at the rear. A first cavity is arranged inside the aluminum alloy casting main body, and a second cavity is arranged outside. A spring mounting point is arranged on the aluminum alloy casting main body. A first strengthening structure is arranged at a position above the spring mounting point corresponding to the first cavity, and a second strengthening structure is arranged at a position above the spring mounting point corresponding to the second cavity. The rear frame connecting member of the present invention can enhance the function integration degree, while meeting the requirements of vehicle lightweight, ensure the body structure stability, improve the vehicle driving performance, and ensure the riding safety and comfort of the internal passengers. The present invention also aims to provide a rear floor assembly mounting structure and a vehicle.

Description

Technical Field

[0001] The present invention relates to an automobile body structure, and particularly to a rear frame connecting member, an installation structure of a rear floor assembly, and an automobile. Background Art

[0002] The rear frame connecting member is a body part provided on the left and right sides of the rear floor assembly. The front and rear ends of the rear frame connecting member are respectively connected to the sill side beam and the rear longitudinal beam. Traditionally, the rear frame connecting member, the rear floor assembly, the sill side beam, and the rear longitudinal beam are usually pure steel welded structures. For each individual part, there are problems such as complex structural design, difficult to ensure stiffness, many welding processes, weak function integration, poor assembly accuracy, large body weight, and inability to simultaneously meet the improvement of body strength performance and the reduction of body weight.

[0003] CN217477413U discloses a rear floor longitudinal beam structure and an automobile. The rear floor longitudinal beam structure includes a longitudinal beam main body with an open side, and a longitudinal beam cover plate covering the open side, and the longitudinal beam main body has a front longitudinal beam section and a rear longitudinal beam section. Among them, the front longitudinal beam section includes a front upper plate and a front lower plate connected to each other, and the rear longitudinal beam section includes a rear upper plate and a rear lower plate connected to each other, and a rear anti-collision beam mounting plate connected to the end of the rear longitudinal beam section; a shock absorption spring mounting portion is provided at the bottom of the arched portion of the front longitudinal beam section, and rear sub-frame mounting brackets are respectively provided at the bottom of the front longitudinal beam section on both sides of the shock absorption spring mounting portion before and after. Undoubtedly, the technical solution disclosed in the above patent document is a beneficial attempt in the technical field. By providing a longitudinal beam main body with an open side and a longitudinal beam cover plate covering the open side, the rear floor longitudinal beam structure can facilitate reducing the occupied space of the rear floor longitudinal beam structure in the vehicle width direction, thereby improving the layout flexibility of the rear suspension system components. Although the rear floor longitudinal beam structure enhances the function integration to a certain extent, the rear floor longitudinal beam structure is a component formed by welding a plurality of split parts together, and there are still problems such as complex structural design, many welding processes, and inability to simultaneously meet the improvement of body strength performance and the reduction of body weight.

[0004] To solve the above technical problem of simultaneously improving the body strength performance and reducing the body weight, in the prior art, the rear frame connecting member is changed to an aluminum alloy casting structure, and the sill side beam and the rear longitudinal beam are changed to aluminum alloy profile structures. For example, CN218112795U discloses an automobile rear floor skeleton assembly and an automobile. The automobile rear floor skeleton assembly includes: a left rear floor longitudinal beam assembly, a right rear floor longitudinal beam assembly, a front rear floor cross beam, and a rear rear floor cross beam; the left rear floor longitudinal beam assembly and the right rear floor longitudinal beam assembly are symmetrically arranged with respect to a first axis; the left rear floor longitudinal beam assembly includes a left rear frame connecting member and a left rear longitudinal beam, the left rear frame connecting member is an aluminum alloy casting structure, and the left rear longitudinal beam is an aluminum alloy profile structure; the right rear floor longitudinal beam assembly includes a right rear frame connecting member and a right rear longitudinal beam, the right rear frame connecting member is an aluminum alloy casting structure, and the right rear longitudinal beam is an aluminum alloy profile structure. Undoubtedly, the technical solution disclosed in the above patent document is a beneficial attempt in the technical field. The technical solution of this patent document reduces the weight of the automobile rear floor skeleton assembly while ensuring the overall strength of the left rear frame connecting member and the right rear frame connecting member, which is conducive to reducing the number of components and is easy to manufacture. However, the left rear frame connecting member and the right rear frame connecting member in this patent document have a weak function integration degree, which is not conducive to simplifying the vehicle body structure. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a rear frame connecting member that can enhance the function integration degree, ensure the body structure stability while meeting the vehicle lightweight, improve the vehicle driving performance, and ensure the riding safety and comfort of the internal passengers; another object of the present invention is to provide a rear floor assembly installation structure including the above rear frame connecting member, which can take into account the lightweight and ensure the rear floor support strength; another object of the present invention is to provide an automobile including the above rear floor assembly installation structure, which has good body structure stability and can ensure the riding safety and comfort of the internal passengers.

[0006] A rear frame connecting member in the present invention includes an aluminum alloy casting body. A sill side beam connecting portion is provided at the front of the aluminum alloy casting body, and a rear longitudinal beam connecting portion is provided at the rear. A first cavity is provided inside the aluminum alloy casting body, and a second cavity is provided outside. A spring mounting point is provided on the aluminum alloy casting body. A first strengthening structure is provided at a position above the spring mounting point corresponding to the first cavity. The first strengthening structure includes a plurality of first reinforcing ribs spaced at intervals in the front-rear direction. A second strengthening structure is provided at a position above the spring mounting point corresponding to the second cavity. The second strengthening structure includes a plurality of second reinforcing ribs spaced at intervals in the front-rear direction. The first reinforcing ribs and the second reinforcing ribs are both arranged in the up-down direction, which is consistent with the acting force direction of the air spring installed through the spring mounting point (103), so as to transmit the Z-direction momentum acting on the spring mounting point (103).

[0007] Further, a first rear shock absorber mounting point and a second rear shock absorber mounting point are provided at intervals in the front-rear direction in the middle of the aluminum alloy casting body, and a chassis controller mounting point is provided between the first rear shock absorber mounting point and the second rear shock absorber mounting point.

[0008] Further, upper body lapping holes are provided on the upper sides of the first rear shock absorber mounting point and the second rear shock absorber mounting point.

[0009] Further, an interior trim mounting point and a plurality of seat bracket mounting points are provided at a position on the inner side of the aluminum alloy casting body corresponding to the front side of the first rear shock absorber mounting point, and a plurality of exterior trim mounting points are provided on the outer side of the aluminum alloy casting body.

[0010] Further, a chassis rear overhang rear mounting point and a chassis rear overhang front mounting point are provided on the aluminum alloy casting body.

[0011] Further, a cavity lower plate is provided at the bottom of the aluminum alloy casting body, and the spring mounting point protrudes downward from the cavity lower plate. A first cavity upper plate is provided at a position on the inner side of the aluminum alloy casting body corresponding to the upper side of the cavity lower plate. The first cavity is formed between the inner side of the cavity lower plate and the first cavity upper plate. A second cavity upper plate is provided at a position on the outer side of the aluminum alloy casting body corresponding to the upper side of the cavity lower plate. The second cavity is formed between the outer side of the cavity lower plate and the second cavity upper plate.

[0012] Further, a first reinforcing rib plate is disposed on the aluminum alloy casting body between the cavity lower plate and the first cavity upper plate. The first reinforcing rib plate divides the first cavity into two upper and lower first separated cavities, and a plurality of the first reinforcing ribs intersect with the first reinforcing rib plate; a second reinforcing rib plate is disposed on the aluminum alloy casting body between the cavity lower plate and the second cavity upper plate. The second reinforcing rib plate divides the second cavity into two upper and lower second separated cavities, and a plurality of the second reinforcing ribs intersect with the second reinforcing rib plate.

[0013] Further, a plurality of first auxiliary reinforcing ribs are disposed on the aluminum alloy casting body. At least part of the first auxiliary reinforcing ribs are arranged at intervals in the front-rear direction on the front side of the second reinforcing structure, and at least part of the first auxiliary reinforcing ribs are arranged at intervals in the front-rear direction on the rear side of the second reinforcing structure; the upper and lower ends of the first auxiliary reinforcing ribs are respectively connected to the first cavity upper plate and the cavity lower plate; the middle parts of a plurality of the first auxiliary reinforcing ribs intersect with the first reinforcing rib plate.

[0014] Further, a third reinforcing rib plate is disposed below the rear part of the second reinforcing rib plate. The rear part of the third reinforcing rib plate is connected to the rear longitudinal beam connecting part, and the front part of the third reinforcing rib plate is connected to the cavity lower plate.

[0015] Further, a plurality of second auxiliary reinforcing ribs are arranged at intervals in the front-rear direction on the rear side of the second reinforcing structure. The length of the second auxiliary reinforcing ribs is in the up-down direction. A plurality of the second auxiliary reinforcing ribs intersect with the second reinforcing rib plate, and a plurality of the second auxiliary reinforcing ribs intersect with the third reinforcing rib plate.

[0016] Further, demolding ejector pins are provided at at least part of the intersections of the first reinforcing ribs and the first reinforcing rib plate, at least part of the intersections of the first auxiliary reinforcing ribs and the first reinforcing rib plate, at least part of the intersections of the second reinforcing ribs and the second reinforcing rib plate, at least part of the intersections of the second auxiliary reinforcing ribs and the second reinforcing rib plate, and at least part of the intersections of the second auxiliary reinforcing ribs and the third reinforcing rib plate.

[0017] Further, a plurality of riveting holes penetrating in the inner-outer direction and a plurality of bolt mounting bosses protruding inward from the sill side beam connecting part are provided on the sill side beam connecting part.

[0018] Further, a plurality of cavitys for lapping the rear floor cross beam with an inward opening are provided on the aluminum alloy casting body.

[0019] An installation structure of a rear floor assembly in the present invention includes a rear floor assembly and two of the above-mentioned rear frame connectors. The two rear frame connectors are symmetrically arranged on the left and right sides of the rear floor assembly. Further, the rear floor assembly includes three rear floor crossbeams and two rear floor sheet metals. The three rear floor crossbeams are all made of aluminum alloy profiles. The three rear floor crossbeams are arranged at intervals from front to back and form the frame of the rear floor assembly. The two rear floor sheet metals are respectively arranged on the upper and lower sides of the frame and cover the frame formed by the three rear floor crossbeams, forming a steel-aluminum hybrid lap joint structure.

[0020] A vehicle in the present invention includes the above-mentioned installation structure of the rear floor assembly. Further, the rear frame connectors on the left and right sides of the rear floor assembly are both connected to the door sill side beam of the vehicle through the door sill side beam connection part, and the rear frame connectors on the left and right sides of the rear floor assembly are both connected to the rear longitudinal beam of the vehicle through the rear longitudinal beam connection part.

[0021] The beneficial effects of the present invention are:

[0022] 1. The rear frame connectors of the present invention integrate a spring mounting point, a first rear shock absorber mounting point, a second rear shock absorber mounting point, a chassis controller mounting point, an upper body lap joint hole, an interior trim mounting point, a seat bracket mounting point, an exterior trim mounting point, a rear mounting point of the chassis rear suspension, and a front mounting point of the chassis rear suspension. The positions of each mounting point are reasonably arranged, the space utilization rate is optimized, and the function integration degree is enhanced.

[0023] 2. The rear frame connectors of the present invention can improve the stiffness and strength above the spring mounting point through the first reinforcing rib and the second reinforcing rib, prevent deformation at this position due to frequent stress, achieve the optimization of the vehicle body structure and the reduction of the vehicle body weight while meeting the improvement of the vehicle body performance; and through the first reinforcing rib and the second reinforcing rib, the Z-direction momentum of the air spring can be transmitted to the remaining positions of the aluminum alloy casting body, so as to realize the conversion of the Z-direction momentum into material internal energy, and then reduce the change amount of the vehicle body's Z-direction kinetic energy, which can effectively improve the driving performance of the vehicle and enhance the driving safety and the comfort of the passengers.

[0024] 3. The aluminum alloy casting body of the present invention is processed by a high-vacuum die-cast aluminum alloy forming process, which reduces the connection tolerance error of the previous sheet metal parts, and also reduces the precision disturbance and material waste caused by processes such as welding, and plays an important role in improving the overall precision of the vehicle body; the material of the aluminum alloy casting body is selected as AlSi10MnMg-T7, which has the advantages of energy absorption, buffering, extension, and corrosion resistance, etc., ensuring the basic functions of the rear frame connectors such as load-bearing, force transmission, and energy absorption, and can further improve the driving performance of the vehicle and further enhance the driving safety and the comfort of the passengers.

[0025] 4. The first reinforcing rib, second reinforcing rib, first auxiliary reinforcing rib, second auxiliary reinforcing rib, first reinforcing rib plate, second reinforcing rib plate, and third reinforcing rib plate of the rear frame connecting member of the present invention form a plurality of rectangular small cavities on both the inner and outer sides of the aluminum alloy casting body, which is beneficial to the lightweight of the vehicle, is beneficial to transferring the kinetic energy in the Z direction and X direction to various positions of the aluminum alloy casting body, and the design form of the plurality of rectangular small cavities and the setting of demoulding ejector pins at some intersections can increase the anti-collision performance in the Y direction. When the vehicle undergoes a small offset collision, the offset momentum can be effectively absorbed, thereby ensuring the stability of the body structure, improving the driving performance of the vehicle, and ensuring the riding safety and comfort of the internal occupants.

[0026] 5. On the one hand, the demoulding ejector pin of the present invention can be used as a force application point for demoulding during casting to prevent the aluminum alloy casting body from deforming during demoulding. On the other hand, the demoulding ejector pin can increase the strength at the intersections of each reinforcing rib and reinforcing flange.

[0027] 6. The bolt mounting boss is provided on the sill side beam connecting part of the present invention. The bolt mounting boss can ensure the thickness, enhance the structural strength of the flat surface of the cast aluminum part, and prevent deformation during casting, machining, and tooling processes. At the same time, when the sill side beam connecting part is connected to the sill side beam, each riveting hole is connected by riveting, and each bolt mounting boss is connected by a threaded connector. By the way of riveting plus bolt connection, the connection effectiveness can be effectively ensured.

[0028] 7. The rear floor assembly and the rear frame connecting member of the present invention can form a steel-aluminum hybrid lap joint structure, which can take into account lightweight and ensure the support strength of the rear floor. The connection method is simple and easy to realize automated processing during production line processing, which is beneficial to improving the overall production rhythm. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solution, and beneficial effects of the present invention clearer, the following drawings are provided for illustration:

[0030] Figure 1 It is a schematic structural diagram of the rear frame connecting member of the present invention (this view is facing the inner side of the rear frame connecting member);

[0031] Figure 2 It is a schematic structural diagram of the rear frame connecting member of the present invention (this view is facing the outer side of the rear frame connecting member);

[0032] Figure 3 It is a bottom view schematic diagram of the rear frame connecting member of the present invention;

[0033] Figure 4 It is a partial enlarged schematic diagram of the spring mounting point and its periphery of the rear frame connecting member of the present invention;

[0034] Figure 5 A partial enlarged schematic view of the second reinforcement structure of the rear frame connector of the present invention and its periphery;

[0035] Figure 6 A partial enlarged schematic view of the bolt mounting boss of the rear frame connector of the present invention and its periphery;

[0036] Figure 7 A schematic structural view of the installation structure of the rear floor assembly of the present invention;

[0037] Figure 8 A partial enlarged schematic view of the connection between the rear frame connector and the rear floor assembly of the present invention (this figure shows the state during the approaching process of the two).

[0038] The reference signs in the drawings are as follows:

[0039] 100 - Rear frame connector, 101 - Threshold side beam connection part, 102 - Rear longitudinal beam connection part, 103 - Spring mounting point, 104 - First rear shock absorber mounting point, 105 - Second rear shock absorber mounting point, 106 - Chassis controller mounting point, 107 - Relief groove, 108 - Upper body lapping hole, 109 - Interior trim mounting point, 110 - Seat bracket mounting point, 111 - Exterior trim mounting point, 112 - Rear mounting point of the chassis rear suspension, 113 - Front mounting point of the chassis rear suspension, 114 - First reinforcing rib, 115 - Second reinforcing rib, 116 - First cavity upper plate, 117 - Second cavity upper plate, 118 - Cavity lower plate, 119 - First reinforcing rib plate, 120 - Second reinforcing rib plate, 121 - Third reinforcing rib plate, 122 - First auxiliary reinforcing rib, 123 - Second auxiliary reinforcing rib, 124 - Riveting hole, 125 - Bolt mounting boss, 126 - Rear floor crossbeam lapping cavity, 127 - Demolding ejector pin;

[0040] 200 - Rear floor assembly. Detailed implementation manners

[0041] The technical solution of the present invention will be described in detail below in conjunction with the drawings and embodiments. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex. In addition, the terms "first" and "second" in the following embodiments are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present disclosure, "a plurality" means two or more unless otherwise specifically defined.

[0042] As Figures 1-6 shown, a rear frame connecting member 100 in this embodiment includes an aluminum alloy casting main body. A sill side beam connecting portion 101 is provided at the front of the aluminum alloy casting main body, and a rear longitudinal beam connecting portion 102 is provided at the rear. A first cavity is provided inside the aluminum alloy casting main body, and a second cavity is provided outside. A spring mounting point 103 is provided on the aluminum alloy casting main body. A first strengthening structure is provided at a position above the spring mounting point 103 corresponding to the first cavity. The first strengthening structure includes a plurality of first strengthening ribs 114 spaced along the front-rear direction. A second strengthening structure is provided at a position above the spring mounting point 103 corresponding to the second cavity. The second strengthening structure includes a plurality of second strengthening ribs 115 spaced along the front-rear direction. The lengths of the first strengthening ribs 114 and the second strengthening ribs 115 are arranged in the up-down direction, which is consistent with the acting force direction of the air spring installed through the spring mounting point 103, so as to transmit the Z-direction momentum acting on the spring mounting point 103. It is worth noting that the "inner side" refers to the side of the rear frame connecting member 100 close to the rear floor assembly 200, and the "outer side" refers to the side of the rear frame connecting member 100 away from the rear floor assembly 200.

[0043] The first cavity and the second cavity can reduce the weight of the rear frame connecting member 100, which is beneficial to the lightweight of the vehicle. The spring mounting point 103 is integrated on the aluminum alloy casting main body. The spring mounting point 103 can be used to connect with the air spring of the vehicle, enhancing the function integration degree. The first strengthening ribs 114 and the second strengthening ribs 115 can improve the stiffness and strength above the spring mounting point 103, preventing deformation at this position due to frequent stress, achieving the optimization of the vehicle body structure and the reduction of the vehicle body weight while meeting the improvement of the vehicle body performance; As Figure 3 and Figure 4As shown, in addition, the spring mounting point 103 is a frustum-shaped structure with a decreasing outer diameter from top to bottom. After the air spring is connected to this frustum-shaped structure, when the vehicle encounters undulating roads or poor road conditions such as rough sand and gravel during driving, resulting in vehicle jolts, as Figure 1 、 Figure 2 and Figure 5 shown, since the lengths of the first reinforcing rib 114 and the second reinforcing rib 115 are both in the up-and-down direction, and the up-and-down direction is the Z direction, under the action of the first reinforcing rib 114 and the second reinforcing rib 115, the Z-direction momentum of the air spring acts on the cavity lower plate 118 at the bottom of the aluminum alloy casting body, and through the first reinforcing rib 114 and the second reinforcing rib 115, this Z-direction momentum is transmitted to the rest of the aluminum alloy casting body, thereby realizing the conversion of this Z-direction momentum into material internal energy, and further reducing the change in the kinetic energy of the vehicle body in the Z direction, which can effectively improve the driving performance of the vehicle, enhance driving safety and the comfort of passengers. The aluminum alloy casting body is processed by a high-vacuum die-casting aluminum alloy forming process, which reduces the connection tolerance error of the previous sheet metal parts, and also reduces the precision disturbance and material waste caused by processes such as welding, and plays an important role in improving the overall precision of the vehicle body; the material of the aluminum alloy casting body is selected as AlSi10MnMg-T7, which has advantages in energy absorption, buffering, extension, and corrosion resistance, etc., ensuring the basic functions of the rear frame connecting piece 100 such as load bearing, force transmission, and energy absorption, and can further improve the driving performance of the vehicle, enhance driving safety and the comfort of passengers.

[0044] In this embodiment, as Figure 1 shown, the middle part of the aluminum alloy casting body is provided with a first rear shock absorber mounting point 104 and a second rear shock absorber mounting point 105 arranged at intervals in the front-rear direction, and a chassis controller mounting point 106 is arranged between the first rear shock absorber mounting point 104 and the second rear shock absorber mounting point 105. When the first rear shock absorber mounting point 104 and the second rear shock absorber mounting point 105 are connected to the rear shock absorber, the rear shock absorber extends from the bottom up below the first rear shock absorber mounting point 104 and the second rear shock absorber mounting point 105, and then through two large pan head bolts, it is driven in the Z direction (the Z direction here is the up-and-down direction) from top to bottom, effectively connecting the rear frame connecting piece 100 and the rear shock absorber. At the same time, by using the position between the first rear shock absorber mounting point 104 and the second rear shock absorber mounting point 105 to arrange the chassis controller mounting point 106, the first rear shock absorber mounting point 104, the second rear shock absorber mounting point 105, and the chassis controller mounting point 106 are arranged compactly, optimizing the space utilization rate on the aluminum alloy casting body, and further enhancing the functional integration degree of the rear frame connecting piece 100. As Figure 1 and Figure 3As shown, the position of the spring mounting point 103 in the front-rear direction is located at the rear side of the second rear shock absorber mounting point 105. The mounting positions of the air spring and the rear shock absorber are staggered in the front-rear direction, which can prevent the positions where the main body of the aluminum alloy combined casting is stressed from being concentrated at one place, and is beneficial to improving the service life of the main body of the aluminum alloy casting. As Figure 3 As shown, a relief groove 107 is provided at the position corresponding to the lower sides of the first rear shock absorber mounting point 104 and the second rear shock absorber mounting point 105 on the cavity lower plate 118, for the rear shock absorber to extend below the first rear shock absorber mounting point 104 and the second rear shock absorber mounting point 105.

[0045] In this embodiment, as Figure 1 and Figure 2 As shown, upper body lapping holes 108 are provided on the upper sides of the first rear shock absorber mounting point 104 and the second rear shock absorber mounting point 105. The upper body lapping holes 108 are used to connect with the vehicle upper body. A plurality of upper body lapping holes 108 are arranged at intervals in the front-rear direction. In this embodiment, there are four upper body lapping holes 108.

[0046] In this embodiment, as Figure 1 and Figure 2 As shown, an interior trim mounting point 109 and a plurality of seat bracket mounting points 110 are provided at the position corresponding to the front side of the first rear shock absorber mounting point 104 on the inner side of the aluminum alloy casting main body, and a plurality of exterior trim mounting points 111 are provided on the outer side of the aluminum alloy casting main body. Integrating the interior trim mounting point 109, the seat bracket mounting points 110 and the exterior trim mounting points 111 on the aluminum alloy casting main body further enhances the functional integration degree of the rear frame connecting member 100. Preferably, reinforcing rib structures are provided around the seat bracket mounting points 110 and around the exterior trim mounting points 111, and the specific arrangement form of the reinforcing rib structures can be a criss-cross arrangement form.

[0047] In this embodiment, as Figures 1-3 As shown, a rear mounting point 112 of the chassis rear suspension and a front mounting point 113 of the chassis rear suspension are provided on the aluminum alloy casting main body, further enhancing the functional integration degree of the rear frame connecting member 100. Specifically, both the rear mounting point 112 of the chassis rear suspension and the front mounting point 113 of the chassis rear suspension are provided on the cavity lower plate 118. There are three rear floor crossmember lapping cavities 126 arranged at intervals in the front-rear direction. The front mounting point 113 of the chassis rear suspension is below the frontmost rear floor crossmember lapping cavity 126, and the rear mounting point 112 of the chassis rear suspension is located below the rearmost rear floor crossmember lapping cavity 126.

[0048] In this embodiment, as Figure 1 and Figure 2As shown, a cavity lower plate 118 is provided at the bottom of the aluminum alloy casting body, and the spring mounting point 103 protrudes downward from the cavity lower plate 118; a first cavity upper plate 116 is provided inside the aluminum alloy casting body corresponding to the position above the cavity lower plate 118, and a first cavity is formed between the inside of the cavity lower plate 118 and the first cavity upper plate 116; a second cavity upper plate 117 is provided outside the aluminum alloy casting body corresponding to the position above the cavity lower plate 118, and a second cavity is formed between the outside of the cavity lower plate 118 and the second cavity upper plate 117. The cavity lower plate 118 is used to set the spring mounting point 103, the rear mounting point 112 of the chassis rear suspension, and the front mounting point 113 of the chassis rear suspension.

[0049] In this embodiment, as Figure 1 and Figure 2 shown, a first reinforcing rib plate 119 is provided on the aluminum alloy casting body between the cavity lower plate 118 and the first cavity upper plate 116. The first reinforcing rib plate 119 divides the first cavity into two upper and lower first divided cavities, and multiple first reinforcing ribs 114 all intersect with the first reinforcing rib plate 119; a second reinforcing rib plate 120 is provided on the aluminum alloy casting body between the cavity lower plate 118 and the second cavity upper plate 117. The second reinforcing rib plate 120 divides the second cavity into two upper and lower second divided cavities, and multiple second reinforcing ribs 115 all intersect with the second reinforcing rib plate 120. The first reinforcing rib plate 119 and the second reinforcing rib plate 120 can optimize the force transmission path, which is beneficial to transfer the Z-direction momentum to the remaining positions of the aluminum alloy casting body through the first reinforcing rib 114, the first reinforcing rib plate 119, the second reinforcing rib 115, and the second reinforcing rib plate 120, so as to realize the conversion of the Z-direction momentum into material internal energy, and further reduce the change amount of the vehicle body's Z-direction kinetic energy. As Figure 1 、 Figure 2 and Figure 5 shown, the number of both the first reinforcing rib 114 and the second reinforcing rib 115 is four. The four first reinforcing ribs 114 divide the two upper and lower first divided cavities into six rectangular small cavities, and the four second reinforcing ribs 115 also divide the two upper and lower second divided cavities into six rectangular small cavities, which can provide sufficient support and a good force transmission path for the spring mounting point 103.

[0050] In this embodiment, a plurality of first auxiliary reinforcing ribs 122 are provided on the main body of the aluminum alloy casting. At least part of the first auxiliary reinforcing ribs 122 are arranged at intervals in the front-rear direction on the front side of the second reinforcing structure, and at least part of the first auxiliary reinforcing ribs 122 are arranged at intervals in the front-rear direction on the rear side of the second reinforcing structure; the upper and lower ends of the first auxiliary reinforcing ribs 122 are respectively connected to the upper plate 116 of the first cavity and the lower plate 118 of the cavity; the middle parts of the plurality of first auxiliary reinforcing ribs 122 intersect with the first reinforcing rib plate 119. The first reinforcing rib plate 119 divides the first cavity into two upper and lower first divided cavities. The first reinforcing rib 114 and the first auxiliary reinforcing rib 122 can further divide the first cavity into a plurality of rectangular small cavities, which can further optimize the force transmission path. When the vehicle encounters bumpy roads or harsh road conditions such as gravel during driving, resulting in vehicle jolts, the Z-direction momentum of the air spring, the rear mounting point 112 of the chassis rear suspension, and the front mounting point 113 of the chassis rear suspension acts on the lower plate 118 of the cavity at the bottom of the main body of the aluminum alloy casting. The plurality of rectangular small cavities can transfer this Z-direction momentum to the remaining positions of the main body of the aluminum alloy casting, thereby realizing the conversion of this Z-direction momentum into material internal energy, and further reducing the change in the kinetic energy of the vehicle body in the Z direction.

[0051] In this embodiment, as Figure 2 shown, a third reinforcing rib plate 121 is provided below the rear part of the second reinforcing rib plate 120. The rear part of the third reinforcing rib plate 121 is connected to the rear longitudinal beam connecting part 102, and the front part of the third reinforcing rib plate 121 is connected to the lower plate 118 of the cavity. In this embodiment, a plurality of second auxiliary reinforcing ribs 123 are arranged at intervals in the front-rear direction on the rear side of the second reinforcing structure. The length of the second auxiliary reinforcing ribs 123 is in the up-down direction. The plurality of second auxiliary reinforcing ribs 123 all intersect with the second reinforcing rib plate 120, and the plurality of second auxiliary reinforcing ribs 123 all intersect with the third reinforcing rib plate 121. The third reinforcing rib plate 121 and the second reinforcing rib plate 120 are beneficial to constructing a force transmission channel between the main body of the aluminum alloy casting and the rear longitudinal beam. The second auxiliary reinforcing ribs 123, the second reinforcing rib plate 120, and the third reinforcing rib plate 121 form a plurality of rectangular small cavities, which are beneficial to transferring kinetic energy to various positions of the main body of the aluminum alloy casting, thereby effectively transmitting the X-direction momentum caused by starting, sudden braking, acceleration, etc. during vehicle driving, ensuring the structural stability of the vehicle body, and improving the driving performance of the vehicle.

[0052] In this embodiment, as Figure 1 , Figure 2 and Figure 5As shown, demolding ejector pins 127 are provided at the intersections of at least part of the first reinforcing ribs 114 and the first reinforcing rib plate 119, at the intersections of at least part of the first auxiliary reinforcing ribs 122 and the first reinforcing rib plate 119, at the intersections of at least part of the second reinforcing ribs 115 and the second reinforcing rib plate 120, at the intersections of at least part of the second auxiliary reinforcing ribs 123 and the second reinforcing rib plate 120, and at the intersections of at least part of the second auxiliary reinforcing ribs 123 and the third reinforcing rib plate 121. The axis of the demolding ejector pin 127 is along the Y direction (the Y direction here is the inside-outside direction in the above text). The demolding ejector pin 127 increases the thickness at each intersection point. On the one hand, the demolding ejector pin 127 can be used as a force application point for demolding during casting to prevent deformation of the main body of the aluminum alloy casting during demolding. On the other hand, the demolding ejector pin 127 can increase the strength at the intersections of each reinforcing rib and the reinforcing flange. The structure formed by the combination of the multiple rectangular small cavities composed of each reinforcing rib and the reinforcing flange and the demolding ejector pin 127 can increase the anti-collision performance in the Y direction. When the vehicle undergoes a small offset collision, the offset momentum can be effectively absorbed, ensuring the stability of the vehicle body, the riding safety and riding comfort of the internal occupants.

[0053] In summary, the lengths of the first cavity upper plate 116, the second cavity upper plate 117, and the cavity lower plate 118 are all along the length direction of the aluminum alloy casting body (i.e., the front-back direction). Therefore, both the first cavity and the second cavity are hollow structures along the length direction of the aluminum alloy casting body. The shapes of the first cavity and the second cavity are both approximately arched with the front and back ends downward. The upper and lower ends of the first reinforcing rib 114 and the first auxiliary reinforcing rib 122 are respectively connected to the first cavity upper plate 116 and the cavity lower plate 118, and the middle parts of the first reinforcing rib 114 and the first auxiliary reinforcing rib 122 are connected to the first reinforcing rib plate 119. The upper and lower ends of the second reinforcing rib 115 and the second auxiliary reinforcing rib 123 are respectively connected to the second cavity upper plate 117 and the cavity lower plate 118, and the middle parts of the second reinforcing rib 115 and the second auxiliary reinforcing rib 123 are both connected to the second reinforcing rib plate 120. The first reinforcing rib 114, the second reinforcing rib 115, the first auxiliary reinforcing rib 122, the second auxiliary reinforcing rib 123, the first reinforcing rib plate 119, the second reinforcing rib plate 120, and the third reinforcing rib plate 121 form multiple rectangular small cavities on both the inner and outer sides of the aluminum alloy casting body, which is beneficial for automotive lightweight and energy transfer paths. During vehicle driving, it is beneficial to transfer the kinetic energy in the Z direction and the X direction to various positions of the aluminum alloy casting body. When the vehicle encounters undulating roads or harsh road conditions such as gravel during driving, resulting in vehicle bumping, the Z-direction momentum of the air spring, the rear mounting point 112 of the chassis rear suspension, and the front mounting point 113 of the chassis rear suspension acts on the cavity lower plate 118 at the bottom of the aluminum alloy casting body. The multiple rectangular small cavities can transfer this Z-direction momentum to the remaining positions of the aluminum alloy casting body, thereby realizing the conversion of this Z-direction momentum into material internal energy, and further reducing the change in the kinetic energy of the vehicle body in the Z direction. The special arrangement form of the first reinforcing rib 114, the second reinforcing rib 115, the first auxiliary reinforcing rib 122, the second auxiliary reinforcing rib 123, the first reinforcing rib plate 119, the second reinforcing rib plate 120, and the third reinforcing rib plate 121 can also effectively transfer the X-direction momentum caused by starting, sudden braking, acceleration, etc. during vehicle driving, reducing the change in the kinetic energy of the vehicle body in the X direction. In addition, the design form of the multiple rectangular small cavities can increase the anti-collision performance in the Y direction. When the vehicle undergoes a small-offset collision, it can effectively absorb the offset momentum, thereby ensuring the structural stability of the vehicle body, improving the driving performance of the vehicle, and ensuring the riding safety and riding comfort of the internal occupants.

[0054] In this embodiment, as Figure 1 and Figure 6As shown, a plurality of riveting holes 124 penetrating in the inner and outer directions and a plurality of bolt mounting bosses 125 protruding inward from the sill side beam connecting portion 101 are provided on the sill side beam connecting portion 101. After casting, threaded holes are machined on the sill side beam connecting portion 101 by machining threads. If a conventional flat plate structure is adopted, it is easy to cause tearing defects at the bolt connection, resulting in connection failure. Moreover, the flat plate structure is prone to deformation during the casting process and the tooling process, leading to unqualified assembly accuracy. In this embodiment, by providing the bolt mounting bosses 125 on the sill side beam connecting portion 101, threaded holes are machined on the bolt mounting bosses 125 by machining after casting. The bolt mounting bosses 125 can ensure the thickness, enhance the structural strength of the flat surface of the cast aluminum part, prevent deformation during the casting process, machining process and tooling process. At the same time, when the sill side beam connecting portion 101 is connected to the sill side beam, each riveting hole 124 is connected to the sill side beam by riveting, and each bolt mounting boss 125 is connected to the sill side beam by bolts. By the way of riveting plus bolts, the connection effectiveness can be effectively ensured.

[0055] In this embodiment, as Figure 1 shown, a plurality of rear floor crossbeam lapping cavities 126 opening inward are provided on the main body of the aluminum alloy casting. Three rear floor crossbeam lapping cavities 126 are arranged at intervals in the front-rear direction, and the three rear floor crossbeam lapping cavities 126 are used to connect with the rear floor crossbeams of the rear floor assembly 200.

[0056] As Figure 7 shown, an installation structure of a rear floor assembly in this embodiment includes a rear floor assembly 200 and two of the above-mentioned rear frame connectors 100. The two rear frame connectors 100 are symmetrically arranged on the left and right sides of the rear floor assembly 200. The rear floor assembly 200 includes three rear floor crossbeams and two rear floor sheet metals. The three rear floor crossbeams are all aluminum alloy profiles. The three rear floor crossbeams are arranged at intervals from front to back and form the framework of the rear floor assembly 200. The two rear floor sheet metals are respectively arranged on the upper and lower sides of the framework and cover the framework composed of the three rear floor crossbeams, forming a steel-aluminum hybrid lapping structure, which can take into account lightweight and ensure the support strength of the rear floor. As Figure 8As shown, when the rear floor assembly 200 is connected to the rear frame connecting member 100, the rear frame connecting member and the rear floor assembly gradually approach each other. The rear floor cross beam of the rear frame connecting member overlaps with the rear frame connecting member 100, and the rear floor sheet metal also overlaps with the rear frame connecting member 100. After overlapping, they are connected by riveting. The specific riveting relationship is as follows: Rivet the rear floor cross beam overlapping cavity 126 of two symmetric rear frame connecting members 100 with the rear floor cross beam, and at the same time rivet part of the rear floor sheet metal with the first cavity upper plate 116 of the rear frame connecting member 100. The connection method is simple and easy to realize automated processing during production line processing, which is beneficial to improving the overall production rhythm. It should be noted that the inner sides of the two symmetric rear frame connecting members 100 both face the rear floor assembly 200, and the inner sides of the two symmetric rear frame connecting members 100 are respectively connected to the left and right sides of the rear floor assembly 200.

[0057] A vehicle in this embodiment includes the above rear floor assembly installation structure. During assembly, the rear frame connecting members 100 on the left and right sides of the rear floor assembly 200 are both connected to the vehicle's sill side beam through the sill side beam connection part 101, and the connection method is riveting plus bolt connection; the rear frame connecting members 100 on the left and right sides of the rear floor assembly 200 are both connected to the vehicle's rear longitudinal beam through the rear longitudinal beam connection part 102, and the connection method is riveting. The vehicle in this embodiment has good body structure stability, which can ensure the riding safety and riding comfort of the internal occupants.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A rear frame connecting member, comprising an aluminum alloy casting body, wherein a sill side beam connecting portion (101) is provided at the front of the aluminum alloy casting body, and a rear longitudinal beam connecting portion (102) is provided at the rear, and is characterized in that: The inner side of the aluminum alloy casting body is provided with a first cavity, and the outer side is provided with a second cavity; a spring mounting point (103) is provided on the aluminum alloy casting body. The first cavity is provided with a first strengthening structure at a position above the spring mounting point (103). The first strengthening structure includes a plurality of first reinforcing ribs (114) spaced at intervals in the front-back direction; the second cavity is provided with a second strengthening structure at a position above the spring mounting point (103). The second strengthening structure includes a plurality of second reinforcing ribs (115) spaced at intervals in the front-back direction; both the first reinforcing ribs (114) and the second reinforcing ribs (115) are arranged in the up-down direction, which is consistent with the acting force direction of the air spring installed through the spring mounting point (103), so as to transmit the Z-direction momentum acting on the spring mounting point (103). The spring mounting point (103) is a frustum-shaped structure with a decreasing outer diameter from top to bottom, and the air spring is connected to this frustum-shaped structure. A cavity lower plate (118) is provided at the bottom of the aluminum alloy casting body, and the spring mounting point (103) protrudes downward from the cavity lower plate (118); on the inner side of the aluminum alloy casting body, a first cavity upper plate (116) is provided at a position above the cavity lower plate (118). The first cavity is formed between the inner side of the cavity lower plate (118) and the first cavity upper plate (116); on the outer side of the aluminum alloy casting body, a second cavity upper plate (117) is provided at a position above the cavity lower plate (118). The second cavity is formed between the outer side of the cavity lower plate (118) and the second cavity upper plate (117).

2. The rear frame connecting member according to claim 1, characterized in that: The middle part of the aluminum alloy casting body is provided with a first rear shock absorber mounting point (104) and a second rear shock absorber mounting point (105) spaced at intervals in the front-back direction, and a chassis controller mounting point (106) is provided between the first rear shock absorber mounting point (104) and the second rear shock absorber mounting point (105).

3. The rear frame connecting member according to claim 2, characterized in that: Upper body lapping holes (108) are provided on the upper sides of the first rear shock absorber mounting point (104) and the second rear shock absorber mounting point (105).

4. The rear frame connecting member according to claim 2, wherein: On the inner side of the aluminum alloy casting body, an interior trim mounting point (109) and a plurality of seat bracket mounting points (110) are provided at positions in front of the first rear shock absorber mounting point (104), and a plurality of exterior trim mounting points (111) are provided on the outer side of the aluminum alloy casting body.

5. The rear frame connecting member according to claim 1, characterized in that: A chassis rear suspension rear mounting point (112) and a chassis rear suspension front mounting point (113) are provided on the aluminum alloy casting body.

6. The rear frame connecting member according to claim 1, wherein: On the main body of the aluminum alloy casting, there is a first reinforcing rib plate (119) located between the lower cavity plate (118) and the first upper cavity plate (116). The first reinforcing rib plate (119) divides the first cavity into two upper and lower first separated cavities, and multiple first reinforcing ribs (114) all intersect with the first reinforcing rib plate (119); on the main body of the aluminum alloy casting, there is a second reinforcing rib plate (120) located between the lower cavity plate (118) and the second upper cavity plate (117). The second reinforcing rib plate (120) divides the second cavity into two upper and lower second separated cavities, and multiple second reinforcing ribs (115) all intersect with the second reinforcing rib plate (120).

7. The rear frame connecting member according to claim 6, wherein: On the main body of the aluminum alloy casting, there are multiple first auxiliary reinforcing ribs (122). At least part of the first auxiliary reinforcing ribs (122) are arranged at intervals in the front-rear direction on the front side of the second reinforcing structure, and at least part of the first auxiliary reinforcing ribs (122) are arranged at intervals in the front-rear direction on the rear side of the second reinforcing structure; the upper and lower ends of the first auxiliary reinforcing ribs (122) are respectively connected to the first upper cavity plate (116) and the lower cavity plate (118); the middle parts of multiple first auxiliary reinforcing ribs (122) all intersect with the first reinforcing rib plate (119).

8. The rear frame connecting member according to claim 7, characterized in that: Below the rear part of the second reinforcing rib plate (120), there is a third reinforcing rib plate (121). The rear part of the third reinforcing rib plate (121) is connected to the rear longitudinal beam connecting part (102), and the front part of the third reinforcing rib plate (121) is connected to the lower cavity plate (118).

9. The rear frame connecting member according to claim 8, wherein: On the rear side of the second reinforcing structure, multiple second auxiliary reinforcing ribs (123) are arranged at intervals in the front-rear direction. The length of the second auxiliary reinforcing ribs (123) is in the up-down direction. Multiple second auxiliary reinforcing ribs (123) all intersect with the second reinforcing rib plate (120), and multiple second auxiliary reinforcing ribs (123) all intersect with the third reinforcing rib plate (121).

10. The rear frame connecting member according to claim 9, characterized in that: At least part of the intersections of the first reinforcing ribs (114) and the first reinforcing rib plate (119), at least part of the intersections of the first auxiliary reinforcing ribs (122) and the first reinforcing rib plate (119), at least part of the intersections of the second reinforcing ribs (115) and the second reinforcing rib plate (120), at least part of the intersections of the second auxiliary reinforcing ribs (123) and the second reinforcing rib plate (120), and at least part of the intersections of the second auxiliary reinforcing ribs (123) and the third reinforcing rib plate (121) are provided with demolding ejector pins (127).

11. The rear frame connecting member according to claim 1, characterized in that: On the sill side beam connecting part (101), there are multiple riveting holes (124) penetrating in the inner-outer direction and multiple bolt mounting bosses (125) protruding inward from the sill side beam connecting part (101).

12. The rear frame connecting member according to any one of claims 1-11, characterized in that: On the main body of the aluminum alloy casting, there are multiple rear floor crossbeam lapping cavities (126) opening inward.

13. An installation structure of a rear floor assembly, characterized in that: It includes a rear floor assembly (200) and two rear frame connectors as described in any one of claims 1-12, and the two rear frame connectors are symmetrically arranged on the left and right sides of the rear floor assembly (200).

14. A vehicle, characterized in that: It includes a rear floor assembly mounting structure as described in claim 13.

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