Steel-aluminum composite rear frame and automobile

Abstract

The present invention provides a steel-aluminum composite rear frame and automobile, and relates to the technical field of automobile chassis. The steel-aluminum composite rear frame includes a base frame and a reinforcement frame, wherein the base frame includes an integrally formed front crossbeam, a rear crossbeam, a left longitudinal beam and a right longitudinal beam; the reinforcement frame includes a left reinforcement bracket, a right reinforcement bracket and a reinforcement crossbeam, wherein the base frame is an aluminum alloy frame, and the reinforcement frame is a steel frame. Compared with the prior art, the present invention uses an aluminum alloy material as the base frame and cooperates with a steel reinforcement frame. Compared with the traditional steel rear frame, the weight is reduced and lightweight is achieved. At the same time, the overall rigidity is greatly improved by strengthening the crossbeam, and the modal is improved. There is no need to use a hollow thin-walled aluminum alloy structure, and there is no need to use sand core molding, which greatly reduces the difficulty of the processing technology, is conducive to improving production efficiency, and reduces production costs.

Description

Technical Field

[0001] The invention relates to the technical field of automobile chassis, and in particular to a steel-aluminum composite rear frame and an automobile. Background Art

[0002] The rear subframe is an important component in the chassis system of the car. It is mainly used to provide installation support for the rear suspension system, while blocking the vibration and noise transmitted from the tires to the suspension system, and improving the ride comfort of the whole vehicle. Secondly, the rear subframe is a component that ensures the assembly relationship between the rear suspension system and the body. The rear suspension system and the rear subframe are first assembled on the subassembly line to form the rear axle assembly, and then the assembly is assembled with the body. This assembly structure is easy to install and has high versatility, which reduces assembly and R&D costs and improves the car's maneuverability and comfort.

[0003] In the prior art, the rear subframe is generally a frame structure composed of a crossbeam and a longitudinal beam, on which there are mounting brackets for assembling components such as stabilizer bars, suspension systems, and toe-in. In the design of rear subframe products, its manufacturing processability and cost are also key indicators. Traditional rear subframes are mainly made of steel, which has high rigidity but heavy weight. Under the current trend of lightweight automobile development, aluminum alloy subframes have gradually become the mainstream due to their advantages of low density, light weight, high strength, and good load-bearing capacity. However, the raw material price of aluminum alloy rear subframes is higher, and in order to meet the requirements of strength and performance, it is generally a hollow thin-walled structure, and sand core molding is required inside, which greatly increases the process and raw material costs compared to traditional steel rear subframes. Summary of the invention

[0004] The objectives of the present invention include, for example, providing a steel-aluminum composite rear frame and a car, which can be lightweight compared to a traditional steel rear frame, and the structural strength meets the requirements, does not require a hollow thin-walled aluminum alloy structure, does not require sand core molding, greatly reduces the difficulty of the processing technology, and is conducive to improving production efficiency and reducing production costs.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a steel-aluminum composite rear frame, comprising:

[0007] A base frame, the base frame comprising an integrally formed front cross beam, a rear cross beam, a left longitudinal beam and a right longitudinal beam, the front cross beam and the rear cross beam are arranged opposite to each other, two ends of the left longitudinal beam are respectively connected to the left end of the front cross beam and the left end of the rear cross beam, and two ends of the right longitudinal beam are respectively connected to the right end of the front cross beam and the right end of the rear cross beam;

[0008] A reinforcement frame, the reinforcement frame comprising a left reinforcement bracket, a right reinforcement bracket and a reinforcement cross beam, the bottom end of the left reinforcement bracket is connected to the middle part of the left longitudinal beam, the bottom end of the right reinforcement bracket is connected to the middle part of the right longitudinal beam, and the two ends of the reinforcement cross beam are respectively connected to the left reinforcement bracket and the right reinforcement bracket;

[0009] Wherein, the base frame is an aluminum alloy frame, the reinforcement frame is a steel frame, and the structural strength of the reinforcement frame is greater than the structural strength of the base frame.

[0010] In an optional embodiment, both ends of the front cross beam are integrally provided with a first body suspension mounting arm extending outward, and the first body suspension mounting arm is provided with a first mounting sleeve for mounting the body suspension at one end away from the front cross beam, and the two side edges of the first body suspension mounting arm are also provided with reinforcing flanges, and the reinforcing flanges extend from the front cross beam to the first mounting sleeve, and the two side surfaces of the first body suspension mounting arm are also provided with a plurality of first reinforcing ribs, and the two ends of each of the first reinforcing ribs are respectively connected to the reinforcing flanges on both sides.

[0011] In an optional embodiment, a left mounting platform is provided in the middle portion of the left longitudinal beam, a first connecting member is provided at the bottom of the left reinforcing bracket, and the first connecting member is detachably connected to the left mounting platform so that the left reinforcing bracket is fixed on the left mounting platform; a right mounting platform is provided in the middle portion of the right longitudinal beam, a second connecting member is provided at the bottom of the right reinforcing bracket, and the second connecting member is detachably connected to the right mounting platform so that the right reinforcing bracket is fixed on the right mounting platform.

[0012] In an optional embodiment, the end of the left longitudinal beam away from the rear cross beam and the end of the right longitudinal beam away from the rear cross beam are both provided with stabilizing link mounting ears, the middle portions of the left longitudinal beam and the right longitudinal beam are both bent and provided with stabilizing link mounting ears, the stabilizing link mounting ear located in the middle portion of the left longitudinal beam is adjacent to the left mounting platform and is staggered, and the stabilizing link mounting ear located in the middle portion of the right longitudinal beam is adjacent to the right mounting platform and is staggered.

[0013] In an optional embodiment, a second mounting sleeve is formed at one end of the left longitudinal beam away from the front cross beam and at one end of the right longitudinal beam away from the front cross beam, the second mounting sleeve is used to install the motor suspension and is connected to the rear cross beam, and the axial direction of the first mounting sleeve is perpendicular to the axial direction of the second mounting sleeve.

[0014] In an optional embodiment, both ends of the rear cross beam are integrally provided with a second body suspension mounting arm extending outward, the end of the second body suspension mounting arm away from the rear cross beam is provided with a third mounting sleeve for installing the body suspension, the second body suspension mounting arm is also provided with a second reinforcing rib, and both ends of the rear cross beam are also protruding with a structural reinforcement platform.

[0015] In an optional embodiment, the reinforcement frame also includes a first reinforcement diagonal brace and a second reinforcement diagonal brace, one end of the first reinforcement diagonal brace is connected to the left reinforcement bracket, and the other end is connected to the rear cross beam, one end of the second reinforcement diagonal brace is connected to the right reinforcement bracket, and the other end is connected to the rear cross beam, and the distance between the connection points of the first reinforcement diagonal brace and the second reinforcement diagonal brace on the rear cross beam is smaller than the distance between the left reinforcement bracket and the right reinforcement.

[0016] In an optional embodiment, the cross-sections of the left reinforcing bracket and the right reinforcing bracket are both U-shaped, the ends of the first reinforcing diagonal brace and the second reinforcing diagonal brace are respectively welded or screwed to the side walls of the left reinforcing bracket and the right reinforcing bracket, and the two ends of the reinforcing cross beam are respectively welded or screwed to one end of the left reinforcing bracket away from the left longitudinal beam and one end of the right reinforcing bracket away from the right longitudinal beam.

[0017] In an optional embodiment, the reinforcing cross beam is a variable cross-section structure, a first connecting plate is provided at one end of the left reinforcing bracket away from the left longitudinal beam, and a second connecting plate is provided at one end of the right reinforcing bracket away from the right longitudinal beam, the first connecting plate is welded or screwed to one end of the reinforcing cross beam, and the second connecting plate is welded or screwed to the other end of the reinforcing cross beam.

[0018] In a second aspect, the present invention provides an automobile, comprising a vehicle body and a steel-aluminum composite frame as described in any one of the aforementioned embodiments, wherein the steel-aluminum composite frame is arranged on the bottom rear side of the vehicle body.

[0019] The beneficial effects of the embodiments of the present invention include, for example:

[0020] The steel-aluminum composite rear frame and automobile provided in the embodiment of the present invention adopt an aluminum alloy frame as a base frame, specifically adopts a front crossbeam, a rear crossbeam, a left longitudinal beam and a right longitudinal beam that are integrally formed and form a frame structure, and at the same time, a steel frame is added as a reinforcement frame, the bottom end of the left reinforcement bracket of the reinforcement frame is connected to the middle of the left longitudinal beam, the bottom end of the right reinforcement bracket is connected to the middle of the right longitudinal beam, and the two ends of the reinforcement beam are respectively connected to the left reinforcement bracket and the right reinforcement bracket. Since the structural strength of the reinforcement frame is better, the structural strength of the overall rear frame can be improved. Compared with the prior art, the embodiment of the present invention uses an aluminum alloy material as a base frame and cooperates with a steel reinforcement frame. Compared with the traditional steel rear frame, the weight is reduced and lightweight is achieved. At the same time, the overall stiffness is greatly improved by strengthening the crossbeam, and the modal is improved. The strength requirement of the base frame is lower than that of a pure aluminum alloy frame. Therefore, a solid base frame integrally formed can be used, and there is no need to use an aluminum alloy structure with a hollow thin-walled structure, and there is no need to use sand core molding, which greatly reduces the difficulty of the processing technology, is conducive to improving production efficiency, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a steel-aluminum composite rear frame provided by an embodiment of the present invention at a first viewing angle;

[0023] Figure 2 A schematic diagram of the structure of the steel-aluminum composite rear frame provided by an embodiment of the present invention at a second viewing angle;

[0024] Figure 3 for Figure 1 Schematic diagram of the structure of the middle base frame;

[0025] Figure 4 for Figure 1 A schematic diagram of the structure of the middle reinforcement frame in the first perspective;

[0026] Figure 5 for Figure 1 Schematic diagram of the structure of the middle reinforcement frame at the second viewing angle;

[0027] Figure 6 for Figure 5 Schematic diagram of the structure of the middle left reinforcement bracket.

[0028] Icons: 100-steel-aluminum composite rear frame; 110-base frame; 111-front crossbeam; 112-rear crossbeam; 113-left longitudinal beam; 1131-left mounting platform; 114-right longitudinal beam; 1141-right mounting platform; 115-second mounting sleeve; 120-first body suspension mounting arm; 121-first mounting sleeve; 122-reinforced flange; 123-first reinforcing rib; 130-reinforced frame; 131-left reinforcing bracket; 1311-first connecting piece; 1312-first mounting hole; 132-right reinforcing bracket; 1321-second connecting piece Connector; 133-reinforced crossbeam; 1331-second mounting hole; 134-first reinforcing diagonal brace; 135-second reinforcing diagonal brace; 136-first side panel; 1361-first bending plate; 137-second side panel; 1371-second bending plate; 138-third side panel; 1381-third bending plate; 139-connecting seat; 1391-connecting hole; 140-stabilizing link mounting ear; 150-stabilizing bar mounting ear; 160-second body suspension mounting arm; 161-third mounting sleeve; 163-structural reinforcement platform; 164-second reinforcing rib. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0034] As disclosed in the background technology, the rear subframe of automobiles in the prior art usually adopts a steel rear subframe, which has high rigidity, but is heavy and prone to large-scale corrosion. Therefore, a pure aluminum alloy rear subframe has been further developed, which greatly reduces the weight and is more resistant to corrosion. However, since the strength of aluminum alloy itself is relatively low and the material cost is high, in order to meet the requirements of strength and performance, a hollow thin-walled structure is generally adopted, which results in the need for internal sand core molding during preparation, which greatly increases the process and raw material costs compared to the traditional steel rear subframe, and affects the production efficiency.

[0035] In order to solve the above problems, the embodiments of the present invention provide a novel steel-aluminum composite rear frame and a car. It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0036] Please refer to Figures 1 to 6 The present embodiment provides a novel steel-aluminum composite rear frame 100 and a car, which can achieve lightweight compared to a traditional steel rear frame, and the structural strength meets the requirements, and there is no need to adopt a hollow thin-walled aluminum alloy structure. The structure is simple and does not require sand core molding, which greatly reduces the difficulty of the processing technology, is easy to prepare, and is conducive to improving production efficiency and reducing production costs.

[0037] The present embodiment provides a steel-aluminum composite rear frame 100, including a base frame 110 and a reinforcement frame 130. The base frame 110 includes an integrally formed front cross beam 111, a rear cross beam 112, a left longitudinal beam 113, and a right longitudinal beam 114. The front cross beam 111 and the rear cross beam 112 are arranged opposite to each other. The two ends of the left longitudinal beam 113 are respectively connected to the left end of the front cross beam 111 and the left end of the rear cross beam 112. The two ends of the right longitudinal beam 114 are respectively connected to the right end of the front cross beam 111 and the right end of the rear cross beam 112. The frame 130 includes a left reinforcing bracket 131, a right reinforcing bracket 132 and a reinforcing cross beam 133, the bottom end of the left reinforcing bracket 131 is connected to the middle of the left longitudinal beam 113, the bottom end of the right reinforcing bracket 132 is connected to the middle of the right longitudinal beam 114, and the two ends of the reinforcing cross beam 133 are respectively connected to the left reinforcing bracket 131 and the right reinforcing bracket 132; wherein, the base frame 110 is an aluminum alloy frame, the reinforcing frame 130 is a steel frame, and the structural strength of the reinforcing frame 130 is greater than the structural strength of the base frame 110.

[0038] It should be noted that the steel-aluminum composite rear frame 100 provided in the present embodiment adopts an aluminum alloy frame as the base frame 110, and specifically adopts a front cross beam 111, a rear cross beam 112, a left longitudinal beam 113 and a right longitudinal beam 114 which are integrally formed to form a frame structure, and at the same time, a steel frame is added as a reinforcement frame 130, and the bottom end of the left reinforcement bracket 131 of the reinforcement frame 130 is connected to the middle of the left longitudinal beam 113, and the bottom end of the right reinforcement bracket 132 is connected to the middle of the right longitudinal beam 114, and the two ends of the reinforcement cross beam 133 are respectively connected to the left reinforcement bracket 131 and the right reinforcement bracket 132. Since the structural strength of the reinforcement frame 130 is better, the structural strength of the overall rear frame can be improved.

[0039] In this embodiment, both ends of the front cross beam 111 are integrally provided with first vehicle body suspension mounting arms 120 extending outward, and one end of the first vehicle body suspension mounting arm 120 away from the front cross beam 111 is provided with a first mounting sleeve 121 for mounting the vehicle body suspension, and both side edges of the first vehicle body suspension mounting arm 120 are also provided with reinforcing flanges 122, which extend from the front cross beam 111 to the first mounting sleeve 121, and both side surfaces of the first vehicle body suspension mounting arm 120 are also provided with a plurality of first reinforcing ribs 123, and both ends of each first reinforcing rib 123 are respectively connected to the reinforcing flanges 122 on both sides. Specifically, the axial directions of the two first mounting sleeves 121 are both along the vertical direction.

[0040] It should be noted that the first body suspension mounting arm 120 extends outward in an outward-facing O-shape, and the body suspension is fixedly mounted by a first mounting sleeve 121, wherein the first body suspension mounting arm 120 extends outward in a curved shape, which may affect the structural strength of the mounting arm itself. Therefore, reinforcing flanges 122 are integrally provided on both side edges of the first body suspension mounting arm 120 along the width direction, which can greatly enhance the structural strength of the first body suspension mounting arm 120 and ensure the supporting effect.

[0041] It is worth noting that in this embodiment, multiple first reinforcing ribs 123 are distributed in a continuously bent shape on the surface of the first vehicle body suspension mounting arm 120, and two adjacent first reinforcing ribs 123 are in a V-shaped structure, and form a stable triangular structure with the reinforcing flange 122, which greatly improves the structural stability and structural strength.

[0042] In this embodiment, a left mounting platform 1131 is provided in the middle of the left longitudinal beam 113, and a first connecting member is provided at the bottom of the left reinforcing bracket 131, which is detachably connected to the left mounting platform 1131, so that the left reinforcing bracket 131 is fixed on the left mounting platform 1131; a right mounting platform 1141 is provided in the middle of the right longitudinal beam 114, and a second connecting member is provided at the bottom of the right reinforcing bracket 132, which is detachably connected to the right mounting platform 1141, so that the right reinforcing bracket 132 is fixed on the right mounting platform 1141. Specifically, the first connecting member and the second connecting member are both connecting bolts, and the left reinforcing bracket 131 and the right reinforcing bracket are respectively fixed to the left longitudinal beam 113 and the right longitudinal beam 114 by the connecting bolts, so that the steel and aluminum alloy materials can be firmly connected and provide a good fixing effect.

[0043] In this embodiment, a stabilizer link mounting lug 140 is provided at one end of the left longitudinal beam 113 away from the rear cross beam 112 and at one end of the right longitudinal beam 114 away from the rear cross beam 112. The middle parts of the left longitudinal beam 113 and the right longitudinal beam 114 are bent and provided with stabilizer bar mounting lugs 150. The stabilizer bar mounting lug 150 located in the middle of the left longitudinal beam 113 is adjacent to the left mounting platform 1131 and is staggered. The stabilizer bar mounting lug 150 located in the middle of the right longitudinal beam 114 is adjacent to the right mounting platform 1141 and is staggered.

[0044] In this embodiment, the end of the left longitudinal beam 113 away from the front cross beam 111 and the end of the right longitudinal beam 114 away from the front cross beam 111 are both formed with a second mounting sleeve 115, which is used to mount the motor suspension and is connected to the rear cross beam 112, and the axial direction of the first mounting sleeve 121 is perpendicular to the axial direction of the second mounting sleeve 115. Specifically, the axial direction of the second mounting sleeve 115 is along the horizontal direction, and the second mounting sleeve 115 itself also plays the role of a structural member, which is integrally connected to the rear cross beam 112.

[0045] In this embodiment, both ends of the rear cross beam 112 are integrally provided with a second vehicle body suspension mounting arm 160 extending outward, and one end of the second vehicle body suspension mounting arm 160 away from the rear cross beam 112 is provided with a third mounting sleeve 161 for mounting the vehicle body suspension, and the second vehicle body suspension mounting arm 160 is also provided with a second reinforcing rib 164, and both ends of the rear cross beam 112 are also convexly provided with a structural reinforcement platform 163. Specifically, the second reinforcing rib 164 is provided on the bottom surface of the second vehicle body suspension mounting arm 160, which can strengthen the structural strength of the second vehicle body suspension mounting arm 160. Among them, the axial direction of the third mounting sleeve 161 is along the vertical direction, and the third mounting sleeve 161 is flush with the first mounting sleeve 121, so that the vehicle body suspension can be installed more smoothly. In addition, the provision of the structural reinforcement platform 163 can, on the one hand, further increase the edge structural strength of the rear cross beam 112, and on the other hand, can install other connecting structural members, such as a tie rod, etc. Preferably, a screw hole is provided on the structural reinforcement platform 163 to facilitate structural connection.

[0046] Further, the reinforcement frame 130 further includes a first reinforcement brace 134 and a second reinforcement brace 135, one end of the first reinforcement brace 134 is connected to the left reinforcement bracket 131, and the other end is connected to the rear cross beam 112, one end of the second reinforcement brace 135 is connected to the right reinforcement bracket 132, and the other end is connected to the rear cross beam 112, and the distance between the connection points of the first reinforcement brace 134 and the second reinforcement brace 135 on the rear cross beam 112 is less than the distance between the left reinforcement bracket 131 and the right reinforcement. Specifically, the first reinforcement brace 134 is arranged at an angle with the left reinforcement bracket 131, and the first reinforcement brace 134, the rear cross beam 112 and the left longitudinal beam 113 form a stable triangular support structure in the horizontal direction, thereby greatly improving the overall structural strength. In addition, the second reinforcement brace 135 is arranged at an angle with the right reinforcement bracket 132, and the second reinforcement brace 135, the rear cross beam 112 and the right longitudinal beam 114 form a stable triangular support structure in the horizontal direction, thereby greatly improving the overall structural strength.

[0047] It should be noted that in this embodiment, the first and second reinforcing diagonal braces 134 and 135 are symmetrically arranged to make the left and right forces more uniform, and one end of the first and second reinforcing diagonal braces 134 and 135 are respectively welded or screwed to the left reinforcing bracket 131 and the right reinforcing bracket 132, and the other ends can also be welded or bolted to the rear cross beam 112. In addition, the cross-sections of the first and second reinforcing diagonal braces 134 and 135 are both U-shaped, which can improve their own structural strength.

[0048] In this embodiment, the cross-sections of the left reinforcing bracket 131 and the right reinforcing bracket 132 are both U-shaped, the ends of the first reinforcing diagonal brace 134 and the second reinforcing diagonal brace 135 are respectively welded or screwed to the side walls of the left reinforcing bracket 131 and the right reinforcing bracket 132, and the two ends of the reinforcing cross beam 133 are respectively welded or screwed to the end of the left reinforcing bracket 131 away from the left longitudinal beam 113 and the end of the right reinforcing bracket 132 away from the right longitudinal beam 114.

[0049] In this embodiment, the reinforcing cross beam 133 is a variable cross-section structure. A first connecting piece 1311 is provided at one end of the left reinforcing bracket 131 away from the left longitudinal beam 113, and a second connecting piece 1321 is provided at one end of the right reinforcing bracket 132 away from the right longitudinal beam 114. The first connecting piece 1311 is welded or screwed to one end of the reinforcing cross beam 133, and the second connecting piece 1321 is welded or screwed to the other end of the reinforcing cross beam 133. Specifically, the first connecting piece 1311 and the second connecting piece 1321 have the same structure. The first connecting piece 1311 is integrally provided at the top of the left reinforcing bracket 131 and extends toward the right reinforcing bracket 132, thereby forming a bearing structure. When actually welding the reinforcing cross beam 133, the reinforcing cross beam 133 can be directly placed on the first connecting piece 1311, and the reinforcing cross beam 133 is welded between the left reinforcing bracket 131 and between the reinforcing cross beam 133 and the first connecting piece 1311, so as to improve the overall welding and fixing effect, and facilitate positioning during welding. The structure of the second connecting piece 1321 may refer to the first connecting piece 1311 .

[0050] It is worth noting that the end of the first connecting piece 1311 is also provided with a first mounting hole 1312, and the reinforcing crossbeam 133 is also correspondingly provided with a second mounting hole 1331, and the second mounting hole 1331 is equipped with a positioning piece, and the positioning piece is assembled in the first mounting hole 1312, so as to realize the pre-fixation between the first connecting piece 1311 and the reinforcing crossbeam 133. The positioning piece can be a bolt or a rivet. During the actual welding, the reinforcing crossbeam 133 can be placed on the first connecting piece 1311 first, and the positioning piece can be inserted after the first mounting hole 1312 and the second mounting hole 1331 are aligned, so that the reinforcing crossbeam 133 and the first connecting piece 1311 are kept pre-fixed, and the reinforcing crossbeam 133 can be supported on the side wall of the left mounting bracket, and then welding is performed to ensure the flatness of the weld and the stability of the welding structure. In addition, after welding, the setting of the positioning piece can also enhance the strength of the connection structure between the reinforcing crossbeam 133 and the first connecting piece 1311 in the horizontal direction, withstand part of the horizontal moment, and avoid the situation of desoldering.

[0051] It should be noted that the left reinforcing bracket 131 and the right reinforcing bracket 132 in this embodiment have the same structure, and the left reinforcing bracket 131 is taken as an example to describe its specific structure in detail. Further, the left reinforcing bracket 131 includes an integrally formed first side plate 136, a second side plate 137 and a third side plate 138, wherein the first side plate 136 and the second side plate 137 are respectively provided at the front and rear edges of the third side plate 138, and form a U-shaped structure, and the first reinforcing diagonal brace 134 is welded or screwed at the connection between the third side plate 138 and the second side plate 137, so that the third side plate 138 and the second side plate 137 can be simultaneously applied with force, and the structural stability is better. Moreover, the left reinforcing bracket 131 with a U-shaped structure can further improve its structural strength.

[0052] In this embodiment, a first bent plate 1361 is formed at the bottom of the first side panel 136 and is bent toward the second side panel 137. A second bent plate 1371 is formed at the bottom of the second side panel 137 and is bent toward the first side panel 136. A third bent plate 1381 is formed at the bottom of the third side panel 138 and is bent away from the right reinforcing bracket 132. The first bent plate 1361, the second bent plate 1371 and the third bent plate 1381 are stacked and placed together on the left mounting platform 1131 of the left longitudinal beam 113. The second bending plate 1371 is located on the upper side of the first bending plate 1361, and the third bending plate 1381 is located on the upper side of the second bending plate 1371. The third bending plate 1381 is provided with a connecting seat 139, and a connecting hole 1391 is penetrated through the connecting seat 139. A connecting bolt is installed in the connecting hole 1391. A corresponding screw hole is opened on the left mounting platform 1131. The connecting bolt passes through the connecting hole 1391, the third bending plate 1381, the second bending plate 1371 and the first bending plate 1361 in sequence and is installed in the corresponding screw hole to fix the left reinforcing bracket 131.

[0053] It should be noted that two screw holes are provided on the left mounting platform 1131, and two connecting seats 139 are provided on the third bending plate 1381. Both connecting seats 139 are in the shape of rectangular tables, and are in a movable connection structure with the third bending plate 1381. The connecting hole 1391 on the connecting seat 139 can be a countersunk structure, and the spacing between the two screw holes is small, so that the gap between the two connecting seats 139 is smaller than the edge width of the connecting seat 139. After the connecting bolt is locked in place, the two connecting seats 139 also remain fixed. In addition, after the connecting bolt is tightened, the nut part of the connecting bolt can be welded to the connecting seat 139, so that the connecting bolt and the connecting seat 139 can remain relatively fixed, and a self-locking structure can be formed between the two connecting seats 139, which can prevent the connecting bolt from being loosened significantly and ensure the stability of the connecting structure.

[0054] An embodiment of the present invention further provides an automobile, comprising a vehicle body and a steel-aluminum composite frame, wherein the steel-aluminum composite frame is arranged at the bottom rear side of the vehicle body.

[0055] In summary, the steel-aluminum composite rear frame 100 and the automobile provided in the embodiment of the present invention adopt an aluminum alloy frame as the base frame 110, and specifically adopt a front cross beam 111, a rear cross beam 112, a left longitudinal beam 113 and a right longitudinal beam 114 that are integrally formed and form a frame structure, and at the same time, a steel frame is added as a reinforcement frame 130, and the bottom end of the left reinforcement bracket 131 of the reinforcement frame 130 is connected to the middle of the left longitudinal beam 113, and the bottom end of the right reinforcement bracket 132 is connected to the middle of the right longitudinal beam 114, and the two ends of the reinforcement cross beam 133 are respectively connected to the left reinforcement bracket 131 and the right reinforcement bracket 132. Since the structural strength of the reinforcement frame 130 is better, the structural strength of the overall rear frame can be improved. Compared with the prior art, the embodiment of the present invention uses an aluminum alloy material as the base frame 110, which is matched with a steel reinforcement frame 130. Compared with the traditional steel rear frame, the weight is reduced and lightweight is achieved. At the same time, the overall stiffness is greatly improved and the modal is improved by strengthening the cross beam 133. The strength requirement of the base frame 110 is lower than that of a pure aluminum alloy frame. Therefore, an integrally formed solid base frame 110 can be used. There is no need to use a hollow thin-walled aluminum alloy structure, and there is no need to use sand core molding, which greatly reduces the difficulty of the processing technology, is conducive to improving production efficiency, and reducing production costs.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A steel-aluminum composite rear frame, characterized in that: include: A base frame, the base frame comprising an integrally formed front cross beam, a rear cross beam, a left longitudinal beam and a right longitudinal beam, the front cross beam and the rear cross beam are arranged opposite to each other, two ends of the left longitudinal beam are respectively connected to the left end of the front cross beam and the left end of the rear cross beam, and two ends of the right longitudinal beam are respectively connected to the right end of the front cross beam and the right end of the rear cross beam; A reinforcement frame, the reinforcement frame comprising a left reinforcement bracket, a right reinforcement bracket and a reinforcement cross beam, the bottom end of the left reinforcement bracket is connected to the middle part of the left longitudinal beam, the bottom end of the right reinforcement bracket is connected to the middle part of the right longitudinal beam, and the two ends of the reinforcement cross beam are respectively connected to the left reinforcement bracket and the right reinforcement bracket; Wherein, the base frame is an aluminum alloy frame, the reinforcement frame is a steel frame, and the structural strength of the reinforcement frame is greater than the structural strength of the base frame; The reinforcement frame further includes a first reinforcement diagonal brace and a second reinforcement diagonal brace, one end of the first reinforcement diagonal brace is connected to the left reinforcement bracket, and the other end is connected to the rear cross beam, one end of the second reinforcement diagonal brace is connected to the right reinforcement bracket, and the other end is connected to the rear cross beam, and the distance between the connection points of the first reinforcement diagonal brace and the second reinforcement diagonal brace on the rear cross beam is smaller than the distance between the left reinforcement bracket and the right reinforcement bracket; The first reinforcing diagonal brace is arranged at an angle with the left reinforcing bracket, the second reinforcing diagonal brace is arranged at an angle with the right reinforcing bracket, the first reinforcing diagonal brace and the second reinforcing diagonal brace are arranged symmetrically, and the first reinforcing diagonal brace, the rear cross beam and the left longitudinal beam form a stable triangular support structure in the horizontal direction; the second reinforcing diagonal brace, the rear cross beam and the right longitudinal beam form a stable triangular support structure in the horizontal direction; The left reinforcing bracket comprises a first side panel, a second side panel and a third side panel, wherein the first side panel and the second side panel are respectively provided with front and rear side edges of the third side panel to form a U-shaped structure, the first reinforcing diagonal brace is welded or screwed at the connection between the third side panel and the second side panel, a first bent plate is formed at the bottom of the first side panel, and a second bent plate is formed at the bottom of the second side panel, and a third bent plate is formed at the bottom of the third side panel, which is bent towards and away from the right reinforcing bracket, the first bent plate, the second bent plate and the third bent plate are stacked and arranged, and two connecting seats are also provided on the third bent plate, both of which are rectangular table-shaped, and the connecting seats are provided with connecting holes, and connecting bolts are installed in the connecting holes, and the connecting bolts pass through the connecting hole, the third bent plate, the second bent plate and the first bent plate in sequence and are correspondingly installed in the connecting hole, and the gap between the two connecting seats is smaller than the edge width of the connecting seat.

2. The steel-aluminum composite rear frame according to claim 1, characterized in that: Both ends of the front cross beam are integrally provided with a first body suspension mounting arm extending outward, and the first body suspension mounting arm is provided with a first mounting sleeve for mounting the body suspension at one end away from the front cross beam, and the two side edges of the first body suspension mounting arm are also provided with reinforcing flanges, and the reinforcing flanges extend from the front cross beam to the first mounting sleeve, and the two side surfaces of the first body suspension mounting arm are also provided with a plurality of first reinforcing ribs, and the two ends of each of the first reinforcing ribs are respectively connected to the reinforcing flanges on both sides.

3. The steel-aluminum composite rear frame according to claim 2, characterized in that: A left mounting platform is provided in the middle of the left longitudinal beam, and a first connecting member is provided at the bottom of the left reinforcing bracket, and the first connecting member is detachably connected to the left mounting platform so that the left reinforcing bracket is fixed on the left mounting platform; a right mounting platform is provided in the middle of the right longitudinal beam, and a second connecting member is provided at the bottom of the right reinforcing bracket, and the second connecting member is detachably connected to the right mounting platform so that the right reinforcing bracket is fixed on the right mounting platform.

4. The steel-aluminum composite rear frame according to claim 3, characterized in that: The end of the left longitudinal beam away from the rear cross beam and the end of the right longitudinal beam away from the rear cross beam are both provided with stabilizing link mounting ears, the middle parts of the left longitudinal beam and the right longitudinal beam are both bent and provided with stabilizing bar mounting ears, the stabilizing bar mounting ear located in the middle part of the left longitudinal beam is adjacent to the left mounting platform and is staggered, and the stabilizing bar mounting ear located in the middle part of the right longitudinal beam is adjacent to the right mounting platform and is staggered.

5. The steel-aluminum composite rear frame according to claim 3, characterized in that: A second mounting sleeve is formed at one end of the left longitudinal beam away from the front cross beam and at one end of the right longitudinal beam away from the front cross beam. The second mounting sleeve is used to install the motor suspension and is connected to the rear cross beam, and the axial direction of the first mounting sleeve is perpendicular to the axial direction of the second mounting sleeve.

6. The steel-aluminum composite rear frame according to claim 2, characterized in that: Both ends of the rear cross beam are integrally provided with a second body suspension mounting arm extending outward, and an end of the second body suspension mounting arm away from the rear cross beam is provided with a third mounting sleeve for mounting the body suspension, and a second reinforcing rib is also provided on the second body suspension mounting arm, and structural reinforcement platforms are also protrudingly provided at both ends of the rear cross beam.

7. The steel-aluminum composite rear frame according to claim 1, characterized in that: The cross-sections of the left reinforcing bracket and the right reinforcing bracket are both U-shaped, the ends of the first reinforcing diagonal brace and the second reinforcing diagonal brace are respectively welded or screwed to the side walls of the left reinforcing bracket and the right reinforcing bracket, and the two ends of the reinforcing cross beam are respectively welded or screwed to one end of the left reinforcing bracket away from the left longitudinal beam and one end of the right reinforcing bracket away from the right longitudinal beam.

8. The steel-aluminum composite rear frame according to claim 7, characterized in that: The reinforcing cross beam is a variable cross-section structure. A first connecting piece is provided at one end of the left reinforcing bracket away from the left longitudinal beam, and a second connecting piece is provided at one end of the right reinforcing bracket away from the right longitudinal beam. The first connecting piece is welded or screwed to one end of the reinforcing cross beam, and the second connecting piece is welded or screwed to the other end of the reinforcing cross beam.

9. A car, characterized in that: It comprises a vehicle body and a steel-aluminum composite rear frame as described in any one of claims 1 to 8, wherein the steel-aluminum composite rear frame is arranged on the rear side of the bottom of the vehicle body.

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