Integral type low-pressure sand core casting aluminum alloy auxiliary frame

Abstract

The utility model provides an integral type low-pressure sand core casting aluminum alloy auxiliary frame which comprises a frame body, the frame body adopts integral sand mold casting, the frame body is of a frame structure shaped like a Chinese character'ri ', the frame structure shaped like the Chinese character'ri' comprises longitudinal beams which are symmetrically arranged, each longitudinal beam is of an L-shaped structure, a front cross beam is arranged between vertical rods of the two L-shaped structures, and a rear cross beam is arranged between the vertical rods of the two L-shaped structures. A middle cross beam and a rear cross beam are sequentially arranged between the cross rods of the two L-shaped structures towards the ends away from the vertical rods; an obliquely-arranged T-shaped structure is arranged at the end, away from the transverse rod, of a vertical rod of the L-shaped structure, the included angle of the L-shaped structure is an arc transition section, the arc transition section is composed of webs of the T-shaped structure, one end of a flange of the T-shaped structure is connected with the front cross beam, first round pipes are arranged at the other end of the flange of the T-shaped structure, and the two first round pipes form a front vehicle body installation point. The integral type low-pressure sand core casting auxiliary frame is adopted, a complex structure can be manufactured under the condition that the performance is met, the interior is hollow, and the weight is reduced to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile aluminum alloy structural parts, and particularly relates to an integral low-pressure sand core casting aluminum alloy subframe. Background Art

[0002] In recent years, due to the prevalence of new energy vehicles, the demand for vehicle lightweighting has been increasing. Aluminum alloy has been widely used in various system structural parts of vehicles due to its high specific strength. Especially in the field of subframes, the application of aluminum alloy is increasing. However, due to the high coefficient of thermal expansion of aluminum alloy material itself (more than twice that of traditional steel), general subframes need to adopt welding and assembly processes, which have the following technical defects: First, a large amount of heat is generated during the welding process, resulting in serious deformation of the subframe and affecting the dimensional accuracy of the product. The installation hard points on the subframe (especially the suspension system installation points) affect the handling performance of the whole vehicle. Therefore, the precision control of the welded subframe assembly has always been a pain point in the industry. Second, welded and assembled subframes often use extruded aluminum profiles. Due to process reasons, extruded profiles cannot be made into complex structures, resulting in more material consumption to meet performance requirements, increasing costs and weight.

[0003] Therefore, how to design an integral low-pressure sand core casting aluminum alloy subframe has become an urgent problem to be solved. Summary of the Utility Model

[0004] Aiming at the problems existing in the prior art, the utility model provides an integral low-pressure sand core casting aluminum alloy subframe to solve at least one of the above technical problems.

[0005] The technical solution of the utility model is: an integral low-pressure sand core casting aluminum alloy subframe, including a frame body. The frame body is integrally sand-cast. The frame body is in a "day" - shaped frame structure. The "day" - shaped frame structure includes symmetrically arranged longitudinal beams. The longitudinal beams are in an L - shaped structure. A front cross beam is arranged between the vertical rods of the two L - shaped structures. A middle cross beam and a rear cross beam are sequentially arranged between the horizontal rods of the two L - shaped structures away from the vertical rods. An inclined T - shaped structure is arranged at the end of the vertical rod of the L - shaped structure away from the horizontal rod. The included angle of the L - shaped structure is an arc transition section, and the arc transition section is formed by the web of the T - shaped structure. One end of the flange of the T - shaped structure is connected to the front cross beam, and a first round tube is arranged at the other end of the flange of the T - shaped structure. The two first round tubes form the front body mounting points.

[0006] The utility model adopts an integral low-pressure sand core casting subframe, which can be made into complex structures while meeting performance requirements. It is hollow inside with a basic wall thickness of 4 mm, minimizing weight to the greatest extent. After integral casting, the installation and assembly surfaces and installation holes are uniformly machined, solving the technical defect that a large amount of heat is generated during the welding process, resulting in serious deformation of the subframe and affecting the dimensional accuracy of the product. Brief Description of the Drawings

[0007] Figure 1 It is a top view of the utility model.

[0008] Figure 2 for Figure 1 AA cross-section diagram.

[0009] Figure 3 for Figure 1 BB cross-section diagram.

[0010] In the figure: 1. Longitudinal beam; 2. Body mounting point; 3. Front cross beam; 4. Front lower control arm bracket; 5. Steering gear mounting point; 6. Rear lower control arm bracket; 7. Stabilizer bar mounting point; 8. Middle cross beam; 9. Rear suspension mounting point; 10. Rear cross beam; 11. Front suspension mounting point. DETAILED DESCRIPTION

[0011] The utility model is further described below in conjunction with the accompanying drawings.

[0012] See also Figure 1-3 The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0013] Embodiment 1: An integral low-pressure sand core cast aluminum alloy subframe, referring to Figure 1 , Figure 2, including a vehicle frame body, which is integrally sand-cast. The vehicle frame body is in a "day"-shaped frame structure. The "day"-shaped frame structure includes longitudinals 1 arranged symmetrically. The longitudinal 1 is in an L-shaped structure. A front crossbeam 3 is arranged between the vertical rods of the two L-shaped structures. A middle crossbeam 8 and a rear crossbeam 10 are successively arranged between the horizontal rods of the two L-shaped structures towards the end far from the vertical rods. An inclined T-shaped structure is arranged at the end of the vertical rod of the L-shaped structure far from the horizontal rod. The included angle of the L-shaped structure is an arc transition section, and the arc transition section is formed by the web of the T-shaped structure. One end of the flange of the T-shaped structure is connected to the front crossbeam 3, and a first round tube is arranged at the other end of the flange of the T-shaped structure. The two first round tubes form a front body mounting point. The vehicle frame body is a hollow structure inside, and the basic wall thickness is 4 mm. The utility model adopts an integral low-pressure sand core casting sub-frame, which can make a complex structure while meeting the performance requirements, is hollow inside, and has a basic wall thickness of 4 mm, minimizing the weight to the greatest extent. After integral casting, the installation and assembly surfaces and installation holes are uniformly machined by machining, solving the technical defect that a large amount of heat is generated during the welding process, resulting in serious deformation of the sub-frame and affecting the dimensional accuracy of the product.

[0014] Embodiment 2: On the basis of Embodiment 1, referring to Figure 3 , tubular structures arranged at intervals are provided on the front crossbeam 3. The front mount mounting points 11 are tubular structures embedded in the front crossbeam 3, and the upper parts of the tubular structures expose the front crossbeam 3. Rear mount mounting points 9 are provided on the rear crossbeam 10. The rear mount mounting points 9 are first ear plates arranged symmetrically, and the two tubular structures are located on both sides of the rear mount mounting points 9. The utility model adopts a tubular structure embedded in the front crossbeam as the front mount mounting point; two first ear plates are adopted to provide an installation clamping surface in the form of a lifting lug as the rear mount mounting point.

[0015] Embodiment 3: On the basis of Embodiment 1, a convex structure is arranged at the end of the horizontal rod of the L-shaped structure far from the vertical rod. The convex structure is inclined and far from the rear crossbeam 10. Second round tubes are arranged on the convex structure. The two second round tubes form a rear body mounting point. The front body mounting point and the rear body mounting point form a body mounting point 2. The utility model adopts two first round tubes and two second round tubes to form a body mounting point for four-point assembly with the body.

[0016] Embodiment 4: On the basis of embodiment 3, the longitudinal beam 1 is provided with a front lower swing arm bracket 4 on the end surface close to the first round tube, and the two front lower swing arm brackets 4 are symmetrically arranged, and the front lower swing arm brackets 4 are second ear plates arranged in parallel; the longitudinal beam 1 is provided with a rear lower swing arm bracket 6 on the end surface close to the second round tube, and the two rear lower swing arm brackets 6 are symmetrically arranged, and the rear lower swing arm brackets 6 are third ear plates arranged in parallel; the two front lower swing arm brackets 4 and the two rear lower swing arm brackets 6 constitute the swing arm mounting point. The utility model adopts two second ear plates to provide the mounting clamping surface of the front lower swing arm in the form of hanging ears; and adopts two third ear plates to provide the mounting clamping surface of the rear lower swing arm in the form of hanging ears.

[0017] Embodiment 5, on the basis of embodiment 4, the top surface of any longitudinal beam 1 is provided with a steering gear mounting point 5 arranged at intervals, and the two steering gear mounting points 5 are respectively close to the front lower swing arm bracket 4 and the rear lower swing arm bracket 6. The steering gear mounting point 5 is a cast circular boss, and the center of the cast circular boss is provided with a first screw hole. The utility model adopts the method of machining the first screw hole on the cast circular boss to provide a steering gear mounting point.

[0018] Embodiment 6: Based on Embodiment 5, a stabilizer bar mounting point 7 is provided between the steering gear mounting points 5 of the two longitudinal beams 1, and the two stabilizer bar mounting points 7 are located on the rear cross beam 10. The stabilizer bar mounting point 7 is a cast waist-shaped boss, and the cast waist-shaped boss is provided with second screw holes arranged at intervals. The utility model adopts the method of machining the second screw hole on the cast waist-shaped boss to provide a stabilizer bar mounting point.

[0019] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An integral low-pressure sand core cast aluminum alloy subframe, comprising a frame body, characterized in that: The frame body is integrally sand-cast. The frame body has a hollow internal structure with a basic wall thickness of 4 mm. The frame body is in a "day"-shaped frame structure, and the "day"-shaped frame structure includes symmetrically arranged longitudinal beams (1). The longitudinal beams (1) are in an L-shaped structure. A front cross beam (3) is arranged between the vertical rods of the two L-shaped structures. A middle cross beam (8) and a rear cross beam (10) are successively arranged between the horizontal rods of the two L-shaped structures towards the end far from the vertical rods. An inclined T-shaped structure is arranged at the end of the vertical rod of the L-shaped structure far from the horizontal rod. The included angle of the L-shaped structure is an arc transition section, and the arc transition section is formed by the web of the T-shaped structure. One end of the flange of the T-shaped structure is connected to the front cross beam (3), and a first round tube is arranged at the other end of the flange of the T-shaped structure. The two first round tubes form a front body mounting point.

2. The integral low-pressure sand core cast aluminum alloy subframe according to claim 1, characterized in that: Spaced front mount points (11) are arranged on the front cross beam (3). The front mount points (11) are tubular structures embedded in the front cross beam (3). Rear mount points (9) are arranged on the rear cross beam (10). The rear mount points (9) are symmetrically arranged first ear plates. The two tubular structures are located on both sides of the rear mount points (9).

3. The integral low-pressure sand core cast aluminum alloy subframe according to claim 1, characterized in that: A convex structure is arranged at the end of the horizontal rod of the L-shaped structure far from the vertical rod. The convex structure is inclined and away from the rear cross beam (10). A second round tube is arranged on the convex structure. The two second round tubes form a rear body mounting point. The front body mounting point and the rear body mounting point form a body mounting point (2).

4. The integral low-pressure sand core cast aluminum alloy subframe according to claim 3, characterized in that: A front lower control arm bracket (4) is arranged on the end face of the longitudinal beam (1) close to the first round tube. The front lower control arm bracket (4) is a second ear plate arranged in parallel. A rear lower control arm bracket (6) is arranged on the end face of the longitudinal beam (1) close to the second round tube. The rear lower control arm bracket (6) is a third ear plate arranged in parallel. The two front lower control arm brackets (4) and the two rear lower control arm brackets (6) form a control arm mounting point.

5. The integral low-pressure sand core cast aluminum alloy subframe according to claim 4, characterized in that: Steering gear mounting points (5) arranged at intervals are arranged on the top surface of any one of the longitudinal beams (1). The two steering gear mounting points (5) are respectively close to the front lower control arm bracket (4) and the rear lower control arm bracket (6). The steering gear mounting points (5) are cast round bosses, and a first screw hole is arranged at the center of the circle of the cast round boss.

6. The integral low-pressure sand core cast aluminum alloy subframe according to claim 5, characterized in that: A stabilizer bar mounting point (7) is arranged between the steering gear mounting points (5) of the two longitudinal beams (1). The two stabilizer bar mounting points (7) are located on the rear cross beam (10). The stabilizer bar mounting points (7) are cast waist-shaped bosses, and spaced second screw holes are arranged on the cast waist-shaped bosses.

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