A subframe and aluminum body connection structure

Abstract

The utility model discloses a connecting structure between a sub-frame and an aluminum body. The body comprises a front longitudinal beam. A connecting bracket is connected between the sub-frame and the front longitudinal beam. The bottom of the connecting bracket is connected to the sub-frame. The top of the connecting bracket is connected to the side of the front longitudinal beam. The connecting bracket comprises a connecting platform. The connecting platform is arranged on the side of the connecting bracket and is connected to the bottom of the front longitudinal beam. By adopting the connecting structure between the sub-frame and the aluminum body of the utility model, the bearing capacity of the sub-frame is reduced, the deviation of the sub-frame is reduced, and the driving safety is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts, and specifically relates to a connecting structure of a subframe and an aluminum body. Background Art

[0002] At present, the car body is divided into steel body and aluminum body. The biggest advantages of steel body parts are: low production cost, mature and reliable production technology, and high strength. However, steel body parts also have a significant disadvantage, which is that they are heavy. For pure electric vehicles, reducing weight can increase the range. Aluminum body is the product of automobile lightweight research. It is lighter than steel body and can increase the vehicle's range, but its strength is somewhat weaker than that of iron body.

[0003] Under a steel body, the subframe is generally connected directly to the body by bolts without the need for additional connecting mechanisms. When it is changed to an aluminum body, the current subframe and body are mostly directly connected without a special connecting structure. When a single connection point is subjected to excessive bearing force that exceeds the upper limit of the aluminum body's strength, it will cause damage to the aluminum body and affect vehicle safety.

[0004] The utility model patent with announcement number CN211252764U was published on August 14, 2020. The name of the connection structure between the subframe and the frame longitudinal beam of a dump truck is disclosed. The connection structure between the subframe and the frame longitudinal beam of the dump truck includes a subframe and a frame longitudinal beam. An upper bracket is provided on the belly surface of the subframe, and a connecting bracket is provided on the belly surface of the frame longitudinal beam. The upper bracket and the connecting bracket are arranged up and down, and the upper bracket and the connecting bracket are a detachable connection structure. The connection structure between the subframe and the frame longitudinal beam of the dump truck cannot reduce the deviation of the subframe and cannot ensure the driving safety of the vehicle. Utility Model Content

[0005] The utility model aims to provide a subframe and aluminum body connection structure which reduces the subframe load-bearing capacity, reduces the subframe offset and ensures driving safety in view of the deficiencies in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The subframe is connected to an aluminum body structure, the body includes a front longitudinal beam, a connecting bracket is connected between the subframe and the front longitudinal beam, the bottom of the connecting bracket is connected to the subframe, the top of the connecting bracket is connected to the side of the front longitudinal beam, the connecting bracket includes a connecting platform, the connecting platform is arranged on the side of the connecting bracket, and the connecting platform is connected to the bottom of the front longitudinal beam.

[0008] The first and second connecting seats are respectively provided at the two ends of the top of the connecting bracket, the first connecting seat is provided with a first connecting hole in the middle, and the second connecting seat is provided with a second connecting hole in the middle; the third and fourth connecting seats are respectively provided at the middle and end of the connecting platform, the third connecting seat is provided with a third connecting hole in the middle, and the fourth connecting seat is provided with a fourth connecting hole in the middle; the fifth connecting hole is provided in the middle of the bottom end of the connecting bracket.

[0009] The end of the auxiliary frame is fixedly connected with a mounting seat, and the bottom of the connecting bracket is connected to the mounting seat.

[0010] The first connection hole and the second connection hole are located in the same plane, and the third connection hole and the fourth connection hole are located in the same plane.

[0011] The portion of the connecting bracket between the first connecting hole and the second connecting hole is an arc-shaped structure.

[0012] The first connecting seat, the second connecting seat, the third connecting seat, the fourth connecting seat and the mounting seat are all column structures.

[0013] A weight-reducing hole is provided in the middle of the connecting bracket, and two weight-reducing holes are provided.

[0014] The connecting bracket is made of cast iron.

[0015] The technical effect of the utility model is as follows: the subframe and aluminum body connection structure of the utility model is adopted, and a connection bracket is added between the front longitudinal beam of the vehicle body and the subframe, which solves the problem of weak bearing capacity when the traditional single-point connection is adopted, and avoids the damage to the aluminum body caused by excessive bearing capacity, and multiple installation points are set on the connection bracket, which effectively shares the bearing capacity of the subframe, reduces the influence of the subframe being offset, improves the handling stability of the vehicle, and ensures the driving safety of the vehicle with an aluminum body. The connection point on the connection bracket is reasonably designed, easy to install, and has high structural strength and compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification includes the following drawings, which show the following contents:

[0017] Figure 1 It is a structural schematic diagram of the connection structure between the auxiliary frame and the aluminum body of the utility model;

[0018] Figure 2 yes Figure 1 A schematic diagram of the structure from another perspective;

[0019] Figure 3 It is a structural schematic diagram of the connecting bracket of the utility model.

[0020] Markings in the figure are: 1. Subframe; 2. Front longitudinal beam; 3. Connecting bracket; 4. Connecting platform; 5. First connecting seat; 6. Second connecting seat; 7. Third connecting seat; 8. Fourth connecting seat; 9. Mounting seat; 10. Weight reduction hole; 11. First connecting hole; 12. Second connecting hole; 13. Third connecting hole; 14. Fourth connecting hole; 15. Fifth connecting hole. DETAILED DESCRIPTION

[0021] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate their implementation.

[0022] like Figures 1 to 3 As shown, the subframe 1 is connected to the aluminum body structure, the body includes a front longitudinal beam 2, a connecting bracket 3 is connected between the subframe 1 and the front longitudinal beam 2, the bottom of the connecting bracket 3 is connected to the subframe 1, the top of the connecting bracket 3 is connected to the side of the front longitudinal beam 2, the connecting bracket 3 includes a connecting platform 4, the connecting platform 4 is arranged on the side of the connecting bracket 3, and the connecting platform 4 is connected to the bottom of the front longitudinal beam 2.

[0023] The connecting bracket 3 and the aluminum body have four mounting points, and two mounting points are provided on the side and bottom of the front longitudinal beam 2. The connecting bracket 3 is connected to the side of the front longitudinal beam 2 by two bolts, and the connecting platform 4 constitutes a connection point with the bottom of the front longitudinal beam 2 of the connecting bracket 3. The connecting bracket 3 is connected to the bottom of the front longitudinal beam 2 by two bolts, and the bottom end of the connecting bracket 3 is connected to the subframe 1 by bolts, and the connections of various parts of the connecting bracket 3 are all connected by bolts; the connection between the side of the front longitudinal beam 2 and the connecting bracket 3 can limit the influence of the bearing force in the Y direction of the subframe 1 on the displacement during vehicle driving, and the connection between the bottom of the front longitudinal beam 2 and the connecting bracket 3 can reduce the displacement influence caused by the bearing force in the X direction of the subframe 1. Therefore, an additional connecting bracket 3 is provided to connect the front longitudinal beam 2 and the subframe 1, so that the displacement influence of the subframe 1 in the two directions of the X direction and the Y direction of the vehicle body coordinate system is reduced, thereby ensuring driving stability.

[0024] like Figure 3As shown, the first connection seat 5 and the second connection seat 6 are respectively provided at the two ends of the top of the connection bracket 3, the first connection seat 5 is provided with a first connection hole 11 in the middle, and the second connection seat 6 is provided with a second connection hole 12 in the middle; the third connection seat 7 and the fourth connection seat 8 are respectively provided in the middle and end of the connection platform 4, the third connection seat 7 is provided with a third connection hole 13 in the middle, and the fourth connection seat 8 is provided with a fourth connection hole 14 in the middle; the fifth connection hole 15 is provided in the middle of the bottom end of the connection bracket 3. The first connection hole 11, the third connection hole 13 and the fourth connection hole 14 are all round holes that can absorb tolerances; the second connection hole 12 is a waist hole that has a limiting effect: it prevents the parts from moving on the X-axis of the vehicle body coordinate, and can also be used as a positioning hole for installing the connection bracket 3. The fifth connection hole 15 is a threaded hole, and the bolt can directly pass through the hole to connect with the mounting seat 9. The first connection hole 11 and the second connection hole 12 are mounting holes for connecting the connection bracket 3 to the side of the front longitudinal beam 2 of the vehicle body, the third connection hole 13 and the fourth connection hole 14 are mounting holes for connecting the connection bracket 3 to the bottom of the front longitudinal beam 2 of the vehicle body, and the fifth connection hole 15 is a mounting hole for connecting the connection bracket 3 to the subframe 1. The bottom of the connection bracket 3 is a groove-shaped structure and the fifth connection hole 15 is designed to reduce its volume and weight, making its structure compact and not occupying too much space in the vehicle body. The above connection holes are all connected by bolts, and the bolts used are all standard bolts with uniform specifications. In addition, the connection bracket 3 is an integrally formed part, which is more convenient to install.

[0025] like Figure 2 As shown, the end of the subframe 1 is fixedly connected with a mounting seat 9, and the bottom of the connecting bracket 3 is connected to the mounting seat 9. The arrangement of the mounting seat 9 facilitates the bolt to directly extend from the bottom of the mounting seat 9 into the fifth connecting hole 15 to be connected thereto, and the operating space below the mounting seat 9 is large, thereby reducing the difficulty of installation.

[0026] like Figure 3 As shown, the first connection hole 11 and the second connection hole 12 are in the same plane, and the third connection hole 13 and the fourth connection hole 14 are in the same plane. The plane where the first connection hole 11 and the second connection hole 12 are located is parallel to the vertical plane, and the plane where the third connection hole 13 and the fourth connection hole 14 are located is parallel to the horizontal plane. The connection bracket 3 and the front longitudinal beam 2 of the vehicle body are fixed in a two-hole-on-one-plane manner to establish a relative position relationship, which can improve the connection and fixing effect.

[0027] like Figure 1 As shown, the portion between the first connection hole 11 and the second connection hole 12 on the connection bracket 3 is an arc-shaped structure. The top of the connection bracket 3 is an inwardly concave arc-shaped structure, and the transition of this portion is smooth, which can reduce stress concentration, facilitate the conduction and dispersion of stress at the two connection points at the top of the connection bracket 3, and avoid local damage to the connection bracket 3.

[0028] like Figure 3As shown, the first connection seat 5, the second connection seat 6, the third connection seat 7, the fourth connection seat 8 and the mounting seat 9 are all column structures. The above structure is used as the connection point of the bolt. Designing it as a column structure can not only improve the fit between the bolt extrusion surface and the above structure, making the tightening force more uniform, but also reduce the concentration of stress, thereby reducing the deformation caused by the connection seat when the bearing capacity is too large.

[0029] like Figure 3 As shown, a weight-reducing hole 10 is provided in the middle of the connecting bracket 3, and two weight-reducing holes 10 are provided. The weight-reducing holes 10 can reduce the weight of the connecting bracket 3, meeting the design requirements of lightweight trams.

[0030] The connecting bracket 3 is made of cast iron, which has good performance of high strength and rigidity, reliable performance, can fully absorb the bearing capacity of the subframe 1 and the aluminum body, and has low manufacturing cost, stable processing size, and is easy to form in one piece, which can be suitable for batch processing and production of the connecting bracket 3 of this special-shaped structure.

[0031] The design process of the connecting bracket 3 is as follows:

[0032] 1. Calculate the strength value of the aluminum body through CAE analysis;

[0033] 2. Through CAE analysis and road spectrum analysis, the maximum load borne by the connection mechanism under various working conditions is obtained, the location and number of the aluminum body installation points are analyzed and arranged, and suitable bolts are selected;

[0034] 3. Collect the loads of the aluminum body and the subframe 1, optimize the design of the connecting bracket 3 structure, and select appropriate materials to make it have higher strength and rigidity.

[0035] The subframe 1 and the aluminum body connection structure is provided with a connection bracket 3 between the front longitudinal beam 2 of the vehicle body and the subframe 1, which solves the problem of weak bearing capacity when the traditional single-point connection is adopted, avoids the damage to the aluminum body caused by excessive bearing capacity, and multiple installation points are arranged on the connection bracket 3, which effectively shares the bearing capacity of the subframe 1, reduces the influence of the offset of the subframe 1, improves the handling stability of the vehicle, and ensures the driving safety of the vehicle with the aluminum body. The connection point on the connection bracket 3 is reasonably designed, easy to install, and has high structural strength and compact structure.

[0036] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A subframe and aluminum body connection structure, characterized in that: The vehicle body comprises a front longitudinal beam (2); a connecting bracket (3) is connected between the subframe (1) and the front longitudinal beam (2); the bottom of the connecting bracket (3) is connected to the subframe (1); the top of the connecting bracket (3) is connected to the side of the front longitudinal beam (2); the connecting bracket (3) comprises a connecting platform (4); the connecting platform (4) is arranged on the side of the connecting bracket (3); and the connecting platform (4) is connected to the bottom of the front longitudinal beam (2).

2. The subframe and aluminum body connection structure according to claim 1, characterized in that: The connecting bracket (3) is provided with a first connecting seat (5) and a second connecting seat (6) at two ends of the top thereof, the first connecting seat (5) is provided with a first connecting hole (11) in the middle thereof, and the second connecting seat (6) is provided with a second connecting hole (12) in the middle thereof; the connecting platform (4) is provided with a third connecting seat (7) and a fourth connecting seat (8) in the middle thereof, the third connecting seat (7) is provided with a third connecting hole (13) in the middle thereof, and the fourth connecting seat (8) is provided with a fourth connecting hole (14) in the middle thereof; and the connecting bracket (3) is provided with a fifth connecting hole (15) in the middle thereof at the bottom thereof.

3. The subframe and aluminum body connection structure according to claim 2, characterized in that: The end of the auxiliary frame (1) is fixedly connected to a mounting seat (9), and the bottom of the connecting bracket (3) is connected to the mounting seat (9).

4. The subframe and aluminum body connection structure according to claim 2, characterized in that: The first connection hole (11) and the second connection hole (12) are located in the same plane, and the third connection hole (13) and the fourth connection hole (14) are located in the same plane.

5. The subframe and aluminum body connection structure according to claim 4, characterized in that: The portion of the connecting bracket (3) between the first connecting hole (11) and the second connecting hole (12) is an arc-shaped structure.

6. The subframe and aluminum body connection structure according to claim 3, characterized in that: The first connecting seat (5), the second connecting seat (6), the third connecting seat (7), the fourth connecting seat (8) and the mounting seat (9) are all column structures.

7. The subframe and aluminum body connection structure according to claim 1, characterized in that: A weight-reducing hole (10) is provided in the middle of the connecting bracket (3), and two weight-reducing holes (10) are provided.

8. The subframe and aluminum body connection structure according to any one of claims 1 to 7, characterized in that: The connecting bracket (3) is made of cast iron.

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