Rear auxiliary frame structure of automobile

Abstract

The utility model discloses a rear auxiliary frame structure of an automobile, which relates to the field of automobile frames and comprises a front bent pipe beam, a rear bent pipe beam, a rear lower control arm mounting support, a left front pull rod support body and a right front pull rod support body. A left beam upper body, a left beam lower body, a right beam upper body and a right beam lower body are fixed between the front bent pipe beam and the rear bent pipe beam through welding; the front bent pipe beam is fixed with the left beam upper body and the left beam lower body through welding; the front bent pipe beam is fixed with the right beam upper body and the right beam lower body through welding; the rear lower control arm mounting support and the rear bent pipe beam are fixed through welding; the exhaust pipe lifting hook and the front bent pipe beam are fixed through welding; and the bushings are respectively fixed with the front bent pipe beam and the rear bent pipe beam through welding. Under the condition that the suspension system is arranged, the inner space of the auxiliary frame is large, and the auxiliary frame is formed by welding a plurality of low-pressure casting parts and profile extrusion parts. The strength and the rigidity are high, and the good lightweight effect can be achieved under the condition that the strength requirement is met.

Description

Technical Field

[0001] The utility model relates to the field of automobile frames, and specifically relates to a structure of an automobile rear subframe. Background Art

[0002] The subframe is an important component of the suspension system. It provides mounting points for the control arms, stabilizer bars, and powertrain mounts of the suspension, and at the same time transfers the forces of systems such as the ground, suspension system, and power system to the vehicle body. The rear suspension systems of existing passenger cars are generally five-link rear suspensions or trapezoidal arm rear suspensions, and are equipped with air springs to achieve air suspension. However, the air suspension can only improve the ride comfort and handling stability of the whole vehicle to a certain extent. However, it is a passive suspension type and cannot actively adjust its own parameters according to changes in the load mass or road conditions. In addition, for active suspensions, they occupy a large space and sacrifice a certain amount of interior space.

[0003] The subframe can be regarded as the skeleton of the front and rear axles and is a part of the front and rear axles. The subframe is not a complete frame, but only a bracket that supports the front and rear axles and the suspension, enabling the axles and suspension to be connected to the "main frame" through it, and is habitually called the "subframe". The function of the subframe is to block vibration and noise and reduce their direct entry into the carriage, so it mostly appears in luxury cars and off-road vehicles. Some cars also install subframes for the engine.

[0004] With the increasingly strict automobile emission standards, for the design of the rear subframe assembly, in addition to the original stiffness and strength performance requirements, higher requirements are also put forward for the weight target. However, there is a contradiction between the performance requirements and the weight target, thus posing higher requirements for the design of the rear subframe.

[0005] The frame of the rear subframe of traditional fuel vehicle models is relatively small, and the internal space of the subframe is also small (the internal boundary of the subframe of four-wheel drive vehicle models is slightly larger and can accommodate the main reducer), and it cannot accommodate the rear-wheel drive motor; while electric vehicle models mostly adopt five-link suspensions or trapezoidal link suspensions. The above suspension types can provide a relatively large layout space for the motor, but it is relatively rare to arrange the drive motor in the E-type multi-link suspension system. Content of the Utility Model

[0006] The purpose of the utility model is to provide a structure of an automobile rear subframe to solve the problems raised in the above background art.

[0007] To solve the above technical problems, the utility model provides the following technical solution: A structure of an automobile rear subframe, including a front bent pipe beam, a rear bent pipe beam, a rear lower control arm mounting seat, a rear upper control arm seat, a left beam upper body, a left beam lower body, a right beam upper body, a right beam lower body, a left front tie rod support body, a right front tie rod support body, an exhaust pipe hook, and a bushing;

[0008] The front bent pipe beam and the rear bent pipe beam are fixed in the middle by the upper left beam, the lower left beam, the upper right beam, and the lower right beam through welding;

[0009] The front bent pipe beam is strengthened with the upper left beam and the lower left beam through the left front tie rod support body and fixed by welding;

[0010] The front bent pipe beam is strengthened with the upper right beam and the lower right beam through the right front tie rod support body and fixed by welding;

[0011] The rear lower control arm mounting seat and the rear bent pipe beam are fixed by welding;

[0012] The exhaust pipe hook and the front bent pipe beam are fixed by welding;

[0013] The bushings are respectively fixed to the front bent pipe beam and the rear bent pipe beam by welding.

[0014] Preferably, there are 4 bushings in total, which are respectively fixed to the front bent pipe beam and the rear bent pipe beam by welding.

[0015] Preferably, the front bent pipe beam is a hollow circular tube structure with a thickness of 2.5 mm and a diameter of 25 mm.

[0016] Preferably, there are circular holes symmetric about the vehicle's Y-axis in the middle of the front bent pipe beam, and the circular tubes on both sides of the front bent pipe beam are formed into flat structures by stamping.

[0017] Preferably, the rear bent pipe beam is a hollow circular tube structure with a thickness of 2.5 mm and a radius of 25 mm.

[0018] Preferably, there are circular holes symmetric about the vehicle's Y-axis in the middle of the rear bent pipe beam, and the circular tubes on both sides of the rear bent pipe beam are formed into flat structures by stamping.

[0019] Preferably, the thickness of the rear lower control arm mounting seat is 2.5 mm, and there are weight-reducing holes in the middle.

[0020] Preferably, the outer area of the rear lower control arm mounting seat is flanged.

[0021] Preferably, the area around the rear upper control arm support is flanged.

[0022] Compared with the prior art, the beneficial effects of the present utility model are:

[0023] Under the condition of meeting the layout of the suspension system, the subframe of the present utility model has a large internal space and can accommodate the rear-wheel drive motor.

[0024] Lightweight: It is welded by multiple low-pressure castings and profile extrusions; it has high strength and stiffness, and can achieve good lightweight effect while meeting the strength requirements.

[0025] Multi-platform application: The vehicle model described in the present utility model is a platform-based vehicle model, which is divided into fuel models (two-wheel drive, four-wheel drive) and hybrid models (PHEV models, with motors driving the rear wheels). Although the subframe of the hybrid model is newly developed, its interfaces are the same as those of the rear subframe of the fuel model, meeting the requirements of platformization and generalization; in addition, by the strategy of (translating the suspension hard points outward / inward as a whole) + (increasing / reducing the length of the front and rear crossbeam profile segments), the wheelbase can be widened / reduced, so as to achieve the purpose of developing derivative models based on this platform. Description of the Drawings

[0026] Figure 1 is the top view of the present utility model;

[0027] Figure 2 is the right view of the present utility model;

[0028] Figure 3 is the top view of the weld of the present utility model;

[0029] Figure 4 is the front view of the weld of the present utility model. Detailed Embodiment

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] Please refer to Figure 1-2 , this embodiment provides an automotive rear subframe structure, including a front bent pipe beam 1, a rear bent pipe beam 2, a rear lower control arm mounting seat 3, a rear upper control arm seat 4, a left beam upper body 5, a left beam lower body 6, a right beam upper body 7, a right beam lower body 8, a left front tie rod support body 9, a right front tie rod support body 10, an exhaust pipe hook 11, and a bushing 12; the front bent pipe beam 1 and the rear bent pipe beam 2 are fixed in the middle by the left beam upper body 5, the left beam lower body 6, the right beam upper body 7, and the right beam lower body 8 through welding;

[0032] The front bent pipe beam 1 is strengthened with the left beam upper body 5 and the left beam lower body 6 through the left front tie rod support body 9 and fixed by welding;

[0033] The front bent pipe beam 1 is strengthened between the right beam upper body 7 and the right beam lower body 8 through the right front tie rod support body 10 and fixed by welding;

[0034] The rear lower control arm mounting support 3 is fixed to the rear bent pipe beam 2 by welding;

[0035] The exhaust pipe hook 11 is fixed to the front bent pipe beam 1 by welding;

[0036] There are 4 bushings 12 in total, which are respectively fixed to the front bent pipe beam 1 and the rear bent pipe beam 2 by welding;

[0037] The front bent pipe beam 1 is a hollow circular pipe structure with a thickness of 2.5 mm and a diameter of 25 mm. Further, a circular hole symmetrical about the vehicle's Y-axis is left in the middle of the front bent pipe beam 1, which is specially used as a through hole for the electrophoresis liquid to enter and exit the internal cavity during the painting of the pipe beam (no further explanation will be given later). Further, the circular pipes on both sides of the front bent pipe beam 1 are formed into a flat structure by stamping, which is beneficial to suppressing the torsional tendency of the rear subframe assembly and has better passing performance in the face of complex road surfaces or complex working conditions.

[0038] The rear bent pipe beam 2 is a hollow circular pipe structure with a thickness of 2.5 mm and a radius of 25 mm. Further, a circular hole symmetrical about the vehicle's Y-axis is left in the middle of the rear bent pipe beam 2. Further, the circular pipes on both sides of the rear bent pipe beam 2 are formed into a flat structure by stamping, which is beneficial to suppressing the torsional tendency of the rear subframe assembly and has better passing performance in the face of complex road surfaces or complex working conditions.

[0039] The rear lower control arm mounting support 3 has a thickness of 2.5 mm and a weight reduction hole is left in the middle. While ensuring the strength requirements, the weight of the part is minimized as much as possible, which is beneficial to cost control. Further, the outer area of the rear lower control arm mounting support 3 is flanged.

[0040] The rear upper control arm support 4 has a thickness of 3.0 mm and a weight reduction hole is left in the middle. Further, the surrounding area of the rear upper control arm support 4 is flanged. At the same time, a concave feature is added to enhance the local position.

[0041] The left beam upper body 5, the left beam lower body 6, the right beam upper body 7, and the right beam lower body 8 all have a thickness of 2.5 mm and a weight reduction hole is left in the middle. There is a gap between the left beam upper body 5 and the left beam lower body 6, and between the right beam upper body 7 and the right beam lower body 8 for weld connection. Further, the left beam upper body 5 and the left beam lower body 6, and the right beam upper body 7 and the right beam lower body 8 cooperate with each other to form a quadrilateral cavity structure, which can better improve the overall torsional tendency of the rear subframe.

[0042] The thickness of the left front tie rod support body 9 and the right front tie rod support body 10 is 2.5 mm. The middle part is hollowed out to facilitate weight reduction. Flanging and recess features in the surrounding area are beneficial for local strengthening and the process is feasible.

[0043] The bushing 12 is a hollow circular tube structure with a thickness of 3.0 mm and a diameter of 30 mm.

[0044] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automotive rear subframe structure, characterized in that: It includes a front bent pipe beam (1), a rear bent pipe beam (2), a rear lower control arm mounting seat (3), a rear upper control arm seat (4), a left beam upper body (5), a left beam lower body (6), a right beam upper body (7), a right beam lower body (8), a left front tie rod support body (9), a right front tie rod support body (10), an exhaust pipe hook (11), and a bushing (12); The front bent pipe beam (1) and the rear bent pipe beam (2) are fixed in the middle by the left beam upper body (5), the left beam lower body (6), the right beam upper body (7), and the right beam lower body (8) through welding; The front bent pipe beam (1) is strengthened with the left beam upper body (5) and the left beam lower body (6) through the left front tie rod support body (9) and fixed through welding; The front bent pipe beam (1) is strengthened with the right beam upper body (7) and the right beam lower body (8) through the right front tie rod support body (10) and fixed through welding; The rear lower control arm mounting seat (3) is fixed to the rear bent pipe beam (2) through welding; [[ID=o5]]The exhaust pipe hook (11) is fixed to the front bent pipe beam (1) through welding; The bushings (12) are respectively fixed to the front bent pipe beam (1) and the rear bent pipe beam (2) through welding.

2. The automotive rear subframe structure according to claim 1, characterized in that: There are 4 bushings (12) in total, which are respectively fixed to the front bent pipe beam (1) and the rear bent pipe beam (2) through welding.

3. The automotive rear subframe structure according to claim 2, characterized in that: The front bent pipe beam (1) is a hollow circular pipe structure with a thickness of 2.5 mm and a diameter of 25 mm.

4. The automotive rear subframe structure according to claim 3, wherein: There are circular holes symmetric about the vehicle's Y-axis in the middle of the front bent pipe beam (1), and the circular pipes on both sides of the front bent pipe beam (1) are formed into flat structures by stamping.

5. The automotive rear subframe structure according to claim 1, characterized in that: The rear bent pipe beam (2) is a hollow circular pipe structure with a thickness of 2.5 mm and a radius of 25 mm.

6. The automotive rear subframe structure according to claim 5, wherein: There are circular holes symmetric about the vehicle's Y-axis in the middle of the rear bent pipe beam (2), and the circular pipes on both sides of the rear bent pipe beam (2) are formed into flat structures by stamping.

7. The automotive rear subframe structure according to claim 1, characterized in that: The rear lower control arm mounting seat (3) has a thickness of 2.5 mm and has weight-reducing holes in the middle.

8. The automotive rear subframe structure according to claim 7, characterized in that: The outer area of the rear lower control arm mounting seat (3) is flanged.

9. The automotive rear subframe structure according to claim 1, characterized in that: The area around the rear upper control arm seat (4) is flanged.

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