Frame-type sub-frame structure

Abstract

This invention provides a frame-type subframe structure. It features left front and left center body mounting points on the left longitudinal beam, and right front and right center body mounting points on the right longitudinal beam. A reinforcing plate is positioned between the two lower plates. Left and right rear body mounting points are symmetrically positioned on the two lower plates. The subframe is connected to the vehicle body at six points, connecting the body and suspension, and improving body rigidity. The front subframe also supports the engine, air conditioning compressor, and transmission. The full-frame subframe absorbs some of the impact force during a frontal collision, effectively solving the subframe-body connection problem. Over long-term use, it prevents tearing due to stress concentration and repeated fatigue.

Description

Technical Field

[0001] This invention belongs to the technical field of automotive suspension systems and relates to a frame-type subframe structure. Background Technology

[0002] The strength of the subframe connection to the body is crucial. Insufficient connection strength can lead to deformation, loosening, or breakage at the joint, affecting the vehicle's structural rigidity and safety. The subframe-body connection is susceptible to erosion from moisture, salt spray, chemicals, and corrosive media, causing corrosion and embrittlement. During operation, vehicles experience complex road conditions and vibration loads. Long-term vibration and fatigue loads can cause fatigue cracks and damage at the subframe-body connection, further affecting its strength and reliability. Currently, butterfly-shaped subframe structures are commonly used, typically with a four-point mounting configuration, a small span between the front and rear mounting points, and a lighter weight. The butterfly subframe structure is a special subframe design used to increase the structural rigidity and safety of a vehicle; it gets its name from its shape resembling butterfly wings. It typically mounts stabilizer bars, steering gears, control arms, and sometimes suspension brackets. Subframes with this design are prone to issues such as abnormal noise or cracking. 。 If the design of the stamped parts is inadequate during the manufacturing process, stress concentration will occur, and after long-term and repeated fatigue, it will slowly tear. Therefore, there is an urgent need to find a new type of subframe structure to solve the above problems. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a frame-type subframe structure, which effectively solves the connection problem between the subframe and the vehicle body. During long-term use, it avoids the problem of the subframe tearing due to stress concentration and repeated fatigue.

[0004] This invention is achieved through the following technical solution:

[0005] A frame-type subframe structure, comprising,

[0006] Left longitudinal beam, right longitudinal beam, front crossbeam, and rear crossbeam;

[0007] The front crossbeam and the rear crossbeam are arranged from top to bottom between the left longitudinal beam and the right longitudinal beam;

[0008] The left longitudinal beam is provided with a left front vehicle body mounting point and a left middle vehicle body mounting point, and the right longitudinal beam is provided with a right front vehicle body mounting point and a right middle vehicle body mounting point.

[0009] The left and right longitudinal beams are symmetrically provided with upper plates at their ends, and lower plates are installed at the ends of the upper plates. A reinforcing plate is provided between the lower plates. The left rear vehicle mounting point and the right rear vehicle mounting point are symmetrically provided on the lower plates.

[0010] Preferably, a left energy-absorbing box mounting bracket and a right energy-absorbing box mounting bracket are symmetrically arranged on the left longitudinal beam and the right longitudinal beam, respectively.

[0011] Preferably, a left front suspension mounting bracket and a right front suspension mounting bracket are respectively provided at both ends of the front crossbeam; a rear suspension bracket is provided on the rear crossbeam.

[0012] Preferably, energy-draining grooves are symmetrically arranged on the left and right longitudinal beams, respectively.

[0013] Preferably, an air conditioning compressor mounting bracket is provided on the right longitudinal beam, with one end of the air conditioning compressor mounting bracket fixedly connected to the right longitudinal beam and the other end connected to the front cross beam.

[0014] Preferably, the frame subframe structure is a H-shaped structure.

[0015] Preferably, the left and right longitudinal beams are mirror images of each other.

[0016] Preferably, the positions of the left front vehicle mounting point and the right front vehicle mounting point are symmetrical and parallel to each other; the positions of the left middle vehicle mounting point and the right middle vehicle mounting point are symmetrical and parallel to each other.

[0017] Preferably, the left front vehicle mounting point, the left middle vehicle mounting point, the right front vehicle mounting point, and the right middle vehicle mounting point are all curved arm structures.

[0018] Preferably, the left longitudinal beam, right longitudinal beam, front crossbeam, rear crossbeam, upper plate, lower plate, and reinforcing plate are all connected by welding.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] This invention provides a frame-type subframe structure. It features left front and left center body mounting points on the left longitudinal beam, and right front and right center body mounting points on the right longitudinal beam. A reinforcing plate is positioned between the two lower plates. Left and right rear body mounting points are symmetrically positioned on the two lower plates. The subframe is connected to the vehicle body at six points, connecting the body and suspension, and improving body rigidity. The front subframe also supports the engine, air conditioning compressor, and transmission. The full-frame subframe absorbs some of the impact force during a frontal collision, effectively solving the subframe-body connection problem. Over long-term use, it prevents tearing due to stress concentration and repeated fatigue.

[0021] Furthermore, this invention adds an air conditioner compressor mounting bracket and an energy-absorbing box module mounting bracket, making it more integrated.

[0022] Furthermore, the left longitudinal beam, right longitudinal beam, front cross beam, upper plate, lower plate and reinforcing plate of the present invention are welded together to form the basic frame of the frame-type subframe, so as to ensure that the basic dimensions of the subframe will not have too much error and meet certain strength, rigidity and weight requirements.

[0023] Furthermore, the left and right longitudinal beams of the present invention are designed with energy-absorbing grooves, and an energy-absorbing box mounting point is added to the front end of the subframe, so that the subframe can protect pedestrians and drivers in the event of a collision.

[0024] Furthermore, products using the technical solution of this invention have improved subframe integration and shortened vehicle assembly time. Modular assembly is employed, where the control arm, steering gear, and stabilizer bar are first assembled with the subframe, and then the compressor is installed on the subframe, further shortening the overall vehicle assembly line time. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the frame subframe of the present invention;

[0026] Figure 2 This is a front view structural diagram of the frame-type subframe;

[0027] Figure 3 This is a 3D structural diagram of the frame-type subframe;

[0028] In the diagram: Left longitudinal beam 1, right longitudinal beam 2, front crossbeam 3, left front body mounting point 4, left middle body mounting point 5, upper plate 6, left rear body mounting point 7, lower plate 8, right front body mounting point 9, right middle body mounting point 10, right rear body mounting point 11, left front suspension mounting bracket 12, right front suspension mounting bracket 13, left energy absorption box mounting bracket 14, energy sink 15, rear suspension bracket 16, right energy absorption box mounting bracket 17, air conditioning compressor mounting bracket 18, rear crossbeam 19, reinforcing plate 20. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] This invention relates to automotive suspension systems, primarily subframes. Subframes connect the vehicle body and suspension, and improve vehicle body rigidity. The front subframe also supports the engine, air conditioning compressor, and transmission. Full-frame subframes can absorb some of the impact force during a frontal collision.

[0032] like Figure 1 and Figure 2 As shown, a frame-type subframe structure includes,

[0033] Left longitudinal beam 1 and right longitudinal beam 2; both left longitudinal beam 1 and right longitudinal beam 2 are cast steel structures.

[0034] The left longitudinal beam 1 and the right longitudinal beam 2 are mirror images of each other. A front crossbeam 3 and a rear crossbeam 19 are arranged sequentially from top to bottom between the left longitudinal beam 1 and the right longitudinal beam 2; both the front crossbeam 3 and the rear crossbeam 19 are cast steel structures.

[0035] like Figure 3 As shown, the left longitudinal beam 1 is provided with a left front vehicle mounting point 4 and a left middle vehicle mounting point 5, and the right longitudinal beam 2 is provided with a right front vehicle mounting point 9 and a right middle vehicle mounting point 10; the positions of the left front vehicle mounting point 4 and the right front vehicle mounting point 9 are symmetrical and parallel to each other. The positions of the left middle vehicle mounting point 5 and the right middle vehicle mounting point 10 are symmetrical and parallel to each other.

[0036] The left front body mounting point 4 and the left middle body mounting point 5 are attached to the cast protruding structure on the left longitudinal beam 1, and are provided with mounting holes for fixing to the body. The right front body mounting point 9 and the right middle body mounting point 10 are attached to the cast protruding structure on the right longitudinal beam 2, and are provided with mounting holes for fixing to the body.

[0037] The ends of the left longitudinal beam 1 and the right longitudinal beam 2 are respectively provided with upper plates 6, and the upper plates 6 are connected to the left longitudinal beam 1 and the right longitudinal beam 2 by welding; the upper plates 6 are provided with limiting grooves for fixing.

[0038] A lower plate 8 is installed at the end of the upper plate 6, and a reinforcing plate 20 is provided between the two lower plates 8. A left rear vehicle mounting point 7 and a right rear vehicle mounting point 11 are symmetrically arranged on the two lower plates 8. The lower plate 8 has a certain curvature, extending outward from the central axis of the frame subframe structure. The subframe is connected to the vehicle body at six points using bolts. The front and middle vehicle mounting points adopt a curved arm structure to solve the problem of insufficient Z-axis height of the vehicle body, and the rear vehicle mounting point is directly connected to the vehicle body. Spaces are reserved on the subframe for installing control arms, steering gears, stabilizer bars, powertrain mounts, and air conditioning compressors. This subframe differs from other subframes in that it adopts a six-point mounting mode and adds compressor mounting brackets and energy-absorbing box module mounting brackets, making it more integrated.

[0039] The subframe is welded together from left longitudinal beam 1, right longitudinal beam 2, front crossbeam 3, upper plate 6, lower plate 8 and reinforcing plate 20 to meet certain strength, rigidity and weight requirements.

[0040] First, the left longitudinal beam 1, right longitudinal beam 2, and front crossbeam 3 are welded together. Then, the left longitudinal beam 1, right longitudinal beam 2, front crossbeam 3, upper plate 6, and lower plate 8 are welded together to form the basic frame of the subframe, ensuring that the basic dimensions of the subframe do not have significant errors. Next, the front and center body mounting brackets, powertrain mounting brackets, and air conditioning compressor brackets are welded onto the subframe in a specific order. The subframe is connected to the body and is relatively fixed. The subframe, control arms, steering gear, stabilizer bar, and compressor are also relatively stationary, remaining relatively still during vehicle movement. This subframe solves the connection problem between the body and suspension, and also improves the body rigidity. It also supports the engine and air conditioning compressor; the full-frame subframe can absorb some of the impact force during a frontal collision. Energy-absorbing grooves 15 are designed on the left and right longitudinal beams 2, and energy-absorbing box mounting points are added to the front end of the subframe, enabling this subframe to protect pedestrians and drivers in the event of a collision.

[0041] A left energy-absorbing box mounting bracket 14 and a right energy-absorbing box mounting bracket 17 are symmetrically arranged on the left longitudinal beam 1 and right longitudinal beam 2, respectively. The left energy-absorbing box mounting bracket 14 is installed at the front end of the left longitudinal beam 1, and the right energy-absorbing box mounting bracket 17 is installed at the front end of the right longitudinal beam 2; the left energy-absorbing box mounting bracket 14 and the right energy-absorbing box mounting bracket 17 are located on the left and right sides of the front crossbeam 3.

[0042] The front crossbeam 3 is provided with a left front suspension mounting bracket 12 and a right front suspension mounting bracket 13 at both ends; the installation direction of the left front suspension mounting bracket 12 is consistent with the axial direction of the front crossbeam 3, and the installation direction of the right front suspension mounting bracket 13 is consistent with the radial direction of the front crossbeam 3; both the right front suspension mounting bracket 13 and the left front suspension mounting bracket 12 are provided with mounting holes.

[0043] A rear suspension bracket 16 is provided on the rear crossbeam 19. The rear suspension brackets 16 are arranged in pairs, symmetrically.

[0044] Energy-draining grooves 15 are symmetrically arranged on the left longitudinal beam 1 and the right longitudinal beam 2, respectively.

[0045] An air conditioning compressor mounting bracket 18 is provided on the right longitudinal beam 2. One end of the air conditioning compressor mounting bracket 18 is fixedly connected to the right longitudinal beam 2, and the other end is connected to the front cross beam 3. The air conditioning compressor mounting bracket 18 has an L-shaped structure and a mounting groove is provided on it.

[0046] The frame-type subframe structure is a "day" character structure, which further solves the problems of abnormal noise or cracking of the subframe, and solves the problem that during the production process of stamping parts, due to inadequate design, stress concentration will be formed, and after long-term repeated fatigue movement, it will tear.

[0047] The left longitudinal beam 1, the right longitudinal beam 2, the front cross beam 3, the rear cross beam 19, the upper plate 6, the lower plate 8 and the reinforcing plate 20 are all connected by welding to meet certain strength, stiffness and weight requirements.

[0048] After adopting the product of the technical solution of this patent, the integration degree of the subframe is improved, and the vehicle assembly time is shortened. By using modular assembly, the control arm, steering gear and stabilizer bar are first assembled with the subframe, and then the compressor is installed on the subframe, which shortens the vehicle assembly line time.

[0049] For the subframe of the present invention, before design, confirm that the subframe will carry components such as engine mounts, compressors, control arms, steering gears, stabilizer bars and the connection methods between the subframe and the vehicle body at several points, and determine the installation point positions of these components; determine the installation point positions according to these associated components, meet the specified safety clearances and design requirements through the structural design requirements of stamping parts, and then determine the general outline of the subframe according to the connection method with the vehicle body. At the same time, according to the collision requirements and NVH requirements put forward by the whole vehicle, requirements are put forward for the design of stamping parts, and the materials, thicknesses and outlines of the subframe are continuously optimized and analyzed to obtain a subframe digital model that can meet various requirements.

[0050] It should be noted that the terms "upper", "lower", "left", "right", etc. in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0051] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A frame-type subframe structure, characterized in that, including, a left longitudinal beam (1), a right longitudinal beam (2), a front cross beam (3) and a rear cross beam (19); the front cross beam (3) and the rear cross beam (19) are arranged between the left longitudinal beam (1) and the right longitudinal beam (2) in sequence from top to bottom; a left front vehicle body mounting point (4) and a left middle vehicle body mounting point (5) are arranged on the left longitudinal beam (1), and a right front vehicle body mounting point (9) and a right middle vehicle body mounting point (10) are arranged on the right longitudinal beam (2); upper plates (6) are symmetrically arranged at the ends of the left longitudinal beam (1) and the right longitudinal beam (2) respectively, a lower plate (8) is mounted at the end of the upper plate (6), and a reinforcing plate (20) is arranged between the lower plates (8); left rear vehicle body mounting points (7) and right rear vehicle body mounting points (11) are symmetrically arranged on the lower plates (8) respectively; left energy absorption box mounting brackets (14) and right energy absorption box mounting brackets (17) are symmetrically arranged on the left longitudinal beam (1) and the right longitudinal beam (2) respectively; crash energy grooves (15) are symmetrically arranged on the left longitudinal beam (1) and the right longitudinal beam (2) respectively; an air conditioner compressor mounting bracket (18) is arranged on the right longitudinal beam (2), one end of the air conditioner compressor mounting bracket (18) is fixedly connected with the right longitudinal beam (2), and the other end is connected with the front cross beam (3); the air conditioner compressor mounting bracket (18) is of an L-shaped structure, and an installation groove is arranged on the air conditioner compressor mounting bracket (18).

2. The frame-type subframe structure according to claim 1, characterized in that, left front suspension mounting brackets (12) and right front suspension mounting brackets (13) are arranged at both ends of the front cross beam (3) respectively; a rear suspension bracket (16) is arranged on the rear cross beam (19).

3. The frame-type subframe structure according to claim 1, characterized in that, the frame-type subframe structure is of a structure in the shape of a Chinese character 'Ri'.

4. The frame-type subframe structure according to claim 1, characterized in that, the left longitudinal beam (1) and the right longitudinal beam (2) are mirror-symmetrical structures to each other.

5. The frame-type subframe structure according to claim 1, characterized in that, the positions of the left front vehicle body mounting point (4) and the right front vehicle body mounting point (9) are symmetric and parallel to each other; the positions of the left middle vehicle body mounting point (5) and the right middle vehicle body mounting point (10) are symmetric and parallel to each other.

6. The frame-type subframe structure according to claim 1, characterized in that, the left front vehicle body mounting point (4), the left middle vehicle body mounting point (5), the right front vehicle body mounting point (9) and the right middle vehicle body mounting point (10) are all of bent arm structures.

7. The frame-type subframe structure according to claim 1, characterized in that, the left longitudinal beam (1), the right longitudinal beam (2), the front cross beam (3), the rear cross beam (19), the upper plate (6), the lower plate (8) and the reinforcing plate (20) are all connected by welding.

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