A longitudinal beam structure

Abstract

This utility model discloses a longitudinal beam structure, including a tire-prepared portion and a transitional narrowing portion, which are interconnected by a connecting part. The tire-prepared portion features a longitudinally protruding arc-shaped bend; the transitional narrowing portion has a transversely protruding shape. Multiple straight sections, pre-prepared sections, transition sections, narrowing sections, and boss sections are integrally formed under internal high-pressure forming. This utility model has a reasonable and ingenious structural design. The overall design facilitates internal high-pressure integral forming, saves materials during manufacturing, improves material utilization, and reduces production costs. Furthermore, due to the integral forming process, there are no weld seams on the surface, improving bending, torsional, and fatigue strength, and achieving overall lightweighting.

Description

Technical Field

[0001] This utility model relates to a longitudinal beam structure and belongs to the field of automotive parts technology. Background Technology

[0002] As a crucial mode of transportation in China's road transport system, the lightweighting and structural strength of passenger cars significantly impact their economy and safety. Currently, most passenger car frames in China are still constructed from several tubular components welded or spliced ​​together. This method of frame construction has several drawbacks, such as excessive overall weight, low material utilization, insufficient overall rigidity and strength, and a lengthy manufacturing process. With the development of my country's manufacturing industry, traditional passenger car frame longitudinal beams can no longer meet the goals of lightweighting passenger cars, necessitating a lighter, stronger, and simpler longitudinal beam design. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, this utility model provides a longitudinal beam structure that is lightweight, high-strength, and simple to process.

[0004] To achieve this objective, the structure adopted by this utility model is: a longitudinal beam structure, including a tire pre-reserved portion and a transitional narrowing portion, the tire pre-reserved portion and the transitional narrowing portion being connected to each other through a connecting portion; the tire pre-reserved portion is provided with a longitudinally protruding arc-shaped bend; the transitional narrowing portion is laterally protruding.

[0005] The tire pre-reserved portion is provided with a first protrusion section, a first transition section, a first straight section, a first reserved section, a second reserved section, and a third reserved section in sequence from front to back; the width of the first protrusion section is greater than that of the first straight section, and the end of the first protrusion section is connected to the first straight section through the first transition section; the first reserved section, the second reserved section, and the third reserved section are connected in sequence to form a longitudinally raised arc-shaped bend, and the longitudinally raised arc-shaped bend is connected to the end of the first straight section.

[0006] The connecting portion includes a second straight section, a second transition section, a second boss section, a third transition section, and a third straight section connected in sequence; the width of the second boss section is greater than that of the second straight section and the third straight section, and the two ends of the second boss section are connected to the second straight section and the third straight section through the second transition section and the third transition section, respectively; the first end of the second straight section is connected to the end of the tire reserved portion.

[0007] The transitional narrowing section includes a first narrowing segment, a fourth straight segment, a second narrowing segment, a fourth transition segment, a third protruding segment, a fifth transition segment, a fifth straight segment, a sixth transition segment, a fourth protruding segment, a seventh transition segment, and a sixth straight segment connected in sequence. The first narrowing segment, the fourth straight segment, and the second narrowing segment form a laterally protruding S-shaped bend. The width of the third protruding segment is greater than that of the S-shaped bend and the fifth straight segment, and the two ends of the third protruding segment are connected to the S-shaped bend and the fifth straight segment through the fourth transition segment and the fifth transition segment, respectively. The width of the fourth protruding segment is greater than that of the fifth straight segment and the sixth straight segment, and the two ends of the fourth protruding segment are connected to the fifth straight segment and the sixth straight segment through the sixth transition segment and the seventh transition segment, respectively. The first narrowing segment is connected to the end of the connecting section.

[0008] The tire pre-reserved section, connecting section, and excessively narrowed section are integrally formed by internal high pressure using steel pipes with an I-shaped longitudinal section.

[0009] The steel pipe has an I-shaped longitudinal section. The first section is horizontally arranged at both ends of the longitudinal section, and the third section is vertically arranged symmetrically on the left and right. The first section has rounded corners at both ends, and each rounded corner connects to a vertical second section. The second section is connected to the third section through an inclined section narrowing segment.

[0010] Its beneficial effects are: the structure of this utility model is reasonable and ingenious, the material utilization rate is high, and the material cost is saved; the integrity of the parts is good, which improves the bending resistance, torsion resistance and fatigue strength; the integral forming process is simple and reduces the cost; the weight can be reduced, and lightweighting is achieved. Attached Figure Description

[0011] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0013] Figure 2 This is a side view of the present invention;

[0014] Figure 3 This is a top view of the present invention;

[0015] Figure 4 This is a cross-sectional view of the connecting portion;

[0016] Figure 5 This is a longitudinal section view of the present invention.

[0017] In the diagram: First boss segment 1; First transition segment 2; First straight segment 3; First reserved segment 4; Second reserved segment 5; Third reserved segment 6; Second straight segment 7; Second transition segment 8; Second boss segment 9; Third transition segment 10; Third straight segment 11; First narrowing segment 12; Fourth straight segment 13; Second narrowing segment 14; Fourth transition segment 15; Third boss segment 16; Fifth transition segment 17; Fifth straight segment 18; Sixth transition segment 19; Fourth boss segment 20; Seventh transition segment 21; Sixth straight segment 22; First cross-section straight segment 23; Rounded corner 24; Second cross-section straight segment 25; Cross-section narrowing segment 26; Third cross-section straight segment 27. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components; a fixed connection can be welding or adhesive bonding. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] like Figures 1-3 The illustrated longitudinal beam structure includes a tire-prepared section and a tapered section, which are interconnected by a connecting part. The tire-prepared section features a longitudinally protruding arc-shaped bend, providing space for the tire while maintaining the horizontal stability of the frame. The tapered section protrudes laterally, providing more space for the vehicle body while improving structural strength along the lateral direction.

[0022] The tire pre-reserved portion is provided with a first protrusion section 1, a first transition section 2, a first straight section 3, a first reserved section 4, a second reserved section 5, and a third reserved section 6 from front to back. The width of the first protrusion section 1 is greater than that of the first straight section 3, and the end of the first protrusion section 1 is connected to the first straight section 3 through the first transition section 2; the first reserved section 4, the second reserved section 5, and the third reserved section 6 are connected in sequence to form a longitudinally protruding arc-shaped bend, and the longitudinally protruding arc-shaped bend is connected to the end of the first straight section 3.

[0023] like Figure 4 As shown, the connecting portion includes a second straight section 7, a second transition section 8, a second boss section 9, a third transition section 10, and a third straight section 11 connected in sequence. The width of the second boss section 9 is greater than that of the second straight section 7 and the third straight section 11. The two ends of the second boss section 9 are connected to the second straight section 7 and the third straight section 11 respectively through the second transition section 8 and the third transition section 10. The first end of the second straight section 7 is connected to the end of the tire pre-reserved portion.

[0024] The transitional narrowing section comprises, in sequence, a first narrowing segment 12, a fourth straight segment 13, a second narrowing segment 14, a fourth transition segment 15, a third protruding segment 16, a fifth transition segment 17, a fifth straight segment 18, a sixth transition segment 19, a fourth protruding segment 20, a seventh transition segment 21, and a sixth straight segment 22. The first narrowing segment 12, the fourth straight segment 13, and the second narrowing segment 14 form a laterally protruding S-shaped bend. The width of the third protruding segment 16 is greater than that of the S-shaped bend and the fifth straight segment 18, and both ends of the third protruding segment 16 are connected to the S-shaped bend and the fifth straight segment 18 via the fourth transition segment 15 and the fifth transition segment 17, respectively. The width of the fourth protruding segment 20 is greater than that of the fifth straight segment 18 and the sixth straight segment 22, and both ends of the fourth protruding segment 20 are connected to the fifth straight segment 18 and the sixth straight segment 22 via the sixth transition segment 19 and the seventh transition segment 21, respectively. The first narrowing segment 12 is connected to the end of the connecting section.

[0025] All the above straight sections are flat profile structures, all transition sections are profile structures with trapezoidal longitudinal sections, and all boss sections are welded structures used for frame fixing. The center line of each boss section is a straight line, which does not change the direction of the longitudinal beam structure. The relatively wide boss sections can provide a larger welding platform for subsequent frame welding, while improving the longitudinal strength of the longitudinal beam.

[0026] like Figure 5As shown, the tire-reserved portion, connecting portion, and transitional narrowing portion are integrally formed from an I-shaped steel pipe through internal high-pressure molding. The steel pipe has an I-shaped longitudinal section with symmetrically arranged horizontal first-section straight segments 23 at both ends and symmetrically arranged vertical third-section straight segments 27 on both sides. The first-section straight segments 23 have symmetrically arranged rounded corners 24 at both ends, each rounded corner 24 connecting to a vertical second-section straight segment 25. The second-section straight segment 25 is connected to the third-section straight segment 27 via an inclined narrowing section 26. This I-shaped steel pipe provides molding space for the internal high-pressure molding process while also providing two lateral ridges for the longitudinal beam structure, improving overall strength.

[0027] The above-mentioned internal high-pressure integrated forming process steps are as follows: First, the steel pipe, slightly longer than the longitudinal beam, is cut into shape; then, the cut steel pipe is bent by a preforming machine to achieve the approximate shape of the longitudinal beam; next, the preformed steel pipe is placed horizontally along the side ridge into the internal high-pressure forming mold. With the merging of the upper and lower molds and the sealing of the front and rear plugs, high-pressure liquid is injected into the steel pipe. After reaching the predetermined internal pressure, the pressure is maintained for a certain time to complete the internal high-pressure forming; the surface of the internally high-pressure formed longitudinal beam is then shaped; finally, laser cutting is used to flatten the cross-sections at both ends of the longitudinal beam and precisely adjust the overall length. Using the internal high-pressure forming process ensures that the entire longitudinal beam has a consistent thickness, high structural strength, and high forming accuracy.

[0028] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A stringer structure, characterized by, It includes a tire pre-reserved portion and a transitional narrowing portion, which are connected to each other by a connecting portion; the tire pre-reserved portion has a longitudinally protruding arc-shaped bend; the transitional narrowing portion has a laterally protruding shape.

2. A stringer structure according to claim 1, wherein The tire reserved portion is provided with a first boss section (1), a first transition section (2), a first straight section (3), a first reserved section (4), a second reserved section (5), and a third reserved section (6) from front to back; the width of the first boss section (1) is greater than that of the first straight section (3), and the end of the first boss section (1) is connected to the first straight section (3) through the first transition section (2); the first reserved section (4), the second reserved section (5), and the third reserved section (6) are connected in sequence to form a longitudinally raised arc-shaped bend, and the longitudinally raised arc-shaped bend is connected to the end of the first straight section (3).

3. A stringer structure according to claim 1, wherein The connecting part includes a second straight section (7), a second transition section (8), a second boss section (9), a third transition section (10), and a third straight section (11) connected in sequence; the width of the second boss section (9) is greater than that of the second straight section (7) and the third straight section (11), and the two ends of the second boss section (9) are connected to the second straight section (7) and the third straight section (11) through the second transition section (8) and the third transition section (10) respectively; the first end of the second straight section (7) is connected to the end of the tire reserved part.

4. A stringer structure according to claim 1, wherein The transitional narrowing section comprises a first narrowing segment (12), a fourth straight segment (13), a second narrowing segment (14), a fourth transition segment (15), a third protruding segment (16), a fifth transition segment (17), a fifth straight segment (18), a sixth transition segment (19), a fourth protruding segment (20), a seventh transition segment (21), and a sixth straight segment (22) connected in sequence; the first narrowing segment (12), the fourth straight segment (13), and the second narrowing segment (14) form a laterally protruding S-shaped bend; the third protruding segment (16) The width is greater than that of the S-shaped bend and the fifth straight section (18). The two ends of the third boss section (16) are connected to the S-shaped bend and the fifth straight section (18) through the fourth transition section (15) and the fifth transition section (17) respectively. The width of the fourth boss section (20) is greater than that of the fifth straight section (18) and the sixth straight section (22). The two ends of the fourth boss section (20) are connected to the fifth straight section (18) and the sixth straight section (22) through the sixth transition section (19) and the seventh transition section (21) respectively. The first narrowing section (12) is connected to the end of the connecting part.

5. A stringer structure according to claim 1, wherein The tire pre-reserved section, connecting section, and excessively narrowed section are integrally formed by internal high pressure using steel pipes with an I-shaped longitudinal section.

6. A stringer structure according to claim 5, wherein, The longitudinal section of the steel pipe is I-shaped. The first section straight segment (23) is symmetrically arranged at the upper and lower ends of the longitudinal section, and the third section straight segment (27) is symmetrically arranged on the left and right. The first section straight segment (23) is symmetrically arranged at both ends with rounded corners (24). Each rounded corner (24) is connected to a vertical second section straight segment (25). The second section straight segment (25) is connected to the third section straight segment (27) through an inclined section narrowing segment (26).

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