High-strength lightweight tube beam for commercial vehicle

Abstract

The utility model discloses a kind of high-strength light-weight pipe beams of commercial vehicle, including main pipe body, main pipe body is hollow pipe, main pipe body includes middle pipe section and the end pipe section located in the two sides of middle pipe section, middle pipe section is the hollow pipe of elliptical pipe shape, end pipe section is the horn mouth hollow pipe gradually expanding from inner end to outer end, mounting boss for installing balance shaft support is provided on the outer circumferential surface of end pipe section, the first longitudinal beam mounting plate and the second longitudinal beam mounting plate perpendicular to main pipe body are fixed in the two ends of main pipe body. The high-strength light-weight pipe beam of the above-mentioned commercial vehicle, not only can achieve the purpose of lightening, and structural strength is high.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a high-strength lightweight tubular beam for commercial vehicles. Background Technology

[0002] Commercial vehicles mainly include trucks, buses, and semi-trailers. Tubular beams are primarily installed in the frame or chassis system of commercial vehicles, providing support and connection functions and withstanding various loads from both internal and external sources. Current requirements for vehicles focus on lightweighting, extended lifespan, cost reduction, and energy conservation. Therefore, lightweighting of tubular beams is also of great significance in meeting the requirements for overall vehicle lightweighting.

[0003] The existing technology for commercial vehicle tubular beams has the following main drawbacks:

[0004] 1. Some commercial vehicle tube beams use solid or uniform cross-section round / square tube structures, which result in high weight and low material utilization, which is not conducive to vehicle lightweighting.

[0005] 2. The tubular beams are mostly made of high-grade cast iron or stamped steel plates. Generally, high-grade cast iron lacks sufficient strength, and the connection parts of the frame are prone to fatigue cracking due to stress concentration, resulting in insufficient durability. On the other hand, stamped steel plates are heavy, costly, and have complex manufacturing processes.

[0006] 3. Some tubular beams are made of cast aluminum alloy, which can meet the requirements of lightweight vehicles, but cannot simultaneously guarantee bending, torsion, and impact resistance, making them unsuitable for complex working conditions (such as heavy loads and bumpy roads). Furthermore, they are costly, have poor corrosion resistance, and require additional surface treatment processes. Utility Model Content

[0007] In view of the above-mentioned defects in the prior art, the technical problem to be solved by this utility model is to provide a high-strength lightweight tubular beam for commercial vehicles, which not only achieves the purpose of lightweighting, but also has high structural strength.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A high-strength lightweight tubular beam for commercial vehicles includes a main body, which is a hollow tube. The main body includes a central tube section and end tube sections located on both sides of the central tube section. The central tube section is an elliptical hollow tube, and the end tube sections are flared hollow tubes that gradually expand from the inner end to the outer end. Mounting bosses for mounting balance shaft brackets are provided on the outer circumferential surface of the end tube sections. A first longitudinal beam mounting plate and a second longitudinal beam mounting plate perpendicular to the main body are fixed at both ends of the main body.

[0010] Preferably, the main tube is a conformal tube with uniform wall thickness.

[0011] Preferably, the cross-sectional shape of the middle pipe section is elliptical.

[0012] Preferably, the end tube segment has a spindle-shaped cross-section at one cross-section.

[0013] Preferably, the major axis of the ellipse of the middle pipe section is perpendicular to the major axis of the spindle shape of the end pipe section.

[0014] Preferably, the high-strength lightweight tubular beam of the commercial vehicle is cast from isothermally quenched ductile iron.

[0015] Preferably, the first longitudinal beam mounting plate includes an outer mounting surface, which is a plane, and the first longitudinal beam mounting plate has multiple bolt mounting holes. The second longitudinal beam mounting plate has the same structure as the first longitudinal beam mounting plate.

[0016] Preferably, the end pipe sections located on both sides of the middle pipe section are the first end pipe section and the second end pipe section, respectively. The first end pipe section and the second end pipe section have the same structure and are symmetrically arranged along the center line of the main pipe.

[0017] Preferably, both the first end pipe section and the second end pipe section are provided with the mounting boss, the mounting boss includes two symmetrically arranged connecting legs, a connecting rib is provided between the two connecting legs, and a bolt mounting hole is opened on the bottom surface of each connecting leg.

[0018] Preferably, the side of the mounting boss near the outer end is connected to the end pipe section by a first transition reinforcing rib, and the side of the mounting boss near the inner end is connected to the middle pipe section by a second transition reinforcing rib.

[0019] The beneficial effects of this utility model after adopting the above technical solution are:

[0020] This utility model discloses a high-strength, lightweight tubular beam for commercial vehicles. The main body is a hollow tube, comprising a central section and end sections on either side of the central section. The central section is an elliptical hollow tube, while the end sections are flared hollow tubes that gradually expand from the inner end to the outer end. Mounting bosses for mounting balance shaft brackets are provided on the outer circumference of the end sections. First and second longitudinal beam mounting plates, perpendicular to the main body, are fixed to both ends of the main body. The transitional connection between the elliptical central section and the flared end sections balances the stress on the tubular beam, avoids localized stress concentration, and enhances structural stability.

[0021] Because the main body of this invention is a hollow tube with a conformal, uniform wall thickness, its cross-sectional material distribution is uniform, and its shear stress distribution is balanced, effectively resisting torsion, exhibiting high torsional strength, and possessing a lightweight overall weight. Through CAE simulation analysis and road test verification, it has been shown that, under the same mass conditions, the conformal, uniform wall thickness cross-sectional shape can effectively improve the strength of the tube beam.

[0022] Compared to conventionally reinforced tubular beams, elliptical and spindle-shaped cross-sections offer superior torsional strength. Furthermore, the geometry of elliptical tubes provides better bending resistance under pressure and offers higher support strength, while reducing material usage and enabling lightweight design.

[0023] The high-strength, lightweight tubular beams for commercial vehicles are cast from isothermally hardened ductile iron. Because isothermally hardened ductile iron has high strength, with a tensile strength exceeding 900 MPa, and high fatigue strength, tubular beams cast from it also possess these advantages: high strength, good tensile strength, and high fatigue strength. This method is less expensive than casting tubular beams from aluminum alloys, offers better corrosion resistance, and requires no additional surface treatment.

[0024] In summary, the high-strength lightweight tubular beam for commercial vehicles of this utility model not only achieves the goal of lightweighting but also has high structural strength. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the high-strength lightweight tubular beam for commercial vehicles according to this utility model;

[0026] Figure 2 This is the front view of the high-strength lightweight tubular beam for commercial vehicles according to this utility model;

[0027] Figure 3 yes Figure 2 Sectional view at point AA;

[0028] Figure 4 yes Figure 2 Sectional view at point BB;

[0029] Figure 5 This is a sectional view at point CC in section 2;

[0030] In the diagram: 1. Main pipe; 11. Middle pipe section; 12. First end pipe section; 13. Second end pipe section; 131. Connecting leg; 132. Connecting rib; 133. First transition rib; 134. Second transition rib; 2. First longitudinal beam mounting plate; 21. Mounting outer end face; 211. Bolt mounting hole; 3. Second longitudinal beam mounting plate. Detailed Implementation

[0031] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of this utility model, but it is not intended to limit the scope of protection of the appended claims of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "front", "rear", "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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.

[0033] Furthermore, although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used in this document do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0034] like Figures 1 to 5 As shown, the high-strength lightweight tubular beam for commercial vehicles includes a main body 1, which is a hollow tube. The main body 1 includes a central tube section 11 and end tube sections located on both sides of the central tube section 11. The end tube sections on both sides of the central tube section 11 are a first end tube section 12 and a second end tube section 13, respectively. The central tube section 11 is an elliptical hollow tube, and the end tube sections are flared hollow tubes that gradually expand from the inner end to the outer end. Mounting bosses for mounting balance shaft brackets are provided on the outer circumference of the end tube sections. A first longitudinal beam mounting plate 2 and a second longitudinal beam mounting plate 3, perpendicular to the main body, are fixed to both ends of the main body. The transitional connection between the elliptical central tube section 11 and the flared hollow tube end tube sections balances the stress on the tubular beam, avoids local stress concentration, and enhances structural stability.

[0035] Because the tube beam of this utility model is a hollow tube, and the main body 1 is a conformal tube with uniform wall thickness, its cross-sectional material is evenly distributed, the shear stress is evenly distributed, it can effectively resist torsion, has high torsional strength, and is lightweight overall.

[0036] The central pipe section 11 has an elliptical cross-sectional shape. At one cross-section, the end pipe section has a spindle-shaped cross-section. The central pipe section 11 and the end pipe section have a rounded transition. The major axis of the elliptical central pipe section 11 is perpendicular to the major axis of the spindle-shaped end pipe section. Compared to conventional reinforced pipe beams, the elliptical and spindle-shaped cross-sections have better torsional strength. Furthermore, the geometry of the elliptical pipe provides better bending resistance under pressure and higher support strength, while reducing material usage and achieving lightweight design.

[0037] Through CAE simulation analysis and comparison, as well as road test verification, it has been found that under the same quality conditions, the cross-sectional shape with uniform wall thickness can effectively improve the strength of the tube beam.

[0038] The high-strength, lightweight tubular beams for commercial vehicles are cast from isothermally hardened ductile iron. Because isothermally hardened ductile iron has high strength, with a tensile strength exceeding 900 MPa, and high fatigue strength, tubular beams cast from it also possess these advantages: high strength, good tensile strength, and high fatigue strength. This method is less expensive than casting tubular beams from aluminum alloys, offers better corrosion resistance, and requires no additional surface treatment.

[0039] If QT-700 (spherical cast iron) is used as the material for the tube beam, the overall weight is 42 kg and the material strength is 700 MPa. In contrast, if isothermal hardened ductile iron is used, the material strength is 900 MPa and the overall weight is 38 kg, a weight reduction of 9.5%. This significantly reduces the weight of the tube beam, allowing it to achieve both lightweight construction and high structural strength, good tensile strength, and high fatigue strength.

[0040] like Figure 2 As shown, the end pipe sections located on both sides of the middle pipe section 11 are the first end pipe section 12 and the second end pipe section 13, respectively. The first end pipe section 12 and the second end pipe section 13 have the same structure and are symmetrically arranged along the center line of the main pipe body 1. Both the first end pipe section 12 and the second end pipe section 13 are provided with mounting bosses. The mounting boss includes two symmetrically arranged connecting legs 131, and each connecting leg 131 has a bolt mounting hole on its bottom surface. A connecting rib 132 is provided between the two connecting legs 131. The side of the mounting boss near the outer end is connected to the end pipe section by a first transition reinforcing rib 133, and the side of the mounting boss near the inner end is connected to the middle pipe section 11 by a second transition reinforcing rib 134.

[0041] As shown in the figure, the inner cavities of the first end pipe section 12 and the second end pipe section 13 have a smooth transition without any local depressions. The connecting rib 132 also has a smooth transition without any depressions. The first transition reinforcing rib 133 and the second transition reinforcing rib 134 also have smooth transitions without any depressions. This design facilitates demolding during casting and eliminates the need for additional sand cores to fill any depressions. Compared to traditional pipe beam structures, this significantly reduces the number of sand cores used during casting, resulting in a substantial reduction in sand core costs.

[0042] The first longitudinal beam mounting plate 2 includes a mounting outer end face 21, which is flat. The first longitudinal beam mounting plate 2 has multiple bolt mounting holes 211. The end faces of the bolt mounting holes 211 do not protrude from the mounting outer end face 21, and there are no local recesses on the mounting outer end face 21. This flat mounting outer end face 21 facilitates demolding, reduces process difficulty, and saves on sand cores. The second longitudinal beam mounting plate 3 has the same structure as the first longitudinal beam mounting plate 2.

[0043] This utility model discloses a high-strength lightweight tubular beam for commercial vehicles. The main tube 1 is designed as a hollow tube with a conformal, uniform wall thickness, significantly improving torsional strength and reducing the overall weight of the tube beam. Furthermore, the tube beam is cast from isothermally hardened ductile iron, resulting in high strength, good tensile and bending properties, and high fatigue strength, thus enhancing the overall structural strength. Therefore, this high-strength lightweight tubular beam for commercial vehicles not only achieves weight reduction but also boasts high structural strength.

[0044] This utility model is not limited to the above embodiments. All improvements made based on the concept, principle, structure and method of this utility model are within the protection scope of this utility model.

Claims

1. A high-strength lightweight tubular beam for commercial vehicles, comprising a main body, characterized in that: The main body is a hollow tube, which includes a middle section and end sections located on both sides of the middle section. The middle section is an elliptical hollow tube, and the end sections are flared hollow tubes that gradually expand from the inner end to the outer end. The outer circumferential surface of the end sections is provided with mounting bosses for mounting balance shaft brackets. The two ends of the main body are fixed with a first longitudinal beam mounting plate and a second longitudinal beam mounting plate perpendicular to the main body.

2. The high-strength lightweight tubular beam for commercial vehicles as described in claim 1, characterized in that: The main body is a conformal tube with uniform wall thickness.

3. The high-strength lightweight tubular beam for commercial vehicles as described in claim 1, characterized in that: The cross-sectional shape of the middle pipe section is elliptical.

4. The high-strength lightweight tubular beam for commercial vehicles as described in claim 3, characterized in that: At one cross-section, the end pipe section has a spindle-shaped cross-section.

5. The high-strength lightweight tubular beam for commercial vehicles as described in claim 4, characterized in that: The major axis of the elliptical shape of the middle pipe section is perpendicular to the major axis of the spindle shape of the end pipe section.

6. The high-strength lightweight tubular beam for commercial vehicles as described in claim 1, characterized in that: The high-strength lightweight tubular beam of the commercial vehicle is cast from isothermally quenched ductile iron.

7. The high-strength lightweight tubular beam for commercial vehicles as described in claim 1, characterized in that: The first longitudinal beam mounting plate includes an outer mounting surface, which is a plane. The first longitudinal beam mounting plate has multiple bolt mounting holes. The second longitudinal beam mounting plate has the same structure as the first longitudinal beam mounting plate.

8. The high-strength lightweight tubular beam for commercial vehicles as described in claim 1, characterized in that: The end pipe sections located on both sides of the middle pipe section are the first end pipe section and the second end pipe section, respectively. The first end pipe section and the second end pipe section have the same structure and are symmetrically arranged along the center line of the main pipe.

9. The high-strength lightweight tubular beam for commercial vehicles as described in claim 8, characterized in that: Both the first end pipe section and the second end pipe section are provided with the mounting boss. The mounting boss includes two symmetrically arranged connecting legs, and a connecting rib is provided between the two connecting legs. Each connecting leg has a bolt mounting hole on its bottom surface.

10. The high-strength lightweight tubular beam for commercial vehicles as described in claim 9, characterized in that: The mounting boss is connected to the end pipe section via a first transition reinforcing rib on the side near the outer end, and to the middle pipe section via a second transition reinforcing rib on the side near the inner end.

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