CN201068076Y - Twisting beam and suspension with the same - Google Patents

Abstract

The utility model provides a torsion beam, the cross section of the torsion beam is composed of a plurality of U shapes with different sizes, the plurality of U shapes are stacked in the same direction and the smaller U shapes are located in the larger U shape , the ends of the plurality of U shapes are connected to each other and there is a hollow portion between adjacent U shapes. The utility model also provides a suspension, the suspension includes a torsion beam, an elastic system and a damping system, the elastic system and the damping system are connected to the torsion beam, wherein the torsion beam is the main The above-mentioned torsion beam provided by the utility model. The torsion beam provided by the utility model has higher bending rigidity and thus has a longer service life.

Description

A torsion beam and suspension with the torsion beam

technical field

The utility model relates to a torsion beam and a suspension with the torsion beam.

Background technique

Beams are widely used in various industrial fields, such as bridges, buildings, mechanical products, etc. Generally speaking, beams play a supporting and connecting role in the structure, and are used to strengthen the connection of the overall structure and ensure the integrity of the structure.

For beams used in power machinery (such as automobiles), in addition to the above functions, various torsional moments are often transmitted, so the beam is required not only to have sufficient rigidity, but also to have a certain degree of flexibility, so that The beam can work normally, which can not only ensure the transmission of moment, but also ensure the firmness of the whole structure. Therefore, for beams with the above requirements, it is usually designed as a U-shaped cross-section that is prone to torsion, so as to meet the requirements of the beam to transmit torsional moment. called a torsion beam.

The section of the existing torsion beam is usually a single U-shaped structure with equal width. Although this structure can transmit torsional moment very well, when the torsion beam is loaded or impacted, the torsion beam will also bear a large bending stress, and due to the bending resistance of the torsion beam with a single U-shaped section of equal width The rigidity is limited, therefore, the working life of this kind of torsion beam is short when it is subjected to heavy bending stress.

For the suspension in the vehicle, as shown in Figure 1, it generally includes a torsion beam 1, an elastic system and a damping system (not shown), wherein the two ends of the torsion beam 1 have a pair of bracket arms 2 respectively, The support arm 2 extends longitudinally along the vehicle body, the front end 3 of the support arm 2 is supported by the vehicle body (not shown), and the rear end 4 of the support arm 2 is supported by a wheel (not shown). When the vehicle is in motion, the torsion beam supports the vehicle body and can also transmit torque between the wheels and the vehicle body. Therefore, the cross section of the torsion beam 1 is usually a single U shape with equal width that is easy to twist and facilitate torque transmission. structure, as shown in Figure 2.

When the vehicle is running, especially when a large load is applied, a sharp turn, or a sudden collision with a raised object on the ground, the torsion beam 1 is subjected to a large bending stress, and the lower side of the torsion beam 1 is subjected to a tensile stress. , so that the twisted beam is bent and deformed, and the upper side is subjected to compressive stress. Therefore, the lower side of the twisted beam is often damaged first than the upper side. Therefore, it is generally required that the torsion beam 1 has sufficient bending rigidity. The main reason for the limited service life of the existing suspension is that the bending stiffness of the torsion beam 1 is limited.

Utility model content

The purpose of the utility model is to provide a torsion beam with strong bending stiffness in order to overcome the defect of limited bending stiffness of the existing torsion beam with a single U-shaped section of equal width. Another purpose of the utility model is to overcome the defect of limited service life of the existing suspension and provide a suspension with a longer service life.

The utility model provides a torsion beam, the cross section of the torsion beam is composed of a plurality of U shapes with different sizes, the plurality of U shapes are stacked in the same direction and the smaller U shapes are located in the larger U shape , the ends of the plurality of U shapes are connected to each other and there is a hollow portion between adjacent U shapes.

The utility model also provides a suspension, the suspension includes a torsion beam, an elastic system and a damping system, the elastic system and the damping system are connected to the torsion beam, wherein the torsion beam The aforementioned torsion beam is provided in a new form.

According to the calculation theory of bending normal stress in material mechanics, for a beam subjected to bending stress, EI _Z is called the bending stiffness of the beam, which is a physical quantity to measure the ability of the beam to resist bending deformation, where E is the elasticity of the material Modulus, I _Z is the moment of inertia of the cross section about the neutral axis.

According to the formula I _z = ∫ _A y ² d _A (y is the distance between the research layer and the neutral layer), I _Z depends on two factors: the farther the research layer is from the neutral layer, the larger the I _Z is; The larger the cross-sectional area of the research layer, the larger the I _Z.

For the torsion beam of the present invention, the cross-sectional shape of the torsion beam is a nested U-shape with a hollow part. The area is the same, then must make the size of the torsion beam of the suspension of the present invention greater than the traditional torsion beam, like this, for the torsion beam in the utility model, increase the maximum distance between the research layer and the neutral layer, thereby The I _Z of this torsion beam is increased, and the bending rigidity is enhanced; if the size of the torsion beam of the suspension of the present invention is kept the same as that of the traditional torsion beam, the material near the neutral layer is removed, thereby obtaining a better The material utilization rate is high, and the manufacturing cost is reduced.

According to the suspension provided by the utility model, since the torsion beam has such a cross-sectional shape, compared with the torsion beam of the traditional suspension with the same cross-sectional area, the torsion beam has a relatively larger bending stiffness, so that the torsion beam The service life of the suspension is increased.

Description of drawings

Fig. 1 is the schematic diagram of existing suspension;

Fig. 2 is the sectional view of the torsion beam taken along line B-B in Fig. 1;

Fig. 3 is the schematic diagram of the suspension provided by the utility model;

Fig. 4 is the sectional view of the torsion beam provided by the utility model along the line A-A in Fig. 3;

FIG. 5 is another schematic diagram of the suspension in FIG. 3 .

Detailed ways

Below, the specific implementation manner of the present utility model is described with reference to accompanying drawing. Because the torsion beam provided by the utility model is used in the suspension provided by the utility model, therefore, hereinafter, the torsion beam will be described in detail in conjunction with the suspension, but those of ordinary skill in the art should understand that the torsion beam provided by the utility model Torsion beams are not limited to applications in vehicle suspensions, but may be used in any of the same or similar applications.

The cross-section of the torsion beam provided by the utility model is composed of a plurality of U shapes with different sizes, and the plurality of U shapes are stacked in the same direction and the smaller U shapes are located in the larger U shape. The ends of the U-shape are connected to each other and there is a hollow part between the adjacent U-shape.

Like this, compared with the traditional torsion beam with the same cross-sectional area, the torsion beam in the utility model has larger bending rigidity (compared with the traditional torsion beam with the same size, the torsion beam does not reduce the bending stiffness Under the premise of saving materials and improving the utilization rate of materials, thereby reducing manufacturing costs).

As shown in Figure 4, in order to facilitate the processing and manufacture of the torsion beam, preferably, the U-shape 3 of the torsion beam is composed of two U-shape, including an outer U-shape 5 and an inner U-shape smaller than the outer U-shape 5 Type 6, the inner U-shaped 6 is located in the outer U-shaped 5 and the opening direction of the inner U-shaped 6 and the outer U-shaped 5 is the same, and the ends of the inner U-shaped 6 and the outer U-shaped 5 are connected by The section 7 is connected with a hollow section 8 between said outer U-shape 5 and inner U-shape 6 .

The U-shape referred to here does not necessarily have to be exactly the same as the shape of the letter U, but may be a U-shape or a shape close to a U-shape.

A pair of U-shaped 3 includes a larger outer U-shaped 5 and a smaller inner U-shaped 6, and the inner U-shaped 6 is placed in the outer U-shaped 5, and the two keep the same opening direction, as shown in Figure 4, It is equivalent to superimposing two U shapes together. The opening sides of the outer U-shaped 5 and the inner U-shaped 6 are connected to each other by the connecting portion 7, and there is a gap between the outer U-shaped 5 and the inner U-shaped 6, so that the outer U-shaped 5, the inner U-shaped 6 and the connecting portion 7 defines a hollow portion 8 .

From the above theoretical analysis based on material mechanics, it can be seen that compared with the cross-sectional shape of the traditional suspension with the same cross-sectional area, the cross-sectional shape provided by the utility model is a hollow structure, which increases the distance between the research layer and the neutral layer. Therefore, the torsion beam provided by the utility model has a relatively large bending rigidity EI _Z .

For a torsion beam with a U-shaped cross-section, the distance between the U-shaped open side and the U-shaped centroid is greater than the distance between the U-shaped closed side and the U-shaped centroid. Therefore, in comparison, the U-shaped open side The bending rigidity is greater than that of the U-shaped closed side. Therefore, the suspension with a U-shaped cross-section usually makes the U-shaped opening downward in the installed state, so that the U-shaped open side can bear more tensile stress. , while the closed side bears more compressive stress.

The hollow part 8 between the outer U-shaped 5 and the inner U-shaped 6 can have the same width, and can also have unequal widths; the wall thickness of the outer U-shaped 5 or the inner U-shaped 6 can also be equal in width The structure can also be gradually enlarged from the closed side of the U-shaped 3 to the open side. These can be selected in the design process according to specific application occasions.

In order to further increase the bending stiffness of the torsion beam of the suspension provided by the present invention, preferably, the width of the hollow part 8 gradually widens from the closed side of the U-shape to the open side of the U-shape .

As shown in Figure 4, one side of a pair of U-shaped 3 is the closed side, and the other side is the open side, because the width of the hollow part 8 at the closed side is smaller, and the width at the open side is larger, like this, in satisfying Under the same condition as the cross-sectional area of the traditional twisted beam, the cross-sectional shape (a pair of U-shaped) of the twisted beam of the present utility model must have a larger size, so that the opening side of the pair of U-shaped 3 is aligned with the middle. The distance of the neutral layer becomes larger, so that the I _Z of the torsion beam section becomes larger, thereby enhancing the bending rigidity of the torsion beam, especially the opening side of the U shape (because the distance between the opening side and the neutral layer is greater) .

In order to ensure that the inner U-shaped 6 and the outer U-shaped 5 have similar strengths, preferably, the ratio of the wall thickness of the outer U-shaped 5 to the inner U-shaped 6 is 0.5-2, more preferably 1 (that is, the outer U-shaped Same wall thickness as inner U).

In order to ensure that the torsion beam has sufficient strength under the premise of improving the rigidity of the torsion beam, preferably, the ratio of the maximum width of the hollow part 8 to the wall thickness of the outer U-shaped 5 is 1-2.5, more preferably 2, that is The maximum width of the hollow part 8 is twice the wall thickness of the outer U-shape.

When the torsion beam 1 is subjected to a torque acting on a vertical plane parallel to the longitudinal direction of the torsion beam 1, the U-shaped cross-sectional shape of the torsion beam 1 is preferably U-shaped with an equal-width opening, so that it can resist to the greatest extent. The bending action of torque. However, during the running of the vehicle, the plane of the torque acting on the torsion beam 1 is often at a smaller angle with the vertical plane of the torsion beam 1 along the longitudinal direction. Beam 1 cannot adapt to this situation, so it is prone to early defects under the action of bending torque.

Therefore, in a preferred situation, in order to better adapt to the above situation, the opening width of the U-shape 3 gradually increases from the closed side of the U-shape to the open side.

As shown in Figure 4, the cross-sectional shape (U-type 3) of torsion beam 1 is not an equal-width structure, that is, the distance between the two sides of U-type 3 gradually increases from the closed side to the open side, so, with this cross-section The shaped torsion beam 1 can be adapted to the torque action acting on the torsion beam in different planes, while at the same time having a long service life. Preferably, the angle between the two sides of the U-shape 3 is 5°-60°, more preferably 45°.

The opening side of the torsion beam 1 bears more tensile stress, while the closed side bears more compressive stress. Therefore, the connecting part 7 used to connect the opening side of the outer U-shaped 5 and the opening side of the inner U-shaped 6 should have sufficient strength. Therefore, the connecting portion 7 will have sufficient thickness. In a preferred situation, as shown in FIG. The thickness of the connecting portion 7 is greater than the sum of the wall thicknesses of the inner U-shape 6 and the outer U-shape 5 . In this way, the rigidity and strength requirements of the connecting portion 7 can be met, and the connecting portion 7 reliably and firmly connects the outer U-shaped 5 and the inner U-shaped 6 together, thereby ensuring the overall strength of the pair of U-shaped 3 .

In order to further enhance the strength of the torsion beam 1, preferably, as shown in FIG. 5 , the torsion beam 1 also includes a reinforcement plate 9, and the side edges of the reinforcement plate 9 are fixed to both sides of the U-shaped 3 of the torsion beam 1, In this way, the torsion beam 1 having a U-shaped cross-section can be strengthened and strengthened. The reinforcing plate 9 can be arranged at multiple positions of the torsion beam 1 as required, and is preferably arranged at the end where a greater force is applied.

The torsion beam provided by the utility model can be obtained through various manufacturing methods, such as internal high pressure forming process.

The utility model also provides a suspension, which includes a torsion beam 1, an elastic system and a damping system (not shown), the elastic system and the damping system are connected to the torsion beam 1, wherein the elastic system The function of the damping system is to buffer the impact on the vehicle body. The function of the damping system is to quickly attenuate the generated vibration, thereby improving the comfort of the car. Commonly used elastic systems include leaf springs, gas springs, etc. Commonly used damping systems include cylinders. Shock absorbers, gas-filled shock absorbers, etc. For the suspension systems of different vehicles, there are various elastic systems and damping systems to choose from, which are well known to those skilled in the art.

As shown in Figure 3, the torsion beam 1 also includes a pair of bracket arms 2, the bracket arms 2 are located at both ends of the torsion beam 1, for the sake of simplicity, only the left end of the torsion beam 1 is shown in Figure 3, and the front end of the bracket arms 2 It can be supported on the vehicle body (not shown) through rubber bushings, and the rear end of the support arm 2 is supported on the wheels (not shown). In this way, the suspension realizes the connection between the vehicle body and the wheels. The connection of the bracket arm to the wheel and the vehicle body is well known to those of ordinary skill in the art. The support arm 2 can be integrally made with the torsion beam, and can also be fastened to the end of the torsion beam by welding.

According to the suspension provided by the utility model, the cross-sectional shape of the torsion beam of the suspension is a nested double U shape with a hollow part. If the cross-sectional area of the torsion beam of the suspension of the utility model is kept the same If the cross-sectional area of the torsion beam is the same, the I _Z of the torsion beam is increased, and the bending rigidity is enhanced; Material removal, resulting in better material utilization and reduced manufacturing costs.

Claims (10)

1. turn round beam for one kind, it is characterized in that, this cross-sectional plane of turning round beam is made up of a plurality of U types (3) that vary in size, and described a plurality of U types (3) stack in the same way and less U type is positioned at bigger U type, the end of described a plurality of U types be connected to each other and adjacent U type between have hollow space (8).

2. the beam of turning round according to claim 1 is characterized in that described U type (3) is two, is respectively outer U type (5) and the size interior U type (6) less than this outer U type (5), and the end of described interior U type (6) and outer U type (5) is connected by connecting bridge (7).

3. the beam of turning round according to claim 1 is characterized in that the width of described hollow space (8) broadens to open side gradually from the closed side of described U type (3).

4. the beam of turning round according to claim 2 is characterized in that, described outer U type (5) is 0.5-2 with the ratio of the wall thickness of interior U type (6).

5. according to claim 3 or the 4 described beams of turning round, it is characterized in that the ratio of the width that described hollow space (8) is maximum and the wall thickness of described outer U type (5) is 1-2.5.

6. according to claim 2 or the 3 described beams of turning round, it is characterized in that the width of described U type (3) becomes big from the closed side of this U type gradually to open side.

7. the beam of turning round according to claim 6 is characterized in that, the angle between the both sides of described U type (3) is 5 °-60 °.

8. the beam of turning round according to claim 2 is characterized in that, the wall thickness of described connecting bridge (7) is greater than the wall thickness sum of U type (6) in described with outer U type (5).

9. the beam of turning round according to claim 2 is characterized in that, the described beam of turning round also comprises brace panel (9), and described brace panel (9) is captiveed joint with the described both sides of turning round the U type (3) of beam (1).

10. suspension, described suspension comprises turns round beam, elastic system and vibration insulating system, and described elastic system and vibration insulating system all are connected in the described beam of turning round, and it is characterized in that, and the described beam of turning round is any described beam of turning round in the claim 1 to 9.

Images