Misaligned milled torsion beam assembly

Abstract

The application relates to the technical field of automobile parts, and particularly discloses a non-end-milling torsion beam assembly, which comprises a cross beam and a longitudinal arm, a wheel hub mounting support is fixed on the longitudinal arm, a support reinforcing plate is fixed on the wheel hub mounting support, the support reinforcing plate is welded on the inner side end face of the wheel hub mounting support, and the top of the longitudinal arm opposite to the wheel hub mounting support is in a concave shape. The scheme is used to solve the problems of high production cost and low production efficiency of the torsion beam assembly in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts, and in particular to a non-end-milled torsion beam assembly. Background Art

[0002] The torsion beam assembly includes a crossbeam and two longitudinal arms, each of which is equipped with a sleeve, a wheel hub mounting bracket, a spring mounting plate, etc. The wheel hub mounting bracket needs to be welded with a bracket reinforcement plate on the outside of the wheel hub mounting bracket to ensure the connection strength with the automobile wheel hub. The thickness of the material used for the bracket reinforcement plate needs to be higher than the design size to ensure the toe and camber requirements of the torsion beam assembly after end milling the bracket reinforcement plate. However, the end milling process set up to improve the accuracy of the torsion beam assembly requires additional milling equipment, milling stations and post-milling grinding stations, which greatly increases the production cost of the torsion beam assembly and low production efficiency.

[0003] The inventors have found that in the prior art, the bracket reinforcement plate is basically welded to the outside of the wheel hub mounting bracket. The most critical factor is that the existing welding process cannot ensure that the deformation is controlled within the product design tolerance range, so the bracket reinforcement plate installed on the outside is used and end milling is performed to ensure the product accuracy of the torsion beam assembly; but there are other factors. For example, the bracket reinforcement plate is set on the outside of the wheel hub mounting bracket, which enables the welding process of the bracket reinforcement plate and the wheel hub mounting bracket to be adjusted according to the actual situation of the factory to adjust the processing sequence of the torsion beam assembly.

[0004] A major factor affecting the large amount of welding deformation is the setting of the fixture. When welding the crossbeam and the longitudinal arm assembly, the fixture is positioned on the sleeve and the wheel hub mounting bracket at the two ends of the longitudinal arm respectively. However, during the welding process of the crossbeam and the longitudinal arm assembly, the high heat generated by welding will be transmitted along the length direction of the crossbeam and the longitudinal arm, making the temperature of the longitudinal arm itself, the crossbeam itself and the area enclosed by the longitudinal arm and the crossbeam very high. The fixture is easily affected by the temperature, which affects the clamping ability and service life; the fixture is designed to take into account the convenience of installation and removal of the torsion beam assembly and reduce the temperature. In order to overcome the influence of the degree of deformation, the wheel hub mounting bracket is positioned on the outside and clamped from the inside of the wheel hub mounting bracket. However, since a bracket reinforcement plate is installed on the outside of the wheel hub mounting bracket, the surface for outer positioning can only be the end face of the bracket reinforcement plate. The size and area of ​​this end face are small, which is not conducive to the accuracy of positioning and the control of welding deformation. As a result, end milling of the bracket reinforcement plate becomes an indispensable process. The problems of high production cost and low production efficiency caused by end milling have not been solved. Summary of the Invention

[0005] The present invention aims to provide a torsion beam assembly without end milling, so as to solve the problems of high production cost and low production efficiency in the prior art where the torsion beam assembly needs to be end milled.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The non-end-milling torsion beam assembly includes a crossbeam and a longitudinal arm. A wheel hub mounting bracket is fixed on the longitudinal arm. A bracket reinforcement plate is fixed on the wheel hub mounting bracket. The bracket reinforcement plate is welded to the inner end surface of the wheel hub mounting bracket. The top section of the longitudinal arm facing the wheel hub mounting bracket is concave.

[0008] The principle and advantages of this solution are as follows: the inventor studied the torsion beam assembly and considered changing the position of the bracket reinforcement plate, such as placing the bracket reinforcement plate on the inner side of the wheel hub mounting bracket. However, after the position change, the size of the bracket reinforcement plate must be made smaller to facilitate the welding of the bracket reinforcement plate on the wheel hub mounting bracket; however, this method will make the positioning and clamping of the tooling fixture during welding of the torsion beam assembly worse, simply because after the bracket reinforcement plate is placed on the inner side of the wheel hub mounting bracket, the bracket reinforcement plate needs to be set smaller for welding, and when the bracket reinforcement plate is clamped by the tooling fixture, the moving stroke of the tooling fixture is limited by the longitudinal arm, resulting in a smaller inner size of the wheel hub mounting bracket that can be clamped by the tooling fixture, so that when the inside and outside are clamped, either the inside and outside cannot be clamped directly, resulting in a loose clamping situation; or the clamping area formed when clamping directly is small, resulting in inaccurate positioning, and the position accuracy before welding cannot be guaranteed. All of these are not conducive to controlling the deformation of the torsion beam assembly after it is manufactured.

[0009] This solution provides a larger clamping space for the tooling fixture to clamp the wheel hub mounting bracket by machining a concave shape at the top of the longitudinal arm. Therefore, even if the bracket reinforcement plate is welded to the inner side of the wheel hub mounting bracket, the clamping area will not be reduced. After the bracket reinforcement plate is replaced to the inner end face of the wheel hub mounting bracket, the outer end face of the wheel hub mounting bracket is a large flat surface, and there will be no welding slag on the large flat surface, which ensures that the outer side of the wheel hub mounting bracket is a flat large flat surface, ensuring the accuracy of positioning. There is no need to mill or grind the position to be positioned before the tooling fixture is positioned. The inner end face of the wheel hub mounting bracket is mainly used to cooperate with the outer positioning end face for clamping, so the surface quality requirements of the inner end face are very high. The reduction is also conducive to maximizing the clamping area as much as possible on the basis of satisfying the clamping of the fixture (the definition of the clamping area: if four points are clamped, the area formed by the four points connected in sequence is the clamping area). On the basis of the larger clamping area and the larger and more precise positioning surface, the fixture can position the torsion beam assembly to be formed more accurately and clamp with greater clamping force, reducing the deformation amplitude of the torsion beam assembly after welding, so that the torsion beam assembly produced by adopting this structure can meet the dimensional design requirements of the torsion beam assembly even without end milling, solving the problem of the current need for end milling, thus eliminating the end milling process, greatly improving production efficiency and reducing production costs.

[0010] In addition, the top section of the trailing arm is concave. Compared with a smooth structure, the concave shape formed here can enhance the strength of the trailing arm.

[0011] Preferably, as an improvement, the four corners of the bracket reinforcement plate are processed with bevels, and the spare space on the hub mounting bracket next to the bevels of the bracket reinforcement plate is used for tooling fixture positioning.

[0012] This solution sets the bevel angle of the bracket reinforcement plate so that the blank end surface area of ​​the bracket reinforcement plate next to the bevel angle for the hub mounting bracket is larger, which facilitates clamping and positioning at the free corner position next to the bevel angle, further expands the clamping area, and is beneficial to improving the dimensional accuracy of the torsion beam assembly after forming.

[0013] Preferably, as an improvement, the length of the wheel hub mounting bracket along the longitudinal direction of the longitudinal arm is 1 / 3-2 / 5 of the overall length of the longitudinal arm.

[0014] This solution increases the length of the wheel hub mounting bracket in the longitudinal direction, making the outer end surface of the wheel hub mounting bracket larger, which is further beneficial to improving the accuracy of positioning. At the same time, it also increases the area of ​​the clamping area on the inner side of the wheel hub mounting bracket, which is beneficial to improving the positioning and clamping of the tooling fixture on the wheel hub mounting bracket, and further helps to improve the product accuracy of the torsion beam assembly after it is manufactured.

[0015] Preferably, as an improvement, the wheel hub mounting bracket is provided with a bevel section integrally formed with the end face, one end of the bevel section is close to the bottom of the bracket reinforcement plate, and the other end of the bevel section is welded to the side end face of the longitudinal arm or welded at the corner position of the side end face of the longitudinal arm.

[0016] This solution improves the strength of the wheel hub mounting bracket by improving the wheel hub mounting bracket.

[0017] Preferably, as an improvement, the longitudinal arm includes two stamped parts, which are arranged on the left and right, one of which overlaps the outer surface of the other, and the height of the stamped part close to the wheel hub mounting bracket is lower than the other.

[0018] In this solution, the longitudinal arm is made of stamping parts, which makes the forming of the longitudinal arm simple and fast; and the height of the stamping parts close to the wheel hub mounting bracket is lower, so that the longitudinal arm leaves more space for the movement of the tooling fixture.

[0019] Preferably, as an improvement, a beam overlap section with an arc-shaped cross section is formed on the stamping part used for welding to the beam.

[0020] Beneficial effect: The arc-shaped crossbeam overlap section facilitates the welding of the crossbeam and the longitudinal arm, and the weld is arc-shaped, so there will be no stress concentration problem caused by excessive weld angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0022] Figure 2 for Figure 1 Top view of .

[0023] Figure 3 for Figure 1 Exploded view of the trailing arm and wheel hub mounting bracket. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The reference numerals in the drawings of the specification include: crossbeam 1 , longitudinal arm 2 , concave section 21 , stamping part 20 , crossbeam overlap section 201 , wheel hub mounting bracket 3 , inclined section 31 , bracket reinforcement plate 4 .

[0026] The embodiment is basically as shown in the attached Figures 1 to 3 As shown, the un-end-milled torsion beam assembly comprises a crossbeam 1 and a trailing arm 2. A wheel hub mounting bracket 3 is welded to the trailing arm 2. A bracket reinforcement plate 4 is welded to the inner end face of the wheel hub mounting bracket 3. The top section of the trailing arm 2, facing the wheel hub mounting bracket 3, is concave 21. The bracket reinforcement plate 4 has beveled corners at all four corners. The remaining space on the wheel hub mounting bracket 3, adjacent to the beveled corners of the bracket reinforcement plate 4, is used for fixture positioning. The length of the wheel hub mounting bracket 3 along the length of the trailing arm 2 is 1 / 3-2 / 5 of the overall length of the trailing arm 2.

[0027] The present embodiment processes a concave shape 21 on the top of the longitudinal arm 2, thereby providing a larger clamping space for the tool fixture to clamp the wheel hub mounting bracket 3. Therefore, even if the bracket reinforcement plate 4 is welded to the inner side of the wheel hub mounting bracket 3, the clamping area will not be reduced. Because the outer end face of the wheel hub mounting bracket 3 is a large plane, there will be no welding slag on the large plane, which ensures that the outer side face of the wheel hub mounting bracket 3 is a flat large plane, thereby ensuring the accuracy of positioning. The wheel hub mounting bracket 3 has enough free surface next to the bevel of the bracket reinforcement plate 4 to set the clamping point of the tool fixture, so that when the clamping of the tool fixture is met On the basis of the invention, the clamping area is maximized as much as possible. On the basis of the enlarged clamping area and the larger and more precise positioning surface, the tooling fixture can position the torsion beam assembly to be formed more accurately and clamp with greater clamping force, thereby ensuring the positioning accuracy before welding and improving the resistance to post-weld deformation (clamping force) after welding. The dimensional accuracy of the torsion beam assembly is improved before and after welding, so that the torsion beam assembly produced by adopting this structure can meet the dimensional design requirements of the torsion beam assembly even without end milling, eliminating the end milling process, greatly improving production efficiency and reducing production costs.

[0028] In addition, a top section of the longitudinal arm 2 is concave 21 , which is beneficial to enhancing the strength of the longitudinal arm 2 .

[0029] A bevel section 31 is stamped on the wheel hub mounting bracket 3 , one end of the bevel section 31 is close to the bottom of the bracket reinforcement plate 4 , and the other end of the bevel section 31 is welded to the side end surface of the longitudinal arm 2 or to the corner position of the side end surface of the longitudinal arm 2 .

[0030] The longitudinal arm 2 includes two stamped parts 20, which are arranged on the left and right. One of the stamped parts 20 overlaps the outer surface of the other stamped part 20. The stamped part 20 close to the wheel hub mounting bracket 3 is lower than the other stamped part 20. The cross-section of the stamped part 20 close to the wheel hub mounting bracket 3 is U-shaped.

[0031] In this solution, the longitudinal arm 2 is made of a stamping part 20, which makes the forming of the longitudinal arm 2 simple and fast; and the height of the stamping part 20 close to the wheel hub mounting bracket 3 is lower, so that the longitudinal arm 2 leaves more space for the movement of the tooling fixture.

[0032] A beam overlap section 201 with an arc-shaped cross section is stamped and formed on the stamped part 20 used for welding with the beam 1 , so that stress concentration will not occur in the weld where the longitudinal arm 2 and the beam 1 overlap.

[0033] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. The torsion beam assembly without end milling includes a crossbeam and a longitudinal arm, a wheel hub mounting bracket is fixed on the longitudinal arm, and a bracket reinforcement plate is fixed on the wheel hub mounting bracket, which is characterized by: The bracket reinforcement plate is welded to the inner end surface of the wheel hub mounting bracket, and the top section of the longitudinal arm facing the wheel hub mounting bracket is concave; The four corners of the bracket reinforcement plate are all processed with bevels, and the remaining space on the hub mounting bracket next to the bevel of the bracket reinforcement plate is used for tooling fixture positioning; The length of the wheel hub mounting bracket along the longitudinal direction of the longitudinal arm is 1 / 3-2 / 5 of the entire length of the longitudinal arm.

2. The non-end-milling torsion beam assembly according to claim 1, characterized in that: The hub mounting bracket is provided with an inclined section integrally formed with the end face, one end of the inclined section is close to the bottom of the bracket reinforcement plate, and the other end of the inclined section is welded to the side end face of the longitudinal arm or welded to the corner position of the side end face of the longitudinal arm.

3. The non-end-milling torsion beam assembly according to claim 1, characterized in that: The longitudinal arm includes two stamped parts formed by stamping, and the two stamped parts are arranged on the left and right. One of the stamped parts overlaps the outer surface of the other stamped part, and the stamped part close to the wheel hub mounting bracket is lower than the other stamped part.

4. The non-end-milling torsion beam assembly according to claim 3, characterized in that: A crossbeam overlap section with an arc-shaped cross section is formed on the stamping part used for welding with the crossbeam.

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