A processing method for preventing the end of a hollow bending-torsion rod from being flattened in an anti-roll torsion rod device

Abstract

This invention discloses a method for treating the incomplete or non-flattened end of a hollow torsion bar in an anti-roll torsion bar device. The inner cavity of the hollow torsion bar intersects with a hole drilled at its end, creating two notches (notch 1 and notch 2) on opposite sides of the inner circumferential surface of the hole. The inner cavity extends through the entire hollow torsion bar, leaving an end opening communicating with the inner cavity at the end of the hollow torsion bar. The method involves adding notch sealing structures at notches 1 and 2 to ensure sufficient contact area between the mounting hole and the connecting pin, and providing an end sealing structure at the end opening to ensure dustproof and waterproof performance. This invention ensures sufficient contact area between the mounting hole and the connecting pin, thus guaranteeing the stability of the connection structure, while also achieving dustproof and waterproof performance.

Description

Technical Field

[0001] This invention relates to a method for processing hollow torsion bars in an anti-roll torsion bar device, and more particularly to a method for treating the ends of hollow torsion bars in an anti-roll torsion bar device to prevent flattening or to prevent complete flattening, belonging to the field of anti-roll torsion bar device manufacturing technology. Background Technology

[0002] Anti-roll torsion bar devices utilize the reaction force provided by the torsional deformation of a torsion-stretched metal elastic bar to suppress the roll vibration of a vehicle without affecting its extension, yaw, pitching, bobbing, and other movements. There are two types of torsion bars in anti-roll torsion bar systems: straight torsion bars and curved torsion bars. Compared to straight torsion bars, curved torsion bars have many advantages, such as simpler structure, fewer parts, and higher stability, and are increasingly used in railway vehicle bogies.

[0003] like Figure 1 As shown, the torsion bar includes a straight rod 1 and bent rods 2 located at both ends of the straight rod. The straight rod 1 and bent rods 2 are an integral structure. The end of the bent rod 2 is flat-headed. During installation, the end of the bent rod 2 is connected to a vertical connecting rod (not shown in the figure) via a connecting pin. The torsion bar is made by bending the straight rod. To ensure that the end interface thickness D of the bent rod 2 meets the design requirements and facilitates connection to the vertical connecting rod, the manufacturing process is as follows: Figure 2 As shown, the solid round bar is first uprooted at the ends, then pierced to form a hollow straight bar 1 with an uprooted end portion 3. The uprooted end portion 3 is then either partially flattened or left unflattened. Whether to partially flatten or leave it unflattened depends on whether the final end interface thickness D meets the design requirements. If the final end interface thickness D meets the design requirements, this step can proceed with either partial flattening or skipping the flattening process, directly moving to the next bending step. After bending, as shown... Figure 3 As shown, the incompletely flattened or unflattened bulge 3 is then machined to remove parts of its opposite sides, forming the end head 4 of the bent rod 2 that conforms to the design dimensions (i.e., as shown). Figure 3 As shown, the end interface thickness D of the machined bent rod 2 meets the design dimension requirements. Figure 4 As shown, the end head 4 is then drilled to form the mounting hole 5 for installing the connecting pin, and then other processes are performed.

[0004] However, failing to completely flatten the end of the bent rod 2, or not flattening it at all, will lead to the following problems: I. For example Figure 3As shown, since the round bar will form a hollow rod with an inner cavity 6 after piercing, regardless of whether the upsetting part is partially flattened or not, the inner cavity 6 will still exist inside the rod. After subsequent drilling, as... Figure 4 As shown, the mounting hole 5 will pass through the inner cavity 6. The central axis of the mounting hole 5 is perpendicular to the central axis of the inner cavity 6. Therefore, notch 1 7 and notch 2 8 will be formed on opposite sides of the inner circumferential surface of the mounting hole 5. Notch 1 7 is closer to the end of the bent rod 2. Because notch 1 7 and notch 2 8 are formed on the inner circumferential surface of the mounting hole 5, the inner circumferential surface of the mounting hole 5 will not be complete. When the connecting pin passes through the mounting hole 5 to connect the vertical connecting rod, the contact area between the mounting hole 5 and the connecting pin will be reduced, thereby reducing the force-bearing area of ​​the mounting hole 5, resulting in increased stress, which is not conducive to the stability of the connection structure. Second, because the end of the bent rod 2 near the notch 7 is not completely flattened or not flattened at all, and because the bent rod 2 is a hollow rod, the end of the bent rod 2 will not close. Instead, an end opening 611 will be formed on the end of the bent rod 2, which communicates with the inner cavity 6. During the operation, dust or rainwater will enter the inner cavity 6 of the torsion rod through the end opening 611, thus failing to meet the requirements of dustproof and waterproof performance.

[0005] After searching, no patent documents with the same or similar technical solutions as this application were found.

[0006] In summary, how to design a method to prevent or partially flatten the ends of hollow torsion bars in an anti-roll torsion bar device, so as to ensure sufficient contact area between the mounting hole and the connecting pin, thereby ensuring the stability of the connection structure, while also meeting the requirements of dustproof and waterproof performance, is an urgent technical problem to be solved. Summary of the Invention

[0007] The first technical problem to be solved by this invention is to address the first problem mentioned in the background art, and to provide a method for treating the hollow torsion bar end in an anti-roll torsion bar device so as not to flatten or not to flatten completely, which can ensure that there is sufficient contact area between the mounting hole and the connecting pin, thereby ensuring the stability of the connection structure and meeting the requirements of dustproof and waterproof performance.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a method for treating the hollow torsion bar end not being flattened or not completely flattened in an anti-roll torsion bar device, wherein the inner cavity of the hollow torsion bar intersects with the hole formed by drilling on the end of the hollow torsion bar, so that notch one and notch two are formed on opposite sides of the inner circumferential surface of the hole, the inner cavity of the hollow torsion bar penetrates the entire hollow torsion bar, thereby leaving an end opening communicating with the inner cavity at the end of the hollow torsion bar. The treatment method is to ensure sufficient contact area between the mounting hole for installing the connecting pin and the connecting pin by adding notch sealing structures at notch one and notch two, and to ensure dustproof and waterproof performance by setting an end sealing structure at the end opening.

[0009] Preferably, when the object is not completely flattened, the specific processing steps are as follows: After obtaining the hollow straight rod with the end thickening section, a mandrel is first inserted into the inner cavity through the end opening of the hollow straight rod. Then, a partial flattening process is performed to make the mandrel fit tightly against the inner cavity wall at the end of the hollow straight rod, occupying the inner cavity at the end of the hollow straight rod and forming an end closed area. Then, bending, machining and drilling processes are performed. The drilling is carried out in the end closed area formed above. The hole formed by drilling is the mounting hole for installing the connecting pin. After drilling is completed, the mandrel is divided into mandrel part one and mandrel part two. Mandrel part one is located near the end of the bent rod. The mounting hole for installing the connecting pin is located between mandrel part one and mandrel part two. By using the above method, the mandrel forms a notch sealing structure to seal notch one and notch two, so as to ensure that there is sufficient contact area between the mounting hole and the connecting pin. The mandrel part one forms an end sealing structure to seal the end opening on the end of the hollow bent torsion bar, so as to ensure the dustproof and waterproof performance requirements.

[0010] Preferably, when not flattening, a sleeve is designed first, and the inner cavity of the sleeve is designed as the mounting hole for installing the connecting pin; After the solid round bar is end-upped, pierced, bent, machined and drilled, the sleeve is then installed into the hole formed by drilling on the end of the hollow bent torsion bar. The sleeve forms a notch sealing structure to seal notch one and notch two, so as to ensure that there is sufficient contact area between the mounting hole and the connecting pin. A sealing cap is also provided at the end opening on the end of the hollow torsion bar. The sealing cap forms an end sealing structure to block the end opening on the end of the hollow torsion bar, so as to ensure the requirements of dustproof and waterproof performance.

[0011] Preferably, the mounting hole is a tapered hole.

[0012] Preferably, the sleeve is designed with multiple mounting holes of different specifications; Before installation, select a sleeve with a suitable mounting hole size according to actual needs, and then install the sleeve into the hole formed by drilling.

[0013] Preferably, the sleeve is installed in the hole formed by drilling in a detachable manner.

[0014] Preferably, the sleeve is installed in the hole formed by drilling in a transition fit manner.

[0015] Preferably, the sealing cover includes a cover plate and a cylinder disposed on one side of the cover plate, the diameter of the cylinder matching the diameter of the inner cavity of the end of the hollow torsion bar; After the sealing cap is installed, the cylinder extends into the inner cavity at the end head. The bolt passes through the cover plate and the sealing ring and is screwed into the end face of the hollow torsion bar, thereby sealing the end opening on the end head of the hollow torsion bar.

[0016] Preferably, the sleeve includes a sleeve body and a flange portion disposed on one end of the sleeve body, and a stepped portion matching the flange portion is further disposed in the hole formed by drilling and located on one side of the end head. After the sleeve is installed in the hole formed by drilling, the flange portion presses the second sealing ring against the step portion.

[0017] The beneficial effects of this invention are as follows: This invention ensures sufficient contact area between the mounting hole and the connecting pin, thereby guaranteeing the stability of the connection structure while also meeting the requirements for dustproof and waterproof performance. When not completely flattened, the mandrel inserted into the inner cavity forms both a notch seal and an end seal in one step, improving production efficiency and meeting the requirements of mass production. When not flattened, the separately provided sleeve and sealing cap form both a notch seal and an end seal, thus ensuring the stability of the connection structure while also meeting the requirements for dustproof and waterproof performance. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of a hollow bending torsion bar in an anti-roll torsion bar device; Figure 2 This is a schematic diagram of a partial axial cross-section of the upset portion located at one end of a hollow straight rod after upsetting, in the prior art. Figure 3 This is a schematic diagram of a partial axial section of the upset portion at one end of a hollow straight rod, in the prior art, when the rod is not completely flattened or not flattened and has been machined. Figure 4This is a schematic diagram of a partial axial cross-section of the upset portion at one end of a bent rod after drilling, in the prior art. Figure 5 This is a partial axial cross-sectional view of the upset portion at one end of the hollow straight rod after the mandrel is inserted, according to Embodiment 1 of the present invention. Figure 6 This is a partial axial cross-sectional view of the upset portion at one end of the bent rod after drilling, as shown in Embodiment 1 of the present invention. Figure 7 This is a partial axial cross-sectional view of the upset portion at one end of the bent rod after drilling, as shown in Embodiment 2 of the present invention. Figure 8 for Figure 7 A schematic diagram of a partial axial cross-section of the structure located at the sealing cap; Figure 9 This is a partial axial cross-sectional view of the head of one end of the bent rod located at the sleeve in Embodiment 3 of the present invention. In the diagram: 1. Straight rod, 2. Bent rod, 3. Upset section, 4. End head, 411. Stepped section, 5. Mounting hole, 6. Inner cavity, 611. End opening, 7. Notch 1, 8. Notch 2, 9. Mandrel, 911. Mandrel section 1, 912. Mandrel section 2, 10. Sleeve, 101. Sleeve body, 102. Flange, 11. Sealing cap, 111. Cover plate, 112. Cylinder, 12. Bolt, 13. Sealing ring 1, 14. Sealing ring 2. Detailed Implementation

[0019] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] A method for addressing the issue of incomplete or non-flattened ends of hollow torsion bars in anti-roll torsion bar devices is disclosed. This method involves adding notch sealing structures at notch one and notch two to ensure sufficient contact area between the mounting hole and the connecting pin, and providing an end sealing structure at the end opening to ensure dustproof and waterproof performance. This invention ensures both sufficient contact area between the mounting hole and the connecting pin, thereby guaranteeing the stability of the connection structure, and achieving dustproof and waterproof performance.

[0021] The above processing method is divided into two cases: when the end of the hollow torsion bar is not completely flattened and when the end of the hollow torsion bar is not flattened. The following two examples will illustrate these cases respectively. Example 1:

[0022] When not completely flattened, such as Figure 5As shown, after obtaining the hollow straight rod 1 with the end-bulging section 3, a mandrel 9 is first inserted into the inner cavity 6 through the end opening 611 at the end of the hollow straight rod 1. Then, an incomplete flattening process is performed, so that the mandrel 9 fits tightly against the inner cavity wall at the end of the hollow straight rod 1, occupying the inner cavity 6 at the end of the hollow straight rod 1, forming the end closed area L. Then, bending, machining, and drilling processes are performed. During drilling, as shown... Figure 6 As shown, drilling is performed in the aforementioned closed end region L, creating the mounting hole 5 for installing the connecting pin. After drilling, the mandrel 9 is divided into mandrel part one 911 and mandrel part two 912. Mandrel part one 911 is located near the end of the bent rod 2, and the mounting hole 5 is located between mandrel part one 911 and mandrel part two 912. Using this method, the mandrel 9 forms a notch sealing structure to seal notches one 7 and two 8, ensuring sufficient contact area between the mounting hole and the connecting pin. Mandrel part one 911 forms an end sealing structure to seal the end opening on the hollow bent torsion bar, ensuring dustproof and waterproof performance. This process allows for the simultaneous formation of both notch and end sealing structures, improving production efficiency and meeting the requirements of mass production. Example 2:

[0023] When not flattened, such as Figure 7 As shown, a sleeve 10 is first designed, and the inner cavity of the sleeve 10 is designed as the mounting hole 5 for installing the connecting pin. After the solid round bar is end-headed, perforated, bent, machined and drilled, the sleeve 10 is then installed into the hole formed by drilling on the end of the hollow bent torsion bar. The sleeve 10 forms a notch sealing structure to seal notch one and notch two, so as to ensure that there is sufficient contact area between the mounting hole and the connecting pin.

[0024] Furthermore, by designing the sleeve 10 separately and installing it in the drilled hole, the inner cavity size of the sleeve 10 can be designed according to actual needs while ensuring that its outer diameter remains unchanged. This allows for the design of multiple sleeves 10 with different specifications of mounting holes 5. When a specific specification of mounting hole is needed, only the sleeve needs to be replaced during manufacturing, without having to remanufacture the entire product. This improves the versatility of this embodiment. The sleeve is installed in the drilled hole in a detachable manner. In this embodiment, the sleeve is installed in the drilled hole with an interlocking fit.

[0025] A sealing cap 11 is also provided at the end opening of the hollow torsion bar. The sealing cap 11 forms an end sealing structure to seal the end opening of the hollow torsion bar, thereby ensuring the dustproof and waterproof performance requirements. In this embodiment, since the connecting pin is tapered, the mounting hole 5 is also set as a tapered hole.

[0026] like Figure 8 As shown, the sealing cover 11 includes a cover plate 111 and a cylinder 112 disposed on one side of the cover plate 111. The diameter of the cylinder 112 matches the diameter of the inner cavity 6 at the end of the hollow torsion bar. After the sealing cover 11 is installed, the cylinder 112 extends into the inner cavity 6 at the end. The bolt 12 passes through the cover plate 111 and the sealing ring 13 and is screwed into the end face of the end of the hollow torsion bar, thereby sealing the end opening on the end of the hollow torsion bar with the sealing cover 11. Example 3:

[0027] The difference from Example 2 is that: Figure 9 As shown, the sleeve 10 includes a sleeve body 101 and a flange portion 102 disposed on one end of the sleeve 10. In the hole formed by drilling and located on one side of the end head 4, a step portion 411 matching the flange portion 102 is also provided. After the sleeve 10 is installed in the hole formed by drilling, the flange portion 102 presses the sealing ring 14 into contact with the step portion 411, thereby forming a sealing structure at this location to further ensure the dustproof and waterproof performance requirements at this location.

[0028] In summary, this invention ensures sufficient contact area between the mounting hole and the connecting pin, thereby guaranteeing the stability of the connection structure while also meeting the requirements for dustproof and waterproof performance. When not completely flattened, the mandrel inserted into the inner cavity forms both a notch seal and an end seal in one step, improving production efficiency and meeting the requirements of mass production. When not flattened, the separately provided sleeve and sealing cap form both a notch seal and an end seal, thus ensuring the stability of the connection structure while also meeting the requirements for dustproof and waterproof performance.

[0029] In this embodiment, "multiple" refers to "two or more". The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the protection scope of this invention, which is defined by the claims.

Claims

1. A method for processing the end portion of a hollow torsion beam of a side roll resistant torsion beam device without flattening, wherein the inner cavity of the hollow torsion beam intersects a hole formed by drilling on the end portion of the hollow torsion beam, such that a notch one and a notch two are formed on the opposite sides of the inner peripheral surface of the hole, the inner cavity of the hollow torsion beam extends through the entire hollow torsion beam, thereby leaving an end opening on the end portion of the hollow torsion beam which communicates with the inner cavity, characterized in that: The method described above is to ensure sufficient contact area between the mounting hole for installing the connecting pin and the connecting pin by adding a notch sealing structure at notch one and notch two, and to ensure dustproof and waterproof performance by setting an end sealing structure at the end opening. ​ When not flattening, first design a sleeve, and design the inner cavity of the sleeve as the mounting hole for installing the connecting pin; After the solid round bar is end-upped, pierced, bent, machined and drilled, the sleeve is then installed into the hole formed by drilling on the end of the hollow bent torsion bar. The sleeve forms a notch sealing structure to seal notch one and notch two, so as to ensure that there is sufficient contact area between the mounting hole and the connecting pin. A sealing cap is also provided at the end opening on the end of the hollow torsion bar. The sealing cap forms an end sealing structure to block the end opening on the end of the hollow torsion bar, so as to ensure the requirements of dustproof and waterproof performance. The sealing cover includes a cover plate and a cylinder disposed on one side of the cover plate, the diameter of which matches the diameter of the inner cavity of the end of the hollow torsion bar. After the sealing cap is installed, the cylinder extends into the inner cavity at the end head. The bolt passes through the cover plate and the sealing ring and is screwed into the end face of the hollow torsion bar, thereby sealing the end opening on the end head of the hollow torsion bar.

2. The processing method according to claim 1, characterized in that: The mounting hole is configured as a tapered hole.

3. The processing method according to claim 1, characterized in that: The sleeve is designed with multiple mounting holes of different specifications; Before installation, select a sleeve with a suitable mounting hole size according to actual needs, and then install the sleeve into the hole formed by drilling.

4. The processing method according to claim 1, characterized in that: The sleeve is installed in the hole formed by drilling in a detachable manner.

5. The processing method according to claim 4, characterized in that: The sleeve is installed in the hole formed by drilling using an intermediate fit.

6. The processing method according to any one of claims 1 to 5, characterized in that: The sleeve includes a sleeve body and a flange portion disposed on one end of the sleeve. In the hole formed by drilling and located on one side of the end head, a step portion matching the flange portion is also provided. After the sleeve is installed in the hole formed by drilling, the flange portion presses the second sealing ring against the step portion.

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