Torsion bar shaft, lightweight anti-roll torsion bar, metal pipe hole processing technology

Abstract

The application discloses a torsion bar shaft, a lightweight anti-rolling torsion bar and a metal pipe hole processing technology. The torsion bar shaft comprises a metal pipe and a fiber layer which is bonded to the outer periphery of the metal pipe. The lightweight anti-rolling torsion bar comprising the torsion bar shaft further comprises torsion arms at both ends of the torsion bar shaft and an end connecting body. The torsion arms are formed by extending and bending the metal pipe of the torsion bar shaft. The end connecting body comprises a swing arm connecting part and a pull rod connecting part. The swing arm connecting part is connected with the end of the torsion arm, and the pull rod connecting part is connected with the pull rod. The metal pipe hole processing technology comprises the following steps: S1, performing cylindrical processing on a rod to be processed; S2, clamping the rod by reversing the direction, and drilling a hole one and a hole two which are communicated from the A end and the B end of the rod respectively; and S3, positioning and clamping the rod with the axis line one and the axis line two as the pipe hole axis lines, and performing turning on the outer periphery of the rod to make the wall thickness uniform.

Description

Technical Field

[0001] This invention relates to a torsion bar shaft, a lightweight anti-roll torsion bar, and a metal tube hole machining process, belonging to the field of anti-roll torsion bar machining technology. Background Technology

[0002] Anti-roll torsion bars are cylindrical rods installed between the train body and the bogies. They resist the train body from rolling to one side by applying a predetermined torsional force when encountering strong crosswinds or centrifugal forces during train operation. Existing anti-roll torsion bars are all solid structures, weighing tens to hundreds of kilograms. Since a train may have dozens of anti-roll torsion bars, with a total weight of several tons, and considering the long operating distances and extended periods, this results in significant energy consumption. Therefore, lightweighting anti-roll torsion bars is of great significance for achieving energy conservation and emission reduction in train operation.

[0003] To solve the above problems, the industry first thought and attempted to adopt hollow torsion bars.

[0004] Patent application number 201510724528.8 discloses a composite material anti-roll torsion bar device for rail transit vehicles, comprising a torsion bar shaft, a torsion arm, a support seat, and a vertical connecting rod. The torsion arm is fixed to the torsion bar shaft, which is fixed to the vehicle frame via a mounting seat. The vertical connecting rod is connected to the torsion arm via a node. The torsion bar shaft, vertical connecting rod, and support seat are made of fiber-based epoxy resin composite material. The torsion bar shaft and vertical connecting rod are manufactured using a metal mandrel or a fusible mandrel. Long fibers impregnated with epoxy resin are wound layer by layer onto the metal mandrel or fusible mandrel on a winding machine using a mechanical tensioner. After curing, the mandrel is demolded or melted. The support seat is made of integrally molded fiber-based epoxy resin. A special molding die is designed and used for molding the support seat according to the product's structural dimensions and installation interface requirements. This invention uses fiber-based epoxy resin composite material to replace the original metal parts, reducing the overall weight by 40%. The process is simple, and the quality is easy to control, achieving a lightweight anti-roll torsion bar system.

[0005] Furthermore, invention patent application number 202110083768.X discloses an anti-roll torsion bar and an anti-roll torsion bar molding process. The anti-roll torsion bar includes a torsion shaft and a torsion arm. The torsion shaft includes a core tube made of fiber composite material and metal connectors connected to both ends of the core tube. The metal connectors include a first segment and a second segment connected together. The first segment is connected to the core tube. The torsion arm includes a torsion arm core made of metal. The second segment is inserted into the torsion arm. A first fiber composite material layer is wound around the outer periphery of the core tube and the first segment. The torsion shaft also includes a second fiber composite material layer, which is wound at least around the inserted torsion arm core and the second segment. In this solution, the torsion arm and torsion shaft meet the requirements of lightweight design, and the insertion connection maintains the reliability of the mechanical connection, ensuring that the torsion arm and torsion shaft are not easily disengaged when subjected to torsion.

[0006] The torsion bar shaft and torsion shaft involved in the above two patents are the straight sections of the main body of the anti-roll torsion bar, hereinafter collectively referred to as the torsion bar shaft of the anti-roll torsion bar. Both patents disclose a technical solution that uses fiber composite materials to manufacture the torsion bar shaft, thereby reducing the weight of the anti-roll torsion bar. However, the molding processes of the anti-roll torsion bars disclosed in both patents require molding the entire torsion bar shaft on a specific mold, without using an initial support foundation as part of the product. This not only increases the difficulty of initial molding and subsequent demolding of the torsion bar shaft, but also makes it difficult to control the winding direction of the warp fibers in the fiber cloth, thus making it difficult to better meet the stress requirements of the torsion bar shaft during torsion and bending. Summary of the Invention

[0007] The technical problem to be solved by this invention is: how to achieve lightweight anti-roll torsion bar and make the anti-roll torsion bar, especially the torsion bar shaft, better meet the stress requirements under torsion and bending.

[0008] The basis for the lightweight anti-roll torsion bar of this invention is hollowing, that is, firstly, solid metal rods are processed into tubular bodies, and then the tubular bodies are bent to form hollow anti-roll torsion bars with tubular torsion bar shafts in the middle and torsion arms at both ends.

[0009] Since the torsion arm manufactured in this way is a torsion arm, and a torsion arm cannot be directly connected to the tie rod, this invention also needs to solve the problem of how to design the tie rod connection part at the outer end of the torsion arm after the anti-roll torsion bar is hollowed out.

[0010] To ensure the torsional stiffness of the metal tube, the centerline of the hole drilled along the axis of the metal tube must coincide with the axis of the metal tube at the same height. In other words, the thickness of the hole wall must be consistent. Otherwise, when subjected to large torque or bending moment, the thin-walled part will deform or even break.

[0011] However, in the drilling process, due to unavoidable precision errors, the drill bit's axis and the machine tool's machining axis cannot be perfectly aligned when clamping a long drill bit. Even with extremely precise clamping, a slight angle cannot be avoided between the drill bit's axis and the machining axis. This angle is extremely small, making it difficult to measure its direction of deflection and the amount of offset of the end from the machining axis after clamping. Thus, when using a long drill bit for long-distance drilling, as the drilling length increases, the end of the hole's axis will deviate from the axis of the machined shaft in a certain direction, causing the hole wall to thin in that direction, resulting in a defective product. Therefore, in the process of achieving hollow anti-roll torsion bars, this invention also needs to solve the problem of inconsistent hole wall thickness that occurs in the drilling process.

[0012] To address the above problems, the technical solution provided by this invention is: A torsion bar shaft includes a metal tube and a fiber layer bonded with adhesive around the periphery of the metal tube.

[0013] At both ends of the metal tube, there are several radially outward protruding teeth for holding the weft threads of the fiber strips and for bearing tensile stress on the warp threads.

[0014] The hanging teeth are arranged in a circumferential multi-row and axial multi-column manner to ensure that the fiber strip is wound at a -45° to 45° angle with the axis of the torsion bar shaft and then hooks the hanging teeth at both ends of the metal tube.

[0015] A lightweight anti-roll torsion bar including the above-mentioned torsion bar shaft, further comprising torsion arms at both ends of the torsion bar shaft, wherein the torsion arms are formed by extending and bending the metal tube of the torsion bar shaft to both ends.

[0016] It also includes an end connector for the torsion arm, the end connector comprising a swing arm connector and a tie rod connector, the swing arm connector being connected to the end of the torsion arm, and the tie rod connector being connected to a tie rod.

[0017] The swing arm connection has a connection hole that allows the end of the swing arm to enter.

[0018] The torsion arm end is inserted into the connecting hole of the rotating arm connecting part through an interference fit to achieve the connection between the torsion arm and the end connecting body; or, the inner wall of the connecting hole of the rotating arm connecting part is provided with an internal thread, the outer circumference of the end of the torsion arm is provided with an external thread, and the end of the torsion arm is screwed into the connecting hole of the rotating arm connecting part through a threaded fit to achieve the connection between the torsion arm and the end connecting body.

[0019] A process for machining the bore of a lightweight anti-roll torsion bar metal tube as described above includes the following steps: S1. Perform cylindrical machining on the rod to be machined so that any cross-section is a circle and the center of the circle is located on the axis of the rod. S2. By turning the clamping rod around and reversing its direction, use the same drill bit installed on one side of the machine tool to drill through the connecting holes 1 and 2 from both ends A and B of the rod, and make the axis line 1 of hole 1 and the axis line 2 of hole 2 on the same straight line. S3. Position and clamp the rod with axis line one and axis line two as the axis of the pipe hole, and rotate the rod around the axis of the pipe hole to machine the outer circumference of the rod until the wall thickness at any point in the pipe hole is the set standard wall thickness. Beneficial effects

[0020] 1. The hollowing out of the metal tube in the torsion bar shaft achieves the weight reduction of the torsion bar shaft, and the fiber layer wrapped around the metal tube ensures the strength and toughness that the torsion bar shaft should have; 2. The fiber layer is made by wrapping fiber strips around a metal tube and applying adhesive, which not only reduces the initial molding difficulty of the fiber anti-roll torsion bar, but also facilitates demolding later. 3. By implanting teeth at both ends of the metal tube, the integrity of the metal tube and its outer fiber coating layer under stress is enhanced. 4. The hollowing out of the metal tube in the anti-roll torsion bar achieves the weight reduction of the anti-roll torsion bar. At the same time, the end connector solves the problem that the torsion arm of the hollow anti-roll torsion bar cannot be directly connected to the tie rod 5. 5. Drilling holes in solid rods to make metal tubes ensures that the metal tube material is uniform and consistent. Furthermore, the subsequent machining after drilling ensures that the wall thickness is uniform throughout the hole, thus avoiding weak points in the metal tube that are prone to deformation or breakage. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the anti-roll torsion bar; Figure 2 This is a partial cross-sectional schematic diagram of the anti-roll torsion bar; Figure 3 for Figure 2 A partial schematic diagram; Figure 4 This is a three-dimensional schematic diagram of the toothed sleeve; Figure 5 This is a schematic diagram showing the unfolded surface of the implant segment, with the fiber strips wrapped at 45°. Figure 6 This is a schematic diagram showing the unfolded surface of the implant segment, with the fiber strips wound at a -45° angle. Figure 7 This is a schematic diagram showing the unfolded surface of the implant segment, with the fiber cloth strips wound at 0°. Figure 8 This is a three-dimensional schematic diagram of the toothed sleeve, showing the reinforcing rows; Figure 9This is a schematic diagram showing the unfolded surface of the implant segment with reinforcement, where the fiber strips are wound at 45°. Figure 10 This is a schematic diagram showing the unfolded surface of the implant segment with reinforcement, where the fiber strips are wound at a -45° angle. Figure 11 This is a schematic diagram showing the unfolded surface of the implant segment with reinforcement, where the fiber strips are wound at 0°. Figure 12 This is a three-dimensional schematic diagram of the anti-roll torsion bar. In the diagram, the torsion arm at one end of the anti-roll torsion bar is separated from the end connector for easy reference. Figure 13 This is a cross-sectional schematic diagram of one end of the anti-roll torsion bar; Figure 14 This is a schematic diagram showing the disassembly of the end connector; Figure 15 This is a three-dimensional schematic diagram of the end connector and the pull rod to be assembled. Figure 16 This is a three-dimensional schematic diagram of the end connector and the tie rod after assembly; Figure 17 This is a cross-sectional schematic diagram of one end of the anti-roll torsion bar, showing that the swing arm connection is the end connector of the connecting rod; Figure 18 This is a schematic diagram of the end connector being connected to the torsion arm by riveting. The diagram shows that the outer periphery of the torsion arm end has anti-detachment corrugations. Figure 19 This is a three-dimensional schematic diagram of the rod. Figure 20 The figure shows a cross-sectional view of the rod after holes one and two are drilled at both ends. The axis lines of holes one and two are on the same straight line. Figure 21 for Figure 20 The diagram shows a cross-sectional view of a metal tube machined with the axis of hole one and hole two as the axis. Figure 22 This is a three-dimensional schematic diagram of the experimental rod; Figure 23 for Figure 22 A magnified view of a portion of the image; Figure 24 This is a schematic diagram of a scaled view based on the experimental rod. Figure 25 This is a three-dimensional schematic diagram of the experimental rod, showing the tool entry point x2 at end B; Figure 26 This is a three-dimensional schematic diagram of the rod, showing the positions of the tool entry points x1 and x2 at both ends of the rod A and B; Figure 27This is a three-dimensional schematic diagram of the rod, showing a hole drilled from the entry point x1 at end A of the rod; Figure 28 This is a three-dimensional schematic diagram of the rod, showing the second hole drilled from the entry point x2 at end B of the rod; Figure 29 A three-dimensional schematic diagram of a metal tube machined with the center lines of holes one and two as the axes. Figure 30 This is a three-dimensional schematic diagram of the rod, showing the differences between the tool entry points x1 and x2 at both ends of the rod A and B. Figure 27 The location shown; Figure 31 This is a three-dimensional schematic diagram of the rod, showing the arrangement of the rods. Figure 30 The holes 1 and 2 drilled at the entry points x1 and x2 at both ends of rods A and B are shown; Figure 32 This is a three-dimensional schematic diagram of the stress on an existing anti-roll torsion bar. The diagram shows that when the left end torsion arm of the anti-roll torsion bar is subjected to an upward tension F1 from the tie rod, the right end torsion arm is subjected to a downward pressure F2 from the tie rod.

[0022] It should be noted that the names and reference numerals of the rod, experimental rod, and scaled view of the experimental rod are completely consistent. For example, the A end and B end of the rod are the same in the experimental rod and the scaled view.

[0023] In the diagram: 100, anti-roll torsion bar; 1, torsion bar shaft; 11, metal tube; 111, tube hole; 1111, tube hole axis; 12, fiber layer; 121, fiber strip; 1211, warp; 1212, weft; 2, torsion arm; 21, end hole; 3, gear sleeve; 31, half sleeve one; 32, half sleeve two; 33, fastening bolt; 34, fastening section; 35, wrapping surface; 36, toothed section; 37, transition section; 4. Hook tooth; 41. First basic row; 42. Second basic row; 43. Reinforcing row; 5. End connector; 51. Swing arm connector; 511. Connecting hole; 512. Anti-detachment outer corrugation; 513. Connecting rod; 52. Pull rod connector; 521. Outer half sleeve one; 5211. Left fixing foot one; 52111. Left screw hole one; 5212. Right fixing foot one; 52121. Right screw hole one; 522. Outer half sleeve two 5221. Left fixed foot two; 52211. Left screw hole two; 5222. Right fixed foot two; 52221. Right screw hole two; 523. Front inner half sleeve; 524. Rear inner half sleeve; 525. Wear-resistant bushing one; 526. Wear-resistant bushing two; 527. Pin hole; 528. Joint ball; 529. Screw; 6. Pull rod; 61. Left connecting post; 611. Left screw hole; 62. Right connecting post; 621. Right screw 7. Hole; 701. Rod; 7011. Experimental Rod; 7011. Scale View; 71. Hole 1; 711. Axis Line 1; 72. Hole 2; 721. Axis Line 2; 73. End A; 731. Center of End A; 732. Clamping Direction of End A; 74. End B; 741. Center of End B; 742. Clamping Direction of End B; 75. Rod Axis Line; 76. Tool Exit Port; 77. Offset Direction; 78. Line Segment; 8. Support Base. Detailed Implementation

[0024] like Figure 32 As shown, an anti-roll torsion bar is a rod installed between the train body and the bogie to resist the side roll of the car body to one side with a set torsional force. It consists of a torsion bar shaft 1 with a central texture and torsion arms 2 at both ends. The torsion bar shaft 1 and the torsion arms 2 form an angle of about 90°. In application, the anti-roll torsion bar 100 is mounted on the train bogie in a torsion manner at both ends of the torsion bar shaft 1 via support seats 8. The outer ends of the two torsion arms 2 are connected to the two sides of the car body via tie rods 6. When the train encounters strong crosswinds or centrifugal force on a large curve during operation, the car body rolls. The outer end of the torsion arm 2 at one end of the anti-roll torsion bar 100 is subjected to a tension force from one side of the car body via tie rod 6, and the outer end of the torsion arm 2 at the other end is subjected to a pressure force from one side of the car body via tie rod 6. This causes the two ends of the torsion bar shaft 1 to be subjected to opposite torsional forces. The torsion bar shaft 1 must resist the opposite torsional forces at both ends with its own rotational elasticity to achieve the function of resisting the side roll of the car body.

[0025] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1

[0026] like Figure 1 , 2 As shown, a torsion bar shaft 1 includes a metal tube 11 and a fiber layer 12 bonded with adhesive around the outer periphery of the metal tube 11. Since the metal tube 11 is hollow, the weight of the torsion bar shaft 1 is directly reduced. Furthermore, the density of the fiber composite material is much lower than that of metal, resulting in a significant reduction in the overall weight of the anti-roll torsion bar. Simultaneously, because the fiber layer encapsulates the metal tube 11, the torsion bar shaft 1 possesses structural strength far exceeding that of torsion bar shafts made from pure fiber composite materials in existing technologies, exhibiting strength and toughness comparable to pure metal torsion bars. Moreover, since this design uses the metal tube 11 as a basic support, during manufacturing, it is only necessary to fix the two ends or the torsion arms 2 of the metal tube 11 with clamps. Fiber strips 121 can then be wrapped around the outer periphery of the metal tube 11 and adhesive applied until the fiber layer 12 is formed. Afterward, the clamps are released, which not only reduces the initial molding difficulty of the fiber anti-roll torsion bar but also facilitates subsequent demolding.

[0027] As a preferred option, the metal pipe is made of high-quality steel.

[0028] like Figure 3 , 4 As shown, furthermore, at both ends of the metal tube 11, there are several radially outward protruding teeth 4 for holding the weft threads 1212 of the fiber strip 121 and for subjecting the warp threads 1211 to tensile stress. Since the warp threads 1211 and weft threads 1212 of the fiber strip 121 are interwoven and glued together as a whole, when the teeth 4 hold the weft threads 1212, the warp threads 1211 can be stressed. In this way, when the torsion bar shaft 1 twists or bends, the fiber layer 12 cannot detach from the metal tube 11, ensuring the absolute integrity of the torsion bar shaft 1 under stress.

[0029] like Figure 3 As shown in Figure 7, the hanging teeth 4 are arranged in a circumferential multi-row and axial multi-column pattern, satisfying the condition that the fiber strip 121 is wound at a -45° to 45° angle with the axis of the torsion bar shaft 1, and the two ends of the fiber strip 121 are respectively hooked onto the hanging teeth 4 at both ends of the metal tube 11, such as: 0° winding, the fiber strip 121 is pasted on the outer periphery of the metal tube 11 parallel to the axis and the two ends are hooked with the hanging teeth 4. When the torsion bar shaft 1 is bent, the fiber strip 121 on the side opposite to the bending direction is subjected to tensile stress, which improves the bending strength of the torsion bar shaft 1. After being wound at 45° or 30°, the two ends are hooked onto the hanging teeth 4. When the torsion bar shaft 1 is twisted in the positive direction, it is wound at 45° or 30°. In particular, the warp 1211 of the fiber strip 121 wound at 45° is most consistent with the direction of torsion. The warp 1211 of the fiber strip 121 provides torsional stiffness guarantee in this direction of torsion. After being wound at -45° or -30°, the two ends are hooked onto the gear 4. When the torsion bar shaft 1 is twisted in the opposite direction, it is wound at -45° or -30°. In particular, the warp 1211 of the fiber strip 121 wound at -45° is most consistent with the direction of torsion under tension. The warp 1211 of the fiber strip 121 provides torsional stiffness guarantee in this direction of torsion.

[0030] The hanging teeth 4 are arranged in a two-row, multi-column array. The two rows include a first basic row 41 and a second basic row 42. The hanging teeth 4 in the first basic row 41 correspond to the hanging teeth 4 in the second basic row 42. When the fiber strip 121 is wound at 0°, 45°, and -45°, the same warp 1211 at one end of the torsion bar shaft 1 is subjected to tensile stress simultaneously provided by the two hanging teeth 4 located in the first basic row 41 and the second basic row 42. It has been determined that the tensile stress shared by the two hanging teeth 4 on the same warp 1211 can prevent tearing and fix the fiber strip 121 at the end.

[0031] In addition to the above-mentioned winding method, this application also involves winding at 90° to the axis of the torsion bar shaft 1, that is, circumferentially winding the fiber strips 121 wound at the above-mentioned angles, so as to achieve circumferential positioning and compression of the fiber strips 121 wound at the above-mentioned angles, and strengthen the integrity of the entire fiber layer 12 and the metal tube 11.

[0032] Furthermore, the hanging teeth 4 are arranged on the outer circumference of a toothed sleeve 3 that fits onto the metal tube 11, and the toothed sleeve 3 is fixedly connected to the metal tube. The toothed sleeve 3 is a two-part bolt fastening structure, consisting of half-sleeve 1 31 and half-sleeve 2 32 and a fastening bolt 33. The section of half-sleeve 1 31 and half-sleeve 2 32 near the support base 8 is the fastening section 34 for closing and fastening, and the other section is the tooth-planting section 36 where the hanging teeth 4 are arranged. With this design, it is not necessary to plant teeth on the metal tube 11, thereby reducing the manufacturing difficulty of the metal tube 11.

[0033] Furthermore, the toothed section 36 near the fastening section 34 has an arc-shaped outer periphery that forms a wrapping surface 35 to resist the shrinkage of the fiber layer 12 towards the middle section of the torsion bar shaft 1 when it is under force, so that the two ends of the fiber layer 12 cannot shrink towards the middle. The other end has a tapered transition section 37 that gradually shrinks towards the middle section of the torsion bar shaft 1. Example 2

[0034] like Figure 8As shown in Figure 11, the difference from Embodiment 1 is that a reinforcing row 43 is added between the first basic row 41 and the second basic row 42, so that when the fiber strip 121 is wound at 45° and -45°, the same warp 1211 at one end of the torsion bar shaft 1 is subjected to tensile stress simultaneously provided by three hooks 4 located in the first basic row 41, the reinforcing row 43, and the second basic row 42. In this way, the same warp 302 can share the tensile stress simultaneously by the three hooks 4, which can more firmly fix the fiber strip 121 at the end. Example 3

[0035] Reference Figure 3 —11, A method for ensuring the stiffness of the torsion bar shaft of an anti-roll torsion bar device is to wrap multiple fiber strips 121 around the outside of a metal tube 11 at opposite angles relative to the axis of the torsion bar shaft 1, apply adhesive, and then axially attach the fiber strips 121 at zero angles relative to the axis of the torsion bar shaft 1, with both ends of all fiber strips 121 connected and rooted to the hanging teeth 4 at both ends, thereby forming a fiber layer 12 that enhances the torsional stiffness and bending stiffness of the torsion bar shaft 1, mainly provided by the warp threads 1211 in the fiber strips 121.

[0036] Preferably, the fiber layer 12 comprises a 45° winding layer, a -45° winding layer, a 0° winding layer, and a 90° winding layer, all unidirectionally wound from fiber strips 121. The 45° and -45° winding layers improve the shear strength and stiffness of the torsion bar shaft 1, the 0° winding layer improves the tensile strength and stiffness of the torsion bar shaft 1, and the 90° winding layer improves the compressive strength and stiffness of the torsion bar shaft 1. Example 4

[0037] like Figure 12 , 13 As shown, a lightweight anti-roll torsion bar including the aforementioned torsion bar shaft 1 further includes torsion arms at both ends of the torsion bar shaft 1. Each torsion arm is a tubular torsion arm 2 formed by extending and bending a metal tube 11 of the torsion bar shaft 1 at both ends. In other words, this lightweight anti-roll torsion bar is a hollow rod, with its torsion bar shaft 1 covered by fibers, thus exhibiting light weight. However, the torsion bar shaft 1, as the torsion part, possesses sufficient structural strength and torsional stiffness meeting design requirements. Because the torsion arms 2 are relatively short and have strong resistance to bending deformation, fiber covering is unnecessary.

[0038] The aforementioned lightweight anti-roll torsion bar also includes an end connector 5 for the torsion arm 2. The end connector 5 includes a swing arm connector 51 and a tie rod connector 52. The swing arm connector 51 is connected to the end of the torsion arm 2, and the tie rod connector 52 is connected to the tie rod 6. In this way, by providing the end connector 5 for the torsion arm, the problem that the torsion arm 2 of the hollow anti-roll torsion bar 100 cannot be directly connected to the tie rod 6 is solved.

[0039] The rotating arm connecting part 51 has a connecting hole 511 that allows the end of the torsion arm 2 to enter. In the connected state, the end of the torsion arm 2 is located inside the connecting hole 511.

[0040] The torsion arm 2 has three possible configurations when its end is located within the connection hole 511: Method 1: The end of the torsion arm 2 is inserted into the connection hole 511 of the torsion arm connection part 51 through an interference fit, thereby realizing the connection between the torsion arm 2 and the end connector 5.

[0041] Method 2: The inner wall of the connecting hole 511 of the rotating arm connecting part 51 is provided with internal thread, and the outer circumference of the end of the torsion arm is provided with external thread. The end of the torsion arm 2 is screwed into the connecting hole 511 of the rotating arm connecting part 51 through thread engagement to realize the connection between the torsion arm 2 and the end connecting body 5.

[0042] Method 3: For example Figure 14 As shown, the outer periphery of the end of the torsion arm 2 has an anti-detachment outer corrugation 512, and the inner wall of the connection hole 511 of the rotating arm connection part 51 has an anti-detachment inner corrugation (not shown in the figure) formed by the deformation of the anti-detachment outer corrugation 512 during hot pressing and riveting. The torsion arm 2 and the connection hole 511 of the rotating arm connection part 51 are connected by hot pressing and riveting.

[0043] The hot-press riveting method here is as follows: the swing arm connecting part 51 is heated and softened, the end of the torsion arm 2 with the anti-detachment outer corrugation 512 is inserted into the connecting hole 511 of the swing arm connecting part 51, and the outer mold is used to apply a radially concentric compression force on the outer periphery of the swing arm connecting part 51, so that the inner wall of the connecting hole 511 adapts to the anti-detachment outer corrugation 512 on the outer periphery of the torsion arm 2 and makes a corresponding deformation to form an anti-detachment inner corrugation that engages with the anti-detachment outer corrugation 512. After cooling, the connection between the end connector 5 and the torsion arm 2 is achieved.

[0044] The pull rod connecting part 52 is a disc-shaped body with its axis parallel to the axis of the torsion bar shaft 1. The disc-shaped body is provided with a pin hole 527 with its axis parallel to the axis of the torsion bar shaft 1 for connecting with the pull rod 6. Example 5

[0045] like Figure 15 , 16 As shown in Figure 17, the difference between this embodiment and Embodiment 4 is that the tie rod connection 52 is a ball joint component, which includes a ball joint 528 and an annular joint sleeve surrounding the outer circumference of the ball joint 528. Both sides of the ball joint 528 are exposed on both sides of the joint sleeve. A connecting hole 511 is located on the ball joint 528 exposed on one side of the annular joint sleeve. The joint sleeve is connected to the tie rod 6. Unlike the tie rod connection 52 in Embodiment 4, the tie rod 6 can rotate in multiple directions via the joint sleeve and the ball joint 528, making it more suitable for the force conditions between the tie rod 6 and the torsion arm 2. In this embodiment, the tie rod connection 52 is only the area where the connecting hole 511 is located on the ball joint 528.

[0046] For ease of assembly, the joint sleeve is designed in two halves. Specifically, the joint sleeve includes a semi-circular outer half sleeve 1 521 and outer half sleeve 2 522, as well as a circular front inner half sleeve 523 and rear inner half sleeve 524. The outer half sleeve 1 521 has a left fixing foot 1 5211 and a right fixing foot 1 extending radially outward on its left and right sides, respectively. The left fixing foot 1 5211 and the right fixing foot 1 are respectively provided with a left screw hole 1 52111 and a right screw hole 1 52121. The outer half sleeve 2 522 has a left fixing foot 2 5221 and a right fixing foot 2 extending radially outward on its left and right sides, respectively. The left fixing foot 2 5221 and the right fixing foot 2 are respectively provided with a left screw hole 1 52111 and a right screw hole 1 52121. The second rod hole 52211 and the second right screw hole 52221, the front inner half sleeve 523 and the rear inner half sleeve 524 are respectively fastened to the front and rear of the middle area of ​​the joint ball 528. The first outer half sleeve 521 and the second outer half sleeve 522 are fastened to the outside of the front inner half sleeve 523 and the rear inner half sleeve 524. The first left fixing foot 5211 is attached to the second left fixing foot 5221. The first left screw hole 52111 and the second left screw hole 52211 are connected to allow the screw 529 to pass through and be tightened. The first right fixing foot 5212 is attached to the second right fixing foot 5222. The first right screw hole 52121 and the second right screw hole 52221 are connected to allow the screw 529 to pass through and be tightened.

[0047] Corresponding to the above configuration, one end of the tie rod 6 has a left connecting post 61 and a right connecting post 62 integrally formed with the tie rod 6 and arranged in a clamp shape. The bottom end faces of the left connecting post 61 and the right connecting post 62 have axially arranged left screw hole 611 and right screw hole 621, which correspond to left screw hole 52111 and right screw hole 52121, respectively. Thus, during assembly, only two screws 529 are needed to assemble the ball joint component and directly connect the end connector 5 to the tie rod 6. If two screws 529 were used separately to fix the outer half-sleeve 1 521 and outer half-sleeve 2 522 to complete the ball joint component assembly, and then a connector was used to connect the ball joint component to the tie rod 6, more components and a more complex structural configuration would be required, contradicting the design principles of simplicity, rationality, and efficiency.

[0048] Furthermore, a semi-annular wear-resistant bushing 525 and a wear-resistant bushing 526 are provided between the joint sleeve and the joint ball 528 to increase the durability and flexibility of the ball joint component. Example 6

[0049] like Figure 18 As shown, the difference between this embodiment and embodiment four is that the rotating arm connecting part 51 is a connecting rod 513 that can be inserted into the end hole 21 of the torsion arm 2. The connecting rod 513 is inserted into the end hole 21 of the torsion arm 2 with an interference fit to realize the connection between the torsion arm 2 and the end connecting body 5.

[0050] Of course, the connecting rod 513 and the end hole 21 of the torsion arm 2 can also be connected by hot pressing riveting as in Embodiment 1. Example 7

[0051] like Figure 19 , 20 As shown in Figures 21, 27, 28, and 29, a process for machining the bore of a metal tube as described above includes the following steps: S1. Perform cylindrical machining on the rod 7 to be machined, so that any cross-section is a circle and the center of the circle is located on the axis 75 of the rod. S2. By reversing the direction of the clamping rod 7, the same drill bit installed on one side of the machine tool is used to drill through the A and B ends of the rod 7 respectively, making the axis line 711 of the first hole 71 and the axis line 721 of the second hole 72 on the same straight line, that is, making the first hole 71 and the second hole 72 form the tube hole 111 of the metal tube 11, and the axis line 711 and the axis line 721 are the axis line 1111 of the tube hole; S3. Position and clamp the rod 7 with the first axis 711 and the second axis 721 as the pipe hole axis 1111, and rotate the rod 7 around the pipe hole axis 1111 to machine the outer circumference of the rod 7 until the wall thickness at any point of the pipe hole 111 is the set standard wall thickness.

[0052] Thus, Hole 1 71 and Hole 2 72 become a complete tube hole 111 of the metal tube 11. Due to unavoidable errors in drill bit clamping and drilling, the tube hole axis 1111 drilled in step S2 forms an angle with the cylindrical rod axis 75, or even has no intersection. This inevitably leads to uneven wall thickness at various points of the tube hole 111. By re-turning the outer periphery of the rod with the tube hole axis 1111 as the axis in step S3, a metal tube 11 with uniform wall thickness is obtained. At the same time, since the metal tube is made by drilling holes in a solid rod, it can ensure that the material of the entire metal tube is uniform, thereby avoiding weak parts that are prone to deformation and breakage.

[0053] like Figure 22 , 23 As shown, achieving the goal of making the centerline 711 of hole 71 and the centerline 721 of hole 72 collinear in S2 includes the following steps: a1. Predetermine the offset direction of the drill bit during actual drilling and the offset amount y of the center x of the drill bit's exit port 76 from the axis 75 of the rod. a2. Based on the offset direction obtained in a1, determine the clamping direction 732 at end A and the clamping direction 742 at end B of the rod 7 to be processed. Based on the offset y obtained in a1, determine the positions of the tool entry point x1 at end A 73 and the tool entry point x2 at end B 74 of the rod 7. Ensure that the axis 711 of the first hole 71 and the second hole 72 drilled from the tool entry points x1 and x2 at both ends of the rod 7 are parallel to the axis 721. Ensure that the tool exit port 76 of the first hole 71 and the tool exit port 76 of the second hole 72 coincide and have a common center x. a3. Drilling, including the following steps: 1) Clamp rod 7 according to the clamping direction 732 at end A as determined by a2, and drill a hole from end A of rod 7 at the entry point x1 determined by a2; 2) Turn around and change direction. Clamp rod 7 according to the clamping direction 742 at end B as determined by a2. Drill hole from end B of rod 7 according to the entry point x2 determined by a2.

[0054] like Figure 28 As shown, since the center of the cutting port of hole 71 is on axis line 711 and the center of the cutting port of hole 72 is on axis line 721, axis line 711 and axis line 721 are parallel, and the center of the cutting port of hole 71 and the center of the cutting port of hole 72 coincide at a point x, these conditions have actually made axis line 711 and axis line 721 lie on a straight line, and hole 71 and hole 72 become a straight pipe hole 111.

[0055] like Figure 22 , 23 As shown, obtaining the offset direction 77 of the drill bit described in a1 during actual drilling and the offset y of the center x of the drill bit's exit port 76 from the axis 75 of the rod is achieved by using a cylindrical rod 7 as the experimental rod 701, through drilling and measurement, including the following steps: b1. Clamp the experimental rod 701 on the machining tool and add a mark on end A of the experimental rod 701 to indicate the clamping direction 732 of end A; b2. Select the center 731 of end A as the entry point x1, and drill the drill bit from the entry point x1 of end A of the experimental rod 701 at the end, and drill out a hole 71 with a length equal to that of hole 2 72 as the experimental hole. b3. Use a measuring instrument to measure the orientation and thickness h of the thinnest part of the inner wall of the tool outlet port 76 of hole 71; b4. Determine the offset direction 77 of hole 71 by measuring the orientation of the thinnest point; Let the radius of the experimental rod 701 be r1 and the radius of hole 71 be r2, obtain the offset y of the center x of the hole 71 from the axis 75 of the rod, y = r1 - h - r2; Based on the axial position of the hole 71's exit port 76, and the offset direction and offset y of hole 71, obtain the specific position of the center x of the exit port.

[0056] Further measure one: like Figure 24 As shown, a scale view 7011 is made for the experimental rod 701. At least the entry point x1 and the center x of the exit port are reflected in the scale view 7011. A line segment 78 from x1 to x is drawn and extended to the B end face of the experimental rod 701. The intersection of the line segment with the B end face is the entry point x2 of the B end face.

[0057] Further measure two: like Figure 25 As shown, the tool entry point x2 is determined directly at the B end of the experimental rod 701B from the center 741 of the B end along the offset direction 77 determined by b4. The tool entry point x2 is located at a distance of 2y from the center 741 of the B end along the offset direction 77.

[0058] like Figure 26 As shown, the tool entry point x1 and tool entry point x2, as well as the clamping direction 732 at end A and the clamping direction 742 at end B, are marked on the cylindrical rod to be machined; or, they are directly input into the control system of the intelligent machine tool.

[0059] like Figure 27 , 28 As shown, the above-mentioned clamping direction 742 at end B is the direction after end B of rod 7 turns around and changes direction to the end where the drill bit is located, and then rotates 180° around the axis 75 of rod according to clamping direction 732 at end A.

[0060] In this way, clamp the rod 7 in the clamping direction of end A and drill hole 71 from the entry point x1, then turn around and clamp the rod 7 in the clamping direction of end B and drill hole 72 from the entry point x2, thus completing the machining of the complete metal tube hole 111 of the rod 7.

[0061] To eliminate gravitational interference, under permissible conditions, it is preferable to set the drill bit vertically and clamp the rod 7 vertically to carry out vertical drilling. Example 8

[0062] like Figure 30 , 31As shown, the difference from Embodiment 7 is that the tool entry point x1 and tool entry point x2 determined in Embodiment 7 are moved a distance y in the opposite direction of the offset direction, so that x is located on the rod axis 75 of the rod 7. In this way, it is possible to enter the tool from both sides of the rod axis 75. Compared with Embodiment 1, which only enters the tool from one side of the rod axis 75, the turning amount of the metal tube 11 can be reduced, and the diameter of the rod 7 can be reduced.

[0063] The above embodiments are only used to describe the present invention more clearly, and should not be regarded as limiting the scope of protection covered by the present invention. Any equivalent modifications should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. A torsion bar shaft, characterized in that: The device includes a metal tube (11) and a fiber layer (12) bonded with adhesive around the outer periphery of the metal tube (11). At both ends of the metal tube (11), there are several radially outward protruding hanging teeth (4). The hanging teeth (4) are used to hold the weft threads (1212) of the fiber strip (121) and to make the warp threads (1211) bear tensile stress by holding the weft threads (1212). The hanging teeth (4) are arranged in a circumferential multi-row and axial multi-column manner to ensure that the fiber strip (121) is wound at -45° to 45° with the axis of the torsion bar shaft (1) and then the two ends are respectively hung. The metal tube (11) has two hanging teeth (4) at both ends; the hanging teeth (4) are arranged in a two-row multi-column array, the two rows include a first basic row (41) and a second basic row (42), the hanging teeth (4) in the first basic row (41) correspond to the hanging teeth (4) in the second basic row (42) respectively, when the fiber strip (121) is wound at 0°, 45° and -45°, the same warp (1211) at one end of the torsion bar shaft (1) is subjected to the tensile stress provided by the two hanging teeth (4) located in the first basic row (41) and the second basic row (42) respectively.

2. The torsion bar shaft according to claim 1, characterized in that: A reinforcing row (43) is added between the first basic row (41) and the second basic row (42) so that when the fiber strip (121) is wound at 45° and -45°, the same warp (1211) at one end of the torsion bar shaft (1) is subjected to tensile stress provided by the three hooks (4) located in the first basic row (41), the reinforcing row (43) and the second basic row (42) respectively.

3. The torsion bar shaft according to claim 1 or 2, characterized in that: The hanging tooth (4) is arranged on the outer circumference of a toothed sleeve (3) that is fitted onto a metal tube (11), and the toothed sleeve (3) is fixedly fitted onto the metal tube.

4. The torsion bar shaft according to claim 3, characterized in that: The toothed sleeve (3) is a two-part bolt fastening structure, consisting of half sleeve one (31) and half sleeve two (32) and fastening bolt (33). The half sleeve one (31) and half sleeve two (32) are close to the support seat (8) and are fastening sections (34) for closing and fastening, and the other section is a toothed section (36) with hanging teeth (4).

5. The torsion bar shaft according to claim 4, characterized in that: The toothed section (36) near the fastening section (34) has an arc-shaped outer periphery that forms a wrapping surface (35) that resists the fiber layer (12) from shrinking towards the middle section of the torsion bar shaft (1) when it is under force. The other end has a transition section (37) that gradually shrinks towards the middle section of the torsion bar shaft (1).

6. A lightweight anti-roll torsion bar comprising the torsion bar shaft of claim 1 or 2, characterized in that: It also includes torsion arms at both ends of the torsion bar shaft (1), wherein the torsion arms are torsion arms (2) formed by extending and bending the metal tube (11) of the torsion bar shaft (1) to both ends.

7. The lightweight anti-roll torsion bar according to claim 6, characterized in that: It also includes an end connector (5) of the torsion arm (2), the end connector (5) including a swing arm connector (51) and a tie rod connector (52), the swing arm connector (51) being connected to the end of the torsion arm (2), and the tie rod connector (52) being connected to the tie rod (6).

8. The lightweight anti-roll torsion bar according to claim 7, characterized in that: The rotating arm connection (51) has a connection hole (511) that allows the end of the twisting arm (2) to enter.

9. The lightweight anti-roll torsion bar according to claim 8, characterized in that: The torsion arm (2) is connected to the end connector (5) by inserting the end of the torsion arm (2) into the connection hole (511) of the rotating arm connection part (51) through an interference fit; or, the inner wall of the connection hole (511) of the rotating arm connection part (51) is provided with an internal thread, the outer periphery of the end of the torsion arm is provided with an external thread, and the end of the torsion arm (2) is screwed into the connection hole (511) of the rotating arm connection part (51) through a thread fit to achieve the connection between the torsion arm (2) and the end connector (5).

10. The lightweight anti-roll torsion bar according to claim 8, characterized in that: The outer periphery of the end of the torsion arm (2) has an anti-detachment outer corrugation (512), and the inner wall of the connection hole (511) of the rotating arm connection part (51) has an anti-detachment inner corrugation formed by the deformation of the anti-detachment outer corrugation (512) during hot pressing and riveting. The torsion arm (2) and the connection hole (511) of the rotating arm connection part (51) are connected by hot pressing and riveting.

11. The lightweight anti-roll torsion bar according to claim 7, characterized in that: The rotating arm connecting part (51) is a connecting rod (513) that can be inserted into the end hole (21) of the torsion arm (2). The connecting rod (513) is inserted into the end hole (21) of the torsion arm (2) with an interference fit to realize the connection between the torsion arm (2) and the end connecting body (5).

12. The lightweight anti-roll torsion bar according to any one of claims 7-11, characterized in that: The pull rod connecting part (52) is a disc-shaped body with its axis parallel to the axis of the torsion bar shaft (1). The disc-shaped body is provided with a pin hole (527) for connecting with the pull rod (6) with its axis parallel to the axis of the torsion bar shaft (1).

13. The lightweight anti-roll torsion bar according to claim 8 or 9, characterized in that: The connecting part (52) of the pull rod is a ball joint component, which includes a ball joint (528) and an annular joint sleeve surrounding the outer circumference of the ball joint (528). The two sides of the ball joint (528) are exposed on both sides of the joint sleeve. The connecting hole (511) is provided on the ball joint (528) exposed on one side of the annular joint sleeve. The joint sleeve is connected to the pull rod (6).

14. The lightweight anti-roll torsion bar according to claim 13, characterized in that: The joint sleeve includes a semi-circular outer half sleeve one (521) and an outer half sleeve two (522), as well as an annular front inner half sleeve (523) and a rear inner half sleeve (524). The outer half sleeve one (521) has a left fixed foot one (5211) and a right fixed foot one extending radially outward on its left and right sides, respectively. The left fixed foot one (5211) and the right fixed foot one are respectively provided with a left screw hole one (52111) and a right screw hole one (52121). The outer half sleeve two (522) has a left fixed foot two (5221) and a right fixed foot two extending radially outward on its left and right sides, respectively. The left fixed foot two (5221) and the right fixed foot two are respectively provided with a left screw hole two (52211) and a right screw hole two (52221). 52221), the front inner half sleeve (523) and the rear inner half sleeve (524) are respectively fastened to the front and rear parts of the middle area of ​​the joint ball (528), the outer half sleeve one (521) and the outer half sleeve two (522) are fastened to the outside of the front inner half sleeve (523) and the rear inner half sleeve (524), the left fixing foot one (5211) is attached to the left fixing foot two (5221), the left screw hole one (52111) and the left screw hole two (52211) are connected to allow the screw (529) to pass through and be tightened, the right fixing foot one (5212) is attached to the right fixing foot two (5222), the right screw hole one (52121) and the right screw hole two (52221) are connected to allow the screw (529) to pass through and be tightened.

15. The lightweight anti-roll torsion bar according to claim 13, characterized in that: A semi-circular wear-resistant bushing one (525) and a wear-resistant bushing two (526) are provided between the joint sleeve and the joint ball (528).

16. A process for machining the bore of a lightweight anti-roll torsion bar metal tube as described in claim 6, characterized in that, Includes the following steps: S1. Perform cylindrical machining on the rod (7) to be machined, so that any cross-section is a circle and the center of the circle is located on the axis (75) of the rod. S2. By turning the clamping rod (7) around, use the same drill bit installed on one side of the machine tool to drill through the A and B ends of the rod (7) to drill through the connected holes 1 (71) and 2 (72), and make the axis line 1 (711) of hole 1 (71) and the axis line 2 (721) of hole 2 (72) on the same straight line. S3. Position and clamp the rod (7) with the first axis (711) and the second axis (721) as the axis (1111) of the pipe hole, and rotate the rod (7) around the axis (1111) of the pipe hole to machine the outer periphery of the rod (7) until the wall thickness at any point of the pipe hole (111) is the set standard wall thickness.

17. The bore machining process for the lightweight anti-roll torsion bar metal tube according to claim 16, characterized in that, To ensure that the centerline of hole one (711) and the centerline of hole two (721) are on the same straight line in S2, the following steps are included: a1. Predetermine the offset direction of the drill bit during actual drilling and the offset amount y of the center x of the drill bit's exit port (76) from the axis (75) of the rod; a2. Based on the offset direction obtained from a1, determine the clamping direction (732) of the A end and the clamping direction (742) of the rod (7) to be processed, and based on the offset amount y obtained from a1, determine the positions of the entry point x1 of the A end (73) and the entry point x2 of the B end (74) of the rod (7), ensuring that the axis line 1 (711) of the hole 1 (71) and the axis line 2 (721) drilled from the entry point x1 and the entry point x2 of the two ends of the rod (7) are parallel to each other, and ensure that the exit port (76) of the hole 1 (71) and the exit port (76) of the hole 2 (72) coincide and have a common center x. a3. Drilling, including the following steps: 1) Clamp the rod (7) according to the clamping direction (732) at end A as determined by a2, and drill from end A of the rod (7) at the entry point x1 determined by a2; 2) Turn around and change direction, clamp the rod (7) according to the clamping direction (742) of the B end determined by a2, and drill from the B end of the rod (7) according to the entry point x2 determined by a2.

18. The bore machining process for the lightweight anti-roll torsion bar metal tube according to claim 17, characterized in that, Obtaining the offset direction (77) of the drill bit described in a1 during actual drilling and the offset y of the center x of the drill bit's exit port (76) from the axis (75) of the rod is achieved by using a cylindrical rod (7) as the experimental rod (701) and obtaining the results through drilling and measurement, including the following steps: b1. Clamp the experimental rod (701) on the machine tool and add a mark (732) on end A of the experimental rod (701) to indicate the clamping direction (732) of end A; b2. Select the center of A end (731) as the entry point x1, and drill the drill bit from the entry point x1 of the A end face of the experimental rod (701) at the end of the drill bit, and drill out a hole (71) with a length equal to that of hole two (72) as the experimental hole. b3. Use a measuring instrument to measure the orientation and thickness h of the thinnest part of the inner wall of the tool outlet (76) of hole one (71); b4. Determine the offset direction (77) of hole one (71) by measuring the orientation of the thinnest point; set the radius of the experimental rod (701) as r1 and the radius of hole one as r2, and obtain the offset y of the center x of the hole one (71) from the axis (75) of the rod, y=r1-h-r2; based on the axial position of the hole one (71) outlet port (76), and the offset direction and offset y of hole one (71), obtain the specific position of the center x of the outlet port.

19. The bore machining process for the lightweight anti-roll torsion bar metal tube according to claim 18, characterized in that, Make a scale view (7011) of the experimental rod (701), at least the entry point x1 and the center of the exit port x are reflected in the scale view (7011). Draw a line segment (78) from x1 to x and extend the line segment to the B end face of the experimental rod (701). The intersection of the line segment with the B end face is the entry point x2 of the B end face.

20. The bore machining process for the lightweight anti-roll torsion bar metal tube according to claim 18, characterized in that, The tool entry point x2 is determined directly at the B end of the experimental rod (701) from the center (741) of the B end along the offset direction (77) determined by b4. The tool entry point x2 is located at a distance of 2y from the center (741) of the B end along the offset direction (77).

21. The bore machining process for the lightweight anti-roll torsion bar metal tube according to claim 19, characterized in that, Move the entry point x1 and entry point x2 by a distance y in the opposite direction of the offset direction so that x is located on the axis (75) of the rod (7).

22. The bore machining process for the lightweight anti-roll torsion bar metal tube according to any one of claims 19-21, characterized in that, Mark the tool entry point x1 and tool entry point x2, as well as the clamping direction at end A (732) and clamping direction at end B (742) on the cylindrical rod to be machined (7); or, directly input them into the control system of the intelligent machine tool.

23. The bore machining process for the lightweight anti-roll torsion bar metal tube according to claim 22, characterized in that, The clamping direction at end B (742) is the direction after the B end of the rod (7) turns around to the end where the drill bit is located, and then rotates 180° around the axis (75) of the rod according to the clamping direction at end A (732).

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