Automobile steering wheel steering cable with high torsion frequency

Abstract

The utility model relates to the technical field of automobile cables, in particular to an automobile steering wheel steering cable with high torsion times. Comprising a conductor structure arranged at the axis of the whole cable, and the conductor structure is wrapped with an insulating structure; the conductor structure comprises a group of stranded wires arranged in the central layer, and six groups of same stranded wires are wound on the outer side of the group of stranded wires; each group of stranded wires is formed by stranding N first conductor monofilaments with the diameter of D, and M second conductor monofilaments with the diameter of d are bunched in each strand of stranded wires; wherein D is greater than d and M is greater than N; all the stranded wires are regularly stranded according to a 1 + 6 structure, the pitch diameter ratio is 12-15 times, and finally the conductor structure is formed; the insulation structure comprises an inner-layer wrapping insulation layer and an outer-layer extrusion insulation layer wrapping the first conductor monofilament on the outer side of the inner-layer wrapping insulation layer. According to the utility model, the durability and accuracy of the steering cable are greatly improved, and the controllability and safety of an automobile are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive cables, in particular to a steering cable for an automotive steering wheel with a high number of torsion cycles. Background Art

[0002] With the development of the automotive industry, the wiring harness system inside an automobile needs to withstand a higher number of torsion cycles and greater dynamic loads. Especially for the steering system of the steering wheel, its steering cable needs to have high durability and reliability to meet the requirements of modern automobiles for steering sensitivity and operating stability. Existing steering cables for steering wheels often have problems such as breakage or performance degradation after a certain number of torsion cycles. Therefore, a steering cable for a steering wheel that can withstand a high number of torsion cycles and has stable performance is needed. Summary of the Utility Model

[0003] In view of the defects existing in the prior art, the utility model provides a steering cable for an automotive steering wheel with a high number of torsion cycles. Its unique conductor structure, efficient insulating material and anti-torsion implementation greatly improve the durability and accuracy of the steering cable, ensure the controllability and safety of the automobile, and solve the problem of performance degradation of traditional steering cables caused by torsion fatigue during long-term use.

[0004] The utility model is implemented as follows:

[0005] A steering cable for an automotive steering wheel with a high number of torsion cycles includes a conductor structure provided at the center of the entire cable, and an insulating structure is wrapped around the outside of the conductor structure; characterized in that:

[0006] The conductor structure includes 1 group of stranded wires provided in the central layer, and 6 groups of the same stranded wires are wound around the outside of this group of stranded wires; each group of stranded wires is stranded by N first conductor single wires with a diameter of D, and inside each stranded wire, M second conductor single wires with a diameter of d are further bundled; where D > d and M > N;

[0007] All the stranded wires are regularly stranded in a 1 + 6 structure, and the pitch-diameter ratio is 12 - 15 times, finally forming the conductor structure;

[0008] The insulating structure includes an inner layer wrapping insulating layer and an outer layer extrusion insulating layer that wraps the first conductor single wire on the outside of the inner layer wrapping insulating layer.

[0009] Further, D = 2d.

[0010] Further, the number N of the first conductor single wires is 7.

[0011] Further, the number M of the second conductor single wires is 25.

[0012] Further, the diameter D of the first conductor single wire is 0.1 mm.

[0013] Further, the diameter d of the second conductor strand is 0.05 mm.

[0014] Further, the total cross-sectional area of the conductor structure is 1.2 mm 2 .

[0015] Further, the thickness of the inner layer wrapped insulation layer is 0.15 mm.

[0016] Further, the inner layer wrapped insulation layer is wound with a polytetrafluoroethylene film, and the overlapping rate is between 50% - 75%.

[0017] Furthermore, the thickness of the outer layer extruded insulation layer is 0.3 mm.

[0018] Advantages and technical effects of the present utility model:

[0019] 1) The present utility model utilizes the fine stranding technology. When the conductor is subjected to torsional action, the relative slip between layers can relieve local stress concentration, effectively delaying the occurrence of fatigue failure. The hierarchical stranding design of the conductor breaks the limitation of the traditional single conductor structure, greatly improving the energy dissipation capacity and anti-fatigue limit during torsion, ensuring good electrical conductivity and signal transmission performance even under extreme conditions.

[0020] 2) The selected double-layer insulation structure has a unique stress release mechanism. While resisting torsional deformation, it can also effectively inhibit the friction and wear between conductors, extending the service life of the cable. The new PTFE film not only has excellent chemical stability but also has low torsional deformation resistance. Coupled with the good viscoelasticity of the XLPO sheath, the two work together to ensure good electrical performance and mechanical strength of the cable during repeated torsion.

[0021] 3) After multiple simulations and actual measurements, the design of the steering cable of the present utility model can ensure at least more than 3 million continuous full-angle torsions under harsh working conditions, far exceeding the minimum requirements specified by the industry standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic diagram of the steering cable of the present utility model.

[0023] In the figure: 1 - conductor structure; 2 - inner layer wrapped insulation layer; 3 - outer layer extruded insulation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] As Figure 1 shown, the present utility model discloses a steering cable for an automotive steering wheel with a high number of torsion cycles, which includes a conductor structure 1 provided at the center of the entire cable, and two layers of insulation structures are wrapped outside the conductor structure.

[0026] The conductor structure includes a group of stranded wires provided in the central layer, and 6 groups of the same stranded wires are wound around the outside of this group of stranded wires; each group of stranded wires is formed by stranding N first conductor single wires with a diameter of D, and each strand of stranded wire is further formed by bunching M second conductor single wires with a diameter of d inside; among them, D > d and M > N;

[0027] Preferably, each group of stranded wires is formed by stranding 7 first conductor single wires with a diameter of 0.1 mm, namely silver-plated ultra-fine soft copper wires, and each strand of stranded wire is further formed by bunching 25 second conductor single wires with a diameter of 0.05 mm, namely silver-plated copper wires (all the second conductor single wires are bunched in a spiral shape in the same direction and with the same pitch); the 7 groups of stranded wires are stranded in total according to the 1 + 6 structure, and the pitch diameter ratio is 12 - 15 times, finally forming a high-flexibility conductor with a total cross-sectional area of 1.2 mm2. Such a hierarchical stranding structure is beneficial to dispersing the torsional stress, achieving better anti-fatigue performance, and the regular stranding wire structure is the most stable, which is beneficial to bending and twisting, the smallest stranding outer diameter, a round shape, and when cutting the stranded wire, the single wires will not bounce out and loosen the strands.

[0028] The insulation structure includes an inner layer wrapping insulation layer 2 and an outer layer extrusion insulation layer 3 wrapped outside the inner layer wrapping insulation layer 2.

[0029] The inner layer wrapping insulation layer 2 uses a modified polytetrafluoroethylene (PTFE) film, which has an ultra-low friction coefficient and excellent anti-torsion and anti-bending performance, with a thickness of 0.15 mm, and is wound using a high-speed precision wrapping machine, and the lapping rate is 50% - 75%, ensuring that the inner insulation layer is wound evenly and the lapping is stable, and it can withstand more than 10 million consecutive twisting actions without damage within the expected service life.

[0030] The outer layer extrusion insulation layer 3 is a cross-linked polyolefin thermoplastic elastomer (XLPO) sheath with high temperature resistance and wear resistance, with a thickness of 0.3 mm, and is extruded using a high-speed extruder, providing additional mechanical protection and electrical insulation effects for the entire cable.

[0031] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-torque steering cable for a steering wheel of an automobile, comprising a conductor structure arranged at the axis of the entire cable, and an insulating structure wrapped around the outer side of the conductor structure; characterized in that: The conductor structure comprises a group of twisted wires arranged in the center layer, and the group of twisted wires is surrounded by 6 groups of the same twisted wires; each group of twisted wires is formed by twisting N first conductor monofilaments with a diameter of D, and each twisted wire is further formed by bundling M second conductor monofilaments with a diameter of d; wherein D>d and M>N; All the stranded wires are twisted in a regular manner according to a 1+6 structure, with a pitch-diameter ratio of 12-15 times, to finally form the conductor structure; The insulating structure comprises an inner wrapped insulating layer and an outer extruded insulating layer which wraps the first conductor monofilament outside the inner wrapped insulating layer.

2. The high torsion number automobile steering wheel steering cable as claimed in claim 1, characterized in that: D=2d.

3. The high torsion number automobile steering wheel steering cable as claimed in claim 1, characterized in that: The number of the first conductor monofilaments is N=7.

4. The high torsion number automobile steering wheel steering cable as claimed in claim 3, characterized in that: The number M of the second conductor monofilaments is 25.

5. The high torsion number automobile steering wheel steering cable as claimed in claim 2, characterized in that: The diameter of the first conductor monofilament is D=0.1 mm.

6. The high torsion number automobile steering wheel steering cable as claimed in claim 5, characterized in that: The diameter of the second conductor monofilament is d=0.05 mm.

7. The high torsion number automobile steering wheel steering cable as claimed in claim 6, characterized in that: The total cross-sectional area of ​​the conductor structure is 1.2 mm 2 .

8. The high torsion number automobile steering wheel steering cable as claimed in claim 1, characterized in that: The thickness of the inner wrapped insulation layer is 0.15 mm.

9. The high torsion number automobile steering wheel steering cable as claimed in claim 8, characterized in that: The inner wrapped insulating layer is formed by winding a polytetrafluoroethylene film, and the overlapping rate is 50%-75%.

10. The high torsion number automobile steering wheel steering cable as claimed in claim 1, characterized in that: The thickness of the outer extruded insulating layer is 0.3 mm.

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