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A force-limiting torsion bar related to automobile seat belts

A safety belt and force-limiting technology, which is applied in the field of force-limiting torsion bars, can solve the problems of reduced mold life, increased cost of force-limiting torsion bar parts, and high material hardness, and achieves excellent efficiency, stable torque values, and force-limiting Even value effect

Inactive Publication Date: 2016-04-06
上海冠驰汽车安全技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the material composition of the force-limiting torsion bar is improper, it will cause the static torque of the force-limiting torsion bar to fail to meet the requirements, or the dynamic limit value exceeds the specified range, or the hardness value of the material is too high or too low, resulting in the disadvantages such as a significant decrease in the life of the molding die. Leads to higher cost of force limiting torsion bar parts
[0005] However, currently, no relevant reports and patents have been found for the materials and related components of the force-limiting torsion bar for manufacturing automobile seat belts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The chemical composition of the force-limiting torsion bar material is as follows: Carbon C: 0.01-0.08wt%; Silicon Si: 0.03wt%; Manganese Mn: 0.20wt%; Aluminum Alwt%: 0.35; Phosphorus P: 0.008wt%; Sulfur S: 0.006wt% %; Copper Cu: 0.18wt%; Titanium Ti: 0.05wt%; Niobium Nb: 0.01wt%, the remainder being iron Fe. Using the above-mentioned materials to prepare a force-limiting torsion bar with a diameter of 7.98mm and a required limit force value of 3KN, after three dynamic tests, the force-limiting values ​​of the force-limiting torsion bar are 2.96, 2.88 and 2.92KN respectively, which are in line with the requirements of the force-limiting torsion bar Limit force requirements.

Embodiment 2

[0014] The chemical composition of the force-limiting torsion bar material is as follows: carbon C: 0.01-0.09wt%; silicon Si: 0.08wt%; manganese Mn: 0.25wt%; aluminum Al: 0.40wt%; phosphorus: 0.007wt%; sulfur S: 0.005wt% %; copper Cu: 0.20wt%; titanium Ti: 0.04wt%; The above-mentioned material is used to manufacture a force-limiting torsion bar with a diameter of 7.99mm and a required force-limiting value of 3KN. After three dynamic tests, the force-limiting values ​​of the force-limiting torsion bar are 2.93, 2.85 and 2.99KN respectively, which are in line with the requirements of the force-limiting torsion bar. Limit force requirements.

[0015] The material of the force-limiting torsion bar in the present invention belongs to the mild steel material, and Si and Al in the alloy elements in the steel are both beneficial elements, which can reduce the austenite phase zone and improve the strength of the ferrite; Al also has a refined steel the essential grains.

[0016] In a...

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Abstract

The invention relates to the technical field of manufacture of automobile parts, and particularly relates to a force-limiting torsion bar in relation to an automobile safety belt. The force-limiting torsion bar is characterized by comprising the following chemical components in percentage by weight: 0.01-0.10wt% of C, 0.02-0.04wt% of Si, 0.15-0.25wt% of Mn, 0.25-0.50wt% of Al, 0.005-0.015wt% of P, 0.005-0.015wt% of S, 0.15-0.20wt% of Cu, 0.04-0.06wt% of Ti, 0.01-0.03wt% of Nb and the balance of Fe. Compared with the prior art, the force-limiting torsion bar has the advantages that after the material is adopted, the process step of the annealing treatment in the conventional cold-forging forming process can be omitted, and a mold with higher cost and special treatment is not needed; the torque value is more stable; and the force limiting value is uniform.

Description

technical field [0001] The invention relates to the technical field of manufacturing automobile parts, in particular to a force-limiting torsion bar related to automobile safety belts. Background technique [0002] The force-limiting torsion bar of the automobile safety belt is an important part of the new automobile safety belt. When the car is running at high speed or braking in an emergency, it will generate huge inertial force. The restraint effect of the seat belt will greatly squeeze the driver and passengers, which may cause body surface bruises, internal organs or bone injuries. Therefore, some additional safety protection measures are required, among which the force-limiting torsion bar TorsionBar is used. LoadLimiter or Forcelimiter is one of the methods. [0003] Autoliv, Tianhe, Takata and other companies have conducted studies on the use of seat belt torsion bars, showing that the use of seat belt torsion bars can reduce the degree of head injury by half. Wan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R22/00C22C38/16
Inventor 印炯周细应毛秀娟
Owner 上海冠驰汽车安全技术有限公司
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