EPS output shaft

A technology of output shaft and alloy steel, which is applied in the field of alloy steel materials, can solve problems such as wear and tear, and achieve the effects of improving comprehensive performance, suppressing brittleness, and improving oxidation resistance and corrosion resistance

Inactive Publication Date: 2018-05-01
NINGBO HONGBO MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The EPS output shaft, the main part of the current automobile steering system, is used after ordinary heat treatment (20Cr material), and the material of the EPS intermediate shaft of its matching part is also iron material. During use, it is found that the splines of the EPS output shaft and the inner splines of the EPS intermediate shaft, the main parts of the steering system of the car, are excessively worn, especially after long-term use, this wear phenomenon is more serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Press molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with layered graphite, flake graphite, paraffin, and zinc stearate; wherein, the alloy steel raw materials specifically include the following components by mass percentage: C: 0.24%, Si: 0.26%, Mn: 0.42%, Ni: 0.12%, Cr: 0.95%, Mo: 0.20%, B: 0.02%, the balance is Fe; the amount of layered graphite added is 1.2% of the quality of the alloy steel raw material, The amount of flake graphite added is 0.4% of the mass of the alloy steel raw material, the amount of paraffin wax added is 0.8% of the mass of the alloy steel raw material, the amount of zinc stearate added is 0.65% of the mass of the alloy steel raw material; the pressing pressure is 600MPa ;

[0032] Pre-firing and cooling: pre-fired for 305 minutes in a hydrogen atmosphere at 800°C, and water-cooled to obtain a pre-fired billet;

[0033] Recompression: Recompress the calcined billet at 700MPa;

[0034] Feeding rare e...

Embodiment 2

[0038] Press molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with layered graphite, flake graphite, paraffin, and zinc stearate; wherein, the alloy steel raw materials specifically include the following components by mass percentage: C: 0.25%, Si: 0.28%, Mn: 0.44%, Ni: 0.13%, Cr: 0.99%, Mo: 0.21%, B: 0.03%, the balance is Fe; the amount of layered graphite added is 1.23% of the quality of the alloy steel raw material, The addition of flake graphite is 0.41% of the mass of the alloy steel raw material, the addition of paraffin is 0.81% of the mass of the alloy steel raw material, the addition of zinc stearate is 0.66% of the mass of the alloy steel raw material; the pressure of pressing is 615MPa ;

[0039] Pre-firing and cooling: Pre-fired for 31 minutes in a hydrogen atmosphere at 807°C, and water-cooled to obtain a pre-fired billet;

[0040] Recompression: Recompress the calcined billet at 705MPa;

[0041] Feeding rare earth wires:...

Embodiment 3

[0045] Press molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with layered graphite, flake graphite, paraffin, and zinc stearate; wherein, the alloy steel raw materials specifically include the following components by mass percentage: C: 0.26%, Si: 0.29%, Mn: 0.46%, Ni: 0.15%, Cr: 1.05%, Mo: 0.23%, B: 0.035%, the balance is Fe; the amount of layered graphite added is 1.26% of the quality of the alloy steel raw material, The addition of flake graphite is 0.42% of the quality of the alloy steel raw material, the addition of paraffin is 0.83% of the quality of the alloy steel raw material, and the addition of zinc stearate is 0.68% of the quality of the alloy steel raw material; the pressure of pressing is 625MPa ;

[0046] Pre-firing and cooling: pre-fired at 813°C for 32 minutes in a hydrogen atmosphere, and water-cooled to obtain a pre-fired billet;

[0047] Recompression: Recompress the calcined billet at 710MPa;

[0048] Feeding rar...

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Abstract

The invention relates to an output shaft, in particular to an EPS output shaft, and belongs to the field of alloy steel materials. The EPS output shaft is made of alloy steel. The surface of the alloysteel is provided with a particle reinforced zinc layer in a cladding mode. The particle reinforced zinc layer specifically comprises the following components of, by mass, 3.6-4.2% of TaC, 2.5-3.4% of TiC, 1.8-2.5% of VC, 15.5-16.8% of Cr, 2.8-3.7% of B, 3.2-3.8% of Si, 10.8-12.4% of Fe, 2.5-3.2% of W, and the balance Zn. According to the EPS output shaft, by arranging the particle reinforced zinc layer on the surface of the alloy steel in the cladding mode, the zinc layer has high abrasion resistance, the anti-thermal shock and anti-oxidation capacities of the alloy steel are increased significantly, and the hot hardness of the alloy steel is improved.

Description

field of invention [0001] The invention relates to an output shaft, in particular to an EPS output shaft, and belongs to the field of alloy steel materials. Background technique [0002] With the rapid development of the domestic automobile industry, the requirement to improve the overall quality of automobiles has increasingly become the mainstream of the passenger car market. In this way, the steering system of passenger cars has also transitioned from the original hydraulic power assist to electric power assist, and the requirements for the fracture resistance of the input shaft, the main part of the electric power steering system (EPS), of automobiles are also getting higher and higher. At the same time, the research on its torsional strength performance It also unfolded accordingly. [0003] The EPS output shaft, the main part of the current automobile steering system, is used after ordinary heat treatment (20Cr material), and the material of the EPS intermediate shaft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/44C22C38/02C22C38/04B22F3/16B22F3/24C23C24/10
CPCC22C38/54B22F3/16B22F3/24B22F2998/10B22F2999/00C22C38/02C22C38/04C22C38/44C23C24/103B22F3/02B22F3/1007B22F3/14B22F2003/242B22F2201/013
Inventor 施红飞王巧洪若冰夏吉显侯卫兵
Owner NINGBO HONGBO MACHINERY MFG
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