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2, the fatigue life test torque test torque can be calculated according to formula (3) or (4), can also be determined according to design requirements.
a) The fatigue life test torque of the steering gear shaft assembly for automotive with rack and pinion steering gear is calculated according to formula (3).
M=Fr/ηp.................................(3)
Where: M - fatigue life test torque value, Nm;
F - rated output force of the steering gear, N;
Ηp - the average positive transmission efficiency of the steering gear, it is recommended to take 0.75;
r - the pitch circle radius of the gear, m;
b) Fatigue life test torque of other automobile steering shaft assembly is calculated according to formula (4).
M=M0/iωηp..............................(4)
Where: M - fatigue life test torque value, Nm;
M0—the rated output torque of the steering gear, Nm, and the rated output torque greater than 1700 Nm, calculated as 1700 Nm;
Iω - the angular gear ratio of the steering gear;
Ηp - the average positive transmission efficiency of the steering gear, it is recommended to take 0.70.
3. Check the damage of the sample after the test.
4, the measurement error is not more than 2%.
Specific details please consult Jinan Zhongchuang Industrial Test System Co., Ltd.
1. Fix the end of the assembly with the steering gear and apply positive and negative torque from one end of the steering wheel.