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# Phase Angle influence analysis of double universal joint axle shaft

Views: 2     Author: Site Editor     Publish Time: 2021-11-05      Origin: Site

## Study the transmission significance of double u joint half shaft

For cars with double universal joint cross shaft steering shaft installation space is limited, difficult to meet the constant speed driving conditions, need to adjust the phase. Angle to reduce the problem of the rotation speed fluctuation, adopt the method of space projection geometry, double universal joint cross shaft bearing model is established to the shaft speed ratio and Angle equations, and constant velocity condition verify its correctness.

The influence of phase Angle on speed ratio is quantitatively analyzed. The results show that when the two transmission angles are equal and the phase Angle is equal to the Angle between the transmission plane, the output shaft and the input shaft can achieve equal speed transmission. When the two transmission angles are not equal, the double cross shaft universal joint transmission shaft can not achieve equal speed transmission, but when the phase Angle is equal to the Angle between the transmission plane, the speed difference between the output shaft and the input shaft is minimum. Therefore, when the phase Angle of the transmission shaft is equal to and opposite to the Angle of the transmission surface, it is the best phase Angle. Then, the formula of the optimal phase Angle based on the hard point of the steering system is derived, and the calculation program is compiled, and the calculation result is verified by an example. The analysis results and the program have theoretical and practical significance for the design of automobile steering system and the transmission research of other kinds of universal joints.

The cross shaft universal joint can transfer torque at the same time of Angle change. It has simple structure, small wear, large transmission power, and large transmission Angle between the main and driven shafts.

## Double universal joint axle shaft to achieve constant speed transmission conditions：

In engineering, the double cross shaft universal joint must meet the following three conditions in order to achieve equal speed transmission  : ① The input shaft, the intermediate shaft and the output shaft should be in the same plane; (2) the forks of the two ends of the intermediate shaft are in the same plane; ③ The Angle between the input shaft and the intermediate shaft is equal to the Angle between the intermediate shaft and the output shaft. Due to the compact layout of automobile cockpit, the installation space of steering column and steering gear is restricted, and the steering drive shaft is difficult to meet the above three conditions of constant speed transmission. Literature [2-3] studies the functional relationship between input and output angular velocities of double universal joints on the basis of a single cross-axis universal joint. In reference [4-5], the speed ratio and Angle difference of Hooke universal joint at any Angle are calculated, and the conclusion that the unequal speed ratio is neither symmetrical nor balanced is drawn. Literature  established the motion equation of the double Hooke universal joint, and deduced the theoretical calculation formula of the relationship between the phase Angle of the flange fork at both ends of the middle shaft of the double Hooke universal joint and the transmission ratio. Adjusting the phase Angle of intermediate axis is an effective measure to reduce the influence of speed fluctuation, but there is no systematic study on the influence of phase Angle on system speed fluctuation and the conclusion of optimal phase Angle is given in the existing literature. How to choose the optimal phase Angle has become a key problem in the design of steering system. Therefore, the influence of the phase Angle of the steering transmission shaft with double cross joint on steering stability needs to be deeply analyzed.