Mathematical model of full-drive traffic-vehicles during moving with blocked drive ransmission turning the shaft

Abstract

The article is devoted to the problem of twisting the transmission shaft of cars with a blocked drive front and rear (rear drive axles, is redistributed through the transmission of brake moments between the wheels in accordance with their normal load and the coefficient of adhesion to the road. parts, their wear and, as a consequence, additional loss of engine power and fuel consumption. In addition, in the movement of traction vehicles (TTS) on the curve the kinematic discrepancy of the linear trajectory is also due to the fact that its axes must pass different paths simultaneously, while being blocked, they tend to move at the same translational speeds.

An expression was obtained showing the nature of the oscillation development in the transmission of the all-wheel drive TTS. The solution of the obtained equation is found taking into account the initial and boundary conditions of the transmission and wheel parameters. The graph of the energy of rotational vibrations in the transmission of the car with the maximum possible difference of the radii of the wheels was obtained. The energy of oscillations at different laws of change of moment of resistance of movement of TTS is calculated.

It is proved that the change of the law of the moment of resistance of the movement does not affect the oscillations of the transmission. Calculations on the model showed that changing the radii of the wheels 30 times or more leads to noticeable oscillations in the transmission, which is not possible when operating the car. The obtained theoretical results related to the study of the dynamics of the transmission, allow to conclude that it is necessary to establish the factors that influence the additional fuel losses in the car during its operation in all-wheel drive mode.