STUDY OF THE POSSIBILITY OF USING GEAR PUMPS WITHOUT ADDITIONAL FRICTION DISCS FOR HYDROSTATIC LOCKING OF AUTOMOBILE DIFFERENTIALS

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Authors:  Ja. Mormylo

ABSTRACT. The purpose of this work is to study the possibility of using gear or gerotor pumps without additional friction discs for hydrostatic locking of automotive differentials on the example of a four-axes wheeled armored personnel carrier. This task is relevant for assessing the feasibility of developing and forming requirements for the characteristics of a differential with hydrostatic locking. To solve this problem, methods of the theory of automobile movement and computational methods of designing gear and gerotor pumps were used. The paper concluded that it is possible to implement a cross-wheel differential with hydrostatic locking without using additional friction discs based on a gear pump with internal gearing. Gerotor pumps with cycloidal toothing have been removed from consideration due to the difficulty of attaining high pressure in them due to the low overlap ratio of the tooth profiles. The considered differential has a quadratic dependence of the locking (braking) torque on the difference in the angular velocities of the half-axis and the differential housing. The necessary parameters of a gear pump for blocking the cross-wheel differential of an armored personnel carrier BTR-4 are determined. This allows, on the one hand, to obtain almost complete automatic locking of the differential during the slip, and, on the other hand, to provide minimal resistance to turning when maneuvering on hard-surface roads. The results will allow to abandon the technologically complex cam differential and significantly increase the service life and reliability of the drive axles for armored personnel carrier. In subsequent work, it is planned to numerically investigate the effect of the proposed differential with hydrostatic locking on the curvilinear movement of the armored personnel carrier on hard-surface roads.

Keywords:cross-wheel differential, locking effect, limited-slip differential, gear pump, hydrostatic locking.

DOI 10.2412/mmse.73.48.557

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