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The article proposes a new technique for estimating the instantaneous supply in gear hydraulic machines. It takes into account the peculiarity of the movement of the radius connecting the centers of rotation of the gears with the point of engagement. The dependence of the angular velocity of rotation and the length of the radius on the position of the engagement point due to slipping of the working profiles of the gear teeth are determined. Estimation of the degree of non-uniformity of the supply, in accordance with the obtained model, differs significantly from the traditional ideas about the pulsation of the instantaneous supply in gear hydraulic machines.

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