HYDRAULIC POSITIVE DISPLACEMENT PUMP PROVIDED WITH CAMS HAVING OSCILLATING FOLLOWERS CONTROLLED BY CONTROL OF CONTROL FLUID

摘要

The invention relates to a hydraulic positive displacement pump activated by cams which impose on a plurality of followers a movement such that they oscillate about their axis with angular rather than rectilinear momentum. Controlling the control fluid volume enables the geometric volume of this type of pump to be controlled. The pump is characterized in that: the axes help to support some of the force resulting from the effect of the control pressure on the followers during the withdrawal cycle, instead of being supported solely by the regions in which the cams and followers are in contact; the exchange of force in the contact regions increases gradually: it is low when they are first in contact and increases as the withdrawal cycle advances. The axes of the oscillating followers form a movement guide which is far better than that of the rectilinear momentum in terms of ease of production and performance. The invention concerns a novel method enabling mutual stresses in the area of contact between a cam and a follower to be reduced and consists in a groove being produced in the cam, the effect of which is to increase flexibility in the peripheral region, enlarge the area of contact, and hence increase the force-distribution surface. This method may be used in any similar technical application.