| 摘要 |
<p>The invention relates to a proportional hydraulic rotary pump with radial pistons, that can be tipped over, whose capacity may vary proportionally with the intensity of a control electric current, and which may reverse the direction of circulation of the working fluid while keeping the same rotation direction, being destined especially for closed-loop circuit hydraulic transmissions. According to the invention, the pump comprises a casing (1) provided with a rectangular pocket wherein there may slide transversally a runway (2) in which there run circularly, by means of some balls, an odd number of radial pistons (3), arranged in the same plane inside a rotor (4) coupled to a shaft (5) which, during the rotation may carry out three work situations: zero capacity when springs (6.1 and 6.2) fixed inside the pistons (7.1 and 7.2) keep the runway centered, proportional capacity depending on an external pressure controlled by a valve (8) arranged on a slide (9) and driven by an electromagnet (10) and having a certain direction of circulation of the working fluid, and a reverse capacity also proportional, by switching a distribution sleeve (11) pressed by an electromagnet (12), which may be brought back to the initial position by a spring (13) when the control pressure is directed through a lid (14) and through a plug (15) in order to reverse the direction of circulation of the fluid between the two holes of a supply lid (16) for the same direction of rotation of the pump.</p> |
