Radial piston hydraulic motor and method in the control of a radial piston hydraulic motor
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United States of America Patent
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Jun 5, 2007
Grant Date -
Oct 7, 2004
app pub date -
Apr 1, 2004
filing date -
Apr 1, 2003
priority date (Note) -
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Abstract
The invention relates to a radial piston hydraulic motor (100) and to a method in the control of a radial piston hydraulic motor. The radial piston hydraulic motor (100) includes a free rotation valve (50) which is built inside it and includes a spindle (19). The spindle (19) is disposed in a spindle cavity (20) and it is movable in the spindle cavity (20) such that, in a free rotation situation, shoulders of the spindle (19) block the inlet and outlet passages of working pressure. In a free rotation situation, springs (U.sub.1, U.sub.2 . . . ) press pistons (13a.sub.1, 13a.sub.2 . . . ) and press rollers (14a.sub.1, 14a.sub.2 . . . ) associated therewith to a bottom position and out of contact with a cam ring (11).
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