Drive circuit for fluid motor
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United States of America Patent
Stats
-
Mar 2, 2004
Grant Date -
Oct 31, 2002
app pub date -
Mar 14, 2002
filing date -
Mar 15, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
When the load acting on a fluid motor (25) increases, a changeover valve (61) starts to be changed over toward a low-speed position L, but at this time an additional pilot fluid whose pressure is determined by the amount of fluid flowing into or out of a second passage (68) through first and second notches functions as a pressure regulator for a spool (65), and lowers the pressure within the second passage (68) without lowering the pressure within a high pressure-side main circuit (28), thereby tilting a swash plate (26) from a position of high-speed rotation to a position of low-speed rotation.
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