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US 5,040,569 AGranted
Direct-operated servo valve, fluid pressure servo mechanism and control method for the direct-operated servo valve
AssigneeHitachi, Ltd.
InventorsTadahiko Nogami, Ichiro Nakamura, Ichiro Maeno
Life of this patent
Estimating the term…
Abstract
A direct-operated servo valve which exhibits stable damping characteristics. The servo valve is characterized in that a viscous fluid is charged in the gap between a stator and a movable element. The velocity of a valve member is detected and a feed back the velocity signal is obtained by this detection so as to enable a damping of the motion of the valve member.
Claims7
A rotary servo valve comprising:
- a casing structure including a pair of opposed casing members;
- a valve member rotatably disposed between said pair of opposed casing members;
- a stator secured to said casing structure;
- a rotary shaft integrally connected to said valve member and arranged so as to be drivable by a drive command;
- a viscous fluid charged between said stator and said rotary shaft;
- and
- means for detecting an angular velocity of said valve member and feeding back said detected angular velocity to the rotary shaft so as to damp the motion of said valve member, and
- wherein said valve member includes a first hole means and a second hold means extending through said valve member in a direction of an axis of rotation thereof, one casing member includes a sleeve for forming a control orifice in cooperation with said first hole means and channels arranged to be separated from each other by said sleeve, and wherein a control port is connected to said sleeve, and a supply port and discharge port are connected to the respective channels.
5 more elements
A rotary servo mechanism comprising:
- a casing structure including a pair of opposed casing members;
- a valve member rotatably disposed between said pair of opposed casing members;
- a drive section including a stator secured to said casing structure and a rotary shaft integrally connected to said valve member;
- a control section for giving a drive command to said rotary shaft;
- a viscous fluid charged between said stator and said rotary shaft;
- and
- means for detecting an angular velocity of said valve member and feeding back said detected angular velocity to the rotary shaft so as to damp the motion of said valve member, and
- wherein said valve member includes a first hole means and a second hole means extending through said valve member in a direction of an axis of rotation thereof, one casing member includes a sleeve for forming a control orifice in cooperation with said first hole means and channels arranged to be separated from each other by said sleeve, and wherein a control port is connected to said sleeve, and a supply port and discharge port are connected to the respective channels.
5 more elements
Dependencies are inferred from the claim text.