Title:
ELECTRIC HYDRAULIC VALVE
Document Type and Number:
Japanese Patent JP3174695
Kind Code:
B2
Abstract:
PURPOSE: To provide an electric hydraulic valve for hydraulic driving actuator control which is operable with a small capacity hydraulic power source and can ensure the control precision equal to a spool type valve.
CONSTITUTION: A poppet valve 2 for mutually connecting and disconnecting oil holes 11, 12 is pressed to a seat by a return spring 4. A balance piston 20 is provided between a rod 5 for transmitting the electromagnetic force of a force motor part 103 to open the poppet valve 2 and the poppet valve 2, and a balance chamber 21 situated on the poppet valve 2-side end of the balance piston 20 is connected to a tank drain. On the other hand, a hydraulic chamber 304 situated on the rod 5-side end of the balance piston 20 is connected to a hydraulic chamber 302 situated in the valve opening direction of the poppet valve 2 through a communicating passage 301. The piston area AN of the balance piston, the area A2 of the poppet valve 2, and the area A3 of the rod 5 are set to have the relation of A1= A2+A3, so that no hydraulic force is loaded to the force motor 103, and the poppet valve 2 can be thus precisely controlled by the electromagnetic force of the force motor.
Inventors:
Tadashi Kusunose
Etsuo Kunimoto
Arai Tokuyasu
Tamiya Shirakihara
Etsuo Kunimoto
Arai Tokuyasu
Tamiya Shirakihara
Application Number:
JP23299594A
Publication Date:
June 11, 2001
Filing Date:
September 28, 1994
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
F15B13/044; F16K31/06; (IPC1-7): F16K31/06; F15B13/044
Domestic Patent References:
| JP6173907A |
Attorney, Agent or Firm:
Arata Ishikawa