Title:
ELECTRIC-HYDRAULIC CONVERTER
Document Type and Number:
Japanese Patent JPS5894602
Kind Code:
A
Abstract:
PURPOSE:To hold a concentric effect of a control piston and improve thereby the action of providing two annular grooves on the outer peripheral surface of the control piston so that the control piston comes into contact with opening lines of two injection ports which inject a fluid and spaced apart in the axial direction. CONSTITUTION:When an abrupt electric signal is sent to the control coil, only a pilot valve 5 moves downwardly instantaneously, and a balancing hole H is exposed and opened within a valve box. A lower injection port D assumes a state blocked by an annular wall 5b of the pilot valve 5. However, since an annular groove K is connected to the upper edge of the opening part of a lower injection port D, pressurized oil flows along the groove K between the annular side wall 5b of the pilot valve and the control valve 9, and acts uniformly on the inner periphery of the pilot valve. By this concentric effect, the inner peripheral surface of the pilot valve 5 holds a predetermined gap with the outer peripheral surface of the control piston.
Inventors:
OONO HIROO
Application Number:
JP19227881A
Publication Date:
June 04, 1983
Filing Date:
November 30, 1981
Export Citation:
Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
F15B9/09; F15B5/00; (IPC1-7): F15B5/00
Domestic Patent References:
| JPS4864397A | 1973-09-06 | |||
| JPS329723Y1 |
Attorney, Agent or Firm:
Kiyoshi Inomata
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