초록 ▼

A high-pressure fluid control solenoid valve assembly for use with a spill type fuel injection pump of an internal combustion engine, comprises an actuator portion (101) including a solenoid (8, 9), a stator (7) and an armature (14), and a valve portion (102) including a pilot valve (40, 41) and a m

A high-pressure fluid control solenoid valve assembly for use with a spill type fuel injection pump of an internal combustion engine, comprises an actuator portion (101) including a solenoid (8, 9), a stator (7) and an armature (14), and a valve portion (102) including a pilot valve (40, 41) and a main valve (42, 43) where the valve portion (102) is spaced apart from the actuator portion (101) and is responsive to the movement of the armature (14) via a rod (14) connected to the armature (14) and extends axially in a bore of the stator (7) which is cylindrical hollow. The pilot valve (40, 41) is coaxial with and telescopically received in the main valve (42, 43) so that two fluid chambers (54, 51) are formed inside and outside, respectively a spool (42) of the main valve such that the main valve is continuously kept closed irrespective of the fluid pressure in these chambers as long as the pilot valve is closed. The pilot valve comprises a needle (40) which is arranged to be pressed by the rod (13) to close the pilot valve on energization of the solenoid (8, 9), where the needle (40) is normally biased in valve-opening direction. On deenergization, the pilot valve opens causing the main valve to spill fuel thus terminating the fuel injection.

대표청구항 ▼

A high-pressure fluid control solenoid valve assembly for opening and closing a high pressure fluid passage, comprising: (a) an electromagnetic actuator portion having an armature, a winding, and a stator, which act as an electromagnetic solenoid and form a magnetic circuit; and (b) a valve portion

A high-pressure fluid control solenoid valve assembly for opening and closing a high pressure fluid passage, comprising: (a) an electromagnetic actuator portion having an armature, a winding, and a stator, which act as an electromagnetic solenoid and form a magnetic circuit; and (b) a valve portion which interrupts flow of fluid under high pressure, said valve portion being spaced apart from said electromagnetic actuator portion, said valve portion having a first valve functioning as a pilot valve of small flow rate and a second valve functioning as a main valve of large flow rate, said first valve being biased normally in opening direction by a first spring, said armature being operatively coupled to said first valve and being biased normally downwardly by a second spring so as to bias said first valve in a closing direction, said first and second springs having equal characteristics including at least spring constant, free length, spring wire diameter and number of turns, whereby said first valve is biased by the resultant force of said first and second springs, a biasing force in a first valve closing direction being obtained by changing the set lengths of said first and second springs, and said second valve being biased normally in closing direction by a third spring, a hydraulic chamber being provided where one wall is made by said second valve, said hydraluic chamber communicating via an orifice provided to said second valve with an upper stream portion from a seat portion of said second valve, said second valve being biased in closing direction by the hydraulic pressure of said hydraulic chamber; said solenoid valve assembly being formed such that the movement of said armature is transmitted to said first valve by way of a rod-like member fixed to said armature so as to perform unitary movement, said rod-like member being movable within a guide hole made at the center of said stator portion, said high pressure fluid passage being closed with said first valve being closed on energization of said winding and said high pressure fluid passage being opened with said first and second valves being opended on deenergization of the same.