초록 ▼

A solenoid valve which includes a valve body having a central bore from which fluid passages radially extend. A valve spool is axially slidably captured within the valve body bore to control passage of fluid among the valve body passages. An electromagnetic variable force motor is mounted on the val

A solenoid valve which includes a valve body having a central bore from which fluid passages radially extend. A valve spool is axially slidably captured within the valve body bore to control passage of fluid among the valve body passages. An electromagnetic variable force motor is mounted on the valve body and includes a housing of ferromagnetic construction with a pole piece of ferromagnetic construction coaxial with the valve spool and surrounded by an electrical coil. An armature comprising a ball of ferromagnetic construction is positioned coaxially with the pole piece in abutting engagement with the valve spool. A coil spring is positioned to engage the ball-armature and to urge the same axially away from the pole piece. The characteristic of magnetic attraction between the ball-armature and the opposing face of the pole piece as a function of separation therebetween is substantially identical with spring rate, both preferably being a linear function of ball-armature displacement.

대표청구항 ▼

A solenoid valve comprising: a valve body having fluid passages extending therethrough and a valve element variably positionable within said valve body for controlling fluid flow through said passages, a housing of ferromagnetic construction mounted on said valve body and including a pole of ferroma

A solenoid valve comprising: a valve body having fluid passages extending therethrough and a valve element variably positionable within said valve body for controlling fluid flow through said passages, a housing of ferromagnetic construction mounted on said valve body and including a pole of ferromagnetic constuction having a central axis and electrical coil means surrounding said pole, an armature comprising a ball of ferromagnetic construction positioned coaxially with said pole, said ball-armature and said pole having a preselected characteristic of magnetic attractive force between said ball-armature and said pole as a function of separation between said ball-armature and said pole when current is applied to said coil means, means coupling said ball-armature to said valve element, and spring means positioned to engage said ball-armature and to urge said ball-armature axially away from said pole, said spring means having a spring rate substantially equal to said preselected characteristic.