초록 ▼

A valve has a magnetic drive unit axially spaced from a valve section. An axially movable armature is moved by an electromagnet and an annular permanent magnet having radial magnetization. Reciprocation of the armature opens and closes a poppet valve to regulate fluid flow between two chambers. The

A valve has a magnetic drive unit axially spaced from a valve section. An axially movable armature is moved by an electromagnet and an annular permanent magnet having radial magnetization. Reciprocation of the armature opens and closes a poppet valve to regulate fluid flow between two chambers. The magnetic characteristics of the magnetic drive unit are such that the armature remains in either of two axial limit positions when current is not being applied to the electromagnetic coils. In order to compensate for fluid flow forces tending to close the poppet when open, a biasing spring is also used to help overcome these forces. In an embodiment applied to vehicle shock absorbers, an orifice plate and disc springs are used adjacent the poppet structure to permit damping characteristics which vary depending on whether the piston or the shock absorber is compressing or rebounding.

대표청구항 ▼

A pulse-width modulated valve for regulating fluid flow between first and second chambers, said valve comprising: (a) a generally cylindrical housing holding magnetic drive means connected to regulator means by connector means; (b) said magnetic drive means comprising: (1) a cylindrical ferromagneti

A pulse-width modulated valve for regulating fluid flow between first and second chambers, said valve comprising: (a) a generally cylindrical housing holding magnetic drive means connected to regulator means by connector means; (b) said magnetic drive means comprising: (1) a cylindrical ferromagnetic armature axially reciprocable between first and second positions; (2) magnetic motive means, generally surrounding said armature, comprising a radially magnetized permanent magnet and electromagnet means, said motive means designed to move said armature alternately between said first and second limit positions and to hold said armature at one of said limit positions in a preselected fashion; and (3) means for controlling said motive means; and (c) said regulator means comprising: (1) a generally cylindrical poppet, connected to said armature by said connector means, and axially reciprocable in a sleeve between a first open position when said armature is in said first limit position and a second closed position when said armature is in said second limit position; (2) wherein when said poppet is in said closed position, said poppet and said sleeve prevent fluid flow between said chambers, and when said poppet is in said open position, said poppet and said sleeve permit fluid flow between said chambers; and (3) means for biasing said poppet toward said open position.