Pressure compensated solenoid valve with fluid flow force balancing
AssigneeSchaeffler Technologies AG & Co. KG
InventorsDavid Becker, Stefan Konias
Life of this patent
Estimating the term…
Abstract
A pressure compensated solenoid valve with fluid flow force balancing is provided. The solenoid valve includes an armature and a valve plunger arranged to transport hydraulic fluid from a supply end of a valve plunger to an upper end of the armature facilitating a resultant upper fluid force that acts upon the upper end of the armature to balance a resultant lower fluid force that acts on the supply end of the valve plunger. The solenoid valve includes a poppet that is configured as a pressure-relief valve for maintaining a minimum fluid pressure within an actuation fluid gallery. An inlet fluid force of the poppet is balanced by an outlet fluid force of the poppet.
Claims20
A solenoid valve comprising:
- a central axis;
- a bobbin configured to support a coil;
- the coil configured to produce a magnetic field when energized with electric current;
- a pole, at least a portion circumferentially surrounded by the bobbin;
- a containment tube, at least a portion circumferentially surrounded by the pole;
- an armature configured to be axially displaceable by the magnetic field, at least a portion of the armature circumferentially surrounded by the containment tube;
- a valve plunger, axially displaceable within a valve housing to a first seated position or a second non-seated position;
- a poppet arranged to be axially displaceable within the valve housing to a first closed position or a second pressure-relief position, the poppet biased to the first closed position by a poppet bias spring such that the poppet engages the valve plunger;
- and,
- the poppet arranged with a first surface at a first end and a second surface at a second end, the first and second surfaces configured to equalize, respectively, an inlet fluid force acting on the poppet with an exiting fluid force acting on the poppet, with the poppet in the second pressure-relief position.
A solenoid valve comprising:
- a central axis;
- a bobbin configured to support a coil;
- the coil configured to produce a magnetic field when energized with electric current;
- a pole, at least a portion circumferentially surrounded by the bobbin;
- a containment tube, at least a portion circumferentially surrounded by the pole;
- an armature configured to be axially displaceable by the magnetic field, at least a portion circumferentially surrounded by the containment tube;
- a valve plunger, axially displaceable within a valve housing to a first seated position or a second non-seated position;
- a poppet arranged to be axially displaceable within the valve housing to a first closed position or a second pressure-relief position, the poppet biased to the first closed position by a poppet bias spring;
- and,
- the poppet configured to be engaged at a first angled end by an inlet fluid producing an inlet fluid force, and at a second angled end by an exiting fluid producing an exiting fluid force, the poppet balanced by the inlet fluid force and the exiting fluid force in the second pressure-relief position.
Dependencies are inferred from the claim text.