Valve for metering fluid

Patent metadata

Field	Value
Publication number	US-9677520-B2
Application number	US-201314398200-A
Country	US
Kind code	B2
Filing date	Mar 22, 2013
Priority date	May 4, 2012
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A valve for metering fluid is reported which has a valve housing having a valve opening and a valve seat, a valve needle, which is provided for the alternating closing and opening of the valve using a closing member cooperating with the valve seat, a resetting element that acts on the valve needle for closing the valve and an electromagnet that is able to have current applied to it, having a magnet armature that is drivable to a lift motion, which sits axially displaceably on the valve needle and carries along the valve needle in the lift direction for opening the valve via a driving flange situated on it. To simplify production and the assembly of the valve while achieving the advantages characteristic in valves having a prestroke spring and an armature free path, the magnet armature is supported on the valve housing using a diaphragm spring.

First claim

What is claimed is:

1. A valve for metering fluid, comprising:
a valve housing, on which a valve opening, enclosed by a valve seat is configured;
a valve needle, for alternating closing and opening of the valve, with a closing member that is settable upon the valve seat and lifted off from the valve seat;
a resetting element configured to act upon the valve needle for closing the valve;
an electromagnet to which current can be applied;
an axially displaceable magnet armature, the valve needle passing through the magnet armature, the magnet armature being drivable in a lift stroke motion and being configured to carry the valve needle via a driving flange in the lift stroke direction to open the valve, the driving flange being situated on the valve needle; and
a diaphragm spring supporting the magnet armature on the valve housing, the diaphragm spring having an outer spring washer and an inner spring washer, the outer spring washer and the inner spring washer being connected together via spring crosspieces, the outer spring washer being secured to the valve housing, and the inner spring washer supporting a lower side of the magnet armature, the valve needle passing through the outer spring washer and the inner spring washer;
wherein, the inner spring washer is fastened to the lower side of the magnet armature.

2. The valve of claim 1 , wherein an outer diameter of the inner spring washer is smaller than an outer diameter of the magnet armature and an inner diameter of the outer spring washer is smaller than the outer diameter of the magnet armature.

3. A valve for metering fluid, comprising:
a valve housing, on which a valve opening, enclosed by a valve seat, is configured;
a valve needle, for alternating closing and opening of the valve, with a closing member that is settable upon the valve seat and lifted off from the valve seat;
a resetting element configured to act upon the valve needle for closing the valve;
an electromagnet to which current can be applied;
an axially displaceable magnet armature, the valve needle passing through the magnet armature, the magnet armature being drivable in a lift stroke motion and being configured to carry the valve needle via a driving flange in the lift stroke direction to open the valve, the driving flange being situated on the valve needle; and
a diaphragm spring supporting the magnet armature on the valve housing, the diaphragm spring having an outer spring washer and an inner spring washer, the outer spring washer and the inner spring washer being connected together via spring crosspieces, the outer spring washer being secured to the valve housing, and the inner spring washer supporting a lower side of the magnet armature, the valve needle passing through the outer spring washer and the inner spring washer;
wherein a support of the diaphragm spring on the valve housing is configured so that when the valve is closed and no current is applied to the electromagnet the diaphragm spring that supports the magnet armature fixes the magnet armature in a neutral position, such that an axial distance that defines a prestroke gap is present between the magnet armature and the driving flange;
wherein the inner spring washer is fastened to the lower side of the magnet armature.

4. The valve of claim 3 , wherein in response to an axial deflection from the neutral position taking place in opposite directions, the diaphragm spring has different spring constants so that a spring constant at the deflection directed away from the valve seat is small, and, at a deflection directed towards the valve seat, is so large that swinging of the magnet armature through the neutral position is prevented.

5. The valve of claim 3 , wherein an outer diameter of the inner spring washer is smaller than an outer diameter of the magnet armature, and an inner diameter of the outer spring washer is smaller than the outer diameter of the magnet armature.

6. The valve of claim 3 , wherein in response to an axial deflection from the neutral position taking place in opposite directions, the diaphragm spring has different spring constants so that a spring constant at the deflection directed away from the valve seat is small, and, at a deflection directed towards the valve seat, is so large that swinging of the magnet armature through the neutral position is prevented.

Assignees

• Bosch Gmbh Robert

Inventors

• Buehner Martin
• Mayer Michael
• Knorpp Michael

Classifications

• F16K31/0665 Primary

  with valve member being at least partially ball-shaped (F16K31/0662 takes precedence) · CPC title

• F02M2200/26

  Fuel-injection apparatus with elastically deformable elements other than coil springs · CPC title

• F16F1/324

  characterised by having tongues or arms directed in a generally radial direction, i.e. diaphragm-type springs · CPC title

• F02M51/0685 Primary

  the armature and the valve being allowed to move relatively to each other or not being attached to each other · CPC title

• F02M2200/50

  Arrangements of springs for valves used in fuel injectors or fuel injection pumps · CPC title