Bistable solenoid valve and method for assembling a bistable solenoid valve

Patent metadata

Field	Value
Publication number	US-11351973-B2
Application number	US-201816617313-A
Country	US
Kind code	B2
Filing date	Jun 11, 2018
Priority date	Jul 26, 2017
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

A bistable solenoid valve for a hydraulic brake system has a guide sleeve in which an upper immovable pole core is fixedly arranged and a closing element is displaceably arranged. The closing element is forced into a valve seat during a closing movement and lifts off from the valve seat during an opening movement, and is fixedly connected to a magnet assembly. An actuation of the movement of the closing element is performed by the magnet assembly via a coil positioned around and substantially surrounding the guide sleeve. A lower immovable pole core is fixedly arranged in the guide sleeve and the magnet assembly is positioned between the lower and the upper pole core.

First claim

The invention claimed is:

1. A bistable solenoid valve for a hydraulic brake system, comprising:
a guide sleeve;
an upper pole core fixedly arranged in the guide sleeve;
a valve seat;
a closing element movably arranged in the guide sleeve and configured to enter the valve seat during a closing movement and lift out of the valve seat during an opening movement;
a magnet assembly to which the closing element is fixedly connected, the magnet assembly comprising two permanent magnets separated from one another by an insulation that magnetically insulates the two permanent magnets from one another;
a coil positioned around the guide sleeve and substantially enclosing the guide sleeve, the coil configured to actuate movement of the closing element via the magnet assembly; and
a lower pole core fixedly arranged in the guide sleeve, the magnet assembly positioned between the lower pole core and the upper pole core,
wherein the bistable solenoid valve is configured such that:
energizing the coil in a first current direction magnetizes the upper pole core and the lower pole core in such a way that the upper pole core repels the magnet assembly and the lower pole core attracts the magnet assembly; and
energizing the coil in a second current direction magnetizes the upper pole core and the lower pole core in such a way that the lower pole core repels the magnet assembly and the upper pole core attracts the magnet assembly.

2. The bistable solenoid valve as claimed in claim 1 , wherein the magnet assembly is molded onto the closing element.

3. The bistable solenoid valve as claimed in claim 1 , wherein the magnet assembly has a first side facing the upper pole core and a second side facing the lower pole core, the first and second sides having magnetic poles with the same polarity.

4. The bistable solenoid valve as claimed in claim 1 , wherein the two permanent magnets are positioned oppositely relative to one another such that an upper side of a first one of the two permanent magnets and a lower side of a second one of the two permanent magnets have the same polarity.

5. The bistable solenoid valve as claimed in claim 1 , wherein the lower non-moving pole core is pressed into the guide sleeve.

6. The bistable solenoid valve as claimed in claim 1 , wherein at least one of the lower pole core and the upper pole core is positioned at least partially within the coil.

7. The bistable solenoid valve as claimed in claim 1 , wherein the closing element consists of non-magnetizable material.

8. A method for controlling a bistable solenoid valve that includes a guide sleeve; an upper pole core fixedly arranged in the guide sleeve; a valve seat; a closing element movably arranged in the guide sleeve and configured to enter the valve seat during a closing movement and lift out of the valve seat during an opening movement; a magnet assembly to which the closing element is fixedly connected, the magnet assembly including two permanent magnets separated from one another by an insulation that magnetically insulates the two permanent magnets from one another; a coil positioned around the guide sleeve and substantially enclosing the guide sleeve, the coil configured to actuate movement of the closing element via the magnet assembly; and a lower pole core fixedly arranged in the guide sleeve, the magnet assembly positioned between the lower pole core and the upper pole core, the method comprising:
energizing the coil in a first current direction to magnetize the upper pole core and the lower pole core in such a way that the upper pole core repels the magnet assembly and the lower pole core attracts the magnet assembly; and
energizing the coil in a second current direction to magnetize the upper pole core and the lower pole core in such a way that the lower pole core repels the magnet assembly and the upper pole core attracts the magnet assembly.

9. A method for assembling a bistable solenoid valve that includes a guide sleeve; an upper pole core fixedly arranged in the guide sleeve; a valve seat; a closing element movably arranged in the guide sleeve and configured to enter the valve seat during a closing movement and lift out of the valve seat during an opening movement; a magnet assembly to which the closing element is fixedly connected, the magnet assembly comprising two permanent magnets separated from one another by an insulation that magnetically insulates the two permanent magnets from one another; a coil positioned around the guide sleeve and substantially enclosing the guide sleeve, the coil configured to actuate movement of the closing element via the magnet assembly; and a lower pole core fixedly arranged in the guide sleeve, the magnet assembly positioned between the lower pole core and the upper pole core, the upper and lower pole cores and the magnet assembly are configured such that energizing the coil in a first current direction magnetizes the upper pole core and the lower pole core in such a way that the upper pole core repels the magnet assembly and the lower pole core attracts the magnet assembly, and energizing the coil in a second current direction magnetizes the upper pole core and the lower pole core in such a way that the lower pole core repels the magnet assembly and the upper pole core attracts the magnet assembly, the method comprising:
(i) connecting the upper pole core to the guide sleeve, (ii) positioning the closing element in the lower pole core, (iii) after positioning the closing element in the lower pole core, inserting the closing element, together with the lower pole core, into the guide sleeve that is connected to the upper pole core, (iv) after inserting the closing element, positioning the lower pole core, together with the closing element, in the guide sleeve, and (v) connecting the positioned lower pole core and the closing element to said guide sleeve; or
(i) connecting the upper pole core to the guide sleeve, (ii) positioning the closing element in the guide sleeve, (iii) inserting the lower pole core into the guide sleeve, (iv) positioning the inserted lower pole core in the guide sleeve, and (v) connecting the positioned lower pole core to said guide sleeve.

10. A hydraulic brake system for a motor vehicle, comprising at least one solenoid valve configured as the bistable solenoid valve as claimed in claim 1 , the at least one solenoid valve configured for controlling a brake fluid.

11. The bistable solenoid valve as claimed in claim 3 , wherein the first and second sides of the magnet assembly both have magnetic south pole or magnetic north pole polarity.

12. The bistable solenoid valve as claimed in claim 7 , wherein the closing element consists of non-magnetizable plastic.

13. The bistable solenoid valve as claimed in claim 1 , wherein the two permanent magnets include an upper permanent magnet and a lower permanent magnet, and the bistable solenoid valve is configured such that, when the coil is energized in the first current direction the upper pole core repels the upper permanent magnet and the lower pole core attracts the lower permanent magnet, and when the coil is energized in the second current direction the upper pole core attracts the upper permanent magnet and the lower pole core repels the lower permanent magnet.

14. The method as claimed in claim 8 , wherein, when the coil is energized in the first current direction the upper pole core repels an upper permanent magnet of the two permanent magnets and the lower pole core attracts a lower permanent magnet of the two permanent magnets, and when the coil is energized in the second current direction the upper pole core attracts the upper permanent magnet and the

Assignees

• Bosch Gmbh Robert

Inventors

• Ambrosi Massimiliano
• Kurz Edgar
• Stahr Wolf
• Schuller Wolfgang
• Landesfeind Klaus
• Eisenlauer Michael

Classifications

• B60T8/363 Primary

  in hydraulic systems (B60T8/3655, B60T8/3675 and B60T8/369 take precedence) · CPC title

• F16K31/0655

  Lift valves · CPC title

• H01F2007/1669

  Armatures actuated by current pulse, e.g. bistable actuators · CPC title

• H01F7/081

  Magnetic constructions · CPC title

• H01F7/1615

  Armatures or stationary parts of magnetic circuit having permanent magnet · CPC title