# US 8,540,212 B2 · Solenoid valve, armature for a solenoid valve, and method for producing an armature for a solenoid valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,212 B2 - Document ID: US8540212B2 - Status: Granted - Kind: B2 - Application number: 12/975,870 - Filed: 2010-12-22 - Published: 2011-06-23 - Granted: 2013-09-24 - Earliest claimed: 2009-12-23 - Assignees: Robert Bosch GmbH - Applicants: Harald Speer - Inventors: Harald Speer - Web page: https://patentgrep.com/patent/US8540212B2 ## CPC - F16K 31/0665: {with valve member being at least partially ball-shaped (F16K31/0662 takes precedence)} - B60T 8/363: {in hydraulic systems (B60T8/3655, B60T8/3675 and B60T8/369 take precedence)} - Y10T 29/49405: Valve or choke making - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to a solenoid valve, in particular for a brake system of a motor vehicle, having an axially displaceably supported armature, on one end of which a valve sealing body is disposed and with the other end of which a pole core is associated, and having a compression spring acting in prestressed fashion between the pole core and the armature. It is provided that the compression spring is held in prestressed fashion in an axial passage of the armature, between a bolt, having the valve sealing body and held in a selectable position in the axial passage in force- and/or form-locking fashion, and a thrust piece, disposed such that it can be pushed out of the axial passage up to a stop and subjects the pole core to the prestressing force. The invention further relates to an armature for a solenoid valve. Finally, the invention relates to a method for producing an armature for a solenoid valve. ## Claims ### Claim 1 A solenoid valve, in particular for a brake system of a motor vehicle, comprising: an axially displaceably supported armature, on one end of which a valve sealing body is disposed and with the other end of which a pole core is associated; and a compression spring acting in prestressed fashion between the pole core and the armature, wherein the compression spring is held in prestressed fashion in an axial passage of the armature, between a bolt, having the valve sealing body and being held in a selectable position in the axial passage in force- and/or form-locking fashion, and a thrust piece, disposed such that the thrust piece can be pushed out of the axial passage up to a stop, the thrust piece subjecting the pole core to a prestressing force of the compression spring wherein the bolt and/or the thrust piece each have at least one longitudinal slot on an outer jacket face thereof. ### Claim 2 (depends on 1) The solenoid valve as defined by claim 1, wherein the sealing body is embodied in one piece with the bolt. ### Claim 3 (depends on 1) The solenoid valve as defined by claim 1, wherein the armature has an axial receptacle, in which the compression spring rests in at least some regions, wherein the axial receptacle is embodied as the axial passage, and the compression spring is held in prestressed fashion in the axial passage between the bolt with its valve sealing body and being held in a selectable position and force- and/or form-locking fashion, and the thrust piece that can be pushed out from the axial passage up to a stop. ### Claim 4 (depends on 1) A method for producing an armature for a solenoid valve as defined by claim 1, having the steps of: introducing first the thrust piece and next the compression spring are into the axial passage, and then in conclusion introducing the bolt so far into the axial passage that the compression spring, tensed between the bolt and the thrust piece, attains a desired prestressing force; and ascertaining the prestressing force of the compression spring by subjecting the thrust piece to a defined contrary force. ### Claim 5 (depends on 4) The method as defined by claim 4, wherein the bolt is press-fitted, in particular iteratively, into the axial passage. ### Claim 6 A solenoid valve, in particular for a brake system of a motor vehicle, comprising: an axially displaceably supported armature, on one end of which a valve sealing body is disposed and with the other end of which a pole core is associated; and a compression spring acting in prestressed fashion between the pole core and the armature, wherein the compression spring is held in prestressed fashion in an axial passage of the armature, between a bolt, having the valve sealing body and being held in a selectable position in the axial passage in force- and/or form-locking fashion, and a thrust piece, disposed such that the thrust piece can be pushed out of the axial passage up to a stop, the thrust piece subjecting the pole core to a prestressing force of the compression spring. wherein the bolt is press-fitted into the axial passage and wherein the bolt and/or the thrust piece each have at least one longitudinal slot on an outer jacket face thereof. ### Claim 7 (depends on 6) The solenoid valve as defined by claim 6, wherein the thrust piece is embodied as T-shaped. ### Claim 8 (depends on 6) The solenoid valve as defined by claim 6, wherein the axial passage is embodied as tapered on its end associated with the pole core. ### Claim 9 A solenoid valve, in particular for a brake system of a motor vehicle, comprising: an axially displaceably supported armature, on one end of which a valve sealing body is disposed and with the other end of which a pole core is associated; and a compression spring acting in prestressed fashion between the pole core and the armature, wherein the compression spring is held in prestressed fashion in an axial passage of the armature, between a bolt, having the valve sealing body and being held in a selectable position in the axial passage in force- and/or form-locking fashion, and a thrust piece, disposed such that the thrust piece can be pushed out of the axial passage up to a stop, the thrust piece subjecting the pole core to a prestressing force of the compression spring, wherein the thrust piece is embodied as T-shaped and wherein the bolt and/or the thrust piece each have at least one longitudinal slot on an outer jacket face thereof. ### Claim 10 (depends on 9) The solenoid valve as defined by claim 9, wherein the axial passage is embodied as tapered on its end associated with the pole core. ### Claim 11 (depends on 9) The solenoid valve as defined by claim 9, wherein the compression spring is embodied as a helical spring. ### Claim 12 A solenoid valve, in particular for a brake system of a motor vehicle, comprising: an axially displaceably supported armature, on one end of which a valve sealing body is disposed and with the other end of which a pole core is associated; and a compression spring acting in prestressed fashion between the pole core and the armature, wherein the compression spring is held in prestressed fashion in an axial passage of the armature, between a bolt, having the valve sealing body and being held in a selectable position in the axial passage in force- and/or form-locking fashion, and a thrust piece, disposed such that the thrust piece can be pushed out of the axial passage up to a stop, the thrust piece subjecting the pole core to a prestressing force of the compression spring, wherein the axial passage is embodied as tapered on its end associated with the pole core and wherein the bolt and/or the thrust piece each have at least one longitudinal slot on an outer jacket face thereof. ### Claim 13 (depends on 12) The solenoid valve as defined by claim 12, wherein the compression spring is embodied as a helical spring. ### Claim 14 A The solenoid valve, in particular for a brake system of a motor vehicle, comprising: an axially displaceably supported armature, on one end of which a valve sealing body is disposed and with the other end of which a pole core is associated; and a compression spring acting in prestressed fashion between the pole core and the armature, wherein the compression spring is held in prestressed fashion in an axial passage of the armature, between a bolt, having the valve sealing body and being held in a selectable position in the axial passage in force- and/or form-locking fashion, and a thrust piece, disposed such that the thrust piece can be pushed out of the axial passage up to a stop, the thrust piece subjecting the pole core to a prestressing force of the compression spring, wherein the compression spring is embodied as a helical spring and wherein the bolt and/or the thrust piece each have at least one longitudinal slot on an outer jacket face thereof.