# US 2017/0282882 A1 · Solenoid valve, vehicle brake hydraulic pressure control apparatus and solenoid valve fabrication method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0282882 A1 - Document ID: US20170282882A1 - Status: Published application - Kind: A1 - Application number: 15/471,195 - Filed: 2017-03-28 - Published: 2017-10-05 - Earliest claimed: 2016-03-30 - Assignees: Autoliv Nissin Brake Systems Japan Co., Ltd. - Applicants: Autoliv Nissin Brake Systems Japan Co., Ltd. - Inventors: Hirokazu TAKAHASHI; Hiroaki TOKOI - Web page: https://patentgrep.com/patent/US20170282882A1 ## CPC - B60T 15/00: Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00 (valve structures responsive to a speed condition B60T8/34; valves in general F16K) - B60T 8/3635: {switching between more than two connections, e.g. 3/2-valves (B60T8/364, B60T8/3645 and B60T8/365 take precedence)} - B60T 13/58: Combined or convertible systems - B60T 13/686: {in hydraulic systems or parts thereof} - F16K 11/044: with movable valve members positioned between valve seats - F16K 31/0627: {with movable valve member positioned between seats} - B60T 8/4081: {Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence)} - B60T 2270/402: Back-up - B60T 2270/404: Brake-by-wire or X-by-wire failsafe - B60T 2270/414: Power supply failure - 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 - 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)} ## Abstract One embodiment provides a solenoid valve. The solenoid valve includes a fixed core, a movable core and a coil. A first valve seat member and a second valve seat member are fixed in the fixed core, and a valve body member is disposed therebetween. A spring member is interposed between the valve body member and the second valve seat member such that the valve body member is normally seated on the first valve seat member. The valve body member can move away from the first valve seat member to be seated on the second valve seat member, by being pushed by the movable core. And, a guide member holds the valve body member and the spring member to the second valve seat member so as not to move away from the second valve seat member. ## Claims ### Claim 1 A solenoid valve comprising: a fixed core in which a flow path is formed; a movable core which is provided movably in relation to the fixed core; a coil configured to move the movable core by an electromagnetic force; a first valve seat member and a second valve seat member which are fixed in the fixed core; a valve body member which is disposed between the first valve seat member and the second valve seat member; and a spring member which is interposed between the valve body member and the second valve seat member, wherein the valve body member is seated on a valve seat surface of the first valve seat member by a biasing force of the spring member, wherein, as a result of the valve body member being pushed out by the movable core, the valve body member is caused to move away from the first valve seat member and to be seated on a valve seat surface of the second valve seat member, and wherein the valve body member and the spring member are held to the second valve seat member by a guide member which restricts the valve body member from moving away from the second valve seat member. ### Claim 2 (depends on 1) The solenoid valve of claim 1, wherein a guide surface on which the valve body member can slide is formed on the guide member. ### Claim 3 (depends on 1) The solenoid valve of claim 1, wherein the valve body member comprises: a spring bearing portion on which an end portion of the spring member is fitted; a sliding surface which can slide on the guide member; and an engagement portion which is brought into engagement with the guide member. ### Claim 4 (depends on 1) The solenoid valve of claim 1, wherein the valve body member comprises: a first valve portion which is seated on the valve seat surface of the first valve seat member; and a second valve portion which is seated on the valve seat surface of the second valve seat member, wherein an area where the first valve portion is brought into abutment with the valve seat surface of the first valve seat member is greater than an area where the second valve portion is brought into abutment with the valve seat surface of the second valve seat member. ### Claim 5 (depends on 4) The solenoid valve of claim 4, further comprising: a movable rod which moves in association with the movable core, wherein a flat surface is formed on the first valve portion, and wherein an end face of the movable rod is brought into abutment with the flat surface. ### Claim 6 (depends on 4) The solenoid valve of claim 4, wherein the valve body member comprises: a main body portion; the first valve portion which is formed at one end of the main body portion; and the second valve portion which is provided at the other end of the main body portion so as to project therefrom, and wherein a part of a spherical surface is formed at a distal end portion of the second valve portion. ### Claim 7 (depends on 1) The solenoid valve of claim 1, wherein the guide member has a cylindrical shape, wherein the spring member is accommodated in the guide member, and wherein a part of the flow path is formed between an inner circumferential surface of the fixed core and an outer circumferential surface of the guide member. ### Claim 8 (depends on 1) A vehicle brake hydraulic pressure control apparatus disposed between a master cylinder and a wheel cylinder, comprising: a slave cylinder configured to generate a brake hydraulic pressure by driving an electric actuator; and the solenoid valve of claim 1, wherein the solenoid valve switches between: a state where the valve body member is seated on the valve seat surface of the first valve seat member to thereby establish a communication between the master cylinder and the wheel cylinder; and a state where the valve body member is seated on the valve seat surface of the second valve seat member to thereby establish a communication between the slave cylinder and the wheel cylinder. ### Claim 9 (depends on 1) A fabrication method for the solenoid valve of claim 1, comprising: fixing the first valve seat member in the fixed core; and in such a state that the valve body member and the spring member are held to the second valve seat member by the guide member, fixing the second valve seat member in the fixed core and causing the valve body member to be seated on the valve seat surface of the first valve seat member. ### Claim 10 A solenoid valve comprising: a fixed core in which a flow path is formed; a movable core which is provided movably in relation to the fixed core; a coil configured to move the movable core by an electromagnetic force; a first valve seat member and a second valve seat member which are fixed in the fixed core; a valve body member which is disposed between the first valve seat member and the second valve seat member; and a spring member which is interposed between the valve body member and the second valve seat member, wherein the valve body member comprises: a main body portion; a first valve portion which is provided at one end face of the main body portion so as to project therefrom; and a second valve portion which is provided at the other end face of the main body portion so as to project therefrom, wherein the first valve portion is seated on a valve seat surface of the first valve seat member by a biasing force of the spring member, wherein, as a result of the valve body member being pushed out by the movable core, the first valve portion is caused to move away from the first valve seat member, and the second valve portion is then seated on a valve seat surface of the second valve seat member, and wherein a seal diameter of the first valve portion and a seal diameter of the second valve portion differ from each other. ### Claim 11 (depends on 10) The solenoid valve of claim 10, wherein a sliding surface which can slide on a guide surface formed in the fixed core is formed on an outer circumferential surface of the main body portion. ### Claim 12 (depends on 10) The solenoid valve of claim 10, wherein the valve body member and the spring member are held to the second valve seat member by a guide member. ### Claim 13 (depends on 11) The solenoid valve of claim 11, wherein a guide surface on which the sliding surface of the main body portion can slide is formed on the guide member. ### Claim 14 (depends on 12) The solenoid valve of claim 12, wherein the valve body member comprises: a spring bearing portion on which an end portion of the spring member is fitted; and an engagement portion which is brought into engagement with the guide member. ### Claim 15 (depends on 10) The solenoid valve of claim 10, further comprising: a movable rod which moves in association with the movable core, wherein a flat surface is formed on the first valve portion, and wherein an end face of the movable rod is brought into abutment with the flat surface. ### Claim 16 (depends on 10) A vehicle brake hydraulic pressure control apparatus which is disposed between a master cylinder and a wheel cylinder, comprising: a slave cylinder configured to generate a brake hydraulic pressure by driving an electric actuator; and the solenoid valve of claim 10, wherein the solenoid valve switches between: a state where the valve body member is seated on the valve seat surface of the first valve seat member to thereby establish a communication between the master cylinder and the wheel cylinder; and a state where the valve body member is seated on the valve seat surface of the second valve seat member to thereby establish a communication between the slave cylinder and the wheel cylinder. ### Claim 17 (depends on 16) The vehicle brake hydraulic pressure control apparatus of claim 16, wherein the seal diameter of the first valve portion is greater than the seal diameter of the second valve portion.