# US 2017/0282879 A1 · Hydraulic pressure generation apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0282879 A1 - Document ID: US20170282879A1 - Status: Published application - Kind: A1 - Application number: 15/471,188 - 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: Yoshiteru MATSUNAGA - Web page: https://patentgrep.com/patent/US20170282879A1 ## CPC - B60T 13/745: {acting on a hydraulic system, e.g. a master cylinder} - B60T 8/368: {combined with other mechanical components, e.g. pump units, master cylinders} - B60T 8/4081: {Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence)} - B60T 11/165: {Single master cylinders for pressurised systems} - B60T 11/22: characterised by being integral with reservoir - B60T 15/36: Other control devices or valves characterised by definite functions {(electrically controlled valves in fluid-pressure brake systems B60T15/027, B60T15/028)} - 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 ## Abstract One embodiment provides a hydraulic pressure generation apparatus including: a base body; a motor; a reservoir tank; a master cylinder which generates a brake hydraulic pressure by a brake manipulator; and a slave cylinder which generates a brake hydraulic pressure the motor. The base body includes: a first cylinder hole which is a bottomed cylinder hole, and in which the first piston is inserted; a second cylinder hole which is a bottomed cylinder hole, and in which the second piston is inserted; and a supply passage which leads from the reservoir tank to a hydraulic chamber of the slave cylinder. The supply passage is provided with a check valve which permits only inflow of brake fluid from the reservoir tank to a side of the slave cylinder, near a brake fluid discharge port of the second cylinder hole. ## Claims ### Claim 1 A hydraulic pressure generation apparatus including: a base body; a motor attached to the base body; a reservoir tank which is attached to the base body and stores a brake fluid; a master cylinder which generates a brake hydraulic pressure by a first piston which is linked to a brake manipulator; and a slave cylinder which generates a brake hydraulic pressure by a second piston by the motor as a drive source, wherein the base body includes: a first cylinder hole which is a bottomed cylinder hole, and in which the first piston is inserted; a second cylinder hole which is a bottomed cylinder hole, and in which the second piston is inserted; and a supply passage which leads from the reservoir tank to a hydraulic chamber of the slave cylinder, wherein the supply passage is provided with a check valve which permits only inflow of brake fluid from the reservoir tank to a side of the slave cylinder, and wherein the check valve is disposed near a brake fluid discharge port of the second cylinder hole. ### Claim 2 (depends on 1) The hydraulic pressure generation apparatus of claim 1, wherein a portion of the slave cylinder near a bottom surface of the second cylinder hole projects outward in a direction of an axial line of the second cylinder hole with respect to other portions of the base body. ### Claim 3 (depends on 1) The hydraulic pressure generation apparatus of claim 1, wherein an axial line of the check valve is parallel with an axial line of the second cylinder hole. ### Claim 4 (depends on 3) The hydraulic pressure generation apparatus of claim 3, wherein the check valve is disposed on the master cylinder side of the slave cylinder. ### Claim 5 (depends on 3) The hydraulic pressure generation apparatus of claim 3, wherein the check valve is disposed on the motor side of the slave cylinder. ### Claim 6 (depends on 3) The hydraulic pressure generation apparatus of claim 3, wherein an axial line of the first cylinder hole, the axial line of the second cylinder hole, and an axial line of an output shaft of the motor are parallel with each other, and wherein, when viewed in the axial line of the second cylinder hole, the axial line of the check valve is located inside a triangle that connects the axial line of the first cylinder hole, the axial line of the second cylinder hole, and the axial line of the output shaft. ### Claim 7 (depends on 3) The hydraulic pressure generation apparatus of claim 3, wherein the axial line of the check valve is located above the axial line of the second cylinder hole. ### Claim 8 (depends on 3) The hydraulic pressure generation apparatus of claim 3, wherein a hydraulic passage as a portion of the supply passage which extends from the check valve toward the reservoir tank is parallel with the axial line of the second cylinder hole. ### Claim 9 (depends on 1) The hydraulic pressure generation apparatus of claim 1, wherein an axial line of the check valve coincides with an axial line of the second cylinder hole.