# US 10,246,068 B2 · Pressure modulator for an ABS system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,246,068 B2 - Document ID: US10246068B2 - Status: Granted - Kind: B2 - Application number: 15/643,570 - Filed: 2017-07-07 - Published: 2018-01-11 - Granted: 2019-04-02 - Earliest claimed: 2016-07-07 - Assignees: Brake Force One GmbH - Applicants: Brake Force One GmbH - Inventors: Jakob Lauhoff - Web page: https://patentgrep.com/patent/US10246068B2 ## CPC - B60T 8/4266: {having an electro-mechanically actuated expansion unit, e.g. solenoid, electric motor, piezo stack} - B60T 8/42: having expanding chambers for controlling pressure {, i.e. closed systems} - B60T 8/4208: {Debooster systems} - 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 A pressure modulator for an ABS system includes a housing that which has a hydraulic inlet and a hydraulic outlet that are interconnected via a hydraulic line; a volume accumulator that increases a volume of the hydraulic line during an activated anti-lock function, a linear drive for opening the volume accumulator and an electronic circuit that controls the linear drive and is disposed in the housing. ## Claims ### Claim 1 A pressure modulator for an antilock braking system (ABS), comprising: a housing having a hydraulic inlet and a hydraulic outlet that are interconnected via a hydraulic line; a volume accumulator for increasing a volume of the hydraulic line during an activated anti-lock function; a linear drive for opening the volume accumulator; an electronic circuit disposed in the housing for controlling the linear drive; a spring element, wherein the linear drive comprises a rotor bar and wherein a displacement movement of the rotor bar effectuates an opening of the volume accumulator against a spring force of the spring element; and a control piston that extends into the rotor bar, the control piston being fixedly connected to the housing and supporting the spring element. ### Claim 2 (depends on 1) The pressure modulator according to claim 1, further comprising a pressure sensor disposed in the housing for detecting a pressure in the volume accumulator. ### Claim 3 (depends on 1) The pressure modulator according to claim 1, wherein the electronic circuit comprises one or more of the following: an acceleration sensor, a microprocessor and a power output stage. ### Claim 4 (depends on 2) The pressure modulator according to claim 2, wherein the pressure sensor is disposed on a printed circuit board comprising the electronic circuit. ### Claim 5 (depends on 1) The pressure modulator according to claim 1, wherein the housing includes a chamber and wherein the electronic circuit is disposed axially next to the volume accumulator in the chamber of the housing. ### Claim 6 (depends on 1) The pressure modulator according to claim 1, wherein the hydraulic line is routed through the electronic circuit. ### Claim 7 (depends on 1) The pressure modulator according to claim 1, wherein the spring element is supported at least indirectly on the housing and the rotor bar, and wherein the spring element is disposed in the rotor bar. ### Claim 8 (depends on 1) The pressure modulator according to claim 1, further comprising precisely one dynamic seal that acts between the rotor bar and the control piston. ### Claim 9 (depends on 1) The pressure modulator according to claim 1, wherein the control piston is designed as a hollow body. ### Claim 10 (depends on 1) The pressure modulator according to claim 1, wherein the rotor bar is disposed in the hydraulic line in such a way that a hydraulic medium can flow around the rotor bar. ### Claim 11 (depends on 1) The pressure modulator according to claim 1, wherein the rotor bar comprises at least one hydraulic fluid recess. ### Claim 12 (depends on 11) The pressure modulator according to claim 11, wherein the at least one hydraulic fluid recess is arranged on a lateral face of the rotor bar and comprises at least one groove extending helically or in the longitudinal direction of the rotor bar. ### Claim 13 (depends on 1) The pressure modulator according to claim 1, further comprising a valve arrangement that is actuated by the rotor bar and provided in the hydraulic line. ### Claim 14 A hydraulic brake system having an anti-lock function, comprising: a master cylinder that generates a hydraulic pressure and is connected to a wheel brake in a hydraulically communicating way via a hydraulic line; and a pressure modulator for an antilock braking system (ABS), wherein the pressure modulator comprises: a housing having a hydraulic inlet and a hydraulic outlet that are interconnected via the hydraulic line; a volume accumulator for increasing a volume of the hydraulic line during an activated anti-lock function; a linear drive for opening the volume accumulator; an electronic circuit disposed in the housing for controlling the linear drive; a spring element, wherein the linear drive comprises a rotor bar and wherein a displacement movement of the rotor bar effectuates an opening of the volume accumulator against a spring force of the spring element; and a control piston that extends into the rotor bar, the control piston being fixedly connected to the housing and supporting the spring element.