# US 11,999,336 B2 · Stroke simulator and brake control apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,336 B2 - Document ID: US11999336B2 - Status: Granted - Kind: B2 - Application number: 17/274,375 - Filed: 2019-08-05 - Published: 2021-11-04 - Granted: 2024-06-04 - Earliest claimed: 2018-09-18 - Assignees: Hitachi Astemo, Ltd. - Applicants: Hitachi Astemo, Ltd. - Inventors: Ryohei Maruo; Takahiro Kawakami - Web page: https://patentgrep.com/patent/US11999336B2 ## CPC - B60T 8/409: {characterised by details of the stroke simulating device} - B60T 7/042: {by electrical means, e.g. using travel or force sensors} - B60T 13/142: {Systems with master cylinder} - B60T 13/662: {characterised by specified functions of the control system components} - B60T 13/686: {in hydraulic systems or parts thereof} - B60T 2270/82: Brake-by-Wire, EHB - 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 stroke simulator is configured in such a manner that an elastic member disposed in a cylinder of the stroke simulator is restricted from being deformed in a radial direction of the cylinder. ## Claims ### Claim 1 A stroke simulator configured to generate an operation reaction force of a brake pedal, the stroke simulator comprising: a cylinder; a piston contained in the cylinder movably in a direction of an axis of the cylinder; and an elastic member disposed in the cylinder so as to be compressed according to a movement of the piston and restricted from being deformed in a radial direction of the cylinder when the movement of the piston exceeds a predetermined stroke, wherein the elastic member has a hollow shape, wherein the piston includes a piston main body and a stem, and wherein the stem is inserted in an inner periphery of the elastic member, and wherein a groove is formed on the inner periphery of the elastic member. ### Claim 2 (depends on 1) The stroke simulator according to claim 1, wherein the elastic member is out of contact with an inner peripheral surface of the cylinder until the movement of the piston reaches the predetermined stroke, and is brought into contact with the inner peripheral surface of the cylinder when the movement of the piston exceeds the predetermined stroke. ### Claim 3 (depends on 2) The stroke simulator according to claim 2, wherein the cylinder includes a cylinder main body and a plug, and wherein the elastic member is held at a protrusion portion provided on a bottom surface of the plug. ### Claim 4 (depends on 1) The stroke simulator according to claim 1, wherein the piston includes the piston main body and the stem coupled with this piston main body. ### Claim 5 (depends on 4) The stroke simulator according to claim 4, wherein the stem is coupled with the piston main body by press-fitting or threaded engagement. ### Claim 6 (depends on 1) The stroke simulator according to claim 1, wherein the elastic member is formed symmetrically in the direction of the axis. ### Claim 7 A brake control apparatus comprising: a stroke simulator configured to generate an operation reaction force of a brake pedal, the stroke simulator including a cylinder, a piston contained in the cylinder movably in a direction of an axis of the cylinder, and an elastic member disposed in the cylinder so as to be compressed according to a movement of the piston and restricted from being deformed in a radial direction of the cylinder when the movement of the piston exceeds a predetermined stroke wherein the elastic member has a hollow shape, wherein the piston includes a piston main body and a stem, and wherein the stem is inserted in an inner periphery of the elastic member, and wherein a groove is formed on the inner periphery of the elastic member. ### Claim 8 (depends on 7) The brake control apparatus according to claim 7, further comprising a master cylinder connected to the stroke simulator, wherein the cylinder includes a first chamber and a second chamber separated by the piston, and wherein the first chamber is connected to the master cylinder, and the elastic member is disposed in the second chamber. ### Claim 9 (depends on 8) The brake control apparatus according to claim 8, wherein the second chamber is connected to a fluid passage connected to a braking force application portion configured to apply a braking force to a wheel. ### Claim 10 (depends on 7) The brake control apparatus according to claim 7, wherein the piston is coupled with an operation rod coupled with the brake pedal. ### Claim 11 A stroke simulator configured to generate an operation reaction force of a brake pedal, the stroke simulator comprising: a cylinder; a piston contained in the cylinder movably in a direction of an axis of the cylinder; and an elastic member disposed in the cylinder so as to be compressed according to a movement of the piston and restricted from being deformed in a radial direction of the cylinder when the movement of the piston exceeds a predetermined stroke, wherein the elastic member has a hollow shape, wherein the elastic member has a through-hole, wherein the piston includes a piston main body and a stem, and wherein a shaft member of the stem of the piston is inserted in the through-hole of the elastic member, and wherein inner peripheral surface of the through-hole of the elastic member is out of contact with an outer peripheral surface of the shaft member of the stem of the piston until the movement of the piston reaches the predetermined stroke, and is brought into contact with the outer peripheral surface of the shaft member of the stem of the piston when the movement of the piston exceeds the predetermined stroke. ### Claim 12 A stroke simulator configured to generate an operation reaction force of a brake pedal, the stroke simulator comprising: a cylinder; a piston contained in the cylinder movably in a direction of an axis of the cylinder; and an elastic member disposed in the cylinder so as to be compressed according to a movement of the piston and restricted from being deformed in a radial direction of the cylinder when the movement of the piston exceeds a predetermined stroke, wherein the elastic member has a hollow shape, wherein the piston includes a piston main body and a stem, wherein the stem is inserted in an inner periphery of the elastic member, and wherein a groove is formed on an outer periphery of the elastic member.