# US 2016/0251007 A1 · Pump for integrated brake system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0251007 A1 - Document ID: US20160251007A1 - Status: Published application - Kind: A1 - Application number: 15/053,949 - Filed: 2016-02-25 - Published: 2016-09-01 - Earliest claimed: 2015-02-26 - Assignees: Mando Corporation - Applicants: Mando Corporation - Inventors: Weon Chan KO; Jin Seok KIM - Web page: https://patentgrep.com/patent/US20160251007A1 ## CPC - B60T 7/042: {by electrical means, e.g. using travel or force sensors} - B60T 1/10: by utilising wheel movement for accumulating energy, e.g. driving air compressors - B60T 13/745: {acting on a hydraulic system, e.g. a master cylinder} - B60T 17/02: Arrangements of pumps or compressors, or control devices therefor - F04B 9/02: the means being mechanical - F04B 17/03: driven by electric motors - F04B 35/01: the means being mechanical - F04B 53/146: {Piston-rod guiding arrangements} - 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 - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) ## Abstract Disclosed herein is a pump of an integrated brake system. The pump includes a motor, a gear unit which converts a rotating force of the motor into linear reciprocating movement, a piston assembly which is connected to the gear unit and reciprocates based on power conversion of the gear unit, a piston housing which accommodates the piston assembly, and a fixed rod fixedly disposed in the piston housing in a longitudinal direction. Here, the piston assembly includes a coupling groove formed therein, into which the fixed rod is inserted. ## Claims ### Claim 1 A pump of an integrated brake system, comprising: a motor; a gear unit which converts a rotating force of the motor into linear reciprocating movement; a piston assembly which is connected to the gear unit and reciprocates based on power conversion of the gear unit; a piston housing which accommodates the piston assembly; and a fixed rod fixedly disposed in the piston housing in a longitudinal direction, wherein the piston assembly comprises a coupling groove formed therein, into which the fixed rod is inserted. ### Claim 2 (depends on 1) The pump of claim 1, wherein the piston housing comprises a through hole formed in an end thereof to allow the fixed rod to be inserted thereinto and coupled therewith. ### Claim 3 (depends on 2) The pump of claim 2, further comprising a fixing member which is coupled with a portion of the fixed rod which passes through the through hole and is exposed to fix the fixed rod. ### Claim 4 (depends on 1) The pump of claim 1, wherein a cross section of the fixed rod is formed in a polygonal shape, and wherein the coupling groove is formed corresponding to the cross section of the fixed rod. ### Claim 5 (depends on 1) The pump of claim 1, wherein a hollow is formed in the motor, wherein the gear unit comprises a nut which is restricted by and coupled with a rotor of the motor and rotates based on rotation of the rotor, and wherein the piston assembly is disposed in the nut and reciprocates based on rotation of the nut. ### Claim 6 (depends on 5) The pump of claim 5, wherein the motor is coupled with one side of the piston housing and a through hole is formed in the other side thereof. ### Claim 7 (depends on 5) The pump of claim 5, further comprising: a motor housing which accommodates the motor; and a four-point contact bearing disposed between the motor housing and the rotor. ### Claim 8 (depends on 7) The pump of claim 7, wherein the motor housing and the piston housing are assembled based on a position of the four-point contact bearing. ### Claim 9 (depends on 5) The pump of claim 5, wherein the piston assembly comprises: a piston head which reciprocates in a cylinder formed in the piston housing; and a spindle which has one side inserted into and coupled with an insertion groove formed in one side of the piston head and is screw-coupled with the nut, and wherein a ring member is disposed on an outer circumferential surface of the spindle. ### Claim 10 (depends on 9) The pump of claim 9, wherein a holding protrusion is formed on an inner circumferential surface of the piston head, and wherein the spindle is inserted into the insertion groove until the ring member is held by the holding protrusion and then coak-coupled with one side of the piston head to fix the spindle to the piston head. ### Claim 11 (depends on 9) The pump of claim 9, wherein a holding groove is formed in an inner circumferential surface of the piston head, and wherein the spindle is inserted into the insertion groove until the ring member is held by the holding groove to fix the spindle to the piston head. ### Claim 12 (depends on 9) The pump of claim 9, wherein the piston assembly further comprises a rotation-preventing plate disposed in the insertion groove and formed corresponding to the fixed rod, and wherein the spindle comprises an accommodation groove formed in one side thereof, which accommodates the rotation-preventing plate. ### Claim 13 (depends on 1) The pump of claim 1, wherein the gear unit comprises: a worm shaft coaxially connected to a rotating shaft of the motor; a worm wheel which is engaged with the worm shaft and rotates based on rotation of the worm shaft; a pinion disposed coaxially with the worm wheel; and a rack bar which is engaged with the pinion and linearly reciprocates based on rotation of the pinion.