WO2014177698A1 - Elektrohydraulische servobremse - Google Patents
Elektrohydraulische servobremse Download PDFInfo
- Publication number
- WO2014177698A1 WO2014177698A1 PCT/EP2014/058995 EP2014058995W WO2014177698A1 WO 2014177698 A1 WO2014177698 A1 WO 2014177698A1 EP 2014058995 W EP2014058995 W EP 2014058995W WO 2014177698 A1 WO2014177698 A1 WO 2014177698A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- push rod
- auxiliary piston
- central
- auxiliary
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
Definitions
- the present invention relates to an electro-hydraulic power brake, a
- Such an electro-hydraulic servo brake is known in the general state of the art. In such a servo brake, however, sends the modulation during the actuation of the ABS system, a certain amount of brake fluid in the master cylinder. This manifests itself in a retraction of the brake pedal, combined with weak pressure peaks in the master cylinder. These pressure variations are on the order of ⁇ 30 bar.
- the servo brake with electric motor is a rigid transmission system that does not spontaneously recede under the effect of such stresses. This results in an increase in the amplitude of the pressure peaks during this maneuver. This increase can exceed 100 bar, allowing the transmission of the servo brake experiencing great fatigue at the expense of its reliability.
- the object of the present invention is to develop an electrohydraulic power brake, the pressure peaks of which are generated during the application of the ABS system being reduced in order to reduce the forces exerted on the transmission of the power brake.
- the present invention has a servo brake of the type defined above, characterized in that the end of the push rod is connected to the auxiliary piston by a connection comprising:
- auxiliary piston which surrounds the central piston by being applied against the reaction disc, pushed by the tared spring and held in the end position by the central piston, the auxiliary piston being able to recede with respect to the central piston fixedly connected to the push rod.
- the thrust of the tared spring corresponds to a pressure in the master cylinder.
- this pressure is set to 130 bar, so that under this pressure in the master cylinder, the servo brake operates normally:
- the auxiliary piston pushes the push rod by means of the reaction disc, without the reaction disc itself deformed against the central piston and the auxiliary piston, which are carried by the end of the push rod.
- the auxiliary piston yields to the thrust of the compression spring so that the reaction exerted on the auxiliary piston by the master brake cylinder and its transmission ratio (rack, Sprocket, etc.) is reduced while the thrust transmitted from the central piston to the plunger and to the push rod and then to the brake pedal is increased.
- This change in the distribution of the load applied to the servo brake in response to the master cylinder improves the operation of the servo brake and reduces the stress associated with the pressure spikes and, consequently, the fatigue of the transmission, which manifests itself globally through better performance and longer transmission life.
- the auxiliary piston has the shape of a collar with a shoulder to hook on the central piston and be driven by its advancement in the direction of thrust of the push rod, while at the same time advancing relative to the central piston by compressing the spring ,
- This embodiment has the advantage of being very simple mechanically and yet protecting the reaction disc in order to prevent excessive displacement, since this is limited by the displacement stroke of the auxiliary piston.
- the advance of the auxiliary piston in the form of a ring, which is pushed onto the end of the push rod, is limited with respect to the push rod by a stop.
- the compression spring is tared for a target pressure in the master cylinder, and this pressure is set in particular to 130 bar.
- the cylindrical member which is a simple member or a simple form of push rod, provides the dual function of guiding and protecting the compression spring to prevent any flexing and, on the other hand, protects the spring from being squeezed together Also, the reaction disc is protected from any excessive deformation which can produce a start of pushing the front of the reaction disc through the central piston.
- the limit pressure set for the target pressure is 130 bar.
- the servo brake according to the invention has the advantage of taking over a large number of elements of known power brakes, so that their integration into a manufacturing or assembly chain is not a particular difficulty and leads to no additional costs.
- Figure 1 is an axial section of an electrohydraulic power brake
- Figures 2A-2B show schematically the connection between the auxiliary piston and the push rod of the electrohydraulic power brake according to the invention
- Figure 2A shows the connection in the lower shear position when the thrust is below the tared force
- Figure 2B is a view analogous to that of Figure 2A of the connection between the auxiliary piston and the push rod in the position which has exceeded the tared push,
- Figure 3 is a graph indicating the force on the brake pedal and emphasizing the evolution of this force below and above the tared push;
- Figure 4 is a graph analogous to that of Figure 3, indicating the reaction force exerted on the control rod in front of and behind the tared thrust.
- Figure 1 is an overall diagram of an electro-hydraulic servo brake consisting of a master cylinder 1 (here a tandem master cylinder), the one Primary piston 11 and a secondary piston 12 which define a primary chamber 13 and a secondary chamber 14, both of which are supplied from a brake fluid reservoir with hydraulic fluid, which can not be seen in Figure 1 and with the primary chamber 13 and the secondary chamber 14 in Connection stands.
- the hydraulic fluid pressurized in these chambers supplies two brake circuits, also not shown.
- the master cylinder 1 is controlled starting from the primary piston 11, which is itself actuated by a push rod 15, which is housed for the most part in the primary piston and its end 151 opposite to that in support against the primary piston 11 via a thrust piston 152 with the auxiliary piston 16 of the electromechanical Part of the servo brake cooperates.
- the auxiliary piston 16 has symmetrically in the sectional plane two racks 161. These racks 161 cooperate with gears 162 which rotate synchronously in opposite directions by being driven by a motor, not shown.
- the gears 162 are installed in the body 3 of the electromechanical part of the power brake.
- the auxiliary piston 16 is pushed back by a return spring 17 in the rest position, which surrounds the rear part of the main piston 11 according to the movement axis XX of.
- the auxiliary piston 16 transmits its thrust to the thrust piston 152 of the push rod 15 by the interposition of a reaction disc 18 whose front side 181 (side on the side of the master cylinder) against the auxiliary piston 151 in support and the rear side 182 (on the side of the brake pedal) on Bottom of the receptacle 163 is in circulation, which is formed by the auxiliary piston 16.
- the auxiliary piston 16 is open at its center about the axis XX and forms the guide passage 164 of a plunger 19, which also comes against the back 182 of the reaction disc 18 in circulation.
- the plunger 19 is connected to the control rod 20 which is itself connected to the brake pedal 21.
- the details of the control rod 20 and the various devices such as the motion sensors to detect the braking request and to evaluate this information are not well-known devices described herein.
- the electrohydraulic servo brake is controlled on actuation of the brake pedal 21, starting from the displacement movement of the control rod 20 (arrow F D ), which hangs on the reaction disc 18 by means of the plunger 19. Their movement is detected by a motion sensor, not shown, to actuate the electric motor of the servo brake to drive the pinion 162, which advances the auxiliary piston 16 by means of the racks 161.
- the auxiliary piston 16 exerts a thrust against the reaction disc 18, which itself pushes the thrust piston 152 of the push rod 15 to push the primary piston 11 and by means of the liquid compressed in the primary chamber 13, the secondary piston 12 of the tandem master cylinder 1.
- the connection between the push rod 15 and the reaction disc 18 (front 181) is made by means of the push piston 152 which is adjustably mounted on the push rod 15 but fixedly connected in translation to the push rod when the adjustment is made was (setting by screwing), so that the entire front 181 of the reaction disc 18 hangs up on the piston 152 of the push rod 15; this piston 152 is itself in the opening of Recording 163 introduced, which receives the reaction disc 18 in the auxiliary piston 16.
- the electro-hydraulic servo brake according to the invention differs from this known electro-hydraulic servo brake by the
- This surrounded by an ellipse in Figure 1 connecting part 100 according to the invention consists of a connecting part 100, a connection shown schematically in Figures 2A and 2B.
- the front or "forward direction” is the direction to the master cylinder.
- the back or “reverse direction” is the direction to the brake pedal.
- the connecting part 100 between the rear end of the push rod 15 and the reaction disc 18 on a support 101 in the form of a disc or a ring which is fixedly connected to the rod 15 and a compression spring 102 receives, which develops a tared force, the one in the master cylinder prevailing setpoint pressure P c corresponds.
- This target pressure is, for example, a pressure of 130 bar. This pressure manifests itself in a reaction force that depends on the geometry of the servo brake and defines the force to which the compression spring 102 is tared.
- the structure of the connecting part 100 is arranged so that the compression spring 102 withstands a load less than or equal to this tared force, and that it yields from the moment when it equals or exceeds a force as this tared force learns.
- the setpoint pressure in the master cylinder by misusing it, is synonymous with the reaction force in the connector, a force for which the connection part 100 changes its mode of operation, ie its boost mode of the servo brake.
- the end 151 of the push rod 15 continues in a main piston 103 about the axis XX.
- This main piston 103 carries an auxiliary piston 104 in the form of an annular collar, provided with a shoulder 1041 around its central opening to be mounted on the end 151 of the push rod 15 in front of the main piston 103.
- This auxiliary piston 104 is from the compression spring
- the end 151 carries a cylindrical portion 153 of large diameter to take the volume in the compression spring 102 and support them.
- This cylindrical part 153 also forms a front stop 154 for the auxiliary piston 104 and limits its advancement in the thrust direction (F M TC).
- F M TC thrust direction
- the auxiliary piston 104 is thus relative to the end 151 of the push rod 15 (and the central piston 103) between its end position to the right according to the figure 2A, pushed by the spring 102 and in contact with the central piston 103, and the other end position to the left ( Figure 2B) movable.
- the displacement range (e) of the auxiliary piston 104 is limited to avoid excessive deformation of the reaction disc 18, which consists of a deformable but incompressible (ie without volume change) elastic material.
- the other side 182 (rear side) of the reaction disc 18 is against the bottom of the receptacle 163 in the auxiliary piston 16 on a centered on the axis XX surface in Form of an overlay in circulation.
- a guide passage 164 which is traversed by the control rod 20 and receives the plunger 19 at the front end of the control rod 20.
- the plunger 19 comes against the back 182 of the reaction disc 18 and against the support ring of the auxiliary piston 16 in circulation.
- Figures 3 and 4 show the transmission of the thrust of the reaction disc 18 below and above the thrust according to the tared reaction of the compression spring 102.
- the target pressure P c which prevails in the master cylinder 1 and the 130 bar is fixed.
- FIG. 3 shows the reaction R ped / which is exerted on the pedal 21 in dependence on the pressure P (force P ped ) in the master cylinder 1, which corresponds to the straight line DR indicating the linear relationship between the force exerted on the pedal (or that of FIG Servo brake applied to the pedal reaction) depending on the pressure in the reaction disc represents.
- the graph of Fig. 4 illustrates the boosting line DR connecting the thrust load B A exerted by the electromechanical servo brake, ie the load exerted by the auxiliary piston 16 whose advancement is controlled by the electric motor with interposition of the sprockets 162 and the two racks 161 depending on the pressure P. becomes, to which the reaction disc is exposed.
- the target pressure P c is emphasized below the load corresponding to the target pressure P c
- the relationship corresponds to the linear relationship representing the boost coefficient of the power brake, but from this target pressure, the boost coefficient follows for each additional load required by the brake system no longer the linear relationship of the straight line DR, but goes to a straight segment DRi, DR 2 with a different pitch.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/888,662 US9707949B2 (en) | 2013-05-03 | 2014-05-02 | Electrohydraulic servo brake |
JP2016508197A JP6212626B2 (ja) | 2013-05-03 | 2014-05-02 | 電気液圧式のサーボブレーキ |
DE112014002262.4T DE112014002262A5 (de) | 2013-05-03 | 2014-05-02 | Elektrohydraulische Servobremse |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1354079 | 2013-05-03 | ||
FR1354079A FR3005294B1 (fr) | 2013-05-03 | 2013-05-03 | Servofrein electrohydraulique |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014177698A1 true WO2014177698A1 (de) | 2014-11-06 |
Family
ID=48795754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/058995 WO2014177698A1 (de) | 2013-05-03 | 2014-05-02 | Elektrohydraulische servobremse |
Country Status (5)
Country | Link |
---|---|
US (1) | US9707949B2 (de) |
JP (1) | JP6212626B2 (de) |
DE (1) | DE112014002262A5 (de) |
FR (1) | FR3005294B1 (de) |
WO (1) | WO2014177698A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3040957A1 (fr) * | 2015-09-14 | 2017-03-17 | Bosch Gmbh Robert | Systeme d'assistance de freinage |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3005295B1 (fr) * | 2013-05-03 | 2015-08-28 | Bosch Gmbh Robert | Systeme de freins a servofrein electrique |
DE102013208672A1 (de) * | 2013-05-13 | 2014-11-13 | Robert Bosch Gmbh | Elektromechanische Bremsvorrichtung für ein Bremssystem und Bremssystem für ein Fahrzeug |
ITTO20131050A1 (it) * | 2013-12-19 | 2015-06-20 | Freni Brembo Spa | Dispositivo attuatore per freni a controllo automatico |
KR102664815B1 (ko) * | 2019-08-05 | 2024-05-10 | 현대모비스 주식회사 | 차량용 전동부스터 |
DE102020109449A1 (de) * | 2020-04-03 | 2021-10-07 | Zf Active Safety Gmbh | Baugruppe für einen elektromechanischen Bremskraftverstärker einer Fahrzeug- Bremsanlage, Bremskraftverstärker mit einer solchen Baugruppe und Fahrzeug-Bremsanlage mit einer solchen Baugruppe |
DE102020109451A1 (de) * | 2020-04-03 | 2021-10-07 | Zf Active Safety Gmbh | Baugruppe für einen elektromechanischen Bremskraftverstärker einer Fahrzeug-Bremsanlage, Bremskraftverstärker mit einer solchen Baugruppe und Fahrzeug-Bremsanlage mit einer solchen Baugruppe |
DE102021121700A1 (de) | 2021-08-20 | 2023-02-23 | Zf Active Safety Gmbh | Betätigungseinheit, Bremskraftverstärker, Fahrzeugbremsanlage und Baugruppe hierfür |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010043203A1 (de) * | 2010-11-02 | 2012-05-03 | Robert Bosch Gmbh | Bremskraftverstärker und Verfahren zum Betrieb eines Bremskraftverstärkers |
WO2012080157A1 (fr) * | 2010-12-15 | 2012-06-21 | Robert Bosch Gmbh | Dispositif d'assistance au freinage et vehicule automobile comportant un tel dispositif |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19542654A1 (de) * | 1995-11-15 | 1997-05-22 | Lucas Ind Plc | Elektronische steuerbare Bremsanlage für Kraftfahrzeuge |
FR2820388B1 (fr) * | 2001-02-07 | 2004-05-28 | Bosch Sist De Frenado Sl | Dispositif de reaction pour servomoteur pneumatique d'assistance au freinage et servomoteur pneumatique d'assistance au freinage comportant un tel dispositif |
DE102010001939B4 (de) * | 2010-02-15 | 2012-05-16 | Robert Bosch Gmbh | Bremskraftverstärker sowie Verfahren und Vorrichtung zu dessen Betrieb |
FR2979089B1 (fr) * | 2011-08-19 | 2014-02-14 | Bosch Gmbh Robert | Systeme de freins dynamique electro-hydraulique et procede de commande |
DE102014205645A1 (de) * | 2013-04-24 | 2014-10-30 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Bremssystems für ein Fahrzeug und Steuervorrichtung für ein Bremssystem eines Fahrzeugs |
-
2013
- 2013-05-03 FR FR1354079A patent/FR3005294B1/fr not_active Expired - Fee Related
-
2014
- 2014-05-02 WO PCT/EP2014/058995 patent/WO2014177698A1/de active Application Filing
- 2014-05-02 DE DE112014002262.4T patent/DE112014002262A5/de active Pending
- 2014-05-02 US US14/888,662 patent/US9707949B2/en not_active Expired - Fee Related
- 2014-05-02 JP JP2016508197A patent/JP6212626B2/ja active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010043203A1 (de) * | 2010-11-02 | 2012-05-03 | Robert Bosch Gmbh | Bremskraftverstärker und Verfahren zum Betrieb eines Bremskraftverstärkers |
WO2012080157A1 (fr) * | 2010-12-15 | 2012-06-21 | Robert Bosch Gmbh | Dispositif d'assistance au freinage et vehicule automobile comportant un tel dispositif |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3040957A1 (fr) * | 2015-09-14 | 2017-03-17 | Bosch Gmbh Robert | Systeme d'assistance de freinage |
WO2017045956A1 (fr) * | 2015-09-14 | 2017-03-23 | Robert Bosch Gmbh | Système d'assistance de freinage |
CN107949507A (zh) * | 2015-09-14 | 2018-04-20 | 罗伯特·博世有限公司 | 制动辅助系统 |
KR20180053688A (ko) * | 2015-09-14 | 2018-05-23 | 로베르트 보쉬 게엠베하 | 브레이크 보조 장치 |
US10493969B2 (en) | 2015-09-14 | 2019-12-03 | Robert Bosch Gmbh | Brake assist system |
KR102540737B1 (ko) | 2015-09-14 | 2023-06-08 | 로베르트 보쉬 게엠베하 | 브레이크 보조 장치 |
Also Published As
Publication number | Publication date |
---|---|
JP2016515495A (ja) | 2016-05-30 |
US9707949B2 (en) | 2017-07-18 |
US20160101767A1 (en) | 2016-04-14 |
FR3005294B1 (fr) | 2015-08-28 |
JP6212626B2 (ja) | 2017-10-11 |
DE112014002262A5 (de) | 2016-02-25 |
FR3005294A1 (fr) | 2014-11-07 |
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