WO2020216480A1 - Dispositif de production de pression de freinage à entraînement électromécanique pour un système de freinage hydraulique - Google Patents

Dispositif de production de pression de freinage à entraînement électromécanique pour un système de freinage hydraulique Download PDF

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Publication number
WO2020216480A1
WO2020216480A1 PCT/EP2020/052785 EP2020052785W WO2020216480A1 WO 2020216480 A1 WO2020216480 A1 WO 2020216480A1 EP 2020052785 W EP2020052785 W EP 2020052785W WO 2020216480 A1 WO2020216480 A1 WO 2020216480A1
Authority
WO
WIPO (PCT)
Prior art keywords
spindle nut
spindle
brake pressure
pressure generator
support sleeve
Prior art date
Application number
PCT/EP2020/052785
Other languages
German (de)
English (en)
Inventor
Sebastian Martin REICHERT
Claus Oehler
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2020216480A1 publication Critical patent/WO2020216480A1/fr

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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/18—Connection thereof to initiating means
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/40—Screw-and-nut

Definitions

  • the present invention relates to an electromechanical
  • Brake pressure generator for a hydraulic brake system of a vehicle according to the features of the preamble of claim 1 and a vehicle comprising an electromechanical brake pressure generator according to the
  • the electromechanical brake pressure generator comprises in particular a spindle drive arrangement for converting a drive-side
  • the driver's foot force is usually not sufficient to brake motor vehicles, so that these are usually equipped with a brake booster.
  • Conventional brake boosters usually work with a negative pressure generated by the internal combustion engine. The pressure difference between the engine pressure and the ambient pressure is used to apply a boosting force to the piston rod of the piston / cylinder unit in addition to the driver's foot force.
  • Electromechanical brake pressure generators of this type can be used not only to provide an auxiliary force, but also in brake-by-wire systems for the sole provision of the actuating force. Electromechanical brake pressure generators are therefore particularly advantageous with regard to autonomous driving.
  • a conventional electromechanical brake booster which is shown in FIG. 1, is known from WO 2017/045804 A1.
  • the invention is directed to an electromechanical brake pressure generator which can apply a braking force independently of an actuation of the brake pedal.
  • the previously known brake booster 1 comprises a
  • the spindle nut 2 is in operative engagement with a spindle 4, which is why the spindle 4 can be set in a translational movement along its spindle axis 5 by means of the spindle nut 2 set in rotation. So that the spindle 4 does not rotate due to the rotation of the spindle nut 2, the brake booster 1 has a bearing arrangement 6 to which the spindle 4 is firmly connected.
  • the bearing arrangement 6 comprises a bracket 6a, on the edges of which two slide bearings 6b are arranged.
  • the slide bearings 6b run on tie rods 7, which run essentially parallel to the spindle axis 5.
  • the spindle 4 is movable in the axial direction and is secured against rotation.
  • the object of the present invention is to specify an electromechanical brake pressure generator with a spindle drive arrangement, which can be manufactured more economically and has improved dry-running properties.
  • the invention specifies an electromechanical brake pressure generator for a hydraulic brake system of a vehicle.
  • the electromechanical brake pressure generator comprises at least one spindle drive arrangement for converting a drive-side rotational movement into one
  • the spindle drive arrangement comprises a spindle and a spindle nut which interact via a thread and can be rotated relative to one another via an electric motor.
  • the spindle or the spindle nut is secured against rotation, so that the spindle or the spindle nut is axially displaceable as a result of a relative rotation, the spindle nut being surrounded coaxially by a support sleeve, the material of the support sleeve having a higher strength than the material of the spindle nut .
  • rotation is understood to mean a rotary movement about an axial axis of the corresponding element to be secured.
  • a support sleeve is understood to be a component that surrounds the spindle nut circumferentially.
  • the support sleeve is preferably cup-shaped.
  • the spindle nut is supported on the outside by the support sleeve surrounding the spindle nut. As a result, the spindle nut is held together by the support sleeve under loads at which the spindle nut would expand.
  • the material of the support sleeve in contrast to the material of the Spindle nut has a higher strength so that it can absorb a load without expanding.
  • the spindle nut which material can have better tribological properties.
  • Tribology examines friction, lubrication and wear of bodies moving against each other. The field of materials that can be selected is increased because a material can be selected which actually does not have sufficient strength for stand-alone operation. A correspondingly selected spindle nut thus has better properties with regard to these factors, so that the spindle nut has improved friction and lubrication and has less wear. The lubrication is improved especially when running dry.
  • the sleeve also provides greater strength.
  • a less expensive material can be used so that the electromechanical brake pressure generator can be produced more economically.
  • the spindle nut which forms the thread is made from a plastic.
  • a spindle nut made of plastic is easy to manufacture by injection molding.
  • plastic is much cheaper than metal.
  • the plastic used is preferably a material which has good tribological properties and which can be used at high temperatures. The plastic of the threaded nut thus has good lubricating properties, so that if the spindle nut runs dry, it can still be operated.
  • a plastic can also be used which has a lower strength.
  • a plastic with a lower strength is usually cheaper. This allows a
  • the support sleeve is formed from a metal.
  • a support sleeve made of metal has the advantage that the metal provides sufficient strength to support the spindle nut is guaranteed. In particular, good heat conduction can be achieved through the metal in order to be able to dissipate the heat quickly. The metals also have sufficient strength even at high temperatures.
  • the support sleeve is made from a plastic. Such a support sleeve can thereby easily by way of
  • Injection molding are produced. Compared to metal it is such
  • Plastic is cheaper and usually lighter than metal.
  • a material can be selected for the plastic which can essentially be used at high temperatures and which has a sufficiently high strength to support the spindle nut. Due to the function of the spindle nut, no good tribological properties are required for the support sleeve, so that a cheaper plastic can be used. Such a support sleeve made of plastic can thereby be produced more economically.
  • the spindle nut and / or the support sleeve have at least one spindle nut lock with which the
  • Spindle nut is fixed in at least one axial direction in the support sleeve. Through the spindle nut lock, the spindle nut can after a
  • a spindle nut lock is thus understood to mean any component by means of which the spindle nut is held in at least one axial direction.
  • This spindle nut lock can be formed both by the support sleeve and by the spindle nut alone or by both.
  • the support sleeve is preferably structurally adapted in such a way that a further spindle nut lock is formed so that the spindle nut is also fixed in the other axial direction.
  • the spindle nut is secured in a direction opposite to the direction of insertion into the support sleeve, so that the spindle nut is secured against dismantling after it has been inserted into the support sleeve.
  • the spindle nut is advantageously secured in both axial directions.
  • the spindle nut lock is advantageously designed as a latching means which has a latching nose and a latching groove which interact with one another in a latching manner. A locking lug and a locking groove are
  • Connecting means with which at least two components can be connected to one another in a force-locking manner in at least one direction.
  • Such latching means are simple and therefore economical to design on the components and thereby form a good possibility for a force-locking connection of these components.
  • the locking lug is designed symmetrically in both axial directions and received in a form-fitting manner in a correspondingly shaped locking groove.
  • the locking lug is preferably designed as a bead. With such a locking lug, the same frictional connection can be established in both axial directions. As a result, the components can be held in two axial directions with such a locking lug and locking groove. This means that additional means for fixing the components in the other axial direction can be omitted. Such an axial fixation in both axial directions can thereby be provided economically.
  • the locking lug is preferably formed on the spindle nut and the locking groove is formed on the support sleeve.
  • a simple groove which is designed as a locking groove, has to be formed on the more solid support sleeve.
  • the somewhat more complex locking lug is accordingly formed on the less rigid spindle nut.
  • the spindle nut is made of plastic, such a locking lug can be easily produced by injection molding.
  • the invention also provides a vehicle with an electromechanical brake pressure generator for a hydraulic brake system.
  • an electromechanical brake pressure generator for a hydraulic brake system.
  • this vehicle can be an automated or completely autonomous vehicle.
  • FIG. 2 Schematic representation of a hydraulic brake system for a
  • Figure 3 longitudinal section of a first embodiment of a
  • Figure 4 enlarged view of a first embodiment of a
  • FIG. 5 shows an enlarged representation of the spindle nut lock according to FIG. 4 after assembly
  • Figure 6 shows an enlarged illustration of a second embodiment
  • FIG. 2 shows a schematic representation of a hydraulic brake system 10 for a vehicle with an electromechanical brake pressure generator 14.
  • the hydraulic brake system 10 comprises the electromechanical brake pressure generator 14.
  • This brake pressure generator 14 comprises a piston / cylinder unit 18, which via a brake fluid reservoir 22 with
  • Brake fluid is supplied.
  • the piston / cylinder unit 18 can be controlled via a brake pedal 26 actuated by the driver and the resulting brake pedal travel is determined by a
  • Pedal travel sensor 30 is measured and passed on to a control unit 34.
  • FIG. 2 shows a brake booster in principle, it is essential here that the brake pedal travel is measured via the pedal travel sensor 30 becomes. Brake pressure generation is also possible without a brake pedal travel, so that the vehicle can also be braked in the autonomous driving state.
  • the control unit 34 generates a control signal for an electric motor 38 of the brake pressure generator 14 based on the measured brake pedal travel.
  • the electric motor 38 which is connected to a transmission (not shown) of the
  • Brake pressure generator 14 is connected, amplified according to the
  • Control signal the braking force input from the brake pedal 26.
  • the brake pedal 26 For this purpose, according to the actuation of the brake pedal 26, one in the
  • Brake pressure generator 14 arranged spindle drive arrangement 40 controlled by the electric motor 38, so that the rotational movement of the electric motor 38 is converted into a translational movement.
  • the brake hydraulics 46 which is shown here only as a box, is formed by various valves and other components for forming an electronic stability program (ESP), for example.
  • ESP electronic stability program
  • the hydraulic brake system 46 is additionally connected to at least one wheel brake device 50, so that a braking force can be applied to the wheel brake device 50 by a corresponding switching of valves.
  • FIG. 3 shows a longitudinal section of a first exemplary embodiment of a spindle drive arrangement 40 according to the invention of the electromechanical brake pressure generator 14.
  • the spindle drive arrangement 40 comprises a spindle 60, which is partially surrounded on the outside by a cup-shaped support sleeve 64.
  • the support sleeve 64 is made of metal in this exemplary embodiment.
  • a spindle nut 68 is arranged between the support sleeve 64 and the spindle 60, which nut is in engagement with a thread 72 of the spindle 60.
  • the spindle nut 68 is made of plastic. Due to the support sleeve 64 arranged on the outside, a plastic material can be selected for the spindle nut 68 which has a smaller one Strength, but has better tribological properties. The tribological properties are selected with regard to a good rotational movement between spindle 60 and spindle nut 68.
  • the spindle nut 68 is secured via a spindle nut lock 84.
  • This spindle nut lock 84 is formed by the support sleeve 64 and the spindle nut 68.
  • the spindle drive arrangement 40 has a further spindle nut lock 84.
  • This spindle nut lock 84 is designed as a projection 86 of the support sleeve 64, on which the spindle nut 68 rests.
  • the spindle nut 68 is secured in an axial direction towards a closed end of the support sleeve 64 by this projection 86.
  • the spindle nut 68 is held in the support sleeve 64 in both axial directions via these two spindle nut locks 84.
  • FIG. This figure shows the spindle nut 68 before it has been completely inserted into the support sleeve 64.
  • the spindle nut lock 84 is formed by latching means.
  • the locking means comprise a locking lug 84a which is formed on the spindle nut 68 and a locking groove 84b which is formed on the support sleeve 64.
  • the latching lug 84a is shaped in such a way that when the spindle nut 68 is pushed into the support sleeve 64, the latching lug 84a has a uniformly rising elevation which, at its highest point, extends abruptly onto a peripheral surface 94 of the spindle nut 68.
  • the locking groove 84b is formed in the support sleeve 64 in the form of a rectangular groove.
  • FIG. 5 shows an enlarged illustration of the spindle nut lock 84 according to FIG. 4 after assembly.
  • This figure shows that the length of the latching groove 84b is dimensioned such that the latching lug 84a is received completely in the region of the latching groove 84b.
  • the locking groove 84b has the same length as the locking lug 84a.
  • the figure shows that the corresponding design of the locking lug 84a and the locking groove 84b, these can be connected to one another in a latching manner.
  • the support sleeve 64 is axially fixed by the locking means through the connection in the direction of the support sleeve opening 80.
  • This spindle nut lock 84 like the spindle nut lock 84 shown in FIGS. 4 and 5, is designed as a latching means.
  • the locking lug 84a is designed in the form of a bead.
  • This locking lug 84a has a symmetrical shape in both axial directions.
  • the locking groove 84b which on the
  • Support sleeve 64 is formed has the same shape as the locking lug 84a.
  • the locking lug 84a can be positively received in the locking groove 84b.
  • the spindle nut 68 is thereby fixed in both axial directions by means of the locking means.
  • a projection 86 shown in FIG. 3 as a spindle nut lock 84 can be omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

L'invention concerne un dispositif de production de pression de freinage électromécanique (14) pour un système de freinage (10) hydraulique d'un véhicule. Le dispositif de production de pression de freinage (14) électromécanique comprend au moins un ensemble formant mécanisme à broche (40) servant à transformer un mouvement de rotation côté entraînement en un mouvement de translation pour produire une pression de freinage hydraulique. L'ensemble formant mécanisme à broche (40) comprend une broche (60) et un écrou (68) de broche, lesquels coopèrent par l'intermédiaire d'un filetage (72) et peuvent tourner l'un par rapport à l'autre par l'intermédiaire d'un moteur électrique (38). La broche (60) ou l'écrou (68) de broche est bloqué pour empêcher toute rotation de sorte que suite à une rotation relative, la broche (60) ou l'écrou (68) de broche peut être coulissé axialement. L'écrou (68) de broche est entouré de manière coaxiale par une douille d'appui (64). Le matériau de la douille d'appui (64) présente une plus grande solidité que le matériau de l'écrou (68) de broche.
PCT/EP2020/052785 2019-04-25 2020-02-04 Dispositif de production de pression de freinage à entraînement électromécanique pour un système de freinage hydraulique WO2020216480A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019205976.7A DE102019205976A1 (de) 2019-04-25 2019-04-25 Elektromechanisch antreibbarer Bremsdruckerzeuger für ein hydraulisches Bremssystem eines Fahrzeugs und Fahrzeug umfassend einen elektromechanischen Bremsdruckerzeuger
DE102019205976.7 2019-04-25

Publications (1)

Publication Number Publication Date
WO2020216480A1 true WO2020216480A1 (fr) 2020-10-29

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PCT/EP2020/052785 WO2020216480A1 (fr) 2019-04-25 2020-02-04 Dispositif de production de pression de freinage à entraînement électromécanique pour un système de freinage hydraulique

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WO (1) WO2020216480A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022210239A1 (de) 2022-09-28 2024-03-28 Robert Bosch Gesellschaft mit beschränkter Haftung Elektromechanisch antreibbarer Bremsdruckerzeuger mit einer Spindeltriebanordnung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009959B3 (de) * 2006-03-03 2007-10-04 Lucas Automotive Gmbh Elektromechanischer Bremsdruckerzeuger für eine Kraftfahrzeugbremsanlage
WO2011147609A1 (fr) * 2010-05-26 2011-12-01 Robert Bosch Gmbh Système de freins à servofrein à vis à billes coaxiales
DE102014202568A1 (de) * 2014-02-12 2015-08-13 Volkswagen Aktiengesellschaft Elektromechanischer Bremskraftverstärker
DE102016209670A1 (de) * 2015-06-15 2016-12-15 Robert Bosch Gmbh Betätigungsvorrichtung eines Bremsassistenzsystems
DE102015217522A1 (de) * 2015-09-14 2017-03-16 Robert Bosch Gmbh Elektromechanischer Bremskraftverstärker und Bremssystem
WO2017194674A1 (fr) * 2016-05-13 2017-11-16 Continental Teves Ag & Co. Ohg Dispositif de freinage pour système de freinage hydraulique de véhicule automobile avec vis à billes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009959B3 (de) * 2006-03-03 2007-10-04 Lucas Automotive Gmbh Elektromechanischer Bremsdruckerzeuger für eine Kraftfahrzeugbremsanlage
WO2011147609A1 (fr) * 2010-05-26 2011-12-01 Robert Bosch Gmbh Système de freins à servofrein à vis à billes coaxiales
DE102014202568A1 (de) * 2014-02-12 2015-08-13 Volkswagen Aktiengesellschaft Elektromechanischer Bremskraftverstärker
DE102016209670A1 (de) * 2015-06-15 2016-12-15 Robert Bosch Gmbh Betätigungsvorrichtung eines Bremsassistenzsystems
DE102015217522A1 (de) * 2015-09-14 2017-03-16 Robert Bosch Gmbh Elektromechanischer Bremskraftverstärker und Bremssystem
WO2017045804A1 (fr) 2015-09-14 2017-03-23 Robert Bosch Gmbh Servofrein électromécanique et système de freinage
WO2017194674A1 (fr) * 2016-05-13 2017-11-16 Continental Teves Ag & Co. Ohg Dispositif de freinage pour système de freinage hydraulique de véhicule automobile avec vis à billes

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