EP2760717A1

EP2760717A1 - Brake booster device for a braking system of a vehicle, and method for producing a brake booster device for a braking system of a vehicle

Info

Publication number: EP2760717A1
Application number: EP12745686.1A
Authority: EP
Inventors: Andreas Birkheim; Reinhard Weiberle; Matthias Kistner; Karl-Heinz Willmann
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2011-09-30
Filing date: 2012-08-07
Publication date: 2014-08-06
Also published as: WO2013045154A1; JP2014531363A; DE102011083815A1; KR20140069042A; US20140345270A1; US9969375B2; CN103826947B; CN103826947A

Abstract

The invention relates to a brake booster device for a braking system of a vehicle, comprising a booster body (10) onto which a brake-boosting force (Fu) can be exerted by means of an actuator device (12), and comprising a first piston rod component (14) to which the brake-boosting force (Fu) can be at least partially transmitted via a first force-transmitting contact between the first piston rod component (14) and the booster body, said first piston rod component contacting the booster body (10) at a first contact surface (16), or via a first connecting component (18) such that the first piston rod component (14) can be at least partially adjusted. The brake booster device also comprises a second piston rod component (22) to which the brake-boosting force (Fu) can be at least partially transmitted via a second force-transmitting contact between the second piston rod component (22) and the booster body (10), said second piston rod component contacting the booster body (10) at a second contact surface (24), or via a second connecting component (40) such that the second piston rod component (22) can be adjusted together with the first piston rod component (14). The invention further relates to a method for producing a brake booster device for a braking system of a vehicle.

Description

Description title

Brake booster device for a brake system of a vehicle and

The invention relates to a brake booster device for a brake system of a vehicle. Likewise, the invention relates to a brake device for a brake system of a vehicle and a brake system for a vehicle. Furthermore, the invention relates to a method for producing a brake booster device for a brake system of a vehicle, for a brake device of a brake system of a vehicle and for a brake system of a vehicle.

PRIOR ART DE 10 2009 047 263 A1 describes a brake booster. By means of the electromechanical brake booster, a brake assist force is exerted on an amplifier body such that the adjustment of the booster body, the brake assist force is at least partially transferable to an output element with a push rod that the push rod at least partially into a

Master cylinder is hineinverstellbar.

DISCLOSURE OF THE INVENTION The invention provides a brake booster device for a brake system of a vehicle having the features of claim 1, a braking device for a brake system of a vehicle having the features of claim 6, a brake system for a vehicle having the features of claim 9, a manufacturing method for a vehicle

Brake booster device for a brake system of a vehicle with the

Features of claim 10, a manufacturing method for a brake device of a brake system of a vehicle having the features of claim 1 1 and a A manufacturing method for a brake system of a vehicle having the features of claim 12.

The first rod piston component and / or the second rod piston component may be a rod piston. It is noted, however, that the first

Rod piston member and the second rod piston member are not limited to training as a rod piston. In particular, the feasibility of the first

Rod piston component and / or the second rod piston component is not limited to a particular type of rod piston.

In addition, the first rod piston component and / or the second

Rod piston component can also be designed as contact parts for each rod piston. In this case, the first rod piston component and / or the second

Rod piston component also be adapted to transmit a force to each one arranged or arrangeable rod piston independently of each other so that the rod piston by means of the transmitted force is adjustable so that a liquid-filled pressure volume of the master cylinder can be reduced.

The first rod piston component and / or the second rod piston component may be formed in one piece / in one piece. Likewise, the first rod piston component and / or the second rod piston component can also be constructed from a plurality of composite subunits. The use of the term "component" defines the

Constructability of the first rod piston component and / or the second

Rod piston component not stuck to a one-piece design.

Advantages of the invention

The present invention realizes separation / division of one into one

Pressure chamber of the master cylinder in adjustable piston rod component

(Primary piston) into different segments / piston / bolt components. By means of the realized separation a stepped brake booster is possible. In particular, the Einbremsfläche be varied in the master cylinder in this way. In an advantageous embodiment, the brake booster device comprises an input rod component to which a brake actuation element can be arranged in such a way that in that a driver braking force exerted on the brake actuating element can be transmitted to the input rod component. This is preferably

Entrance rod component at least temporarily in such a way in contact with the first rod piston component that the driver brake force is at least partially transferable to the first rod piston component, while at least partial transfer of the driver brake force is prevented to the second rod piston component. This design of the brake booster device has the advantage that, in operation, the brake assist force is partially directly increased to increase in the

Master cylinder present internal pressure on the second rod piston component is exercisable, while a part of the brake assist force is applied to support the braking operation by the driver on the first rod piston member.

Preferably, in the presence of the actuator device in a deactivated state, the first rod piston component is adjustable by means of the at least partially transmitted thereto driver braking force. In a functional impairment of the actuator device, such as in a failure of the actuator device, thus a hydraulic ratio is activated, which compared to the prior art in a driver's braking force exerted by the driver, a higher increase in the

Internal pressure causes in the master cylinder. This can also be described in such a way that the brake booster device can still be used as a volume booster in the event of a functional impairment of the actuator device.

For example, the second rod piston component may have a continuous recess, wherein the first rod piston component is at least partially adjustably arranged within the continuous recess. Thus both can

Rod piston components are easily adjusted by an opening of the master cylinder.

Alternatively, the first rod piston member may be adjustable in an adjustment direction by a first opening of a master cylinder, the second

Rod piston component in the adjustment direction through a second opening of the

Master cylinder is adjustable. As will be explained in more detail below, such an arrangement and design of the two piston rod components allows an advantageous design of the master cylinder. The above-mentioned advantages are in a brake device for a brake system of a vehicle with such a brake booster device and a

Master cylinder ensured. In an advantageous embodiment, the first rod piston component and the second rod piston component can protrude into a first pressure chamber of the master brake cylinder such that a first residual volume of the first cylinder can be filled with liquid

Pressure chamber is variable by means of an adjustment of the first rod piston component and / or the second piston rod member, wherein the master cylinder has a second pressure chamber, in which a floating piston member protrudes so that a liquid-fillable second residual volume of the second pressure chamber by means of adjusting the floating piston component is variable. The advantageous brake device can thus also be equipped with a tandem master cylinder. The advantageous braking device is therefore suitable for a variety of different brake circuit designs.

As an alternative or in addition to this, the first rod piston component can project into a first partial pressure chamber of the master brake cylinder such that a first partial residual volume of the first partial pressure chamber which can be filled with liquid can be varied by means of an adjustment of the first rod piston component, wherein the second rod piston component is in a second partial pressure chamber of the master cylinder is delimited by a continuous or interrupted partition wall of the first partial pressure chamber, so protrudes that a liquid-filled second partial residual volume of the second partial pressure chamber is variable by means of adjusting the second piston rod member. Such a design of the master cylinder ensures greater

Design freedoms.

The advantages described above are also achieved in the case of a corresponding brake system having at least one brake circuit and a brake booster device and a master brake cylinder or a corresponding brake device.

In addition, the advantages are also realized in a corresponding manufacturing method for a brake booster device for a brake system of a vehicle. Likewise, the advantages result in carrying out a manufacturing method for a brake device of a brake system of a vehicle. Furthermore, the advantages can be realized by executing a corresponding production method for a brake system of a vehicle.

Brief description of the drawings

Further features and advantages of the present invention will be explained below with reference to the figures. Show it:

Fig. 1 is a schematic representation of a first embodiment of

Brake booster device;

Fig. 2 is a schematic representation of a second embodiment of the

Brake booster device;

3a and 3b are functional diagrams illustrating a third embodiment of the brake booster device; and FIG. 4 is a schematic representation of an embodiment of the invention

Braking device.

Embodiments of the invention

Fig. 1 shows a schematic representation of a first embodiment of the

Brake booster device.

The brake booster device represented schematically in FIG. 1 can be used in a (hydraulic) brake system of a vehicle. The

Brake booster device comprises an amplifier body 10, on soft means of an actuator means 12, a brake assist force Fu is exercisable such that the booster body 10 is adjustable by means of the brake assist force Fu. Of the

Amplifier body 10 may be formed, for example, as a valve body. The

However, the formability of the amplifier body 10 is relatively freely variable for advantageous interaction with the actuator device 12. The actuator device 12 can for example, be an electromechanical device or a hydraulic device. However, the designability of the actuator device 12 is not limited to these examples mentioned. The brake booster device also includes a first rod piston member 14. The first rod piston member 14 is disposed in relation to the booster body 10 such that the brake assist force Fu is at least partially transferable to the first rod piston member 14. The transmission of the brake assist force Fu can take place, for example, via a first force-transmitting contact between the first rod piston component 14 contacting a first contact surface of the amplifier body and the amplifier body 10. As an alternative, the first

Power transmission contact for at least partially transmitting the

Brake assist force Fu also via a first rod piston member 14 and the first contact surface 16 of the booster body 10 contacting first

Connection component 18 run. The first connection component 18 may be, for example, a reaction disk. The practicability of the first

However, connection component 18 is not limited to a reaction disk.

The at least partial transmission of the brake assist force Fu over the first power transmission contact can be carried out in such a way that the first rod piston component 14 is adjustable. In particular, if the first rod piston component 14 is arranged on a master cylinder 20, by means of the at least partial transmission of the brake support force Fu for adjusting the first rod piston component 14, a liquid-fillable volume in the master cylinder 20 can be reducible (in size).

In addition, the brake booster device also includes a second one

Rod piston component 22, on which via a second force transmission contact, the brake assist force Fu is at least partially transferable such that the second rod piston member 22 is adjustable together with the first rod piston member 14. Also, by means of the at least partial transmission of the brake assist force Fu for adjusting the second rod piston component 22, a liquid-fillable volume in the master brake cylinder 20 can be reducible (in its size). The second power transmission contact may be between a second contact surface 24 of the

Amplifier body 10 contacting second rod piston member 22 and the

Amplifier body 10 run. As an alternative, the second one Power transmission contact between the second rod piston member 22 and the amplifier body 10 via a (not shown) second connection component, which contacts the second contact surface 24 of the amplifier body 10, effected. The first rod piston component 14 and / or the second rod piston component 22 may in an advantageous embodiment be designed as a rod piston. In particular, the first rod piston component 14 and the second rod piston component 22 may be arranged or arrangeable on the master brake cylinder 20 such that the first one

Rod piston member 14 and the second rod piston member 22 a (variable in size) variable pressure chamber 21 of the master cylinder 20 limit. The first

Rod piston component 14 and / or the second rod piston component 22 can thus be designated as master brake cylinder primary piston and / or as master brake cylinder rod piston / part rod piston. The feasibility of

However, rod piston components 14 and 22 is not limited to a particular rod or piston shape.

It should be noted that the first rod piston member 14 and the second rod piston member 22 are not limited to a configuration as a rod piston. Instead, the first rod piston component 14 and / or the second

Rod piston member 22 may also be formed as contact parts for each rod piston. In this case, the first rod piston member 14 and / or the second rod piston member 22 may also be adapted to independently transmit a force to a rod piston arranged thereon or independently such that the rod piston is adjustable by means of the transmitted force so that one with Fluid fillable pressure volume of the master cylinder 20 is reduced.

The first rod piston component 14 and / or the second rod piston component 22 may be formed in one piece / in one piece. Likewise, the first rod piston component 14 and / or the second rod piston component 22 can also be constructed from a plurality of assembled subunits.

The first contact surface 16 can also be understood as meaning a plurality of mutually separate partial surfaces. Accordingly, the second contact surface 24 may be divided into a plurality of separate partial surfaces. (The use of the

Singulars in the term "contact surface" is only for better clarity.) It is noted, however, that under the first contact surface 16 and the second contact surface 24 different (total) surfaces are to be understood. One can also rewrite this so that the two contact surfaces 16 and 24 touch at most, but do not overlap. Similarly, under the contact surfaces 16 and 24 are not to understand congruent surfaces.

The first rod piston component 14 is preferably adjustable without moving the second rod piston component 22. The advantageous adjustability of the first

Rod piston component 14 can be independent of a position of the second

Rod piston component 22 be. Accordingly, the second

Rod piston member 22 without moving along the first rod piston member 14 and / or be independent of a position of the first rod piston member 14 adjustable.

The schematically illustrated in Fig. 1 brake booster device

thus realizes a brake booster which acts on two independently adjustable rod piston components 14 and 22. The first

Rod piston component 14 can be assigned a first boundary surface F1, along which an adjustment of the first piston rod component 14 a volume variation of the (variable in size) pressure chamber 21 of the

Master cylinder 20 causes. This can also be described in such a way that a force transmitted to the first piston rod component 14 at the first

Limiting surface F1 the pressure in the pressure chamber 21 of the

Brake master cylinder 20 is opposite. Accordingly, the second

Rod piston member 22 are associated with a second boundary surface F2 at which by means of the force transmitted to the second rod piston member 22 in the pressure chamber 21 of the master cylinder 20 can be braked. The

independent adjustability of the rod piston components 14 and 22 thus causes a variability of the Einbremsfläche in the pressure chamber 21 of the

Master Cylinder 20. The benefits to come will be discussed below

discussed in more detail.

In the illustrated embodiment, the second rod piston component 22 has a continuous recess 26 into which the first rod piston component at least partially protrudes. The first rod piston component 14 is arranged adjustable within the continuous recess 26. Further arrangements for the two rod piston components 14 and 22 will be described in more detail below. The two rod piston components 14 and 22 protrude into an opening of the master cylinder 20. In order to prevent a leakage of brake fluid along an opening edge 28 of the opening, a sealing element 30, such as a sealing ring, may be disposed between the opening edge 28 and the second rod piston component 22. Likewise, leakage of liquid through the through-cutout 26 is preventable by being within the continuous one

Recess 26 between the second rod piston member 22 and the first

Rod piston member 14, a further sealing element 32, such as a sealing ring, is arranged.

In an advantageous embodiment, the brake booster device comprises an input rod component 34, to which a brake actuation element 36 can be arranged in such a way that a driver brake force Fb exerted on the brake actuation element 36 can be transmitted to the input rod component 34. The disposable

Brake actuator 36 may be, for example, a brake pedal. Instead of a brake pedal, however, a differently designed brake actuating element 36 can be arranged on the input rod component 34. Preferably, the input rod member 34 is at least temporarily in (force) contact with the first rod piston member 14 such that the driver brake force Fb is at least partially transferable to the first rod piston member 14 while preventing at least partial transmission of the driver brake force Fb to the second rod piston member 22 , Preventing at least a partial transmission of the driver braking force Fb to the second piston rod component 22 is not an active process. Instead, the input rod member 34 may at least temporarily contact the first rod piston member 14 such that no driver braking force Fb is transmitted to the second rod piston member 22. In the brake booster device shown schematically in FIG. 1, the first rod piston component 14 is movable by the driver brake force Fb (assisted by the actuator device 12). In contrast, the second rod piston component 22 without a force of the driver by means of the actuator device 12 is movable. In particular, in the presence of the actuator device 12 in a deactivated state, the first rod piston component 14 by means of at least partially already transmitted driver brake force Fb be at least partially adjustable in the master cylinder. The advantageous divided design of the rod piston is connected in this case with the advantage that when a functional impairment of the actuator device 12 by means of an actuation of the brake actuating element 36, only the first

Rod piston member 14 is movable while the second rod piston member 22, despite the operation of the brake operating member 36 by the driver remains in a certain position. The driver does not have to do so with the total braking surface equal to the sum of the boundary surfaces F1 + F2, but only with a reduced

Einbremsfläche equal to the first boundary surface F1, brakes in the pressure chamber 21 of the master cylinder 20. In this way, by means of a changed hydraulic ratio, a higher braking effect despite a constant driver braking force Fb. One can also rewrite that due to the reduced Einbremsfläche equal to the first boundary surface F1, the driver brake force Fb causes a larger pressure build-up in the master cylinder 20.

Fig. 2 shows a schematic representation of a second embodiment of the

Brake booster device.

The brake booster device shown schematically in FIG. 2 has the components already described above. As can be seen in FIG. 2, the first connection component 18a and 18b can also be designed in several parts. In particular, the first connection component 18a and 18b may comprise a reaction disk 18a and a connection piston 18b. In addition, in addition to the first connection component 18a and 18b, a (one-piece or multi-part) second connection component 40 can be arranged between the second rod piston component 22 and the amplifier body 10, which guarantees the second force transmission contact, wherein the second connection component 40 forms the second contact surface 24 of FIG Amplifier body 10 contacted. To reliably reset the first connection component 18a and 18b and / or the second connection component 40 to a starting position when the (not shown) is not actuated

To ensure brake actuation element, a first return spring 42 of the first connection component 18a and 18b and a second return spring 44 of the second connection component 40 may be assigned. The input rod member 34 may be guided through a central bore of the booster body 10. By means of a arranged in the central bore 46 sealing element 48, such as a sealing ring, leakage of liquid can be prevented. In particular, a sealing element 48 designed as a sealing ring can be fastened in a simple manner in a preferred operating position by means of a groove 50 formed in the booster body 10 or the input rod component 34.

In the illustrated embodiment, the brake booster device is disposed on a master cylinder 20 formed as a tandem master cylinder. The thus formed master cylinder has, in addition to a first pressure chamber 52, in which the first rod piston member 14 and the second rod piston component 22 are at least partially hineinverstellbar in a common adjustment direction 54, still a second pressure chamber 56. A floating piston component 58 can be at least partially adjustable into the second pressure chamber 56. It will be on it

It is pointed out that neither the first rod piston component 14 nor the second rod piston component 22 is a floating piston component 58.

Instead, the two rod piston components 14 and 22 are jointly designed to control a first internal pressure in the first pressure chamber 52, while by means of the floating piston component 58, a second internal pressure in the second

Pressure chamber 56 is adjustable / fixable. The advantageously designed brake booster device can thus also be used together with a master cylinder 20 designed as a tandem master cylinder. It is noted, however, that the advantageous

Brake booster device with a master cylinder 20 with only one pressure chamber 52, in which the two rod piston components 14 and 22nd

are adjustable, can be used.

The first rod piston component 14 may have a diameter d1 which, for example, is equal to half of a second diameter d2 of the second

Rod piston component 22 is. In this case, even with a functional impairment of the actuator device, if only by means of the driver brake force Fb an increase of the internal pressure in the master cylinder 20 is executable, ensures a comparatively large translation of the driver brake force Fb in a pressure increase. The

However, dimensions of the rod piston components 14 and 22 are not limited to the diameters d1 and d2 shown here by way of example. (Also, the extension diameter Dv shown in FIG. 2 is to be interpreted only as an example.) FIGS. 3a and 3b are functional diagrams showing a third embodiment of the brake booster device.

The brake booster device 70 shown schematically in FIGS. 3a and 3b is shown in different functional states. FIG. 3a illustrates the operation of the brake booster device 70 with assured usability of the brake booster actuator. In contrast, Fig. 3b shows the operation of the brake booster device 70 in a functional impairment, such as a failure, the brake booster actuator.

Both with a guaranteed applicability of Bremskraftverstärkeraktorik as well as a functional impairment of Bremskraftverstärkeraktorik is a

Input rod member 34 adjustable by means of a driver braking force Fb. In this case, at least a part Fb 'of the driver braking force Fb on a reaction disc 18a

transfer. A differential travel spring 72, which is arranged between the input rod component 34 and the booster body 10 of the brake booster device 70, can be compressed against a spring force Ff72.

In the reproduced in Fig. 3a mode of operation in a guaranteed

Einsetzbarkeit the brake booster actuator is the operation of the

Input rod member 34 also by means of a sensor 74, such as a brake force sensor, determined. For example, the sensor 74 determines a sensor size S1 corresponding to the driver braking force Fb. Thereafter, the sensor 74 outputs a sensor signal S1 corresponding control signal 76 to a controller 12a a

Actuator off. The controller 12a of the actuator device can be designed to provide a voltage signal 76 corresponding to the sensor signal 75 to an engine 12b of the actuator device. Optionally, the controller 12a is additionally configured to provide the motor 12b upon the provision of the voltage signal 76

Rotation angle signal 78 of an arranged on the motor 12b rotation angle sensor 12c of the actuator device to be considered.

The motor 12b controlled by the controller 12a applies a torque 80 to the threaded components 12d and 12e of the actuator device. By actuating the threaded components 12d and 12e of the actuator device is at least one

Brake assist force Fu transferable to a support bolt member 82. In this case, the support bolt component 82 is adjusted against a frictional force Fr1, that the brake assist force Fu is transmitted to the booster body 10 and the booster body 10 against a friction force Fr2 by means of

Brake assist force Fu is adjusted. The amplifier body 10 contacts a first contact surface

Reaction disk guide 84 so that the reaction disk guide 84 is adjusted by at least the transmitted thereon first partial brake assist force Fu1 against a frictional force Fr3. By adjusting the

Reaction disk guide 84, the first partial brake assist force Fu1 is transmitted to the above-mentioned reaction disc 18a. It can the

Reaction disk against a tensile force Fr4 be deformed. At the same time, the reaction disc 18a transmits during an operation of the

Brake actuating element in the presence of the actuator device in a function-guaranteeing state, the sum of the at least partially transmitted driver brake force Fb 'and the first partial brake assist force Fu1 (total force Fb' + Fu1) on the above-mentioned connecting element 18b and further on a first rod piston component 14. ( The adjustment movement of the connecting element 18b by means of the total force Fb '+ Fu1 transmitted thereto can counteract an inertial force Ft and / or a frictional force Fr5.)

The first rod piston component 14 is at least partially by means of the transmitted total force Fb '+ Fu1 in a first pressure chamber of the master cylinder 20

inside adjustable. The first adjustment of the first piston rod component 14 into the first pressure chamber counteracts a first pressure p1 present therein or a counterforce Fg corresponding to the first pressure p1. By adjusting the first piston rod component 14 into the first pressure chamber of the master brake cylinder 20, the first pressure P1 is increased and thus a first brake pressure pb1 is built up in at least one first wheel brake caliper hydraulically connected to the first pressure chamber. In addition, the first rod piston member 14 so on a

Connection component 86 may be connected to a floating piston 58, that the floating piston 58 at at least partially into a second pressure chamber is hineinverstellbar when Hineinverstellen the first rod piston member 14 in the first pressure chamber. The internal adjustment of the floating piston 58 in the second pressure chamber counteracts a second pressure p2. By means of the internal displacement of the floating piston 58 into the second pressure chamber, the pressure p2 can be increased so that a second brake pressure pb2 in at least one hydraulically connected to the second pressure chamber second Radbremszange is buildable.

The booster body 10 also contacts a second rod piston member 22 such that a second partial brake assist force Fu2 is transferable to the second rod piston member 22 and the second rod piston member 22 is biased against the spring forces Ff42 and Ff44 of the above-described springs 42 and 44 into the first pressure chamber of the master cylinder 20 is adjustable. (In particular, the spring 44 can be slightly compressed by means of a deformation force Fd.) By means of adjusting the second rod piston component 22 in the first pressure chamber of the master cylinder 20, the first pressure present therein p1 can be further increased, so that the forwarded to the at least one first Radbremszange First brake pressure pb1 can also be increased by means of the second partial brake assist force Fu2. Likewise, by the additional pressure build-up in the first pressure chamber of the

Master cylinder 20, the second pressure p2 and the second brake pressure pb2 be increased.

3b shows the functional diagram in the presence of the actuator device in a function-impaired state. Thus, no brake assist force Fu can be exerted on the booster body 10 by means of the actuator device. However, the first rod piston component can still be adjusted by means of the driver brake force Fb, which is at least partially transmitted thereto. While the second

Rod piston component remains in a constant position / position, are thus by means of adjusting the first rod piston member 14 of the present in the first pressure chamber first pressure p1 and the connection component in the second

Pressure chamber present second pressure p2 even steigerbar. Instead of being braked in the first pressure chamber at the boundary surfaces of both rod piston components 14 and 22 is braked only with the boundary surface of the first rod piston member 14 in the first pressure chamber.

Due to the presence of the actuator device in a function-impaired state reduced Einbremsfläche a better force-pressure ratio can be effected. Due to the achievable comparatively high force-pressure transmission ratio, the driver can use the

Driver braking force Fb a comparatively large first pressure p1 in the first

Pressure chamber of the master cylinder 20, and also connected to one comparatively large first brake pressure pb1 in the at least one first

Cause wheel brake pliers. Accordingly, due to the advantageous pressure-force transmission ratio, a comparatively large second pressure p2, or a comparatively large second brake pressure pb2, can also be realized by means of the driver braking force Fb.

Fig. 4 shows a schematic representation of an embodiment of the braking device.

The schematically illustrated in Fig. 4 brake device has a

Brake booster device and a master cylinder 20. The brake device can be used in a brake system with at least one brake circuit 100a and 100b, each with at least one wheel brake caliper 102a and 102b. However, since the usability of the braking device does not depend on a specific design of the at least one

Brake circuit 100a and 100b is limited, the individual components of the at least one brake circuit 100a and 100b will not be discussed further.

In the illustrated embodiment, the first rod piston component 14 is in an adjustment direction 54 through a first opening 104 of the master cylinder 20

adjustable, while the second rod piston member 22 is adjustable in the adjustment direction 54 by a second opening 106 of the master cylinder 20. This can also be described in such a way that the first rod piston component 14 projects into a first partial pressure chamber 52a of the master brake cylinder 20 such that a first partial residual volume of the first partial pressure chamber 52a which can be filled with liquid can be varied by means of an adjustment of the first rod piston component 14,

while the second rod piston component 22 projects into a second partial pressure chamber 52b of the master brake cylinder 20 in such a way that a second partial residual volume of the second partial pressure chamber 52b which can be filled with liquid can be varied by means of adjusting the second rod piston component 22. Between the first

Partial pressure chamber 52a and the second partial pressure chamber 52b, a continuous or interrupted partition 108 is formed.

If a fluid exchange between the two partial pressure chambers 52a and 52b is ensured, the two partial pressure chambers 52a and 52b can be used as

Subunits of a common pressure chamber are considered. In this

Case is a common first pressure in the two partial pressure chambers 52a and 52b adjustable. Thus, it is sufficient, only one of the two Partial pressure chambers 52 a and 52 b to connect via a spigot bore 1 10 with a brake fluid reservoir 1 12.

The liquid exchange between the two partial pressure chambers 52a and 52b can be ensured, for example, by forming at least one throughflow opening in the interrupted dividing wall 108. In a continuous

Partition 108 can also both partial pressure chambers 52 a and 52 b to a

common first brake circuit 100a connected / connected. If neither of the two partial pressure chambers 52a and 52b by means of a closing of a

Separating valve is decoupled from the first brake circuit 100a, in this case, the liquid exchange between the two partial pressure chambers 52a and 52b

allows.

In the illustrated embodiment, the master cylinder 20 is as

Tandem master cylinder formed, which in addition to the first

Partial pressure chamber 52a and the second partial pressure chamber 52b, which together form a first pressure chamber, nor a second pressure chamber 56 has. It should be noted, however, that the design of the master cylinder 20 described here as a tandem master cylinder is merely optional. Besides, that is

Input rod component 34 can also be used as the first connection component 18.

The above-described embodiments of the brake booster device and the brake device are easily by means of a choice of the dimensions of their

Components can be designed so that even with a driver braking force of 500N a vehicle deceleration of 2.44 m / s ² even at a significant

Functional impairment of the actuator device, due to which no

Brake support force is available, is achievable. With all embodiments, higher delays can be achieved in the event of a failure of the actuator device. In addition, in all embodiments of the master cylinder 20 can be designed without regard to the achievable in case of failure of the actuator device delay.

Another advantage of the above-described embodiments of

Brake booster device and the braking device is that the awakening of the brake system to meet other requirements, such as

Generation of a vehicle deceleration of 6.44 m / s ² at 500N driver braking force, even with a withdrawn ignition key can be fulfilled. In addition, by means of the above described technology brake booster devices are manufactured with a reduced complexity.

The advantageous manufacturing methods are schematically illustrated by the above-described embodiments of the brake booster device and the brake device. On an additional description of the

Manufacturing process is therefore omitted here.

Claims

claims

1 . Brake booster device (70) for a brake system of

A vehicle comprising: an amplifier body (10) on which a brake assist force (Fu) can be exerted by means of an actuator device (12) such that the amplifier body (10) is adjustable by means of the brake assist force (Fu); and a first rod piston component (14), to which a first force-transmitting contact between the first body (10) contacting the amplifier body (10) at a first contact surface (16)

Rod piston component (14) or via a first rod piston component (14) and the first contact surface (16) of the amplifier body (10) contacting the first connection component (18)

Bremsunterstützungskraft (Fu) is at least partially transferable such that the first rod piston component (14) is at least partially adjustable; characterized by a second rod piston component (22), to which a second force transmission contact between the second body (10) contacting the amplifier body (10) on a second contact surface (24)

Rod piston component (22) and the amplifier body (10) or via a second rod piston member (22) and the second contact surface (24) of the amplifier body (10) contacting second

Connection component (40), the brake assist force (Fu) is at least partially transferable such that the second

Rod piston component (22) together with the first

Rod piston component (14) is adjustable. The brake booster device (70) according to claim 1, wherein the brake booster device (70) comprises an input rod member (34) to which a brake operating member (36) can be arranged such that a force applied to the brake operating member (36)

Driver braking force (Fb) is transferable to the input rod member (34), and wherein the input rod member (34) at least temporarily in such contact with the first rod piston member (14) that the driver brake force (Fb) at least partially on the first rod piston member (14) is transferable while an at least partial transfer of the driver braking force (Fb) to the second

Rod piston component (22) is prevented.

The brake booster device (70) according to claim 2, wherein, in the presence of the actuator device (12) in a deactivated state, the first rod piston component (14) is adjustable by means of the driver brake force (Fb) transmitted thereto at least temporarily.

The brake booster device (70) according to any one of the preceding claims, wherein the second rod piston member (22) has a

having through recess (26), and wherein the first

Rod piston component (14) at least partially within the

through recess (26) is adjustably arranged.

The brake booster device (70) according to any one of claims 1 to 3, wherein the first rod piston member (14) is adjustable in an adjustment direction (54) through a first opening (104) of a master cylinder (20), and wherein the second rod piston member (22) is in the Adjusting direction (54) through a second opening (106) of the

Master cylinder (20) is adjustable.

Brake device for a brake system of a vehicle with a brake booster device (70) according to one of

previous claims; and a master cylinder (20). Brake device according to claim 6, wherein the first piston rod component (14) and the second piston rod component (22) in a first pressure chamber (21, 52) of the master cylinder (20) protrude so that a liquid-fillable first residual volume of the first pressure chamber (21, 52 ) is variable by means of an adjustment of the first rod piston component (14) and / or the second rod piston component (22), and wherein the master brake cylinder (20) has a second pressure chamber (56), into which a floating piston component (58) projects in such a way that Liquid fillable second residual volume of the second pressure chamber (56) by means of an adjustment of the floating piston component (58) is variable.

Braking device according to claim 6 or 7, wherein the first

Rod piston component (14) projects into a first partial pressure chamber (52a) of the master brake cylinder (20) such that a liquid-fillable first partial residual volume of the first partial pressure chamber (52a) can be varied by means of an adjustment of the first rod piston component (14), and wherein the second rod piston component ( 22) in a second partial pressure chamber (52b) of the master cylinder (20), which is delimited by a continuous or interrupted partition (108) from the first partial pressure chamber (52a) projects so that a liquid-fillable second partial residual volume of the second

Partial pressure chamber (52b) by means of adjusting the second

Rod piston component (22) is variable.

Brake system for a vehicle having at least one brake circuit (100a, 100b); and a brake booster device (70) according to any one of claims 1 to 5 and a master cylinder (20); or a brake device according to one of claims 6 to 8.

A manufacturing method of a brake booster device (70) for a brake system of a vehicle, comprising the steps of:

Arranging an amplifier body (10) so that during operation of the brake booster device (70) by means of an actuator device (12), a brake assist force (Fu) is applied to the booster body (10) such that the booster body (10) by means of

Brake assist force (foot) is adjusted; and

Arranging a first rod piston component (14) on a first contact surface (16) of the amplifier body (10) or on a first contact surface (16) of the amplifier body (10) contacting first connection component (18) that in the operation of the

Brake booster device (70) at least partially transmitting the brake assist force (Fu) to the first rod piston member (14) so as to displace the first rod piston member (14); characterized by the step:

Additionally arranging a second rod piston component (22) of a second contact surface (24) of the amplifier body (10) or on a second connection component (40) contacting the second contact surface (24) of the amplifier body (10)

Brake booster device (70) the Bremsunterstützungskraft (Fu) at least partially on the second rod piston component (22) is transferred, that the second rod piston component (22) is adjusted together with the first rod piston component (14).

1 . Method for manufacturing a braking device of a braking system of a vehicle comprising the steps of:

Manufacturing a brake booster device (70) according to

The method of claim 10; and

Arranging the brake booster device (70) on a

Master brake cylinder (20).

12. A manufacturing method for a brake system of a vehicle, comprising the steps of: manufacturing a brake booster device (70) according to the

The method of claim 10 and arranging the

Brake booster device (70) on a master brake cylinder (20); or

Manufacture of a braking device according to the method of claim 1 1; and

Forming at least one brake circuit (100a, 100b) on the

Master brake cylinder (10).