WO2021001078A1 - Dispositif d'amortissement de système de freinage présentant une chambre supplémentaire - Google Patents

Dispositif d'amortissement de système de freinage présentant une chambre supplémentaire Download PDF

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Publication number
WO2021001078A1
WO2021001078A1 PCT/EP2020/061692 EP2020061692W WO2021001078A1 WO 2021001078 A1 WO2021001078 A1 WO 2021001078A1 EP 2020061692 W EP2020061692 W EP 2020061692W WO 2021001078 A1 WO2021001078 A1 WO 2021001078A1
Authority
WO
WIPO (PCT)
Prior art keywords
separating element
space
brake system
damping device
system damping
Prior art date
Application number
PCT/EP2020/061692
Other languages
German (de)
English (en)
Inventor
Edgar Kurz
Wolfgang Schuller
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 WO2021001078A1 publication Critical patent/WO2021001078A1/fr

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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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/04—Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses
    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4068—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system the additional fluid circuit comprising means for attenuating pressure pulsations

Definitions

  • the invention relates to a brake system damping device with a first space to which hydraulic pressure is to be applied and a further space in which a compressible medium is located, and a first separating element for separating the first space from the further space.
  • Brake systems in particular hydraulic brake systems, are used to decelerate a driving speed of vehicles, such as cars and trucks.
  • Various dynamic effects occur during the operation of such brake systems, including pressure fluctuations in the lines and
  • Brake system damping devices also referred to below as dampers, are used at one or more installation locations in the brake system. These dampers include a first space in which hydraulic pressure is to be applied.
  • the room is basically a kind of container.
  • the pressure is basically the result of a force acting on a surface.
  • a force is transmitted hydraulically, that is, via a pressurized fluid.
  • Damper with a separating element which separates the space into a first space in which there is a liquid or a fluid and a further space in which there is a compressible medium, usually in the form of a gas.
  • the volume of a space of a deformable one As is known, the container in which there is a gas decreases when an increased pressure is exerted on this container from the outside. In the same way, by means of the partition element, the volume of the further space also decreases when hydraulic pressure is applied to the first space.
  • the invention is based on the object of providing a device for
  • a brake system damping device is created with a first space to which hydraulic pressure is to be applied, and a further space in which a compressible medium is located, and a first separating element for separating the first space from the further space.
  • the object is achieved in that the further space is formed by means of a hollow cylindrical, thin-walled sleeve which is inserted into a housing that accommodates the first space.
  • the hollow cylindrical and thin-walled sleeve according to the invention is particularly inexpensive to manufacture and, as such, is easy to install. Furthermore, a variety of variants can be produced comparatively easily with such a sleeve, so that there is a high number of variants
  • Brake system damping devices is to be provided.
  • the associated gas springs created with the additional space can be designed variably.
  • sleeves with different sized spaces of the gas volume contained therein can be provided.
  • braking systems with different stiffness of the associated brake pedal, with different response behavior and different NVH behavior can be created easily and inexpensively.
  • Such variants can be specially tailored to customer requirements
  • the sleeve according to the invention is preferably produced as a so-called deep-drawn part by means of a deep-drawing process or as a so-called stamped-pressed part by means of a stamping and pressing process.
  • the installation location of the sleeve according to the invention on the associated housing is largely variable.
  • the sleeve can advantageously protrude from the housing, so that comparatively large volumes can also be made available for the additional space.
  • the sleeve according to the invention generally has a certain rigidity and stability, it is also advantageous if the sleeve is retained in the housing by means of an annular body.
  • the ring body additionally stabilizes the fastening of the sleeve in the housing.
  • Such an annular body is particularly advantageous if the sleeve is retained in the housing by means of a caulking of the housing.
  • the sleeve according to the invention preferably has a radially outer shoulder for supporting on the housing. The shoulder of the sleeve is to be inserted into a hole provided on the housing. The said ring body is then to be placed on the shoulder and then caulked.
  • the sleeve according to the invention is also directly on its outer shoulder by means of a
  • the first separating element is advantageously designed with a membrane, preferably with a rolling membrane.
  • membranes are basically to be understood as sealing elements which, as elastic, movable partitions or partitions, hermetically separate two spaces from one another. Rolling diaphragms in particular are only intended for a one-sided pressure load in the direction of the inside of the loop or a diaphragm head depression. Set volume changes
  • Rolling diaphragm only has a negligibly low inherent rigidity or a low resistance to elastic deformation. Because of their shape, rolling diaphragms are particularly suitable as a separating element for the brake system damping device according to the invention.
  • the first separating element is advantageously made from an elastomer, preferably from ethylene-propylene-diene rubber.
  • Elastomers are dimensionally stable, but elastically deformable plastics. These plastics can therefore deform under tension and pressure, but then find their way back to their original, undeformed shape.
  • elastomers are particularly well suited materials for separating elements in the context of this invention, such as for the rolling diaphragm described above.
  • the elastomer must retain its elasticity and must neither swell nor shrink too much. Therefore, a suitable elastomer must be used for the medium to be sealed.
  • Ethylene-propylene-diene rubber, also called EPDM for short is against
  • Braking medium-resistant elastomer and therefore particularly suitable for use in the brake system damping device according to the invention.
  • the second space is connected to the third space in a medium-conducting manner by means of a passage formed in the second partition element, and a closure element is to be moved with the first partition element by means of which the passage is to be closed as soon as the hydraulic pressure in the first space increases has reached a predefined pressure value, wherein in particular the first separating element is formed in one piece with the closure element.
  • the third space like the second space, contains the compressible medium, which is preferably designed with a gas and particularly preferably with air.
  • the second separator separates the third from the second room, although the two rooms initially remain connected by means of the medium-conducting passage.
  • the passage or the connection is preferably designed with a simple bore and can be closed by means of the closure element of the first separating element.
  • the closure element is preferably simply a surface area on the surface of the first separating element. This closure element only closes the passage when there is sufficient hydraulic pressure in the first space. Specifically, the first separating element is deformed to such an extent, in particular from the predefined pressure value, that it then rests against the second separating element. The second separating element thus preferably forms a stop for the closure element.
  • the only remaining pressure value is the volume of the medium in the second room. This is due to the first deformed in the direction of the second separating element
  • the damper according to the invention thus only has a lower elasticity and damping effect, because the second space can hardly take up any volume.
  • the advantageous effect here is that a pedal travel or the travel of a brake pedal of the brake system is no longer significantly lengthened when actuated by a vehicle driver.
  • the damping effect is justifiable because the pressure range relevant for damping is below the predefined pressure value.
  • the pressure value is therefore preferably selected or predefined in such a way that it represents the upper limit value of a pressure range relevant for the damping.
  • the respective volumes of the second and third space are preferably based on the relevant pressure range and the desired elasticity or Adjusted damping effect of the damper.
  • the damper combines the great elasticity of the large volume of medium in the pressure area relevant for damping with a limitation of the volume that can be accommodated by the first space above this pressure area. In other words, there is no longer any direct dependency between the displaced volume of braking medium and that used for damping
  • Another advantage of such a design is that the pressure in the closed third space is significantly lower than the pressure in a second space without a passage to another space, that is, in the prior art. This reduces undesirable effects. On the one hand, if the pressure is lower, the permeation through the first is reduced
  • the temperature of the medium is not so high at lower pressure, which delays material aging of the first separating element.
  • the first separating element and the second separating element are advantageously preassembled to form an assembly in which the first and second separating element extend along an axis and the first separating element is covered at least in sections radially on the outside by means of an envelope surface.
  • the enveloping surface is designed in particular to be rigid or rigid, while the first separating element is flexible or elastic.
  • the envelope surface is particularly advantageously formed by means of the sleeve according to the invention.
  • a sliding surface is formed on the outside of the first separating element, along which the assembly that is formed can advantageously be introduced into an associated housing and installed.
  • the feeding and assembly of the assembly formed according to the invention can be automated in this way and then be carried out by machine. Using the listed technical advantages you can also
  • Brake system damping device are equipped, are significantly increased.
  • the second separating element is preferably supported by the sleeve according to the invention, by means of which the third space is also delimited.
  • the second separating element is advantageously held on or in the sleeve by means of a press fit. The sleeve is then in the manner of a lid as a closure on
  • Brake system damping device is provided and also allows flexible access to the housing. This may also be a simple one
  • the first or second separating element can be exchanged.
  • brake system damping devices that previously only used a space between their cover and an elastic separating element for damping can be retrofitted with the second separating element.
  • sleeve according to the invention is formed and the second separating element is held on the sleeve by means of a press fit, a connection between the sleeve and the second separating element that can be advantageously produced in terms of assembly is created.
  • the second separating element preferably extends along an axis and the interference fit with the sleeve is formed on the second separating element radially on the outside.
  • a press fit has a comparatively large surface and thus a large sealing area.
  • an advantageous material combination of a sleeve made of metal and a second separating element made of plastic can be selected.
  • the first separating element has an annular sealing bead with which it rests in a sealing manner on the second separating element and in particular the sleeve supporting the second separating element.
  • the sealing bead of this type then forms a central sealing element, by means of which both the first and the second and third spaces are advantageously delimited from one another.
  • Such a solution is also particularly space-saving, since three sealing points are implemented with only one sealing element.
  • the first separating element is designed in one piece with the closure element.
  • One piece means that two elements, here the first separator and the
  • Closure element are molded in one piece or as a part. This has the advantage of simple assembly and inexpensive manufacture.
  • the predefined pressure value is advantageously predefined with a value between 0 and 30 bar, preferably between the range 3 and 10 bar, and particularly preferably with 5 bar. If a brake system applies a pressure of around 60 bar to an associated wheel of a vehicle, this will certainly cause the wheel to lock. For the vibration resp.
  • pulsation damping in brake systems is only relevant for a significantly smaller, limited pressure range.
  • a pressure value of about 5 bar When a pressure value of about 5 bar is reached, the disruptive oscillation or pulsation is already sufficiently damped. It is therefore particularly advantageous to set the pressure value at this value.
  • the third space is subdivided into several sub-spaces, each of which is connected to the second space in a medium-conducting manner by means of a passage.
  • the multiple sub-rooms allow greater flexibility compared to using only a single third room.
  • the passages to the individual sub-spaces are preferably closed one after the other by means of the first separating element, whereby the damping effect is gradually reduced, and not completely and suddenly at the one predefined pressure value.
  • the compressible medium which is contained in the second and third space, is preferably designed as a gas and particularly preferably as air. Air is readily available, can be used at no cost, and is compressible, and is therefore excellent for use in the invention
  • the brake system damper is preferred for a
  • a vehicle dynamics control or electronic stability program also known as ESP, is an electronically controlled driver assistance system for a motor vehicle, which counteracts the motor vehicle breaking away by targeted braking of individual wheels.
  • An external power brake system or an external power brake system is operated by means of externally generated power.
  • an electro-hydraulically actuated brake is an external power brake in which the actuation energy comes from a hydraulic pressure accumulator that is charged by a pump.
  • the brake system damping device also has a rib structure supporting the second separating element and penetrating the third space, in particular with a
  • the rib structure is preferably on the second separating element on the first
  • Separating element outer wall arranged to support the second separating element against a pressure acting on the separating element inner wall.
  • the partition element outer wall thus forms a first end side of the rib structure.
  • the opposite or second end side of the rib structure is formed by the structure end side, which is preferably designed to be planar.
  • the structural rib is a load-bearing element of the supporting rib structure and extends from the partition element outer wall to the structural end face. Due to the supporting function of the rib structure, the braking system damper is inherently more stable. In addition, the material of the second separating element is less stressed, which has a positive effect on its service life.
  • the rib structure is preferably designed with two or more structural ribs in order to give the rib structure further stability.
  • the rib structure is advantageously designed with a vertical circular hollow cylinder which attaches centrally to the separating element outer wall and extends from this to the second end of the rib structure or the structure end side.
  • a cylinder cavity formed in the circular hollow cylinder is preferably connected in a medium-conducting manner to the passage in the second separating element. At this point it should be explicitly pointed out that the passage in the second separating element may in no case be closed by the rib structure.
  • the structural ribs attach to the outside of the circular hollow cylinder and at these points - referred to below as attachment points - have an extension or rib depth which corresponds to the length of the circular hollow cylinder. From these attachment points, the structural ribs preferably extend radially or
  • each structural rib varies according to the shape of the adjacent end sides of the rib structure. As already mentioned, the structure end side is preferably planar and therefore does not cause any variation in the rib depth.
  • the separating element outer wall is mostly uneven or three-dimensional. The respective rib depth must then vary or be designed according to the separating element outer wall. This further improves the stability of the rib structure.
  • the rib structure preferably forms at least two structural sub-spaces which are connected to one another in a medium-conducting manner by means of at least one connecting channel.
  • the structural sub-spaces are each formed by means of at least one structural rib, the separating element outer wall and a further component surrounding the third space. As already mentioned above, this component is preferably the cover.
  • the structure sub-spaces are preferably arranged in such a way that a supporting rib structure is created or the supporting effect of the rib structure is further reinforced.
  • Connection channel is an opening in an element, preferably one
  • Structural rib that separates the two structural spaces.
  • the compressible medium passes from the second space into each of the structural sub-spaces of the divided third space and thus develops maximum damping for the brake system damping device.
  • a lower degree of damping can also be set by sealing off individual structural sub-spaces or closing individual connecting channels - if desired.
  • the rib structure is designed with the circular hollow cylinder, as described above for an advantageous embodiment, leads to each of the structural sub-spaces a connecting channel preferably from this cylinder cavity. In this way, the medium can spread evenly and thus load all areas of the rib structure equally.
  • the compressible medium is preferably designed as a gas, and particularly preferably as air. Therefore, in the following, the third space is also referred to as the second air chamber, the structural sub-spaces are also referred to as air sub-chambers and the medium volume is also referred to as the air volume. Accordingly, the second air chamber was connected by several
  • Brake system damper is adjustable.
  • the proposed construction offers design options for connecting the air chambers by means of the connecting channels.
  • the second separating element is not only provided for separating the second space from the third space or from the second air chamber, but preferably also fulfills a holding or carrying function for the first separating element.
  • the first separating element is advantageously designed with a membrane. Therefore, the second separating element is also referred to below as a membrane support component.
  • the rib structure creates a stable membrane support component, which also offers several design options for the third room or its division.
  • the described shape of the membrane support component allows the use of cost-effective molded components that can be produced, for example, using technologies such as injection molding.
  • the rib structure has a rib shell which surrounds the rib structure and is designed in particular with an outer shell wall and an inner shell wall.
  • the rib jacket is a type of hollow cylinder which encloses the rib structure and extends from the separating element outer wall to the structure end side.
  • the outer wall of the jacket lies against the one surrounding the third room
  • the inner wall of the jacket forms an area up to which the Extending structural ribs. With the rib jacket, the rib structure is made more compact and even more stable.
  • the rib structure and the rib jacket are preferably designed in one piece, preferably in one piece with the second separating element.
  • One-piece means, as already mentioned, that several elements, here the rib structure with the rib jacket, and preferably also with the second separating element, are formed in one piece or as one part. The advantage here is simple assembly and inexpensive manufacture.
  • the rib jacket is advantageously designed with at least one jacket slot, the jacket slot preferably extending from the structure end side in the direction of the separating element outer wall and being intended to open the rib jacket to one of the structural parts.
  • the jacket slots thus form recesses in the otherwise completely closed rib jacket.
  • Recesses or free spaces increase the volume that can be absorbed by the compressible medium, thereby reducing the degree of damping of the
  • Brake system damper is increased. In addition, material is saved.
  • the rib jacket is preferably designed with at least one locking element, the locking element preferably protruding from the jacket outer wall and preferably being arranged on the structure end side.
  • the latching element is a knob or hook which is provided to latch into a recess within the component surrounding the outer wall of the jacket.
  • Brake system damping device thereby gains additional stability.
  • the locking element is arranged adjacent to two jacket slots.
  • the two jacket slots each lead directly along the latching element, whereby a flexible or push-in support device is formed for the latching element.
  • the second separating element can thus be more easily installed or guided to a locking point.
  • the second Separating element is made from a material that is very difficult to deform, its assembly is significantly facilitated by means of the carrier device formed.
  • the brake system damping device advantageously has a component comprising the rib shell with an inner wall of the component, in which the inner wall of the component is designed with a recess encircling the outer wall of the shell, the recess being provided for engaging the latching element.
  • the component is preferably the cover or the housing of the
  • Brake system damper The component inner wall or one on the
  • Membrane support component and the surrounding component preferably the cover.
  • the recess is preferably the recess described above. Since the recess in the surrounding component is circumferential, but the at least one locking element, on the other hand, is designed individually, this form-fitting connection is flexible and is position-independent with respect to the locking element.
  • the structure end side is arranged adjacent to the component inner wall in order to be supported on it.
  • the inner wall of the component increases the support effect of the rib structure and considerably reduces the surface pressure on the inner wall of the component, preferably the cover.
  • very strong materials such as preferably made of machined metal
  • softer and / or more cost-effective materials can also be used for the membrane support component or the second separating element.
  • inexpensive molded components can also be used as membrane support components.
  • the second separating element is manufactured by means of injection molding, preferably by means of powder injection molding and particularly preferably by means of metal powder injection molding.
  • injection molding also called
  • Injection molding or injection molding process called is a manufacturing process, more precisely a primary molding process for the manufacture of components.
  • the respective material is liquefied with an injection molding machine and injected into a mold under pressure.
  • Powder injection molding also known as the PI M process - English for Powder Injection Molding - is a primary molding process for the production of Components made of metal or ceramic.
  • metal powder injection molding also MIM process - English for Metal Injection Molding - is a primary molding process for the production of metal components in particular.
  • FIG. 2 shows the brake system damping device in FIG. 1 at a first applied hydraulic pressure
  • FIG. 3 shows the brake system damping device in FIG. 1 with a second hydraulic pressure applied
  • FIG. 6 shows a first embodiment of a brake system damping device according to the invention
  • FIG. 7 shows a second embodiment of a brake system damping device according to the invention.
  • FIG. 8 shows a third embodiment of a brake system damping device according to the invention.
  • FIG. 1 shows a brake system damping device 10 with a housing 12 and a cover 14.
  • a feed line 16 is arranged in the housing 12, in which no hydraulic pressure is present, shown by a crossed arrow 18.
  • the feed line 16 opens into a first space 20, to which a first separating element 22, here a rolling diaphragm, connects. Seen from the first space 20 behind the first separating element 22, there is a second space 24, to which a second separating element 26 is connected, a third space 28 being located behind the second separating element 26 in the viewing direction.
  • These rooms 20, 24, 28 and partition elements 22, 26 can be seen in detail
  • the first room 20 is surrounded by a
  • A is formed centrally in the separating element 22 and in one piece therewith
  • Closing element 34 is arranged, from which the separating element 22 extends further outward to a membrane fold 36.
  • a membrane fold depression 38 is located within the membrane fold 36 or surrounded by it
  • the separating element 22 extends as far as a diaphragm collar 40 which engages around a coupling socket 42 of the housing 12.
  • the separating element 22, designed as a rolling diaphragm, lies with part of its separating element inner wall 32 in a sealing manner against the housing inner wall 30, and faces the second space 24 with a first separating element outer wall 44.
  • the second room 24 is surrounded by the first
  • the second separating element 26 extends with a membrane holding device 48 into the membrane fold depression 38.
  • a passage 50 Arranged in the center of the second separating element 26 is a passage 50 which connects the second space 24 to the third space 28. The passage 50 leads through the second
  • the third space 28 is surrounded by the second separating element outer wall 52 and an inner cover wall 54 of the cover 14.
  • the separating element 22 which is made from an elastomer, is here essentially in its basic shape. It rests against the housing inner wall 30 in such a way that the first space 20 is hermetically sealed from the second space 24, with a gas, here specifically air, being located in the second space 24. This gas is also located in the third space 28, which is connected to the second space 24 by means of the passage 50 connected is.
  • These two spaces 24, 28 thus form a common gas volume available for damping. Due to the greater elasticity of this gas volume, a better damping effect is achieved when braking or when applying hydraulic pressure to the first space 20.
  • the separating element 22 and the second separating element 26 are in contact with one another without gaps or over their entire surface, so that the second space 24 disappears completely or no longer has any volume. In this case, the travel of the brake pedal is no longer extended.
  • FIG. 2 shows the brake system damping device 10 from FIG. 1, but in a state in which a first hydraulic pressure is applied to the first space 20, shown by means of an arrow 56 in the area of the supply line 16.
  • closure element 34 rests against the second partition element inner wall 46 of the second partition element 26 and closes the passage 50 to the third space 28. Thus, only the remaining volume in the second space 24 can be used for further damping.
  • Membrane holding device 48 The effects on the damping and the braking process have already been explained in detail in the description of FIG. 1 and are therefore not described again here.
  • FIG. 3 the brake system damping device 10 from FIG. 1 is shown, but in a state in which a second hydraulic pressure is applied to the first space 20, shown by means of an arrow 58 in the area of the supply line 16.
  • the closing element 34 rests against the second separating element inner wall 46 of the second separating element 26 and closes the passage 50 to the third space 28.
  • the separating element 22 and the second separating element 26 are completely in contact with one another so that the second space 24 does not Has more volume.
  • FIG. 4 shows a diagram for the dependency between a pressure 60 and a volume uptake 62 in such brake system damping devices.
  • the pressure 60 is shown on the x-axis and the volume uptake 62 on the y-axis.
  • a first characteristic curve 64 and a second characteristic curve 66 extend from a coordinate origin of the diagram.
  • the diagram shows a vertical dashed line 68 crossing the x-axis and a horizontal dashed line 70 crossing the y-axis.
  • the first characteristic curve 64 shows the relationship between pressure and
  • volume uptake for a brake system damping device with a small volume of medium available for damping For this characteristic curve 64, the volume of the second space 24 in FIG. 1 is assumed here in a simplified manner.
  • the second characteristic curve 66 which extends above the first characteristic curve 64, shows the dependence of pressure and volume uptake for a
  • Predefined pressure value 68 is shown, which forms the upper limit of a pressure range that is relevant for the pulsation damping in such brake systems. This relevant printing area thus extends from the origin of the coordinates to the dashed line.
  • Volume stop 70 for the brake system damping device 10 according to the invention is shown. This volume stop is approximately at the volume of the second space 24 in FIG. 1.
  • the brake system damping device 10 is matched to the relevant pressure range and the desired elasticity or damping effect in this pressure range.
  • the dashed lines 68, 70 cross with the characteristic curve 66 at one point.
  • FIG. 5 shows a brake system damping device 10 which differs from that in FIG. 1 only in the area in which the first separating element 22, designed as a rolling membrane, faces with the first separating element outer wall 44.
  • the separating element 22 itself and the area, which the separating element 22 with facing the first partition element inner wall 32 correspond completely to FIG. 1 and are not described again here.
  • the main difference to the brake system damping device 10 in Fig. 1 is that instead of the third space 28 and the associated passage 50 in Fig.
  • the brake system damping device 10 here in FIG. 5 has a first subchamber 72 with a passage 74 and a second subchamber 76 with a second passage 78.
  • the two sub-spaces 72, 76 are separated by means of a partition 80.
  • Another difference from FIG. 1 is that here in FIG. 5 the second separating element 26 extends up to the housing inner wall 30 and separates the cover 14 therefrom.
  • the second space 24 is also surrounded by the first separating element outer wall 44 and a second separating element inner wall 46 of the second separating element 26.
  • the second separating element 26 also extends here with a
  • the subspaces 72, 76 next to the separating wall 80 are surrounded by the second separating element outer wall 52 and a lid inner wall 54 of the lid 14.
  • the mode of operation here is similar to that of the brake system damping device 10 in FIG. 1. If hydraulic pressure is applied in the first space 20, the separating element 22 is also deformed here in such a way that the gas volume in the second space 24 is reduced.
  • the closure element 34 moves into the second space 24 and, from a certain hydraulic pressure, which ideally corresponds to the upper limit of the relevant pressure range, lies against the second separating element 26 and closes the passages 74, 78 to the sub-spaces 72, 76.
  • the separating element 22 which is designed as a rolling membrane, moves again in its
  • Passages 74, 78 are then opened again and the sub-spaces 72, 76 are again connected to the second space 24.
  • 6 to 8 are exemplary embodiments of an inventive
  • Brake system damping device 10 is illustrated, in which the second separating element 26 is also designed with a passage 50 and sub-spaces 72 and 76 by means of at least one partition 80.
  • the second separating element 26 is also designed on its jacket outer wall 82 of the third space 28 in such a way that it forms a press fit 84 there with a cover 14.
  • the cover 14 is designed as a hollow cylindrical, thin-walled sleeve 86 which is produced from sheet metal by means of a deep-drawing process.
  • the first separating element 22 and the second separating element 26 as well as the sleeve 86 must also be preassembled to form an assembly which is to be inserted as a unit in the space 20 on the housing inner wall 30 of the housing 12.
  • FIG. 6 shows the sleeve 86 on the left and the second separating element 26 preassembled thereon by means of the press fit 84 in the middle. Furthermore, FIG. 6 shows the first separating element 22 preassembled on the second separating element 26 and on the sleeve 86 on the right the first separating element 22 completely enclose the second separating element 26. The two spaces 24 and 28 formed in this way can also be seen in FIG. 6
  • Separating element 22 can be seen its membrane collar 40 and a sealing bead 88 with which the first separating element 22 seals radially on the inside on the second separating element 26, radially on the outside on the housing 12 and in particular axially on the sleeve 86.
  • Fig. 6 shows the hat-shaped sleeve 86, which on her from the second
  • Separating element 26 has a side facing away from a cylindrical hat extension 90 of reduced diameter.
  • the sleeve 86 also has an im
  • Shell wall 92 and one based on FIG. 6 to the right thereof in
  • the sleeve 86 is placed against a step from the hole in the housing 12 that forms the space 20.
  • the shoulder 94 is supported on the outside by the sleeve 86 by means of an annular body 96 and is retained in the housing 12.
  • the ring body 96 is fixed in place in the housing 12 by means of a caulking 98.
  • FIG. 7 shows an exemplary embodiment of a brake system damping device 10, in the case of whose sleeve 86 the hat extension 90 has been omitted. In this way, a third space 28 of smaller volume is created within the sleeve 86 modified in this way.
  • Fig. 8 finally illustrates how the sleeve 86 by means of a
  • Caulking 98 of the housing 12 is held back in a stationary manner directly in the housing 12 without an annular body having to be used for this purpose.
  • 8 also shows an extension provided on the sleeve 86 in the form of a cylindrical envelope surface 100 extending over the sealing bead 88, by means of which the first separating element 22 is covered on its sealing bead 88 on the outside.
  • Housing inner wall 30 of the space 20 are used sealingly.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

L'invention concerne un dispositif d'amortissement (10) de système de freinage, présentant une première chambre (20), dans laquelle une pression hydraulique est destinée à être appliquée, une chambre supplémentaire (28) dans laquelle se trouve un milieu compressible et un premier élément de séparation (22) pour séparer la première chambre (20) de la chambre supplémentaire (28). Selon l'invention, la chambre supplémentaire (28) est formée au moyen d'un manchon (86) cylindrique creux à parois minces qui est placé dans un boîtier (12) recevant la première chambre (20).
PCT/EP2020/061692 2019-07-04 2020-04-28 Dispositif d'amortissement de système de freinage présentant une chambre supplémentaire WO2021001078A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019209892.4 2019-07-04
DE102019209892.4A DE102019209892A1 (de) 2019-07-04 2019-07-04 Bremssystemdämpfvorrichtung mit einem weiteren Raum

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WO2021001078A1 true WO2021001078A1 (fr) 2021-01-07

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021202290A1 (de) 2021-03-09 2022-09-15 Continental Teves Ag & Co. Ohg Pulsationsdämpfer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538615A1 (de) * 1995-10-17 1997-04-24 Teves Gmbh Alfred Hydraulische Bremsanlage mit Pulsationsdämpfer
WO2001081812A1 (fr) * 2000-04-20 2001-11-01 Continental Teves Ag & Co. Ohg Amortisseur d'oscillations
US20140000740A1 (en) * 2012-06-29 2014-01-02 Kelsey-Hayes Company Damping Element for a Motor Vehicle Hydraulic System
DE102017213322A1 (de) * 2017-08-02 2019-02-07 Robert Bosch Gmbh Dämpfereinrichtung eines Hydraulikaggregats einer Fahrzeugbremseinrichtung mit einer Dämpferkammer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538615A1 (de) * 1995-10-17 1997-04-24 Teves Gmbh Alfred Hydraulische Bremsanlage mit Pulsationsdämpfer
WO2001081812A1 (fr) * 2000-04-20 2001-11-01 Continental Teves Ag & Co. Ohg Amortisseur d'oscillations
US20140000740A1 (en) * 2012-06-29 2014-01-02 Kelsey-Hayes Company Damping Element for a Motor Vehicle Hydraulic System
DE102017213322A1 (de) * 2017-08-02 2019-02-07 Robert Bosch Gmbh Dämpfereinrichtung eines Hydraulikaggregats einer Fahrzeugbremseinrichtung mit einer Dämpferkammer

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