Brake system damping device having passages in a separation element - Patents.com

Abstract

To provide a brake system damping device which can be manufactured at low cost and achieve a long service life.SOLUTION: The invention relates to a brake system damping device 10 including: a first space 20 to which hydraulic pressure should be applied; a second space 24 containing a compressible medium; and a first separating element 22 for separating the first space from the second space. The brake system damping device includes: a third space 28 containing a compressible medium; and a second separating element 26 for separating the second space from the third space. The second space is connected in medium-conducting fashion to the third space by a passage 50 formed in the second separating element. A closure element 34 can be moved with the first separating element so as to close the passage in a movement direction by the closure element as soon as the hydraulic pressure has reached a predefined pressure value in the first space. According to the invention, a plug-type element is arranged in the passage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The invention relates to a brake system damping device comprising a first space to which a hydraulic pressure is to be applied and a second space containing a compressible medium, a first separating element being used to separate the first space from the second space, the brake system damping device further comprising a third space containing a compressible medium and a second separating element separating the second space from the third space, the second space being connected in a medium-conducting manner to the third space by a passage formed in the second separating element, a closing element being movable together with the first separating element, the passage being closed by the closing element in the direction of movement as soon as the hydraulic pressure reaches a predetermined pressure value in the first space. [Background technology]

[0002] Brake systems, in particular hydraulic brake systems, are used to slow down the travelling speed of vehicles, for example passenger cars and freight vehicles. During the operation of such brake systems, various dynamic effects occur, in particular pressure fluctuations in the lines and spaces present, which lead to vibrations or pulsations and thus to undesirable noise and vibrations. In order to minimize such vibrations or to obtain a damping effect in the event of such vibrations, brake system damping devices, also referred to below as dampers, are attached to one or more mounting locations of the brake system. Such dampers comprise a first space to which hydraulic pressure should be applied. This space is essentially a kind of container. The pressure is essentially the result of forces acting on a surface. In dampers, the forces are transmitted hydraulically, i.e. via a liquid under pressure.

[0003] Dampers are known which comprise a separating element which separates a space into a first space containing a liquid or fluid and a second space containing a compressible medium, usually in the form of a gas. The volume of the space of a deformable container containing a gas is known to decrease when a high pressure is applied to said container from the outside. In exactly the same way, the volume of the second space is also decreased by the separating element when a liquid pressure is applied to the first space.

[0004] If this pressure is reduced again, the gas and therefore the volume of the second space will increase again accordingly. The second space then acts like an air spring, also called a gas spring. The degree of softness or hardness of the damping of a gas spring depends on the gas volume in the second space. The larger the gas volume, the softer the damping.

[0005] During the braking process, the vehicle driver depresses the brake pedal, which then undergoes a pedal stroke. This pedal stroke is directly related to the gas volume in the second space involved. The larger the gas volume, the longer the pedal stroke. The positive effect of soft damping is therefore counterbalanced by the negative effect of a long pedal stroke length.

[0006] The third space, like the second space, contains a compressible medium, in particular consisting of a gas, particularly preferably air. The second separating element separates the third space from the second space, but initially the two spaces remain connected by a passage through which the medium can flow. The passage or connection is in particular formed by a simple hole and can be closed by a closing element of the first separating element. In particular, the closing element is merely a surface area of ​​the surface of the first separating element. This closing element only closes the passage when the hydraulic pressure in the first space is large enough to close it. In particular, the first separating element is deformed, in particular from a predetermined pressure value, until it comes to rest against the second separating element. The second separating element thus forms in particular a stop for the closing element.

[0007] The third space is then separated from the second space due to the closure of the passage and is therefore unavailable for the remaining damper. Only a medium volume in the second space is available to obtain further damping action beyond the predetermined pressure value. This medium volume is relatively small due to the deformation of the first separating element in the direction of the second separating element. The damper according to the invention therefore only has a relatively small elastic and damping action remaining, since the second space can take up very little volume. The effect in this case is that the pedal stroke or stroke of the brake pedal of the brake system is not significantly increased when actuated by the vehicle driver.

[0008] On the contrary, when the passage is closed, the first separating element can completely abut against the inner wall of the second space, including the side of the second separating element facing the second space, so that the second space is completely eliminated or its volume is eliminated. In that case, the pedal stroke is not lengthened at all beyond the predetermined pressure value. The damping effect which is likewise eliminated is in a range that is not problematic since the pressure range relevant for damping is below the predetermined pressure value.

[0009] That is, the pressure value is selected or preset in particular to be the upper limit of the pressure range relevant for damping. The respective volumes of the second and third spaces are then preferably adapted to the relevant pressure range and the desired elasticity or damping effect of the damper. In this advantageous manner, the damper combines a high elasticity of a large medium volume in the pressure range relevant for damping with a limitation of the volume that can be taken up by the first space above this pressure range. In other words, there is no direct dependency between the medium volume used for damping and the volume of brake medium displaced. The damper therefore exhibits good damping properties at short pedal strokes.

[0010] Another advantage is that the pressure in the closed third space is much lower than in the second space without a passage to another space, i.e. according to the prior art, thereby reducing undesirable effects: permeation of the first separating element at lower pressures is reduced, while the medium temperature at lower pressures is not so high, thereby slowing down material degradation of the first separating element. Summary of the Invention [Problem to be solved by the invention]

[0011] The invention is based on the object of designing a device for vibration damping in a brake system of the above-mentioned kind in a manner that is cost-effective to produce and at the same time has a long service life. [Means for solving the problem]

[0012] According to the invention, a brake system damping device is provided, which comprises a first space to which hydraulic pressure is to be applied, a second space containing a compressible medium, and a first separating element separating the first space from the second space. The brake system damping device according to the invention further comprises a third space containing a compressible medium and a second separating element separating the second space from the third space, the second space being connected in a media-conducting manner to the third space by a passage formed in the second separating element, the closing element being movable together with the first separating element, the passage being closed in the direction of movement by the closing element as soon as the hydraulic pressure reaches a predetermined pressure value in the first space. According to the invention, a plug element is arranged in the passage. Effect of the Invention

[0013] By using a plug element according to the invention, it is possible to provide in the associated passage a support against which the first separating element can be supported when moving in the direction of the second separating element, thereby preventing the second separating element from being damaged by friction or bending effects at or within the passage.

[0014] In this case, in particular, the cross section of the passage can be at least partially covered by the plug element according to the invention. In this case, according to one advantageous development, it is particularly advantageous if the plug element is formed by a convex cap on the side facing the second space. The convex, i.e. outwardly curved cap further contributes to the first separating element being able to rest on the cap in a rolling motion and to be lifted off. At the same time, this movement prevents the first separating element from being sucked thereon due to negative pressure. The cap provides a spike-shaped resting surface for the first separating element, on which the first separating element can be supported without blocking the associated at least one passage opening. At the same time, the convex shape of the cap contributes to the first separating element being able to rest on the cap without a step or a bent edge and therefore without bending.

[0015] Corresponding to the above mentioned advantages, it is furthermore advantageous if the plug element is mushroom-shaped and with a mushroom head on the side of the plug element facing towards the second space, whereby a mushroom head is understood in this context to be an element whose diameter transverse to the longitudinal axis of the plug element is larger than the associated mushroom stem and therefore in particular larger than the diameter of the passage into which this mushroom stem is to be inserted.

[0016] In a further development of the invention, the plug element is formed with at least one passage opening on the side facing the second space, the cross section of which is oriented substantially in the direction of movement of the closing element. Such a passage opening does not extend transversely to the direction of movement of the closing element closing the passage opening, as is usually the case, but substantially in this direction. The cross section therefore extends in the direction in which the closing element also moves. This achieves that the closing element does not abut directly against the edge of the passage opening, but can fit into the passage opening itself. The closing element therefore cannot adhere to the passage opening itself or get stuck in the passage opening. Instead, the closing element can rather cover the entire passage opening or a large area and abut against an abutment area far away from the passage opening. Thus, it is reliably prevented that the closing element becomes pinched or stuck in the passage opening and the associated passage, and at the same time high operational reliability is achieved at very low costs.

[0017] At least one passage opening is in particular formed as a slot. A slot is understood here to mean an opening surface with a relatively long slot length (in particular more than 1 millimeter) and a relatively small slot width (in particular less than 1 millimeter). In the case of such a slot, the slot width extends in particular in the direction of movement of the closing element. Such a passage opening can therefore be opened or closed with a relatively small movement of the closing element. At the same time, due to the relatively long slot length, a relatively large cross section is available with a low flow resistance.

[0018] In particular, two to four, in particular three, passage openings are provided. Advantageously, these passage openings are distributed around the circumference of the cylinder. A plurality of, in particular an odd number of, passage openings provides the passage with a less irregular flow behavior and thus a flow with less pressure impulses and pressure fluctuations in the passage according to the invention.

[0019] Advantageously, the plug element according to the invention is furthermore formed with at least one locking hook on its side facing towards the third space, which non-detachably holds the plug element in the passage after said locking hook has been inserted into the passage during assembly.

[0020] In an advantageous embodiment, the second separating element is made of metal and the plug element is made of plastic. This allows a particularly cost-effective production of the two parts. At the same time, the two parts can be optimally matched to their functions, i.e. support of the first separating element for the second separating element and protection of the passage of the second separating element from damage for the plug element. Particularly preferably, the plug element is produced by injection molding. Injection molding, also called injection molding or injection molding process, is a manufacturing method, more precisely a molding method, for producing components. In this case, the respective plastic is liquefied in an injection molding machine and injected under pressure into a mold.

[0021] In a next advantageous development of the invention, the first separating element is formed with a diaphragm, in particular a rolling diaphragm. The diaphragm is to be understood here as essentially an elastic and movable separating wall or sealing element which separates two spaces from one another in a hermetic manner. In particular, the rolling diaphragm is intended to be pressure-loaded on one side only, in the direction of the inside of the loop or the diaphragm head recess. Volume changes provide the rolling diaphragm with a negligible inherent stiffness or a low resistance to elastic deformation. Due to its shape, the rolling diaphragm is therefore particularly well suited as a separating element for the brake system damping device according to the invention.

[0022] It is advantageous if the first separating element is made of an elastomer, in particular of ethylene propylene diene rubber. Elastomers are shape-fixed but elastically deformable plastics. Such plastics can therefore be deformed under tensile and compressive loads, but then return to their original, undeformed shape. Elastomers are therefore particularly well-suited materials for separating elements in the sense of the present invention, for example the above-mentioned rolling diaphragms.

[0023] The elastomer must maintain its elasticity and not be allowed to expand or contract too much. Therefore, an elastomer suitable for the medium to be sealed must be used. Ethylene propylene diene rubber, or EPDM for short, is an elastomer that is resistant to braking media and is therefore particularly suitable for use in the brake system damping device according to the present invention.

[0024] In addition, it is advantageous according to the invention that the predetermined pressure value is predetermined at a value between 0 and 30 bar, in particular between 3 and 10 bar, particularly preferably at 5 bar. If the brake system applies a pressure of about 60 bar to the relevant wheel of the vehicle, this ensures that the wheel stops. However, for vibration or pulsation damping in the brake system, only a much smaller, limited pressure range is relevant. When the pressure value reaches about 5 bar, the disruptive vibrations or pulsations are already sufficiently damped. It is therefore particularly advantageous to set the pressure value to this value.

[0025] Furthermore, the second separating element is provided with, in particular, a number of passages which allow a more rapid redistribution of the medium from the second space to the third space during the braking process, so that the elasticity of the entire medium volume can be better exploited.

[0026] Additionally, other embodiments would be advantageous that further enhance the efficiency of the brake system damping device or that complement it with alternative embodiments.

[0027] In another advantageous embodiment, the third space is divided into several partial spaces, each of which is connected in a medium-conducting manner to the second space by a passage. Several partial spaces allow greater flexibility than using only one third space. The passages to the individual partial spaces are thus closed one after the other, in particular by the first separating element, so that the damping effect is gradually reduced and does not drop completely and suddenly at a predefined pressure value. Furthermore, by closing and reopening the passages, a variable number of partial spaces and therefore a variable medium volume can be used. This facilitates the adjustment of the damper to the relevant pressure range and the desired elasticity.

[0028] The compressible medium contained in the second and third spaces is therefore preferably formed as a gas, particularly preferably as air, which is readily available, inexpensive to use and compressible and is therefore highly suitable for use in the brake system damping device according to the invention.

[0029] Alternatively and advantageously, the medium volume or the second and third spaces are produced or provided by combining a number of turned, cold forged or deep drawn parts. Turned parts are parts with a circular cross section, cold forged parts are closed parts and deep drawn parts are vehicle body parts, i.e. all these parts are easily available in the automotive industry and find new uses thanks to the present invention.

[0030] Furthermore, the brake system damping device is preferably intended for use in driving dynamics control and / or manual braking systems. Electronic stability programs, also called driving dynamics control or ESP, are electronically controlled driver assistance systems for motor vehicles that keep the vehicle on course by braking individual wheels in a targeted manner. Manual braking systems or manual braking equipment are operated by a force generated manually. For example, electrohydraulically operated brakes are manual brakes, in which case the operating energy is delivered from a hydraulic reservoir that is accumulated by a pump.

[0031] Hereinafter, an embodiment of the solution according to the present invention will be described in detail with reference to the accompanying schematic drawings. [Brief description of the drawings]

[0032] [Figure 1] 1 is a diagram of a first example of a brake system damping device on which the present invention is based; [Diagram 2] 2 is a diagram of the brake system damping device of FIG. 1 when a first hydraulic pressure is applied; [Diagram 3] 2 is a diagram of the brake system damping device of FIG. 1 when a second hydraulic pressure is applied; [Figure 4] 2 is a graph including characteristic lines for the dependence of pressure on volumetric uptake in a brake system damping device. [Diagram 5] FIG. 13 is a diagram of a second example of a brake system damping device. [Figure 6] FIG. 6 is a view of section VI according to FIG. 1 with a plug element according to the invention. [Figure 7] FIG. 7 is an enlarged perspective view of the plug element according to FIG. 6; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] In Fig. 1 a brake system damping device 10 is shown with a housing 12 and a lid 14. A supply line 16, here free of hydraulic pressure, is arranged in the housing 12, indicated by a crossed arrow 18. The supply line 16 leads into a first space 20, which is followed by a first separating element 22, here a rolling diaphragm. Behind the first separating element 22 as viewed from the first space 20 there is a second space 24, which is followed by a second separating element 26, and behind the second separating element 26 in the viewing direction there is a third space 28.

[0034] In detail, these spaces 20, 24, 28 and the separating elements 22, 26 look as follows: The first space 20 is surrounded by a housing inner wall 30 and a first separating element inner wall 32 of the first separating element 22, hereinafter referred to as a rolling diaphragm. Arranged in the middle of the separating element 22 and formed in one piece with it is a closing element 34, from which the separating element 22 extends further outwards towards a diaphragm fold 36. Diaphragm fold recesses 38 are in the diaphragm fold 36 or are surrounded by it. The separating element 22 extends beyond the diaphragm fold 36 to a diaphragm collar 40, which encloses a coupling frame 42 of the housing 12. A part of the separating element inner wall 32 of the separating element 22 formed as a rolling diaphragm sealingly abuts against the housing inner wall 30 and a first separating element outer wall 44 of this separating element faces towards the second space 24. The second space 24 is surrounded by the first separating element outer wall 44 and by a second separating element inner wall 46 of the second separating element 26.

[0035] The diaphragm retaining device 48 of the second separating element 26 extends into the diaphragm folding recess 38. A passage 50 is arranged in the middle of the second separating element 26, which passage connects the second space 24 with the third space 28. In so doing, the passage 50 passes through the second separating element inner wall 46, the second separating element 26 and the second separating element outer wall 52. The third space 28 is surrounded by the second separating element outer wall 52 and by the lid inner wall 54 of the lid 14.

[0036] In the illustrated initial state of the brake system damping device 10, initially no hydraulic pressure 18 is applied to the first space 20, which contains the brake medium. The separating element 22, which is made of elastomer, is here essentially in its basic shape. It then rests against the housing inner wall 30 in such a way that the first space 20 is hermetically sealed relative to the second space 24, which contains a gas, here in particular air. This gas is also present in the third space 28, which is connected to the second space 24 by a passage 50. These two spaces 24, 28 therefore form a common gas volume that is available for damping. The relatively high elasticity of this gas volume allows for a better damping effect during braking or when hydraulic pressure is applied to the first space 20.

[0037] When hydraulic pressure is applied in the first space 20, the separating element 22 deforms in such a way that the gas volume in the second space 24 is reduced. In doing so, the closing element 34 moves into the second space 24. From a certain hydraulic pressure, which is set above the pressure range relevant for damping, the closing element 34 abuts 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 second separating element 26 then acts like a stop. The state of the brake system damping device 10 in which the separating element 22 or the closing element 34 of this separating element abuts against the second separating element 26 and closes the passage 50 is shown in Figures 2 and 3.

[0038] Due to the closure of the passage 50, the third space 28 is now separated from the second space 24, so that only the gas volume remaining in the second space 24 can be used for further damping. Since the second space 24 can take up very little volume, the elastic and damping effect is very small. This effect is desirable, since it also results in a very small increase in the stroke of the brake pedal connected to the brake system. In the state of the brake system damping device 10 shown in FIG. 3, the separating element 22 and the second separating element 26 abut against each other without a gap or over the entire surface, so that the second space 24 is completely absent or has no volume. In this case, the stroke of the brake pedal is not further increased.

[0039] As soon as the hydraulic pressure in the first space 20 is reduced, the separating element 22 returns again to its initial state or position.

[0040] FIG. 2 shows the brake system damping device 10 from FIG. 1, but with a first hydraulic pressure, indicated by arrow 56 in the region of the supply line 16 , applied to the first space 20 .

[0041] As already mentioned, in this case 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. Therefore, only the volume remaining in the second space 24 can be used for further damping, which in the representation in Fig. 2 is mainly around the diaphragm retaining device 48. The influence on the damping and braking processes has already been detailed in the description of Fig. 1 and will not be described again in this respect.

[0042] In FIG. 3 the brake system damping device 10 from FIG. 1 is shown, but with a second hydraulic pressure, indicated by arrow 58 in the region of the supply line 16 , acting on the first space 20 .

[0043] In this case, as already mentioned, 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. Furthermore, the separating element 22 and the second separating element 26 rest against each other without a gap, so that the volume of the second space 24 is eliminated. The associated influence on the damping and braking processes has already been described in detail in the description of FIG. 1 and will not be described again in this respect.

[0044] 4 shows a graph of the dependence of pressure 60 on volumetric intake 62 for such a brake system damping device, with pressure 60 represented on the x-axis and volumetric intake 62 represented on the y-axis. From the coordinate origin of the graph extend a first characteristic line 64 and a second characteristic line 66. In addition to this, the graph shows a vertical dashed line 68 intersecting the x-axis and a horizontal dashed line 70 intersecting the y-axis.

[0045] A first characteristic line 64 shows the dependence of the pressure on the volumetric uptake of the brake system damping device when the volume of medium available for damping is small, which is assumed here for simplicity to represent the volume of the second space 24 in FIG.

[0046] A second characteristic line 66 extending above the first characteristic line 64 represents the dependence of pressure on the volumetric uptake of the brake system damping device 10 when the volume of medium available for damping is relatively large, which is assumed here for simplicity to represent the combined volume of the second and third spaces 24, 28 in FIG.

[0047] A predetermined pressure value 68 is indicated by a vertical dashed line intersecting the x-axis. This pressure value is the upper limit of the pressure range relevant for pulsation damping in such a braking system. This relevant pressure range therefore extends from the coordinate origin to the dashed line.

[0048] A volume limit 70 of the brake system damping device 10 according to the invention is indicated by a horizontal dashed line intersecting the y-axis, which is the volume of the second space 24 in FIG.

[0049] By designing the respective volumes of the second and third spaces 24, 28 accordingly, the brake system damping device 10 can be tuned for the pressure range of interest and for the desired elastic or damping action within this pressure range. At optimum tuning, as shown in the graph of FIG. 4, the dashed lines 68, 70 intersect the characteristic line 66 at a single point.

[0050] In Figure 5, a brake system damping device 10 is shown which differs from that of Figure 1 only in terms of the area towards which the first separating element outer wall 44 of the first separating element 22 formed as a rolling diaphragm faces. The separating element 22 itself and the area towards which the first separating element inner wall 32 of the separating element 22 faces correspond entirely to Figure 1 and will not be described again in this respect.

[0051] The main difference with respect to the brake system damping device 10 in Figure 1 is that instead of the third space 28 and associated passage 50 in Figure 1, the brake system damping device 10 in Figure 5 comprises a first subspace 72 with a passage 74 and a second subspace 76 with a second passage 78, whereby the two subspaces 72, 76 are separated by a separating wall 80. A further difference with respect to Figure 1 is that in Figure 5 the second separating element 26 extends up to the housing inner wall 30 and separates the lid 14 from the housing inner wall.

[0052] All other features correspond to those of Fig. 1. The second space 24 is thus again surrounded by the first separating element outer wall 44 and the second separating element inner wall 46 of the second separating element 26. The second separating element 26 again extends into the diaphragm folding recess 38 of the separating element 22 by means of the diaphragm retaining device 48. In addition to this, the partial spaces 72, 76 are surrounded by the second separating element outer wall 52 and the lid inner wall 54 of the lid 14 in addition to the separating wall 80, as in the third space 28 in Fig. 1.

[0053] The operating principle here is similar to that of the brake system damping device 10 in Fig. 1. When hydraulic pressure is present in the first space 20, the separating element 22 also deforms in such a way that the gas volume in the second space 24 is reduced. The closing element 34 then moves into the second space 24 and comes against the second separating element 26, closing the passages 74, 78 (to the subspaces 72, 76) from a certain hydraulic pressure onwards, which ideally corresponds to the upper limit of the relevant pressure range.

[0054] As soon as the hydraulic pressure in the first space 20 is reduced, the separating element 22 configured as a rolling diaphragm returns to its original state or position, whereby the passages 74, 78 are opened again and the partial spaces 72, 76 are connected again with the second space 24.

[0055] 6 and 7 show an embodiment in which a plug element 82 is provided in the passage 50. The plug element 82 is mushroom-shaped and has a cylindrical mushroom stem 86 extending along a longitudinal axis 84 and a mushroom head 88 formed adjacent to the mushroom stem on the side facing the second space 24. The diameter of the mushroom stem 86 is slightly smaller than the diameter of the passage 50. The diameter of the mushroom head 88 is greater than the diameter of the passage 50, so that the plug element 82 is held in the passage 50 by the mushroom head 88. On the side facing the third space 28, the mushroom stem 86 has three locking projections or locking hooks 90, by means of which the mushroom stem is also held in the passage 50 on this side of the second separating element 26.

[0056] The mushroom head 88 is formed as a convex cap on the side facing the second space 24 against which it can rest when the first separating element 22 moves in the direction of the second separating element 26. The first separating element 22 formed as a diaphragm then does not enter the passage 50 and therefore cannot be damaged there by friction and bending. In addition to this, the relatively large area of ​​the convex cap provides a large working surface for the fluid flowing from the third space 28 through the passage 50 into the second space 24, whereby when the first separating element 22 moves back,

[0057] During such a movement, the closure element 34 of the first separating element 22 is moved in a movement direction 92 so as to enlarge and reduce the second space 24, in particular to open and close the passage 50. Thus, on the side of the plug element 82 facing the closure element 34, no passage opening is formed as would be expected and as shown in Figures 1 to 7, and the cross section of the plug element is not transverse to this movement direction 92. Instead, the plug element 82 is provided in its mushroom head 88 with three passage openings 94, which individually lead into the side of the plug element 82 facing the third space 28 by means of a passage channel 96 in each case for conducting the fluid along the mushroom stem 86.

[0058] The passage openings 94 are each formed with a cross section 98, which is located under a central convex cap in the bottom region of the cup-shaped inner wall 46 of the separating element and is thereby oriented substantially in the movement direction 92 of the closing element 34. "Substantially" is understood in this case to mean that the surface plane of the cross section 98 extends exactly in the movement direction 92 or at least at an angle of less than 10°, in particular less than 5°, to this movement direction 92.

[0059] The individual cross sections 98 then have the shape of a slot, i.e. they have a slot width which is relatively small compared to their slot length.

[0060] Thus, the plug element 82, which is relatively complex in terms of its shape, is here manufactured by an injection molding process from plastic, whereas the second separating element 26 with the passage 50, which is relatively simple in terms of its shape, is made from metal. [Explanation of symbols]

[0061] 10 Brake system damping device 12. Housing 14 Lid 16 Supply line 18 Arrow marked with a cross 20 1st space 22 First separation element 24 Second space 26 Second separation element 28 Third space 30 Housing inner wall 32 Inner wall of first separation element 34 Closing element 36 Diaphragm bend 38 Diaphragm bend recess 40 Diaphragm Collar 42 Coupling frame 44 Outer wall of first separation element 46 Inner wall of second separation element 48 Diaphragm Retaining Device 50 Passage 52 Second separation element outer wall 54 Lid inner wall 56 Arrow 58 Arrow 60 Pressure 62 Volumetric Uptake 64 First characteristic line 66 Second characteristic line 68 Pressure Value 70 Dashed Line 72 First subspace 74 Passage 76 Second subspace 78 2nd aisle 80 Separation wall 82 Plug element 84 Longitudinal axis 86 Mushroom stem 88 Mushroom Head 90 Locking hook 92 Direction of movement 94 Passage opening 96 Passageway 98 Cross Section

Claims

1. A brake system damping device (10) comprising a first space (20) to which hydraulic pressure is to be applied, a second space (24) containing a compressible medium, and a first separation element (22) separating the first space (20) from the second space (24), the brake system damping device (10) further comprising a third space (28) containing a compressible medium and a second separation element (26) separating the second space (24) from the third space (28), the second space (24) being separated by the second separation element (22). a plug element (82) arranged in said passage (50), said plug element (82) being connected in a fluid-conducting manner to said third space (28), said plug element (82) being arranged in said passage (50), said plug element (82) being arranged in said passage (50), and a closing element (34) being movable together with said first separating element (22), said closing element (34) being closed in a moving direction (92) as soon as a hydraulic pressure reaches a predetermined pressure value (68) in said first space (20), the plug element (82) is mushroom-shaped and formed with a mushroom head (88) on the side facing the second space (24), a mushroom stem (86) extending along a longitudinal axis (84) and a locking hook (90) on the side facing the third space (28); 11. A brake system damping device, comprising: a plug element (82) having at least one passage opening (94) formed by a locking hook (90), a slot formed in the mushroom stem (86), and a slot formed in the mushroom head (88).

2. A brake system damping device as described in claim 1, characterized in that the plug element (82) is formed with at least one passage opening (94) on the side facing the second space (24), and a cross-section (98) of the passage opening is oriented substantially in the direction of movement (92) of the closure element (34).

3. A brake system damping device as described in claim 1 or 2, characterized in that two to four, in particular three, passage openings (94) are provided.

4. A brake system damping device as described in any one of claims 1 to 3, characterized in that the second separation element (26) is made of metal and the plug element (82) is made of plastic.

5. A brake system damping device as described in any one of claims 1 to 4, characterized in that the first separation element (22) is formed with a diaphragm, in particular a rolling diaphragm.

6. A brake system damping device as described in any one of claims 1 to 5, characterized in that the first separation element (22) is made from an elastomer, in particular from ethylene propylene diene rubber.

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