EP2359011A1

EP2359011A1 - Buffer reservoir for a hydraulic actuation device and hydraulic actuation device

Info

Publication number: EP2359011A1
Application number: EP09759952A
Authority: EP
Inventors: Werner Schmauder; Bernd Nenning
Original assignee: Gustav Magenwirth GmbH and Co KG
Current assignee: Gustav Magenwirth GmbH and Co KG
Priority date: 2008-11-27
Filing date: 2009-11-26
Publication date: 2011-08-24
Also published as: DE102008060165A1; WO2010060973A1; DE102008060165B4; US20110266286A1

Abstract

In order to provide a buffer reservoir for a hydraulic actuation device, in particular for a clutch or brake actuation device of motor vehicles, comprising an outlet that can be connected to an actuation cylinder, a container body that sits above the outlet and that has a storage chamber provided therein for holding hydraulic fluid and an air chamber disposed above a fluid level delimiting the storage chamber, wherein a suction of air bubbles into the actuation cylinder can be reduced, if not avoided, it is proposed that a separating unit be disposed in the storage chamber running at a distance from the fluid level, said separating unit subdividing the storage chamber into a suction chamber that borders the outlet and a reserve chamber that is disposed between the separating unit and the fluid level, and that hydraulic fluid is able to enter the suction chamber from the reserve chamber through at least one connection between the reserve chamber and the suction chamber.

Description

Overflow accumulator for a hydraulic actuator and hydraulic actuator

The invention relates to an overflow accumulator for a hydraulic actuation device and a hydraulic actuation device, in particular a clutch or brake actuation device for motor vehicles.

Hydraulic actuating device with a lagging accumulator, in which a hydraulic fluid is stored, that in case of a loss of the hydraulic fluid, these can each run after the actuator.

Further, the lagging accumulator is preferably also arranged so that bubbles forming in the actuator can escape into the lagging accumulator, and thus their volume is replaced by trailing hydraulic fluid, so that deterioration of the actuator's action due to the compressibility of the air in the bladders can be avoided ,

Such a lagging accumulator is usually provided with an outlet which can be connected to an actuating cylinder, and has a container body rising above the outlet with a storage chamber provided therein for receiving hydraulic fluid and with an air chamber lying above a fluid level delimiting the storage chamber ,

Such an air chamber in the overflow accumulator is required to open the possibility to be able to easily check the position of the liquid level and thus the level of the supply reservoir via a viewing window. However, the presence of such an air chamber has the disadvantage that vibrations, in particular vibrations of high-speed motors, which are transferred to the hydraulic actuator, cause the formation of air bubbles in the hydraulic fluid, which give the hydraulic fluid a kind of emulsion, and thus the Hydraulic fluid foams at least in the region of the liquid level.

Such foaming of the hydraulic fluid renders it unsuitable for after-running or re-tamping of hydraulic fluid into the actuation cylinder, since this also poses a considerable risk of air bubbles entering the actuation cylinder and thereby impairing the action of the actuation device.

The invention is therefore an object of the invention to provide a caster for a hydraulic actuator, in which a suction of air bubbles in the actuating cylinder reduces, if not avoided.

This object is achieved with a lagging accumulator of the type described above according to the invention that in the storage chamber a spaced apart from the present in the usual operating state liquid level separating unit is arranged, which the storage chamber in an adjacent to the outlet suction and between the separation unit and subdivided into the liquid level Vorhaltekammer, and that at least one connection between the Vorhaltekammer and the suction chamber hydraulic fluid from the Vorhaltekammer can enter into the suction chamber. The advantage of the solution according to the invention lies in the fact that the separation unit opens up the possibility of substantially keeping the foam forming in the reserve chamber, in particular near the liquid level, and the resulting emulsion of air bubbles and hydraulic fluid from the suction chamber and thus the probability in that air bubbles are sucked in by the actuating cylinder.

In principle, the connection between the supply chamber and the suction chamber could be arranged at any desired location, in particular at any point of the separation unit.

However, in order to reduce the likelihood that air bubbles are transported by the hydraulic fluid from the Vorhaltekammer in the suction chamber, it is preferably provided that the connection is close to the ground of the Vorhaltekammer.

On the one hand, this arrangement of the connection has the advantage that hydraulic fluid can continue to run into the intake chamber to the greatest extent possible even when a minimum filling quantity of the supply reservoir is undershot and, on the other hand, has the advantage that air bubbles penetrate into a region near the bottom Propagating chamber is reduced, that is reduced so that the probability of the transport of air bubbles from the Vorhaltekammer in the suction chamber.

On the other hand, as already mentioned, air bubbles also escape from the actuating cylinder and reach the suction chamber via the outlet. In order to be able to remove such air bubbles collecting in the suction chamber therefrom, it is preferably provided that the separating unit has a bubble outlet opening into the holding chamber.

Such a bubble outlet opening is preferably arranged so that it lies in a region near or in the suction chamber, which is arranged next to the liquid level, so that bubbles occurring in the suction chamber collect in the region of the bubble outlet opening.

In order to guide substantially all bubbles rising in the suction chamber to the bubble outlet opening, it is preferably provided that the separation unit has a bubble rising in the suction chamber leading to the bubble outlet opening leading bubble guide surface.

That is, the bubble guide surface always conveys the rising bubbles to the bubble exit port to prevent a larger accumulation of rising bubbles in the suction chamber.

Preferably, the bubble guide surface is formed so that it extends from a maximum distance from the liquid level having edge region with steadily decreasing distance from the liquid level to the bubble exit opening and thus causes the rising bubbles due to the buoyancy acting on these always on the Walk along the bubble guide surface and thereby reach the bubble exit opening.

In particular, the bubble outlet opening is arranged at a location of the bubble guide surface closest to the liquid level. In particular, in order to achieve that all bubbles entering the suction chamber from the actuating cylinder are led to the bubble outlet opening, it is preferably provided that the separation unit with its bubble guide surface overlaps the outlet.

It is particularly advantageous if the bubble outlet opening is arranged in a region of the separation unit, which has a distance from the outlet in the direction parallel to the liquid level.

With regard to the formation of the connection between the Vorhaltekammer and the suction chamber so far no details have been made.

In the simplest case, it is provided that the connection leads from the holding chamber directly to the suction chamber.

In order to additionally reduce the likelihood that hydraulic fluid flowing from the reserve chamber into the suction chamber transports air bubbles into the suction chamber, it is preferably provided that the connection forms a settling chamber for the suction chamber

Hydraulic fluid comprises, so that the hydraulic fluid flows first from the Vorhaltekammer in the settling chamber and then from the settling chamber into the suction chamber.

This solution can be realized particularly favorably by the fact that the

Settling chamber is separated from the Vorhaltekammer by the separation unit.

In order to be able to remove bubbles from both the settling chamber and from the suction chamber, it is preferably provided that both the Soothing chamber and the suction chamber extend to the bubble guide surface, so that can be dissipated from both the settling chamber and the suction chamber ascending bubbles.

In principle, it would be conceivable to provide a bubble outlet opening both for the settling chamber and for the suction chamber, so that the bubble guide surfaces can each extend to different bubble outlet openings.

An advantageous embodiment provides that the bladder-guiding surface leads the ascending bladders to the bladder outlet opening both with its region encompassing the aspiration chamber and with its region encompassing the settling chamber.

In order to provide the possibility in the region of the bubble outlet opening that bubbles accumulate before they pass through the bubble outlet opening, it is preferably provided that the suction chamber changes into a bubble collecting chamber arranged in the region of the bubble outlet opening.

Furthermore, it is also preferably provided that the settling chamber merges into the bubble collecting chamber arranged in the region of the bubble outlet opening.

With regard to the design of the separation unit, no further details have been given so far.

Thus, an advantageous solution provides that the separation unit has a cover forming the bubble guide surface. In particular, it is advantageous if the cover of the separation unit is part of an inserted into the container body insert part, so that so that the cover can be mounted in a simple manner.

Further, it is preferably provided that the separation unit has side walls, wherein the side walls preferably lead from a container bottom to the cover.

The side walls could also be provided on an insert part, or be provided on the cover and be used with this in the container body.

However, another advantageous solution provides that at least one side wall of the separation unit is integrally formed on the container body.

It is particularly favorable if all side walls of the separation unit are formed on the container body.

In the case of a calming chamber provided in addition to the suction chamber, it is preferably provided that the separating unit separates the suction chamber and the settling chamber from the retaining chamber.

In order to separate the suction chamber and the settling chamber from each other, it is preferably provided that they are separated from each other by at least one separating element.

It is particularly advantageous if the at least one separating element extends from the container bottom to the bubble guide surface, so that it can be ensured that bubbles from the settling chamber do not enter the suction chamber. In particular, in order to reduce or prevent the formation of foam in the region of the retention chamber, a further advantageous solution provides that a liquid retaining element is arranged in the retention chamber.

Such a liquid retaining element serves to prevent a free movement of the liquid and to keep the liquid as quiet as possible relative to the container body.

This is done in particular by the fact that the liquid holding element the

Volume for the brake fluid is divided into small-volume receiving spaces, such small-volume receiving spaces have a volume which is a maximum of 0.5 cm ³ , better at most 0.2 cm ³ more preferably at most 0.1 cm ³ , and thus a strong coupling of the liquid causes the container body.

In particular, such a liquid retaining element is made of a braid, a knitted fabric, a knitted fabric or a woven fabric which is either folded into folds or folded statistically and thus preferably fills the pre-holding chamber as far as possible.

In this case, the braid, the knitted fabric, knitted or woven fabric may be, for example, fibers or threads or strands of metal or plastic.

Alternatively, another advantageous solution provides that the liquid retaining element is made of an open-pore and coarse-pored body, for example of carbon fibers, plastic or metal, which also provides the possibility to provide small-volume receiving spaces for the brake fluid available, although these small-volume receiving spaces also communicate with each other, so that the brake fluid - if necessary - can pass through unhindered. An alternative or possibly also supplementary advantageous solution provides that volume dividers are provided in the supply chamber.

Such volume dividers are, for example, wall elements, webs or

Columns, which are for example formed on a support, wherein the support is in turn connected to the container body.

For example, such volume dividers can be integrally molded either to the container body, to the separation unit or to a lid of the container body.

Such volume dividers are also preferably used to subdivide the volume for the brake fluid into partial volumes and thus to reduce the foaming.

A particular advantage of such volume divisors is that they are preferably oriented so as to permit, preferably even allow, bubbles to rise in the direction opposite to gravity. In particular, however, the volumetric dividers are arranged to prevent spreading of the bubbles transversely to the direction of gravity, thus helping to reduce or even prevent foaming in the feed chamber.

As an alternative or in addition to providing a liquid holding element in the holding chamber, a further advantageous solution provides that a liquid holding element is arranged in the suction chamber and / or the settling chamber. A liquid holding member in the suction chamber and / or the settling chamber serves the same purpose, in particular the prevention of foaming and the calming of the liquid in this chamber.

In this solution as well, it is preferably provided that the liquid holding element subdivides the volume for the brake fluid into small-volume receiving spaces.

Such small-volume accommodation spaces preferably have the same dimensions and the same purpose as the small-volume accommodation spaces described in connection with the liquid retention element in the storage chamber.

In addition, such a liquid holding member in the suction chamber and / or the settling chamber can be constructed and formed in the same manner as described in connection with the liquid retaining element for the Vorhaltekammer.

As an alternative or in addition to providing a liquid retaining element, a further solution provides that volume dividers are provided in the suction chamber and / or the settling chamber.

Such volume divider may be formed in the same manner as described in connection with the volume dividers in the Vorhaltekammer.

In particular, when providing volume dividers in the suction chamber and / or the settling chamber, it is provided that these volume dividers are attached the container body are held, preferably integrally formed on the container body.

Alternatively, however, it is also possible to mold such volume dividers, for example, to the separation unit.

Also, such volume divider in the suction and / or the reassurance chamber serve the same purpose, as described in connection with the volume dividers in the Vorhaltekammer, in particular, such volume divider effect a subdivision of the volume of the brake fluid in partial volumes, so that the brake fluid by the subdivision into the Partial volumes, which then lie between the volume dividers, calms and is coupled with the container body in terms of their movement, so that a free movement of the brake fluid can be suppressed.

In particular, volumetric dividers in the suction chamber and / or the settling chamber therefore make sense, since they facilitate the possibility in a simple manner to rise substantially unhindered in the brake fluid opposite to gravity and thus bubbles can be removed from the suction chamber and / or the settling chamber in a simple manner so that there is also the possibility of preventing any foaming in the area of the suction chamber and / or the settling chamber, even if bubbles have to pass through the suction chamber and the settling chamber from the hydraulic system.

For this reason, for example, provides an advantageous solution that in the suction chamber and / or the settling chamber preferably volume dividers are provided while, for example, in the Vorhaltekammer preferably a liquid retaining element is arranged. However, it is also possible, with a suitable design, to provide a liquid holding element in the suction chamber and / or the settling chamber, while volume dividers are provided in the feed chamber.

In addition, the invention relates to a hydraulic actuator, in particular a brake actuator for motor vehicles, comprising a base housing and an actuating cylinder and a lag memory, wherein according to the invention the lag memory is formed according to one of the embodiments described above.

Further features and advantages of the invention are the subject of the following description and the drawings of some embodiments.

In the drawing show:

1 shows a perspective view of a first embodiment of a brake actuating device according to the invention;

2 shows a section along line 2-2 in Fig. 3 by the first embodiment of the brake actuator according to the invention,

FIG. 3 is a plan view of a lagging accumulator with the cover removed; FIG.

4 shows a section similar to FIG. 2 through a second embodiment of an actuating device according to the invention; Fig. 5 is a plan view similar to Figure 3 on the second embodiment.

Fig. 6 is a plan view similar to Figure 5 with removed cover of the separation unit.

Fig. 7 is a section similar to FIG. 2 by a third

Embodiment of an actuating device according to the invention;

Fig. 8 is a section similar to Fig. 4 by a fourth

Embodiment of an actuating device according to the invention;

Fig. 9 is a plan view similar to FIG. 5 on the fourth

Embodiment and

Fig. 10 is a plan view similar to FIG. 6 on the fourth embodiment.

An exemplary embodiment of a brake actuation device 10 according to the invention for motor vehicles, in particular for handlebar-guided motor vehicles, comprises a base housing 12 on which a brake lever 14 is pivotably mounted about a pivot axis 16.

The base housing 12 is fastened by means of a holder 18 to a handlebar of a handlebar-guided vehicle such that the brake lever 14 is pivotable when actuated in the direction of a handle of the handlebar. With the brake lever 14, an actuating cylinder 20 can be acted upon, in such a way that its pressure piston 22 is displaceable by reducing a volume of a cylinder chamber 24 to increase in a cylinder chamber 24 connected to the hydraulic system in this present pressure and thus a to operate the brake cylinder, not shown drawing to brake the vehicle.

In order to provide the cylinder chamber 24 and the hydraulic system 26 always sufficient hydraulic fluid, in particular brake fluid available, a follow-up accumulator 30 is arranged on the base housing 12, which has an outlet 32, from which brake fluid can enter the cylinder chamber 24, always at not actuated actuating cylinder 20, so that it is always completely filled with brake fluid and also settle in this no air bubbles, which would reduce the braking effect due to the compressibility of the air.

The outlet 32 is preferably designed as an outlet connection 34, which is inserted into a retaining projection 36 of the base housing 12 and sealed with a surrounding seal 38 in the retaining extension 36, wherein the back-up container 30 is fixed in the retaining extension 36 by tie rods 40.

The outlet nozzle 34 is followed by a container body 50 which rises above the outlet 32 and which, following the outlet nozzle 34, first widens with a container bottom 52 adjoining it and then rises above the container bottom 52 with side walls 54, namely until to a filling opening 56, which can be closed by a cover 58.

In the container body 50 is a designated as a whole by 60 storage chamber for hydraulic fluid, which extends from the outlet 32nd and the container bottom 52 extends up to a liquid level 62, and above the storage chamber 60 is an air chamber 64, so that in normal proper operating condition from the outside, for example by a Prüffenster 66, the position of the liquid level 62 within intended operating state limits is recognizable and thus recognizable whether sufficient brake fluid is present in the container body 50 and thus the storage chamber 60 has a sufficiently large volume.

The vehicles provided with brake actuation devices 10 according to the invention preferably have motors which operate at high speed and thus transmit vibrations at frequencies corresponding to these speeds to the handlebar and thus also to the base housing 12 and the container body 50.

Such vibrations cause the brake fluid in the region of the liquid level foam 68 forms, since brake fluid mixed with the adjacent air of the air chamber 64 and the existing air bubbles in the brake fluid have a significantly long life, so that the forming foam 68 until it is at rest dissolves.

In order to avoid that this foam 68 can enter the cylinder chamber 34 through the outlet 32 and thus significantly worsen the braking effect due to the compressibility of the air, in the storage chamber 60 there is provided a separating unit 70, designated as a whole, which stores the storage chamber 60 into a directly adjoining the outlet 32 suction chamber 72 and a lying between the separation unit 70 and the liquid level 62 Vorhaltekammer 74 divided.

The separation unit 70 is now used to form in the Vorhaltekammer 74, preferably near the liquid level 62 forming foam 68 of the Keep suction chamber 72 away and thus always in the suction chamber 72 to provide brake fluid for sucking by the actuating cylinder 20 is available, which is free of air bubbles and foam 68th

On the other hand, there is a need to replace the amount of brake fluid, which is sucked by the actuating cylinder 20 from the suction chamber 72, by the brake fluid from the Vorhaltekammer 74.

For this reason, a connection 76 is provided between the supply chamber 74 and the intake chamber 72, as shown in Fig. 3, through which brake fluid from the Vorhaltekammer 74 can enter into the suction chamber 72.

Since bubbles can also form in the hydraulic system 26 for various reasons, for example because of leaks, which can be found in the cylinder chamber 24 and then enter the suction chamber 72 from the cylinder chamber 24 via the outlet 32, the separating unit is formed 70 with a bubble outlet opening 80 through which bubbles from the suction chamber 72 can pass into the Vorhaltekammer 74 and thus can escape in the direction of the liquid level 72.

In order to ensure that the bubble outlet opening 80 discharges all air bubbles from the suction chamber 72, the separation unit 70 is provided with a bubble guide surface 82 which, on the one hand, engages over the entire suction chamber 72 and extends from an edge region 84, which has a maximum distance from the liquid mirror 62, rising steadily up to the bubble outlet opening 80, wherein the bubble outlet opening 80 is disposed at a liquid level 62 nearest the point of the bubble guide surface 82. Thus, the bubble guide surface 82 performs all, from the suction chamber 72 upwardly rising gas containing bubbles 86, in particular air bubbles to the bubble outlet 80 through which the air bubbles 86 leave the intake chamber 72 and can pass into the Vorhaltekammer 74.

Thus, there is the possibility, even if in the suction chamber 72 air bubbles 86 should form, to remove them from the suction chamber 72.

Preferably, the separation unit 70 is formed so that it has on the one hand side walls 90, which are integrally formed on the container bottom 52, and on the other hand, sitting on the side wall portions cover 92 which closes the suction chamber 72 upwards, that is in the direction of the liquid level 62 and on its the suction chamber 72 side facing the bubble guide surface 82 forms.

The cover 92 adjoins directly to the bubble outlet opening 80, which, as shown in Fig. 3, between one of the wall sections 94 and an edge 96 of the cover 92 is located.

Further, a wall portion 98 is provided with a connection 76 performing passage 100, wherein the passage 100 is disposed laterally of the outlet 32 and preferably extends to a lowermost portion 102 of the trailing chamber 74, even if the liquid level 62 would drop sharply to ensure that the existing in the Vorhaltekammer brake fluid substantially into the suction chamber 72.

The fact that the passage 100 is arranged in the lowest region 102 of the Vorhaltekammer 74, it is also ensured that in this area With very little probability foam 68 and / or air bubbles 86 are present, so that a refilling of the suction chamber 72 always takes place with substantially foam-free and bubble-free brake fluid.

In a second embodiment of a Bremsbetäti- supply device 10 'according to the invention, shown in FIGS. 4 to 6, the lag memory 30' insofar as the same parts are used, provided with the same reference numerals, so that fully to the comments on the first embodiment of the invention Tracking memory can be referenced.

In contrast to the first exemplary embodiment of the afterflow accumulator 30 according to the invention, in the second exemplary embodiment of the accumulator 30 'according to the invention, the suction chamber 72' below the separation unit 70 is surrounded by a separation unit 110 rising from the container bottom 52 and integrally formed thereon by a separation unit 110 and up to Surrounding the sidewalls 90 of the separation unit 70 extending calming chamber 120, which connects in particular to the passage 100, so that through the passage 100 entering brake fluid first reaches the calming chamber 120 and in this there is the possibility that even in this brake fluid possibly existing air bubbles rise and reach the bubble guide surface 82 and are guided by this to the bubble outlet opening 80.

The separation unit 110 enclosing the suction chamber 72 'has an opening 112 which is arranged facing the bubble outlet opening 80 and thus opens up the possibility that bubbles 86 rising in the suction chamber 72' reach a region 114 of the bubble guide surface 82 which overlaps the suction chamber 72 'and then along the bubble guide surface 82 have the opportunity to move in the direction of the bubble outlet opening 80 to leave the suction chamber 72 '. Furthermore, partition walls 116 are provided downstream of the opening 112, which likewise separate an area of the suction chamber 72 'extending beyond the opening 112 from the settling chamber 120 and, in particular, also cause bubbles forming in the settling chamber 120 to flow in the direction of the Move the bubble outlet 80.

Preferably, both the suction chamber 72 'and the settling chamber 120 merge into a bubble collection chamber 130, which is still between the container bottom 52 and the bubble guide surface 82 and the bubble outlet 80, but outside the suction chamber 72' and the settling chamber 120, so that the air bubbles 86th before they pass through the bubble outlet 80, as far as the suction chamber 72 'are moved out that they can not be sucked by the actuating cylinder 20.

Furthermore, in each case between the partition wall 90 near the opening 112 and the partition walls 116 each have a passage 122 is provided, the brake fluid from the settling chamber 120 into the suction chamber 72 'occurs, the brake fluid then has the option, via the opening 112 enter the region of the suction chamber 72 'enclosed by the separation unit 110.

Thus, in this embodiment, the communication 76 between the supply chamber 74 and the suction chamber 72 'passes first through the passage 100 into the settling chamber 120 and from the settling chamber 120 through the passages 122 into the suction chamber 72'.

Incidentally, the second embodiment works in the same way as the first embodiment, so that in this regard, the contents of the first embodiment, reference is made in full. In a third exemplary embodiment, illustrated in FIG. 7, additional liquid holding elements 132, 134 are provided in the suction chamber 72 and in the reserve chamber 74, the small volume receiving spaces 136, 138, in particular smaller than 0.5 cm ³ , connected to one another, even better than less than 0.2 cm ³ , in which the brake fluid is held and which slow down a free movement of the fluid to reduce or prevent foaming.

Advantageously, the liquid holding elements 132, 134 have such small volume connection channels with each other that the foam 68 is retained and can not spread in the reaching to the liquid level 62 bath of the brake fluid.

In order not to prevent the rise of air bubbles from the hydraulic system 26, the liquid holding members 132, 134 have ascending bubbles 142, 144 for rising bubbles, the riser passage 142 overlying the outlet nozzle 34 and the riser passage 144 overlying the bubble outlet 80.

Preferably, the fluid retention members 132, 134 are formed from a braid, knit, knit, or web that may, for example, be pleated or simply randomly folded to form the containment spaces 136, 138.

Preferably, the braids, knitted fabrics, knits or fabrics of threads, fibers or strands of plastic carbon fibers or metal.

Alternatively, it is also conceivable to use coarse-pore and open-pore bodies made of carbon fibers or plastic or metal for the liquid-holding elements 132, 134. In a fourth embodiment, shown in FIGS. 8 to 10, to prevent free movement of the brake fluid volume divider 152 in the settling chamber 120 and volume divider 154 are provided in the Vorhaltekammer 74, wherein the volume dividers 152 held on the container bottom 52, preferably integrally formed and extend in the direction of the separation unit 70, while the volume dividers 154 are formed on the separation unit 70 and extend in the direction of the liquid level 62.

The volume divider 152, 154 are formed, for example, as wall pieces, webs or columns and subdivide the respective volume into interconnected sub-volumes 156, 158, so that the brake fluid in these sub-volumes 156, 158 has less tendency to move freely and foam.

Even in these existing bubbles are difficult or impossible to expand into other sub-volumes 156, 158, but ascend only opposite to gravity.

Furthermore, the volume dividers 152, 154 are in particular designed such that they have smooth walls along which bubbles rise unhindered in opposite direction to the force of gravity and thus can emerge from the suction chamber 72 and the retention chamber 74.

In addition, the sub-volumes 156, 158 are dimensioned such that the brake fluid can settle unhindered in the direction of gravity and thus, if necessary, can run in the direction of the outlet nozzle 34. In particular in the retention chamber 74, the volume dividers 154 can reduce or even prevent a spread of foam 68 into the bath of the brake fluid.

Claims

PAT EN TA NSPR O CHE

A lagging accumulator (30) for a hydraulic actuation device (12), in particular for a clutch or brake actuation device of motor vehicles, comprising an outlet (32) connectable to an actuation cylinder (20) located above the outlet (32 ) raising container body (50) having a storage chamber (60) provided therein for receiving hydraulic fluid and having a storage chamber (60) delimiting liquid level (62) lying air chamber (64), characterized in that in the storage chamber (60) a separation unit (70) extending at a distance from the liquid level (62) is arranged, which connects the storage chamber (60) into a suction chamber (72) adjoining the outlet (32) and between the separation unit (70) and the liquid level (62) Diverging the reserve chamber (74), and that by at least one connection (76) between the Vorhaltekammer (74) and the A Suction chamber (72) hydraulic fluid from the Vorhaltekammer (74) into the suction chamber (72) can occur.

Second after-reservoir according to claim 1, characterized in that the connection (76) near the bottom of the Vorhaltekammer (74) is arranged.

3. Overflow reservoir according to claim 1 or 2, characterized in that the separation unit (70) has a in the Vorhaltekammer (74) opening out the blister outlet opening (80).

4. Overflow reservoir according to one of claims 1 to 3, characterized in that the separation unit (70) in the suction chamber (72) rising bubbles (86) to the bubble outlet opening (80) leading bubble guide surface (82).

5. after-reservoir according to claim 4, characterized in that the bubble guide surface (82), starting from a maximum distance from the liquid level (62) having edge region (84) with steadily decreasing distance from the liquid level (62) to the bubble outlet opening (80). runs.

6. lagging accumulator according to claim 4 or 5, characterized in that the bubble outlet opening (80) at a liquid level (62) nearest point of the bubble guide surface (82).

7. lagging accumulator according to one of claims 4 to 6, characterized in that the separating unit (70) with its bubble guide surface (82) engages over the outlet (32).

8. lagging accumulator according to one of claims 3 to 7, characterized in that the bubble outlet opening (80) in a region of the separation unit (70) is arranged, which in the direction parallel to the liquid level (62) has a distance from the outlet (32) ,

9. lagging accumulator according to one of the preceding claims, characterized in that the connection (76) comprises a calming chamber (120) for the suction chamber (72 ') flowing hydraulic fluid.

10. lagging accumulator according to claim 9, characterized in that the settling chamber (120) from the Vorhaltekammer (74) through the separation unit (70) is separated.

11. lagging accumulator according to claim 9 or 10, characterized in that extending both the calming chamber (120) and the suction chamber (72 ') to the bubble guide surface (82).

12. lagging accumulator according to one of claims 9 to 11, characterized in that the bubble guide surface (82) both with its suction chamber (72 ') cross-section as well as with their the settling chamber (120) cross-section the rising bubbles (86) to the Bubble outlet opening (80) leads.

13. Overflow reservoir according to one of claims 9 to 12, characterized in that the suction chamber (72, 72 ') in a in the region of the bubble outlet opening (80) arranged bubble collecting chamber (130) passes.

14. Overflow reservoir according to one of claims 9 to 13, characterized in that the settling chamber (120) in a in the region of the bubble outlet opening (80) arranged bubble collecting chamber (130) passes.

15. Overflow reservoir according to one of claims 4 to 14, characterized in that the separation unit (70) has a bubble guide surface (82) forming the cover (92).

16. Overflow accumulator according to one of the preceding claims, characterized in that a cover (92) of the separation unit (70) is part of an inserted into the container body (50) insert part.

17. Overflow store according to one of the preceding claims, characterized in that the separation unit (70) has side walls (90).

18. caster according to one of the preceding claims, characterized in that at least one side wall (90) of the separating unit (70) is integrally formed on the container body (50).

19. Overflow reservoir according to one of claims 9 to 18, characterized in that the suction chamber (72, 72 ') and the settling chamber (120) by at least one separating element (110, 116) are separated from each other.

20. lagging accumulator according to claim 19, characterized in that the at least one separating element (110, 116) extending from the container bottom (52) to the bubble guide surface (82).

21, after-reservoir according to one of the preceding claims, characterized in that in the Vorhaltekammer (74) a liquid holding element (134) is arranged.

22. Overflow reservoir according to claim 21, characterized in that the liquid retaining element (134) subdivides the volume for the brake fluid into small-volume receiving spaces (138).

23 afterflow accumulator according to one of the preceding claims, characterized in that in the Vorhaltekammer (74) volume divider (154) are provided.

24. Overflow reservoir according to claim 23, characterized in that the volume dividers (154) subdivide the volume for the brake fluid into partial volumes (158).

25. Overflow accumulator according to one of the preceding claims, characterized in that in the suction chamber (72) and / or the settling chamber (120) a liquid holding member (132) is arranged.

26. Overflow reservoir according to claim 25, characterized in that the liquid retaining element (132) subdivides the volume for the brake fluid into small-volume receiving spaces (136).

27. Overflow reservoir according to one of the preceding claims, characterized in that in the suction chamber (72) and / or the settling chamber (120) volume divider (152) are provided.

28. Overflow reservoir according to claim 27, characterized in that the volume dividers (152) subdivide the volume for the brake fluid into partial volumes (156).

29. Hydraulic actuating device, in particular clutch or brake control device for motor vehicles, comprising a base housing (12) and an actuating cylinder (20) and a lagging memory (30), characterized in that the lagging memory is designed according to one of claims 1 to 28.