Vibration damper with control valve in the exterior

Abstract

A vibration damper (1) includes a container tube (2), an inner tube (3), a piston (4), a piston valve device (5), a bottom valve device (6), a first overflow pipe (11), an electrically operable first control valve (9), and an electrically operable second control valve (10). The inner tube (3) is arranged in the container tube (2). The piston (4) is axially movable in the inner tube (3) and divides the internal space of the inner tube (3) into a first working chamber (AK1) and a second working chamber (AK2). The piston valve device (5) is arranged at the piston (4) and configured to allow the damping medium to overflow between the first working chamber (AK1) and the second working chamber (AK2) during the tension and pressure phases of the vibration damper (1). A compensation chamber (AGK) is provided between the inner circumference of the container tube (2) and the outer circumference of the inner tube (3). The bottom valve device (6) connects the second working chamber (AK2) in the working chamber to the compensation chamber (AGK) so that the damping medium can overflow between the working chamber (AK2) and the compensation chamber (AGK) during the tension and pressure phases of the vibration damper (1). The first overflow pipe (11) is arranged between the inner pipe (3) and the container pipe (2) and provides a first additional flow path (Ü1) from the first working chamber (AK1) in the working chamber to the compensation chamber (AGK).

Description

Technical Field

[0001] This invention relates to a vibration damper, comprising a container tube, an inner tube, a piston, a piston valve assembly, a bottom valve assembly, an overflow pipe, an electrically operable first control valve, and an electrically operable second control valve. The inner tube is arranged within the container tube, and the piston is axially movable within the inner tube, dividing the internal space of the inner tube into two working chambers. The piston valve assembly is arranged at the piston and configured to allow overflow of the damping medium between the working chambers during the tension and pressure phases of the vibration damper. A compensation chamber is provided between the inner circumference of the container tube and the outer circumference of the inner tube. The bottom valve assembly connects one of the working chambers to the compensation chamber. To enable the overflow of the damping medium between the working chamber and the compensation chamber during the tension and pressure phases of the vibration damper, an overflow pipe is arranged between the inner tube and the container tube and provides a first additional flow path from one of the working chambers to the compensation chamber. A first control valve works in conjunction with the first additional flow path to control the overflow of the damping medium through the first additional flow path. A second control valve works in conjunction with a second additional flow path from the other working chamber to the compensation chamber to control the overflow of the damping medium through the second additional flow path. Sections of the first and second control valves protrude radially outward from the container tube. Background Technology

[0002] A vibration damper of this type is known from DE 100 25 399 A1. In this type of vibration damper, the control valve is externally mounted on the container tube. Compared to vibration dampers with an internal control valve, this allows for a slimmer structure of the container tube.

[0003] The damping characteristic curve of the vibration damper can be adjusted as needed during the vehicle's operation, not only during the tension phase (i.e., when the piston rod is extended) but also during the pressure phase (i.e., when the piston rod is inserted and the piston moves in the direction of the bottom valve device). To this end, in addition to the overflow path via the piston valve device and / or the bottom valve device, corresponding bypass or additional overflow paths are opened to varying degrees by means of the control valve.

[0004] Sometimes, in installation situations where the vibration damper is short, the external control valve, for packaging reasons, should be installed at approximately the same height and on the opposite side of the container tube. This can cause the control valve to collide with surrounding components when the suspension of the relevant wheel compresses. In such cases, it may be necessary to place the control valve as close as possible to the bottom valve of the vibration damper. For example, in a motor vehicle, one control valve may point in the direction of travel, while the other points against the direction of travel, as described in DE 100 25 399 A1. However, other orientations are also possible.

[0005] Due to the structural type, the additional overflow path can only branch off from the working chamber of the inner tube opposite the piston's extreme positions during the tension and pressure phases, i.e., practically at the opposite end sections of the damper in its longitudinal direction. Therefore, positioning the control valve correspondingly above and below the vibration damper may seem suitable at first glance, but in the above-described installation situation, this is sometimes undesirable.

[0006] The following additional overflow device provides a remedy, which, while not simplifying the structure of the vibration damper, allows for greater freedom in the design of the control valve's positioning. In DE 100 25 399 A1, the control valve is effectively brought to the same height by means of an internal overflow pipe surrounding the inner tube. An intermediate ring connects the two overflow pipes and simultaneously separates the two additional overflow paths. Two control valves are further positioned at this intermediate ring, each extending radially outward in sections through openings in the container tube. This intermediate ring is a relatively complex component, with numerous sealing portions and through-channels for the damping medium. Summary of the Invention

[0007] In this context, the present invention describes an alternative solution based on the following objective, which also allows two control valves to be externally arranged at approximately the same height at the container tube.

[0008] This task is accomplished by a vibration damper of the type described above, which is characterized by an overflow pipe having an end section obliquely cut with respect to the longitudinal axis of the vibration damper, a first control valve being placed at the oblique end section, and a second control valve being arranged at the height of the oblique end section with respect to the longitudinal axis of the vibration damper.

[0009] This allows for a simpler connection of the control valves. Due to the bevel at the overflow pipe, one of the additional flow paths on one side of the container pipe can extend to the height of the control valve for the other additional flow path, thus eliminating the need for a dedicated intermediate ring for connecting the control valves.

[0010] Therefore, in the first variant for providing a second additional flow path, the inner tube can have a radial opening between another working chamber and the compensation chamber. In this case, the second control valve can be placed directly at this radial opening.

[0011] In the second variant, a second overflow pipe is arranged between the inner pipe and the container pipe, providing a second additional flow path from another working chamber to the compensation chamber. Here, the second overflow pipe has an end section that is obliquely cut with respect to the longitudinal axis of the vibration damper. In this case, a second control valve is positioned at the oblique end section of the second overflow pipe to control the overflow of the damping medium through the second additional flow path. Compared to the first variant, the position of the second control valve in the longitudinal direction of the vibration damper can thus be designed more flexibly because the dependence of the control valve positioning on the extreme positions of the piston is eliminated.

[0012] In one particular implementation, the overflow pipes have their beveled end sections pointing towards each other. Axial space is saved by the staggering of the beveled end sections.

[0013] The overflow pipes do not need to be connected to each other. They are then sealed at the end sides of their beveled end sections. Therefore, the dimensions of the overflow pipes can be selected independently of each other.

[0014] Alternatively, the overflow pipes can be interconnected at the end sides of the beveled end sections, wherein the first and second additional flow paths provided by the overflow pipes are mutually sealed. Thus, the two overflow pipes can be combined into a pre-assembleable unit.

[0015] For sealing, a simple sealing ring can be arranged between the end faces of the beveled end sections, the sealing ring being inclined relative to the longitudinal axis of the vibration damper corresponding to the bevel of the end faces. This sealing ring seals both overflow pipes simultaneously. However, in such cases, each overflow pipe can also be sealed separately by its own sealing ring.

[0016] In particular, overflow pipes can have the same inner and outer diameters, as well as opposite beveled angles at their beveled end sections, and be arranged coaxially with each other. Therefore, overflow pipes can be simply cut to a certain length from the pipe material. If necessary, the corresponding beveled ends can even be manufactured in the same cut.

[0017] Furthermore, it is possible for the two overflow pipes to be manufactured as a single piece, i.e., as a pipe fitting, and for a sealing device to be installed within such a one-piece overflow pipe, with respect to the longitudinal axis of the vibration damper relative to the inner pipe, the sealing device simultaneously separating two additional flow paths. Two control valves are arranged at the height of the inclined sealing device to control the overflow of the damping medium through the respective additional flow paths; specifically, the first control valve connects the first additional flow path within the overflow pipe to the compensation chamber, and the second control valve connects the second additional flow path within the overflow pipe to the compensation chamber.

[0018] The control valves can be arranged on opposite sides of the container tube, more precisely at the same height in the longitudinal direction of the vibration damper or at a smaller axial offset. The staggered arrangement of the beveled end sections tends to allow this offset compared to the intermediate ring as in DE 100 25 399 A1.

[0019] For example, the control valve for the additional flow path can be configured such that a softer damper characteristic curve in the tensile stage is obtained by opening the first control valve in the tensile stage, and a softer damper characteristic curve in the pressure stage is obtained by opening the second control valve in the pressure stage. Attached Figure Description

[0020] The invention will now be explained in more detail with reference to the embodiments shown in the drawings. The drawings are as follows:

[0021] Figure 1 A schematic diagram of a hydraulic circuit for a vibration damper according to the present invention is shown.

[0022] Figure 2 A side view of a first embodiment of the vibration damper according to the present invention is shown, and

[0023] Figure 3 A side view of a second embodiment of the vibration damper according to the present invention is shown. Detailed Implementation

[0024] Figure 1 A schematic diagram of a hydraulic circuit for a vibration damper 1 according to the present invention is shown, which is used, for example, in a motor vehicle wheel suspension. Figure 2 and Figure 3 An embodiment of a vibration damper 1 configured as shown is illustrated, wherein the same components in both embodiments are provided with the same reference numerals.

[0025] The vibration damper 1 includes an outer container tube 2, within which an inner tube 3 is arranged. A compensation chamber AGK for containing a liquid damping medium exists between the inner circumference of the container tube 2 and the outer circumference of the inner tube 3.

[0026] A piston 4 is axially movable within the internal space of the inner tube 3. The piston 4 divides the internal space of the inner tube 3 into a first working chamber AK1 and a second working chamber AK2. Here, it is sealed relative to the inner wall of the inner tube 3 by means of a sliding seal.

[0027] A piston valve device 5 is arranged at piston 4. This piston valve device is constructed to allow overflow of the damping medium between the first working chamber AK1 and the second working chamber AK2 during the tension and pressure phases of the vibration damper 1. The piston valve device 5 can be formed by one or more valves of a conventional structural type. Currently, in Figure 1 The examples depict spring-loaded check valves 5a and 5b for the tension and pressure phases, respectively, which can be implemented as disc valves, for example. However, other valve shapes are also possible in this regard.

[0028] Furthermore, a bottom valve device 6 is provided, which connects the second working chamber AK2 to the compensation chamber AGK, so as to enable the overflow of the damping medium between the second working chamber AK2 and the compensation chamber AGK during the tension and pressure phases of the vibration damper 1. The bottom valve device 6 may be similar to the piston valve device 5, formed by one or more, for example, spring-loaded valves 6a and 6b.

[0029] Furthermore, the compensation chamber AGK can be hydraulically connected to the first working chamber AK1, which is located away from the bottom valve, if necessary. This hydraulic connection 7 can be made, for example, via a piston rod guide device 8, which closes the container tube 2 on the side of the piston rod 8a exiting the container tube 2.

[0030] The first damper characteristic curves for the tension and pressure phases of the vibration damper 1 are determined by the valves of the piston valve device 5 and the bottom valve device 6, and these first damper characteristic curves are generated by the opening behavior of the valves.

[0031] The basic characteristics of the vibration damper 1 can now be altered as needed via additional flow paths Ü1 and Ü2 and electrically operable first and second control valves 9 and 10 arranged therein. By opening the additional flow paths Ü1 and Ü2, softer damper characteristic curves can be obtained, wherein the characteristic curves can be designed independently of each other in terms of tensile stiffness and compressive stiffness via the first and second control valves 9 and 10.

[0032] Therefore, the first control valve 9 and the second control valve 10 are operated via a controller (not shown in more detail). For example, the control valves can be implemented as electrically operable proportional flow regulating valves. In particular, the first control valve 9 and the second control valve 10 can each be implemented as check valves that block flow in the opposite direction.

[0033] like Figure 1 As shown, the first control valve 9 in the control valve is currently arranged in the first additional flow path Ü1 from the first working chamber AK1 to the compensation chamber AGK. In the case of the vibration damper 1 shown, its operation affects the damper characteristic curve during the tension phase.

[0034] The second control valve 10 in the control valve controls the flow rate of the damping medium through the second additional flow path Ü2 from the second working chamber AK2 to the compensation chamber AGK. In the case of the vibration damper 1 shown, the damper characteristic curve is affected by manipulating the second control valve 10 during the pressure phase.

[0035] By opening the first control valve 9 during the tension phase, a relatively soft damper characteristic curve for the tension phase is obtained. By opening the second control valve 10, a softer damper characteristic curve for the pressure phase is obtained. When the first control valve 9 and the second control valve 10 are closed, the stiffest damper characteristic curves are obtained in the tension or pressure phase, respectively. Because the first control valve 9 and the second control valve 10 allow flow in only one direction but block flow in the opposite direction, the characteristic curve behavior in the tension and pressure phases can be modeled independently of each other via two additional flow paths Ü1 and Ü2.

[0036] like Figure 2 As shown, to form a first additional flow path Ü1 from the first working chamber AK1 to the compensation chamber AKG, a first overflow pipe 11 is arranged between the inner tube 3 and the container tube 2. The inner tube 3 has a first radial opening 12 through which the damping medium can be extruded from the first working chamber AK1 in the tension stage into the first additional flow path Ü1. In this case, the damping medium flows through an annular gap formed between the outer circumference of the inner tube 3 and the inner circumference of the first overflow pipe 11, and this annular gap currently serves as the first additional flow path Ü1.

[0037] The annular gap is axially sealed in two directions (i.e., not only in the direction of the piston rod guide 8 but also in the direction of the bottom valve device 6) along the longitudinal direction A of the vibration damper 1. However, the second radial opening 13 of the first overflow pipe 11 allows the damping medium to overflow into the compensation chamber AGK. The first control valve 9 is arranged at the location of the second radial opening 13 to control the overflow into the compensation chamber AGK.

[0038] As from Figure 2 As can be seen, the first overflow pipe 11 has a first end section 16 obliquely cut about the longitudinal axis A of the vibration damper 1. Figure 2 In the side view shown, the first overflow pipe 11 extends further downward on one side of the inner pipe 3 than on the opposite side. Furthermore, in Figure 2 The tilt angle α relative to the longitudinal axis A of the vibration damper 1 is shown in the figure. This tilt angle α is preferably in the range of 30° to 60°, and more preferably 45°. This results in a first end side 17 of the first overflow pipe 11 being positioned at a corresponding tilt relative to the longitudinal axis A of the vibration damper 1.

[0039] The first control valve 9 is radially positioned at the oblique first end section 16. Correspondingly, the second radial opening 13 is radially outwardly located at the oblique first end section 16. Meanwhile, the second control valve 10 is arranged at the height of the oblique first end section 16 about the longitudinal axis A of the vibration damper 1.

[0040] The sections of the first control valve 9 and the second control valve 10 protrude radially outward from the container tube 2. The latter has a corresponding opening 15 for the first control valve 9 and a corresponding opening 24 for the second control valve 10.

[0041] According to Figure 2 In the first embodiment, a second overflow pipe 18 is arranged between the inner pipe 3 and the container pipe 2 to provide a second additional flow path Ü2. The second additional flow path Ü2 extends from the second working chamber AK2 to the compensation chamber AGK. For this purpose, a third radial opening 19 is constructed at the inner pipe 3, which opens into the annular gap formed between the outer circumference of the inner pipe 3 and the inner circumference of the second overflow pipe 18.

[0042] The second overflow pipe 18 also has a second end section 20 obliquely cut with respect to the longitudinal axis A of the vibration damper 1. The annular gap extends accordingly to this oblique second end section 20. There, the second control valve 10 is also radially positioned at the second overflow pipe 18 to control the overflow of the damping medium through the second additional flow path Ü2. The second overflow pipe 18 correspondingly has a fourth radial opening 22 for the second control valve 10.

[0043] The section of the second control valve 10 protrudes radially outward from the container tube 2, for which a corresponding opening 24 is constructed, through which the section of the second control valve 10 is guided outward.

[0044] The obliquely cut second end section 20 of the second overflow pipe 18 points towards the obliquely cut first end section 16 of the first overflow pipe 11, and the oblique cut of the second overflow pipe 18 can be made at the same angle α as that at the first overflow pipe 11. The correspondingly obliquely positioned second end side 21 of the second overflow pipe 18 preferably extends parallel to the first end side 17 of the first overflow pipe 11, such that, as this... Figure 2 As shown, the obliquely cut first end segment 16 and obliquely cut second end segment 20 can be interleaved.

[0045] The first overflow pipe 11 and the second overflow pipe 18 may not be connected to each other, i.e., they do not contact each other. The corresponding first end sides 17 and 21 of the beveled first end section 16 and the beveled second end section 20 are sealed relative to the compensation chamber AGK, for example, by means of corresponding sealing rings between the inner circumferences of the first overflow pipe 11 and the second overflow pipe 18 and the outer circumference of the inner tube 3. Therefore, a small axial gap can be provided between the first end sides 17 and 21 if necessary. Alternatively, the first end sides 17 and 21 of the first overflow pipe 11 and the second overflow pipe 18 can be axially supported by each other.

[0046] Furthermore, the first overflow pipe 11 and the second overflow pipe 18 can be connected to each other, for example, by welding, at the first end side 17 and the second end side 21 of the obliquely cut first end section 16 and the obliquely cut second end section 20, while ensuring that the first additional flow path Ü1 and the second additional flow path Ü2 provided by the first overflow pipe 11 and the second overflow pipe 18 are mutually sealed.

[0047] Therefore, if necessary, a sealing gasket 23 can be arranged between the first end side 17 and the second end side 21 of the obliquely cut first end section 16 and the obliquely cut second end section 20, the sealing gasket being inclined relative to the longitudinal axis A of the vibration damper 1. Alternatively, as mentioned above, the first overflow pipe 11 and the second overflow pipe 18 can also be sealed separately toward the inner pipe by means of their own sealing rings.

[0048] According to Figure 2 In the illustrated embodiment, the first overflow pipe 11 and the second overflow pipe 18 have the same inner and outer diameters. Therefore, they can be cut from the same pipe material to a certain length.

[0049] Furthermore, the first overflow pipe 11 and the second overflow pipe 18 may optionally have the same tilt angle α at their oblique first end section 16 and oblique second end section 20, i.e., manufactured by cutting.

[0050] Preferably, the first overflow pipe 11 and the second overflow pipe 18 are arranged coaxially with each other.

[0051] In particular, the first overflow pipe 11 and the second overflow pipe 18 can be implemented as pre-assembled structural units that already include separation portions for the two additional flow paths Ü1 and Ü2, for example in the form of inserted sealing gaskets 23.

[0052] The above configuration enables the first control valve 9 and the second control valve 10 to be installed at the same height or with only a small axial offset on opposite sides of the container pipe 2, wherein they can be directly connected to the openings 13 or 22 of the corresponding first overflow pipe 11 and second overflow pipe 18, respectively.

[0053] Due to the main outer arrangement of the first control valve 9 and the second control valve 10, the container tube 2 can be implemented in a very slender manner. The arrangement of the first control valve 9 and the second control valve 10 at approximately the same height, but facing each other at the outer circumference of the container tube 2, still allows for packaging that is conducive to installation in the suspension of a motor vehicle wheel.

[0054] In particular, the first control valve 9 and the second control valve 10 can be arranged in the area near the wheel on the outer circumference of the vibration damper 1, that is, near the bottom valve device 6.

[0055] By using the second overflow pipe 18, the positioning of the first control valve 9 and the second control valve 10 is independent of the positions of the first radial opening 12 and the third radial opening 19 of the inner tube 3, opposite to the extreme position of the piston 4.

[0056] In principle, by using the first overflow pipe 11 and the second overflow pipe 18, the positions D of the first control valve 9 and the second control valve 10 in the longitudinal direction A of the vibration damper 1 can be selected very freely.

[0057] Preferably, the arrangement is carried out at the height between the first radial opening 12 and the third radial opening 19 of the inner tube 3, and more preferably in the lower third of the spacing between these openings 12 and 19, wherein the valve center M is used as a reference for the position of the first control valve 9 and the second control valve 10.

[0058] In a preferred variant, the valve center M of the second control valve 10 is located above the center of the first radial opening 12.

[0059] Based on the above... Figure 2 In a modified embodiment, the first overflow pipe 11 and the second overflow pipe 18 can be manufactured as a single piece, i.e., as a pipe fitting. In this case, to achieve axial staggering of the two additional flow paths Ü1 and Ü2, a sealing device is arranged obliquely relative to the inner pipe 3 about the longitudinal axis A of the vibration damper 1 within the one-piece overflow pipe. This sealing device simultaneously separates the two additional flow paths Ü1 and Ü2 from each other. The first control valve 9 and the second control valve 10 are arranged at the height of the obliquely arranged sealing device to control the overflow of the damping medium through the corresponding additional flow path Ü1 or Ü2. The first control valve 9 connects the first additional flow path Ü1 within the one-piece overflow pipe to the compensation chamber AGK, and the second control valve 10 connects the second additional flow path Ü2 within the overflow pipe to the compensation chamber AGK.

[0060] Figure 3 A simplified implementation variation of the first embodiment is shown in the form of a second embodiment. In this case, the second overflow pipe 18 is omitted.

[0061] In order to provide a second additional flow path Ü2, Figure 3 In this configuration, the inner tube 3 has only a third radial opening 19 between the second working chamber AK2 and the compensation chamber AGK. The second control valve 10 is placed directly at this third radial opening 19 and thus controls the overflow of the damping medium into the compensation chamber AGK.

[0062] The invention has been explained in more detail above with reference to different embodiments and variations. These embodiments and variations serve to demonstrate the feasibility of the invention. The individual technical features explained above in the context of other individual features can also be implemented independently of them, as well as in combinations with other individual features, even if not explicitly described, provided that this is technically possible. Therefore, the invention is explicitly not limited to the specifically described embodiments, variations, and modifications, but includes all designs defined by the invention.

[0063] List of reference numerals

[0064] 1. Vibration damper

[0065] 2. Container tube

[0066] 3. Inner tube

[0067] 4 Pistons

[0068] 5. Piston valve equipment (passive)

[0069] 5a Piston Valve

[0070] 5b Piston Valve

[0071] 6. Bottom valve equipment

[0072] 6a Bottom Valve

[0073] 6b Bottom Valve

[0074] 7 Connections

[0075] 8 Piston rod seal

[0076] 8a Piston Rod

[0077] 9. First control valve (electrically operated)

[0078] 10. Second control valve (electrically operated)

[0079] 11 First overflow pipe

[0080] 12 First radial opening

[0081] 13 Second radial opening

[0082] 15 Openings

[0083] 16. The first end section cut at an angle

[0084] 17 First end side

[0085] 18 Second overflow pipe

[0086] 19 Third radial opening

[0087] 20. The second end section with a beveled cut.

[0088] 21 Second end side

[0089] 22 Fourth radial opening

[0090] 23 Sealing gaskets

[0091] 24 Opening

[0092] α Inclination angle

[0093] A. Longitudinal axis

[0094] AK1 First Working Chamber

[0095] AK2 Second Working Chamber

[0096] AGK Compensation Chamber

[0097] M Valve Center (Regarding the closing function of the relevant valve body)

[0098] Ü1 First Additional Flow Path

[0099] Ü2 Second Additional Flow Path

Claims

1. A vibration damper (1) comprising a container tube (2), an inner tube (3), a piston (4), a piston valve device (5), a bottom valve device (6), a first overflow pipe (11), an electrically operable first control valve (9), and an electrically operable second control valve (10), wherein, The inner tube (3) is arranged in the container tube (2). The piston (4) is axially movable within the inner tube (3) and divides the internal space of the inner tube (3) into a first working chamber (AK1) and a second working chamber (AK2). The piston valve device (5) is arranged at the piston (4) and configured such that the damping medium can overflow between the first working chamber (AK1) and the second working chamber (AK2) during the tension and pressure phases of the vibration damper (1). A compensation chamber (AGK) is provided between the inner circumference of the container tube (2) and the outer circumference of the inner tube (3). The bottom valve device (6) connects the second working chamber (AK2) to the compensation chamber (AGK) so that the damping medium can overflow between the working chamber (AK2) and the compensation chamber (AGK) during the tension and pressure phases of the vibration damper (1). The first overflow pipe (11) is arranged between the inner pipe (3) and the container pipe (2) and provides a first additional flow path (Ü1) from the first working chamber (AK1) to the compensation chamber (AGK). The first control valve (9) works in conjunction with the first additional flow path (Ü1) to control the overflow of the damping medium through the first additional flow path (Ü1). The second control valve (10) works in conjunction with a second additional flow path (Ü2) from the second working chamber (AK2) to the compensation chamber (AGK) to control the overflow of the damping medium through the second additional flow path (Ü2), and The sections of the first control valve (9) and the second control valve (10) protrude radially outward from the container tube (2). Its features are, The first overflow pipe (11) has a first end section (16) obliquely cut about the longitudinal axis (A) of the vibration damper (1). The first control valve (9) is placed at the first end section (16) of the bevel, and the second control valve (10) is arranged at the height of the first end section (16) of the bevel about the longitudinal axis (A) of the vibration damper (1).

2. The vibration damper (1) according to claim 1, characterized in that, In order to provide the second additional flow path (Ü2), the inner tube (3) forms a third radial opening (19) between the second working chamber (AK2) and the compensation chamber (AGK), and the second control valve (10) is placed at the third radial opening (19).

3. The vibration damper according to claim 1, characterized in that, A second overflow pipe (18) is arranged between the inner pipe (3) and the container pipe (2) and provides a second additional flow path (Ü2) from the second working chamber (AK2) to the compensation chamber (AGK), wherein the second overflow pipe (18) has a second end section (20) obliquely cut about the longitudinal axis (A) of the vibration damper (1), and the second control valve (10) is placed at the oblique second end section (20) of the second overflow pipe (18) to control the overflow of the damping medium through the second additional flow path (Ü2).

4. The vibration damper according to claim 3, characterized in that, The first overflow pipe (11) and the second overflow pipe (18) point to each other with their oblique first end section (16) and oblique second end section (20).

5. The vibration damper according to claim 4, characterized in that, The first overflow pipe (11) and the second overflow pipe (18) are not connected to each other and are sealed at the first end side (17) and the second end side (21) of the oblique first end section (16) and the oblique second end section (20).

6. The vibration damper according to claim 4, characterized in that, The first overflow pipe (11) and the second overflow pipe (18) are connected to each other at the first end side (17) and the second end side (21) of the oblique first end section (16) and the oblique second end section (20), and the first additional flow path (Ü1) and the second additional flow path (Ü2) provided by the first overflow pipe (11) and the second overflow pipe (18) are mutually sealed.

7. The vibration damper according to claim 4 or 6, characterized in that, A sealing gasket (23) is arranged between the first end side (17) and the second end side (21) of the oblique first end section (16) and the oblique second end section (20), the sealing gasket being arranged obliquely relative to the longitudinal axis (A) of the vibration damper (1).

8. The vibration damper according to any one of claims 3 to 6, characterized in that, The first overflow pipe (11) and the second overflow pipe (18) have the same inner diameter and outer diameter and the same tilt angle (α) at ​​their oblique first end section (16) and oblique second end section (20) and are arranged coaxially with each other.

9. The vibration damper according to any one of claims 1 to 6, characterized in that, The first control valve (9) and the second control valve (10) are arranged on opposite sides of the container tube (2).

10. A vibration damper (1) comprising a container tube (2), an inner tube (3), a piston (4), a piston valve device (5), a bottom valve device (6), a first overflow pipe (11), an electrically operable first control valve (9), and an electrically operable second control valve (10), wherein, The inner tube (3) is arranged in the container tube (2). The piston (4) is axially movable within the inner tube (3) and divides the internal space of the inner tube (3) into a first working chamber (AK1) and a second working chamber (AK2). The piston valve device (5) is arranged at the piston (4) and configured such that the damping medium can overflow between the first working chamber (AK1) and the second working chamber (AK2) during the tension and pressure phases of the vibration damper (1). A compensation chamber (AGK) is provided between the inner circumference of the container tube (2) and the outer circumference of the inner tube (3). The bottom valve device (6) connects the second working chamber (AK2) to the compensation chamber (AGK) so that the damping medium can overflow between the working chamber (AK2) and the compensation chamber (AGK) during the tension and pressure phases of the vibration damper (1). The first overflow pipe (11) is arranged between the inner pipe (3) and the container pipe (2) and provides a first additional flow path (Ü1) from the first working chamber (AK1) to the compensation chamber (AGK). The first control valve (9) works in conjunction with the first additional flow path (Ü1) to control the overflow of the damping medium through the first additional flow path (Ü1). The second control valve (10) works in conjunction with a second additional flow path (Ü2) from the second working chamber (AK2) to the compensation chamber (AGK) to control the overflow of the damping medium through the second additional flow path (Ü2), and The sections of the first control valve (9) and the second control valve (10) protrude radially outward from the container tube (2). Its features are, The second overflow pipe (18) further provides a second additional flow path (Ü2) from the second working chamber (AK2) to the compensation chamber (AGK), wherein a sealing device obliquely positioned about the longitudinal axis (A) of the vibration damper (1) is arranged between the first additional flow path (Ü1) and the second additional flow path (Ü2), and The first control valve (9) and the second control valve (10) are arranged at the height of the inclined sealing device in order to control the overflow of the damping medium through the corresponding additional flow paths (Ü1, Ü2).

11. The vibration damper according to claim 10, characterized in that, The first control valve (9) and the second control valve (10) are arranged on opposite sides of the container tube (2).

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