Control assembly for frequency-dependent damping valve device of vibration damper and method for producing such control assembly

Abstract

The invention relates to a control assembly for a frequency-dependent damping valve device of a shock absorber, comprising: a control bowl having a cylindrical bowl wall and an annular bowl bottom; a control piston which is arranged in the control bowl so as to be axially displaceable relative to the main axis between a first end position and a second end position and which together with the control bowl defines a control chamber, the bowl bottom having a deformation section produced by plastic deformation, which in the first end position defines an axial end stop of the control piston; a guide sleeve coaxially passing through the control piston, the control piston being slidably guided on an outer side surface of the guide sleeve, the deformation section defining a groove in which the guide sleeve is partially received with a first axial end; the elastic unit is axially supported on the control piston relative to the main shaft and applies elastic force to the control piston, the guide sleeve is provided with a concave part arranged in the groove at the first axial end part, and the base material of the bowl bottom is extruded into the concave part through plastic deformation to form a shape matching connection part.

Description

Technical Field

[0001] The invention relates to a control assembly for a frequency-dependent damping valve arrangement of a vibration absorber, the control assembly having the features of the preamble of claim 1. The invention also relates to a method for producing the control assembly. Background Art

[0002] In the vehicle sector in particular, shock absorbers are often used in conjunction with suspension systems in the vehicle chassis. Such shock absorbers are usually formed by at least one damper tube and a piston rod that is movable relative thereto, which hydraulically damp each other via a piston valve. For this purpose, the piston valve is arranged at the lower end of the piston rod and divides the interior of the damper tube into two working chambers. In order to control the damping force of the impact damper, a frequency-dependent damping valve is used, wherein the flow direction of the oil flow in the impact damper can be changed or the flow of the oil flow can be blocked as required, so that the damping force can be adjusted depending on the movement frequency of the vehicle.

[0003] Patent document DE 10 2015 220 707 A1 discloses a control assembly for a frequency-dependent damping valve device of a shock absorber, which comprises a control bowl and a control piston arranged axially displaceably in the control bowl. The control piston axially delimits a control chamber enclosed in the control bowl, which is connected to the damping valve device via an input connection. An elastic element is arranged between the control piston and the damping valve, which on the one hand axially introduces an elastic force into the control piston and on the other hand axially introduces an elastic force into the damping valve. If the control chamber is filled with a damping fluid, the control piston moves toward the damping valve and increases the contact force of the valve disk of the damping valve via the elastic element, which increases the damping force. The control component is characterized in that the axial position of the stop portion in the control component is adjusted by plastic deformation of the bowl bottom, wherein the bowl bottom has a deformation section formed by plastic deformation and having a groove, the groove partially accommodating the guide sleeve, and wherein the cross-section of the groove corresponds to the outer cross-section of the section of the guide sleeve accommodated in the groove. Summary of the invention

[0004] The object of the present invention is to provide a control assembly of the type mentioned at the outset, which is characterized by a high degree of functional reliability. It is also an object of the present invention to specify a method for producing such a control assembly.

[0005] According to the invention, this object is achieved by a control arrangement having the features of claim 1 and by a method having the features of claim 14. Advantageous embodiments are disclosed in the dependent claims, the drawing and / or the description.

[0006] The subject of the invention is a control assembly which is designed and / or suitable for a frequency-dependent damping valve arrangement of a shock absorber. Preferably, the damping valve arrangement has a damping piston which is movably coupled to a piston rod, the damping piston comprising a rebound damping valve acting in the pulling direction of the piston rod for generating a damping force during the extension, i.e., in the pulling phase, and / or comprising a compression damping valve acting in the compression direction of the piston rod for generating a damping force during the insertion, i.e., in the compression phase. In particular, the control assembly is used to generate a damping force which is speed- and / or frequency-dependent. For this purpose, the control assembly is operatively connected to one of the damping valves, in particular to the rebound damping valve. For this purpose, the damping valve is equipped with at least one valve disk which is influenced by the control assembly in a frequency-dependent manner. Thus, the frequency-dependent damping valve arrangement is formed by a damping valve and a control assembly which acts on the damping valve in a frequency-dependent manner.

[0007] The control assembly has a control bowl, which has a cylindrical bowl wall and an annular bowl bottom adjacent to the bowl wall. In simple terms, the control bowl is configured as a cylindrical bowl, wherein the bowl bottom has a central through hole for guiding the piston rod through. Preferably, the bowl wall and the bowl bottom are formed from a common material section, in particular in one piece.

[0008] The control assembly has a control piston which is arranged in a control bowl in such a way that it can be axially displaced between a first end position and a second end position relative to the main axis and delimits a control chamber enclosed in the control bowl in the axial direction. The control chamber is preferably filled with a damping medium via at least one or exactly one control channel depending on the excitation frequency, whereby the control piston is displaced and the pressure acting on the valve disk of the damping valve is at least indirectly increased or reduced. The control piston thus acts on the valve disk in the closing direction of the valve disk. The control piston preferably bears against the bowl wall in a sealing manner in the radial direction, for example via at least one sealing ring. In particular, the main axis is defined by the longitudinal axis of the piston rod.

[0009] The bowl bottom has a deformation section manufactured by plastic deformation, which defines at least one or exactly one axial end stop for the control piston in the first end position. In particular, the axial position of the end stop is set and / or adjustable by the plastic deformation of the bowl bottom. In short, the end stop defines the maximum axial stroke of the control piston in the control bowl in the direction of the bowl bottom. The end stop is preferably configured as an at least partially axially protruding protrusion of the bowl bottom. Soft and / or hard damping force characteristic curves can be achieved by limiting the axial stroke of the control piston in the control bowl. In particular, when the control piston is arranged in the first end position, a soft damping force characteristic curve is generated. Optionally, the control assembly can have another end stop for the control piston in the second end position, which defines the maximum axial stroke of the control piston in the control bowl in the direction of the valve disc of the damping valve. The damping force characteristic curve generated in this state is called a hard damping force characteristic curve.

[0010] The control assembly has a guide sleeve, which is guided through the control piston coaxially with respect to the main axis, wherein the control piston is guided slidingly on the side surface of the guide sleeve. In other words, the control piston surrounds the guide sleeve in the circumferential direction.

[0011] Preferably, the other end stop is arranged and / or constructed on the guide sleeve. For this purpose, the guide sleeve can have a radial shoulder that defines the other end stop. Alternatively or in addition, the other end stop can be formed by an axially fixed stop ring around the guide sleeve. In particular, the guide sleeve and the control bowl are arranged coaxially with respect to the main axis. In short, the control piston is constructed as an annular piston with a central through hole for guiding the piston rod through.

[0012] The deformation section defines a groove in which the guide sleeve is partially accommodated with a first axial end. In particular, the guide sleeve is coaxially centered in the groove relative to the main axis. The guide sleeve can be accommodated in the groove in a form-fitting manner relative to the main axis axially in the direction of the bowl bottom and radially in the direction of the bowl wall. In other words, the cross-section of the groove is equivalent to the outer cross-section of the axial end of the guide sleeve accommodated in the groove. In the case of correct installation, the piston rod is guided through the guide sleeve, wherein the guide sleeve is axially fixed to the damping valve, in particular to its valve disk, on the one hand, and axially fixed to the fixing member, for example, to the fixing nut, on the other hand. In particular, the at least one control channel is at least partially constructed between the guide sleeve and the control piston.

[0013] In addition, the control assembly has an elastic unit, which is axially supported on the control piston relative to the main axis and exerts a defined elastic force on the control piston in the direction of the bowl bottom. In the case of correct installation, the elastic unit is arranged between the control piston and the valve disc of the damping valve, wherein the control assembly is designed so that the control piston is displaced relative to the valve disc of the damping valve according to the damping fluid pressure in the control chamber, the elastic unit is loaded or relaxed, and the elastic force exerted by the elastic unit on the valve disc and thus the damping force of the damping valve is influenced. In particular, the elastic unit can include at least one or exactly one elastic element, which can be designed as a helical spring or an elastic disc, for example. The elastic unit generally includes at least two elastic elements, wherein at least one or exactly one annular spacer element can be arranged between the elastic elements. The axial extension of the spacer element preferably influences the preloading of the elastic unit.

[0014] It is proposed within the scope of the invention that the guide sleeve has at least one or exactly one recess at the first axial end in the region of the groove, into which recess the base material of the control bowl is displaced by plastic deformation to form a positive connection. In particular, the positive connection serves to ensure that the control bowl is fixed to the guide sleeve in an axial direction relative to the main axis in a captive manner. The recess is preferably arranged axially in the groove so that the base material partially flows into the recess during the plastic deformation. In simple terms, a portion of the deformed material of the bowl bottom is thereby displaced into the recess, so that force transmission takes place by means of the positive connection.

[0015] The invention is based on the recognition that during the production of the control assembly, a shearing process (plastic deformation) of the control bowl is carried out by a sharp-edged tool. The main purpose of this shearing process is to define the "starting position" (end stop) operating point of the control piston. In addition, the control bowl is fixed to the guide sleeve by this shearing process. If the control bowl is separated from the guide sleeve, the function of the control assembly is no longer ensured, which is why such a control assembly is scrapped.

[0016] The invention has the advantage that, by forming the recess on the guide sleeve, the control bowl can be easily and permanently fixed to the guide sleeve by means of plastic deformation. Since plastic deformation of the bowl bottom occurs anyway during the manufacturing process, the control bowl can also be fixed particularly cost-effectively by means of the recess. The function of the control assembly can be ensured during the entire manufacturing process and assembly process of the vibration damper by means of the positive connection, thereby increasing the functional reliability of the vibration damper.

[0017] In a specific design, it is proposed that the control bowl, the control piston, the guide sleeve and the elastic unit are held together in a pre-assembled state by a form-fitting connection to form a common structural unit. During the manufacturing process, the elastic unit of the control piston and the control bowl are coaxially pushed onto the guide sleeve in sequence, wherein the bowl bottom is then plastically deformed by means of a deformation tool to determine the end stop and form a form-fitting connection. In particular, the control piston and the elastic unit are axially secured against disengagement on the guide sleeve relative to the main axis by the control bowl. The form-fitting connection is particularly preferably used as a transport securing portion of the pre-assembled control assembly. In other words, the control bowl, the control piston, the guide sleeve and the elastic unit form a self-retaining assembly. Therefore, the control assembly can be provided as a pre-assembled structural unit, thereby significantly improving the handling of the control assembly during the manufacturing process and the assembly process.

[0018] In another design, it is proposed that the control bowl is fixed to the guide sleeve without clearance in the radial direction and in the axial direction relative to the main axis by a form-fit connection. In particular, the recess is configured so that a form-fit connection is formed between the control bowl and the guide housing in the axial direction and in the opposite axial direction relative to the main axis. For this purpose, the substrate preferably flows radially inward into the recess during plastic deformation. In addition, a deformation section, preferably a groove, is formed on the outer contour of the guide sleeve so that it abuts against the axial end of the guide sleeve accommodated in the groove in a form-fitting and / or force-transmitting manner in the radial direction. By fixing the guide sleeve without clearance in the radial and axial directions, the axial end stop or the first end position of the control piston can be determined particularly accurately. In this case, it can also be ensured that the end stop is maintained during the entire assembly process.

[0019] In a specific embodiment, it is proposed that the at least one recess is formed by an undercut arranged in the groove. In particular, the control bowl is fixed axially in two directions relative to the guide sleeve by the undercut. In other words, the recess is delimited in the direction of the bowl bottom by a material protrusion having an undercut. As an example, when viewed in a longitudinal section relative to the main axis, the undercut can be wedge-shaped or essentially wedge-shaped. It is particularly preferred that the plastically deformed substrate fills most or all of the undercut. Therefore, the undercut ensures a particularly strong form-fitting connection in two axial directions relative to the main axis.

[0020] In an improved solution, it is proposed that the undercut has an axial surface extending in a radial plane of the main axis and an inclined surface arranged at an acute angle relative to the axial surface. In particular, the inclined surface is arranged at an angle less than 90° with the axial surface. Preferably, the angle is less than 80°, preferably less than 70°, and in particular less than 60°. As an alternative or optionally as a supplement, the inclined surface is inclined at an angle between 20° and 40° relative to the main axis. Preferably, the form-fitting connection of the plastically deformed substrate is formed by the axial surface in one axial direction and by the inclined surface in the other axial direction. Therefore, a particularly strong form-fitting connection between the control bowl and the guide sleeve can be ensured. In addition, the material flow during plastic deformation can be improved.

[0021] In a specific embodiment, it is proposed that the axial surface delimits the recess axially, in particular in the direction of the elastic component, wherein the undercut is formed by the inclined surface. In short, the inclined surface forms the undercut surface. Particularly preferably, during the plastic deformation, the material flow is introduced along the inclined surface into the recess and fills the undercut formed there. Thus, a reliable and permanent connection between the two components is ensured.

[0022] In a specific embodiment, it is proposed that the undercut is introduced into the axial end face of the guide sleeve, wherein a shearing edge is formed between the inclined surface and the end face. In particular, the recess formed thereby is open radially outward and axially in the direction of the bowl bottom. Preferably, the inclined surface connects the axial surface with the end face, wherein the shearing edge is formed by a transition portion between the inclined surface and the end face. In particular, during plastic deformation, the substrate can flow or be introduced into the recess via the shearing edge and along the inclined surface. Therefore, an undercut is proposed, which is arranged in close proximity to the bowl bottom, so that even if there is a slight plastic deformation of the bowl bottom, a shape-fitting connection between the bowl bottom and the guide sleeve can be ensured.

[0023] In an alternative embodiment, it is proposed that the inclined surface delimits the recess axially, in particular in the direction of the elastic component, wherein the undercut is formed by the axial surface. In short, the axial surface forms the undercut. Particularly preferably, during the plastic deformation, a material flow is introduced along the axial surface into the recess and fills the undercut formed there. This also ensures a reliable and permanent connection between the two components.

[0024] In a specific embodiment, it is proposed that the undercut is introduced into the side surface of the guide sleeve, wherein a shearing edge is formed between the axial surface and the side surface. In particular, the recess formed thereby is open radially outward and is slightly axially spaced apart from the bowl bottom. For example, the spacing distance is less than 0.2 mm, preferably less than 0.1 mm. Preferably, the axial surface connects the inclined surface to the side surface, wherein the shearing edge is formed by a transition portion between the axial surface and the side surface. In particular, during plastic deformation, the substrate can flow or be introduced into the recess via the shearing edge and along the axial surface. Therefore, an undercut is proposed, which is arranged in close proximity to the bowl bottom, so that even if the bowl bottom is slightly plastically deformed, a shape-fitting connection between the bowl bottom and the guide sleeve can be ensured.

[0025] In a further development, it is proposed that the axial surface and the inclined surface in the recess, in particular when viewed in a longitudinal section along the main axis, are connected to one another via a radius. As an example, the radius of the recess introduced into the end face is less than 0.01 mm, preferably less than 0.05 mm. As an example, the radius of the recess introduced into the side surface is less than 0.5 mm, preferably less than 0.2 mm. This radius can improve the material flow during plastic deformation and thus ensure that the recess or undercut is completely filled.

[0026] In a specific embodiment, it is proposed that the at least one recess is designed continuously in the circumferential direction. The recess is preferably designed as a groove around the main axis, preferably an annular groove. Thus, a recess is proposed, which ensures a particularly reliable form-fit connection between the control bowl and the guide sleeve. By means of the surrounding recess, the spring force exerted by the elastic component on the control piston can also be supported particularly firmly in the guide sleeve in the pre-assembled state, because the spring force is supported over the entire circumference.

[0027] In another embodiment, it is provided that the at least one recess is produced by machining. Preferably, the guide sleeve is designed as a turned part, wherein the recess, in particular the circumferential continuous recess, is produced by turning. Thus, a recess is provided which can be realized particularly easily and therefore cost-effectively in terms of production technology during the production process of the guide sleeve.

[0028] In another design, it is proposed that the guide sleeve has a radially outwardly directed form-fitting contour at the second axial end, and the elastic unit is axially supported relative to the main axis via the form-fitting contour. In particular, the form-fitting contour is used to axially retain the elastic unit and the control piston between the control bowl and the form-fitting contour in a pre-assembled state in a non-detachable manner. In particular, the form-fitting contour is formed by a flange, a collar, a flange, etc. extending around the main axis. In principle, the at least one elastic element can be directly supported on the form-fitting contour. Alternatively, the elastic unit has a supporting element, preferably a supporting disk, via which the elastic element is supported on the form-fitting contour. Therefore, the fixation of all components of the control assembly at the guide sleeve in the pre-assembled state is ensured in a simple and cost-effective manner.

[0029] Another subject of the invention relates to a method for producing the control assembly, as already described above, in which the elastic unit, the control piston and the control bowl are pre-assembled on the guide sleeve and the bowl bottom of the control bowl is plastically deformed in the axial direction relative to the main axis by means of a deformation tool, wherein the base material of the control bowl is displaced into the recess under the action of force to form a positive connection. Accordingly, the deformation tool has a contact section, which contacts the bowl bottom and performs a defined stroke in the direction of the guide sleeve parallel to the main axis under the action of force. As an example, the contact section is designed around the main axis and / or has an annular surface around the main axis. Preferably, the bowl bottom is plastically deformed in the region of the contact section, wherein the guide sleeve axially supports the bowl bottom on the side facing away from the deformation tool and serves as a support for the deformation tool. The deformation tool particularly preferably has a recess, wherein the cross section of the recess substantially corresponds to the outer contour of the first axial end of the guide sleeve. In particular, the control bowl, in particular the bowl bottom, is deformed and / or cold-formed by means of the deformation tool without cutting.

[0030] Alternatively, the control assembly can be fixed between the first component and the second component of the fixing device before the deformation process. The control assembly can be arranged as a structural unit between the first component and the second component, which comprises at least a guide sleeve and a control bowl and is loaded by introducing a fixing force. In this case, the guide sleeve rests axially against the bowl bottom relative to the main axis.

[0031] In a specific embodiment, it is proposed that the elastic unit and the control piston are pre-assembled on the guide sleeve in an intermediate step, and the guide sleeve is plastically deformed in the axial direction relative to the main axis by means of another deformation tool, wherein the base material of the guide sleeve is displaced radially outward under the action of force to form the transport locking portion. In particular, at least one, preferably three caulking portions are produced on the guide sleeve by the other deformation tool, which are used to axially fix the control piston on the guide sleeve. Therefore, the elastic unit and the control piston can be easily handled as a pre-assembled structural unit during the assembly process, especially on an assembly line. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Further features, advantages and effects of the present invention are derived from the following description of preferred embodiments of the present invention.

[0033] Figure 1 A cross-sectional view showing a damping valve device according to an embodiment of the present invention;

[0034] Figure 2 Shows Figure 1 Detailed diagram of the damping valve device in FIG.

[0035] Figure 3 Shows Figure 1 A detailed view of a guide sleeve of a control assembly of a damping valve device;

[0036] Figure 4 With Figure 3 The same figure shows an alternative embodiment of the guide sleeve.

[0037] Figure 5 Shows Figure 1 Cross-sectional view of the control component during the deformation process. DETAILED DESCRIPTION

[0038] Figure 1 A frequency-dependent damping valve device 1 for a motor vehicle shock absorber is shown. The damping valve device 1 is fixed at one end to a piston rod 2, in particular to a piston rod pin, and is arranged to be axially displaceable in a cylinder 3 of the shock absorber. As an example, the damping valve device 1 can be axially fixed to the piston rod 2 by a fixing nut (not shown). The piston rod 2 defines a main axis 100 with its longitudinal axis.

[0039] The damping valve device 1 has a damping piston 4 coaxially arranged with the main axis 100, which is sealed (e.g., by a piston seal) against the inner circumference of the cylinder 3 in the radial direction relative to the main axis 100, and divides the cylinder interior space of the cylinder 3 into a working chamber on the piston rod side and a working chamber away from the piston rod. The cylinder interior space is usually filled with a damping fluid.

[0040] The damping valve device 1 has at least one damping valve 5, preferably a rebound damping valve, which cooperates with a flow channel 6 formed in the damping piston 4. For this purpose, the damping valve 5 has at least one valve disk 7, which axially covers the flow channel 6. When the piston rod 2 is axially displaced relative to the cylinder 3, the damping fluid is displaced through the flow channel 6. This damping fluid flow is then weakened by the valve disk 7, wherein the damping force depends at least partially on the spring elasticity of the valve disk 7. The damping valve device 1 can also have another damping valve (not shown), preferably a compression damping valve, which cooperates with the damping piston 4 in the opposite flow direction of the damping fluid.

[0041] In addition, the damping valve device 1 includes a control assembly 8, which is arranged coaxially with the main axis 100 on the piston rod 2 on the side of the damping valve 5 facing away from the damping piston 4. The control assembly 8 includes a control bowl 9, which has a cylindrical bowl wall 11 and an annular disk-shaped bowl bottom 12 adjacent to the bowl wall 11. The bowl wall 11 and the bowl bottom 12 are manufactured from a common material section, for example by forming technology. As an example, the control bowl 9 is constructed as a sheet metal molded part.

[0042] The control assembly 8 has a control piston 10 which is axially displaceable in a control bowl 9 and is sealed against a bowl wall 11 by a sealing ring 13. The control piston 10 axially delimits a control chamber 14 enclosed in the control bowl 9 and which is fluidically connected to the working chamber of the cylinder 3 on the piston rod side via a further flow channel 15.

[0043] The control assembly 8 has an elastic unit 16, which is arranged axially between the control piston 10 and the damping piston 4. The elastic unit 16 is configured to exert an elastic force on the control piston 10 on the one hand and on the at least one valve disk 7 on the other hand. During the pulling movement 101 of the piston rod 2, part of the damping fluid flows into the control chamber 14 through the further flow channel 15, thereby axially pushing the control piston 10 in the direction of the damping valve 5, and the elastic force of the elastic unit 16 increases. This increases the pressing force of the valve disk 7, which in turn causes the damping force to increase.

[0044] The elastic unit 16 comprises a plurality of elastic elements 17, 18, wherein a sleeve-shaped spacer element 19 is arranged between the elastic elements 17, 18. As an example, the elastic elements 17, 18 are each formed by at least one elastic disk. In addition, the elastic unit 16 has a support element 20 configured as a support disk, by which the elastic component 16 is axially supported on the valve disk 7. For this purpose, the support element 20 is axially supported between the valve disk 7 and the elastic element 17.

[0045] The control assembly 8 also has a guide sleeve 21 on which the control piston 10 and the elastic unit 16 are coaxially arranged or guided. The guide sleeve 21 passes through the control piston 10 and the elastic unit 16 and when the control piston 10 is axially displaced relative to the main axis 100, the control piston and the elastic unit are slidably guided on the outer surface 22 of the guide sleeve 21.

[0046] The bowl bottom 12 of the control bowl 9 has an axial end stop 23 which defines a first axial end position 102 of the control piston 10. The end stop 23 serves as an axial stop for the control piston 10, whereby an axial movement of the control piston 10 in the direction of the bowl bottom 12 is limited and a soft damping force characteristic curve is influenced. For this purpose, the end stop 23 is designed as an at least partial projection of the bowl bottom 12.

[0047] Furthermore, the guide sleeve 21 has a further axial end stop 24 which defines a second axial end position 103 of the control piston 10. The further end stop 24 serves as a further axial stop for the control piston 10, whereby an axial displacement of the control piston 10 in the direction of the valve disk 7 is limited and a hard damping force characteristic curve is influenced. The further end stop 24 is formed by a radial shoulder formed on the guide sleeve 21 and on which at least one stop disk 25 is axially supported.

[0048] In order to adjust the axial end stop 24, the bowl bottom 12 has a deformation section 26 produced by plastic deformation, by which a groove 27 is formed. A first axial end 28 of the guide sleeve 21 facing away from the damping piston 4 is partially accommodated in the groove 27, wherein the guide sleeve 21 is fixed to the guide sleeve 21 in the groove 27 by a form-fit connection 30.

[0049] like Figure 2 As shown, the guide sleeve 21 has a recess 31 in the region of the groove 27, into which the base material of the bowl bottom 12 is pressed during the plastic deformation to form a positive connection 30. For this purpose, the bowl bottom 12 can be irreversibly plastically deformed and has a lower yield point than the guide sleeve 21. The base material of the bowl bottom 12 that is displaced due to the plastic deformation is completely accommodated in the recess 27. The control bowl 9 is thus fixed in a radial direction by the groove 27 and in an axial direction by the positive connection 30 to the first axial end 28 of the guide sleeve 21 in a captive manner, preferably without play, relative to the main axis 100.

[0050] In order to further axially fix the control piston 10 and the elastic unit 16, the guide sleeve 21 has a form-fitting contour 40 at the second axial end 29 facing the damping piston 4, against which the support element 20 is axially supported in the direction of the damping piston 5. The form-fitting contour 40 is formed by a radially enlarged diameter, in particular a radially outwardly directed flange.

[0051] The control bell 9 , the control piston 10 , the spring unit 16 and the guide sleeve 21 are held together in the pre-assembled state to form a common structural unit by means of the form-fitting connection 30 at the first end 28 and the form-fitting contour 40 at the second end 29 .

[0052] like Figure 3 and Figure 4 As shown, the recess 31 is formed by an undercut 32 arranged in the groove 27, which is formed, for example, circumferentially on the guide sleeve 21 relative to the main axis 100. As an example, the undercut 32 can be formed on the guide sleeve 21 by cutting, for example by turning. The undercut 32 has an axial surface 33 extending in a radial plane of the main axis 100 and an inclined surface 34 arranged at an acute angle to the axial surface 33, which are connected to each other in the region of the undercut 32 by a radius (arc-shaped structure) 35.

[0053] like Figure 3 As shown, the undercut 32 is introduced into the axial end face 36 of the guide sleeve 21, wherein the axial face 33 delimits the recess 31 axially relative to the main axis 100, and the undercut 32 is formed by the inclined face 34. In other words, the inclined face 34 forms the undercut surface. For this purpose, the inclined face 34 can be inclined at an angle 104 of approximately 30° relative to the main axis 100. The inclined face 34 connects the axial face 33 and the end face 36, wherein a shearing edge 37 around the main axis 100 is formed between the inclined face 34 and the end face 36, by which the substrate is sheared off and the undercut 32 is filled during plastic deformation. Therefore, during the deformation process, the substrate flows into the undercut 32 along the inclined face 34. As an example, the recess 31 has an axial depth of approximately 0.2 mm and a radial depth of approximately 0.55 mm. The radius 35 is, for example, 0.05 mm.

[0054] like Figure 4As shown, the undercut 32 is introduced into the side surface 22 of the guide sleeve 21, wherein the inclined surface 34 delimits the recess 31 axially relative to the main axis 100, and the undercut 32 is formed by the axial surface 33. In other words, the axial surface 33 forms the undercut surface. The axial surface 33 connects the inclined surface 34 and the side surface 22, wherein a shearing edge 37 around the main axis 100 is formed between the axial surface 33 and the side surface 22, by which the base material is sheared off and the undercut 32 is filled during plastic deformation. During the deformation process, the base material thus flows into the undercut 32 along the axial surface 33. In this embodiment, the inclined surface 34 can be inclined at an angle 104 of about 30° relative to the main axis 100. As an example, the recess 31 has an axial width of about 0.7 mm and a radial depth of about 0.2 mm. The radius 35 is, for example, 0.2 mm. In addition, the recess 31 can be spaced apart from the end surface 36 by an axial distance of about 0.03 mm.

[0055] Figure 5 The schematic diagram shows the preassembly of the control assembly 8. For this purpose, the elastic unit 16, the control piston 10 and the control bowl 12 are preassembled coaxially with respect to the main axis 100 on the guide sleeve 21 and fixed in position relative to each other, for example, by means of a fixing device (not shown). In this case, the guide sleeve 21 rests axially with the first axial end 28 against the bowl bottom 12.

[0056] The deformation tool 38 is then placed on the side of the bowl bottom 12 facing away from the guide sleeve 21, wherein the guide sleeve 21 serves as a support for the deformation tool 38. The deformation tool 38 performs a defined displacement in the axial direction parallel to the main axis 100 and introduces a defined force F in the axial direction into the bowl bottom 12 in order to plastically deform it. Figure 1 In the deformation section 26 described, the deformation tool 38 has a recess 39 , wherein the inner diameter of the recess corresponds essentially to the outer diameter of the guide sleeve 21 at the first axial end 28 .

[0057] List of reference numerals:

[0058] 1 Damping valve device

[0059] 2 Piston rod

[0060] 3 Cylinder

[0061] 4 Damping piston

[0062] 5 Damping valve

[0063] 6 Flow channel

[0064] 7 Valve disc

[0065] 8 Control components

[0066] 9 Control bowl

[0067] 10 Control piston

[0068] 11 Bowl wall

[0069] 12 bowl bottom

[0070] 13 Sealing ring

[0071] 14 Control Chamber

[0072] 15 Another flow channel

[0073] 16 elastic units

[0074] 17 Elastic element

[0075] 18 Another elastic element

[0076] 19 Spacer elements

[0077] 20 Support elements

[0078] 21 Guide sleeve

[0079] 22 side surface

[0080] 23 End stop

[0081] 24 other end stopper

[0082] 25 stop plate

[0083] 26 deformation section

[0084] 27 grooves

[0085] 28 first end

[0086] 29 Second end

[0087] 30Form-fit connection

[0088] 31 recess

[0089] 32 Undercut

[0090] 33 Axial surface

[0091] 34 Inclined surface

[0092] 35 Radius

[0093] 36 end face

[0094] 37 Shear Edge

[0095] 38 Deformation Tools

[0096] 39 Notches

[0097] 40 form-fitting contours

[0098] 100 Main axis

[0099] 101 Stretching Exercise

[0100] 102 First end position

[0101] 103 Second end position

[0102] 104 Angle

[0103] F-force.

Claims

1. A control assembly (8) for a frequency-dependent damping valve arrangement (1) for a vibration absorber, the control assembly comprising: a control bowl (9) having a cylindrical bowl wall (11) and an annular bowl bottom (12) adjoining the bowl wall (11), a control piston (10) which is arranged in the control bowl (9) so as to be axially displaceable between a first end position (102) and a second end position (103) relative to a main axis (100) of the shock absorber and which delimits a control chamber (14) together with the control bowl (9), wherein: The bowl bottom (12) has a deformation section (26) produced by plastic deformation, which defines an axial end stop (23) for the control piston (10) in the first end position (102), a guide sleeve (21) which is guided through the control piston (10) coaxially with respect to the main axis (100), wherein the control piston (10) is slidingly guided on an outer side surface (22) of the guide sleeve (21), and wherein the deformation section (26) defines a groove (27) in which the guide sleeve (21) is partially accommodated with a first axial end (28), an elastic unit (16) which is axially supported on the control piston (10) relative to the main axis (100) and exerts an elastic force on the control piston (10), It is characterized in that The guide sleeve (21) has a recess (31) at the first axial end (28) arranged in the groove (27), into which the base material of the bowl bottom (12) is displaced by plastic deformation to form a positive connection (30).

2. The control assembly (8) according to claim 1, characterized in that The control bowl (9), the control piston (10), the elastic unit (16) and the guide sleeve (21) are held together in a pre-assembled state by means of the form-fitting connection (30) to form a common structural unit.

3. The control assembly (8) according to claim 1 or 2, characterized in that: The control bowl (9) is fixed to the guide sleeve (21) via the form-fit connection (30) in a play-free manner at least in the axial direction relative to the main axis (100).

4. A control assembly (8) according to any one of the preceding claims, characterized in that At least one of the recesses (31) is formed by an undercut (32) arranged in the groove (27).

5. The control assembly (8) according to claim 4, characterized in that The undercut portion (32) has an axial surface (33) extending in a radial plane of the main axis (100) and an inclined surface (34) arranged at an acute angle to the axial surface (33).

6. The control assembly (8) according to claim 5, characterized in that The axial surface (33) delimits the recess (31) axially relative to the main axis (100), wherein the undercut (32) is formed by the inclined surface (34).

7. The control assembly (8) according to claim 6, characterized in that The undercut (32) is introduced into an axial end face (36) of the guide sleeve (21), wherein a shearing edge (37) is formed between the inclined surface (34) and the end face (36).

8. The control assembly (8) according to claim 5, characterized in that The inclined surface (34) delimits the recess (31) axially relative to the main axis (100), wherein the undercut (32) is formed by the axial surface (33).

9. The control assembly (8) according to claim 8, characterized in that The undercut (32) is introduced into the side surface (22) of the guide sleeve (21), wherein a shearing edge (37) is formed between the axial surface (33) and the side surface (22).

10. The control assembly (8) according to any one of claims 5 to 9, characterized in that The axial surface (33) and the inclined surface (34) are connected to each other via a radius (35) in the recess (31).

11. A control assembly (8) according to any one of the preceding claims, characterised in that The at least one recess (31) is configured to be continuous in the circumferential direction.

12. A control assembly (8) according to any one of the preceding claims, characterised in that The at least one recess (31) is produced by cutting.

13. A control assembly (8) according to any one of the preceding claims, characterised in that The guide sleeve (21) has a radially outwardly directed positive-fit contour (40) at a second axial end (29), via which the elastic unit (16) is axially supported relative to the main axis (100).

14. Method for producing a control assembly (8) according to any one of the preceding claims, wherein: - pre-assembling the elastic unit (16), the control piston (10) and the control bowl (9) coaxially relative to one another on the guide sleeve (21); - The bowl bottom (12) of the control bowl (9) is plastically deformed in an axial direction relative to the main axis (100) by means of a deformation tool (38), wherein the base material of the bowl bottom (12) is displaced into the recess (31) under the action of force to form a positive connection (30).

15. The method according to claim 14, characterized in that In an intermediate step, the elastic unit (16) and the control piston (10) are pre-assembled on the guide sleeve (21), and the guide sleeve (21) is plastically deformed in an axial direction relative to the main axis (100) by means of another deformation tool, wherein the base material of the guide sleeve (21) is radially displaced outward to form a transport locking portion.

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