Vibration damper with stop cap

Abstract

A vibration damper 1 for a vehicle is proposed, comprising a container tube 2, a piston rod 3 which is guided section by section in the container tube 2 in the axial direction with respect to a longitudinal axis 100, a support bearing assembly 4 which has a base body 5 which has a vehicle connection section 6 for connecting the base body 5 to the vehicle and a piston rod connection section 8 for connecting the piston rod 3, a stop buffer 11 which is arranged around the piston rod 3, and a stop cap 12 which is arranged at the end of the container tube 2 and around the piston rod 3, wherein the stop cap 12 has a receiving section 13 for receiving the stop buffer 11 section by section, wherein the stop buffer 11 is fixed in the receiving section 13.

Description

The invention relates to a vibration damper for a vehicle having the features of the preamble of claim 1.For vibration damping, shock absorbers are usually used in chassis of vehicles which have a piston-cylinder structure. In this case, the piston-cylinder structure can be coupled on the one hand to a wheel carrier and on the other hand to a vehicle frame. In some driving situations, the shock absorber may be overloaded, so that it "breaks down". During "strike through", the piston retracts very far into the cylinder. In order to prevent damage to the spring damper upon "striking" of the cylinder at the fastening point of the spring damper, a stop body is usually arranged coaxially with the piston rod between the cylinder and the fastening point, which elastically springs off the stop. The stop body is fixedly arranged at the fastening interface in order to have a defined position when it stops.The publication DE 10 2004 013 084 A1 describes an arrangement comprising a piston rod bearing and a stop buffer for a vibration damper, comprising a bearing housing, a first supporting body supported on the bearing housing for supporting a piston rod in the direction of pull thereof, and a second supporting body for supporting the piston rod in the direction of pressure thereof, wherein the second supporting body is simultaneously designed as a stop buffer for the housing of the vibration damper. This stop buffer protrudes from the bearing housing in the direction of the vibration damper, wherein in the event of a strong compression a buffer cap comes into contact against the stop buffer.The object of the invention is to propose a vibration damper of the type mentioned at the beginning which is distinguished by a high level of operational reliability and an improved noise behavior.This object is achieved by a vibration damper having the features of claim 1. Preferred or advantageous embodiments of the invention are evident from the dependent claims, the following description and the appended figures.The invention relates to a vibration damper which is designed and / or suitable for a vehicle. The vibration damper can be designed as an unsprung shock absorber or as a spring shock absorber, in particular a spring strut. The vibration damper can be assigned to a wheel of a front axle and / or can be realized as a MacPherson strut. Alternatively, the vibration damper is assigned to a wheel of an intermediate axle or a rear axle of the vehicle. The vibration damper is designed, for example, as a gas pressure damper or as a hydraulic damper. The vehicle can be designed, for example, as a passenger car, truck, bus, two-wheeler, three-wheeler, motorcycle, etc.The vibration damper has a container tube. In particular, the container tube is designed as a cylinder tube, preferably with a circular opening cross section. For example, the container tube is closed on an axial end side by a piston rod guide.The vibration damper has a piston rod which is guided in sections in the container tube in the axial direction with respect to a longitudinal axis. In particular, the piston rod is guided linearly in the container tube via the piston rod guide, preferably sealingly. In particular, the vibration damper has a piston which is arranged in the inner damper tube so as to be axially displaceable via the piston rod and / or divides the inner damper tube into two working chambers. The piston is preferably mounted on the end side on the piston rod and / or is motion-coupled thereto. The piston preferably has at least one piston valve for generating a damping force during a pulling and / or pressing movement of the piston.Furthermore, the vibration damper has a support bearing assembly which has a base body. The support bearing assembly is in particular designed to couple the vibration damper to the vehicle, in particular to a vehicle body. Particularly preferably, the base body is formed in one piece, in one material and / or from a common, non-divided material section. In particular, the base body is formed from a metal, in particular from a metal alloy, in particular from an aluminum alloy.The base body has a vehicle connection section which is designed and / or suitable for connecting the base body to the vehicle. For this purpose, the vehicle connection section can have one or more connection interfaces, which are designed, for example, as through openings for the passage of screws, bolts or similar connection elements. In particular, the vehicle connection portion allows the fastening of the base body to the vehicle body.The base body has a piston rod connection section which is designed and / or suitable for connecting the piston rod. The piston rod can have a connection interface at a free end, e.g. a thread, an eyelet or the like, in order to couple the piston rod connection section to the piston rod-optionally using intermediate components. In particular, the coupling is designed such that a retraction of the piston rod from the base body is prevented, in particular in a positively locking manner.The vibration damper has a stop buffer which is arranged around the piston rod. The stop buffer is in particular designed as a deformable buffer, preferably a plastic or rubber buffer, which is elastically reversibly deformed in the event of a breakdown of the vibration damper. The deformability can be implemented by a material elasticity and / or by a shape elasticity. Preferably, the stop buffer is arranged coaxially to the piston rod and / or the piston rod is guided coaxially through the stop buffer.The vibration damper has a stop cap which is arranged at an end of the container tube opposite the support bearing assembly and is arranged around the piston rod. In particular, the stop cap serves to protect the upper end of the container tube and / or the piston rod guide. Preferably, the stop cap is arranged coaxially with the piston rod and / or the piston rod is guided coaxially through the stop cap. Preferably, the stop cap is secured in the axial direction with respect to the longitudinal axis in a form-fitting and / or force-fitting and / or material-fitting manner on the container tube and / or the piston rod guide.Within the scope of the invention, it is proposed that the stop cap has a receiving section which is designed and / or suitable for receiving the stop buffer in sections, wherein the stop buffer is fixed in the receiving section. In particular, the stop buffer is arranged, preferably inserted or inserted, at least in sections in the receiving section in an assembly direction. Preferably, the stop buffer is fixed in the receiving section in an axial and / or radial direction with respect to the longitudinal axis, preferably counter to the mounting direction, in a form-fitting and / or force-fitting manner. The mounting direction is in particular coaxial and / or unidirectional with respect to the main axis. Particularly preferably, the stop buffer has an insertion section, wherein the insertion section is inserted into the receiving section. The insertion section can be formed in a straight cylindrical manner. Preferably, at least or exactly two damping sections are adjacent to the insertion section, which damping sections are designed as circular rings. The diameter of the circular rings can decrease in the axial direction. Alternatively or additionally, the stop buffer is configured converging. In an unloaded state, the stop buffer is arranged spaced apart from the support bearing assembly in the axial direction with respect to the longitudinal axis. In a loaded state, in particular in the event of compression, the stop buffer can come to bear or strike against the support bearing assembly in the axial direction with respect to the longitudinal axis.The invention is based on the recognition that during the compression of the elastomeric stop buffer, it is typically moved under load relative to the piston rod, whereby an undesired noise is generated. By securing the stop buffer on the stop cap, the stop buffer is moved in the same way with the piston rod, whereby the friction between the stop buffer and the piston rod can be significantly reduced and thus the noise when the stop buffer is stopped is reduced. In addition, the invention is based on the finding that when the stop buffer is fixed on the support bearing assembly, the stop buffer is also pivoted when the piston rod is pivoted relative to the base body, wherein a gap is produced between the stop buffer and the base body by repeated pivoting and thus the stop buffer can migrate out of the base body. By securing the stop buffer on the stop cap, the stop buffer is prevented from falling out when the piston rod is pivoted, since the stop buffer is pivoted together with the piston rod and thus does not undergo any deformation due to the pivoting movement.In a concrete embodiment, it is provided that the receiving portion has an inner wall surface radially delimiting the receiving portion, wherein the stop buffer is fixed to the inner wall surface in a force-fit and / or form-fit manner counter to a mounting direction. In particular, an outer diameter of the stop buffer, preferably of the insertion section, is greater than the free inner diameter of the receiving section. For example, the stop buffer can be fixed in the receiving section via an interference fit, whereby the stop buffer is fixed in a force-fit manner on the inner wall surface. Alternatively or additionally, the stop buffer can be engaged behind at least in sections by the receiving section, whereby the stop buffer is fixed to the inner wall surface in particular counter to the mounting direction. For example, the inner wall surface is designed as a cylinder jacket surface encircling the longitudinal axis. The inner wall surface can be formed so as to taper in the axial direction with respect to the longitudinal axis, in particular counter to the mounting direction. A stop cap is thus proposed, which is distinguished by a particularly secure seat for the stop buffer.In a concrete embodiment, it is provided that the inner wall surface has at least or exactly one holding element which is designed and / or suitable for holding the buffer stop counter to the mounting direction of the buffer stop. In particular, the stop buffer is positively held against the mounting direction by the holding element. Preferably, the holding element is formed only in sections in the direction of rotation. In particular, the holding element has a rounded portion and / or a radius at least in the mounting direction. In other words, the holding element is configured to be edge-free in the mounting direction. Alternatively or optionally additionally, the holder element is configured in a edged manner in the circumferential direction. By means of the at least one holding element, the stop buffer can be held back securely in the receiving section during operation.In one possible embodiment, it is provided that the at least one holder element is formed by an elevation radially protruding from the inner lateral surface. In particular, the elevation extends radially inward, so that the elevation forms a constriction of the receiving section in the radial direction inward with respect to the main axis and / or reduces the receiving section. In other words, an outer diameter of the stop buffer, in particular of the insertion section, is greater than the free inner diameter in the region of the holding element. In particular, the stop buffer, which is preferably arranged clampingly in the receiving space, can be deformed by the elevations and thus forms a positive locking against the migration out. The holding element can be designed, for example, as a holding lug, a holding circle ring section or in another shape. By the configuration as a protrusion, a secure form fit is formed between the stop cap and the stop buffer.In an alternative embodiment, the at least one holder element or, in an optionally supplementary embodiment, at least one further holder element is formed by a depression introduced radially into the inner lateral surface. In particular, the depression extends radially outwards, so that the depression forms an extension of the receiving space outwards in the radial direction with respect to the main axis and / or increases the receiving section. In other words, an outer diameter of the stop buffer, in particular of the insertion section, is smaller than or equal to the free inner diameter in the region of the holding element. In particular, the stop buffer, which is preferably arranged clampingly in the receiving space, can expand into the retaining recess and thus forms a form-fit securing against the migration out. The holding element can be formed, for example, as an impression, undercut or in another shape. By the configuration as a depression, a secure form fit is formed between the stop cap and the stop buffer.In a further development, it is provided that the inner lateral surface has a plurality of the holder elements, which are distributed uniformly in the circumferential direction. In particular, the holder elements are uniformly spaced apart from one another in the circumferential direction. Preferably, the number of holding elements is even. Alternatively or optionally additionally, the holding elements are arranged opposite one another in pairs in the circumferential direction. In principle, the holding elements can be formed in a single row on the inner lateral surface. Alternatively, however, the holding elements can also be formed on the inner lateral surface in a multi-row, preferably double-row manner. The plurality of holding members ensures a particularly secure seat for the stop buffer in the receiving section. In addition, the holding elements are regularly arranged in the circumferential direction and / or opposite one another, so that tilting of the stop buffer is prevented.In a further concretization, it is provided that a first group of holding elements are designed as elevations and lie on a first pitch circle. Alternatively or optionally additionally, it is provided that a second group of holding elements is formed as depressions and lie on a second pitch circle. In particular, the first and / or second group of holding elements comprises at least two, preferably more than four, in particular more than eight holding elements. In particular, the pitch circles are arranged coaxially to the longitudinal axis and are spaced apart from one another in the axial direction. In simplified form, the holding elements are arranged in two rows. This ensures particularly secure fixing of the stop buffer in the receiving section.In a further specific implementation, it is provided that the first group is arranged in an opening region of the receiving section. Alternatively or optionally additionally, the second group is arranged in a base region of the receiving section. In other words, the receiving section is reduced in the opening region by the holding elements configured as an elevation and / or enlarged in the base region by the holding elements configured as a depression. In particular, the opening region is defined by a receiving opening which is open in the direction of the support bearing assembly. In particular, the base region is defined by a base surface delimiting the receiving section in the direction of the container tube. Particularly preferably, each holding element of the first group is assigned a holding element of the second group. In other words, the first and the second group have the same number of holding elements. Particularly preferably, the holding elements of the first and second group are arranged directly below one another. Alternatively, however, the holding elements of the first and second group can also be offset in the circumferential direction and / or arranged alternately. When it moves out, the stop buffer would first have to be brought out of the depressions back to the free diameter of the inner surface and at the same time would overturn the engagement of the elevations, this transition being prevented by the elastic properties of the stop buffer.In a further embodiment, it is provided that an outer wall surface of the receiving portion has a stiffening structure for stiffening the lateral surface. In particular, the stiffening structure serves to absorb a force which acts on the receiving portion, in particular in the radial direction, when the stop buffer is deformed. A stiffening structure can thus be understood to mean a partial region of the stop cap which does not deform or deforms only slightly under the action of the force acting on the receiving portion. The stiffening structure can be designed to conduct the force acting on the receiving section in a predefined direction. The stiffening structure can have, for example, an increased area moment of inertia compared to adjacent partial areas of the stop cap. Alternatively or additionally, the stiffening structure can have a geometric structure, for example a plurality of ribs or a layer structure, which is suitable for diverting the force acting on the receiving section. Particularly high stop forces can thus be absorbed by the stop cap without this being damaged in the process. Furthermore, the stop cap can be manufactured from any material, wherein a stiffening of the receiving section adapted to the stop forces is ensured by the stiffening structure.In a concrete structural implementation, it is provided that the stiffening structure is formed by a plurality of stiffening ribs extending in the axial direction with respect to the longitudinal axis and / or by at least or exactly one stiffening rib extending in the circumferential direction. In particular, the axial stiffening ribs are uniformly spaced apart from one another in the circumferential direction. In principle, the axial stiffening ribs extend at least over the entire axial height of the receiving portion. Preferably, however, the axial stiffening ribs extend beyond the height of the receiving portion into an adjacent partial region of the stop cap. Particularly preferably, each stiffening rib is assigned at least one holding element. Preferably, the at least one holding element is formed at the location of the stiffening rib on the inner wall surface. In particular, the at least one encircling stiffening rib is peripherally closed and / or formed between the axial stiffening ribs. In other words, the axial stiffening ribs are connected to one another by the encircling stiffening rib. Preferably, the circumferential stiffening rib is arranged within the axial height of the receiving section. Particularly preferably, the encircling stiffening rib is arranged in the base region and / or opposite the second group of retaining elements. Alternatively, however, the encircling stiffening rib can also be arranged in the opening region or opposite the first group of retaining elements and / or between the base region and the opening region or between the first and second group of retaining elements. A stiffening structure is thus proposed, which stiffens the receiving section both in the radial direction and in the axial direction and / or enables a uniform distribution of the acting forces.In a further embodiment, it is provided that the base body has a buffer stop surface which can come to rest with the stop buffer in the event of a compressive stress on the vibration damper. In other words, the buffer contact surface forms a stop in the axial direction with respect to the longitudinal axis for the elastomeric stop buffer. In particular, the buffer stop surface extends in a radial plane of the longitudinal axis. The buffer stop surface can be designed as a flat surface, preferably an annular surface, on which the stop buffer can come to rest with its axial end face.In a further refinement, it is provided that the base body has a lateral surface which extends around the buffer stop surface and which delimits a deformation space for the stop buffer in the radial direction. In particular, when the vibration damper springs in, the stop buffer dips partially into the deformation space at its end facing the support bearing assembly and is subsequently compressed. During the compression of the elastomeric stop buffer, the lateral surface defines a radial boundary of the deformation space, as a result of which a deformation of the elastomeric stop buffer via the buffer stop surface is limited. In particular, the stop buffer is caught by the lateral surface when the vibration damper springs in, so that even if the piston rod is inclined relative to the base body, the stop buffer is centered on the buffer stop surface. In particular, a free inner diameter of the lateral surface is larger than the outer diameter of the stop buffer, in particular of the last damper section, which outer diameter dips into the deformation space. Particularly preferably, the buffer stop surface is connected to the buffer stop surface via a rounded portion. A particularly gentle contact of the buffer stop in the axial and radial direction is thus created, whereby a long durability of the buffer stop is achieved.In a further development, it is provided that the stop cap is made of a plastic. When manufacturing the stop cap from plastic, particularly easy, cost-effective production and trouble-free assembly of the stop cap are made possible. Alternatively, the stop cap is made of a metal alloy, preferably an aluminum alloy, in particular an aluminum casting alloy. When manufacturing the stop cap from a metal alloy, a particularly stable and long-lived stop cap is made possible, which is suitable for absorbing particularly high stop forces. Particularly preferably, the stop cap is manufactured in one piece. In particular, the one-piece combination is characterized in that no transition can be detected which can be concluded, for example, from a joint. Instead, the material profile in the connection cap behaves in a materially uniform manner. The stop cap can be manufactured from plastic, for example from a plastic injection molding, and from an aluminum die casting in a manufacturing from a metal alloy.In a further specific implementation, the stop cap has a further receiving section for receiving the container tube in sections, wherein a partition wall is arranged between the receiving section and the further receiving section, which partition wall has a through-opening for the passage of the piston rod. In other words, the two receiving sections are connected to one another via the through-opening. In particular, the intermediate wall defines a bottom surface for the receiving section and a further bottom surface for the further receiving section. The bottom surfaces each extend in a radial plane to the longitudinal axis and are each formed as a circular ring surface through which the through-opening passes. In particular, the two receiving sections are arranged coaxially with respect to one another and are delimited from one another in the axial direction with respect to the longitudinal axis by the intermediate wall. In this case, the receiving section is opened in the direction of the support bearing assembly and the further receiving section is opened in the opposite direction and / or in the direction of the container tube. Particularly preferably, the two receiving sections are each designed as a pot section. In particular, the container tube is arranged, preferably inserted or inserted, counter to the mounting direction, at least in sections in the further receiving section. Preferably, the container tube is accommodated in the further accommodation section in an axial and / or radial direction with respect to the longitudinal axis in a form-fitting and / or force-fitting manner.In a development, the vibration damper has a fastening insert which is designed and / or suitable for fastening the piston rod in the piston rod connection section. The fastening insert is arranged coaxially to the piston rod in the piston rod connection section. In particular, the fastening insert is mounted and / or fixed coaxially on the piston rod, preferably on the connection interface. In particular, the fastening insert is designed as a plastic body, wherein the piston rod, in particular with the connection interface, is arranged in the fastening insert in a non-displaceable manner. By means of the fastening insert, the piston rod is fixed in the direction of the vibration damper and at the same time supported in a floating and / or movable manner in the piston rod connection section.Further features, advantages and effects of the invention are evident from the following description of preferred exemplary embodiments of the invention and from the attached figures. These show: FIG. 1 is a schematic sectional view of a vibration damper as an embodiment of the invention; FIG. 2 shows a sectional illustration of a stop cap of the vibration damper from FIG. 1 ; FIG. 3 shows a perspective illustration of the stop cap from FIG. 2.FIG. 1 shows a schematic sectional illustration of a vibration damper 1 for a vehicle as an exemplary embodiment of the invention. The vibration damper 1 has a cylinder housing 2, in which a piston rod 3 with a piston, not shown, is arranged displaceably along a longitudinal axis 100 in order to form a damper element in the vibration damper 1.The vibration damper 1 has a support bearing assembly 4, wherein the support bearing assembly 4 connects the vibration damper 1 to the vehicle, in particular a vehicle body. The support bearing assembly 4 has a base body 5, wherein the base body 5, viewed functionally, forms a coupling with the piston rod 3 and the connection to the vehicle.For this purpose, the base body 5 has a vehicle connection section 6, by means of which the base body 5 can be fixed to the vehicle, in particular to the vehicle body. The vehicle connection section 6 has two connection interfaces 7 a, 7 bwhich are designed as through-openings, wherein, for example, screws or bolts for fastening the base body 5 to the vehicle can be passed through the through-openings. The vehicle connection section 6 can be designed as a flange which is angled in a manner appropriate for installation, for example at a 45° or 30° angle.Furthermore, the base body 5 has a piston rod connection section 8, which is designed for coupling to the piston rod 3. For this purpose, the vibration damper 1 has a fastening insert 9, wherein the piston rod 3 is connected to the fastening insert 9 in a non-displaceable manner. The fastening insert 9 is fixed in the piston rod connection section 8, wherein the piston rod 3 is guided via a central through-opening 10 into the piston rod connection section 8 and connected to the fastening insert 9. For example, the piston rod 3 is coupled to the base body 5 in a pivotable and / or floating manner via the fastening insert 9.The vibration damper 1 has a stop buffer 11 arranged between the base body 5 and the container tube 2, which is arranged coaxially and / or centrally with respect to the piston rod 3. The stop buffer 11 has the task of providing additional damping in the event of excessive displacement of the container tube 2 relative to the support bearing assembly 4. The stop buffer 11 is designed as an elastic body, which is realized to be material-elastic and shape-elastic.Furthermore, the vibration damper 1 has a stop cap 12 arranged on the container tube 2, which is arranged coaxially and / or centrally with respect to the piston rod 3. The stop buffer 11 is fixedly accommodated in sections in the stop cap 12 and / or connected to it in an assembly direction 101 aligned axially to the longitudinal axis 100. For this purpose, the stop cap 12 has a receiving section 13 and a further receiving section 14, which are each designed as a pot section and are open outwards on sides facing away from one another in the axial direction with respect to the main axis 100. The receiving section 13 is designed to receive the stop buffer 7 and can receive the stop buffer 7 in this function. The further receiving section 14 is designed to receive the container tube 2 and can receive the container tube 2 in this function.The stop buffer 11 has a straight cylindrical insertion section 15 which is inserted at least in sections into the receiving section 13 in the mounting direction 101. Adjoining the plug-in portion 15 are two damper portions 16 a, 16 bwhich are formed as circular rings, wherein the diameter of the circular rings decreases in the direction of the support bearing assembly 4 and / or the stop buffer 11 is formed converging.The two receiving sections 13, 14 are arranged coaxially with respect to one another and are delimited from one another in the axial direction with respect to the main axis 100 by an intermediate wall 17. The intermediate wall 17 has a central through-opening 18 for the passage of the piston rod 3, via which the two receiving sections 13, 14 are connected to one another. The two receiving sections 13, 14 and the intermediate wall 17 are manufactured in the form of the stop cap 11 from a common material section, for example a plastic injection molded part or an aluminum die cast part. The base body 6 is thus formed integrally with these three sections 13, 14, 17 and / or in one material and / or from a common, non-divided material section.In the depicted normal state of vibration damper 1, stop buffer 11 is spaced apart from base body 5. The base body 5 has a buffer stop surface 26 facing the stop buffer 11, which is axially spaced apart from the stop buffer 11 in the normal state. The buffer stop surface 26 extends in a radial plane of the longitudinal axis 100 and is designed as a circular ring surface encircling the longitudinal axis 100, which is traversed by the through-opening 10. The buffer stop surface 26 forms an axial stop for the stop buffer 11, which cooperates with the stop buffer 11 from a specific retraction path of the piston rod 3.Furthermore, the base body 5 has a lateral surface 27 which extends around the buffer stop surface 26 and which delimits a deformation space 28 for the stop buffer 11 in the radial direction. The lateral surface 27 is connected to the buffer stop surface 26 via a rounded portion 29 and serves for the radial contact of the stop buffer 11. By means of the buffer stop surface 26 and the lateral surface 27, a particularly gentle contact of the stop buffer 11 in the axial and radial direction is achieved.By securing the stop buffer 11 on the stop cap 12, the noise behavior is improved on the one hand and the seat of the stop buffer 11 is improved on the other hand in the event of a load, in particular a compression of the vibration damper 1, since the stop buffer 11 is moved together with the container tube 2 or the piston rod 3.FIG. 2 shows the stop cap 12 in a sectional view, wherein it can be seen that the intermediate wall 17 defines a bottom surface 19 for the receiving portion 13 and a further bottom surface 20 for the further receiving portion 14. The bottom surfaces 19, 20 each extend in a radial plane to the main axis 100 and are each formed as a circular ring surface through which the through-opening 21 passes.The receiving section 13 is bounded in the radial direction with respect to the main axis 100 by a circumferential inner wall surface 21, and the further receiving section 14 is bounded in the radial direction with respect to the main axis 100 by a further circumferential inner wall surface 22. The inner wall surface 21 merges into the bottom surface 19, wherein the inner wall surface 21 and the bottom surface 19 together delimit or form the receiving portion 13. The further inner wall surface 22 merges into the further bottom surface 20, wherein the further inner wall surface 22 and the further bottom surface 20 together delimit or form the further receiving portion 14. The coarse shape of the receiving section 13 and of the further receiving section 14 is in each case cylindrical. For example, the receiving section 13 is designed to taper conically with a circular base surface. In other words, the inner wall surface 21 is formed as a truncated cone lateral surface. For example, the further receiving section 14 is formed in a straight cylindrical manner with a circular base surface. In other words, the further inner wall surface 22 is designed as a cylinder jacket surface.For mounting the stop flap 12, it can be placed onto the container tube 2 in the axial direction with respect to the main axis 100, wherein the container tube 2 is received in the further receiving section 14 at the end in an axial and radial direction with respect to the main axis 100 in a force-fit and / or form-fit manner. For mounting the stop buffer 11, the latter is inserted into the receiving section 13 in the mounting direction 101, wherein the inner wall surface 21 holds the stop buffer 7 captive, in particular in a force-fit and / or form-fit manner, counter to the mounting direction 101.For this purpose, a plurality of holding elements 23 are formed on the inner wall surface 21, which elements are operatively connected to the insertion section 15. Here, a first group of holding elements 23 is designed as elevations 24, which project radially inward from the inner wall surface 21. The elevations 24 form undercut contours with respect to the mounting direction 101 in order to prevent the stop buffer 11 from migrating outward in a positive-locking manner against the mounting direction 101. Optionally, the connection buffer 11 can have a corresponding, encircling contour, in particular an encircling groove, in which the elevations 24 engage. The elevations 24 are designed as integrally formed holding protrusions which are arranged spaced uniformly from one another in the circumferential direction, preferably lying on a common pitch circle. The elevations 24 extend inward in the radial direction for example over approximately 5% to 10% of the inner radius of the inner wall surface 21.Furthermore, a second group of holding elements 23 is formed as depressions 25, which are introduced into the inner wall surface 21 outwards in the radial direction. The depressions 25 likewise form undercut contours with respect to the mounting direction 101 in order to prevent the stop buffer 11 from migrating outward in a positive-locking manner against the mounting direction 101. The stop buffer 11 can elastically expand at least in sections into the depressions 25, so that the stop buffer 11 is held in a form-fitting manner counter to the mounting direction 101. The depressions 24 are formed as integrally formed retaining windows which are arranged spaced uniformly from one another in the circumferential direction, preferably lying on a further common pitch circle. The depressions 25 extend outwards in the radial direction for example over approximately 5% to 10% of the inner radius of the inner wall surface 21.The holding elements 23 formed as elevations 24 are arranged in an opening region of the receiving section 13 and the holding elements 23 formed as depressions 25 are arranged in a base region of the receiving section 13. In other words, the elevations 24 and the depressions 25 are arranged offset with respect to one another in the axial direction with respect to the longitudinal axis 100, in particular in the mounting direction 101. In this case, each elevation 24 is assigned a respective depression 25, wherein the elevations 24 and the depressions 25 are each arranged directly below one another in pairs. This ensures a particularly secure seat for the stop buffer 11.FIG. 3 shows the stop cap 12 in a perspective illustration, wherein it can be seen that an outer wall surface 30 of the receiving portion 13 has a stiffening structure 31 for stiffening the receiving portion 13. The stiffening structure 31 has the function here of absorbing and / or dissipating a deformation force acting on the receiving section 13 during a deformation of the stop buffer 11. For this purpose, the stiffening structure 31 has a plurality of stiffening ribs 32 running axially with respect to the longitudinal axis 100, and a stiffening rib 33 which runs around the longitudinal axis 100 and connects the axial stiffening ribs 32 to one another in a running manner.The axial stiffening ribs 32 extend here, as also shown in FIG. 2, in the axial direction beyond the axial height 102 of the receiving portion 13 in sections into the further receiving portion 13. In addition, the encircling stiffening rib 33 extends in the region of the maximum encirclingly between axial stiffening ribs 32. the axial stiffening ribs 32 are arranged opposite the retaining contours 23, wherein each axial stiffening rib 32 is assigned a respective elevation 24 and a respective depression 25. In other words, the receiving section 13 is reinforced in the region of the holding contours 23 by the axial stiffening ribs 32.A particularly stable configuration of the receiving section 13 is realized by the stiffening structure 31, as a result of which the service life of the stop cap 12, in particular in the case of a configuration made of plastic, can be significantly increased.Reference numerals denote reference numerals1 Vibration damper 2 Cylinder housing 3 Piston rod 4 Support bearing assembly 5 Base body 6 Vehicle connection portion 7 a, b Connection interfaces 8 Piston rod connection portion 9 Fastening insert 10 Through opening 11 Stop buffer 12 Stop cap 13 Receiving portion 14 Further receiving portion 15 Plug-in portion 16 a, b Damper portions 17 Intermediate wall 18 Through opening 19 Base surface 20 Further base surface 21 Inner wall surface 22 Further inner wall surface 23 Holding members 24 Elevations 25 Depressions 26 Buffer stop surface 27 Lateral surface 28 Deformation space 29 Rounded portion 30 Outer wall surface 31 Stiffening structure 32 Axial stiffening ribs 33 Circumferential stiffening ribs 100 Longitudinal axis 101 Mounting direction 102 Axial heightReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2004 013 084 A1

[0003]

Claims

Vibration damper (1) for a vehicle, - with a container tube (2), - with a piston rod (3) which is guided in sections in the container tube (2) in the axial direction with respect to a longitudinal axis (100), - with a support bearing assembly (4) which has a base body (5) which has a vehicle connection section (6) for connecting the base body (5) to the vehicle and a piston rod connection section (8) for connecting the piston rod (3), - with a stop buffer (11) which is arranged around the piston rod (3), - with a stop cap (12) which is arranged at the end of the container tube (2) and is arranged around the piston rod (3), characterized in that the stop cap (12) has a receiving section (13) for receiving the stop buffer (11) in sections, wherein the stop buffer (11) is fixed in the receiving section (13).Vibration damper (1) according to Claim 1, characterized in that the receiving section (13) has an inner wall surface (21) which radially delimits the receiving section (13), wherein the stop buffer (11) is fixed to the inner wall surface (21) in a force-fitting and / or form-fitting manner counter to a mounting direction (101).Vibration damper (1) according to Claim 2, characterized in that the inner wall surface (21) has at least one retaining element (23) for retaining the stop buffer (11) counter to the mounting direction (101).Vibration damper (1) according to Claim 3, characterized in that the at least one holder element (23) is formed by an elevation (24) which projects radially from the inner wall surface (21).Vibration damper (1) according to Claim 3 or 4, characterized in that the at least one retaining element (23) or at least one further retaining element (23) is formed by a depression (25) which is introduced radially into the inner wall surface (21).Vibration damper (1) according to one of Claims 3 to 5, characterized in that the inner wall surface (21) has a plurality of the holder members (23) which are uniformly distributed in the circumferential direction about the longitudinal axis (100).Vibration damper (1) according to Claim 6, characterized in that a first group of retaining members (23) is designed as elevations (24) and lies on a first pitch circle, and / or in that a second group of retaining members (23) is designed as depressions (25) and lies on a second pitch circle.Vibration damper (1) according to Claim 7, characterized in that the first group of retaining members (23) is arranged in an opening region of the receiving section (13), and / or in that the second group of retaining members (23) is arranged in a base region of the receiving section (13).Vibration damper (1) according to one of Claims 2 to 8, characterized in that an outer wall surface (30) of the receiving portion (13) has a stiffening structure (31) for stiffening the receiving portion (13).Vibration damper (1) according to Claim 9, characterized in that the reinforcing structure (31) is formed by a plurality of reinforcing ribs (32) which extend in the axial direction with respect to the longitudinal axis (100) and / or by at least one reinforcing rib (33) which extends in the circumferential direction.Vibration damper (1) according to one of the preceding claims, characterized in that the base body (5) has a buffer stop surface (26), which can come to bear against the stop buffer (11) when the vibration damper (3) is stressed.Vibration damper (1) according to Claim 11, characterized in that the basic body (5) has a lateral surface (27) which extends around the buffer stop surface (26) and which delimits a deformation space (28) for the stop buffer (11) in the radial direction.Vibration damper (1) according to one of the preceding claims, characterized in that the stop cap (12) is produced from a plastic or a metal alloy.Vibration damper (1) according to one of the preceding claims, characterized in that the stop cap (12) has a further receiving section (14) for receiving the container tube (2) in sections, wherein an intermediate wall (17) is arranged between the receiving section (13) and the further receiving section (14), said intermediate wall having a through-opening (18) for the passage of the piston rod (3).Vibration damper (1) according to one of the preceding claims, characterized bya fastening insert (9) for fastening the piston rod (3) in the piston rod connection section (8), wherein the fastening insert (9) is arranged coaxially with respect to the piston rod (3) in the piston rod connection section (8).

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