Wheel suspension for a motor vehicle

Abstract

The invention relates to a wheel suspension (1) for a motor vehicle, comprising: a spring link (2) which is designed as a leaf spring element (3); at least one fastening device (4) which has two fastening elements (6, 7) which each have a respective abutment surface (8, 9) between which the spring link (2) is arranged and connected in a force-fitting manner to the fastening device (4); at least one holding device (14) which has two holding parts (16, 17) which each have a respective support surface (18, 19) between which the spring link (2) is arranged and connected in a force-fitting manner to the holding device (14) via the support surfaces (18, 19), wherein the first fastening element (6) has a receiving opening (26) and the second fastening element (7) has a connection part (27) which is arranged in the receiving opening (26) to form a form-fitting connection (27a), and / or the holding parts (16, 17) are designed separately from one another and at least the support surface (18, 19) of one of the holding parts (16, 17) is connected in a form-fitting manner to the spring link (2).

Description

[0001] Wheel suspension for a motor vehicle

[0002] The invention relates to a wheel suspension for a motor vehicle according to the preamble of patent claim 1.

[0003] DE 102020 128606 A1 discloses a device for mounting a transverse leaf spring of a vehicle on a vehicle body. The device has a lower clamping shell, which, when installed in the vehicle, is arranged on a lower side of the transverse leaf spring as viewed in the vehicle's vertical direction, and an upper clamping shell, which, when installed in the vehicle, is arranged on an upper side of the transverse leaf spring as viewed in the vehicle's vertical direction. The lower and upper clamping shells each comprise a support surface, each of which is designed such that the transverse leaf spring can be at least partially clamped between the two support surfaces in the installed state. Furthermore, the lower and upper clamping shells each comprise two connecting regions at which the two clamping shells are non-positively connected to one another.

[0004] The object of the invention is to provide a wheel suspension for a motor vehicle so that the mechanical load capacity of the wheel suspension can be particularly increased.

[0005] This object is achieved according to the invention by a wheel suspension for a motor vehicle having the features of patent claim 1. Advantageous embodiments of the invention are the subject of the dependent patent claims and the description.

[0006] The invention relates to a wheel suspension for a motor vehicle, which is designed, for example, as a passenger car or a commercial vehicle. The motor vehicle, particularly in its fully manufactured state, preferably has the wheel suspension.

[0007] The wheel suspension has at least one spring link, which is provided or configured to guide at least one vehicle wheel of the motor vehicle and is designed as a leaf spring element. In other words, the at least one vehicle wheel can be guided by means of the spring link. The spring link can therefore be understood, in particular, as a wheel check. The leaf spring element can be understood, in particular, as a leaf spring. The leaf spring element is preferably designed to be elastic. Because the spring link is designed as a leaf spring element, the spring link can be understood, in particular, as a wheel-guiding leaf spring.

[0008] A main direction of extension of the spring link extends, particularly in the installed position of the wheel suspension in the motor vehicle, preferably at least substantially in the transverse direction of the motor vehicle. Therefore, the leaf spring can be understood in particular as a transverse leaf spring. The spring link or leaf spring is preferably formed, in particular at least partially, predominantly, or completely, from a fiber composite material. Therefore, the spring link can be referred to in particular as a fiber composite leaf spring, in particular as a fiber composite transverse leaf spring.

[0009] The term "vehicle wheel" refers, in particular, to a ground contact element of the motor vehicle. Preferably, the motor vehicle, in particular a body of the motor vehicle, can be or is supported on a surface, in particular a roadway, via the vehicle wheel. In particular, the vehicle wheel rolls on the surface or roadway while the motor vehicle is traveling.

[0010] The wheel suspension has at least one fastening device which is formed separately from the spring link and which has at least two fastening elements which are formed separately from one another and in particular are connected to one another. In other words, the fastening device is formed in several parts, in particular in two parts. The fastening device thus has at least one first fastening element and at least one second fastening element, which is formed in particular separately from the first fastening element. The fastening elements each have a respective contact surface. This means that the first fastening element has at least one first contact surface and that the second fastening element has at least one second contact surface, which is in particular different from the first contact surface and preferably spaced apart from the first contact surface.The spring link is arranged, in particular at least indirectly or directly, between the contact surfaces. In other words, the first fastening element, in particular the first contact surface, is arranged on a first side of the spring link, and the second fastening element, in particular the second contact surface, is arranged on a second side of the spring link that is different from the first side, in particular opposite the first side.

[0011] For example, the first side, in particular in the installed position of the wheel suspension in the motor vehicle, is an upper side of the spring link pointing upwards in the vertical direction of the vehicle. For example, the second side, in particular in the installed position of the wheel suspension in the motor vehicle, is a downward-facing underside of the wheel check arm. Thus, the first fastening element, in particular the first contact surface, is arranged, for example, at least in regions, in particular predominantly or entirely, above the spring link in the vertical direction of the vehicle, and the second fastening element, in particular the second contact surface, is arranged, for example, at least in regions, in particular predominantly or entirely, below the spring link in the vertical direction of the vehicle.Alternatively, it is of course possible for the first side to be designed as the underside of the spring link, which points downwards, in particular when the wheel suspension is installed in the motor vehicle, and for the second side to be designed as the upper side of the spring link, which points upwards, in particular when the wheel suspension is installed in the motor vehicle. Thus, the first fastening element, in particular the first contact surface, can be arranged at least partially, in particular predominantly or completely, below the spring link in the vehicle's vertical direction, and the second fastening device, in particular the second contact surface, can be arranged at least partially, in particular predominantly or completely, above the spring link in the vehicle's vertical direction. Preferably, the spring link is supported, for example at least indirectly or directly, on the fastening elements, in particular on the contact surfaces, in particular in the vehicle's vertical direction of the motor vehicle.

[0012] The spring link is connected at least non-positively to the fastening device, in particular to the fastening elements, for example at least indirectly or directly, via the contact surfaces. This means that the spring link is non-positively connected, in particular at least indirectly or directly, to the first fastening element via the first contact surface and non-positively connected, in particular at least indirectly or directly, to the second fastening element via the second contact surface. In other words, the spring link, in particular at least one connecting region of the spring link, is clamped or clamped between the fastening elements, in particular between the contact surfaces. Therefore, the fastening elements can be understood to mean, in particular, clamping elements. The non-positive connection can be understood to mean, in particular, a frictional connection.The fact that the spring link is connected to the fastening device in a force-locking manner via the contact surfaces can be understood in particular to mean that the connection of the spring link by means of the fastening device, in particular via the contact surfaces, is at least partially effected by a force-locking connection.

[0013] The fastening device, in particular the first and / or second fastening element, is formed, for example, from a metal, in particular a respective metal. Thus, the fastening elements are, for example, metallic clamping parts.

[0014] The fastening device, in particular the first fastening element and / or the second fastening element, has at least one first bearing point, via which the spring link, in particular via the fastening device, is or can be coupled in an articulated manner to the body of the motor vehicle, in particular at least indirectly or directly. In other words, the spring link is or can be connected in an articulated manner to the body of the motor vehicle via the first bearing point, in particular at least indirectly or directly. This means that the fastening device, and in particular the spring link, is or can be attached to the body of the motor vehicle via the first bearing point, in particular at least indirectly or directly.The articulated coupling of the spring link to the body can be understood in particular to mean that the spring link coupled to the body via the first bearing point, or the fastening device coupled to the body via the bearing point, is pivotable relative to the body about at least one pivot axis. The first bearing point is designed, for example, as a rubber bearing, or a rubber bearing is arranged at the first bearing point.

[0015] The body can be understood, for example, as a shell of the motor vehicle. The body is preferably designed as a, in particular self-supporting, body of the motor vehicle. The body, for example, delimits an interior of the motor vehicle at least partially, in particular completely. The interior can in particular be referred to as the vehicle interior or as the passenger cell. In particular when the body is designed as a, in particular self-supporting, body, a chassis of the motor vehicle is, for example, part of the body. For example, the chassis is part of a floor assembly or a floor element of the body. The chassis is, for example, designed as a support, in particular as an axle support. The support is, for example, frame-shaped. This means that the support is, for example, designed as a frame.Thus, coupling the spring link via the first bearing point to the body can be understood in particular as coupling the spring link via the first bearing point to the chassis and / or the body of the motor vehicle.

[0016] The wheel suspension has at least one holding device which is formed separately from the spring link and the fastening device and in particular is spaced apart from the fastening device and which has at least two holding parts. In other words, the holding device has at least one first holding part and at least one second holding part, which in particular is different from the first holding part. The holding parts each have a respective support surface. This means that the first holding part has at least one first support surface and that the second holding part has at least one second support surface, which in particular is different from the first support surface. The spring link is arranged, in particular at least indirectly or directly, between the support surfaces.In other words, the first holding part, in particular the first support surface, is arranged on the first side of the spring link, and the second holding part, in particular the second support surface, is arranged on the second side of the spring link. Thus, the first holding part, in particular the first support surface, is arranged, for example, at least in part, in particular predominantly or entirely, above the spring link in the vertical direction of the vehicle, and the second holding part, in particular the second support surface, is arranged, for example, at least in part, in particular predominantly or entirely, below the spring link in the vertical direction of the vehicle.Alternatively, the first holding part, in particular the first support surface, is arranged, for example, in the vertical direction of the vehicle, at least in part, in particular predominantly or entirely, below the spring link, and the second holding part, in particular the second support surface, is arranged, for example, in the vertical direction of the vehicle, at least in part, in particular predominantly or entirely, above the spring link. Preferably, the spring link is supported on the holding parts in the vertical direction of the vehicle, in particular via the support surfaces.

[0017] The spring link is connected via the support surfaces, in particular at least indirectly or directly, in a force-fitting manner to the holding device, in particular to the holding parts. In other words, the spring link, in particular a fastening region of the spring link that is different from the connection region, is clamped or clamped between the holding parts, and in particular between the support surfaces. Therefore, the respective holding part can be understood in particular as a respective clamping part. For example, the holding device, in particular the first holding part and / or the second holding part, is formed at least partially, in particular predominantly or entirely, from one, in particular respective, metal.

[0018] The holding device, in particular the first and / or the second holding part, has at least one second bearing point, via which the spring link, in particular via the holding device, is or can be coupled in an articulated manner to the vehicle wheel, in particular to a wheel carrier for the vehicle wheel, for example at least indirectly or directly. In other words, the spring link is or can be connected in an articulated manner to the vehicle wheel or the wheel carrier via the second bearing point, in particular at least indirectly or directly. This means that the wheel carrier, and in particular the vehicle wheel, is or can be fastened to the fastening device, and in particular to the spring link, via the second bearing point, in particular at least indirectly or directly.The articulated coupling of the spring link to the vehicle wheel can be understood in particular to mean that the vehicle wheel coupled to the spring link via the second bearing point, in particular via the fastening device, can be pivoted about at least one pivot axis relative to the spring link, and in particular relative to the fastening device. This means that an articulated connection to the wheel carrier, and in particular to the vehicle wheel, can be provided via the second bearing point. The second bearing point is designed, for example, as a rubber bearing, or a rubber bearing is arranged at the second bearing point.

[0019] In order to be able to particularly increase the mechanical load-bearing capacity of the wheel suspension, the invention provides that the first fastening element has at least one receiving opening and the second fastening element has at least one connecting part which is different from a screw element and which is arranged in the receiving opening, in particular at least in regions, predominantly or completely, to form or bring about a positive connection between the fastening elements. In other words, the connecting part is arranged at least in regions in the receiving opening in order to form or bring about the positive connection between the fastening elements. In other words again, the fastening elements are connected to one another in a positive-fitting manner, in particular directly, via the connecting part arranged or received in the receiving opening, in particular bypassing the spring link.Thus, the receiving opening is designed for arranging or receiving the connecting part. Preferably, the receiving opening and the connecting part are designed to correspond to one another. The connecting part is preferably spaced from the contact surfaces. The fact that the connecting part is different from a screw element can be understood in particular to mean that the connecting part is not designed as a screw element. In particular, the connecting part is free of a thread, i.e., the connecting part does not have a thread. In particular, the receiving opening is free of a thread, i.e., the receiving opening does not have a thread. In other words, the positive connection is not a screw connection.

[0020] In order to be able to particularly increase the mechanical load-bearing capacity of the wheel suspension, it is alternatively or additionally provided according to the invention that the holding parts are designed separately from one another. This means that the holding device is designed in several parts, in particular in two parts. At least the support surface of one of the holding parts is positively connected to the spring link, in particular at least indirectly or directly. This means that the first support surface of the first holding part and / or the second support surface of the second holding part is positively connected to the spring link, in particular at least indirectly or directly. In other words, at least the support surface of one of the holding parts forms a, in particular direct, positive connection with the spring link.In other words, at least the support surface of one of the holding parts is designed, at least in part, as a coupling region, in particular one different from a screw element, via which the holding part having the coupling region is connected, in particular directly, in a form-fitting manner to the spring link. The coupling region can be understood, in particular, as a coupling surface which is preferably designed to correspond to the fastening region of the spring link. Preferably, the form-fitting connection between the spring link and the at least one of the holding parts via its support surface is not a screw connection. This means that this form-fitting connection is not designed as a screw connection.

[0021] In order to be able to particularly increase the mechanical load-bearing capacity of the wheel suspension, it is alternatively or additionally provided according to the invention that at least one of the respective fastening elements, in particular the respective first and / or the respective second fastening element, has at least one respective receiving region in which a respective receiving element of the leaf spring element is received or arranged, whereby the leaf spring element and the respective fastening element, in particular the respective first and / or the respective second fastening element, are connected to one another in a form-fitting manner, for example at least indirectly or directly. In other words, the respective receiving element of the leaf spring element is arranged or received in the respective receiving region to form a form-fitting connection or to form a form-fitting connection.This means that the leaf spring element, in particular via at least one of the respective contact surfaces, preferably via the respective first and / or the respective second contact surface, forms an at least indirect, in particular direct, positive connection with at least one of the fastening elements, in particular with the respective first and / or with the respective second fastening element. This positive connection is preferably not a screw connection. This means that the respective receiving element and / or the respective receiving area is not a screw element. Thus, the respective receiving element and / or the respective receiving area is free of a thread.

[0022] The respective receiving area can be understood, for example, as an opening, in particular a recess. The respective receiving element is designed, for example, as a raised portion. Preferably, the respective receiving element and the respective receiving area are designed to correspond to one another.

[0023] The invention is based in particular on the following findings and considerations: In principle, it is conceivable for the holding device to be designed as a single piece, which accommodates the spring link, and in particular at least one rubber bearing. In this case, it is conceivable in principle not to provide a positive connection between the holding device and the spring link, although such a positive connection would not be readily achievable due to the single-piece design of the holding device. Furthermore, it is conceivable in principle for the fastening elements of the fastening parts to be designed as a shell construction. Force introduction parts in the form of the single-piece holding device and / or the shell-shaped fastening elements can represent an efficient solution, for example, for manageable operating loads, such as those that can occur in compact class vehicles.However, there may be limits to the forces that can be transmitted or to be transmitted, particularly due to the elasticity of the shell construction. In particularly heavy vehicles, such as SUVs, very considerable, i.e. particularly large, forces can occur, particularly in the event of special events such as potholes or in the event of misuse. Installation of the one-piece fastening device is usually not practical, for example due to a three-dimensional arrangement of several rubber bearings in space, which can be installed in two different views. Likewise, a conflict of objectives can arise between sufficient play between the one-piece clamping parts and the spring link for effortless joining of the components before screwing and deformation of the holding parts when the screws are tightened. This deformation can generate particularly high stresses in the notch root and therefore cannot allow for a large joining play.

[0024] In contrast, the wheel suspension according to the invention can significantly increase the mechanical load-bearing capacity of the wheel suspension. This means that the stability of the wheel suspension can be significantly increased. This can be achieved, in particular, by the positive locking of the fastening elements and / or by the positive locking of at least one of the retaining parts with the spring link and / or by the positive locking of the respective fastening element with the spring link. Thus, in addition to the frictional locking of the fastening elements via the contact surfaces with the spring link, the fastening device can also provide a positive locking or positive connection of the fastening elements to one another.Alternatively or additionally, in addition to the frictional connection or the force-locking connection of the spring link with the holding device, the form-locking connection or the form-locking connection of at least one of the holding parts to the spring link via the support surface can be provided. Alternatively or additionally, in addition to the frictional connection of the fastening elements via the contact surfaces with the spring link, the form-locking of the respective fastening element with the leaf spring element can be provided via the respective receiving element and the respective

[0025] Receiving area may be provided. In particular, the respective positive locking can provide respective overload protection for the wheel suspension. Thus, for example, particularly high forces, in particular by means of a particularly suitable force introduction, can be transmitted particularly safely from the vehicle wheel via the spring link to the body or the body. This can be ensured by the wheel suspension according to the invention. In particular, the wheel suspension according to the invention can significantly increase safety against damage to or destruction of the wheel suspension.

[0026] Because the fastening device is designed in several parts or two parts, the stability and mechanical load-bearing capacity of the holding device, in particular of the holding parts, can be particularly increased since, for example, bending of the holding device, in particular of the holding parts, when pre-tensioning the screws can be kept to a minimum or can be avoided. In particular, the conflict of objectives between sufficient play between the clamping part and the spring link, in particular for effortless joining, and deformation of the holding parts when the screws are tightened can be avoided. When assembling the holding device, the first holding part can be mounted on the spring link, for example, from above and the second holding part, for example, from below.In particular, during assembly, the retaining parts can be positioned on one end face of the spring link, and then screws can be installed and tightened to clamp the spring element to the retaining parts. This allows assembly effort to be kept to a minimum. This means that the manufacturing effort for the wheel suspension, especially for the vehicle, can be kept to a minimum.

[0027] Preferably, the fastening elements are not designed as a shell construction, but rather, for example, in the form of two solid, in particular upper and lower, fastening elements or clamping parts. Thus, the respective fastening element is preferably designed as a solid part. For example, the respective fastening element is produced by casting or forging. This means that the respective fastening element can be manufactured or formed as a cast part or as a forged part, in particular from steel or aluminum. This makes it possible to achieve a sufficiently high or particularly high surface pressure between the respective fastening element and the spring link. This particularly high surface pressure is particularly suitable for transmitting forces that occur in particularly heavy vehicles.

[0028] In a further embodiment, it is provided that the support surfaces at least partially, in particular predominantly or completely, delimit or form a receiving space designed as an undercut or with an undercut. In other words, the receiving space or the undercut is at least partially, in particular predominantly or completely, covered by the support surfaces. The fastening region of the spring link is arranged in the receiving space for the positive connection of the spring link to at least one of the holding parts. This means that the fastening region of the spring link is arranged in the receiving space or the undercut in order to connect the spring link in a positive connection, in particular directly, to at least one of the holding parts, i.e. to form or bring about the positive connection with the at least one of the holding parts.In other words, for the positive connection of the spring link to the first retaining part via the first contact surface and / or to the second retaining part via the second contact surface, the connecting area of ​​the spring link is arranged in the receiving space or the undercut. This allows the spring link to be connected particularly securely to the retaining device. This significantly increases the mechanical load capacity of the wheel suspension. In particular, detachment of the spring link from the retaining device can be particularly reliably prevented.

[0029] Preferably, the fastening region is wedge-shaped, in particular at least partially, predominantly, or completely. In other words, a shape or contour of the spring link at the fastening region is wedge-shaped, i.e., formed as a wedge. This means that the fastening region has a wedge-shaped contour or wedge-shaped form. In particular, the positive connection to the holding device, in particular to the first holding part and / or the second holding part, can be generated or brought about by means of the wedge-shaped contour or shape. As a result, the mechanical load-bearing capacity of the wheel suspension can be particularly increased. In particular, security against the spring element becoming detached from the holding device can be particularly increased.

[0030] In a further embodiment, it is provided that at least one of the holding parts has at least one stop region extending obliquely or perpendicularly to its support surface, against which the spring link bears, in particular directly. In other words, the spring link is supported on the holding device, in particular on the holding parts, via the support surface along a first direction and is supported on the holding device, in particular on the first holding part and / or the second holding part, in a second direction extending obliquely or perpendicularly to the first direction, in particular directly, via the stop region. Thus, for example, the first holding part has a stop region extending obliquely or perpendicularly to the first support surface and / or the second support surface, which stop region can in particular be referred to as the first stop region, wherein the spring link bears, in particular directly, against the first stop region.For example, the second retaining part has a stop region extending obliquely or perpendicularly to the first and / or second support surface, which can be referred to in particular as a second stop region, wherein the spring link abuts against the second stop region, in particular directly. The stop regions, referred to in particular as stops, can serve, in particular as a positive fit, for the second direction, for example, in the transverse direction of the spring link, in particular inwardly, wherein the spring link, for example, abuts against the stop regions without play.For example, in the case of external load peaks, such as those that occur particularly when hitting a curb, a force is transmitted from the vehicle wheel, particularly via the retaining device, to the respective stop areas, without impairing the frictional connection of the force-locking connection, formed, for example, by a screw connection, with the spring link. The respective stop area can significantly increase the mechanical load-bearing capacity of the wheel suspension.

[0031] For example, the first direction, particularly in the installed position of the wheel suspension in the motor vehicle, runs in the vertical direction of the vehicle. For example, the second direction, particularly in the installed position of the wheel suspension in the motor vehicle, runs in the transverse direction of the vehicle. For example, the spring link is supported outwardly via the respective support surface, particularly in the installed position of the wheel suspension in the motor vehicle, at least substantially in the transverse direction of the vehicle.

[0032] In a further embodiment, it is provided that at least one of the contact surfaces has a curvature. This means that the first contact surface of the first fastening element and / or the second contact surface of the second fastening element each has a curvature, i.e. is curved. In other words, the first contact surface and / or the second contact surface is shaped or formed spherically. This can, for example, achieve a uniform surface pressure between the respective fastening element, in particular the respective contact surface, and the spring link. A radius of the curvature is, for example, dimensioned such that, in the force-free state, a gap of a few tenths of a millimeter occurs at the front and rear edges to the spring link when the respective fastening element is in contact, in particular in the center. For example, the radius of the curvature is at least 1000 millimeters, in particular 2000, 4000 or 8000 millimeters.In particular, the radius is in the order of 8,000 millimeters. The curvature can significantly improve the mechanical load-bearing capacity of the wheel suspension.

[0033] In a further embodiment, the leaf spring element or spring link comprises at least one first leaf spring part and at least one respective second leaf spring part formed separately from the first leaf spring part. In other words, the leaf spring element or spring link is formed in multiple parts, in particular in three parts. For example, the first leaf spring part and two second leaf spring parts are provided. Preferably, the respective receiving element is formed exclusively by the respective second leaf spring part, in particular with respect to the first and the respective second leaf spring part.In other words, in particular with regard to the first and the respective second leaf spring part exclusively, the respective second leaf spring part is received or arranged in the respective receiving area of ​​the respective fastening element, whereby the leaf spring element or the spring link and the respective fastening element are positively connected to one another. This means that the positive connection between the leaf spring element and the respective fastening element is brought about, for example, at least indirectly, in particular directly, by the respective second leaf spring part, and is not brought about, for example, by the first leaf spring part. As a result, the positive connection can be brought about in a special way and / or with particularly little effort. In particular, manufacturing costs can be kept particularly low.

[0034] It is preferably provided that the leaf spring parts, in particular the first and the respective second leaf spring part, are fiber-reinforced. In other words, the leaf spring parts have fibers. This means that the respective leaf spring part is formed, for example, by a respective matrix material and respective fibers, which are preferably embedded in the respective matrix material. It is preferably provided that the fibers of the first leaf spring part run, in particular exclusively, in a first direction and the fibers of the respective second leaf spring part run, in particular exclusively, in a second direction running obliquely or perpendicular to the first direction. In other words, the directions of the fibers of the first leaf spring part and the respective second leaf spring part are different.Thus, with respect to the first leaf spring part, for example, additional fiber layers in the form of the respective second leaf spring part are applied to the spring link in the area of ​​an inner clamp, wherein the additional fiber layers run diagonally or transversely to the fibers of the first leaf spring part, for example similar to a belt. The inner clamping can be understood in particular as the clamping effected by means of the fastening elements. The respective fibers of the respective leaf spring part are, for example, unidirectional fibers, which can be referred to in particular as UD fibers. The fiber-reinforced leaf spring parts or the fibers running diagonally or perpendicular to one another enable the form fit to be achieved particularly securely. Furthermore, the manufacturing effort can be kept particularly low.

[0035] For example, the first direction, particularly in the installed position of the wheel suspension in the motor vehicle, runs at least substantially in the transverse direction of the motor vehicle. For example, the second direction, particularly in the installed position of the wheel suspension in the motor vehicle, runs at least substantially in the longitudinal direction of the motor vehicle.

[0036] In a further embodiment, it is provided that the leaf spring element or the spring link has at least one local material thickening formed integrally with a base body of the leaf spring element or the spring link. In other words, the leaf spring element, and in particular its base body, is locally thickened in the form of the respective material thickening, in particular in the respective clamping region. Preferably, the respective receiving element is formed at least partially, in particular completely, by the respective material thickening. In other words, the respective local material exposure is arranged or received in the respective receiving region, whereby the leaf spring element and the respective fastening element are positively connected to one another, in particular at least indirectly or directly. The base body is, for example, the first leaf spring part.For example, the respective material thickening is formed, in particular exclusively, by matrix material. This means that the respective material thickening comprises, for example, additional matrix material and can in particular be free of fibers. Thus, for example, a local variation in the fiber volume content of the leaf spring element can be effected or brought about by the respective material thickening. The respective material thickening can achieve a particularly secure and / or particularly low-cost form fit. Furthermore, the manufacturing costs can be kept particularly low.

[0037] The fact that the base body and the respective local material thickening are formed as a single piece can be understood in particular to mean that the base body and the respective material thickening, in particular together, are formed from a single piece, for example, a monoblock. This means that the base body and the respective material thickening are not formed separately from one another and are connected to one another, in particular subsequently.

[0038] In a further embodiment, at least one film provided with particles, in particular diamond particles or particles made of similarly hard materials such as silicon carbide or corundum, is provided, which is arranged, in particular directly, between the spring link and the fastening device, in particular the first fastening element and / or the second fastening element, and / or, in particular directly, between the spring link and the holding device, in particular the first holding part and / or the second holding part. The film is thus provided with diamond particles and / or silicon carbide particles and / or corundum particles or the like. In other words, the film is arranged between the spring link and at least a partial area of ​​one of the contact surfaces of the fastening device or one of the bearing surfaces of the holding device. In particular, the film lies directly against the spring link.In particular, the film lies directly on the holding device or the fastening device.

[0039] Thus, for example, a film provided with particles, which can in particular be referred to as the first film, is arranged between the spring link and the fastening device, in particular the first or second fastening element. For example, the first film directly contacts the spring link and / or the fastening device. Alternatively or additionally, at least one film provided with particles, which can in particular be referred to as a further film, is arranged between the spring link and the holding device, in particular the first or second holding part. For example, the further film directly contacts the spring link and / or the holding device.

[0040] For example, a respective first film provided with particles is arranged between the spring link and the respective fastening element, in particular in direct contact with the respective fastening element and / or the spring link. For example, a respective further film provided with particles is arranged between the spring link and the respective holding part, in particular in direct contact with the respective holding part and / or the spring link.

[0041] The particles can be understood in particular as diamond particles and / or corundum particles and / or silicon carbide particles or the like. The particles can press into the surfaces of both friction partners, for example under screw preload, whereby a micro-form fit can be created, which can particularly increase the effective coefficient of friction between the two friction partners. Depending on the arrangement of the film, the friction partner can be understood as the spring link and at least one of the fastening elements and / or the spring link and at least one of the holding parts. The particles have, for example, a diameter of, in particular, approximately 100 μm. In particular, the respective frictional connection can be particularly improved by means of the particles, whereby the mechanical load-bearing capacity of the wheel suspension can be particularly increased.The fact that the, in particular respective, film is provided with the particles can be understood in particular to mean that the, in particular respective, film has the particles, in particular that the particles are incorporated into the, in particular respective, film, for example in a surface of the, in particular respective, film.

[0042] In a further embodiment, it is provided that the, in particular respective, film is or will be pressed, for example for preconditioning, with the fastening device, in particular with the first fastening element and / or the second fastening element, or with the holding device, in particular with the first holding part and / or second holding part. In other words, the film is or will be pressed, in particular for preconditioning, at least with the partial area. Thus, for example, the, in particular respective, first film can be or will be pressed with the respective fastening element and / or the, in particular respective, further film can be or will be pressed with the respective holding part.By pressing, the particles can be pressed into the holding device or the fastening device, the material of which is, for example, harder than a material of the spring link, which is made of the fiber composite material, for example. This can prevent or reduce the exclusive or predominant incorporation of the particles into a surface of the spring link. This can particularly improve the respective frictional connection. Pressing can be understood in particular as meaning that the respective film is placed onto the respective fastening element or the respective fastening part, in particular directly, and is pressed down with a surface pressure of, for example, at least 60 megapascals, in order to ensure in particular a sufficient or particularly good form fit and / or friction fit.

[0043] In a further embodiment, at least one plastic film different from the film is provided, which is arranged between the spring link and the fastening device and / or between the spring link and the holding device, at least in some areas, without overlapping with the, in particular the respective, film. In other words, the at least one plastic film is arranged between the spring link and a second partial area of ​​one of the contact surfaces or one of the support surfaces, which second partial area is different from the partial area and in particular adjoins the partial area at least directly or indirectly.The fact that the plastic film is free of overlap with the film can be understood in particular to mean that an overlap of the film and the plastic film is avoided or is avoided at least in some areas, i.e. that the film and the plastic film are, for example, arranged next to one another, at least in some areas, not on top of one another.

[0044] For example, at least one respective first plastic film is arranged between the spring link and the respective fastening element, without overlapping the respective film or the respective first film. For example, at least one respective further plastic film is arranged between the spring link and the respective holding part, at least partially without overlapping the respective film or the respective further film. The plastic films are different from the film provided with the particles. The plastic film or the first and / or the further plastic film is or are formed, for example, from acrylonitrile butadiene styrene (ABS).The respective plastic film allows stress peaks on the surface of the spring link, particularly in the fiber composite material, which may still occur despite optimized design of the respective contact surfaces or bearing surfaces, to be distributed over a particularly large area. In particular, the plastic film is positioned in the area of ​​highest surface pressure, particularly embedded in a matrix material. Furthermore, the particularly tough and / or abrasion-resistant material of the plastic film can particularly reduce wear in areas where relative movement occurs between the fastening device or the holding device and the spring link.

[0045] It is preferably provided that the, in particular respective, film extends at least partially into a, in particular respective, recess in the plastic film. In other words, the, in particular respective, film is arranged at least partially in the, in particular respective, recess in the plastic film. For example, the respective first film extends at least partially into a recess in the respective first plastic film. For example, the respective second film extends at least partially into a recess in the respective second plastic film. The recess can be understood in particular as a material recess. As a result, a respective coefficient of friction can be increased by means of the respective film, in particular locally, and wear can be particularly minimized in the recess or in the region of the recess, in particular locally, by means of the plastic film.

[0046] In a further embodiment, at least one bearing device is arranged at the first bearing point, via which the spring link, in particular via the fastening device, can be or is coupled in an articulated manner to the structure, in particular the body and / or the chassis, of the motor vehicle. In other words, the second bearing point is designed as the bearing device. The bearing device is, for example, a rubber bearing.

[0047] For example, it is provided that between the bearing device and the fastening device, in particular the first and / or the second fastening element, at least one film provided with particles, in particular diamond particles and / or silicon carbide particles and / or corundum particles, is arranged, which can in particular be referred to as an intermediate film. In other words, the bearing device is connected to a first side of the intermediate film, and the fastening device is connected to a second side of the intermediate film, which is different from the first side and in particular opposite the first side. In particular, the fastening device is supported on the bearing device via the film, for example directly.The intermediate film coated with particles can significantly increase the coefficient of friction between the bearing assembly and the fastening device, thereby significantly improving the frictional connection between the bearing assembly and the fastening device. This can significantly improve the mechanical load-bearing capacity of the wheel suspension.

[0048] Alternatively or additionally, it is provided, for example, that a bearing part of the bearing device, in particular one different from a screw element, which is arranged on the fastening device, in particular directly, is connected at least positively to the fastening device, in particular to the first and / or the second fastening element. In other words, to fasten the bearing device, in particular the bearing part, to the fastening device, at least one positive connection is provided between the bearing part and the fastening device, which can be designed, for example, as a cylindrical bushing, a conical seat or a ball seat. This can prevent the available frictional force between the two friction partners from becoming insufficient in the event of an overload, which could lead to the connection slipping. This can particularly improve the mechanical load-bearing capacity of the wheel suspension.

[0049] A further aspect relates to a motor vehicle having at least one wheel suspension according to the invention. Advantages and advantageous embodiments of the invention are to be regarded as advantages and advantageous embodiments of the further aspect, and vice versa. Also disclosed is a method for producing the wheel suspension according to the invention, in particular of the motor vehicle.

[0050] Numerals such as "first," "second," "third," etc., are intended solely for differentiation and do not indicate any order. This means that the corresponding numerals can be interchanged at will.

[0051] Further features of the invention emerge from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective specified combination, but also in other combinations or on their own.

[0052] The invention will now be explained in more detail using a preferred embodiment and with reference to the drawings. They show:

[0053] Fig. 1 is a schematic perspective view of an inventive

[0054] wheel suspension; and

[0055] Fig. 2 is a schematic partial view of an inventive

[0056] Wheel suspension from below; and

[0057] Fig. 3 is a schematic and perspective partial view of a wheel suspension according to the invention; and Fig. 4 is a schematic partial sectional view of a wheel suspension according to the invention.

[0058] wheel suspension; and

[0059] Fig. 5 is a further schematic partial sectional view of an inventive

[0060] wheel suspension; and

[0061] Fig. 6 is a further schematic partial sectional view of an inventive

[0062] wheel suspension; and

[0063] Fig. 7 is a further schematic partial sectional view of an inventive

[0064] wheel suspension; and

[0065] Fig. 8 is a further schematic partial sectional view of an inventive

[0066] wheel suspension; and

[0067] Fig. 9 is a further schematic partial sectional view of an inventive

[0068] wheel suspension; and

[0069] Fig. 10 schematic and perspective partial views of a wheel suspension according to the invention; and

[0070] Fig. 11 is a schematic and perspective partial view of an arrangement of at least one manufacturing aid on a wheel suspension according to the invention; and

[0071] Fig. 12 is a schematic plan view and a schematic partial sectional view of a manufacturing aid; and

[0072] Fig. 13 is a further schematic partial sectional view of the manufacturing aid from Fig. 13; and

[0073] Fig. 14 is a schematic plan view of a film and a plastic film of a wheel suspension according to the invention; and Fig. 15 is a schematic plan view of a film and a plastic film of a wheel suspension according to the invention according to a further embodiment; and

[0074] Fig. 16 is a schematic partial sectional view of an inventive

[0075] Wheel suspension according to a further embodiment; and

[0076] Fig. 17 is a schematic partial sectional view of an inventive

[0077] Wheel suspension according to a further embodiment; and

[0078] Fig. 18 is a schematic front view of a spring link of a wheel suspension according to the invention to illustrate a bending of the spring link; and

[0079] Fig. 19 is a schematic partial sectional view of an inventive

[0080] Wheel suspension according to a further embodiment; and

[0081] Fig. 20 is a schematic partial sectional view of an inventive

[0082] Wheel suspension according to another embodiment.

[0083] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0084] Fig. 1 shows a schematic perspective view of a wheel suspension 1 for a motor vehicle. Fig. 2 shows the wheel suspension 1 in a schematic partial view from below. Fig. 3 shows the wheel suspension 1 in a schematic and perspective partial view.

[0085] In the exemplary embodiment, the wheel suspension 1 is designed as a wheel suspension for a rear axle of the motor vehicle. Thus, the wheel suspension 1 is arranged, for example, in a rear region of the motor vehicle. Alternatively, the wheel suspension 1 is designed, for example, as a wheel suspension for a front axle of the motor vehicle. In particular, the wheel suspension 1 is designed for a driven axle, in particular a driven rear axle, of the motor vehicle. The wheel suspension 1 has at least one spring link 2, which is provided or designed to guide at least one vehicle wheel and is designed as a leaf spring element 3. A main direction of extension of the spring link 2 or of the leaf spring element 3 preferably runs in the transverse direction y of the motor vehicle. Therefore, the spring link 2 or the leaf spring element 3 can be referred to, for example, as a transverse leaf spring.

[0086] The wheel suspension 1 has at least one fastening device 4 formed separately from the spring link 2. In the exemplary embodiment shown in Fig. 1 and Fig. 3, two fastening devices 4, 5 are provided. Thus, the wheel suspension 1 has, for example, a first fastening device 4 and a second fastening device 5 formed separately from the first fastening device 4 and, in particular, spaced apart from the first fastening device 4 in the vehicle transverse direction y. The fastening devices 4, 5 are preferably formed separately from the spring link 2. The respective fastening device 4, 5 each has at least two respective fastening elements 6, 7 formed separately from one another. The respective fastening element 6, 7 each has a respective contact surface 8, 9, between which the spring link 2 is arranged.Thus, the respective first fastening element 6 has, for example, a respective first contact surface 8 and the respective second fastening element 7 has, for example, a respective second contact surface 9. In the exemplary embodiment, the spring link 2 is supported upwards in the vertical direction z of the motor vehicle, in particular via the respective first contact surface 8, on the respective first fastening element 6. The spring link 2 is supported downwards in the vertical direction z of the vehicle via the respective second contact surface 9 on the respective second fastening element 6. Via the contact surfaces 8, 9, the spring link 2 is connected at least force-fittingly, in particular directly, to the respective fastening device 4, 5, in particular to the respective fastening elements 6, 7.

[0087] The respective fastening device 4, 5 each has a respective first bearing point 10. A respective first bearing device 11, which is designed, for example, as a rubber bearing, is preferably arranged at the respective first bearing point 10. The spring link 2 can be or is coupled in an articulated manner to at least one component 12 of a structure, in particular a body and / or a chassis, of the motor vehicle via the respective first bearing point 10, in particular via the respective first bearing device 11, in particular via the respective fastening device 4, 5. The component 12 is designed, for example, as a cross bridge of a rear axle support of the motor vehicle.

[0088] The wheel suspension 1 has at least one holding device 14 which is formed separately from the spring link 2 and the respective fastening device 4, 5. In the exemplary embodiment, the wheel suspension has two holding devices 14, 15 which are formed separately from one another and are spaced from one another in particular in the vehicle transverse direction y. The holding devices 14, 15 are formed separately from the spring link 2 and the fastening devices 4, 5. The respective holding device 14, 15 each has two respective holding parts 16, 17. The respective holding device 14, 15 is illustrated, for example, in Fig. 2. Fig. 4 and Fig. 5 each show a respective schematic partial sectional view of the wheel suspension 1, wherein the respective holding device 14, 15 is illustrated in Fig. 4 and Fig. 5.

[0089] The respective holding part 16, 17 each has a respective support surface 18, 19, between which the spring link 2 is arranged. Thus, the respective first holding part 16 has, for example, a respective first support surface 18 and the respective second holding part 17 has, for example, a respective second support surface 19. In the exemplary embodiment, the spring link 2 is supported, for example, upwards in the vehicle vertical direction z, in particular via the respective support surface 18, on the respective first holding part 16. For example, the spring link 2 is supported downwards in the vehicle vertical direction z, in particular via the respective second support surface 19, on the respective second holding part 17. The spring link 2 is connected, in particular directly, at least force-fittingly to the respective holding device 14, 15 via the support surfaces 18, 19.

[0090] The respective holding device 14, 15 each has a respective second bearing point 20, at which a respective second bearing device 21 is preferably arranged, which is designed, for example, as a respective rubber bearing. The spring link 2 is connected or can be connected to a respective wheel carrier 22 via the respective second bearing point 20, in particular via the respective second bearing device 21, in particular directly. The respective wheel carrier 22 is illustrated, for example, in Fig. 1 and Fig. 2. At least one respective vehicle wheel of the motor vehicle is held or is to be held on the respective wheel carrier 22. Thus, the spring link 2 can be coupled or is coupled in an articulated manner to the respective vehicle wheel via the respective second bearing point 20, in particular via the respective second bearing device 21.Thus, the spring link 2 is connected, for example, via rubber bearings on the one hand to the wheel carriers 22 and on the other hand to the body.

[0091] The respective fastening element e, 7 is preferably designed as a respective clamping element. This means that the force-fitting connection between the spring link 2 and the fastening elements 6, 7 is a respective clamping connection. Preferably, the fastening elements 6, 7 of the respective fastening device 4, 5 are screwed together, in particular to effect the clamping connection, i.e., connected to one another by means of at least one screw element 23. The at least one screw element 23 is preferably arranged outside the spring link 2. This means that the at least one screw element 23 does not extend through the spring link 2, so that the screw connection between the respective fastening elements 6, 7 is formed, for example, bypassing the spring link 2.

[0092] Preferably, the respective holding part 16, 17 is designed as a respective clamping part. This means that the force-locking connection of the holding parts 16, 17 of the respective holding device 14, 15 is a respective clamping connection. Preferably, the holding parts 16, 17 of the respective holding device 14, 15 are screwed together, in particular to effect or form the clamping connection, i.e., connected to one another by means of at least one screw element 24. The screw connection runs, for example, through the spring link 2. Thus, in particular, the spring link 2 is screwed to the respective holding parts 16, 17 by means of the at least one screw element 24.

[0093] In the exemplary embodiment, the respective holding device 14, 15 is arranged further outward in the vehicle transverse direction y than the respective fastening device 4, 5. As a result, the fastening devices 4, 5 can be understood, in particular, as an inner bearing of the spring link 2, and the fastening elements 6, 7 can be understood, in particular, as inner clamping elements. The respective holding device 14, 15 can be understood, in particular, as a respective outer bearing of the spring link 2, and the holding parts 16, 17 can be understood, in particular, as outer clamping parts.

[0094] In the exemplary embodiment shown in Fig. 2, the wheel suspension 1 has two spring and / or damper devices 25 formed separately from the spring link 2. The respective spring and / or damper device 25 is arranged, in particular directly, on the respective wheel carrier 22. The respective vehicle wheel can be supported or is supported on the body 13 in a sprung and / or damped manner via the respective spring and / or damper device 25. Thus, in the exemplary embodiment shown in Fig. 1, in particular, a driven or drivable damper strut rear axle with a wheel-guiding transverse leaf spring is shown.

[0095] In order to be able to particularly increase the mechanical load-bearing capacity of the wheel suspension 1, it is provided that the respective first fastening element 6 has at least one respective receiving opening 26 and the respective second fastening element 7 has a respective connecting part 27. The respective connecting part 27, and in particular the respective receiving opening 26, is not designed as a respective screw element, and in particular not as the respective first screw element 23 or the respective second screw element 24. The respective connecting part 27 is arranged in the respective receiving opening 26 to form a respective positive connection, which can in particular be referred to as a first positive connection 27a, between the fastening elements 6, 7 of the respective fastening device 4, 5. This is illustrated in Fig. 6, which shows a schematic partial sectional view of the wheel suspension 1.Thus, for example, so that the second fastening element 7, designed as the respective lower clamping part, can contribute to supporting lateral forces, a respective positive connection is provided between the fastening elements 6, 7 of the respective fastening device 4, 5. In this case, for example, similar to a tongue and groove connection, a projection in the lower clamping element can engage in a precisely fitting recess in the upper clamping element, whereby the two clamping elements can thus be fixed to one another with almost no play, for example in the vehicle transverse direction y. Thus, the connecting part 27 is preferably the projection and the receiving opening 26 is preferably the precisely fitting recess.For a particularly secure transmission of transverse forces, a frictional force is provided which is built up by the respective frictional connection and which can be supported by the respective second contact surface, which is designed, for example, as the respective lower clamping surface, through its preload force in conjunction with a friction value.

[0096] In order to be able to particularly increase the mechanical load-bearing capacity of the wheel suspension, it is alternatively or additionally provided that the respective holding parts 16, 17 are each formed separately from one another and at least the respective support surface 18, 19 of one of the respective holding parts 16, 17 is connected, in particular directly, to the spring link 2 in a form-fitting manner. In the exemplary embodiment shown in Fig. 4 and Fig. 5, the respective first support surface 18 and the respective second support surface 19 of the respective holding part 16, 17 of the respective holding device 14, 15 are each connected, in particular directly, to the spring link 2 in a form-fitting manner. This means that the respective support surfaces 18, 19 are connected to the spring link 2 by means of a second form-fitting connection 2b. This second form-fitting connection 2b can act as overload protection for outward forces that attempt to pull the spring link 2 out of the respective holding device 14, 15.Overall, it can be seen that the wheel suspension 1 can achieve a particularly advantageous force introduction for a spring-link axle.

[0097] In the exemplary embodiment shown in Fig. 5, it is provided that the support surfaces 18, 19 of the respective holding device 14, 15 at least partially delimit a receiving space 29 formed as a respective undercut 28, in which a respective fastening region 2a of the spring link 2 is arranged for the positive connection of the spring link 2 to at least one of the holding parts 16, 17 of the respective holding device 14, 15, in particular to both respective holding parts 16, 17 of the respective holding device 14, 15. Preferably, the respective fastening region 2a is wedge-shaped. This means that the spring link has a wedge-shaped contour in the region of the respective fastening region 2a.

[0098] In a further embodiment, it is provided that at least one of the respective holding parts 16, 17, in particular the respective first and / or the respective second holding part 16, 17, of the respective holding device 14, 15 each has a respective stop region 30, 31 extending obliquely or perpendicular to the respective support surface 18, 19 of the respective holding part 16, 17, against which the spring link 2 rests, in particular directly. In the exemplary embodiment, the respective first holding part 16 has a respective first stop region 30 and the respective second holding part 17 has a respective second stop region 31. The spring link 2 can be supported or is supported outwards in the vehicle transverse direction y on the respective stop region 30, 31.

[0099] In order to ensure even distribution of a particularly required screw preload force, at least two, in particular three or four, screw elements 24 are provided, each of which is or will be screwed into threaded blind holes in the respective first holding part 16. Such a solution can dispense with the need for separate nuts. Furthermore, the respective screw connection or a respective screw connection area can be particularly reliably protected against corrosive attack, i.e. against corrosion. Preferably, a respective toe-in adjustment is provided, which is arranged or formed, for example, at the connection of the second bearing device 21 or at the second bearing point 20. The toe-in adjustment is or will be realized, for example, via a respective eccentric screw 32.For example, the respective eccentric screw 32, in particular together with an associated eccentric disk, is supported, in particular directly, in at least one respective groove in the respective first holding part 16 and / or in the respective second holding part 17. In order to provide sufficient installation space for a torque wrench when tightening the respective eccentric screw 32 or the respective eccentric screw connection, the respective second holding part 16 can have a large, for example barrel-shaped, recess that can ensure sufficient rigidity for the loads occurring there. For an adjustment path, for example, elongated holes are provided, which extend, for example, substantially in the vehicle transverse direction y.In order to be able to compensate for thickness tolerances in the spring link 2, the respective elongated hole can, in particular additionally, be designed in the vehicle vertical direction z, in particular somewhat, for example by a few tenths of a millimeter, larger than a respective screw diameter of the respective eccentric screw 32. Otherwise, for example, thickness tolerances, in contrast to a one-piece or one-piece holding device, cannot influence, in particular negatively, a stress on the respective holding parts 16, 17.

[0100] As can be seen particularly clearly in Fig. 2, for example, it is provided that the respective wheel carrier 22 is connected in an articulated manner to the respective holding device 14, 15, for example via two of the second bearing devices 21, which are designed in particular as rubber bearings. The second bearing devices 21 are preferably arranged at an angle to one another, in particular in a V-shape. This makes it possible to achieve the desired behavior for toe-in changes and / or camber changes during compression and rebound. The respective second bearing device 21 is preferably pressed into the respective wheel carrier 22.

[0101] The spring link 2 is preferably formed from a fiber composite material, for example a carbon fiber composite material or a glass fiber composite material. Preferably, the respective fastening element e, 7 is not designed as a shell construction, but rather, for example, is solid. For example, the respective first fastening element 6 has a U-shaped profile, i.e., the respective first fastening element 6 is U-shaped at least in some areas. For example, the respective fastening element 6, 7 is formed at least in some areas, in particular completely, from a metallic material, in particular from steel or aluminum. In particular, the respective fastening element e, 7 is designed as a cast part or as a forged part.In this way, a sufficiently high surface pressure can be achieved between the respective fastening element e, 7 and the spring link 2, so that the surface pressure is particularly well suited to transmitting the particularly high forces that occur in particularly heavy vehicles. This can lead to a conflict of objectives between the highest possible surface pressure in the interests of operational reliability on the one hand and the stresses that occur in the matrix material of the fiber composite material of the spring link 2 on the other. In particular, transverse tensile stresses and / or compressive stresses and / or shear stresses must not exceed limits specified by the material. Conventional screw connections can exhibit large fluctuations in the achieved or achievable screw preload force at the same tightening torque, depending on the prevailing friction coefficient.In order to nevertheless be able to transmit the occurring forces particularly reliably and / or to avoid exceeding material limits, the respective screw connection, in particular the screw connection effected by means of the at least one first screw element 23 and / or by means of the at least one second screw element 24, is designed such that, for example, a relatively small screw dimension is initially selected, which is then tightened excessively. In other words, the at least one respective first screw element 23 and / or the at least one respective second screw element 24 is tightened excessively. A combination of joining torque and further rotation angle can be specified so that it can be ensured that an elastic yield point of a respective screw material is exceeded.By further rotating the screw, a deformation can be applied at which a stress in the screw shaft lies between a yield point and a yield strength. The effective screw preload force can therefore remain approximately constant regardless of the coefficient of friction. This allows operating loads to be transmitted and overloading of the matrix material can be avoided particularly reliably. This is illustrated, for example, in Fig. 7, which shows a respective schematic partial sectional view of the wheel suspension 1. Preferably, at least one of the respective contact surfaces 8, 9, in particular the respective first contact surface 8 and / or the respective second contact surface 9, each has a respective curvature 33. In other words, contact surfaces of the holding parts 16, 17 to the spring link 2 are spherically shaped to achieve uniform surface pressure. This is shown in Fig.8, in which a schematic partial sectional view of the wheel suspension 1 is shown.

[0102] Fig. 9 shows the wheel suspension 1 in a schematic partial sectional view. For example, the respective contact surface 8, 9 has a respective radius 34, which differs in particular from the curvature 33 and is, for example, 100 millimeters. The radius 34 can help to reduce edge wear during the compression and rebound movement of the spring link. This refers to stress peaks that can occur between the edges of the respective fastening element 6, 7 and the spring link 2 with particularly large wheel travel of the vehicle wheel. A particularly large radius at the edge of the respective contact surface 8, 9 of the respective fastening element 6, 7 on the spring link 2 in the order of 100 millimeters, in particular with a second radius 35 of a few millimeters, different from the radius 34, on a respective outer edge of the respective fastening element 6, 7, has proven to be effective.Thus, for example, the second radius 35 is arranged on the respective outer edge of the respective fastening element 6, 7, in particular on the respective contact surface 8, 9.

[0103] The dimensioning of the fastening elements 6, 7 can depend significantly on the operating loads to be transmitted and the friction values ​​present in the respective contact surface 8, 9, which is particularly referred to as the contact surface. Particularly in the case of small, lightweight components with little impact on package and weight, it can therefore be expedient to provide friction-increasing measures. These friction-increasing measures can be, in particular, particularly thin, films 36, 37, 38, 39 containing particles that can be inserted between the clamping partners to be screwed together. Thus, the wheel suspension 1 has, for example, at least one film 36, 37, 38, 39 provided with particles, in particular diamond particles, silicon carbide particles and / or corundum particles, which is arranged between the spring link 2 and the respective fastening device 4, 5 and / or the respective holding device 14, 15.

[0104] In the exemplary embodiment shown in Fig. 10, in which two schematic and perspective partial views A, B of the wheel suspension 1 are shown, a plurality of foils 36, 37, 38, 39, which are provided with particles, in particular with diamond particles, silicon carbide particles and / or corundum particles and which are in particular different from one another, are provided. A respective first of the foils 36 is arranged between the spring link 2 and the respective first fastening element 6. The first foil 36 preferably directly contacts the spring link 2 and / or the fastening element 6. A respective second of the foils 37 is arranged between the spring link 2 and the respective second fastening element 7. The respective second foil 37 preferably directly contacts the spring link 2 and / or the respective second fastening element 7. The respective foil 36, 37 is, for example, rectangular in shape or formed as a respective rectangular section.The respective film 36, 37 is preferably arranged in the region of the highest surface pressure. A respective third of the films 38 is arranged between the spring link 2 and the respective first holding part 16. For example, the respective third film 38 directly touches the spring link 2 and / or the respective first holding part 16. A respective fourth of the films 39 is arranged between the spring link 2 and the respective second holding part 17. For example, the respective fourth film 39 directly touches the spring link 2 and / or the respective second holding part 17. For example, the respective film 38, 39 is disc-shaped and in particular arranged around the respective screw element 24.

[0105] However, particularly when combining aluminum or steel with a fiber composite material, the problem can arise that the hardness of the two friction partners can differ greatly. Without further measures, the particles could therefore imprint almost exclusively into the soft material, in this case the matrix of the fiber composite material, and thus fail to form a sufficient bond with the harder material of the fastening device 4, 5 and / or the holding device 14, 15. To avoid this, preconditioning of the respective films 36, 37, 38, and / or 39, particularly on the harder friction partner, can be performed.The respective film 36, 37, 38 and / or 39 can be placed on the respective fastening element 6, 7 or on the respective holding part 16, 17 and pressed down with a surface pressure of, for example, at least 60 megapascals in order to ensure sufficient form-fitting. This surface pressure can be generated, for example, either using a hydraulic press or by screwing it to the respective screw element 23, 24, which is intended to connect both friction partners. In this case, it is particularly important to ensure that the screw connection is designed for the maximum permissible surface pressure of the matrix material, whereby this surface pressure is, for example, significantly below the value required for preconditioning the respective film 36 to 39 which increases the friction value.In other words, at least one of the films 36 to 39 is pressed onto the fastening device 4, 5 or the holding device 14, 15, in particular for preconditioning the respective film 36 to 39. For example, the respective first film 36 is pressed onto the respective first fastening element 6. For example, the second film 37 is pressed onto the respective second fastening element 7. For example, the respective third film 38 is pressed onto the respective first holding part 16. For example, the respective fourth film 39 is pressed onto the respective second holding part 17.

[0106] The preconditioning or pressing is carried out, for example, by means of a production aid 40, which is designed, for example, as a pressure piece. The production aid can be understood, in particular, as a tool. Fig. 11 shows, by way of example, an arrangement of two such pressure pieces on the respective holding device 14, 15, in particular on the respective second holding part 17. Fig. 12 shows the production aid 40 in a plan view C and in a schematic partial sectional view D, which runs between cutting reference points E. The production aid 40 has, for example, in particular on one surface, a groove structure 41, i.e., a plurality of grooves. Fig. 13 shows the production aid 40 in a schematic partial sectional view, in which the groove structure 41 can be seen particularly well. This partial sectional view is a section which runs between cutting reference points E, which in Fig.12. The groove structure 41 allows each contact surface to be reduced by approximately half, thereby ensuring that the required surface pressure for preconditioning can be achieved particularly reliably. Using two pressure pieces with offset grooves whose contact surfaces overlap, the present component screw connection allows the entire surface of the respective friction-increasing foil 36 to 39 to be preconditioned with sufficient surface pressure in two clamping operations. In particular, the preconditioning can be carried out by screwing the respective pressure piece.

[0107] In a further embodiment, at least one plastic film 42, 43, 44, 45 is provided which is different from the respective film 36 to 39 and is arranged between the spring link 2 and the fastening device 4, 5 or the holding device 14, 15, at least in some areas, without overlapping with the respective film 36 to 39. In the exemplary embodiment, a respective first plastic film 42 is arranged between the spring link 2 and the respective first fastening element 6. The first plastic film 42 is arranged at least in some areas, in particular completely, without overlapping with the first film 36. A respective second plastic film 42 is arranged between the spring link 2 and the respective second fastening element 7, which at least in some areas does not overlap with the second film 37.Between the spring link 2 and the respective first holding part 16, at least one respective third plastic film 44 is arranged, which at least partially overlaps with the third film 38. Between the spring link 2 and the respective second holding part 17, at least one fourth plastic film 45 is arranged, which at least partially overlaps with the fourth film 39. The plastic films 42 to 45 are preferably different from one another and, in particular, spaced from one another. The respective plastic films 42 to 45 are formed, for example, from ABS. Wear protection of the spring link 2, in particular of the matrix material, can be achieved by means of the respective plastic films 42 to 45.

[0108] It may be expedient to arrange the friction-increasing measures, particularly in the form of the respective films 36 to 39, in the area of ​​the highest surface pressure in order to be able to transmit the highest possible forces. On the other hand, wear protection of the spring link 2, in particular of the matrix material, by the plastic films 42 to 45 can also be particularly important in the same area. Because the respective plastic films 42 to 45 are arranged at least partially without overlap with the respective films 36 to 39, the films 36 to 39 and the plastic films 42 to 45 are not arranged, for example, in particular directly, one above the other. This can prevent a particularly low hardness of the respective plastic films 42 to 45 from impairing the effect of the friction-increasing measures.This means, for example, that the particles can be prevented from penetrating primarily into the plastic film 42 to 45, which would prevent a sufficient form fit with the, in particular metallic, clamping parts or clamping elements. Preferably, the respective film 36 to 39 extends at least partially into a respective recess 46 of the respective plastic film 42 to 45. This means, for example, that the first film 36 extends into at least one recess 46 of the first plastic film 42. For example, the second film 37 extends at least partially into at least one recess in the second plastic film 43. For example, the third film 38 extends at least partially into at least one recess in the third plastic film 44. For example, the fourth film 39 extends at least partially into a recess in the fourth plastic film 45.In this way, a compromise can be found which gives priority to the protection or wear protection of the spring link 2, so that in the area of ​​the highest stress peaks, for example, the respective plastic film 42 to 45 is arranged and, for example, directly next to it, the respective friction-increasing film 36 to 39.

[0109] Fig. 14 shows the first film 36 and the first plastic film 42 in a schematic plan view. Fig. 15 shows the second film 37 and the second plastic film 43 in a schematic plan view. In particular, the first film 36 and the first plastic film 42 are arranged, in particular directly, on an upper side of the spring link 2 with respect to the vehicle vertical direction z. For example, the second film 37 and the second plastic film 43 are arranged, in particular directly, on an underside of the spring link 2 with respect to the vehicle vertical direction z. As can be seen from a combination of Fig. 14 and Fig. 15, different arrangements or shapes of the films 36, 37 and the plastic films 42, 43 can be provided due to different stresses for the upper side and the underside of the spring link 2.For example, the plastic films 42, 43 differ with respect to their recess 46 or their respective recesses 46. This means that, for example, a respective shape and / or a respective position of the respective recess 46 is different for the plastic films 42, 43, in particular for each of them. In particular, a respective shape of the films 36, 37 is different.

[0110] For example, at least one friction-increasing measure is also provided at the connection of the spring link 2 to the structure 13 or the component 12. For example, at least one foil provided with particles, in particular with diamond particles, silicon carbide particles, and / or corundum particles, is arranged between the respective first bearing device 11 and the respective fastening device 4, 5, which foil can in particular be referred to as a fifth foil. The fifth foil is, for example, annular. Thus, for example, the respective fifth foil can be inserted between a bearing part 47, in particular designed as an inner sleeve, of the respective first bearing device 11 and the respective fastening device 4, 5, in particular similar to the foils 36 to 39.The fifth film can, for example, penetrate with its particles under screw pretensioning force into both friction partners, i.e. into the respective fastening device 4, 5, in particular into the respective first and / or second fastening element 6, 7, and into the respective first bearing device 11, in particular into the respective bearing part 47. This can bring about a micro-form fit. Here, too, for example, preconditioning of the fifth film with respect to the harder material, in this case the respective first bearing device 11, is provided, in particular in that an inner bushing of the respective bearing device 11, which is designed, for example, as a rubber bearing, can be formed, for example, from steel.

[0111] Alternatively or additionally, the bearing part 47 of the respective first bearing device 11, which is arranged, in particular directly, on the respective fastening device 4, 5, can be or become connected at least positively, in particular directly, to the respective fastening device 4, 5, in particular to the respective first and / or second fastening element 6, 7. This means that, for example, at least a third positive connection 48 can be provided between the first bearing device 11, which is designed, for example, as a rubber bearing, in particular the inner bushing, and a contact surface on the respective fastening device 4, 5. The third positive connection 48 can, for example, be realized by means of a conical seat, which is illustrated by way of example in Fig. 16, which shows a schematic partial sectional view of the wheel suspension 1. Alternatively, the positive connection 48 can, for example, be brought about by means of a ball seat, which is shown in Fig.17 is shown as an example, which shows a schematic partial sectional view of the wheel suspension 1. Alternatively, the positive locking 48 can be realized, for example, by means of a cylindrical bushing.

[0112] Fig. 18 shows the spring link 2 in a schematic front view, in which a bend of the spring link 2 is illustrated. For package optimization, in particular for a region of the spring link 2 between the respective fastening device 4, 5 and the respective holding device 14, 15, it is preferably provided that a contour of the spring link 2 in this region is designed such that, in the force-free state, an approximately straight connection between the two bearings, i.e. between the respective fastening device 4, 5 and the respective holding device 14, 15, is present.In other words, a respective first region 49, which extends between the first fastening device 4 and the first holding device 14, and / or a second region 50, which in particular is different from the first region 49 and extends between the second fastening device 5 and the second holding device 15, is located on a, in particular respective, imaginary straight line, in particular relative to a vehicle longitudinal direction x of the motor vehicle viewed from the front and / or from the rear. The respective region 49, 50 can be understood in particular as a respective partial region of the spring link 2. A bending line of the spring link 2 preferably deviates from the, in particular respective straight line during compression in the vehicle's vertical direction z downwards and / or during rebound in the vehicle's vertical direction z upwards, and thus avoids bottlenecks to adjacent components.In other words, in the loaded state, the spring link 2 has a shape in the first and / or second region 49, 50 that differs from a straight line. In particular, a central region of the spring link 2 arranged between the regions 49, 50 in the vehicle transverse direction y deviates from the straight line in the normal position, in particular downwards in the vehicle vertical direction z. The normal position is, for example, not a load-free state, since a static wheel load can act. As a result, a height dimension chain that is particularly relevant for the rear axle can be influenced particularly advantageously. The height dimension chain includes, for example, a ground clearance line, the transverse leaf spring, in particular with force introductions, a rear axle transmission or an electric drive unit, a trunk recess and / or a loading floor or a loading floor height.

[0113] Fig. 19 and Fig. 20 show, in a respective schematic partial sectional view, the wheel suspension 1 according to a respective further embodiment. At least one of the respective fastening elements 6, 7 has at least one respective receiving region 53, 54, in which a respective receiving element 51, 52 of the leaf spring element 3 is received. In the exemplary embodiment, the respective first fastening element has a respective first receiving region 53, in which a respective first receiving element 51 of the leaf spring element 3 is received, whereby the leaf spring element 3 and the respective first fastening element 6 are at least indirectly connected to one another in a form-fitting manner. The respective first receiving element 51 and the respective first receiving region 53 thus form a respective form-fitting connection, which can in particular be referred to as a fourth form-fitting connection 55.Furthermore, in the exemplary embodiment, the respective second fastening element 7 has a respective second receiving region 54 in which a respective second receiving element 52 of the leaf spring element 3 is received, whereby the leaf spring element 3 and the respective second fastening element 7 are at least indirectly connected to one another in a form-fitting manner. Thus, the respective second receiving element 52 and the respective second receiving region 54 form a respective form-fitting connection, which can be referred to in particular as a fifth form-fitting connection 56.

[0114] In the embodiment shown in Fig. 19, the leaf spring element 3 has at least a first leaf spring part 57 and two second leaf spring parts 58 formed separately from the first leaf spring part 57. For example, the leaf spring element 3 has two third leaf spring parts 59 formed separately from the leaf spring parts 57, 58. The respective first receiving element 51 is formed exclusively by the respective second leaf spring part 58, preferably with respect to the first and the respective second leaf spring part 57, 58, and in particular with respect to the respective third leaf spring part 59. The respective second receiving element 52 is formed exclusively by the respective third leaf spring part 59, preferably with respect to the first and the respective third leaf spring part 57, 59, and in particular with respect to the respective second leaf spring part 58.

[0115] As shown in Fig. 19, the leaf spring element 3 has, for example, two further leaf spring parts 60, 61, in particular formed separately from the leaf spring parts 57, 58, 59. The first leaf spring part 57 and the respective second leaf spring part 58 are at least partially, in particular completely, covered upwards in the vehicle vertical direction z by a first of the further leaf spring parts 60. The first leaf spring part 57 and the respective third leaf spring part 59 are at least partially, in particular completely, covered downwards in the vehicle vertical direction Z by the second of the further leaf spring parts 61. The first further leaf spring part 60 can in particular be referred to as the fourth leaf spring part. The second further leaf spring part 61 can in particular be referred to as the fifth leaf spring part.

[0116] As shown in Fig. 19, it is provided, for example, that the respective first receiving element 51 is partially formed by a respective partial region 60a of the first further leaf spring part 60. The respective first receiving element 51 is thus formed by the respective second leaf spring part 58 and the respective partial region 60a. For example, the respective second receiving element 52 is partially formed by a respective partial region 61a of the second further leaf spring part 61. Thus, the respective second receiving element 52 is partially formed by the respective third leaf spring part 52 and by the respective partial region 61a.

[0117] In the embodiment shown in Fig. 19, the leaf spring parts 57, 58, 59 are fiber-reinforced, with fibers of the first leaf spring part 57 running in a first direction 65 and fibers of the respective second leaf spring part 58 running in a second direction 66, which is oblique or perpendicular to the first direction 65. Preferably, the fibers of the respective third leaf spring part 59 run in the second direction 66. The respective further leaf spring part 60, 61 is preferably fiber-reinforced. The fibers of the respective further leaf spring part 60, 61 preferably run in the first direction 65.

[0118] In the embodiment shown in Fig. 20, the leaf spring element 3 has two local material thickenings 63 formed integrally with a base body 62 of the leaf spring element 3, through which the respective first receiving element

[0119] 51 is at least partially formed. The material thickenings 63 can in particular be referred to as first material thickenings 63. In the exemplary embodiment, the leaf spring element 3 has two second local material thickenings 64 formed integrally with the base body 62, through which the respective second receiving element

[0120] 52 is at least partially formed. The respective local material thickening 63, 64 is formed, for example, in particular completely, by matrix material of the leaf spring element 3.

[0121] Equivalent to the embodiment shown in Fig. 19, the embodiment shown in Fig. 20 also provides the respective further leaf spring element 60, 61, each having the respective partial region 60a, 61a. For example, the respective first receiving element 51 is partially formed by the respective partial region 60a. For example, the respective second receiving element 52 is partially formed by the respective partial region 61a.

[0122] List of reference symbols

[0123] Wheel suspension spring link a fastening area b second positive connection leaf spring element first fastening device second fastening device first fastening element second fastening element first contact surface second contact surface 0 first bearing point 1 first bearing device 2 component 3 structure 4 first holding device 5 second holding device 6 first holding part 7 second holding part 8 first contact surface 9 second contact surface 0 second bearing point 1 second bearing device 2 wheel carrier 3 first screw element 4 second screw element 5 spring and / or damper device 6 receiving opening 7 connecting part 7a first positive connection 8 undercut 9 receiving space 0 first stop area 1 second stop area eccentric screw

[0124] curvature

[0125] Radius second radius first slide second slide third slide fourth slide

[0126] Production aids Groove structure first plastic film second plastic film third plastic film fourth plastic film

[0127] recess

[0128] Bearing part third form fit first area second area first receiving element second receiving element first receiving area second receiving area fourth form fit fifth form fit first leaf spring part second leaf spring part third leaf spring part further leaf spring parta sub-area further leaf spring parta sub-area

[0129] Main body first material thickening second material thickening first direction second direction first partial view second partial view

[0130] Top view

[0131] Partial section view

[0132] Cutting reference points

[0133] Vehicle longitudinal direction y Vehicle transverse direction

[0134] Vehicle vertical direction

Claims

Patent claims 1. Wheel suspension (1) for a motor vehicle, • with at least one spring link (2) provided for guiding at least one vehicle wheel, which is designed as a leaf spring element (3), • with at least one fastening device (4) formed separately from the spring link (2), which has at least two fastening elements (6, 7) formed separately from one another, each having a respective contact surface (8, 9) between which the spring link (2) is arranged and is non-positively connected to the fastening device (4) via the contact surfaces (8, 9), which has at least one first bearing point (10) via which the spring link (2) can be coupled in an articulated manner to a body (13) of the motor vehicle, • with at least one holding device (14) formed separately from the spring link (2) and the fastening device (4), which has at least two holding parts (16, 17), each having a respective support surface (18, 19), between which the spring link (2) is arranged and is non-positively connected to the holding device (14) via the support surfaces (18, 19), which has at least one second bearing point (20) via which the spring link (2) can be coupled to the vehicle wheel in an articulated manner, characterized in that • the first fastening element (6) has at least one receiving opening (26) and the second fastening element (7) has at least one connecting part (27) which is different from a screw element and which is arranged in the receiving opening (26) to form a positive connection (27a) between the fastening elements (6, 7), and / or • the holding parts (16, 17) are formed separately from one another and at least the support surface (18, 19) of one of the holding parts (16, 17) is positively connected to the spring link (2) and / or • at least one of the respective fastening elements (6, 7) has at least one respective receiving area (53, 54) in which a respective receiving element (51, 52) of the leaf spring element (3) is received, whereby the leaf spring element (3) and the respective fastening element (6, 7) are positively connected to one another.

2. Wheel suspension (1) according to claim 1, characterized in that the support surfaces (18, 19) at least partially delimit a receiving space (29) designed as an undercut (28), in which a fastening region (2a) of the spring link (2) is arranged for the positive connection of the spring link (2) to at least one of the holding parts (16, 17).

3. Wheel suspension (1) according to claim 2, characterized in that the fastening region (2a) is wedge-shaped.

4. Wheel suspension (1) according to one of the preceding claims, characterized in that at least one of the holding parts (16, 17) has a stop region (30, 31) extending obliquely or perpendicularly to its support surface (18, 19), against which the spring link (2) rests.

5. Wheel suspension (1) according to one of the preceding claims, characterized in that at least one of the contact surfaces (8, 9) has a curvature (33).

6. Wheel suspension (1) according to one of the preceding claims, characterized in that the leaf spring element (3) has at least one first leaf spring part (57) and at least one respective second leaf spring part (58) formed separately from the first leaf spring part (57), wherein the respective receiving element (51) is formed by the respective second leaf spring part (58).

7. Wheel suspension (1) according to claim 6, characterized in that the leaf spring parts (57, 58) are fiber-reinforced, wherein fibers of the first leaf spring part (57) run in a first direction (65) and fibers of the respective second leaf spring part (58) run in a second direction (66) running obliquely or perpendicularly to the first direction (65).

8. Wheel suspension (1) according to one of claims 1 to 5, characterized in that the leaf spring element (3) has at least one local respective material thickening (63) formed integrally with a base body (62) of the leaf spring element (3), by which the respective receiving element (51) is at least partially formed.

9. Wheel suspension (1) according to one of the preceding claims, characterized by at least one foil (36, 37, 38, 39) provided with diamond particles and / or corundum particles and / or silicon carbide particles, which foil is arranged between the spring link (2) and the fastening device (5) or the holding device (14).

10. Wheel suspension (1) according to claim 9, characterized in that the film (36, 37, 38, 39) is pressed with the fastening device (5) or the holding device (14).

11. Wheel suspension (1) according to claim 9 or 10, characterized by at least one plastic film (42, 43, 44, 45) which is different from the film (36, 37, 38, 39) and which is arranged between the spring link (2) and the fastening device (5) or the holding device (14) at least in regions with the film (36, 37, 38, 39) without overlap.

12. Wheel suspension (1) according to claim 11, characterized in that the film (36, 37, 38, 39) extends at least partially in a recess (46) of the plastic film (42, 43, 44, 45).

3. Wheel suspension (1) according to one of the preceding claims, characterized in that at least one bearing device (11) is arranged at the first bearing point (10), via which the spring link (2) can be coupled in an articulated manner to the body (13) of the motor vehicle, wherein • at least one foil provided with diamond particles and / or corundum particles and / or silicon carbide particles is arranged between the bearing device (11) and the fastening device (5) and / or • a bearing part (47) of the bearing device (11) arranged on the fastening device (5) is at least positively connected to the fastening device (5).

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