Damping device and vehicle comprising a damping device

Abstract

Damping device (1) for a motor vehicle, in particular for a rear axle, comprising - an axle carrier (2) with connecting areas (3) and wheel suspension areas (4), wherein the axle carrier can be connected to other components of the vehicle at the connecting areas (3) and wheels of the vehicle can be suspended at the wheel suspension areas (4), - at least one bearing device (5) which is attached to at least one connecting region (3), - wherein the bearing device (5) is configured to dampen a vibration of the axle carrier (2) along a longitudinal axis (100) within a predefined first frequency band, wherein a loss angle of the vibration does not fall below 40° and the loss angle of the vibration does not exceed 70°.

Description

[0001] The present invention relates to a damping device for a motor vehicle. Furthermore, the invention relates to a motor vehicle comprising such a damping device.

[0002] In premium vehicle classes, very high comfort requirements are placed on the noise and / or vibration behavior of the vehicle interior. A particular problem is that combustion engines can sometimes cause the rear axle to vibrate due to rotational irregularities. These vibrations are currently dampened by conventional rear axle bearings and / or vibration absorbers, although satisfactory results have not been achieved.

[0003] For example, an active vibration damper is known from DE 10 2009 050 683 A1 and WO 2005 / 001 308 A1. This damper is specifically controlled to dampen vibrations of the rear axle. However, such a vibration damper is very heavy and requires additional electronics and power for control.

[0004] DE 102 29 757 A1 describes an intermediate mass arranged in elastic support elements. The intermediate mass acts as a vibration damper.

[0005] From DE 10 2011 002 700 A1, an axle drive is attached to a floor plate structure via a series connection of two elastic bearings with a mass body in between.

[0006] DE 10 2004 022 167 A1 describes bearing elements of a rear axle carrier, wherein the bearing elements are assigned an actively controllable actuator which transversely displaces the bearing center point of the respective bearing element.

[0007] The Chassis Manual. 3rd edition: Vieweg Teubner, 2011, pp. 353-356, 465-467, 484-486, 474-477, 481-482; Heißing, Bernd; Ersoy, Metin; Gies, Stefan. Describes the fundamentals of chassis technology. This includes the mounting of an axle carrier on a vehicle using hydraulically damped axle carrier bearings.

[0008] It is clearly disadvantageous to use conventional vibration dampers, as they are expensive to manufacture and heavy. Furthermore, vibration dampers require additional labor during vehicle assembly.

[0009] It is therefore an object of the invention to provide a damping device which enables safe and reliable damping of vibrations with simple and cost-effective production and low-maintenance operation.

[0010] The object is achieved by the features of the independent claim. Thus, the object is achieved by a damping device that can be used for a motor vehicle, wherein the damping device is particularly suitable for damping vibrations on the rear axle of the vehicle. The damping device according to the invention comprises an axle carrier having connecting regions and wheel suspension regions. The axle carrier can be connected to other components of the vehicle at the connecting regions. In particular, the axle carrier can be connected to a chassis and / or a body of the vehicle via the connecting regions. The wheel suspension regions are particularly designed to connect the axle carrier to wheels of the vehicle. Thus, the wheels of the vehicle can advantageously be suspended from the axle carrier.Furthermore, the damping device according to the invention comprises at least one bearing device attached to at least one connection area. Thus, the bearing device advantageously serves to mount the axle carrier on the other components of the vehicle. According to the invention, the bearing device is configured to dampen vibration of the axle carrier along a longitudinal axis of the axle carrier within a predefined frequency band. The drive and movement of the vehicle's wheels, in particular, result in different vibrations that cannot be clearly determined in advance. Therefore, by damping the predefined frequency band, safe and reliable damping of any vibrations that occur is possible. This enables comfortable damping of vibrations that also meets the high comfort requirements of luxury vehicles.The longitudinal axis of the axle carrier is, in particular, identical to a longitudinal axis of the vehicle in which the damping device is installed. The mounting device according to the invention advantageously eliminates the need for additional vibration dampers. Thus, the damping device has a simple and cost-effective design and allows for simple and cost-effective installation of the damping device in the vehicle.

[0011] The subclaims contain advantageous developments of the invention.

[0012] Advantageously, the bearing device is configured to dampen vibration of the axle carrier along the longitudinal axis at a frequency between 10 Hz and 20 Hz. Particularly preferably, the bearing device dampens vibration with a frequency between 12 Hz and 13 Hz. These values ​​are, in particular, maxima at which the greatest possible damping occurs, whereby frequency deviations can also be dampened by the damping device due to the frequency band according to the invention.

[0013] In addition to damping vibrations along the longitudinal axis, the mounting device is advantageously also configured to dampen vibrations along a vertical axis of the axle carrier. The vertical axis is advantageously parallel to the vertical axis of the vehicle. By damping vibrations along the longitudinal and vertical axes, possible comfort for vehicle occupants is further increased. The design of the damping device remains very simple, cost-effective, and lightweight compared to the state of the art.

[0014] In a particularly preferred embodiment, the mounting device is configured to dampen vibrations of the axle support along the vertical axis at a frequency between 35 Hz and 85 Hz. Particularly preferably, frequencies between 45 Hz and 70 Hz can be dampened. Analogous to the previously described damping along the longitudinal axis, the specified range here is also to be understood in particular as the maximum of the damping. Since a vibration to be damped by the damping device is usually not clearly determined in advance, the frequency band allows any deviations that may occur to be damped as well. The frequencies specified as preferred ultimately ensure the greatest possible comfort for the vehicle's occupants.

[0015] The bearing device advantageously comprises an axial or biaxial hydromount. In particular, the design as an axial or biaxial hydromount depends on the vibration directions to be damped. If the bearing device is intended to dampen only vibrations along the longitudinal axis, an axial hydromount is sufficient. If it is advantageously intended that the bearing device dampens vibrations along the longitudinal axis and the vertical axis, a biaxial hydromount is provided in particular. Hydromounts are simple and cost-effective to manufacture. The assembly of an existing axle carrier in a vehicle is not compromised by the use of hydromounts, since hydromounts, like conventional bearings, can be easily and inexpensively integrated into the axle carrier.

[0016] Particularly preferably, the hydraulic mount is a passive hydraulic mount. This advantageously eliminates the need for additional control electronics, making the design of the damping device very simple and robust. This avoids, in particular, sources of error that could lead to failure of the damping device. Furthermore, the use of passive hydraulic mounts enables cost reduction compared to the use of active mounts and / or active vibration absorbers.

[0017] The damping device is designed such that the vibration loss angle does not fall below 40°. In particular, it is provided that the vibration loss angle does not fall below 50°. Particularly advantageously, a vibration loss angle of 60° is not exceeded. Furthermore, it is provided that the vibration loss angle does not exceed 70°, preferably 65°, particularly preferably 60°. Such loss angles ensure sufficient damping of any vibrations that may occur, while simultaneously avoiding a negative impact, particularly on the damping of the wheels themselves.

[0018] In an advantageous embodiment, the first frequency band and / or the second frequency band have a bandwidth of at least 20 Hz, in particular of at least 25 Hz. Such a bandwidth is advantageously sufficient to cover the previously described deviations from the frequencies to be attenuated. Therefore, such a bandwidth enables a high level of comfort for the vehicle's occupants.

[0019] The damping device is particularly configured such that the bearing device comprises at least one elastic component and / or at least one fluid chamber. It is advantageously provided that the fluid within the fluid chamber creates hydraulic damping such that the fluid is moved upon deformation of the elastic component. The fluid is preferably an oil. The elastic component is advantageously an elastomeric plastic.

[0020] Finally, the axle carrier is designed in such a way that it has four connecting areas and / or at least two bearing devices.

[0021] In advantageous embodiments, the axle carrier has two or four bearing devices. This achieves, in particular, symmetrical damping of any vibrations that occur. If two bearing devices are used to ensure sufficient damping of any vibrations that occur, it is particularly provided that two additional conventional bearings are provided to connect the fastening areas of the axle carrier to the other components of the vehicle. If only two bearing devices are provided, it is advantageously provided that the bearing devices are aligned symmetrically to the longitudinal axis.

[0022] The invention further relates to a vehicle comprising a damping device as described above. The damping device is advantageously mounted on a rear axle of the vehicle. The damping device according to the invention allows the vehicle to be manufactured very inexpensively while offering a high level of comfort. Furthermore, the damping device enables a reduction in weight and thus a reduction in the vehicle's fuel consumption. Thus, the cost-effectiveness of the vehicle according to the invention is significantly increased compared to the prior art.

[0023] Further details, features, and advantages of the invention will become apparent from the following description and the figures. They show: Fig. 1 a schematic view of a damping device according to an embodiment of the invention, Fig. 2 a schematic view of a bearing device of the damping device from Fig. 1, Fig. 3 a first schematic sectional view of the storage device from Fig. 2, and Fig. 4 a second schematic sectional view of the storage device from Fig. 2.

[0024] Fig. 1 shows a damping device 1 for a motor vehicle. In particular, the damping device 1 is designed to dampen vibrations that occur on a rear axle of the vehicle. The damping device 1 comprises an axle carrier 2, which has a longitudinal axis 100. The longitudinal axis 100 is in particular identical to a longitudinal axis of the vehicle in which the damping device is provided. Perpendicular to the longitudinal axis 100, the axle carrier 2 has a transverse axis 200. The axle carrier 2 has connecting regions 3 and wheel suspension regions 4. The connecting regions 3 serve to connect the axle carrier 2 to other components of the vehicle, and the wheel suspension regions 4 serve to suspend the vehicle's wheels from the axle carrier 2.

[0025] The connecting regions 3 are designed, in particular, as sleeves into which bearing devices 5 can be inserted. The bearing devices 5 are, in particular, biaxial hydromounts, with which vibrations of the axle carrier 2 along the longitudinal axis 100 and along a vertical axis (not shown) of the axle carrier 2 can be damped. The vertical axis is, in particular, perpendicular to the longitudinal axis 100 and to the transverse axis 200 and is advantageously parallel to a vertical axis of the vehicle.

[0026] The bearing devices 5 are configured such that they dampen vibrations with a frequency band of at least 20 Hz, in particular of at least 25 Hz. Such a frequency band applies in particular both to a vibration along the longitudinal axis 100 and to a vibration along the vertical axis. Maximum damping is achieved for vibrations along the longitudinal axis 100 with a frequency between 10 Hz and 20 Hz, in particular between 12 Hz and 13 Hz. For vibrations along the vertical axis, maximum damping is advantageously achieved at frequencies between 35 Hz and 85 Hz, in particular between 45 Hz and 70 Hz. To dampen the vibrations, the bearing devices 5 are mounted in the connecting regions 3. The structure of the bearing devices 5 is shown in the Fig. 2 to 4 shown.

[0027] Fig. 2 shows the bearing device 5 as shown in Fig. 1 is used. The bearing device 5 comprises a circumferential surface 9, with which the bearing device 5 is inserted into the connection area 3 of the axle carrier 2. In particular, a close fit of the circumferential surface 9 against an inner side of the eyelet-shaped connection area 3 is provided, so that a force transmission is possible at least in the direction of the longitudinal axis 100 and the transverse axis 200. The other components of the vehicle are advantageously connected via a central sleeve 10. The central sleeve 10 is movable relative to the circumferential surface 9, so that vibrations can be absorbed by the bearing device 5. The details of this are in Fig. 3 and Fig. 4 shown.

[0028] Fig. 3 shows a section through the bearing device 5 from Fig. 2 in the direction of the transverse axis 200. Thus, Fig. 3 a damping of vibrations along the longitudinal axis 100 by the bearing device 5.

[0029] The central sleeve 10 is connected to the peripheral surface 9 via an elastic component 6. In this way, a bearing force can be transmitted between the central sleeve 10 and the peripheral surface 9. To dampen any vibrations that occur, a fluid is provided in a first fluid chamber 7, whereby a first fluid movement 11 occurs upon vibrations along the longitudinal axis 100. The first fluid movement 11 therefore dampens vibrations along the longitudinal axis 100.

[0030] Fig. 4 shows a sectional view of the bearing device 5 from Fig. 2 along the longitudinal axis 100 of the axle carrier 2. Thus, in Fig. 4 shows the damping of vibrations along the vertical axis. Fig.4 shows that the central sleeve 10 is connected to the peripheral surface 9 by the elastic component 6. Again, a fluid is present in a second fluid chamber 8, with movement of the central sleeve 10 relative to the peripheral surface 9 resulting in a second fluid movement 12. Such a second fluid movement 12 therefore allows for damping of vibrations along the vertical axis.

[0031] Overall, it is therefore evident that the bearing device 5 enables damping of vibrations along the longitudinal axis 100 through the first fluid movement 11 and damping of vibrations along the vertical axis through the second fluid movement 12. By damping frequencies within the predefined frequency band, a high level of comfort for vehicle occupants can be achieved, since all occurring vibrations are damped by the damping device 1. The design of the damping device 1 and its assembly are very simple, since the bearing devices 5 can be very easily mounted on the axle carrier 2. Furthermore, no additional components, such as additional vibration dampers, are required. List of reference symbols: 1 damping device 2 axle supports 3 Connection area 4 Wheel suspension area 5 Storage device 6 Elastic component 7 First fluid chamber 8 Second fluid chamber 9 Circumferential surface 10 center sleeve 11 First fluid movement 12 Second fluid movement

Claims

[1] Damping device (1) for a motor vehicle, in particular for a rear axle, comprising - an axle carrier (2) with connecting areas (3) and wheel suspension areas (4), wherein the axle carrier can be connected to other components of the vehicle at the connecting areas (3) and wheels of the vehicle can be suspended at the wheel suspension areas (4), - at least one bearing device (5) which is attached to at least one connecting region (3), - wherein the bearing device (5) is configured to dampen a vibration of the axle carrier (2) along a longitudinal axis (100) within a predefined first frequency band, wherein a loss angle of the vibration does not fall below 40° and the loss angle of the vibration does not exceed 70°. [2] Damping device (1) according to claim 1, characterized bythat the bearing device (5) can dampen a vibration of the axle carrier (2) along the longitudinal axis (100) with a frequency between 10 Hz and 20 Hz, in particular between 12 Hz and 13 Hz. [3] Damping device (1) according to one of the preceding claims, characterized by that the bearing device (5) is designed to dampen a vibration of the axle carrier (2) along a vertical axis within a predefined second frequency band. [4] Damping device according to claim 3, characterized by that with the bearing device (5), a vibration of the axle carrier (2) along the vertical axis with a frequency between 35 Hz and 85 Hz, in particular between 45 Hz and 70 Hz, can be damped. [5] Damping device (1) according to one of the preceding claims, characterized by that the bearing device (5) comprises a hydraulic bearing, in particular an axial hydraulic bearing or biaxial hydraulic bearing. [6] Damping device (1) according to claim 5, characterized by that the hydro bearing is a passive hydro bearing. [7] Damping device (1) according to one of the preceding claims, characterized by that a loss angle of the oscillation does not fall below 50°, particularly preferably 60°, and / or the loss angle of the oscillation does not exceed 65°, particularly preferably 60°. [8] Damping device (1) according to one of the preceding claims, characterized by that the first frequency band and / or the second frequency band has a bandwidth of at least 20 Hz, in particular of at least 25 Hz. [9] Damping device (1) according to one of the preceding claims, characterized by that the bearing device (5) comprises at least one elastic component (6) and / or at least one fluid chamber (7, 8). [10] Damping device (1) according to one of the preceding claims, characterized bythat the axle carrier (2) has four connecting areas (3) and / or at least two bearing devices (5). [11] Vehicle comprising a damping device according to one of the preceding claims, wherein the damping device is mounted in particular on a rear axle of the vehicle.

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