Sound reduction element, arrangement of a sound reduction element on an electrically powered motor vehicle and method

Abstract

The invention relates to a sound reduction element (10) for a high-voltage line (12a) and / or equipotential bonding line (12b) for an electrically powered motor vehicle, wherein the sound reduction element (10) has sufficient mass to at least partially minimize the transmission of structure-borne noise through the high-voltage line (12a) and / or equipotential bonding line (12b), to enclose the high-voltage line (12a) and / or equipotential bonding line (12b), and to be attached to the high-voltage line (12a) and / or equipotential bonding line (12b) by means of suitable fastening elements (14). Furthermore, the invention relates to an arrangement of at least one sound reduction element (10) for reducing structure-borne noise transmission in an electrically powered motor vehicle, as well as a method for reducing structure-borne noise transmission in an electrically powered motor vehicle.

Description

The invention relates to a sound reduction element according to patent claim 1. Furthermore, the invention relates to an arrangement according to the invention of a sound reduction element on an electrically operable motor vehicle and to a method according to the invention for reducing structure-borne sound transmission in an electrically operable motor vehicle.It is already known in the prior art that in electrically operable motor vehicles or electric vehicles, the electrical energy is transmitted from the high-voltage accumulator to the drive by means of high-voltage lines (HV lines). This is usually done with two separate and parallel lines, one for plus and one for minus. In addition, potential compensation lines (PA lines) connect the drive to chassis components or the vehicle body.The known problem here is that the drive represents an acoustic source in which it is necessary to distinguish between structure-borne sound and airborne sound. To reduce the impact on structure noise, the drive is decoupled from the chassis components or the vehicle body, inter alia, with the aid of rubber bearings. However, the HV and PA lines also form structure-borne noise bridges, which thus contribute to the transmission of the structure-borne noise to the occupants. This transmission of the structure-borne sound into the interior leads to disturbing noises in the vehicle interior and thus impairs the driving comfort.It is the object of the invention to create a possibility which is intended to reduce the structure-borne sound in a vehicle interior of a motor vehicle, which is transmitted by the high-voltage lines and / or potential compensation lines.This object is achieved according to the invention by a sound reduction element having the features of patent claim 1, by an arrangement according to the invention of a sound reduction element on an electrically operable motor vehicle and by a method according to the invention for reducing structure-borne sound transmission in an electrically operable motor vehicle. Advantageous embodiments of the invention are the subject matter of the dependent claims and the description.A first aspect of the invention relates to a sound reduction element for a high-voltage line and / or potential compensation line for an electrically operable motor vehicle, wherein the sound reduction element has sufficient mass which is designed to at least partially minimize the transmission of structure-borne noise through the high-voltage line and / or potential compensation line and to enclose the high-voltage line and / or potential compensation line and to be fastened to the line by means of a suitable fastening element.The sound reduction element is intended to be used in the future as an essential component of electrically operated motor vehicles in order to reduce or minimize the transmission of structure-borne noise through high-voltage lines and / or potential compensation lines. Electrically operable motor vehicles or electric vehicles are often distinguished by a reduced noise generation, for example in the drive train. However, other sound sources, in particular vibrations and structure-borne sound, can project more strongly. The sound reduction element is intended to reduce the undesired sound and, for example, thereby to increase the driving comfort.A component of this sound reduction element that is particularly important for this purpose is the mass. It must be sufficient in such a way that the structure-borne sound is minimized. The mass of the sound reducing member helps absorb vibration and reduce sound transmission. This mass is accordingly used to enclose the sound-transmitting components, namely the high-voltage line and / or potential compensation line. The enclosure is another feature of the sound reduction element. It is designed such that it completely encloses the high-voltage line and / or potential compensation line. This means that the lines now have a physical barrier through the sound reduction element, which restricts the transmission of sound. This enclosure ensures that the sound cannot escape and is effectively retained in the structure of the sound reduction element. If the high-voltage line and / or the potential compensation line are surrounded by the sound reduction element, the vibration energy generated by them is transmitted to the sound reduction element. Due to its mass, the sound reduction element can absorb this vibration energy particularly well. This has the consequence that the oscillations are reduced and the structure-borne sound which is transmitted through the lines is reduced.In order for the sound reduction element to perform its function properly, suitable fastening elements are used. These fastening elements are designed to fasten the sound reduction element securely to the high-voltage line and / or potential compensation line. This ensures that the sound reduction element remains fixed and does not slip off the lines, for example, even under the vibrations and / or loads that can occur during the driving operation.In summary, the sound reduction element serves to minimize the sound transmission of high-voltage lines and / or potential compensation lines in electrically operated motor vehicles. This is achieved by using sufficient mass, enclosing the leads and suitable fasteners. This contributes considerably to improving the driving comfort and to reducing disruptive noises in the vehicle interior.In an advantageous embodiment of the invention, it is provided that the sound reduction element is made of an at least partially elastic material, in particular rubber. This feature offers several decisive advantages. First, the use of an elastic material such as rubber gives natural cushioning properties to the sound reducing member. These make it possible to absorb oscillations and vibrations efficiently and to further minimize the transmission of structure-borne noise. Secondly, elastic materials are extremely flexible and adapt easily, for example, to the shapes and / or contours of the high-voltage line and / or potential compensation line. This achieves effective enclosure and allows for close contact between the sound reducer and the conduits. Third, resilient materials such as rubber are typically highly durable and can withstand the various loads involved in vehicle operation without losing their damping characteristics. Finally, the simple handling and assembly of elastic materials significantly facilitates the use and / or assembly of the sound reduction element. They can easily be placed around the leads and securely attached using suitable fasteners.In another advantageous embodiment of the invention, it is provided that the sound reduction element has at least one guide for a fastening element enclosing the sound reduction element. The guides, in particular grooves, are designed to facilitate the placement and fastening of the sound reduction element on the high-voltage lines and / or potential compensation lines. They provide a predetermined or conductive structure that enables the fastener to be securely attached and fixed around the sound reducing element.In another advantageous embodiment of the invention, it is provided that the sound reduction element is formed from parts enclosing the high-voltage line and / or potential compensation line. This modular structure enables in particular high flexibility and flexibility. The various parts may be made of rubber or similar materials and are arranged to enclose the leads together, for example without leaving gaps or gaps. This enables effective isolation of structure-borne noise. The flexibility of this modular construction enables the sound reduction element to be adapted to different line geometries and requirements.In another advantageous embodiment of the invention, it is provided that the fastening element is configured in the form of a strip, as a result of which the strip-shaped fastening element thus bears flat against the sound reduction element. An example of this that is particularly cost-effective and easy to handle is a cable tie. This addition offers practical advantages, namely a simple, cost-effective and additionally particularly stable and efficient fastening of the sound reduction element to the high-voltage lines and / or potential compensation lines. It can be easily laid and sealed around the sound reducing element.A further second aspect of the invention relates to an arrangement of at least one sound reduction element for reducing the transmission of structure-borne sound on an electrically operable motor vehicle, which has high-voltage lines and / or potential compensation lines for the transmission of electrical energy, wherein the at least one sound reduction element can be arranged with sufficient mass for a minimized transmission of structure-borne sound through the high-voltage lines and / or potential compensation lines, surrounding the high-voltage lines and / or potential compensation lines, along the high-voltage lines and / or potential compensation lines and can be fastened by means of suitable fastening elements. This arrangement provides the possibility of placing and adapting the sound reduction elements as required. This allows for the use of multiple sound reduction elements to further increase sound reduction efficiency or to make adjustments to different vehicle configurations. The use of this arrangement is in particular simple, cost-effective and offers the flexibility of adapting the degree of sound reduction to the respective requirements.In an advantageous embodiment of the invention, it is provided that at least one second sound reduction element is provided directly next to a sound reduction element. It is thus provided that not only individual, but pairs of sound reduction elements are provided, in particular at the end regions of the lines. This arrangement offers additional sound reduction effects and specific control over the transmission of structure-borne noise.A further third aspect of the invention relates to a method for reducing structure-borne sound transmission in an electrically operable motor vehicle, in which high-voltage lines and / or potential compensation lines are used for transmitting electrical energy. The method comprises a plurality of steps, wherein first of all provision is made for at least one sound reduction element with sufficient mass for minimized transmission of structure-borne noise through the high-voltage lines and / or potential compensation lines. Subsequently, an assembly of at least one sound reduction element enclosing the high-voltage lines and / or potential compensation lines is provided along the high-voltage lines and / or potential compensation lines. Subsequently, a fastening of the sound reduction elements to the lines by means of suitable fastening elements is provided. Finally, a connection of the high-voltage lines and / or potential compensation lines is also provided at respective corresponding connections. The method can thus also be used for installing the sound reduction elements and for connecting the lines, wherein the structure-borne sound transmission in electrically operable motor vehicles is reduced in a targeted manner in order thus to restrict disruptive noises in the vehicle interior to a minimum. The order of the steps is changeable.In an advantageous embodiment of the invention, it is provided that a positioning of a plurality of sound reduction elements is carried out along the entire length of the high-voltage lines and / or potential compensation lines. By placing several sound reduction elements along the entire length of the lines, a continuous sound reduction is made possible. This means that structure-borne noise is minimized at various points along the lines. The combination of a plurality of sound reduction elements enhances in particular the effect of sound reduction and can contribute to achieving an even better insulation with respect to structure-borne noise.Finally, in another advantageous embodiment of the invention, it is provided that a first sound reduction element and a second sound reduction element are positioned at respective end regions of the high-voltage lines and / or potential compensation lines. By positioning sound reduction elements at the end regions of the lines, the transmission of structure-borne sound directly at the source is minimized. This can be particularly effective, since in particular the end regions at the connections are potential sound sources.In summary, the object of the invention is achieved in that sound reduction elements or rubber elements are mounted on the lines in order to reduce the transmission of the structure-borne sound by damping, connecting the lines to one another and by their mass.In order to reduce the transmission of structure-borne sound via the lines, rubber elements are fastened to the lines and in the process enclose them. In particular in the case of two separate high-voltage lines, the rubber elements each enclose both lines. The rubber elements on the lines reduce the transmission of the structure-borne sound by their internal damping, the connection of the two lines to one another and their mass. Typically, the rubber elements are significantly shorter than the entire line length. Positioning of the rubber elements along the entire length of the lines is possible and effective. The rubber elements can be fastened inter alia by the use of cable ties.The invention thus proposes a reduction of structure-borne noise via lines.Further features of the invention are evident from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description and 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 respectively specified combination but also in other combinations or alone.The invention will now be explained in more detail on the basis of a preferred exemplary embodiment and with reference to the drawings. It shows: FIG. 1 shows a schematic perspective view of a sound reduction element for a high-voltage line and / or potential compensation line.FIG. 1 shows a perspective view of a sound reduction element 10 for a high-voltage line 12 aand / or potential compensation line 12 bfor an electrically operable motor vehicle, wherein the sound reduction element 10 has a sufficient mass which is designed to at least partially minimize the transmission of structure-borne noise through the high-voltage line 12 aand / or potential compensation line 12 b.The high-voltage line 12 aand / or potential compensation line 12 bis surrounded by the sound reduction element 10 and fastened to the high-voltage line 12 aand / or potential compensation line 12 bby means of a suitable fastening, namely a fastening element 14.The sound reduction element 10 is made of at least partially elastic materials, in particular of a rubber, in order to produce a particularly good absorption of structure-borne noise. In addition, the sound reduction element 10 is designed such that at least one guide 16 for a fastening element 14 surrounding the sound reduction element 10 is arranged. The fastening element 14 is in particular configured in the form of a band. It is also possible here to provide the fastening element 14 as a cable tie or a cable strap, as a result of which particularly good fastening of the sound reduction element 10 to the high-voltage lines 12 aand / or potential compensation lines 12 bis possible.In addition, it is also possible for the sound reduction element 10 to be formed from one or more parts 10 a, 10 b, 10 csurrounding the high-voltage line 12 aand / or potential compensation lines 12 b. This means that the sound reduction element 10 has different parts 10 a, 10 b, 10 c, which enclose the high-voltage lines 12 aand / or potential compensation lines 12 bwith one another and thus enable the sound reduction. In particular, it is also provided that a plurality of sound reduction elements 10 is positioned along the entire length of the high-voltage lines 12 aand / or potential compensation lines 12 b, whereby an improved sound reduction is made possible.The sound reduction element 10 is illustrated here in particular as square, wherein a side 22 bof the sound reduction element 10 pointing towards the vehicle floor 22 ais embodied as particularly flat in order to enable a particularly stable support on the vehicle floor 22 a. Furthermore, it is also possible to provide this side 22 bcorrugated or with a profile in order to provide the smallest possible contact with the vehicle floor 22 a. In particular, however, it is also possible to provide no contact with the vehicle floor 22 ato enable even better sound insulation.FIG. 2 is a perspective view of the high-voltage lines 12 aand / or potential compensation lines 12 bwith the respective sound reduction elements 10, which are positioned as a plurality along the entire length of the high-voltage lines 12 aand / or potential compensation lines 12 b.In this case, in particular an arrangement of the at least one sound reduction element 10 is provided for reducing the transmission of structure-borne sound on the electrically operable motor vehicle, wherein the sound reduction element 10 is arranged on the high-voltage lines 12 aand / or potential compensation lines 12 b. The at least one sound reduction element 10 here likewise has the sufficient mass in order to provide minimized transmission of structure-borne noise through the high-voltage lines 12 aand / or potential compensation lines 12 b, wherein the at least one sound reduction element 10 encloses the high-voltage lines 12 aand / or potential compensation lines 12 band is arranged along the latter and is fastened by means of suitable fastening elements 14, in particular cable ties.It is particularly evident here that a first sound reduction element 10 and a second sound reduction element 11 have been positioned at respective end regions 18, 20 of the high-voltage lines 12 aand / or potential compensation lines 12 bto reduce the sound reduction particularly at the connections which are not illustrated in FIG. 2. In addition, it is thus provided to arrange at least one second sound reduction element 11 directly next to a sound reduction element 10, as a result of which the sound reduction is also possible, in particular also along the entire length of the high-voltage lines 12 aand / or potential compensation lines 12 b.List of reference characters10 Sound reduction element 10 apart 10 bpart 10 cpart 11 Sound reduction element 12 aHigh-voltage line 12 bPotential compensation line 14 Fastening element 16 Guide 18 End region 20 End region 22 aVehicle floor 22 bside

Claims

Sound reduction element (10) for a high-voltage line (12a) and / or potential compensation line (12b) for an electrically operable motor vehicle, wherein the sound reduction element (10) has a sufficient mass which is designed to at least partially minimize the transmission of structure-borne sound through the high-voltage line (12a) and / or potential compensation line (12b) and to enclose the high-voltage line (12a) and / or potential compensation line (12b) and to be fastened to the high-voltage line (12a) and / or potential compensation line (12b) by means of suitable fastening element (14).The sound reduction element (10) according to claim 1, characterized in that the sound reduction element (10) is made of an at least partially elastic material.Sound reduction element (10) according to Claim 1 or 2, characterized in that the sound reduction element (10) has at least one guide (16) for a fastening element (14) enclosing the sound reduction element (10).Sound reduction element (10) according to one of the preceding claims, characterized in that the sound reduction element (10) is formed from parts (10a, 10b, 10c) enclosing the high-voltage line (12a) and / or potential compensation line (12b).Sound reduction element (10) according to one of the preceding claims, characterized in that the fastening element (14) is of strip-shaped design.Arrangement of at least one sound reduction element (10) for reducing structure-borne sound transmission on an electrically operable motor vehicle, which can be arranged on high-voltage lines (12a) and / or potential compensation lines (12b) which are designed for transmitting electrical energy, wherein the at least one sound reduction element (10) is designed with sufficient mass for minimized transmission of structure-borne sound through the high-voltage lines (12a) and / or potential compensation lines (12b), wherein the at least one sound reduction element (10) can be arranged along the high-voltage lines (12a) and / or potential compensation lines (12b) in a manner enclosing the high-voltage lines (12a) and / or potential compensation lines (12b) and can be fastened by means of suitable fastening elements (14).Arrangement according to Claim 6, characterized in that at least one second sound reduction element (11) is provided directly next to a sound reduction element (10).Method for reducing structure-borne sound transmission in an electrically operable motor vehicle, in which high-voltage lines (12a) and / or potential compensation lines (12b) are used for transmitting electrical energy, wherein the method comprises the following steps: - provision of at least one sound reduction element (10) having sufficient mass for minimized transmission of structure-borne sound through the high-voltage lines (12a) and / or potential compensation lines (12b), - mounting of the at least one sound reduction element (10) enclosing the high-voltage lines (12a) and / or potential compensation lines (12b) along the high-voltage lines (12a) and / or potential compensation lines (12b), - fastening of the at least one sound reduction element (10) to the high-voltage lines (12a) and / or potential compensation lines (12b) by means of suitable fastening elements (14), connection of the high-voltage lines (12a) and / or potential compensation lines (12b) to respective corresponding terminals.Method according to Claim 8, characterized in that positioning of a multiplicity of sound reduction elements (10) is carried out along the entire length of the high-voltage lines (12a) and / or potential compensation lines (12b).Method according to claim 8 or 9, characterised in that a first sound reduction element (10) and a second sound reduction element (11) are positioned at respective end regions (18, 20) of the high-voltage lines (12a) and / or potential compensation lines (12b).

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