Fastener, vehicle, and method of providing a grounding connection in a vehicle

Abstract

A fastener (1) configured to provide a grounding connection in a vehicle (2). The fastener (1) comprises a threaded portion (3) comprising thread-forming threads (4) configured to form threads in a hole (5') of a part (5) of the vehicle (2) upon rotation of the fastener (1) around a main axis (mA) thereof, and a first head portion (6) comprising a first attachment hole (h1). The first attachment hole (h1) is configured to receive a second fastener (11) for attaching a terminal connector (13) to the first head portion (6) of the fastener (1). The centre axis (c1) of the first attachment hole (h1) is arranged at an angle (a1) relative to the main axis (mA) of the fastener (1), and wherein the angle (a1) is within the range of 30 – 150 degrees or is within the range of 70 – 110 degrees. The present disclosure further relates to a vehicle (2) method (100) of providing a grounding connection in a vehicle (2).

Description

[0001] Fastener, Vehicle, and Method of providing a Grounding Connection in a Vehicle

[0002] TECHNICAL FIELD

[0003] The present disclosure relates to a fastener configured to provide a grounding connection in a vehicle. The present disclosure further relates to a vehicle comprising a grounding assembly for providing a grounding connection in the vehicle and a method of providing a grounding connection in a vehicle.

[0004] BACKGROUND

[0005] Vehicles typically comprise an electrical system configured to power various components and systems, such as lighting, infotainment, climate control, and starting mechanisms. These electrical systems usually comprise one or more batteries, which are arranged to store and supply energy for operation of the various components and systems. In commercial vehicles, such as trucks and buses, it is common to use multiple batteries to meet high energy demands.

[0006] To enable proper functioning of powered components and systems, vehicles are generally equipped with grounding connections. Grounding is often achieved by connecting the electrical system to the body-in-white (BiW), which serves as a reference point for electrical potential. The term "body-in-white" (BiW) refers to a body structure of the vehicle in an unfinished state, before the application of paint, coatings, or the assembly of other components such as doors, windows, and electrical systems. Using the BiW as a grounding platform allows the electrical design to be simplified and creating a shared grounding reference.

[0007] A typical method involves ring terminals crimped to grounding cables. These cables are secured to the BiW using cap nuts or screw-nut assemblies, where the BiW is prepared to provide a conductive surface, for example, through welding. Grounding cables are then routed to the components that require grounding.

[0008] Existing approaches are often limited to using specifically designated and prepared holes in the BiW for grounding. This typically requires allocating predefined positions on the BiW for grounding connections, which could restrict flexibility in design. Additionally, the grounding surfaces need to be treated to ensure reliable electrical contact, and this can add to the complexity of the production process. For instance, such treated areas may require additional consideration during painting or other finishing steps to maintain their conductivity. Grounding methods based on current practices may therefore negatively impact vehicle manufacturing processes. The need for specially prepared surfaces on the BiW could make processes such as painting more intricate. These aspects may also influence the layout and arrangement of grounding points in the vehicle design.

[0009] SUMMARY

[0010] It is an object of the present invention to overcome, or at least alleviate, at least some of the above-mentioned problems and drawbacks. The object is achieved by the subject-matter of the appended independent claim(s).

[0011] According to a first aspect of the present disclosure, the object is achieved by a fastener configured to provide a grounding connection in a vehicle. The fastener comprises a threaded portion comprising thread-forming threads configured to form threads in a hole of a part of the vehicle upon rotation of the fastener around a main axis thereof, and a first head portion comprising a first attachment hole. The first attachment hole is configured to receive a second fastener for attaching a terminal connector to the first head portion of the fastener. The centre axis of the first attachment hole is arranged at an angle relative to the main axis of the fastener, and wherein the angle is within the range of 30 - 150 degrees or is within the range of 70 - 110 degrees.

[0012] Since the threaded portion of the fastener comprises thread-forming threads, a fastener is provided capable of ensuring high conductivity between itself and the part of the vehicle, also when the fastener is attached to a hole that has been coated with a material such as paint. In other words, the fastener allows for the part of the vehicle to be coated with a material, such as paint, before the fastener is attached to the hole of the part of the vehicle, which can significantly facilitate the vehicle painting process.

[0013] Furthermore, since the threaded portion of the fastener comprises thread-forming threads, the fastener can establish reliable grounding connections at various parts of the vehicle. This design thus allows grounding connections to be distributed across multiple locations, regardless of whether these parts have undergone coating processes such as painting.

[0014] By enabling grounding connections at diverse points, the fastener provides increased flexibility in vehicle design and assembly. It reduces the need for pre-designated grounding locations, allowing positioning of grounding connections where they are most effective or convenient. This flexibility can also facilitate and shorten the routing of grounding cables, minimising cable lengths and contributing to a more efficient and cost-effective vehicle design.

[0015] In addition, the ability to create grounding connections on coated surfaces eliminates the need for additional steps to remove coatings from specific areas, which can simplify the manufacturing process and reduce production time and costs. These advantages contribute to a more efficient and streamlined assembly process while ensuring high conductivity and reliable electrical grounding throughout a vehicle.

[0016] Furthermore, since the threaded portion of the fastener comprises thread-forming threads, it can be ensured that the fastener is securely retained in a hole after being inserted therein. Accordingly, in this manner, it can be further ensured that the fastener is securely retained in the hole, even when forces are applied to the cable connected to the terminal connector.

[0017] In addition, since the centre axis of the first attachment hole is arranged at an angle within the above specified range relative to the main axis of the fastener, the attachment of a terminal connector to the first head portion of the fastener can be simplified. Moreover, it can be ensured that the fastener is subjected to low torque around the main axis thereof when tightening the second fastener upon attaching the terminal connector to the first head portion.

[0018] Moreover, it can be ensured that the connection between the terminal connector, the second fastener, and the first head portion remains intact, even under conditions where cables are subjected to movement or external forces. By maintaining the integrity of this connection over time, the durability and reliability of the grounding connection can be further enhanced.

[0019] Furthermore, the simplified attachment process enabled by the angle within the above specified range between the centre axis of the first attachment hole and the main axis of the fastener can streamline assembly procedures, which can reduce time and costs during vehicle manufacturing.

[0020] Accordingly, fastener is provided overcoming, or at least alleviating, at least some of the above-mentioned problems and drawbacks. As a result, the above-mentioned object is achieved.

[0021] Optionally, the first attachment hole is a through hole. Thereby, a fastener is provided that allows a user to select between two openings for inserting a second fastener when attaching a terminal connector to the first head portion of the fastener, offering greater flexibility during installation. This design also reduces the need for further turning of the fastener to suit a specific mounting orientation of the terminal connector, simplifying the assembly process and saving time. Moreover, as a further result, it can be ensured that the fastener is securely retained in the hole after installation, i.e. , that the fastener is sufficiently tightened, while also ensuring that excessively high pretention is avoided between the fastener and the hole.

[0022] Optionally, the first head portion comprises a second attachment hole configured to receive a second fastener for attaching a terminal connector to the first head portion, wherein the centre axis of the second attachment hole is arranged at an angle relative to the main axis of the fastener, the angle being within the range of 30 - 150 degrees, or within the range of 70 - 110 degrees, and wherein the angle between the centre axes of the first and second attachment hole is within the range of 70 - 110 degrees. Thereby, a fastener is provided that allows a user to select between at least two different openings for inserting a second fastener when attaching a terminal connector to the first head portion of the fastener, offering greater flexibility during installation. This design also reduces the need for further turning of the fastener to suit a specific mounting orientation of the terminal connector, simplifying the assembly process and saving time. As a further result, it can be ensured that the fastener is securely retained in the hole after installation, i.e., that the fastener is sufficiently tightened, while also ensuring that excessively high pretention is avoided between the fastener and the hole.

[0023] Moreover, since the centre axis of the second attachment hole is arranged at an angle within the above specified range relative to the main axis of the fastener, the attachment of a terminal connector to the first head portion of the fastener can be simplified. Moreover, it can be ensured that the fastener is subjected to low torque around the main axis thereof when tightening the second fastener upon attaching the terminal connector to the first head portion. In addition, it can be ensured that the connection between the terminal connector, the second fastener, and the first head portion remains intact, even under conditions where cables are subjected to movement or external forces. By maintaining the integrity of this connection over time, the durability and reliability of the grounding connection can be further enhanced. Moreover, the simplified attachment process enabled by the angle within the above specified range between the centre axis of the second attachment hole and the main axis of the fastener can streamline assembly procedures, which can reduce time and costs during vehicle manufacturing.

[0024] Optionally, the second attachment hole is a through hole. Thereby, a fastener is provided that allows a user to select between at least three different openings for inserting a second fastener when attaching a terminal connector to the first head portion of the fastener, offering greater flexibility during installation. This design also reduces the need for further turning of the fastener to suit a specific mounting orientation of the terminal connector, simplifying the assembly process and saving time. As a further result, it can be ensured that the fastener is securely retained in the hole after installation, i.e. , that the fastener is sufficiently tightened, while also ensuring that excessively high pretention is avoided between the fastener and the hole.

[0025] Optionally, the first head portion has a cuboidal shape. Thereby, the fastener provides a stable and robust interface for attaching a terminal connector. The cuboidal shape can also facilitate easier alignment of the terminal connector during installation since the cuboidal shape implies that the first head portion has at least substantially flat surfaces that can facilitate positioning of the terminal connector during installation.

[0026] Optionally, the fastener comprises a second head portion configured to engage a tool for rotating the fastener, and wherein the second head portion is arranged between the first head portion and the threaded portion of the fastener. Thereby, the fastener allows for efficient rotation and secure attachment in the hole without risking damage to the first head portion. Moreover, since the second head portion is arranged between the first head portion and the threaded portion of the fastener, it can be ensured that the first head portion is easily accessible for attaching the terminal connector after the fastener has been mounted.

[0027] Optionally, the second head portion has a hexagonal shape. Thereby, the fastener can be engaged with standard tools such as wrenches or sockets. Moreover, the hexagonal shape of the second head portion allows for six different possible wrench insertion directions, which can simplify the installation process, particularly in tight or confined spaces. Additionally, the hexagonal shape can provide a secure grip for the tool, minimising the risk of slippage during rotation and enhancing the efficiency of the assembly process.

[0028] Optionally, the first head portion is located at a distal end of the fastener. Thereby, it can be ensured that the first head portion remains fully accessible after the fastener has been mounted, facilitating the attachment of the terminal connector without interference from other parts of the fastener.

[0029] According to a second aspect of the present disclosure, the object is achieved by a vehicle comprising a grounding assembly for providing a grounding connection in the vehicle, wherein the grounding assembly comprises a fastener according to some embodiments of the first aspect of the present disclosure.

[0030] Since the grounding assembly of the vehicle comprises a fastener according to some embodiments of the first aspect of the present disclosure, a vehicle is provided allowing grounding connections to be established on coated surfaces, such as those covered with paint. Thus, a vehicle is provided having conditions for a simplified painting process during manufacturing. Moreover, due to these features, the need for additional steps to remove coatings prior to grounding is eliminated, or at least reduced, which can streamline the production process of the vehicle.

[0031] Furthermore, a vehicle is provided having increased flexibility in the placement of grounding connections, since the fastener allows such connections to be positioned where they are most effective. This flexibility supports more efficient routing of grounding cables, which can shorten cable lengths and contribute to a more cost-effective design of the vehicle.

[0032] In addition, a vehicle is provided having conditions for reliable grounding connections that maintain high conductivity over time, even when cables are exposed to external forces or movements. This can thus ensure durability and consistent performance of the grounding assembly throughout the operational life of the vehicle.

[0033] Moreover, the simplified attachment process for terminal connectors within the grounding assembly allows for smoother assembly procedures during vehicle production, which potentially also can reduce manufacturing and assembling costs of the vehicle.

[0034] Accordingly, vehicle is provided overcoming, or at least alleviating, at least some of the above-mentioned problems and drawbacks. As a result, the above-mentioned object is achieved.

[0035] Optionally, the part of the vehicle is formed as a weld nut, and wherein the part is welded to a section of the vehicle. Thereby, a high electrical conductivity between the fastener and the part of the vehicle can be ensured even when installing the fastener at thinner sections of the vehicle. Moreover, a durable and reliable attachment of the fastener to the vehicle can be ensured even when installing the fastener to thinner sections of the vehicle. That is, by welding the part of the vehicle to a relatively thin section of the vehicle, a sufficiently deep hole of the part of the vehicle can ensure a high electrical conductivity between the fastener and the part, as well as a durable and reliable attachment of the fastener to the part. Furthermore, the welding of the part to the section of the vehicle can ensure a high electrical conductivity between the part and the section of the vehicle, as well as a durable and reliable attachment of the part to the section of the vehicle.

[0036] Optionally, the fastener attaches a further component to the vehicle. Thereby, a vehicle is provided having conditions for being manufactured and assembled in an even more costefficient manner. This is because the total number of fasteners in the vehicle can be reduced, because the fastener fulfils two purposes, namely to provide a strong and efficient grounding connection and to attach the further component of the vehicle.

[0037] According to some embodiments, the further component comprises a conductive mounting portion, wherein the fastener attaches the conductive mounting portion to the vehicle. In this manner, the need for grounding cables within the vehicle is reduced, which can contribute to a more efficient and cost-effective vehicle design. Furthermore, conditions are provided for utilizing the available space within the vehicle in a more efficient manner, allowing for the integration of additional features or systems within limited spatial constraints. Additionally, this can enhance serviceability by reducing the complexity of wiring and connections, making maintenance and repairs simpler and more cost-efficient.

[0038] According to a third aspect of the present disclosure, the object is achieved by a method of providing a grounding connection in a vehicle using a fastener according to some embodiments of the first aspect of the present disclosure. The method comprises the steps of:

[0039] - providing a hole in a part of the vehicle,

[0040] - forming threads in the hole by rotating the fastener around the main axis thereof with the threaded portion inserted in the hole, and then

[0041] - attaching a terminal connector to the first head portion by clamping the terminal connector against the first head portion with a second fastener inserted into the first attachment hole of the first head portion.

[0042] Since the threaded portion of the fastener comprises thread-forming threads, a method is provided capable of ensuring high conductivity between the fastener and the part of the vehicle, also when the fastener is attached to a hole that has been coated with a material such as paint. In other words, the method allows for the part of the vehicle to be coated with a material, such as paint, before forming threads in the hole by rotating the fastener around the main axis thereof with the threaded portion inserted in the hole, which can significantly facilitate the vehicle painting process. Furthermore, since the threaded portion of the fastener comprises thread-forming threads, reliable grounding connections can be established at various parts of the vehicle. Thus, the method allows grounding connections to be distributed across multiple locations, regardless of whether these parts have undergone coating processes such as painting.

[0043] By enabling grounding connections at diverse points, the method provides increased flexibility in vehicle design and assembly. In other words, the method reduces the need for pre-designated grounding locations, allowing positioning of grounding connections where they are most effective or convenient. This flexibility can also facilitate and shorten the routing of grounding cables, minimising cable lengths and contributing to a more efficient and cost-effective vehicle design.

[0044] In addition, the ability to create grounding connections on coated surfaces eliminates the need for additional steps to remove coatings from specific areas, which can simplify the manufacturing process and reduce production time and costs. These advantages contribute to a more efficient and streamlined assembly process while ensuring high conductivity and reliable electrical grounding throughout a vehicle.

[0045] Furthermore, by using a fastener according to some embodiments of the first aspect of the present disclosure, it can be ensured that the fastener is securely retained in a hole after being inserted therein. Accordingly, in this manner, it can be further ensured that the fastener is securely retained in the hole, even when forces are applied to the cable connected to the terminal connector.

[0046] In addition, since the centre axis of the first attachment hole is arranged at an angle within the above specified range relative to the main axis of the fastener, the attachment of a terminal connector to the first head portion of the fastener can be simplified. Moreover, it can be ensured that the fastener is subjected to low torque around the main axis thereof when tightening the second fastener upon attaching the terminal connector to the first head portion.

[0047] In addition, it can be ensured that the connection between the terminal connector, the second fastener, and the first head portion remains intact, even under conditions where cables are subjected to movement or external forces. By maintaining the integrity of this connection over time, the durability and reliability of the grounding connection can be further enhanced. Furthermore, the simplified attachment process enabled by the angle within the above specified range between the centre axis of the first attachment hole and the main axis of the fastener can streamline assembly procedures, which can reduce and costs during vehicle manufacturing.

[0048] Accordingly, method is provided overcoming, or at least alleviating, at least some of the above-mentioned problems and drawbacks. As a result, the above-mentioned object is achieved.

[0049] Optionally, the step of providing the hole in the part of the vehicle is performed prior to applying a coating, such as paint, onto the part of the vehicle. Thereby, the process of applying a coating, such as paint, onto the part of the vehicle can be simplified and made more more-cost efficient. This is because the features of the method according to embodiments herein circumvents the need for covering the hole in the part of the vehicle prior to applying the coating.

[0050] Optionally, the step of forming the threads in the hole is performed after applying a coating, such as paint, onto the part of the vehicle. Thereby, since the features of the method according to embodiments herein circumvents the need for removing coating, such as paint, in the hole prior to performing the step of forming the threads in the hole, conditions are provided for a streamlined assembly procedure of the vehicle, potentially reducing time and costs during manufacturing of the vehicle, while ensuring a rigid attachment of the fastener and ensuring high conductivity between the fastener and the part of the vehicle.

[0051] The steps of the method according to embodiments herein may be performed by a human, such as an assembler. Alternatively, one or more of the steps may be performed by a machine, such as an assembly machine.

[0052] Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following detailed description.

[0053] BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Various aspects of the present disclosure, including its particular features and advantages, will be readily understood from the example embodiments discussed in the following detailed description and the accompanying drawings, in which:

[0055] Fig. 1 schematically illustrates a vehicle according to some embodiments, Fig. 2 illustrates a perspective view of a grounding assembly of the vehicle illustrated in Fig. 1,

[0056] Fig. 3 illustrates an exploded view of components of the grounding assembly illustrated in

[0057] Fig. 2,

[0058] Fig. 4 illustrates a side view of the grounding assembly illustrated in Fig. 2 and 3, wherein the grounding assembly is in an assembled state,

[0059] Fig. 5 illustrates a perspective view of the fastener of the grounding assembly according to the embodiments illustrated in Fig. 2 - Fig. 4,

[0060] Fig. 6a illustrates a first side view of the fastener illustrated in Fig. 5,

[0061] Fig. 6b illustrates a second side view of the fastener illustrated in Fig. 5, and

[0062] Fig. 7 schematically illustrates a method of providing a grounding connection in a vehicle using a fastener.

[0063] DETAILED DESCRIPTION

[0064] Aspects of the present disclosure will now be described more fully. Like reference signs refer to like elements throughout. Well-known functions or constructions will not necessarily be described in detail for brevity and / or clarity.

[0065] Fig. 1 schematically illustrates a vehicle 2 according to some embodiments. According to the illustrated embodiments, the vehicle 2 is a truck, i.e. , a type of heavy wheeled vehicle, as well as a type of heavy commercial vehicle. According to further embodiments, the vehicle 2, as referred to herein, may be another type of heavy or lighter type of manned or unmanned vehicle for land- or water-based propulsion such as a lorry, a construction vehicle, a tractor, a bus, a car, a dumper, a ship, a boat, or the like.

[0066] The vehicle 2 may comprise a propulsion system configured to provide motive power to the vehicle 2 via wheels 27, 27’ of the vehicle 2. The propulsion system may comprise an electric propulsion machine and / or an internal combustion engine for providing motive power to the vehicle 2.

[0067] In Fig. 1 , the vehicle 2 is illustrated as positioned in an intended use position on a flat horizontal surface supporting the vehicle 2. As seen in Fig. 1, the wheels 27, 27’ of the vehicle 2 abut against the flat horizontal surface when the vehicle 2 is positioned in the intended use position thereon.

[0068] The vehicle 2 comprises an occupant compartment 55 configured to accommodate a number of vehicle occupants, such as a driver and / or one or more passengers of the vehicle 2. According to the illustrated embodiments, the vehicle 2 comprises a cab 45 accommodating the occupant compartment 55. The cab 45 may also be referred to as a cabin. The occupant compartment 55 comprises a driver seat and possibly one or more passenger seats.

[0069] As mentioned, according to the illustrated embodiments, the vehicle 2 is a truck. The vehicle 2 comprises a chassis 40. According to the illustrated embodiments, the chassis 40 comprises two elongated frame beams each comprising a direction of elongation substantially parallel to a longitudinal direction of the vehicle. The chassis 40 may comprise a number of further arrangements than the two elongated frame beams, such as a number of subframes attached to the two elongated frame beams, as well as cross members connecting the two elongated frame beams. According to the illustrated embodiments, the cab 45 is resiliently suspended relative to the chassis 40 via a suspension arrangement to allow some relative movement between cab 45 and the chassis 40.

[0070] As schematically depicted in Fig. 1, the vehicle 2 comprises electrical system 50. The electrical system 50 may be configured to power various systems and components of the vehicle 2, such as lighting, infotainment systems, climate control units, electronic control modules, power windows, central locking mechanisms, seat adjustment motors, exterior equipment, sensors, wiper motors, auxiliary power outlets for portable electronic devices, and the like.

[0071] The electrical system 50 may further comprise a number of batteries, and / or an onboard electric generator, configured to supply electricity to these systems and components of the vehicle 2. The electrical system 50 may also be referred to as an electric vehicle system. According to embodiments herein, the electrical system 50 has a nominal voltage within the so-called Voltage Class A, usually abbreviated VGA, with a nominal voltage below 60 volts.

[0072] The vehicle 2 comprises a grounding assembly 10 for providing a grounding connection for the electrical system 50 in the vehicle 2.

[0073] Fig. 2 illustrates a perspective view of the grounding assembly 10 of the vehicle 2 illustrated in Fig. 1. Furthermore, Fig. 2 illustrates a section 7 of the vehicle 2 as well as a further component 20 of the vehicle 2 illustrated in Fig. 1.

[0074] As is further explained herein, the section 7 of the vehicle 2 may be a section of the chassis 40 of the vehicle 2. According to the illustrated embodiments, the grounding assembly 10 comprises a fastener 1 , a second fastener 11 , and a terminal connector 13. The fastener 1 as referred to herein may also be referred to as a first fastener. The terminal connector 13 is attached to the fastener 1 by the second fastener 11 , and wherein the fastener 1 is attached to the section 7 of the vehicle 2. Moreover, according to the embodiments illustrated in Fig. 2, the fastener 1 also attaches the further component 20 to the section 7 of the vehicle 2. These aspects will be explained in more detail below.

[0075] The terminal connector 13 is connected to a grounding cable 30 which is connected to the electrical system 50 of the vehicle 2 illustrated in Fig. 1 so as to provide a grounding connection for the electrical system 50.

[0076] Fig. 3 illustrates an exploded view of the components of the grounding assembly 10 illustrated in Fig. 2. Moreover, Fig. 3 illustrates the section 7 of the vehicle 2 as well as the further component 20 of the vehicle 2.

[0077] The fastener 1 comprises a threaded portion 3 comprising thread-forming threads 4 configured to form threads in a hole 5’ of a part 5 of the vehicle 2 upon rotation of the fastener 1 around a main axis thereof.

[0078] According to the embodiments illustrated in Fig. 3, the part 5 of the vehicle 2 is formed as a weld nut comprising a hole 5’. The hole 5’ comprises an at least substantially smooth inner surface without threads. According to the illustrated embodiments, the hole 5’ is a cylindrical through hole. Moreover, the hole 5’ has an inner diameter slightly larger than an outer diameter of a body of the threaded portion 3 of the fastener 1. This may be interpreted as meaning that the inner diameter of the hole 5’ is a few tenths of a percent up to a couple of percents larger than an outer diameter of the body of the threaded portion 3 of the fastener 1. The term "body" of the fastener 1 refers to the cylindrical portion of the threaded portion 3 that does not include the thread-forming threads 4.

[0079] As referred to therein, the part 5 of the vehicle 2, i.e. , the weld nut according to embodiments herein, is also part of the grounding assembly 10. As is further explained herein, the part 5 is configured to be welded to the section 7 of the vehicle 2. After the step of welding, the part 5 is obviously also part of the vehicle 2.

[0080] As can be seen in Fig. 3, according to the illustrated embodiments, the section 7 of the vehicle 2 comprises a through hole 7’. The through hole 7’ of the section 7 of the vehicle 2 comprises an at least substantially smooth inner surface without threads and is cylindrical in shape. According to the illustrated embodiments, the through hole 7’ of the section 7 of the vehicle 2 has an inner diameter slightly larger than the inner diameter of the hole 5’ of the part 5. According to further embodiments, the through hole 7’ of the section 7 of the vehicle 2 may have the same inner diameter as the hole 5’ of the part 5.

[0081] The part 5 of the vehicle 2 is configured to be welded to the section 7 of the vehicle 2 such that a centre axis of the hole 5’ of the part 5 coincides with a centre axis of the through hole 7’ of the section 7 of the vehicle 2.

[0082] In the exploded view of the components of the grounding assembly 10 illustrated in Fig. 2, the grounding assembly 10 can be said to be in an unassembled state.

[0083] Fig. 4 illustrates a side view of the grounding assembly 10 illustrated in Fig. 2 and Fig. 3, wherein the grounding assembly 10 is in an assembled state. Moreover, Fig. 4 illustrates the section 7 of the vehicle 2 as well as the further component 20 of the vehicle 2.

[0084] Below, simultaneous reference is made to Fig. 1 - Fig. 4, if not indicated otherwise. In Fig. 4, the part 5 has been welded to the section 7 of the vehicle 2 such that the centre axis of the hole 5’ of the part 5 coincides with the centre axis of the through hole 7’ of the section 7 of the vehicle 2. Moreover, threads have been provided in the hole 5’ of the part 5 by rotating the fastener 1 around a main axis mA thereof with the threaded portion 3 inserted in the hole 5’. When assembled, as depicted in Fig. 4, the main axis mA of the fastener 1 coincides with the centre axis of the hole 5’ of the part 5.

[0085] Fig. 5 illustrates a perspective view of the fastener 1 of the grounding assembly 10 according to the embodiments illustrated in Fig. 2 - Fig. 4. Below, simultaneous reference is made to Fig. 1 - Fig. 5, if not indicated otherwise.

[0086] As mentioned, the fastener 1 comprises the threaded portion 3 comprising thread-forming threads 4 configured to form threads in a hole 5’ of a part 5 of the vehicle 2 upon rotation of the fastener 1 around a main axis mA thereof. The threaded portion 3 is cylindrical. Moreover, according to the illustrated embodiments, the threaded portion 3 of the fastener 1 is elongated with a direction of elongation coinciding with the main axis mA of the fastener 1. The main axis mA of the fastener 1 refers to the central longitudinal axis that extends through the length of the fastener 1. The main axis mA may represent the geometric centreline of the fastener 1 around which the fastener 1 is at least substantially symmetrically designed and is configured to rotate during installation according to the above. At least the threaded portion 3 of the fastener 1 may be formed by a hardened material, such as a tempered steel alloy, to ensure durability and resistance to wear during thread-forming operations. The hardened material can provide the necessary strength for the threaded portion 3 to reliably cut threads into the inner surface of the hole 5’, even when the part 5 of the vehicle 2 is made of relatively hard materials, such as steel. According to some embodiments, at least the threaded portion 3 of the fastener 1 may be provided with a zincnickel coating, or another type of electrically conductive surface coating.

[0087] The fastener 1 comprises a first head portion 6 and a second head portion 16. The second head portion 16 configured to engage a tool, such as a wrench, for rotating the fastener 1. First head portion 6 comprises a first attachment hole hi. The first attachment hole hi is configured to receive a second fastener 11 for attaching the terminal connector 13 to the first head portion 6 of the fastener 1.

[0088] According to the illustrated embodiments, the centre axis c1 of the first attachment hole hi is arranged at an angle a1 of 90 degrees relative to the main axis mA of the fastener 1. According to further embodiments, the first attachment hole hi may be arranged such that the angle a1 between the centre axis c1 of the first attachment hole hi and the main axis mA of the fastener 1 is within the range of 30 - 150 degrees or is within the range of 70 - 110 degrees.

[0089] Fig. 6a illustrates a first side view of the fastener 1 illustrated in Fig. 5. In Fig. 6a, the fastener 1 is illustrated such that the centre axis c1 of the first attachment hole hi coincides with the viewing direction of Fig. 6a. Moreover, in Fig. 6a, the main axis mA of the fastener 1 is indicated. In Fig. 6a, the fastener 1 is illustrated such that the main axis mA is perpendicular to the viewing direction of Fig. 6a.

[0090] According to the illustrated embodiments, the first attachment hole hi is a through hole. In this manner, a user can select between two different mounting orientations when inserting a second faster 11 into the first attachment hole hi. Moreover, according to the illustrated embodiments, the first attachment hole hi is threaded. In other words, the inner delimiting surfaces of the first attachment hole hi comprises threads according to the illustrated embodiments.

[0091] As can be seen in Fig. 2 - Fig. 4, according to the illustrated embodiments, the second fastener 11 is a bolt comprising threads. Since the first attachment hole hi also comprises threads, the need for a second member, such as a nut, is eliminated when attaching a terminal connector 13 to the first head portion 6 of the fastener 1 via the first attachment hole hi . As can be seen when comparing Fig. 3 and Fig. 4, according to the illustrated embodiments, the terminal connector 13 comprises a through hole 13’, wherein the second fastener 11 is configured to be inserted such that the threaded portion 3 protrudes through the through hole 13’ when attaching the second fastener 11 to the first head portion 6 of the fastener 1.

[0092] Furthermore, as can be seen in Fig. 5, according to the illustrated embodiments, the first head portion 6 comprises a second attachment hole h2. The second attachment hole h2 is also configured to receive a second fastener 11 for attaching a terminal connector 13 to the first head portion 6. According to the illustrated embodiments, the centre axis c2 of the second attachment hole h2 is arranged at an angle a2 of 90 degrees relative to the main axis mA of the fastener 1. However, according to further embodiments, the second attachment hole h2 may be arranged such that the angle a2 between the centre axis c2 of the second attachment hole h2 and the main axis mA of the fastener 1 is within the range of 30 - 150 degrees, or within the range of 70 - 110 degrees.

[0093] Moreover, as indicated in Fig. 5, according to the illustrated embodiments, the angle a3 between the centre axes c1 , c2 of the first and second attachment hole hi, h2 is 90 degrees. However, according to further embodiments, the angle a3 between the centre axes c1 , c2 of the first and second attachment hole hi, h2 may be within the range of 70 - 110 degrees, or may be within the range of 80 - 100 degrees.

[0094] Fig. 6b illustrates a second side view of the fastener 1 illustrated in Fig. 5. In Fig. 6b, the fastener 1 is illustrated such that the centre axis c2 of the second attachment hole h2 coincides with the viewing direction of Fig. 6b. Moreover, in Fig. 6b, the main axis mA of the fastener 1 is indicated. In Fig. 6b, the fastener 1 is illustrated such that the main axis mA is perpendicular to the viewing direction of Fig. 6b.

[0095] According to the illustrated embodiments, the second attachment hole h2 is a through hole. Accordingly, in this manner, a user can select between four different mounting orientations when attaching a second fastener 11 to the first head portion 6 of the fastener 1. Moreover, according to the illustrated embodiments, the second attachment hole h2 is threaded. In this manner, the need for a second member, such as a nut, is eliminated when attaching a terminal connector 13 to the first head portion 6 of the fastener 1 via the second attachment hole h2. According to the illustrated embodiments, the first head portion 6 has a cuboidal shape. In other words, according to the illustrated embodiments, the first head potion 6 comprises four equally sized flat surfaces, each comprising an opening formed by one of the first and second attachment holes hi , h2. However, according to further embodiments, the first head portion 6 may be configured differently.

[0096] As mentioned, the second head portion 16 of the fastener 1 is configured to engage a tool for rotating the fastener 1 upon installation. According to the illustrated embodiments, the second head portion 16 is arranged between the first head portion 6 and the threaded portion 3 of the fastener 1. Moreover, the first head portion 6 is located at a distal end 1” of the fastener 1. The distal end 1”, at which the first head portion 6 is located, may also be referred to as second distal end, wherein the fastener 1 comprises a first distal end T located at an end portion of the threaded portion 3 of the fastener 1.

[0097] As can be seen in Fig. 2 - Fig. 6b, according to the illustrated embodiments, the second head portion 16 has a hexagonal shape. In other words, according to the illustrated embodiments, the second head portion 16 comprises six equally sized flat surfaces, which allows the second head portion 16 to be gripped by a tool, such as by a wrench, from six different insertion directions.

[0098] Fig. 7 schematically illustrates a method of providing a grounding connection in a vehicle using a fastener. The vehicle may be a vehicle 2 according to the embodiments illustrated in Fig. 1 and the fastener may be a fastener 1 according to the embodiments illustrated in Fig. 2 - Fig. 6b. Therefore, below, simultaneous reference is made to Fig. 1 - Fig. 7, if not indicated otherwise.

[0099] The method 100 is a method of providing a grounding connection in a vehicle 2 using a fastener 1, wherein the fastener 1 comprises a threaded portion 3 comprising thread-forming threads 4 configured to form threads in a hole 5’ of a part 5 of the vehicle 2 upon rotation of the fastener 1 around a main axis mA thereof, The fastener 1 further comprises a first head portion 6 comprising a first attachment hole hi, wherein the first attachment hole hi is configured to receive a second fastener 11 for attaching a terminal connector 13 to the first head portion 6 of the fastener 1. The centre axis c1 of the first attachment hole hi is arranged at an angle a1 relative to the main axis mA of the fastener 1, and wherein the angle a1 is within the range of 30 - 150 degrees or is within the range of 70 - 110 degrees. The method 100 comprises the steps of:

[0100] - providing 110 a hole 5’ in a part 5 of the vehicle 2, - forming 120 threads in the hole 5’ by rotating the fastener 1 around the main axis mA thereof with the threaded portion 3 inserted in the hole 5’, and then

[0101] - attaching 130 a terminal connector 13 to the first head portion 6 by clamping the terminal connector 13 against the first head portion 6 with a second fastener 11 inserted into the first attachment hole hi of the first head portion 6.

[0102] According to embodiments herein, the steps 110, 120, and 130 of the method 100 is provided in the above specified order. Moreover, the steps 110, 120, and 130 of the method 100 may be performed by a human, such as an assembler. Alternatively, one or more of the steps 110, 120, and 130 of the method 100 may be performed by a machine, such as an assembly machine.

[0103] The step of forming 120 threads in the hole 5’ by rotating the fastener 1 around the main axis mA thereof also attaches the fastener 1 to the hole 5’ of the part 5. Therefore, this step may also be referred to as a step of attaching the fastener 1 to the hole 5’ of the part 5, while also forming 120 threads in the hole 5’, by rotating the fastener 1 around the main axis mA with the threaded portion 3 inserted in the hole 5’.

[0104] According to the illustrated embodiments, the part 5 of the vehicle 2 as formed as a weld nut welded to a section 7 of the vehicle 2. In other words, in these embodiments, the method 100 may comprise the step of:

[0105] - welding the part 5 to a section 7 of the vehicle 2.

[0106] The step of welding the part 5 to a section 7 of the vehicle 2 may be performed prior to applying a coating, such as paint, onto the section 7 of the vehicle 2. Moreover, the step of welding the part 5 to a section 7 of the vehicle 2 may be performed after providing the hole 5’ in the part 5.

[0107] According to some embodiments, the step of providing 110 the hole 5’ in the part 5 of the vehicle 2 may be performed prior to applying a coating, such as paint, onto the part 5 of the vehicle 2. In other words, according to some embodiments herein, inner delimiting surfaces of the hole 5’ of the part 5 of the vehicle 2 may comprise a coating, such as paint, when inserting the threaded portion 3 of the fastener 1 into the hole 5’ of the part 5 and rotating the fastener 1 around the main axis mA thereof. Accordingly, the step of forming 120 the threads in the hole 5’ may be performed after applying a coating, such as paint, onto the part 5 of the vehicle 2. Since the threaded portion 3 of the fastener 1 comprises thread-forming threads 4, a fastener 1 is provided capable of ensuring high conductivity between itself and the part 5 of the vehicle 2, also when the fastener 1 is attached to a hole 5’ that has been coated with a material such as paint. In other words, the fastener 1 allows for the part 5 of the vehicle 2 to be coated with a material, such as paint, before the fastener 1 is attached to the hole 5’ of the part 5 of the vehicle 2, which can significantly facilitate the painting process of the vehicle 2.

[0108] Furthermore, since the threaded portion 3 of the fastener 1 comprises thread-forming threads 4, the fastener 1 can establish reliable grounding connections at various parts of the vehicle 2. This design thus allows grounding connections to be distributed across multiple locations of the vehicle 2, regardless of whether these parts have undergone coating processes such as painting. Thus, the vehicle 2 depicted in Fig. 1 may comprise a number of fasteners 1 according to embodiments of the present disclosure, wherein each fastener 1 provides a grounding connection in the vehicle 2.

[0109] By enabling grounding connections at diverse points, the fastener 1 according to embodiments herein provides increased flexibility in the design and the assembly of the vehicle 2. It reduces the need for pre-designated grounding locations, allowing positioning of grounding connections where they are most effective or convenient. This flexibility can also facilitate and shorten the routing of grounding cables, minimising cable lengths and contributing to a more efficient and cost-effective design of the vehicle 2.

[0110] In addition, the ability to create grounding connections on coated surfaces eliminates the need for additional steps to remove coatings from specific areas, which can simplify the manufacturing process and reduce production time and costs. These advantages contribute to a more efficient and streamlined assembly process while ensuring high conductivity and reliable electrical grounding throughout the vehicle 2.

[0111] Furthermore, since the threaded portion 3 of the fastener 1 comprises thread-forming threads 4, it can be ensured that the fastener 1 is securely retained in a hole 5’ after being inserted therein. Accordingly, in this manner, it can be further ensured that the fastener 1 is securely retained in the hole 5’, even when forces are applied to the cable 30 connected to the terminal connector 13.

[0112] In addition, since the centre axis c1 of at least the first attachment hole hi is arranged at an angle a1 within the above specified range relative to the main axis mA of the fastener 1, the attachment of a terminal connector 13 to the first head portion 6 of the fastener 1 can be simplified. Moreover, it can be ensured that the fastener 1 is subjected to low torque around the main axis mA of the fastener 1 when tightening the second fastener 11 upon attaching the terminal connector 13 to the first head portion 6 of the fastener 1.

[0113] Furthermore, it can be ensured that the connection between the terminal connector 13, the second fastener 11, and the first head portion 6 remains intact, even under conditions where cables 30 are subjected to movement or external forces. By maintaining the integrity of this connection over time, the durability and reliability of the grounding connection can be further enhanced.

[0114] Furthermore, the simplified attachment process enabled by the angle a1 within the above specified range between the centre axis c1 of the first attachment hole hi and the main axis mA of the fastener 1 can streamline assembly procedures, which can reduce time and costs during manufacturing and assembly of the vehicle 2.

[0115] As mentioned, according to the illustrated embodiments, the part 5 of the vehicle 2, as referred to herein, is embodied by a weld nut welded to a section 7 of the vehicle 2. However, according to further embodiments, the part 5 of the vehicle 2, as referred to herein, may be another part of the vehicle 2, such as a section or part of the chassis 40, a part or section of an arrangement attached to the chassis 40, such as a subframe, the cab 45, or similar.

[0116] Moreover, as mentioned, according to the illustrated embodiments, the fastener 1 attaches a further component 20 to the vehicle 2. Thereby, a vehicle 2 is provided having conditions for being manufactured and assembled in an even more cost-efficient manner. This is because the total number of fasteners in the vehicle can be reduced, because the fastener 1 fulfils two purposes, namely to provide a strong and efficient grounding connection and to attach the further component 20 of the vehicle 2.

[0117] According to some embodiments, the further component 20 comprises a conductive mounting portion, wherein the fastener 1 attaches the conductive mounting portion to the vehicle 2. The mounting portion of the further component 20 comprises a through hole 20’. As can be seen when comparing Fig. 3 and Fig. 4, the threaded portion 3 of the fastener 1 protrudes through the through hole 20’ of the conductive mounting portion of the further component 20 when the grounding assembly 10 is in the assembled state. Moreover, according to the illustrated embodiments, the second head portion 16 of the fastener 1 abuts against the conductive mounting portion of the further component 20 when the grounding assembly 10 is in the assembled state. In this manner, a high electrical conductivity can be obtained between the fastener 1 and the conductive mounting portion of the further component 20, while also rigidly attaching the mounting portion of the further component 20 to the section 7 of the vehicle 2.

[0118] The further component 20 may comprise an electric device requiring grounding, wherein a grounding cable of the electric device is electrically connected to the conductive mounting portion of the further component 20. In this manner, the need for grounding cables within the vehicle 2 can be reduced, which can contribute to a more efficient and cost-effective vehicle design. Furthermore, conditions are provided for utilizing the available space within the vehicle 2 in a more efficient manner, allowing for the integration of additional features or systems within limited spatial constraints. Additionally, this can enhance serviceability by reducing the complexity of wiring and connections, making maintenance and repairs of the vehicle 2 simpler and more cost-efficient.

[0119] As explained above, according to the illustrated embodiments, the fastener 1 of the grounding assembly 10 is used to provide a grounding connection for the electrical system 50 of the vehicle 2, wherein the electrical system 50 has a nominal voltage within the so- called Voltage Class A, usually abbreviated VGA, with a nominal voltage below 60 volts. However, the fastener 1 and the grounding assembly 10 according to the present disclosure may additionally or alternatively be used to provide a grounding connection for an electrical system of the vehicle 2, wherein the electrical system has a nominal voltage within the so- called Voltage Class B, usually abbreviated VCB, with a nominal voltage equal to, or exceeding, 60 volts.

[0120] It is to be understood that the foregoing is illustrative of various example embodiments and that the invention is defined only by the appended independent claims. A person skilled in the art will realize that the example embodiments may be modified, and that different features of the example embodiments may be combined to create embodiments other than those described herein, without departing from the scope of the present invention, as defined by the appended independent claims.

[0121] As used herein, the term "comprising" or "comprises" is open-ended, and includes one or more stated features, elements, steps, components, or functions but does not preclude the presence or addition of one or more other features, elements, steps, components, functions, or groups thereof.

Claims

CLAIMS1. A fastener (1) configured to provide a grounding connection in a vehicle (2), wherein the fastener (1) comprises: a threaded portion (3) comprising thread-forming threads (4) configured to form threads in a hole (5’) of a part (5) of the vehicle (2) upon rotation of the fastener (1) around a main axis (mA) thereof, and a first head portion (6) comprising a first attachment hole (h 1 ), wherein the first attachment hole (hi) is configured to receive a second fastener (11) for attaching a terminal connector (13) to the first head portion (6) of the fastener (1), wherein the centre axis (c1) of the first attachment hole (hi) is arranged at an angle (a1) relative to the main axis (mA) of the fastener (1), and wherein the angle (a1) is within the range of 30 - 150 degrees or is within the range of 70 - 110 degrees.

2. The fastener (1) according to claim 1, wherein the first attachment hole (hi) is a through hole.

3. The fastener (1) according to claim 1 or 2, wherein the first head portion (6) comprises a second attachment hole (h2) configured to receive a second fastener (11) for attaching a terminal connector (13) to the first head portion (6), wherein the centre axis (c2) of the second attachment hole (h2) is arranged at an angle (a2) relative to the main axis (mA) of the fastener (1), the angle (a2) being within the range of 30 - 150 degrees, or within the range of 70 - 110 degrees, and wherein the angle (a3) between the centre axes (c1, c2) of the first and second attachment hole (hi, h2) is within the range of 70 - 110 degrees.

4. The fastener (1) according to claim 3, wherein the second attachment hole (h2) is a through hole.

5. The fastener (1) according to any one of the preceding claims, wherein the first head portion (6) has a cuboidal shape.

6. The fastener (1) according to any one of the preceding claims, wherein the fastener (1) comprises a second head portion (16) configured to engage a tool for rotating the fastener (1), and wherein the second head portion (16) is arranged between the first head portion (6) and the threaded portion (3) of the fastener (1).

7. The fastener (1) according to claim 6, wherein the second head portion (16) has a hexagonal shape.

8. The fastener (1) according to any one of the preceding claims, wherein the first head portion (6) is located at a distal end (1”) of the fastener (1).

9. A vehicle (2) comprising a grounding assembly (10) for providing a grounding connection in the vehicle (2), wherein the grounding assembly (10) comprises a fastener (1) according to any one of the preceding claims.

10. The vehicle (2) according to claim 9, wherein the part (5) of the vehicle (2) is formed as a weld nut, and wherein the part (5) is welded to a section (7) of the vehicle (2).

11. The vehicle (2) according to claim 9 or 10, wherein the fastener (1) attaches a further component (20) to the vehicle (2).

12. A method (100) of providing a grounding connection in a vehicle (2) using a fastener (1) according to any one of the claims 1 - 8, wherein the method (100) comprises the steps of: providing (110) a hole (5’) in a part (5) of the vehicle (2), forming (120) threads in the hole (5’) by rotating the fastener (1) around the main axis (mA) thereof with the threaded portion (3) inserted in the hole (5’), and then attaching (130) a terminal connector (13) to the first head portion (6) by clamping the terminal connector (13) against the first head portion (6) with a second fastener (11) inserted into the first attachment hole (hi) of the first head portion (6).

13. The method (100) according to claim 12, wherein the step of providing (110) the hole (5’) in the part (5) of the vehicle (2) is performed prior to applying a coating, such as paint, onto the part (5) of the vehicle (2).

14. The method (100) according to claim 12 or 13, wherein the step of forming (120) the threads in the hole (5’) is performed after applying a coating, such as paint, onto the part (5) of the vehicle (2).

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