Vehicle steering device, method for assembling the same and vehicle

Abstract

A vehicle steering device and a vehicle comprise a guide screw rod, which includes a nut coupling part to which a guide nut is coupled, a first coupling area provided at one end of the nut coupling part, and a second coupling area provided at the other end of the nut coupling part, a first connecting rod with a first connecting hole provided at one end into which the first coupling area is inserted and coupled, and a second connecting rod with a second connecting hole provided at one end into which the second coupling area is inserted and coupled.

Description

CROSS-REFERENCE TO A RELATED REGISTRATION

[0001] This application claims priority over Korean patent application No. 10-2024-0129071, which was filed with the Korean Intellectual Property Office on September 24, 2024, and the disclosure of which is incorporated herein by reference. BACKGROUND area

[0002] The present embodiments relate to a vehicle steering device, a method for assembling the same, and a vehicle. More precisely, the present embodiments relate to a vehicle and a vehicle steering device, as well as a method for assembling them, which can satisfy the stiffness of a threaded rod while simultaneously reducing the weight of the threaded rod and the stability of the assembly with a nut, even in a case where the size and weight of the vehicle increase. Description of the state of the art

[0003] In general, a vehicle steering device is equipped with a hydraulic device, motor, reduction gear or similar to steer the vehicle's wheels according to the vehicle's driving conditions, and is normally operated on the rear wheels of a typical vehicle or on the front and rear wheels of a steer-by-wire system.

[0004] In a vehicle steering system, an axial movement of a screw rod is measured by a sensor that detects the movement of a magnet, and the sensor measures the displacement of an object moving in a linear back-and-forth motion, and an electronic control device stably controls the rotation of the vehicle based on the displacement.

[0005] However, the conventional vehicle steering device has the problem that, with the increase in the size and weight of vehicles due to the recent transition to hybrid or electric vehicles, the size and weight of the steering rod have also increased in order to increase the stiffness of the steering rod.

[0006] Furthermore, there is the problem that the measurement accuracy of the steering angle is reduced because the change in the axial displacement of the screw rod cannot be measured accurately if the screw rod is deformed due to its low stiffness.

[0007] Accordingly, research is being conducted to reduce the weight of the screw rod while ensuring the stiffness of the screw rod and the stability of the assembly with the nut, even if the size and weight of the vehicle increase. DEMOLITION

[0008] Accordingly, the present embodiments were developed taking into account the background described above, and one of their objectives is to provide a vehicle steering device that is able to reduce the weight of the screw rod while maintaining the stiffness of the screw rod and satisfying the assembly property with the nut itself in a case where the size and weight of the vehicle increase.

[0009] In one aspect, the present embodiments may provide a vehicle steering device comprising: a screw rod with one end part, another end part and a nut coupling part which is arranged to engage with a nut and is fastened between one end part and the other end part of the screw rod; a first connecting rod with a first connecting hole provided on one end part of the first connecting rod, wherein one end part of the screw rod is arranged in the first connecting hole of the first connecting rod; and a second connecting rod with a second connecting hole provided on one end part of the second connecting rod, wherein the other end part of the screw rod is arranged in the second connecting hole of the second connecting rod.

[0010] Furthermore, in the present embodiments, a screwed area of ​​an outer surface of one end part of the screw rod engages with a screwed area of ​​an inner surface of the first connecting hole of the first connecting rod.

[0011] Furthermore, in the present embodiments, an adhesive may be provided between one end part of the screw rod and the first connecting hole of the first connecting rod.

[0012] Furthermore, in the present embodiments, an outer circumferential projection extending from an outer surface of the screw rod to support the end part of the first connecting part may be provided between the nut coupling part and one end part of the screw rod.

[0013] In the present embodiments, the outer circumferential projection of the screw rod also has a side surface that supports the end part of the first connecting rod and projects in a direction perpendicular to the first connecting rod.

[0014] Furthermore, in the present embodiments, the screw rod has a first recessed area which is deepened from the outer surface of the screw rod between one end part and the outer circumferential projection of the screw rod.

[0015] In the present embodiments, an inner surface of the first connecting hole also has an annular inner circumferential groove that adjoins the end of the first connecting rod.

[0016] Furthermore, in the present embodiments, the outer circumferential projection of the screw rod has a ring shape.

[0017] In the present embodiments, the outer circumferential projection of the screw rod also has a ring shape with a cut surface on an outer circumferential surface of the outer circumferential projection.

[0018] Furthermore, in the present embodiments, the second connecting rod can have an outer connecting hole with a larger diameter than the second connecting hole located at the end of the second connecting rod.

[0019] In the present embodiments, the vehicle steering device may also include a screwed area of ​​an outer surface of the other end part of the screw rod engaging with a screwed area of ​​an inner surface of the second connecting hole of the second connecting rod.

[0020] Furthermore, in the present embodiments, the screw rod includes an interference fit area which is pressed into the inner surface of the outer connecting hole of the connecting rod and is provided between the nut coupling part and the other end part of the screw rod.

[0021] Another end part of the first connecting rod also includes a first fixture mounting area with a recessed shape.

[0022] Furthermore, in the present embodiment examples, another end part of the second connecting rod includes a second device mounting area with a recessed shape.

[0023] In one aspect, the present embodiments may provide a method for assembling a vehicle steering device, the method comprising: aligning one end of a threaded rod and one end of a first connecting rod; coupling a device or tool to a first device mounting area formed at another end of the first connecting rod; screwing the first connecting rod to the threaded rod until one end of the first connecting rod contacts an outer circumferential projection extending from an outer surface of the threaded rod; screwing another end of the threaded rod to one end of a second connecting rod.

[0024] Furthermore, in the present embodiments, the method for assembling a vehicle steering device may also include applying an adhesive to an outer surface of one end of the screw rod and an inner surface of one end of the first connecting rod.

[0025] In the present embodiments, the method for assembling a vehicle steering device may further include coupling the device or tool to a second device assembly area formed at another end of the second connecting rod in order to screw the second connecting rod to the screw rod.

[0026] Furthermore, in the present embodiments, the method for assembling a vehicle steering device may also include an interference fit formed at the other end of the screw rod into an outer connecting hole formed at the other end of the second connecting rod.

[0027] In one aspect, the present embodiments may provide a vehicle comprising: a sliding rod comprising a screw rod with one end part, another end part, and a nut coupling part arranged to engage with and between the one end part and the other end part of the screw rod; a first connecting rod with a first connecting hole provided on one end part of the first connecting rod, wherein one end part of the screw rod is arranged in the first connecting hole of the first connecting rod; and a second connecting rod with a second connecting hole provided on one end part of the second connecting rod, wherein the other end part of the screw rod is arranged in the second connecting hole of the second connecting rod; a nut pulley coupled to the nut;a rod housing that accommodates the nut pulley and the sliding rod; a drive element that is coupled to the rod housing and configured to rotate the nut pulley; a position sensor configured to detect a displacement of the sliding rod; and a control unit configured to receive information transmitted by the position sensor and to transmit a control signal to control the drive element.

[0028] Furthermore, in the present embodiments, the drive element can comprise a motor driven by the control signal from the control unit, a motor pulley coupled to the motor, and a drive belt connecting the motor pulley and the mother pulley.

[0029] According to the embodiments described above, it is possible to provide a vehicle steering device, a method for assembling the same, and a vehicle that can satisfy the stiffness of the screw rod while simultaneously reducing the weight of the screw rod and the stability of the assembly with the nut itself in a case where the size and weight of the vehicle increase.

[0030] The effects of this disclosure are not limited to the effects mentioned above, and other effects not mentioned above will be obviously understood by a person with ordinary knowledge in the field of technology from the following description.

[0031] The objectives to be achieved by the present disclosure, the means of achieving the objectives and the effects of the present disclosure described above do not specify any essential features of the claims, and therefore the scope of the claims is not limited to the disclosure of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings: Fig. 1 and Fig. Figures 2 are perspective views showing part of a vehicle steering device according to the present examples of execution; Fig. Figures 3 to 5 are perspective exploded views showing part of the vehicle steering device according to the present examples of execution; Fig. Figure 6 is a cross-sectional view of the Fig. 2; Fig. 7 and Fig. Figure 8 shows cross-sectional views of part of the vehicle steering device according to the present embodiments; and Fig. Figure 9 is a schematic view showing part of a vehicle according to the present examples of execution. DETAILED DESCRIPTION OF THE EXECUTION FORM

[0033] In the following description of examples or embodiments of the present disclosure, reference is made to the accompanying drawings, which illustrate specific examples or embodiments that can be implemented and in which the same reference numerals and symbols can be used to designate identical or similar components, even if they are shown in different accompanying drawings. Furthermore, the following description of examples or embodiments of the present disclosure omits detailed descriptions of known functions and components where it is determined that such descriptions might render the subject matter of some embodiments of the present disclosure rather unclear.The terms used here, such as "including," "with," "containing," "consisting of," and "formed of," are generally intended to allow the addition of other components, unless the terms are used together with the term "only." The singular forms used here include the plural forms, unless the context clearly indicates otherwise.

[0034] Terms such as "first," "second," "A," "B," "(A)," or "(B)" may be used here to describe elements of revelation. Each of these terms is not used to define the nature, order, sequence, or number of the elements, etc., but merely serves to distinguish the respective element from other elements.

[0035] When it is stated that a first element is "connected or coupled" to a second element, "touches or overlaps" it, etc., this is to be understood as meaning not only that the first element can be "directly connected or coupled" to the second element, or that it can "directly touch or overlap," but also that a third element can be "inserted" between the first and second elements, or that the first and second elements can be "connected or coupled" to each other via a fourth element, or that it can "touch or overlap," etc. Here, the second element can be contained within at least one of two or more elements that are "connected or coupled," "touch or overlap," etc.

[0036] When time-related terms such as "after", "following", "next", "before" and the like are used to describe processes or operations of elements or configurations or of sequences or steps in operational, processing and manufacturing procedures, these terms may be used to describe non-consecutive or non-consecutive processes or operations unless the term "immediately" or "as soon as" is used together.

[0037] Furthermore, when specifying dimensions, relative sizes, etc., it should be considered that numerical values ​​for an element or feature, or corresponding information (e.g., level, range, etc.), include a tolerance or error range that can be caused by various factors (e.g., process factors, internal or external influences, noise, etc.), even if no specific description is provided. Additionally, the term "may" encompasses all meanings of the term "can."

[0038] Fig. 1 and Fig. Figure 2 are perspective views showing part of a vehicle steering device according to the present embodiments. Fig. Figures 3 to 5 are perspective exploded views showing part of the vehicle steering device according to the present examples of execution. Fig. Figure 6 is a cross-sectional view of the Fig. 2, Fig. 7 and Fig. Figure 8 shows cross-sectional views representing part of the vehicle steering device according to the present embodiments, and Fig. Figure 9 is a schematic view representing part of a vehicle according to the present examples of embodiment.

[0039] As shown in these drawings, the vehicle steering device according to the present embodiments comprises a screw rod 131 with an end part 135, another end part 133 and a nut coupling part 134, which is arranged to engage with a nut 115 and is provided between one end part and the other end part of the screw rod 131, a first connecting rod 121 with a first connecting hole 125, which is provided on one end part of the first connecting rod, wherein one end part 135 of the screw rod 131 is arranged in the first connecting hole of the first connecting rod 121, and a second connecting rod 151 with a second connecting hole 153, which is provided on one end part of the second connecting rod 151, wherein the other end part 133 of the screw rod 131 is arranged in the second connecting hole 153 of the second connecting rod 151.

[0040] The screw rod 131 is provided with the nut coupling part 134, which is coupled to the nut 115 in the central area, and one end part 135 is provided at one end of the nut coupling part 134 and the other end part 133 is provided at the other end of the nut coupling part 134.

[0041] The first connecting rod 121 has the first connecting hole 125, into which one end part 135 of the screw rod 131 is inserted and connected to one end of the same, and the second connecting rod 151 has a second connecting hole 153, into which the other end part 133 of the screw rod 131 is inserted and connected to one end of the same.

[0042] This first connecting rod 121, screw rod 131 and second connecting rod 151 are axially connected to each other to form a sliding rod 120 which is installed in the rod housing 101 and takes over the steering of the vehicle while performing a linear sliding movement in the axial direction.

[0043] In addition, a position sensor 110 detects the change in the magnetic field of a magnet (not shown) through the mounting hole 151a formed in the second connecting rod 151, which slides linearly together with the second connecting rod 151, and transmits the change in the axial displacement of the sliding rod 120 to the electronic control unit to determine the steering angle.

[0044] The rod housing 101 is provided with a vehicle body mounting hole 101a for attachment to the body of a vehicle.

[0045] The position sensor 110 is arranged above the rod housing 101 and is connected to a housing cover 113 as a fastening element, and a terminal block 111 is provided on the housing cover 113 for connection to a power source and an electronic control device.

[0046] Furthermore, a through-hole 104 is provided on the lower part of the rod housing 101, through which a sliding rod 120 slides, and a drive part mounting 103b is provided on one side of the rod housing 101, to which a drive part including the nut 115, a bearing, a nut pulley, a motor or the like is attached, as well as a motor mounting hole 105a, to which the motor is attached, and detailed descriptions of the components of the drive part are omitted.

[0047] As in the Fig. 3 and Fig. As shown in Figure 4, the outer surface of one end part 135 and the inner surface of the first connecting hole 125 are provided with screwed areas 135a and 125a that interlock, so that the screw rod 131 and the first connecting rod 121 can be screwed together.

[0048] Furthermore, when screwing the screw rod 131 and the first connecting rod 121 together, an adhesive is applied to the screwed areas 135a and 125a, so that one end part 135 and the first connecting hole 125 can be brought into engagement with the adhesive.

[0049] Accordingly, the screw rod 131 and the first connecting rod 121 are screwed together and then prevented from loosening by the adhesive.

[0050] An outer circumferential projection 137, which extends from the outer circumferential surface and by which the end part of the first connecting rod 121 is held, can be provided between the nut coupling part 134 and the first end part 135.

[0051] Accordingly, the end part of the first connecting rod 121 is supported by the outer circumferential projection 137, and the coupling is maintained by the screw force to prevent loosening.

[0052] This means that in the case of a screw coupling of the screw rod 131 and the first connecting rod 121, the screw connection or coupling is designed in such a way that the fastening force of the tool is adapted to the force for supporting the end part of the first connecting rod 121 by the outer circumferential projection 137, thereby controlling the fastening force and the loosening force of the screw rod 131 and the first connecting rod 121.

[0053] The outer circumferential projection 137 can be designed as a plane whose side surface, on which the end part of the first connecting rod 121 is supported, is perpendicular to the outer circumferential surface of the first connecting rod 121, and the end part of the first connecting rod 121 can be designed as a plane parallel to the side surface of the outer circumferential projection 137.

[0054] Accordingly, in a case where the screw rod 131 and the first connecting rod 121 are screwed together, the end part of the first connecting rod 121 is supported by the outer circumferential projection 137 by the set fastening force of the tool, and in a case where the rotation stops, the central axes of the first connecting rod 121 and the screw rod 131 can be held on the same axis.

[0055] Furthermore, a first recessed area 136, which is designed to be recessed from the outer surface of one end part 135, can be provided between one end part 135 and the outer circumferential projection 137, and the first recessed area 136 can be designed as a concave curved surface on the outer surface.

[0056] This first groove area 136 makes it possible to compensate for manufacturing or assembly errors in the first connecting hole 125 formed in the first connecting rod 121.

[0057] This means that in a case where a manufacturing defect or an assembly defect occurs in the first connecting hole 125 without the first groove area 136, deformation may occur at the entrance of the first connecting hole 125 during assembly, and as a result, cases may occur where the screw rod 131 and the first connecting rod 121 are not held in a coaxial state when the coupling between them is completed.

[0058] In a case where the first groove area 136 is provided, the deformation of the inlet section of the first connecting hole 125 is absorbed by the space of the first groove area 136, so that the central axes of the first connecting rod 121 and the screw rod 131 can be kept coaxial.

[0059] Furthermore, the first connecting hole 125 can be provided with an annular inner circumferential groove 124 on the inner surface adjacent to the end that is supported by the outer circumferential projection 137.

[0060] In the inner circumferential groove 124, in the event of a manufacturing or assembly error in the first connecting hole 125, the deformation of the entrance of the first connecting hole 125 is compensated by the space of the inner circumferential groove 124, whereby the central axes of the first connecting rod 121 and the screw rod 131 can be kept coaxial.

[0061] The outer circumferential projection 137 can be shaped in such a way that it protrudes in a ring shape and can have a cross-sectional surface 137a on the outer circumferential surface.

[0062] Furthermore, the cut surface 137a can be provided as a mutually facing plane on the outer circumferential surface of the outer circumferential projection 137.

[0063] Accordingly, in the case of a screw connection between the first connecting rod 121 and the screw rod 131, a tool can be attached to the cut surface 137a of the outer circumferential projection 137, which facilitates assembly.

[0064] Meanwhile, the second connecting rod 151, as in the Fig. shown in Figures 3 to 8, formed with an enlarged diameter at the end of the second connecting hole 153 and provided with an outer connecting hole 154, which is located at the end part of the second connecting rod 151.

[0065] Furthermore, screwed areas 133a and 153a can be provided which engage with the outer surface of the other end part 133 and the inner surface of the second connecting hole 153.

[0066] Accordingly, the screw rod 131 and the second connecting rod 151 can be screwed together.

[0067] An adhesive is applied to the screwed areas 133a and 153a so that the other end part 133 and the second connecting hole 153 can interlock.

[0068] This prevents the screw rod 131 and the second connecting rod 151 from coming loose after being screwed together by the adhesive.

[0069] A press-fit area 139, which is pressed into the inner surface of the outer connecting hole 154, can be provided between the nut coupling part 134 and the second connecting part 133.

[0070] Accordingly, in a case where the screw rod 131 and the second connecting rod 151 are screwed together, the press fit area 139 is pressed in so that even in a case where the manufacturing defect or the assembly defect occurs in the screwed areas 133a and 153a, the central axes of the screw rod 131 and the second connecting rod 151 can be kept on the same axis.

[0071] This means that even in a case where deformation of the bolted areas 133a and 153a occurs due to a manufacturing or assembly error of the bolted areas 133a and 153a, the bolted connection is achieved while maintaining the same axis, since the press fit area 139 of the bolted rod 131 is pressed into the outer connecting hole 154.

[0072] Furthermore, an outer circumferential groove 138, recessed in the outer surface of the press fit area 139, can be provided between the press fit area 139 and the other end part 133, and the outer circumferential groove 138 can be designed as a concave curved surface on the outer surface.

[0073] In a case where the manufacturing or assembly defect occurs in the press fit area 139 and the outer connecting hole 154, the deformation of the press fit area 139 and the outer connecting hole 154 is absorbed into the space of the outer groove 138, thereby keeping the central axes of the screw rod 131 and the second connecting rod 151 coaxial.

[0074] Furthermore, at the other end of the first connecting rod 121, another end part of the first connecting rod 121 with a first tool mounting area 123 having a recessed shape can be provided, and another end part of the second connecting rod 151 includes a second tool mounting area 155 having a recessed shape and can be provided at the other end of the second connecting rod 151.

[0075] Accordingly, a device or tool is coupled to the first tool mounting area 123 of the first connecting rod 121 and the second tool mounting area 155 of the second connecting rod 151, and the screw rod 131 is assembled so that the screw connection is formed while maintaining the same axis and damage to the outer surfaces of the first connecting rod 121 and the second connecting rod 151 during assembly can be prevented.

[0076] Additionally, the first connecting rod 121 can be designed as a hollow body with first connecting holes 125 on both sides in the axial direction.

[0077] This means that the first connecting hole 125 can pass through one end and the other end of the first connecting rod 121, thereby reducing weight and material costs.

[0078] Furthermore, the second connecting rod 151 can be shaped such that the other end is hollow. That is, the second connecting hole 153 can be formed at one end based on the fastening hole 151a, and the other end can be hollow, thereby reducing weight and material costs.

[0079] The above-described method for assembling a vehicle steering device comprises aligning one end of the screw rod 131 and one end of a first connecting rod 121, coupling a device or tool to the first device mounting area 123 formed at the other end of the first connecting rod 121, screwing the first connecting rod 121 until a supporting force of one end of the first connecting rod 121 through the outer circumferential projection 137 formed on the outer circumferential side of the screw rod 131 reaches a set fastening force, and screwing the other end of the screw rod 131 to one end of the second connecting rod 151.

[0080] That is, as in the Fig. 3 and Fig. As shown in Figure 4, one end of the screw rod 131 and one end of the first connecting rod 121 are aligned coaxially, and one end part 135 is screwed to the first connecting hole 125.

[0081] When screwing the first connecting rod 121, an adhesive can be applied to the outer surface of one end of the screw rod 131, i.e., to the outer surface of one end part 135, and to the inner surface of one end of the first connecting rod 121, i.e., to the inner surface of the first connecting hole 125, and the first connecting rod 121 can be screwed in.

[0082] Then a device or tool is coupled to the first device mounting area 123, which is formed in a recessed form at the other end of the first connecting rod 121, in order to rotate the first connecting rod 121, and thus the first connecting rod 121 is screwed together.

[0083] The first connecting rod 121 is screwed together until a supporting force of one end of the first connecting rod 121 by the outer circumferential projection 137, which is formed on an outer circumferential side of the screw rod 131, reaches a specified fastening force, and while the end part of the first connecting rod 121 is supported by the outer circumferential projection 137, the connection is maintained by the screw tightening force, thus preventing loosening.

[0084] When screwing the second connecting rod 151 together, as described in the Fig. 3 and Fig. As shown in Figure 5, a device or tool is coupled to the second device mounting area 155 formed at the other end of the second connecting rod 151, and the second connecting rod 151 is rotated and screwed in place.

[0085] Furthermore, when screwing the second connecting rod 151, the press-fit area 139 formed at the other end of the screw rod 131 is pressed into the outer connecting hole 154 formed at the other end of the second connecting rod 151 and screwed in place.

[0086] Accordingly, the press-fit area 139 is pressed in while the screw rod 131 and the second connecting rod 151 are screwed together, so that even in the event of a manufacturing or assembly error in the screwed areas 133a and 153a the central axes of the screw rod 131 and the second connecting rod 151 can be kept on the same axis.

[0087] However, with reference to the Fig. 1 to 8 together with Fig. 9 a vehicle according to the present embodiments comprising the sliding rod 120, which connects the screw rod 131 with the nut coupling part 134, with which the nut 115 is coupled, one end part 135, which is provided at one end of the nut coupling part 134, and the other end part 133, which is provided at the other end of the nut coupling part 134, wherein the first connecting rod 121 has the first connecting hole 125, which is provided at one end, into which one end part 135 is inserted and coupled, and the second connecting rod 151 has the second connecting hole 153, which is provided at one end, into which the other end part 133 is inserted and coupled, wherein the nut pulley 117 is coupled to the outer circumference of the nut 115, the rod housing 101 (see Fig. 1), in which the nut pulley 117 and the sliding rod 120 are installed, drive elements 191, 192, 195 and 117, which are coupled to the rod housing and rotate the nut pulley 117, the position sensor 110 (see Fig. 1), which detects and transmits an axial displacement of the sliding rod 120, and an electronic control device 190 which receives information transmitted by the position sensor and transmits a control signal to the drive element.

[0088] The sliding load of 120 is the same as described above, so a detailed description is unnecessary.

[0089] As in Fig.As shown in Figure 9, an angle sensor 175 and a torque sensor 177 are coupled to one side of a steering shaft 173 which is connected to a steering wheel 171, and in a case where the driver operates the steering wheel 171, the angle sensor 175 and the torque sensor 177 detect the operation of the driver and send an electrical signal to the electronic control device 190, so that a steering shaft motor 180 and a motor 192 of the drive element are actuated.

[0090] The electronic control device 190 controls the steering shaft motor 180 and the motor 192 of the drive element on the basis of electrical signals transmitted by the angle sensor 175 and the torque sensor 177, as well as electrical signals transmitted by various sensors attached to the vehicle.

[0091] The steering shaft motor 180 is connected to a reduction gear which reduces the speed of the motor, and during normal driving a reaction force is exerted on the steering shaft 173 so that the driver can feel a steering reaction force in the opposite direction if the driver operates the steering wheel 171, and during autonomous driving the steering is carried out by the control of the electronic control device 190 without the intervention of the driver's will.

[0092] The motor 192 of the drive element pushes the sliding rod 120 through the belt 195 and the nut 115 to steer the wheels 161 on both sides via the tie rod 163 and the steering knuckle 165.

[0093] The drive element comprises the nut pulley 117 coupled to the nut 115, the motor pulley 191 coupled to the motor 192 and connected to the nut pulley 117 by the drive belt 195, and the drive belt 195 connecting the motor pulley 191 and the nut pulley 117, and in a case where the nut pulley 117 rotates, the sliding rod 120 slides in the axial direction.

[0094] For the sake of simplicity, the drawings of the present embodiments describe, for example, that the angle sensor 175 and the torque sensor 177, which are provided in the steering shaft 173, as well as the vehicle speed sensor 112, the position sensor 110, the ultrasonic sensor 114 and the image sensor 116 are provided for transmitting steering information to the electronic control unit 190. However, a motor position sensor, various types of radar and lidar devices and similar components can also be provided, the detailed description of which is omitted here.

[0095] According to these examples, it is possible in the vehicle steering device to meet the stiffness of a screw rod while simultaneously reducing the weight of the screw rod and ensuring the stability of the assembly with the nut, even if the size and weight of the vehicle increase.

[0096] The above description has been presented to enable any person skilled in the art to realize and utilize the technical idea of ​​this disclosure and has been provided in connection with a specific application and its requirements. Various modifications, additions, and substitutions of the described embodiments are readily apparent to the person skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this disclosure. The above description and the accompanying drawings represent an example of the technical idea of ​​this disclosure and serve only for illustration. That is to say, the embodiments shown serve to illustrate the scope of the technical idea of ​​this disclosure.Therefore, the scope of the present disclosure is not limited to the examples shown, but has the broadest scope that is compatible with the claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2024-0129071

[0001]

Claims

[1] Vehicle steering device comprising: a screw rod (131) with one end part (135), another end part (133) and a nut coupling part (134) which is designed to engage with a nut (115) and is provided between one end part (135) and the other end part (133) of the screw rod (131); a first connecting rod (121) with a first connecting hole (125) provided at an end part of the first connecting rod (121), wherein one end part (135) of the screw rod (131) is arranged in the first connecting hole (125) of the first connecting rod (121); and a second connecting rod (151) with a second connecting hole (153) provided at an end part of the second connecting rod (151), wherein the other end part (133) of the screw rod (131) is arranged in the second connecting hole (153) of the second connecting rod (151). [2] Vehicle steering device according to claim 1, wherein a screwed area (135a) of an outer surface of one end part (135) of the screw rod (131) engages with a screwed area (125a) of an inner surface of the first connecting hole (125) of the first connecting rod (121). [3] Vehicle steering device according to claim 2, wherein an adhesive is provided between one end part (135) of the screw rod (131) and the first connecting hole (125) of the first connecting rod (121). [4] Vehicle steering device according to claim 2 or 3, wherein an outer circumferential projection (137) extending from an outer surface of the screw rod (131) to support the end part of the first connecting rod (121) is provided between the nut coupling part (134) and the one end part (135) of the screw rod (131). [5] Vehicle steering device according to claim 4, wherein the outer circumferential projection (137) of the screw rod (131) has a side surface which supports the end part of the first connecting rod (121) and projects in a direction perpendicular to the first connecting rod (121). [6] Vehicle steering device according to claim 4 or 5, wherein the screw rod (131) has a first recessed area (136) which is recessed towards the outer surface of the screw rod (131) between the one end part (135) and the outer circumferential projection (137) of the screw rod (131). [7] Vehicle steering device according to one of the preceding claims, wherein the second connecting rod (151) has an outer connecting hole (154) which has a larger diameter than the second connecting hole (153) and is located at the end part of the second connecting rod (151). [8] Vehicle steering device according to claim 7, wherein a screwed area (133a) of an outer surface of the other end part (133) of the screw rod (131) engages with a screwed area (153a) of an inner surface of the second connecting hole (153) of the second connecting rod (151). [9] Vehicle steering device according to claim 7 or 8, wherein the screw rod (131) comprises an interference fit area (139) which is pressed into the inner surface of the outer connecting hole (154) of the connecting rod (151) and is provided between the nut coupling part (134) and the other end part (133) of the screw rod (131). [10] Method for assembling a vehicle steering device, the method comprising: Aligning one end (135) of a screw rod (131) and one end of a first connecting rod (151); Coupling a device or tool with a first device mounting area (123) formed at another end of the first connecting rod (121); Screw the first connecting rod (121) to the screw rod (131) until one end of the first connecting rod (121) contacts an outer circumferential projection (137) that protrudes from an outer surface of the screw rod (131); and Screwing another end (133) of the screw rod (131) to one end of a second connecting rod (151). [11] Method according to claim 10, further comprising applying an adhesive to an outer surface of one end (135) of the screw rod (131) and an inner surface of one end of the first connecting rod (121). [12] Method according to claim 10 or 11, further comprising coupling the device or tool with a second device mounting area (155) formed at another end of the second connecting rod (151) to screw the second connecting rod (151) to the screw rod (131). [13] Method according to claim 12, further comprising pressing in an interference fit area (139) formed at the other end (133) of the screw rod (131) into an outer connecting hole (154) formed at the other end of the second connecting rod (151). [14] Vehicle, comprising: a sliding rod (120) with a screw rod (131) having an end part (135), another end part (133) and a nut coupling part (134) which is arranged to engage with a nut (115) and is provided between one end part (135) and the other end part (133) of the screw rod (131), a first connecting rod (121) with a first connecting hole (125) provided on an end part of the first connecting rod (121), wherein one end part (135) of the screw rod (131) is arranged in the first connecting hole (125) of the first connecting rod (121), and a second connecting rod (151) with a second connecting hole (153) provided on an end part of the second connecting rod (151), wherein the other end part (133) of the screw rod (131) is arranged in the second connecting hole (153) of the second connecting rod (151) is ordered; a nut pulley (117) connected to the nut (155); a rod housing (101) that accommodates the nut pulley (117) and the sliding rod (120); a drive element (191, 192, 195, 117) which is coupled to the rod housing (101) and arranged to rotate the nut pulley (120); a position sensor (110) configured to detect the displacement of the sliding rod (120); and a control unit (190) which is configured to receive information transmitted by the position sensor (110) and to transmit a control signal to control the drive element (191, 192, 195, 117). [15] Vehicle according to claim 14, wherein the drive element comprises: a motor (192) which is driven by the control signal from the control unit (190), a motor pulley (191) coupled to the motor (192), and a drive belt (195) that connects the motor pulley (191) and the mother pulley (117).

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