Longitudinal adjuster and vehicle seat

Abstract

The invention relates to a longitudinal adjuster (10) for a seat, in particular a vehicle seat (1), comprising at least one track pair, which is formed by a first track (12) and a second track (14), wherein the tracks (12, 14) form an inner channel (16) and the first track (12) is displaceable relative to the second track (14) in a longitudinal direction (x). A spindle nut (30) connected to the second track (12) and a spindle (20) having an outer thread (22) which cooperates with an inner thread (32) of the spindle nut (30) are arranged in the inner channel (16), a spindle gear mechanism (50) which can be driven by a motor (60) and which cooperates with the spindle (20) is arranged on an end of the first track (12). A contact section or tensioning section (133) is provided and arranged in such a way that the thread flanks of the outer thread (22) of the spindle (20) and the thread flanks of the inner thread (32) of the spindle nut (30) are held in such a way that they are pretensioned relative to one another in an axial direction and / or in a radial direction. The invention further relates to a vehicle seat (1) comprising such a longitudinal adjuster (10).

Description

Technical Field

[0001] This invention relates to a longitudinal adjuster, particularly for vehicle seats. The invention further relates to a vehicle seat having such a longitudinal adjuster. Background Technology

[0002] Spindle drive mechanisms for adjusting seats in vehicles, and longitudinal adjusters for seats, particularly vehicle seats, are known from the prior art. In each case, the drive mechanism includes, for example, a spindle, a spindle nut, a gear mechanism, and a retaining device. The spindle defines a spindle axis and has a spindle thread extending in the longitudinal direction. The spindle nut can be securely fastened to a first track component and has an internal thread that engages with the spindle thread. The gear mechanism can be mounted on another corresponding track component and selectively rotates the spindle about the spindle axis.

[0003] DE 10 2005 023 095 A1 discloses a drive mechanism of the discussed type for a motor vehicle seat in a sliding device. The drive mechanism for use with a motor vehicle seat sliding device includes fixed and movable track components assembled together and movable between a front position and a rear position. The drive mechanism includes an elongated spindle, a spindle nut, a gear mechanism, and a mounting device. The spindle defines a spindle axis and has a spindle thread extending in a longitudinal direction. The spindle nut can be securely fastened to a first track component and has an internal thread that can engage in the spindle thread. The gear mechanism can be mounted on another corresponding track component and selectively rotates the spindle about the spindle axis. The spindle of the drive mechanism is provided with a spindle wheel that, in the mounted state of the drive mechanism, extends outward through a spindle wheel opening in the movable track component.

[0004] DE 10 2006 000 193 A1 discloses a seat sliding device having a system with a floating threaded spindle and a fixed nut. The nut is fastened to a lower track, thereby driving the threaded spindle to rotate, allowing the upper structure to move forward and backward. Once this system is applied, the nut is fastened to the lower track.

[0005] DE 10 2008 024 141 A1 discloses a spindle bearing arrangement for a seat longitudinal adjustment gear. This spindle bearing arrangement has a housing capable of being fastened to a component fixed to a vehicle or to a component fixed to a seat via a fastening arrangement. A spindle opening for guiding a spindle through the spindle along its opening axis passes through the housing, and an internal thread within the housing is configured in the region of its spindle opening to engage the spindle thus guided through, for adjusting the housing and the spindle relative to each other along the spindle opening axis. The spindle bearing arrangement specifies that the internal thread is configured in a spindle nut, and the spindle nut is adjustably mounted in the housing relative to the spindle opening axis.

[0006] DE 10 2014 201 582 A1 discloses an alternative drive mechanism for a motor vehicle seat, which has a main shaft fixedly and non-rotatably held in a first track fixed to the vehicle, together with a driven main shaft gear mechanism held in a second track fixed to the seat. This type of drive mechanism does not have a fixed main shaft nut.

[0007] US2010 / 0 044 542A1 discloses a drive device comprising: a spindle; a bearing element having a bore through which the spindle is guided; and a nut element disposed within the bearing element and including a nut having an internal thread, wherein an external thread of the spindle engages with the internal thread. The nut element is axially movable relative to the bearing element. The drive device has an elastic housing disposed between the nut element and the bearing element. The elastic housing also has a bore whose axial center point coincides with the internal thread of the nut, elastically retaining the external thread of the spindle on an inner circumferential surface.

[0008] DE 10 2004 048 228 A1 discloses an adjustment device comprising a nut floatingly mounted on a rigid slider and a spindle drive screwed into the nut, wherein the spindle drive is rotatably mounted in a bearing fixedly connected to the slider without radial clearance.

[0009] DE 603 ​​16 483T2 discloses an electric seat for a vehicle, comprising an upper rail fixedly attached to the seat, a lower rail fixedly attached to the vehicle floor, a nut unit fixedly attached to one of the upper or lower rails, a motor guided through the nut unit and respectively attached to the other of the upper or lower rails, and a gear unit including a gear unit for transmitting torque of the motor to the drive shaft. The nut unit includes: a nut block having a through-hole with internal threads through which the drive shaft passes; a retainer having a front upright wall, a rear upright wall, and a connecting portion connecting the front and rear upright walls to define a space for receiving the nut block, wherein both the front and rear upright walls have outwardly projecting support walls.

[0010] US 5,860,319 A discloses a drive mechanism suitable for an electric seat adjuster. The drive mechanism includes a rotatable threaded shaft disposed between an upper rail and a lower rail. The threaded shaft is movably mounted relative to a fixed lower rail. Coaxial openings are configured in opposite side arms of the housing for fastening a drive block to the lower rail. The drive block has a hole for threaded engagement with the threaded shaft. The drive block is arranged coaxially aligned with the openings in the two side arms of the housing. An elastic cushioning mechanism fills the housing and surrounds the drive block to isolate the drive block from the housing and the lower rail, preventing vibration. Summary of the Invention

[0011] The object of this invention is to improve the type of longitudinal adjuster mentioned in the introduction, and in particular to provide a longitudinal adjuster with a fixed spindle nut that allows for improved clearance elimination and / or improved tolerance compensation, and reduces or prevents potentially destructive noise in the area of ​​the spindle nut. Another object of this invention is to provide a corresponding vehicle seat.

[0012] Solution

[0013] According to the invention, this object is achieved by a longitudinal adjuster, particularly a longitudinal adjuster for a vehicle seat, wherein the longitudinal adjuster includes at least one track pair formed by a first track and a second track, wherein these tracks surround each other to form an internal channel, and the first track is displaceable relative to the second track in the longitudinal direction, wherein a spindle nut connected to the second track and a spindle having an external thread cooperating with the internal thread of the spindle nut are arranged in the internal channel, wherein a spindle gear mechanism, which can be driven by a motor and cooperates with the spindle, is arranged at one end of the first track, wherein a damping element or damping module is provided and arranged such that the spindle and the spindle nut are held relative to each other in a pre-tensioned manner in the axial and / or radial directions.

[0014] The damping element according to the first exemplary embodiment or the damping module according to the second exemplary embodiment can substantially eliminate and / or compensate for the free axial and / or radial clearance between the spindle and the spindle nut. Furthermore, the present invention offers the advantage of significantly increased service life and lifespan of the longitudinal adjuster. Additionally, destructive noise generated by oscillations and / or vibrations between the components of the longitudinal adjuster during operation is significantly reduced.

[0015] Advantageous embodiments that can be used alone or in combination with each other form the subject matter below.

[0016] According to a first exemplary embodiment, the spindle nut may have a single damping element that pretensions the spindle radially relative to the internal thread of the spindle nut along a first direction, such that the thread flank of the external thread is pushed against the thread flank of the internal thread. According to the first exemplary embodiment, the spindle nut may also be designed to pretension the spindle radially relative to the internal thread of the spindle nut along a first direction, such that the thread flank of the external thread is pushed against the thread flank of the internal thread. As a result, the radial distance between the thread flanks of the external thread and the thread flanks of the internal thread increases or may increase along a second direction opposite to the first direction.

[0017] Because the spindle nut has a damping element or damping module, free axial clearance can be eliminated. In each case, the damping element or damping module pretensions the spindle radially relative to the internal thread of the spindle nut in a first direction, such that the thread flank of the external thread is pushed against the thread flank of the internal thread, and the radial distance between the thread flanks of the external and internal threads increases in a second direction opposite to the first direction.

[0018] In another embodiment, the damping element is fastened to the spindle nut. The damping element is configured as a clamping element or a clip element.

[0019] The spindle is preferably radially pushed relative to the internal thread of the spindle nut in a first direction, such that the spindle is eccentrically arranged relative to the internal thread in the first direction.

[0020] The first track is preferably a seat track that can be connected to the vehicle seat. The second track is preferably a floor track that can be connected to the vehicle structure. Possible internal structures, operating modes, and functions of the spindle gear mechanism are disclosed, for example, in DE 102013 207 665 A1, the relevant disclosure of which is expressly incorporated herein by reference.

[0021] The spindle can be mounted on the front end of the spindle in the spindle gear mechanism. The spindle can also be mounted on the rear end of the spindle in the rotary bearing of the first track.

[0022] The spindle nut can be secured to the second rail by at least one fixing element, particularly two fixing elements (especially in the form of bolts). The fixing element can be guided through a corresponding opening in the second rail. The spindle nut can have at least one, particularly two, threaded holes, which in each case cooperate with the fixing element.

[0023] The spindle nut may have a body. The spindle nut may have a continuous threaded hole with internal threads, particularly a threaded hole parallel to the longitudinal direction. The spindle nut may have an opening aligned with the threaded hole, particularly for spindle entry or exit. The internal thread of the spindle nut may be operably connected to the external thread of the spindle. In particular, the spindle nut is designed as a one-piece assembly. The external thread of the spindle and the internal thread of the spindle nut may, in each case, be trapezoidal threads. The trapezoidal threads may have a tooth flank clearance. The spindle may be rotatably mounted along its axis. In the region of the spindle nut, the spindle may be pushed in a first direction radially relative to the spindle axis, causing the spindle to bend eccentrically relative to the spindle axis. The first direction may be oriented vertically downwards. The second direction may be oriented vertically upwards. The first direction may be oriented along the direction of the base of the second track. The second direction may be oriented along the direction of the base of the first track.

[0024] The spindle nut may have a corresponding guide surface in each region adjacent to the internal thread along the axial direction. The guide surface may be designed in the form of an internal cone. The guide surface may have an internal cone shape that opens outwards along the axial direction. The diameter of the opening of the spindle nut, particularly in the region of the guide surface, may decrease inwards along the direction of the threaded hole. The diameter of the opening may increase outwards, particularly by widening it.

[0025] The damping element may be a plastic bushing. The damping element or damping module may have at least one contact portion that surrounds the spindle in some parts.

[0026] The damping element may have two opposing contact portions. In each case, the contact portions surround the main shaft in some sections. The contact portions of the damping element may have at least one contact section that contacts the main shaft in some sections. Preferably, the contact portions of the damping element extend to their maximum extent along half of the circumference of the main shaft.

[0027] Damping elements can be made of plastic. Damping elements can be made of thermoplastic materials. Damping elements can be made of polyoxymethylene (POM).

[0028] In another embodiment, the damping element is configured as a single piece. For example, the damping element is an injection-molded part. The damping element can be configured as multiple pieces. For example, the damping element includes two damping halves, which are, for example, arranged in a mirror-symmetrical manner. The damping halves are forcibly and / or non-forcibly connected together, for example, by material bonding. The damping element may have a coating and / or flocking, for example, made of a low-friction and / or damping material.

[0029] The contact portion, particularly the contact section, may have a contact surface that contacts the external thread of the spindle. The contact portion, particularly the contact section, may abut against the outer periphery of the external thread of the spindle using the contact surface. The contact surface may have a convex profile in the direction along the spindle axis. The contact surface may extend at least twice the pitch of the external thread of the spindle.

[0030] The contact portion can have a tapered profile. The contact portion can have a profile in the form of an external cone. The contact portion can have a spherical profile. The profile or external profile of the contact portion can contact the lead-in surface of the spindle nut. The contact portion can cooperate with the lead-in surface of the spindle nut through its profile or external conical surface.

[0031] The contact portion entering the opening in the region of the introduction surface can increase the force in the radial direction, thereby pushing the spindle in the first direction. At least two contact segments of the contact portion can be connected together by a membrane hinge.

[0032] The damping element may have at least two spring-elastic portions. These spring-elastic portions can be elastically pre-tensioned in the installed state. The damping element may have at least two spring-elastic portions that subject at least one contact portion to a first force along the direction of the spindle nut, particularly in the direction of one of the lead-in surfaces. Preferably, the damping element has an even number of spring-elastic portions.

[0033] A spring-elastic portion can apply a first force to two contact portions, the first force being applied to or toward each other, the two contact portions being opposite each other along the axial direction of the spindle. At least two spring-elastic portions can be respectively arranged on opposite sides of the spindle nut. At least two spring-elastic portions can be respectively arranged parallel to the spindle axis on opposite sides of the spindle nut. Due to material properties and / or also due to the shape of the spring-elastic portions, the at least two spring-elastic portions can acquire their spring-elastic characteristics.

[0034] At least two spring-elastic portions can be connected together via at least one connecting portion. At least two spring-elastic portions can be connected together on two opposite sides of the spindle nut via the connecting portion. At least one connecting portion can act on at least one contact section of the contact portion. At least one contact portion can be arranged on the connecting portion. For example, the connecting portions are pre-tensioned relative to each other, such that they have spring forces oriented towards each other.

[0035] The tapered profile of the contact portion operably connected to a corresponding lead-in surface of the spindle nut can transform a first force oriented parallel to the spindle axis into a second force oriented radially in the direction of the spindle. This can be achieved through a wedge-like action. The spindle can be pushed in the first direction by the second force applied radially.

[0036] Vibrations from a motor vehicle during operation or engine running can be transmitted to or induced within the main shaft. In the case of an oscillating main shaft, especially when vibrations are transmitted from the main shaft, a change in the direction of the second force can generate a force acting in opposition to the first force.

[0037] Vibration damping, particularly attenuation, can be achieved through small movements of the contact portion profile along the lead-in surface of the spindle nut and the resulting frictional force. Due to the damping element's damping of the spindle's radial vibration, the external threads of the spindle can be prevented from radially impacting the internal threads of the spindle nut.

[0038] According to a second exemplary embodiment, the damping module includes two tensioning elements, which in each case are arranged at one end of the spindle nut and connected together, and are held relative to each other in a pre-tensioned manner via spring elements specifically formed of metal.

[0039] According to a second exemplary embodiment, the damping module enables the substantial elimination and / or compensation of free axial and radial clearances between the spindle and the spindle nut.

[0040] Furthermore, the present invention offers the advantage of increased service life and operating time of the longitudinal adjuster. Additionally, destructive noise generated during operation of the longitudinal adjuster by oscillations and / or vibrations between its components in the axial and radial directions is significantly reduced. A relatively permanent and constant pretension force of the damping module is achieved through the use of spring elements, particularly those formed of metal, such as metal springs and / or worm springs.

[0041] For example, the thread flanks of the spindle nut and the spindle can be held relative to each other, particularly in contact, in a pre-tensioned manner by a damping module, such that they remain backlash-free relative to each other. In other words, free axial and radial backlash between the spindle nut and the spindle is essentially eliminated. The spindle is subjected to a defined force in the radial direction, particularly a pushing force. Free axial backlash can be eliminated because the spindle nut has a damping module that pre-tensions the spindle radially relative to the internal thread of the spindle nut, such that the thread flanks of the external thread are pushed against the thread flanks of the internal thread. The pushing direction of the spindle is positioned, for example, downward (along the direction of gravity).

[0042] The damping module may have two tensioning elements that contact the spindle at certain portions. In the mounted state of the damping module, the tensioning elements may form opposite end portions of the damping module. The tensioning elements may be configured, for example, in the form of contact portions.

[0043] In each case, the tensioning element may have at least one tensioning section in contact with the spindle. Alternatively or optionally, in each case, the tensioning section may surround the spindle at least in some portions. The tensioning section may be configured, for example, in the form of a contact section or contact portion.

[0044] The spindle nut may have internal threads. An introduction surface may be provided on a corresponding end of the internal thread. The introduction surface may have an internally tapered shape pointing outward in the axial direction, particularly an open internally tapered shape.

[0045] A damping module can be mounted on the spindle nut such that it contacts the spindle and holds the spindle in a pre-tensioned manner within the region of the respective lead-in surface. The damping module may have, for example, two tensioning elements that contact the spindle in some sections.

[0046] The corresponding tensioning section may, for example, protrude substantially vertically from the disc-shaped body of the tensioning element. The corresponding tensioning section may have, for example, a tensioning force, such as a pre-tensioning force and / or a spring force.

[0047] A corresponding tensioning element may have at least one tensioning section or multiple tensioning sections, such as at least two. Multiple tensioning sections may be connected together. For example, a flexible connection may be provided in the connection area of ​​two adjacent tensioning sections. Each tensioning section may have a contact surface that contacts the external thread of the spindle. The corresponding tensioning section may abut against the outer periphery of the external thread of the spindle using its contact surface.

[0048] The damping module may have at least one tab in an adjacent region of at least one tensioning section, for example, below and / or above the tensioning section. At least one tab may be configured to retain the tab. The damping module may be pre-positioned by at least one tab during installation onto the spindle nut, wherein the spindle may subsequently be screwed in.

[0049] To connect the tensioning element, the corresponding tensioning element may have multiple retaining portions and may additionally provide a spring element, particularly a retaining spring. At least one retaining portion may be configured, for example, in the form of a latch lug, latch hook, or latch finger. At least one retaining portion may protrude from the outer surface of the body of the tensioning element. At least one retaining portion may be integrally formed on the body. Multiple retaining portions or at least two retaining portions may be arranged to be distributed along the circumferential direction of the body and / or offset from each other.

[0050] Multiple retaining portions or at least two retaining portions may be arranged relative to each other such that they form a guide, and the spring element may be housed in the guide in at least some portions.

[0051] According to the present invention, this objective is also achieved by a vehicle seat that includes the aforementioned longitudinal adjuster.

[0052] In summary, and in other words, in the case of the longitudinal adjuster as described above, the spindle can be pushed into the area of ​​the spindle nut in a defined manner along the radial direction. The preferred radial direction for pressing the external thread of the spindle against the internal thread of the spindle nut is oriented downward or aligned along the vertical direction (along the direction of gravity).

[0053] The cone of the damping element can be used on one side. Through wedging, the spindle can be radially pushed into the threaded teeth, particularly the trapezoidal teeth (with steep tooth surfaces), in a defined manner. In this way, free lateral backlash and / or axial backlash can be completely eliminated.

[0054] The lateral spring elements and / or tension sections of the damping module prevent loss of contact during adjustment and thus permanently prevent clicking noise from metal-to-metal contact.

[0055] For this purpose, the longitudinal adjuster can have a damping element made of plastic and held on the spindle nut. Attached Figure Description

[0056] The invention will be described in more detail below with reference to the preferred exemplary embodiments shown in the accompanying drawings. However, the invention is not limited to these exemplary embodiments. In the drawings:

[0057] Figure 1 : A vehicle seat according to the present invention is shown schematically.

[0058] Figure 2 : Showing the invention Figure 1 The vehicle seat longitudinal adjuster,

[0059] Figure 3 : Show Figure 2 A perspective view of the track pair of the longitudinal adjuster.

[0060] Figure 4 : Show Figure 3 The longitudinal section of the track pair.

[0061] Figure 5 : A perspective view of the spindle nut of the longitudinal adjuster according to the present invention is shown.

[0062] Figure 6 : Show Figure 5 A perspective view of the spindle nut, in which the spindle is screwed into the spindle nut.

[0063] Figure 7 : A perspective view showing the damping element of the longitudinal adjuster.

[0064] Figure 8 : Show Figure 7 Side view of the damping element.

[0065] Figure 9 :have Figure 6 The screw-in spindle and Figure 7 A perspective view of the spindle nut of the installed damping element.

[0066] Figure 10 Shown in perspective Figure 9 The longitudinal section of the sub-component.

[0067] Figure 11 : Show in detail Figure 10 A cross-sectional view of the end region of the damping element.

[0068] Figure 12 : Show in detail Figure 11 Enlarged detail image of XII

[0069] Figure 13 : Show in detail Figure 11 A detailed enlarged image of XIII.

[0070] Figure 14 : Show in detail Figure 11 A detailed enlarged view of XIV.

[0071] Figure 15 An exploded view schematically illustrating a spindle nut and a damping element according to another exemplary embodiment, wherein the damping element is configured as a damping module.

[0072] Figures 16 to 19 A schematic perspective view of a spindle nut with a mounted damping module is shown.

[0073] Figure 20 : Schematic illustration of the spindle nut with mounted damping module along Figure 18 The sectional view of line VI-VI in the middle.

[0074] Figure 21 : schematically showing along Figure 17 Lines VII-VI pass through the end region of the damping module in the cross-sectional view of the damping module.

[0075] Figures 22 to 24 A schematic perspective view of a spindle nut with a screw-in spindle and a mounted damping module is shown.

[0076] Figure 25 : schematically showing along Figure 23 The line IX-IX in the middle is shown in the cross-sectional view passing through the spindle nut with the screw-in spindle and the mounted damping module, and...

[0077] Figure 26 : schematically shown Figure 25Enlarged views of some parts of the cross-section. Detailed Implementation

[0078] In all the accompanying drawings, corresponding parts have the same reference numerals.

[0079] The following text describes this using three spatial directions that extend perpendicularly to each other. Figure 1 The vehicle seat 1 is schematically shown in the diagram. The longitudinal direction x extends substantially horizontally within the vehicle seat 1 and is preferably parallel to the vehicle's longitudinal direction, corresponding to the vehicle's usual direction of travel. The lateral direction y, extending perpendicular to the longitudinal direction x, is also horizontally oriented within the vehicle and extends parallel to the vehicle's lateral direction. The vertical direction z extends perpendicular to the longitudinal direction x and perpendicular to the lateral direction y. When the vehicle seat 1 is installed in the vehicle, the vertical direction z extends parallel to the vehicle's vertical axis.

[0080] The position and orientation information used, such as front, rear, top, and bottom, refers to the viewing direction of an occupant sitting in the vehicle seat 1 in a normal seated position. When the vehicle seat 1 is installed in the vehicle, it is oriented in a position suitable for passenger transport, having an upright backrest 4 facing the direction of travel, as is customary. However, the vehicle seat 1 can also be mounted in a different orientation, such as laterally to the direction of travel.

[0081] Figure 1 The vehicle seat 1 shown has a seat component 2 and a backrest 4, which can be adjusted relative to the seat component 2 according to its tilt angle. For example, the tilt angle of the backrest 4 can be adjusted by a latching accessory or a gear accessory. The vehicle seat 1 is mounted on a longitudinal adjuster 10 for adjusting the longitudinal position of the seat.

[0082] Figure 2 A longitudinal adjuster 10 for a vehicle seat 1 according to the present invention is shown. The longitudinal adjuster 10 has at least one pair of rails, in this example two pairs of rails. Figure 3 One of the track pairs of the longitudinal adjuster 10 is shown.

[0083] Each track pair is formed in each case by a first track 12, specifically for connection to the seat structure of the vehicle seat 1, and a second track 14, specifically for connection to the vehicle structure. The tracks 12, 14 of the track pair are displaced relative to each other in the longitudinal direction x and surround each other to form an internal channel 16. A spindle nut 30 fixedly and non-rotatably connected to the second track 14 and a spindle 20 operably connected to the spindle nut 30 are arranged in the internal channel 16.

[0084] Spindle 20 extends along spindle axis S, which is currently parallel to the longitudinal direction x. However, in a variation of the exemplary embodiment, spindle axis S and the track pair may also be oriented slightly tilted relative to the longitudinal direction x. The position and orientation information used, such as axial, radial, or "circumferential," refers to cylindrical coordinates relative to spindle axis S. Spindle 20 is rotatably mounted about spindle axis S.

[0085] A spindle gear mechanism 50, which can be driven by a motor 60 and drives the spindle 20, is arranged on the front end of the first track 12. The motor 60 is held on a motor mount 70, which is mounted between the two spindle gear mechanisms 50 of the corresponding track pair, and... Figure 2 The shaft (not shown) drives two main shaft gear mechanisms 50.

[0086] Figure 4 Show Figure 3 The longitudinal section of the track pair. The spindle gear mechanism 50 carries the front end portion 20a of the spindle 20. The spindle 20 has a rear end portion 20b opposite to the front end portion 20a. In the current configuration shown, the spindle nut 30 is centrally located along the length of the spindle 20. The spindle nut 30 is fixed to the second track 14 by two fixing elements 40 (in the current configuration, in the form of screws).

[0087] The retaining element 40 is guided through a corresponding opening in the second track 14. The spindle nut 30 has two retaining openings 38, both of which have internal threads and cooperate with the retaining element 40 in each case. By rotating the spindle 20 about the spindle axis S, the spindle nut 30 is screwed in along the longitudinal direction x or the opposite direction along the external threads of the spindle 20 as the direction of rotation changes. In the current case, the spindle axis S is oriented parallel to the longitudinal direction x, thereby displacing the first track 12 relative to the second track 14. Accordingly, the relative position between the spindle 20 and the spindle nut 30 is also displaced.

[0088] exist Figure 5 and Figure 6 In the diagram, the spindle nut 30 of the longitudinal adjuster 10 according to the invention is shown with and without a spindle 20. The spindle nut 30 has a body. The spindle nut 30 has a continuous threaded hole with an internal thread parallel to the longitudinal direction x. The spindle nut 30 has an opening 36 aligned with the threaded hole, specifically for the entry or exit of the spindle 20.

[0089] The internal thread 32 of the spindle nut 30 is operatively connected to the external thread of the spindle 20. The spindle nut 30 is preferably designed as a single piece. In the present case, the external thread 22 of the spindle 20 and the internal thread 32 of the spindle nut 30 are both designed as trapezoidal threads. Trapezoidal threads may have a flank clearance. Trapezoidal threads typically have a flank angle of 30°. Due to the thread geometry, trapezoidal threads with flank clearance result in a ratio between axial clearance and radial clearance having a coefficient of, for example, about 3.7.

[0090] The spindle nut 30 has a corresponding guide surface 34 in each region adjacent to the internal thread 32 in the axial direction. The guide surface 34 has an outwardly tapered shape in the axial direction, particularly an open inner tapered shape. The diameter of the opening 36 of the spindle nut 30 decreases inward along the direction of the threaded hole with the internal thread 32. Correspondingly, the diameter of the opening 36 increases outward.

[0091] In each case, the damping element 100 of the longitudinal adjuster 10 is in Figure 7 and Figure 8 As shown in the diagram. In the current configuration, the damping element 100 has two contact portions 102, which in some portions contact the main shaft 20. The two contact portions 102 of the damping element 100 are arranged at opposite ends of the damping element 100.

[0092] The contact portion 102 of the damping element 100 has at least one contact section 108 in each case, which contacts or surrounds the main shaft 20 in some portions. The contact section 108 has, for example, along a first direction R1 (in... Figure 10 (As shown in the figure) directional tension force, such as pretension force and / or spring force.

[0093] Each contact portion 102 may have multiple contact segments 108. Multiple contact segments 108 may be connected together. Preferably, a slightly flexible connector is provided in the connection area of ​​corresponding two adjacent contact segments 108. The damping element 100 is preferably made of plastic.

[0094] The damping element 100 has two spring-elastic portions 114. The spring-elastic portions 114 are connected to two contact portions 102 on both sides via connecting portions 112.

[0095] The spring elastic portion 114 may bend once or repeatedly along the longitudinal direction x, for example. In an alternative embodiment, the spring elastic portion 114 or two spring elastic portions 114 may bend once or repeatedly or extend substantially in a straight line.

[0096] Each contact segment 108 of the contact portion 102 has a contact surface 106 that contacts the external thread 22 of the spindle 20. The contact segment 108 abuts against the outer periphery of the external thread 22 of the spindle 20 using its contact surface 106.

[0097] At least one of the contact surfaces 106 may have a convex profile along the spindle axis S. Alternatively, at least one of the contact surfaces 106 may have a partially cylindrical profile along the spindle axis S. The contact surface 106 preferably extends to at least twice the thread pitch of the external thread 22 of the spindle 20.

[0098] The contact portion 102, particularly each contact section 108, has a tapered profile in the form of an outer cone 104. The outer cone 104 of the contact portion 102 contacts the lead-in surface 34 of the spindle nut 30 in the installed state.

[0099] In each case, the damping element 100 has tabs 110 on both sides of the adjacent region of the contact section 108, particularly below the contact section 108. During the installation of the damping element 100 onto the spindle nut 30, the tabs 110 serve to pre-position the damping element 100 so that the spindle 20 can subsequently be screwed in. The tabs 110 have, for example, a clamping function. The tabs 110 are configured to be substantially flexible and / or resilient. In particular, the tabs 110 are configured to be reversibly flexible. In the uninstalled state of the damping element 100, the tabs 110 have a spring force oriented away from the contact section 108 (e.g., outwardly). For pre-positioning, the tabs 110 can be clamped into the spindle nut 30. The tabs 110 secure the damping element 100 to and / or therein the spindle nut 30.

[0100] Each connecting portion 112 has a corresponding through hole for the spindle 20. The corresponding lower edge portion of the connecting portion 112 surrounds the spindle 20 in the installed state and secures the damping element 100 to prevent it from slipping off the spindle nut 30.

[0101] Figure 9 A diagram showing the mounting on the spindle nut 30 Figure 7 The damping element 100, the spindle nut has Figure 6 The screw-in spindle 20. Two spring-loaded portions 114 extend substantially parallel to the spindle axis S and, in the present case, are arranged, particularly in the transverse direction y, on one of the two opposite sides of the spindle nut 30.

[0102] The spring elastic portion 114 generates a tensile force, through which the two contact portions 102 are subjected to a first force F1 in the axial direction of the main shaft nut 30, particularly in the direction of each of the lead-in surfaces 34 (see...). Figure 12Due to material properties and / or also due to the shape of the spring elastic portion 114, the spring elastic portion 114 has its spring elastic properties.

[0103] The engagement of forces F1 and F2 in the contact section 108 of the contact portion 102 and the corresponding introduction surface 34 of the opening 36 of the spindle nut 30, and their relationship with the contact area 108 of the contact portion 102. Figure 12 The description is similar.

[0104] Figure 10 Shown by Figure 9 The longitudinal section of the subassembly consisting of the spindle nut 30, the spindle 20, and the damping element 100. In the present case, the spindle 20 is pushed downward by the outer cone 104 of the two contact portions 102, such that on each side of the spindle nut 30, the contact surface 106 of the corresponding contact portion 102 abuts against at least two threads of the spindle 20.

[0105] Figure 11 Detailed Figure 10 A cross-sectional view of the end portion of the damping element. The contact surface 106 of the contact portion 102 abutting the spindle 20 is preferably curved to allow unimpeded movement of the spindle 20.

[0106] Preferably, the spindle 20 is pushed in the direction of the weight force (gravity) acting on the spindle 20. By pushing the spindle 20 downward, the gap L between the thread flank 200 of the spindle 20 and the thread flank 300 of the spindle nut 30 (e.g., ...) is reduced. Figure 11 and Figure 14 The gap L (marked in the text) is eliminated. In particular, the gap L between the threaded sides 200 and 300 in the lower part of the spindle nut 30, especially in the lower contact area between the spindle 20 and the spindle nut 30, is eliminated.

[0107] In the upper part of the spindle nut 30, especially in the upper contact area between the spindle 20 and the spindle nut 30, a gap L can be maintained between the corresponding thread flanks 200 and 300.

[0108] In alternative or optional additional embodiments, the damping element 100 is arranged mirror-symmetrically on the spindle nut 30, for example on a horizontal plane, such that the preload of the contact section 108 is oriented upward, i.e., oriented along the second direction R2.

[0109] The first force F1 generated by the damping element 100 is designed to ensure contact between the spindle 20 and the spindle nut 30 in the lower part of the thread, even when adjusting the longitudinal position of the longitudinal adjuster 10 or the vehicle seat 1.

[0110] Figure 12 Detailed Figure 11A detailed enlarged view of XII. (See attached image.) Figure 12 As shown, the contact portion 102 cooperates with the lead-in surface 34 of the spindle nut 30 via a contour or outer cone 104. The contact portion 102 entering the opening 36 in the region of the lead-in surface 34 results in a reduction in the radial spacing A between the contact segments 108.

[0111] The corresponding contact section 108 is partially or completely arranged in the opening 36. For example, the introduced surface 34 is forced around the corresponding contact section 108.

[0112] The tapered profile of the contact portion 102 cooperates with the designated introduction surface 34 such that, in particular due to the wedge action, the first force F1 parallel to the main axis S can be deflected into a second force F2 in the radial direction onto the main axis 20.

[0113] The main shaft 20 is pushed downward by a second force F2 applied along the first direction R1.

[0114] When the spindle 20 oscillates, the change in direction of the second force F2 causes a force acting in the opposite direction to the first force F1. Damping of the vibration, particularly attenuation, is achieved through small movements along the contour of the contact portion 102 of the lead-in surface 34 of the spindle nut 30 and the resulting frictional force F3. Because the oscillation of the spindle 20 is damped radially by the damping element 100, radial impact of the external thread 22 of the spindle 20 with the internal thread 32 of the spindle nut 30 is prevented.

[0115] The spindle 20 is pushed downward by the two contact portions 102 of the damping element 100, and the thread flanks 200, 300 of the external thread 22 of the spindle 20 contact the internal thread 32 of the spindle nut 30 in the portion of the thread arranged along the first direction R1, which is the lower portion of the thread in the present case. Figure 13 by Figure 11 This is illustrated in a detailed enlarged view of detail XIII. As a result, the entire clearance between spindle 20 and spindle nut 30 is eliminated in the lower portion of the thread.

[0116] Figure 14 Detailed Figure 11 A magnified view of detail XIV. Contrary to the fact that the thread flanks 200 of the external thread 22 and the thread flanks 300 of the internal thread 32 are in complete contact at the lower part of the thread, the spacing, for example in the form of a gap L, increases accordingly in a portion of the thread (in this case, the upper part of the thread) arranged along the second direction R2 between the thread flanks 200 of the external thread 22 and the thread flanks 300 of the internal thread 32.

[0117] Figure 15An exploded view of the spindle nut 30 and damping module 13 according to a second exemplary embodiment of the longitudinal adjuster 10 is schematically shown. The damping module 13 is configured to pre-tension the spindle 20 and the spindle nut 30 relative to each other. According to another exemplary embodiment, the damping module 13 is configured as a plurality of parts and includes at least two tensioning elements 131 and optionally a spring element 132.

[0118] The spindle nut 30 has a corresponding lead-in surface 34 in adjacent regions along the axial direction within the internal thread 32. The lead-in surface 34 has an outwardly tapered shape along the axial direction, particularly an open inner tapered shape. The spindle nut 30 has a body. The spindle nut 30 has a continuous threaded hole with an internal thread 32 parallel to the longitudinal direction x. The spindle nut 30 has an opening 36 aligned with the threaded hole, specifically for the entry or exit of the spindle 20.

[0119] The diameter of the opening 36 of the spindle nut 30 decreases inward along the direction of the threaded hole with internal thread 32. Correspondingly, the diameter of the opening 36 increases outward.

[0120] The damping module 13 is configured and arranged such that the spindle 20 and the spindle nut 30 are held or can be held relative to each other in a pre-tensioned manner in the axial and / or radial directions. The damping module 13 includes two tensioning elements 131, which are respectively arranged or can be arranged at one end of the spindle nut 30 and are connected to each other in a pre-tensioned manner via a spring element 132 formed of metal, in particular, held or can be held together.

[0121] In its current configuration, the damping module 13 has two tensioning elements 131 that contact the spindle 20 in some portions. In the mounted state of the damping module 13, the tensioning elements 131 form opposite end portions of the damping module 13. The tensioning elements 131 are arranged on the front side of the spindle nut 30.

[0122] In each case, the tensioning element 131 has at least one tensioning section 133, particularly in the form of a contact section that contacts and / or partially surrounds the spindle 20. The tensioning section 133 may form, for example, a contact portion 1002 with the spindle nut 30.

[0123] The tensioning section 133 protrudes substantially vertically from the disc-shaped body of the tensioning element 131, for example. The tensioning section 133 has, for example, a tensioning force, such as a pre-tensioning force oriented in the direction R1 and / or a spring force.

[0124] Each tensioning element 131 may have multiple tensioning segments 133. Multiple tensioning segments 133 may be connected together. In the connection region between two adjacent tensioning segments 133, for example, a slightly flexible connection is provided. The damping module 13 is, for example, partially made of plastic.

[0125] The tensioning element 131 is, for example, formed of plastic and forms a separate damping component of the damping module 13. Each tensioning section 133 has a contact surface 134 that contacts the external thread 22 of the spindle 20. The tensioning section 133 abuts against the outer periphery of the external thread 22 of the spindle 20 using its contact surface 134.

[0126] At least one of the contact surfaces 134 may have a convex profile along the spindle axis S. Alternatively, at least one of the contact surfaces 134 may have a partially cylindrical profile along the spindle axis S. The contact surface 134 preferably extends at least twice the thread pitch of the external thread 22 of the spindle 20.

[0127] The tensioning section 133 has a tapered profile in the form of an outer cone. The outer cone of the tensioning section 133 contacts the lead-in surface 34 of the spindle nut 30 in the installed state.

[0128] The damping module 13 has a corresponding tab 135 in the adjacent region of the tensioning section 133, particularly on both sides below the tensioning section 133. The damping module 13 also has at least two additional tabs 136 in the region of the outer periphery of the disc-shaped body. The tabs 135 are, for example, internal tabs, particularly retaining elements. The tabs 136 are, for example, external tabs, particularly retaining elements.

[0129] The tabs 135 and 136 are used to pre-position the damping module 13 during the installation of the damping module 13 onto the spindle nut 30, so that the spindle 20 can also be screwed in subsequently.

[0130] Lugs 135 and 136 secure the damping module 13, for example, to and / or therein, the spindle nut 30. Lugs 135 and 136 have, for example, clamping and locking functions. Lugs 135 and 136 are configured to be substantially flexible and / or resilient. In particular, lugs 135 and 136 are configured to be reversibly flexible.

[0131] With the damping module 13 not installed, the inner tab 135 has a spring force oriented away from the tensioning section 133 (e.g., outward). For pre-positioning, the inner tab 135 can be clamped into the spindle nut 30.

[0132] In the uninstalled state of the damping module 13, the outer tab 136 has a spring force oriented toward the tension section 133 (e.g., inward). For pre-positioning, the outer tab 136 can be clamped against or onto the spindle nut 30.

[0133] Each tensioning element 131 has a plurality of retaining portions 137a, 137b for connecting the tensioning element 131 to the spring element 132. The retaining portions 137a, 137b are configured, for example, in the form of a latching protrusion, a latching hook, or a locking finger.

[0134] The retaining portions 137a and 137b protrude from the outer surface of the body of the tensioning element 131. In particular, the corresponding tensioning element 131 has alternating retaining portions 137a and 137b. The retaining portions 137a and 137b are arranged on the side of the tensioning element 131 opposite to the tensioning section 133.

[0135] The retaining portions 137a and 137b are arranged to be alternately offset from each other along the circumferential direction of the body. Each of the retaining portions 137a and 137b has a portion 138 connected to the body of the tensioning element 131 and a free portion 139, particularly the free end portion, which forms a receiver in one direction.

[0136] The retaining portions 137a and 137b are arranged relative to each other such that they form a guide 140 for receiving and securing the spring element 132. The retaining portions 137a and 137b have, for example, a clamping function and / or a locking function and / or a latching function.

[0137] The retaining portions 137a and 137b are configured to be substantially flexible and / or elastic. In particular, the retaining portions 137a and 137b are configured to be reversibly flexible.

[0138] In the uninstalled state of the damping module 13, the inner retaining portion 137a has an outwardly oriented spring force, for example, in a direction away from the tensioning section 133. For connection to the spring element 132, this spring element can be clamped and / or latched and / or latched into the retaining portions 137a, 137b in some portions.

[0139] When the damping module 13 is not installed, the outer retaining portion 137b has an inwardly oriented spring force, for example, along the direction of the tensioning section 133.

[0140] A metal spring element 132 extends laterally through the spindle nut 30 in the installed state. The metal spring element 132, such as a metal spring, wire, and / or worm spring, has a substantially permanent and constant pretension.

[0141] Spring element 132 has a relatively small spring constant and is therefore configured to be insensitive to tolerances. Spring element 132 is configured in a simple manner and can be manufactured cost-effectively.

[0142] The spring element 132 includes two spaced-apart support portions 141. The support portions 141 are configured in a generally U-shaped manner.

[0143] Support portions 141 are connected together via two support webs 142. Support webs 142 are connected to the two support portions 141 on opposite sides. Support webs 142 may be bent once or repeatedly along the longitudinal direction x, for example. In alternative embodiments, the support webs 142, or the two support webs 142, may be bent once or repeatedly, or extend substantially in a straight line.

[0144] Spring element 132 is configured as a single piece, for example. Support portion 141 extends substantially vertically. Support web 142 extends substantially horizontally. Support portion 141 bends substantially vertically downward from support web 142. In the mounted state of damping module 13, spring element 132 extends above spindle 20 in some portions, wherein spring element 132 deflects above spindle 20 and / or enters tensioning element 131 in some portions and is guided around spindle 20 below spindle 20.

[0145] The corresponding tensioning element 131 has a through hole 143 through which the spindle 20 is guided in the installed state. The edge portion of the through hole 143 may surround the spindle 20 in some parts.

[0146] Figures 16 to 19 A schematic perspective view of a spindle nut 30 with a mounted damping module 13 is shown. For the spindle nut 30 with the damping module 13 mounted, Figure 16 A perspective view is shown. Figure 17 Showing a side view, Figure 18 Showing the front view, Figure 19 The plan view is shown. Spring element 132 holds and pre-tensions tensioning element 131 onto spindle nut 30.

[0147] In order to connect the tensioning element 131 to the spring element 132, each tensioning element 131 has a plurality of retaining portions 137a, 137b. The retaining portions 137a, 137b are configured, for example, in the form of a latching protrusion, a latching hook, or a locking finger.

[0148] The retaining portions 137a and 137b protrude from the outer surface of the body of the tensioning element 131. In particular, the corresponding tensioning element 131 has alternating retaining portions 137a and 137b. The retaining portions 137a and 137b are arranged on the side of the tensioning element 131 opposite to the tensioning section 133.

[0149] The retaining portions 137a and 137b are arranged to be alternately offset from each other along the circumferential direction of the body. Each of the retaining portions 137a and 137b has a portion 138 connected to the body of the tensioning element 131 and a free portion 139, particularly the free end portion, which forms a receiver in one direction.

[0150] The retaining portions 137a and 137b are arranged relative to each other such that they form a guide 140 for receiving and securing the spring element 132. The retaining portions 137a and 137b have, for example, a clamping function and / or a locking function and / or a latching function.

[0151] The corresponding support portion 141 is held, in particular clamped or held in the corresponding guide 140 of the corresponding tensioning element 131 in a tensioned manner.

[0152] Figure 20 A schematic cross-sectional view of a spindle nut 30 with a mounted damping module 13 is shown. The tensioning element 131 is spaced apart from the outer surface or outer surface side of the spindle, for example, by a region arranged below the spindle 20.

[0153] The tensioning element 131 is held in a tensioned manner by a spring element 132 on the spindle nut 30. Two spring-supported webs 142 extend substantially parallel to the spindle axis S and, in the present case, are arranged, particularly in the transverse direction y, on one of two opposite sides of the spindle nut 30.

[0154] Figure 21 A cross-sectional view is schematically shown through the damping module 13 in the end region of the damping module 13, particularly in the region of the guide 140 formed by the retaining portions 137a, 137b of the tensioning elements 131.

[0155] The spring element 132 has two spaced-apart support portions 141. The support portions 141 are configured in a generally U-shape.

[0156] Support portions 141 are connected together via two support webs 142. Support webs 142 are connected to the two support portions 141 on both sides respectively. Support webs 142 may be bent once or repeatedly along the longitudinal direction x, for example. In alternative embodiments, the support webs 142, or the two support webs 142, may be bent once or repeatedly, or extend substantially in a straight line.

[0157] Spring element 132 is configured as a single piece, for example.

[0158] Figures 22 to 24 A schematic perspective view of a spindle nut 30 having a screw-in spindle 20 and a mounted damping module 13 is shown.

[0159] Figure 22 A perspective view is shown. Figure 23 Showing a side view, Figure 24 A floor plan is shown.

[0160] Figure 25 A schematic cross-sectional view is shown through a spindle nut 30 having a screw-in spindle 20 and a mounted damping module 13.

[0161] Figure 26 schematically shown Figure 25 The cross-sectional view is an enlarged view of some parts. The cone of the damping module 13 can be used on one side. The tensioning element 131 is held in a tensioned manner by a spring element 132 on the spindle nut 30. Two spring-supported webs 142 extend substantially parallel to the spindle axis S and, in the present case, are arranged, particularly in the transverse direction y, on one of the two opposite sides of the spindle nut 30.

[0162] The supporting web 142 generates tension, through which the two tensioning elements 131 are subjected to a first force F1 in the axial direction of the main shaft nut 30, and in particular in the direction of each of the lead-in surfaces 34.

[0163] The contact surface 106 of the tensioning section 134 abuts against the outer periphery of the external thread 22 of the spindle 20. The outer cone of the tensioning section 133, which is formed opposite to the contact surface 134, abuts against the inner cone of the lead-in surface 34 of the spindle nut 30.

[0164] Through this wedging action, the spindle 20 can be pushed radially into the threaded teeth, particularly the trapezoidal teeth (with steep tooth surfaces), in a defined manner. In this way, free lateral clearance and axial clearance can be completely eliminated.

[0165] The tensioning element 131 can prevent loss of contact during the adjustment process and vehicle operation, and thus permanently prevents clicking noise from metal-to-metal contact.

[0166] In the current situation, the spindle 20 is pushed downward by the outer cones of the two tensioning elements 131, such that on each side of the spindle nut 30, the contact surface 134 of the corresponding tensioning element 131 abuts against at least two threads of the spindle 20.

[0167] The contact surface 134 abutting against the spindle 20 is, for example, curved, in order to allow unimpeded movement of the spindle 20.

[0168] The corresponding tensioning element 133 is partially or completely arranged in the opening 36. For example, the introduced surface 34 is forcibly placed around the corresponding tensioning element 133.

[0169] The features disclosed in the above description and figures may be important for implementing the invention individually and in combination in its various embodiments.

[0170] While the invention has been described in detail with reference to the accompanying drawings and the foregoing description, the drawings should be understood as illustrative and exemplary rather than limiting. In particular, the choice of scale for individual elements shown in the drawings should not be interpreted as necessary or limiting. The invention is not limited to the exemplary embodiments described. Further variations and embodiments of the invention will be found by those skilled in the art in the foregoing disclosure and drawings.

[0171] Terms such as “comprising,” “having,” “including,” and “containing” used in this invention do not exclude other elements or steps. The use of indefinite articles does not exclude their plural forms. A single device can perform the functions of multiple units or multiple devices described in this invention.

[0172] List of reference numerals

[0173] 1. Vehicle Seats

[0174] 2 Seat components

[0175] 4. Backrest

[0176] 10. Longitudinal Adjuster

[0177] 12 First Track

[0178] 14 Second Track

[0179] 13 Damping Module

[0180] 16 Internal passageways

[0181] 20 spindles

[0182] 20a Front-end section

[0183] 20b Backend

[0184] 22 External thread

[0185] 30 Spindle Nut

[0186] 32 Internal Thread

[0187] 34. Introducing a surface

[0188] 36 Opening

[0189] 38 Fixed opening

[0190] 40 Fixing elements

[0191] 50 Main shaft gear mechanism

[0192] 60 motors

[0193] 70 Motor mounting hardware

[0194] 100 damping element

[0195] 102, 1002 contact parts

[0196] 104 outer cone

[0197] 106 Contact Surface

[0198] 108 Contact Section

[0199] 110 protrusions

[0200] 112 Connection part

[0201] 114 Spring elastic part

[0202] 131 tensioning element

[0203] 132 Spring element

[0204] 133 tension section

[0205] 134 Contact Surface

[0206] 135, 136 protrusions

[0207] 137a, 137b Retention Section

[0208] Parts 138 and 139

[0209] 140 Guide

[0210] 141 Supporting Part

[0211] 142 Supporting web

[0212] 143 Through Hole

[0213] 200, 300 thread flank

[0214] A Spacing

[0215] L-gap

[0216] F1 First Force

[0217] F2 Second Force

[0218] F3 Friction

[0219] R1 First Direction

[0220] R2 Second Direction

[0221] S (spindle 20) spindle axis

[0222] x Vertical direction

[0223] y (horizontal direction)

[0224] z Vertical direction

Claims

1. A longitudinal adjuster (10) for a seat, the longitudinal adjuster (10) comprising: At least one track pair, the at least one track pair being formed by a first track (12) and a second track (14), wherein the first track (12) and the second track (14) form an internal channel (16) and the first track (12) is capable of shifting relative to the second track (14) in the longitudinal direction (x); A spindle nut (30) is connected to the second track (14), and the spindle nut (30) is arranged in the internal channel (16); A spindle (20) having an internal thread (32) cooperating with the internal thread (32) of the spindle nut (30) and having an external thread (22) is arranged in the internal channel (16); A spindle gear mechanism (50), which can be driven by a motor (60) and cooperates with the spindle (20), is arranged on the end of the first track (12); and A damping element (100) or damping module (13) is configured and arranged such that the spindle (20) and the spindle nut (30) are held relative to each other in a pre-tensioned manner in the axial direction and the radial direction of the spindle. The spindle nut (30) has a corresponding lead-in surface (34) in each region adjacent to the internal thread (32) in the axial direction. The damping element (100) or the damping module (13) has at least one contact portion, the at least one contact portion having contact surfaces (106, 134) that contact the spindle (20) at least in some portions, and the contact surfaces (106, 134) contact the external thread (22) of the spindle (20). The contact portion has a tapered profile in the form of an outer cone (104), wherein, in the installed state, the outer cone (104) of the contact portion contacts the lead-in surface (34) of the spindle nut (30).

2. The longitudinal adjuster (10) as claimed in claim 1, wherein, The damping element (100) or the damping module (13) is configured to pretension the spindle (20) radially relative to the internal thread (32) of the spindle nut (30) in a first direction (R1) such that the thread flank of the external thread (22) is pushed against the thread flank of the internal thread (32).

3. The longitudinal adjuster (10) as described in claim 2, wherein, The radial spacing between the thread flanks of the external thread (22) and the thread flanks of the internal thread (32) increases along a second direction (R2) opposite to the first direction (R1).

4. The longitudinal adjuster (10) as described in any one of claims 1 to 3, wherein, The spindle nut (30) has an introduction surface (34) in at least one region adjacent to the internal thread (32) along the axial direction.

5. The longitudinal adjuster (10) as claimed in claim 1, wherein, The contact surfaces (106, 134) have a convex profile extending along the axis (S) of the main shaft.

6. The longitudinal adjuster (10) as claimed in claim 1, comprising a damping element, wherein, The damping element (100) is configured as a single piece and has at least two spring-elastic portions (114) that subject the at least one contact portion to a first force (F1) in the direction of the spindle nut (30).

7. The longitudinal adjuster (10) as claimed in claim 1, comprising a damping module, wherein, The damping module (13) includes two tensioning elements (131), each of which is disposed at one end of the spindle nut (30) and held relative to each other in a pre-tensioned manner via at least one spring element (132).

8. The longitudinal adjuster (10) as claimed in claim 7, wherein, Each corresponding tensioning element (131) includes at least one flexible retaining portion (137a, 137b) connected to the spring element (132).

9. The longitudinal adjuster (10) as claimed in claim 7 or 8, wherein, The spring element (132) includes at least two support portions (141) spaced apart from each other for connection to a corresponding tensioning element (131), and at least one support web (142) connecting the support portions (141).

10. The longitudinal adjuster (10) as claimed in claim 7 or 8, wherein, The threaded sides of the spindle nut (30) and the threaded sides of the spindle (20) are held relative to each other in a pre-tensioned manner by the damping module (13), so that they are held relative to each other without gaps.

11. The longitudinal adjuster (10) as claimed in claim 7 or 8, wherein, The tensioning element (131) is in contact with the spindle (20) at least in some portions.

12. The longitudinal adjuster (10) as claimed in claim 7 or 8, wherein, The tensioning elements (131) are arranged such that they form opposite end portions of the damping module (13).

13. The longitudinal adjuster (10) as claimed in claim 7 or 8, wherein, The damping module (13) also has a spring element (132) that connects the two tensioning elements (131) together.

14. The longitudinal adjuster (10) as claimed in claim 1, which is a longitudinal adjuster (10) for a vehicle seat (1).

15. A vehicle seat (1) comprising a longitudinal adjuster (10) as claimed in any one of claims 1-14.

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