Longitudinal adjuster, method of assembling a longitudinal adjuster, and vehicle seat

Abstract

The invention relates to a longitudinal adjuster (10) having at least one pair of tracks formed by a first track (12) and a second track (14), wherein: the first track and the second track are displaceable relative to one another; the first track and the second track enclose one another fixed to form an inner duct (16); in the inner duct there is provided a spindle nut (30) connected to the second track and a spindle (20) operably connected to the spindle nut; the spindle nut is fixed to the second track by means of a first fixing element (40a) and a second fixing element (40b); the spindle nut is centered by means of the two fixing elements perpendicular to the longitudinal extent of the second track, in particular in the transverse direction (y), wherein the first fixing element is fixed relative to a first through-hole (14a) and the second fixing element is fixed relative to a second through-hole (14b). The application also relates to a method for assembling a longitudinal adjuster and to a vehicle seat (1) having such a longitudinal adjuster.

Description

Technical Field

[0001] This invention relates to a longitudinal adjuster having at least one pair of tracks formed by a first track and a second track, wherein the first track and the second track are displaceable relative to each other, particularly in the longitudinal direction, wherein the first track and the second track alternately surround each other when forming an internal channel, wherein a spindle nut connected to the second track is disposed in the internal channel, and a spindle operably connected to the spindle nut is disposed therein; wherein a spindle driver is disposed on the first track, which is capable of being driven by a motor and interacting with the spindle, and wherein the spindle nut is fixed to the second track by a first fixing element and a second fixing element. The invention also relates to a method for assembling such a longitudinal adjuster and a vehicle seat. Background Technology

[0002] A universal longitudinal adjuster for a vehicle seat is known from DE 10 2017 218 492 A1. This longitudinal adjuster has at least one pair of tracks formed by a first seat track and a second seat track, the second seat track being longitudinally displaceable relative to the first seat track. The seat tracks alternately surround each other when forming an internal channel. A spindle nut mounted via the second seat track is disposed within the internal channel, and a spindle operably connected to the spindle nut is disposed therein. A gearbox capable of being driven by a motor and interacting with the spindle is disposed at the front end of the first seat track. The spindle on the front end section of the spindle is mounted in the gearbox, and the spindle on the rear end section of the spindle is mounted in a rotary bearing of the first seat track. The spindle nut is secured to the second track by two fixing elements.

[0003] A drive mechanism for a motor vehicle seat in a sliding device is known from DE 10 2005 023 095 A1. The drive mechanism for a motor vehicle seat sliding device includes a mating, fixed track component and a movable track component movable between a front position and a rear position. The drive mechanism includes an extended spindle, a spindle nut, a gearbox, and a mounting 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 gearbox can be mounted on a corresponding other track component and selectively rotates the spindle about the spindle axis. The spindle of the drive mechanism is provided with a spindle wheel, which, in the assembled state of the drive mechanism, extends outward through a spindle wheel opening in the movable track component.

[0004] A seat sliding device is known from DE 10 2006 000 193 A1, which has a system with a floating threaded spindle and a fixed nut. The nut is fastened to a lower track, and as the nut rotates, the threaded spindle allows the upper structure to move forward and backward. Once the system is applied, the nut is firmly fixed to the lower track.

[0005] A longitudinal adjuster is known from DE 10 2019 122 928 B3, which has at least one pair of tracks formed by a second track and a first track, the first track being displaceable relative to the second track in the longitudinal direction, wherein the tracks alternately surround each other when forming an internal channel, wherein a spindle nut mounted via the second track is disposed in the internal channel, and a spindle operably connected to the spindle nut is disposed therein, wherein a gearbox is disposed at a first end of the track, which is capable of being driven by a motor and interacting with the spindle. The spindle nut is connected to the second track by two anti-collision pins, wherein in each case, a circumferential gap is provided between each anti-collision pin and the second track.

[0006] A sliding mechanism for an electric seat is known from JP 2008-56 003A, comprising a lower rail and an upper rail, wherein the upper rail is displaceable relative to the lower rail, a main shaft rotatably mounted on the inner side of the upper rail, and a nut element screwed onto the main shaft and secured to the lower rail by two bolts. The two bolts are disposed in two through holes configured on the lower rail, wherein a bolt gap is provided between the bolt and the corresponding inner circumferential surface of the through hole.

[0007] A spindle / bearing assembly for a seat longitudinal gear mechanism is known from DE 10 2008 024 141 A1. This assembly has a housing capable of being fastened to a vehicle component or a seat component by means of a fastening assembly. A spindle opening allows a spindle to pass through along an axis extending through the housing. An internal thread within the housing, in the region of the spindle opening, engages the spindle passing through in this manner and is configured to adjust the relationship between the housing and the spindle relative to each other along the axis of the spindle opening. The spindle / bearing assembly specifies that the internal thread is configured in a spindle nut, and the spindle nut is mounted in the housing and thus adjustable relative to the axis of the spindle opening.

[0008] Purpose of the invention

[0009] The object of this invention is to improve the type of longitudinal adjuster described at the beginning, and in particular to provide a longitudinal adjuster in which the main shaft nut can be easily positioned and assembled. Furthermore, a fundamental object is to provide a corresponding method for assembling the longitudinal adjuster, and a corresponding vehicle seat. Summary of the Invention

[0010] According to the invention, this objective is achieved by a longitudinal adjuster having at least a pair of tracks formed by a first track and a second track, wherein the first track and the second track are displaceable relative to each other, particularly in the longitudinal direction, wherein the first track and the second track alternately surround each other when forming an internal channel, wherein a spindle nut connected to the second track and a spindle operably connected to the spindle nut are disposed in the internal channel; wherein a spindle driver is disposed on the first track, which is capable of being driven by a motor and interacting with the spindle, wherein the spindle nut is fixed to the second track by a first fixing element and a second fixing element. The spindle nut is centered perpendicular to the longitudinal range of the second track by the two fixing elements, particularly in the transverse direction, wherein the first fixing element is fixed relative to a first through hole, and the second fixing element is fixed relative to a second through hole.

[0011] Since the spindle nut is centered in the longitudinal range of the second track by one of two fixing elements, particularly in the transverse direction, wherein the first fixing element is fixed relative to the first through hole and the second fixing element is fixed relative to the second through hole, production-related tolerances can be easily compensated by simple means when the spindle nut is positioned and aligned relative to the second track.

[0012] The longitudinal range of the second track preferably extends parallel to the longitudinal direction. The main shaft nut is preferably centered in the lateral direction by two fixing elements. The main shaft nut is preferably centered horizontally by two fixing elements. Assuming the vehicle moves on a horizontal plane, the longitudinal adjuster in the vehicle is preferably located in the horizontal plane in the lateral direction of intended use.

[0013] 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 structural components. Possible structures and functions of spindle drives are known, for example, from DE 10 2013 207 665 A1, the disclosure of which is explicitly incorporated herein by reference.

[0014] The spindle on the front end section of the spindle can be installed in the spindle drive and / or the spindle on the rear end section of the spindle can be installed in the rotary bearing of the first track.

[0015] The spindle nut may have a body. The spindle nut may have a continuous threaded hole with internal threads, particularly parallel to the longitudinal direction. The internal threads of the spindle nut can be operatively connected to the external threads of the spindle. The spindle is preferably screwed into the spindle nut. The spindle nut is preferably a one-piece design.

[0016] Each of these two fixing elements may have a shank with external threads and a head section. The two fixing elements between the shank and the head section preferably have a cone in the transition area between the shank and the head section.

[0017] The first through-hole may have a generally square cross-section with rounded corners. "Generally square" in the context of this invention is understood to mean that there may be only a minute difference of at most 1 mm between the length and width of the cross-section, aside from manufacturing tolerances, and particularly a minute difference of at most 0.5 mm. The length is preferably measured in the longitudinal direction, and the width is preferably measured in the transverse direction.

[0018] The second through-hole may have a generally rectangular cross-section with rounded corners. "Generally rectangular" in the context of this invention is understood to mean a minute difference of at most 1 mm between the length and width of the cross-section, excluding manufacturing tolerances, and particularly a minute difference of at most 1.5 mm, excluding manufacturing tolerances. Here, the length is preferably measured in the longitudinal direction, and the width is preferably measured in the transverse direction.

[0019] Two through holes perpendicular to the longitudinal range of the second track, particularly in the transverse direction, may have the same dimensions. The dimension of the first through hole parallel to the longitudinal range of the second track can be designed to deviate from the dimension of the second through hole parallel to the longitudinal range of the second track. Parallel to the longitudinal range is understood to specifically refer to the direction within the longitudinal range.

[0020] The cone of the corresponding fixing element in the region adjacent to the corresponding head section may have a diameter, especially a maximum diameter, which is slightly larger than the size of the corresponding through hole in the longitudinal range perpendicular to the second track, especially in the transverse direction.

[0021] The dimension of the second through hole in the longitudinal direction of the second track can be larger than the diameter, particularly the maximum diameter, of the cone of the second fixing element. In the assembled state, a gap may exist between at least one peripheral segment of the cone of the second fixing element and the second through hole in the longitudinal direction of the second track before and / or after the fixing element. The second fixing element may have a gap in the second through hole parallel to the longitudinal direction of the second track.

[0022] For connection to a fixing element, the spindle nut may in every case have a fixing opening. The inner diameter of the fixing opening is preferably adapted to the outer diameter of the fixing device. The fixing device can be a screw. The fixing device can be a bolt, particularly a threaded bolt.

[0023] A buffer can be disposed between the spindle nut, particularly the body of the spindle nut, and the second rail. The buffer preferably has a flat design. The buffer can be made of plastic material, particularly rubber. The buffer can be made of metal. One side of the buffer can be made of metal, and the other side can be made of plastic material or rubber. Here, one side of the buffer can be made of metal, and the other side of the buffer can be made of plastic material and / or rubber.

[0024] According to the present invention, this objective is further achieved by a method for assembling a longitudinal adjuster, particularly a longitudinal adjuster as described above, the method comprising the following steps:

[0025] a) Provide a second track, wherein the second track for fastening the spindle nut has a first through hole and a second through hole;

[0026] b) Install the spindle nut on the second track;

[0027] c) Insert, in particular screw in, the first fixing element from the side of the second track away from the spindle nut, through the first through hole into the spindle nut;

[0028] d) Insert, specifically screw in, the second fixing element from the side of the second track away from the spindle nut, through the second through hole into the spindle nut;

[0029] In the transition zone between the handle and the head section, at least one of the two fixing elements has a cone, wherein when the fixing element is inserted into the designated through hole, at least one fixing element self-centers by the cone, particularly in the transverse direction, and the cone of the fixing element deforms the contact edge of the peripheral area of ​​the designated through hole, particularly for fixing in the centered position.

[0030] Each of the two retaining elements in the transition zone between the handle and the head section preferably has a cone. The two retaining elements may have the same design.

[0031] The placement of the spindle nut on the second rail can occur simultaneously with the placement of a buffer between them. The buffer preferably has a flat design. The buffer can be made of plastic material, particularly rubber. The buffer can be made of metal. The buffer can be made of metal on one side and plastic or rubber on the other. Here, one side of the buffer can be made of metal, and the other side can be made of plastic and / or rubber.

[0032] When the first fixing element is inserted into the first through hole, the first fixing element can self-center within the first through hole by means of the cone, being both parallel and perpendicular to the longitudinal range of the second track, particularly in the transverse direction. When the second fixing element is inserted into the second through hole, the second fixing element can self-center within the second through hole by means of the cone, preferably being completely perpendicular to the longitudinal range of the second track, particularly in the transverse direction.

[0033] According to the present invention, this objective is further achieved by a vehicle seat having the longitudinal adjuster described above.

[0034] In summary, in other words, in the prior art, the fastening of the spindle nut and the lower rail is typically performed using two to three screws. The fastening holes of these screws in the lower rail are larger in diameter than the screw shank to compensate for tolerances and ensure clean support for the screw heads. However, as a result, during screw assembly, the spindle nut must be actively aligned within the lower rail via an additional receiving portion.

[0035] According to the invention, the screw used for fastening the spindle nut may have a taper between the screw head and the shank of the respective screw. This taper is preferably conceived to center the screw across all tolerances and the corresponding through-hole of the lower track in the lateral direction.

[0036] To allow the screw to be tightened to the point where force begins to be applied, the through-hole can be designed so that the taper contacts the peripheral area of ​​the through-hole in the lower rail only through a small contact surface, particularly in narrow sections. This can be achieved using a rectangular hole that has almost the same dimension in the longitudinal direction as it does in the transverse direction of the lower rail. A second rectangular hole has a narrower dimension in the transverse direction of the lower rail and a slightly larger dimension in the longitudinal direction. As a result, the second rectangular hole has a clearance in the longitudinal direction to compensate for longitudinal tolerances. Due to the smaller contact surface, the taper of the screw can deform the contact edge in the through-hole, and the head face of the screw is firmly supported thereon. Attached Figure Description

[0037] The invention will now be explained in more detail with reference to the advantageous exemplary embodiments shown in the accompanying drawings. However, the invention is not limited to these embodiments. In the drawings:

[0038] Figure 1 A vehicle seat according to the invention is shown;

[0039] Figure 2 Showing according to Figure 1 A perspective view of the longitudinal adjuster of the present invention for a vehicle seat;

[0040] Figure 3 Show Figure 2A perspective view of a pair of tracks for the longitudinal adjuster in the middle;

[0041] Figure 4 Show Figure 3 The longitudinal section of a pair of tracks;

[0042] Figure 5 Show Figure 3 A fragment of an exploded diagram of a pair of tracks, showing the second track, buffer, spindle nut, and two fixing elements;

[0043] Figure 6 A partial cross-sectional view of the fixing element set in the second track, as seen from above;

[0044] Figure 7 Show Figure 3 A cross-sectional view of the main shaft nuts of a pair of rails; and

[0045] Figure 8 Show Figure 4 The illustration shows an enlarged segment of the spindle nut area. Detailed Implementation

[0046] The following text will use three mutually perpendicular spatial directions to describe Figure 1 The vehicle seat 1 is schematically shown in the diagram. In the vehicle seat 1 installed in a vehicle, the longitudinal direction x extends substantially horizontally and is preferably parallel to the longitudinal direction of the vehicle, which corresponds to the vehicle's usual direction of travel. The lateral direction y extends perpendicular to the longitudinal direction x, is also horizontally aligned, and extends parallel to the lateral direction of the vehicle. The vertical direction z extends perpendicular to the longitudinal direction x and perpendicular to the lateral direction y. In the vehicle seat 1 installed in a vehicle, the vertical direction z extends parallel to the vehicle's vertical axis. The longitudinal direction x and the lateral direction y may define a horizontal plane.

[0047] The position and direction indicators used, such as front, rear, top, and bottom, are relative to the viewing direction of a passenger in the assumed normal seating position of vehicle seat 1, wherein, when vehicle seat 1 is installed in the vehicle, it is aligned in a position suitable for transporting personnel, has a backrest 4, and is in the same direction of travel as usual. However, vehicle seat 1 may also be installed in a position deviating from its alignment, for example, laterally to the direction of travel.

[0048] Figure 1 The vehicle seat 1 shown for a motor vehicle has a seat component 2 and a backrest 4, the backrest's angle relative to the seat component 2 being adjustable. For example, the angle of the backrest 4 can be adjusted by a latching mechanism or a gearbox mechanism. To adjust the longitudinal position of the seat, the vehicle seat 1 is mounted on a longitudinal adjuster 10.

[0049] Figure 2A 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, currently two pairs of rails. Figure 3 One of the pairs of tracks of the longitudinal adjuster 10 is shown.

[0050] The track pair is formed in each case by a first track 12, specifically for connecting to the seat structure of the vehicle seat 1, and a second track 14, specifically for connecting to the vehicle structural components. The tracks 12 and 14 in this pair are displaceable relative to each other in the longitudinal direction x, and alternately surround each other when forming the internal conduit 16. A spindle nut 30 is provided in the internal conduit 16, which is mounted on the second track 14 and is currently rotatably fixed thereon, and a spindle 20 is provided, operably connected to the spindle nut 30. The spindle 20 extends along the spindle axis S, thus being parallel to the longitudinal direction x. A spindle driver 70 is provided at the front end of the first track 12, which is capable of being driven by a motor 80 and driving the spindle 20. The motor 80 is held on a motor support 90, which is assembled between the two spindle drivers 70 of each pair of tracks, and is connected by means of a motor support 90. Figure 2 The shank shown in the figure drives two spindle drives 70.

[0051] Figure 4 Show Figure 3 The spindle nut 30 is a longitudinal section of a pair of tracks. The spindle driver 70 mounts the front end section 20a of the spindle 20. In the currently shown configuration, the spindle nut 30 is centered along the length of the spindle 20. By rotating the spindle 20 about its axis S, the spindle nut 30 is driven along the external thread of the spindle 20 in the longitudinal direction x or the opposite direction, resulting in displacement of the first track 12 relative to the second track 14. During this process, the relative position of the spindle 10 and the spindle nut 30 also shifts accordingly. The spindle nut 30, parallel to the longitudinal direction x, has a continuous threaded hole with an internal thread 32. The internal thread 32 of the spindle nut 30 is operably connected to the external thread of the spindle 20. The spindle nut 30 is currently a single-piece design.

[0052] Figures 5 to 8 Various views of the second track 14, which has a buffer 60, a spindle nut 30, and two fixing elements 40a and 40b, are shown.

[0053] The spindle nut 30 is currently a one-piece design. The spindle nut 30 is fastened to the second track 14 by two fixing elements 40a and 40b. The spindle nut 30 is centered perpendicular to the longitudinal direction of the second track 14 by the two fixing elements 40a and 40b relative to the corresponding through holes 14a and 14b of the second track 14, specifically the first through hole 14a and the second through hole 14b. If the longitudinal direction of the second track 14 extends parallel to the longitudinal direction x, then the spindle nut 30 is horizontally centered by the two fixing elements 40a and 40b. The spindle nut 30 is centered, particularly in the transverse direction y, by the two fixing elements 40a and 40b.

[0054] The spindle nut 30 has a fixing opening 34 for each fixing element 40a, 40b. A buffer 60 is disposed between the second rail 14 and the spindle nut 30. For each of the two fixing elements 40a, 40b, the buffer 60 has a through hole in each case. In the assembled state, the peripheral area of ​​the through hole of the buffer 60 does not necessarily contact the fixing elements 40a, 40b.

[0055] The first fixing element 40a and the second fixing element 40b are currently screws. The first fixing element 40a and the second fixing element 40b are identical components. Each of the two fixing elements 40a and 40b has a cone 46 in the transition area between the shank 42 and the head section 44. The shank 42 of each of the fixing elements 40a and 40b currently has external threads.

[0056] The first through-hole 14a, particularly before the assembly of the spindle nut 30 and the first fixing element 40a, has a generally square cross-section with rounded corners. The first fixing element 40a is disposed in the first through-hole 14a. Before the assembly of the spindle nut 30 and the first fixing element 40a, the dimension of the first through-hole 14a, perpendicular to the longitudinal direction of the second track 14, particularly in the transverse direction y, is designed to be slightly smaller than the maximum diameter of the cone 46 of the first fixing element 40a in the region adjacent to the head section 44 of the first fixing element 40a. In the state before the assembly of the first fixing element 40a, the dimension of the first through-hole 14a, parallel to the longitudinal direction of the second track 14, is the same as the dimension of the first through-hole 14a, perpendicular to the longitudinal direction of the second track 14, particularly in the transverse direction y.

[0057] During the assembly of the spindle nut 30 and the first fixing element 40a, the cone 46 of the first fixing element 40a causes slight deformation of the peripheral area of ​​the first through hole 14a that contacts the cone 46. When the first fixing element 40a is fully assembled, the peripheral area of ​​the first through hole 14a that contacts the cone 46 deforms due to the displacement of the cone 46. This deformation causes the cone 46 of the first fixing element 40a to begin to firmly support itself on the peripheral area of ​​the first through hole 14a, and the head section 44 of the first fixing element 40a to begin to firmly support itself on the second track 14.

[0058] The second through-hole 14b has a generally rectangular cross-section with rounded corners. A second fixing element 40b is disposed within the second through-hole 14b. Before assembling the spindle nut 30 and the second fixing element 40b, the dimension of the second through-hole 14b perpendicular to the longitudinal direction of the second track 14, particularly in the transverse direction y, is designed to be slightly smaller than the maximum diameter of the taper 46 of the second fixing element 40b in the region adjacent to the head segment 44 of the second fixing element 40b. The dimension of the second through-hole 14b parallel to the longitudinal direction of the second track 14 is larger than the maximum diameter of the taper 46 of the second fixing element 40b.

[0059] A gap is provided between the peripheral areas of the second fixing element 40b and the second through hole 14b, extending parallel to the longitudinal extension of the second track 14.

[0060] During the assembly of the spindle nut 30 and the second fixing element 40b, a slight deformation occurs in the peripheral area of ​​the second through hole 14b that contacts the cone 46. Specifically, the peripheral area of ​​the second through hole 14b, which is laterally positioned and parallel to the longitudinal direction of the second track 14, experiences slight deformation upon contact with the cone 46 of the second fixing element 40b. With the second fixing element 40b fully assembled, the peripheral area of ​​the second through hole 14b that contacts the cone 46 is deformed due to the displacement of the cone 46, causing the cone 46 of the second fixing element 40b to align and center between the relative peripheral areas of the contacting second through hole 14b. The head section 44 of the second fixing element 40b then begins to firmly support itself on the second track 14.

[0061] In order to implement the invention in its various design embodiments, the features disclosed in the above description, claims and drawings are important, whether individually or in combination.

[0062] List of reference numerals

[0063] 1 Vehicle Seat

[0064] 2 Seat Components

[0065] 4 backrests

[0066] 10 longitudinal adjusters

[0067] 12 First Track

[0068] 14 Second Track

[0069] 14a First Through Hole

[0070] 14b Second Through Hole

[0071] 16 Internal Piping

[0072] 20 spindles

[0073] 20a (the front end section of spindle 20)

[0074] 20b (rear end section of spindle 20)

[0075] 30 spindle nut

[0076] 32 internal thread

[0077] 34 Fixed openings

[0078] 40a First fixed element

[0079] 40b Second fixing element

[0080] 42 handle

[0081] 44 head segments

[0082] 46 cones

[0083] 60 buffer

[0084] 70 spindle drive

[0085] 80 motor

[0086] 90 motor support

[0087] S (spindle 20) spindle axis

[0088] x longitudinal direction

[0089] y-direction

[0090] z is the vertical direction.

Claims

1. A length adjuster (10) having at least one pair of tracks formed by a first track (12) and a second track (14), wherein, The first track (12) and the second track (14) are displaceable relative to each other, wherein the first track (12) and the second track (14) form an internal conduit (16), wherein the internal conduit (16) includes a spindle nut (30) connected to the second track (14), and a spindle (20) operably connected to the spindle nut (30); wherein the first track (12) includes a spindle driver (70) capable of being driven by a motor (80) and interacting with the spindle (20), wherein the spindle nut (30) is fixed to the second track (14) by a first fixing element (40a) and a second fixing element (40b), characterized in that, The spindle nut (30) is centered in the longitudinal range of the second track (14) in the transverse direction, perpendicular to the longitudinal direction, by means of the first fixing element (40a) and the second fixing element (40b), wherein the first fixing element (40a) is fixed relative to the first through hole (14a) in the second track (14), and the second fixing element (40b) is fixed relative to the second through hole (14b) in the second track (14), and Wherein, the first fixing element (40a) relative to the first through hole (14a) and the second fixing element (40b) relative to the second through hole (14b) are centered in the longitudinal range perpendicular to the second track (14). The first fixing element (40a) and the second fixing element (40b) each have a threaded shank (42) and a head section (44), wherein a cone (46) is provided in each case in the transition area between the shank (42) and the head section (44), and wherein the first fixing element (40a) and the second fixing element (40b) have the same size and shape. The first through hole (14a) has a different shape in the longitudinal direction than the second through hole (14b). Although the first through hole (14a) and the second through hole (14b) have different shapes compared to each other, each cone (46) centers the first fixing element (40a) and the second fixing element (40b) laterally within the first through hole (14a) and the second through hole (14b). Wherein, the cones (46) of the first fixing element (40a) and the second fixing element (40b) deform the first and second lateral contact edges of the peripheral areas of the first through hole (14a) and the second through hole (14b). Wherein, at least one longitudinal gap is provided between the cone (46) of the second fixing element (40b) and the longitudinal contact edge of the second through hole (14b) to provide longitudinal tolerance of the spindle nut (30) relative to the second track (14).

2. The length adjuster (10) according to claim 1, wherein The first through hole (14a) has a generally square cross-section with rounded corners.

3. The length adjuster (10) according to claim 1 or 2, wherein The second through hole (14b) has a generally rectangular cross-section with rounded corners.

4. The length adjuster (10) according to claim 1 or 2, wherein The dimensions of the first through hole (14a) and the second through hole (14b) in the longitudinal range perpendicular to the second track (14) are the same.

5. The length adjuster (10) according to claim 2, wherein, The cones (46) of the first fixing element (40a) and the second fixing element (40b) have diameters in the regions adjacent to the respective head segments (44), wherein, prior to the assembly of the first fixing element (40a) and the second fixing element (40b), the dimensions of the longitudinal extent of the first through hole (14a) and the second through hole (14b) perpendicular to the second track (14) are smaller than the diameter of the cones (46).

6. The longitudinal adjuster (10) according to claim 2, wherein, The dimension of the second through hole (14b) in the longitudinal direction of the second track (14) is greater than the diameter of the cone (46) of the second fixing element (40b).

7. The longitudinal adjuster (10) according to claim 1 or 2, wherein, The buffer (60) is disposed between the second track (14) and the spindle nut (30).

8. The longitudinal adjuster (10) according to claim 1 or 2, wherein, The first track (12) and the second track (14) are displaceable relative to each other in the longitudinal direction (x).

9. The longitudinal adjuster (10) according to claim 4, wherein, The dimensions of the first through hole (14a) and the second through hole (14b) are measured in the transverse direction (y).

10. The longitudinal adjuster (10) according to claim 5, wherein, The dimensions of the first through hole (14a) and the second through hole (14b) are measured in the transverse direction (y).

11. A method for assembling a longitudinal adjuster (10), the method comprising the following steps: a) Provide a second orbital (14), wherein, The second track (14) for fastening the spindle nut (30) has a first through hole (14a) and a second through hole (14b). b) Set the spindle nut (30) on the second track (14); c) Insert the first fixing element (40a) from the side of the second track (14) away from the main spindle nut (30) and enter the main spindle nut (30) through the first through hole (14a); d) Insert the second fixing element (40b) from the side of the second track (14) opposite to the spindle nut (30), and enter the spindle nut (30) through the second through hole (14b). Its features are, The first fixing element (40a) and the second fixing element (40b) have a shank (42) with external threads and a head section (44), wherein the transition area between the shank (42) and the head section (44) has a cone (46) in each case, wherein the first fixing element (40a) and the second fixing element (40b) have the same size and shape, wherein when the first fixing element (40a) and the second fixing element (40b) are inserted into the first through hole (14a) and the second through hole (14b), the first fixing element (40a) and the second fixing element (40b) self-center to a central position perpendicular to the longitudinal range of the second track (14) by the cone (46), wherein the first through hole (14a) has a longitudinal direction with the second through hole (14b) 4b) Different shapes, wherein, although the first through hole (14a) and the second through hole (14b) have different shapes compared to each other, each cone (46) in the first through hole (14a) and the second through hole (14b) centers the first fixing element (40a) and the second fixing element (40b) in the lateral direction, wherein the cone (46) of the first fixing element (40a) and the second fixing element (40b) deforms the first lateral contact edge and the second lateral contact edge of the peripheral region of the first through hole (14a) and the second through hole (14b), wherein at least one longitudinal gap is provided between the cone (46) of the second fixing element (40b) and the longitudinal contact edge of the second through hole (14b) to provide longitudinal tolerance of the spindle nut (30) relative to the second track (14).

12. The method according to claim 11, wherein, The insertion of the first fixing element (40a) and / or the second fixing element (40b) includes screwing it into the spindle nut (30).

13. A vehicle seat (1) having a longitudinal adjuster (10) according to any one of claims 1 to 10.

14. The vehicle seat (1) according to claim 13, wherein, The longitudinal adjuster (10) is assembled according to the method of claim 11 or 12.

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