Longitudinal adjustment device and vehicle seat

Abstract

The invention relates to a longitudinal adjustment device (110) for a seat, in particular a vehicle seat (100), in which: the longitudinal adjustment device (110) comprises at least one rail arrangement (112) having a first rail element (114) and a second rail element (116), which can be moved relative to each other, each having at least two rollers (120, 130), 122) is located between the first track element (114) and the second track element (116); wherein one roller (120) is rotatably mounted without clearance and the other roller (122) is rotatably mounted with clearance and so as to be spring-biased; as seen in the height direction (z), a gap-free mounted roller (120) is rotatably mounted on the upper swivel bearing (118.1) so as to be stationary, and a movably mounted roller (122) is movably rotatably mounted on the lower swivel bearing (118.2). The invention also relates to a vehicle seat (100) comprising such a longitudinal adjustment device (110).

Description

Technical Field

[0001] The invention relates to a longitudinal adjustment device, in particular a longitudinal adjustment device for a vehicle seat, the longitudinal adjustment device having at least one pair of rails and a vehicle seat. Background Art

[0002] The longitudinal adjustment device of the seat usually comprises two pairs of rails, which are arranged at a distance from each other and consist of two rails in each case, the upper rail being assigned to the seat and the lower rail being assigned to the floor of the vehicle. The longitudinal adjustment device of the seat also comprises at least one spring-loaded movable plate-shaped locking component, which is held on the upper rail and blocks the movement of the upper rail in the lower rail in the locking position. The lower rail can have a through hole, while the upper rail is provided with an opening, and the locking component carries projections on its two opposite longitudinal sides, which projections can be moved into the opening and the through hole by a spring in the locking position. Such a longitudinal adjustment device of the seat is disclosed, for example, in European patent EP 1 227950 B1.

[0003] Pairs of rails with an upper rail and a lower rail are known from the prior art, with rollers being arranged between them so that the upper rail rolls on the lower rail and vice versa. Conventionally, the rollers are rotatably mounted on the upper rail or the lower rail via bearing bolts. Summary of the invention

[0004] Purpose

[0005] The object of the invention is to specify a longitudinal adjustment device which is improved with respect to the prior art and has a simple structure and comprises an improved bearing.

[0006] plan

[0007] The longitudinal adjustment device according to the present invention comprises at least one pair of rails having a first rail element and a second rail element, the first rail element being specifically configured as an upper rail and the second rail element being specifically configured as a lower rail, and the upper rail and the lower rail being movable relative to each other, wherein at least two or more support points are arranged between the first rail element and the second rail element, wherein at least two rollers are arranged at the corresponding support points, wherein one of the rollers is mounted rotatably without clearance at the corresponding support point, and the other roller is mounted movably rotatably, in particular with clearance so as to be biased by a spring.

[0008] For example, viewed in the height direction or perpendicularly to the longitudinal adjustment direction, a roller mounted without play is mounted rotatably on an upper rotary bearing and is thus stationary. A movably mounted roller is mounted movably rotatably, for example, on a lower rotary bearing.

[0009] For example, the rollers are rotatably mounted in one of the rail elements, in particular in the movable rail element, such as the upper rail.

[0010] In particular, the rollers of the respective bearing points are configured such that a self-centering roller bearing is formed. For example, at the respective bearing points in one rail element, in particular the movable rail element, the rollers form a self-centering roller bearing between opposing running surfaces on another rail element, in particular the stationary rail element. In particular, such a roller arrangement with an upper stationary roller and a lower movable roller allows a self-centering function between the upper stationary roller and the lower movable roller. The lower movable roller can also have a self-centering function and / or a tolerance compensation function and can be offset in the height direction with or without a stroke limitation.

[0011] For example, the first rail element, in particular the upper rail, can be configured as a movable rail element, a movable slider or a sliding rail. The second rail element, in particular the lower rail, can be configured as a fixed-position rail element, such as a fixed floor rail or a fixed rail. The movable upper rail is slidably mounted relative to the lower rail, for example, via rollers at corresponding support points. The upper rail can also be configured to support a seat. The lower rail can be fastened, for example, to the vehicle floor or body.

[0012] For example, the upper rail comprises two rotary bearings for rollers at the respective bearing points. The two rotary bearings per bearing point are configured in each case as roller bearings. The two rotary bearings with rollers form a self-centering roller bearing per bearing point. For example, the lower rail comprises two running surfaces for the two rotary bearings per bearing point.

[0013] For example, the respective bearing point comprises a gapless roller as a first roller, which is mounted rotatably without play, in particular radially, on a first rotary bearing of the upper rail. In other words: the first rotary bearing of each bearing point is configured as a fixed rotary bearing or fixed bearing. The first roller or the gapless roller rolls on the first running surface of the lower rail.

[0014] For example, the corresponding support point also includes a movable roller as a second roller, which is rotatably mounted on the second rotary bearing of the upper rail, with a particularly vertical or radial clearance, and is thus biased by a spring. In other words: the second rotary bearing of each support point is configured as a movable rotary bearing. The second roller or the movable roller rolls on the second running surface of the lower rail. For example, a spring element can be provided for the biasing bearing of the second roller or the movable roller. The spring element is configured, for example, as a flat helical spring or a leaf spring. The spring element can be biased and coupled to the second roller or the movable roller, in particular its bearing bolt, in the assembled state, for example in a bent manner. In particular, the spring element is arranged at one end on the side wall of the upper rail and at the opposite end on the bottom area of ​​the upper rail. The central spring part acts on the movable roller, in particular on the bearing bolt of the movable roller.

[0015] For example, the spring element can be designed to spring-bias the movable roller in the direction of the lower running surface of one of the rail elements, in particular the stationary rail element, with or without a travel limitation. In particular, the spring element can be designed such that its spring force is perpendicular to the longitudinal adjustment direction of one of the rail elements, in particular the movable rail element. The spring element can also be designed such that the movable roller can be rotationally positioned in a self-centering manner, in particular on the lower running surface.

[0016] The advantages achieved by the invention are, in particular, that due to the combination of a backlash-free roller (also called "fixed" roller) and a backlash-free roller (also called "movable" roller) mounted at one or more support points of the longitudinal adjustment device according to the invention, and in particular through the configuration of self-centering roller bearings, a tolerance compensation function can be achieved, in particular radially and / or vertically. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is explained in more detail below with reference to the exemplary embodiments shown in the accompanying drawings. However, the present invention is not limited to these exemplary embodiments. In the accompanying drawings:

[0018] FIG. 1 shows a schematic diagram of a vehicle seat with a longitudinal adjustment device according to the prior art,

[0019] Figure 2 An exemplary embodiment of an upper rail of a longitudinal adjustment device according to the invention is schematically shown in perspective and in partial section,

[0020] Figure 3 Schematically showing the Figure 2 A perspective view from below of an exemplary embodiment of an upper track,

[0021] Figure 4 The cross-sectional view schematically shows the Figure 2 A magnified detail of the support points of the upper rail.

[0022] Figure 5 Schematically showing the Figure 2 A perspective view from above of an exemplary embodiment of an upper track,

[0023] Figure 6 Schematically showing a cross-section in the region of a first roller of a bearing point of a longitudinal adjustment device according to the invention,

[0024] Figure 7 Schematically showing the case without the second roller Figure 6 A cross-sectional view in the region of the bearing point of the first roller,

[0025] Figure 8 Schematic showing the basis without the lower track Figure 6 A cross-sectional view in the area of ​​the support point,

[0026] Fig. 9 Schematic showing the basis without the lower track Figure 7 A cross-sectional view in the region of the first roller,

[0027] Fig.10 a perspective view schematically showing an exemplary embodiment of a first roller,

[0028] Fig.11 Schematically showing a cross-section in the region of a second roller of a bearing point of a longitudinal adjustment device according to the invention,

[0029] Fig.12 Schematically showing the case without the first roller Fig.11 A cross-sectional view in the region of the bearing point of the second roller,

[0030] Fig.13 Schematic diagram showing the case without the first roller and without the lower rail Fig.11 A cross-sectional view in the area of ​​the support point,

[0031] Fig.14 Schematic showing the basis without the lower track Fig.13 A cross-sectional view in the region of the second roller, and

[0032] Fig.15 A perspective view of an exemplary embodiment of a second roller is schematically shown. DETAILED DESCRIPTION

[0033] In all the Figures, mutually corresponding parts are provided with the same reference symbols.

[0034] The vehicle seat 100 schematically shown in FIG. 1 is described hereinafter by using three spatial directions extending perpendicularly to one another. The longitudinal direction x in the vehicle seat 100 installed in the vehicle extends substantially horizontally and preferably parallel to the vehicle longitudinal direction, which corresponds to the usual direction of travel of the vehicle. The transverse direction y extending perpendicularly to the longitudinal direction x is also oriented horizontally in the vehicle and extends parallel to the vehicle transverse direction. The height direction z extends perpendicularly to the longitudinal direction x and perpendicularly to the transverse direction y. In the seat 100 installed in the vehicle, the height direction z preferably extends parallel to the vehicle height axis.

[0035] The position information and direction information used, such as front, rear, top and bottom, relate to the viewing direction of an occupant sitting in a normal sitting position in the vehicle seat 100, wherein the vehicle seat 100 is installed in a vehicle in a use position suitable for passenger transportation, has an upright backrest 102 and is oriented in the direction of travel in a conventional manner. However, the vehicle seat 100 can also be mounted or moved in a different orientation, for example transversely to the direction of travel.

[0036] The backrest 102 can be arranged pivotably on a seat part 104 of the vehicle seat 100. For this purpose, the vehicle seat 100 can include an accessory 106, in particular an adjustment accessory, a swivel accessory, a latch accessory or a rocker accessory.

[0037] Position information and direction information used, such as, for example, radially, axially and in the circumferential direction, refers to the rotation axis 108 of the fitting 106. Radially means perpendicular to the rotation axis 108. Axially means in the direction of the rotation axis 108 or parallel to the rotation axis.

[0038] The vehicle seat 100 may include a longitudinal adjustment device 110. The longitudinal adjustment device 110 comprises, for example, a track arrangement 112 having a first track element 114 and a second track element 116. The first track element 114 is adjustable in the longitudinal direction x relative to the second track element 116. The first track element 114 is fastened to the seat part 104. The second track element 116 is fastened to a structural element of the vehicle, for example a vehicle floor.

[0039] For improved clarity, the first rail element 114 is denoted in the following description as upper rail 114. The upper rail 114 (also referred to as sliding rail or slider) is assigned to the vehicle seat 100 and is designed to support the vehicle seat 100. The second rail element 116 is denoted below as lower rail 116. The lower rail 116 is fixedly connected, for example, to the floor of the vehicle.

[0040] Figures 2 to 15 Exemplary embodiments and developments of the longitudinal adjustment device 110 are shown in detail below.

[0041] Figure 2 An exemplary embodiment of an upper rail 114 of a longitudinal adjustment device 110 (shown in FIG. 1 ), which will be described in detail below, is schematically shown in perspective and partial cross-sectional views.

[0042] The upper rail 114 of the longitudinal adjustment device 110 comprises at least one or more support points 118 for movable support of the upper rail 114 relative to the lower rail 116. In the exemplary embodiment shown, two support points 118 are provided. However, more support points 118 or only one support point 118 may be provided (not shown in more detail).

[0043] The respective support point 118 comprises at least two rollers 120 and 122 .

[0044] The first roller 120 (also called free-play mounted roller or fixed-position roller) of the corresponding bearing point 118 is rotatably mounted free of play. The second roller 122 (also called movable roller or tolerance compensation roller) of the corresponding bearing point 118 is rotatably mounted with play and is thus spring-biased.

[0045] As seen in the height direction z, the first roller 120, which is mounted in a particularly gapless manner, is rotatably mounted in a fixed position on the upper rotary bearing 118.1. The second roller 122, which is mounted in a particularly movable manner, is rotatably mounted on the lower rotary bearing 118.2, as shown in FIG. Figure 2 and Figure 4 shown.

[0046] In particular, the rollers 120, 122 of the respective bearing points 118 are configured to form self-centering roller bearings 124. For example, the rollers 120, 122 of the respective bearing points 118 are arranged on opposite running surfaces 126, 128 (eg, Figure 6 A self-centering roller bearing 124 is formed between the two rollers.

[0047] In other words: at the respective bearing point 118, the combination of a first roller 120 mounted without play (also called a "fixed" roller or fixed-position roller) and a second roller 122 mounted with play (also called a "movable" roller or "displaceable" roller) forms a self-centering roller bearing 124. The self-centering roller bearing 124 at each bearing point 118 allows a simple tolerance compensation function in radial and / or vertical direction.

[0048] For example, the upper rail 114 can be configured as a movable slide or sliding rail. Figure 6 and Figure 7 ) can be configured as, for example, a fixed floor rail or a fixed rail.

[0049] For example, the movable upper track 114 is slidably mounted relative to the lower track 116 via rollers 120 , 122 at respective support points 118 . The upper track 114 may also be configured to support the vehicle seat 100 .

[0050] For example, by fastening element 130 (such as Figure 6 The lower rail 116 may be fastened to the vehicle floor or body by means of bolts, rivets or screws, as shown.

[0051] For example, the upper rail 114 may include two rotary bearings 132, 134 at respective support points 118: a first rotary bearing 132 for the first roller 120 and a second rotary bearing 134 for the second roller 122. The first rotary bearing 132 has a first axis of rotation 133. The second rotary bearing 134 has a second axis of rotation 135.

[0052] The first roller 120 is rotatably mounted on a first rotary bearing 132, in particular without play, in particular without play radially, on an upper rotary bearing 118.1 of the upper rail 114. The first roller 120 is thus a rotatable and fixed or stationary element with respect to its bearing position. The first rotary bearing 132 is configured as a fixed bearing or fixed bearing.

[0053] The second roller 122 is rotatably mounted on a second rotary bearing 134, in particular the lower rotary bearing 118.2, of the upper rail 114, in particular with vertical and / or radial play, thereby with a spring bias. Thus, the second roller 122 is a rotatable element and a movable or displaceable element with respect to its bearing position. The second rotary bearing 134 is configured as a movable bearing or a movable bearing.

[0054] By this combination of a first roller 120 mounted without play (also called “fixed” roller) and a second roller 122 mounted with play (also called “movable” roller), a self-centering roller bearing 124 is formed at the corresponding support point 118 of the longitudinal adjustment device 110 .

[0055] The first roller 120 of each bearing point 118 can also or alternatively have an integrated function of self-centering in the upper rail 114 and can be mounted in the upper rail 114 , for example, with play, in particular radial and / or vertical play.

[0056] The first roller 120 (also referred to as the fixed roller) is rotatably held, for example, by means of a bearing bolt 120.0 or a pin and a bearing support 120.3 (eg Fig.11 The first roller 120 is basically rotatably arranged in the U-shaped profile of the upper rail 114. Figure 3In the transition area between the upper rail 114 and the bottom area 114.1, the upper rail 114 can have a recess 114.2 in each case, through which the first roller 120, in particular the first running wheel 120.1 of the first roller 120, protrudes at least partially above the bottom area 114.1.

[0057] The second roller 122 (also referred to as an active roller) may have the above-mentioned integrated function of self-centering in the upper track 114 by means of a bearing provided with a gap and a spring bias.

[0058] Alternatively, the second roller 122 may be rotatably mounted in the upper rail 114 without a gap, and the first roller 120 may be rotatably mounted in the upper rail 114 with a gap (not shown).

[0059] In another alternative embodiment, both roller 120 and roller 122 may be rotatably mounted in upper track 114 with clearance (not shown).

[0060] The second roller 122 is rotatably held so as to be able to be moved in the height direction z, for example by means of a bearing bolt 122.0 or a pin and a bearing support 122.3 (eg Fig.12 ) is spring-loaded, in particular with radial play and / or vertical play in the bearing position in the upper rail 114 in the height direction z.

[0061] For example, a spring element 136, in particular a leaf spring or a bending spring, is provided for a spring bias or spring-loaded bearing of the second roller 122. For example, the spring element 136 can have a predetermined stroke, in particular a vertical stroke, with or without a stroke limitation. For example, the spring element 136 is provided with or without a stroke limitation in the height direction z, so that its spring force acts or can act directly on the second roller 122 or indirectly on its bearing bolt 122.0.

[0062] For example, the spring element 136 can be designed to cause the second roller 122 to move along the lower running surface (= second running surface 128, such as the lower running surface 128) of the lower rail 116 with or without travel limitation. Figure 6 In particular, the spring element 136 can be designed such that its spring force acts perpendicularly to the longitudinal adjustment direction in the longitudinal direction x of the upper rail 114. The spring element 136 can also be designed such that the second roller 122 (=active roller) is rotatably positioned on the lower running surface 128 (=second running surface 116.2) of the lower rail 116 in a self-centering manner.

[0063] For example, the spring element 136 is configured as a leaf spring or a spring strip. For example, the spring element 136 fixes one end 136.1 to the side wall 114.0 (eg, Figure 3 The second roller 122 is provided with a spring element 136 (shown) on the upper rail 114 and the opposite end 136.2 is fixed to the bottom area 114.1 of the upper rail 114, or a latch 137 is arranged on the front end of the upper rail 114 and a predetermined spring force is applied to the second roller 122 between the two ends 136.1 and 136.2. In the assembled state of the spring element 136 and the second roller 122, the spring element 136 is biased, for example, in a curved manner. In particular, the spring element 136 pushes the second bearing 134 of the second roller 122, in particular the second bearing bolt 122.0 of the second roller 122, with its inner curve. Thus, the second roller 122 is spring-biased and mounted in a tolerance-compensated manner in the height direction z, in particular relative to the lower rail 116.

[0064] The latch 137 is particularly intended to receive a rotary latch or a locking hook of the vehicle seat 100 in a locking manner and thus to fasten the vehicle seat 100 to the upper rail 114 .

[0065] Figure 3 Schematically showing the Figure 2 1 is a perspective view of an exemplary embodiment of an upper track 114 from below.

[0066] The longitudinal adjustment device 110 may also have at least one spring-loaded, movable, plate-shaped locking member 138, which is retained on the upper rail 114. The locking member 138, such as a locking plate or a locking lever, blocks the movement of the upper rail 114 in the lower rail 116 (as shown in FIG. 1 ) in a locked position. To this end, the lower rail 116 may have a through hole 116.5 (as shown in FIG. 1 ). Figure 7 As shown), the upper rail 114 is provided with an opening 140.

[0067] The locking member 138 may have a protrusion 142 on one or both opposite longitudinal sides, which in the locked position can be moved by a spring 144 to the opening 140 of the lower rail 116 (as shown in FIG. 1) and the through hole 116.5 (as shown in FIG. Figure 7 shown).

[0068] The longitudinal adjustment device 110 has two bearing points 118 , which are arranged, for example, in the end region of the upper rail 114 .

[0069] The spring element 136 is fixed with one end 136.1 in the spring receiver 146 in the side wall 114.0 of the upper rail 114. The spring element 136 is fixed with the opposite end 136.2 of the latch 137. The second roller 122 is spring-biased centrally between the two ends 136.1 and 136.2 and is mounted movably in the height direction z with or without stroke, in particular relative to the lower rail 116.

[0070] Two bearing points 118 are provided in the end region of the upper rail 114 , which in each case comprise two rollers 120 and 122 in a similar manner, which in turn form a self-centering roller bearing 124 .

[0071] Figure 4 The cross-sectional view schematically shows the Figure 2 An enlarged detail of one of the support points 118 of the upper rail 114 .

[0072] The first roller 120 is rotatably mounted on a first rotary bearing 132 of the upper rail 114 without play, in particular without radial play. The second roller 122 is rotatably mounted on a second rotary bearing 134 of the upper rail 114, in particular with vertical and / or radial play, so that a spring bias is achieved by means of a spring element 136, in particular relative to the rail arrangement 112, in particular relative to the lower rail 116.

[0073] The spring element 136 as described above is fixed to the latch 137 and the side wall 114.0 and exerts a spring force on the second roller 122 arranged therebetween.

[0074] The first roller 120 extends upwardly in the height z direction beyond the bottom region 114.1. The second roller 122 extends downwardly in the height z direction beyond the open end of the side wall 114.0.

[0075] Figure 5 Schematically showing the Figures 2 to 4 1 is a perspective view from above of an exemplary embodiment of the upper track 114 .

[0076] Figure 6 A cross section in the region of a first roller 120 of a bearing point 118 of a longitudinal adjustment device 110 according to the invention is schematically shown.

[0077] The upper rail 114 and the lower rail 116 are in each case configured as profiles, in particular U-profiles.

[0078] The lower rail 116 comprises, for example, two running surfaces 116 . 1 , 116 . 2 , at least one first running surface 116 . 1 for the first roller 120 and at least one second running surface 116 . 2 for the second roller 122 .

[0079] The first roller 120 is rotatably mounted on a first rotary bearing 132 of the upper rail 114 without play, in particular without radial play, and rolls on a first running surface 116 . 1 of the lower rail 116 .

[0080] The second roller 122 is rotatably mounted on a second rotary bearing 134 of the upper rail 114 , in particular with vertical play and / or radial play, so as to be spring-biased, and rolls on the second running surface 116 . 2 of the lower rail 116 .

[0081] The self-centering roller bearing 124 is formed by this combination of a first roller 120 (also called "fixed" roller) mounted without play at the respective bearing point 118 of the longitudinal adjustment device 110 and a second roller 122 (also called "movable" roller) mounted with play. In particular, the self-centering roller bearing 124 is configured as a self-centering 4-point bearing. The two rollers 120, 122 have in each case two running wheels 120.1, 120.2 and 122.1, 122.2, which in each case form a point bearing and together form a 4-point bearing.

[0082] The self-centering roller bearing 124 of the respective bearing point 118 is to be understood as meaning, in particular, a tolerance compensation of the rollers 120 and 122 between the lower rail 116 and the upper rail 114 and thus a self-centering bearing. For example, such a self-centering roller bearing 124 allows a tolerance compensation function, in particular in the radial and / or vertical direction (in the height direction z) between the lower rail 116 and the upper rail 114.

[0083] For a self-centering bearing of the first roller 120 between the upper rail 114 and the lower rail 116, the first roller 120, in particular its running wheels 120.1, 120.2, has a peripheral collar 120.4 corresponding to the bevel 116.3 of the first running surface 116.1.

[0084] For the self-centering bearing of the second roller 122 between the upper rail 114 and the lower rail 116, the second roller 122, in particular its running wheels 122.1, 122.2, has a slope 122.4 corresponding to the slope 116.4 of the respective second running surface 116.2.

[0085] Figure 7 Schematically showing the Figure 6 1. A cross-sectional view in the region of the first roller 120 without the second roller 122 in the bearing point 118 of FIG.

[0086] Figure 7 The self-centering bearing of the first roller 120 between the upper rail 114 and the lower rail 116 is shown by means of the peripheral collar 120.4 of the running wheels 120.1 and 120.2 and the corresponding bevel 116.3 of the first running surface 116.1. The corresponding peripheral collar 120.4 corresponds to the corresponding bevel 116.3 of the first running surface 116.1. The lower rail 116 has an associated running surface 116.1 for each running wheel 120.1 and 120.2, in each case with a bevel 116.3.

[0087] The first roller 120 is rotatably mounted without play via a bearing bolt 120 . 0 in the upper rail 114 .

[0088] At least one side wall 116.6 of the lower rail 116 has a through hole 116.5 for a locking member 138 (e.g. Figure 3 shown).

[0089] Figure 8 The cross section in the region of the bearing point 118 is schematically shown, wherein the first roller 120 is rotatably mounted without play between the upper rail 114 and the lower rail 116 via a bearing bolt 120.0, and the second roller 122 is mounted with play, according to Figure 6 and Figure 7 And there is no lower rail 116. The bearing bolt 120.0 is installed in the side wall 114.0 of the upper rail 114 without play.

[0090] Fig. 9 The schematic cross-section of the region of the first roller 120 is shown, which is rotatably mounted without play via a bearing bolt 120.0 on the upper rail 114, according to Figure 7 or 8, without the lower track 116.

[0091] Fig.10 A perspective view of an exemplary embodiment of a first roller 120 is schematically shown. The first roller 120 is configured as a cylindrical roller having two running wheels 120.1 and 120.2. The first roller 120 can be configured as a whole (as shown). The two running wheels 120.1, 120.2 are connected together by an integrated web 120.5. The web 120.5 extends along the first rotation axis 133.

[0092] The respective running wheel 120 . 1 , 120 . 2 has, for example, a peripheral collar 120 . 4 for self-centering the first roller 120 relative to the upper rail 114 .

[0093] Fig.11 A schematic cross-section of the region of a second roller 122 of one of the bearing points 118 of the longitudinal adjustment device 110 according to the invention is shown.

[0094] The second roller 122 is rotatably mounted and spring-biased on a second rotary bearing 134 of the upper rail 114 , in particular with vertical and / or radial play, and rolls on the second running surface 116 . 2 of the lower rail 116 .

[0095] For the self-centering bearing of the second roller 122 between the upper rail 114 and the lower rail 116 , the second roller 122 , in particular its running wheels 122 . 1 , 122 . 2 , has in each case a slope 122 . 4 corresponding to the slope 116 . 4 of the second running surface 116 . 2 .

[0096] Fig.12 Schematically shows the Fig.11 A cross-sectional view of the region of the second roller 122 of the bearing point 118 mounted with play in the upper rail 114 , without the first roller 120 .

[0097] The second roller 122 is rotatably mounted with clearance via a bearing bolt 122.0 in the upper rail 114. For this purpose, the side wall 114.0 has a through hole 114.5 as a bearing support 122.3. For example, the through hole 114.5 can be configured as a slot or a circular hole. For example, the size of the through hole 114.5 is larger than the outer peripheral size of the bearing bolt 122.0.

[0098] Fig.13 A cross-sectional view schematically shows the region of the support point 118, according to Fig.11 and Fig.12 , only the second roller 122, no first roller 120, no lower track 116 (such as Figure 2 The second roller 122 is rotatably mounted in the through hole 114.5 with a radial gap and / or a vertical gap.

[0099] The spring element 136 acts directly on the second roller 122 .

[0100] The latch 137 is arranged at the front end of the upper rail 114 on the bottom region 114 . 1 of the upper rail 114 , in particular connected in a force-fitting manner, in a form-fitting manner and / or by material bonding.

[0101] Fig.14 Schematically shows the Fig.13 A cross-sectional view of the region of the second roller 122 mounted with clearance in the upper rail 114, without the lower rail 116 and without the locking member 138 (eg, Figure 3 shown).

[0102] Fig.15 A perspective view of an exemplary embodiment of the second roller 122 is schematically produced.

[0103] The second roller 122 is configured as a cylindrical roller having two running wheels 122.1 and 122.2. The second roller 122 can be configured as a whole (as shown in the figure). The two running wheels 122.1, 122.2 are connected together by an integrated web 122.5. The web 122.5 extends along the second rotation axis 135.

[0104] For example, the respective running wheels 122.1, 122.2 have an inclined surface 122.4 for self-centering of the second roller 122 relative to the lower rail 116 (eg, Figure 6 , Fig.11 and Fig.12 shown).

[0105] The features disclosed in the above description and in the drawings are of essential significance for the implementation of the invention in its various embodiments, either alone or in combination, as long as they remain within the scope of protection of the invention.

[0106] Reference numerals list

[0107] 100 Vehicle seats

[0108] 102 Backrest

[0109] 104 Seat Parts

[0110] 106 Accessories

[0111] 108 Rotation axis

[0112] 110 Longitudinal adjustment device

[0113] 112 Track Settings

[0114] 114 First rail element, upper rail

[0115] 114.0 Sidewall

[0116] 114.1 Bottom area

[0117] 114.2 Recess

[0118] 114.5 Through opening

[0119] 116 Second track element, lower track

[0120] 116.1 First running surface

[0121] 116.2 Second running surface

[0122] 116.3 Bevel

[0123] 116.4 Slope

[0124] 116.5 Through hole

[0125] 116.6 Sidewall

[0126] 118 Support point

[0127] 118.1 Upper swivel bearing

[0128] 118.2 Lower swivel bearing

[0129] 120 Roller, first roller / roller mounted without gap

[0130] 120.0 Bearing bolt

[0131] 120.1 First running surface

[0132] 120.2 Second running surface

[0133] 120.3 Bearing bracket

[0134] 120.4 Collar

[0135] 120.5 belly plate

[0136] 122 Roller, Second / Active Roller

[0137] 122.0 Bearing bolt

[0138] 122.1 First running round

[0139] 122.2 Second running round

[0140] 122.3 Bearing bracket

[0141] 122.4 Slope

[0142] 122.5 belly plate

[0143] 124 Self-centering roller bearings

[0144] 126 running surface, first running surface

[0145] 128 running surface, second running surface

[0146] 130 Fastening elements

[0147] 132 First rotary bearing

[0148] 133 First rotation axis

[0149] 134 Second rotary bearing

[0150] 135 Second rotation axis

[0151] 136 Spring element

[0152] 136.1 End

[0153] 136.2 Opposite ends

[0154] 137 Latch

[0155] 138 Locking parts

[0156] 140 Opening

[0157] 142 Bump

[0158] 144 Spring

[0159] 146 Spring Receiver

[0160] x vertical direction

[0161] y horizontal direction

[0162] z height direction

Claims

1. A longitudinal adjustment device (110) for a seat, in particular a vehicle seat (100), in, The longitudinal adjustment device (110) comprises at least one track arrangement (112) having a first track element (114) and a second track element (116) movable relative to each other, and wherein at least two or more support points (118) are arranged between the first track element (114) and the second track element (116), each of the support points having at least two rollers (120, 122), wherein one of the rollers (120) is mounted rotatably without play at a corresponding bearing point (118) and the other roller (122) is mounted rotatably and freely, and Therein, as seen in the height direction (z), the gaplessly mounted roller (120) is rotatably mounted on an upper rotary bearing (118.1) so as to be positionally fixed, and the movably mounted roller (122) is movably rotatably mounted on a lower rotary bearing (118.2).

2. The longitudinal adjustment device (110) according to claim 1, wherein: The roller (120, 122) is rotatably mounted within one of the track elements (114, 116).

3. The longitudinal adjustment device (110) according to claim 1 or 2, wherein: The rollers (120, 122) of the respective bearing points (118) are configured and arranged such that a self-centering roller bearing (124) is formed.

4. The longitudinal adjustment device (110) according to claim 3, wherein: The two rollers (120, 122) form the self-centering roller bearing (124) between opposing running surfaces (126, 128) on the other track element (116) at respective bearing points (118) in one track element (114).

5. The longitudinal adjustment device (110) according to one of the preceding claims, wherein: The respective bearing point (118) comprises the play-free roller (120), which is rotatably mounted on a first rotary bearing (132) of the first track element (114) and rolls on a first running surface (126) of the second track element (116).

6. The longitudinal adjustment device (110) according to claim 5, wherein: The first rotary bearing (132) is configured as a fixed-position bearing.

7. The longitudinal adjustment device (110) according to one of the preceding claims, wherein: The respective bearing point (118) comprises the movable roller (122), which is rotatably mounted on a second rotary bearing (134) of the first track element (114) and rolls on a second running surface (128) of the second track element (116).

8. The longitudinal adjustment device (110) according to claim 7, wherein: The second rotary bearing (134) is configured as a movable bearing.

9. The longitudinal adjustment device (110) according to one of the preceding claims, wherein: The movable roller (122) is mounted so as to be spring biased by means of at least one spring element (136).

10. The longitudinal adjustment device (110) according to claim 9, wherein: The at least one spring element (136) is configured as a leaf spring or a bending spring.

11. The longitudinal adjustment device (110) according to claim 9 or 10, wherein: The at least one spring element (136) is coupled to a bearing bolt (122.0) of the movable roller (122).

12. The longitudinal adjustment device (110) according to one of claims 9 to 11, wherein: The spring element (136) is designed to spring-bias the movable roller (122) in the direction of a lower running surface (128, 116.2) of one of the track elements (116) with or without travel limitation.

13. The longitudinal adjustment device (110) according to one of claims 9 to 12, wherein: The spring element (136) is designed in such a way that its spring force acts perpendicularly to a longitudinal adjustment direction of one of the rail elements (114).

14. The longitudinal adjustment device (110) according to one of claims 9 to 13, wherein: The spring element (136) is designed such that the movable roller (122) is rotationally positionable in a self-centering manner.

15. A seat, in particular a vehicle seat (100), comprising a longitudinal adjustment device (110) according to one of claims 1 to 14.

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