Longitudinal adjuster and vehicle seat

Abstract

The invention relates to a longitudinal adjuster (106) comprising at least: a rail pair (108) and a drive device (120) for the rail pair (108), the rail pair (108) comprising a first rail and a second rail movably guided on the first rail, the drive device (120) has at least one motor (121), a transmission unit (122), a main shaft block (130) fixed to the first rail or the second rail and having an internal thread, a main shaft (132) having an external thread (134) operably connected to the internal thread of the main shaft block (130), and a main shaft bearing (140) wherein the main shaft (132) extends along a longitudinal axis and is mounted in the main shaft block (130) and the main shaft bearing (140), the main shaft (132) has a main shaft bearing (140) which is mounted on the main shaft (132) so as to be rotatable about a main shaft axis (138), and wherein the main shaft bearing (140) has at least one main shaft nut (146) which is fastened to and rotates with the main shaft (132), and wherein the main shaft bearing (140) is in the form of an axial bearing which transmits a linear movement of the main shaft (132) to the first track. The invention further relates to a vehicle seat (100) having such a longitudinal adjuster (106), in which the spindle bearing (140) has a ball bearing (144) in the axial direction and a sliding bush (180) with an axial play (182) relative to the spindle nut (146).

Description

Technical Field

[0001] The invention relates to a longitudinal adjuster for a vehicle seat, in particular a motor vehicle seat. The invention also relates to a vehicle seat. Background Art

[0002] DE102017218492A1 has disclosed a longitudinal adjuster, in particular for a vehicle seat. The longitudinal adjuster has at least one track pair, which is formed by a first track and a second track that is displaceable in the longitudinal direction relative to the first track, wherein the tracks engage with each other and form an inner channel. A spindle nut mounted together with the second track and a spindle operatively connected to the spindle nut are arranged in the inner channel, wherein a gear that can be driven by a motor and interacts with the spindle is arranged at one end of the first track. The spindle is mounted in the gear at the front end section of the spindle and in the rotary bearing of the first track at the rear end section of the spindle. The first crossbar is received in a groove of the first rail in front of the spindle nut in the longitudinal direction, wherein the spindle is guided through an opening of the first crossbar in a contactless manner, in particular forming a peripheral gap, wherein a shoulder of the spindle is arranged spaced apart from the first crossbar in the longitudinal direction toward the front, wherein the first crossbar is caught between the first rail and the shoulder in response to a predetermined force action, for example in the event of a collision, in particular by a displacement of the first rail, and the force can be dissipated from the first rail to the second rail via the first crossbar, the shoulder, the spindle and the spindle nut.

[0003] For example, US 2019 / 0381915 A1 and DE 10 2017 218 492 A1 have disclosed further longitudinal adjusters. Summary of the invention

[0004] question

[0005] The invention is based on the problem of improving a longitudinal adjuster of the type mentioned in the introduction, in particular to propose an electrically driven longitudinal adjuster with an integrated motor-gear unit, and to provide a corresponding vehicle seat.

[0006] Solution

[0007] With regard to the longitudinal adjuster, this problem is solved according to the invention by the features of patent claim 1. With regard to the vehicle seat, this problem is solved according to the invention by the features of patent claim 15.

[0008] Developments of the invention are subject matter of the dependent patent claims.

[0009] According to the invention, the first mentioned problem is solved by a longitudinal adjuster for a vehicle seat, in particular a motor vehicle seat, wherein the longitudinal adjuster has at least one track pair, the track pair having a first track, in particular a seat track, which can be connected to the vehicle seat, and a second track, in particular a floor track, which can be connected to the vehicle floor and on which the first track, in particular the seat track, can be displaceably guided, wherein the longitudinal adjuster has a drive device for adjusting the seat track relative to the floor track, and the drive device has at least one motor, a gear unit, a spindle block fixed relative to the first track (also called seat track) or relative to the second track (also called floor track) and having an internal thread, and a spindle having an external thread, which is operatively connected to the internal thread of the spindle block, and the spindle extends along a longitudinal axis and is mounted in the spindle block, and the spindle bearing is rotatable about the spindle axis, wherein the spindle bearing has at least one spindle nut, which is fastened to the spindle and rotates together with the spindle, wherein the spindle bearing is configured as an axial bearing, which transmits a linear movement of the spindle, in particular via a bracket, to the seat track. In the axial direction, the spindle bearing has firstly a ball bearing and secondly a sliding bushing with axial play relative to the spindle nut.

[0010] For example, the sliding bushing can be arranged in front of the ball bearing, as viewed in the direction of travel. Such a rearward or rearward arrangement of the ball bearing has a higher longitudinal adjuster efficiency, so that a small and low-performance drive can be used.

[0011] In another example, the ball bearing can be arranged in front of the sliding bushing in the direction of travel. This rearward arrangement of the sliding bushing enables mechanical synchronization of two longitudinal adjusters arranged parallel to each other, in particular two movable tracks of these longitudinal adjusters, in the event of displacement of the vehicle seat.

[0012] By means of this rearward arrangement of the sliding bushing and its axial play, for example, the spindle bearing can realize a track adjustment in a simple manner, and unequal track adjustments can be synchronized or compensated when the vehicle seat is displaced in the axial direction toward the front or toward the rear due to different mechanical loads, in particular different friction forces.

[0013] In particular, this type of spindle bearing makes it possible to synchronize two adjustable rails of a longitudinal adjuster arranged parallel to one another, by means of a front (seen in the direction of travel) ball bearing (which is configured as an axial ball bearing) and a rear sliding bushing with axial play (as a bearing bushing), when adjusting the vehicle seat longitudinally without an electronic system. For example, the leading of one of the rails (in particular the movable upper rail) increases the pressure and therefore the friction on the rear or rear sliding bushing (bearing bushing). In contrast, the other rail at the rear, in particular the other movable upper rail, receives the pressure on the axial ball bearing located at the front in the direction of travel and therefore has less friction. Due to its reinforcement, the vehicle seat ensures an accumulation of pressure. In the case of such a non-electronically synchronizable design of a longitudinal adjustment mechanism of a seat with two (in particular structurally identical or completely identical) longitudinal adjusters, a high-power motor is provided as a drive device.

[0014] In particular, a spindle bearing of this type does not absorb any radial forces or only absorbs very small radial forces.A spindle bearing configured as an axial bearing is to be understood in particular as a thrust bearing which can absorb axial loads, in particular along the longitudinal axis of the spindle.

[0015] The spindle nut is fastened to the spindle so that it cannot rotate. The linear movement of the spindle can be transmitted to the seat rail directly via a spindle bearing (configured as an axial bearing), for example, or indirectly via a bracket. For example, a spindle bearing configured as an axial bearing is arranged between the spindle nut and the seat rail. In the case of indirect transmission of the linear movement via the bracket, a spindle bearing configured as an axial bearing is arranged between the spindle nut and the bracket.

[0016] The axial bearing can, for example, rest against the bracket. In particular, the axial bearing can be rotatably mounted on the bracket. The bracket is in turn fastened to the seat track.

[0017] Furthermore, a sliding bushing can be arranged between the spindle nut and the bracket. For example, the sliding bushing can be arranged between the spindle nut and the bracket in an axial and radial direction without stress. In particular, the sliding bushing can be arranged in the axial and radial direction with play between the spindle nut and the bracket. This type of sliding bushing serves to absorb and dampen or dissipate acting radial forces.

[0018] Furthermore, two spindle nuts secured against rotation (also called single nuts) can be provided for the spindle, wherein in the case of two spindle nuts a spindle bearing configured as an axial bearing is arranged between the two spindle nuts.

[0019] The axial play can be provided, for example, between one of the two spindle nuts and the sliding bushing. The spindle bearing has a one-sided axial play between one of the spindle nuts and the sliding bushing. The ball bearing can be provided, for example, between the other spindle nut and the bracket. If an axial play is provided, this can also occur on the ball bearing side.

[0020] The ball bearing can be arranged in a preloaded manner between the spindle nut and the spindle bearing, for example by means of a spring element. For example, the ball bearing can be axially supported between the inner ring and the outer ring by means of a spring element and can thus be mounted without play. In this exemplary embodiment, there is also no play between the bearing bushing and the bracket.

[0021] For example, the support can have a through opening into which the sliding bushing is pushed, so that the play between the sliding bushing and the spindle nut is settable or is set. The spacing between the rotationally locked nuts (also called spindle nuts or single nuts) can, for example, be a constant configuration. The intermediate space formed by this constant spacing can be used for the support, the bearing bushing collar and the ball bearing, with or without axial play. If an additional spring (spring element) is provided in the case of a ball bearing, this ensures a play-free arrangement of the nut, support, ball bearing and bearing bushing collar.

[0022] According to the invention, the second mentioned problem is solved by a vehicle seat comprising a longitudinal adjuster as described above.

[0023] In addition, another identical or structurally identical longitudinal adjuster can be provided, which has the same track pair and the same drive device, in particular a direct drive device, wherein an undesired asynchronous adjustment of the second track of a track pair of one longitudinal adjuster relative to the second track of another track pair of the other longitudinal adjuster can be partially compensated by axial play.

[0024] The advantages achieved by the invention consist in particular in that an efficient, in particular low-friction spindle mounting can be achieved by means of a spindle bearing with axial play, or a spindle mounting which compensates for different adjustment movements at least in certain areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In the following, the invention is explained in more detail based on advantageous exemplary embodiments shown in the drawings. However, the invention is not limited to these exemplary embodiments. In the drawings:

[0026] Figure 1 A vehicle seat according to the invention with a longitudinal adjuster according to the invention is schematically shown;

[0027] Figure 2A perspective view of a longitudinal adjustment mechanism for a seat according to the invention is shown, which has two longitudinal adjusters, which are arranged parallel to each other and each have a pair of rails,

[0028] Figure 3 Shows Figure 2 A cross-sectional view of a longitudinal adjuster along the longitudinal direction, and

[0029] Figure 4 Shows Figure 2 Schematic cross-section of a spindle bearing of a longitudinal adjuster. DETAILED DESCRIPTION

[0030] In all the Figures, mutually corresponding parts are provided with the same reference symbols.

[0031] In the following, the vehicle seat 100 according to the first exemplary embodiment (in Figure 1 100 is schematically shown in FIG. 101 ). With the vehicle seat 100 installed in the vehicle, the longitudinal direction x extends substantially horizontally and preferably parallel to the longitudinal direction of the vehicle corresponding to the normal direction of travel of the vehicle. The transverse direction y extending perpendicularly with respect to the longitudinal direction x is likewise oriented horizontally in the vehicle and extends parallel to the transverse direction of the vehicle. The vertical direction z extends perpendicularly to the longitudinal direction x and perpendicularly to the transverse direction y. With the vehicle seat 100 installed in the vehicle, the vertical direction z extends parallel to the vertical axis of the vehicle.

[0032] 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 seating position in the vehicle seat 100, wherein the vehicle seat 100 is installed in a vehicle in a use position suitable for passenger transportation, with an upright backrest 102 and oriented in a conventional manner in the direction of travel. However, the vehicle seat 100 according to the invention can also be installed in a different orientation, for example transversely relative to the direction of travel.

[0033] The vehicle seat 100 has a seat part 104 and a backrest 102, the inclination of which is adjustable relative to the seat part 104 and which can be pivoted forward in the direction of the seat part 104. The vehicle seat 100 has a longitudinal adjuster 106 for longitudinally displaceable and longitudinally adjustable installation of the vehicle seat 100 in a vehicle.

[0034] The longitudinal adjuster 106 serves for longitudinal adjustment, i.e. adjustment of the longitudinal seat position of the vehicle seat 100. The vehicle seat 100 preferably has one longitudinal adjuster 106 on each vehicle seat side in each case. The first longitudinal adjuster 106 is arranged on the tunnel side and the second longitudinal adjuster 106 is arranged on the door sill side. The two longitudinal adjusters 106 of the vehicle seat 100 extend parallel to each other. The vehicle seat 100 preferably has two longitudinal adjusters 106 of identical construction.

[0035] The longitudinal adjuster 106 comprises a rail pair 108 having a seat rail 4 connectable to the vehicle seat 100 and a floor rail 110 connectable to the vehicle floor and on which the seat rail 110 is displaceably guided.

[0036] The two longitudinal adjusters 106 can be adjusted in a mutually synchronous manner, in particular electronically, or mechanically via a flexible shaft. In the following, only one of the two structurally identical longitudinal adjusters 106 is described.

[0037] Figures 2 to 3 A longitudinal adjuster 106 having a pair of rails 108 is shown. Figure 2 A perspective view of a longitudinal seat adjustment mechanism 105 is shown, which has two identical or structurally identical longitudinal adjusters 106, which are arranged parallel to one another, wherein their seat rails 110 are connected to the vehicle seat 100 for longitudinal adjustment of the vehicle seat. The two longitudinal adjusters 106 can be adjusted synchronously with one another, in particular electronically, or mechanically via a flexible shaft. The longitudinal adjusters 106 are oriented in a direction of travel 107 in a similar manner to the vehicle seat 100.

[0038] In the following, considering the structurally identical design of the longitudinal adjusters 106 , the present invention will be described with respect to the latter.

[0039] The respective longitudinal adjuster 106 has a drive device 120 for adjusting the seat rail 110 relative to the floor rail 112. The drive device 120 has at least one motor 121 and a gear unit 122. The drive device 120 is configured as a direct drive.

[0040] The gear unit 122 and the motor 121 are at least partially arranged in a cavity 118 formed between the seat track 110 and the floor track 112 .

[0041] In the present example, the motor 121 at one end of the seat rail 110 at least partially protrudes into the seat rail 110 at the end side. As an alternative, the motor 121 can protrude out of the seat rail 110 in the vertical direction z upwards through a cutout in the seat rail 110 in a manner not shown, or through the seat rail 110. In another alternative, the gear unit 122 and the motor 121 can be arranged completely in the cavity 118 of the rail pair 108.

[0042] In the present example, the gear unit 122 is completely arranged in the cavity 118 formed between the seat rail 110 and the floor rail 112. In the present example, the motor 121 and the gear unit 122 are attached together in the front end region of the seat rail 110.

[0043] As an alternative, the motor 121 and the gear unit 122 may also be arranged in the rear end region of the seat rail 110. The two end side arrangements of the motor 121 and the gear unit 122 make the motor 121 and the gear unit 122 easily accessible, so that these components can be replaced at will or easily repaired even when the longitudinal adjuster 106 is installed in the vehicle.

[0044] In the case where the sliding bushing 180 and the ball bearing 144 are provided (such as Figure 4 As shown), the motor 121 and the gear unit 122 are preferably arranged in the front end area of ​​the seat track 110.

[0045] The gear unit 122 can be connected to the seat rail 110, in particular by a force fit and / or a form fit (e.g. a threaded connection), by material bonding (e.g. welding via a fastener 124 with a seam 126) and / or by a form fit (e.g. pressing) to be able to transmit greater forces.

[0046] Figure 3 A longitudinal section through the longitudinal adjuster 106 is shown.

[0047] The drive device 120 is configured as a spindle drive device, for example, and includes at least a motor 121, a gear unit 122, a spindle block 130 fixed relative to the floor rail 112 or relative to the seat rail 110 and having an internal thread 128, and a spindle 132 having an external thread 134, which is operably connected to the internal thread 128 of the spindle block 130.

[0048] The drive device 120 can be based on, for example, a rotating spindle 132, in particular a spindle 132 rotatably mounted relative to the seat track 110, which allows longitudinal adjustment via a nut, i.e. a spindle block 130, which is fastened to the floor track 112. By means of a corresponding (small) lead of the threads (internal thread 128 and external thread 134, in particular a trapezoidal thread (e.g. Tr8x2)), a self-locking effect between the spindle block 130 and the spindle 132, which is required for distributing the load in the event of a collision, can be achieved.

[0049] Furthermore, the drive device 120 comprises a clutch 136 for coupling the motor 121, in particular the gear unit 122, to the main shaft 132. The motor 121 is indirectly coupled to the main shaft bearing 140 via the gear unit 122 and the clutch 136. The clutch 136 is in particular arranged between the main shaft 132 and the output shaft 123. The clutch 136 may be a conventional clutch 136 for compensating tolerances, and may be configured, for example, as a compensating clutch or a slipping clutch.

[0050] The spindle 132 extends along a longitudinal axis in a longitudinal direction x. The spindle 132 is rotatably mounted about a spindle axis 138 in a spindle block 130 and a spindle bearing 140. The gear unit 122, the clutch 136, the spindle 132, the spindle bearing 140 and the optional motor 121 may be arranged on a common shaft 150 within the track pair 108.

[0051] For example, the common shaft 150 is disposed within the cavity 118 of the track pair 108. The common shaft 150 is surrounded by the seat track 110 and the floor track 112.

[0052] The spindle 132 is screwed and mounted in the spindle block 130 and is rotatable about the spindle axis 138. In the case where the spindle block 130 is fixed, wherein the spindle block 130 is tightened, in particular fixedly screwed to the floor rail 112, the spindle 132 is axially movable about the spindle axis 138 along the longitudinal axis.

[0053] The spindle 132 is fixedly connected to the seat rail 110, for example via a spindle bearing 140, for example by tightening by a connecting screw 142. As an alternative, the spindle bearing 140 can be welded to the seat rail 110, in particular by material bonding, or pressed, in particular by force fit. The spindle bearing 140 comprises, for example, a ball bearing 144, which is directly or indirectly defined on both sides by a spindle nut 146, respectively. In the example shown, the ball bearing 144 directly adjoins one of the spindle nuts 146 on one side and directly adjoins a bracket 148 on the other side, wherein the bracket 148 directly adjoins the other spindle nut 146.

[0054] The motor 121 and the gear unit 122 form, for example, a unit. The motor 121 and the gear unit 122 are configured, for example, as a gear motor unit.

[0055] Figure 4 Shown in detail Figure 2 A schematic cross-sectional view of a spindle bearing 140 of a longitudinal adjuster 106 is shown in FIG.

[0056] Two spindle nuts 146 (also referred to as single nuts) are provided, between which the spindle bearing 140 is disposed. As an alternative, only one spindle nut 146 may be provided instead of two spindle nuts 146, but this is not shown in detail. In this example, the spindle 132 is axially limited in only one direction.

[0057] The corresponding spindle nut 146 is fastened to the spindle 132 and rotates together with the spindle 132 according to arrow 160. The spindle 132 is rotatably mounted in the spindle block 130 and can be axially moved in the longitudinal direction x. The spindle 132 is driven by a drive device 120, in particular a motor 121 (such as Figure 2 and Figure 3 As shown in FIG. 1 , the spindle 132 rotates according to arrow 160. Since the spindle block 130 is fixed, the spindle 132 can rotate along its longitudinal axis in the longitudinal direction x around the spindle axis 138, thereby being able to move linearly or axially. Here, the adjustment direction of the seat track 110 changes with the change of the rotation direction.

[0058] The spindle bearing 140 is preferably configured as an axial bearing 141, which transmits the linear motion of the spindle 132 to the seat track 110 (eg, Figures 1 to 3 shown).

[0059] In the axial direction, the spindle bearing 140 has a ball bearing 144 on one side and a sliding bushing 180 on the other side, which has an axial play 182 relative to the spindle nut 146 , in particular a small compensation region.

[0060] like Figure 4 As shown, the sliding bushing 180 can be arranged in front of the ball bearing 144, as seen from the direction of travel 107. This rearward or rearward arrangement of the ball bearing 144 has a high efficiency of the longitudinal adjuster 106, so that a motor 121 with a small power output can be used. The driver / passenger seat is usually tilted, so the ball bearing 144 configured as an axial ball bearing is mainly loaded via the downhill force.

[0061] As an alternative, the ball bearing 144 can be arranged in front of the sliding bushing 180 in the direction of travel 107 (not shown). In the event of a displacement of the vehicle seat 100, this rearward arrangement of the sliding bushing 180 enables mechanical synchronization of two longitudinal adjusters 106 arranged parallel to each other, in particular two movable seat rails 110 of the two longitudinal adjusters 106 (e.g. Figure 2), as already mentioned in the general description. In embodiments of this type, a motor 121 with a relatively high power output is required.

[0062] The spindle bearing 140 configured as an axial bearing 141 may be arranged not to absorb any radial forces. That is, the spindle bearing 140 may be arranged only as an axial bearing with at least one axial play 182 between the spindle nut 146 and the sliding bushing 180 .

[0063] The corresponding spindle nut 146 is fastened to the spindle 132 so that it cannot rotate. The linear motion of the spindle 132 is indirectly transmitted to the seat track 110 (such as the spindle bearing 140 configured as an axial bearing) via the bracket 148. Figures 1 to 3 ). The spindle bearing 140 is supported, for example, axially and radially against the support 148. Here, the ball bearing 144 is supported only axially against the support 148. The sliding bushing 180 is supported axially against the support 148 via its collar 181 and radially against the support 148 via the cylindrical sliding section 183.

[0064] In particular, the spindle bearing 140 is rotatably mounted on a bracket 148. The bracket 148 is in turn fastened to the seat track 110 in a conventional manner and not shown in detail. Figure 4 As shown, the front region of the track pair 108 can be tilted about 6 degrees relative to the vehicle floor 170 according to arrow 171. The linear movement of the spindle 132 is initiated or caused, for example, by the spindle block 130 (particularly a nut). The spindle 132 is screwed through the spindle block 130. The spindle block 130 is, for example, fixedly connected to the floor track 112, for example, by tightening (such as Figure 2 and Figure 3 shown).

[0065] In order to absorb and dampen or dissipate the acting radial forces, a sliding bushing 180 can be additionally arranged between the corresponding spindle nut 146 and the bracket 148, and the sliding bushing 180 can have a cylindrical sliding section 183, which is provided with a radial clearance 184 relative to the bracket 148. This type of sliding bushing 180, in particular the sliding section 183 of the hollow cylindrical structure with the shaft ring 181, has no prestress in the radial direction and no prestress in the axial direction or longitudinal direction x.

[0066] The linear motion of the spindle 132 is transmitted to the seat rail 110 (eg, Figure 2 and Figure 3 ) and ultimately transferred to the vehicle seat 100, in particular the seat portion 104 (as shown Figure 1 shown).

[0067] A component of the spindle bearing 140, in particular configured as a ball bearing 144, abuts against a bracket 148 on one side and against one of the spindle nuts 146 on the other side, in particular axially against the bracket 148. The ball bearing 144 can in particular be a deep groove ball bearing. The bracket 148 is fastened to a supporting structure or profile of the seat part 104. Seat forces and occupant forces occur mainly in the direction indicated by the arrow 161. The ball bearing 144 comprises, for example, a bearing cage 144.5 and is, in particular, arranged without play between one of the spindle nuts 146 and the bracket 148. An axial suspension device (also called axial spring device, not shown) can optionally be provided. Such an axial suspension device can be used to reduce or eliminate axial play between the spindle nuts 146 and can be designed, for example, so that axial loads occurring in normal adjustment conditions are absorbed by the collar 181 of the sliding bushing 180 (e.g. Figure 4 shown).

[0068] The main shaft bearing 140 is an axial deep groove ball bearing in the thrust direction.

[0069] For example, if the vehicle seat 100, in particular the seat track 110 (eg Figures 1 to 3 As shown in the longitudinal direction x and moving backwards along the longitudinal axis opposite to the direction of travel 107, due to the rearward arrangement of the ball bearing 144, the forces generated between the spindle nut 146 and the bracket 148 are relatively small. Therefore, the sliding bushing 180 located in front of the direction of travel can preferably be used as an axial bearing without the risk of high friction forces. This arrangement ensures an efficient (low-friction) spindle installation. The lateral forces between the spindle 132 and the retaining frame or bracket 148 are generally low. Therefore, the sliding bushing 180 is also sufficient for lateral forces.

[0070] The spindle bearing 140 as a ball bearing 144 comprises, for example, a bearing cage 144.5, in particular two races 144.1, between which balls 144.2 roll. The races 144.3, 144.4 on the two races 144.1 have the same structure; in particular, they have approximately the same size and / or the same shape. One of the races 144.1, in particular the race that rotates together with the spindle nut 146, has a smaller diameter for the spindle 132 than the race 144.1 that is fixedly connected to the bracket 148 and does not rotate. Thus, in the case of simultaneous relative movements, contact and therefore friction losses due to contact can be avoided.

[0071] This assembly will be described in more detail below.

[0072] The spindle bearing 140 , the spindle 132 , and the spindle block 130 with the spindle nut 146 and the bracket 148 may be preassembled to form a preassembled unit 190 .

[0073] For this preassembly, one of the spindle nuts 146, in particular the first spindle nut 146.1, is first screwed onto the spindle 132. The spindle nut 146.1 can have a lead deviation in order to be able to be press-fitted onto the trapezoidal thread of the spindle 132.

[0074] Subsequently, the main shaft bearing 140, the bracket 148 and the sliding bushing 180 are successively mounted on the main shaft 132. The bracket 148 can be configured as a support bracket or a support ring, for example.

[0075] Finally, another spindle nut, in particular the second spindle nut 146.2, is screwed onto the spindle 132, specifically with a small axial play 182 in the axial direction, in particular the longitudinal direction x, in order to reduce the friction between the collar 181 of the sliding bushing 180 and the second spindle nut 146.2. This can be achieved, for example, during the manufacturing process, in particular by tightening or tightening and loosening a defined angle, or by other end stops that only allow installation with play.

[0076] The second spindle nut 146.2 is fixed by an axially pressed fixing bushing 185. It prevents the second spindle nut 146.2 from rotating by friction fit and also centers the second spindle nut 146.2 relative to the spindle 132 to improve coaxiality.

[0077] The pre-assembled unit 190 can be installed into the seat track 110, for example, in the following sequence (eg, Figures 1 to 3 shown):

[0078] The spindle block 130 is screwed into the floor rail 112 (eg Figures 1 to 3 shown).

[0079] The spindle bearing 140 is indirectly connected to the seat rail 110 via a bracket 148. The bracket 148 is, for example, screwed or riveted to the seat rail 110. The hole (not shown) in the bracket 148 can be configured, for example, as a slot in the vertical direction z in order to enable possible tolerance compensation. This type of tolerance compensation can be provided in the transverse direction y.

[0080] In addition, the position of the spindle 132 can be defined by the positioning of the motor 121 and its fastening to the seat track 110 (eg, Figures 1 to 3 shown).

[0081] The axes of the motor 121 and the spindle bearing 140 and the spindle block 130 may be configured to be aligned.

[0082] Terms like "comprising", "having", "containing", "including" etc. used in the claims do not exclude other elements or steps. The use of the indefinite article does not exclude a plurality.

[0083] The features disclosed in the above description, the claims and the drawings may be of significance for implementing the invention in different embodiments either individually or in combination, provided that they remain within the scope of protection of the claims.

[0084] Reference numerals list

[0085] 100 Vehicle seats

[0086] 102 Backrest

[0087] 104 Seat Section

[0088] 105 Seat longitudinal adjustment mechanism

[0089] 106 Longitudinal adjuster

[0090] 107 Direction of travel

[0091] 108 Track Pairs

[0092] 110 Seat Track

[0093] 112 Floor Track

[0094] 118 Cavity

[0095] 120 Drive unit

[0096] 121 Motor

[0097] 122 Gear Unit

[0098] 123 Output shaft

[0099] 124 Fasteners

[0100] 126 Seams

[0101] 128 Internal thread

[0102] 130 Spindle block

[0103] 132 Spindle

[0104] 134 External thread

[0105] 136 Clutch

[0106] 138 Spindle axis

[0107] 140 Spindle bearing

[0108] 141 Axial bearing

[0109] 142 Connecting screw

[0110] 144 Ball bearings

[0111] 144.1 Seat

[0112] 144.2 Ball

[0113] 144.3 Rollerway

[0114] 144.4 Rollerway

[0115] 144.5 Bearing Cage

[0116] 146 spindle nut

[0117] 146.1 First spindle nut

[0118] 146.2 Second spindle nut

[0119] 148 bracket

[0120] 148.1 Through opening

[0121] 150 Common axis

[0122] 160 Arrow

[0123] 161 Arrow

[0124] 170 Vehicle Floor

[0125] 171 Arrow

[0126] 180 Sliding bushing

[0127] 181 Collar

[0128] 182 Axial clearance

[0129] 183 Sliding section

[0130] 184 Radial clearance

[0131] 185 Fixed bushing

[0132] 190 pre-assembled units

[0133] x vertical direction

[0134] y horizontal direction

[0135] z vertical direction

Claims

1. A longitudinal regulator (106), comprising at least: an orbital pair (108), and a drive device (120) for the pair of tracks (108), wherein the track pair (108) comprises a first track and a second track that are displaceable relative to each other, The drive device (120) comprises at least one motor (121), a gear unit (122), a spindle block (130) having an internal thread and fixed to the first track or the second track, a spindle (132) having an external thread (134) operably connected to the internal thread (128) of the spindle block (130), and a spindle bearing (140). wherein the spindle (132) extends along a longitudinal axis and is mounted in the spindle block (130) and the spindle bearing (140) so that the spindle can rotate about a spindle axis (138), The spindle bearing (140) has at least one spindle nut (146) which is fastened to the spindle (132) and rotates therewith. The spindle bearing (140) is configured as an axial bearing (141) which transmits the linear movement of the spindle (132) to the first track, and wherein the spindle bearing (140) has firstly a ball bearing (144) and secondly a sliding bushing (180) in the axial direction, the sliding bushing having an axial play (182) relative to the spindle nut (146).

2. The longitudinal adjuster (106) according to claim 1, wherein: The sliding bushing (180) is arranged in front of the ball bearing (144) as viewed in the direction of travel (107).

3. The longitudinal adjuster (106) according to claim 1 or 2, wherein: The spindle bearing (140) transfers the linear motion of the spindle (132) directly to the first track.

4. The longitudinal adjuster (106) according to claim 3, wherein: The spindle bearing (140) is disposed between the spindle nut (146) and the first track.

5. The longitudinal adjuster (106) according to claim 1 or 2, wherein: The spindle bearing (140) indirectly transmits the linear motion of the spindle (132) to the first track via a bracket (148).

6. The longitudinal adjuster (106) according to claim 5, wherein: The main shaft bearing (140) is rotatably mounted on the bracket (148).

7. The longitudinal adjuster (106) according to claim 6, wherein: The main shaft bearing (140) is arranged between the main shaft nut (146) and the bracket (148).

8. The longitudinal adjuster (106) according to one of claims 5 to 7, wherein: The sliding bushing (180) is arranged between the spindle nut (146) and the bracket (148).

9. The longitudinal adjuster (106) according to claim 8, wherein: The sliding bushing (180) is arranged between the spindle nut (146) and the bracket (148) in an axial and radial direction without stress.

10. The longitudinal adjuster (106) according to one of the preceding claims, wherein In the case of two spindle nuts (146), a spindle bearing (140) configured as an axial bearing is arranged between the two spindle nuts (146).

11. The longitudinal adjuster (106) according to claim 10, wherein: The distance between the two spindle nuts (146) is constant.

12. The longitudinal adjuster (106) according to claim 10 or 11, wherein: The ball bearing (144) is arranged between another spindle nut (146) and the bracket (148).

13. The longitudinal adjuster (106) according to one of claims 5 to 12, wherein: The ball bearing (144) is arranged in a preloaded manner between the spindle nut (146) and the bracket (148) via a spring element.

14. The longitudinal adjuster (106) according to one of claims 5 to 13, wherein: The support (148) has a through-opening (148.1) into which the sliding bushing (180) is pushed, so that an axial play (182) between the sliding bushing (180) and the spindle nut (146) can be set or is set.

15. A vehicle seat (100) having a longitudinal adjuster (106) as claimed in one of the preceding claims.

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