Vehicle seat for a vehicle

Abstract

The invention relates to a vehicle seat for a vehicle, wherein the vehicle seat comprises: a first seat section that is adjustable relative to a second seat section, an adjustment device (9) which is designed to adjust the first seat part relative to the second seat part, an electric motor drive (16) for driving the adjustment device (9), wherein the adjusting device (9) comprises a spindle rod (20), a threaded nut mounted on the spindle rod (20), an outer profile (12) and an inner profile (14), wherein the inner profile (14) is longitudinally adjustable within the outer profile (12) and one of the profiles is connected to the spindle rod (20) and the other profile to the threaded nut (22). The profiles (12, 14) are either closed or open, with sliding bearings (24, 25) provided between the profiles (12, 14).

Description

[0001] The invention relates to an adjustable vehicle seat, in particular for a motor vehicle.

[0002] Vehicle seats generally have a variety of adjustment options. For example, longitudinal adjustment of the vehicle seat is generally provided within the vehicle, particularly via upper rails that are adjusted on lower rails attached to the floor. Furthermore, the seat height of the seat cushion relative to the floor or the rail system can be adjusted, as can, for example, the seat inclination or inclination of the seat cushion relative to the floor or the rail system. Motorized adjustments offer the user greater comfort, but can lead to packaging problems when positioning the electric motor, among other things. Various motorized adjustments are known, e.g., with wobble gears, scissor systems, and spindle drives, in which a threaded nut on a threaded rod or spindle rod is adjusted longitudinally.

[0003] US 2765024 A describes a seat adjustment mechanism with oppositely arranged actuators for longitudinally adjusting the vehicle seat. Each actuator comprises a long tube with a first collar formed with an annular groove. A shaft extends through the first collar into the tube. A thread is formed on the shaft. A coupling means is adjustably received on the thread between the shaft and the first collar. Motorized adjustment of two opposing adjustment devices is provided.

[0004] US 3043551 A shows a vehicle seat adjustment mechanism comprising a base support, a seat support and a pair of spaced seat adjustment means, each pivotally mounted on the base support and the seat support, wherein the pivot axes of one of the adjustment means are formed parallel to each other, and the pair of pivot axes of the other adjustment means are aligned perpendicular to each other.

[0005] DE 100 00 906 C1 discloses a motor vehicle seat with a frame part, which has a spindle drive with a spindle and a spindle nut that interacts with the spindle. The spindle drive engages the frame part and enables different adjustment positions. The spindle is at least partially encompassed by a securing element, which secures the spindle drive against possible buckling of the spindle transversely to the spindle axis in the event of a crash. The securing element is designed, in particular, as a securing sleeve that encompasses the spindle drive over at least part of its length.

[0006] Such adjustments are generally relatively complex and require a corresponding amount of space for the adjustment mechanism and the electric motor drive. Furthermore, the individual elements of the adjustment device must be designed with sufficient strength to withstand the resulting loads, especially bending moments and forces.

[0007] The invention is therefore based on the object of designing an adjustable vehicle seat for a vehicle which enables safe adjustment and high stability with little effort and little installation space.

[0008] This object is achieved by a vehicle seat according to claim 1. The subclaims describe preferred developments.

[0009] Thus, the vehicle seat has at least one motorized adjustment device, which includes a spindle drive with a spindle or threaded rod, a spindle nut mounted on the spindle, and two profiles. The two profiles are nested and adjustable relative to each other in their longitudinal direction by the spindle drive. Plain bearings are provided between the two profiles.

[0010] This creates an adjustment mechanism that is both very space-saving and inexpensive. The two nested profiles enable telescopic adjustment in the longitudinal and axial directions of the profiles, with the spindle preferably being housed in the inner profile, thus enabling a very compact design. A structure is preferably formed with an outer profile, an inner profile housed in the outer profile via the plain bearings, and the spindle housed in the inner profile.

[0011] This design is therefore compact and space-saving, yet can be manufactured at low cost and with little effort. Furthermore, it can absorb high adjustment forces, as longitudinal adjustment of the two profiles relative to each other is provided without, or without, significant moments and bending forces between the profiles. The adjustment device is therefore rigid and essentially requires no additional stiffening elements in addition to the two profiles. The adjustment device can also be connected relatively easily and with little effort by connecting the two seat sections of the vehicle seat to be adjusted to the profiles directly or indirectly via additional means such as joints.

[0012] The electric motor drive is preferably provided outside the profiles and in particular has an electric motor and a downstream gearbox. The profiles can therefore be designed to be sufficiently strong, compact and narrow without accommodating the electric motor. The gearbox preferably enables a suitable reduction in the electric motor. Preferably, a gearbox or a housing of the gearbox device is directly connected to one of the profiles and thus forms a fixed unit, so that a fixed unit is formed from the adjustment device, the gearbox housing and a support, e.g. a cross member, that holds the motor and can be mounted in the vehicle seat on one of the two seat parts to be adjusted. The other of the two profiles can be fastened accordingly to the other seat part, so that suitable adjustments of the seat parts or the like can be achieved by adjusting the length of the two profiles relative to one another.Seat elements can be designed, e.g. a linear adjustment or pivoting adjustment of the seat parts relative to each other.

[0013] The threaded nut mounted on the spindle is advantageously fixed directly, in particular in a form-fitting manner and / or by crimping, in one of the profiles, in particular the outer profile, so that when the threaded spindle is rotated, a translational longitudinal adjustment of this profile together with the threaded nut takes place.

[0014] A further advantage is the simple and secure design of the bearings between the individual parts, especially between the profiles. This eliminates the need for complex ball bearings or roller bearings with additional components and high costs. Due to the direct longitudinal adjustment, with no or no significant bending moments or torsional forces, simple plain bearings can be provided between the profiles. The two profiles can be designed with a suitable fit so that, for example, only one or more plain bearings are provided in a front and one rear bearing point or area, which can safely absorb the forces occurring in the longitudinal direction. Such plain bearings offer cost advantages over ball bearings, as well as ease of assembly and high durability.

[0015] The two profiles can be designed as closed sections, which are thus more rigid and better protect the interior, allowing, for example, the installation of plastic plain bearings; furthermore, open sections can also be provided, which thus require less material and allow better access to the interior.

[0016] The motor, including the motor shaft, can in particular be arranged entirely or substantially perpendicular or orthogonal to the longitudinal axis of the adjustment device and thus perpendicular to the spindle axis. This allows the electric motor, together with the receiving support, to be mounted at a suitable location in the vehicle seat. For example, in a rail system for longitudinal adjustment of the vehicle seat, the cross member, including the electric motor, can be arranged beneath the seat cushion, thus not further compromising the tight installation space in the area of ​​the rail system. For other adjustments, the cross member, including the electric motor, can also be arranged, e.g., beneath the seat cushion or at another suitable location on one of the adjustable seat sections.

[0017] Furthermore, the right-angled connection of the motor with the motor shaft to the adjustment device also enables the creation of a common electric motor for two parallel adjustment devices, which thus enable secure adjustment parallel to one another, particularly on the left and right sides of the vehicle seat. This allows for two parallel adjustment devices with a common electric motor to be provided for all adjustments. This advantageously creates a motor bridge that connects the two parallel and spaced-apart adjustment devices to one another, thus forming a compact unit.

[0018] Alternatively, a single-track solution is also provided, which provides a single adjustment device with exactly one pair of profiles.

[0019] A further advantage lies in the modular design, or the wide applicability of the adjustment device for different adjustments, so that the same or similar adjustment devices can be installed in different places in the vehicle seat.

[0020] The adjustment devices can be used in particular for - Longitudinal adjustment of upper rails relative to lower rails, - Height adjustment or inclination adjustment of a seat cushion relative to the rail system or the top rails, as well as - Adjustment of a footrest relative to the seat cushion.

[0021] Furthermore, the spindle drive enables self-locking adjustment and thus a high level of safety.

[0022] The seat cushion can be adjusted relative to the rail system or the vehicle floor, in particular, by a pair of front adjustment devices and a pair of rear adjustment devices. This arrangement enables, on the one hand, an adjustment of the inclination or pivoting of the seat cushion relative to the rail system by operating the front and rear adjustment devices differently. For example, only the two front adjustment devices can be extended to pivot the vehicle seat backward, and correspondingly only the rear adjustment devices can be extended to pivot the vehicle seat forward. Furthermore, height adjustment is also possible by simultaneously operating the front and rear adjustment devices.

[0023] The invention is explained in more detail below with reference to some embodiments in the accompanying drawings. They show: Fig. 1 a vehicle seat in a basic position in side view; Fig. 2 the vehicle seat in a comfortable position tilted backwards; Fig. 3 the vehicle seat Fig. 1 in a forward-swivelled comfort position; Fig. 4 the longitudinal adjustment of the vehicle seat on lower rails; Fig. 5 the adjustment of a footrest of the vehicle seat; Fig. 6 the adjustment device in the retracted state of the profiles; Fig. 7 the adjustment system with two lateral adjustment devices and central motor according to an embodiment in a perspective bottom view; Fig. 8 the adjustment system Fig. 7 in perspective view; Fig. 9 a section through the adjustment system in the area of ​​the threaded spindle; Fig. 10 a bottom view of the adjustment system with two lateral adjustment devices; Fig. 11 a rear view of the adjustment system; Fig. 12 a longitudinal section through an adjusting device in the retracted state; Fig. 13 a section perpendicular through the longitudinal axis of the adjusting device; Fig. 14 an adjustment system with one motor and only one adjustment device; Fig. 15 a representation of the retracted adjustment device and an exploded representation of the adjustment device. Fig. 16 to 22 show a further embodiment of an adjustment system with two lateral adjustment devices and a central motor in different views; Fig. 16 the adjustment system in perspective view, according to Fig. 8; Fig. 17 the adjustment system in perspective view from below, according to Fig. 7; Fig. 18, Fig. 19 Side views of the adjustment system from Fig. 16, Fig. 17; Fig. 20 the adjustment system Fig. 16 to 19 in bottom view; Fig. 21 a front view of the adjustment system; Fig. 22 a top view of the adjustment system.

[0024] A vehicle seat 1 has several seat parts which can be adjusted relative to one another by different adjustments. Fig. 1 shows the vehicle seat 1 in its basic position, with a longitudinal rail system 2, a seat cushion 3, a backrest 4 and a headrest 5. The Fig. The vehicle seat 1 shown in Figure 1 is basically adjustable in various ways, as described with reference to Fig. 2 to 5. On the one hand, the seat cushion 3 is tilt-adjustable or pivotable relative to the longitudinal rail system 2; for this purpose, two front adjustment devices 6, ie as front feet, and two rear adjustment devices 8, ie as rear feet, are provided between the seat cushion 3 and the longitudinal rail system 2 or the upper rail 2a of the longitudinal rail system 2. In the side views of the Fig. 1 to 5, the right-hand adjustment device 6, 8 is shown in particular. Fig. 2, the vehicle seat 1 is tilted backwards by adjusting the front adjustment devices 6 by pulling them apart telescopically. Accordingly, the vehicle seat 1 is tilted according to Fig. 3 tilted forward by adjusting the rear adjustment devices 8, which in turn are telescopically extended. Accordingly, the height of the vehicle seat 1 can be adjusted by operating both the front adjustment devices 6 and the rear adjustment devices 8, without tilt adjustment or with superimposed tilt adjustment.

[0025] Fig. 4 shows the longitudinal adjustment of the vehicle seat 1, in which the upper rails 2a are adjusted relative to the lower rails 2b mounted on the floor of the vehicle by adjustment devices not shown in detail here, which are provided directly on or in the longitudinal rail systems. Fig. Figure 5 shows an adjustment of a footrest 10 by a separate footrest adjustment device 11, which is provided between the footrest 10 and the seat cushion 3. Thus, a uniform adjustment device 9 can be used for the various Fig. 1 to 5 shown adjustments of the vehicle seat 1 can be used.

[0026] The adjusting devices 6, 8, 11 can be designed according to different embodiments. Fig. 6 to 15 show an adjusting device 9 with an outer profile 12 and an inner profile 14 which is set in the outer profile 12. The profiles 12, 14 are preferably designed as closed profiles and thus have a high degree of rigidity; preferably they can be designed as square profiles as shown. A front slide bearing 24 and a rear slide bearing 25 are provided between the profiles. The adjustment is carried out by means of an electric motor drive which is formed by an electric motor 16 and a downstream gear 18, wherein the gear 18 drives or rotates a spindle rod 20, i.e. a rod with a thread. Advantageously, a gear housing 19 of the gear 18 rests on each side of the respective adjusting device 9, i.e. the gear housing 19 forms a supported gear box. The spindle rod 20 is preferably on ormounted in the inner profile and, with its thread, receives a threaded nut 22 which is received in the outer profile 12. The spindle rod 20 is thus driven by the electric motor 16 and the gear 18 and rotates so that the threaded nut 22, which is firmly received in the outer profile 12, runs longitudinally on the spindle rod 20, whereby the longitudinal adjustment of the inner profile 14 relative to the outer profile 12 is achieved. The threaded nut 22 is firmly received in the outer profile 12, e.g., by form-fitting and / or crimping.

[0027] The spindle rod 20 is received at its rear end in the gear 18, through which it is driven, and further forward it is mounted, for example, in a spindle bearing 23 in the inner profile 14.

[0028] In the Fig. 7 to 12, adjustment systems 7 are shown as bridge designs, in which the central electric motor 16 is accommodated in a cross member 26 and drives two lateral, parallel adjustment devices 9 via two lateral gears 18. The cross member 26 with the electric motor 16, the two laterally projecting motor shafts 17 and the gears 18 can be arranged above or below the adjustment devices 9, as can be seen from Fig. 8 and Fig. 9. According to Fig. 7, Fig. 8, Fig. 10 and Fig. 11, the electric motor 16 can thus act as a motor bridge to drive two adjustment devices 9 on both sides; according to Fig. 14, the electric motor 16 can also drive only one adjustment device 9. Fig. 7 thus preferably shows an adjustment system 7 comprising two adjustment devices 9 and a motor bridge comprising the cross member 26, the electric motor 16, the two laterally projecting motor shafts 17 and the gears 18.

[0029] Fig. Figure 12 shows the connection of the spindle rod 20 with its front thread in the threaded nut 22 of the outer profile 12, and a rear spindle rod receptacle 30 in the gear 18 and thus firmly attached to the inner profile 14, so that these connection points 28 and 30 are adjusted longitudinally relative to each other. The forward and reverse adjustments are thus both motor-assisted, unlike, for example, spring-assisted resets. In principle, a self-locking adjustment is already achieved, since without active rotation of the spindle rod 20, no adjustment of the profiles 12 and 14 relative to each other is possible.

[0030] Fig. 12 and Fig. 13 show the arrangement of the plain bearings 24, 25 between the profiles 12 and 14, as well as the reception of the spindle rod 20 in a rear spindle rod connection 30 and a front spindle bearing 23 in the inner profile 14. The motor shafts 17 driven by the electric motor 16 can in particular be designed as so-called flex shafts.

[0031] Since only longitudinal adjustments occur and no bending moments or lateral forces occur between the spindle rod 20 and the threaded nut 22, simple plain bearings 24 and 25 can be provided. Ball bearings or other more complex bearings for absorbing higher forces and bending moments are therefore not required.

[0032] The cross member 26 with the electric motor 16 and the motor shafts 17 can be provided at suitable locations, e.g., underneath the seat cushion 3, depending on the intended adjustment; the telescopic adjustment devices 9 themselves can be designed to be compact, space-saving, and low-mass.

[0033] The Fig. 16 to 22 show a further embodiment of an adjustment system 7 with two adjustment devices 9, with essentially the same designs as the first embodiment of the Fig. 6 to 19. In particular, the two gear housings 19 of the cross member 26 formed laterally on the cross member 26, which rest on the adjusting devices 9, are designed to be smaller in the vertical direction Z in order to form a narrower packaging in the vertical direction Z. For this purpose, the gear housings 19 are advantageously designed to be longer in the longitudinal direction X, as in particular Fig. 16 and Fig. 22 can be taken.

[0034] Furthermore, a spindle fastening 29 is provided on the lateral, ie in the lateral transverse direction Y outer side of the profiles of the adjusting device 9, e.g. the lower profile of the adjusting device 9.

[0035] Anti-rotation stops 31 are provided on the sides of the adjustment devices 9 to prevent rotation in the event of a crash, as they hold the gear 18 or the gear housing 19 laterally to or in the profile, e.g., as an embossment or elevation (e.g., embossment form).

[0036] Furthermore, anti-rotation stoppers 33 are provided for crash cases, which protrude laterally or in the lateral direction Y outwards from the profiles of the adjustment device 9 and hold the entire gear mechanism and advantageously the entire adjustment system 7 and prevent rotation during the crash.

[0037] Furthermore, in this embodiment, the number of parts or components is advantageously reduced and, in particular, incorporated into a single fixed profile design. List of reference symbols 1 vehicle seat 2 longitudinal rail system 2a Top rail 2b Bottom rail 3 seat cushions 4 backrest 5 Headrest 6 front adjustment device 7 Adjustment system 8 rear adjustment device 9 Adjustment device 10 Footrest 11 Footrest adjustment device 12 outer profile 14 inner profile 16 electric motor 17 Motor shaft, e.g. Flexshaft 18 gearboxes 19 Gearbox housing, especially as lateral support of the cross member 26 20 spindle rod 22 threaded nut 23 spindle bearing 23 of the spindle 20 in the inner profile 14 24 plain bearings between profiles 12, 14 25 plain bearings between profiles 12, 14 26 cross members 28 Thread of the spindle rod 20 29 Spindle fastening 30 rear spindle rod holder, for driving the spindle rod 20 31 anti-rotation stops, anti-rotation tabs 33 anti-rotation stoppers X Longitudinal direction Y transverse direction Z vertical direction QUOTES CONTAINED IN THE DESCRIPTION

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

[0000] US 2765024 A

[0003] US 3043551 A

[0004] DE 100 00 906 C1

[0005]

Claims

[1] Vehicle seat (1) for a vehicle, the vehicle seat (1) comprising: a first seat part (3, 2a) which is adjustable relative to a second seat part (2, 2b), an adjusting device (9; 6, 8, 11) which is designed to adjust the first seat part (3, 2a) relative to the second seat part (2, 2b), an electric motor drive (16, 18) for driving the adjusting device (9), wherein the adjusting device (9) comprises a spindle rod (20), a threaded nut (22) received on the spindle rod (20), an outer profile (12) and an inner profile (14), wherein the inner profile (14) is accommodated in the outer profile (12) in a longitudinally adjustable manner and one of the profiles is connected to the spindle rod (20) and the other profile is connected to the threaded nut (22), characterized by , that between the profiles (12, 14) sliding bearings (24, 25) are provided. [2] Vehicle seat (1) according to claim 1, characterized by in that the electric motor drive (16, 18) has an electric motor (16) and a gear (18) with a gear housing (19), wherein the gear housing (19) is attached to the inner profile (14) and / or the threaded nut (22) is connected to the outer profile (12). [3] Vehicle seat (1) according to claim 2, characterized by that the gear housing (19) and / or the threaded nut (22) are received in or on the profile (12, 14) in a form-fitting manner, in particular by deformation or crimping of the profile (12, 14). [4] Vehicle seat (1) according to one of the preceding claims, characterized by that the plain bearings (24, 25) are provided at a front bearing point and a rear bearing point between the profiles (12, 14). [5] Vehicle seat (1) according to one of the preceding claims, characterized by that the profiles (12, 14) are formed - as closed profiles, e.g. square profiles, in particular for plain bearings (24, 25) made of a plastic, or - as open profiles, especially open square profiles. [6] Vehicle seat (1) according to one of the preceding claims, characterized by that the adjusting device (9) is designed as a concentric arrangement of the outer profile (12), the inner profile (14), the sliding bearings (24, 25) arranged between the inner profile (14) and the outer profile, and the spindle rod (20) with threaded nut (22) arranged in the inner profile (14). [7] Vehicle seat (1) according to one of the preceding claims, characterized by that the electric motor drive (16, 18) with its motor shaft (17) is arranged substantially orthogonally to the profiles (12, 14) and the threaded spindle (20). [8] Vehicle seat (1) according to one of the preceding claims, characterized bythat the adjusting device (9) has exactly one outer profile (12) and one inner profile (14), in particular as a single-track adjusting device, [9] Vehicle seat (1) according to claim 7, characterized by that two parallel adjustment devices (9) are provided, the electric motor drive (16, 18) is accommodated in or on a cross member (26) which runs at right angles to the profiles (12, 14), wherein the cross member (26) forms an adjustment system (17) with the electric motor drive (16, 18) and the parallel adjustment devices (9). [10] Vehicle seat (1) according to claim 9, characterized by that two parallel adjusting devices (9) are provided which are driven by the common electric motor drive (16, 18), wherein the cross member (26) is provided as a motor bridge between the adjusting devices (9), wherein the electric motor drive (16, 18) drives a motor shaft and / or a common motor shaft (17) towards each of the two adjusting devices (9). [11] Vehicle seat (1) according to claim 10, characterized by that the gear (18) between the motor shaft (17) and the spindle rod (20) is formed on both sides by a lateral receptacle of the motor bridge, which is advantageously placed on the lateral adjustment devices (9), in particular their profiles. [12] Vehicle seat (1) according to claim 11, characterized by that indentations or embossments (31) are formed in the lateral profiles, in particular for forming anti-rotation tabs, in particular for fixing the gear. [13] Vehicle seat (1) according to one of claims 9 to 12, characterized bythat anti-rotation stoppers (33) are provided laterally outwardly on the parallel adjustment devices (9), which are arranged in such a way that they prevent rotation of the adjustment system (7) and / or the adjustment devices (9) in the event of a crash, e.g. by stopping on areas of the vehicle or the vehicle seat. [14] Vehicle seat (1) according to one of the preceding claims, characterized by that the adjusting device (9) is provided between - a longitudinal rail system (2), in particular upper rails (2a) of the longitudinal rail system (2), and - a seat cushion (3) of the vehicle seat (1), for adjusting a seat height and / or a seat inclination of the seat cushion (3) relative to the longitudinal rail system (2). [15] Vehicle seat (1) according to claim 14, characterized by that between the longitudinal rail system (2) and the seat part (3) are provided a pair of front adjusting devices (6), and a pair of rear adjustment devices (8), wherein an inclination of the seat cushion (3) can be adjusted by actuating only either the front adjusting devices (6) or the rear adjusting devices (8), and by actuating the rear and front adjustment devices (6, 8) a seat height of the seat cushion (3) can be adjusted relative to the longitudinal rail system (2). [16] Vehicle seat (1) according to one of the preceding claims, characterized by that at least one adjusting device (9), in particular a pair of adjusting devices (9), is provided between upper rails (2a) of a longitudinal rail system (2) and lower rails (2b) of the longitudinal rail system (2) to be fastened to the floor in the vehicle (1), for the longitudinal adjustment of the vehicle seat (1). [17] Vehicle seat (1) according to one of the preceding claims, characterized bythat at least one adjusting device (11), in particular a pair of adjusting devices (11), is provided between a seat cushion (3) and a footrest (10) of the vehicle seat (1), for pivotable adjustment of the footrest (10).

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