Seat system for a row of seats in a motor vehicle

Abstract

In order to provide a structurally simple adjustment mechanism for longitudinal adjustment even in heavy comfort seating systems (2) of a row of seats in a motor vehicle, the seating system (2) has a rail system (4) with at least two rails (6) for longitudinal adjustment, wherein two adjustment drives (26), each with an electric motor (28), are arranged on at least one of the rails (6) offset in the longitudinal direction (L).

Description

The invention relates to a seat system for a seat row of a motor vehicle.Recent developments in multifunctional seating systems, especially for the second row of seats, provide improved comfort functions. Thus, the individual seats are designed, for example, as comfort seats which have a wide range of adjustment and can be moved, for example, into a reclining position. Seat systems of this type require a large adjustment range in the longitudinal direction and are adjusted along comparatively long rails of a rail system.The construction of such seat systems is sometimes complicated because of the long adjustment range, the weight of the seat system, due to the many integrated comfort functions. In particular, the requirements for crash safety must also be fulfilled. As a result, there are high overall requirements for an adjustment mechanism for seat adjustment.DE 10 2020 114 817 A1 discloses a seat system having two vehicle seats arranged side by side, the two actuating drives of which are synchronized with one another.From DE 10 2020 126 987 A1 an adjustable vehicle seat can be seen, in which a respective rail is divided into a pair of partial rails which are offset relative to each other.US 2021 / 0053468 A1 discloses a seat system in which two individual seats are arranged one behind the other on common rails.Proceeding from this, the object of the invention is to specify a seat system for a seat row of a motor vehicle having a simple construction.The object is achieved according to the invention by a seat system for a seat row of a vehicle seat having at least one vehicle seat and preferably having a plurality of vehicle seats arranged side by side, wherein the seat system has a rail system having at least two rails for longitudinally adjusting the seat system in a longitudinal direction. At least and preferably exactly two adjustment drives are arranged on at least one of the rails offset in the longitudinal direction, each of which drives has electric motors for the longitudinal adjustment of the seat system.In addition to the electric motor, a respective adjusting drive also has a drive mechanism via which an ordering movement of the electric motor is transmitted to the at least one longitudinally adjustable vehicle seat and thus to the seat system. In particular, the adjustment drive has a gear. Specifically, a spindle drive is provided, with a spindle nut and a spindle arranged in the respective rail.It should be emphasized that two adjusting drives are arranged on at least one of the rails, offset in the longitudinal direction, each of which drives has its own electric motor. The respective electric motor does not necessarily have to be arranged directly on the rail, but can be connected to the adjusting mechanism via a drive shaft. Preferably, however, each electric motor is also fastened to the rail. The embodiment with the two longitudinally offset adjustment drives on a rail, namely for the seat contact of a seat row, achieves the particular advantage that, on the one hand, the required adjustment forces are divided between a plurality of electric motors and between a plurality of adjustment mechanisms. This simplifies the design in that, for example, predefined current limits for maximum currents in heavy seat installations can be observed. The arrangement of two adjusting drives per rail also leads to a division of the mechanical adjusting forces to be applied between two mechanics. This also serves for improved crash safety, since the crash forces can be transmitted to two adjustment drives. Overall, therefore, it is possible to use standard components even in heavy seat systems, which were developed for example for lighter individual seats-in comparison to the heavy comfort seats which are in the foreground here-without there being any risk of losses with regard to safety or electrical reliability. The installation space available can also be better utilized as a result, since, in comparison with an embodiment variant with only one adjustment drive per rail, the latter would have to be dimensioned correspondingly larger and would therefore locally have a considerable installation space requirement, which is often not available.The seat system is in particular a comfort seat system for a motor vehicle, which is thus mounted in a motor vehicle in the final mounted state. The seat system is designed to transfer the at least one vehicle seat from a normal upright position into a rest position or reclining position. In the reclining position, a backrest is pivoted from an upright position into a reclining position. Preferably, an extendable or fold-out leg rest is also simultaneously attached to the vehicle seat, which can likewise be extended forward in the comfort position.The seat system typically has a plurality of, in particular (exactly) two, seat options arranged next to one another. The seat system is designed exclusively for a seat row, i.e. it comprises only seating possibilities arranged next to one another and does not have vehicle seats arranged one behind the other.In a preferred embodiment, two adjustment drives each with an electric motor for electrical longitudinal adjustment are arranged on two rails of the rail system and preferably exactly on two rails of the rail system. The seat system therefore preferably has exactly four adjustment drives.Alternatively, in a preferred modified embodiment variant, it is provided that two adjustment drives are mounted only on one rail. For reasons of symmetry, in such a seat system, in particular three rails arranged next to one another are provided, wherein only the middle rail is provided with the two adjustment drives and the two outer rails are designed as passive rails without their own adjustment drives.Preferably, the rails are divided in the longitudinal direction and a plurality and in particular two rail parts are arranged per rail. The seat is therefore supported simultaneously on the two rail parts and the adjustment takes place along the two rail parts. Specifically, the seat system is supported with a front sub-region on front rail parts and with a rear sub-region on rear rail parts.The two rail parts are preferably offset relative to one another transversely to the longitudinal direction. They therefore have an offset in the vertical direction (upward or downward) and / or an offset in the transverse direction (lateral). The vertical direction and the transverse direction are oriented with respect to one another and in each case perpendicularly to the longitudinal direction.In a preferred development, the seat system has at least two longitudinal beams which bridge the two rail parts. The respective longitudinal member therefore forms a mechanical bridge between the two separate rail parts. A respective longitudinal member compensates in particular for the offset between the two rail parts, is therefore bent, for example, in the vertical direction and / or transverse direction corresponding to the offset of the rail parts or is formed in some other way in order to bridge the respective offset.In particular, in a preferred embodiment, the seat system has a circumferential supporting frame which has the two longitudinal beams and at least two cross beams which connect the two longitudinal beams to one another. Such a supporting frame, which bridges the rail parts, achieves a high stability for the seat system.Such a supporting frame is preferably also designed in a configuration in which the rails are not divided.Preferably, each individual rail part is assigned at least one and preferably exactly one adjustment drive. This achieves an efficient distribution of the adjustment forces and an arrangement optimized for installation space.The seating system preferably has at least two seating options and preferably exactly two seating options arranged next to one another.According to a first embodiment variant, the seat system is designed as a bench seat, which has at least two seating possibilities. Preferably, each of the seating possibilities is individually adjustable from a normal position into a comfort position. The seat bench therefore has, for example, two separate adjustable backrests and / or two separately extendable leg supports.Alternatively, in a preferred embodiment, two individual seats are arranged, which are arranged jointly on the rail system. In particular, the two individual seats are arranged jointly on the above-described supporting frame.The individual seats are in particular so-called belt integral seats which therefore each have a belt system which is completely integrated into the individual seat, with the result that an additional belt fastening laterally on the vehicle body is not required and is not provided.In a preferred embodiment, the two individual seats are mechanically connected to one another and are thus arranged jointly on the rail system. As a result, the two individual seats can be adjusted in particular synchronously and jointly in the longitudinal direction. The rail system preferably has only a maximum of three and preferably only two rails. The individual seats are thus adjusted jointly along only a maximum of three and in particular along only two rails.The joint adjustability in the longitudinal direction is achieved by the mechanical connection of the individual seats, in particular via the above-described supporting frame or at least via cross members. Therefore, no synchronization between the actuating drives for the rails arranged next to one another is absolutely necessary.The two individual seats are therefore preferably attached to at least one and preferably to a plurality of common cross members which are adjustable along the rails. The cross members are in particular part of the above-described supporting frame.This configuration and the common adjustability achieve in particular a simple longitudinal adjustment and also a weight optimisation and installation space optimisation.Preferably, each individual seat has a plurality of seat elements which are individually adjustable relative to one another. Therefore, at least one further adjustment drive and preferably a plurality of further adjustment drives are arranged, by means of which the various seat elements can be adjusted relative to one another by electric motor. This relates, for example, to an inclination adjustment of a backrest part relative to a seat part, an extension and / or pivoting of a leg rest or a footrest and an adjustment movement for the seat part, which is adjustable, for example, in height, length and / or inclination.The electric motors, in particular for the longitudinal adjustment and / or also those of the further adjustment drives, are preferably designed as so-called BLDC motors (brushless DC motors). The advantage thereof lies in a particularly good and highly accurate controllability, which makes it particularly suitable for the intended purpose of use with the arrangement of a plurality of actuating drives per rail.Exemplary embodiments of the invention are explained in more detail below with reference to the figures. These are shown in partially simplified representations: FIG. 1 shows a perspective illustration of a seat system with two individual seats arranged side by side in a normal position and with individual seats illustrated in dashed lines, FIG. 2 shows the seat system according to FIG. 1, in which the individual seats are in a comfort position, FIG. 3 is a highly schematic representation of a seat system in a plan view with three rails, wherein only two adjustment drives are assigned to the middle rail and wherein the respective rails are divided into two mutually offset rail parts, and FIG. 4 shows a perspective side view of a seat system with rail parts offset with respect to one another.A seat system 2 of a common seat row, which seat system is illustrated in FIG. 1 and in FIG. 2, has a rail system 4 with two rails 6 extending in a longitudinal direction L, which in the exemplary embodiment are each divided into two rail parts 8 arranged one behind the other in the longitudinal direction. Two rail parts 8 each form a pair and are arranged offset with respect to one another transversely to the longitudinal direction L either in the vertical direction V and / or in the transverse direction Q. Typically, they are also offset relative to one another in the longitudinal direction L.The seat system 2 has in the exemplary embodiment exactly two individual individual seats 10. Each individual seat 10 has a backrest part 12 with a headrest 14, a seat part 16 and a foot or leg rest 18. The backrest part 12, the seat part 16 and the leg rest 18 form seat elements which are each adjustable relative to one another, in particular by electric motor. The seat part 16 is preferably additionally adjustable in its inclination and / or in its height. For the inclination adjustment, it is pivotable about a pivot axis, for example (in this regard, see also FIG. 4 ).The two individual seats 10 are fastened together on a supporting frame 20 which has at least two cross members 22 and at least two longitudinal members 24 which connect the two cross members 22 to one another. In particular, the supporting frame 20 is designed in the manner of a box frame. The supporting frame 20 with the longitudinal beams 24 and the cross beams 22 can be easily seen in FIG. 3, the cross beams 22 can be easily seen in FIG. 1, and the longitudinal beams 24 can additionally be easily seen in FIG. 4.As can be seen in particular with reference to FIG. 3 and FIG. 4, the longitudinal beams 24 at least partially compensate for an offset of the rail parts 8 with respect to one another. In the exemplary embodiment according to FIGS. 3 and 4, they compensate for both a transverse offset in the transverse direction and a vertical offset in the vertical direction.As can be seen specifically with reference to FIG. 1, two and preferably exactly two adjustment drives 26 are assigned to each rail 6. Each adjusting drive 26 has its own electric motor 28, which is designed in particular as a brushless direct current motor. A respective adjusting drive 26 furthermore has a drive mechanism via which the adjusting movement exerted by the electric motor 28 is transmitted to the seat system 2. This is in particular a spindle drive. In a configuration not shown in detail here, this typically has a spindle nut and a spindle rod, which are each arranged within a respective rail part 8. A spindle gear is usually arranged on the spindle nut, with a drive wheel, which is designed, for example, as a worm wheel and which is driven, in particular, via the electric motor 28 via a, for example, flexible drive shaft.An embodiment variant with a total of three rails 6 is shown on the basis of FIG. 3, wherein only the middle rail 6 has adjustment drives 26 and the two outer rails 6 are designed as passive rails in contrast.In contrast, in the embodiment variant according to FIG. 1 and FIG. 2, only one common rail pair with the two rails 6 is provided. In contrast to the variant embodiment of FIG. 3, the middle rail 6 is therefore omitted.The two adjusting drives 26 per respective rail 6 are in this case divided in particular between the two rail parts 8. That is to say, each rail part 8 is assigned an adjusting drive 26 (exactly).On the basis of the highly schematic illustration according to FIG. 4, some displacement movement of the individual seat elements relative to one another is indicated. Thus, for example, a pivot axis A 1 is shown, about which the backrest part 12 can be pivoted relative to the seat part 16 in its inclination. Furthermore, it is shown that the inclination of the seat part 16 can be pivoted about a further pivot axis A 2. In the exemplary embodiment, the backrest part 12 and the seat part 16 are each pivotably attached to the support frame 20 and in particular to the longitudinal member 24.List of reference characters2 Seat system 4 Rail system 6 Rail 8 Rail part 10 Individual seats 12 Backrest part 14 Headrest 16 Seat part 18 Leg rest 20 Supporting frame 22 Cross member 24 Longitudinal member 26 Adjusting drive 28 Electric motor L Longitudinal direction V Vertical direction Q Transverse direction A 1, A 2 Pivot axisReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2020 114 817 A1

[0004] DE 10 2020 126 987 A1

[0005] US 2021 / 0053468 A1

[0006]

Claims

Seat system (2) for a seat row of a vehicle having at least one vehicle seat, having a rail system (4) having at least two rails (6) for longitudinally adjusting the seat system (2) in the longitudinal direction (L), wherein two adjusting drives (26) each having an electric motor (28) are arranged on at least one of the rails (6) offset in the longitudinal direction (L).Seat system (2) according to the preceding claim, wherein two adjustment drives (26) each with an electric motor (28) for electrical longitudinal adjustment are arranged on two rails (6).Seat system (2) according to claim 1, wherein the rail system (4) comprises a middle rail (6) and two outer rails (6), and only the middle rail (6) is provided with adjustment drives (26).Seat system (2) according to one of the preceding claims, wherein the rails (6) are divided in the longitudinal direction (L) and a plurality of rail parts (8) are arranged per rail (6).Seat system (2) according to the preceding claim, wherein the two rail parts (8) of a respective rail (6) are offset with respect to one another transversely with respect to the longitudinal direction (L).Seat system (2) according to one of the two preceding claims, which has at least two longitudinal beams (24) and in particular at least one supporting frame (20) with the two longitudinal beams (24) and two cross beams (22), wherein the longitudinal beams (24) bridge the two rail parts (8).Seat system (2) according to one of claims 4 to 6, wherein each of the total of at least four rail parts (8) is assigned an adjusting drive (26).Seating system (2) according to one of the preceding claims, which is designed as a bench seat.Seat system (2) according to one of Claims 1 to 7, which has a plurality of, in particular two, individual seats (10) which are designed specifically as belt integral seats, the individual seats (10) being arranged jointly on the rail system (4).Seat system (2) according to the preceding claim, wherein the two individual seats (10) are mechanically connected to one another and are therefore adjustable jointly in the longitudinal direction (L), wherein the rail system (4) preferably has only a maximum of three and preferably two rails (6).Seat system (2) according to one of the two preceding claims, wherein the two individual seats (10) are mounted on common cross members which are adjustable in the longitudinal direction (L) along the rails (6).Seat system (2) according to one of claims 9 to 11, wherein each individual seat (10) has a plurality of seat elements (12, 14, 16, 18) which are individually adjustable relative to one another.Seat system (2) according to one of the preceding claims, brushless direct current motors being used for the electric motors (28).Seat system (2) according to one of the preceding claims, wherein the adjustment drives (26) are each designed as spindle drives.

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