DE102016001564B4 - Adjusting device for adjusting a vehicle seat, vehicle seat and method for producing an adjusting device - Google Patents

Abstract

Adjusting device (6) for adjusting a vehicle seat (1), wherein the adjusting device (6) has: a first adjusting part (5a), a second adjusting part (4a, 4b) adjustable with respect to the first adjusting part (5a), one on the first adjusting part ( 5a) articulated rack (8) with a toothing (8a), a pinion (10) mounted on the second adjustment part (4a, 4b), which engages with the toothing (8a) and can be rotated for adjustment via a shaft (11) , anda holding device which has a guide for securing the rack (8) to the pinion (10), characterized in that the holding device has a holding clamp (14) designed as a bent sheet metal part which has a bearing area (14d) for mounting the shaft (11 ) or the pinion (10) and from the bearing area (14d) extending support arms (14a, 14b, 14c) for attachment to the second adjustment part (4a, 4b), the guide as a guide surface (18) for sliding contact kt an upper side (8b) of the rack (8) and is designed as a sliding surface on one of the support arms (14a, 14b, 14c) of the retaining clip (14), the retaining clip (14) has a radial tolerance of the toothed rack (8) with respect to the pinion ( 10) or a spring preload in the radial direction in the pinion (10), the retaining clip (14) has three support arms (14a, 14b, 14c), each of which has a fastening area (15a, 15b, 15c) for fastening to the second adjustment part ( 4a, 4b), wherein one of the support arms (14c) is provided for fixing the radial play or the spring preload of the rack (8) with respect to the pinion (10).

Description

The invention relates to an adjusting device for adjusting a vehicle seat, in particular a height-adjustable underframe of a motor vehicle seat, and a vehicle seat with such an adjusting device, and a method for producing such an adjusting device for a vehicle seat.

Such a vehicle seat generally has a seat part that is adjustable in height and / or inclination. The seat part can in particular be longitudinally adjustable, with lower rails to be fastened on the vehicle side and upper rails mounted on these in a slidable manner. The seat part generally has two side parts or side arm parts, which are connected in the transverse direction by, for example, a front and rear cross tube or other structural parts. For this purpose, coupling or swinging, for example swinging that enables parallelogram adjustment, are provided between the seat part and the upper rails. In the case of a configuration that is not longitudinally adjustable, the rockers are correspondingly hinged on their underside not to an upper rail, but to a bearing part on the chassis side.

The user can manually adjust the seat height e.g. B. made by a gear or an adjusting device, which is formed in particular by a lever to be actuated by the user, for example a pump lever, which is provided on the outside of the seat part.

the EP 1 190 891 B1 shows such an adjusting device, which is used to adjust the height of a seat part with respect to the upper rail. Here, a rack is hinged on its underside to a rear coupling and protrudes forward with a toothing formed on its underside, with which it engages a pinion mounted on a side part, which in turn can be rotated via a shaft extending through the side part. The user can thus operate the shaft by means of a lever or pump lever and thereby adjust the rack; Here, a triangle is formed from the rack, coupling and an area of the side part, which can be adjusted according to the adjustment of the rack, whereby the height of the seat part is adjusted.

The rack runs essentially parallel to the inside of the side part and is secured in such a way that it cannot lift off either in the radial direction away from the pinion or in the axial direction of the shaft. For this purpose, an end part designed as a plate is provided as an axial securing device, on which the pinion is mounted, and a bolt is mounted as a radial securing device between the end part and the side part. The bolt, the pinion and the end part thus form a cage through which the rack is guided.

the DE 10 2010 003 718 A1 shows a further adjustment device for seat height or seat inclination adjustment of a vehicle seat with the formation of a rack and a pinion meshing with the rack, in which a rack is also pivotably mounted on a rear coupling and engages at its front end in a pinion and is secured here.

the DE 10 2011 001 638 A1 shows another such system with rack, pinion and fuse.

Also the DE 10 2013 001 416 A1 shows a corresponding adjustment with rack and pinion engagement.

the DE 10 2007 030 139 A1 describes an adjustment drive for moving a functional element in or on a motor vehicle body with a drive motor and reduction gear, in which an actuating element meshes with a drive pinion and is limited in at least one direction of movement by a stop provided in the reduction gear, which is formed at the end of the rack itself and which combs further of the drive pinion blocked.

Adjustments of this kind must provide adequate crash safety, since in the event of a front crash or a rear-end collision, the user together with the seat part is accelerated relative to the vehicle and the rails, and the adjustment device, which also forms the lock between the seat part and the upper rail or chassis, is accelerated accordingly is loaded with high forces.

Furthermore, it turns out that the installation and assembly of such systems is quite complex, for example with attaching a pinion with shaft, inserting a rack and a subsequent attachment, which must allow production-related tolerances and must ensure a firm and secure mounting of the rack , whereby a game should be kept to a minimum.

the DE 100 42 851 A1 describes a height-adjustable underframe of a motor vehicle seat with two side parts which are articulated via a rear and front swivel arm with the associated seat rail of a pair of rails, a blocking arm being provided which is hinged to the associated seat rail with a lower end region at the hinge point of a rear swivel arm and in the vicinity its upper end in one Locking device is releasably set, which is attached to the associated side part.

the DE 20 2013 102 551 U1 describes a motor vehicle seat with a seat part that can be adjusted by means of a handlebar, a bearing plate being provided to secure a toothed pinion.

the KR 10 0 902 320 B1 also describes a height-adjustable vehicle seat.

The invention is therefore based on the object of creating an adjusting device for a vehicle seat, a vehicle seat with such an adjusting device and a method for its production, which enable production with relatively little effort and ensure a high level of safety.

This object is achieved by an adjustment device with the features according to claim 1, a vehicle seat with such an adjustment device with the features according to claim 13 and a method for producing an adjustment device with the features according to claim 14. The subclaims describe preferred developments. The manufacturing method according to the invention is used in particular to manufacture the adjusting device according to the invention.

Thus, a holding device for mounting the pinion and securing the rack is provided, which is essentially formed by a holding clip designed as a bent sheet metal part. The retaining clip here has a bearing area for mounting the pinion and also defines a radial play (free play or free space in the direction of engagement) of the rack with respect to the pinion, which can be minimized in this way and can transition into a spring preload with which a guide surface is attached to a The top of the rack pushes, pushing the rack against the pinion.

Thus, a single component is used at the same time for the axial bearing support of the pinion and the definition of the radial play or free space. The play can thus be minimized up to a spring preload of the engagement of the rack in the pinion.

In this way, on the one hand, an unpleasant rattling and possibly slipping of the rack is reliably prevented. Furthermore, the one-piece design ensures a high level of stability. In particular, this also ensures a high level of crash safety, since the one-piece design on the one hand enables high stability and, even in the event of a frontal crash or rear-end collision, the rack cannot lift off the pinion, but is at most accelerated in the longitudinal direction. Here, a front end, preferably also a rear end, of the rack can be designed with a corresponding thickening so that the rack cannot slip through between the guide surface and the pinion. This thickening can in particular be designed as a collecting opening, for example a curved or concave collecting opening, for catching the toothed pinion.

The retaining clip is designed with contact areas for direct or indirect contact with the second adjustment part, i.e. in particular a side frame of the seat part. In its contact areas or fastening areas, it rests directly on the second adjustment part. In this case, three support arms, each with at least one fastening area, are provided, which are thus fastened to the second adjustment part, that is to say in particular a side frame of a seat part, by means of, for example, three screws.

According to the invention, it is recognized that such a design is very stable due to the connection with three points and enables high tolerances. In particular, two lower support arms with fastening areas can be fastened below the rack and together with the bearing area of the retaining clip already form a stable triangle; The retaining clip then extends upwards with its upper support arm, which is fastened above the rack and pinion and is advantageously also designed or designed directly to determine the radial play or the radial tolerance, up to or including a spring preload.

The guide surface for guiding the rack can be formed directly on the underside of the upper support arm, for example by hardening the sheet steel material, or by an attached slider, for example a clipped or inserted slider made of spring steel, which is highly wear-resistant and hard .

An advantage according to the invention is achieved in particular by the sliding guidance of the rear side or upper side of the rack, instead of, for example, a roller or roller for unrolling. It is recognized that the sliding mount, for example also with a suitable, in particular a large radius of curvature of the guide surface, a secure contact is achieved, the adjustment speeds being so low that no unnecessary frictional heat etc. occurs. Compared to a roller or cylinder, a firmer support with less play is made possible.

In particular, according to the invention, the number of parts is also significantly reduced: instead of an end piece (outer plate) and a bolt rotatably mounted and screwed into the end piece, a one-piece retaining clip with a suitable shape can be placed directly on and screwed tight. This significantly reduces the tolerance chain of several contributing elements or contributors.

It turns out that the one-piece design of the retaining clip ensures sufficient freedom of the parameters to be selected. In this way, the fastening areas with their screw holes can be spaced sufficiently far apart and placed on the second adjustment part to create a high level of stability. In particular, the shape of the upper holding arm with regard to its curvature and its fastening area can be selected so that a large area or a large radius of curvature can be achieved as a contact surface and the radial tolerance of the rack with respect to the pinion is determined by the upper support arm.

In particular, very simple assembly is also made possible:

• - zunächst das Zahnritzel mit der Welle in das zweite Verstellteil gesetzt werden,
• - nachfolgend von oben die Zahnstange auf das Ritzel aufgesetzt werden,
• - dann die Halteklammer so aufgesetzt werden, dass sie mit ihrem oberen Auflagearm auf der Zahnstange liegt,
• - dann die Halteklammer mit ihren unteren Auflagearmen und Befestigungsbereichen in dem zweiten Verstellteil, d.h. dem Seitenrahmen, festgeschraubt werden, und
• - nachfolgend die Anpresskraft ausgebildet und die Halteklammer endgültig fixiert werden, indem der obere Auflagearm mit seinem Befestigungsbereich angeschraubt wird. Bis zu diesem letzten Schritt liegt die Zahnstange noch frei auf dem Zahnritzel auf, so dass die Montage leicht zu handhaben ist.

So can

• - First the pinion with the shaft is placed in the second adjustment part,
• - then the rack is placed on the pinion from above,
• - then the retaining clip is placed in such a way that it rests with its upper support arm on the rack,
• - Then the retaining clip with its lower support arms and fastening areas in the second adjustment part, ie the side frame, are screwed tight, and
• - subsequently the contact force is formed and the retaining clip is finally fixed by screwing the upper support arm with its fastening area. Until this last step, the rack is still free on the pinion, so that assembly is easy to handle.

The assembly thus enables, on the one hand, a simple setting of the tolerances, and still a simple assembly, unlike, for example, when passing a rack through a space between the pinion and the bolt, which are already screwed on.

The rack can also be thickened at the end, e.g. B. be designed with a crash-proof collection opening, since it is not passed through this space for assembly, but is placed before the formation of the space (in the radial direction).

• 1 eine perspektivische, schematische Ansicht eines verstellbaren Sitzteils eines Fahrzeugsitzes;
• 2 eine perspektivische Ansicht des Bereichs der Verstellvorrichtung zur Verstellung der Sitzhöhe;
• 3 einen Schnitt durch die Anordnung aus 2;
• 4 eine geschnittene Vorderansicht gemäß einer weiteren Ausführungsform mit eingesetztem Kunststoff-Gleitelement;
• 5 eine Untersicht auf die Verstellvorrichtung aus 2;
• 6 ein Detailvergrößerung aus 5 gemäß einer Ausführungsform.

The invention is explained below with reference to the accompanying drawings of some embodiments. Show it:

• 1 a perspective, schematic view of an adjustable seat part of a vehicle seat;
• 2 a perspective view of the area of the adjusting device for adjusting the seat height;
• 3 a section through the arrangement 2 ;
• 4th a sectional front view according to a further embodiment with inserted plastic sliding element;
• 5 a bottom view of the adjustment device 2 ;
• 6th an enlarged detail 5 according to one embodiment.

An in 1 Vehicle seat shown 1 has bottom rails to be fastened on the vehicle side 2 , on the bottom rails 2 Slidably mounted top rails 3 and one opposite the head rails 3 adjustable seat part 4th on, this here mainly by a left side part 4a and a right side panel 4b , as well as a front cross bar in general 4c and a crossbar 4d is formed. The seat part 4th (Seat cushion) is via four swing arms, which preferably allow a parallelogram adjustment 5 , 5a on the head rails 3 stored adjustable in height. Here, in principle, adjustments with rockers or links of different lengths are also possible, which, in addition to the height adjustment, also carry out an inclination adjustment.

For height adjustment of the seat part / seat cushion 4th is an adjustment device 6th provided, which can be operated manually here by the seat occupant. The adjustment device 6th has one on the left rear swing arm 5a , which forms a first adjustment part, pivotably articulated rack 8th with a downward-pointing, straight or, for example, slightly convexly curved toothing 8a and one on the left side panel 4a rotatably mounted pinion 10 on that on a wave 11 or as part of a wave 11 is attached, which extends through the left side panel 4a extends, being on the outside of the side part 4a a handle, for example a pump lever device 12th is provided which, for example, the user can repeatedly pivot about the pinion 10 to turn and thereby the adjustment device 6th to adjust.

In principle, the adjustment device is also attached accordingly 6th on the right side part 4b possible.

By turning the pinion 10 thus becomes the rack 8th adjusted in its longitudinal direction, whereby the rack accordingly 8th , the upper part of the swing arm 5a and the rear part of the left side panel 4a formed triangle is adjusted and thereby the left side part 4a at its height opposite the left head rail 3 is adjusted. Basically, the rack 8th for example also directly on the head rail 3 instead of the rear swing arm 5a be hinged.

On the left side part 4a is a retaining clip 14th at three fastening areas 15a , 15b , 15c attached, preferably via screws 16a , 16b , 16c screwed on, here from the inside through suitable receiving holes in the fastening areas 15a , 15b , 15c set and directly in the left side part 4a or screw nuts are screwed in. The retaining clip 14th is designed as a bent sheet metal part and has a central bearing area 14d and from the storage area 14d to the left side part 4a angled mounting arms 14a , 14b , 14c on. In the storage area 14d is a pinion bearing 20th for the pinion 10 or the wave 11 formed, which continues in the left side part 4a is stored. Thus is the pinion 10 between the retaining clip 14th and the left side part 4a stored and recorded.

The rack 8th is on their underside with their teeth 8a in engagement with the pinion 10 ; on their top 8b , which is here in particular planar or flat, it rests on a guide surface in a sliding manner 18th at. The retaining clip 14th sets a radial play of the rack here 8th opposite the pinion 10 fixed, ie the degree of freedom of lifting the rack 8th up from the pinion 10 out. Here, a desired radial tolerance or a system with possibly elastic bracing can be applied to the rack 8th down against the pinion 10 presses to be set. The formation of the sliding surface 18th can on the one hand by hardening the underside of the mounting arm 14c , for example by thermal hardening.

Alternatively, after 6th a slider 22nd , in particular made of spring steel, on the support arm or fastening arm 14c attached or inserted, e.g. B. clipped or locked, which has suitable properties in terms of hardness and abrasion resistance. Thus the rack slides 8th with their top 8b on the guide surface 18th , that means directly on the retaining clip 14th or the inserted slide 22nd .

The one in the upper area of the retaining clip 14th outgoing support arm 14c thus runs from the essentially planar storage area 14d initially angled to the side part 4a down, specifying the tolerance (radial play or spring force) of the guide surface 18th opposite the top 8b the rack 8th , and then comes to rest on the side part 4a In the embodiment shown, it has, for example, an arcuate fastening area 15c on the left side part 4a is present. The precise shaping can in particular take place in such a way that suitable fastening areas 15a , 15c and thus positions of the screws 16a , 16b , 16c for a stable connection is achieved in three fastening areas on the side part 4a are suitably attachable; Furthermore, it is made possible by suitable shaping that a large radius of curvature on the support arm 14c is set via the adjustment path of the rack 8th each enables safe guidance.

The assembly is done by, for example, the pinion 10 with the wave 11 on or through the side panel 4a is set, the pump lever device on the outside 12th attached, and on the inside of the side panel 4a the rack 8th on the pinion 10 is set, and then and finally the retaining clip 14th , if necessary with previously on the retaining clip 14th attached slide 22nd , with the three screws 16a , 16b , 16c is tightened. In particular, the lower screws can be used first 16a and 16b are screwed in, thereby already bearing the shaft 11 and the pinion 10 is ensured. Finally, there is the still free, functionally relevant support arm 14c positioned, with the tolerance or the radial play of the rack 8th and with the top screw 16c is screwed tight without having to position the support arm 14c it is the storage of the pinion 10 has yet to be secured.

It turns out that a very advantageous development of tolerances, forces and adjustment paths is made possible. You can also use the screw holes 19a , 19b , 19c the fastening areas 15a , 15b , 15c the retaining clip 14th larger, and thus designed for better tolerance compensations.

Opposite, for example, systems with a top of the rack 8th supporting bearing bolts, according to the invention, a reduction in the number of parts and thus in the chain of tolerances, furthermore a suitable tolerance up to a preload, can be made possible with a simple design or simple assembly. The play in the radial direction to the pinion 10 can be set very precisely or completely excluded. The one-piece design of the retaining clip also occurs 14th that absorbs the forces, no adjustment of two components; rather, the retaining clip 14th absorb all forces as a one-piece sheet metal part and be designed with a suitable shape and spring action.

It is also recognized here that the multiple functions of the holding chamber 14th , ie on the one hand as a bearing mount for mounting the pinion 10 and continue to support the rack 8th can be combined without problems; already the lower fastening areas 15a , 15b with the support arms 14a , 14b and the storage area 14d for bearing the shaft 11 form a stable triangle; the definition of the tolerance of the rack 8th in the radial direction downwards in relation to the pinion 10 does not affect the axial direction of the pinion 10 or the wave 11 acting bearing function.

The contour of the guide surface 18th of the upper support arm 14c can be chosen suitably, for example convex with a large radius, or flat; it can thus also be designed with a larger radius than when a roller, cylinder or bolt is attached. You can therefore over the entire adjustment path of the rack 8th , which are generally in addition to their longitudinal adjustment with respect to the side part 4a and thus the retaining clip 14th can also perform a pivoting movement, ensure a firm and secure guidance.

The further contouring of the retaining clip 14th can be attached to the side panel 4a or the position of the screw holes 19a , 19b , 19c be adjusted.

By defining the radial tolerance of the rack 8th opposite the pinion 10 In particular, an adjustment path stop can also be achieved; this is the rack 8th advantageously with an end stop 25th , for example as a thickening or as shown as a curved end, the end stop 25th especially as, for example, concave, towards the pinion 10 or downwardly extending surface can be formed. In the event of excessive stress or too great adjustment, in particular as a crash safety device in the event of inadmissibly high forces acting, the seat part can be destroyed and lifted off 4th can be safely prevented as the end stop 25th the pinion 10 can embrace and catch and get stuck on it.

According to a further embodiment, according to 4th a guide piece 30th , for example made of plastic, can be used. The guide piece 30th is in particular Y-shaped or half-open at the bottom, so that there are the axial spaces 32a between the retaining clip 14th and the rack 8th and 32b between the rack 8th and the side part 4a fills out. Through the guide piece 30th there is thus an axial play of the rack 8th suppressed.

List of reference symbols

1

Vehicle seat

2

Under rails

3rd

Head rails

4th

Seat part, seat cushion

4a, 4b

Side part left or right, as a second adjustment part

4c

front cross bar

4d

rear crossbar

5

Swing

5a

left rear swing arm as the first adjustment part

6th

Adjusting device

8th

Rack

8a

Interlocking

8b

Top

10

Pinion

11

wave

12th

Pump lever device

14th

Retaining clip

14a, 14b, 14c

Fixing arms, support arms

14d

middle storage area

15a, 15b, 15c

Attachment areas

16a, 16b, 16c

Screws

18th

Guide surface

19a, 19b, 19c

Screw holes

20th

Pinion bearings

22nd

Slider

25th

End stop

30th

Guide piece

32a

axial gap

Claims (14)

Adjusting device (6) for adjusting a vehicle seat (1), wherein the adjusting device (6) has: a first adjusting part (5a), a second adjusting part (4a, 4b) adjustable with respect to the first adjusting part (5a), one on the first adjusting part ( 5a) articulated rack (8) with a toothing (8a), a pinion (10) mounted on the second adjustment part (4a, 4b), which with the toothing (8a) in Engagement and is rotatable via a shaft (11) for adjustment, and a holding device which has a guide for securing the rack (8) on the pinion (10), characterized in that the holding device is a holding clip (14) designed as a bent sheet metal part has a bearing area (14d) for mounting the shaft (11) or the pinion (10) and support arms (14a, 14b, 14c) extending from the bearing area (14d) for attachment to the second adjustment part (4a, 4b) wherein the guide is designed as a guide surface (18) for sliding contact of an upper side (8b) of the rack (8) and as a sliding surface on one of the support arms (14a, 14b, 14c) of the retaining clip (14), the retaining clip (14) defines a radial tolerance of the rack (8) with respect to the pinion (10) or a spring preload in the radial direction in the pinion (10), the retaining clip (14) has three support arms (14a, 14b, 14c), each of which has a fastening gsbereich (15a, 15b, 15c) for attachment to the second adjustment part (4a, 4b), wherein one of the support arms (14c) is provided to determine the radial play or the spring preload of the rack (8) with respect to the pinion (10). Adjusting device (6) according to Claim 1 , characterized in that the guide surface (18) is designed as a sliding surface on an upper support arm (14c) of the retaining clip (14). Adjusting device (6) according to Claim 1 , characterized in that on the retaining clip (14), preferably an upper support arm (14c) of the retaining clip (14), a slider (22) with the guide surface (18) is attached, preferably clipped or latched. Adjusting device (6) according to one of the preceding claims, characterized in that the upper support arm (14c) of the retaining clip (14) fixes the radial play or the elastic spring tension. Adjusting device (6) according to Claim 4 , characterized in that the upper support arm (14c) is curved, preferably with a convex curvature to the toothed rack (8) to form a guide surface (18) with a convex area or radius area. Adjusting device (6) according to one of the preceding claims, characterized in that two lower support arms (14a, 14b) are provided below the rack (8) and form a triangle with the bearing area (14d), the guide surface (18) above the bearing area (14d) is provided. Adjusting device (6) according to one of the preceding claims, characterized in that the toothed rack (8) has an end stop (25) for an adjustment path of the toothed rack (8) at least at its outer end. Adjusting device (6) according to Claim 7 , characterized in that the end stop (25) is designed as a thickened or curved end, for example a convexly curved end, for embracing or catching the toothed pinion (10) in the event of excessive stress. Adjusting device (6) according to Claim 7 or 8th , characterized in that an end stop (26) for stopping or catching the toothed pinion (10) in the event of excessive stress is also provided at an inner end. Adjusting device (6) according to one of the preceding claims, characterized in that the retaining clip (14) with its fastening areas (15a, 15b, 15c) is placed directly on the second adjusting part (4a, 4b) and is secured to it, for example via in Screw holes (19a, 19b, 19c) set screws (16a, 16b, 16c). Adjusting device (6) according to one of the preceding claims, characterized in that on the side of the second adjusting part (4a, 4b) opposite the pinion (10) a manually operated drive device, for example a pump lever device (12) for repeated actuation by intended for the user. Adjusting device (6) according to one of the preceding claims, characterized in that between the retaining clip (14), the toothed rack (8) and the second adjusting part (4a, 4b), a sliding piece (30), for example made of plastic, is inserted eliminates or defines an axial play. Vehicle seat (1) with an adjustment device (6) according to one of the preceding claims and a seat part (4) which has at least one side part (4a, 4b) as a second adjustment part and is attached to an upper rail (3) or on the chassis side via rockers (5, 5a) is adjustable in height, whereby - the first adjustment part (5a) is one of the coupling, - the rack (8) is hinged at its lower end to the first adjustment part (5a) or the upper rail (3), - the pinion (10) together with the shaft (11) is mounted on the side part (4a, 4b), - The retaining clip (14) is attached to the side part (4a, 4b). Method for producing an adjusting device (6) for a vehicle seat (1), comprising at least the following steps: - inserting a toothed pinion (10) with a shaft (11) into a side part (4a, 4b) of a vehicle seat (1), Rack (8) on the pinion (10), - application of a retaining clip (14) with three support arms (14a, 14b, 14c) forming an axial bearing for the pinion (10) with shaft (11), - fastening of lower support arms ( 14a, 14b) of the retaining clip (14) on the side part (4a, 4b) below the rack (8) and the toothed pinion (10) while fixing the axial bearing of the toothed pinion (10), - applying an upper support arm (14c) of the retaining clip (14) on the side part (4a, 4b) by defining a radial play of the rack (8) or a radial spring preload of the rack (8) with respect to the pinion (10), fixing the upper support arm (14c) of the retaining clip (14) the side part (4a, 4b).

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