DE102006051403B3 - Reclining mechanism for car seat back comprises at least four parallel plates, one plate in each pair being bent so that it contacts adjacent plate and being welded to it at this point, bend in next pair being staggered - Google Patents

Abstract

Reclining mechanism for a car seat back is made up of at least three, preferably at lest four, parallel plates (E1 - E4). One plate in each pair (E12, E23, E34) is bent (K) at one end so that it contacts the adjacent plate. The plates are welded together at this point. The bend in the next pair is staggered from that in the first, so that the welds are staggered.

Description

The The invention relates to a component, in particular for a Vehicle seat, with at least three, preferably at least four interconnected, plate-shaped elements, which to each other at least approximately are aligned in parallel, wherein each element pairs of at least partially adjacent to each other in the area of their investment directly connected to each other, in particular welded.

State of the art

From the international patent application WO 2006/040276 A1 a component according to the invention for a vehicle seat is known. It consists of a stratification of sheet metal contacting, approximately equally thick sheet metal plates, each sheet metal plate is connected to the immediately underlying sheet metal plate to form a pair of plates by laser welding. While the top sheet metal plate is naturally easily accessible to the laser beam acting from above, the welding of the lower-lying plate pairs takes place in each case in the region of recesses in the overlying metal plates, through which the laser steel reaches its point of action.

at small-scale, complex components, such as Lehne inclination adjusters of vehicle seats, the available space for insertion ranges a plurality of such recesses may not be sufficient.

of course is it is also conceivable to manufacture a layered component by that two sheet metal plates are placed one on top of the other and welded, Subsequently, another metal plate placed on this plate pair and welded to the underlying sheet metal plate, and this process is repeated until the desired layer height is reached becomes. In the field of welding However, as a rule, a Schweißwulst, which is laying on the next Metal plate disturbs and therefore previously consuming must be removed.

From the patent application DE 10 2005 001 606 It is known to connect three successive metal plates of different thickness in a train by means of laser welding. However, this procedure requires a special order of the sheet metal plates such that the laser beam occurs on the thinnest sheet metal plate and this welded through the middle sheet metal plate with the thickest sheet metal plate. In addition, the precision in the welding of two sheet metal plates is basically better because of the lower heat input and correspondingly reduced distortion than when joining three metal sheets by means of a single weld.

In the publication EP 0 919 306 A1 Furthermore, the production of a profile body is described with differently profiled sections, which are produced by layering flat superimposed sheet metal layers, which are connected by laser welding. In each case, a sheet metal layer is welded to the underlying sheet metal layer by means of a guided through an opening in the overlying sheet metal laser beam.

task

Of the Invention is based on the object, a plate-shaped and in particular to offer layered components of about the same thickness, where the connection between the elements on the component available space preferably little affected.

solution

The The object is achieved in that in a generic component each at least one element of each element pair one a local, gap-like distance (gap s) to the other element of the same pair of elements has generating crank and the connection to the next Element forming another element pair in the area of this Distance takes place.

To a special embodiment of the invention, the two outer element pairs formed mirror images of each other, wherein the mirror plane in Connecting region of the middle element pair runs. Preferably is the connection between the partially contiguous elements as laser welding educated.

The invention is particularly suitable for use in tilt adjusters for vehicle seats, in particular in wobble gears, which have a first fitting part and a second fitting part which is adjustable in angle relative to the first fitting part. In this case, the middle pair of elements advantageously forms the first fitting part with which outer elements provided with toothings are connected, wherein the outer elements are designed as toothed wheels provided with external toothing, each of which can be brought into engagement with a fitting plate of the second fitting part provided with an internal toothing , A particularly favorable transmission of force can be achieved in that the gears meshing with each other in the design position are either aligned with each other or arranged offset such that a load-induced deformation in the direction of a defined system of the relevant Components takes place.

characters

The Figures represent examples and schematically different versions of the invention.

It demonstrate:

1 a component according to a first embodiment of the invention,

2 a first excerpts shown, inventively designed wobble gear,

3 a partially illustrated wobble mechanism according to another embodiment of the invention.

In the 1 shown component consists of four plate-shaped, mutually substantially parallel elements E1, E2, E3 and E4 made of sheet steel, of which each adjacent elements E1, E2 and E2, E3 and E3, E4 form a total of three element pairs E21, E23 and E34. The thickness d is identical in the exemplary embodiment for all elements E1 to E4.

Each element pair E12, E23, E34 has a first region (denoted A at element pair E34) in which the respective elements (eg E3, E4) abut one another directly and are connected to one another by a weld S. The welding connection of all element pairs E12, E23, E34 takes place by means of laser beam L from one side of the component (in FIG 1 from its upper side), wherein openings O in the upper element pairs E12 and E23 allow the passage of the laser beams L to the underlying element pairs E23 and E34.

At least an element E1 to E4 of each element pair E12, E23, E34 is further with a bend (denoted by K on element pair E34), ie an area in which the plate-shaped Element (here E4) by a first angle (in the embodiment 90 °) from adjacent element (here E3) bent away and then back in the opposite direction is bent back to a substantially same angle. Beyond the cranking K thus arises in each element pair E12, E23, E34 an area in which the elements forming an element pair E12, E23, E34 E1 and E2, E2 and E3 and E3 and E4 are spaced apart like a slit. On element pair E34, this region is designated B with the associated gap dimension s.

As a result of this embodiment, the weld beads W of the weld seams S of an element pair (eg E34) do not disturb an adjacent element pair (here E23), since the weld bead W in question develops into the gap in the region B. In the embodiment according to 1 Moreover, with a correspondingly large training, the openings O create the necessary space. Nevertheless, the gap is helpful to prevent distortion in the lying above the weld elements. Furthermore, the thickness of the welded composite can be set very accurately by compensating executed Köpfungen K even with thickness tolerances of the individual elements.

At the in 2 illustrated, very simplified with discontinuation of numerous components drawn wobble gear 1 O holes O can not be provided because of the very complex structure, so that the area B plays a particularly important role. With regard to the structure and function of such inclination adjuster is expressly to the document WO 2006/040303 A2 directed.

The intended for adjusting the backrest inclination, to a median plane 2 approximately mirror-image executed wobble gear 1 consists of a first fitting part 3 , which is for example rigidly connected to the seat part of the seat in question. The fitting part 3 comprises a middle element pair E23, each having an area A immediate contact with each other and a region B with a distance (gap s) to each other. Between the areas A, B, both elements E2, E3 of the element pair E23 are each provided with offsets K, K 'facing away from each other. The elements E2 and E3 are connected to each other in the area A of the immediate system by a weld S with a weld bead W.

On the element pair E23 further plate-shaped elements E1 and E4 are placed from the outside with the formation of the element pairs E12 and E34, which as externally toothed gears 4 . 4 ' are shaping. The element pairs E12 and E34 are also joined by welds S ', S ".

In the production of the fitting part 3 First, the elements E2 and E3 are welded together. Subsequently, the outer elements E1 and E4 are placed on this composite and connected to the element pair E23.

By the cranks K, K 'are the gears 4 . 4 ' spaced in the region of the weld S of the central element pair E23 to the elements E2 and E3, so that the weld bead W does not interfere with their placement and therefore need not be removed beforehand.

The externally toothed gears 4 . 4 ' are in engagement with fitting plates 5 . 5 ' , Which as lean components are equipped with an internal toothing. The internal teeth each have at least one more tooth than the external teeth of the gears 4 . 4 ' with which she is engaged. The gears 4 . 4 ' can thereby by an operation of the wobble mechanism 1 on the inner circumference of the fitting plates 5 . 5 ' roll off.

The gears of the gears 4 . 4 ' and the fitting plates 5 . 5 ' , which are punched from semi-finished products of the same thickness d, are always in full cover in relation to their thickness d, so that in the unloaded state, the entire material cross-section is used for power transmission. Beyond the internal toothing on the fitting plates 5 . 5 ' in the direction of the fitting part 3 pointing bulges 6 . 6 ' serve the axial guidance. Alternatively, it is conceivable spacers laterally on the fitting part 3 sit up.

In training after 3 are the fitting plates 5 . 5 ' compared to the same in the embodiment, but possibly also different thickness gears 4 . 4 ' slightly, for example 1/5 to 1/10 of its thickness d, in the direction of the median plane 2 offset inwards (offset v), so that no full overlap in the area of the toothing is given. The frictional forces when adjusting the wobble mechanism 1 under normal load conditions are thereby reduced. At a load of the wobble mechanism 1 This offset v causes the fitting plates 5 . 5 ' with their toothed ends inwards in the direction of the fitting part 3 deform until they are at the protrusions 6 . 6 ' and / or additional bends 7 . 7 ' of the fitting part 3 issue. An uncontrolled spreading apart of the fitting plates 5 . 5 ' is thereby prevented.

The wobble gear after 3 is welded in a changed order. First, it is done by the still separate inner plates of the fitting 3 (Elements E2, E3) ago their composite with the fitting plates 5 . 5 ' forming the element pairs E12 and E34 (welds S 'and S''). Subsequently, the element pairs E12 and E34 are placed on each other and outside the fitting plates 5 . 5 ' in the region of the elements E2 and E3 connected to the weld S The Schweißwülste W 'and W''thus have in the distance s of the fitting 3 into it. Another weld S '' connects the elements E2, E3 in the area of the later contact with the bearing sleeve 8th where they lie next to each other by means of further cranks K ", K"'. The laser beam L is for this purpose through a small opening O in the fitting plate 5 ' guided.

The fitting plate 3 This gives it a higher axial rigidity and improved contact with the bearing sleeve 8th ,

d

thickness

E1, E2, E3, E4

elements

E12, E23, E34

element pair

K K ', K' ', K' ''

cranking

L

laser beam

O

opening

s

clearance

S, S ', S' ', S' ''

Weld

v

offset

W W ', W' ', W' ''

weld bead

1

wobble mechanism

2

midplane

3

fitting part

4, 4 '

gear

5, 5 '

fitting plate

6 6 '

protrusions

7, 7 '

fold

8th

bearing sleeve

Claims (9)

Component, in particular for a vehicle seat, having at least three, preferably at least four interconnected, plate-shaped elements (E1, E2, E3, (E4)), which are mutually aligned at least approximately parallel, wherein each pair of elements (E12, E23, (E34) ) are connected, in particular welded, to each other at least partially abutting elements in the region of their abutment, characterized in that in each case at least one element of each element pair has an offset (gap s) to the other element of the same element pair. K ') and the connection to the next element takes place to form a further element pair in the region of this distance. Component according to claim 1, characterized in that the two outer pairs of elements (E12, E34) are mirror images of each other and the mirror plane (median plane 2 ) runs in the connection region of the middle element pair (E23). Component according to Claim 1 or 2, characterized that the connection between the partially adjacent elements (E1 to E4) as laser welding is trained. Component according to one of the preceding claims, characterized in that the component as inclination adjuster, in particular as a wobble mechanism ( 1 ) is formed, which a first fitting part ( 3 ) and a relative to the first fitting part angle adjustable second fitting part having. Component according to claim 4, characterized in that the middle element pair (E23) the first fitting part ( 3 ) is formed, with which toothed outer elements (E1, E4) are connected. Component according to Claim 5, characterized in that the outer elements (E1, E4) are in the form of externally toothed gears ( 4 . 4 ' ) are formed, each with a provided with an internal toothing fitting plate ( 5 . 5 ' ) of the second fitting part can be brought into engagement. Component according to claim 6, characterized in that the respective intermeshing toothings of the gears ( 4 . 4 ' ) and fitting plates ( 5 . 5 ' ) are aligned with each other. Component according to claim 6 in the form of a wobble mechanism ( 1 ) with at least one externally toothed gear ( 4 . 4 ' ) and at least one internal toothed plate ( 5 . 5 ' ), characterized in that each intermeshing toothings of gear ( 4 . 4 ' ) and fitting plate ( 5 . 5 ' ) are aligned axially offset from each other. Component according to claim 8, characterized in that the wobble gear is opposite a median plane ( 2 ) is formed substantially symmetrical and the fitting plates ( 5 . 5 ' ) in relation to the gears ( 4 . 4 ' ) are arranged offset inwards by an offset v such that they undergo a deformation in the direction of the median plane (FIG. 2 ) Experienced.