Abstract:
Drive of a seat adjusting device, especially for motor vehicles, with a spindle that is fastened on a first of two rails, which are adjustable with respect to each other, by means of at least one mounting located at the end of the spindle and with a transmission driven by a motor that is mounted on the second rail, whereby the mounting has one part as a base plate, from which two walls at a distance from each other extend upward and that at least one end of the spindle is fastened between these two walls.

Description:
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
       [0001]    No federal government funds were used in researching or developing this invention. 
     
    
     CROSS REFERENCE TO RELATED APPLICATIONS 
       [0002]    This patent application claims priority to European Patent Application 12 191 662.1, filed on Nov. 7, 2012. 
       NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT 
       [0003]    Not applicable. 
       SEQUENCE LISTING INCLUDED AND INCORPORATED BY REFERENCE HEREIN 
       [0004]    Not applicable. 
       BACKGROUND 
       [0005]    1. Field of the Invention 
         [0006]    The invention relates to a drive of a seat adjusting device for motor vehicles with a spindle that is fastened on a first of two rails, which can be adjusted relative to each other, by means of at least one mounting located on one end of the spindle and with a motor-driven transmission that is arranged on the second rail. 
         [0007]    Such a drive is described in EP 1 068 093 B1. The drive is shown in the figure there and in the present  FIG. 1 . As can be seen, a retaining plate  1  on which the seat of the vehicle is to be fastened is assigned to an upper rail  3 . On the retaining plate  1 , mounting links  11  are provided for a motor  2  so that it can be tightly connected to the retaining plate  1  and thus tightly connected to the upper rail. On both sides of motor  2 , drive shafts  21 ,  22  are arranged. Flexible shafts can be used for this. These drive shafts  21 ,  22  produce the connection to a transmission  9  that is described in detail in EP 1 068 093 B1. 
         [0008]    The upper rail  3  glides directly, or over, adjusting and/or bearing elements that are not shown on a lower rail  4  that is fastened on a vehicle floor of the motor vehicle. 
         [0009]    In the functional positions of upper rail  3  and lower rail  4 , these are held by their contact and/or mounting areas so that a hollow space results. Inside this hollow space, a threaded spindle  5  is arranged. This threaded spindle  5  is held by mountings  6   a  and  6   b , which are tightly mounted on the lower rail  4 . For this purpose, the mountings  6   a  and  6   b  have fastener holes  6   e  through which suitable threaded connections or similar fasteners extend and are held on fastener holes  4   a  of the lower rail  4 . The spindle  5  itself is bolted tightly on the mountings  6   a  and  6   b  using suitable fastening nuts  6   c ,  6   d.    
         [0010]    What is problematic in the drive shown in  FIG. 1  is the design of the mountings  6   a  and  6   b.    
         [0011]    These mountings  6   a ,  6   b  designed with an L-shape are ordinarily manufactured as stamped bent parts. In this case, the mountings are first punched out of metal plates as strip-shaped elements and then bent in a right angle. In fact, such stamped bent parts are relatively easy to manufacture and are thus cost-effective. However, the strength of these mountings, which is too low, is a disadvantage. In fact, such stamped bent parts can absorb only limited forces in the case of a crash. In tests, it has been found that such stamped bent parts can handle relatively low forces of up to about 20 kN in the case of a crash. 
       BACKGROUND OF THE INVENTION 
       [0012]    The current state of knowledge is as follows. 
         [0013]    The goal of the invention is to further develop the known drive in such a way that in the case of a crash, higher forces can be absorbed by the mounting or mountings than were previously possible. 
         [0014]    This goal is achieved by a drive as claimed herein. 
       BRIEF SUMMARY OF THE INVENTION 
       [0015]    In a preferred embodiment, a drive of a seat adjusting device, especially for motor vehicles, comprising a spindle that is fastened on a first of two rails, which are adjustable with respect to each other, by means of a mounting located at the end of the spindle and with a transmission driven by a motor that is mounted on the second rail, further comprising wherein the mounting has one part as a base plate, from which two walls at a distance from each other extend upward and that at least one end of the spindle is fastened between these two walls. 
         [0016]    In another preferred embodiment, the drive as disclosed, further comprising wherein the walls have at least approximately half the length of the base plate. 
         [0017]    In another preferred embodiment, the drive as disclosed, wherein the two walls are two longitudinal legs of a U-strap, the base plate has two slots at a distance from each other that run at least approximately concentric to a spindle axis of the spindle and the two longitudinal legs of U-strap are slid from below the base plate through the slots such that a transverse leg of the U-strap is in contact with the underside of the base plate. 
         [0018]    In another preferred embodiment, the drive as disclosed, further comprising wherein the base plate has a recess on its underside, in which the transverse leg of the U-strap engages so the mounting has an at least approximately flat underside. 
         [0019]    In another preferred embodiment, the drive as disclosed, further comprising wherein the base plate, on its upper side, has an elevation that is opposite the recess on the underside of the base plate. 
         [0020]    In another preferred embodiment, the drive as disclosed, further comprising wherein the base plate and the U-strap are tightly connected to each other, especially welded, bonded, toxed or clinched. 
         [0021]    In another preferred embodiment, the drive as disclosed, further comprising wherein the base plate and/or the transverse strap consist of metal, especially steel, sheet steel, metal casting or the like. 
         [0022]    In another preferred embodiment, the drive as disclosed, further comprising wherein the base plate has at least one hole, and such holes, if a plurality, are arranged next to each other seen in the axial direction of the spindle. 
         [0023]    In another preferred embodiment, the drive as disclosed, further comprising wherein the base plate has a rectangular outer contour. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]      FIG. 1  is a line drawing evidencing the drive already explained according to the known state of the art with a spindle fixed at its end by mountings on which a transmission that can move longitudinally rests. 
           [0025]      FIG. 2  is a line drawing evidencing the part of a spindle similar to  FIG. 1 , but with a mounting fastened at one end of the spindle that is designed according to an exemplary embodiment of the invention. 
           [0026]    Each of  FIGS. 3 ,  4  and  5  is a line drawing evidencing a different view of the mounting shown in  FIG. 2 . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0027]    The invention essentially consists in that part of the mounting is a base plate, from which two walls at a distance from each other extend upward and at least one of the ends of the spindle is fastened between these two walls, and preferably welded tightly. 
         [0028]    In a preferred exemplary embodiment of the invention, the walls are aligned concentrically to the spindle axis and are about half the length of the base plate. 
         [0029]    An especially simple embodiment of the mounting according to the invention consists of a design variant, in which the two walls of the mounting are the two longitudinal legs of a U-strap, which run in two slots at a distance from each other that and are at least approximately concentrically to the spindle axis and that these slots are machined into the base plate. In this case, the U-strap is slid from below the base plates with its two longitudinal legs through the base plate in such a way that a transverse clip of the U-strap that connects the two longitudinal legs on their underside is in contact with the underside of the base plate. 
         [0030]    A further development of the invention provides that the base plate has a recess on its underside, in which the transverse leg of the U-strap engages. Because of this, the underside of the entire mounting can have an at least approximately flat underside, so the mounting can rest firmly on a base without tipping. 
         [0031]    Another further development of the invention provides that the base plate has an elevation on its upper side exactly at the point where the recess discussed above is located. 
         [0032]    In this embodiment, the base plate is pressed from its underside with a suitable stamp so the recess is formed on the underside and a corresponding elevation occurs on the upper side of the base plate. 
         [0033]    Another embodiment of the invention provides that the base plate and the U-strap are tightly connected to each other, especially welded, bonded, peened or toxed. Toxing (also called clinching) is understood to mean a joining process for connecting sheet metal and profiles. In this process non-detachable connections are produced using local cold forming without additional and/or fastening parts. The main characteristic of this joining technique consists in that the form-fitting connection is formed from the material of the metal sheets and/or parts to be connected. The known work steps in toxing consist of placement of the parts to be joined between stamp and die and subsequent pressing of the materials to be connected into the die by the stamp. If there is further force build-up, the stamp-side material flows into the die form. As a result, a spot-shaped connection is made without edges or burs. A special advantage of toxing is seen in that outstanding corrosion resistance is maintained for galvanized and painted metal sheets and/or parts, since the protective layer is also included. 
         [0034]    The peening connecting technique that is also possible is a similar process, but its difference from toxing consists in that instead of a spot-shaped connection, a longish, crease-like connection of the metal sheets and/or parts occurs with few sharp edges. 
         [0035]    A further development of the invention provides that the base plate and/or the U-strap consists of metal, especially steel or sheet steel or metal castings. In this case, the base plate and the U-strap can be formed from the same material or from different material. 
         [0036]    For fastening a mounting that is designed in this way for holding one end of the spindle, at least one hole, and preferably two holes, are machined into the base plate. If there are two holes, seen along the spindle axis, the holes lie next to each other in longitudinal direction with respect to the spindle axis. 
         [0037]    Advantageously, the base plate has a rectangular outer contour. 
         [0038]    The significant advantage of such a mounting, which is designed in two parts according to the further development named above, namely with a base plate with slot and a U-strap installed in the slot, consists in that such a mounting is optimized for construction space and also ensures an additional increase in strength for a seat longitudinal adjusting drive. This higher strength occurs with a simultaneous greater stiffness of the mounting and a lower forward displacement. The mounting according to the invention requires only a small installation space, is distinguished by higher strength and can replace previously used mountings without problems. Because of the use of a U-strap, a flexible interface design is ensured with respect to standardization of the adjusting drives. Because of the spacing of the two walls extending from the base plate, various spindle diameters can be considered. Overall, the mounting according to the invention is distinguished by a reduction in manufacturing steps and thus by lower costs. 
       Detailed Description of the Figures 
       [0039]    Referring now to the figures, in  FIG. 2 , similarly to  FIG. 1 , a spindle  5  is shown, but only in the area of one of the two ends of spindle  5 . The remaining components, especially the gear  9  that can be driven on the spindle  5 , are left out in  FIG. 2  for better clarity. 
         [0040]    In contrast to the illustration in  FIG. 1 , the spindle  5  is tightly connected at its end  5   a  with a specially designed mounting  60 , which will be described in more detail in connection with  FIGS. 3 to 5 . 
         [0041]    The mounting  60  has a rectangular base plate of metal, especially of steel or sheet steel or the like. The base plate is provided with the reference number  80  and has, as can be seen from the top view and the side view in  FIG. 3 , two fastener holes  64   a  and  64   b , which are arranged next to each other in spindle axial direction of the spindle  5  and, in fact, in the representation in  FIG. 3 , in the left area of the base plate  80  two slots  82   a  and  82   b  are found that are at a distance from each other and also parallel to the spindle axis of spindle  5 . These slots  82   a  and  82   b  extend over about half, or at least approximately half, of the base plate  80 . 
         [0042]    From the cross section representation in  FIG. 3 , it can be seen that on its right part, the base plate  80  has a recess  83  and opposite on its upper side a corresponding elevation  84 . This recess  83  and the corresponding elevation  84  can be created by a suitable stamping tool, in that the base plate  80  is stamped from the bottom in order to create the recess  83  on the underside and the corresponding elevation  84  on the upper side. 
         [0043]      FIG. 4  shows a second part of the mounting  60 , namely a U-shaped strap  90  that has two longitudinal legs  92   a ,  92   b  lying opposite each other, which on their undersides are connected to a transverse leg  93 . The U-strap preferably consists of metal, especially steel or sheet steel or the like. 
         [0044]    The U-strap  90  is designed in such a way that its longitudinal legs  92   a ,  92   b  can be inserted through the slots  82   a ,  82   b  of the base plate  80  shown in  FIG. 3  so the transverse leg  93  lies in the recess  83  of the base plate  80 . 
         [0045]      FIG. 5  shows the cross section view of the mountings  60  consisting of the two parts, base plate  80  and U-strap  90 , in assembled state and in cross sectional representation.  FIG. 2  shows this mounting  60  in perspective representation, whereby the end  5   a  of spindle  5  is inserted between the two longitudinal legs  92   a ,  92   b  of the U-strap  90  and fastened there is a suitable way. This fastening can occur by welding, for example. As an example, in  FIG. 2  the associated weld seam is indicated between spindle  5  and the inside of the longitudinal leg  92   a.    
       LIST OF REFERENCE NUMBERS 
       [0046]      1  Retaining plate 
         [0047]      2  Drive motor 
         [0048]      3  Upper rail 
         [0049]      4  Lower rail 
         [0050]      4   a  Fastener hole 
         [0051]      5  Spindle 
         [0052]      5   a  Spindle end 
         [0053]      6  Mounting 
         [0054]      6   a  Mounting 
         [0055]      6   b  Mounting 
         [0056]      6   c  Fastening nut 
         [0057]      6   d  Fastening nut 
         [0058]      8  Mounting 
         [0059]      8   a  Fastener hole 
         [0060]      9  Transmission 
         [0061]      11  Mounting link 
         [0062]      21  Drive shaft 
         [0063]      22  Drive shaft 
         [0064]      60  Mounting 
         [0065]      64   a ,  64   b  Holes 
         [0066]      70  Weld seam 
         [0067]      80  Base plate 
         [0068]      82   a ,  82   b  Slots 
         [0069]      83  Recess 
         [0070]      84  Elevation 
         [0071]      90  U-strap 
         [0072]      92   a ,  92   b  Longitudinal legs/walls 
         [0073]      93  Transverse leg 
         [0074]    The references recited herein are incorporated herein in their entirety, particularly as they relate to teaching the level of ordinary skill in this art and for any disclosure necessary for the commoner understanding of the subject matter of the claimed invention. It will be clear to a person of ordinary skill in the art that the above embodiments may be altered or that insubstantial changes may be made without departing from the scope of the invention. Accordingly, the scope of the invention is determined by the scope of the following claims and their equitable Equivalents.