DE202006001256U1 - Load e.g. passenger, measuring arrangement for motor vehicle seat, has strain gauge detecting deformation of gear housing depending on load that acts on seat, and emitting electrical signal corresponding to measured load - Google Patents

Abstract

The arrangement has a vehicle seat, which comprises of a seat bottom part, backrest, seat pan (5) and seat frame-side parts (6) that are adjustable relative to each other, and an adjusting device for adjusting the seat position. The adjusting device has a gear connected with the seat parts, and a gear housing for accommodating the gear. A strain gauge (8) is attached at the gear housing and is designed to detect the deformation of the gear housing depending on the load that acts on the vehicle seat. The gauge emits an electrical signal corresponding to the measured load. An independent claim is also included for an arrangement for evaluating a load that acts on a vehicle seat.

Description

Territory of invention

The The present invention relates generally to weight detection Motor vehicle seats and in particular relates to an arrangement for Detection and an arrangement for evaluating a on a motor vehicle seat acting strain.

background the invention

electrical powered weight sensors are used in vehicle seats for detection a seat occupancy based on the weight of one on the corresponding Vehicle seat seated person used. By recognizing a Seat occupancy can different functional groups of a motor vehicle in dependence be controlled by the seat occupancy, for example an automatic movement and / or weight-dependent Adjustment of certain seat components and the movement and / or weight-dependent release an airbag module. The integration of weight detection sensors in motor vehicle seats usually requires a comparatively high effort.

An example of a seat assembly having such a weight detection sensor is shown in FIG DE 10 2004 006 051 A1 the applicant discloses. In this seat assembly, the weight detection sensor is provided at a bearing point of a parallelogram suspension of the vehicle seat. More precisely, the seat assembly comprises an adjusting device for adjusting an adjustable part of the motor vehicle seat, for example a seat shell. The weight sensor has a base body provided with an external thread, in which the sensor components required for generating a weight-dependent sensor signal are arranged, as well as a projecting from the main body in the axial direction bearing pin, which projects into the interior of a drive tube, which forms the lower axis over an adjusting lever of the parallelogram suspension is pivotally hinged to the seat upper rail of the rail longitudinal guide.

One such weight sensor requires significant structural adjustments on the seat assembly. This increases the manufacturing and assembly costs and the maintenance significantly. changes on the construction of the seat assembly can can not be done in a simple way, without the accuracy to affect the weight detection.

Summary the invention

task The present invention is an arrangement for detection to provide a load on a vehicle seat, in the case of a comparatively simple construction of the seat assembly ensures sufficient accuracy of weight detection is and yet is designed so that constructive changes can be made to the seat assembly in a simple manner. According to one Another aspect of the present invention is further a Arrangement for the evaluation of acting on a motor vehicle seat Loads are provided.

These and further objects are according to the present Invention by an arrangement for detecting a on a motor vehicle seat acting load according to claim 1 and by an arrangement for evaluating a load acting on a motor vehicle seat solved. Further advantageous embodiments are the subject of the referenced Dependent claims.

Consequently The present invention is based on a seat assembly, the two relatively adjustable seat parts and an adjusting device for Adjusting a seat adjustment includes. In this case, the adjusting device a drive means, for example a stationary, in particular non-rotatable, Spindle or a fixed rack connected to a first of two seat parts which are adjustable relative to one another are fastened, and a transmission that is adjustable with the second of the two relatively adjustable Seat parts is connected, and a transmission housing for receiving the transmission. Draws according to the invention The arrangement is characterized by a sensor attached to the transmission housing is and is designed to prevent deformation of the gear housing dependence to detect the load acting on the vehicle seat and in accordance with the detected load, an electrical signal issue.

Consequently The present invention finds application in a wide variety different seat assemblies, for example, by a precise one Adjusting the seat adjustment without causing tension, by a backlash-free, protected from contamination storage of the transmission elements, by a crash-proof connection of the transmission elements and optionally distinguish other advantageous properties. Because the sensor according to the invention on the gearbox is appropriate, are not significant structural changes the components of the seat assembly required, but rather conventional standard components continue to be used.

According to the invention Sensor designed to allow deformation of the gearbox under load to capture and output a corresponding electrical signal. To operate the sensor and / or to output the electrical Signals can in principle already existing electrical supply lines to the drives the adjusting devices are used or are at best complementary electrical Supply lines based on existing supply lines with low supply To integrate effort.

According to one another embodiment the sensor is designed as strain gauges or strain gauges, which is mounted directly on the transmission housing, preferably by an adhesive bond. As is known, strain gauges make themselves use physical properties that allow a change in length directly into a change to transform an electrical resistance. Usually is or are in a strain gauge on an insulating carrier foil one (or more) track (s) placed in bays so that The resulting from the resistivity of the conductor length and the conductor cross-section resulting ohmic resistance, changes with a change in length. Surprisingly it is based on the invention complicated series of experiments proved that directly on the gearbox mounted strain gauges using an appropriate evaluation for one can provide sufficiently accurate weight detection, in particular for Recognition of seat occupancy or weight distribution or Center of gravity displacement on the seat, as described in more detail below explained. When attaching the strain gauge to the transmission housing is on a full-surface Contact of the sensor back pay attention to the case surface, which basically also by other joining techniques than an adhesive bond can be realized.

According to one another embodiment further measures taken to disturbances, like for example, temperature changes, to eliminate as much as possible in the weight detection. To this Purpose can according to a another embodiment another strain gauge may be provided, the two Strain gauge over a Wheatstone's bridge are switched so that the one strain gauge actively the deformation of the gearbox in a resistance change reacted as described above, and the other strain gauge to suppress of disturbances serves. For compensation, the Wheatstone bridge circuit can in particular a calibrated fixed resistor and a continuously adjustable potentiometer have, where fundamentally different suitable compensation measures can be used as will be apparent to those skilled in the art.

According to one another embodiment includes the transmission housing Side walls, the static forces absorb, in particular from acting on the vehicle seat Weight force, as well as side walls, the predominant or exclusively dynamic forces record, especially in the seat adjustment. According to this further embodiment the sensor is useful on a Sidewall of the gearbox housing appropriate, exclusively, in any case, predominantly, static absorbs forces acting on the vehicle seat. Because dynamic personnel Thus, essentially not be detected, according to the invention an associated Evaluation are easier to design and / or can Accuracy of weight detection even with simple evaluation means guaranteed become.

Basically the gearbox have any suitable structure that provides a precise, tension-free and play-free adjustment of the seat adjustment allows. In addition can the gearbox also for a crash-proof connection of the transmission elements are designed. Thus, according to the invention is basically a size Variety of differently designed gearbox types for deployment the inventive arrangement into consideration.

According to a preferred embodiment, the transmission housing consists of two plug-in bearing plates, which can be connected to one another and attached to the second of the relatively adjustable seat parts. Such a gear housing type is for example in the DE 102 50 994 A1 the applicant discloses, the content of which is hereby expressly incorporated by reference for disclosure purposes in the present application. Such a gear housing structure allows a backlash-free, protected from contamination storage of the transmission elements, a crash-proof connection of the transmission and thus the adjustment and a pivotable about at least one axis bearing if necessary, the transmission.

at such an embodiment can they Bearing plates in particular U-shaped be formed, with side legs and connecting them together Connecting legs, wherein the sensor on one of the connecting legs is appropriate. Such U-shaped Trained bearing plates react in the region of the connecting legs advantageously sensitive to loads acting on the vehicle seat, which results in readily detectable deformations in the area of Advantageously reflecting connecting leg.

there can the connecting leg through holes to carry out the Drive means, such as a spindle or rack, have and the sensor is preferably immediately adjacent to one of Through openings appropriate. In this area, so have elaborate series of experiments shown, lead on the vehicle seat loads acting on deformations, the in an advantageous simple and accurate manner by means of a sensor, such as a strain gauge, can be detected. To this advantageously high sensitivity like the asymmetry of the connecting leg near the connection opening contribute. The sensitivity can be further enhanced by convex design of surfaces of the gearbox increased in the coverage area become.

According to others embodiments can the adjustment for a seat height adjustment or be designed a seat tilt adjustment. Suitable embodiments will be explained in more detail below described. According to one another embodiment can the chosen one Seat adjustment also a height and tilt adjustment using multi-joint kinematics enable. In such multi-joint kinematics by means of levers side parts and seat pan of the vehicle seat within a defined range simultaneously or coordinated adjusted. The kinematic positions the levers cause corresponding forces or Moments around the fulcrums counteracted by a counterforce so the system vehicle seat is in balance. At a Such a multi-joint kinematics is the height adjustment serving spindle loaded with a compressive force, resulting in a corresponding counterforce which results on the height adjustment spindle acts and becomes the tilt adjustment spindle loaded with a compressive force, the corresponding counterforce on the tilt adjustment spindle is assigned. These opposing forces lead to Deformations on the corresponding gearbox housings, which according to another embodiment be evaluated by means of two strain gauges and fed to another calculation.

According to one another embodiment the arrangement further comprises a sensor for detecting a Position of the gearbox in relation to the associated drive means, for example the fixed spindle or rack. Such a position detection sensor For example, as a Hall sensor on an output shaft of a Drive motor or as a Hall IC in the brush system of a drive motor be educated. In this embodiment, from the position of the gearbox and from acting on the drive means, in particular the spindle weight-dependent Counterforce (as indicated by the deformation of the gearbox housing) to the actual to be deduced on the vehicle seat weight acting force. To this Purpose may be an evaluation, for example, a processor or a CPU, which is basically also a memory with associated with a reference table for storing reference data may be that an assignment of each acting weight the detected position of the transmission housing and the detected weight-dependent counterforce, such as indicated by the deformation of the transmission housing allows.

According to one another embodiment The accuracy of the arrangement is determined by detection and evaluation additional Parameters increased, in particular of deformations of components, in particular of components the seat assembly. For this purpose, an additional sensor may be preferred the same design as the sensor of the detection arrangement, in particular designed as strain gauges, for detecting a deformation a different area of the vehicle seat than provided on the transmission housing be with the other area being chosen so that the on the vehicle seat acting stress also to a deformation at the other area leads.

The Evaluation of a further deformation at another area allows additional conclusions on actually acting loads, which further increases the detection accuracy leads. For signal evaluation can in particular a reference table be accessed, in the determined from experimental series or analytically calculated reference data are stored, so that by comparison the actual determined deformations with the reference data even more precise actually on the vehicle seat load can be closed.

The arrangement described above can also be used according to a further aspect of the present invention for the evaluation of loads acting on a vehicle seat. By coupling with an evaluation unit, for example a processor or a CPU, it is possible in particular to infer an overload, a crash or a plastic deformation on seat components lying in the power flow of the vehicle seat. In particular, it is possible in this way to distinguish between minimal plastic deformations and plastic deformations which make further use of the vehicle seat impossible. For this purpose, the evaluation unit can in particular also evaluate the time profile of the measured deformations on the transmission housing. This time course can be continuously recorded or interposed stores and evaluated accordingly.

Consequently concerns another general aspect of the present invention Invention also method for detecting acting on a motor vehicle seat Loads, as well as their evaluation, in particular also for the determination of plastic deformations of seat components.

LIST OF FIGURES

following the invention will be described by way of example and with reference on the attached Drawings are described, resulting in more features and Advantages to be solved Tasks will result. Show it:

1 in a perspective bottom view of an inventive arrangement in a seat tilt adjustment;

2 in an enlarged perspective view of the connection of the drive motor and the transmission to the seat tilt adjustment according to the 1 ;

3 the unit formed by drive motor and gear housing according to the 1 in a further enlarged view;

4 in a schematic side view of a vehicle seat with a Sitzhöhenverstelleinrichtung;

5 in a perspective rear view of the seat height adjustment according to the 4 ;

6 the unit formed by the drive motor and gear housing the seat height adjustment according to 4 ;

7 in a schematic side view of a vehicle seat with seat height adjustment and seat tilt adjustment according to the present invention;

8th the position of a strain gauge for detecting an additional deformation parameter in a seat height adjustment according to another embodiment of the present invention;

9a in a perspective bottom view of the position of a detection of an additional parameter serving Dehnmessstreifens near the seat upper rail of a seat longitudinal adjustment according to another embodiment of the present invention;

9b in a perspective plan view of the position of a detection of an additional parameter serving Dehnmessstreifens near the seat bottom rail of a seat longitudinal adjustment according to another embodiment of the present invention;

10a an arrangement for detection and / or evaluation according to a first embodiment of the present invention; and

10b an arrangement for detection and / or evaluation according to a second embodiment of the present invention.

In the figures denote identical reference numerals identical or essentially the same elements or functional groups.

Full Description of preferred embodiments

According to the 1 is the seat shell part 5 over a hinge pin 51 in the area of the joint section 50 pivotable on a seat frame side panel 6 stored. The seat frame side panel 6 itself is over the lever 61 and the connecting bolt 65 pivotally mounted on the with the top of a seat upper rail of a seat longitudinal adjustment (see. 9 ) pivotally mounted on the seat upper rail. The inclination of the seat shell 5 and thus the seat tilt can be over the through the connecting rod 52 , the pivot lever 53 and the bolt 54 adjust adjusting mechanism formed. To drive the seat tilt adjustment is a spindle drive. The spindle drive has an electric motor 2 on, whose motor shaft is connected to a drive worm, which meshes with a worm wheel of a transmission. The worm wheel is connected to a spindle nut, whose thread is connected to the thread of the spindle 4 combs. A rotation of the motor shaft is transmitted in the known manner via the drive worm on the worm wheel and thus on the spindle nut connected to the worm wheel, so that when rotatably arranged spindle 4 this changes its position in relation to the motor shaft by the rotation of the spindle nut, that is in the 1 depending on the direction of rotation of the electric motor 2 is moved forward or backward in the longitudinal direction of the seat frame side member.

The gear elements drive screw, spindle nut and worm wheel are combined in a transmission, which is housed in a gear housing, which according to the 3 through two connecting legs 31 . 33 , the side legs 30 and a further side leg opposite thereto is formed and is generally cuboidal. According to a preferred embodiment, the transmission housing 3 as in DE 102 50 994 A1 described, whose content is hereby incorporated by reference for disclosure purposes explicitly in the present application.

As a result, the transmission housing 3 be formed of two U-shaped or clamp-shaped bearing plates, in the in the 3 shown manner are interlaced. In this training, the spindle passes through 4 one in the connecting legs 31 . 33 trained passage opening 32 , The rear end of the spindle 4 is in a spindle receptacle 40 taken over a connecting bolt 41 with the adapter plate 42 connected according to the 1 and 2 on the inside of the seat frame side part 6 is attached. According to the 2 is the top of the gear housing via an adapter plate 36 with the underside of the seat pan 5 , in particular the connecting rod 52 , connected. A change in the position of the spindle 4 in relation to the motor shaft of the electric motor 2 thus leads to an upward or downward pivoting of the seat 5 and thus to an adjustment of the seat tilt.

According to the 2 and 3 is the gearbox 3 formed substantially closed, which allows a largely backlash-free and secured against contamination storage of the transmission elements. As more detailed in the DE 102 50 994 A1 described, can be ensured with the inventively preferred embodiment of the spindle drive a pivotable about at least one axis bearing the transmission if necessary. According to the 3 is the gearbox 3 laterally by a connection bracket 20 completed the electric motor 2 over bolt 21 to the gearbox 3 connects.

According to the 3 act on the connecting legs 31 . 33 of the gearbox 3 essentially only static forces resulting from a weight force acting on the vehicle seat, while on the lower side legs 30 and the associated upper side legs (not shown) are substantially predominantly dynamic forces. According to the invention on the outside of the substantially only static forces receiving side wall 31 of the gearbox 3 a strain gauge 8th attached, which deformations near the passage opening 32 detected. Again 3 can be removed without further notice, the connecting legs 31 . 33 near the passage opening 32 slightly convex outward curved, reflecting the sensitivity of detecting a deformation of the gear housing 3 increased in this area advantageous. Due to the convex elevation of the surface profile in the detection area of the strain gauge 8th In particular, its elongation is exaggerated when acting on the vehicle seats weight forces in comparison to a flat housing wall. This further increases the measuring accuracy.

The 4 shows a vehicle seat with a seat height adjustment. In this case, a parallelogram suspension is used by the pivotable on the rear bearing block 64 stored rear lever 62 and the one on the front bearing block 63 pivotally mounted adjusting lever 61 is formed, each to the seat frame side panel 6 are articulated. According to the 5 is the non-rotatable spindle 4 over the gearbox housing and the adapter bracket 35 to the seat frame side panel 6 tethered, with the rear end of the spindle receptacle 40 at the protruding end of the adjusting lever 62 hinged, which is its fulcrum on the rear bearing block 64 Has. An adjustment of the spindle 4 relative to the motor shaft of the electric motor 2 in the manner described above leads to a pivoting of the adjusting lever 61 . 62 and thus to a change in the seat height while at the same time substantially unchanged seat tilt.

According to the 6 is the gearbox 3 basically comparable to the one based on 2 and 3 formed gear housing. Thus, at the connecting leg 31 adjacent to the passage opening 32 a strain gauge 8th attached, which is a deformation of the substantially static forces receiving connecting leg 31 detected at acting on the vehicle seat weight forces or loads.

The 7 shows a further embodiment of a vehicle seat according to the invention with a seat height adjustment and a seat tilt adjustment, in which the detection of the deformation of the respective gear housing is basically in the manner described above.

The following is based on the 10a a weight detection method according to a first embodiment of the present invention will be described. It is assumed that a vehicle seat, the backrest 101 and seat base 100 by means of separate adjusting motors 2 can be adjusted independently. The respective deformation of the associated gearboxes is by means of respective strain gauges 8th detects their electrical signals via an analog / digital converter in an evaluation 70 which are a processor or a CPU 71 and a memory 72 with a reference table stored therein. The reference table stores, for example, reference data values derived from test series or analytically calculated, which contain the respective values detected deformations, such as the electrical signals of the strain gauges 8th displayed assigns a defined weight by the processor 71 is calculated by comparing the detected electrical signals with the reference data of the reference table. As will be readily apparent to those skilled in the art, the amount of deformation on the sidewall of the transmission housing will depend on a variety of parameters, such as the location of the measurement, the structural design of the transmission housing and the adjustment mechanism and the resultant force flow, of the material properties the components of the seat adjustment and the like. With a known characteristic curve of the strain gauge, the electrical signal could basically be calculated in advance on the basis of the seat adjustment properties and in the reference table 72 be filed. Appropriately, however, the reference data from test series are determined, at least matched to the results of such test series, based on a same interpretation of the seat adjustment.

For further suppression of disturbances, such as temperature changes, a respective strain gauges may be assigned to a further strain gauges, which are connected together via a so-called Wheatstone bridge circuit so that the one strain gauge actively converts the deformation of the gear housing in a resistance change, the is then evaluated, and that the other strain gauge is used to suppress disturbances, in particular temperature changes. For this purpose, the Wheatstone bridge circuit in the known manner, for example, have a calibrated fixed resistor and a continuously variable potentiometer. In this way not only unwanted disturbances can be suppressed but can also be a calibration of the sensitivity of the active strain gauge 8th be accomplished.

According to a further embodiment, a further sensor for detecting the position of the spindle of the seat adjustment is provided on the seat adjustment. Such a sensor can be realized for example as a Hall sensor, which detects a rotational position of the output shaft of the electric motor. In particular, such a position detection can also be realized by means of a Hall IC in the brush system of the electric motor. In such an embodiment, the strain gauge thus measures 8th acting on the spindle of the seat adjustment weight-dependent counterforce (as indicated by the deformation of the transmission housing) and measures the other sensor, the position of the spindle and thus the angular position of an adjustment of the seat height and / or seat tilt adjustment. These two parameters are in a clear relationship with the actual force acting on the vehicle seat weight, so that the evaluation unit 70 knowing the weight-dependent drag and the position of the spindle can clearly conclude on the force acting on the vehicle seat weight. The corresponding calculation can be made by means of an analytical formula expressing this dependence or by means of in the reference table 72 stored reference data values can be realized.

According to a further embodiment, the seat adjustment simultaneously allows a height and tilt adjustment using a multi-joint kinematics. With these kinematics, side panels of the upper frame and the seat pan are moved in a defined adjustment range by means of levers. The kinematic positions of the levers cause corresponding forces or torques around the respective pivot points under the action of weight. These forces counteracts a corresponding counterforce, so that the system vehicle seat is in balance. The forces are absorbed in particular as follows: On the loaded with a compressive force height adjustment spindle acts a counterforce; on the loaded with a compressive force tilt adjustment spindle acts a corresponding counterforce. The corresponding opposing forces have a clear dependence on the respective angular position of the associated adjusting lever. In such a kinematics can thus by means of two strain gauges 8th , like in the 10a represented, and a weight distribution or center of gravity shift detected on the seat and evaluated. For optimum detection accuracy, it should be noted that the maximum angle of the respective adjustment lever must be less than 90 °, since the actually acting normal force component always decreases with increasing angle of the adjusting lever. Ideally, such an adjustment kinematics is designed such that the angles of the adjusting levers are in angular ranges in which there is an approximately linear dependence of the counterforce acting on the adjusting spindle from the respective angle of the adjusting lever, for example in an angular range between approximately 20 ° and 50 °. This can be realized either by suitable limitation of the angular positions of the adjusting lever or by appropriate design of the kinematics, for example, using a power transmission. These remarks on the leverage ratios naturally also apply correspondingly to seat adjustment serving exclusively for seat height adjustment or seat tilt adjustment, as described above.

To further increase the measurement accuracy, the detection of at least one additional parameter according to another embodiment of the present invention may be advantageous. This will be exemplified below with reference to 8th . 9a . 9b and 10b to be discribed. According to the 8th is shown in a side view and in partial section, a seat height adjustment, in which the substantially L-shaped bracket with its base 13 with the seat upper rail 11 connected is. The one with the side leg 14 connected levers 15 the height adjustment protrudes laterally over the support of the upper rail 11 out. When loading the height adjustment thus results in a bending load, which leads to a load-dependent deformation of the bracket. This deformation is made by means of at the bottom of the base 13 attached further strain gauge 9 and to the evaluation unit 70 transmitted. On the basis of test series or analytical formulas, a different strain of the strain gauges depending on the load condition can be achieved 8th . 9 be recorded and evaluated situation-specific. As a result, not only can a higher measurement accuracy be achieved, but also further conclusions can be drawn about the type of load applied.

According to another embodiment, as in 9a is shown, such a further strain gauges 9 on the bottom of the connection of the seat upper rail 11 bearing brackets serving the vehicle seat 63 respectively. 64 attached, outside of the base area of the seat longitudinal adjustment, resulting in a leverage effect. According to another embodiment, as in 9b is shown, such a further strain gauges 9 on the top of the connection of the seat bottom rail 10 bearing blocks serving the floor of the passenger compartment 12 attached, and that outside the base of the seat-length adjustment, which also leads to a leverage effect.

According to the invention, the evaluation of deformations in the system vehicle seat can also be made in the event of a crash or other overload in order to gain further information about the actually acting on the vehicle seat loads. For this purpose, the signals can be recorded over a longer period of time and buffered with time resolution. Thus, by means of the arrangement and according to the 10b a direct statement is made as to whether there has been any plastic deformation on the components lying in the power flow of the vehicle seat. Because these can still be recognized after the end of the load. This makes it possible to make a statement, in particular after a slight crash, as to whether the vehicle seat has been damaged, even further use is impossible. Conventionally, such an evaluation is only with difficulty possible with minimal plastic deformation.

Again 10b can be removed, the signal of the evaluation 70 also to a black box 73 be transmitted in the vehicle, for further evaluation.

As the expert in studying the above description readily will be apparent, the signal evaluation of the invention even to to be used on the seat frame (and thus on the passenger) ascertained accelerations.

1

Spindle- or worm drive

2

drive motor

20

brace

21

bolts

3

gearbox

30

lower side leg

31

connecting leg

32

Through opening

33

connecting leg

34

upper side leg

35

adapter

36

adapter

4

spindle

40

Spindle taper

41

connecting bolts

42

adapter

5

seat

50

hinge section

51

hinge pins

52

firm connecting rod

53

pivoting lever

54

bolt

55

hinge pins

6

Seat frame side part

61

front adjusting

62

rear adjusting

63

front bearing block

64

rear bearing block

65

connecting bolts

66

axis

8th

Strain (DMS)

9

additional Strain gauges (DMS)

10

Seat rail

11

Seat upper rail

12

bearing block

13

Base of the bracket

14

side leg of the bracket

15

lever for height adjustment

70

headquarters evaluation

71

CPU processor

72

reference table

73

Black box

100

Seat bottom

101

seatback

Claims (20)

Arrangement for detecting a load which acts on a motor vehicle seat, which vehicle seat has two seat parts which are adjustable relative to one another ( 100 . 101 . 5 . 6 ) and an adjusting device for adjusting a seat adjustment, wherein the adjusting device, a transmission which is connected to the second of the two relatively adjustable seat parts, and a transmission housing ( 3 ) for receiving the transmission, characterized by a sensor ( 8th ) attached to the transmission housing ( 3 ) and is designed to prevent deformation of the transmission housing ( 3 ) in response to the load applied to the vehicle seat and to output an electrical signal in accordance with the detected load. Arrangement according to Claim 1, in which the sensor is used as strain gauges ( 8th ) is formed directly on the transmission housing ( 3 ) is attached, preferably by an adhesive connection. Arrangement according to Claim 2, in which the strain gauge ( 8th ) is assigned a further strain gauge, which are connected via a Wheatstone bridge circuit so that a strain gauge actively the deformation of the transmission housing ( 3 ) converts into a change in resistance and the other strain gauge is used to suppress disturbances, in particular temperature changes. Arrangement according to claim 3, wherein the Wheatstone bridge circuit Furthermore, a calibrated fixed resistor and a continuously adjustable potentiometer having. Arrangement according to one of the preceding claims, in which the sensor ( 8th ) on a side wall ( 31 . 33 ) of the transmission housing ( 3 ) is mounted, which absorbs static forces acting on the vehicle seat. Arrangement according to claim 5, wherein the transmission housing ( 3 ) consists of two plug-in bearing plates, which is connectable to each other and fastened to the second of the two relatively adjustable seat parts. Arrangement according to claim 6, wherein the bearing plates are U-shaped, with side legs ( 30 . 34 ) and these interconnecting connecting legs ( 31 . 33 ), whereby the sensor ( 8th ) on one of the connecting legs ( 31 ) is attached. Arrangement according to Claim 7, in which the connecting legs ( 31 . 33 ) Passage openings ( 32 ) for carrying out a spindle ( 4 ) or rack, wherein the sensor ( 8th ) immediately adjacent to one of the passage openings ( 32 ) is attached. Arrangement according to one of the preceding claims, at the adjusting the height adjustment of the vehicle seat is designed. Arrangement according to Claim 9, in which the adjusting device has a front adjusting lever ( 61 ) and a rear lever ( 62 ), which on a seat frame side part ( 6 ) are hinged, wherein a drive means, for example a spindle ( 4 ), to a location area ( 64 ) of an adjusting lever ( 62 ) and the transmission housing ( 3 ) to the seat frame side part ( 6 ) is articulated. Arrangement according to one of claims 1 to 8, wherein the adjusting device designed for seat pan tilt adjustment. Arrangement according to Claim 11, in which the adjusting device is provided with a seat frame side part ( 6 ) connected spindle receptacle ( 40 ) for receiving one end of a spindle ( 4 ), wherein the transmission housing ( 3 ) to one on the seat frame side part ( 6 ) pivotally mounted seat shell ( 5 ) is attached. Arrangement according to one of the preceding claims, further comprising a sensor for detecting a position of a drive means, for example a spindle ( 4 ) or rack, as well as an evaluation unit ( 70 ), which is designed to move from the detected position of the transmission housing ( 3 ) and from the detected deformation of the transmission housing ( 3 ) to calculate a force acting on the vehicle seat weight. Arrangement according to claim 9 or 10, in which the adjusting device is designed for seat height adjustment and a further adjusting device is provided for a seat inclination adjustment, to each of which a sensor ( 8th ) for detecting the respective deformation of the associated transmission housing ( 3 ), further comprising: an evaluation unit ( 70 ), which is designed to determine from the detected deformations a weight distribution or a center of gravity displacement on a seat bottom part ( 100 ) of the vehicle seat. Arrangement according to one of the preceding claims, further comprising: an additional identically formed sensor ( 9 ) for detecting a deformation at a portion of the vehicle seat other than the transmission case (FIG. 3 ), wherein the other region is selected such that the load acting on the vehicle seat leads to a deformation at the other region, wherein an evaluation unit ( 70 ), which is designed to be the electrical signals of the two sensors ( 8th . 9 ) and to calculate a weight force and / or weight distribution acting on the vehicle seat. Arrangement according to Claim 15, in which the additional sensor ( 9 ) on a bracket ( 13 . 14 ) a Sitzhöhenverstellhebels ( 15 ) is mounted, in an area where the bracket laterally over a seat upper rail ( 11 ) protrudes a Sitzlängsverstelleinrichtung to which the vehicle seat is connected. Arrangement according to Claim 15, in which the additional sensor ( 9 ) on a bearing block ( 12 . 63 . 64 ) is attached for attachment to a Sitzlängsverstelleinrichtung, which is a seat bottom rail ( 10 ) and a relative to this adjustable seat upper rail ( 11 ) and connected to the vehicle seat and the floor of a passenger compartment. Arrangement according to one of claims 13 to 17, further comprising a memory ( 72 ) for storing a reference table, wherein the evaluation unit ( 70 ) with the memory ( 72 ) and configured to perform the calculation using reference data stored in the reference table. Arrangement for evaluating a load acting on a motor vehicle seat, furthermore comprising at least one arrangement according to one of the preceding claims, having an evaluation unit ( 70 ), which is designed to detect the electrical signals of the sensor ( 8th ) or the sensors ( 8th . 9 ) and to indicate an overload, a crash or a plastic deformation of components of the vehicle seat. Arrangement according to claim 19, further comprising a black box ( 73 ) connected to the evaluation unit ( 70 ) and is designed to provide evaluation results of the evaluation unit ( 70 ) record.