DE102015216054A1 - Adjustment device for a vehicle seat - Google Patents

Abstract

The present invention relates to an adjusting device (V) for adjusting a first seat part (R, S, U, K) of a vehicle seat (F) relative to a second seat part (S, R) of the vehicle seat (F) along a displacement, wherein one of Seat parts (R, S, U, K) is associated with a first, about a first axis of rotation (A) rotatable, toothed element (1) of the adjusting device (V), and the other seat part (R, S, U, K), a second toothed element (2) is associated with the adjusting device (V) which meshes with the first toothed element (1) in order to rotate the first toothed element (1), the first seat part (R, S, U, K) relative to the second seat part (S, R) to adjust. According to the invention, the first and second toothed elements (2, 1) each have toothings (20, 10) with a non-constant pitch circle and / or pitch circle diameter changing along the respective toothing (20, 10), so that over the adjustment path ( s) of the first seat part (R, S, U, K) varies a gear ratio of the meshing first and second toothed elements (2, 1).

Description

The present invention relates to an adjusting device for a vehicle seat according to the preamble of claim 1.

A generic adjustment is, for example, in the WO 2012/084158 A1 for adjusting a seat height of a vehicle seat described. About the adjusting a first seat part is here adjusted in the form of a seat base relative to a second seat part in the form of a guide rail assembly with attachments for the seat base. For this purpose, the adjusting device has a first, rotatable about a first axis of rotation, toothed (ie, provided with a toothing) element in the form of a motor-driven drive pinion and a second toothed element in the form of a toothed segment, which meshes with the drive pinion. While the drive pinion is assigned to the height adjustable seat base, the gear segment of the guide rail assembly is assigned and fixed immovably on one of the rails. About the intermeshing toothed elements and the intermeshing teeth of the two toothed elements a constant translation is realized to implement a rotational movement of the drive pinion in an adjustment of the seat frame relative to the guide rail assembly.

In principle, however, a gear segment can be immovably fixed to an actuating lever, which is rotatably mounted rotatably on a rail of the guide rail assembly. Alternatively, a gear segment can be immovably fixed to one of the rails and the drive pinion can be fixed to the rotatable actuating lever.

Adjustment devices with comparable gear drives are also used for manual seat height adjustments. Both in power-operated and manual adjustment can be provided that not only one of the toothed elements, but both toothed elements are rotatable to control an adjustment of a first seat part relative to a second seat part.

In particular, in seat height adjustments in the vehicle area, the applied for adjustment drive torque varies relatively strongly depending on the current seat height. For example, a much smaller drive torque is required for lifting in the uppermost end position than when lifting the seat frame from the lowest end position. In order to support the adjustment just in a lower adjustment, accordingly, additional spring elements are provided. However, the previously known solutions involve some disadvantages. For example, the different mechanical solutions are sometimes extremely complex.

In power-operated adjusting a drive motor is again designed to be large in order to apply the highest required drive torque problems. In power-operated adjustment then further measures must be taken on the control electronics regularly to realize a comparatively constant adjustment over the entire adjustment of the first seat part.

It is an object of the invention to provide an improved adjustment in this regard for the adjustment of a seat part of a vehicle seat.

This object is achieved with an adjustment of claim 1.

An adjusting device according to the invention has two intermeshing toothed elements, of which at least one is rotatably mounted and cause an adjustment of the first seat part relative to a second seat part of the vehicle seat upon rotation of the at least one rotatable toothed element. It is further provided according to the invention that the two first and second toothed elements each have a toothing with a pitch circle and / or pitch circle diameter changing along the respective toothing, so that a transmission ratio of the meshing first and second toothed elements varies over the adjustment path of the first seat part ,

The invention is thus based on the basic idea that a transmission with a variable transmission ratio is already provided via the teeth of only two intermeshing toothed elements of the adjusting device, wherein a translation dependent on the adjustment is provided by at both gears changing pitch circle and / or pitch circle diameter , As a function of an adjustment position of the first seat part along its adjustment path, a changing transmission ratio is thus realized by pairing the first and second toothed elements, for example by having a different pitch circle and / or pitch circle diameter in a first area of the toothing of the first toothed element as in an adjoining area of this gearing. Depending on the type of toothing, it is of course also possible for the pitch circle (section) and the pitch circle (section) to coincide in the respective area. However, as is known, this is not mandatory. Thus, according to the invention, a variable Transmission ratio along the adjustment of the first seat part over changing and preferably non-circular, ie, each not along a circular path with a constant radius extending teeth provided. This is understood in particular the possibility of variable engagement angle of a toothing of a toothed element from the first to the last tooth of the toothing and optionally with unequal pressure angle at the other, hereby meshing toothed element to pair.

By inventively provided variable design of the transmission ratio along the adjustment of the respective seat part can be achieved particularly easy equalization of applied for the adjustment drive torque and a homogenization of the adjustment of the seat part. With a homogenization of the required drive torque, an improved acoustics is achieved with a power-operated adjusting device. Thus, an engine load can be kept constant, whereby disturbing engine noise can be reduced to a minimum. A variably variable depending on the displacement translation can also be used to change the adjustment speed at a constant driving speed of the driving toothed element.

To improve the sliding conditions during tooth engagement, a profile displacement can be provided on the intermeshing toothed elements. To improve the strength and thus the crash behavior, a toothing can in each case in principle be designed so that slipping and supporting over the head or Fußkreisdurchmesser a tooth or a series of teeth and thus not only a torque transmission over the respective tooth flanks is guaranteed.

In one embodiment, it can be provided that the different transmission ratios are provided by graduated pitch circle and / or pitch circle diameter of the meshing first and second toothed elements. Here, therefore, change the respective diameter and thus the gear ratios in predefined stages and thus discretely when passing through certain adjustment positions along the displacement of the first seat part.

The toothings of the first and second toothed elements, via which the toothed elements mesh with one another, can in principle be designed such that the transmission ratio changes discretely or continuously several times along the displacement path of the first seat part. In particular, it can be provided that the transmission ratio consistently increases over the adjustment path between two possible end positions of the first seat part, falls consistently or falls in at least one portion of the adjustment path, while it rises in another portion of the adjustment. In the latter case, the gear ratio on the adjustment on a turning point, so that, for example, the ratio between driving first toothed element and second toothed element initially discretely or continuously increases during an adjustment of the first seat part from a first end position towards a second end position and then from Achieving a certain adjustment again consistently discretely or continuously drops until the first seat part reaches its second end position.

In one embodiment, the second toothed element is also rotatably mounted about a second axis of rotation to implement a rotation of the first toothed element about its first axis of rotation in an adjustment of the first seat part of the vehicle seat. In such a variant, the distance between the first axis of rotation of the first toothed element and the second axis of rotation of the second toothed element is invariable. The changing Teilkreis- and / or Wälzkreisdurchmesser are thus coordinated with each other here so that a distance of the axes of rotation remains constant despite the varying transmission ratio on the adjustment of the first seat part.

In one embodiment, the toothing of the two intermeshing toothed elements with the changing pitch circle and / or Wälzkreisdurchmessern lie in a common plane. The non-circular teeth of the two toothed elements thus extend in a plane along a circumferential line about the respective axis of rotation.

In an alternative embodiment, portions of the teeth of the first and second toothed elements, which are assigned to different transmission ratios, extend in different planes, which are axially offset from each other. At least one of the teeth of the first or second toothed element thus extends, for example, along a uniformly or non-uniformly rising helix on a lateral surface of this toothed element. This includes in particular a (in plan view along a rotation axis) spiral or helical course of the teeth.

In one embodiment, the first toothed element is formed by a gear element in the form of a drive pinion. Alternatively or In addition, the second toothed element may be formed by a rotatable or immovably fixed gear segment. In a rotatably mounted gear segment, this can also be mounted eccentrically.

In principle, the solution according to the invention is independent of the type of toothing. For example, a helical toothing, an involute toothing or a cycloidal toothing can be provided. In individual areas of the respective toothings of the toothed elements, different toothing types can also be provided for the different gear ratios and thus combined on one of the toothed elements. In other words, one of the toothed elements has, for example, a first toothed region with involute toothing and a second toothed region with cycloid toothing connected thereto. For example, a first toothed element designed as a drive pinion is provided with a helical toothing, an involute toothing and / or a cycloidal toothing. Additionally or alternatively, this drive pinion can be configured conical.

In one embodiment, a second toothed element designed as a gear segment extends at a non-right angle inclined to the first axis of rotation of the other first toothed element meshing therewith. If the gear segment itself is rotatably mounted and the axes of rotation of the two toothed elements run parallel to one another, the gear segment in this embodiment consequently also extends at a non-right angle inclined to its (the second) axis of rotation.

In a further development, the gear segment, which extends inclinedly relative to the axis of rotation, meshes with a drive pinion which has a helically running toothing. By such a combination, the drive pinion is rotatable by more than 360 °, without having to do without over the complete adjustment of the first seat part variable pitch and / or Wälzkreisdurchmesser. In principle, it is preferred if at least one of the toothed elements is rotatable by more than 180 °, in particular by more than 270 °, in order to adjust the first seat part between two possible end positions.

In one embodiment, at least one stop is provided, over which a rotational path of a toothed element is limited about its axis of rotation. Such a stop is formed, for example, on a fixed component of the adjusting device in the form of a projecting extension. At the stop the respective toothed element strikes with a counter-stop in order to give the first seat part an end position. Two stops then both possible end positions of the first seat part can be specified.

The adjusting device according to the invention can be set up and provided in particular for a seat height adjustment, for a tilt adjustment of a seat pan, for an inclination adjustment of a backrest, for an adjustment of a lower leg support or for an adjustment of a backrest head of a backrest to a vehicle seat.

For (further) reduction of the required driving forces and moments and / or the reduction of noise due to an undesirable play between two adjustable components of the adjusting device, at least one spring element is additionally provided in a variant embodiment. About the at least one spring element is preferably a component of the adjusting device is resiliently biased by means of which an adjusting movement generated via the toothed elements can be transmitted.

To facilitate the installation of the adjusting device is provided in one embodiment, that are provided on at least one of the toothed elements mounting marks that indicate a proper orientation of the toothed elements to each other. Due to the different pitch circle and / or pitch circle diameter can be ensured by the use of mounting marks in a relatively simple manner during assembly that the two respective toothed elements are intended paired with each other and mesh with the desired gear ratio with each other. Such mounting marks are formed, for example, by simple visual markings on the toothed elements. Alternatively or additionally, the mounting marks may be contacting one another, which ensure by their contact with each other or their latching together a proper alignment of the two toothed elements to each other during assembly.

Further features and advantages of the invention will become apparent in the following description of exemplary embodiments with reference to the figures.

Hereby show:

1A to 1B a detail of a first embodiment of an adjusting device according to the invention for a seat height adjustment;

2A to 2 B a detail of a second embodiment of an adjusting device according to the invention for a seat height adjustment;

3A to 3B Diagrams for illustrating a torque curve and a Verstellgeschwindigkeitverlaufs for a known from the prior art adjusting device for seat height adjustment;

4A to 4B Diagrams for illustrating the torque curve and the Verstellgeschwindigkeitverlaufs for an adjusting device according to the invention;

5 schematically a further embodiment of an adjusting device according to the invention for the inclination adjustment of a backrest;

6 schematically a further embodiment of an adjusting device according to the invention for the adjustment of a lower leg rest of a vehicle seat;

7 schematically a further embodiment of an adjusting device according to the invention for the adjustment of a seat pan of a vehicle rear seat;

8th schematically a further embodiment of an adjusting device according to the invention for the adjustment of a backrest of a vehicle rear seat;

9 schematically a further embodiment of an adjusting device according to the invention for adjusting a backrest head of a backrest;

10 in side view a vehicle seat with an illustration of a possible position for an adjusting device according to the invention.

The 10 shows schematically and in side view a vehicle seat F with a seat side part and a seat pan S (for reasons of simplicity, the reference numeral "S" used for both components), on which or a backrest R of the vehicle seat F is arranged and optionally pivotally mounted relative thereto , A seat base and the seat side part S comprehensive seat base is adjustable in height relative to a rail assembly SA. For this purpose, the seat base is connected via a plurality of wings W1 and W2 with the rail assembly SA. For this purpose, the rockers W1 and W2 are each articulated to hinge points G1 and G3 on the rail arrangement SA and to hinge points G2 and G4 on the seat base frame. About an adjusting device V, not shown here, the seat height is manually or externally operated adjustable to raise or lower the seat base along an adjustment H.

The adjusting device V usually comprises a gear stage with at least two intermeshing toothed elements. One of the toothed elements can in this case, for example, by means of a drive motor power-operated or manually offset by an actuating lever in rotation. This (first) driven toothed element, e.g. in the form of a gear member, meshing with a likewise rotatable or fixed (second) toothed member to implement the rotation of the driven toothed member in an adjustment movement of the seat frame relative to the bottomed rail assembly SA.

In the 1A and 1B is a first embodiment of an inventively designed adjusting V shown and set up for seat height adjustment on a vehicle seat F and set up. In this adjustment V is a driven first toothed element by a drive pinion 2 educated. This is present seat part fixed and accordingly on a seat side part of the adjustable in height seat base frame via a bearing plate 4 fixed to the seat side part. Here is the drive pinion 2 For example, manually via an operating lever 3 or power-operated by a preferably electric motor drive to a rotation drivable. A corresponding transmission mechanism known per se can be used, for example, on a housing section of the actuating lever 3 be arranged.

The drive pinion 2 meshes with a second toothed element of a gear stage in the form of a gear segment 1 to transmit an adjustment to the seat base. The gear segment 1 For this purpose, for example, rotatably connected to a cross tube of the seat base, which is rotatably mounted on the seat base. Is over the drive pinion 2 a drive torque to the gear segment 1 transferred, the cross tube is set in rotation about a rotation axis A. This leads in a manner known per se, for example via at least one pivoting lever or a pair of rockers to an adjusting force on the seat underframe in order to raise or lower it along the adjustment direction H.

In order to adjust the adjustment of the seat base relative to the bottom-fixed rail assembly SA equalization of applied for the adjustment drive torque and a homogenization of the adjustment over the entire permissible adjustment range reach, are in this case the drive pinion 2 and the gear segment 1 with gears 20 and 10 provided, the changing pitch circle and / or Wälzkreisdurchmesser along the respective teeth 20 or 10 exhibit. Here the gears change 10 and 20 about which the two toothed elements 1 and 2 mesh with each other, such that on the adjustment of the seat base from a lowermost end position to an uppermost end position, a gear ratio between the two toothed elements 1 and 2 continuously changes. A distance of the axis of rotation A of the gear segment 1 to a rotation or pinion axis B of the drive pinion 2 always stays constant. Due to the variable pitch and / or pitch circle diameter of gear segment 1 to the drive pinion 2 However, the gear ratio changes over the adjustment of the seat base and thus over the hub. So form the drive pinion 2 and the gear segment 1 in each case at least two toothing areas 200 . 201 and 100 . 101 at their respective teeth 20 or 10 from that define each other different pitch circle and / or Wälzkreisdurchmesser. Both gears 20 and 10 are thus out of bounds.

While the two gearing areas 100 and 200 are associated with a lower end position of the seat base and define the largest transmission ratio, are the toothed areas 101 and 201 associated with an upper end position of the seat base and define a much smaller gear ratio. In the present case, the transmission ratio varies over the adjustment path from over 10 (below) to below 8 (above), eg from about 11 to about 7.5. In a lower part of the adjustment with higher driving forces is thus on the two toothed elements 2 . 1 a lighter ratio between pinion gear 2 and gear segment 1 defined, while in a higher range with lower driving forces a heavy gear ratio is defined.

The over the adjustment from the lowest end position to the topmost end position falling gear ratio is achieved in that the pitch circle and / or pitch circle diameter of the drive pinion 2 over the circumference of the drive pinion 2 increases in a circumferential direction (here in a clockwise direction) and consequently the teeth of the toothing 20 get larger and the coordinated thereto pitch circle and / or pitch circle diameter of the gear segment 1 becomes smaller over its circumference in an opposite circumferential direction (counterclockwise) and thus the size of the teeth of the toothing 10 reduced.

About the variable transmission ratio as a function of the current adjustment position of the seat base is achieved in a simple manner that that on the drive pinion 2 applied torque can be kept relatively constant over the entire adjustment, while the adjustment of the counteracting torque varies and decreases in the direction of the uppermost end position.

In the embodiment of the 2A and 2 B is the gear segment 1 together with a section of a cross tube or a transverse shaft 5 shown with the gear segment 1 rotationally fixed, for example by welding, is connected. In the variant of 2A and 2 B the serrations go 10 and 20 of the gear segment 1 and the drive pinion 2 unlike the variant of 1A and 1B not substantially in one and the same plane, regardless of the current gear ratio, but the gear ratios associated with the different gear ratios 100 . 101 and 200 . 201 the two toothed elements 1 and 2 are each arranged in axially spaced-apart planes. This is how the teeth go 20 of the drive pinion 2 here along a rising helix and thus spirally on the outer surface of the drive pinion 2 along the axis of rotation B. The gearing 20 of the drive pinion 2 thus appears in a plan view along the axis of rotation B helical or spiral.

This is at constant center distance to the axis of rotation B of the drive pinion 2 rotatably mounted gear segment 1 again has a gearing 10 on, obliquely to the axis of rotation A of the gear segment 1 runs. The inclination of the gear segment 2 with respect to its axis of rotation A is in particular on the basis of 2 B seen. It can be seen that the gear segment 2 extends at an angle α not equal to 90 ° with respect to its axis of rotation A. By combining the worm shape of the drive pinion (or screw worm) 2 with its spiraling or helical toothing 20 and the hereby meshing, oblique gear segment 1 is achieved at a constant center distance of the two axes of rotation A and B, a variable ratio over the stroke and also a rotation of the drive pinion 2 more than 360 ° allows you to adjust the seat base from the lowest end position to the highest end position.

The 3A and 3B show diagrams in which the course of a drive torque M and an adjustment speed v over the displacement s of a height-adjusted seat base according to the prior art are illustrated. Here is from the 3A In particular, it can be seen how the applied drive torque drops significantly over the adjustment path s and also the Adjustment speed v varies over the adjustment path small s comparatively strong.

With an inventively designed adjusting V according to the variants of 1A to 1B and 2A to 2 B can be applied to offset drive torque M significantly. The same applies to the adjustment speed v. This is based on the diagrams of 4A and 4B clarified. In this case, it is important to note the opposite of the representations of the 3A and 3B different scale of the ordinate.

An adjusting device V according to the invention is effectively used not only in a seat height adjustment, but also for the adjustment of other seat parts of a vehicle seat F, especially in such adjustment V, where a drive torque for the seat part to be adjusted varies significantly over the adjustment and / or in which the driving Zahnratelement to be rotated more than 270 ° or more than 360 °. Again, on the solution according to the invention with a gear stage by changing the pitch circle and / or Wälzkreisdurchmesser a variable over the adjustment gear ratio provides to hold the applied torque relatively constant and thus to keep the load of a drive motor constant at power-operated adjusting devices. A constant load also achieves constant engine noise and thus improved acoustics. Incidentally, the solution according to the invention is also advantageous in adjusting devices in which particularly high force or a comparatively high speed is required in only certain adjustment ranges.

The 5 to 9 show, by way of example, further embodiments of an adjusting device V according to the invention on a vehicle seat, wherein the respective adjusting device V here in each case has a motor 6 for the power-operated adjustment of the respective seat part provides.

In the 5 is schematically an adjusting device V with a gear segment 1 and a backrest-proof drive pinion 2 shown for the inclination adjustment of a backrest R relative to a seat frame. By rolling on the gear segment 1 causes the rotatably mounted on the backrest R drive pinion 2 an adjustment of the backrest R.

The 6 shows a variant of an adjustment V for the adjustment of a lower leg rest U of a vehicle seat F relative to a seat side part and / or a seat S of the vehicle seat F. However, this is not mandatory, it is proposed here that drive pinion 2 to provide with the driving motor on the seat side part and the gear segment meshing therewith 1 on the lower leg support U.

Another possibility for using an adjusting device V according to the invention is in the 7 illustrated. In this case, adjustment of a seat pan S by means of the adjusting device V is possible under the influence of a force-actuation, in order to raise or lower it. A lowering of the seat pan S is desired, for example, in vehicle rear seats to provide additional cargo space or to facilitate entry into the vehicle fund.

With the 8th An adjusting device V for adjusting a slope of a trained as a so-called towing backrest R of a vehicle seat F is illustrated.

In the variant of 9 is the adjustment V used to adjust a backrest head K a backrest R in its inclination.

Allen aforementioned embodiments is common that on the present invention designed gear stage with two toothed elements 1 and 2 , Which each have changing and matched to one another Teilkreis- and / or Wälzkreisdurchmesser, depending on the adjustment position of the respective seat part to be adjusted ratio can be provided. As a result of this over the displacement s varying transmission ratio, for example, by a motor 6 generated drive torque can be kept relatively constant, however, the adjustment of the counteracting torque varies over the adjustment s.

In each of the adjustment devices V shown may be provided stops to a rotational path of the driving drive pinion 2 or the driven gear segment 1 to limit and hereby an end position of the respective seat part (seat frame according to 1A - 2 B , Backrest R according to the 5 and 8th , Lower leg support U according to the 6 , S seat S according to the 7 or backrest head K according to the 9 ) define.

To reduce the applied driving force and / or for biasing the respective kinematic system for the prevention of unwanted rattling noises at least one spring element may be part of the adjustment V. Such a spring element then engages on a component of the adjusting device V, for example one of the toothed elements 1 or 2 or a component cooperating therewith to bias it in one direction.

LIST OF REFERENCE NUMBERS

1

Gear segment (2nd toothed element)

10

gearing

100, 101

toothed area

2

Drive pinion (1st toothed element)

20

gearing

200, 201

toothed area

3

actuating lever

4

bearing plate

5

Cross tube / cross shaft

6

engine

A

axis of rotation

B

Rotary / pinion axis

F

vehicle seat

G1-G4

fulcrum

H

direction

K

sit head

M

moment

R

backrest

S

Seat pan / seat side part

s

adjustment

SA

rail arrangement

U

Lower leg

V

adjustment

v

adjustment

W1, W2

wing

α

angle

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2012/084158 A1 [0002]

Claims (13)

Adjusting device for adjusting a first seat part (R, S, U, K) of a vehicle seat (F) relative to a second seat part (S, R) of the vehicle seat (F) along a displacement path, wherein one of the seat parts (R, S, U, K) a first, about a first axis of rotation (B) rotatable, toothed element ( 2 ) of the adjusting device (V) is assigned, and the other seat part (R, S, U, K), a second toothed element ( 1 ) associated with the adjusting device (V), which is connected to the first toothed element ( 2 ) meshes during rotation of the first toothed element ( 2 ) the first seat part (R, S, U, K) relative to the second seat part (S, R) to adjust, characterized in that the first and second toothed elements ( 2 . 1 ) each toothing ( 20 . 10 ) with one extending along the respective gearing ( 20 . 10 ), so that via the adjustment path (s) of the first seat part (R, S, U, K) a ratio of the meshing first and second toothed elements ( 2 . 1 ) varies. Adjusting device according to claim 1, characterized in that the toothings ( 20 . 10 ) of the first and second toothed elements ( 2 . 1 ) about which the toothed elements ( 2 . 1 ) mesh with each other, are formed such that the transmission ratio changes several times along the displacement (s). Adjusting device according to claim 1 or 2, characterized in that the toothings ( 20 . 10 ) of the first and second toothed elements ( 2 . 1 ) about which the toothed elements ( 2 . 1 ) are formed such that the transmission ratio across the adjustment (s) of the first seat part (R, S, U, K) consistently increases between two possible end positions of the first seat part (R, S, U, K) consistently falls or in at least a portion of the displacement (s) falls while it rises in another portion of the Verstellwegs (s). Adjusting device according to one of claims 1 to 3, characterized in that the second toothed element ( 1 ) is rotatably mounted about a second axis of rotation (A) and a distance between the first axis of rotation (B) of the first toothed element ( 2 ) and the second axis of rotation (A) is immutable. Adjusting device according to one of the preceding claims, characterized in that regions ( 200 . 100 ; 201 . 101 ) of the gears ( 20 . 10 ) of the first and second toothed elements ( 2 . 1 ), which are assigned to different gear ratios, run in different planes, which are axially offset from each other. Adjusting device according to one of the preceding claims, characterized in that the first toothed element by a drive pinion ( 2 ) is formed and / or the second toothed element by a gear segment ( 1 ) is formed. Adjusting device according to claim 6, characterized in that the gear segment ( 1 ) is mounted eccentrically. Adjusting device according to claims 5 and one of claims 6 or 7, characterized in that the drive pinion ( 2 ) a spiral around the first axis of rotation (B) extending toothing ( 20 ) having. Adjusting device according to claims 5 and one of claims 6 to 8, characterized in that the drive pinion ( 2 ) has a helical toothing, an involute and / or a cycloidal toothing and / or is cone-shaped. Adjusting device according to claims 5 and 6 or claim 8 or 9, characterized in that the gear segment ( 1 ) at a non-right angle (α) inclined to the first axis of rotation (B). Adjusting device according to one of the preceding claims, characterized in that at least one of the toothed elements ( 2 . 1 ) is rotatable by more than 180 °, in particular by more than 270 °, in order to adjust the first seat part (R, S, U, K) between two possible end positions. Adjusting device according to one of the preceding claims, characterized in that at least one stop is provided, via which a rotary path of a toothed element ( 2 . 1 ) is limited about its axis of rotation (B, A). Adjusting device according to one of the preceding claims, characterized in that the adjusting device (V) for a seat height adjustment, for a tilt adjustment of a seat pan (S), for a tilt adjustment of a backrest (R), for an adjustment of a lower leg support (U) or for an adjustment a backrest head (K) of a backrest (R) is set up and provided.

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