DE102022110005A1 - Adjustment device and vehicle seat - Google Patents

Abstract

The invention relates to an adjusting device (100) for a headrest (3), with a headrest connection (3a), with a first articulated arm (A) via a first joint (Ga) and a second articulated arm (B) via a second joint (Gb) are articulated to the headrest connection (3a), - a backrest connection (5), with the first articulated arm (A) via a third joint (Ga) and the second articulated arm (B) via a fourth joint (Gd ) are articulated to the backrest connection (5), so that a four-bar linkage (6) is formed, and - a drive unit (4) which is designed to act on the two articulated arms (A, B) in such a way that the headrest connection (3a) is adjusted relative to the backrest connection (5) when the drive unit (4) is actuated. According to the invention, a gear unit (7) is arranged on the backrest connection (5), wherein - a first drive (4a) of the drive unit (4) acts via the gear unit (7) on both the first articulated arm (A) and the second articulated arm (B) and, independently of this, - a second drive (4b ) the drive unit (4) acts via the gear unit (7) on both the first articulated arm (A) and the second articulated arm (B), the two drives (4a, 4b) being able to be controlled independently of one another to adjust the headrest connection (3a) guided by the four-bar linkage (6) relative to the backrest connection (5) via the gear unit (7).

Description

The invention relates to an adjusting device according to the preamble of claim 1 and a vehicle seat with such an adjusting device.

Headrests of vehicle seats are usually attached to the backrest via an adjustment device (manually or automatically). The coupling between the backrest and the vehicle seat can take place, for example, via a joint mechanism of the adjusting device, which also ensures appropriate guidance of the headrest. The joint mechanism can be in the form of a four-bar linkage, for example a parallelogram guide with articulated arms of equal length, as in an embodiment in EP 3 372 445 A1 described, but also in a parallelogram-like design with articulated arms of different lengths, as supplementary in EP 0 303 145 A1 described, carried out.

DE 10 2015 109 656 A1 further describes that a support unit designed as a joint mechanism is operatively connected to a pawl arm, which in turn is acted upon by a drive shaft of a drive arranged in the backrest. By activating the drive, the drive shaft is moved up or down, whereby the pawl arm activates the joint mechanism and the headrest is adjusted.

In DE 10 2016 119 383 A1 A joint mechanism consisting of two parallel joint arms or connections in the manner of a parallelogram guide is also described, which can be actuated via an output shaft or threaded rod operatively connected to a drive in order to adjust the headrest. The drive is arranged in a housing above the backrest and outside the headrest.

The invention is based on the object of creating an adjustment device and a vehicle seat in which a flexible adjustment of the headrest is made possible with a compact and robust design.

This task is solved by an adjustment device and a vehicle seat according to the independent claims. The subclaims describe preferred further developments.

• - eine Kopfstützen-Anbindung zur Anbringung an der Kopfstütze, wobei ein erster Gelenkarm über ein erstes Gelenk und ein zweiter Gelenkarm über ein zweites Gelenk an der Kopfstützen-Anbindung angelenkt sind,
• - eine Rückenlehnen-Anbindung zur Anbringung an einer Rückenlehne des Fahrzeugsitzes, wobei der erste Gelenkarm über ein drittes Gelenk und der zweite Gelenkarm über ein viertes Gelenk an der Rückenlehnen-Anbindung angelenkt ist, so dass sich ein Gelenkviereck ausbildet, vorzugsweise eine Parallelogrammführung zum Beibehalten der Winkellage der Kopfstütze, wenn beide Gelenkarme parallel zueinander verlaufen, wobei beide Gelenkarme vorzugsweise auch dieselbe Länge aufweisen, und
• - eine elektrisch ansteuerbare Antriebs-Einheit, die nicht an der Kopfstütze angeordnet ist, vorzugsweise fest mit der Rückenlehnen-Anbindung verbunden ist, und die ausgebildet ist, derartig auf die beiden Gelenkarme einzuwirken, dass sich die Kopfstützen-Anbindung bei einer Betätigung der Antriebs-Einheit gegenüber der Rückenlehnen-Anbindung verstellt.

The adjusting device for a headrest of a vehicle seat therefore has at least:

• - a headrest connection for attachment to the headrest, wherein a first articulated arm is connected to the headrest connection via a first joint and a second articulated arm is connected to the headrest connection via a second joint,
• - a backrest connection for attachment to a backrest of the vehicle seat, the first articulated arm being articulated via a third joint and the second articulated arm via a fourth joint on the backrest connection, so that a four-bar linkage is formed, preferably a parallelogram guide for maintaining the Angular position of the headrest when both articulated arms run parallel to one another, with both articulated arms preferably also having the same length, and
• - an electrically controllable drive unit, which is not arranged on the headrest, is preferably firmly connected to the backrest connection, and which is designed to act on the two articulated arms in such a way that the headrest connection opens when the drive unit is actuated. Unit adjusted relative to the backrest connection.

• - ein erster Antrieb der Antriebs-Einheit über die Getriebe-Einheit (gleichzeitig bzw. simultan) sowohl auf den ersten Gelenkarm als auch auf den zweiten Gelenkarm einwirkt, und unabhängig davon
• - ein zweiter Antrieb der Antriebs-Einheit über die Getriebe-Einheit ebenfalls (gleichzeitig bzw. simultan) sowohl auf den ersten Gelenkarm als auch auf den zweiten Gelenkarm einwirkt,

wobei die beiden Antriebe unabhängig voneinander elektrisch ansteuerbar sind, um über die Getriebe-Einheit die Kopfstützen-Anbindung geführt von dem Gelenkviereck gegenüber der Rückenlehnen-Anbindung in eine x-Richtung bzw. longitudinal und/oder eine z-Richtung bzw. vertikal zu verstellen.According to the invention, for an automatically adjustable headrest, it is provided that in this adjustment device a gear unit is arranged on the backrest connection, which is preferably constructed like a type of differential gear, whereby

• - a first drive of the drive unit acts via the gear unit (simultaneously or simultaneously) on both the first articulated arm and the second articulated arm, and independently thereof
• - a second drive of the drive unit also acts (at the same time or simultaneously) on both the first articulated arm and the second articulated arm via the gear unit,

wherein the two drives can be electrically controlled independently of one another in order to adjust the headrest connection, guided by the four-bar linkage, relative to the backrest connection in an x-direction or longitudinally and/or a z-direction or vertically via the gear unit.

According to the invention, a vehicle seat is also provided with such an adjustment device, the backrest connection being connected to the backrest and the headrest connection being connected to the headrest.

Accordingly, both the drive unit and the gear unit can be arranged in a backrest connection mounted away from the headrest, so that no space is required in the headrest for the main function of adjustment and the sensitive components of the adjustment mechanism nik cannot be implemented in the headrest. The gear unit can be planned and protected in the backrest with little construction effort, so that the two drives are each independent of one another via the third joint and the fourth joint of the four-bar linkage, which lie within the gear unit and thus the backrest connection , act on the two articulated arms. Both vertical and longitudinal adjustment of the headrest can then be carried out in an automated manner via the drive unit, in that the two drives act on the transmission unit independently of one another in a corresponding manner. For this purpose, it is preferably provided that the first drive and the second drive are each designed to adjust the two articulated arms synchronously and/or simultaneously.

• - ein vorderes Kegelzahnrad, das innerhalb der Getriebe-Einheit um eine erste Träger-Drehachse schwenkbar mit der Gehäuse-Anbindung verbunden ist, wobei das dritte Gelenk auf der ersten Träger-Drehachse liegt, und
• - ein hinteres Kegelzahnrad, das innerhalb der Getriebe-Einheit um eine zweite Träger-Drehachse schwenkbar mit der Gehäuse-Anbindung verbunden ist, wobei das vierte Gelenk auf der zweiten Träger-Drehachse liegt, wobei eine vordere Gewindestange in ein vorderes Innengewinde des vorderen Kegelzahnrades entlang einer dritten Träger-Drehachse eingeschraubt ist und eine hintere Gewindestange in ein hinteres Innengewinde des hinteren Kegelzahnrades entlang einer vierten Träger-Drehachse eingeschraubt ist, wobei die vordere Gewindestange als Bestandteil des ersten Gelenkarms und die hintere Gewindestange als Bestandteil des zweiten Gelenkarms jeweils zu der Kopfstützen-Anbindung führen. Damit können mit den Kegelzahnrädern und den Gewindestangen zwei Gelenkarme ausgebildet werden, auf die über beide Antriebe eine Verstellung erreicht werden kann, wobei durch ein Verdrehen der Gewindestangen in den Innengewinden auch eine Höhenverstellung erreicht werden kann.

Preferably it is further provided that the transmission unit has:

• - a front bevel gear, which is pivotally connected to the housing connection within the gear unit about a first carrier axis of rotation, the third joint lying on the first carrier axis of rotation, and
• - a rear bevel gear, which is pivotally connected to the housing connection within the gear unit about a second carrier axis of rotation, the fourth joint lying on the second carrier axis of rotation, with a front threaded rod in a front internal thread of the front bevel gear along a third carrier axis of rotation is screwed and a rear threaded rod is screwed into a rear internal thread of the rear bevel gear along a fourth carrier axis of rotation, the front threaded rod as part of the first articulated arm and the rear threaded rod as part of the second articulated arm each being connected to the headrest. Lead connection. This means that two articulated arms can be formed with the bevel gears and the threaded rods, to which adjustment can be achieved via both drives, and height adjustment can also be achieved by turning the threaded rods in the internal threads.

• - das vordere Kegelzahnrad zusammen mit der eingeschraubten vorderen Gewindestange über das dritte Gelenk um die erste Träger-Drehachse und das hintere Kegelzahnrad zusammen mit der eingeschraubten hinteren Gewindestange über das vierte Gelenk um die zweite Träger-Drehachse verschwenken zum geführten Verstellen beider Gelenkarme, und/oder
• - sich die Kegelzahnräder derartig um ihre eigene Achse verdrehen, dass die in das jeweilige Innengewinde eingeschraubten Gewindestangen axial entlang der dritten Träger-Drehachse und der vierten Träger-Drehachse verstellt werden und sich dadurch ein Abstand zwischen dem ersten Gelenk und dem dritten Gelenk des ersten Gelenkarms und zwischen dem zweiten Gelenk und dem vierten Gelenk des zweiten Gelenkarms verändert.

Preferably, it is provided that the two drives can act independently of one another on both the front bevel gear and the rear bevel gear in such a way, preferably synchronously, that

• - pivot the front bevel gear together with the screwed-in front threaded rod via the third joint about the first carrier axis of rotation and the rear bevel gear together with the screwed-in rear threaded rod via the fourth joint about the second carrier axis of rotation for guided adjustment of both articulated arms, and / or
• - the bevel gears rotate about their own axis in such a way that the threaded rods screwed into the respective internal thread are adjusted axially along the third carrier axis of rotation and the fourth carrier axis of rotation, thereby creating a distance between the first joint and the third joint of the first articulated arm and changed between the second joint and the fourth joint of the second articulated arm.

Through a targeted action of the two drives on the bevel gears, either the bevel gears can be pivoted about the respective carrier axes of rotation and thus the entire articulated arm can be pivoted in order to adjust the headrest overall forward or in the x direction, or but rotating the bevel gears around their own (longitudinal center) axis in order to adjust the threaded rods in the axial direction and thus additionally move the headrest in the vertical direction. This provides a flexible adjustment, whereby both movements can also be combined with one another if the two drives are controlled in an appropriately coordinated manner.

Preferably, it is further provided that the transmission unit has two front spur gears lying coaxially to one another on the first carrier axis of rotation, each with axially parallel toothing, and two rear spur gears lying coaxially to one another on the second carrier axis of rotation, each with axially parallel toothing,
wherein the first drive acts via a first output shaft on both one of the two front spur gears and on one of the two rear spur gears and, independently of this, the second drive acts via a second output shaft on both the other front spur gear and the other rear spur gear.

• - mit derselben Drehzahl (größer oder kleiner Null) und mit derselben Drehrichtung ein Verschwenken des ersten Gelenkarms um die erste Träger-Drehachse unter Beibehaltung des Abstandes zwischen dem ersten Gelenk und dem dritten Gelenk des ersten Gelenkarms und des zweiten Gelenkarms um die zweite Träger-Drehachse unter Beibehaltung des Abstandes zwischen dem zweiten Gelenk und dem vierten Gelenk des zweiten Gelenkarms erfolgen kann, oder
• - mit derselben Drehzahl (Betrag größer oder kleiner Null) und unterschiedlicher Drehrichtung ein Verändern des Abstandes zwischen dem ersten Gelenk und dem dritten Gelenk des ersten Gelenkarms und zwischen dem zweiten Gelenk und dem vierten Gelenk des zweiten Gelenkarms erfolgen kann, ohne dass der erste Gelenkarm und der zweite Gelenkarm um die erste und die zweite Träger-Drehachse verschwenken, oder
• - mit unterschiedlicher Drehzahl ein Verändern des Abstandes zwischen dem ersten Gelenk und dem dritten Gelenk des ersten Gelenkarms und zwischen dem zweiten Gelenk und dem vierten Gelenk des zweiten Gelenkarms sowie ein gleichzeitiges Verschwenken des ersten Gelenkarms und des zweiten Gelenkarms um die erste und die zweite Träger-Drehachse erfolgen kann. Auf diese Weise können je nach Ansteuerung der Antriebe beliebige Verstellungen der Kopfstütze in x-Richtung und z-Richtung dargestellt werden.

In this way, a targeted adjustment of the bevel gears can be carried out via the spur gears in order to achieve the pivoting or twisting of the bevel gears described above. In particular, it can be provided that the transmission unit is designed in such a way that when the first drive and the second drive or the first drive shaft and the second drive shaft are actuated

• - at the same speed (greater than or less than zero) and with the same direction of rotation, the first articulated arm is pivoted about the first carrier axis of rotation while maintaining the distance between the first joint and the third joint of the first articulated arm and the second articulated arm can take place about the second carrier axis of rotation while maintaining the distance between the second joint and the fourth joint of the second articulated arm, or
• - With the same speed (amount greater than or less than zero) and different direction of rotation, the distance between the first joint and the third joint of the first articulated arm and between the second joint and the fourth joint of the second articulated arm can be changed without the first articulated arm and the second articulated arm pivots about the first and second carrier rotation axes, or
• - changing the distance between the first joint and the third joint of the first articulated arm and between the second joint and the fourth joint of the second articulated arm at different speeds and simultaneously pivoting the first articulated arm and the second articulated arm about the first and second supports - Axis of rotation can be done. In this way, depending on the control of the drives, any adjustments of the headrest in the x-direction and z-direction can be displayed.

In order to achieve this, it is preferably further provided that the two front spur gears both mesh with the front bevel gear via an additional bevel gear and the two rear spur gears both mesh with the rear bevel gear via an additional bevel gear, with the two front spur gears with the bevel gear on opposite ones Sides on the front bevel gear and the two rear spur gears with the bevel gear teeth rest on opposite sides of the rear bevel gear, and thus accommodate or enclose the respective bevel gear between them. Depending on how the two bevel gear teeth of the respective spur gear act on the front or rear bevel gear, either a rotation of the bevel gear about its own axis and / or a pivoting of the bevel gear and thus the entire articulated arm is caused. In this way, flexible adjustment of the headrest can be achieved with little space and few transmission components.

It is preferably further provided that the first output shaft and the second output shaft each have a lower thread region and an upper thread region, the lower thread region meshing with the axially parallel toothing on the respective front spur gear and the upper thread region meshing with the axially parallel toothing on the respective rear spur gear , so that when the output shaft rotates due to an actuation of the respective drive, both the respective front spur gear and the respective rear spur gear rotate. In this simple way, a permanently synchronized effect on both articulated arms can take place or be ensured without the need for additional components. Preferably, it is also provided that all spur gears with the respective toothing (axially parallel and bevel gearing) are essentially identical, so that the movement of the output shaft is transmitted to all spur gears and thus also articulated arms in the same way, resulting in a synchronous movement.

Preferably, it is then also provided that the lower threaded region of an output shaft and the upper threaded region of the same output shaft have an opposite direction of rotation, so that the respective front spur gear and the respective rear spur gear, which cooperate with the same output shaft, when the respective drive is actuated twist in the same direction. This means that no additional translation mechanism is required to pivot the articulated arms synchronously via the gear unit in the same direction or to lengthen or shorten them axially. The structure of the transmission unit is therefore very compact and simple overall, so that the overall design effort can be kept low.

Preferably, it is further provided that the front bevel gear is rotatably received in a receptacle of a front carrier about the third carrier axis of rotation, preferably via a front bevel gear shaft, and the rear bevel gear is rotatably received in a receptacle of a rear carrier about the fourth carrier axis of rotation , preferably via a rear bevel gear shaft, with the front carrier being mounted on the backrest connection so as to be pivotable about the first carrier axis of rotation and the rear carrier about the second carrier axis of rotation. Each articulated arm is then formed by the threaded rod, the bevel gear and the carrier that holds the respective components, bevel gear and threaded rod. This articulated arm is then preferably articulated on both sides of the backrest connection via the spur gears. Preferably, it can also be provided that the front carrier is pivotally mounted on the backrest connection via a spur gear shaft of at least one of the front spur wheels and the rear carrier is pivotally mounted on the backrest connection via a spur gear shaft of at least one of the rear spur wheels.

These spur gears can then advantageously also be used to synchronously actuate the articulated arms or the four-bar linkage formed thereby by the drives. Such a gear unit, which is similar to a differential gear, can therefore enable flexible and compact adjustment in an automated manner.

• 1 eine Rückenlehne eines Fahrzeugsitzes mit einer Kopfstütze in einer Seitenansicht;
• 2 eine perspektivische Ansicht der Kopfstütze aus 1;
• 3a, 3b Detailansichten einer Verstelleinrichtung zur Verstellung der Kopfstütze gemäß 1;
• 4 eine Rückansicht der Kopfstütze aus 1; und
• 5a-d unterschiedliche Stellungen der Kopfstütze aus 1.

The invention is explained below using an embodiment using the accompanying drawings. Show it:

• 1 a backrest of a vehicle seat with a headrest in a side view;
• 2 a perspective view of the headrest 1 ;
• 3a , 3b Detailed views of an adjusting device for adjusting the headrest according to 1 ;
• 4 a rear view of the headrest 1 ; and
• 5a-d different positions of the headrest 1 .

1 shows a backrest 1 of a vehicle seat 2, with a headrest 3 adjustable via an adjusting device 100 being arranged on the backrest 1. The headrest 3 can according to the perspective view in 2 can be adjusted automatically by a drive unit 4 of the adjusting device 100 both in an x-direction X or in a horizontal direction (with respect to the backrest 1) and in a z-direction Z or in a vertical direction. It is provided that the drive unit 4 is arranged outside the headrest 3; according to the illustrated embodiment within the backrest 1.

For this purpose, a backrest connection 5 with a housing 5a is provided on the top side of the backrest 1, in which the drive unit 4 is accommodated. The drive unit 4 in turn is operatively connected to a four-bar linkage 6 of the adjusting device 100 via a gear unit 7 arranged on the backrest connection 5, with a parallelogram guide 6a being used as a four-bar linkage 6 in the illustrated embodiment. The four-bar linkage 6 or the parallelogram guide 6a has two articulated arms A, B, which run parallel to one another (in the X-Z plane) and each have a threaded rod 8a, 8b.

A first threaded rod 8a is articulated via a first joint Ga and a second threaded rod 8b via a second joint Gb to a headrest connection 3a of the headrest 3, for example via pins or shafts or shafts. In addition, the threaded rods 8a, 8b are accommodated in the gear unit 7 in such a way that the two articulated arms A, B are articulated to the backrest connection 5 via the gear unit 7 in a third joint Gc and a fourth joint Gd. Via the parallelogram guide 6a designed in this way, the headrest 3 is held on the backrest 1 during its adjustment in the x-direction X and/or z-direction Z while maintaining its angular position on the backrest 1, as explained in more detail below:

The drive unit 4 of the adjusting device 100 has a first drive 4a with a first output shaft 9 and a second drive 4b with a second output shaft 10. The drives 4a, 4b can be controlled independently of one another, with the output shafts 9, 10 then rotating independently of one another on the left or right side depending on the control of the respective drive 4a, 4b. At the end, each output shaft 9, 10 has a (spindle-shaped) threaded area 9a, 10a, which is as in 3a , 3b shown in detail is divided into a lower thread area 9a1, 10a1 and an upper thread area 9a2, 10a2, the direction of rotation of the upper thread area 9a2, 10a2 differing from that of the lower thread area 9a1, 10a1.

The transmission unit 7 has, as in particular in 2 , 3a and 3b shown a front carrier 11 and a rear carrier 12. According to 3a A front and a rear spur gear 13, 14, each with an axially parallel toothing 13a, 14a, is rotatably mounted on a side flank 11a, 12a of both carriers 11, 12 via a spur gear shaft 13b, 14b. The respective spur gear shaft 13b, 14b is not only slidably received in a bore 15 in the side flank 11a, 12a of the respective carrier 11, 12, but also in a bore 16 in the housing 5a, as in 4 shown. As a result, both the respective carrier 11, 12 and the respective spur gear 13, 14 can be rotated relative to the housing 5a about a first carrier axis of rotation D1 or a second carrier axis of rotation D2.

As in 3b shown, the front or rear spur gear 13, 14, which is rotatably mounted on the respective side flank 11a, 12a, lies within the housing 5a parallel or coaxial to a further front or rear spur gear 13, 14, which also has axially parallel teeth 13a, 14a and is essentially identical to it. These two further spur gears 13, 14 are also slidably mounted in a bore 16 on the opposite side in the housing 5a via a spur gear shaft 13b, 14b, as shown in 4 shown. This allows the two front spur gears 13 to rotate around the same first axis of rotation D1 relative to the housing 5a and rotate the two rear spur gears 14 about the same second axis of rotation D2 relative to the housing 5a. In addition to the illustrated embodiment, it would be possible for the respective carrier 11, 12 to be slidably mounted on both spur gear shafts 13b, 14b not only on one side (via the side flanks 11a, 12a shown), but on both sides (via additional opposite flanks).

On the free surfaces of the front and rear spur gears 13, 14, which face each other, is as in 3a , 3b and 4 shown each has a bevel gear toothing 13c, 14c. This bevel gear toothing 13c, 14c engages in a bevel gear 17, 18 on the respective carrier 11, 12, with the respective bevel gear 17, 18 on an upper flank 11b, 12b and a lower flank 11c, 12c of the respective carrier 11, 12 by a third or fourth carrier axis of rotation D3, D4 is rotatably mounted. For this purpose, a bevel gear shaft 17a, 18a of the respective bevel gear 17, 18 is in receptacles 19 in the respective flank 11b, 11c, 12b, 12c, which in the exemplary embodiment shown is U-shaped (open perpendicular to the x direction X and z direction Z). are recorded glidingly. The third and fourth carrier rotation axes D3, D4 are aligned parallel to one another and perpendicular to the front and rear rotation axes D1, D2.

As a result, the gear unit 7 is designed in the manner of an angular gear, with which a torque can be redirected by 90°. The axially parallel toothing 13a, 14a on the respective spur gear 13, 14 engages in the thread areas 9a, 10a of the respective output shaft 9, 10 and the bevel gear toothing 13c, 14c on the respective spur gear 13, 14 engages in the respective bevel gear 17, 18. One through the The rotary movement of the respective output shaft 9, 10 caused by the respective drive 4a, 4b can thereby be converted into a rotary movement of the respective bevel gear 17, 18 or the respective bevel gear shaft 17a, 18a. Since the two front spur gears 13 act simultaneously on the front bevel gear 17 from opposite sides and the two rear spur gears 14 simultaneously act on the rear bevel gear 18 from opposite sides, the movement of the respective bevel gear 17, 18 depends on how the two drives 4a, 4b are controlled or how the two output shafts 9, 10 rotate relative to one another, comparable to a differential gear, as explained below.

The bevel gear shafts 17a, 18a also each have an internal thread 17b, 18b, with the front threaded rod 8a leading to the headrest 3 in the front internal thread 17b of the front bevel gear shaft 17a and the rear threaded rod leading to the headrest 3 in the rear internal thread 18b of the rear bevel gear shaft 18a 8b is screwed in. The two threaded rods 8a, 8b mounted on the headrest connection 3a, the bevel gear shafts 17a, 18a and the two supports 11, 12 mounted on the backrest connection 5 therefore form the articulated arms A, B, which are attached to the respective joint as described Ga, Gb, Gc, Gd are pivotally connected or articulated to the backrest connection 5 or to the headrest connection 3a in order to provide the parallelogram guide 6 as a four-bar linkage 6. A rotation of the respective bevel gear shaft 17a, 18a then also causes an axial adjustment of the respective threaded rod 8a, 8b along the third or fourth carrier axis of rotation D3, D4, since the respective threaded rod 8a, 8b is in the respective internal thread 17b, 18b screwed in or out.

• Werden ausgehendend von der Stellung der Kopfstütze 3 in 5a beide Antriebe 4a, 4b so angetrieben, dass sich die Ausgangswellen 9, 10 mit derselben Drehzahl Na, Nb (Na = Nb) in dieselbe Drehrichtung Ra, Rb (Ra = Rb beispielsweise im Uhrzeigersinn) verdrehen, drehen sich die beiden vorderen Stirnräder 13 und die beiden hinteren Stirnräder 14, die mit ihrer achsparallelen Verzahnung 13a, 14a an den Gewindebereichen 9a; 9a1, 9a2, 10a; 10a1, 10a2 der jeweiligen angetriebenen Ausgangswelle 9, 10 anliegen, jeweils mit derselben Drehgeschwindigkeit in dieselbe Richtung (aufgrund des gegensätzlichen Drehsinns der Gewindebereiche 9a1, 9a2, 10a1, 10a2). Die beiden vorderen Stirnräder 13 (bzw. die beiden hinteren Stirnräder 14) verhindern dann aufgrund desselben Drehsinns eine Drehbewegung des vorderen Kegelzahnrades 17 (bzw. des hinteren Kegelzahnrades 18) um die dritte Träger-Drehachse D3 (bzw. die vierte Träger-Drehachse D4).

This described structure of the adjusting device 100 with the four-bar linkage 6 or the parallelogram guide 6a enables the headrest 3 to be adjusted relative to the backrest 1 as follows:

• Starting from the position of the headrest, 3 in 5a Both drives 4a, 4b are driven in such a way that the output shafts 9, 10 rotate at the same speed Na, Nb (Na = Nb) in the same direction of rotation Ra, Rb (Ra = Rb, for example clockwise), the two front spur gears 13 and the two rear spur gears 14, which with their axially parallel teeth 13a, 14a on the thread areas 9a; 9a1, 9a2, 10a; 10a1, 10a2 of the respective driven output shaft 9, 10, each with the same rotational speed in the same direction (due to the opposite direction of rotation of the thread areas 9a1, 9a2, 10a1, 10a2). The two front spur gears 13 (or the two rear spur gears 14) then prevent rotation of the front bevel gear 17 (or the rear bevel gear 18) about the third carrier axis of rotation D3 (or the fourth carrier axis of rotation D4) due to the same direction of rotation. .

As a result, depending on the common direction of rotation of the spur gears 13, 14, a torque acts on the respective bevel gear 17, 18 forwards or backwards or around the first or around the second carrier axis of rotation D1, D2. Since the respective bevel gear 17, 18 is connected to the respective carrier 11, 12 via the receptacle 19, the carrier 11, 12 mounted on the housing 5a pivots forwards or backwards together with the respective bevel gear 17, 18 due to the acting torque first and second carrier rotation axes D1, D2. The ones in the respective bevel gear Threaded rods 8a, 8b screwed into shafts 17a, 18a then also pivot about the first or second carrier axis of rotation D1, D2 while maintaining their parallel position. The respective articulated arm A, B is pivoted by its articulation on the backrest connection 5 via the third or fourth joint Gc, Gd.

The threaded rods 8a, 8b then also rotate on the top side around the first or second joint Ga, Gb on the headrest 3 or on the headrest connection 3a, so that a movement of the headrest 3 guided by the four-bar linkage 6 or the parallelogram guide 6a into the in 5b position shown is effected. The headrest 3 is therefore essentially adjusted in the x direction results.

The direction of rotation Ra, Rb of the output shafts 9, 10 is based on 5b set in opposite directions via the drives 4a, 4b (Ra = Rb both counterclockwise), the headrest 3 is adjusted backwards again in the x direction X and at the same time slightly vertically upwards again in the direction of the starting position 5a .

Starting from the position of the headrest, 3 in 5a Both drives 4a, 4b are driven in such a way that the output shafts 9, 10 rotate at the same speed Na, Nb (Na = Nb) in different directions of rotation Ra, Rb (Ra clockwise, Rb = counterclockwise), the two front ones rotate Spur gears 13 each rotate at the same speed in different directions and the two rear spur gears 14 also rotate in opposite directions. This causes a rotational movement of the front bevel gear 17 on the front carrier 11 (or the rear bevel gear 18 on the rear carrier 12) about the third carrier axis of rotation D3 (or the fourth carrier axis of rotation D4).

If the two speeds Na, Nb are exactly coordinated with one another with opposite rotation (Ra =/= Rb), the spur gears 13, 14 only cause the respective bevel gear 17, 18 to rotate about the third carrier axis of rotation D3 (or the fourth carrier axis). Axis of rotation D4). As a result, the threaded rods 8a, 8b, which are attached to the first and second joints Ga, Gb on the headrest connection 3a, screw in such a way that they cannot rotate about the third or fourth carrier axis of rotation D3, D4, depending on Direction of rotation Ra, Rb of the output shafts 9, 10 via the internal threads 17b, 18b axially downwards or upwards from the bevel gear shafts 17a, 18a, without the carriers 11, 12 and thus also the entire articulated arms A, B around the first or the Pivot the second carrier rotation axis D1, D2.

This results, for example, in the position of the headrest 3 in 5c . The headrest 3 is therefore essentially adjusted in the z-direction Z (downwards), with the angled position of the threaded rods 8a, 8b also resulting in a slight adjustment of the headrest 3 in the x-direction (towards the rear).

The two movements of the headrest 3 described with synchronous or asynchronous rotation of the drive shafts 9, 10 can be combined with one another in a corresponding manner, for example, from the position in 5a or 5c immediately into the position according to 5d to get. If the speed Na, Nb of the output shafts 9, 10 is set differently with the same direction of rotation Ra, Rb, for example, the difference in the speeds (relative speed difference) results in both a rotation of the respective bevel gear 17, 18 about the third carrier axis of rotation D3 ( or the fourth carrier axis of rotation D4) as well as pivoting the carriers 11, 12 about the first or second carrier axis of rotation D1, D2.

Due to the set speeds Na, Nb or their relative differences, the threaded rods 8a, 8b become axial on the one hand through the rotating internal threads 17b, 18b from the bevel gear shafts 17a, 18a along the third and fourth carrier rotation axes D3, D4 adjusted as well as the entire articulated arms A, B are pivoted forwards or backwards in the x direction This can also be combined with different directions of rotation Ra, Rb of the output shafts 9, 10 in order to specify the respective direction for the adjustment.

In this way, by varying the speeds Na, Nb of the two output shafts 9, 10 and/or by varying the directions of rotation Ra, Rb of the two output shafts 9, 10, different positions of the headrest 3 in the x direction . This is done by appropriately automated control of the drives 4a, 4b. Since both the rear and front spur gears 13, 14 are always driven equally via the output shafts 9, 10, the four-bar linkage 6 remains unchanged in its basic structure and mode of operation, that is, the threaded rods 8a, 8b remain parallel to one another and also the length between them the respective joints Ga, Gb, Gc, Gd is for both joints poor A, B always identical. As a result, the shape of a parallelogram guide 6a shown in the exemplary embodiment is permanently maintained.

Reference symbol list

1

backrest

2

Vehicle seat

3

headrest

3a

Headrest connection

4

Drive unit

4a

first drive

4b

second drive

5

Backrest connection

5a

Housing

6

Four-bar linkage

6a

Parallelogram guidance

7

Gear unit

8a

front threaded rod

8b

rear threaded rod

9

first output wave

9a

Thread area of the first output shaft 9

9a1

lower thread area of the first output shaft 9

9a2

upper thread area of the first output shaft 9

10

second output wave

10a

Thread area of the second output shaft 10

10a1

lower thread area of the second output shaft 10

10a2

upper thread area of the second output shaft 10

11

front strap

11a

lateral flank of the front support 11

11 b

upper flank of the front beam 11

11c

lower flank of the front beam 11

12

rear carrier

12a

lateral flank of the rear carrier 12

12b

upper flank of the rear beam 12

12c

lower flank of the rear beam 12

13

front spur gear

13a

axially parallel teeth on the front spur gear 13

13b

Spur gear shaft on the front spur gear 13

13c

Bevel gear teeth on the front spur gear 13

14

rear spur gear

14a

axially parallel teeth on the rear spur gear 14

14b

Spur gear shaft on the rear spur gear 14

14c

Bevel gear teeth on the rear spur gear 14

15

Hole in the side flank 11a, 12a

16

Hole in housing 5a

17

front bevel gear

17a

front bevel gear shaft

17b

front internal thread

18

rear bevel gear

18a

rear bevel gear shaft

18b

rear internal thread

19

Recording (e.g. U-shaped)

100

Adjustment device

A

first articulated arm

b

second articulated arm

D1

first carrier axis of rotation

D2

second carrier rotation axis

D3

third carrier rotation axis

D4

fourth carrier rotation axis

Ga

first joint

Gb

second joint

Gc

third joint

Gd

fourth joint

N/a

Speed of the first drive shaft 9

Nb

Speed of the second drive shaft 10

Ra

Direction of rotation of the first drive shaft 9

Rb

Direction of rotation of the second drive shaft 10

X

x direction/horizontal direction

Z

z direction/vertical direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was 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

• EP 3372445 A1 [0002]
• EP 0303145 A1 [0002]
• DE 102015109656 A1 [0003]
• DE 102016119383 A1 [0004]

Claims (14)

Adjusting device (100) for a headrest (3) of a vehicle seat (2), the adjusting device (100) having at least: - a headrest connection (3a) for attachment to the headrest (3), with a first articulated arm (A). a first joint (Ga) and a second articulated arm (B) are connected to the headrest connection (3a) via a second joint (Gb), - a backrest connection (5) for attachment to a backrest (1) of the vehicle seat ( 2), the first articulated arm (A) being linked to the backrest connection (5) via a third joint (Ga) and the second articulated arm (B) being linked to the backrest connection (5) via a fourth joint (Gd), so that a four-bar linkage (6) and - an electrically controllable drive unit (4), which is designed to act on the two articulated arms (A, B) in such a way that the headrest connection (3a) faces each other when the drive unit (4) is actuated the backrest connection (5) is adjusted, characterized in that a gear unit (7) is arranged on the backrest connection (5), wherein - a first drive (4a) of the drive unit (4) via the gearbox Unit (7) acts on both the first articulated arm (A) and the second articulated arm (B) and, independently of this, a second drive (4b) of the drive unit (4) via the gear unit (7) also acts on both acts on the first articulated arm (A) as well as on the second articulated arm (B), the two drives (4a, 4b) being able to be controlled independently of one another in order to guide the headrest connection (3a) via the gear unit (7). Four-bar linkage (6) can be adjusted relative to the backrest connection (5). Adjusting device (100). Claim 1 , characterized in that the first articulated arm (A) and the second articulated arm (B) run parallel to one another and/or are of the same length and/or the four-bar linkage (6) forms a parallelogram guide (6a) to maintain the angular position of the headrest connection ( 3a) when the drives (4a, 4b) are actuated. Adjusting device (100). Claim 1 or 2 , characterized in that the first drive (4a) and the second drive (4b) are each designed to adjust the two articulated arms (A, B) synchronously and / or simultaneously. Adjusting device (100) according to one of the preceding claims, characterized in that the two drives (4a, 4b) are each independent of one another via the third joint (Gc) and the fourth joint (Gd) of the four-bar linkage (6), which are located within the transmission Unit (7) lie, act on the two articulated arms (A, B). Adjusting device (100) according to one of the preceding claims, characterized in that the gear unit (7) has: - a front bevel gear (17) which can be pivoted within the gear unit (7) about a first carrier axis of rotation (D1). is connected to the housing connection (5), the third joint (Gc) lying on the first carrier axis of rotation (D1), and - a rear bevel gear (18), which is connected to a second within the gear unit (7). Carrier axis of rotation (D2) is pivotally connected to the housing connection (5), the fourth joint (Gd) lying on the second carrier axis of rotation (D2), with a front threaded rod (8a) in a front internal thread (17b) of the front bevel gear (17) is screwed along a third carrier axis of rotation (D3) and a rear threaded rod (8b) is screwed into a rear internal thread (18b) of the rear bevel gear (18) along a fourth carrier axis of rotation (D4), whereby the front threaded rod (8a) as part of the first articulated arm (A) and the rear threaded rod (8b) as part of the second articulated arm (B) each lead to the headrest connection (3a). Adjusting device (100). Claim 5 , characterized in that the two drives (4a, 4b) can act independently of one another on both the front bevel gear (17) and the rear bevel gear (18) in such a way that - the front bevel gear (17) together with the screwed-in front threaded rod (8a) via the third joint (Gc) around the first carrier axis of rotation (D1) and the rear bevel gear (18) together with the screwed-in rear threaded rod (8b) via the fourth joint (Gd) around the second carrier axis of rotation (D2 ) pivot for the guided adjustment of both articulated arms (A, B), and/or - the bevel gears (17, 18) rotate about their own axis in such a way that the threaded rods (8a, 8b) screwed into the respective internal thread (17b, 18b) can be adjusted axially along the third carrier axis of rotation (D3) and the fourth carrier axis of rotation (D4), thereby creating a distance between the first joint (Ga) and the third joint (Gc) of the first articulated arm (A) and between the second Joint (Gb) and the fourth joint (Gd) of the second articulated arm (B) changed. Adjusting device (100). Claim 5 or 6 , characterized in that the gear unit (7) has two coaxially positioned on the first carrier axis of rotation (D1). whose spur gears (13) each have an axially parallel toothing (13a) and two rear spur gears (14) lying coaxially to one another on the second carrier axis of rotation (D2), each with an axially parallel toothing (14a), the first drive (4a) being via a first output shaft (9) acts on both one of the two front spur gears (13) and one of the two rear spur gears (14) and, independently of this, the second drive (4b) acts on both the other front one via a second output shaft (10). Spur gear (13) as well as the other rear spur gear (14). Adjusting device (100). Claim 7 , characterized in that the two front spur gears (13) both mesh on the front bevel gear (17) via an additional bevel gear toothing (13c) and the two rear spur gears (14) both mesh on the rear bevel gear (18.) via an additional bevel gear toothing (14c). ), with the two front spur gears (13) with the bevel gear teeth (13c) on opposite sides of the front bevel gear (17) and the two rear spur gears (14) with the bevel gear teeth (14c) on opposite sides of the rear bevel gear (18 ), and the two front and two rear spur gears (13, 14) are preferably rotatably mounted on the backrest connection (5) about the respective carrier axis of rotation (D1, D2). Adjusting device (100). Claim 7 or 8th , characterized in that the first output shaft (9) and the second output shaft (10) each have a lower thread region (9a1, 10a1) and an upper thread region (9a2, 10a2), the lower thread region (9a1, 10a1) being axially parallel The toothing (13a) on the respective front spur gear (13) meshes and the upper thread area (9a2, 10a2) meshes with the axially parallel toothing (14a) on the respective rear spur gear (14), so that when the output shaft (9, 10 ) due to an actuation of the respective drive (4a, 4b), both the respective front spur gear (13) and the respective rear spur gear (14) are rotated. Adjusting device (100). Claim 9 , characterized in that the lower thread area (9a1, 1 0a1) of an output shaft (9, 10) and the upper thread area (9a2, 10a2) of the same output shaft (9, 10) have an opposite direction of rotation, so that the respective front spur gear ( 13) and the respective rear spur gear (14), which cooperate with the same output shaft (9, 10), rotate in the same direction when the respective drive (4a, 4b) is actuated. Adjusting device (100) according to one of the Claims 5 until 10 , characterized in that the front bevel gear (17) is rotatably received in a receptacle (19) of a front carrier (11) about the third carrier axis of rotation (D3), preferably via a front bevel gear shaft (17a), and the rear bevel gear ( 18) is rotatably accommodated in a receptacle (19) of a rear carrier (12) about the fourth carrier axis of rotation (D4), preferably via a rear bevel gear shaft (18a), the front carrier (11) being rotatable about the first carrier axis of rotation ( D1) and the rear support (12) are mounted on the backrest connection (5) so that they can pivot about the second support axis of rotation (D2). Adjusting device (100). Claim 11 , characterized in that the front carrier (11) via a spur gear shaft (13b) of at least one of the front spur gears (13) and the rear carrier (12) via a spur gear shaft (14b) of at least one of the rear spur gears (14). Backrest connection (5) is pivotally mounted. Adjusting device (100) according to one of the Claims 5 until 12 , characterized in that the transmission unit (7) is designed such that when the first drive (4a) and the second drive (4b) or the first drive shaft (9) and the second drive shaft (10) are actuated - with the same Speed (Na, Nb) and with the same direction of rotation (Ra, Rb) a pivoting of the first articulated arm (A) about the first carrier axis of rotation (D1) while maintaining the distance between the first joint (Ga) and the third joint (Gc) and the second articulated arm (B) about the second carrier axis of rotation (D2) while maintaining the distance between the second joint (Gb) and the fourth joint (Gd), or - with the same speed (Na, Nb) and different direction of rotation (Ra, Rb) the distance between the first joint (Ga) and the third joint (Gc) and between the second joint (Gb) and the fourth joint (Gd) can be changed without the first articulated arm (A) and the second articulated arm (B) pivots about the first and second carrier rotation axes (D1, D2), or - with different speeds (Na, Nb) changing the distance between the first joint (Ga) and the third joint (Gc) and between the second joint (Gb) and the fourth joint (Gd) as well as a simultaneous pivoting of the first articulated arm (A) and the second articulated arm (B) about the first and second carrier rotation axes (D1, D2). Vehicle seat (2) with a backrest (1) and a headrest (3), the headrest (3) having an adjustment device (100) relative to the Backrest (1) is adjustable, in particular via an adjusting device (100) according to one of the preceding claims, wherein the adjusting device (100) has at least: - a headrest connection (3a) attached to the headrest (3), wherein a first articulated arm ( A) are articulated via a first joint (Ga) and a second articulated arm (B) via a second joint (Gb) on the headrest connection (3a), - a backrest connection (5) attached to the backrest (1). the first articulated arm (A) is articulated to the backrest connection (5) via a third joint (Ga) and the second articulated arm (B) via a fourth joint (Gd), so that a four-bar linkage (6) is formed for guided adjustment the headrest (3), and - an electrically controllable drive unit (4), which is not arranged on the headrest (3) and which is designed to act on the two articulated arms (A, B) in such a way that the headrest Connection (3a) with the headrest (3) is adjusted relative to the backrest connection (5) when the drive unit (4) is actuated, characterized in that a gear unit (7) is arranged on the backrest connection (5). is, wherein a first drive (4a) of the drive unit (4) acts via the gear unit (7) on both the first articulated arm (A) and the second articulated arm (B) and, independently of this, a second drive (4b ) the drive unit (4) also acts on both the first articulated arm (A) and the second articulated arm (B) via the gear unit (7), the two drives (4a, 4b) being able to be controlled independently of one another, in order to adjust the headrest connection (3a) with the headrest (3) guided by the four-bar linkage (6) relative to the backrest connection (5) via the gear unit (7).

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