WO2020094626A2

WO2020094626A2 - Adjustment device for adjusting a headrest position

Info

Publication number: WO2020094626A2
Application number: PCT/EP2019/080207
Authority: WO
Inventors: Hendrik Niemann
Original assignee: Elektrosil Gmbh
Priority date: 2018-11-05
Filing date: 2019-11-05
Publication date: 2020-05-14
Also published as: DE202018106289U1; WO2020094626A3

Abstract

In order to improve an adjustment device for electrically adjusting a headrest position in such a way that the entire adjustment device can be arranged inside the headrest, according to the invention the adjustment device has at least one spindle designed as a threaded spindle and at least one electric motor, and the electric motor is arranged so as to be movable relative to the spindle such that a rotational movement of a rotor of the electric motor causes a translational movement of the electric motor along the spindle, or the spindle is arranged so as to be movable relative to the electric motor such that a rotational movement of a rotor of the electric motor causes a translational movement of the spindle. The adjustment device has a gear mechanism and the gear mechanism is mechanically operatively connected to the spindle in order to convert a rotational movement of the rotor into the translational movement of the electric motor along the spindle or into a translational movement of the spindle.

Description

Adjustment device for adjusting a headrest position

Technical field

The invention relates to an adjusting device for adjusting a headrest position, the adjusting device having at least one spindle designed as a threaded spindle and at least one electric motor, and wherein the electric motor is arranged to be movable relative to the spindle, such that a rotary movement of a rotor of the electric motor causes a translational movement of the electric motor causes along the spindle, or that the spindle is arranged to be movable relative to the electric motor, such that a rotational movement of a rotor of the electric motor causes a translational movement of the spindle.

Furthermore, the invention relates to a headrest for a vehicle seat with an adjusting device for adjusting the headrest position.

The position of headrests of a vehicle seat can usually be adjusted manually. For example, the headrest can be adjusted in relation to its fleas or the inclination of the headrest can be adjusted.

State of the art

Electrically adjustable headrests are also known in the prior art. For this purpose, an electric drive is installed in the backrest of a vehicle seat. Using appropriate controls, the user can control the electric drive and change the headrest position, for example adapt the fleas of the headrest.

Presentation of the invention: task, solution, advantages

The object of the present invention is to improve an adjustment device for the electrical adjustment of a headrest position in such a way that the entire adjustment device can be arranged within the headrest and thus to make the adjustment device more cost-effective and reliable. According to the invention, an adjustment device for the adjustment, in particular for the electrical adjustment, of a headrest position is proposed. The adjusting device has at least one spindle designed as a threaded spindle and at least one electric motor. According to the invention, the electric motor is arranged to be movable relative to the spindle. For this purpose, the electric motor is arranged such that a rotational movement of a rotor of the electric motor causes a translatory movement of the electric motor along the spindle. Alternatively, the spindle can be arranged to be movable relative to the electric motor. Here, a rotary movement of a rotor of the electric motor causes a translational movement of the spindle, that is, a movement of the spindle relative to the electric motor. This is achieved in that the adjusting device has a gear, the gear being in mechanical operative connection with the spindle in order to convert a rotational movement of the rotor into a translatory movement of the electric motor along the spindle or into a translatory movement of the spindle.

In particular, the adjusting device is arranged to be movable relative to the spindle, such that a rotational movement of the rotor of the electric motor causes a translatory movement of the adjusting device along the spindle, or that the spindle is arranged to be movable relative to the adjusting device, such that a rotary movement of a rotor of the electric motor causes a translational movement of the spindle, the transmission being in mechanical operative connection with the spindle in order to convert a rotational movement of the rotor into a translatory movement of the adjusting device along the spindle or into a translatory movement of the spindle.

The adjustment device according to the invention can be provided, for example, for height adjustment of the headrest and / or adjustment of another position, for example the inclination of the headrest. In particular, the adjustment device is provided for adjusting a headrest position of a headrest for a vehicle, for example a car.

Because the electric motor and the adjusting device as a whole can carry out a translatory movement along the spindle, that is to say linearly along the spindle, the headrest can be moved in a particularly simple manner Direction can be moved or adjusted. The adjustment device including the drive, namely the electric motor, is arranged in the headrest itself for this purpose. The headrest itself is moved together with the adjusting device by a fixed or rigid connection of the adjusting device to the headrest. If, on the other hand, the spindle is arranged to be movable relative to the electric motor or to the adjusting device, the spindle is firmly and rigidly connected to the headrest. In the context of the present invention, “firmly connected” is to be understood to mean that components are connected to one another in a rotationally fixed manner such that when one of the components rotates, the other component also rotates.

Compared to the prior art, much lower forces have to be applied to adjust the headrest position. In the case of adjusting devices known in the prior art, the drive is mounted in the backrest of a vehicle seat. To adjust the height position of a headrest, high forces have to be applied by means of the drive installed in the backrest in order to actuate connecting means between the backrest and headrest and thus to adjust the height of the headrest itself. An adjustment of another position, for example the inclination, is also very cumbersome and difficult to achieve. Furthermore, by providing the gear, the rotary movement of the rotor can be translated, especially reduced. This makes it possible for the headrest position to be changed in particularly small steps and slowly.

The electric motor or the adjusting device is preferably arranged such that it can move relative to the spindle such that the rotary movement of the rotor is converted into a translatory movement of the electric motor or the adjusting device itself along the spindle, so that connecting means between the backrest and headrest do not have to be actuated, but instead the headrest itself is moved or adjusted together with the movement of the electric motor or the adjusting device.

A threaded spindle is to be understood as a threaded rod. The spindle, which is designed as a threaded spindle, essentially consists of a cylindrical round rod, on which an external thread, for example a trapezoidal, round, saw, pointed or flat thread, is applied. The electric motor has a stator and a rotor. The rotary movement of the rotor is converted via the gear into a translatory movement of the electric motor or the entire adjustment device along the spindle. For this purpose, the gearbox is mechanically operatively connected to the spindle.

The adjustment device according to the invention saves space in comparison to devices known from the prior art and can therefore be arranged in the headrest itself. Furthermore, the device according to the invention has the advantage that the drive is much quieter compared to drives known from the prior art for adjusting devices for adjusting headrests, since much lower forces have to be used to adjust the headrest position and, in particular, no mechanical connecting means between the backrest and the headrest itself must be moved. The electric motor can be firmly connected to the headrest, so that the entire headrest is moved in translation along the spindle by the movement of the electric motor.

The rotor is preferably arranged around the spindle. In this way, an even more compact arrangement of the adjustment device can be achieved. Furthermore, when the rotor is arranged around the spindle, preferably no additional machine elements, for example a gear wheel connected to the rotor of the electric motor via a shaft, are necessary. The force can be applied from the rotor to the spindle via the gearbox.

The electric motor can be operated at a relatively low speed. For example, the electric motor can be operated at a speed between 100 and 500, particularly preferably between 200 and 400, for example 300, revolutions per minute. Furthermore, no additional vibration decoupling of the electric motor is necessary. The entire arrangement is very precise and robust, since the rotor is preferably arranged around the spindle and additional machine elements need not be provided next to the spindle for driving. Forces acting on the headrest do not change the arrangement of the electric motor relative to the spindle within the headrest, or do so only minimally. A stator of the electric motor is preferably also arranged around the spindle.

The transmission preferably has a drive element, the drive element being fixedly connected to the rotor of the electric motor or to a machine element arranged around the rotor, the machine element being fixedly connected to the rotor, so that rotation of the rotor of the electric motor directly onto the drive element is transmitted. The drive element or the machine element can also be formed in one piece with the output element.

The machine element can in particular be designed in the form of a bell. For example, the rotor can be glued or pressed into the bell. The bell is thus connected to the rotor in such a way that the bell rotates together with the rotor. The bell preferably has the shape of an open hollow cylinder. The bell preferably completely surrounds the rotor and the stator.

The bell preferably has or consists of plastic, in particular a thermoplastic.

In particular, the drive element is fixedly arranged on an end face of the rotor, the rotor and the drive element extending completely around the spindle. By connecting the rotor of the electric motor with the drive element of the transmission, the rotary movement of the rotor is directly transferred into a rotary movement of the drive element, and that at the same angular velocity.

The gear mechanism preferably has an internal thread which engages in an external thread of the spindle and which serves to fix the mechanical operative connection to the spindle. In particular, the transmission has an output element, the output element completely surrounding the spindle. The gear unit can further comprise a spindle nut, the output element being connected to the spindle nut in a fixed, especially non-rotatable manner. In particular, the output element is designed as a hollow cylinder and is pushed over the spindle nut so that it completely surrounds the spindle nut and an inner surface of the output element is in direct contact with an outer surface of the spindle nut. The connection can take place in particular via a radially outward projection of the spindle nut, which engages in a corresponding notch on the radial inside of the output element and thus prevents a rotational relative movement of the spindle nut and output element.

The output element can preferably have an internal thread engaging in the external thread of the spindle. In this case, no spindle nut is required, but the driven element is in direct mechanical operative connection with the spindle and can thus convert a rotational movement of the driven element into a translational movement of the driven element. This causes an overall translational movement of the transmission and, due to the fixed connection to the electric motor, also a translatory movement of the electric motor and also of the entire adjusting device. For the purposes of this invention, a spindle nut and an output element is understood to mean a sleeve-shaped machine element which has an internal thread and is screwed onto the spindle or the external thread of the spindle.

Furthermore, the spindle nut can have an internal thread engaging in the external thread of the spindle in order to establish a mechanical operative connection with the spindle. In this case, the output element has no internal thread engaging in the external thread of the spindle.

Furthermore, the output element and / or the spindle nut preferably have or consist of plastic, preferably a thermoplastic, particularly preferably polyoxymethylene. In particular, the spindle nut and / or the output element are designed to be self-lubricating.

Furthermore, the transmission is preferably designed to reduce a rotary movement of the rotor, so that the angular velocity of the drive element of the transmission is greater than the angular velocity of the output element In particular, the gear is designed as a planetary gear. Above all, the sun gear is designed as a drive element. This means that the sun gear is preferably firmly connected to the rotor and thus directly transmits the rotary movement of the rotor. Furthermore, the planetary gear has a ring gear which is held immovably, in other words fixed to the housing. This means that the rotation of the sun gear causes a rotation of the planet gears arranged around the sun gear.

The planet gears are preferably arranged on a planet gear carrier. The transmission preferably has three planet gears. The planet gears have axes around which they rotate. The axes are also not designed to rotate. By holding the ring gear and rotating the sun gear, the rotation of the sun gear causes the planet gears to rotate. The axes of the planet gears are preferably connected to the output element, which is thus also brought into a rotational movement. The rotational movement is converted into a translational movement of the transmission and the electric motor as well as the entire adjusting device via the output element or a corresponding spindle nut.

Only the gearbox is in a mechanical, especially direct, operative connection with the spindle.

Above all, the electric motor is not mechanically connected to the spindle. In other words, the electric motor has no component that transmits a rotary movement of the rotor directly to the spindle. The rotary motion of the rotor is only transmitted via the gearbox. In particular, the electric motor has no component that has an internal thread that engages in an external thread of the spindle.

The external thread of the spindle preferably has a relatively small pitch. The pitch of the external thread of the spindle is preferably less than 1.0 mm, particularly preferably less than 0.8 mm, and very particularly preferably less than 0.6 mm. For example, the pitch of the external thread of the spindle could be 0.5 mm. The slope is according to the invention in Understand with reference to a metric thread. The pitch is therefore to be understood as the distance between two thread tips or flanks of the external thread of the spindle arranged next to one another. The slope thus corresponds to the distance that the electric motor or the adjusting device travels in the linear direction along the spindle with a complete rotation of the rotor around the spindle.

In particular, the transmission has the effect that the rotary movement of the rotor of the electric motor is converted into a translatory movement. The adjusting device preferably has a housing which can enclose both the electric motor and the transmission. The housing can also completely surround the output element and / or the spindle nut, although this does not necessarily have to be arranged completely within the housing. For example, the output element and / or the spindle nut can protrude from the front of the housing.

In particular, the electric motor and the transmission are firmly connected to one another via a housing, so that a translatory movement of the transmission through the mechanical operative connection with the spindle causes a translatory movement of the electric motor and a translatory movement of the entire adjusting device.

The housing can, in particular, be connected to a part of the electric motor that does not rotate with respect to the rotor, in particular the printed circuit board and / or the stator, and to a non-rotating part of the transmission, for example the ring gear. In this way, the transmission and the electric motor are firmly connected.

In particular, the electric motor is arranged radially spaced from the spindle, wherein the electric motor can be mounted on the spindle above all via at least one bearing. The electric motor is preferably mounted opposite the spindle via two bearings which are arranged at a distance from one another. The bearings are designed in particular as plain bearings and therefore not as ball bearings. The plain bearings preferably have no internal thread. With the at least one bearing, the electric motor and / or stator is on the spindle or the external thread of the spindle stored or guided. The stator preferably encloses at least one bearing circumferentially. The at least one bearing is preferably firmly connected to the stator and / or the printed circuit board.

In particular, the housing can have fastening means for fastening the adjusting device to the headrest. The adjusting device is connected to the interior of the headrest in a fixed, for example rigid, manner via the housing. Such a fastener can be designed, for example, as a flange. This can be arranged on the circumferential side projecting from the housing and have a bore for receiving a screw connection.

Furthermore, it is preferably provided that the stator of the electric motor is arranged on a printed circuit board of the electric motor. The circuit board is used to attach the stator. The stator can be inserted into the housing together with the circuit board. It is therefore preferably provided that the housing also completely surrounds the printed circuit board. The stator can be fastened in the housing, for example, via the printed circuit board. The circuit board also serves to connect individual windings of the stator. Particularly preferably, the circuit board is essentially round and / or has an outer diameter which is less than or equal to the outer diameter of the stator itself. The circuit board preferably also extends completely around the spindle. The circuit board can in particular have the shape of a hollow cylinder, wherein it has a radially outwardly projecting edge on one end face.

The electric motor preferably has at least four, particularly preferably at least six, and very particularly preferably at least eight poles. For example, the electric motor can have 10 or 12 poles. By providing a relatively high number of poles, the torque of the electric motor can be increased and the travel time of the electric motor can be accelerated in the linear or translational direction or the adjusting device along the spindle.

The spindle preferably has a length of at least 10 cm, particularly preferably of at least 12 cm, and very particularly preferably of at least 15 cm. In this way, an adjustment path, in particular for a suitable height adjustment, of the headrest can be provided.

The spindle preferably has or consists of plastic, particularly preferably a thermoplastic, and very particularly preferably polyoxymethylene (POM).

It is also preferably provided that, for further noise reduction, an insulation means for noise insulation is arranged on the inside of the housing of the adjustment device. For example, an insulating means could be arranged flat on the inside of the housing, for example glued on. The electric motor can also have a further housing, which is arranged within the housing of the adjusting device. Alternatively or additionally, this housing can also have soundproofing means.

The adjusting device also preferably has a control unit, the control unit and the electric motor being designed such that a complete rotation of the rotor is achieved by a number of between 6 and 18 pulses. As a result, the electric motor or the adjusting device can be moved in a linear or translational direction along the spindle in particularly fine or small steps.

To detect the position of the electric motor and / or the rotor, the electric motor preferably has at least one Hall sensor, and particularly preferably at most three Hall sensors. The position of the rotor or the rotor magnet in the electric motor can be detected by the at least one Hall sensor. The at least one Hall sensor is therefore in direct operative connection with the rotor magnet for position detection. No additional components, for example additional magnets, are required for position detection. The scanning is preferably provided in the axial direction.

Furthermore, it is preferably provided that the stator of the electric motor and also the at least one Hall sensor are arranged on the printed circuit board of the electric motor. A recess is particularly preferably provided in the circuit board for the scanning. It is also preferably provided that the electric motor is designed as a brushless motor. The electric motor can be designed as an internal rotor motor, that is to say with a stator arranged around the rotor. Alternatively, the electric motor can be designed as an external rotor motor, that is to say with a rotor arranged around the stator. An entire air gap is arranged between the rotor and the stator. Thus, there are preferably no physical connections, for example no sliding contacts, between the rotor and the stator. This provides a particularly low-wear and low-noise drive device. Furthermore, the vibrations can be kept as low as possible.

Particularly preferably, both the spindle and the spindle nut arranged around the spindle and / or the output element are made of plastic. This enables a particularly strong reduction in noise.

The housing can also completely surround the spindle nut, wherein the spindle nut does not necessarily have to be arranged completely within the housing. For example, the spindle nut can protrude from the front of the housing.

The adjustment device can have a further spindle designed as a threaded spindle and a further electric motor as well as a gear mechanism that is mechanically operatively connected to the spindle. It is envisaged that both spindles are identical and aligned identically. The two spindles are particularly preferably arranged parallel to one another. By providing more than one spindle, better stability of the adjustment device for a headrest can be achieved.

Both the further spindle as well as the further electric motor and the further housing can have the above-described features of a spindle or an electric motor. According to the invention, a headrest is also provided for a vehicle seat with a previously described adjustment device. The adjustment device is arranged inside, preferably completely inside, the headrest. The adjusting device is fixed, for example rigidly, connected to the headrest via its housing. The headrest thus follows the movement of the electric motor or the adjusting device in a linear or translational direction along the spindle. The entire headrest, like the electric motor or the adjusting device, is thus movable relative to the spindle. The spindle itself can be connected or connected to connecting means between the headrest and a backrest of the vehicle seat, so that the spindle is not moved together with the headrest and the electric motor or the adjusting device. The spindle is thus preferably arranged within the headrest, but is rigidly connected to a backrest of the vehicle seat. The electrical lines for power supply and control of the adjustment device can be passed through connecting means between the headrest and the backrest of the vehicle seat. For this purpose, the connecting means can in particular be designed as tubes or tubular.

Furthermore, a headrest is preferably provided, the adjustment device being designed for flea adjustment of the headrest and / or for adjusting an inclination of the headrest and / or for moving an element arranged in the headrest. An element arranged in the headrest can be provided, for example, in the form of a cushion or a plate in the front area of the headrest. Through the movement, for example pushing forward or pulling back this element arranged in the headrest, the felt position or inclination position of the headrest can be changed for the user. As a result, it is not necessary to actually change the inclination of the entire headrest, but merely to push the front contact surface of the headrest further forward or to move it back.

A headrest with at least two adjustment devices is also preferably provided, the first adjustment device for flea adjustment of the headrest being arranged within it and the second adjustment device for adjusting an inclination of the headrest and / or for moving an element arranged in the headrest within the headrest . In this way, a headrest can be provided, which can be adjusted both in terms of its height and in terms of its inclination or perceived inclination. Both adjustment devices are preferably arranged entirely within the headrest.

Furthermore, a heating module for forming a neck heater is preferably arranged within the headrest.

Brief description of the drawings

The invention will now be explained by way of example with reference to the accompanying drawings using particularly preferred embodiments.

They show schematically:

Fig. 1: a perspective view of an adjusting device

to adjust a headrest position,

Fig. 2: a side view of an adjustment device without

Casing,

3: a side view of an adjustment device without

Housing and Hoh Irad,

Fig. 4: a plan view of a longitudinal section of a

Adjustment device without housing,

5: an exploded view of an adjusting device without

Casing,

6: a headrest of a vehicle seat

Adjustment device for flea adjustment of the headrest, and

Fig. 7: a headrest with adjusting device for actuation

of an element arranged in the headrest. Preferred embodiments of the invention

FIG. 1 shows a perspective view of an adjusting device 100 for adjusting a headrest position.

The adjusting device 100 has a spindle 10 designed as a threaded spindle, an electric motor 11 and a gear 30. The gear 30 is designed as a planetary gear. The electric motor 11 and the gear 30 are arranged in a common housing 20 and are therefore not visible in FIG. 1.

The electric motor 11 is arranged to be relatively movable relative to the spindle 10, such that a rotary movement 14 of the rotor 12 (not shown in FIG. 1) of the electric motor 11 causes a translatory movement 15 of the electric motor 11 along the spindle 10. This is achieved in that the gear 30 has a mechanical operative connection with the spindle 10 in order to convert the rotation of the rotor 12 into a translatory movement of the electric motor 11. Through a fixed connection of a part of the electric motor 11 that does not rotate in comparison to the rotor 12 with a part of the transmission 30 that does not rotate in comparison to the rotor, for example via the common housing 20, not only does the electric motor 11 move along the spindle 10, but also likewise the transmission and the entire adjusting device 100.

By means of fastening means 21 arranged circumferentially on the housing 20 of the adjusting device, the adjusting device 11 can be firmly connected to the headrest 200 (not shown in FIG. 1) via the housing 20 thereof. The headrest 200 thus follows the movement of the adjusting device or is moved together with the electric motor 11 in a linear or translational direction along the spindle 10.

FIG. 2 shows a side view of the adjusting device 100, the housing 20 of the adjusting device having been removed for the sake of a better overview.

The electric motor 11 of the adjusting device 100 can be seen, which comprises a stator 13 (not shown in the figure) and a rotor 12. The electric motor 11 is brushless. That means no mechanical contacts, For example, sliding contacts are provided between the stator 13 and the rotor 12 of the electric motor 11. An air gap is thus provided in full between the stator 13 and the rotor 12.

Both the rotor 12 and the stator 13 are arranged around the spindle 10 and around a printed circuit board 22 of the electric motor 11. Furthermore, a bearing 28 of the electric motor 11 is shown, which also extends completely around the spindle. From the gear 30, only the hollow wheel 36 and a bell 25 can be seen in FIG.

FIG. 3 shows a side view of an adjusting device 100 without a housing 20 and a hollow wheel 36, so that a view is now also given of the planet gear carrier 35, two of three planet gears 34 and the sun gear 32 of the transmission 30.

The sun gear 32 serves as the drive element 31 of the transmission 30. It is fixed, i.e. rigid, connected to the rotor 12 of the electric motor 11, so that a rotational movement of the rotor 12 is transmitted directly to the sun gear 32. The sun gear 32 thus has the same angular velocity as the rotor 12. By rotating the sun gear 32, the planet gears 34 are set in rotation about their axes 34a. The axles 34a, which are rigid in comparison to the rotation of the planet gears 34, are firmly connected to an output element 33 of the transmission 30.

Because the Hoh Irad 36 is rigid, i.e. immovable, is held, the planet gears 34 set the output element 33 in rotation, the angular velocity of which is smaller than that of the sun gear 32, so that the gear 30 serves as a reduction. The output element 33 is fixedly connected to a spindle nut 18 (not visible in FIG. 3), so that the rotation of the output element 33 is transmitted directly to the spindle nut 18. The angular velocity of the output element 33 and the spindle nut 18 are the same size.

The spindle nut 18 has an internal thread 16 which engages in the external thread 17 of the spindle 10 and thus the rotational movement of the spindle nut 18 and also that of the rotor 12 of the electric motor 11 in a translational movement of the electric motor 11 and thus the entire adjusting device 100 along the spindle 10.

The output element is fixed to the bell 25 and can be pressed or glued. The bell 25 is rotated together with the driven element 33 and the spindle nut 18.

The pitch 19 of the external thread 17 of the spindle 10 can be selected to be particularly small, for example 0.5 mm, so that there is a small translation and the adjustment device and thus also the entire headrest 200 (not shown in FIG. 3) can be adjusted in small steps . However, this can be achieved by the gear 30 through the reduction that is possible as a result, even with a large pitch.

In the adjusting device 100 shown in FIGS. 1 to 3, the electric motor 11 is designed as an external rotor motor. The rotor 12 is thus arranged around the stator 13. The stator 13 is seated on the printed circuit board 22. The electric motor 11 has no mechanical operative connection with the spindle 10. For this purpose, the electric motor 11 has no component which engages in the external thread 17 of the spindle 10 through an internal thread 16. The rotation of the rotor 12 is transmitted exclusively via the gear 30.

Furthermore, the electric motor 11 can be designed as an internal rotor motor. The stator 13 is arranged around the rotor 12. In this case, however, the rotor is then firmly connected to the printed circuit board 22, so that it also rotates, or is supported relative to the latter via bearings.

FIG. 4 shows a plan view of a longitudinal section of an adjusting device 100 without a housing 20.

It can be clearly seen how the electric motor 11 is mounted relative to the spindle 10 by means of two bearings 27, 28 arranged at a distance from one another. The bearings 27, 28 are slide bearings. Furthermore, it can be clearly seen from FIG. 4 that the spindle nut 18 has an internal thread 16 which engages in the external thread 17 of the spindle 10. The spindle nut 18 is fixed to the Output element 33 connected, specifically via a radially outwardly projecting projection 18a which engages in a corresponding recess in the output element 33.

FIG. 5 shows an exploded view of an adjustment device 100 without a housing 20.

The components of the electric motor 11, namely the printed circuit board 22, the stator 13 and the rotor 12, are clearly shown, the electric motor 11 being mounted relative to the spindle 10 via the two bearings 27 and 28. Furthermore, the gear 20 is shown with its components, namely the sun gear 22, the planet gear carrier 35, the planet gears 34 and its axes 34a, the high gear 36, the output element 33, the spindle nut 18 and the bell 25.

FIG. 6 shows a headrest 200 with an adjusting device 100 arranged therein for flea adjustment of the headrest 200. The headrest 200 is connected to the backrest 52 of the vehicle seat via two connecting means 51.

Due to the linear or translational movement 15 along the spindle 10 of the electric motor 11 or the entire adjusting device 100 and thus also the entire headrest 200, the flea position of the headrest 200 is changed. For this purpose, the adjustment device 100 is firmly connected to the headrest 200 via the housing 20 thereof. The headrest 200 thus follows the translatory direction of movement 15 of the entire adjustment device 100. The spindle 10 is connected to a connecting means 51 between the headrest 200 and the backrest 52 of the vehicle seat, so that the spindle 10 does not follow any movement when the headrest 200 is adjusted.

The headrest 200 can have two adjustment devices 100 as shown in FIG. 6. For example, an adjusting device 100 could be arranged in the area of each of the two connecting means 51 between the headrest 200 and the backrest 52 of the vehicle seat.

FIG. 7 shows a headrest 200 with an adjustment device 100 arranged therein. In contrast to the embodiment shown in FIG. 6, the embodiment shown in FIG. 7 serves to actuate or move an element 50 within the headrest 200. The position of the headrest 200 is changed in the vertical direction by virtue of the fact that it is arranged inside the headrest 200 element 50 of essentially flat design is pressed outward, thus widening the headrest 200 or withdrawing the element 50. The inclination of the headrest 200 is thus changed for the user, at least emotionally. For this purpose, the housing of the adjustment device 100 is firmly connected to the element 50.

A plurality of adjustment devices 100 can also be provided in a headrest 200. For example, an adjustment device 100 for flea adjustment, as shown in FIG. 6, and also a further adjustment device 100 for actuating the element 50 arranged within the headrest 200 can be arranged in a headrest 200.

Reference symbol list

100 adjustment device

200 headrests

10 spindle

11 electric motor

12 rotor

13 stator

14 Rotatory movement

15 Translational movement

16 internal threads

17 external thread

18 spindle nut

18a lead

19 pitch of the external thread

20 housing

21 fasteners

22 printed circuit board

23 Length of the spindle

25 bell

27, 28 bearings

30 gears

31 drive element

32 sun gear

33 output element

34 planet gears

34a axis

35 planet carriers

36 ring gear

50 element Lanyard between headrest and a backrest of the

Vehicle seat

Backrest of the vehicle seat

Claims

Expectations

1. Adjusting device (100) for adjusting a headrest position, the adjusting device (100) having at least one spindle (10) designed as a threaded spindle and at least one electric motor (11),

wherein the electric motor (11) is arranged to be movable relative to the spindle (10), such that a rotational movement (14) of a rotor (12) of the electric motor (11) translates (15) of the electric motor (11) along the spindle ( 10), or that the spindle (10) is arranged to be movable relative to the electric motor (11), such that a rotary movement (14) of a rotor (12) of the electric motor (11) causes a translatory movement (15) of the spindle (10 ) causes

characterized in that

the adjusting device (100) has a gear (30), the gear

(30) is in mechanical operative connection with the spindle (10) by a rotary movement (14) of the rotor (12) into the translatory movement (15) of the electric motor (11) along the spindle (10) or into a translatory movement (15 ) to convert the spindle (10).

2. adjusting device (100) according to claim 1,

characterized in that

that the rotor (12) is arranged around the spindle (10).

3. adjusting device (100) according to one of claims 1 or 2,

characterized in that

the transmission (30) has a drive element (31), the drive element being fixed (31) to the rotor (12) of the electric motor (11) or to a machine element arranged around the rotor (12) and firmly connected to the rotor , so that a rotational movement (14) of the rotor (12) of the electric motor (11) on the drive element

(31) is transferred.

4. Adjusting device (100) according to one of the preceding claims,

characterized in that the gear (30) has an internal thread (16) which engages in an external thread (17) of the spindle (10) for establishing the mechanical operative connection with the spindle (10).

5. adjusting device (100) according to any one of the preceding claims,

characterized in that

the transmission has an output element (33), the output element (33) completely surrounding the spindle.

6. adjusting device (100) according to claim 5,

characterized in that

that the gear (30) comprises a spindle nut (18), the output element (31) being fixedly connected to the spindle nut (18).

7. adjusting device (100) according to one of claims 5 or 6,

characterized in that

the output element (33) or the spindle nut (11) has an internal thread (16) engaging in the external thread (17) of the spindle (10) for producing the mechanical operative connection with the spindle (10).

8. adjusting device (100) according to one of claims 5 to 7,

characterized in that

that the driven element (33) and / or the spindle nut (18) has or consists of plastic, preferably a thermoplastic, particularly preferably polyoxymethylene.

9. adjusting device (100) according to one of claims 5 to 8,

characterized in that

the spindle nut (18) and / or the driven element (33) are designed to be self-lubricating.

10. Adjusting device (100) according to one of the preceding claims,

characterized in that

the gear (30) is designed to reduce a rotary movement (14) of the rotor (12).

11. Adjusting device (100) according to one of the preceding claims,

characterized in that

the gear (30) is designed as a planetary gear.

12. Adjusting device (100) according to one of the preceding claims,

characterized in that

the electric motor (11) is in no mechanical operative connection with the spindle (10).

13. Adjusting device (100) according to one of the preceding claims,

characterized in that

the electric motor (11) is arranged radially spaced from the spindle (10).

14. Adjusting device (100) according to one of the preceding claims,

characterized in that

the electric motor (11) is mounted on the spindle (10) by means of at least one bearing (27, 28).

15. adjusting device (100) according to claim 14,

characterized in that

the at least one bearing (27, 28) is a plain bearing.

16. Adjusting device (100) according to one of the preceding claims,

characterized in that

the electric motor (11) and the transmission (30) are firmly connected to one another via a housing (20), so that a translatory movement (15) of the transmission causes a translatory movement (15) of the electric motor (11).

17. Adjusting device (100) according to one of the preceding claims,

characterized in that

a pitch (19) of an external thread (17) of the spindle (10) is less than 1.0 mm, preferably less than 0.8 mm, particularly preferably less than 0.6 mm.

18. Adjusting device (100) according to any one of the preceding claims, characterized in that

a housing (20) of the adjusting device (100) has fastening means (21) for fastening the adjusting device (100) to the headrest (200).

19. Adjusting device (100) according to one of the preceding claims,

characterized in that

a stator (13) of the electric motor (11) is arranged on a printed circuit board (22) of the electric motor (11).

20. Adjusting device (100) according to one of the preceding claims,

characterized in that

the electric motor (11) has at least four, preferably at least six, particularly preferably at least eight, and very particularly preferably at least ten poles.

21. Adjusting device (100) according to one of the preceding claims,

characterized in that

the spindle (10) has a length (23) of at least 10 cm, preferably of at least 12 cm, particularly preferably of at least 15 cm.

22. Adjusting device (100) according to one of the preceding claims,

characterized in that

the spindle (10) has plastic, preferably a thermoplastic, particularly preferably polyoxymethylene, or consists thereof; and / or that the spindle (10) is designed to be self-lubricating.

23. Adjusting device (100) according to one of the preceding claims,

characterized in that

On an inside of the housing (20) of the adjusting device (100) and / or a housing of the electric motor (11) an insulating means for noise insulation is arranged.

24. Adjusting device (100) according to one of the preceding claims, characterized in that

the adjusting device (100) has a control unit, the control unit and the electric motor (11) being designed such that a complete revolution of the rotor (12) is achieved by a number of 6 to 18 pulses.

25. Adjusting device (100) according to one of the preceding claims,

characterized in that

the electric motor (11) for detecting the position of the rotor (12) has at least one Hall sensor, preferably at most 3 Hall sensors, which is or are designed for detecting the position of a rotor magnet of the rotor (12) and is or are arranged in the electric motor (11) .

26. Adjusting device (100) according to claim 25,

characterized in that

a stator (13) of the electric motor (11) and the at least one Hall sensor are arranged on a printed circuit board (22) of the electric motor (11).

27. Adjusting device (100) according to one of the preceding claims,

characterized in that

the adjusting device (100) has a further spindle (10a) designed as a threaded spindle, a further electric motor (11a) and a gear (30) that is mechanically operatively connected to the further spindle (10a).

28. Adjusting device (100) according to one of the preceding claims,

characterized in that

the electric motor (11) is designed as a brushless motor and has a stator (13), the electric motor (11) being designed as an internal rotor motor or as an external rotor motor, with an air gap (24) between the rotor (12) and the stator (13) in its entirety ) is arranged.

29. headrest (200) for a vehicle seat with an adjusting device (100) according to one of the preceding claims,

characterized in that

the adjusting device (100) is arranged inside the headrest (200).

30. headrest (200) according to claim 29,

characterized in that

the adjusting device (100) for adjusting the height of the headrest (200) and / or for adjusting an inclination of the headrest (200) and / or for adjusting a depth of the headrest (200) and / or for moving an element arranged in the headrest (200) (50) is formed.

31. headrest (200) according to one of claims 29 or 30,

characterized in that

the headrest (200) has two adjustment devices (100) according to one of claims 1 to 28, wherein the first adjustment device (100) for height adjustment of the headrest (200) is arranged within the headrest (200), the second adjustment device (100a) for Adjustment of an inclination of the headrest (200) and / or to adjust a depth of the headrest (200) and / or to move an element (50) arranged in the headrest (200) within the headrest (200).

32. headrest (200) according to any one of claims 29 to 31,

characterized in that

within the headrest (200) a heating module to form a

Neck heating is arranged.