DE102012019810A1 - Seating system for motor vehicle, has additional actuator for driving shaft during accidental force application, where decoupling unit is provided, by which shaft is decoupled during driving of shaft by actuating element - Google Patents

Abstract

The seating system has a backrest and an actuating unit (12) for adjusting the backrest in its inclination relative to a seat part of the seating system. The actuating unit has a shaft (14) and an actuating element (16), where the shaft is coupled with the backrest. The shaft is driven by the actuating element for adjusting the backrest. An additional actuator (26) is provided for driving the shaft during an accidental force application. A decoupling unit is provided, by which the shaft is decoupled during driving of the shaft by the actuating element.

Description

The invention relates to a seat system, in particular a vehicle seat, for a motor vehicle according to the preamble of patent claim 1.

Such seating systems, especially vehicle seats, for motor vehicles are well known from the general state of the art and from the mass production of passenger cars. The seat system comprises at least one backrest and an actuating device for adjusting the backrest in its inclination relative to a seat part of the seat system. In this way, the backrest can be adjusted to a position in which it has a pleasant for a seat occupant inclination relative to the seat part.

The actuating device comprises a shaft coupled to the backrest and an actuating element, wherein the shaft can be driven via the actuating element for adjusting the backrest.

The actuator may include, for example, an electric motor for driving the shaft. Alternatively, the actuating element may comprise a hand wheel, by means of which by rotating the handwheel, the shaft is manually driven. As a result, the backrest is manually adjustable. Furthermore, it is possible that the actuating element comprises at least one spring element for adjusting the backrest. For example, to hold the backrest in a desired position against a spring force caused by the spring element, a locking device is provided.

To adjust the backrest in its inclination, the locking device is unlocked, for example, manually by the seat occupant, so that then the backrest can be adjusted. After a desired position of the backrest is adjusted, the locking device can be locked manually, for example, to hold the backrest in the set position against the Federkraftbeaufschlagung.

Moreover, it is known from the general state of the art to provide a transmission of the actuating device, via which the backrest is adjustable. In this case, the transmission is driven when adjusting the backrest, for example via the shaft. As a result, expended actuating forces and / or operating torques for driving the shaft and thus for adjusting the backrest can be kept low, so that, for example, over the shaft driving the transmission seat occupant or the electric motor has to muster a small actuation force to adjust the backrest. Such a transmission can be designed as a wobble gear.

Of the DE 199 31 894 A1 is to take a seat system in the form of a vehicle seat for a motor vehicle as known, the backrest is adjustable via a coupled to the backrest shaft of an actuator in its inclination. The actuating device comprises an actuating element with an electric motor, from which the shaft can be driven. As a result, an electromotive adjustment of the backrest is realized in its inclination.

It is further provided that the electric motor can be activated by a rear impact and the seat back tilts forward during a rear impact. In addition, a braking device for a braked, subsequent to the forward-tilt of the backrest opposite movement of the backrest is provided to the rear.

In an accidental force application of the motor vehicle, especially in a rear impact this, it is advantageous to adjust the backrest in its inclination and in particular to tilt forward to create a particularly small distance between the backrest and the seat occupant. As a result, the consequences of the accidental application of force to the seat occupant can be kept at least low. In this case, a particularly rapid adjustment of the backrest is advantageous.

However, it has been shown that for the realization of such a rapid adjustment of the backrest, an electric motor for driving the backrest with a particularly high performance and thus must be equipped with a very high power consumption. This also leads to a high weight, a high space requirement and high cost of the electric motor.

It is therefore an object of the present invention to provide a seat system of the type mentioned, in which a particularly fast and weight, cost and space-saving adjustment of the backrest in an accidental force application can be realized.

This object is achieved by a seat system, in particular a vehicle seat, for a motor vehicle having the features of patent claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims.

To a seat system, in particular a vehicle seat, for a motor vehicle in the Generate preamble of claim 1 specified type, in which a particularly fast and cost, weight and space-saving adjustment of the backrest in an accidental force is feasible, according to the invention for an actuator additional actuator for driving the shaft in an accidental force application and a decoupling device are provided , Wherein, by means of the decoupling device, the shaft can be decoupled from the actuating element when the shaft is driven by the actuator. Due to the use of the additional actuator for driving the shaft and thus for adjusting the backrest in terms of their inclination in the accidental application of force, the actuator must not be designed for quick adjustment of the backrest in the accidental application of force. As a result, both the actuator and the additional actuator weight and cost and space can be configured.

Since the actuation of actuator and actuator has only a small space requirement, can be made particularly large in the vehicle longitudinal direction behind the example designed as a vehicle seat seating system provided space. Furthermore, it is possible to realize only a very small distance between the head of the seat occupant and a headrest of the seat system.

In addition, the actuator does not affect the accidental driving of the shaft by the actuator, since the shaft is decoupled from the actuator. Thus, a particularly fast adjustment of the backrest can be realized.

In addition, the seat system by the decoupling of the actuating element of the shaft on a modular structure, so that for example for different variants of the vehicle seat and / or for different construction variants of the motor vehicle, a particularly high number of components can be used as common parts. Moreover, due to the modular structure, conventional vehicle seats can be easily extended by the function of driving the shaft, and thus the backrest, caused by the actuator in the accidental application of force.

The seat system according to the invention also allows the use of a transmission, in particular in the form of a wobble mechanism. The actuator includes z. B. an actuating part in the form of an electric motor or a handwheel, via which the shaft is driven. About the shaft that is the gear drivable, via the gear, the backrest is adjustable in its inclination. The possibility of using the transmission, in particular in the form of the wobble mechanism, makes it possible to realize an efficient and at least largely lossless power transmission, in order thus to adjust the backrest in a normal operation of the seat system in which there is no accidental application of force.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention.

The drawing shows in:

1 a schematic perspective view of a frame of a backrest for a vehicle seat of a passenger car, with an actuator for adjusting the backrest in its inclination relative to a seat portion of the vehicle seat and with an additional actuator for driving a shaft for adjusting the backrest in an accidental application of force, wherein a decoupling device is provided, by means of which the shaft in the actuation of the shaft caused by the actuator can be decoupled from an actuating element of the actuating device;

2 another schematic perspective view of the frame;

3 a schematic perspective view of the actuator; and

4 a detail of a further schematic perspective view of the actuator in an enlarged view.

1 and 2 show a frame 10 for a backrest of a vehicle seat for a passenger car. The vehicle seat also includes a whole 12 designated actuator for adjusting the frame 10 and thus the backrest in its inclination relative to a in 1 and 2 not shown seat part of the seat. By this adjustability, an inclination of the backrest can be adjusted relative to the seat part, which offers a high seating comfort for a seat occupant of the vehicle seat.

As in synopsis with 2 to 4 is recognizable, comprises the actuating device 12 one with the frame 10 coupled wave 14 and an actuator 16 with an actuating part in the form of an electric motor 18 , Furthermore, the actuating device comprises 12 in particular 3 recognizable wobble gear 20 , which is also referred to as a swash plate gear.

To the frame 10 and thus the backrest in its inclination relative to a in 1 and 2 unrecognizable seat part of the vehicle seat to adjust, the shaft 14 from the electric motor 18 driven. In other words, the wave 14 by means of the actuating element 16 drivable. Instead of the electric motor 18 can the actuator 16 also a hand wheel for driving the shaft 14 include. About the handwheel is then the shaft 14 manually drivable by the seat occupant.

In order to keep the operating costs for adjusting the backrest low, is the frame 10 about the wobble gear 20 adjustable, where present the wobble gear 20 in a force and / or torque flow from the shaft 14 to the frame 10 between the wave 14 and the frame 10 is arranged. In other words, the wobble gears 20 over the wave 14 drivable. This also means that the wobble gear 20 over the wave 14 from the operating part present in the form of the electric motor 18 are drivable. In other words, the actuating part acts in the form of the electric motor 18 or the handwheel on the shaft 14 , which in turn on the wobble gear 20 acts.

How out 1 to 3 recognizable, allows the shaft 14 a two-sided drive of the frame 10 , In other words, only at one end of the shaft 14 from the electric motor 18 into the wave 14 and thus unilaterally introduced torques also to the other end of the shaft 14 transfer. To the twist of the shaft 14 to keep low is the wave 14 according to their diameter to design accordingly and, for example, to reinforce. It is on both a left and on a right side a corresponding wobble mechanism 20 provided, which in each case over the wave 14 from the electric motor 18 are driven.

By means of the actuating element 16 ie by means of its electric motor 18 and the wobble gear 20 as well as by means of the wave 14 is the backrest in a so-called normal operation, in which it does not come to an accidental application of force of the passenger car, as needed adjustable by the seat occupant.

In order to automatically adjust the backrest automatically in the event of accidental application of force and in particular in the event of a rear impact of the passenger car, an actuator system is required 24 with an actuator in the form of a pyrotechnic actuator 26 intended. The pyrotechnic actuator 26 drives the wave 14 For example, via at least one lever in an accidental application of force of the passenger car, whereby the frame 10 about the wobble gear 20 is adjusted particularly quickly in the inclination. This makes it possible to pivot the backrest within milliseconds by at least 3 ° to 4 °, so as to reduce a space between the seat occupant and the backrest and in particular between the head of the seat occupant and a held on the backrest headrest of the vehicle seat. So the consequences of the rear impact can be kept at least low.

As a result of this particularly fast adjustability of the backrest is a very good occupant coupling of the seat occupant to the backrest in a rear impact realized. The use of the pyrotechnic actuator 26 allows the realization of fast adjustment without plastic deformation or massively designed actuators and seat structures.

Because the wave 14 the described, two-sided driving the frame 10 also by the pyrotechnic actuator 26 caused driving of the shaft 14 allows a so-called hitting the headrest in the rapid adjustment of the backrest can be avoided. In addition, a tension of the actuator 12 and / or the actuators 24 be avoided with the rest of the vehicle seat with an optionally plastic deformation due to high acceleration forces, which is made possible in particular by the very high gear ratio of the wobble gear in the slow. In this case, the wobble gear 20 For example, a translation of 32 to 1 on.

The wobble gear 20 For example, with a ratio of 32: 1 make it possible to initiate high acceleration forces and adjustment speeds efficiently and at least substantially lossless in the backrest, especially against a translation transmission.

Driving the wave 14 in the case of accidental force application refers to the fact that the shaft 14 shortly after a corresponding accidental application of force is detected by at least one sensor of the passenger car, by means of the pyrotechnic actuator 26 is driven. Alternatively, driving the shaft can be 14 in the case of accidental application of force refer to that the shaft 14 time before or at the time of beginning of a by means of a control unit of the passenger car as inevitable occurring in the future estimated, ie assessed, accidental force application by means of the pyrotechnic actuator 26 is driven. The wave 14 can by means of the pyrotechnic actuator 26 thus already in time before, at the time of beginning or a short time after the actual occurring, accidental force application by means of the pyrotechnic actuator 26 are driven.

The actuators 24 also includes an overrunning clutch 22 To allow, for example, the electromotive or mechanical, ie manual adjustment of the backrest and at the same time by the pyrotechnic actuator 26 caused driving of the shaft 14 to block and thus the pyrotechnic actuator 26 on the wave 14 transmit transferred torque on both sides in the backrest. The overrunning clutch 22 is thus active so long by the actuators 24 no force and / or torque on the shaft 14 is transmitted.

Instead of the pyrotechnic actuator 26 can act as an actuator to drive the shaft 14 in the accidental application of force and a different actuator, such as a spring accumulator, are used.

In addition, a decoupling device 28 with a decoupling element 30 intended. By means of the decoupling device 28 is the wave 14 when passing through the pyrotechnic actuator 26 caused driving of the shaft 14 from the actuator 16 and in particular present from the electric motor 18 decoupled.

The decoupling element 30 is presently designed as a slotted hub element in the form of a slotted in its longitudinal direction sleeve, which in normal operation in a shaft 14 with the actuating element 16 and in particular with the electric motor 18 coupling position is located. In the coupling position, torques between the shaft 14 and the electric motor 18 be transferred, so that the shaft 14 from the electric motor 18 can be driven.

As in particular from 4 recognizable is the wave 14 in a partial region of its longitudinal extension direction on the outer peripheral side of the decoupling element 30 surrounded, ie in the decoupling element 30 added. In the coupling position has the decoupling element 30 an inner diameter in which the shaft 14 is included.

Will now be the wave 14 by means of the pyrotechnic actuator 26 driven by the accidental application of force, so the decoupling element adjusted 30 automatically as a result of the pyrotechnic actuator 26 caused driving of the shaft 14 from the coupling position into a shaft 14 from the electric motor 18 decoupling position. At the same time the decoupling element widens 30 on, so that in the decoupled position relative to the coupling position a larger, the shaft 14 Having outer peripheral side surrounding inner diameter. As a result of this expansion is a frictional connection between the shaft 14 and the decoupling element 30 reduced relative to the coupling position, so that the shaft 14 from the electric motor 18 is decoupled.

In the decoupling position are no or compared to the coupling position only lower torques between the shaft 14 and the electric motor 18 transferable, so the shaft 14 no more of the electric motor 18 is drivable and vice versa.

The decoupling element 30 is thus formed as a hub element, via which the shaft 14 in the coupling position with the electric motor 18 is coupled. In the decoupling position is the shaft 14 from the electric motor 18 decoupled. This can cause the wave 14 from the pyrotechnic actuator 26 about the axis of rotation relative to the electric motor 18 to be turned around. As a result, a particularly fast adjustment of the backrest is possible because the driving of the shaft 14 through the pyrotechnic actuator 26 not by the electric motor 18 is impaired.

The decoupling device 28 is designed as a reversible decoupling device. This means that the decoupling element 30 , which is formed for example of a metallic material, as a result of the pyrotechnic actuator 26 caused driving the shaft 14 elastically resilient and thus reversibly expanded from the coupling position to the decoupling position. After the time by the pyrotechnic actuator 26 caused driving of the shaft 14 springs the decoupling element 30 back, whereby the inner diameter compared to the decoupled position again reduced and the adhesion between the decoupling element 30 and the wave 14 is increased relative to the decoupling position.

This is the adhesion between the shaft 14 and the decoupling element 30 restored, so that by the shaft 14 via the decoupling element 30 again with the electric motor 18 is coupled. As a result, the wave can 14 again by means of the electric motor 18 be driven, so that, for example, the seat occupant after the by the pyrotechnic actuator 26 caused adjustment of the backrest can zurückverstellen this again. This means that the backrest is back in one for the seat occupant comfortable position can be adjusted, so that the passenger car can be moved comfortably.

By the wave 14 and the decoupling element 30 Thus, a shaft-hub connection is created, which is the automatic decoupling of the shaft 14 from the electric motor 18 , ie from the actuating part of the actuating element 16 , and allows the adjustability of the backrest in time after the accidental application of force.

In the present case is the decoupling element 30 a the decoupling element 30 Outer peripheral side at least partially surrounding snap ring 32 associated, which in the coupling position of the decoupling element 30 for the adhesion between the shaft 14 and the decoupling element 30 and thus between the wave 14 and the electric motor 18 (Actuator) provides. Due to the high torque and the high acceleration caused by the pyrotechnic actuator 26 be effected, the decoupling element 30 as well as the snap ring 32 widened, whereby the adhesion is canceled or at least reduced. Time after this movement through the pyrotechnic actuator 26 the decoupling element move 30 and the snap ring 32 back to restore traction.

Alternatively or in addition to the snap ring 32 is also another holding element used to the formation of the frictional connection, the decoupling element 30 on the outer circumference of the shaft 14 to press.

As for adjusting the backrest by the seat occupant, the actuating element 16 and for moving the backrest in an accidental application of force, the pyrotechnic actuator 26 can be used particularly small or small in terms of their weight, their space requirements and their costs. At the same time, enormous forces and a very high kinetic energy can be introduced into the backrest within milliseconds in order to adjust it by a few degrees.

Furthermore, a modular construction is ensured, so that optionally the electric motor 18 or the hand wheel or other operating part can be used to the shaft 14 to drive in normal operation. In addition, the vehicle seat can be used across all series.

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• DE 19931894 A1 [0007]

Claims (6)

Seat for a motor vehicle, with a backrest and with an operating device ( 12 ) for adjusting the backrest in its inclination relative to a seat part of the seat system, wherein the actuating device ( 12 ) a shaft coupled to the backrest ( 14 ) and an actuator ( 16 ), about which for adjusting the backrest, the shaft ( 14 ), characterized in that an additional actuator ( 26 ) for driving the shaft ( 14 ) in the case of accidental application of force and a decoupling device ( 28 ) are provided, by means of which the shaft ( 14 ) by the actuator ( 26 ) caused the shaft to be driven ( 14 ) of the actuating element ( 16 ) can be decoupled. Seat according to claim 1, characterized in that the decoupling device ( 28 ) as a reversible decoupling device ( 28 ) is formed, by means of which the shaft ( 14 ) in terms of time by the actuator ( 26 ) caused the shaft to be driven ( 14 ) with the actuating element ( 16 ) is coupled. Seat according to one of claims 1 or 2, characterized in that the decoupling device ( 28 ) automatically as a result of by the actuator ( 26 ) caused driving of the shaft ( 14 ) from one the wave ( 14 ) with the actuating element ( 16 ) coupling position into a shaft ( 14 ) of the actuating element ( 16 ) decoupled position adjusted. Seat according to claim 3, characterized in that the decoupling device ( 28 ) at least one the wave ( 14 ) outer circumference at least partially surrounding hub element ( 30 ), which expands during movement from the coupling to the decoupling and in the decoupling position relative to the coupling position a larger, the shaft ( 14 ) has surrounding inner diameter. Seat according to one of claims 3 or 4, characterized in that the shaft ( 14 ) in the coupling position at least by means of the decoupling device ( 28 ) caused adhesion with the actuator ( 16 ), wherein the frictional connection is reduced in the decoupling position relative to the coupling position. Seat according to one of the preceding claims, characterized in that the actuator ( 26 ) as a pyrotechnic actuator ( 26 ) is trained.

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