Adjustment device comprising an asymmetrically acting brake assembly and vehicle seat having such an adjustment device

An adjustment device for a vehicle seat, comprising:

• an output element,
• a drive assembly for introducing a drive torque to be transferred to the output element into the adjustment device, and
• a brake assembly for locking the output element and absorbing, via at least two brake elements adjustably mounted in a brake housing of the brake assembly, forces applied to the output element on the output side,
• wherein, when a drive torque is introduced via the drive assembly, a locking, provided via the brake assembly, of the output element can be released and the output element can be rotated along a direction of rotation, and, in order to lock the output element, the brake elements are in a locking position, in which, when forces are applied on the output side via the output element and are acting along a direction of rotation, at least one of the brake elements bears frictionally against a brake surface of the brake housing,
• wherein a maximum braking torque counteracting an adjustment of the output element is provided via the brake assembly, which braking torque varies in magnitude according to the direction of rotation along which a force acting on the output element on the output side acts, and
• wherein the brake assembly comprises at least two spring elements, via which brake elements of the brake assembly are preloaded against each other, wherein the spring forces acting on the brake elements and applied by the spring elements are of different magnitudes.

An adjustment device for a vehicle seat, comprising:

• an output element,
• a drive assembly for introducing a drive torque to be transferred to the output element into the adjustment device, and
• a brake assembly for locking the output element and absorbing, via at least two brake elements adjustably mounted in a brake housing of the brake assembly, forces applied to the output element on the output side,
• wherein, when a drive torque is introduced via the drive assembly, a locking, provided via the brake assembly, of the output element can be released and the output element can be rotated along a direction of rotation, and, in order to lock the output element, the brake elements are in a locking position, in which, when forces are applied on the output side via the output element and are acting along a direction of rotation, at least one of the brake elements bears frictionally against a brake surface of the brake housing,
• wherein a maximum braking torque counteracting an adjustment of the output element is provided via the brake assembly, which braking torque varies in magnitude according to the direction of rotation along which a force acting on the output element on the output side acts,
• wherein at least three brake elements are provided, each of which comprises at least one brake portion for frictional contact with the brake surface of the brake housing, and
• wherein the brake assembly comprises at least two spring elements with different spring constants, of which a first spring element with a first spring constant preloads a first brake element and a second brake element of the at least three brake elements against each other and a second spring element with a higher, second spring constant preloads a third brake element and the first brake element of the at least three brake elements against each other.