Brake device

A brake device comprising:

• a brake caliper having a first leg, a second leg and a connecting section connecting the first leg to the second leg;
• wherein a first frictional surface is arranged on a first inner side of the first leg, and a first actuation surface is arranged on a second inner side of the second leg;
• wherein a pressing part of the brake device on the brake caliper is linearly guided along a first straight line;
• wherein the pressing part has a second frictional surface facing the first frictional surface and a second actuation surface faces away from the second frictional surface;
• wherein a region between the first frictional surface and the second frictional surface is provided for the arrangement of a brake element;
• wherein the brake device has a rotatable spreading element which interacts with the first actuation surface and the second actuation surface;
• wherein, when the spreading element is rotated to actuate the brake device, a first spreading element surface is in direct contact with a first rolling surface and rolls substantially on the first rolling surface, and that the first rolling surface corresponds to the first actuation surface or the second actuation surface;
• wherein a profile of the first spreading element surface forms a first rolling curve;
• wherein the first rolling curve has at least one center of curvature;
• wherein, with at least 80% of an operating angle range of the rotation of the spreading element that takes place to actuate the brake device, the axis of rotation of the spreading element is arranged in front of the center of curvature of a point of contact viewed from the point of contact of the first rolling curve in a direction of the first straight line;
• and
• wherein the first rolling surface spans a plane normal to the first straight line, the spreading element, the pressing part, and the brake caliper arranged so that a further axis of rotation of the spreading element in a starting position and another axis of rotation of the spreading element in an end position are arranged on opposite sides of the plane of the rolling surface.