Drum brake and brake shoe

A drum brake for commercial vehicles, comprising:

• a brake drum with an attaching region configured to arrange the brake drum on a wheel hub, and a shell region with a first contact face;
• and
• a friction lining with a second contact face which faces toward the shell region;
• the first and second contact face being curved along or in a radial plane;
• wherein the friction lining and the shell region are configured to move axially with respect to one another such that the movement takes place at least with a component in the axial direction, and wherein a curvature radii of the first and second contact faces along the radial plane are greater than along a pivoting plane;
• wherein one of the contact faces has a concave configuration and the other of the contact faces has a convex configuration;
• and
• wherein a ratio of the curvature radii of the first and/or second contact faces along the pivoting plane to the curvature radii thereof along the radial plane is between 0.01 and 0.08.