Pneumatically actuable disc brake

A pneumatic disc brake for use with a brake disc to apply brake pads against the brake disc, the disc brake comprising:

• a caliper configured to straddle the brake disc;
• a brake application unit arranged in the caliper, the brake application unit including a brake lever operable by a plunger of a brake cylinder to rotate about an eccentric axis in order to displace a brake-application-side brake pad against the brake disc;
• a self-energizing mechanism having a self-energizing factor selected such that the disc brake automatically releases after a braking event;
• a brake ram coupled to the brake-application-side brake pad;
• and
• first and second pressure rams, each pressure ram being arranged in parallel and at a distance on each side of the brake ram, each pressure ram being supported at one end on the caliper and at another end via a pressure ram bearing ball on the brake pad;
• a guide plate operatively configured to hold the pressure rams, the guide plate being mounted to be displaceable in a brake carrier in an axial direction relative to the brake disc,
• wherein
• the brake lever is supported at least on at least one spherical bearing element mounted in the caliper and forming an eccentric rotational axis, the brake lever pressing against a brake lever bearing ball located closer to a plunger engagement end of the brake lever than the at least one spherical bearing element;
• and
• the brake lever bearing ball is positioned in the brake ram,
• the at least one spherical bearing element comprises two bearing elements that are operatively configured to support the brake lever, the brake lever bearing ball being arranged at a location between the two bearing elements,
• the brake lever comprises spherical caps configured to receive each of the two bearing elements and a bulge configured to receive the brake lever bearing ball, and
• the brake application unit is operatively configured such that when the self-energizing mechanism's self-energizing factor is selected such that the disc brake automatically releases after every braking event, a rotational lever transmission ratio is in a range of about 7:1 to 10:1.