Adjusting unit for an automatic slack adjuster

An adjusting unit (1) for an automatic slack adjuster (100) of a brake (200), in particular of a commercial vehicle drum brake, the adjusting unit comprising:

• a housing (19),
• a worm shaft (2), which is mounted in the housing (19) so as to be movable between two end positions along an axial travel (A),
• a control pinion (9) arranged on the worm shaft,
• a worm (7) arranged on the worm shaft, and
• a freewheel (13), which is designed for power transmission between the control pinion (9) and the worm (7) in a first direction of rotation and for slip between the control pinion (9) and the worm (7) in an opposite, second direction of rotation,
• wherein the worm shaft (2) has a first stop surface (3) and a second stop surface (5), the first stop surface (3) being spaced apart from a corresponding first stop (25) at one of the two end positions of the housing (19), the first stop surface and the second stop surface each configured to be brought into contact with the corresponding first stop (25) or a corresponding second stop (21) of the housing (19) when the worm shaft (2) is moved to one of the two end positions,
• wherein the worm shaft has a sliding bearing section (6) inserted into a guide recess (23) of the housing (19), the sliding bearing section (6) extending from the second stop surface (5) to the corresponding second stop (21) and being in direct contact with the guide recess (23),
• wherein the guide recess (23) is longer than the sliding bearing section (6).

An adjusting unit (1) for an automatic slack adjuster (100) of a brake (200), in particular of a commercial vehicle drum brake, the adjusting unit comprising:

• a housing (19),
• a worm shaft (2), which is mounted in the housing (19) so as to be movable between two end positions along an axial travel (A),
• a control pinion (9) arranged on the worm shaft,
• a worm (7) arranged on the worm shaft, and
• a freewheel (13), which is designed for power transmission between the control pinion (9) and the worm (7) in a first direction of rotation and for slip between the control pinion (9) and the worm (7) in an opposite, second direction of rotation,
• wherein the worm shaft (2) has a first stop surface (3) and a second stop surface (5), the first stop surface (3) being spaced apart from a corresponding first stop (25) at one of the two end positions of the housing (19), the first stop surface and the second stop surface each configured to be brought into contact with the corresponding first stop (25) or a corresponding second stop (21) of the housing (19) when the worm shaft (2) is moved to one of the two end positions,
• wherein the worm shaft has a sliding bearing section (6) inserted into a guide recess (23) of the housing (19), the sliding bearing section (6) extending from the second stop surface (5) to the corresponding second stop (21) and being in direct contact with the guide recess (23),
• wherein the entire sliding bearing section (6) overlaps with the guide recess (23) when the second stop surface (5) is in contact with the corresponding second stop (21).