Crusher, crushing shell, and method of attaching crushing shell

A cone crusher having an outer crushing shell and an inner crushing shell forming between them a crushing chamber, the inner crushing shell being supported on a crushing head and clamped thereonto by a retaining arrangement, the crushing head being arranged for rotating about a crushing head axis;

• the retaining arrangement comprising
• a first portion of a threaded joint for self-tightening the retaining arrangement, said first portion being concentric with said crushing head axis and rigidly joined with the crushing head;
• a first portion of a form-fitting engagement arrangement, said first portion being rigidly joined with the inner crushing shell;
• and
• a crushing shell tightener provided with a second portion of said threaded joint and a second portion of said form-fitting engagement arrangement, said form-fitting engagement arrangement rotationally locking the crushing shell tightener to the inner crushing shell, thereby forming a direct form-fitting engagement between said inner crushing shell and said second portion of said threaded joint, for direct transfer of a self-tightening torque from said inner crushing shell to said second portion of said threaded joint via said direct form-fitting engagement, the threaded joint having a threading direction to, when the crusher is operated, press the crushing shell tightener downwards, for applying a clamping pressure of the retaining arrangement upon the inner crushing shell.