A cone crusher (100; 200) comprising: a crushing head being rotatably arranged about a substantially vertical main shaft (120; 220) and on which crushing head a first crushing liner is mounted; a frame on which a second crushing liner is mounted, such that the first crushing liner and the second crushing liner together defines a crushing gap; an eccentric rotatably arranged about a shaft axis defined by the main shaft (120; 220); a drive unit arranged to rotate said eccentric such that the crushing head, which is rotatably arranged on the eccentric, executes a gyratory pendulum movement for crushing of material introduced into the crushing gap, and a supporting device (160; 260) being arranged inside a cavity (121; 221) of said main shaft, said supporting device being arranged to support the crushing head, and to be displaceable along the shaft axis for adjusting the width of the crushing gap, and wherein the supporting device (160; 260) is transversely supported within the cavity at least at an upper support position at which the upper portion is transversely supported by the main shaft characterised in that the supporting device (160; 260) has an upper portion (162; 262) enclosed by the crushing head, said upper portion being arranged to provide said support to the crushing head, and a lower portion (164; 264) extending downwards within the cavity of the main shaft, wherein the upper portion and the lower portion have different outer dimensions as defined transverse to the shaft axis, such that a pressure-active surface (166; 266) is formed at a transition between the upper portion (162; 262) and the lower portion (164; 264) so as to form a variable-volume compression chamber (168; 268) within the cavity below said pressure-active surface, and in that the supporting device (160; 260) is transversely supported within the cavity at a lower support position at which the lower portion (164; 264) is transversely supported by the main shaft (120; 220). a crushing head being rotatably arranged about a substantially vertical main shaft (120; 220) and on which crushing head a first crushing liner is mounted; a frame on which a second crushing liner is mounted, such that the first crushing liner and the second crushing liner together defines a crushing gap; an eccentric rotatably arranged about a shaft axis defined by the main shaft (120; 220); a drive unit arranged to rotate said eccentric such that the crushing head, which is rotatably arranged on the eccentric, executes a gyratory pendulum movement for crushing of material introduced into the crushing gap, and a supporting device (160; 260) being arranged inside a cavity (121; 221) of said main shaft, said supporting device being arranged to support the crushing head, and to be displaceable along the shaft axis for adjusting the width of the crushing gap, and wherein the supporting device (160; 260) is transversely supported within the cavity at least at an upper support position at which the upper portion is transversely supported by the main shaft characterised in that the supporting device (160; 260) has an upper portion (162; 262) enclosed by the crushing head, said upper portion being arranged to provide said support to the crushing head, and a lower portion (164; 264) extending downwards within the cavity of the main shaft, wherein the upper portion and the lower portion have different outer dimensions as defined transverse to the shaft axis, such that a pressure-active surface (166; 266) is formed at a transition between the upper portion (162; 262) and the lower portion (164; 264) so as to form a variable-volume compression chamber (168; 268) within the cavity below said pressure-active surface, and in that the supporting device (160; 260) is transversely supported within the cavity at a lower support position at which the lower portion (164; 264) is transversely supported by the main shaft (120; 220).