Eccentric assembly for gyratory or cone crusher

1. An eccentric assembly for use in a gyratory or cone crusher,

the gyratory or cone crusher comprising:

a main shaft having a longitudinal extension along a central axis of the crusher,

a head assembly including a crushing head provided with a first crushing shell, and

a frame provided with a second crushing shell, wherein the first crushing shell and the second crushing shell between them define a crushing gap; and

the eccentric assembly being provided with an inner circumferential surface and an outer circumferential surface eccentrically arranged relative to the inner circumferential surface, wherein the inner circumferential surface of the eccentric assembly is arranged for being journalled to the main shaft so that the eccentric assembly is adapted to rotate about said central axis, and wherein the outer circumferential surface of the eccentric assembly is arranged for being journalled to the crushing head,

wherein the eccentric assembly includes a first eccentric part and a second eccentric part which is configured for being spaced apart by a distance from the first eccentric part in a direction along the central axis,

the eccentric assembly further comprises a counterweight assembly including a counterweight body, the counterweight assembly being configured so as to rotate together with the eccentric assembly and being configured so as to compensate for unbalanced forces generated by a gyratory movement of the head assembly and an offset rotation of the eccentric assembly,

wherein the counterweight body is located between the first eccentric part and the second eccentric part as seen in the direction along the central axis.

2. The eccentric assembly of claim 1 , further comprising an intermediate element arranged between the first eccentric part and the second eccentric part in the direction along the central axis, the intermediate element having either a non-eccentric shape or an eccentricity which is different from the eccentricity of the first eccentric part and second eccentric part.

3. The eccentric assembly of claim 2 , in which the intermediate element is coupled to the first eccentric part and/or the second eccentric part so as to rotate together therewith.

4. The eccentric assembly of claim 2 , wherein the intermediate element is formed in one piece with the first eccentric part and/or the second eccentric part.

5. The eccentric assembly of claim 2 , wherein the intermediate element is formed separate from and coupled with the first and/or the second eccentric part.

6. The eccentric assembly of claim 2 , wherein the intermediate element is configured as a sleeve surrounding the main shaft.

7. The eccentric assembly of claim 1 , wherein the counterweight assembly is coupled to the first eccentric part and the second eccentric part so as to rotate together therewith.

8. The eccentric assembly of claim 2 , wherein the counterweight body is coupled to the intermediate element of the eccentric assembly.

9. The eccentric assembly of claim 8 , wherein the counterweight body is formed in one piece with the intermediate element.

10. The eccentric assembly of claim 8 , wherein the counterweight body is formed separate from and coupled with the intermediate element.

11. A gyratory or cone crusher comprising:

a main shaft having a longitudinal extension along a central axis of the crusher,

a head assembly including a crushing head provided with a first crushing shell,

a frame provided with a second crushing shell, wherein the first crushing shell and second crushing shell between them define a crushing gap, and

an eccentric assembly provided with an inner circumferential surface and an outer circumferential surface eccentrically arranged relative to the inner circumferential surface, wherein the inner circumferential surface of the eccentric assembly is journalled to the main shaft so that the eccentric assembly is adapted to rotate about said central axis, and wherein the outer circumferential surface of the eccentric assembly is journalled to the crushing head,

wherein the eccentric assembly includes a first eccentric part and a second eccentric part which is spaced apart by a distance from the first eccentric part in a direction along the central axis,

the crusher further comprises a counterweight assembly including a counterweight body, the counterweight assembly being configured so as to rotate together with the eccentric assembly and being configured so as to compensate for unbalanced forces generated by a gyratory movement of the head assembly and an offset rotation of the eccentric assembly,

wherein the counterweight body is located between the first eccentric part and the second eccentric part seen in the direction along the central axis.

12. The gyratory or cone crusher of claim 11 , wherein the counterweight assembly is configured and arranged so that the center of gravity thereof is arranged essentially at the same vertical height as the center of gravity of the combination of the eccentric assembly and head assembly, and diametrically opposite thereto.

13. The gyratory or cone crusher of claim 11 wherein the counterweight assembly includes the counterweight body coupled to the first eccentric part and the second eccentric part of the eccentric assembly,

the counterweight assembly being configured so as to rotate together with the eccentric assembly of the gyratory or cone crusher and compensate for unbalanced forces generated by the gyratory movement of the head assembly and the offset rotation of the eccentric assembly of the gyratory or cone crusher.