Fretting wear reduction in interference fit of cone crusher head
A system, cone crusher and its main shaft that includes an interference fit section for supporting a crusher head. The interference fit section has a nominal interference fit diameter D if ; a bottom shaft section extending between a bottom end of the main shaft and the interference fit section, and having a bottom part and a neck part. The bottom part has a bottom part length L bp and a bottom part diameter D bp that is constant below the neck part on at least 50% of the bottom part length L bp . The neck part has a neck part diameter growing towards the interference fit section. The main shaft has a main shaft length L ms . L ms 1.3 /D if is at most 40 mm 1.3 . D bp 1.421 /D if is at most 9.0 mm 0.421 .
1 . A main shaft of a cone crusher, comprising:
an interference fit section for supporting a crusher head, the interference fit section having a nominal interference fit diameter D if ;
a bottom shaft section extending between a bottom end of the main shaft and the interference fit section;
the bottom shaft section comprising a bottom part and a neck part;
wherein the bottom part has a bottom part length L bp and a bottom part diameter D bp that is constant below the neck part on at least 50% of the bottom part length L bp ;
the neck part has a neck part diameter that is growing towards the interference fit section;
the main shaft has a main shaft length L ms ;
wherein for reducing fretting wear in the interference fit section,
L ms 1.3 /D if is at most 40 mm 0.3 ; and
D bp 1.421 /D if is at most 9.0 mm 0.421 .
2 . The main shaft of claim 1 , wherein the main shaft length L ms is at least 1200 mm.
3 . The main shaft of claim 1 , wherein D bp 1.421 /D if is at most 8.0 mm 0.421 .
4 . The main shaft of claim 2 , wherein D bp 1.421 /D if is at most 8.0 mm 0.421 .
5 . The main shaft of claim 1 , wherein D bp 1.421 /D if is at least 6.4 mm 0.421 .
6 . The main shaft of claim 2 , wherein D bp 1.421 /D if is at least 6.4 mm 0.421 .
7 . The main shaft of claim 1 , wherein L ms 1.3 /D if is at least 30 mm 0.3 .
8 . The main shaft of claim 2 , wherein L ms 1.3 /D if is at least 30 mm 0.3 .
9 . The main shaft of claim 1 , wherein the interference fit section is longitudinally continuous.
10 . The main shaft of claim 1 , wherein the main shaft is configured to laterally support the crusher head only by the interference fit section.
11 . The main shaft of claim 1 , wherein at maximum the neck part diameter meets the interference fit section diameter.
12 . The main shaft of claim 1 , wherein the neck part is progressively curving for reducing stress concentration.
13 . A system comprising:
a main shaft comprising:
an interference fit section for supporting a crusher head, the interference fit section having a nominal interference fit diameter D if ;
a bottom shaft section extending between a bottom end of the main shaft and the interference fit section;
the bottom shaft section comprising a bottom part and a neck part;
wherein the bottom part has a bottom part length L bp and a bottom part diameter D bp that is constant below the neck part on at least 50% of the bottom part length L bp ;
the neck part has a neck part diameter that is growing towards the interference fit section;
the main shaft has a main shaft length L ms ;
wherein for reducing fretting wear in the interference fit section,
L ms 1.3 /D if is at most 40 mm 0.3 ; and
D bp 1.421 /D if is at most 9.0 mm 0.421 ; and
a cone crusher head configured for interference fit attaching to the interference fit section of the main shaft.
14 . The system of claim 13 , wherein the cone crusher head has a cone sector of at least 45 degrees.
15 . The system of claim 13 , wherein the cone crusher head has a cone sector of at least 55 degrees.
16 . The system of claim 13 , wherein the cone crusher head is attached to the main shaft.
17 . A cone crusher comprising:
a main shaft, the main shaft comprising:
an interference fit section for supporting a crusher head, the interference fit section having a nominal interference fit diameter D if ;
a bottom shaft section extending between a bottom end of the main shaft and the interference fit section;
the bottom shaft section comprising a bottom part and a neck part;
wherein the bottom part has a bottom part length L bp and a bottom part diameter D bp that is constant below the neck part on at least 50% of the bottom part length L bp ;
the neck part has a neck part diameter that is growing towards the interference fit section;
the main shaft has a main shaft length L ms ;
wherein for reducing fretting wear in the interference fit section,
L ms 1.3 /D if is at most 40 mm 0.3 ; and
D bp 1.421 /D if is at most 9.0 mm 0.421 ; and
a cone crusher head configured for interference fit attaching to the interference fit section of the main shaft.