Crosshead for a piston rod
A crosshead for a piston rod is provided, which comprises a main body having a first and a second seat. The first seat is configured to hold a connecting rod, and the second seat is configured to hold a piston rod. The main body is made as a single piece.
1. A crosshead for a piston rod, comprising:
a main body, made as a single piece, said main body comprising:
a first and a second seat, said first seat configured to hold a connecting rod and said second seat configured to hold a piston rod;
a front portion and a back portion, the back portion comprising two branches connected to the front portion, each branch having a thickness of between 22 to 25% of the total width of the crosshead and defining a respective hole for a pin,
wherein said first seat is located on the back portion and said second is located on the front portion.
2. The crosshead according to claim 1 , wherein said second seat is a bore through said main body, said bore having a central axis defining a longitudinal axis of said main body.
3. The crosshead according to claim 2 , wherein said main body has a front surface, said bore having an opening on said front surface.
4. The crosshead according to claim 3 , wherein said front surface is smooth.
5. The crosshead according to claim 2 , wherein said bore has an internal surface configured to contact said piston rod.
6. The crosshead according to claim 1 , wherein said first seat comprises two holes for a pin, the main body being provided with at least one receptacle for each hole to allow locking of said pin into the respective hole.
7. The crosshead according to claim 6 , wherein said at least one receptacle is located on a front surface of the main body or on a back surface of the main body.
8. The crosshead according to claim 1 , wherein said branches are not connected directly.
9. The crosshead according to claim 8 , further comprising two shoes, each shoe being connected to both branches.
10. The crosshead according to claim 8 , further comprising four shoes, each shoe being connected to one of said branches.
11. The crosshead according to claim 1 , further comprising two shoes, each shoe being connected to both branches.
12. The crosshead according to claim 1 , further comprising four shoes, each shoe being connected to one of said branches.
13. A crosshead for a piston rod, comprising:
a main body, made as a single piece, said main body comprising:
a first and a second seat, said first seat configured to hold a connecting rod and said second seat configured to hold a piston rod;
a front portion and a back portion, the back portion comprising two branches connected to the front portion, each branch defining a respective hole for a pin,
wherein said first seat is located on the back portion and said second is located on the front portion; and
two shoes, each shoe connected to both branches.
14. The crosshead according to claim 13 , wherein said branches are not connected directly.
15. The crosshead according to claim 13 , wherein said second seat is a bore through said main body, said bore having a central axis defining a longitudinal axis of said main body.
16. The crosshead according to claim 15 , wherein said bore has an internal surface configured to contact said piston rod.
17. The crosshead according to claim 15 , wherein said main body has a front surface, said bore having an opening on said front surface.
18. The crosshead according to claim 17 , wherein said front surface is smooth.
19. The crosshead according to claim 13 , wherein said first seat comprises two holes for a pin, the main body being provided with at least one receptacle for each hole to allow locking of said pin into the respective hole.
20. The crosshead according to claim 19 , wherein said at least one receptacle is located on a front surface or on a back surface of the main body.