Piston pin with eccentric center of gravity using different materials and method for manufacturing the same
AssigneeHyundai Motor Company
InventorHak-Soo Kim
Life of this patent
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Abstract
A piston pin has an eccentric center of gravity and formed of different materials and is installed through a piston and an upper end of a connecting rod. The piston pin includes a cylindrical outer member and a cylindrical inner member formed of a material which has a lower density than the outer member and is arranged in the outer member.
Claims17
A piston pin having different materials and installed through a piston and an upper end of a connecting rod, the piston rod comprising:
- a cylindrical outer member;
- and
- a cylindrical inner member including a material having lower density than the outer member, the cylindrical inner member arranged in the outer member,
- wherein the cylindrical inner member is forced into the outer member, and
- the cylindrical inner member is inclined to have a concave end portion.
A piston pin having different materials and installed through a piston and an upper end of a connecting rod, the piston pin comprising:
- a cylindrical outer member;
- and
- a cylindrical inner member located in the outer member, in which a center of the cylindrical inner member is arranged at a position which is eccentric with respect to a center of the outer member.
A method for manufacturing a piston pin having different materials, the piston pin installed through a piston and an upper end of a connecting rod, the method comprising:
- placing a cylindrical outer member in a die in which a punching device is installed to be lifted or lowered;
- forcing a cylindrical inner member into the outer member, such that the inner member is arranged in the outer member, the inner member having a different material from the outer member;
- and
- pressurizing both ends of the outer member and the inner member such that the inner member does not come off the outer member,
- wherein the outer member has a constant outer diameter at a portion adjacent to an end of the outer member which has a thickness that decreases toward the end thereof, and
- wherein the pressurizing of both ends of the outer member and the inner member comprises pressurizing the end of the inner member with respect to the outer member such that the end of the inner member is concavely deformed.
Dependencies are inferred from the claim text.