To provide a pin structure for a construction machine, capable of suppressing the strength degradation of a pin even when adopting a pin greasing type.
The supporting pin 20 has a pin greasing type structure where it can be greased from the side face. It comprises a greasing hole 21a, a branch hole 21b, a surface hardened layer 31, a substrate portion 32, and a plastically deformed portion 33. The greasing hole 21a is formed in a central portion of the supporting pin 20 along the axial direction and communicated with the branch hole 21b formed in the outer peripheral face along the radial direction. The plastically deformed portion 33 is formed on the inner wall face of the branch hole 21b including a boundary P between the surface hardened layer 31 and the substrate portion 32.
COPYRIGHT: (C)2008,JPO&INPIT
Tomoharu Sano
Nishida Masayasu
| JP2004278628A | ||||
| JP3138316A | ||||
| JP2006292025A |