Pin Bushing and Method of Manufacturing the Same

A pin bushing, wherein the pin bushing comprises a through-hole running through the pin bushing in an axial direction of the pin bushing, a first axial section, a second axial section and an intermediate section disposed around the through-hole, the first axial section and the second axial section are located at both ends of the pin bushing in the axial direction, the intermediate section is disposed between the first axial section and the second axial section, the intermediate section has an intermediate radially outer portion and an intermediate radially inner portion in a radial direction of the pin bushing, the intermediate radially inner portion has a radially inward surface, the radially inward surface encloses a portion of the through-hole, wherein hardness values of the first axial section, the second axial section and the intermediate radially outer portion are greater than that of the intermediate radially inner portion.