Track link and method for manufacturing track link

A track link, a number of which are linked in a loop shape for use in a track of a work vehicle, the track link comprising:

• a tread surface configured to come into contact with a roller for an undercarriage;
• a shoe surface disposed on an opposite side from the tread surface, and a track shoe being attachable to the shoe surface;
• a communicating part disposed between the shoe surface and the tread surface, the communicating part passing through the track link in a width direction that is perpendicular to a linking direction, and the communicating part being configured to allow side faces of the track link to communicate in the width direction;
• a seat formation part formed on a shoe surface side of the communicating part;
• and
• a through-hole passing through from the shoe surface to the seat formation part, and a bolt member being disposable in the through-hole,
• the seat formation part including
• a seat surface, the through-hole being formed in the seat surface, and a nut member that is linked to the bolt member being disposable on the seat surface, and
• a boss formed on the seat formation part near one of a plurality of corners at ends of the seat formation part in the linking direction, the boss being formed from walls disposed on sides of the communicating part in the linking direction,
• the corners of the ends of the seat formation Part and a corner of the boss being formed in rounded shapes, and
• a grain flow being formed toward a position on the seat formation part and near one of the corners at the ends of the seat formation part in the width direction.

A track link, a number of which are linked in a loop shape for use in a track of a work vehicle, the track link comprising:

• a tread surface configured to come into contact with a roller for an undercarriage;
• a shoe surface disposed on an opposite side from the tread surface, and a track shoe being attachable to the shoe surface;
• a communicating part disposed between the shoe surface and the tread surface, the communicating part passing through the track link in a width direction that is perpendicular to a linking direction, and the communicating part being configured to allow side faces of the track link to communicate in the width direction;
• a seat formation part including a curved surface shape so as to form part of a side face of an imaginary circular column having a center axis along the width direction, and the seat formation part being formed on a shoe surface side of the communicating part;
• and
• a through-hole passing through from the shoe surface to the seat formation part, and a bolt member being disposable in the through-hole,
• corners at ends of the seat formation part in the linking direction being formed in rounded shapes, and
• a grain flow being formed toward a position on the seat formation part and near one of the corners at the ends of the seat formation part in the width direction.

A method for manufacturing a track link, a number of which are linked into a loop shape for use on a work vehicle, the track including a seat formation part including a seat surface with a nut member disposed thereon to be fixed to track shoes, the track formed by forging, the method for manufacturing the track comprising:

• a formation step of producing a track link material in which
• the seat surface is formed at an angle to a forging direction,
• flash is formed on the seat formation part near one of a plurality of corners at ends of the seat formation part in a width direction that is perpendicular to a linking direction of the track link, and
• the corners at the ends are formed in rounded shapes;
• and
• a flash removal step of removing some or all of the flash of the track link material formed by the formation step.