Track link and method for manufacturing track link
A track link includes a tread surface, a shoe surface, a communicating part, and a seat formation part. The tread surface comes into contact with a roller for an undercarriage. The shoe surface is disposed on an opposite side from the tread surface. A track shoe is attachable to the shoe surface. The communicating part is disposed between the shoe and tread surfaces. The communicating part passes through the track link in a width direction that is perpendicular to a linking direction, and allows side faces of the track link to communicate in the width direction. The seat formation part is formed on a shoe surface side of the communicating part. A through-hole passes through from the shoe surface to the seat formation part, and a bolt member is disposable in the through-hole. A number track links in a loop are usable in a track of a work vehicle.
1. 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; and
a seat formation part formed on a shoe surface side of the communicating part;
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 stepped part formed opposite the seat surface from at least one of the walls disposed on sides of the communicating part in the linking direction, toward the through-hole,
corners at ends of the seat formation part in the width direction and a corner on a seat surface side of the stepped part 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.
2. The track link according to claim 1 , wherein
the stepped part restricts a rotation of the nut member.
3. 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.
4. The track link according to claim 3 , wherein
the boss restricts a rotation of the nut member.
5. The track link according to claim 3 , further comprising
a protrusion formed protruding outward from the boss,
the corner near where the boss is formed on the seat formation part being disposed on the protrusion.
6. The track link according to claim 5 , further comprising
a groove trace formed on an inside of the boss so as to correspond to the protrusion.
7. 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.
8. The track link according to claim 7 , wherein
the seat formation part includes a seat surface, and on a nut member that is fastened to the bolt member being disposed on the seat surface, and
the nut member includes a shape such that a contact face of the nut member that contacts with the seat surface matches the curved surface shape.