Tillage machine and tillage disk for the same

A disk assembly for use with a tillage machine, the disk assembly comprising:

• a disk including
• a body portion rotatable about an axis of rotation, the body portion having a circumferential edge and a concavity with a first radius defined from a point on the axis of rotation,
• a hub portion continuous with the body portion and presenting a first abutment face having a concavity with a second radius defined from a point on the axis of rotation and a second abutment face opposing the first abutment face, and
• an aperture extending through the first and second abutment faces and centered about the axis of rotation;
• a first spool positionable against the first abutment face, the first spool including a bore alignable with the aperture along the axis of rotation;
• and
• a second spool positionable against the second abutment face, the second spool including a bore alignable with the aperture along the axis of the rotation,
• wherein the disk, the first spool, and the second spool are configured to be positioned along a gang bolt that extends along the axis of rotation.

A disk for use with a tillage machine, the disk comprising:

• a body portion rotatable about an axis of rotation, the body portion having an outer edge and a concavity;
• a hub portion continuous with the body portion and presenting a curvilinear abutment face;
• and
• an aperture extending through the abutment face and centered about the axis of rotation.

A tillage disk assembly kit comprising:

• a first disk including
• a body portion rotatable about an axis of rotation, the body portion having a circumferential edge and a concavity with a first radius defined from a point on the axis of rotation, and
• a hub portion continuous with the body portion and presenting a first abutment face having a concavity with a second radius defined from a point on the axis of rotation and a second abutment face opposing the first abutment face,
• a second disk including
• a body portion rotatable about an axis of rotation, the body portion having a circumferential edge and a concavity with a third radius defined from a point on the axis of rotation, the third radius different than the first radius, and
• a hub portion continuous with the body portion and presenting a third abutment face having a concavity with the second radius and a fourth abutment face opposing the third abutment face,
• a first spool positionable against the first abutment face and positionable against the third abutment face;
• and
• a second spool positionable against the second abutment face and positionable against the fourth abutment face,
• wherein the first disk, the first spool, and the second spool are configured to be positioned along a gang bolt that extends along the axis of rotation for tillage operation, and
• wherein the second disk, the first spool, and the second spool are configured to be positioned along the gang bolt for tillage operation.