Seal assembly for track pin joint assembly of undercarriage

A track pin cartridge assembly comprising:

• a track pin defining a longitudinal axis;
• a first member and a second member both coaxial with the track pin about the longitudinal axis, the first member being pivotable about the longitudinal axis with respect to the second member, the first member including a load ring engagement surface defining, at least in part, a seal cavity disposed in proximal relationship to the second member;
• and
• a seal assembly, the seal assembly disposed in the seal cavity and sealingly engaging the first member and the second member, the seal assembly comprising:
• a seal ring, the seal ring having an axial flange, extending along the longitudinal axis, and a radial flange, extending along a radial axis perpendicular to the longitudinal axis;
• and
• a load ring, the load ring including a seal ring engagement surface, a first member engagement surface, an inner relief surface, and an outer relief surface, the seal ring engagement surface including a radial segment in proximate relationship with the radial flange of the seal ring and an axial segment in proximate relationship with the axial flange of the seal ring, the first member engagement surface engaging the load ring engagement surface of the first member, the first member engagement surface including a radial segment and an axial segment, the radial segment of the first member engagement surface being in distal relationship with the radial segment of the seal ring engagement surface, the inner relief surface extending between the radial segment of the first member engagement surface and the axial segment of the seal ring engagement surface and having an inclined segment, and the outer relief surface extending between the axial segment of the first member engagement surface and the radial segment of the seal ring engagement surface and having an inclined segment;
• wherein, when the load ring is in an uncompressed condition, the inclined segment of the inner relief surface is disposed at an oblique angle with resect to the longitudinal axis, the inclined segment of the outer relief surface is disposed at an oblique angle with respect to the longitudinal axis, and the radial segment of the first member engagement surface is radially offset, measured along the radial axis, from the radial segment of the seal ring engagement surface.

An undercarriage assembly comprising:

• a track pin defining a longitudinal axis;
• a first link assembly and a second link assembly mounted to the track pin such that the first link assembly and the second link assembly are rotatable with respect to each other about the longitudinal axis of the track pin, at least one of the first link assembly and the second link assembly comprising a first member having a load ring engagement surface defining, at least in part, a seal cavity disposed between the first link assembly and the second link assembly;
• and
• a seal assembly, the seal assembly disposed in the seal cavity and sealingly engaging the first link assembly and the second link assembly, the seal assembly comprising:
• a seal ring, the seal ring having an axial flange, extending along the longitudinal axis, and a radial flange, extending along a radial axis perpendicular to the longitudinal axis;
• and
• a load ring, the load ring including a seal ring engagement surface, a first member engagement surface, an inner relief surface, and an outer relief surface, the seal ring engagement surface including a radial segment in proximate relationship with the radial flange of the seal ring and an axial segment in proximate relationship with the axial flange of the seal ring, the first member engagement surface engaging the load ring engagement surface of the first member, the first member engagement surface including a radial segment and an axial segment, the radial segment of the first member engagement surface being in distal relationship with the radial segment of the seal ring engagement surface, the inner relief surface extending between the radial segment of the first member engagement surface and the axial segment of the seal ring engagement surface and having an inclined segment, and the outer relief surface extending between the axial segment of the first member engagement surface and the radial segment of the seal ring engagement surface and having an inclined segment;
• wherein when the load ring is in an uncompressed condition, the inclined segment of the inner relief surface is disposed at an oblique angle with respect to the longitudinal axis, the inclined segment of the outer relief surface is disposed at an oblique angle with respect to the longitudinal axis, and the radial segment of the first member engagement surface is radially offset, measured along the radial axis, from the radial segment of the seal ring engagement surface.