Track joint assemblies

A track joint unit (155) comprising: a first link (110a, 110b) having a first hole (170a, 170b); a second link (110a, 110b) having a second hole (160a, 160b); a pin (120) located at least partially within the first hole (170a, 170b); an inner bushing (157) located coaxially around the pin (120), and at least partially within the second hole (160a, 160b); an outer hub (250) positioned coaxially around the inner hub (157); and a sealing unit (240a, 240b) positioned between the first link (110a, 110b) and the second link (110a, 110b) to form an airtight seal between the first link (110a, 110b) and the second link (110a, 110b); characterized by a thrust ring (290a, 290b) located coaxially around the inner bushing (157), arranged in the second hole (160a, 160b), and supporting a sealing unit (310a, 310b) located between the second link ( 110a, 110b) and the outer bushing (250) to form a tight seal between the second link (110a, 110b) and the outer bushing (250).