An example track shoe, cutting edge, or other component of a machine is formed in a heated process, such as hot-rolling followed by air-hardening. The air-hardening process involves cooling the component by flowing air over the component (e.g., air cooling), such that the component is cooled at a controlled rate. During the air-cooling process, such as in the range of about 250° C. to about 1100° C., the component may be machined, such as by shearing, punching, drilling, etc. The machining may form the final shape of the component. As the air-hardening process is completed, and the component approaches room temperature, the component may have at least 5% bainitic crystal composition, and as high as greater than 80% bainitic crystal composition, resulting in relatively high hardness and fracture toughness. The final track shoe may have a hardness between about 40 HRC and 55 HRC.

A heavy-duty vehicle may include a crawler track on which a rest of the vehicle can roll so as to move. A sensor may be configured to detect a physical quantity of the crawler track, of the heavy-duty vehicle, or of the environment contained by or surrounding the crawler track or the heavy-duty vehicle. A power supply unit may be configured to supply the sensor with electric power. The power supply unit comprises a rectenna configured to receive electromagnetic power from an external electromagnetic source and to supply the sensor with at least part of the electromagnetic power.

A heavy-duty vehicle may include a crawler track on which a rest of the vehicle can roll so as to move. A sensor may be configured to detect a physical quantity of the crawler track, of the heavy-duty vehicle, or of the environment contained by or surrounding the crawler track or the heavy-duty vehicle. A power supply unit may be configured to supply the sensor with electric power. The power supply unit comprises a rectenna configured to receive electromagnetic power from an external electromagnetic source and to supply the sensor with at least part of the electromagnetic power.

An articulated chain assembly includes standard links, a master link, and pins pivotably coupling together the standard links and master link. The master link includes a first half link and a second half link, and bolt holes extending through the first half link and the second half link. A first bolt is within a first one of the bolt holes and has a necked-down bolt shank defining a lesser necked-down axial length. A second bolt is within a second one of the bolt holes and includes a necked-down bolt shank defining a greater necked-down axial length. The first bolt and second bolt may have unequal full axial lengths.

An apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo holds, the apparatus including a housing provided with magnetic continuous tracks at opposing lateral sides of the housing, a front wheel and a rear wheel for each of the magnetic continuous tracks, each magnetic continuous track including a plurality of links interconnected by drive pins, the links having an inwardly facing side and an outwardly facing side, a guide configured to engage the drive pins for preventing the links in a first portion of the extent of the of at least one of the magnetic continuous tracks between the front wheel and the rear wheel from moving in the direction in which the outwardly facing side faces and a submersible apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo space in the cargo holds that comprises a watertight housing provided with continuous magnetic tracks at opposing lateral sides of the housing. A watertight housing provided with continuous magnetic tracks at opposing lateral sides of said housing. At least one drive motor in the housing operably connected to at least one continuous magnetic track for driving the continuous magnetic tracks. The housing being provided with a main side between the continuous magnetic tracks.

An apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo holds, the apparatus including a housing provided with magnetic continuous tracks at opposing lateral sides of the housing, a front wheel and a rear wheel for each of the magnetic continuous tracks, each magnetic continuous track including a plurality of links interconnected by drive pins, the links having an inwardly facing side and an outwardly facing side, a guide configured to engage the drive pins for preventing the links in a first portion of the extent of the of at least one of the magnetic continuous tracks between the front wheel and the rear wheel from moving in the direction in which the outwardly facing side faces and a submersible apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo space in the cargo holds that comprises a watertight housing provided with continuous magnetic tracks at opposing lateral sides of the housing. A watertight housing provided with continuous magnetic tracks at opposing lateral sides of said housing. At least one drive motor in the housing operably connected to at least one continuous magnetic track for driving the continuous magnetic tracks. The housing being provided with a main side between the continuous magnetic tracks.

A ground-engaging track system includes a track having a first track chain and a second track chain, and an idler having pockets formed in an outer idler rim to receive inboard rail protrusions on track links in the first track chain and the second track chain. The inboard rail protrusions project from an inboard link side, and a central pad of an upper rail surface in the track link includes an anti-scalloping bump-out formed on the inboard rail protrusion.

A ground-engaging track system includes a track having a first track chain and a second track chain, and an idler having pockets formed in an outer idler rim to receive inboard rail protrusions on track links in the first track chain and the second track chain. The inboard rail protrusions project from an inboard link side, and a central pad of an upper rail surface in the track link includes an anti-scalloping bump-out formed on the inboard rail protrusion.

Track pad includes a first link member that extends upwardly from the shoe member including a first lug member extending from the first link member in a first direction, as well as a second lug member and a third lug member both extending from the first link member in a second direction opposite of the first direction. The track pad also defines a first side cavity that extends from the first lateral end toward the second lateral end, jogging from the front end toward the rear end along the track chain traveling direction, and downwardly toward the ground engaging surface.

Track pad includes a first link member that extends upwardly from the shoe member including a first lug member extending from the first link member in a first direction, as well as a second lug member and a third lug member both extending from the first link member in a second direction opposite of the first direction. The track pad also defines a first side cavity that extends from the first lateral end toward the second lateral end, jogging from the front end toward the rear end along the track chain traveling direction, and downwardly toward the ground engaging surface.