PROBLEM: To provide a cover body (18) at a space X formed between a motor housing (14) and a sprocket (15) which are the components of a drive sprocket (10) of a base carrier (2) in a hydraulic shovel, so as to prevent foreign substances such as sand from entering into the space, and to be installed to the motor housing side (14) without forming a bolt hole. SOLUTION: A cover body (18) is formed to be a split-body divided to an upper half (19) and a lower half (20), and to be connected to each other to form a ring shape by connecting a connect bolt (23) formed at an adjacent part of the cover body (18). The cover body (18) is installed to the space X by inserting an adjust bolt (21) into a ring shaped main body part (19a and 20a) till abut the motor housing (14) tightly. An outlet (26) is formed as a notch on a cover body (19d and 20d) to discharge the foreign substances entering into the space X between the sprocket housing (15) and a tip end of the cover part.

A track link comprises a body defining a top surface, a bottom surface, a first side surface and a second side surface, a proximate end and a distal end, a first bore adjacent the distal end defining a first longitudinal axis and a second bore adjacent the proximate end defining a second longitudinal axis; wherein either the first bore or the second bore is a blind bore, forming a counterbore configured to house a seal assembly and the counterbore defines a wall that forms an angle with the longitudinal axis of the bore that is greater than zero degrees.

A track unit may include one or more bogies arranged between front and rear guide wheels. The bogies are provided with wheel pairs that are rotatably arranged about a longitudinal axis of the bogie itself, and capable of adapting individually to transversal oscillations caused by the terrain. The bogies can furthermore be equipped to adapt to longitudinal oscillations as well, by the longitudinal portion of the bogie being rotatable about a transversal axis. The track unit may also be equipped with a cutter, non-rotatably mounted on one or both outer faces of the rear guide wheel, in a position where said wheel is in direct contact with the track, the cutter configured to cut crop material transported upwards between the rear guide wheel and the track when the track unit moves forward.

A track unit may include one or more bogies arranged between front and rear guide wheels. The bogies are provided with wheel pairs that are rotatably arranged about a longitudinal axis of the bogie itself, and capable of adapting individually to transversal oscillations caused by the terrain. The bogies can furthermore be equipped to adapt to longitudinal oscillations as well, by the longitudinal portion of the bogie being rotatable about a transversal axis. The track unit may also be equipped with a cutter, non-rotatably mounted on one or both outer faces of the rear guide wheel, in a position where said wheel is in direct contact with the track, the cutter configured to cut crop material transported upwards between the rear guide wheel and the track when the track unit moves forward.

A bushingless track pin is disclosed. The track pin includes a hardened outer layer and a relatively softer inner core. The track pin may be formed using high carbon steel, which in some cases may be substantially spheroidal martensite crystal structure. A track pin may be formed using the high carbon steel, followed by a hardening process. In some examples, an optional induction hardening process may thereafter be performed on the inner surface most proximal to the central hole of the track pin if needed. The hardening on the inner surface may harden the outer portion while tempering the core portion of the track pin.

A bushingless track pin is disclosed. The track pin includes a hardened outer layer and a relatively softer inner core. The track pin may be formed using high carbon steel, which in some cases may be substantially spheroidal martensite crystal structure. A track pin may be formed using the high carbon steel, followed by a hardening process. In some examples, an optional induction hardening process may thereafter be performed on the inner surface most proximal to the central hole of the track pin if needed. The hardening on the inner surface may harden the outer portion while tempering the core portion of the track pin.

The present application provides a supporting wheel shaft, a supporting wheel and a work machine. The supporting wheel shaft including an oil inlet, a first oil outlet, a second oil outlet and a lubricating oil passage; the oil inlet is provided near a middle portion of the supporting wheel shaft and used to communicate with a first oil storage chamber on a wheel body of a supporting wheel; the first oil outlet is provided close to a first end of the supporting wheel shaft and used to extend to a first floating oil seal on the supporting wheel; the second oil outlet is provided close to a second end of the supporting wheel shaft and used to extend to a second floating oil seal on the supporting wheel; the lubricating oil passage is provided inside the supporting wheel shaft and extends from the first end of the supporting wheel shaft to the second end thereof. The lubricating oil passage communicates with the oil inlet, the first oil outlet and the second oil outlet, respectively. The present application improves the lubricating environment of the floating oil seal of the supporting wheel, prevents the excessive wear of the floating oil seal and the bushing of the supporting wheel due to a decrease of the amount of lubricating oil, and ensures the service life of the supporting wheel.

The present application provides a supporting wheel shaft, a supporting wheel and a work machine. The supporting wheel shaft including an oil inlet, a first oil outlet, a second oil outlet and a lubricating oil passage; the oil inlet is provided near a middle portion of the supporting wheel shaft and used to communicate with a first oil storage chamber on a wheel body of a supporting wheel; the first oil outlet is provided close to a first end of the supporting wheel shaft and used to extend to a first floating oil seal on the supporting wheel; the second oil outlet is provided close to a second end of the supporting wheel shaft and used to extend to a second floating oil seal on the supporting wheel; the lubricating oil passage is provided inside the supporting wheel shaft and extends from the first end of the supporting wheel shaft to the second end thereof. The lubricating oil passage communicates with the oil inlet, the first oil outlet and the second oil outlet, respectively. The present application improves the lubricating environment of the floating oil seal of the supporting wheel, prevents the excessive wear of the floating oil seal and the bushing of the supporting wheel due to a decrease of the amount of lubricating oil, and ensures the service life of the supporting wheel.

The track system has four track assemblies each mounted to a corresponding driving axle of a vehicle to receive driving power therefrom, each track assembly having: a plurality of transversally-oriented track roller shafts mounted to a frame structure, parallel to one another and interspaced from one another from including two end roller shafts each at a corresponding opposite longitudinal end; an endless track belt having an outer surface and an inner surface, the endless track belt being longitudinally oriented and wrapping the track roller shafts; an anti-diving flap having a flat body protruding upwardly and longitudinally from one longitudinal end of the endless track belt, the anti-diving flap having two structural arms, each structural arm extending around the endless track belt on a respective transversal side thereof and being secured to the frame structure.

The track system has four track assemblies each mounted to a corresponding driving axle of a vehicle to receive driving power therefrom, each track assembly having: a plurality of transversally-oriented track roller shafts mounted to a frame structure, parallel to one another and interspaced from one another from including two end roller shafts each at a corresponding opposite longitudinal end; an endless track belt having an outer surface and an inner surface, the endless track belt being longitudinally oriented and wrapping the track roller shafts; an anti-diving flap having a flat body protruding upwardly and longitudinally from one longitudinal end of the endless track belt, the anti-diving flap having two structural arms, each structural arm extending around the endless track belt on a respective transversal side thereof and being secured to the frame structure.