Abstract: A unitized seal assembly is provided for installation between linkages of a chain drive designed for tracked vehicles. The seal assembly facilitates field preventative maintenance on the drive chain by utilizing an integral spacer that holds the critical sealing surfaces together at all times, and has a seal head that can be easily removed from the outer link bore of a chain link. Removal of the seal head from the outer link bore causes as-installed clearance passageways between the seal head and seat portions and the spacer to forcefully close and prevent abrasive particles from getting inside the seal and reaching the interior interface junction of the dynamic sealing surfaces during seal maintenance. The seal assembly also includes additional sealing features that provide improved performance.

Abstract: A machine includes a bolt together track having sets of straight track links positioned in parallel and coupled via at least one pin. Retainer assemblies for the first and second sets of track links include at least one keeper engageable with the at least one pin and a keeper retainer configured to rotationally interlock with the track segment via threads, to inhibit disassembly of the keepers from the at least one pin. An assembly method for a machine track segment includes positioning first and second sets of track links on at least one pin, installing keepers on the at least one pin and inhibiting disassembly of the links by interlocking keeper retainers with the machine track segment, for instance rotationally interlocking the keeper retainers via external threads with threaded bores in the track links.

Abstract: In a track with a rotatable bushing which is brought into engagement with a sprocket of a track-type vehicle, it is intended that strength is enhanced rationally by link functionality sharing and by combination of such assigned functional tasks for achieving further improvements in rotatable bushing function. To this end, a first bolt insertion hole provided in a track shoe mount surface of an external link and a second bolt insertion hole provided in a track shoe mount surface of an internal link are arranged on the same straight line, and a straight line connecting the first bolt insertion hole and the second bolt insertion hole is situated at a position more interior than a contact plane of the external link and internal link.

Abstract: A seal assembly has simple assembly structures, and provides secure sealing effects. A crawler-track connection structure allows the seal assembly to be easily mounted, and securely prevents overflow of a lubricant and the like to the outside. A pair of seal rings (1) and (1) individually having lip portions (23) and (23) are disposed such that each of the lip portions (23) and (23) protrudes in a direction opposing an axial direction, and a load seal ring (2) is compressed and inserted between the pair of seal rings (1) and (1). The load seal ring (2) exerts reaction forces on the pair of lip portions (23) and (23) outwardly in the axial direction.

Abstract: A seal for an endless track has a cross section having a centerline parallel to an axis of the seal and a configuration symmetric with respect to the centerline of the cross section. The seal can include an elastically deformably configured portion having a cross section like alphabetical letter X, and a protrusion extending from an intersection of legs of letter X in a bushing-side direction further than a plane connecting bushing-side end portions of the legs of letter X. The protrusion has an end surface where the protrusion contacts the bushing. The seal can further include an embedding portion embedded in a space between legs of letter X, on a bushing-side of the intersection of the legs of letter X.

Abstract: A cartridge assembly for a track chain assembly includes a bushing having a passageway defined therethrough. The cartridge assembly also includes track pin having a longitudinal axis. The track pin is located within the passageway so that a first end portion and a second end portion of the track pin extends outwardly from the passageway of the bushing. The cartridge assembly further includes a first insert having a first bore defined therethrough. The first insert is positioned relative to the track pin such that the first end portion of the track pin is disposed within the first bore. The cartridge assembly also includes a first collar having a first hole defined therein.

Abstract: A track bushing for an endless track of a track-type vehicle includes a cylindrical tubular shape, a first end and a second end, and first end and second bearing surfaces adjacent respective ends. A circumferential groove having a depth in an axial direction is formed in at least one of the first end and second end bearing surfaces. An abrasion resistant material is deposited within the circumferential groove and bonded to the bushing at a bond interface. The abrasion resistant material at the bond interface is diluted with no greater than 5% by weight track bushing material.

Abstract: A track bushing for an endless track of a track-type machine includes a cylindrical tubular shape having a first end and a second end and a longitudinal axis. The track bushing further includes a first end bearing surface that is adjacent to the first end and a second end bearing surface that is adjacent to the second end. A circumferential groove is formed in at least one of the first end bearing surface and the second end bearing surface. The circumferential groove has a depth along the longitudinal axis. An abrasion and corrosion resistant material is arc welded within the circumferential groove to the bushing at a weld joint.

Abstract: An end face seal for sealing between first and second articulately coupled members of a track joint is disclosed. The seal is provided with a flexible dirt shield of elastomeric material. The dirt shield extends radially outwardly from the seal ring and has a distal end that is adapted to sealingly engage the first member at a location externally of the load ring to prevent the ingress of abrasive materials between the seal ring and the load ring and eliminate the abrasive erosion of the load ring, thereby maintaining the axial seal bearing force of the load ring against the seal ring throughout the useful life of the seal.

Abstract: A track bushing for use with a track assembly of a track-type machine includes a generally cylindrical member having ends adapted for mounting in opposing end portions of a track link and a longitudinal bore extending between the ends. The inner surface of the bore defines first and second load bearing portions at each of the ends. Each of the first load bearing portions define a first conical surface tapering radially inward from each of the ends at a first angle, and each of the second load bearing portions define a second conical surface tapering radially inward from each of the first conical surfaces at a second angle. In the bushing's assembled state, the first angle is in the range of 0.09 degrees to 0.18 degrees and the second angle is in the range of -0.01 degrees to 0.01. In the bushing's free state, the first angle is in the range of 0.19 degrees to 0.27 degrees and the second angle is in the range of 0.06 degrees to 0.08 degrees.

Abstract: An ignition control apparatus for an internal combustion engine in which the engine can not be started without the operation of a switch unit, thus preventing the theft of a motorcycle on which an ignition control apparatus of the invention is installed. A switch unit includes a key switch connected to a power source and a control element in the form of a resistor or a transistor. An ignition control unit is connected to the switch unit for supplying a key signal to the control element when the key switch is turned on, so that based on the key signal the control element energizes the ignition control unit for performing ignition control on the engine.