# US 5,707,123 A · Positive drive rubber belted track system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,123 A - Document ID: US5707123A - Status: Granted - Kind: A - Application number: 08/531,813 - Filed: 1995-09-21 - Granted: 1998-01-13 - Earliest claimed: 1995-09-21 - Assignees: Caterpillar Inc. - Inventors: Robert J. Grob - Web page: https://patentgrep.com/patent/US5707123A ## CPC - B62D 55/24: of continuously flexible type, e.g. rubber belts - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) ## Abstract Prestressed compressible drive blocks are positioned on an endless belt of a track machine. The blocks are mateable with openings in drive wheel and function for driving the track and for guiding the track. Drive bars are associated with the drive wheel openings for exerting pressure on the drive/guide bars while maintaining the drive/guide bars against excessive wear. ## Claims ### Claim 1 In a rubber belt track system of a track machine having an endless, cable reinforced rubber belt having a plurality of spaced apart, outwardly extending driver/guide blocks associated with a drive wheel, the improvement comprising: said driver/guide blocks being formed of rubber and compressed to a preselected magnitude in a direction toward the rubber belt in the installed position on the belt; said drive wheel having a plurality of openings mateable with the driver/guide blocks; a drive bar connected to said drive wheel and extending along the wheel axis and along a rearward end of each respective opening of said drive wheel, and being contactable with a respective drive/guide block in the mateable operable condition of the system; at least one fastening element extending through the belt and into each respective driver/guide block and urging the respective driver/guide block toward the belt in the installed condition; said driver/guide blocks each having first and second end portions and a load distributing element being molded within said respective rubber driver/guide blocks, said load distributing element being associated with the respective fastening element of the system. ### Claim 2 (depends on 1) A system, as set forth in claim 1, wherein the load distributing element is elongated and extends in a direction of the largest dimension of an outer end of the respective driver/guide block. ### Claim 3 (depends on 2) A system, as set forth in claim 2, wherein the endless belt has an endless longitudinal axis and the largest dimension of an outer end of each driver/guide block extends along the endless longitudinal axis. ### Claim 4 (depends on 1) A system, as set forth in claim 1, wherein said rubber driver/guide block is compressed a preselected magnitude sufficient to exert a pressure greater than about 20 psi against the belt. ### Claim 5 (depends on 1) A system, as set forth in claim 1, wherein the drive wheel openings have dimensions not larger than about 20 mm greater than the dimensions of the associated driver/guide block portion immediately adjacent the drive wheel opening in the installed operating condition of the system. ### Claim 6 (depends on 1) A system, as set forth in claim 1, wherein said drive wheel has a slot extending outwardly from each wheel opening, each drive bar has first and second flattened end portion each mateable with a slot and each drive bar end portion is positioned within a slot and welded to the drive wheel along the drive wheel slot. ### Claim 7 (depends on 1) A system, as set forth in claim 1, wherein each of said drive bars are of tubular configuration, each having a chamber. ### Claim 8 (depends on 1) A system, as set forth in claim 1, wherein each of said drive bars are solid and free of a chamber. ### Claim 9 (depends on 1) A system, as set forth in claim 1, wherein said driver/guide bars are each positioned generally along an endless longitudinally extending centered axis of the belt. ### Claim 10 (depends on 1) A system, as set forth in claim 1, wherein said drive wheel has first and second spaced apart rows of openings associated with said drive blocks, and said belt has first and second rows of drive/guide blocks mateable with respective rows of openings of said drive wheel. ### Claim 11 (depends on 10) A system, as set forth in claim 10, wherein said drive wheel is a unitary element. ### Claim 12 (depends on 10) A system, as set forth in claim 10, wherein said drive wheel has first and second circumferentially extending wheel portions connected to one another. ### Claim 13 (depends on 1) A system, as set forth in claim 1, including first and second drive bars, each positioned on a respective forward and rearward side of each respective opening of said drive wheel.