# US 5,342,256 A · Differential gear system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,342,256 A - Document ID: US5342256A - Status: Granted - Kind: A - Application number: 07/991,109 - Filed: 1992-12-16 - Granted: 1994-08-30 - Earliest claimed: 1990-04-25 - Assignees: Viscodrive GmbH - Inventors: Peter Amborn; Wolfgang Hildebrandt - Web page: https://patentgrep.com/patent/US5342256A ## CPC - F16H 48/285: with self-braking intermeshing gears having parallel axes and having worms or helical teeth - F16H: GEARING ## Abstract A differential gear system for use in the driveline of a motor vehicle, having a differential carrier (1) rotating in bearings of a differential housing (1) and driven via a driving gear tooth configuration; two axle shaft gears (10, 11) rotating in bearings of the differential carrier, which are coaxial relative to each other; and compensating gears (12, 13) eccentrically supported in, and rotating with, the differential carrier, where each of the compensating gears is in one part meshed with the one axle shaft gear (10) and in another part, with the other axle shaft gear (11), while engaging each other at least indirectly, and where the axle shaft gears (10, 11) have a tooth design which, when under torque, generates an axial thrust, and where friction-reducing means are provided at all face areas of at least the axle shaft gears (10, 11) that are subjected to loads during coasting of the motor vehicle, opposite the mating surfaces of the differential carrier (1) or the respective other axle shaft gear. ## Claims ### Claim 1 A differential gear system for use in the driveline of a motor vehicle, comprising a differential carrier that rotates in bearings of a differential housing and is driven via a drive gear tooth configuration; two axle shaft gears rotate in the differential carrier and are coaxial relative to each other; and at least two compensating gears are eccentrically supported in, and rotating with, the differential carrier, one of the compensating gears is meshed with one of said axle shaft gears, and the other compensating gear of the compensating gears is meshed with the other axle shaft gear, while engaging each other at least indirectly, and where the axle shaft gears have a tooth design which, when under torque, generates an axial thrust, said axle shaft gears being supported inside a clear passage of the differential carrier; surfaces of the axle shaft gears which are subjected to loads with transmission of torque from the wheels to the driveline are arranged towards the center of the differential cage; and the axle shaft gears surfaces and/or surfaces in contact with said axle shaft gears which are subjected to loads with transmission of torque from the wheels to the driveline are provided with free floating first friction-reducing means positioned between said axle shaft gears and said surfaces in contact with said axle shaft gears, while the axle shaft gears are mutually supportive, either directly, or by means of intermediate elements. ### Claim 2 (depends on 1) A differential gear system according to claim 1, wherein the surfaces of the compensating gears and/or surface in contact with the differential cage which are subjected to loads with transmission of torque from the wheels to the driveline are provided with free floating second friction-reducing means. ### Claim 3 (depends on 2) A differential gear system according to claim 2, wherein the second friction-reducing means is provided on face areas of the compensating gears. ### Claim 4 (depends on 3) A differential gear system according to claim 3, wherein the second friction-reducing means is in the form of thrust bearings. ### Claim 5 (depends on 2) A differential gear system according to claim 2, wherein the second friction-reducing means is in the form of thrust bearings. ### Claim 6 (depends on 1) A differential gear system according to claim 1, wherein the first friction-reducing means is provided on face areas of the axle shaft gears. ### Claim 7 (depends on 6) A differential gear system according to claim 6, wherein the first floating friction-reducing means is in the form of thrust bearings. ### Claim 8 (depends on 1) A differential gear system according to claim 1, wherein the first friction-reducing means is provided in the form of thrust bearings. ### Claim 9 A differential gear system for use in the driveline of a motor vehicle, comprising a differential carrier that rotates in bearings of a differential housing and is driven via a drive gear tooth configuration; two axle shaft gears rotate in the differential carrier and are coaxial relative to each other; and at least two compensating gears are eccentrically supported in, and rotating with, the differential carrier, one of the compensating gears is meshed with one of said axle shaft gears, and the other compensating gear of the compensating gears is meshed with the other axle shaft gear, while engaging each other at least indirectly, and where the axle shaft gears have a tooth design which, when under torque, generates an axial thrust, said axle shaft gears being supported inside a clear passage of the differential carrier; surfaces of the axle shaft gears which are subjected to loads with transmission of torque from the wheels to the driveline are arranged towards the center of the differential cage; and the axle shaft gears surfaces and/or surfaces in contact with said axle shaft gears which are subjected to loads with transmission of torque from the wheels to the driveline are provided with first thrust bearings positioned between said axle shaft gears and said surfaces in contact with said axle shaft gears, while the axle shaft gears are mutually supportive, either directly, or by means of intermediate elements. ### Claim 10 (depends on 9) A differential gear system according to claim 9, wherein the surfaces of the compensating gears and/or surfaces in contact with the differential cage which are subjected to loads with transmission of torque from the wheels to the driveline are provided with second thrust bearings positioned between said compensating gears and said surfaces in contact with said compensating gears. ### Claim 11 (depends on 10) A differential gear system according to claim 10, wherein the second thrust bearings are provided on face areas of the compensating gears. ### Claim 12 (depends on 9) A differential gear system according to claim 9, wherein the first thrust bearings are provided on face areas of the axle shaft gears.