# US 12,760,784 B2 · Traction mechanism with internal toothing and external toothing, and transmission with traction mechanism > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,760,784 B2 - Document ID: US12760784B2 - Status: Granted - Kind: B2 - Application number: 18/898,210 - Filed: 2024-09-26 - Published: 2025-02-06 - Granted: 2026-10-13 - Earliest claimed: 2018-05-31 - Assignees: TQ-Systems GmbH - Applicants: TQ-Systems GmbH - Inventors: Antonius Georg Rossberger - Web page: https://patentgrep.com/patent/US12760784B2 ## CPC - F16G 1/28: with a contact surface of special shape, e.g. toothed - F16H 49/001: {Wave gearings, e.g. harmonic drive transmissions} - B62M 9/00: Transmissions characterised by use of an endless chain, belt, or the like (cycle chain guards B62J13/00) - F16H 2049/003: {Features of the flexsplines therefor} - F16G: BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR - F16H: GEARING - B62M: RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR {SINGLE-TRACK} CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES (arrangements or mounting of transmissions in vehicles in general B60K; transmission elements per se F16) ## Abstract A toothed belt includes an internal toothing and an external toothing; wherein tooth crests of the internal toothing comprise a rounded region and wherein tooth crests of the external toothing comprise a rounded region, wherein the tooth crests of the internal toothing are arranged radially opposite the tooth bases of the external toothing so that the toothed belt comprises an offset gap arrangement in which the teeth of the internal toothing and the external toothing are offset from each other, and wherein the toothed belt comprises a smooth central bearing region. ## Claims ### Claim 1 A transmission comprising: an input shaft; an output shaft; an outer gear; an inner gear arranged concentrically to the outer gear and inside the outer gear, a traction mechanism extending between the outer gear and the inner gear, and at least one revolving transmitter which lifts the traction mechanism from the outer circumference of the inner gear and presses it against the inner circumference of the outer gear, wherein the traction mechanism is a toothed belt comprising: an internal toothing; and an external toothing; wherein tooth crests of the internal toothing comprise a rounded region and wherein tooth crests of the external toothing comprise a rounded region, wherein the tooth crests of the internal toothing are arranged radially opposite the tooth bases of the external toothing so that the toothed belt comprises an offset gap arrangement in which the teeth of the internal toothing and the external toothing are offset from each other, and wherein the toothed belt comprises a smooth central bearing region. ### Claim 2 (depends on 1) The transmission according to claim 1, wherein an inner side of the toothed belt comprises a central bearing region which is provided in the form of a vertical circular cylinder, such that the internal toothing adjoins the central bearing region in axially opposite regions. ### Claim 3 (depends on 1) The transmission according to claim 1, wherein the toothed belt is made in one piece. ### Claim 4 (depends on 1) The transmission according to claim 1, wherein the toothed belt comprises plastic. ### Claim 5 (depends on 1) The transmission according to claim 1, wherein the toothed belt comprises a steel alloy. ### Claim 6 (depends on 1) The transmission according to claim 1, wherein the input shaft is connected to the transmitter. ### Claim 7 (depends on 1) The transmission according to claim 1, wherein the input shaft is connected to the outer gear. ### Claim 8 (depends on 1) The transmission according to claim 1, wherein the input shaft is connected to the inner gear. ### Claim 9 (depends on 1) The transmission according to claim 1, wherein the output shaft is connected to the inner gear. ### Claim 10 (depends on 1) The transmission according to claim 1, wherein the output shaft is connected to the transmitter. ### Claim 11 (depends on 1) The transmission according to claim 1, wherein the output shaft is connected to the outer gear. ### Claim 12 (depends on 1) A motor-transmission unit with a transmission according to claim 1, further comprising an electric motor, a rotor of the electric motor connected to the input shaft of the transmission. ### Claim 13 (depends on 1) A motor-transmission unit with a transmission according to claim 1, further comprising an internal combustion engine, an output shaft of the internal combustion engine connected to the input shaft of the transmission. ### Claim 14 (depends on 12) A vehicle comprising: a motor-transmission unit according to claim 12, wherein at least one running wheel of the vehicle is connected to the output shaft of the transmission, and wherein the vehicle is a two-wheeler or a three-wheeler. ### Claim 15 (depends on 1) A power generator comprising: a drive unit; a generator unit for generating power; and a transmission according to claim 1, wherein: an input shaft of the transmission is connected to the drive unit; and an output shaft of the transmission is connected to an input shaft of the generator.