Family of multi-speed transmission mechanisms having three planetary gear sets and six torque-transmitting devices
February 25, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPower transmission for motor driven vehicles Speed change gear system Planetary gearing arrangement for a transmission Planetary transmission Planetary gear train for automatic transmission Planetary gear train for automatic transmission Planetary gear type transmission system Power transmission Multispeed automatic transmission for automobile vehicles Automatic transmission InventorsAssigneeApplicationNo. 10/082461 filed on 02/25/2002US Classes:475/280, Brake for sun, carrier and orbit475/271, Plural elements selectively braked475/293, Speed responsive clutch or brake475/296Plural drive ratios other than unityExaminersPrimary: Lewis, TishaAttorney, Agent or FirmInternational ClassesF16H 3/66 (20060101)F16H 3/44 (20060101) AbstractThe family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets with two brakes, four clutches and three fixed interconnections. The powertrain includes an engine and torque converter that is continuously connected to at least one member of the planetary gear arrangement and an output member that is continuously connected with another of the planetary gear members. The two brakes and four clutches provide interconnections between various gear members and with the transmission housing, the input or output shaft, and the three fixed interconnections, and are operated in combinations of two to establish at least seven forward speed ratios.Field of SearchBrake for sun, carrier and orbitPlural drive ratios other than unity Plural elements selectively braked With brake for sun, carrier and orbit Brake for sun and orbit Brake for sun and carrier Brake for orbit and carrier Speed responsive clutch or brake Including releasable clutch directly between planet pinion and carrier Sun braked Intermeshing planet pinions on single carrier Orbit braked Intermeshing planet pinions on single carrier Carrier braked Intermeshing planet pinions on single carrier | |
