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US 9,279,489 B2Granted
Vehicle transmission
AssigneeJCB Transmissions
InventorsDavid John Hoyle, Simon James Peter Evans
Life of this patent
Estimating the term…
Abstract
A vehicle transmission comprising a multi-ratio gearbox having a gearbox input shaft and a gearbox output shaft, the gearbox being operable to provide a driving connection between the gearbox input shaft and the gearbox output shaft at a selected one of a plurality of gear ratios, a torque converter having a torque converter input for connection to an engine, and a torque converter output driveably connected to the torque converter input by fluid coupling within the torque converter, a first driving connection between the torque converter output and the gearbox input shaft, a second driving connection between the torque converter input and the gearbox input shaft, and a selection means to select one of the first driving connection and the second driving connection.
Claims21
A vehicle transmission, comprising;
- a multi-ratio gearbox having a gearbox input shaft and a gearbox output shaft, the gearbox being operable to provide a driving connection between the gearbox input shaft and the gearbox output shaft at a selected one of a plurality of gear ratios,
- a torque converter having a casing with a first torque converter output, a torque converter input for connection to an engine, and a second torque converter output,
- a selectable first driving connection between the second torque converter output and the gearbox input shaft, wherein the second torque converter output is driveably connected to the torque converter input by fluid coupling within the torque converter,
- a selectable second driving connection between the torque converter input and the gearbox input shaft, wherein the second torque converter output is mechanically constrained to rotate at the same rate as the first torque converter output so that the torque converter rotates as a unit when the second driving connection is selected, the second driving connection being defined between the torque converter and the gearbox and;
- a lock up clutch able to select one of the first driving connection and the second driving connection, wherein the lock up clutch is positioned outside of the torque converter and is selectively engageable with the second driving connection so as to constrain the second torque converter output to rotate at the same rate as the first torque converter output.
2 more elements
A vehicle transmission, comprising;
- a multi-ratio gearbox having a gearbox input shaft and a gearbox output shaft, the gearbox being operable to provide a driving connection between the gearbox input shaft and the gearbox output shaft at a selected one of a plurality of gear ratios;
- a torque converter having a casing with a first torque converter output, a torque converter input for connection to an engine, and a second torque converter output;
- a selectable first driving connection between the second torque converter output and the gearbox input shaft, wherein the second torque converter output is driveably connected to the torque converter input by fluid coupling within the torque converter;
- a selectable second driving connection between the torque converter input and the gearbox input shaft, wherein the second torque converter output is mechanically constrained to rotate at the same rate as the torque first converter output so that the torque converter rotates as a unit when the second driving connection is selected, the second driving connection being defined between the torque converter and the gearbox;
- wherein the second driving connection further comprises a first gear carried on a shaft connected to the casing of the torque converter, said shaft comprising a sleeve shaft disposed coaxially with the second torque converter output;
- and
- a lock up clutch able to select one of the first driving connection and the second driving connection, wherein the lock up clutch is selectively engageable with the second driving connection so as to constrain the second torque converter output to rotate at the same rate as the first torque converter output.
4 more elements
A vehicle transmission, comprising;
- a multi-ratio gearbox having a gearbox input shaft and a gearbox output shaft, the gearbox being operable to provide a driving connection between the gearbox input shaft and the gearbox output shaft at a selected one of a plurality of gear ratios;
- a torque converter having a casing with a first torque converter output, a torque converter input for connection to an engine, and a torque converter output;
- a selectable first driving connection between the second torque converter output and the gearbox input shaft, wherein the second torque converter output is driveably connected to the torque converter input by fluid coupling within the torque converter;
- a selectable second driving connection between the torque converter input and the gearbox input shaft, wherein the second torque converter output is mechanically constrained to rotate at the same rate as the torque first converter output so that the torque converter rotates as a unit when the second driving connection is selected, the second driving connection being defined between the torque converter and the gearbox;
- wherein the second driving connection further comprises a first gear carried on a shaft connected to the casing of the torque converter and a lay shaft disposed alongside the second torque converter output, wherein a second gear and a third gear are mounted on the lay shaft, the second gear being in mesh with the first gear, and wherein a fourth gear is provided on the second torque converter output in mesh with the third gear;
- and
- a lock up clutch able to select one of the first driving connection and the second driving connection, wherein the lock up clutch is selectively engageable with the second driving connection so as to constrain the second torque converter output to rotate at the same rate as the first torque converter output.
4 more elements
Dependencies are inferred from the claim text.