Patent ID: 8845478
Filing Date: 2014-09-30
Classification: F16H,Y10T

Abstract:
1. An automatic transmission having a reverse range for backward-running, a neutral range without power transmission, a drive range for forward-running by automatic gear shifting, and a low range for forward-running at a given shift stage, and disabling an engine braking force to act at the given shift stage when the drive range is selected by manually operating a selector lever, and enabling an engine braking force to act at the given shift stage when the low range is manually selected, comprising: an input member adapted to be connected to a transmission input shaft; a first meshing mechanism having a first hub rotating with the input member, a first sleeve rotating with the first hub and configured to be slidable in two opposite rotation-axis directions, and a first clutch gear configured to be rotatable together with the first sleeve by bringing the first clutch gear into meshed-engagement with the first sleeve by an axial sliding motion of the first sleeve; a second meshing mechanism having a second hub rotating with the first clutch gear, a second sleeve rotating with the second hub and configured to be slidable in the two opposite rotation-axis directions, and a second clutch gear configured to be rotatable together with the second sleeve by bringing the second clutch gear into meshed-engagement with the second sleeve by an axial sliding motion of the second sleeve; a one-way clutch provided between the second hub and the second clutch gear and configured to run free when a revolution speed of the second clutch gear is higher than that of the second hub; a first linkage for bringing the first meshing mechanism into meshed-engagement with the first clutch gear by sliding the first sleeve in synchronism with manual movement of the selector lever from the neutral range to the drive range; a second linkage for bringing the second meshing mechanism into meshed-engagement with the second clutch gear by sliding the second sleeve in synchronism with manual movement of the selector lever from the drive range to the low range; and a first rotating part connected to the second clutch gear and configured to permit a driving force to be transmitted from the input member via the one-way clutch to the first rotating part with the first meshing mechanism kept in meshed-engagement with the first clutch gear when the drive range is selected and further configured to permit a driving force to be transmitted from the input member, without the transmitting of the driving force being via the one-way clutch, to the first rotating part with the first meshing mechanism kept in meshed-engagement with the first clutch gear and the second meshing mechanism kept in meshed-engagement with the second clutch gear when the low range is selected.