Rotary transmission
First Claim
1. A motor vehicle engine and transmission combination comprising a drive clutch, an input shaft for the transmission to which drive is transmitted from the engine by the drive clutch, an output shaft for the transmission, a plurality of gear trains which provide a series of increasing drive ratios between the input shaft and the output shaft, each gear train comprising a gear wheel on the input shaft and a gear wheel selectively drivably connectable to the output shaft by selector means, automatic change speed means to operate said selectors, and a further clutch having a driving member drivably connected to said engine, said further clutch being responsive to said change speed means to control the engine speed during a ratio change between one said ratio and the next higher ratio with said drive clutch disengaged to substantially synchronize engine speed with the speed of said transmission input shaft speed, said further clutch having a driven member drivably connected to the transmission output shaft to enable drive to be transmitted between the engine and the transmission output shaft during the speed ratio change with the drive clutch disengaged.
1 Assignment
0 Petitions
Accused Products
Abstract
The transmission is intended to effect synchronism between the speed of an engine and the speed of a transmission input shaft. An engine drive clutch and gearbox combination is provided which comprises automatic change speed to engage and disengage the drive clutch and to select a required gearbox ratio. A further clutch is also provided which is responsive to said change speed to control engine speed during a ratio change with the drive clutch disengaged. The further clutch reacts against the output shaft of the gearbox to synchronize engine speed with the speed of the transmission input shaft during the ratio change and enables drive to be transmitted between the engine and output shaft with the drive clutch disengaged.
87 Citations
11 Claims
- 1. A motor vehicle engine and transmission combination comprising a drive clutch, an input shaft for the transmission to which drive is transmitted from the engine by the drive clutch, an output shaft for the transmission, a plurality of gear trains which provide a series of increasing drive ratios between the input shaft and the output shaft, each gear train comprising a gear wheel on the input shaft and a gear wheel selectively drivably connectable to the output shaft by selector means, automatic change speed means to operate said selectors, and a further clutch having a driving member drivably connected to said engine, said further clutch being responsive to said change speed means to control the engine speed during a ratio change between one said ratio and the next higher ratio with said drive clutch disengaged to substantially synchronize engine speed with the speed of said transmission input shaft speed, said further clutch having a driven member drivably connected to the transmission output shaft to enable drive to be transmitted between the engine and the transmission output shaft during the speed ratio change with the drive clutch disengaged.
-
11. A motor vehicle engine and transmission comprising a drive clutch, an input shaft for the transmission to which drive is transmitted from the engine by the drive clutch, an output shaft for the transmission, a plurality of gear trains which provide a series of increasing drive ratios between the input shaft and the output shaft, each gear train comprising a gear wheel on the input shaft and a gear wheel selectively drivably connectable to the output shaft by selector means, automatic change speed means to operate said selectors, and a further clutch responsive to said change speed means to control the engine speed during a ratio change between one said ratio and the next higher ratio with said one clutch disengaged to substantially synchronise engine speed with the speed of said transmission input shaft, said further clutch including a driven member drivably connected to the engine and a driven member drivably connected to said output shaft by a two wheel gear train which provides a further drive ratio to enable drive to be transmitted between the engine and the transmission output shaft during the speed ratio change with the drive clutch disengaged said selector means being arranged to select said increasing drive ratios one after the other in ascending or decending order and to select said further drive ratio at one end of the range of said increasing drive ratios.
Specification