摘要:
A multiple-regime continuously variable ratio transmission system has a system input shaft (I), a system output shaft (0) and a continuously variable ratio transmission unit (variator) connected to the system input shaft and having a variator output shaft. A first mixing epicyclec gear train (P1) having inputs drivably connected to the variator output shaft (V) and the system input shaft via a first clutch (H) and a second mixing epicyclic gear train having inputs drivably connected to the variator output shaft and the system input shaft has an output (28) connected to a third epicyclic gear train (E2) having an output which is selectively connectable to the to the system output shaft via a first braking element (L). A second braking element (B) is adapted to lock the output (28) of the second mixing epicyclic gear train in a stationary position.
摘要:
A variator of the toroidal race rolling traction type has a rotatably mounted input disc (18, 20) an output disc (22) rotatably mounted coaxially with the input disc (18, 20), a plurality of rollers (30, 32) transmitting rotation between the input disc and the output disc and a plurality of double-acting pistons (36, 38) each acting upon a respective one of the rollers. The variator also has a plurality of levers (44, 60) each connected to a respective one of the rollers (30, 32) and its associated actuator (36, 38). By connecting the actuators to the rollers via levers a much more compact arrangement can be achieved.
摘要:
There is described a method of controlling a continuously variable ratio transmission of the type comprising a continuously variable ratio unit ('variator') which has rotary input and output members though which the variator is coupled between an engine and a driven component, the variator receiving a primary control signal and being constructed and arranged such as to exert upon its input and output members torques which, for a given variator drive ratio, correspond directly to the control signal, the method comprising: determining a target engine acceleration, determining settings of the variator's primary control signal and of an engine torque control for providing the required engine acceleration and adjusting the control signal and/or the engine torque control based on these settings, predicting a consequent engine speed change, allowing for engine and/or transmission characteristics, and correcting the settings of the control signal and engine torque based on a comparison of actual and predicted engine speeds.
摘要:
A fluid display arrangement is disclosed for a rolling-traction continuously-variable ratio transmission unit in which drive is transmitted from one race to another by at least one rotating roller whose outer circumference engages the races, the fluid supply arrangement comprising a shroud mounted in proximity to the roller and a fluid supply conduit, and being characterised in that the shroud has an inner surface providing a circumferential portion adjacent the roller’s outer circumference and two radially extending portions adjacent respective flanks of the roller, a fluid receiving chamber being thereby defined between the roller and the shroud, and the fluid supply conduit being arranged to deliver fluid into the fluid receiving chamber.
摘要:
A roller and bearing assembly for a rolling-traction continuously variable transmission unit wherein the roller (102) has an outer periphery for running on a pair of transmission races to transmit drive from one to the other and comprises a hoop for bearing compressional force applied to the roller by the transmission races, the bearing comprising a rotary bearing (204) disposed within the roller hoop and having inner and outer bearing races, a coupling (206) between the roller hoop and the bearing serving to rotatably mount the roller upon the bearing and to accommodate deformation of the roller hoop due to the compressional force without corresponding deformation of the outer bearing race.
摘要:
A multi-regime continuously variable ratio transmission system has coaxial system input and output shafts (16, 24), a continously variable ratio transmission unit (V) connected coaxially to the system input shaft (16) and having a coaxial variator output shaft (18) and a mixing epicyclic gear train (E1) having an input sun gear (S1) drivably connected to the variator ouput shaft (18), a planet carrier (C1) drivably connected to the system input shaft (16) and a planet gear (P1) mounted on the planet carrier ((C1). The planet gear (P1) drives a first intermediate output shaft (22) arranged coaxially with the system input shaft (16) and selectively connectable to the system output shaft via a first clutch (H) in high-regime operation of the transmission. The planet gear (P1) also provides the input for a second epicyclic gear train (E2) having an output (C2) which is selectively connectable to the system output shaft via a braking element (L) for low-regime operation of the transmission. The arrangement minimises the number of gear meshes, thereby minimising transmission losses and the absence of an annulus in the mixing epicyclic gear train (E1) allows more freedom in the choice of gear sizes, thereby permitting reduced gear speeds.
摘要:
A multi-regime continuously variable ratio transmission has an output shaft (16), a variator and epicyclic gear sets (E1, E2) arranged coaxially to provide drive to two coaxial output shafts (20, 26). The drive from the coaxial output shafts (20, 26) is selectively connectable to an offset system output shaft (22) by means of high-and low-regime clutches (H, L) arranged coaxially with the system output shaft (22).
摘要:
A fluid display arrangement is disclosed for a rolling-traction continuously-variable ratio transmission unit in which drive is transmitted from one race to another by at least one rotating roller whose outer circumference engages the races, the fluid supply arrangement comprising a shroud mounted in proximity to the roller and a fluid supply conduit, and being characterised in that the shroud has an inner surface providing a circumferential portion adjacent the roller’s outer circumference and two radially extending portions adjacent respective flanks of the roller, a fluid receiving chamber being thereby defined between the roller and the shroud, and the fluid supply conduit being arranged to deliver fluid into the fluid receiving chamber.
摘要:
A hydraulic control system (70) for a multi-regime CVT (8) includes regime-change clutches (37, 38) which are controlled independently of the variator (10) so that a smooth change of regime may be effected.