초록 ▼

A continuously variable transmission configured to reduce response delay and hunting due to overshooting. The continuously variable transmission is electronically controlled by a control unit. The control unit is connected to an actuator for moving a moving flange of a primary sheave and controls th

A continuously variable transmission configured to reduce response delay and hunting due to overshooting. The continuously variable transmission is electronically controlled by a control unit. The control unit is connected to an actuator for moving a moving flange of a primary sheave and controls the output of the actuator in such a manner as to vary between upshift and downshift of the continuously variable transmission.

대표청구항 ▼

1. A belt type continuously variable transmission, comprising: an actuator;a primary sheave and a secondary sheave each having a V-groove and a belt wound around the V-grooves of the sheaves, wherein groove widths of the sheaves are varied to control a speed change ratio steplessly, whereinthe prima

1. A belt type continuously variable transmission, comprising: an actuator;a primary sheave and a secondary sheave each having a V-groove and a belt wound around the V-grooves of the sheaves, wherein groove widths of the sheaves are varied to control a speed change ratio steplessly, whereinthe primary sheave and the secondary sheave each have a fixed flange and a moving flange mounted on a rotation shaft,the groove width of the primary sheave is adjusted by controlling movement of the moving flange of the primary sheave by the actuator, and the moving flange of the secondary sheave is biased in a direction to narrow the groove width; anda control unit connected to the actuator, wherein the control unit determines whether a gear change is upshift or downshift, andcontrols an output of the actuator in such a manner so as to change the output of the actuator according to a sheave slide resistance at upshift when the gear change is upshift, andcontrols the output of the actuator in such a manner so as to change the output of the actuator according to a sheave slide resistance at downshift when the gear change is downshift. 2. The continuously variable transmission according to claim 1, wherein the output of the actuator is larger for upshift than for downshift. 3. The continuously variable transmission according to claim 1, further comprising: a storage unit connected to the control unit that stores specified relative moduli corresponding to moving flange positions of the primary sheave,wherein the output of the actuator is controlled according to an actuator manipulation amount calculated by multiplying a command value to the actuator by a relative modulus. 4. The continuously variable transmission according to claim 1, wherein the actuator is an electric motor; andthe output of the electric motor is controlled by electric power supplied to the electric motor. 5. The continuously variable transmission according to claim 4, wherein the electric power supplied to the electric motor is controlled by a duty ratio of a pulse signal output from the control unit. 6. A straddle-type vehicle comprising the continuously variable transmission according to claim 1. 7. The belt type continuously variable transmission of claim 1, further including a storage unit, wherein the control unit reads a value from a map stored in the storage unit, the value corresponding to an actual flange position sensed by a sheave position sensor, and calculates a manipulation amount of the actuator in consideration of the sheave slide resistance at the actual flange position based at least partly on the value read from the map. 8. The continuously variable transmission according to claim 1, wherein the control unit determines a target speed change ratio and determines whether the gear change to the target speed ratio is upshift or downshift. 9. The continuously variable transmission according to claim 1, wherein the sheave slide resistance at downshift is lower than the sheave slide resistance at upshift. 10. A belt type continuously variable transmission, comprising: an actuator;a primary sheave and a secondary sheave each having a V-groove and a belt wound around the V-grooves of the sheaves, wherein groove widths of the sheaves are varied to control a speed change ratio steplessly, whereinthe primary sheave and the secondary sheave each have a fixed flange and a moving flange mounted on a rotation shaft,the groove width of the primary sheave is adjusted by controlling movement of the moving flange of the primary sheave by the actuator, and the moving flange of the secondary sheave is biased in a direction to narrow the groove width;a sheave-position sensor that senses a position of the moving flange of the primary sheave; anda control unit connected to the actuator and to the sheave-position sensor, wherein the control unit determines whether a gear change is upshift or downshift, andcontrols an output of the actuator in such a manner so as to change the output of the actuator according to a sheave slide resistance at upshift corresponding to the moving flange position sensed by the sheave-position sensor when the gear change is upshift, andcontrols the output of the actuator in such a manner so as to change the output of the actuator according to a sheave slide resistance at downshift corresponding to the moving flange position sensed by the sheave-position sensor when the gear change is downshift. 11. The continuously variable transmission according to claim 10, wherein the output of the actuator is larger in Low than in Top. 12. The continuously variable transmission according to claim 10, further comprising: a storage unit connected to the control unit that stores specified relative moduli corresponding to moving flange positions of the primary sheave; andthe output of the actuator is controlled according to an actuator manipulation amount calculated by multiplying a command value to the actuator by a relative modulus. 13. The continuously variable transmission according to claim 10, wherein the actuator is an electric motor; andthe output of the electric motor is controlled by electric power supplied to the electric motor. 14. The continuously variable transmission according to claim 13, wherein the electric power supplied to the electric motor is controlled by a duty ratio of a pulse signal output from the control unit. 15. A straddle-type vehicle comprising the continuously variable transmission according to claim 10. 16. The belt type continuously variable transmission of claim 10, further including a storage unit, wherein the control unit reads a value from a map stored in the storage unit, the value corresponding to the moving flange position, and calculates a manipulation amount of the actuator in consideration of the sheave slide resistance at the moving flange position based at least partly on the value read from the map. 17. The continuously variable transmission according to claim 10, wherein the control unit determines a target speed change ratio and determines whether the gear change to the target speed ratio is upshift or downshift. 18. The continuously variable transmission according to claim 10, wherein the sheave slide resistance at downshift is lower than the sheave slide resistance at upshift.