CONTINUOUSLY VARIABLE TRANSMISSION

摘要

A stepless transmission 1 is provided for preventing drive wheels from being driven despite the driver's intention during vehicle deceleration. A control device 40: when the required drive force of the vehicle is 0, controls the output rotational speed Ne of a travel drive source 50 to be Ne2, and controls the transmission gear ratio i of the transmission 1 so that the transmission 1 in the case where the Ne is Ne1 changes from a first state to a second state; and when the vehicle speed V is less than a boundary speed Vgn, controls the ratio i to be a state maintaining transmission gear ratio ign that enables the first state to be maintained even during vehicle deceleration. In the second state a rotational drive force is transmitted from an input shaft 2 to an output shaft 3. In the first state the transmission is prevented.

主权项

1. A stepless transmission comprising:
an input portion to which a rotational drive force from a travel drive source is transmitted; an output portion that transmits a rotational drive force to a drive wheel; a transmission portion that changes the rotational drive force from the input portion, and transmits the changed rotational drive force to the output portion; a one-way rotation blocking mechanism that includes a first element connectable to the transmission portion and a second element connectable to the output portion, and locks the first element to the second element when the first element tries to relatively rotate to one side with respect to the second element, and lets the first element idle with respect to the second element when the first element tries to relatively rotate to the other side with respect to the second element; and a control unit that controls a transmission gear ratio of the stepless transmission, wherein a first target rotational speed is defined, the first target rotational speed being a target of an output rotational speed of the travel drive source when a state of the stepless transmission changes from a first state in which transmission of the rotational drive force from the first element to the second element is prevented to a second state in which the rotational drive force is transmitted from the first element to the second element, and wherein the control unit: when a required drive force of a vehicle is 0, controls the travel drive source so that the output rotational speed of the travel drive source is a second target rotational speed lower than the first target rotational speed, and controls the transmission gear ratio of the stepless transmission to be a transmission gear ratio which is a boundary where the state of the stepless transmission in a case where the output rotational speed of the travel drive source is the first target rotational speed changes from the first state to the second state; and when the required drive force of the vehicle is 0 and a travel speed of the vehicle is less than a predetermined speed, controls the transmission gear ratio of the stepless transmission to be a predetermined transmission gear ratio that enables the first state to be maintained even in a case where the vehicle is decelerated.