Abstract A toroidal continuously variable transmission comprises a friction roller disposed between co-axial input and output discs and in driving contact therewith, and a roller carrier rotatably supporting the friction roller. A hydraulic actuator is operative to shift the roller carrier along a carrier axis. The hydraulic actuator is operable on hydraulic pressure supplied thereto by a ratio control valve. The ratio control valve includes a valve sleeve (i.e., a first member) moveable along a valve axis, and a spool (i.e., a second member) received in the valve sleeve and moveable along the valve axis, and a ratio control valve for regulating supply of hydraulic fluid to and discharge thereof from the hydraulic actuator in response to relative movement of the spool to the sleeve. A control arrangement includes a stepper motor for changing the sleeve from an initial position to a desired position. A cam is connected to the roller carrier for unitary motion about the carrier axis. A cam follower operatively disposed between the cam and one end of the spool. An adjustor is provided between the cam follower and the one end of the spool for adjusting relation between the rotary motion of the cam and the corresponding linear motion of the spool.
In a toroidal continuously variable transmission: a housing; co-axial input and output discs having facing toric surfaces; a friction roller disposed between and in driving contact with said toric surfaces for transmitting torque between said input and output discs; a roller carrier rotatably supporting said friction roller; means grounded to said housing for rotatably supporting said roller carrier about a carrier axis; hydraulic actuator means for biasing said roller carrier along said carrier axis; ratio control valve means for controlling said hydraulic actuator means, said ratio control valve means including a first member moveable along a valve axis, a second member cooperating with said first member and moveable along said valve axis, and means for regulating supply of hydraulic fluid to and discharge thereof from said hydraulic actuator means in response to movement of said first member relative to said second member; means for changing said first member from an initial position to a desired position; means for converting a rotary motion of said roller carrier about said carrier axis into a linear motion of said second member along said valve axis; and means for adjusting relationship between said rotary motion of said roller carrier about said carrier axis and said linear motion of said second member along said valve axis.
Claim 2
Dependent Claim
211 words
In a toroidal continuously variable transmission: a housing; co-axial input and output discs having facing toric surfaces; a friction roller disposed between and in driving contact with said toric surfaces for transmitting torque between said input and output discs; a roller carrier rotatably supporting said friction roller; means grounded to said housing for rotatably supporting said roller carrier about a carrier axis; hydraulic actuator means for biasing said roller carrier along said carrier axis; ratio control valve means for controlling said hydraulic actuator means, said ratio control valve means including a first member moveable along a valve axis, a second member cooperating with said first member and moveable along said valve axis, and means for regulating supply of hydraulic fluid to and discharge thereof from said hydraulic actuator means in response to movement of said first member relative to said second member; means for changing said first member from an initial position to a desired position; means for converting a rotary motion of said roller carrier about said carrier axis into a linear motion of said second member along said valve axis; and means for adjusting relationship between said rotary motion of said roller carrier about said carrier axis and said linear motion of said second member along said valve axis.
Claim 3
Dependent Claim
37 words
A toroidal continuously variable transmission as claimed in claim 1, wherein said converting means includes a precess cam, and said adjusting means is disposed between said precess cam and said second member of said ratio control valve.
Claim 4
Dependent Claim
41 words
A toroidal continuously variable transmission as claimed in claim 2, wherein said converting means includes a precess cam and a cam follower, and said adjusting means is provided between said cam follower and said second member of said ratio control valve.