Infinite speed ratio continuously variable transmission
First Claim
1. An infinite speed ratio continuously variable transmission, comprising:
- an unit input shaft;
a continuously variable transmission which transmits a rotation of the unit input shaft to a first output shaft at an arbitrary speed ratio;
a fixed speed ratio transmission which transmits the rotation of the unit input shaft to a second output shaft at a fixed speed ratio a direct mode clutch;
a power recirculation mode clutch, one of the direct clutch and the power recirculation mode clutch comprising an electromagnetic two-way clutch that, when energized, transmits a drive force in a first direction and in a second direction opposite to the first direction, and, when not energized, transmits a drive force only in a direction of a drive force transmission when energizing has stopped and disengages upon receiving a drive force in an opposite direction; and
a planetary gear set comprising a first rotation element joined to the first output shaft via the direct mode clutch, a second rotation element joined to the second output shaft via the power recirculation mode clutch, and a third rotation element which varies a rotation direction and a rotation speed according to a difference between a rotation speed of the first rotation element and a rotation speed of the second rotation element.
1 Assignment
0 Petitions
Accused Products
Abstract
An infinite speed ratio continuously variable transmission comprises a power recirculation mode clutch (9) and direct mode clutch (10). At least one of the power recirculation mode clutch (9) and direct mode clutch (10) comprises an electromagnetic two-way clutch. The electromagnetic two-way clutch maintains the engaged state during excitation and can transmit drive force from both the drive side and non-drive side. On the other hand, when there is a change-over from the energized state to the non-energized state, a one-way clutch state is obtained wherein drive force is permitted only in the transmission direction of drive force in the instant of the change-over to non-excitation. When a drive force is input in the reverse direction to the drive force transmitted in the one-way clutch state, the one-way clutch state is disengaged, and the disengaged state of the clutch is maintained until subsequent re-excitation. Therefore, change-over of the clutch at the rotation synchronous point RSP where the power recirculation mode and direct mode are changed over, can be performed rapidly.
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Citations
16 Claims
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1. An infinite speed ratio continuously variable transmission, comprising:
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an unit input shaft;
a continuously variable transmission which transmits a rotation of the unit input shaft to a first output shaft at an arbitrary speed ratio;
a fixed speed ratio transmission which transmits the rotation of the unit input shaft to a second output shaft at a fixed speed ratio a direct mode clutch;
a power recirculation mode clutch, one of the direct clutch and the power recirculation mode clutch comprising an electromagnetic two-way clutch that, when energized, transmits a drive force in a first direction and in a second direction opposite to the first direction, and, when not energized, transmits a drive force only in a direction of a drive force transmission when energizing has stopped and disengages upon receiving a drive force in an opposite direction; and
a planetary gear set comprising a first rotation element joined to the first output shaft via the direct mode clutch, a second rotation element joined to the second output shaft via the power recirculation mode clutch, and a third rotation element which varies a rotation direction and a rotation speed according to a difference between a rotation speed of the first rotation element and a rotation speed of the second rotation element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification