Continuously variable power-split transmission
First Claim
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1. A continuously variable power-split transmission comprising:
- an input shaft which is driven by an engine;
an output shaft;
a first differential gear mechanism which comprises a first rotating member connected to the input shaft, a second rotating member, and a third rotating member, and which distributes the rotation of the first rotating member between the second rotating member and the third rotating member;
a countershaft;
a toroidal variator and a first power transmission mechanism which are connected in series for transmitting rotation between the second rotating member and the countershaft, the toroidal variator comprising an input disk, an output disk, and a power roller which is gripped between the input disk and output disk by a thrusting force corresponding to the rotational torque of the second rotating member, and the first power transmission mechanism transmitting rotation between the output disk and the countershaft;
a second power transmission mechanism for transmitting the rotation of the third rotation member to the countershaft; and
a clutch device for selectively transmitting the rotation of the countershaft and the rotation of the input disk to the output shaft;
wherein a reduction ratio R1 relating to the transmission of rotation by the first transmission mechanism from the output disk to the countershaft, a reduction ratio R2 of the second power transmission mechanism, and a speed ratio α
1 of the third rotating member and the second rotating member are set to values at which, in a state where the clutch device is transmitting the rotation of the input disk to the output shaft, the rotational torque of the second rotating member does not fall below the rotational torque which is transmitted from the first power transmission unit to the output disk.
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Abstract
The second platenary gear mechanism 18 is a so-called double pinion type planetary gear comprising a sun gear 18a, paired pinions 18b, a carrier 18c which supports the pinions, and a ring gear 18d. The pinions 18b of eeach pair meshes with each other in a state where one of the paired pinions 18b meshes with the sun gear 18a while the other one of the paired pinions 18b meshes with the ring gear 18d. The carrier 18c is coupled to the countershaft 20 and the sun gear 18a is connected to a shaft 11a which is coupled to a gear 11b of a third gear unit 11.
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Citations
6 Claims
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1. A continuously variable power-split transmission comprising:
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an input shaft which is driven by an engine;
an output shaft;
a first differential gear mechanism which comprises a first rotating member connected to the input shaft, a second rotating member, and a third rotating member, and which distributes the rotation of the first rotating member between the second rotating member and the third rotating member;
a countershaft;
a toroidal variator and a first power transmission mechanism which are connected in series for transmitting rotation between the second rotating member and the countershaft, the toroidal variator comprising an input disk, an output disk, and a power roller which is gripped between the input disk and output disk by a thrusting force corresponding to the rotational torque of the second rotating member, and the first power transmission mechanism transmitting rotation between the output disk and the countershaft;
a second power transmission mechanism for transmitting the rotation of the third rotation member to the countershaft; and
a clutch device for selectively transmitting the rotation of the countershaft and the rotation of the input disk to the output shaft;
wherein a reduction ratio R1 relating to the transmission of rotation by the first transmission mechanism from the output disk to the countershaft, a reduction ratio R2 of the second power transmission mechanism, and a speed ratio α
1 of the third rotating member and the second rotating member are set to values at which, in a state where the clutch device is transmitting the rotation of the input disk to the output shaft, the rotational torque of the second rotating member does not fall below the rotational torque which is transmitted from the first power transmission unit to the output disk. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification