Toroidal continuously variable transmission
First Claim
1. A toroidal continuously variable transmission comprising:
- a first shaft whose one end is coupled with an engine;
a second shaft which is disposed in parallel with said first shaft and whose engine side end is coupled with a differential gear unit for driving a left and a right driven wheels;
a toroidal continuously variable transmission mechanism, disposed on said first shaft, including an input disk coupled with said first shaft, an output disk which is disposed on an engine side of said input disk and is rotatably supported on the first shaft, a roller interposed between said both disks for transmitting power therebetween, and a contact point control member which inclinable supports said roller and varies a speed ratio between both disks by changing contact points between said roller and said input and said output disk;
a planetary gear mechanism, disposed on said second shaft, including three rotary elements of a sun gear, an internal gear and a pinion carrier in which among these rotary elements, the first element is coupled with said output disk of said continuously variable transmission mechanism so as to rotate together therewith and the second element is coupled with the second shaft;
a gear train including a first gear which is disposed on the first shaft at an opposite side, with respect to the engine, of the continuously variable transmission mechanism for a rotatable movement together with the first shaft, a second gear which is rotatably supported on the second shaft at an opposite side, with respect to the engine, of the planetary gear mechanism, and an idle gear which is engaged with said first and said second gears to transmit a power therebetween;
a first clutch mechanism for engaging or disengaging said second gear of said gear train with the third element of the planetary gear mechanism;
a power transmission path for transmitting a driving torque from said output disk to the second shaft without passing it through said planetary gear mechanism;
a second clutch mechanism for engaging or disengaging said power transmission path; and
a control unit for controlling an operation of said contact point control member, said first clutch mechanism, and said second clutch mechanism.
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Accused Products
Abstract
The object of the present invention is to provide compact toroidal type continuously variable transmission for a front engine front wheel drive vehicle, which employs geared neutral starting system. The toroidal type continuously variable transmission according to the present invention comprises an input shaft 11 whose one end is coupled with an engine, a primary shaft 12 into which said input shaft is fittingly inserted with play, a secondary shaft 13 which is disposed parallel with said shafts and whose engine side end is coupled with a differential gear unit 5, toroidal type continuously variable transmission mechanisms 20, 30 which are disposed on said primary shaft 12, a planetary gear mechanism 50 which is disposed on said secondary shaft 13, a low mode gear train 80 for coupling the input shaft 11 with a carrier 51 of the planetary gear mechanism 50, and a high mode gear train 90 for coupling a sun gear 52 with an output disk 34 of the continuously variable transmission mechanisms 20, 30, wherein said low mode gear train 80 is disposed on an opposite side end, with respect to the engine, of the input shaft 11.
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Citations
8 Claims
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1. A toroidal continuously variable transmission comprising:
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a first shaft whose one end is coupled with an engine;
a second shaft which is disposed in parallel with said first shaft and whose engine side end is coupled with a differential gear unit for driving a left and a right driven wheels;
a toroidal continuously variable transmission mechanism, disposed on said first shaft, including an input disk coupled with said first shaft, an output disk which is disposed on an engine side of said input disk and is rotatably supported on the first shaft, a roller interposed between said both disks for transmitting power therebetween, and a contact point control member which inclinable supports said roller and varies a speed ratio between both disks by changing contact points between said roller and said input and said output disk;
a planetary gear mechanism, disposed on said second shaft, including three rotary elements of a sun gear, an internal gear and a pinion carrier in which among these rotary elements, the first element is coupled with said output disk of said continuously variable transmission mechanism so as to rotate together therewith and the second element is coupled with the second shaft;
a gear train including a first gear which is disposed on the first shaft at an opposite side, with respect to the engine, of the continuously variable transmission mechanism for a rotatable movement together with the first shaft, a second gear which is rotatably supported on the second shaft at an opposite side, with respect to the engine, of the planetary gear mechanism, and an idle gear which is engaged with said first and said second gears to transmit a power therebetween;
a first clutch mechanism for engaging or disengaging said second gear of said gear train with the third element of the planetary gear mechanism;
a power transmission path for transmitting a driving torque from said output disk to the second shaft without passing it through said planetary gear mechanism;
a second clutch mechanism for engaging or disengaging said power transmission path; and
a control unit for controlling an operation of said contact point control member, said first clutch mechanism, and said second clutch mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification