Abstract:
A first embodiment of a vehicle transmission with continuously variable transmission ratio contains a CVT variator with two variator shafts, an input shaft that can optionally be brought into rotational engagement with one or the other of the variator shafts, and an output shaft that can optionally be brought into rotational engagement with one or the other of the variator shafts, such that two forward driving ranges with opposite torque transmission directions of the CVT variator are present, whose transmission ratio ranges are constantly contiguous with each other.
Abstract:
PROBLEM TO BE SOLVED: To improve transmission efficiency of a drive force of a continuously variable transmission which can continuously change travel mode among forward movement, stop, and backward movement.SOLUTION: The continuously variable transmission is equipped with: a CVT10 in which drive power from an engine 1 is input, and is output by continuously adjusting the transmission gear ratio; a CVT20 in which the drive power from the engine 1 is inverted and input, and then is output by continuously adjusting the transmission gear ratio; and a planetary gear mechanism 30, in which the outputs from the CVT10 and the CVT20 are input, and the drive power is combined and is output to an output shaft 60a. The output from one of the CVT10 and the CVT20 is input to a sun gear 31 of the planetary gear mechanism 30, the output from the other of the CVT10 and the CVT20 is input to a ring gear 34, and the combined drive power is output from a planetary carrier 33.
Abstract:
PROBLEM TO BE SOLVED: To solve the problem that it is difficult to properly start an engine 12 when a power splitting device 20 is provided among a motor generator 10, an engine 12 and a driving wheel 14. SOLUTION: This power splitting device 20 is configured such that a ring gear R and a sun gear S of a first planetary gear mechanism 22 are connected to a carrier C and a sun gear S of a second planetary gear mechanism 24, respectively. A rotary shaft 10a of the motor generator 10 is connected to a ring gear R of the second planetary gear mechanism 24, and connected to a pair of sun gears S via a CVT 36. When the engine 12 is started, by engaging a clutch 30, initial rotation is given to a rotary shaft 12a of the engine 12 by the carrier C of the first planetary gear mechanism 22. After the engine 12 is started, a torque of the engine 12 is given to a pair of the sun gears S via a one-way bearing 34. COPYRIGHT: (C)2011,JPO&INPIT