| 摘要 |
An apparatus is provided to expand the direct drive region of the torque converter in a five or six-speed automatic transmission apparatus for front wheel drive to greatly improve the power performance and fuel economy thereof. The apparatus has a first shaft 10, a second shaft 31, planetary gear trains 11 and 12 disposed on second shaft 31, counter gears pairs X, Y, three clutches, and two brakes. The pair of counter gears have different gear ratios and serve to couple the first shaft with each of the structural elements of the planetary gear trains. The clutches and brakes selectively couple two elements to control the power transmission path. The pair of counter gears X is connected to the first structural element of the planetary gear trains via the first clutch and the pair of counter gears Y is connected to either the first and second structural elements or the second and fourth structural elements of the planetary gear trains via the second or third clutch. The two brakes are connected to either the second and fourth structural elements or the first and second structural elements of the planetary gear trains. The third structural element serves as the output. |
