| 摘要 |
<p>The present invention relates to a variable transmission having an internal hub, and more particularly, to an apparatus for achieving variable transmission by means of a compact internal transmission by using a plurality of planetary gear sets and a one-way clutch, and thereby obtaining a high gear ratio as well as more accurate gear change by using a forced gear shift function. The present invention relates to the variable transmission comprising: a shaft (100) fixed to a vehicle body; a sprocket (200) rotatably positioned on the outer circumference of the shaft (100) for receiving inputted rotational force; a hub shell (300) for outputting the rotational force; a gear shift portion (400) for gear-shifting the rotational force inputted into the sprocket (200) and outputting same to the hub shell (300), wherein the gear shift portion (400) includes the planetary gear sets provided inside the hub shell (300) and comprising a sun gear, a planetary gear, a carrier, and a ring gear, and an output clutch comprising the one-way clutch; and a control portion (500) for controlling the gear shifting by selectively limiting the rotation of the sun gear by controlling poles provided on the shaft (100) according to the operation of a gear shift lever, wherein the gear shift portion (400) is provided with a low-speed planetary gear set (410), a medium-speed planetary gear set (420), and a high-speed planetary gear set (430), wherein a carrier in the low-speed planetary gear set (410) and a carrier in the medium-speed planetary gear set (420) are integrally formed with a driver, which rotates by receiving the rotational force from the sprocket (200), to form a low- to medium-speed carrier (413), wherein a low-speed planetary gear (412) in the low-speed planetary gear set (410) and a medium-speed planetary gear (422) in the medium-speed planetary gear set (420) are positioned radially in the low- to medium-speed carrier (413) so as to have a specific phase angle difference and to be mutually engaged, wherein a high-speed carrier (433) in the high-speed planetary gear set (430) is integrally formed with a medium-speed ring gear (424) in the medium-speed planetary gear set (420), wherein a first output clutch (440) is provided between the high-speed carrier (433) in the high-speed planetary gear set and the hub shell (300), and wherein a second output clutch (450) is provided between a high-speed ring gear (434) in the high-speed planetary gear set (430) and the hub shell (300). As a result, the present apparatus can maximize salability of a product and significantly improve gear-shifting accuracy.</p> |
