| 摘要 |
The driven pulley (10) is used in a continuously variable transmission (CVT). It is coaxially mountable around a main shaft (12) and comprises two opposite conical flanges, namely a first flange (14) and a second flange (18), which face each other. An annular cam plate (40) is coaxially connected to the side of the second flange (18) that is opposite the first flange (14). The cam plate (40) comprises at least two inclined first cam surfaces (42) and at least two inclined second cam surfaces (44) having an inverted inclination with reference to the first cam surfaces (42). A first radially-extending support (50) bears a set of first cam followers (54). The first support (50) is at a fixed axial distance from the first flange (14) and each first cam follower (54) is engaged with a respective one of the first cam surfaces (42). Similarly, a second radially-extending support (60) bear a set of second cam followers (64). The second support (60) is also at a fixed axial distance from the first flange (14) and each second cam follower (64) is engaged with a respective one of the second cam surfaces (44). Spiral springs (70) are mounted between the first support (50) and the second support (60). This driven pulley (10) allows a control of the return force of the springs (70, 70') and maintains a good gripping force on the drivebelt (24) even when subjected to a reverse torque. |
