Patent ID: 6306059
Filing Date: 2001-10-23
Classification: F16H,Y10T

Abstract:
An infinite speed ratio transmission device for a vehicle comprising:an input shaft;a final output shaft;a planetary gear set comprising a planet gear, a planet carrier supporting the planet gear, a sun gear externally connected to the planet gear, and a ring gear internally connected to the planet gear, the ring gear being joined to the final output shaft;a continuously variable transmission for transmitting a rotation of the input shaft to the sun gear at an arbitrary speed ratio;a fixed speed ratio transmission comprising an input gear fixed to the input shaft, and an output gear which is engaged with the input gear, fixed to the planet carrier and rotating around the final output shaft;a device output gear fixed to the final output shaft; anda final gear engaging with the device output gear;wherein, the input gear, the output gear, the device output gear, the final gear, the sun gear, the planet gear and the ring gear comprise helical gears having oblique tooth traces;the directions of the tooth traces of the sun gear, planet gear and ring gear are set so that a thrust load exerted by the planet carrier, which rotates faster than the sun gear, on the sun gear via the planet gear, and a thrust load exerted by the planet carrier, which rotates faster than the sun gear, on the ring gear via the planet gear, do not cancel each other out;a member is provided which supports a load acting on the sun gear along the final output shaft; andthe directions of the tooth traces of the output gear, the input gear, the device output gear, and the final gear are set so that either of the thrust load acting on the device output gear and the thrust load acting on the output gear is opposite to the thrust load acting on the ring gear,wherein the output gear is disposed between the planetary gear set and the device output gear, and a rotation direction of the final output shaft corresponding to forward motion of the vehicle is anti-clockwise when the planetary gear set is viewed from the device output gear, the tooth trace of the sun gear is right-handed, the tooth trace of the planet gear is left-handed and the tooth trace of the ring gear is left-handed.