Patent ID: 8840504

Claim:
A continuously variable transmission for a hydraulic mechanism in hybrid cars with recovered power-split energy comprising: a power input shaft ( 10 ) that couples any one of a sun gear, a planet carrier, or a ring gear mainly included in a planet differential gear train pump ( 6 ); the planet carrier or the ring gear being coupled to a power output shaft ( 1 ) of a hydraulic variable pump (motor) ( 2 ); wherein, said power output shaft ( 1 ) of said hydraulic variable pump (motor) ( 2 ) and said power input shaft being disposed coaxially; said sun gear, said planet carrier, and said ring gear being not fixed to a pump housing; said planet differential gear train pump ( 6 ) allowing a mechanical torque of said power input shaft ( 10 ) to be transmitted to said power output shaft ( 1 ) and allowing partial mechanical energy to be transformed into static energy of hydraulic fluid; a hydraulic controlling valve block ( 12 ) conveying said static energy of hydraulic fluid to said hydraulic variable pump ( 2 ); said hydraulic variable pump ( 2 ) transforming said static energy of hydraulic fluid into a rotative mechanical torque so as to add said mechanical torque and said input torque to said power output shaft ( 1 ); a stationary part of a friction brake ( 9 ) being fixed to said pump housing; and a moving part of said friction brake being fixed to said power input shaft ( 10 ); an entrance ( 3 ) for the hydraulic variable pump, an exit ( 4 ) for the hydraulic variable pump, two inlets ( 7 ) of said planet differential gear train pump, two outlets ( 8 ) of said planet differential gear train pump, a low pressure reservoir ( 11 ), and a high pressure reservoir ( 14 ) being all attached to said hydraulic controlling valve block ( 12 ); a pressure sensor ( 15 ) being attached to a first passage and a second passage of said high pressure reservoir ( 14 ) for sensing a pressure on said high pressure reservoir ( 14 ); a speed sensor ( 13 ) being connected to said power output shaft ( 1 ) for sensing a rotative speed of said power output shaft ( 1 ); wherein, by an input end of said planet differential gear train pump ( 6 ) being coaxially connected to said power output shaft of said hydraulic variable pump ( 2 ), a speed-collecting unit for the hydraulic mechanism with a power-split system is provided.