NON-STAGE TRANSMISSION FOR AUTOMOBILE

PURPOSE: To simplify the structure and reduce the cost by comprising a pair of planetary gears engaged with a sun gear of an input and output shaft and having a common gear shaft, forming a gear pump with a first pump gear through which the gear shaft is penetrated and a second pump gear engaged with the first pump gear, and mounting an opening-closing valve on a line for circulating the oil to the gear pump. CONSTITUTION: When an input shaft 41 is rotated, a planetary gear 2 engaged with a sun gear 4 and a planetary gear 3 integrated with the planetary gear 2 rotate, a first pump gear 5 is rotated through a gear shaft 44, and the planetary gears 2, 3 are revolved. A second pump gear 6 is rotated in accompany with the rotation of the pump gear 5, so that the oil in a gear pump chamber is discharged from an outlet 48 to a circulating oil pipe 29 and circulated to the gear pump chamber from an oil inlet 47. When an acceleration pedal is pressed, an opening-closing valve 28 is closed in accompany with the acceleration of an input shaft 41, the pressure in the gear pump is increased, and the revolving speed of the planetary gears 2, 3 is reduced, so that they finally rotate and an output shaft 42 is accelerated. Whereby a transmission of simple structure can be provided.