Planetary gear train transmission device of hybrid vehicle

A planetary gear train transmission device of a hybrid vehicle, comprising an input shaft (11), an output shaft (14), a front-end motor (18), a rear-end motor (17), a first clutch (15), and a second clutch (16), wherein one end of the input shaft (11) is connected to an engine power system, and another end of the input shaft (11) is connected to the front-end motor (18) through a front-end planetary gear train;

• the second clutch (16) is mounted between the other end of the input shaft and the output shaft (14);
• the first clutch (15) is mounted between the front-end planetary gear train and the output shaft (14);
• the rear-end motor (17) is connected to the output shaft (14) through a rear-end planetary gear train;
• and selection of different speed ratios and different working modes are achieved by means of different combinations of the first clutch (15) and the second clutch (16) and different working states of an engine, the rear-end motor (17), and the front-end motor (18);
• wherein the front-end planetary gear train comprises a first sun wheel (21), a first planetary wheel (22), a second sun wheel (31), a second planetary wheel (32), a second outer tooth ring (34), and a second planetary frame (33);
• the rear-end planetary gear train comprises a third sun wheel (41), a third planetary wheel (42), a third outer tooth ring (44), and a third planetary frame (43);
• in the front-end planetary gear train, the second outer tooth ring (34) is fixedly constrained;
• the first planetary wheel (22) is rigidly connected to the second planetary wheel (32);
• the second sun wheel (31) and the second planetary frame (33) form a first speed ratio relation;
• the first sun wheel (21) and the second planetary frame (33) form a second speed ratio relation;
• the first sun wheel (21) and the second sun wheel (31) form a third speed ratio relation;
• the other end of the input shaft (11) is connected to the second sun wheel (31) and one end of a second clutch inner hub (12);
• another end of the second clutch inner hub (12) is connected to the second clutch (16);
• one end of the second planetary frame (33) is connected to one end of the first clutch (15);
• the first clutch (15) and the second clutch (16) are jointly connected to one end of a clutch frame (13), and another end of the clutch frame (13) and one end of the third planetary frame (43) are jointly connected to the output shaft (14);
• the rear-end motor (17) is connected to the third sun wheel (41), and the third outer tooth ring (44) is fixedly mounted on a housing (19);
• the front-end motor (18) is connected to the first sun wheel (21);
• the second planetary wheel (32) and the first planetary wheel (22) are mounted on the second planetary frame (33);
• and the second outer tooth ring (34) is fixedly mounted on the housing (19).