Three-section hydraulic mechanical stepless transmission device for loader

A three-section hydraulic mechanical stepless transmission device for a loader, comprising:

• a casing, a hydraulic speed control circuit, an ahead and astern mechanism, a split-collecting mechanism, a hydraulic section fixed shaft gear transmission system, a first hydraulic mechanical section fixed shaft gear transmission system, a second hydraulic mechanical section fixed shaft gear transmission system, and an output portion;
• wherein:
• the hydraulic speed control circuit comprises a hydraulic pump, a slippage pump, and a variable motor;
• the ahead and astern mechanism comprises a main input shaft, a fourth gear, a seventh gear, a ninth gear, a tenth gear, a twelfth gear, a first clutch, and a second clutch;
• the split-collecting mechanism comprises a first planet carrier, a twenty-third gear, a twenty-first gear ring, a second planet carrier, a second sun wheel, and a nineteenth gear;
• the hydraulic section fixed shaft gear transmission system comprises a third clutch, a twenty-seventh gear, and a twenty-ninth gear;
• the first hydraulic mechanical section fixed shaft gear transmission system comprises a fourth clutch;
• the second hydraulic mechanical section fixed shaft gear transmission system comprises a fifth clutch;
• the output portion comprises a twenty-fourth gear, a twenty-fifth gear, a thirtieth gear, and a main output shaft;
• the main input shaft is movably connected with the casing;
• the fourth gear and the second clutch are fixedly disposed on a portion of the main input shaft located inside the casing;
• the ninth gear is rotatably disposed on the portion of the main input shaft located inside the casing;
• a driving end of the second clutch is in power connection with the ninth gear;
• an end portion of the main input shaft is in power connection with the slippage pump;
• a power input shaft of the hydraulic pump is movably connected with the casing;
• a fifth gear is meshed with the fourth gear and fixedly disposed on a portion of the power input shaft of the hydraulic pump located inside the casing;
• the first planet carrier is fixedly disposed at an end portion of a first half shaft, the other end of the first half shaft is movably connected with the casing;
• a plurality of first planet gears are disposed on the first planet carrier;
• the first clutch and the twelfth gear are fixedly disposed on the first half shaft;
• the seventh gear is meshed with the fourth gear and rotatably disposed on the first half shaft;
• the twelfth gear is in power connection with the ninth gear through the tenth gear;
• the driving end of the first clutch is in power connection with the seventh gear;
• the three-section hydraulic mechanical stepless transmission device further comprises a fourteenth gear, fixedly disposed at the end of a second half shaft, and the other end of the second half shaft is movably connected with the casing;
• the fourteenth gear is meshed with the plurality of first planet gears;
• the second sun wheel and the fifth clutch are fixedly disposed on the second half shaft;
• the nineteenth gear is rotatably disposed on the second half shaft;
• the plurality of first planet gears are meshed with a fifteenth gear ring, the fifteenth gear ring is fixedly connected with the second planet carrier, the second planet carrier is rotatably connected with one side of each of a plurality of second planet gears, the other side of each of the plurality of second planet gears is rotatably connected with the driven end of the fourth clutch;
• the plurality of second planet gears are meshed with internal teeth of the twenty-first gear ring;
• the nineteenth gear is in power connection with the fifth clutch and the driving end of the fourth clutch;
• the twenty-fifth gear is fixedly disposed on a first intermediate shaft movably connected with the casing;
• the twenty-fifth gear is in power connection with the nineteenth gear through the twenty-fourth gear;
• the third clutch is fixedly disposed on the first intermediate shaft;
• the twenty-seventh gear is meshed with external teeth of the twenty-first gear ring and rotatably disposed on the first intermediate shaft;
• the driven end of the third clutch is in power connection with the twenty-seventh gear;
• the main output shaft is movably connected with the casing;
• the thirtieth gear is meshed with the twenty-fifth gear and fixedly disposed on the main output shaft;
• a power input shaft of the variable motor is movably connected with the casing;
• the twenty-ninth gear is meshed with the twenty-seventh gear and fixedly disposed on a portion of the power input shaft of the variable motor located inside the casing;
• and
• the variable motor and the hydraulic pump form a closed hydraulic circuit.