Hybrid transmission device with mechanical continuously variable transmission and control method thereof

A hybrid transmission device with a mechanical continuously variable transmission, comprising:

• an input shaft assembly, wherein the input shaft assembly comprises an input shaft, a first clutch (L1), an intermediate gear, and a transmission shaft:
• a hydraulic transmission assembly, wherein the hydraulic transmission assembly comprises a variable displacement pump, a fixed displacement motor, a second clutch (L2), and a variable displacement pump driving gear pair:
• the variable displacement pump is connected to the transmission shaft sequentially through the second clutch (L2) and the variable displacement pump driving near pair;
• a front planetary gear transmission assembly, wherein the front planetary gear transmission assembly comprises a front planetary gear outer ring gear, a front planetary gear planet carrier, a front planetary gear sun gear, a third brake (B3), and a second brake (B2):
• the third brake (B3) is connected to the front planetary gear sun gear, the input shaft is connected to the front planetary gear sun gear through the first clutch (L1), the second brake (B2) is connected to the front planetary gear outer ring gear, and the front planetary gear outer ring gear is gear-connected to an output end of the fixed displacement motor:
• a rear planetary gear transmission assembly, wherein the rear planetary gear transmission assembly comprises a rear planetary gear outer ring gear, a rear planetary gear planet carrier, a rear planetary gear sun gear, and a first brake (B1) the rear planetary near sun near is connected to the front planetary gear planet carrier, and the first brake (B1) is connected to the rear planetary gear outer ring gear;
• an output shaft, wherein the output shaft is connected to the rear planetary gear planet carrier;
• a mechanical continuously variable transmission, wherein the mechanical continuously variable transmission comprises a cup wheel and ring disc transmission mechanism, a cup wheel and ring disc input shaft, and a cup wheel and ring disc output shaft:
• the cup wheel and ring disc input shaft is gear-connected to the transmission shaft and the front planetary gear planet carrier, a third clutch (L3) is arranged between the cup wheel and ring disc input shaft and the transmission shaft, a fourth clutch (L4) is arranged between the cup wheel and ring disc input shaft and the front planetary gear planet carrier, and the cup wheel and ring disc output shaft is gear-connected to the rear planetary gear outer ring gear,
• wherein single transmission modes and hybrid transmission modes are implemented through combination and engagement/disengagement of the brakes and the clutches, wherein the single transmission modes comprise a hydraulic transmission mode, a mechanical constant-speed transmission mode, and a mechanical continuously variable transmission mode;
• the hybrid transmission modes comprise a mechanical constant-speed and hydraulic hybrid transmission mode, mechanical constant-speed and mechanical variable-speed hybrid transmission modes, and hydraulic and mechanical variable-speed hybrid transmission modes, and
• wherein the hybrid transmission modes are controlled by the following methods:
• in the mechanical constant-speed and hydraulic hybrid transmission mode, engaging the first clutch (L1), the second clutch (L2), and the first brake (B1) while disengaging the third clutch (L3), the fourth clutch (L4), the second brake (B2) and the third brake (B3), so that power passes through the input shaft assembly and is split into two parts;
• one part of the power passes through the input shaft, the intermediate gear, the transmission shaft, the second clutch (L2), and the variable displacement pump driving gear pair to drive the variable displacement pump to work;
• the variable displacement pump outputs high-pressure oil to drive the fixed displacement motor to rotate;
• the power output from the output shaft of the fixed displacement motor passes through the front planetary gear outer ring gear to the front planetary gear planet carrier;
• the other part of the power is input from the input shaft, then sequentially passes through the first clutch (L1) and the front planetary gear sun gear to the front planetary gear planet carrier, and is converged with the power passing through the hydraulic transmission assembly;
• the power after convergence passes through the rear planetary gear sun gear and the rear planetary gear planet carrier and is output from the output shaft;
• the mechanical constant-speed and mechanical variable-speed hybrid transmission modes comprise a mechanical constant-speed and mechanical variable-speed parallel hybrid transmission mode and a mechanical constant-speed and mechanical variable-speed series hybrid transmission mode, wherein
• in the mechanical constant-speed and mechanical variable-speed parallel hybrid transmission mode, power passes through the input shaft assembly and is split into two parts;
• the two parts of the power respectively pass through the front planetary gear transmission assembly and the mechanical continuously variable transmission connected in parallel and are converged at the rear planetary gear planet carrier of the rear planetary gear transmission assembly, and the power after convergence is output from the output shaft;
• in the mechanical constant-speed and mechanical variable-speed series hybrid transmission mode, power sequentially passes through the front planetary gear transmission assembly and the mechanical continuously variable transmission and is converged at the rear planetary gear planet carrier, and the power after convergence is output from the output shaft;
• the hydraulic and mechanical variable-speed hybrid transmission modes comprise a hydraulic and mechanical variable-speed parallel hybrid transmission mode and a hydraulic and mechanical variable-speed series hybrid transmission mode, wherein
• in the hydraulic and mechanical variable-speed parallel hybrid transmission mode, power passes through the input shaft, the intermediate gear, and the transmission shaft and is split into two parts;
• the two parts of the power respectively pass through the hydraulic transmission assembly and the mechanical continuously variable transmission connected in parallel and are converged at the rear planetary gear planet carrier of the rear planetary gear transmission assembly, and the power after convergence is output from the output shaft;
• in the hydraulic and mechanical variable-speed series hybrid transmission mode, power sequentially passes through the hydraulic transmission assembly and the mechanical continuously variable transmission and is converged at the rear planetary gear planet carrier, and the power after convergence is output from the output shaft.

A hybrid transmission device with a mechanical continuously variable transmission, comprising:

• an input shaft assembly, wherein the input shaft assembly comprises an input shaft, a first clutch (L1), an intermediate gear, and a transmission shaft:
• a hydraulic transmission assembly, wherein the hydraulic transmission assembly comprises a variable displacement pump, a fixed displacement motor, a second clutch (L2) and a variable displacement pump driving gear pair;
• the variable displacement pump is connected to the transmission shaft sequentially through the second clutch (L2) and the variable displacement pump driving gear pair;
• a front planetary gear transmission assembly, wherein the front planetary gear transmission assembly comprises a front planetary gear outer ring gear, a front planetary gear planet carrier, a front planetary near sun gear, a third brake (B3) and a second brake (B2);
• the third brake (B3) is connected to the front planetary gear sun gear, the input shaft is connected to the front planetary gear sun gear through the first clutch (L1), the second brake (B2) is connected to the front planetary gear outer ring gear, and the front planetary gear outer ring gear is gear-connected to an output end of the fixed displacement motor;
• a rear planetary gear transmission assembly, wherein the rear planetary gear transmission assembly comprises a rear planetary gear outer ring gear, a rear planetary gear planet carrier, a rear planetary gear sun gear, and a first brake (B1);
• the rear planetary gear sun gear is connected to the front planetary gear planet carrier, and the first brake (B1) is connected to the rear planetary gear outer ring gear;
• an output shaft, wherein the output shaft is connected to the rear planetary gear planet carrier;
• a mechanical continuously variable transmission, wherein the mechanical continuously variable transmission comprises a cup wheel and ring disc transmission mechanism, a cup wheel and ring disc input shaft, and a cup wheel and ring disc output shaft the cup wheel and ring disc input shaft is gear-connected to the transmission shaft and the front planetary gear planet carrier, a third clutch (L3) is arranged between the cup wheel and ring disc input shaft and the transmission shaft, a fourth clutch (L4) is arranged between the cup wheel and ring disc input shaft and the front planetary gear planet carrier, and the cup wheel and ring disc output shaft is gear-connected to the rear planetary gear outer ring gear,
• wherein the cup wheel and ring disc transmission mechanism comprises a front cup wheel and ring disc transmission mechanism and a rear cup wheel and ring disc transmission mechanism, wherein the front cup wheel and ring disc transmission mechanism and the rear cup wheel and ring disc transmission mechanism are connected in series,
• wherein single transmission modes and hybrid transmission modes are implemented through combination and engagement/disengagement of the brakes and the clutches, wherein the single transmission modes comprise a hydraulic transmission mode, a mechanical constant-speed transmission mode, and a mechanical continuously variable transmission mode;
• the hybrid transmission modes comprise a mechanical constant-speed and hydraulic hybrid transmission mode, mechanical constant-speed and mechanical variable-speed hybrid transmission modes, and hydraulic and mechanical variable-speed hybrid transmission modes, and
• wherein the single transmission modes are controlled by the following methods:
• in the hydraulic transmission mode, engaging the second clutch (L2), the first brake (B1), and the third brake (B3) while disengaging the first clutch (L1), the third clutch (L3), the fourth clutch (L4), and the second brake (B2), so that power passes through the input shaft, the intermediate gear, the transmission shaft, the second clutch (L2), and the variable displacement pump driving gear pair to drive the variable displacement pump to work:
• the variable displacement pump outputs high-pressure oil to drive the fixed displacement motor to rotate:
• the power output from an output shaft of the fixed displacement motor passes through the front planetary gear outer ring gear, the front planetary gear planet carrier, the rear planetary gear sun gear, and the rear planetary gear planet carrier and is output from the output shaft;
• in the mechanical constant-speed transmission mode, engaging the first clutch (L1), the first brake (B1), and the second brake (B2) while disengaging the second clutch (L2), the third clutch (L3), the fourth clutch (L4), and the third brake (B3), so that power is input from the input shaft, then sequentially passes through the first clutch (L1), the front planetary gear sun gear, the front planetary gear planet carrier, the rear planetary gear sun gear, and the rear planetary gear planet carrier, and is output from the output shaft;
• in the mechanical continuously variable transmission mode, engaging the third clutch (L3), the second brake (B2), and the third brake (B3) while disengaging the first clutch (L1), the second clutch (L2), the fourth clutch (L2) and the first brake (B1), so that power passes through the input shaft, the intermediate gear, the transmission shaft, the third clutch (L3), the cup wheel and ring disc input shaft, the cup wheel and ring disc transmission mechanism, the cup wheel and ring disc output shaft, the rear planetary gear outer ring gear, and the rear planetary gear planet carrier and is output from the output shaft.