Mechanical-electrical-hydraulic hybrid transmission device and control method thereof

Patent metadata

Field	Value
Publication number	US-12379026-B2
Application number	US-202218277229-A
Country	US
Kind code	B2
Filing date	Jun 9, 2022
Priority date	Jun 7, 2022
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A mechanical-electrical-hydraulic composite transmission device and a control method thereof are provided. The device includes an input shaft assembly, a power-split assembly, a hydraulic transmission assembly, an electrical variable transmission assembly, a mechanical transmission assembly, a power-convergence assembly, and an output shaft. Three types of transmission modes including single transmission modes, power-split composite transmission modes, and power-convergence composite transmission modes are implemented by controlling engagement and disengagement of clutches and a brake. Free switching between various transmission modes is realized, the requirements of engineering machinery for a transmission device with multiple modes in different working conditions are satisfied, the engine power utilization is improved, and the fuel economy is increased. The shift impact is effectively reduced and the speed ratio adjustment range is expanded. The hydraulic transmission enables quick startup and stable operation and implements speed variation and direction change easily and rapidly without causing impact.

First claim

What is claimed is:

1. A mechanical-electrical-hydraulic composite transmission device, comprising:
an input shaft assembly comprising an input shaft and a first clutch;
a power-split assembly comprising a power-split assembly input shaft, a first gear pair, a second clutch, a power-split assembly ring gear, a power-split assembly planet carrier, and a power-split assembly sun gear, wherein the power-split assembly ring gear is connected to the power-split assembly input shaft, the power-split assembly input shaft is connected to the input shaft through the first clutch, and the power-split assembly ring gear is connected to the power-split assembly planet carrier through the second clutch;
a hydraulic transmission assembly comprising a third clutch, a variable displacement pump, a hydraulic pipe, a fixed displacement motor, a second gear pair, and a fourth clutch, wherein an input end of the hydraulic transmission assembly is connected to the power-split assembly sun gear, the input end of the hydraulic transmission assembly is connected to the variable displacement pump through the third clutch, the variable displacement pump outputs high-pressure oil to the fixed displacement motor through the hydraulic pipe, and the second gear pair is connected to an output shaft of the fixed displacement motor through the fourth clutch;
an electrical variable transmission assembly comprising a fifth clutch, a third gear pair, an electrical variable transmission input shaft, an electrical variable transmission, and an electrical variable transmission output shaft, wherein the power-split assembly planet carrier is connected to the electrical variable transmission input shaft through the fifth clutch;
a mechanical transmission assembly comprising a fourth gear pair, a sixth clutch, a brake, a mechanical transmission assembly input shaft, a fifth gear pair, a seventh clutch, a mechanical transmission assembly ring gear, a mechanical transmission assembly sun gear, an eighth clutch, a mechanical transmission assembly planet carrier, and a mechanical transmission assembly output shaft, wherein the electrical variable transmission output shaft is connected to the mechanical transmission assembly sun gear through the sixth clutch, the brake is connected to the mechanical transmission assembly sun gear, the power-split assembly planet carrier is connected to the mechanical transmission assembly ring gear through the seventh clutch, and the mechanical transmission assembly sun gear is connected to the mechanical transmission assembly planet carrier through the eighth clutch;
a power-convergence assembly comprising a power-convergence assembly ring gear, a power-convergence assembly sun gear, a power-convergence assembly planet carrier, and a ninth clutch, wherein the power-convergence assembly ring gear is fixedly connected to the mechanical transmission assembly output shaft, the power-convergence assembly ring gear is connected to the power-convergence assembly planet carrier through the ninth clutch, and the power-convergence assembly sun gear is connected to an output end of the hydraulic transmission assembly; and
an output shaft, wherein the output shaft is connected to the power-convergence assembly planet carrier.

2. A control method of the mechanical-electrical-hydraulic composite transmission device according to claim 1 , wherein three types of transmission modes comprising single transmission modes, power-split composite transmission modes, and power-convergence composite transmission modes are implemented by controlling engagement and disengagement of the clutches and the brake, wherein the single transmission modes comprise a hydraulic transmission mode, a mechanical transmission mode, and an electrical variable transmission mode; the power-split composite transmission modes comprise a hydraulic-mechanical split transmission mode, a hydraulic-electrical split transmission mode, and a hydraulic-mechanical-electrical split transmission mode; and the power-convergence composite transmission modes comprise a mechanical-electrical convergence transmission mode, a hydraulic-mechanical convergence transmission mode, a hydraulic-electrical convergence transmission mode, and a mechanical-hydraulic-electrical convergence transmission mode.

3. The control method of the mechanical-electrical-hydraulic composite transmission device according to claim 2 , wherein the single transmission modes are controlled by the following methods:
in the hydraulic transmission mode, engaging the first clutch, the second clutch, the third clutch, the fourth clutch, and the ninth clutch while disengaging the fifth clutch, the sixth clutch, the seventh clutch, the eighth clutch, and the brake, so that power is input from the input shaft and then passes through the first 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, and the power output from an output end of the fixed displacement motor is transmitted through the second gear pair and then output from the output shaft;
in the mechanical transmission mode, engaging the first clutch, the second clutch, the seventh clutch, the ninth clutch, and the brake while disengaging the third clutch, the fourth clutch, the fifth clutch, the sixth clutch, and the eighth clutch, so that power is input from the input shaft and then sequentially passes through the first clutch, the second clutch, and the seventh clutch to drive the mechanical transmission assembly ring gear to work, and the power output from the mechanical transmission assembly ring gear is transmitted through the mechanical transmission assembly planet carrier and then output from the output shaft; and
in the electrical variable transmission mode, engaging the first clutch, the second clutch, the fifth clutch, the sixth clutch, the eighth clutch, and the ninth clutch while disengaging the third clutch, the fourth clutch, the seventh clutch, and the brake, wherein the power-split assembly and the power-convergence assembly are each fixedly connected as a whole, so that power is input from the input shaft, then transmitted through the power-split assembly, the electrical variable transmission assembly, and the power-convergence assembly, and output from the output shaft.

4. The control method of the mechanical-electrical-hydraulic composite transmission device according to claim 3 , wherein a rotation speed n o of the output shaft in the single transmission modes is calculated by the following methods:
in the hydraulic transmission mode:

n
o

=

e

i
1

⁢

i
2

⁢

n
I

wherein n o is the rotation speed of the output shaft, n 1 is a rotation speed of the input shaft, e is a displacement ratio of the hydraulic transmission assembly, i 1 is a transmission ratio of the first gear pair, and i 2 is a transmission ratio of the second gear pair;
in the mechanical transmission mode:

n
o

=

k
2

Assignees

• Univ Jiangsu

Inventors

• Zhu Zhen
• Sheng Jie
• Cai Yingfeng
• Chen Long
• Xia Changgao
• Jiang Haobin
• Tian Xiang
• Han Jiangyi
• Zhu Jianguo
• Zeng Falin

Classifications

• F16H61/686

  with orbital gears · CPC title

• F16H61/40

  hydrostatic · CPC title

• F16H61/00

  Control functions within {control units of} change-speed- or reversing-gearings for conveying rotary motion {; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing} · CPC title

• F16H59/40

  Output shaft speed · CPC title

• F16H47/04 Primary

  the mechanical gearing being of the type with members having orbital motion · CPC title