Hydro-mechanical series and parallel transmission device and control method thereof

Patent metadata

Field	Value
Publication number	US-12234909-B2
Application number	US-202218276264-A
Country	US
Kind code	B2
Filing date	Feb 23, 2022
Priority date	Feb 17, 2022
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A hydro-mechanical series and parallel transmission device and a control method thereof are provided. The device includes an input shaft assembly, a hydraulic transmission assembly, a planetary gear transmission assembly, an intermediate gear transmission assembly, and an output shaft assembly. Switching among a hydraulic transmission mode, a mechanical transmission mode, and a hydro-mechanical composite transmission mode is implemented through combination and engagement/disengagement of clutches and brakes. The hydro-mechanical series transmission is used to expand the speed regulation range of the hydraulic transmission and is combined with the hydraulic transmission to meet the requirements on precision and the speed regulation range. The requirements of low-power and high-power operations are met through combination of the hydro-mechanical series and parallel transmissions. Multiple transmission modes are formed to adapt to the working conditions of startup, operation, and transfer.

First claim

What is claimed is:

1. A hydro-mechanical series and parallel transmission device, characterized by comprising:
an input shaft assembly ( 1 ), wherein the input shaft assembly ( 1 ) comprises an input shaft ( 11 ), a first clutch C 1 ( 12 ), a linked intermediate gear set ( 13 ), and a fifth clutch C 5 ( 14 );
a hydraulic transmission assembly ( 2 ), wherein the hydraulic transmission assembly ( 2 ) comprises a variable displacement pump ( 21 ), a fixed displacement motor ( 22 ), and a second clutch C 2 ( 23 ), and the variable displacement pump ( 21 ) is connected to the input shaft ( 11 ) through the second clutch C 2 ( 23 );
a planetary gear transmission assembly ( 3 ), wherein the planetary gear transmission assembly ( 3 ) comprises an outer ring gear ( 31 ), a planet carrier ( 32 ), a sun gear ( 33 ), and a sixth clutch C 6 ( 34 ), the sixth clutch C 6 ( 34 ) is connected to the sun gear ( 33 ), and the fifth clutch C 5 ( 14 ) is connected to the outer ring gear ( 31 );
an intermediate gear transmission assembly ( 4 ), wherein the intermediate gear transmission assembly ( 4 ) comprises a first transmission gear ( 41 ), a second transmission gear ( 42 ), a third transmission gear ( 43 ), a fourth transmission gear ( 44 ), a third clutch C 3 ( 45 ), a fourth clutch C 4 ( 46 ), and a brake B 1 ( 47 ), the first transmission gear ( 41 ) is fixedly connected to an output shaft of the fixed displacement motor ( 22 ), the first transmission gear ( 41 ) meshes with the second transmission gear ( 42 ), the second transmission gear ( 42 ) is connected to the third transmission gear ( 43 ) through the fourth clutch C 4 ( 46 ), the third transmission gear ( 43 ) meshes with the fourth transmission gear ( 44 ), the fourth transmission gear ( 44 ) is connected to the sun gear ( 33 ) and the brake B 1 ( 47 ), the output shaft of the fixed displacement motor ( 22 ) is connected to the linked intermediate gear set ( 13 ) through the third clutch C 3 ( 45 ) and the fifth clutch C 5 ( 14 ), and the output shaft of the fixed displacement motor ( 22 ) is connected to the sun gear ( 33 ) through the third clutch C 4 ( 45 ) and the sixth clutch C 6 ( 34 );
an output shaft assembly ( 5 ), wherein the output shaft assembly ( 5 ) comprises an output shaft ( 51 ) and an intermediate gear ( 52 ), and the output shaft ( 51 ) is connected to the planet carrier ( 32 ) through the intermediate gear ( 52 ).

2. A control method of the hydro-mechanical series and parallel transmission device according to claim 1 , characterized in that switching among a hydraulic transmission mode, a mechanical transmission mode, and a hydro-mechanical composite transmission mode is implemented through combination and engagement/disengagement of the clutches and the brakes.

3. The control method of the hydro-mechanical series and parallel transmission device according to claim 2 , characterized in that the hydro-mechanical composite transmission mode comprises a hydro-mechanical series transmission mode and a hydro-mechanical parallel transmission mode.

4. The control method of the hydro-mechanical series and parallel transmission device according to claim 3 , characterized in that the hydro-mechanical series transmission mode and the hydro-mechanical parallel transmission mode are controlled by the following methods:
in the hydro-mechanical series transmission mode, engaging the second clutch C 2 ( 23 ), the fourth clutch C 4 ( 46 ), and the sixth clutch C 6 ( 34 ) while disengaging the first clutch C 1 ( 12 ), the third clutch C 3 ( 45 ), the fifth clutch C 5 ( 14 ), and the brake B 1 ( 47 ), so that power is input from the input shaft ( 11 ) and then passes through the second clutch C 2 ( 23 ) to drive the variable displacement pump ( 21 ) to work; the variable displacement pump ( 21 ) outputs high-pressure oil to drive the fixed displacement motor ( 22 ) to rotate; the power output from the output shaft of the fixed displacement motor ( 22 ) sequentially passes through the first transmission gear ( 41 ), the second transmission gear ( 42 ), the fourth clutch C 4 ( 46 ), the third transmission gear ( 43 ), the fourth transmission gear ( 44 ), the sun gear ( 33 ), the planet carrier ( 32 ), and the intermediate gear ( 52 ) and is output from the output shaft ( 51 );
in the hydro-mechanical parallel transmission mode, engaging the first clutch C 1 ( 12 ), the second clutch C 2 ( 23 ), the fourth clutch C 4 ( 46 ), and the fifth clutch C 5 ( 14 ) while disengaging the third clutch C 3 ( 45 ), the sixth clutch C 6 ( 34 ), and the brake B 1 ( 47 ), so that power enters the input shaft assembly ( 1 ) and is split into two parts; one part of the power is input from the input shaft ( 11 ) and then passes through the second clutch C 2 ( 23 ) to drive the variable displacement pump ( 21 ) to work; the variable displacement pump ( 21 ) outputs high-pressure oil to drive the fixed displacement motor ( 22 ) to rotate; the power output from the output shaft of the fixed displacement motor ( 22 ) sequentially passes through the first transmission gear ( 41 ), the second transmission gear ( 42 ), the fourth clutch C 4 ( 46 ), the third transmission gear ( 43 ), the fourth transmission gear ( 44 ), and the sun gear ( 33 ) to the planet carrier ( 32 ); the other part of the power sequentially passes through the first clutch C 1 ( 12 ), the linked intermediate gear set ( 13 ), the fifth clutch C 5 ( 14 ), and the outer ring gear ( 31 ) and is converged with the power passing through the hydraulic transmission assembly ( 2 ) and the intermediate gear transmission assembly ( 4 ) at the planet carrier ( 32 ); the power after convergence passes through the planet carrier ( 32 ) and the intermediate gear ( 52 ) and is output from the output shaft ( 51 ).

5. The control method of the hydro-mechanical series and parallel transmission device according to claim 4 , characterized in that the rotation speed n o of the output shaft ( 51 ) in the hydro-mechanical series transmission mode and the hydro-mechanical parallel transmission mode is calculated by the following methods:
in the hydro-mechanical series transmission mode,

n
o

=

e

i
3

⁢

i
4

⁢

i
5

⁢

i
6

⁢

n
I

wherein n o is the rotation speed of the output shaft ( 51 ), n I is the rotation speed of the input shaft ( 11 ), i 3 is the transmission ratio of the first transmission gear ( 41 ) and the second transmission gear ( 42 ), i 4 is the transmission ratio of the third transmission gear ( 43 ) and the fourth transmission gear ( 44 ), i 5 is the transmission ratio of the outer ring gear ( 31 ) and the intermediate gear ( 52 ), and i 6 is the transmission ratio of the intermediate gear ( 52 ) and the output shaft ( 51 );
in the hydro-mechanical parallel transmission mode,

n
o

=

Assignees

• Univ Jiangsu

Inventors

• Zhu Zhen
• Zhang Yihan
• Cai Yingfeng
• Chen Long
• Xia Changgao
• Sun Xiaodong
• Tian Xiang
• Hou Rui
• Sheng Jie

Classifications

• F16H2200/2005

  with one sets of orbital gears · CPC title

• F16H2200/0039

  the gear ratios comprising three forward speeds · CPC title

• F16H2061/009

  using formulas or mathematic relations for calculating parameters · CPC title

• F16H47/04 Primary

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

• G06F17/10

  Complex mathematical operations {(function generation by table look-up G06F1/03; evaluation of elementary functions by calculation G06F7/544)} · CPC title