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

Patent metadata

Field	Value
Publication number	US-12209646-B2
Application number	US-202218023742-A
Country	US
Kind code	B2
Filing date	Feb 23, 2022
Priority date	Feb 11, 2022
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

A hybrid transmission device with a mechanical continuously variable transmission and a control method thereof are provided. The device includes an input shaft assembly, a front planetary gear transmission assembly, a rear planetary gear transmission assembly, an output shaft, and a mechanical continuously variable transmission. Single transmission modes and hybrid transmission modes are implemented through combination and engagement/disengagement of brakes and clutches. The device and the method realize free switching among various transmission modes and integrates the single transmission modes and the hybrid transmission modes, thereby increasing the degree of freedom in adjustment and expanding the speed regulation range. Input and output shafts of a front cup wheel and ring disc transmission mechanism and a rear cup wheel and ring disc transmission mechanism are coaxial, so that the structure is compact and intermediate rollers can stably and reliably transmit large torque.

First claim

What is claimed is:

1. 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 (L 1 ), 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 (L 2 ), and a variable displacement pump driving gear pair; the variable displacement pump is connected to the transmission shaft sequentially through the second clutch (L 2 ) 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 gear sun gear, a third brake (B 3 ), and a second brake (B 2 ); the third brake (B 3 ) 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 (L 1 ), the second brake (B 2 ) 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 (B 1 ); the rear planetary gear sun gear is connected to the front planetary gear planet carrier, and the first brake (B 1 ) 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 (L 3 ) is arranged between the cup wheel and ring disc input shaft and the transmission shaft, a fourth clutch (L 4 ) 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 single transmission modes are controlled by the following methods:
in the hydraulic transmission mode, engaging the second clutch (L 2 ), the first brake (B 1 ), and the third brake (B 3 ) while disengaging the first clutch (L 1 ), the third clutch (L 3 ), the fourth clutch (L 4 ), and the second brake (B 2 ), so that power passes through the input shaft the intermediate gear, the transmission shaft, the second clutch (L 2 ), 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 (L 1 ) the first brake (B 1 ), and the second brake (B 2 ) while disengaging the second clutch (L 2 ), the third clutch (L 3 ) the fourth clutch (L 4 ), and the third brake (B 3 ), so that power is input from the input shaft, then sequentially passes through the first clutch (L 1 ), 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 (L 3 ), the second brake (B 2 ), and the third brake (B 3 ) while disengaging the first clutch (L 1 ), the second clutch (L 2 ), the fourth clutch (L 4 ), and the first brake (B 1 ), so that power passes through the input shaft, the intermediate gear, the transmission shaft, the third clutch (L 3 ) 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.

2. The hybrid transmission device with the mechanical continuously variable transmission according to claim 1 , 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.

3. The control method of the hybrid transmission device with the mechanical continuously variable transmission according to claim 1 , wherein transmission ratios of the single transmission modes are calculated by the following methods:
the transmission ratio n 0 /n i in the hydraulic transmission mode being:

eK
1

i
1

⁢

i
2

⁢

i
3

⁢

i
4

(

1
+

K
1

)

⁢

(

1
+

K
2

)

wherein n 0 is a rotation speed of the output shaft, n i is a rotation speed of the input shaft, i 1 is a transmission ratio of the input shaft and the intermediate gear, i 2 is a transmission ratio of the intermediate gear and the transmission shaft, i 3 is a transmission ratio of the variable displacement pump driving gear pair, i 4 is a transmission ratio of the front planetary gear outer ring gear and the output end of the fixed displacement motor, K 1 is a planetary gear characteristic parameter of the front planetary gear transmission assembly, K 2 is a planetary gear characteristic parameter of the rear planetary gear transmission assembly, and e is a displacement ratio of the hydraulic transmission assembly;
the t

Assignees

• Univ Jiangsu

Inventors

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

Classifications

• F16H2200/2048

  with seven engaging means · CPC title

• F16H2200/2007

  with two sets of orbital gears · CPC title

• F16H61/66

  specially adapted for continuously variable gearings (control of exclusively fluid gearing F16H61/38) · CPC title

• F16H47/04 Primary

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

• F16H37/0853 Primary

  CVT using friction between rotary members having a first member of uniform effective diameter cooperating with different parts of a second member · CPC title