Power-split hydro-mechanical hybrid transmission system with automatic adjustment function

Patent metadata

Field	Value
Publication number	US-11313447-B1
Application number	US-202017430733-A
Country	US
Kind code	B1
Filing date	Aug 4, 2020
Priority date	Jul 20, 2020
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A power-split hydro-mechanical hybrid transmission system with an automatic adjustment function includes an input member, a hydraulic transmission mechanism, a split mechanism, a convergence mechanism, an output member, a clutch assembly, and a brake assembly. The clutch assembly connects the input member to an input end of the split mechanism, connects an output end of the split mechanism to an input end of the hydraulic transmission mechanism and an input end of the convergence mechanism, and connects an output end of the hydraulic transmission mechanism to the output member. An output end of the convergence mechanism is connected to the output member. The clutch assembly and the brake assembly provide a continuous transmission ratio between the input member and the output member. The power-split hydro-mechanical hybrid transmission system enables multi-mode continuously variable transmission and has energy reuse and emergency support functions.

First claim

What is claimed is:

1. A power-split hydro-mechanical hybrid transmission system with an automatic adjustment function, comprising an input member, a hydraulic transmission mechanism, a split mechanism, a convergence mechanism, an output member, a clutch assembly, and a brake assembly, wherein the clutch assembly connects the input member to an input end of the split mechanism, connects an output end of the split mechanism to an input end of the hydraulic transmission mechanism and an input end of the convergence mechanism, and connects an output end of the hydraulic transmission mechanism to the output member; an output end of the convergence mechanism is connected to the output member; and the clutch assembly and the brake assembly provide a continuous transmission ratio between the input member and the output member;
transmission modes comprising hydraulic transmission, hydro-mechanical transmission, and mechanical transmission are provided between the input member and the output member by adjusting a displacement ratio of the hydraulic transmission mechanism and selectively controlling engagement of the clutch assembly and the brake assembly;
the split mechanism comprises a split mechanism-ring gear, a split mechanism-planet carrier, and a split mechanism-sun gear, wherein the split mechanism-ring gear is connected to the input member;
the convergence mechanism comprises a convergence mechanism-common ring gear, a convergence mechanism-small sun gear, a convergence mechanism-large sun gear, a convergence mechanism-short planet carrier, and a convergence mechanism-long planet carrier, wherein the convergence mechanism-short planet carrier is connected to the convergence mechanism-long planet carrier, and the convergence mechanism-long planet carrier is connected to the output member; the convergence mechanism-common ring gear, the convergence mechanism-small sun gear, and the convergence mechanism-short planet carrier form a planetary gear train, while the convergence mechanism-common ring gear, the convergence mechanism-large sun near, and the convergence mechanism-long planet carrier form another planetary gear train;
the clutch assembly comprises a clutch C 1 and a clutch C 2 , wherein the clutch C 1 is used for selectively connecting the split mechanism-sun gear to the input end of the hydraulic transmission mechanism to achieve synchronous rotation, and the clutch C 2 is used for selectively connecting the output end of the hydraulic transmission mechanism to the output member to achieve synchronous rotation; the brake assembly comprises a brake B 1 , wherein the brake B 1 is used for selectively connecting the split mechanism-planet carrier to a fixed member;
the clutch C 1 , the clutch C 2 , and the brake B 1 are engaged to provide forward or reverse hydraulic transmission between the input member and the output member.

2. The power-split hydro-mechanical hybrid transmission system with the automatic adjustment function according to claim 1 , wherein the clutch assembly further comprises a clutch C 3 , a clutch C 4 , and a clutch C 5 , wherein the clutch C 3 is used for selectively connecting the split mechanism-planet carrier to the convergence mechanism-large sun gear to achieve synchronous rotation, the clutch C 4 is used for selectively connecting the convergence mechanism-small sun gear to the convergence mechanism-large sun gear to achieve synchronous rotation, and the clutch C 5 is used for selectively connecting the split mechanism-ring gear to the split mechanism-planet carrier to achieve synchronous rotation; the brake assembly further comprises a brake B 2 and a brake B 3 , wherein the brake B 2 is used for selectively connecting the convergence mechanism-small sun gear to a fixed member, and the brake B 3 is used for selectively connecting the convergence mechanism-common ring gear to a fixed member;
the clutch C 3 , the clutch C 5 , and the brake B 3 are engaged to provide reverse mechanical transmission between the input member and the output member; the clutch C 3 , the clutch C 5 , and the brake B 2 are engaged or the clutch C 3 , the clutch C 4 , and the clutch C 5 are engaged to provide different forward mechanical transmissions between the input member and the output member.

3. The power-split hydro-mechanical hybrid transmission system with the automatic adjustment function according to claim 2 , wherein the clutch C 1 , the clutch C 2 , the clutch C 3 , and the brake B 3 are engaged to provide reverse hydro-mechanical transmission between the input member and the output member;
the clutch C 1 , the clutch C 2 , the clutch C 3 , and the brake B 2 are engaged or the clutch C 1 , the clutch C 2 , the clutch C 3 , and the clutch C 4 are engaged to provide different forward hydro-mechanical transmissions between the input member and the output member.

4. The power-split hydro-mechanical hybrid transmission system with the automatic adjustment function according to claim 1 , wherein the hydraulic transmission mechanism comprises a variable displacement pump, an oil replenishing system, a solenoid directional valve V 3 , a proportional throttle valve V 8 a safety valve group, a three-position four-way proportional directional valve V 9 , a high-pressure accumulator A 1 , a low-pressure accumulator A 2 , an emergency valve V 10 , and a pump/motor mechanism, wherein an input end of the variable displacement pump is connected to the output end of the split mechanism through the clutch C 1 , an output end of the pump/motor mechanism is connected to the output member through the clutch C 2 , the variable displacement pump is used for driving the pump/motor mechanism, the solenoid directional valve V 3 for one-way flow of oil is disposed on a high-pressure hydraulic pipe between an oil outlet of the variable displacement pump and an oil inlet of the pump/motor mechanism; the proportional throttle valve V 8 is disposed on a low-pressure hydraulic pipe between an oil inlet of the variable displacement pump and an oil outlet of the pump/motor mechanism; the proportional directional valve V 9 is connected in parallel between the low-pressure hydraulic pipe and the high-pressure hydraulic pipe; the high-pressure accumulator A 1 and the low-pressure accumulator A 2 are both connected to the proportional directional valve V 9 ;
the low-pressure hydraulic pipe and the high-pressure hydraulic pipe share the safety valve group for pressure adjustment of the pipes; the oil replenishing system is used for replenishing hydraulic oil in the low-pressure hydraulic pipe and/or the high-pressure hydraulic pipe.

5. The power-split hydro-mechanical hybrid transmission system with the automatic adjustment function according to claim 4 , wherein when the output member decelerates, the clutch C 2 is engaged, and braking energy of the output member is transmitted to the pump/motor mechanism; the pump/motor mechanism works as a hydraulic pump; the solenoid directional valve V 3 is controlled to be powered on, preventing the oil from flowing back to the variable displacement pump; the proportional throttle valve V 8 is controlled to reduce port opening, thereby increasing pressure at the oil outlet of the pump/motor mechanism; the proportional directional valve V 9 is controlled to make the low-pressure accumulator A 2 communicated with the oil inlet of the pump/motor mechanism to replenish oil; and the proportional directional valve V 9 is controlled to make the high-pressure accumulator A 1 communicated with the oil outlet of the pump/motor mechanism to store energy.

6. The power-split hydro-mechanical hybrid transmission system with the automatic adjustment function according to claim 4 , wherein when the output member accelerates, the pump/motor mechanism works as a hydraulic pump; the

Assignees

• Univ Jiangsu

Inventors

• Zhu Zhen
• Cai Yingfeng
• Chen Long
• Wang Juncheng
• Xia Changgao
• Han Jiangyi
• Xu Xing
• Shi Dehua
• Dou Lei
• Wang Jiajia

Classifications

• 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

• F16H47/04 Primary

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

• F16H33/00 Primary

  Gearings based on repeated accumulation and delivery of energy · CPC title

• F16H2037/088

  Power-split transmissions with summing differentials, with the input of the CVT connected or connectable to the input shaft · CPC title

• F16H2200/2051

  with eight engaging means · CPC title