乘用车无级变速器液压系统设计

本科学生毕业设计

乘用车无级变速器液压系统设计

系部名称：汽车工程系

专业班级：车辆工程B05-18班

学生：高新明

指导教师：安永东

职称：副教授

黑龙江工程学院

二○○九年六月

The Graduation Thesis for Bachelor's Degree Passenger CVT hydraulic

system design

Candidate：Gao XinMing

Specialty：Vehicle Engineering

Class：B05-18

Supervisor：Associate Prof. An YongDong Heilongjiang Institute of Technology

2009-06·Harbin

摘要

液压控制系统是通过控制金属带轮的夹紧力来实现无级自动变速器速比调节的,其设计方法是开发无级变速传动系统的关键技术之一.在分析了金属带式无级变速器的结构特征和力学关系的基础上,通过对汽车典型行驶工况的仿真分析,提出了无级自动变速液压控制系统关键参数—速比变化率的设计方法,完成了液压系统的结构参数设计,并进行了仿真验证,从而为无级自动变速汽车的研制开发奠定了基础.

针对无级变速器电液控制系统的工作要求，应用数字比例控制技术设计了可用作无级变速器中夹紧力控制阀的数字调压阀。介绍了该数字调压阀的结构以及驱动器的设计方法，并对其进行了静态特性、动态特性试验。试验结果表明，该数字调压阀的控制精度及可靠性高，能满足金属带式无级变速器电液控制系统的要求。

关键词:无级变速传动；液压系统；无级变速器；电液控制系统；数字调压阀

ABSTRACT

The design method on the hydraulic control system is one of the key technologies of a metal V-belt continuously variable transmission(CVT).It can change the ratio of the transmission system by adjusting thepu-Shing force of the pulley.By analyzing the structure characteristics andForce relationgs,the design method of an important parameter of the CVTHydranlic system and the rate of transmission ratio are put forward by Simulation to the emblematical driving models. The structure parametersOf hydraulic system is gotten and validated by simulation on specific Driving model. An effective design method is provided to develop the co-ntinuously variable transmission system.

In terms of working requirements of the electric-hydraulic controlSystem of continuous variable transmissions,the ditital pressure regulator valve,which can be used as the clamping force valve of CVT,is designed with the digital proportional control technology .The st-Ructure of the digital pressure regulator valve and design method forDrivers is introduced. Tests of static characteristics and dynamic cha-racteristics of digital pressure regulator valve is high, it can meetrequirements of the electric-hydraulic control system of system of metalv-belt type continuous variable transmission.

Key words:Continuously variable transmission；Hydraulic system；

Electric-hydraulic control system；Digital pressure regulator valve

目录

摘要.............................................................................................................. I Abstract....................................................................................................... I I 第1章绪论.. (1)

1.1 课题背景研究目的及意义 (1)

1.2 乘用车无级变速器液压系统的发展历史和发展趋势 (2)

1.3 设计的主要工作 (3)

1.3.1主要设计容 (3)

1.3.2主要技术指标、要求 (4)

第2章乘用车无级变速器液压系统方案设计 (4)

2.1 液压系统概述 (5)

2.1.1 液压系统的组成和型式 (5)

2.1.2 液压系统的类型和特点 (5)

2.1.3 液压传动与控制的优缺点 (6)

2.2 液压系统设计 (6)

2.2.1 明确设计要求 (7)

2.2.2 总体规划、确定液压执行元件 (7)

2.2.3 确定系统的工作压力 (7)

2.2.4 方案选择 (7)

2.3 本章小结 (7)