关键词: 自动变速箱；液压系统；压力特性；泄漏量；阀体性能

Abstract: As the core parts of automatic transmission, the performance of the valve body directly affects the driving quality of the car. Taking GF6 automatic transmission hydraulic system as an example, this paper introduces the calculation method of two performance indexes of valve body pressure and leakage in detail, and explains how to use these two performance indexes to analyze common problems of transmission hydraulic system through actual fault cases. This paper provides guidance and reference for valve body design and valve body fault analysis of automatic transmission.

Key words: Automatic transmission; Hydraulic system; Pressure characteristics; Leakage; Performance of valve body