Patent ID: 6024200
Filing Date: 2000-02-15
Classification: F15B,F16H,Y10T

Abstract:
In a hydraulic control circuit of an automatic vehicle transmission, a neutral-to-reverse control valve, comprising:a valve body having a first port for receiving hydraulic pressure from a manually operated valve in the circuit, a second port for receiving hydraulic pressure from a reducing valve in the circuit, and a third port in hydraulic communication with a friction element in the transmission at least partly by way of a first line;a valve spool movably disposed in said valve body and having a first and second end, said valve spool including a first land arranged so as to selectively communicate said first and third ports, a second land upon which the hydraulic pressure supplied to said second port is applied so as to bias said valve spool in a first direction whereby said first land communicates said first and third ports, and a third land provided intermediate said first and second lands and including a passage formed therethrough communicating opposing sides of said third land.