Patent ID: 6067795
Filing Date: 2000-05-30
Classification: F16H

Abstract:
A hydraulic continuously variable transmission for use on a vehicle, comprising a hydraulic pump and a hydraulic motor, at least one of which is a variable displacement type, said hydraulic pump which is driven by an engine delivering oil that actuates said hydraulic motor, which in turn drives the vehicle;said transmission further comprising:a hydraulic closed circuit which comprises a first oil passage connecting a port of said hydraulic pump with a port of said hydraulic motor and a second oil passage connecting another port of said hydraulic pump with another port of said hydraulic motor;first pressure controlling means, which controls pressure in said first oil passage;second pressure controlling means, which controls pressure in said second oil passage;brake operation detecting means, which detects operation of a brake; anddeceleration detecting means, which detects deceleration of the vehicle;wherein:when said brake operation detecting means detects the operation of the brake and said deceleration detecting means detects a deceleration of the vehicle which is greater than a predetermined value, either said first pressure controlling means or said second pressure controlling means lowers one of the pressures of said first oil passage and said second oil passage which has a higher pressure than the other oil passage to a predetermined pressure; said predetermined pressure being higher than the pressure of said other oil passage.