| 摘要 |
PURPOSE:To make a failsafe mechanism and an inhibit mechanism compatible while to retard reversing of speed changer even upon reversing of a manual valve under high speed travel. CONSTITUTION:Upon malfunction of electronic control, power is interrupted from first and second solenoid valves 60, 110 to enter into 4th speed shift condition. When shifting a manual valve 40 to 3rd speed, it will enter into same condition with 4th speed shift because there is no corresponding oil path. Upon shifting to 2nd speed range, a high pressure signal from an oil path 9 will function onto 3-4 shift valve 90 thus to enter into 3rd speed shift. While upon shifting to 1st speed range, an oil path 1 will communicated through a shuttle valve 180 with an oil path 10 to function a high pressure signal onto a safety valve B thus to achieve 1st speed shift. Upon shifting to reverse range, a high pressure signal from an oil path 12 will lift 3-4 shift valve 90 while lower 1-2 shift valve 70 thus to achieve reversing. |
