| 摘要 |
PURPOSE:To ensure forward running by supplying oil pressure from a fail-safe port in No.2 clutch oil pressure exhaust position of No.2 shift valve when No.1 shift valve is stuck in the oil pressure exhaust position of No.1 input clutch. CONSTITUTION:When a spool valve 272 of a 3-4 shift valve 270 is stuck in No.1 changeover position, a clutch port 282 continues in communication with a drain port 280, and no oil pressure is supplied from a D-port 274. When a manual shift valve is changed over from N to D, a spool valve 242 and a plug 244 of 2-3 shift valve 240 are in NO.1 changeover position, and a D-port 246 is put in communication with a fail-safe port 260, and the lien oil pressure this D-port 246 is supplied to No.1 clutch C1 via the port 260, oil paths 268, 269, and ports 280, 282 so as to generate engagement, and No.1 speed position is provided. Thus forward running of the car is secured even though otherwise required speed change control is omitted. |
