| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the necessity of making individual spool adjustments of a plurality of valves in both a normal case and an abnormal case. SOLUTION: A line pressure is adjusted by one and the same valve even in both a normal case and a failure case, and a control hydraulic pressure is fed into a clutch. In the normal case, a clutch pressure control valve 42 is controlled with the use of a valve control hydraulic pressure which is controlled by a start clutch control valve 41 so as to adjust the line pressure in a pipe line 61b in order to control the operation of a clutch 5. In a failure case, two electric control valves 41, 45 are turned off, and at this time, the line pressure is effected in a pipe line 64. As a result, a spool in a clutch regulating valve 43 is moved leftward so that hydraulic oil is fed into a Pitot flange 51, and accordingly, a hydraulic pressure as a signal pressure corresponding to a speed of an engine (corresponding hydraulic pressure) is fed into the clutch pressure control valve 43 through pipe lines 66, 67 from a Pitot pipe 53. Thus, the line pressure in the pipe line 61 is adjusted by this corresponding pressure in order to control the clutch 5.
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