| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control device of a transmission for a vehicle having an inexpensive configuration that can supply a stable quantity of a lubricant to a lubrication region even if there occurs a valve stick.SOLUTION: A lubricant flow-rate switching valve 21 comprises: an input port 21b; an output port 21c communicating with an oil passage c1 that communicates with a lubrication circuit 50; a drain port 21d capable of discharging secondary pressure Pinputted to the input port 21b; a spool 21p; a spring 21s for energizing the spool 21p to one direction; and a working fluid chamber 21a for inputting SLT (linear solenoid valve) pressure Pthat presses the spool 21p to the another direction. Then, the output port 21c is formed into a shape having a prescribed opening area S in a small flow-rate state that is blocked to the utmost by a cylindrical land part 21pb of the spool 21p. The land part 21pb can be formed into a cylindrical shape, thereby, for example, even if there occurs valve stick, the output of a lubricant quantity from the prescribed opening area S is secured. |
