| 摘要 |
PURPOSE: A manual valve of a hydraulic control system of an automatic transmission for a car is provided to prevent the damage of a friction element and a lowering of oscillation performance, and to gauge the quantity of oil of a transmission in "P" range by supplying hydraulic pressure with controlling line-pressure in "P" or "N" range for making sufficiently lubricating hydraulic pressure. CONSTITUTION: A manual valve of a hydraulic control system of an automatic transmission for a car comprises : a valve body to include the first port(100) connected with a line-pressure pipe, the second port(102) of "P" or "N" range, the third port(104) of "D" range, the fourth port(106) of "2" range, the fifth port(108) of "L" range, the sixth port(110) of "R" range, and the first and the second discharge ports(EX1, EX2) ; a valve spool(112) to convert the ports, and to include a connect port(114), the first land(116), the second and the third lands(118)(120) connecting the first port(100) with the second port(102), the fourth land(122) connecting the first port(100) with the sixth port(110) and connecting the first port(100) with the second in order, the third, the fourth, and the fifth port in "N", "D", "2", or "L" range, and the first and the second hole for removing the left pressure(124) discharging the left pressure of between the second land(116) and the third land(120), and between the first land(116) and the second land(118). And all diameter of the lands of a valve spool(112) are equal.
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