| 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 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, the second and the third discharge ports(EX1, EX2, EX3) ; a valve spool(112) to convert the ports, and to include a connector(114), and to include a connect port(114), the first and the second lands(116)(118) connecting the first port(100) with the second port(102) in "P" range, the third land(120) connecting the first port(100) with the sixth port(110) in "R" range and connecting the first port(100) with the second, the third, the fourth or the fifth port(102)(104)(106)(108) in "N", "D", "2", or "r" range in order, the fourth land(122) breaking the second and the third discharge ports(EX2, EX3) in "P" and "R" range, and a hole for removing the left pressure(124) discharging the left pressure of between the first land(116) and the second land(118).And the diameters of the first, the second, and the third lands are equal, but that of the fourth land is smaller.
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