| 摘要 |
PURPOSE: To eliminate instability of a valve device due to pump internal pressure fluctuation by applying solenoid pressure to a throttle valve from a pilot valve in response to the solenoid generating force according to the operational variation of a transmission to output the regulated control pressure. CONSTITUTION: In a solenoid main body 170, a valve seat 188 is opened by a pilot valve element 186 with solenoid force according to the operational variation of a transmission and the force of a spring 189, and the solenoid pressure is supplied from a connecting hole 194a groove chamber 206 for a throttle valve spool 200 to be further connected to a supply passage 190 for a servo pilot valve. The pressure from a pump is supplied to a valve chest 196 from a line pressure passage 208, the supply of line pressure to a throttle valve pressure passage 212 is shut off by the operation against a spring 209 of the spool 200, and the throttle valve pressure is discharged to a discharge hole 210. The throttle valve pressure is fed back through a stabilizing hole 214 to vary the capacity of a clutch and brake servo mechanism by the throttle valve pressure according to the exciting rate of the solenoid main body 170. |
