Damping pressure supply circuit for pulley pressure control valve

A damping pressure supply circuit for a pulley pressure control valve, comprising:

• a pressure regulator valve that regulates a pressure of oil discharged from an oil pump to a line pressure;
• a first pilot valve that generates a first pilot pressure with the line pressure as a source pressure;
• a second pilot valve that generates a second pilot pressure with the first pilot pressure as a source pressure;
• and
• a third pilot valve that generates a third pilot pressure with the second pilot pressure as a source pressure, wherein
• the first pilot pressure is introduced as a source pressure into a primary solenoid valve that generates a primary signal pressure that is a signal pressure for controlling a primary pulley pressure in a belt continuously variable transmission and a secondary solenoid valve that generates a secondary signal pressure that is a signal pressure for controlling a secondary pulley pressure in the belt continuously variable transmission,
• the second pilot pressure is introduced as a source pressure into a lock-up solenoid valve that generates a signal pressure for controlling a lock-up pressure in a lock-up clutch of a torque converter, and
• the third pilot pressure is introduced as a damping pressure into a primary pulley pressure control valve that controls the primary pulley pressure according to the primary signal pressure and a secondary pulley pressure control valve that controls the secondary pulley pressure according to the secondary signal pressure.