Internal type electronically controlled valve assembly and electronically controlled damper including the same

An internal type electronically controlled valve assembly, comprising:

• an outer housing that is configured to move up and down inside a cylinder and partitions the cylinder into an upper chamber and a lower chamber;
• a solenoid valve at a top of an inner space of the outer housing;
• an inner housing disposed below the solenoid valve inside the outer housing to form a main flow passage through which the upper chamber and the lower chamber of the cylinder communicate with each other;
• a main poppet disposed movably up and down inside the inner housing to open and close the main flow passage, the main poppet including a pilot passage;
• a pilot poppet having at least a lower half portion accommodated in an upper part of the main poppet, the pilot poppet being configured to adjust an opening force of the main flow passage based on a control current applied to the solenoid valve;
• a main sheet having a hollow hole at a center of the main sheet, the main sheet being coupled to an open lower end of the inner housing to limit a downward movement of the main poppet;
• a control disk having a ring shape and disposed horizontally above the main sheet;
• and
• a main poppet retainer having a disc shape with a rim protruding downward and disposed horizontally between the main poppet and the control disk,
• wherein, the internal type electronically controlled valve assembly is configured such that, during a compression stroke, a working fluid introduced through the hollow hole of the main sheet passes between the control disk and the main poppet retainer, reducing the pressure, and then flows into the pilot passage in the main poppet, and
• wherein a central region of a bottom surface of the main poppet is in direct contact with a top surface of the main poppet retainer, and a peripheral region of the bottom surface of the main poppet is free of contact with the top surface of the main poppet retainer.