Patent ID: 9732819
Date: 2017-08-15
CPC Classifications: F16F

Claim:
1. An electronically controlled internal damper comprising: a main passage formed by a working fluid flowing through a main piston in which compression passages and rebound passages are alternately disposed; a pilot passage formed by the working fluid as much as a predetermined amount discharged from a first pilot chamber and a second pilot chamber so as to maintain internal pressures of the first pilot chamber and the second pilot chamber to a predetermined level when pressures of the first pilot chamber and the second pilot chamber are increased beyond the predetermined level, the first pilot chamber being formed by a compression retainer disposed above the main piston and a first housing disposed above the compression retainer, and the second pilot chamber being formed by a rebound retainer disposed under the main piston and a second housing disposed under the rebound retainer; and a bypass passage formed by the working fluid passing through the compression retainer and the rebound retainer symmetrically disposed above and under the main piston and a plurality of holes formed transversely to a vertical length direction of a spool rod, the bypass passage being formed by the working fluid flowing between a cylinder upper chamber and a cylinder lower chamber bypassing the first pilot chamber and the second pilot chamber, wherein the spool rod penetrates in central portions of the main piston, the compression retainer, the rebound retainer, the first housing, and the second housing.