SEAL DEVICE FOR HYDRAULIC CIRCUIT

摘要

Provided is a seal device for a hydraulic circuit in which an oil passage, for the supply or discharge of pressure oil with respect to a hydraulic actuator that operates by virtue of hydraulic oil, is formed across at least two members that operate relatively, and a seal material that seals the gap between these two members in a liquid-tight state is disposed inside a groove part formed in at least one of the two members, wherein in the seal device for a hydraulic circuit, a communication part is formed to allow the groove part to communicate with one part on the oil passage so that the pressure oil inside the groove moves in accordance with the supply or discharge of pressure oil with respect to a hydraulic actuator.