Patent ID: 9038659
Filing Date: 2015-05-26
Classification: F01M,F16K,Y10T

Abstract:
1. A relief valve device, comprising: a housing; a relief valve including a small-diameter section having a main pressure-receiving surface and a large-diameter section including a stepped site as an auxiliary pressure-receiving surface, the small-diameter section and the large-diameter section being formed integrally with each other; a valve passage including a small-diameter passage section and a large-diameter passage section; a main discharge flow channel that communicates the small-diameter passage section with the exterior of the housing; a main relief flow channel that communicates with the small-diameter passage section; an auxiliary relief flow channel that communicates with the large-diameter passage section; a solenoid valve mounted on the auxiliary relief flow channel; and a spring that elastically urges the relief valve in a direction opposite to a pressure relief direction, wherein the relief valve is displaced by both oil that flows into the large-diameter passage section pressing against the auxiliary pressure-receiving surface of the relief valve and oil that flows into the small-diameter passage section pressing against the main pressure-receiving surface of the relief valve, and wherein the solenoid valve is controlled so as to switch between communication and shut-off between the auxiliary relief flow channel and the large-diameter passage section, in accordance with an increase or a decrease in engine revolutions, and the oil that flows into the large-diameter passage section is discharged when the shut-off is implemented.