| 摘要 |
PURPOSE:To prevent the pressure boosted upon completion of delivery of fuel pump from functioning onto a filter by providing a check valve at the spacific position in an oil supply path while coupling between the oil supply path and the oil return path at specific position through a bypath provided with a relief valve. CONSTITUTION:The boosted pressure produced at the oil supply side upon completion of delivery of a fuel pump 11 is transmitted to an oil supply tube 6 to close a check valve 101 thus to prevent application of high pressure onto a filter 10. But, since an oil supply pump 9 is operating continuously, closing of the check valve 101 will cause boosting of pressure in an oil supply tube 5, the filter 10 and a conduit 103. Here, a relief valve 102 will open to relieve the pressure to a conduit 104 thus to suppress pressure boost. Consequently, the pressure boost in the oil supply tube 6 will damp gradually combined with flow-out to an oil return tube 7 and upon dropping below the supply pressure from an oil supply pump 9, the check valve 101 will open to supply fuel. Consequently, normal oil supply pressure is maintained to close the relief valve 102. |
