Patent ID: 8978694
Filing Date: 2015-03-17
Classification: F01M,Y10T

Abstract:
1. An oil relief valve apparatus, comprising: a valve hole that is formed in a pump housing of an oil pump and is provided between an oil passage and a relief passage to communicate therebetween; a plunger provided on an upper end of the valve hole; a support provided on a lower end of the valve hole; and an elastic member provided between the plunger and the support to elastically support the plunger; wherein the valve hole has an upper portion and a lower portion and is provided with the plunger that have different cross sectional areas therein; wherein the plunger has an upper end and a lower end having different cross sectional areas and face-contacts to the valve hole; and wherein the upper end of the plunger is slidably engaged to the upper portion of the valve hole; wherein the valve hole is provided so that a cross sectional area of the upper portion of the valve hole is smaller than a cross sectional area of the lower portion thereof; wherein the plunger is provided so that a cross sectional area of the upper end of the plunger is smaller than a cross sectional area of the lower end thereof; wherein an inclined portion inclined downwardly is provided between the upper portion and the lower portion of the valve hole; and wherein a step is formed between the upper end and the lower end of the plunger and is configured to selectively contact with the inclined portion of the valve hole.