Patent ID: 9644518
Date: 2017-05-09
CPC Classifications: B60K,B67D,F01N

Claim:
1. A urea filler neck for preventing a urea overflow, comprising: a filler housing forming a urea path in which injected urea flows to a urea tank; and an injection gun guide provided in the filler housing, an end of an injection gun fixed by the injection gun guide to limit an insertion position of the injection gun inserted into an inlet of the filler housing, wherein an injection gun guide flooding phenomenon is generated, in which urea flowing backward from the urea tank rises to block an air flow in the filler housing being generated in the injection gun guide, a filler housing pressure increasing phenomenon is generated, in which a pressure in the filler housing is increased due to blocking of the air flow by the injection gun guide flooding phenomenon being generated in the injection gun guide, the injection gun is shut-off by detecting the pressure in the filler housing pressure increasing phenomenon in the injection gun guide, and the area overflow flowing backward is delayed by a back flow buffering phenomenon in which the urea flowing backward is stored in an inner space of the filler housing in the injection gun guide, wherein the injection gun guide comprises: a urea buffer portion which comes into contact with an inner peripheral portion of a housing body of the filler housing and is formed with a generation space of the back flow buffering phenomenon; and a urea injection port spaced apart from a connection section in which a diameter of the housing body is smaller than a diameter of a housing extension portion such that the housing extension portion connected to the housing body has a changing section, so that a generation space of the filler housing pressure increasing phenomenon by the injection gun guide flooding phenomenon is formed in the urea injection port and the end of the injection gun is fixed by the urea injection port, and wherein the injection gun guide is assembled to be press-fitted into the inner space of the filler housing.