Low-HC-permeability fixing support frame for pressure sensor of fuel tank

Abstract

The invention relates to a low-HC-permeability fixing support frame for a pressure sensor of a fuel tank. The low-HC-permeability fixing support frame comprises an upper fixing support frame and a lower fixing support frame which can be engaged with each other, wherein assembly holes are correspondingly arranged at the middle positions of the upper fixing support frame and the lower fixing supportframe; a position-limiting part is arranged on one side of the upper fixing support frame; an annular step is arranged at the bottom surface of the lower part of the upper fixing support frame; engaging blocks are arranged on two side walls of the lower part of the annular step; the lower fixing support frame is provided with a rotary groove; and two side walls of the rotary groove are provided with locking limiting assemblies engaged with the engaging blocks. Through the arrangement of the position-limiting part, position-limiting blocks, a position-limiting stud and the locking limiting assemblies, and by adopting a method of combining the upper fixing support frame made of PA12 materials with the lower fixing support frame made of HDPE materials, the low-HC-permeability fixing supportframe for the pressure sensor of the fuel tank not only achieves the fixing of the pressure sensor of the fuel tank, but also effectively reduces the HC permeation and emission and satisfies the welding and assembly performance of the fuel tank.

Description

technical field [0001] The invention relates to a low-permeation fixing structure for a fuel tank pressure sensor, in particular to a low-HC permeation fixing bracket for a fuel tank pressure sensor. Background technique [0002] At present, the National VI fuel system has added OBD II leakage diagnosis requirements. Generally, OEMs adopt a negative pressure diagnosis strategy, which requires the use of fuel vapor pressure sensors. There are generally two fixed forms of this sensing element at present; one is fixed on the oil pump, and the other is fixed on the evaporation pipeline; these two forms can meet the HC evaporation emission requirements of the National VI. [0003] However, some fuel systems are difficult to implement the above two arrangements due to the limitations of the peripheral parts of the vehicle body. It is necessary to directly arrange the pressure sensor on the fuel tank body, which needs to be fixed with a bracket, and needs to meet the National VI lo...

AI Technical Summary

Problems solved by technology

[0003] However, some fuel systems are difficult to achieve the above two layouts due to the limitations of the surrounding parts of the vehicle body. The pressure sensor needs to be directly arranged on the fuel tank body, which requires a bracket to be fixed, and it needs to meet the National VI low evaporative emission requirements

Most of the brackets of traditional fuel tanks are fixed by hot plate welding. The welded brackets and fuel tanks are made of the same material HDPE, but HDPE has a large HC vapor emission, which is difficult to meet the requirements of the National VI low evaporative emissions

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