Oil inlet valve and high-pressure common rail fuel pump using same

Abstract

The invention discloses an oil inlet valve and a high-pressure common rail fuel pump using the same. The oil inlet valve comprises a circular valve block and a hollow guide cylinder connected onto the circular valve block; the guide cylinder is connected with the circular valve block to form a cylindrical structure with an inner cavity; a plurality of oil holes are formed in the cylinder wall of the guide cylinder. According to the oil inlet valve and the high-pressure common rail fuel pump using the same, the oil inlet valve is stable in motion, capable of timely returning, reliable in sealing and small in failure rate; the high-pressure common rail fuel pump using the oil inlet valve is stable in rail pressure, high in oil supply efficiency and not liable to fuel oil leakage.

Description

technical field [0001] The invention relates to the technical field of high-pressure common rail pumps, in particular to an oil inlet valve and a high-pressure common rail pump using the oil inlet valve. Background technique [0002] The oil inlet valve of the traditional high-pressure common rail pump is a plate valve structure, such as figure 1 , 2 shown. The traditional oil inlet valve 2 is installed on the oil inlet valve seat 1, and is sealed by the bottom surface of the oil inlet valve 2 and the upper end surface of the oil inlet valve seat 1. The upper end of the oil inlet valve 2 is equipped with an oil inlet valve spring 3, which can play a role in buffering and reducing the reset time of the oil inlet valve 2. The upper end of the oil inlet valve spring 3 is installed on the oil outlet valve core 5, the oil outlet valve core 5 and the oil outlet valve seat 4 are sealed by the cone surface, and the upper end of the oil outlet valve core is the oil outlet valve sp...

AI Technical Summary

Problems solved by technology

[0004] 1. During the oil suction process of the plunger, when the low-pressure oil enters the plunger chamber, the oil inlet valve 2 is not guided when it is opened, and it is prone to skewing. When the plunger presses oil, the oil inlet valve 2 cannot be reset in time to seal the oil inlet hole. Part of the oil will flow back, which will affect the oil supply efficiency of the oil pump

[0005] 2. When the inclined oil inlet valve 2 is reset, the force on the sealing surface is uneven, and the pressure per unit contact area is too large, which will easily cause the coating to fall off and affect the reliability of the product.

[0006] 3. When the oil inlet valve 2 is skewed, the oil inlet valve spring 3 is easy to bend, fall off and break, which may lead to reduced fuel supply efficiency, rail pressure fluctuations, oil inlet valve stuck, oil outlet valve stuck, fuel injector stuck, etc. failure occurs

[0007] This shows that the above-mentioned existing sheet type oil inlet valve obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

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