Expansion chamber resistant noise-reducing structure for automotive power steering high-pressure oil pipe

Abstract

The invention provides an expansion chamber resistant noise-reducing structure for an automotive power steering high-pressure oil pipe, which is composed of a ball joint, a reducing steel tube, a high-pressure rubber tube and a metal sheath, wherein the outer diameter at two ends of the reducing steel tube is small and the outer diameter in the middle of the reducing steel tube is big, and different sections with small outer diameter and big outer diameter are in smooth transition for integration; one end of the reducing steel tube is connected with the ball joint by high-frequency welding, and the other end of the reducing steel tube is fastened with the high-pressure rubber tube and the metal sheath together to from a sealing structure; and the ball joint is processed and formed by the machining via a numerical control machine, and the reducing steel tube is formed by using a special die to perform the cold-extruding and stretching. In the invention, the expansion chamber resistant noise-reducing structure is formed after the whole high-pressure steel tube is contracted so as to effectively reduce or eliminate noise in a steering system. The MOAN noise in the steering system is eliminated; a liquid channel pipe adopts a thick tube segment with a large section and a thin tube at the terminal thereof to section and length of an expansion chamber to change reflective property and interference property of an acoustic wave, thereby further changing noise elimination quantity and maximum noise elimination frequency.

Description

technical field [0001] The patent of the present invention relates to the field of automobile power steering system, which is a high-pressure oil pipe in the automobile power steering system, which is connected between the oil pump and the steering gear, and reduces the internal oil vibration and noise structure. Background technique [0002] At present, the power steering high-pressure oil pipe assembly of automobiles is mainly composed of steel pipes with a certain outer diameter and wall thickness, which are formed, bent, and assembled with rubber hoses at both ends. As a result, there will often be steering noise, similar to buzzing, which is called MOAN in the GM product implementation standard. The specific performance is that the steering system will make a buzzing sound when the steering wheel is turned, the steering stops, the sound stops, and the steering wheel is turned to the limit position. The humming sound becomes more intense when driving, which seriously aff...

AI Technical Summary

Problems solved by technology

[0002] At present, the power steering high-pressure oil pipe assembly of automobiles is mainly composed of steel pipes with a certain outer diameter and wall thickness, which are formed, bent, and assembled with rubber hoses at both ends. As a result, there will often be steering noise, similar to buzzing, which is called MOAN in the GM product implementation standard. The specific performance is that the steering system will make a buzzing sound when the steering wheel is turned, the steering stops, the sound stops, and the steering wheel is turned to the limit position. The humming sound becomes more intense, seriously affecting the comfort of the vehicle, and being in a noisy environment for a long time will affect the health of the occupants of the vehicle

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