Liquid injection method for hydraulic bushing for rail transit

Abstract

The invention provides a liquid injection method for a hydraulic bushing for rail transit. The liquid injection method comprises the following steps that (1) a liquid injection hole is formed in an outer sleeve of the hydraulic bushing, a flow channel is formed in the periphery of a rubber main spring of the hydraulic bushing to form a liquid injection channel for injecting liquid into an airtightliquid chamber of the hydraulic bushing, and the liquid injection hole communicates with the flow channel in an butted mode; (2) the to-be-injected liquid is subjected to vacuumizing; (3) the airtight liquid chamber of the hydraulic bushing is subjected to vacuumizing through the liquid injection hole; and (4) the to-be-injected liquid is injected into the airtight liquid chamber through the liquid injection hole till filling is achieved. The liquid injection method has the advantages of guaranteeing the vacuum degree requirement of the airtight liquid chamber, and being easy to machine and high in precision.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority of Chinese patent application CN201611095592.5 filed on December 2, 2016 and Chinese patent application CN201611096400.2 filed on December 02, 2016, the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to the field of rail transportation, in particular to a liquid injection method for a hydraulic bushing used in rail transportation. Background technique [0004] The existing hydraulic bushing products are all used in the field of automobile suspension, mainly to meet the requirements of high stiffness and large damping at low frequencies or small stiffness and small damping at high frequencies, so as to achieve the purpose of quickly attenuating vibration and noise reduction. At present, hydraulic bushings There is no relevant application in the field of rail transit. The hydraulic bushing on the existing automobile usua...

AI Technical Summary

Problems solved by technology

It is difficult to ensure the vacuum degree of the liquid chamber in the existing liquid injection method, resulting in low dynamic performance of the hydraulic bushing and noise in the fluid flow; due to the long axial liquid injection channel, it cannot be injected quickly, and it is easy to Fluid remains in the hole, which leads to low efficiency and waste; at the same time, the axial liquid injection channel is long and the liquid injection hole is small, which makes the drill bit deflection large during processing, making processing difficult, and the machining accuracy of the liquid injection hole cannot be effectively guaranteed. Machining radial liquid injection channel, high cost and low production efficiency

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