Vice-driving lubricating structure of sliding valve of railway brake valve with automatic switching action

Abstract

The invention discloses a vice-driving lubricating structure of a sliding valve of a railway brake valve with automatic switching action. The vice-driving lubricating structure of the sliding valve of the railway brake valve with the automatic switching action comprises a main piston rod, a sliding valve and a graduating valve. An oil storage cavity is arranged in the main piston rod. A one-way valve assembly is arranged on the main piston rod. The oil storage cavity communicates with an oil outlet through an oil-way pipe, wherein the oil outlet is arranged at the non-working area of the working surface on the graduating valve. An oil inlet is arranged at the non-working area of the working surface of the sliding valve. The oil outlet of the graduating valve and the oil inlet of the sliding valve are not be communicated during an air inflation position and a pressure maintaining position in the cycle of motion of the railway brake valve, wherein the air inflation position and the pressure maintaining position occupy most of the time, while in the process of braking of the railway brake valve, the oil outlet of the graduating valve is instantly communicated with the oil inlet of the sliding valve, and the rest traveling all be closed. In this way, just as an automatic switch is arranged at the oil outlet of the graduating valve and the oil inlet of the sliding valve, the oil consumption of lubricating oil in the oil storage can be reduced greatly, and the existing time of a vice oil slick of the sliding valve and the vice service life of the sliding valve are prolonged remarkably.

Description

technical field [0001] The invention mainly relates to an active lubricating mechanism for a slide valve pair of a railway brake valve with an automatic switch function. Background technique [0002] Existing brake valves for railway vehicles have phenomena such as peeling off of the slide valve pair, pitting corrosion, and even leakage caused by poor lubrication during use, which seriously affects the performance stability of the brake valve. In order to overcome the above technical problems, an air control valve with an active lubrication structure is disclosed in the prior art (Patent No. 2015 2 0916572.4), which specifically discloses that it includes a main piston rod, a spool valve, a spool valve sleeve and a throttle valve. The main piston rod is provided with an oil storage chamber, and lubricating oil is stored in the oil storage chamber, and the chamber above the lubricating oil liquid level in the oil storage chamber is formed by a one-way valve arranged on the ma...

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Problems solved by technology

[0003] However, in the actual application process, we found that the oil outlet groove on the throttle valve and the oil inlet port on the slide valve in the above structure are always in a communication state during the action cycle of railway brake valve charging, braking, pressure maintaining, and charging. , when the working surface of the throttle valve and the slide valve is scratched to varying degrees, the lubricating oil in the oil storage chamber will be quickly lost through the scratched throttle valve and the working surface of the slide valve under the action of the pressure air in the oil storage chamber , but the purpose of prolonging the existence time of the oil film of the spool valve pair and the service life of the spool valve pair cannot be achieved

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