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Method for Determining the Surface Hardness and Roughness of Aircraft Brake Valve Spool and Valve Sleeve

A matching surface and roughness technology, applied in the manufacturing field of aircraft brake products, can solve problems such as internal leakage of brake valves, achieve the effects of prolonging wear life, reducing production costs, and saving research and development resources

Inactive Publication Date: 2017-04-12
XIAN AVIATION BRAKE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] In order to overcome the lack of internal leakage of the brake valve caused by the unreasonable roughness of the mating surface of the spool and the valve sleeve and the unreasonable hardness of the mating surface in the prior art, the present invention proposes a method for determining the spool and valve of the aircraft brake valve. Method for setting the hardness and roughness of mating surfaces

Method used

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  • Method for Determining the Surface Hardness and Roughness of Aircraft Brake Valve Spool and Valve Sleeve
  • Method for Determining the Surface Hardness and Roughness of Aircraft Brake Valve Spool and Valve Sleeve

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Embodiment Construction

[0046] Aircraft brake brake valve of the present invention is a typical spring mass system, used for 210kg / Cm 2 The oil source pressure is converted to 140kg / Cm 2 brake pressure. The working principle of the aircraft brake valve is: when braking, the driver steps on the pedal, compresses the decompression spring, the spring force presses the valve core, opens the oil inlet chamber, and makes the 210kg / cm 2 A part of the pressure oil enters the brake chamber and leads from the brake chamber to the brake wheel. The other part enters the pressure-sensing chamber through the oil hole inside the spool and acts on the bottom of the spool. When the pressure-sensing pressure at the bottom of the spool and the spring force reach a balance state, the spool moves to close the oil-inlet chamber.

[0047] The brake valve is composed of a spring assembly, slide valve assembly, sleeve assembly, housing, etc. During the assembly and debugging process, the spring force of the spring assembly...

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Abstract

A method of determining the hardness and roughness of a cooperation surface of a valve core and a valve pocket of an airplane brake valve comprises the steps of determining the hardness of the cooperation surface of the valve core and the valve pocket according to an internal leakage control requirement, and determining the roughness of the cooperation surface of the valve core and the valve pocket according to the internal leakage control requirement. By determining the reasonable hardness of the cooperation surface of the valve core and the valve pocket, the method of the present invention is an important approach of satisfying the service life requirement, and reducing the production cost.

Description

technical field [0001] The invention relates to the manufacturing field of aircraft brake products, in particular to a method for determining the hardness and roughness of the mating surfaces of a valve core and a valve sleeve of an aircraft brake valve. Background technique [0002] Internal leakage is a common failure of aircraft brake valves. Internal leakage refers to the failure of hydraulic oil to leak from the high-pressure chamber through the gap between the valve core and the valve sleeve to the oil return chamber, causing the brake pressure to drop. [0003] The aircraft braking system at home and abroad is designed with take-off line braking function, landing anti-skid braking function, ground turning difference braking function, and ground parking braking function. Any function that does not meet the design requirements is a failure. The brake valve is a hydraulic accessory that outputs brake pressure in the brake system. Its function is to input the rated pressu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00
Inventor 乔建军张宏艳
Owner XIAN AVIATION BRAKE TECH