Expansion-pipe-type automatic gap-adjusting piston mechanism

Abstract

The invention relates to an expansion-pipe-type automatic gap-adjusting piston mechanism. A ball head is fixed to an end of a working section of a pull rod, the pull rod is sleeved with an expansion pipe, the outer circumferential surface of the expansion pipe is sleeved with a spring, a piston is sleeved with the spring, an open end of the piston is in threaded connection with the outer surface of a blind nut, and the inner surface of a closed end of the piston is attached to the outer end face of a spring seat; an oil chamber is formed between the inner end face of the closed end of the piston and the outer end face of the spring seat, and the oil chamber communicates with an inner cavity of the piston through an oil through hole; and the space between the inner surface of an air cylinder seat of a lining and the outer surface of the piston is a stroke cavity of the piston, and oil inlets evenly distributed in the circumference of the lining communicate with the stroke cavity. According to the expansion-pipe-type automatic gap-adjusting piston mechanism, the expansion pipe is adopted for gap adjustment, stable expansion force is generated through plastic deformation of a pipe material of the expansion pipe, the defects that a spring sleeve is poor in friction force stability, and can generate stress relaxation after being used for a long time are overcome, the use reliability is high, moreover, the structural space is small, the weight is light, and the expansion-pipe-type automatic gap-adjusting piston mechanism is suitable for small and medium-sized brake machine wheels.

Description

technical field [0001] The invention relates to the field of aircraft wheel brake systems, in particular to a lightweight expansion tube type automatic gap adjustment piston mechanism soaked in brake hydraulic oil. Background technique [0002] The wheel brake system is a key airborne system to ensure the safety of aircraft takeoff and landing. According to Boeing's statistics, catastrophic accidents occurred when aircraft maneuvered on the ground accounted for 41% of the total accidents, most of which were related to brake system failure. In the 20th century, the National Aeronautics and Space Administration and the Federal Aviation Administration (FAA) used the McDonnell Douglas DC-9 aircraft to jointly conduct a large series of technical research and flight tests on the braking system. . This unprecedented high-standard joint technical research not only reflects the technical difficulty of developing the wheel and brake system, but also reflects the high attention and p...

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Problems solved by technology

[0008] Messier Bugatti Doughty Company disclosed a brake actuator for aircraft hydraulic brakes in the invention patent with the notification number CN104976255B, which is a typical expansion tube type automatic gap adjustment piston mechanism with independent The sealing structure isolates the hydraulic oil and the expansion tube, but the product requires a large structural space and heavy weight

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