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Shock absorber and landing gear provided with such a shock absorber

A shock absorber, cylinder technology, applied in the direction of shock absorbers, springs/shock absorbers, shock absorbers, etc.

Active Publication Date: 2012-05-16
SAFRAN LANDING SYSTEMS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sealed bearings manufactured in this manner have several disadvantages
First, the valve arrangement needs to be manually actuated, and therefore the system needs to periodically verify the first dynamic gasket

Method used

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  • Shock absorber and landing gear provided with such a shock absorber
  • Shock absorber and landing gear provided with such a shock absorber
  • Shock absorber and landing gear provided with such a shock absorber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] see figure 1 , the shock absorber 1 can be seen in axial section. The shock absorber comprises a cylinder 2 with an opening 3 in which a rod 4 is slidably mounted inside the support rod 2 in a leak-tight manner. In the main application of the shock absorber as a member of the landing gear, the cylinder 2 constitutes the leg of the landing gear, while the rod 4 is a sliding rod 4 protruding downward from the landing gear. The sliding rod 4 carries the wheel axle, and the wheels of the landing gear are mounted on the on the axle.

[0018] Between the cylinder 2 and the slidable rod 4 extend two guide bearings, namely a bearing 5 fixed to the rod 4 and a bearing 6 fixed to the cylinder 2 which also performs a sealing function 6 .

[0019] The shock absorber 1 has an annular cavity 7 communicating with the inner volume of the cylinder 2 and extending firstly between the support rod 2 and the rod 4 and secondly between the bearing 5 and the bearing 6 . The volume of the a...

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PUM

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Abstract

The present invention relates to a shock absorber comprising a cylinder (2) in which a rod (4) is mounted such as to slide inside the cylinder by means of two bearings (5, 6) arranged between the cylinder (2) and the rod (4) such that said bearings (5, 6), the cylinder (2) and the rod (4) define therebetween an annular chamber (7), at least one of the bearings (5, 6) supporting a sealing means with at least two dynamic seals (9, 10) in contact with that of the rod (4) or of the cylinder (2) sliding relative to said bearing, the two dynamic seals defining an inter-seal space (11) therebetween, a valve means (12) installed in a duct of the bearing in order to selectively connect the annular chamber (7) and the inter-seal space (11).; The valve means (12) is passive and arranged such as to establish a normal connection between the annular chamber (7) and the dynamic inter-seal space (11) and automatically to isolate the inter-seal space from the annular chamber if the pressure in the annular chamber (7) is higher than a predetermined threshold pressure.

Description

technical field [0001] The invention relates to a shock absorber and a landing gear equipped with the shock absorber. [0002] One advantageous application of the invention is the aeronautical field, but even though it is more specifically intended for this application, the shock absorber can equally be used in other technical fields requiring shock absorbers. Background technique [0003] Typically, a shock absorber designed to be received within a landing gear includes a cylinder and a sliding rod. The rod slides in a leak-tight manner within a cylinder containing pressurized gas and damping liquid. To improve the connection between the cylinder and the rod, two bearings are used, including sealed bearings with the additional function of preventing damping liquids. In a known manner, the cylinder can constitute the leg of the undercarriage, or it can be manufactured separately. [0004] In a known first embodiment, the sealed bearing has a static washer on one side and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F9/36
CPCF16F2230/24F16F9/365
Inventor D·拉色达
Owner SAFRAN LANDING SYSTEMS