Aircraft hydraulic system

Inactive Publication Date: 2019-04-18
HAMILTON SUNDSTRAND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]In the alternative or additionally thereto, in the foregoing embodiment, the heat transfer

Problems solved by technology

Unfortunately, the hydraulic fluids typically used in friction plate brake and clutch systems exhibit viscosities at low temperat

Method used

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  • Aircraft hydraulic system

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Embodiment Construction

[0026]Referring to FIG. 1, an aircraft 20 is illustrated having an aircraft hydraulic system 22 that utilizes a hydraulic fluid (i.e., see arrow 24). Examples of the hydraulic system 22 may include a friction plate brake system, a clutch system, a flight control actuation system, a helicopter hoist, and others. The aircraft hydraulic system 22 may include at least one friction plate 26 as is commonly known to one having skill in the art of hydraulic systems. It is contemplated and understood that the aircraft system may further include systems that utilize gear arrangement requiring lubrication.

[0027]Known “hydraulic fluids” that may be hydrocarbon-based, are commonly used in known aircraft hydraulic systems. Such hydraulic fluids may exhibit undesirably high viscosities at low temperatures of, for example, about negative sixty-five degrees Fahrenheit (−65° F.). One example of a traditional hydraulic fluid used in the aviation industry is Castrol Brayco® 795 (manufactured by the BP ...

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Abstract

An aircraft hydraulic system utilizes a hydraulic fluid that includes a heat transfer fluid and a friction modifier additive.

Description

BACKGROUND[0001]The present disclosure relates to a hydraulic system, and more particularly, to an aircraft hydraulic system and the hydraulic fluid used.[0002]Aircraft hydraulic systems may include systems having a friction plate brake and / or a clutch. Applications of the aircraft hydraulic system may include flight control actuation systems, helicopter hoists, and others. Traditionally, hydraulic fluids are used to provide lubrication between the plates, and friction modifiers are used as an additive to the hydraulic fluid to modify the frictional properties of the fluid in order to prevent stick and / or slip between the friction plates. Unfortunately, the hydraulic fluids typically used in friction plate brake and clutch systems exhibit viscosities at low temperature (e.g., −65° F.) that are higher than desired to achieve optimal performance of the friction plate brake and / or clutch systems.BRIEF DESCRIPTION[0003]An aircraft hydraulic system according to one, non-limiting, embodim...

Claims

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Application Information

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IPC IPC(8): C10M169/04C10M129/26
CPCC10M169/04C10M129/26C10N2240/08C10N2230/06C10N2220/022C10M2205/0206C10M2207/125C10M2205/0285C10M2207/12C10N2030/08C10N2030/02C10N2030/06C10N2040/08C10N2040/13C10N2020/02
InventorGAGE, MARC E.
OwnerHAMILTON SUNDSTRAND CORP