1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.Copyright 1999 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.
3、A.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8510 FAX: (724) 776-0243TO PLACE A DOCUMENT ORDER: (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS: http:/www.sae.org400 Commonwealth Drive, Warrendale, PA 15096-0001AEROSPACE INFORMATION REPORTAIR853REV.AIssued 1977-07Reaffirmed 1994-09Revised 1999-1
4、0Superseding AIR853Disconnect Systems, Accessory Drive ShaftFOREWORDChanges in this revision are format/editorial only.1. SCOPE:This document defines the functional requirements of basic types of disconnect devices used in airborne accessory installations.1.1 Purpose:The purpose of this report is to
5、 provide to accessory manufacturers general design concepts for accessory drive shaft disconnect devices.2. REFERENCES:There are no referenced publications specified herein.3. GENERAL:Disconnect devices in present military and commercial service were designed to meet requirements of each engine acce
6、ssory installation. It is not considered feasible to establish a standard for such systems.3.1 Basic types of disconnect devices used in airborne accessory installations:a. Jaw clutchb. Extractable shaft, mechanically (solenoid operated) or thermally energizedc. Spring clutchd. Severed sectionSAE AI
7、R853 Revision A- 2 -4. FUNCTIONAL REQUIREMENTS:4.1 Actuation of the disconnect system may be operated remotely, such as from the flight control compartment by manual, electrical or other means such as automatic control. Also, the actuation may be accomplished thermally within the accessory.4.2 Means
8、 for detecting and displaying an impending malfunction of the driven accessory should be provided for remotely actuated disconnect systems. Means presently in service are:a. Differential oil temperatureb. Excessive oil temperaturec. Pressure-sensingd. Speed or frequency-sensinge. Excessive generator
9、 temperaturef. Excessive drive temperature4.3 Positive disengagement of the accessory input shaft from the power-source output shaft should be accomplished.4.4 A separate power source should not be required to decouple the accessory from the input shaft. Any force on the mating shaft during decoupli
10、ng shall be within the limits defined for that drive.4.5 Disconnect should occur at or near the accessory input spline.4.6 Adequate lubrication should be provided for disconnect designs which keep an accessory input portion of the device rotating after a disconnect is performed.4.7 Resetting should be accomplished only when power source is static on the ground.PREPARED UNDER THE JURISDICTION OFSAE COMMITTEE AE-1, ENGINE ACCESSORY INSTALLATIONS
