SAE AS 714A-1980 Aircraft Hydraulic Start Motor《飞机液压起动马达》.pdf

1、AEROSPACESTANDARDCopyright 1980 by Society of Automotive Engineers, Inc.All rights reserved.Printed in U.S.AIssued 4-1-65Revised 6-15-80AS 714 ASociety of Automotive Engineers, Inc.400 COMMONWEALTH DRIVE, WARRENDALE, PA. 15096SAETechnicalBoard rulesprovide that: “Alltechnicalreports, including stand

2、ardsapproved and practicesrecommended, are advisoryonly.Theiruse byanyone engaged inindustryortradeortheiruse bygovernmentalagenciesisentirelyvoluntary.There isno agreement to adhere to anySAEstandardorrecommendedpractice, and no commitment to conform to orbe guidedbyanytechnicalreport. In formulati

3、ng and approving technicalreports,the board and itsCommitteeswillnot investigate orconsiderpatentswhich mayapplyto the subjectmatter.Prospectiveusersof the report are responsibleforprotecting themselvesagainst liabilityforinfringement of patents.”AIRCRAFT HYDRAULIC START MOTOR1. SCOPEThis Aerospace

4、Standard (AS) establishes the requirements for hydraulic start motors suitable for use in starting a gas turbine engine, and the methods to be used for demonstrating compliance with these requirements.1.1 Model Specification: A model specification shall be prepared for each starter model utilizing t

5、his AS as a guide and supplying specific requirements where appropriate.2. APPLICABLE DOCUMENTSThe following documents shall form a part of this AS to the extent specified herein. The applicable issue of each shall be that in effect on the date of this AS unless otherwise specified in the manufactur

6、ers model specification. Supplementary specifications, standards, or the like, which by reference in any of the following publications are indicated to be part thereof, shall not be considered as effective except as specifically stated in the manufacturers model specification or as may be otherwise

7、mutually agreed upon between the vendor and the purchaser.2.1 Government Documents: Available from Naval Publications and Forms Center, 5801 Tabor Avenue, Philadelphia, PA 19120.2.1.1 Federal Specifications:QQ-N-290 Nickel PlatingQQ-C-320 Chromium Plating (Electrodeposited)2.1.2 Military Specificati

8、ons:MIL-M-3171 Magnesium Alloy, Processes for Corrosion Protection ofMIL-S-5002 Surface Treatments and Inorganic Coatings for Metal Surfaces of Weapons SystemsMIL-B-5087 Bonding, Electrical, and Lighting Protection, for Aerospace SystemsMIL-C-5541 Chemical Films for Aluminum and Aluminum AlloysMIL-C

9、-6021 Casting, Classification and Inspection ofMIL-W-6858 Welding, Resistance, Aluminum, Magnesium, Non-hardening Steels, or Alloys, NickelAlloys, Heat-resisting Alloys, and Titanium Alloys, Spot and SeamMIL-W-6873 Welding, Flash, Carbon and Alloy SteelMIL-B-7883 Brazing of Steels, Copper, Copper Al

10、loys, Nickel Alloys, Aluminum and Aluminum AlloysMIL-M-7997 Motor, Aircraft Hydraulic, Constant Displacement General Specification forMIL-I-8500 Interchangeability and Replaceability of Component Parts for Aircraft and MissileMIL-W-8604 Welding of Aluminum Alloys, Process forMIL-W-8611 Welding, Meta

11、l Arc and Gas, Steels and Corrosion and Heat Resistant Alloys, Process forMIL-A-8625 Anodic Films; Corrosion -protective for Aluminum AlloysAS 714A- 2 -2.1.2 (Contd.)MIL-F-8815 Filter and Filter Elements, Fluid Pressure, Hydraulic Line, 15 Micron Absolute, Type IISystemsMIL-S-8879 Screw Threads, Con

12、trolled Radius Root with Increased Minor Diameter, GeneralSpecification forMIL-T-10727 Tin Plating2.1.3 Military Standards:MIL-STD-130 Identification Marking of U.S. Military PropertyMIL-STD-143 Standards and Specifications, Order of Precedence for the Selection ofMIL-STD-453 Inspection, Radiographi

13、cMIL-STD 794 Part and Equipment, Procedures for Packing and Packaging ofMIL-STD-810 Environmental Test MethodsMIL-STD-889 Metals, DissimilarMIL-STD-1523 Age Control of Age-sensitive Elastomeric MaterialMIL-STD 1595 Aerospace Welder Performance Qualification Safety Wiring and Cotter Pinning, General

14、Practice forMS3336(AS) Accessory Drives, Aircraft Engine, Reference Chart forMS33649 Bosses, Fluid Connection - Internal Straight Thread2.1.4 Military Handbooks:AFSC DH 1-3 Design for MaintainabilityAFSC DH 1-6 System Safety2.2 SAE Publications: Available from Society of Automotive Engineers, Inc.,

15、400 Commonwealth Drive, Warrendale, PA 15096.ARP 243 Nomenclature, Aircraft Hydraulic and Pneumatic SystemsAIR 1160 Aircraft Engine and Accessory Drives and Flange Standards3. REQUIREMENTS3.1 Item Definition: This section describes the general requirements for hydraulic starters, either fixed or var

16、iable displacement, suitable for operation in hydraulic systems.3.1.1 Interface Definitions:3.1.1.1 Hydraulic Fluid: The starters shall meet the functional requirements using the hydraulic fluid defined in the model specification. Contamination level shall be based upon continuous filtration of the

17、inlet fluid through a 15 micron absolute filter conforming to MIL-F-8815.3.1.1.2 Rated Inlet Pressure: The rated inlet pressure is defined as the maximum pressure required at the starter inlet port when operating at rated torque, rated outlet pressure and rated temperature. The rated inlet pressure

18、shall be stated in the model specification.3.1.1.3 Rated Outlet Pressure: The rated outlet pressure is defined as the pressure at the starter outlet port against which the starter is designed to produce rated torque at rated inlet pressure and rated temperature. The rated outlet pressure shall be st

19、ated in the model specification.3.1.1.4 Rated Temperature: The rated temperature is defined as the maximum fluid temperature at the starter inlet port when operating at rated torque and rated pressures. The rated temperature shall be stated in the model specification.3.1.1.5 Mounting Pad: The mounti

20、ng pad criteria shall be specified in the model specification.AS 714A- 3 -3.1.1.6 Starter Drive: The starter shall incorporate a spline-shaft type connection as defined in the model specification. The hydraulic motor drive shall be in accordance with AIR 1160 or MS 3336 (AS).3.2 Characteristics:3.2.

21、1 Performance Characteristics:3.2.1.1 Hydraulic Pressure:3.2.1.1.1 Operating Pressure: The component shall operate as specified throughout the temperature and the operating pressure range, and shall operate after exposure to peak pressure of 135% of the normal operating pressure or as specified in t

22、he model specification.3.2.1.1.2 Non-Operating Proof and Burst Pressure: The compartment shall be designed for inlet proof and burst pressures of 150 and 250% of operating pressure within the fluid temperature range specified and within the applicable ambient temperature range. Outlet and case proof

23、 and burst pressures shall be stated in the model specification.3.2.1.1.3 Leakage: There shall be no external leakage through static seals and structure throughout the operating pressure range or while subjected to proof pressure within the fluid temperature ranges specified herein. A slight wetting

24、, insufficient to form a drop, shall not be considered leakage. Leakage from the drive shaft seal, under specified operating conditions, shall not exceed the values specified in 4.5.7.4.3.2.1.2 Torque:3.2.1.2.1 Rated Torque: The rated torque is defined as the minimum torque at the starter output sha

25、ft when operating at rated pressures, rated temperature, and rated speed. The rated torque shall be stated in the model specification together with the maximum continuous torque, the maximum peak transient torque and the minimum torque at minimum cut-off speed. A rated torque versus speed characteri

26、stic curve shall be included as per Fig. 1.3.2.1.3 Flow:3.2.1.3.1 Rated Flow: The rated flow is defined as the maximum fluid flow needed to meet the torque requirements at any starter output shaft speed from zero RPM to cutout speed. The rated flow shall be stated in the model specification together

27、 with the maximum flow during no-load operation.3.2.1.4 Speed:Rated Speed: The rated speed is defined as the maximum starter output shaft speed at which rated torque is produced and is usually related to engine light-off speed. The rated speed shall be stated in the model specification.Cut-out Speed

28、: The cut-out speed is defined as the starter output shaft speed at which the cut-out device will signal the termination of starter operation, for example, opening a normally closed electrical circuit. The minimum and maximum cut-out speeds shall be stated in the model specification.Over-running Spe

29、ed: The starter shall be capable of continuous over-running operation at the maximum over-running speed stated in the model specification.3.2.1.5 Contamination: The starter shall meet the performance requirements herein when operated with hydraulic fluid filtered prior to use through a 15 micron abs

30、olute filter conforming to the requirement of MIL-F-8815.AS 714A- 4 -3.2.1.6 Positioning: The starter operation shall be unaffected by the position in which the starter is mounted.3.2.2 Physical Characteristics:3.2.2.1 Polar Moment of Inertia: The effective mass polar moment of inertia of the starte

31、r rotating parts at the starter output shaft, shall be specified in the model specification.3.2.2.2 Dimensions: The starter envelope shall be within the dimensions shown on the outline drawing of the model specification and the location of fluid ports and electrical connectors shall be as shown. The

32、 location of the center of gravity of the starter shall be indicated on the drawing.3.2.2.3 Weight: The dry weight of the starter shall not exceed the value stated in the model specification.3.2.2.4 Overhung Moment: The maximum overhung moment of the complete starter with fluid shall be specified in

33、 the model specification.3.2.2.5 Drive Couplings: The starter shall incorporate a drive coupling with a shear section or torque limiting device sized so that the maximum static torque transmitted will not exceed the value stated in the model specification. The drive coupling shall be held in place b

34、y a positive retainer and shall be replaceable without disassembly of the starter.3.2.2.6 Ports: Inlet and outlet ports shall conform to MS 33649. Seal drain ports shall conform to MS 33649-04. All ports shall be sized and located as shown on the manufacturers installation drawing. The starter desig

35、n shall eliminate the necessity for a case drain port. Allowable loads on the ports from attached lines shall be specified in the model specification.3.2.2.7 Continuous Motoring: The starter shall be capable of continuous motoring operation for a minimum of 5 min. at any speed and torque within the

36、limits of Fig. 1.3.2.2.8 No-Load Operation: The starter shall be capable of operating for a minimum of 1 min. with the output shaft unloaded and the cut-out device inoperative when the hydraulic fluid is maintained at rated temperature and pressure.3.2.2.9 Automatic Cut-out Device: The starter desig

37、n shall incorporate an automatic cut-out device which will open a normally closed circuit within the cut-out speed range specified in the model specification. Motor cavitation during cutout conditions shall be prevented.3.2.2.10 Electrical-Hydraulic Components:3.2.2.10.1 Operating Characteristics: E

38、lectrically operated components shall be deisgned for minimum electrical power consumption, consistent with other requirements of this specification. Electrically actuated components that are designed to return automatically to the original position when deenergized shall do so with up to 150% of th

39、e maximum operating pressure applied to the component when no less than 10% of the normal operating voltage is present.3.2.2.11 Shaft Seal: The starter design shall incorporate output shaft seal assemblies to prevent the leakageof hydraulic fluid into the drive pad cavity.3.2.2.12 Magnetic Chip Dete

40、ctor: The starter shall include a magnetic chip detector.3.2.2.13 Starter Controls: Variable displacement starters shall be equipped with suitable controls for providing a controlled change in displacement during the starting cycle.3.2.2.14 Clutch Assembly: The starter design shall incorporate an ov

41、errunning clutch mechanism to provide engagement, disengagement and re-engagement of the output shaft independent of any external signal.AS 714A- 5 -3.2.2.15 Disengagement and Re-engagement: Provision for disengagement and re-engagement of the starter shall be internal in the construction and shall

42、be independent of external signal. Re-engagement of the starter after interruption during a starting cycle shall be accomplished without damage. There shall be no limitation, within the rated life, of the member of starts performed in succession.3.2.2.16 Lubrication: It is preferred that the starter

43、s be self-lubricated with no provisions for lubrication other than the hydraulic fluid and or gear case lubricant. It is further desired that only the specified hydraulic fluid be used to lubricate seals during assembly and installation of the starters.3.2.2.17 Balance: The starter shall be inherent

44、ly balanced as specified in MIL-M-7997. The self-induced vibration of the motor drive interface shall not exceed 0.005-in. double amplitude or 3.5G, whichever is less, between 5 cps and 2,000 cps.3.2.2.18 Drive Couplings: The starter design shall incorporate a replaceable drive coupling with a shear

45、 section or other torque limiting device sized to limit transmitted torque within the intended engine drive rating.3.2.2.19 Rotation: Drive rotation for the starter shall be identified as viewed from the anti-drive end of the starter and shall be stated in the model specification.3.2.2.20 Parts Cont

46、ainment: In the event of an internal failure of the starter all parts shall be contained within the starter housing and there shall be no loss of fluid from the starter due to failure.3.2.2.21 Speed Limiter: The no-load runaway speed of the starter shall be limited to a safe value, either by inheren

47、t design characteristics or by the incorporation of speed limiting devices.3.2.2.22 Fire Resistance: The starter shall be capable at minimum flow conditions of withstanding a 2,000F ambient temperature for 5 min. with an initial fluid and case temperature of 275F. The shaft seal and external leakage

48、 shall be in accordance with 3.2.2.11. The motor need not operate after exposure to this temperature.3.2.2.23 Acceleration and Deceleration: The starter shall be capable of accelerating from zero to rated speed and decelerate from rated to zero speed in 0.02 sec. The acceleration/deceleration, howev

49、er, shall not exceed 50,000 radians per sec. squared. The starter shall not be damaged by such operating conditions.3.2.3 Reliability:3.2.3.1 Storage Life: The storage life of the starter (except for age-sensitive items) shall be a minimum of 10 years and when packaged in accordance with MIL-STD-794.3.2.3.2 Operating Life: The model specification shall specify the useable life of the starter, in terms of flight or engine operating hours.3.2.3.3 Rated Endurance Life: The model specification shall state the required number of start cycles for which the unit must be designed.3.2.4 Maintain