1、MIL-M-7777C lb 77777Ob OLBb3bb O 7 MIL-M-7997C 24 September 1981 Sup er seding 15 October 1973 MIL-M-7997B MILITARY SPECIFICATION MOTORS, AIRCRAFT HYDRAULIC, CONSTANT DISPLACEMENT GENERAL SPECIFICATION FOR ) This specification is approved for use by all Departments and Agencies of the Department of
2、Defense. 1. SCOPE 1.1 Scope. This Specification covers constant displacement hydraulic motors, generally remotely mounted, using hydraulic fluid under pressure as the energy transfer medium for driving various accessories. Hydraulic motors shall be suitable for use in aircraft hydraulic systems conf
3、orming to and as defined in MIL-H-5440 and MIL-H-8891 as applicable. 1.2 Classification. Aircraft constant displacement hydraulic motors shall be of the following types and classes, as specified (see 6.2): . Range Rated Type I. -650 (-54zC) to +i602 (7i0g) Type II. -65 F (-54 C) to +2750F (1350C) Ty
4、pe III. -65F (-54OC) to +390 F (200 C) Class 1500, 1500 psi (103 Bar) rated inlet pressure Class 3000. 3000 psi (207 Bar) rated inlet pressure Class 4000. 4000 psi (276 Bar) rated inlet pressure Category A. Secondary. Secondary flight controls, winches,. gun drives, constant speed drives, transfer p
5、ackages, etc. Category B. Primary. Primary flight controls, modulating slats, etc. endurance test requirements. See Para 4.6.15 for utility and primary motor Beneficial comments (recommendations, additions, deletions) and any pertinent data which may 6e of use .in improving this document should be a
6、ddressed to: Naval Air Engineering Center, Engineering Specifications and Standards Department (Code 93), Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. P Provided by IHSNot for ResaleN
7、o reproduction or networking permitted without license from IHS-,-,-2 APPLICAELE DOCUblENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. Unless otherwise specified, the Eollowing specifications, standards, and handbooks of the issue listed in that issue of the Department
8、 of Defence Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL NN-P-530 QQ-C-320 QQ-N-290 QQ-P-4 16 QQ-S-365 QQ-2-325 PPP-B-56 6 PPP-B-585 PPP-B-59 1 PPP-B-601 PPP-B-621 PPP-B-636 PPP-B
9、-676 PPP-T- 60 1.1 ILITAY MIL-P- 1 16 MIL-B- 12 1 Plywood - Flat Panel Chromium Plating (Electrodeposited) Nickel Plating (Electrodeposited) Plating, Cadmium (Electrodeposited) Silver Plating (Electrodeposited) Zinc Coating, Electrodeposited, Requirements for Boxes, Folding, Paperboard Boxes, Wood,
10、Wirebound Boxes, Fiberboard, Wood-Cleated Boxes, Wood, Cleated-Plywood Boxes, Wood, Nailed and Lock-Corner Box, Fiberboard Boxes, Set-up Tape: Pressure-Sensitive Adhesive, Waterproof, for Packaging Preservation, Methods of Barrier Material, Greaseproofed, Waterproofed, Flexible Provided by IHSNot fo
11、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-8890 b MIL-L-10547 MIL-M-7777C 16 7777906 0386368 Y MIL-M-7997C MIL-C-5501 Caps and Plugs, Protective, Dust and Moisture Seal MIL-(2-554 1 Chemical Films and Chemical Film for Aluminum and Aluminum Alloys MIL-H-5606 H
12、ydraulic Fluid, Petroleum Base, Aircraft, Missile, and Ordnance MIL-H-6083 Hydraulic Fluid, Petroleum Base, Preservation and Testing - MIL-A-8625 Anodic Coatings, for Aluminum and Aluminum Alloys MIL-H-8775 Hydraulic System Components, Aircraft and 1 Missiles, General Specification for MIL-F-8815 Fi
13、lter and Filter Elements, Fluid Pressure, Hydraulic Line, 15 Micron Absolute and 5 Micron Absolute Type II Systems MIL-S-8879 Screw Threads, Controlled Radius Root With Increased Minor Diameter; General Specification for Hydraulic Components, Type III (-65 to 450 F) , General Specification for Liner
14、s, Case, and Sheet, verwrap, Water- Vaporproof or Waterproof, Flexible Tin Plating; Electrodeposited or Hot Dipped, fcr Ferrous and Nonferrous Metals Corrosion Preventive Compound, Petrolatum, Hot Application Plate, Identification - Information and Markings Corrosion Preventive Compound, Solvent Cut
15、back, Cold Application Filter and Filter Element, Fluid Prgssure, Hydraulig, absolute, 25 Micron, -65 to +450 . and +600 F Coating, Nickel-Phosphorus, Electroless Nickel, Requirements for O O a MIL-T-10727 MIL-(2-11796 MIL-P-15024 MIL-C- 16 1 7 3 MIL-F-25682 MIL-C-26 07 4 3 Provided by IHSNot for Re
16、saleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-83282 MIGP-83461 STANDARDS MILITARY BOD-STD-100 MIL-STD- 129 MIL-STD-130 MIL-STD- 143 MIL-STD-27 6 MIL-STD-280 MIL-STD-78 1 MIL-STD-810 MIL-STD-889 MS3332 MS3335 MS 2 1 3 4 4 MS2 8 7 7 3 MS28 7 7 4 MS2 8 7 7 5 MS28 7 8 2
17、MS28783 MS33649 MIL-M-7997C Hydraulic Fluid, Fire Resistant Synthetic Hydrocarbon Base, Aircraft Packings, Preformed-Petroleum HydrauAic FluAd Resistant Improved Performance 275 F (135 C) Engineering Drawing Practices Marking for Shipment and Storage Identification Marking of U.S. Military Property
18、Specifications and Standards, Order of Precedence for the Selection of Impregnation of Porous Nonferrous Metal Castings Definitions of Item Levels, Item Exchangeability Models, and Related Terms Reliability Tests: Exponential Distribution Environmental Test Methods Dissimilar Metals Flange - Accesso
19、ry, 5,000 B.C. Round, Design Standard for Spline Details, Accessory Drives and Flanges Fitting, Installation of Flared Tube, Straight Threaded Connectors Design Standard for Retainer, Packing Backup, Tetrafluoroethylene, Thread Tube Fitting Boss Retainer, Packing Backup, Single Turn, Tetrafluoroethy
20、lene Packing, Preformed, Hydraulic Plus 275 Deg. F (O -Ring) Retainer, Packing, Backup, Teflon Ring, Gasket, Backup, Teflon Boss, Fluid Connection, Internal Straight Thread Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-7777C Lb W 7777706 Ol18
21、6370 2 W MIL-M-7997C AIR FORCE-NAVY AERONAUTICAL AND10260 AND10261 Flange, Type XI Accessory Mounting AND10262 Flange, Type XII Accessory Mounting (Copies of specifications, standards, handbooks, drawings, and Flange, Type X Accessory Mounting pub ications required by manufacturers in connection wit
22、h specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following document forms a part of this specification to the extent specified herein. which are indicated as DoD adopted shall be the issue listed
23、 in the current DoDISS and the supplement thereto, if applicable. The issues of the documents SOCIETY OF AUTOMOTIVE ENGINEERS AIR- 13 62 Physical Properties of Fluids (Application for copies of SAE publications should be addressed to the Society of Automotive Engineers, Inc., 400 Commonwealth Drive,
24、 Warrendale, PA 15096.) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. 3. REQUIREMENTS 3.1 First article/qualification. The motors furnished under this specification sha
25、ll be a product which has been tested and passed the first article or qualification as specified in the detail specification. 3.2 Precedence. The requirements of MIL-H-8775 or MIL-H-8890, as applicable apply as requirements of this specification with the exceptions and additions specified herein. In
26、 case of conflict between the requirements of this specification and the detail specification the requirements of the detail specification shall take precedence. 3.3 Selection of specifications and standards. Specifications and standards for necessary commodities and services not specified herein sh
27、all be selected in accordance with MIL-STD-143. 3.4 Materials, Materials used in the manufacture of hydraulic motors shall be of high quality, suitable for the purpose, and shall conform to the applicable Government specifications. Materials conforming to the motor manufacturers specifications may b
28、e used provided the specifications are acceptable to the procuring activity and contain provisions for adequate tests. not constitute waiver of other applicable specifications. The use of motor manufacturers specifications shall 5 Provided by IHSNot for ResaleNo reproduction or networking permitted
29、without license from IHS-,-,-304.1 Metals. All metals used in the construction of hydraulic motors, except those which are in constant contact with the hydraulic flu-id, shall be of a corrosion-resistant type or shall be suitably protected to resist corrosion. The use of dissimilar metals, especiall
30、y brass, copper, or steel in intimate metal-to-metal contact with aluminum alloy, shall be avoided wherever practicable. Dissimilar metals are defined in MIL-STD-889. 3,4.1.1 Typ e I system motors. Except for internal surfaces in constant contact with hydraulic fluid, ferrous alloys shall have a chr
31、omium content of not less than 12 percent or shall be suitably protected against corrosion as specified in 3.4,2.1. In addition, tin, cadmium and zinc platings shall not be used for internal parts or on internal surfaces in contact with hydraulic fluid or exposed to its vapors. ring grooves for exte
32、rnal seals shall not be considered as internal surfaces in constant contact with hydraulic f luid, be used. O- Magnesium shall not 3e4.1.2 Type II and type III system motors, Ferrous alloys shall have a chromium content of not less than 12 percent or shall be suitably protected against corrosion as
33、specified in 3.4.2.1. In addition, tin, cadmium and zinc platings shall not be used for internal parts or on internal surfaces in contact with hydraulic fluid or exposed to its vapors. Magnesium shall not be used. Where performance or reliability of the motor will be jeopardized by the use of materi
34、als and processes as specified in 3.4.1 and 3.4.2, alternate materials or peocesses may be used, subject to the approval of the procuring activity. Such materials or processes shall be selected so as to provide the maximum degree of corrosion resistance consistent with the performance requirements.
35、I 3,4.2 Corrosion protection. Metals which do not inherently possess adequate corrosion-resisting characteristics shall be suitably protected, in accordance with the following subparagraphs, to resist corrosion which may result from such conditions as dissimilar metal combinations, moisture, salt sp
36、ray, and high temperature deterioration as applicable. 3.4.2.1 Ferrous and copper alloys. Ferrous alloys requiring corrosion preventive treatment, and all copper alloys, except for parts having bearing surfaces, shall have a suitable electrodeposited metallic coating selected from Table I. used for
37、internal parts or on internal surfaces in contact with hydraulic fluid or exposed to its vapors and not where subject to abrasion, not indicated, class and type are at the option of the manufacturer. Cadmium and zinc plating shall not be Where TABLE I. Metallic coatings. Cadmium Plating Zinc Plating
38、 Chromium Plating Nickel Plating Silver Plating Tin Plating Electroless Nickel QQ-P-416, Type IL, Class 2 QQ-2-325, Type II, Class 2 QQ-C-320 QQ -N-2 90 QQ-S-365 MIL-C-26074 MIL-T-10727, Type I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-77
39、77C 36 7779706 0386372 6 mi MIL-FI-7 99 7 C Other metallic coatings, the use of which has been demonstrated to be satisfactory to the purchaser, such as electrodeposited 85 percent tin, 15 percent cadmium alloy may be used. 3.4.3 Anodizing. Unless otherwise authorized, all aluminum alloys shall be a
40、nodized in accordance with MIL-A-8625, except that in the absence of abrasive conditions they may be coated with chemical film in accordance with MIL-C-5541. approval of the procuring activity. The exceptions noted will be subject to the 3.4.4 Castings. Castings shall be of high quality, clean, soun
41、d, and free from cracks, blow holes, and excessive porosity and other defects. Defects not materially affecting the suitability of the castings may be repaired at the foundry or during machining by peening, impregnation, welding, or other methods acceptable to the procuring activity. Inspection and
42、repair of castings shall be governed by quality control techniques and standards satisfactory to the procuring activity. castings are used, they shall be in accordance with impregnation procedures and inspections requirements of MIL-STD-276. When impregnation 3.4.5 Seals. For Type I system motors, s
43、tatic and dynamic seals where practicable, shall be in accordance with MS28775. system motors, static and dynamic seals, where practicable, shall be in accordance with MIL-P-83461 (improved performance at +275OF). Back up seals shall be in accordance with MS28773, MS28774, MS28782, or MS28783. Nonst
44、andard seals necessary to demonstrate compliance with the requirements of this specification, may be used subject to the approval of the procuring activity. shall be subject to approval of the procuring activity. For Type II For Type III system motors, seals and back-up rings used 3.5 Design and con
45、struction. 3.5.1 Direction of rotation. Unless otherwise specified in the detail specification, the hydraulic motors shall operate satisfactorily in either direction of rotation. motor to effect a change in the direction of rotation, but merely to reverse the direction of flow. It shall not be neces
46、sary to alter the 3.5.2 Rated speed. The rated speed of a motor shall be the maximum The rated speed shall be speed at which the motor is designed to operate continuously at rated temperature and rated differential pressure. measured and stated as RPM of the motor output shaft and shall be specified
47、 in the detail specification. 3.5.2.1 verspeed. Motor performance and integrity shall not be impaired after driven at intermittent speeds up to 125 percent of rated RPM, for 30 minutes. 3.5.3 Shaft seal. The hydraulic motor shall be provided with a suitable seal for the motor shaft. be required for
48、operation in either direction of rotation. The shaft seal shall be capable of meeting the tests and environments specified in Section 4. No changes of the shaft seal shall 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5.4 Drains. The motor body
49、 shall be provided with case drain and seepage drain connections and plugs as specified in the detail specification. 3 5 . 5 Lubrication. The hydraulic motor shall be self -lubricating with no provision other than the circulating fluid. 3.5.6 Balance. inherently balanced, and the motor shall not emit abnormal vibrations under conditions of operation at all speeds up to, and including the maximum speed. conditions shall be as specified in th
