1、MIL-B-85598 31 9997706 0112153 9 K- OS -/x MIL-B-85598 4 January 1988 MILITARY .SPECIFICATION BEARINGS, ELASTOMERIC GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. . SCOPE .s 1.1 Scope. This specification defines the r
2、equirements for spherical, radial-journal, conical and thrust bearings which are of laminated elastomeric construction. ture spectrum within a maximum ambient temperature range of -65F to +160“F while reacting oscillating loads and motions. depending on usage: These bearings are for use in an enviro
3、nment having a tempera- distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-0-85548 31 U 747770b 03112154 O W MIL-B-85598 2, APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following s
4、pecifications and standards form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the
5、sol ici tation. SPECIFICATIONS FEDERAL P-D-680 TT-M-26 1 MILITARY MIL-P-116 MI L-B-197 Dry Cleaning solvent Methyl Ethyl Ketone, Technical Preservation, Methods of Bearings, Antifriction, Associated Parts and Subassemblies, Preparation for delivery of MIL-G-5572 MI L-H-5606 MI L-T-5624 MIL-L-7808 MI
6、 L-S-8879 MIL-L-23699 MIL-H-83282 MIL-C-87936 Gasoline, Aviation, Grades 80187, 100/130, 115/145 Hydraulic Fluid, Petroleum Base, Aircraft, Mi ss i 1 e, and Ordnance Turbine Fuel, Aviation, Grades JP-4 and JP-5 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, NATO Code Number 0-148 Screw Th
7、reads, Control 1 ed Radi us Root Wi th Increased Minor Diameter, General Specification for Lubricating Oil, Aircraft Turbine Engines, Synthetic Base Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Aircraft, NATO Code Number H-537 Cleaning Compounds, Aircraft Exterior Surface, Water Di 1
8、 utabl e 2 41 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-85578 31 W 7777906 OLLZL55 2 MI L-8-85598 STANDARDS MI L I TARY DOD-STD-100 Engineering Drawing Practices MI L-STD-105 Sampl i ng Procedures and Tab1 es for Inspection by Attribute
9、s MIL-STD-129 Marking for Shipment and Storage MIL-STD-810 MIL-STD-889 Envi ronmental Test Methods and Eng1 neeri ng Guidelines Di s s i mi 1 ar Me tal s ii Inspect i on, Magnet i c Part i cl e MIL-STD-1949 MIL-STD-6866 Inspection, Liquid Penetrant (Copies of specifications, standards, drawings and
10、pub1 ications required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting off i Cer. 1 specification to the extent specified herein. Unless otherwise specified, the issues of the documents which are DO
11、D adopted shall be those listed in the issue of the DODISS specified in the solicitation. Unless otherwise spec- ified, the issues of documents not listed in the DODISS shall be the issue.of the nongovernment documents which is current on the date of the solicitation. 2.2 Other publications. The fol
12、lowing documents form a part of this o Uniform Classification Committee Un i form Frei gh t C1 ass i fi cat i on Ru 1 es (Application for copies of the above publication should be addressed to the Uniform Classification Committee, 202 Chicago Union Station, Chicago, IL 60606. ) American National Sta
13、ndards Institute ANSI 846.1 Surface Texture (Surface Roughness, Waviness and Lay) (Copies of the above publication may be.obtained from the American National Standards Institute, 1430 Broadway, New York, NY 10018.) American Society for Testing Materials o F-25 Method for Sizing and Counting Airborne
14、 Particulate Contamination in Clean Rooms and Other Dust Controlled Area Designed for Electronic and Similar Appl i cations F-50 Practice for Continuous Sizing and Counting of Airborne Particles in,Dust Controlled Areas Using Instruments Based Upon Light Scattering Principles 3 Provided by IHSNot fo
15、r ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-B-85578 31 9999906 OLL215b MI L-8-85598 (Copies of the above publications may be obtained from the American Society for Testing Materials, 1916 Race Street, Philadelphia, PA 19103, (215) 299-5400 1 Nongovernment stand
16、ards and other publications are normally available from the organizations which prepare or which distribute the documents. documents also may be available in or through libraries or other informational servi ces. These 2.3 Order of precedence. In the event of a conflict between the text of this spec
17、ification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specification shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has
18、 been obtained. 3, REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall
19、 govern. 3.2 Qualification. Bearings furnished under this specification shall be products which are authorized by the Qualifying Activity for listing on the applicable Qualified Products List at the time set for opening of bids (see 4.3 and 6.3). 3.2.1 Product change. Written-approval from the quali
20、fying activity is required for any change in product design, materials, elastomer compounds, metal surface treatments prior to elastomer molding, or bonding related opera- tions. Resubmittal of bearings for qualification inspection may be required. 3.,2.2 Requirements for qualification approval. Qua
21、lification approval is The test conditions based on the satisfactory performance of test bearings to the requirements of this specification. Four test conditions have been established for evalua- tion of the elastomer/shim system used in these bearings. and bearing configurations are given in Table
22、V for two standard Type I blade retention bearings and two standard Type II control system bearings. To be listed on the Qualified Products List for all test conditions, the manufac- turer must demonstrate compl iance to the performance and environmental requirements specified in Tables I, V and VI.
23、 Satisfactorily demonstrating compliance to the requirements of test conditions 2 or 4 (Table V) shall also qualify the manufacturer for test conditions 1 or 3, respectively. configuration which meets the qualification approval criteria of this spec- ification shall secure qualification approval for
24、 all production bearings having that test condition number listed on the specification sheet or drawing. The manufacturer shall bear all costs associated with the design, manufacture and testing of the standard bearing configurations. A test 4 Provided by IHSNot for ResaleNo reproduction or networki
25、ng permitted without license from IHS-,-,-MIL-B-85598 Prior to initiating the evaluation tests, the manufacturer shall notify the qualifying agency (Naval Air Development Center) of the intention to submit for qualification approval. The letter of notification shall state the proposed date of initia
26、tion of the tests, and the test condition for which qualification approval is desired. Upon completion of the test program, the test data shall be reported in accordance with 3.2.5. (Note: Data generated during the development phase is not acceptable.) The report shall be sub- mitted to the Naval Ai
27、r Development Center (Code 60611, Warminster, PA 18974-5000. 3.2.2.1 Retention of qualification. To maintain status on a Qualified Products List (QPL), certification shall be submitted at two year intervals to indicate continued compliance with the requirements of this specification (see 4.3.1 1. 3.
28、2.3 Performance requirements for qualification test bearings. The bearings for qualification testing shall be standard blade reention bearings (Type I, Class C) designed for operation at 300 and 1500 CPM (see Figures 9 and 10) and standard control sysem bearings (Type II, Class E) also designed for
29、operation at 300 and 1500 CPM (see Figures 11 and 12). static spring rates shall be measured (see 4.7.3) and be as specified in Table V. 3.2.3.1 Sttic spring rates. The axial, radial, torsional and cocking 3.2.3.2 Low temperature spring rate characteristic. The shear stiff- ening factor (see 6.5.1)
30、shall be measured at -65F (-54C) and -45F (-43C) in accordance with 4.7.7.7 and be within the limits shown in Figure 8. 3.2.3.3 Static strength. The minimum axial or radial static strength of the bearings shall be measured (see 4.7.5) and not be less than specified in Table V. 3.2.3.3.1 Static stren
31、gth of Type I, Class C, 300 CPM test bearings. The static axial strength of the bearing shall be determined by applying a cocking angle of 17 degrees simultaneously with increasing axial load. The bearing shall meet an axial load of 73,000 pounds minimum without catastrophic failure (buckling). 3.2.
32、3.3.2 Droop stop test for Type I, Class C, 300 CPM test bearings. The bearing shall pass a droop stop test consisting of 3500 pounds axial tensile load combined simultaneously with 10,000 pounds radial load applied to the bearing without evidence of permanent damage to the bearing components. Each b
33、earing shall be tested up to the maximum loads for 8000 cycles with a minimum of 2800 cycles equally spaced throughout the endurance test (one cycle every 15 minutes) and the balance at the completion of the endurance test. 3.2.3.3.3 Radial static strength with axial load, Type I, Class C, 1500 CPM
34、test bearings. The bearing shall pass a radial static strength test by applying an axial load of 200 pounds simultaneously with 500 pounds radial load without evidence of permanent damage to the bearing components. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
35、e from IHS-,-,-MIL-B-85598 3-2.3.4 Endurance tests. The bearings shall be tested without failure as defined in Table IV (see 4.7.6) for 700 hours under the loads and motions speclfiedin Table V. If no failures occur, one bearing shall continue to be tested until failure or 2100 hours of total test t
36、ime has been obtained. 3.2.3.4.1 Start-stop cycles for Type I, Class C bearings. Each bearing shall be start-stop tested (see 4.7.6.1) up to the maximum loads specified in Table V for 8000 cycles with a minimum of 2800 cycles equally spaced through- out the endurance test (one cycle every 15 minutes
37、) and the balance at the completion of the endurance test. 3.2.3.4.2 Control check cycles for T.ype 11, Class E bearings. Each bearing shall be control check tested (see 4.7.6.2) at the motions specified in Table V for 8000 cycles with a minimum of 2800 cycles equally spaced throughout the endurance
38、 test (one cycle every 15 minutes) and the balance at the completion of the endurance test. bearing shall be subjected to the fol lowing environmental conditions: 3.2.4 Environmental requirements for qualification test bearings. A test a. Salt fog (see 4.7.7.2) b. Fungus (see 4.7.7.31 c. Ozone (see
39、4.7.7.4) d. Hydraulic fluid (see 4.7.7.5a) e. High temperature (see 4.7.7.6) After exposure to the environmental conditions, the bearing shall be endurance tested (see 4.7.6) for 700 hours under the loads and motions specified in Table V. 3.2.5 Requirements for recording design and test data. The te
40、st data shall be recorded and summarized in report form. accuracy of test data, the bearing supplier (or the testing laboratory) shall certify that the data presented is the performance data for all bearings tested and thatno data has been deleted. Any test malfunction resulting in an invalid test s
41、hall be noted in the report. A dated drawing completely describing the dimensions, heat treatment, surface finish and elastomer designation of the bearing shall be included. To insure statistical 3.3 First article. The first article shall be the first production lot consisting of complete bearings.
42、for first article inspection (see 4.4) and approval (see 6.4). Unless otherwise specified in the contract or order, first article shall not be required on subsequent production lots. ification sheet or drawing. the bearing manufacturer subject to the limitations of 3.2.1. The manufacturer shall furn
43、ish sample units 3.4. Materials. Materials shall be as specified on the applicable spec- Unspecified materials shall be at the option of 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-85598 31 W 9994906 OlL2L59 T MIL-B-85598 3.4.1 Elastomer
44、and nonmetallic materials. The elastomer used in the fabrication of the bearing shall be selected by the manufacturer and have been tested and approved in accordance with 4.7.7. Nonmetallic materials shall be resistant to all hydraulic fluids, lubricating oils and preservative compounds throughout t
45、emperature ranges specified herein. 3.4.2 Bonding, materials and processes. Procedures for bonding and molding of the bearing shall be determined by the manufacturer, subject to the requirements of this specification. 3.4.3 Corrosion resistance of metal parts. Metal parts shall have corrosion-resist
46、ant characteristics (or shall be suitably Drotected by coatings) to resist corrosion which may result from moisture, salt spray and/or high temperature. Dissimilar metals as defined in MIL-STD-889 which are in direct contact with each other shall be avoided. If unavoidable, such bi-metallic couples
47、shall be protected with appropriate plating or finishes, insulating tapes, sealants or other approved methods in accordance with MIL-STD-889. 3.5 Design and construction. The production bearing design and construction (e.q., dimensions, materials, finishes, heat treatment, etc.) shall be as specifie
48、d herein and in accordance with the applicable drawing. The detail mechanical design of the bearing including elastomeric edge contouring and the design of the rubberlshim package (alternating layers of rubber and metal) shall- be accomplished by the manufacturer, subject to the requirements of this
49、 specification and the applicable referenced specifications, publications and drawings. The requirements of this specification are detailed only to the, extent considered necessary to obtain the desired mechanical characteristics, performahce and permanency of the bearings. Upon acceptance of the first bearing by the procuring agency, the manufacturer shall make no change in materials, design, manufacture or process without written approval of the procurin
